/* EU Grade Test - Tyre Dispatch NZ Theme */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #22c55e;
    --primary-dark: #16a34a;
    --secondary: #3b82f6;
    --danger: #ef4444;
    --warning: #f59e0b;
    --dark: #0a0a0a;
    --dark-surface: #111111;
    --dark-card: #1a1a1a;
    --text: #ffffff;
    --text-muted: #a1a1aa;
    --border: #2a2a2a;

    /* Grade Colors */
    --grade-a: #22c55e;
    --grade-b: #84cc16;
    --grade-c: #facc15;
    --grade-d: #f97316;
    --grade-e: #ef4444;
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--dark);
    color: var(--text);
    min-height: 100vh;
    overflow: hidden;
}

/* Screens */
.screen {
    display: none;
    width: 100%;
    height: 100vh;
}

.screen.active {
    display: flex;
}

/* Main Menu */
#main-menu {
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 2rem;
    overflow-y: auto;
    background: linear-gradient(180deg, var(--dark) 0%, #0d1117 100%);
}

.menu-container {
    max-width: 600px;
    width: 100%;
}

/* Brand Header */
.brand-header {
    text-align: center;
    padding: 1rem;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.1) 0%, rgba(34, 197, 94, 0.05) 100%);
    border: 1px solid rgba(34, 197, 94, 0.3);
    border-radius: 12px;
}

.brand-logo {
    font-family: 'Orbitron', monospace;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 3px;
    text-shadow: 0 0 15px rgba(34, 197, 94, 0.5);
}

.brand-tagline {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
    letter-spacing: 1px;
}

.logo-section {
    text-align: center;
    margin-bottom: 2rem;
}

.game-title {
    font-family: 'Orbitron', monospace;
    font-size: 2rem;
    color: var(--primary);
    text-shadow: 0 0 20px rgba(34, 197, 94, 0.5);
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-muted);
    font-size: 1rem;
}

.creator-badge {
    font-size: 0.8rem;
    color: var(--secondary);
    margin-top: 0.5rem;
    opacity: 0.9;
}

.research-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1rem;
    padding: 0.75rem 1.5rem;
    font-family: 'Orbitron', monospace;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.2) 0%, rgba(34, 197, 94, 0.2) 100%);
    border: 2px solid var(--secondary);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.research-btn:hover {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.4) 0%, rgba(34, 197, 94, 0.4) 100%);
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(34, 197, 94, 0.3);
}

.research-btn:active {
    transform: translateY(0);
}

/* =====================================================
   ACCORDION SYSTEM FOR CONFIG SECTIONS
   ===================================================== */

.accordion-container {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* Accordion Section (collapsible panels) */
.accordion-section {
    background: var(--dark-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.accordion-section.primary-section {
    border: 2px solid var(--primary);
    box-shadow: 0 0 10px rgba(34, 197, 94, 0.2);
}

.accordion-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    cursor: pointer;
    background: var(--dark-surface);
    transition: background 0.2s ease;
    user-select: none;
}

.accordion-header:hover {
    background: rgba(255, 255, 255, 0.05);
}

.accordion-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.accordion-icon {
    font-size: 1.25rem;
}

.accordion-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.accordion-value {
    font-family: 'Orbitron', monospace;
    font-size: 0.85rem;
    color: var(--primary);
    background: rgba(34, 197, 94, 0.15);
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    margin-left: 0.5rem;
}

.accordion-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.accordion-arrow {
    color: var(--text-muted);
    transition: transform 0.3s ease;
    font-size: 0.75rem;
}

.accordion-header.open .accordion-arrow {
    transform: rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    padding: 0 1.25rem;
}

.accordion-content.open {
    max-height: 800px;
    padding: 1rem 1.25rem 1.25rem;
}

/* Mode Toggle Switch (Constant/Custom) */
.mode-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--dark);
    padding: 0.25rem;
    border-radius: 20px;
    border: 1px solid var(--border);
}

.mode-toggle-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 0.35rem 0.75rem;
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-muted);
}

.mode-toggle-label.active {
    background: var(--primary);
    color: var(--dark);
    font-weight: 600;
}

.mode-toggle-label:hover:not(.active) {
    color: var(--text);
}

/* Constant mode indicator */
.accordion-section.constant-mode .accordion-value {
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.1);
}

.accordion-section.constant-mode .accordion-content {
    max-height: 0 !important;
    padding: 0 1.25rem !important;
}

/* =====================================================
   SIMPLE COLLAPSIBLE SECTIONS
   ===================================================== */

.collapsible-section {
    transition: all 0.3s ease;
}

.collapsible-section h2 {
    cursor: pointer;
    transition: color 0.2s ease;
}

.collapsible-section h2:hover {
    color: var(--primary);
}

.collapsible-section .collapse-arrow {
    display: inline-block;
    transition: transform 0.3s ease;
    margin-left: 0.5rem;
    font-size: 0.7rem;
}

.section-value-badge {
    font-family: 'Orbitron', monospace;
    font-size: 0.75rem;
    color: var(--primary);
    background: rgba(34, 197, 94, 0.15);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    margin-left: 0.5rem;
    font-weight: 600;
}

.collapsible-section.collapsed .collapse-arrow {
    transform: rotate(-90deg);
}

.collapsible-section.collapsed > *:not(h2):not(.tooltip-popup) {
    max-height: 0 !important;
    opacity: 0;
    overflow: hidden;
    margin-top: 0 !important;
    margin-bottom: 0 !important;
    padding-top: 0 !important;
    padding-bottom: 0 !important;
    pointer-events: none;
}

.collapsible-section.collapsed {
    padding-bottom: 0.5rem;
}

.collapsible-section:not(.collapsed) > * {
    transition: max-height 0.3s ease, opacity 0.3s ease;
}

/* Selection Sections (legacy support, still used inside accordions) */
.selection-section {
    background: var(--dark-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.accordion-content .selection-section {
    background: transparent;
    border: none;
    padding: 0;
    margin-bottom: 0;
}

.selection-section h2 {
    font-size: 0.9rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1rem;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

/* Test Type Selector */
.test-type-selector {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.test-type-btn {
    background: var(--dark-surface);
    border: 2px solid var(--border);
    border-radius: 10px;
    padding: 1.5rem 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.test-type-btn:hover {
    border-color: var(--primary);
    background: rgba(34, 197, 94, 0.1);
}

.test-type-btn.active {
    border-color: var(--primary);
    background: rgba(34, 197, 94, 0.2);
    box-shadow: 0 0 15px rgba(34, 197, 94, 0.3);
}

.test-icon {
    font-size: 2rem;
}

.test-name {
    font-weight: 700;
    color: var(--text);
    font-size: 1rem;
}

.test-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Grade Selector */
.grade-selector {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.grade-btn {
    width: 70px;
    height: 80px;
    background: var(--dark-surface);
    border: 2px solid var(--border);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
}

.grade-btn:hover {
    transform: translateY(-2px);
}

.grade-letter {
    font-family: 'Orbitron', monospace;
    font-size: 1.75rem;
    font-weight: 700;
}

.grade-rating {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

/* Grade Colors */
.grade-btn[data-grade="A"] { border-color: var(--grade-a); }
.grade-btn[data-grade="A"] .grade-letter { color: var(--grade-a); }
.grade-btn[data-grade="A"].active { background: rgba(34, 197, 94, 0.2); box-shadow: 0 0 15px rgba(34, 197, 94, 0.4); }

.grade-btn[data-grade="B"] { border-color: var(--grade-b); }
.grade-btn[data-grade="B"] .grade-letter { color: var(--grade-b); }
.grade-btn[data-grade="B"].active { background: rgba(132, 204, 22, 0.2); box-shadow: 0 0 15px rgba(132, 204, 22, 0.4); }

.grade-btn[data-grade="C"] { border-color: var(--grade-c); }
.grade-btn[data-grade="C"] .grade-letter { color: var(--grade-c); }
.grade-btn[data-grade="C"].active { background: rgba(250, 204, 21, 0.2); box-shadow: 0 0 15px rgba(250, 204, 21, 0.4); }

.grade-btn[data-grade="D"] { border-color: var(--grade-d); }
.grade-btn[data-grade="D"] .grade-letter { color: var(--grade-d); }
.grade-btn[data-grade="D"].active { background: rgba(249, 115, 22, 0.2); box-shadow: 0 0 15px rgba(249, 115, 22, 0.4); }

.grade-btn[data-grade="E"] { border-color: var(--grade-e); }
.grade-btn[data-grade="E"] .grade-letter { color: var(--grade-e); }
.grade-btn[data-grade="E"].active { background: rgba(239, 68, 68, 0.2); box-shadow: 0 0 15px rgba(239, 68, 68, 0.4); }

/* Fuel Economy Grade Selector */
.fuel-grade-selector {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.fuel-grade-btn {
    width: 70px;
    height: 80px;
    background: var(--dark-surface);
    border: 2px solid var(--border);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
}

.fuel-grade-btn:hover {
    transform: translateY(-2px);
}

.fuel-grade-letter {
    font-family: 'Orbitron', monospace;
    font-size: 1.75rem;
    font-weight: 700;
}

.fuel-grade-rating {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

/* Fuel Grade Colors - Using blue tones for fuel economy */
.fuel-grade-btn[data-fuelgrade="A"] { border-color: #22c55e; }
.fuel-grade-btn[data-fuelgrade="A"] .fuel-grade-letter { color: #22c55e; }
.fuel-grade-btn[data-fuelgrade="A"].active { background: rgba(34, 197, 94, 0.2); box-shadow: 0 0 15px rgba(34, 197, 94, 0.4); }

.fuel-grade-btn[data-fuelgrade="B"] { border-color: #84cc16; }
.fuel-grade-btn[data-fuelgrade="B"] .fuel-grade-letter { color: #84cc16; }
.fuel-grade-btn[data-fuelgrade="B"].active { background: rgba(132, 204, 22, 0.2); box-shadow: 0 0 15px rgba(132, 204, 22, 0.4); }

.fuel-grade-btn[data-fuelgrade="C"] { border-color: #facc15; }
.fuel-grade-btn[data-fuelgrade="C"] .fuel-grade-letter { color: #facc15; }
.fuel-grade-btn[data-fuelgrade="C"].active { background: rgba(250, 204, 21, 0.2); box-shadow: 0 0 15px rgba(250, 204, 21, 0.4); }

.fuel-grade-btn[data-fuelgrade="D"] { border-color: #f97316; }
.fuel-grade-btn[data-fuelgrade="D"] .fuel-grade-letter { color: #f97316; }
.fuel-grade-btn[data-fuelgrade="D"].active { background: rgba(249, 115, 22, 0.2); box-shadow: 0 0 15px rgba(249, 115, 22, 0.4); }

.fuel-grade-btn[data-fuelgrade="E"] { border-color: #ef4444; }
.fuel-grade-btn[data-fuelgrade="E"] .fuel-grade-letter { color: #ef4444; }
.fuel-grade-btn[data-fuelgrade="E"].active { background: rgba(239, 68, 68, 0.2); box-shadow: 0 0 15px rgba(239, 68, 68, 0.4); }

/* Grade Info Panel */
.grade-info-panel {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--dark-surface);
    border-radius: 8px;
    border-left: 3px solid var(--primary);
}

.grade-info-panel h3 {
    font-size: 0.9rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.grade-info-panel p {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* Start Button */
.start-button {
    width: 100%;
    padding: 1.25rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border: none;
    border-radius: 10px;
    font-family: 'Orbitron', monospace;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--dark);
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.start-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(34, 197, 94, 0.4);
}

/* Branding */
.branding {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.branding strong {
    color: var(--primary);
}

/* Physics Badge */
.physics-badge {
    font-size: 0.7rem;
    color: var(--secondary);
    margin-top: 0.5rem;
    opacity: 0.8;
}

/* Tread Selector */
.tread-selector {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
}

.tread-btn {
    background: var(--dark-surface);
    border: 2px solid var(--border);
    border-radius: 10px;
    padding: 1rem 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.tread-btn:hover {
    border-color: var(--primary);
    background: rgba(34, 197, 94, 0.1);
}

.tread-btn.active {
    border-color: var(--primary);
    background: rgba(34, 197, 94, 0.2);
    box-shadow: 0 0 15px rgba(34, 197, 94, 0.3);
}

.tread-icon {
    font-size: 1.25rem;
}

.tread-label {
    font-size: 0.75rem;
    color: var(--text);
    font-weight: 600;
}

.tread-value {
    font-family: 'Orbitron', monospace;
    font-size: 0.9rem;
    color: var(--primary);
}

/* Weather Selector */
.weather-selector {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.5rem;
}

.weather-btn {
    background: var(--dark-surface);
    border: 2px solid var(--border);
    border-radius: 10px;
    padding: 0.75rem 0.25rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.weather-btn:hover {
    border-color: var(--secondary);
    background: rgba(59, 130, 246, 0.1);
}

.weather-btn.active {
    border-color: var(--secondary);
    background: rgba(59, 130, 246, 0.2);
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.3);
}

.weather-icon {
    font-size: 1.5rem;
}

.weather-label {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-align: center;
}

/* Custom Water Depth Control */
.custom-water-depth {
    margin-top: 1rem;
    padding: 1rem;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: 10px;
}

.water-depth-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.water-depth-header label {
    font-size: 0.9rem;
    color: var(--text);
    font-weight: 500;
}

.water-depth-value {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--secondary);
    background: var(--dark-surface);
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    min-width: 60px;
    text-align: center;
}

.water-depth-slider {
    width: 100%;
    height: 10px;
    -webkit-appearance: none;
    appearance: none;
    background: linear-gradient(to right,
        #f59e0b 0%,
        #3b82f6 20%,
        #6366f1 50%,
        #ef4444 100%
    );
    border-radius: 5px;
    outline: none;
    margin-bottom: 0.5rem;
}

.water-depth-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    background: white;
    border: 3px solid var(--secondary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.water-depth-slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
    background: white;
    border: 3px solid var(--secondary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.water-depth-scale {
    display: flex;
    justify-content: space-between;
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.water-depth-scale span {
    text-align: center;
}

.water-depth-scale small {
    display: block;
    color: var(--text-muted);
    opacity: 0.7;
}

.water-depth-disclaimer {
    font-size: 0.75rem;
    color: var(--text-muted);
    background: var(--dark-surface);
    padding: 0.75rem;
    border-radius: 6px;
    line-height: 1.5;
}

.water-depth-disclaimer strong {
    color: var(--warning);
}

.water-depth-disclaimer ul {
    margin: 0.5rem 0 0 1rem;
    padding: 0;
}

.water-depth-disclaimer li {
    margin-bottom: 0.25rem;
}

/* Age Slider */
.age-slider-container {
    padding: 0 0.5rem;
}

.age-slider {
    width: 100%;
    height: 8px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--dark-surface);
    border-radius: 4px;
    outline: none;
}

.age-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    background: var(--primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px rgba(34, 197, 94, 0.5);
}

.age-slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: var(--primary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 0 10px rgba(34, 197, 94, 0.5);
}

.age-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.age-labels span:nth-child(2) {
    font-weight: 700;
    color: var(--primary);
    font-family: 'Orbitron', monospace;
}

/* Config Info Panel */
.config-info-panel {
    background: var(--dark-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.25rem;
    margin-bottom: 1.5rem;
}

.config-info-panel h3 {
    font-size: 1rem;
    margin-bottom: 1rem;
    text-align: center;
}

.config-summary {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.config-item {
    text-align: center;
    padding: 0.5rem;
    background: var(--dark-surface);
    border-radius: 8px;
}

.config-label {
    display: block;
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 0.25rem;
}

.config-value {
    font-family: 'Orbitron', monospace;
    font-size: 1rem;
    font-weight: 700;
}

.preview-distance {
    text-align: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.preview-distance p {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.preview-value {
    font-family: 'Orbitron', monospace;
    font-size: 2rem;
    color: var(--primary);
    font-weight: 700;
}

.preview-diff {
    font-size: 0.8rem;
    color: var(--danger);
    margin-top: 0.5rem;
}

.preview-diff.best {
    color: var(--primary);
}

/* Game Screen */
#game-screen {
    flex-direction: column;
    background: var(--dark);
    position: relative;
}

#game-screen.active {
    display: flex !important;
}

/* Game HUD */
.game-hud {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: var(--dark-surface);
    border-bottom: 1px solid var(--border);
}

.hud-left, .hud-right {
    display: flex;
    gap: 2rem;
    align-items: center;
}

/* HUD Back Button */
.hud-back-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background: var(--dark-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.hud-back-btn:hover {
    background: var(--border);
    color: var(--text);
    border-color: var(--text-muted);
}

.hud-back-btn .back-arrow {
    font-size: 1.1rem;
}

.hud-back-btn .back-text {
    letter-spacing: 1px;
}

.hud-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hud-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.hud-value {
    font-family: 'Orbitron', monospace;
    font-size: 1.25rem;
    color: var(--primary);
    font-weight: 700;
}

/* Speedometer */
.speedometer {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: var(--dark-card);
    padding: 1rem 2rem;
    border-radius: 10px;
    border: 2px solid var(--primary);
    box-shadow: 0 0 20px rgba(34, 197, 94, 0.3);
}

.speed-value {
    font-family: 'Orbitron', monospace;
    font-size: 3rem;
    color: var(--primary);
    font-weight: 700;
    line-height: 1;
}

.speed-unit {
    font-size: 0.8rem;
    color: var(--text-muted);
    letter-spacing: 2px;
}

/* Game Area */
.game-area {
    flex: 1;
    position: relative;
    overflow: hidden;
    min-height: 400px;
    height: 55vh;
    max-height: 500px;
    background: #1a1a1a;
    cursor: pointer;
    touch-action: none;
    user-select: none;
}

#game-canvas {
    width: 100%;
    height: 100%;
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    object-fit: contain;
}

/* Instructions Overlay */
.instructions-overlay {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    z-index: 10;
}

.instruction-box {
    background: rgba(0, 0, 0, 0.9);
    padding: 1.5rem 2.5rem;
    border-radius: 12px;
    border: 1px solid var(--primary);
}

.instruction-box h3 {
    font-family: 'Orbitron', monospace;
    font-size: 1.5rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
    animation: pulse 1s infinite;
}

.instruction-box p {
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.key-hint {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    align-items: center;
}

.key {
    background: var(--dark-card);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    border: 1px solid var(--border);
    font-family: monospace;
    font-size: 0.9rem;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* Game Controls - Side by Side */
.game-controls {
    position: absolute;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 1.5rem;
    z-index: 10;
}

.control-button {
    border: none;
    border-radius: 15px;
    padding: 1.25rem 2rem;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    transition: all 0.2s ease;
    min-width: 140px;
}

.control-button:active {
    transform: scale(0.95);
}

/* Accelerate Button */
.accelerate-button {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    box-shadow: 0 0 15px rgba(34, 197, 94, 0.4);
}

.accelerate-button:hover {
    box-shadow: 0 0 25px rgba(34, 197, 94, 0.6);
}

.accelerate-button.active {
    background: linear-gradient(135deg, #16a34a 0%, #15803d 100%);
    box-shadow: 0 0 30px rgba(34, 197, 94, 0.8);
}

/* Brake Button */
.brake-button {
    background: linear-gradient(135deg, var(--danger) 0%, #dc2626 100%);
    box-shadow: 0 0 15px rgba(239, 68, 68, 0.4);
}

.brake-button:hover {
    box-shadow: 0 0 25px rgba(239, 68, 68, 0.6);
}

.control-icon {
    font-size: 1.75rem;
}

.control-text {
    font-family: 'Orbitron', monospace;
    font-size: 1rem;
    font-weight: 700;
    color: white;
    letter-spacing: 1px;
}

.control-hint {
    font-size: 0.65rem;
    color: rgba(255, 255, 255, 0.7);
}

/* Mobile responsive for game controls */
@media (max-width: 500px) {
    .game-controls {
        gap: 1rem;
    }

    .control-button {
        padding: 1rem 1.5rem;
        min-width: 120px;
    }

    .control-icon {
        font-size: 1.5rem;
    }

    .control-text {
        font-size: 0.85rem;
    }
}

/* Mobile responsive for GAME SCREEN - fit everything on one screen */
@media (max-width: 768px) {
    #game-screen {
        height: 100vh;
        height: 100dvh; /* Dynamic viewport height for mobile browsers */
        overflow: hidden;
    }

    .game-area {
        min-height: 250px;
        height: calc(100vh - 140px); /* Account for HUD + controls */
        height: calc(100dvh - 140px);
        max-height: none;
        flex: 1;
    }

    .game-controls {
        bottom: 1rem;
    }
}

@media (max-width: 500px) {
    #game-screen {
        height: 100vh;
        height: 100dvh;
    }

    .game-hud {
        padding: 0.5rem 0.75rem;
    }

    .hud-left, .hud-right {
        gap: 0.5rem;
    }

    .speedometer {
        padding: 0.5rem 1rem;
    }

    .speed-value {
        font-size: 1.5rem;
    }

    .speed-unit {
        font-size: 0.6rem;
    }

    .game-area {
        min-height: 200px;
        height: calc(100vh - 120px);
        height: calc(100dvh - 120px);
        max-height: none;
    }

    .game-controls {
        bottom: 0.75rem;
        gap: 0.75rem;
    }

    .control-button {
        padding: 0.75rem 1.25rem;
        min-width: 100px;
        border-radius: 12px;
    }

    .control-icon {
        font-size: 1.25rem;
    }

    .control-text {
        font-size: 0.75rem;
    }

    .control-hint {
        display: none; /* Hide keyboard hints on mobile */
    }
}

/* Extra small phones (iPhone SE, etc.) */
@media (max-width: 375px) {
    .game-hud {
        padding: 0.4rem 0.5rem;
    }

    .speedometer {
        padding: 0.4rem 0.75rem;
    }

    .speed-value {
        font-size: 1.25rem;
    }

    .game-area {
        min-height: 180px;
        height: calc(100vh - 100px);
        height: calc(100dvh - 100px);
    }

    .control-button {
        padding: 0.6rem 1rem;
        min-width: 85px;
    }

    .back-btn {
        padding: 0.4rem 0.75rem;
        font-size: 0.7rem;
    }
}

/* Landscape mobile - ensure everything fits */
@media (max-height: 500px) and (orientation: landscape) {
    .game-hud {
        padding: 0.25rem 1rem;
    }

    .speedometer {
        padding: 0.25rem 0.75rem;
    }

    .speed-value {
        font-size: 1.25rem;
    }

    .game-area {
        min-height: 150px;
        height: calc(100vh - 80px);
        height: calc(100dvh - 80px);
        max-height: none;
    }

    .game-controls {
        bottom: 0.5rem;
    }

    .control-button {
        padding: 0.5rem 1rem;
    }
}

/* Hidden */
.hidden {
    display: none !important;
}

/* Results Panel */
.results-panel {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--dark-card);
    border: 2px solid var(--primary);
    border-radius: 15px;
    padding: 2rem;
    max-width: 700px;
    width: 95%;
    max-height: 90vh;
    overflow-y: auto;
    z-index: 100;
    box-shadow: 0 0 50px rgba(34, 197, 94, 0.3);
}

.results-panel h2 {
    font-family: 'Orbitron', monospace;
    text-align: center;
    color: var(--primary);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.result-main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.your-result, .result-speed {
    background: var(--dark-surface);
    padding: 1rem;
    border-radius: 10px;
    text-align: center;
}

.result-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.result-value {
    font-family: 'Orbitron', monospace;
    font-size: 1.75rem;
    color: var(--primary);
    font-weight: 700;
}

/* Configuration Summary */
.config-summary-section {
    margin-bottom: 1.5rem;
}

.config-summary-section h3 {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.config-summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 0.5rem;
}

.config-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.5rem;
    background: var(--dark-surface);
    border-radius: 6px;
    text-align: center;
    border: 1px solid transparent;
}

.config-item.config-warning {
    border-color: #f59e0b;
    background: rgba(245, 158, 11, 0.1);
}

.config-item.config-danger {
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

.config-item.config-good {
    border-color: #22c55e;
    background: rgba(34, 197, 94, 0.1);
}

.config-icon {
    font-size: 1.2rem;
    margin-bottom: 0.25rem;
}

.config-label {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.config-value {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text);
}

.config-item.config-warning .config-value {
    color: #f59e0b;
}

.config-item.config-danger .config-value {
    color: #ef4444;
}

.config-item.config-good .config-value {
    color: #22c55e;
}

/* Cannot stop styling for comparison */
.comparison-row.cannot-stop {
    border: 1px solid #ef4444;
    background: rgba(239, 68, 68, 0.15);
}

.cannot-stop-bar {
    animation: pulse-danger 1s ease-in-out infinite;
}

@keyframes pulse-danger {
    0%, 100% { opacity: 0.7; }
    50% { opacity: 1; }
}

.comparison-row.extreme-distance {
    border: 1px solid #f59e0b;
    background: rgba(245, 158, 11, 0.1);
}

/* Extreme warning box */
.extreme-warning {
    border: 2px solid #ef4444;
    background: rgba(239, 68, 68, 0.1);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
}

.comparison-section {
    margin-bottom: 1.5rem;
}

.comparison-section h3 {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.grade-comparison {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.comparison-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem;
    background: var(--dark-surface);
    border-radius: 6px;
}

.comparison-row.current {
    border: 1px solid var(--primary);
    background: rgba(34, 197, 94, 0.1);
}

.comparison-grade {
    width: 35px;
    height: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    font-family: 'Orbitron', monospace;
    font-weight: 700;
    font-size: 1rem;
}

.comparison-grade.grade-A { background: var(--grade-a); color: var(--dark); }
.comparison-grade.grade-B { background: var(--grade-b); color: var(--dark); }
.comparison-grade.grade-C { background: var(--grade-c); color: var(--dark); }
.comparison-grade.grade-D { background: var(--grade-d); color: var(--dark); }
.comparison-grade.grade-E { background: var(--grade-e); color: white; }

.comparison-bar-container {
    flex: 1;
    height: 20px;
    background: var(--dark);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

.comparison-bar {
    height: 100%;
    border-radius: 4px;
    transition: width 0.5s ease;
}

.comparison-distance {
    font-family: 'Orbitron', monospace;
    font-size: 0.85rem;
    color: var(--text);
    min-width: 60px;
    text-align: right;
}

.comparison-diff {
    font-size: 0.75rem;
    color: var(--text-muted);
    min-width: 50px;
    text-align: right;
}

/* Insight Box */
.insight-box {
    background: var(--dark-surface);
    border-left: 3px solid var(--warning);
    padding: 1rem;
    border-radius: 0 8px 8px 0;
    margin-bottom: 1.5rem;
}

.insight-box p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.insight-box strong {
    color: var(--warning);
}

/* Result Buttons */
.results-buttons {
    display: flex;
    gap: 1rem;
}

.btn-retry, .btn-menu {
    flex: 1;
    padding: 1rem;
    border-radius: 8px;
    font-family: 'Orbitron', monospace;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-retry {
    background: var(--primary);
    border: none;
    color: var(--dark);
}

.btn-retry:hover {
    background: var(--primary-dark);
}

.btn-menu {
    background: transparent;
    border: 2px solid var(--border);
    color: var(--text);
}

.btn-menu:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    #main-menu {
        padding: 1rem;
    }

    .game-title {
        font-size: 1.5rem;
    }

    .test-type-selector {
        grid-template-columns: 1fr;
    }

    .grade-btn {
        width: 55px;
        height: 65px;
    }

    .grade-letter {
        font-size: 1.4rem;
    }

    .game-hud {
        padding: 0.75rem 1rem;
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .hud-left, .hud-right {
        gap: 1rem;
    }

    .speedometer {
        padding: 0.75rem 1.5rem;
    }

    .speed-value {
        font-size: 2rem;
    }

    .results-panel {
        padding: 1.5rem;
    }

    .result-main {
        grid-template-columns: 1fr;
    }

    .brake-button {
        padding: 1rem 2rem;
    }
}

/* Track Markers */
.track-marker {
    position: absolute;
    pointer-events: none;
}

/* =====================================================
   DETAILED STATS SECTION
   ===================================================== */

/* Speed Graph Section */
.speed-graph-section {
    margin-bottom: 1.5rem;
}

.speed-graph-section h3 {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.graph-container {
    background: var(--dark-surface);
    border-radius: 8px;
    padding: 0.5rem;
    overflow: hidden;
}

.graph-container canvas {
    width: 100%;
    height: 100px;
    display: block;
    border-radius: 4px;
}

/* Detailed Stats Section */
.detailed-stats-section {
    margin-bottom: 1.5rem;
}

.detailed-stats-section h3 {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Stats Narrative */
.stats-narrative {
    background: var(--dark-surface);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
    border-left: 3px solid var(--secondary);
}

.narrative-text {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 0.75rem;
}

.narrative-text:last-child {
    margin-bottom: 0;
}

.narrative-text strong {
    color: var(--secondary);
    font-weight: 600;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
}

/* Stat Cards */
.stat-card {
    background: var(--dark-surface);
    border-radius: 10px;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    border: 1px solid var(--border);
}

.stat-card.acceleration {
    border-top: 3px solid var(--secondary);
}

.stat-card.braking {
    border-top: 3px solid var(--danger);
}

.stat-card.total {
    border-top: 3px solid var(--primary);
}

.stat-icon {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
}

.stat-content {
    flex: 1;
}

.stat-title {
    display: block;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.5rem;
}

.stat-details {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.stat-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
}

.stat-row span {
    color: var(--text-muted);
}

.stat-row strong {
    color: var(--text);
    font-family: 'Orbitron', monospace;
    font-size: 0.8rem;
}

/* Mobile Responsive for Stats */
@media (max-width: 768px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .stat-card {
        flex-direction: row;
        align-items: flex-start;
        gap: 1rem;
    }

    .stat-icon {
        margin-bottom: 0;
    }

    .results-panel {
        padding: 1rem;
        max-height: 85vh;
    }

    .narrative-text {
        font-size: 0.85rem;
    }

    .stat-row {
        font-size: 0.7rem;
    }

    .stat-row strong {
        font-size: 0.75rem;
    }
}

@media (max-width: 500px) {
    .result-main {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .your-result, .result-speed {
        padding: 0.75rem;
    }

    .result-value {
        font-size: 1.5rem;
    }

    .stats-narrative {
        padding: 0.75rem;
    }

    .stat-card {
        padding: 0.75rem;
    }
}

/* =====================================================
   FACTOR BREAKDOWN SECTION
   ===================================================== */

.factor-breakdown-section {
    margin-bottom: 1.5rem;
}

.factor-breakdown-section h3 {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.factors-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.factor-card {
    background: var(--dark-surface);
    border-radius: 8px;
    padding: 0.75rem;
}

.factor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.factor-name {
    font-size: 0.8rem;
    color: var(--text);
    font-weight: 600;
}

.factor-value {
    font-family: 'Orbitron', monospace;
    font-size: 0.9rem;
    font-weight: 700;
}

.factor-bar {
    height: 6px;
    background: var(--dark);
    border-radius: 3px;
    overflow: hidden;
}

.factor-fill {
    height: 100%;
    border-radius: 3px;
    transition: width 0.5s ease;
}

.mu-display {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--dark-surface);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    border-left: 3px solid var(--secondary);
}

.mu-display span {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.mu-display strong {
    font-family: 'Orbitron', monospace;
    font-size: 1.25rem;
    color: var(--secondary);
}

/* Physics Warnings */
.physics-warnings {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.physics-warnings .warning {
    color: var(--danger);
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.insight-box .warning {
    color: var(--danger);
    font-weight: 600;
}

/* Mobile responsive for new elements */
@media (max-width: 768px) {
    .tread-selector {
        grid-template-columns: repeat(2, 1fr);
    }

    .weather-selector {
        grid-template-columns: repeat(3, 1fr);
    }

    .config-summary {
        grid-template-columns: repeat(3, 1fr);
    }

    .factors-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 500px) {
    .tread-selector {
        grid-template-columns: repeat(2, 1fr);
    }

    .weather-selector {
        grid-template-columns: repeat(3, 1fr);
    }

    .weather-btn {
        padding: 0.5rem 0.25rem;
    }

    .weather-icon {
        font-size: 1.25rem;
    }

    .weather-label {
        font-size: 0.6rem;
    }

    .config-summary {
        grid-template-columns: repeat(2, 1fr);
    }

    .preview-value {
        font-size: 1.5rem;
    }
}

/* =====================================================
   TUTORIAL OVERLAY
   ===================================================== */

.tutorial-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.tutorial-overlay.hidden {
    display: none;
}

.tutorial-content {
    background: var(--dark-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    max-width: 500px;
    width: 100%;
    padding: 2rem;
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tutorial-header {
    text-align: center;
    margin-bottom: 2rem;
}

.tutorial-header h2 {
    font-family: 'Orbitron', monospace;
    font-size: 1.5rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.tutorial-header p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.tutorial-steps {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.tutorial-step {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background: var(--dark-surface);
    border-radius: 10px;
    border: 1px solid var(--border);
    transition: all 0.3s ease;
}

.tutorial-step.active {
    border-color: var(--primary);
    background: rgba(34, 197, 94, 0.1);
}

.step-number {
    width: 32px;
    height: 32px;
    background: var(--primary);
    color: var(--dark);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
    color: var(--text);
}

.step-content p {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.step-content strong {
    color: var(--primary);
}

.tutorial-footer {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

.dont-show-again {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.dont-show-again input {
    width: 16px;
    height: 16px;
    accent-color: var(--primary);
}

.tutorial-btn {
    width: 100%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border: none;
    border-radius: 10px;
    padding: 1rem 2rem;
    font-family: 'Orbitron', monospace;
    font-size: 1rem;
    font-weight: 700;
    color: white;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 0 20px rgba(34, 197, 94, 0.3);
}

.tutorial-btn:hover {
    box-shadow: 0 0 30px rgba(34, 197, 94, 0.5);
    transform: translateY(-2px);
}

/* =====================================================
   INFO TOOLTIPS
   ===================================================== */

.info-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    background: var(--dark-surface);
    border: 1px solid var(--border);
    border-radius: 50%;
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 700;
    cursor: pointer;
    margin-left: 0.5rem;
    transition: all 0.2s ease;
    vertical-align: middle;
}

.info-btn:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--dark);
}

.tooltip-popup {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--dark-card);
    border: 1px solid var(--primary);
    border-radius: 12px;
    padding: 1.5rem;
    max-width: 400px;
    width: 90%;
    z-index: 1001;
    box-shadow: 0 0 30px rgba(34, 197, 94, 0.3);
    animation: fadeIn 0.2s ease-out;
}

.tooltip-popup.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translate(-50%, -50%) scale(0.95); }
    to { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}

.tooltip-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
}

.tooltip-content h4 {
    font-size: 1.1rem;
    color: var(--primary);
    margin-bottom: 0.75rem;
}

.tooltip-content p {
    font-size: 0.9rem;
    color: var(--text);
    line-height: 1.6;
    margin-bottom: 0.75rem;
}

.tooltip-content ul {
    list-style: none;
    margin-bottom: 0.75rem;
}

.tooltip-content li {
    font-size: 0.85rem;
    color: var(--text-muted);
    padding: 0.35rem 0;
    padding-left: 1rem;
    position: relative;
}

.tooltip-content li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary);
}

.tooltip-content li strong {
    color: var(--text);
}

.tooltip-source {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-style: italic;
    opacity: 0.7;
}

.tooltip-close {
    width: 100%;
    background: var(--dark-surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.75rem;
    color: var(--text);
    font-weight: 600;
    cursor: pointer;
    margin-top: 1rem;
    transition: all 0.2s ease;
}

.tooltip-close:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--dark);
}

/* =====================================================
   WHY THIS RESULT? DRAWER
   ===================================================== */

.why-drawer-section {
    margin-bottom: 1.5rem;
}

.why-drawer-toggle {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--dark-surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1rem 1.25rem;
    color: var(--secondary);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.why-drawer-toggle:hover {
    border-color: var(--secondary);
    background: rgba(59, 130, 246, 0.1);
}

.why-drawer-toggle.open {
    border-color: var(--secondary);
    border-radius: 10px 10px 0 0;
}

.why-arrow {
    transition: transform 0.3s ease;
}

.why-drawer-toggle.open .why-arrow {
    transform: rotate(180deg);
}

.why-drawer-content {
    background: var(--dark-card);
    border: 1px solid var(--secondary);
    border-top: none;
    border-radius: 0 0 10px 10px;
    padding: 1.25rem;
    animation: slideDown 0.3s ease-out;
}

.why-drawer-content.hidden {
    display: none;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.why-section-title {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.75rem;
    margin-top: 1rem;
}

.why-section-title:first-child {
    margin-top: 0;
}

.why-factor-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
    margin-bottom: 1rem;
}

.why-factor-table th {
    text-align: left;
    color: var(--text-muted);
    font-weight: 600;
    padding: 0.5rem;
    border-bottom: 1px solid var(--border);
}

.why-factor-table td {
    padding: 0.5rem;
    border-bottom: 1px solid var(--border);
}

.why-factor-table td:first-child {
    color: var(--text);
}

.why-factor-table td:nth-child(2) {
    font-family: 'Orbitron', monospace;
    color: var(--text);
}

.why-factor-table td:nth-child(3) {
    font-family: 'Orbitron', monospace;
}

.why-factor-table .factor-good {
    color: var(--primary);
}

.why-factor-table .factor-neutral {
    color: var(--text-muted);
}

.why-factor-table .factor-bad {
    color: var(--danger);
}

.why-formula-box {
    background: var(--dark-surface);
    border-radius: 8px;
    padding: 1rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--text-muted);
    overflow-x: auto;
}

.why-formula-box code {
    display: block;
    margin-bottom: 0.5rem;
}

.why-formula-box .formula-result {
    color: var(--secondary);
    font-weight: 600;
}

.why-mu-result {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--dark-surface);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    border-left: 3px solid var(--secondary);
    margin-top: 0.5rem;
}

.why-mu-result span {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.why-mu-result strong {
    font-family: 'Orbitron', monospace;
    font-size: 1.1rem;
    color: var(--secondary);
}

/* =====================================================
   TYRE TYPE SELECTOR
   ===================================================== */

.tyretype-selector {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
}

.tyretype-btn {
    background: var(--dark-surface);
    border: 2px solid var(--border);
    border-radius: 10px;
    padding: 1rem 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.tyretype-btn:hover {
    border-color: var(--secondary);
    background: rgba(59, 130, 246, 0.1);
}

.tyretype-btn.active {
    border-color: var(--secondary);
    background: rgba(59, 130, 246, 0.2);
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.3);
}

.tyretype-icon {
    font-size: 1.5rem;
}

.tyretype-label {
    font-size: 0.85rem;
    color: var(--text);
    font-weight: 600;
}

/* =====================================================
   PRESSURE SLIDER
   ===================================================== */

.pressure-slider-container {
    padding: 0 0.5rem;
}

.pressure-slider {
    width: 100%;
    height: 8px;
    -webkit-appearance: none;
    appearance: none;
    background: linear-gradient(to right,
        var(--danger) 0%,
        var(--danger) 20%,
        var(--warning) 20%,
        var(--warning) 35%,
        var(--primary) 35%,
        var(--primary) 55%,
        var(--warning) 55%,
        var(--warning) 75%,
        var(--danger) 75%,
        var(--danger) 100%
    );
    border-radius: 4px;
    outline: none;
}

.pressure-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    background: white;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
    border: 3px solid var(--primary);
}

.pressure-slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: white;
    border-radius: 50%;
    cursor: pointer;
    border: 3px solid var(--primary);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.pressure-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.pressure-labels span:nth-child(2) {
    font-weight: 700;
    font-family: 'Orbitron', monospace;
}

#pressure-value.pressure-optimal {
    color: var(--primary);
}

#pressure-value.pressure-warning {
    color: var(--warning);
}

#pressure-value.pressure-danger {
    color: var(--danger);
}

.pressure-warning {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.75rem;
    padding: 0.5rem 0.75rem;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--danger);
    border-radius: 8px;
    font-size: 0.8rem;
    color: var(--danger);
}

.pressure-warning.hidden {
    display: none;
}

.pressure-warning .warning-icon {
    font-size: 1rem;
}

/* =====================================================
   RANGE DISPLAY (Results)
   ===================================================== */

.range-display-section {
    background: var(--dark-surface);
    border-radius: 12px;
    padding: 1.25rem;
    margin-bottom: 1.5rem;
}

.range-display-section h3 {
    font-size: 0.9rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1rem;
    text-align: center;
}

.range-bar-container {
    margin-bottom: 1rem;
}

.range-bar {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 0.5rem;
    position: relative;
}

.range-best, .range-worst {
    text-align: center;
}

.range-best .range-label,
.range-worst .range-label {
    display: block;
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.range-best .range-value {
    font-family: 'Orbitron', monospace;
    font-size: 0.9rem;
    color: var(--primary);
    font-weight: 700;
}

.range-worst .range-value {
    font-family: 'Orbitron', monospace;
    font-size: 0.9rem;
    color: var(--danger);
    font-weight: 700;
}

.range-you {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
}

.range-indicator {
    display: inline-block;
    background: var(--secondary);
    color: white;
    font-size: 0.65rem;
    font-weight: 700;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    letter-spacing: 1px;
}

.range-scale {
    height: 12px;
    background: linear-gradient(to right, var(--primary), var(--warning), var(--danger));
    border-radius: 6px;
    position: relative;
    overflow: visible;
}

.range-fill {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 6px 0 0 6px;
    transition: width 0.5s ease;
}

.range-you-position {
    position: absolute;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    background: white;
    border: 3px solid var(--secondary);
    border-radius: 50%;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    transition: left 0.5s ease;
}

.range-you-position::after {
    content: '';
    position: absolute;
    top: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-top: 6px solid var(--secondary);
}

.range-summary {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text);
    margin: 0;
}

.range-summary strong {
    color: var(--secondary);
}

/* =====================================================
   TYRE WIDTH SELECTOR
   ===================================================== */

.width-selector {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
}

.width-btn {
    background: var(--dark-surface);
    border: 2px solid var(--border);
    border-radius: 10px;
    padding: 0.75rem 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.width-btn:hover {
    border-color: var(--primary);
    background: rgba(34, 197, 94, 0.1);
}

.width-btn.active {
    border-color: var(--primary);
    background: rgba(34, 197, 94, 0.2);
    box-shadow: 0 0 15px rgba(34, 197, 94, 0.3);
}

.width-value {
    font-family: 'Orbitron', monospace;
    font-size: 0.9rem;
    color: var(--primary);
    font-weight: 700;
}

.width-label {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* =====================================================
   SURFACE SELECTOR
   ===================================================== */

.surface-selector {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.5rem;
}

.surface-btn {
    background: var(--dark-surface);
    border: 2px solid var(--border);
    border-radius: 10px;
    padding: 0.75rem 0.25rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.surface-btn:hover {
    border-color: var(--warning);
    background: rgba(245, 158, 11, 0.1);
}

.surface-btn.active {
    border-color: var(--warning);
    background: rgba(245, 158, 11, 0.2);
    box-shadow: 0 0 15px rgba(245, 158, 11, 0.3);
}

.surface-btn[data-surface="ICE"].active {
    border-color: #60a5fa;
    background: rgba(96, 165, 250, 0.2);
    box-shadow: 0 0 15px rgba(96, 165, 250, 0.3);
}

.surface-icon {
    font-size: 1.5rem;
}

.surface-label {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-align: center;
}

/* =====================================================
   VEHICLE SELECTOR
   ===================================================== */

.vehicle-selector {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
}

.vehicle-btn {
    background: var(--dark-surface);
    border: 2px solid var(--border);
    border-radius: 10px;
    padding: 0.75rem 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.vehicle-btn:hover {
    border-color: var(--secondary);
    background: rgba(59, 130, 246, 0.1);
}

.vehicle-btn.active {
    border-color: var(--secondary);
    background: rgba(59, 130, 246, 0.2);
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.3);
}

.vehicle-icon {
    font-size: 1.75rem;
}

.vehicle-label {
    font-size: 0.75rem;
    color: var(--text);
    font-weight: 600;
}

.vehicle-weight {
    font-size: 0.65rem;
    color: var(--text-muted);
}

/* =====================================================
   TEMPERATURE SLIDER
   ===================================================== */

.temp-slider-container {
    padding: 0 0.5rem;
}

.temp-slider {
    width: 100%;
    height: 8px;
    -webkit-appearance: none;
    appearance: none;
    background: linear-gradient(to right,
        #60a5fa 0%,
        #60a5fa 20%,
        var(--primary) 20%,
        var(--primary) 65%,
        var(--warning) 65%,
        var(--warning) 80%,
        var(--danger) 80%,
        var(--danger) 100%
    );
    border-radius: 4px;
    outline: none;
}

.temp-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    background: white;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
    border: 3px solid var(--primary);
}

.temp-slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: white;
    border-radius: 50%;
    cursor: pointer;
    border: 3px solid var(--primary);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.temp-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.temp-labels span:nth-child(2) {
    font-weight: 700;
    font-family: 'Orbitron', monospace;
}

#temp-value.temp-optimal {
    color: var(--primary);
}

#temp-value.temp-cold {
    color: #60a5fa;
}

#temp-value.temp-hot {
    color: var(--danger);
}

.temp-warning {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.75rem;
    padding: 0.5rem 0.75rem;
    background: rgba(96, 165, 250, 0.1);
    border: 1px solid #60a5fa;
    border-radius: 8px;
    font-size: 0.8rem;
    color: #60a5fa;
}

.temp-warning.hot {
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--danger);
    color: var(--danger);
}

.temp-warning.hidden {
    display: none;
}

.temp-warning .warning-icon {
    font-size: 1rem;
}

/* =====================================================
   ABS TOGGLE
   ===================================================== */

.abs-toggle-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.abs-btn {
    background: var(--dark-surface);
    border: 2px solid var(--border);
    border-radius: 10px;
    padding: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.abs-btn:hover {
    border-color: var(--primary);
    background: rgba(34, 197, 94, 0.1);
}

.abs-btn.active[data-abs="true"] {
    border-color: var(--primary);
    background: rgba(34, 197, 94, 0.2);
    box-shadow: 0 0 15px rgba(34, 197, 94, 0.3);
}

.abs-btn.active[data-abs="false"] {
    border-color: var(--danger);
    background: rgba(239, 68, 68, 0.2);
    box-shadow: 0 0 15px rgba(239, 68, 68, 0.3);
}

.abs-icon {
    font-size: 1.25rem;
    font-weight: 700;
}

.abs-btn[data-abs="true"] .abs-icon {
    color: var(--primary);
}

.abs-btn[data-abs="false"] .abs-icon {
    color: var(--danger);
}

.abs-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
}

/* =====================================================
   HUD BRAKING DISTANCE
   ===================================================== */

.hud-braking {
    border-left: 2px solid var(--danger);
    padding-left: 1rem;
    margin-left: 0.5rem;
}

.hud-brake-value {
    color: var(--danger) !important;
}

/* Mobile responsive for new elements */
@media (max-width: 768px) {
    .width-selector {
        grid-template-columns: repeat(2, 1fr);
    }

    .surface-selector {
        grid-template-columns: repeat(3, 1fr);
    }

    .vehicle-selector {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 500px) {
    .tyretype-selector {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.5rem;
    }

    .tyretype-btn {
        padding: 0.75rem 0.25rem;
    }

    .tyretype-icon {
        font-size: 1.25rem;
    }

    .tyretype-label {
        font-size: 0.75rem;
    }

    .range-best .range-value,
    .range-worst .range-value {
        font-size: 0.8rem;
    }

    .width-selector {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }

    .surface-selector {
        grid-template-columns: repeat(3, 1fr);
    }

    .surface-btn {
        padding: 0.5rem 0.25rem;
    }

    .surface-icon {
        font-size: 1.25rem;
    }

    .vehicle-selector {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }

    .vehicle-icon {
        font-size: 1.5rem;
    }

    .abs-toggle-container {
        gap: 0.75rem;
    }

    .abs-btn {
        padding: 0.75rem;
    }
}

/* =====================================================
   EU LABEL IMAGE PREVIEW IN TOOLTIP
   ===================================================== */

.eu-label-preview {
    margin: 1rem 0;
    background: var(--dark-surface);
    border-radius: 8px;
    padding: 0.75rem;
    position: relative;
}

.eu-label-image {
    width: 100%;
    max-width: 300px;
    display: block;
    margin: 0 auto 1rem;
    border-radius: 6px;
    border: 1px solid var(--border);
}

.label-callouts {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.label-callouts .callout {
    font-size: 0.75rem;
    color: var(--text-muted);
    padding: 0.25rem 0.5rem;
    background: var(--dark);
    border-radius: 4px;
}

.label-callouts .callout-2 {
    background: rgba(34, 197, 94, 0.2);
    border-left: 3px solid var(--primary);
    color: var(--text);
}

/* How to Check Section in Tooltip */
.how-to-check {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.how-to-check h5 {
    color: var(--secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.how-to-check ol {
    list-style: decimal;
    margin-left: 1.25rem;
    margin-bottom: 0.5rem;
}

.how-to-check li {
    padding-left: 0.25rem !important;
    margin-bottom: 0.5rem;
}

/* NZ Context Section */
.nz-context {
    margin-top: 1rem;
    padding: 0.75rem;
    background: rgba(59, 130, 246, 0.1);
    border-radius: 8px;
    border-left: 3px solid var(--secondary);
}

.nz-context h5 {
    color: var(--secondary);
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.nz-context p {
    font-size: 0.8rem;
    margin-bottom: 0.5rem;
}

.nz-context .tip {
    font-style: italic;
    color: var(--text-muted);
}

/* Imperial Conversion Table */
.imperial-conversion {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.imperial-conversion h5 {
    color: var(--secondary);
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.conversion-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8rem;
    margin: 0.5rem 0;
}

.conversion-table th,
.conversion-table td {
    padding: 0.35rem 0.5rem;
    text-align: center;
    border: 1px solid var(--border);
}

.conversion-table th {
    background: var(--dark-surface);
    color: var(--text);
}

.conversion-table td {
    color: var(--text-muted);
}

.formula {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--secondary);
    margin-top: 0.5rem;
}

/* =====================================================
   WIDTH SLIDER STYLES
   ===================================================== */

.width-slider-container {
    padding: 0 0.5rem;
}

.unit-toggle {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.unit-btn {
    background: var(--dark-surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.5rem 1rem;
    color: var(--text-muted);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.unit-btn:hover {
    border-color: var(--primary);
    color: var(--text);
}

.unit-btn.active {
    background: rgba(34, 197, 94, 0.2);
    border-color: var(--primary);
    color: var(--primary);
}

.width-slider {
    width: 100%;
    height: 8px;
    -webkit-appearance: none;
    appearance: none;
    background: linear-gradient(to right,
        var(--secondary) 0%,
        var(--secondary) 30%,
        var(--primary) 30%,
        var(--primary) 60%,
        var(--warning) 60%,
        var(--warning) 100%
    );
    border-radius: 4px;
    outline: none;
}

.width-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    background: white;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
    border: 3px solid var(--primary);
}

.width-slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: white;
    border-radius: 50%;
    cursor: pointer;
    border: 3px solid var(--primary);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.width-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.width-labels span:nth-child(2) {
    font-weight: 700;
    font-family: 'Orbitron', monospace;
    color: var(--primary);
}

.width-category {
    text-align: center;
    margin-top: 0.75rem;
    padding: 0.5rem;
    background: var(--dark-surface);
    border-radius: 6px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* =====================================================
   TYRE SIZE INPUT
   ===================================================== */

.tyre-size-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.tyre-size-input-row {
    display: flex;
    gap: 0.5rem;
}

.tyre-size-input {
    flex: 1;
    background: var(--dark-surface);
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    font-family: 'Orbitron', monospace;
    color: var(--text);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.tyre-size-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 10px rgba(34, 197, 94, 0.3);
}

.tyre-size-input::placeholder {
    color: var(--text-muted);
    font-family: 'Inter', sans-serif;
    text-transform: none;
    letter-spacing: normal;
}

.parse-size-btn {
    background: var(--primary);
    color: var(--dark);
    border: none;
    border-radius: 8px;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.parse-size-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.tyre-size-parsed {
    display: flex;
    justify-content: center;
    gap: 2rem;
    padding: 1rem;
    background: var(--dark-surface);
    border-radius: 8px;
    border: 1px solid var(--border);
}

.parsed-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.parsed-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.parsed-value {
    font-family: 'Orbitron', monospace;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
}

.tyre-size-error {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--danger);
    border-radius: 6px;
    color: var(--danger);
    font-size: 0.85rem;
}

.tyre-size-error.hidden {
    display: none;
}

.quick-sizes {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
}

.quick-label {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.quick-size-btn {
    background: var(--dark-surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.35rem 0.6rem;
    font-size: 0.75rem;
    font-family: 'Orbitron', monospace;
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s ease;
}

.quick-size-btn:hover {
    border-color: var(--primary);
    background: rgba(34, 197, 94, 0.1);
}

/* =====================================================
   SURFACE SELECTOR GRID (3x3)
   ===================================================== */

.surface-selector-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
}

.surface-selector-grid .surface-btn {
    background: var(--dark-surface);
    border: 2px solid var(--border);
    border-radius: 10px;
    padding: 0.75rem 0.25rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.surface-selector-grid .surface-btn:hover {
    border-color: var(--warning);
    background: rgba(245, 158, 11, 0.1);
}

.surface-selector-grid .surface-btn.active {
    border-color: var(--warning);
    background: rgba(245, 158, 11, 0.2);
    box-shadow: 0 0 15px rgba(245, 158, 11, 0.3);
}

.surface-selector-grid .surface-btn[data-surface="ICE"].active,
.surface-selector-grid .surface-btn[data-surface="SNOW"].active {
    border-color: #60a5fa;
    background: rgba(96, 165, 250, 0.2);
    box-shadow: 0 0 15px rgba(96, 165, 250, 0.3);
}

.surface-selector-grid .surface-btn[data-surface="GRASS"].active {
    border-color: var(--primary);
    background: rgba(34, 197, 94, 0.2);
    box-shadow: 0 0 15px rgba(34, 197, 94, 0.3);
}

/* =====================================================
   TERRAIN CATEGORY SELECTOR
   ===================================================== */

.terrain-selector-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
}

.terrain-btn {
    background: var(--dark-surface);
    border: 2px solid var(--border);
    border-radius: 10px;
    padding: 0.75rem 0.25rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.terrain-btn:hover {
    border-color: var(--secondary);
    background: rgba(59, 130, 246, 0.1);
}

.terrain-btn.active {
    border-color: var(--secondary);
    background: rgba(59, 130, 246, 0.2);
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.3);
}

/* Special styling for off-road terrain types */
.terrain-btn[data-terrain="AT"].active,
.terrain-btn[data-terrain="MT"].active,
.terrain-btn[data-terrain="RT"].active {
    border-color: var(--warning);
    background: rgba(245, 158, 11, 0.2);
    box-shadow: 0 0 15px rgba(245, 158, 11, 0.3);
}

/* Special styling for performance terrain types */
.terrain-btn[data-terrain="HP"].active,
.terrain-btn[data-terrain="UHP"].active {
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.2);
    box-shadow: 0 0 15px rgba(239, 68, 68, 0.3);
}

.terrain-icon {
    font-size: 1.5rem;
}

.terrain-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-align: center;
}

.terrain-btn.active .terrain-label {
    color: var(--text);
}

/* =====================================================
   PATTERN DIRECTION SELECTOR
   ===================================================== */

.pattern-selector {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
}

.pattern-btn {
    background: var(--dark-surface);
    border: 2px solid var(--border);
    border-radius: 10px;
    padding: 0.75rem 0.25rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.pattern-btn:hover {
    border-color: #a855f7;
    background: rgba(168, 85, 247, 0.1);
}

.pattern-btn.active {
    border-color: #a855f7;
    background: rgba(168, 85, 247, 0.2);
    box-shadow: 0 0 15px rgba(168, 85, 247, 0.3);
}

/* Special styling for directional patterns (water evacuation) */
.pattern-btn[data-pattern="DIRECTIONAL"].active {
    border-color: #3b82f6;
    background: rgba(59, 130, 246, 0.2);
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.3);
}

/* Special styling for performance asymmetrical patterns */
.pattern-btn[data-pattern="ASYMMETRICAL_DIRECTIONAL"].active {
    border-color: #f59e0b;
    background: rgba(245, 158, 11, 0.2);
    box-shadow: 0 0 15px rgba(245, 158, 11, 0.3);
}

.pattern-icon {
    font-size: 1.5rem;
}

.pattern-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-align: center;
}

.pattern-btn.active .pattern-label {
    color: var(--text);
}

/* Responsive adjustments for terrain and pattern selectors */
@media (max-width: 768px) {
    .terrain-selector-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 0.35rem;
    }

    .pattern-selector {
        grid-template-columns: repeat(4, 1fr);
        gap: 0.35rem;
    }

    .terrain-btn,
    .pattern-btn {
        padding: 0.5rem 0.15rem;
    }

    .terrain-icon,
    .pattern-icon {
        font-size: 1.25rem;
    }

    .terrain-label,
    .pattern-label {
        font-size: 0.6rem;
    }
}

@media (max-width: 500px) {
    .terrain-selector-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .pattern-selector {
        grid-template-columns: repeat(2, 1fr);
    }

    .terrain-btn,
    .pattern-btn {
        padding: 0.4rem 0.1rem;
    }

    .terrain-icon,
    .pattern-icon {
        font-size: 1rem;
    }

    .terrain-label,
    .pattern-label {
        font-size: 0.55rem;
    }
}

/* =====================================================
   WEIGHT INPUT STYLES
   ===================================================== */

.weight-input-container {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.weight-input-container label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.weight-input-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.weight-input {
    flex: 1;
    background: var(--dark-surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.75rem 1rem;
    color: var(--text);
    font-family: 'Orbitron', monospace;
    font-size: 1rem;
    max-width: 150px;
}

.weight-input:focus {
    outline: none;
    border-color: var(--primary);
}

.weight-unit {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* =====================================================
   TRAILER SECTION STYLES
   ===================================================== */

.trailer-section {
    border-color: var(--secondary);
}

.trailer-toggle {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
}

.trailer-btn {
    background: var(--dark-surface);
    border: 2px solid var(--border);
    border-radius: 10px;
    padding: 0.75rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.trailer-btn:hover {
    border-color: var(--secondary);
    background: rgba(59, 130, 246, 0.1);
}

.trailer-btn.active {
    border-color: var(--secondary);
    background: rgba(59, 130, 246, 0.2);
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.3);
}

.trailer-icon {
    font-size: 1.25rem;
}

.trailer-label {
    font-size: 0.75rem;
    color: var(--text);
    font-weight: 600;
}

.trailer-config {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--dark-surface);
    border-radius: 8px;
    border-left: 3px solid var(--secondary);
}

.trailer-config.hidden {
    display: none;
}

.trailer-weight-row {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.trailer-weight-row label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* =====================================================
   WIND CONTROLS STYLES
   ===================================================== */

.wind-controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.wind-speed-container {
    padding: 0 0.5rem;
}

.wind-speed-container label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.wind-slider {
    width: 100%;
    height: 8px;
    -webkit-appearance: none;
    appearance: none;
    background: linear-gradient(to right,
        var(--primary) 0%,
        var(--primary) 15%,
        var(--secondary) 15%,
        var(--secondary) 40%,
        var(--warning) 40%,
        var(--warning) 70%,
        var(--danger) 70%,
        var(--danger) 100%
    );
    border-radius: 4px;
    outline: none;
}

.wind-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    background: white;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
    border: 3px solid var(--secondary);
}

.wind-slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: white;
    border-radius: 50%;
    cursor: pointer;
    border: 3px solid var(--secondary);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.wind-speed-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.wind-speed-labels span:nth-child(2) {
    font-weight: 700;
    font-family: 'Orbitron', monospace;
    color: var(--secondary);
}

.wind-direction-container {
    padding: 0 0.5rem;
}

.wind-direction-container label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.wind-direction-selector {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
}

.wind-dir-btn {
    background: var(--dark-surface);
    border: 2px solid var(--border);
    border-radius: 10px;
    padding: 0.75rem 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.wind-dir-btn:hover {
    border-color: var(--secondary);
    background: rgba(59, 130, 246, 0.1);
}

.wind-dir-btn.active {
    border-color: var(--secondary);
    background: rgba(59, 130, 246, 0.2);
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.3);
}

.wind-arrow {
    font-size: 1.25rem;
}

.wind-dir-btn span {
    font-size: 0.75rem;
    color: var(--text);
    font-weight: 600;
}

.wind-effect {
    font-size: 0.65rem !important;
    color: var(--text-muted) !important;
    font-weight: 400 !important;
}

/* =====================================================
   MOBILE RESPONSIVE FOR NEW ELEMENTS
   ===================================================== */

@media (max-width: 768px) {
    .surface-selector-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .trailer-toggle {
        grid-template-columns: repeat(3, 1fr);
    }

    .wind-direction-selector {
        grid-template-columns: repeat(3, 1fr);
    }

    .unit-toggle {
        flex-wrap: wrap;
    }
}

@media (max-width: 500px) {
    .surface-selector-grid {
        gap: 0.35rem;
    }

    .surface-selector-grid .surface-btn {
        padding: 0.5rem 0.25rem;
    }

    .surface-selector-grid .surface-icon {
        font-size: 1.25rem;
    }

    .surface-selector-grid .surface-label {
        font-size: 0.6rem;
    }

    .trailer-toggle {
        gap: 0.5rem;
    }

    .trailer-btn {
        padding: 0.5rem;
    }

    .wind-direction-selector {
        gap: 0.35rem;
    }

    .wind-dir-btn {
        padding: 0.5rem 0.25rem;
    }

    .wind-arrow {
        font-size: 1rem;
    }

    .wind-dir-btn span {
        font-size: 0.65rem;
    }

    .wind-effect {
        display: none;
    }

    .eu-label-image {
        max-width: 100%;
    }

    .label-callouts .callout {
        font-size: 0.65rem;
    }
}

/* =====================================================
   ROAD SLOPE/GRADIENT CONTROLS
   ===================================================== */

.slope-slider-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.slope-visual {
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--dark-surface);
    border-radius: 10px;
    overflow: hidden;
    position: relative;
}

.slope-indicator {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease;
}

.slope-car {
    font-size: 2rem;
    position: relative;
    z-index: 2;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.5));
}

.slope-line {
    position: absolute;
    width: 80%;
    height: 4px;
    background: linear-gradient(90deg, #666, #888, #666);
    border-radius: 2px;
    z-index: 1;
}

.slope-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 12px;
    border-radius: 6px;
    background: linear-gradient(90deg,
        #ef4444 0%,
        #f97316 25%,
        #22c55e 50%,
        #3b82f6 75%,
        #8b5cf6 100%
    );
    outline: none;
    cursor: pointer;
}

.slope-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: white;
    border: 3px solid var(--secondary);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.slope-slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: white;
    border: 3px solid var(--secondary);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.slope-labels {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.slope-value {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    padding: 0.25rem 0.75rem;
    background: var(--dark-surface);
    border-radius: 6px;
}

.slope-presets {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
}

.slope-preset-btn {
    background: var(--dark-surface);
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: 0.5rem 0.75rem;
    font-size: 0.75rem;
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s ease;
}

.slope-preset-btn:hover {
    border-color: var(--secondary);
    background: rgba(59, 130, 246, 0.1);
}

.slope-preset-btn.active {
    border-color: var(--secondary);
    background: rgba(59, 130, 246, 0.2);
}

/* =====================================================
   BRAKE FADE CONTROLS
   ===================================================== */

.brake-fade-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.brake-fade-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 12px;
    border-radius: 6px;
    background: linear-gradient(90deg,
        #22c55e 0%,
        #84cc16 20%,
        #facc15 40%,
        #f97316 60%,
        #ef4444 80%,
        #dc2626 100%
    );
    outline: none;
    cursor: pointer;
}

.brake-fade-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: white;
    border: 3px solid var(--primary);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.brake-fade-slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: white;
    border: 3px solid var(--primary);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.brake-fade-labels {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.brake-fade-value {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    padding: 0.25rem 0.75rem;
    background: var(--dark-surface);
    border-radius: 6px;
    transition: all 0.3s ease;
}

.brake-fade-value.hot {
    color: #f97316;
    background: rgba(249, 115, 22, 0.2);
}

.brake-fade-value.danger {
    color: #ef4444;
    background: rgba(239, 68, 68, 0.2);
    animation: pulse-danger 1s infinite;
}

@keyframes pulse-danger {
    0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4); }
    50% { box-shadow: 0 0 0 8px rgba(239, 68, 68, 0); }
}

.brake-fade-visual {
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--dark-surface);
    border-radius: 8px;
    overflow: hidden;
}

.fade-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 90%;
}

.fade-bar {
    flex: 1;
    height: 20px;
    background: linear-gradient(90deg, #22c55e, #22c55e);
    border-radius: 4px;
    transition: all 0.3s ease;
}

.fade-temp {
    font-size: 1.5rem;
}

.brake-fade-presets {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
}

.fade-preset-btn {
    background: var(--dark-surface);
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: 0.5rem 0.75rem;
    font-size: 0.75rem;
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s ease;
}

.fade-preset-btn:hover {
    border-color: var(--primary);
    background: rgba(239, 68, 68, 0.1);
}

.fade-preset-btn.active {
    border-color: var(--primary);
    background: rgba(239, 68, 68, 0.2);
}

/* =====================================================
   TYRE COMPOUND SELECTOR
   ===================================================== */

.compound-selector {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.5rem;
}

.compound-btn {
    background: var(--dark-surface);
    border: 2px solid var(--border);
    border-radius: 12px;
    padding: 0.75rem 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    text-align: center;
}

.compound-btn:hover {
    border-color: var(--secondary);
    background: rgba(59, 130, 246, 0.1);
    transform: translateY(-2px);
}

.compound-btn.active {
    border-color: var(--secondary);
    background: rgba(59, 130, 246, 0.2);
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.3);
}

.compound-icon {
    font-size: 1.5rem;
}

.compound-name {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text);
}

.compound-desc {
    font-size: 0.65rem;
    color: var(--text-muted);
}

/* Track compound warning */
.compound-btn[data-compound="track"] {
    border-color: rgba(239, 68, 68, 0.3);
}

.compound-btn[data-compound="track"]:hover {
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

.compound-btn[data-compound="track"].active {
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.2);
    box-shadow: 0 0 15px rgba(239, 68, 68, 0.3);
}

/* =====================================================
   MOBILE RESPONSIVE FOR NEW PHYSICS CONTROLS
   ===================================================== */

@media (max-width: 768px) {
    .slope-presets {
        flex-wrap: wrap;
    }

    .slope-preset-btn {
        flex: 1 1 auto;
        min-width: 80px;
    }

    .compound-selector {
        grid-template-columns: repeat(3, 1fr);
    }

    .brake-fade-presets {
        flex-wrap: wrap;
    }
}

@media (max-width: 500px) {
    .slope-visual {
        height: 50px;
    }

    .slope-car {
        font-size: 1.5rem;
    }

    .slope-preset-btn {
        padding: 0.4rem 0.5rem;
        font-size: 0.65rem;
    }

    .compound-selector {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.35rem;
    }

    .compound-btn {
        padding: 0.5rem 0.25rem;
    }

    .compound-icon {
        font-size: 1.25rem;
    }

    .compound-name {
        font-size: 0.7rem;
    }

    .compound-desc {
        font-size: 0.55rem;
    }

    .fade-preset-btn {
        padding: 0.4rem 0.5rem;
        font-size: 0.65rem;
    }
}

/* =====================================================
   SHARE BUTTON & MODAL
   ===================================================== */

.btn-share {
    flex: 1;
    padding: 1rem;
    border-radius: 8px;
    font-family: 'Orbitron', monospace;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    background: var(--secondary);
    border: none;
    color: white;
}

.btn-share:hover {
    background: #2563eb;
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.4);
}

/* Share Modal */
.share-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.share-modal.hidden {
    display: none;
}

.share-modal-content {
    background: var(--dark-card);
    border: 2px solid var(--secondary);
    border-radius: 16px;
    padding: 2rem;
    max-width: 480px;
    width: 100%;
    position: relative;
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.share-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    transition: color 0.2s ease;
    line-height: 1;
}

.share-close:hover {
    color: var(--danger);
}

.share-modal-content h3 {
    font-family: 'Orbitron', monospace;
    font-size: 1.25rem;
    color: var(--secondary);
    margin-bottom: 0.75rem;
    text-align: center;
}

.share-summary {
    font-size: 0.9rem;
    color: var(--text);
    text-align: center;
    margin-bottom: 1.5rem;
    line-height: 1.5;
    background: var(--dark-surface);
    padding: 1rem;
    border-radius: 8px;
    border-left: 3px solid var(--secondary);
}

.share-link-container {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

#share-link {
    flex: 1;
    background: var(--dark-surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    color: var(--text);
    font-size: 0.85rem;
    font-family: 'JetBrains Mono', monospace;
}

#share-link:focus {
    outline: none;
    border-color: var(--secondary);
}

.btn-copy {
    background: var(--secondary);
    border: none;
    border-radius: 8px;
    padding: 0.75rem 1.25rem;
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-copy:hover {
    background: #2563eb;
}

.btn-copy.copied {
    background: var(--primary);
}

.share-buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.share-social {
    padding: 0.75rem;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s ease;
    color: white;
}

.share-twitter {
    background: #1da1f2;
}

.share-twitter:hover {
    background: #0c8de4;
}

.share-facebook {
    background: #4267B2;
}

.share-facebook:hover {
    background: #365899;
}

.share-linkedin {
    background: #0077b5;
}

.share-linkedin:hover {
    background: #006097;
}

.share-copied {
    text-align: center;
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 600;
    padding: 0.5rem;
    background: rgba(34, 197, 94, 0.1);
    border-radius: 6px;
    animation: fadeInUp 0.3s ease-out;
}

.share-copied.hidden {
    display: none;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* =====================================================
   SAVED RUNS / COMPARE FEATURE
   ===================================================== */

.saved-runs-section {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

.saved-runs-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.saved-runs-header h4 {
    margin: 0;
    color: var(--text);
    font-size: 0.9rem;
}

.btn-clear-runs {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.7rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-clear-runs:hover {
    border-color: #ef4444;
    color: #ef4444;
}

.saved-runs-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.saved-run {
    background: var(--dark-surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.75rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    position: relative;
    transition: all 0.2s ease;
}

.saved-run.current-run {
    border-color: var(--primary);
    background: rgba(34, 197, 94, 0.1);
}

.run-main {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
    flex: 1;
    min-width: 150px;
}

.run-distance {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary);
}

.run-speed {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.current-badge {
    background: var(--primary);
    color: var(--dark);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-size: 0.6rem;
    font-weight: 700;
    text-transform: uppercase;
}

.run-details {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.run-details span {
    background: var(--dark-card);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.7rem;
    color: var(--text-muted);
}

.btn-delete-run {
    position: absolute;
    top: 0.25rem;
    right: 0.25rem;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    padding: 0.25rem;
    opacity: 0;
    transition: all 0.2s ease;
}

.saved-run:hover .btn-delete-run {
    opacity: 1;
}

.btn-delete-run:hover {
    color: #ef4444;
}

.runs-comparison {
    margin-top: 0.75rem;
    padding: 0.5rem;
    background: var(--dark-surface);
    border-radius: 6px;
    text-align: center;
    font-size: 0.85rem;
}

.comparison-good {
    color: var(--primary);
    font-weight: 600;
}

.comparison-info {
    color: var(--text-muted);
}

.no-runs {
    color: var(--text-muted);
    font-size: 0.85rem;
    text-align: center;
    padding: 1rem;
}

/* =====================================================
   CHALLENGE MODE STYLES
   ===================================================== */

.challenge-banner {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    color: white;
    padding: 0.75rem 1rem;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
    }
    to {
        transform: translateY(0);
    }
}

.challenge-banner-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    max-width: 600px;
    margin: 0 auto;
}

.challenge-banner-icon {
    font-size: 1.5rem;
}

.challenge-banner-text {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.challenge-banner-text strong {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.challenge-banner-text span {
    font-size: 1.1rem;
    font-weight: 700;
}

.challenge-banner-close {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.challenge-banner-close:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Challenge result banner in results panel */
.challenge-result-banner {
    padding: 1rem;
    border-radius: 10px;
    margin-bottom: 1rem;
    text-align: center;
    animation: bounceIn 0.5s ease-out;
}

@keyframes bounceIn {
    0% {
        transform: scale(0.8);
        opacity: 0;
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.challenge-result-banner.won {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.2) 0%, rgba(16, 185, 129, 0.2) 100%);
    border: 2px solid var(--primary);
}

.challenge-result-banner.lost {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.2) 0%, rgba(220, 38, 38, 0.2) 100%);
    border: 2px solid #ef4444;
}

.challenge-result-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.challenge-result-icon {
    font-size: 2rem;
}

.challenge-result-message {
    font-size: 1rem;
    font-weight: 600;
}

.challenge-result-banner.won .challenge-result-message {
    color: var(--primary);
}

.challenge-result-banner.lost .challenge-result-message {
    color: #ef4444;
}

/* Challenge modal styles */
.challenge-result {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--dark-surface);
    border-radius: 10px;
    margin-bottom: 1rem;
}

.challenge-icon {
    font-size: 2.5rem;
}

.challenge-stats {
    display: flex;
    flex-direction: column;
}

.challenge-distance {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
}

.challenge-details {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.challenge-prompt {
    text-align: center;
    color: var(--text);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.challenge-target {
    text-align: center;
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid #f59e0b;
    color: #f59e0b;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

/* Mobile responsive for saved runs and challenge */
@media (max-width: 768px) {
    .saved-runs-section {
        margin-top: 1rem;
        padding-top: 1rem;
    }

    .saved-run {
        padding: 0.5rem;
    }

    .run-distance {
        font-size: 1rem;
    }

    .run-details span {
        font-size: 0.65rem;
        padding: 0.15rem 0.35rem;
    }

    .challenge-banner {
        padding: 0.5rem;
    }

    .challenge-banner-text strong {
        font-size: 0.75rem;
    }

    .challenge-banner-text span {
        font-size: 0.9rem;
    }

    .challenge-result {
        flex-direction: column;
        gap: 0.5rem;
        padding: 0.75rem;
    }

    .challenge-distance {
        font-size: 1.5rem;
    }
}

@media (max-width: 500px) {
    .run-main {
        min-width: 100%;
    }

    .run-details {
        width: 100%;
    }

    .btn-delete-run {
        opacity: 1;
    }
}

/* =====================================================
   CREATOR FOOTER
   ===================================================== */

.creator-footer {
    background: linear-gradient(180deg, var(--dark-card) 0%, var(--dark) 100%);
    border-top: 1px solid var(--border);
    padding: 1.5rem 2rem;
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-logo {
    font-family: 'Orbitron', monospace;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 2px;
    text-shadow: 0 0 20px rgba(34, 197, 94, 0.3);
}

.footer-divider {
    color: var(--border);
    font-size: 1.25rem;
}

.footer-credit {
    font-size: 0.95rem;
    color: var(--text);
    font-weight: 500;
}

.footer-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.footer-physics {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
}

.footer-copyright {
    font-size: 0.7rem;
    color: var(--text-muted);
    opacity: 0.7;
}

/* Mobile responsive for footer and share */
@media (max-width: 768px) {
    .results-buttons {
        flex-direction: column;
    }

    .share-buttons {
        grid-template-columns: 1fr;
    }

    .share-modal-content {
        padding: 1.5rem;
    }

    .footer-brand {
        flex-direction: column;
        gap: 0.25rem;
    }

    .footer-divider {
        display: none;
    }

    .footer-logo {
        font-size: 1.1rem;
    }
}

@media (max-width: 500px) {
    .share-link-container {
        flex-direction: column;
    }

    .btn-copy {
        width: 100%;
    }

    .creator-footer {
        padding: 1rem;
    }

    .footer-physics {
        font-size: 0.65rem;
        text-align: center;
    }
}

/* =====================================================
   FOOTER ENHANCEMENTS
   ===================================================== */

.footer-tagline {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-creator {
    margin: 0.5rem 0;
}

.footer-credit {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-credit strong {
    color: var(--primary);
}

.footer-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 0.75rem;
    flex-wrap: wrap;
}

.footer-link {
    color: var(--secondary);
    text-decoration: none;
    font-size: 0.85rem;
    background: none;
    border: none;
    cursor: pointer;
    transition: color 0.2s ease;
}

.footer-link:hover {
    color: var(--primary);
    text-decoration: underline;
}

/* =====================================================
   TECHNICAL DOCUMENTATION SECTION
   ===================================================== */

.documentation-section {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--dark);
    z-index: 2000;
    overflow-y: auto;
    padding: 2rem;
}

.documentation-section.hidden {
    display: none;
}

.doc-container {
    max-width: 900px;
    margin: 0 auto;
}

.doc-header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--primary);
    position: relative;
}

.doc-header h2 {
    font-family: 'Orbitron', monospace;
    font-size: 1.75rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.doc-header p {
    color: var(--text-muted);
    font-size: 1rem;
}

.doc-close-btn {
    position: absolute;
    top: 0;
    right: 0;
    background: var(--dark-card);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.doc-close-btn:hover {
    background: var(--danger);
    border-color: var(--danger);
}

.doc-card {
    background: var(--dark-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.doc-card h3 {
    font-size: 1.1rem;
    color: var(--primary);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
}

.doc-card p {
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 0.75rem;
}

.doc-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: 1rem;
}

.stat-box {
    background: var(--dark-surface);
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
    border: 1px solid var(--border);
}

.stat-value {
    display: block;
    font-family: 'Orbitron', monospace;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-top: 0.25rem;
}

.formula-box {
    background: var(--dark-surface);
    border: 1px solid var(--secondary);
    border-radius: 8px;
    padding: 1.25rem;
    text-align: center;
    margin-bottom: 1rem;
}

.formula-box code {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 1.1rem;
    color: var(--secondary);
}

.formula-legend {
    list-style: none;
    padding: 0;
    margin: 0;
}

.formula-legend li {
    padding: 0.35rem 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.formula-legend li strong {
    color: var(--text);
    font-family: monospace;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
    margin-bottom: 0.75rem;
}

.data-table th {
    background: var(--dark-surface);
    color: var(--text);
    font-weight: 600;
    text-align: left;
    padding: 0.75rem;
    border-bottom: 2px solid var(--border);
}

.data-table td {
    padding: 0.65rem 0.75rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-muted);
}

.data-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

.grade-a-row td:first-child { color: var(--grade-a); }
.grade-b-row td:first-child { color: var(--grade-b); }
.grade-c-row td:first-child { color: var(--grade-c); }
.grade-d-row td:first-child { color: var(--grade-d); }
.grade-e-row td:first-child { color: var(--grade-e); }

.source-note {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-style: italic;
    opacity: 0.8;
    margin-top: 0.5rem;
}

.note-box {
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid var(--secondary);
    border-radius: 6px;
    padding: 0.75rem;
    font-size: 0.85rem;
    margin-top: 0.75rem;
}

.validation-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.validation-list li {
    padding: 0.5rem 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.reference-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.reference-list li {
    padding: 0.5rem 0;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-bottom: 1px solid var(--border);
}

.reference-list li:last-child {
    border-bottom: none;
}

.reference-list li strong {
    color: var(--text);
}

.disclaimer-card {
    border-color: var(--warning);
    background: rgba(245, 158, 11, 0.05);
}

.disclaimer-card h3 {
    color: var(--warning);
}

.disclaimer-card ul {
    list-style: disc;
    margin-left: 1.5rem;
    color: var(--text-muted);
}

.disclaimer-card li {
    padding: 0.25rem 0;
}

.doc-footer {
    text-align: center;
    padding: 2rem 0 1rem;
    border-top: 1px solid var(--border);
    margin-top: 2rem;
}

.doc-footer p {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 0.25rem;
}

/* =====================================================
   ENHANCED SCIENTIFIC DOCUMENTATION STYLES
   ===================================================== */

.doc-subtitle {
    font-size: 1rem;
    color: var(--secondary);
    font-weight: 500;
}

/* Research Banner */
.research-banner {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.1) 0%, rgba(59, 130, 246, 0.1) 100%);
    border: 2px solid var(--primary);
}

.research-banner h3 {
    border-bottom: none;
    text-align: center;
    font-size: 1.3rem;
}

.banner-content {
    text-align: center;
    margin-bottom: 1.5rem;
}

.banner-content p {
    max-width: 700px;
    margin: 0 auto;
}

.doc-stats {
    grid-template-columns: repeat(4, 1fr);
}

.stat-box.highlight {
    border-color: var(--primary);
    background: rgba(34, 197, 94, 0.1);
}

.stat-box.highlight .stat-value {
    font-size: 1.8rem;
}

/* Methodology Grid */
.methodology-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-top: 1rem;
}

.method-item {
    display: flex;
    gap: 1rem;
    background: var(--dark-surface);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--border);
}

.method-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--primary);
    color: var(--dark);
    font-weight: 700;
    border-radius: 50%;
    flex-shrink: 0;
}

.method-content h4 {
    color: var(--text);
    font-size: 0.95rem;
    margin-bottom: 0.35rem;
}

.method-content p {
    font-size: 0.8rem;
    line-height: 1.5;
    margin: 0;
}

/* Formula Sections */
.formula-section {
    background: var(--dark-surface);
    border-radius: 8px;
    padding: 1.25rem;
    margin-bottom: 1.25rem;
    border: 1px solid var(--border);
}

.formula-section h4 {
    color: var(--secondary);
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
}

.formula-box.main-formula {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.15) 0%, rgba(34, 197, 94, 0.15) 100%);
    border: 2px solid var(--secondary);
}

.formula-box.main-formula code {
    font-size: 1.3rem;
    font-weight: 600;
}

.formula-legend {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.legend-item .var {
    font-family: 'JetBrains Mono', monospace;
    color: var(--secondary);
    background: var(--dark-card);
    padding: 0.15rem 0.35rem;
    border-radius: 4px;
    font-size: 0.8rem;
}

.formula-note {
    font-size: 0.8rem;
    font-style: italic;
    color: var(--text-muted);
    margin-top: 0.75rem;
}

/* Coefficient Table */
.coefficient-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8rem;
    margin-top: 0.75rem;
}

.coefficient-table th {
    background: var(--dark-card);
    color: var(--text);
    font-weight: 600;
    text-align: left;
    padding: 0.6rem;
    border-bottom: 2px solid var(--primary);
}

.coefficient-table td {
    padding: 0.5rem 0.6rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-muted);
}

.coefficient-table code {
    font-family: 'JetBrains Mono', monospace;
    color: var(--secondary);
    font-size: 0.75rem;
}

/* Scientific Data Tables */
.data-table.scientific {
    font-size: 0.8rem;
}

.data-table.scientific th {
    background: linear-gradient(135deg, var(--dark-surface) 0%, var(--dark-card) 100%);
    color: var(--secondary);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table.scientific td code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--secondary);
}

/* Row highlighting */
.warning-row {
    background: rgba(245, 158, 11, 0.1);
}

.warning-row td {
    color: var(--warning);
}

.danger-row {
    background: rgba(239, 68, 68, 0.1);
}

.danger-row td {
    color: var(--danger);
}

.optimal-row {
    background: rgba(34, 197, 94, 0.1);
}

.optimal-row td {
    color: var(--primary);
}

/* Chart Container */
.chart-container {
    background: var(--dark-surface);
    border-radius: 8px;
    padding: 1.25rem;
    margin: 1rem 0;
    border: 1px solid var(--border);
}

.chart-container h4 {
    color: var(--text);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    text-align: center;
}

.chart-note {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
    font-style: italic;
    margin-top: 0.75rem;
}

/* Bar Chart */
.bar-chart {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.chart-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.chart-label {
    width: 70px;
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: right;
    flex-shrink: 0;
}

.chart-bar {
    height: 28px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--dark);
    transition: width 0.3s ease;
}

.chart-bar.grade-a { background: linear-gradient(90deg, var(--grade-a), #16a34a); }
.chart-bar.grade-b { background: linear-gradient(90deg, var(--grade-b), #65a30d); }
.chart-bar.grade-c { background: linear-gradient(90deg, var(--grade-c), #eab308); }
.chart-bar.grade-d { background: linear-gradient(90deg, var(--grade-d), #ea580c); }
.chart-bar.grade-e { background: linear-gradient(90deg, var(--grade-e), #dc2626); }

/* Line Chart Visual */
.line-chart-visual {
    display: flex;
    gap: 0.5rem;
    align-items: stretch;
    height: 120px;
}

.chart-y-axis {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 0.5rem 0;
    font-size: 0.7rem;
    color: var(--text-muted);
    text-align: right;
    width: 40px;
}

.chart-area {
    flex: 1;
    background: var(--dark-card);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.5rem;
}

.curve-svg {
    width: 100%;
    height: 100%;
}

.chart-x-axis {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0.5rem 0;
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* Note Box Scientific */
.note-box.scientific {
    background: rgba(59, 130, 246, 0.08);
    border-left: 4px solid var(--secondary);
    border-radius: 0 6px 6px 0;
}

/* Validation Summary */
.validation-summary {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    padding: 1.5rem;
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.05) 0%, rgba(59, 130, 246, 0.05) 100%);
    border-radius: 12px;
    border: 1px solid var(--border);
}

.validation-stat {
    text-align: center;
}

.big-number {
    display: block;
    font-family: 'Orbitron', monospace;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
}

.stat-desc {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    line-height: 1.4;
}

/* Validation Table */
.validation-table th {
    font-size: 0.7rem;
}

.validation-table td {
    font-size: 0.8rem;
}

.validation-table .pass {
    color: var(--primary);
    font-weight: 600;
}

.validation-table tfoot .total-row {
    background: var(--dark-surface);
}

.validation-table tfoot td {
    border-top: 2px solid var(--primary);
    font-weight: 600;
}

/* Source Categories */
.source-category {
    margin-bottom: 1.5rem;
}

.source-category h4 {
    color: var(--secondary);
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
}

.reference-list.detailed li {
    display: flex;
    flex-direction: column;
    padding: 0.75rem 0;
}

.reference-list.detailed li strong {
    color: var(--text);
    font-size: 0.9rem;
}

.ref-detail {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
    opacity: 0.9;
}

/* Limitation List */
.limitation-list {
    list-style: none;
    padding: 0;
    margin: 0.75rem 0;
}

.limitation-list li {
    position: relative;
    padding: 0.35rem 0 0.35rem 1.5rem;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.limitation-list li::before {
    content: '•';
    position: absolute;
    left: 0.5rem;
    color: var(--warning);
}

.disclaimer-warning {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--danger);
    border-radius: 6px;
    padding: 0.75rem;
    margin-top: 1rem;
    font-size: 0.85rem;
}

/* Mobile responsive for documentation */
@media (max-width: 768px) {
    .documentation-section {
        padding: 1rem;
    }

    .doc-header h2 {
        font-size: 1.3rem;
    }

    .doc-close-btn {
        position: relative;
        margin-top: 1rem;
        width: 100%;
    }

    .doc-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .stat-box.highlight .stat-value {
        font-size: 1.4rem;
    }

    .methodology-grid {
        grid-template-columns: 1fr;
    }

    .validation-summary {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .big-number {
        font-size: 2rem;
    }

    .formula-legend {
        grid-template-columns: 1fr;
    }

    .data-table {
        font-size: 0.7rem;
    }

    .data-table th,
    .data-table td {
        padding: 0.4rem;
    }

    .chart-label {
        width: 55px;
        font-size: 0.7rem;
    }

    .chart-bar {
        font-size: 0.65rem;
        padding-right: 0.5rem;
    }

    .line-chart-visual {
        height: 100px;
    }
}

@media (max-width: 500px) {
    .footer-links {
        flex-direction: column;
        gap: 0.5rem;
    }

    .footer-links .footer-divider {
        display: none;
    }
}