/* ═══════════════════════════════════════════════════════════════════════════
   TNPF - INDUSTRIAL THEME
   Garage Mechanics / Swiss Industrial Aesthetic
   ═══════════════════════════════════════════════════════════════════════════ */

/* Reset & Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Industrial Color Palette */
    --tire-black: #0a0a0a;
    --rubber-dark: #1a1a1a;
    --chrome: #c0c0c0;
    --chrome-light: #e8e8e8;
    --chrome-dim: #888888;
    --brake-red: #dc2626;
    --accent-yellow: #facc15;
    --warning-orange: #f97316;
    --grille-gray: #2d3748;
    --bolt-silver: #9ca3af;
    --oil-black: #0f172a;
    --steel-blue: #334155;

    /* Backgrounds */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: linear-gradient(145deg, var(--tire-black), var(--rubber-dark));
    --bg-card-hover: linear-gradient(145deg, var(--rubber-dark), #222222);

    /* Text */
    --text-primary: var(--chrome-light);
    --text-secondary: var(--bolt-silver);
    --text-inverted: var(--tire-black);

    /* Borders */
    --border-subtle: 1px solid rgba(192, 192, 192, 0.2);
    --border-strong: 2px solid var(--chrome);

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

    /* Typography */
    --font-display: 'Oswald', 'Impact', 'Arial Black', sans-serif;
    --font-body: 'JetBrains Mono', 'Roboto Mono', 'Courier New', monospace;
    --font-accent: 'Playfair Display', Georgia, serif;
    --font-system: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Shadows */
    --shadow-inset: inset 0 2px 4px rgba(0, 0, 0, 0.4);
    --shadow-mechanical:
        0 4px 0 var(--grille-gray),
        0 8px 12px rgba(0, 0, 0, 0.4);

    /* Transitions */
    --ease-mechanical: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Dark Mode is default for Industrial theme */
[data-theme="light"] {
    --bg-primary: #f5f5f5;
    --bg-secondary: #e5e5e5;
    --bg-card: linear-gradient(145deg, #ffffff, #f0f0f0);
    --bg-card-hover: linear-gradient(145deg, #f0f0f0, #e5e5e5);
    --text-primary: #0a0a0a;
    --text-secondary: #4a4a4a;
    --border-subtle: 1px solid rgba(0, 0, 0, 0.1);
    --shadow-mechanical:
        0 4px 0 var(--grille-gray),
        0 8px 12px rgba(0, 0, 0, 0.15);
}

/* Grid Pattern Background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
    z-index: -1;
}

/* Noise Texture Overlay */
body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: -1;
}

body {
    font-family: var(--font-system);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: background 0.3s ease;
    overflow-x: hidden;
}

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: #000;
    color: var(--chrome-light);
    padding: 8px 16px;
    z-index: 9999;
    transition: top 0.3s;
    text-decoration: none;
    font-family: var(--font-system);
    border: 1px solid var(--chrome);
}

.skip-link:focus {
    top: 0;
    outline: 2px solid var(--accent-yellow);
    outline-offset: -4px;
}

/* ═══════════════════════════════════════════════════════════════════════════
   HERO SECTION - INDUSTRIAL
   ═══════════════════════════════════════════════════════════════════════════ */

.hero-header {
    min-height: 40vh;
    background:
        radial-gradient(ellipse at 30% 50%, rgba(250, 204, 21, 0.03) 0%, transparent 60%),
        linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg) var(--space-md);
    border-bottom: 4px solid var(--chrome);
}

/* Giant wheel background silhouette */
.hero-header::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80vw;
    height: 80vw;
    max-width: 800px;
    max-height: 800px;
    background:
        radial-gradient(circle at center,
            transparent 30%,
            rgba(192, 192, 192, 0.02) 31%,
            rgba(192, 192, 192, 0.02) 32%,
            transparent 33%),
        radial-gradient(circle at center,
            transparent 45%,
            rgba(192, 192, 192, 0.015) 46%,
            rgba(192, 192, 192, 0.015) 47%,
            transparent 48%),
        radial-gradient(circle at center,
            transparent 60%,
            rgba(192, 192, 192, 0.01) 61%,
            rgba(192, 192, 192, 0.01) 62%,
            transparent 63%);
    opacity: 0.6;
    pointer-events: none;
}

.header-content {
    position: relative;
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    max-width: 1400px;
    width: 100%;
}

/* Logo Container - Industrial */
.logo-container {
    position: relative;
    width: clamp(80px, 20vw, 180px);
    height: clamp(80px, 20vw, 180px);
    display: flex;
    align-items: center;
    justify-content: center;
}

.premium-logo {
    filter: drop-shadow(0 0 15px rgba(192, 192, 192, 0.3));
    transition: filter 0.3s ease;
}

.premium-logo:hover {
    filter: drop-shadow(0 0 25px rgba(250, 204, 21, 0.5));
}

/* Main Title - Industrial Typography */
.main-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 10vw, 8rem);
    font-weight: 700;
    line-height: 0.85;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--chrome-light);
    text-shadow:
        0 2px 4px rgba(0, 0, 0, 0.5),
        0 0 40px rgba(250, 204, 21, 0.1);
    margin: 0;
    text-align: center;
    position: relative;
}

/* Industrial underline - mechanical */
.main-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 30%;
    min-width: 200px;
    height: 4px;
    background: linear-gradient(90deg,
        transparent 0%,
        var(--accent-yellow) 20%,
        var(--accent-yellow) 80%,
        transparent 100%);
    border-radius: 2px;
}

/* Taglines */
.tagline-line {
    font-family: var(--font-body);
    font-size: clamp(0.75rem, 1.5vw, 1rem);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--chrome-dim);
    margin: 0;
    text-align: center;
}

/* Decorative mechanical divider */
.decorative-line {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    margin-top: var(--space-md);
    width: 100%;
    max-width: 600px;
}

.ruler-left,
.ruler-right {
    flex: 1;
    height: 2px;
    background:
        repeating-linear-gradient(
            90deg,
            var(--chrome-dim) 0px,
            var(--chrome-dim) 4px,
            transparent 4px,
            transparent 8px
        );
    max-width: 100px;
}

.ruler-right {
    transform: rotate(180deg);
}

.gauge {
    display: flex;
    gap: 2px;
    padding: 0 var(--space-sm);
}

.gauge span {
    display: block;
    width: 3px;
    height: 20px;
    background: linear-gradient(180deg, var(--chrome) 0%, var(--chrome-dim) 100%);
    border-radius: 1px;
}

.gauge span:nth-child(odd) {
    height: 12px;
}

.gauge span:nth-child(5n) {
    background: var(--accent-yellow);
}

.connector {
    width: 40px;
    height: 20px;
    color: var(--chrome-dim);
    margin-left: var(--space-sm);
}

/* ═══════════════════════════════════════════════════════════════════════════
   CONTAINER & LAYOUT
   ═══════════════════════════════════════════════════════════════════════════ */

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: transparent;
    border-radius: 0;
    overflow: visible;
}

main {
    padding: var(--space-2xl) var(--space-md);
}

/* ═══════════════════════════════════════════════════════════════════════════
   SEARCH SECTION - INDUSTRIAL
   ═══════════════════════════════════════════════════════════════════════════ */

.search-section {
    margin-bottom: var(--space-2xl);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.input-group {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
    position: relative;
}

.input-group::before {
    content: '🔍';
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.5rem;
    z-index: 2;
    filter: grayscale(100%) contrast(150%);
    opacity: 0.6;
}

.input-group input {
    flex: 1;
    padding: 1.25rem 1rem 1.25rem 3.5rem;
    background:
        linear-gradient(145deg, #2a2a2a, #1a1a1a);
    border: 2px solid var(--grille-gray);
    border-radius: 0; /* Sharp edges */
    color: var(--chrome-light);
    font-family: var(--font-body);
    font-size: 1.125rem;
    transition: all 0.2s var(--ease-mechanical);
    box-shadow:
        inset 0 2px 4px rgba(0, 0, 0, 0.4),
        0 1px 0 rgba(255, 255, 255, 0.05);
    outline: none;
}

.input-group input::placeholder {
    color: var(--bolt-silver);
    opacity: 0.6;
}

.input-group input:focus {
    border-color: var(--accent-yellow);
    box-shadow:
        inset 0 2px 4px rgba(0, 0, 0, 0.4),
        0 0 0 3px rgba(250, 204, 21, 0.15),
        0 1px 0 rgba(255, 255, 255, 0.05);
    background:
        linear-gradient(145deg, #333333, #222222);
}

/* Animated underline on focus */
.input-group input::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 3px;
    background: var(--accent-yellow);
    transition: width 0.3s var(--ease-mechanical);
}

.input-group input:focus::after {
    width: 100%;
}

.input-group button {
    padding: 1.25rem 2.5rem;
    background: linear-gradient(180deg, var(--chrome) 0%, #a0a0a0 100%);
    border: none;
    border-radius: 0;
    color: var(--tire-black);
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: all 0.1s var(--ease-mechanical);
    box-shadow:
        0 4px 0 #808080,
        inset 0 1px 0 rgba(255, 255, 255, 0.5);
    position: relative;
    outline: none;
}

.input-group button:hover {
    transform: translateY(-2px);
    box-shadow:
        0 6px 0 #808080,
        inset 0 1px 0 rgba(255, 255, 255, 0.5);
    background: linear-gradient(180deg, var(--chrome-light) 0%, #b0b0b0 100%);
}

.input-group button:active {
    transform: translateY(2px);
    box-shadow:
        0 2px 0 #808080,
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.input-group button:focus-visible {
    outline: 2px solid var(--accent-yellow);
    outline-offset: 2px;
}

/* Examples */
.examples {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
    color: var(--text-secondary);
    font-size: 0.875rem;
    padding: var(--space-md);
    background: rgba(192, 192, 192, 0.05);
    border: var(--border-subtle);
    border-radius: 0;
}

.example-btn {
    padding: 0.5rem 1rem;
    background: linear-gradient(180deg, var(--steel-blue), var(--grille-gray));
    border: 1px solid var(--bolt-silver);
    border-radius: 0;
    color: var(--chrome-light);
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s var(--ease-mechanical);
}

.example-btn:hover {
    background: linear-gradient(180deg, var(--grille-gray), #1a202c);
    border-color: var(--accent-yellow);
    transform: translateY(-1px);
}

/* ═══════════════════════════════════════════════════════════════════════════
   RESULTS SECTION
   ═══════════════════════════════════════════════════════════════════════════ */

.results-section {
    background: transparent;
    padding: 0;
    margin-bottom: var(--space-2xl);
}

.original-tire {
    background: var(--bg-card);
    border: 2px solid #10b981;
    border-left: 6px solid #10b981;
    border-radius: 0;
    padding: var(--space-lg) var(--space-xl);
    margin-bottom: var(--space-xl);
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    flex-wrap: wrap;
    box-shadow:
        0 4px 12px rgba(16, 185, 129, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    position: relative;
}

.original-tire::before {
    content: '🎯';
    position: absolute;
    right: var(--space-lg);
    opacity: 0.3;
    font-size: 3rem;
}

.original-tire .label {
    font-family: var(--font-accent);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: #10b981;
    font-weight: 700;
}

.original-tire .size {
    font-family: var(--font-body);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--chrome-light);
    letter-spacing: 0.05em;
}

.original-tire .details {
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 0.875rem;
}

/* Equivalences Header */
.equivalences-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
    gap: var(--space-md);
    padding-bottom: var(--space-md);
    border-bottom: 2px solid var(--chrome-dim);
}

.equivalences-header h2 {
    font-family: var(--font-display);
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--chrome-light);
    margin: 0;
}

.equivalences-header h2 span {
    color: var(--accent-yellow);
    font-weight: 700;
}

/* Filter Group */
.filter-group {
    display: flex;
    gap: var(--space-lg);
    font-size: 0.875rem;
}

.filter-group label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    cursor: pointer;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
    transition: color 0.2s;
}

.filter-group label:hover {
    color: var(--chrome-light);
}

.filter-group input[type="checkbox"] {
    appearance: none;
    width: 24px;
    height: 24px;
    border: 2px solid var(--chrome);
    background: var(--tire-black);
    cursor: pointer;
    position: relative;
    transition: all 0.2s var(--ease-mechanical);
}

.filter-group input[type="checkbox"]:checked {
    background: var(--accent-yellow);
    border-color: var(--accent-yellow);
}

.filter-group input[type="checkbox"]:checked::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--tire-black);
    font-size: 14px;
    font-weight: 900;
}

/* ═══════════════════════════════════════════════════════════════════════════
   EQUIVALENCE CARDS - MECHANICAL DESIGN
   ═══════════════════════════════════════════════════════════════════════════ */

.equivalences-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    max-width: 900px;
    margin: 0 auto;
}

.equivalence-card {
    background: var(--bg-card);
    border: 1px solid var(--chrome);
    border-left: 4px solid var(--chrome);
    border-radius: 0;
    padding: var(--space-xl) var(--space-2xl);
    transition: all 0.2s var(--ease-mechanical);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    /* Cut corner bottom-right - industrial feel */
    clip-path: polygon(
        0 0,
        calc(100% - 15px) 0,
        100% 15px,
        100% 100%,
        0 100%
    );
    box-shadow:
        0 4px 6px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.equivalence-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-yellow);
    border-left-color: var(--accent-yellow);
    box-shadow:
        0 8px 16px rgba(0, 0, 0, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

/* Metallic sheen sweep effect */
.equivalence-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: -150%;
    width: 80%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(250, 204, 21, 0.05),
        transparent
    );
    transition: left 0.8s var(--ease-mechanical);
    pointer-events: none;
}

.equivalence-card:hover::after {
    left: 150%;
}

/* Staggered animation for cards appearing */
@keyframes cardEnter {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.equivalence-card {
    animation: cardEnter 0.4s var(--ease-mechanical) backwards;
}

.equivalence-card:nth-child(1) { animation-delay: 0.05s; }
.equivalence-card:nth-child(2) { animation-delay: 0.1s; }
.equivalence-card:nth-child(3) { animation-delay: 0.15s; }
.equivalence-card:nth-child(4) { animation-delay: 0.2s; }
.equivalence-card:nth-child(5) { animation-delay: 0.25s; }
.equivalence-card:nth-child(6) { animation-delay: 0.3s; }
.equivalence-card:nth-child(7) { animation-delay: 0.35s; }
.equivalence-card:nth-child(8) { animation-delay: 0.4s; }
.equivalence-card:nth-child(9) { animation-delay: 0.45s; }
.equivalence-card:nth-child(10) { animation-delay: 0.5s; }

/* Card Header */
.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-md);
    gap: var(--space-md);
}

.equivalence-card .size {
    font-family: var(--font-body);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--chrome-light);
    letter-spacing: 0.05em;
}

.equivalence-card .size small {
    font-size: 0.6rem;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: normal;
}

/* Badges - Industrial */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.2rem 0.4rem;
    border-radius: 0;
    font-family: var(--font-accent);
    font-size: 0.6rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.badge::before {
    font-size: 0.9rem;
}

.badge.ete {
    background: linear-gradient(180deg, #059669 0%, #047857 100%);
    color: white;
    border: 1px solid #047857;
}

.badge.hiver {
    background: linear-gradient(180deg, var(--brake-red) 0%, #b91c1c 100%);
    color: white;
    border: 1px solid #b91c1c;
}

.badge.xl {
    background: linear-gradient(180deg, var(--warning-orange) 0%, #ea580c 100%);
    color: var(--tire-black);
    border: 1px solid #ea580c;
}

/* Specifications */
.equivalence-card .specs {
    display: flex;
    gap: var(--space-md);
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 0.85rem;
    margin-bottom: var(--space-md);
    padding: var(--space-sm);
    background: rgba(0, 0, 0, 0.15);
    border-top: 1px solid var(--chrome-dim);
    border-bottom: 1px solid var(--chrome-dim);
    flex-wrap: wrap;
}

.equivalence-card .spec {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-weight: 500;
    font-size: 0.85rem;
}

.equivalence-card .spec::before {
    font-size: 1rem;
}

.equivalence-card .spec strong {
    color: var(--chrome-light);
    font-weight: 700;
}

/* Differences - Technical Display */
.equivalence-card .differences {
    margin-top: var(--space-sm);
    padding: var(--space-sm);
    background: rgba(0, 0, 0, 0.15);
    border: 1px dashed var(--chrome-dim);
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.equivalence-card .difference {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.4rem;
    background: rgba(192, 192, 192, 0.1);
    border: 1px solid var(--chrome-dim);
}

.equivalence-card .difference.positive {
    color: #10b981;
    border-color: #10b981;
    background: rgba(16, 185, 129, 0.1);
}

.equivalence-card .difference.negative {
    color: var(--brake-red);
    border-color: var(--brake-red);
    background: rgba(220, 38, 38, 0.1);
}

.equivalence-card .difference.neutral {
    color: var(--text-secondary);
    border-color: var(--chrome-dim);
}

/* Winter Card Styling */
.equivalence-card.winter {
    border-left-color: var(--brake-red);
    background:
        linear-gradient(145deg, rgba(220, 38, 38, 0.05), var(--tire-black));
}

.equivalence-card.winter:hover {
    border-left-color: var(--accent-yellow);
}

/* ═══════════════════════════════════════════════════════════════════════════
   NO RESULTS STATE - Industrial
   ═══════════════════════════════════════════════════════════════════════════ */

.no-results {
    text-align: center;
    padding: var(--space-3xl);
    background: var(--bg-card);
    border: 2px dashed var(--chrome-dim);
    color: var(--text-secondary);
}

.no-results::before {
    content: '⚠️';
    display: block;
    font-size: 4rem;
    margin-bottom: var(--space-lg);
    opacity: 0.5;
}

.no-results p {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
    color: var(--chrome-light);
}

.no-results .hint {
    display: inline-block;
    padding: var(--space-md) var(--space-xl);
    background: rgba(250, 204, 21, 0.1);
    border: 1px solid var(--accent-yellow);
    color: var(--accent-yellow);
    font-family: var(--font-body);
    font-size: 0.875rem;
}

/* ═══════════════════════════════════════════════════════════════════════════
   INFO SECTION - Technical Documentation
   ═══════════════════════════════════════════════════════════════════════════ */

.info-section {
    background: var(--bg-card);
    border: var(--border-strong);
    border-radius: 0;
    padding: var(--space-2xl);
    margin: var(--space-2xl) 0;
    box-shadow: var(--shadow-inset);
}

.info-section h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--chrome-light);
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-md);
    border-bottom: 2px solid var(--chrome);
    position: relative;
}

.info-section h3::before {
    content: '📋';
    margin-right: var(--space-sm);
    font-size: 1.5rem;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
}

.info-card {
    background: rgba(192, 192, 192, 0.03);
    border: 1px solid var(--chrome-dim);
    border-left: 3px solid var(--chrome);
    padding: var(--space-lg);
    position: relative;
    transition: all 0.2s var(--ease-mechanical);
}

.info-card:hover {
    border-left-color: var(--accent-yellow);
    background: rgba(250, 204, 21, 0.02);
    transform: translateX(4px);
}

.info-card h4 {
    font-family: var(--font-display);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent-yellow);
    margin-bottom: var(--space-md);
}

.info-card p,
.info-card li {
    color: var(--text-secondary);
    font-size: 0.938rem;
    line-height: 1.7;
    margin-bottom: var(--space-sm);
}

.info-card code {
    background: rgba(192, 192, 192, 0.1);
    padding: 0.25rem 0.5rem;
    border-radius: 0;
    font-family: var(--font-body);
    font-size: 0.813rem;
    color: var(--chrome-light);
    border: 1px solid var(--chrome-dim);
}

/* Links */
.tnpf-link,
.tnpf-pdf-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: rgba(192, 192, 192, 0.05);
    border: 1px solid var(--chrome);
    color: var(--chrome-light);
    text-decoration: none;
    font-family: var(--font-body);
    font-size: 0.875rem;
    transition: all 0.2s var(--ease-mechanical);
    margin-top: var(--space-sm);
}

.tnpf-link:hover,
.tnpf-pdf-link:hover {
    background: rgba(250, 204, 21, 0.1);
    border-color: var(--accent-yellow);
    color: var(--accent-yellow);
    transform: translateY(-1px);
}

/* ═══════════════════════════════════════════════════════════════════════════
   FEEDBACK SECTION - Industrial Form
   ═══════════════════════════════════════════════════════════════════════════ */

.feedback-section {
    background: var(--bg-card);
    border: var(--border-strong);
    border-radius: 0;
    padding: var(--space-2xl);
    margin: var(--space-2xl) 0;
    box-shadow: var(--shadow-inset);
}

.feedback-section h3 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--chrome-light);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 2px solid var(--chrome);
}

.feedback-section h3::before {
    content: '📝';
    margin-right: var(--space-sm);
}

.feedback-section > p {
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    font-family: var(--font-body);
}

.form-group {
    margin-bottom: var(--space-xl);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-sm);
    font-weight: 600;
    color: var(--chrome-light);
    font-family: var(--font-display);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.875rem;
}

.form-group input[type="email"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--space-md);
    background: var(--tire-black);
    border: 2px solid var(--chrome);
    border-radius: 0;
    color: var(--chrome-light);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: all 0.2s var(--ease-mechanical);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-yellow);
    box-shadow: 0 0 0 3px rgba(250, 204, 21, 0.15);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.feedback-section button[type="submit"] {
    padding: 1rem 2.5rem;
    background: linear-gradient(180deg, var(--chrome) 0%, #a0a0a0 100%);
    border: none;
    border-radius: 0;
    color: var(--tire-black);
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: all 0.1s var(--ease-mechanical);
    box-shadow:
        0 4px 0 #808080,
        inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.feedback-section button[type="submit"]:hover {
    transform: translateY(-2px);
    box-shadow:
        0 6px 0 #808080,
        inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.feedback-section button[type="submit"]:active {
    transform: translateY(2px);
    box-shadow:
        0 2px 0 #808080,
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.feedback-note {
    margin-top: var(--space-xl);
    padding: var(--space-md);
    background: rgba(249, 115, 22, 0.1);
    border-left: 4px solid var(--warning-orange);
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 0.875rem;
}

.feedback-note strong {
    color: var(--warning-orange);
}

/* ═══════════════════════════════════════════════════════════════════════════
   FOOTER - Industrial
   ═══════════════════════════════════════════════════════════════════════════ */

footer {
    background: var(--tire-black);
    padding: var(--space-2xl) var(--space-md);
    text-align: center;
    color: var(--chrome-dim);
    font-family: var(--font-body);
    font-size: 0.875rem;
    border-top: 4px solid var(--chrome);
}

.footer-links a {
    display: inline-block;
    padding: var(--space-sm) var(--space-md);
    margin-top: var(--space-md);
    background: rgba(192, 192, 192, 0.05);
    border: 1px solid var(--chrome-dim);
    color: var(--chrome);
    text-decoration: none;
    font-family: var(--font-display);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.875rem;
    transition: all 0.2s var(--ease-mechanical);
}

.footer-links a:hover {
    background: rgba(250, 204, 21, 0.1);
    border-color: var(--accent-yellow);
    color: var(--accent-yellow);
    transform: translateY(-1px);
}

/* ═══════════════════════════════════════════════════════════════════════════
   LOADING SPINNER - Industrial
   ═══════════════════════════════════════════════════════════════════════════ */

.loading {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.98);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    backdrop-filter: blur(10px);
}

.loading.hidden {
    display: none;
}

.spinner {
    width: 80px;
    height: 80px;
    border: 6px solid rgba(192, 192, 192, 0.1);
    border-top-color: var(--accent-yellow);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--space-xl);
    box-shadow:
        0 0 30px rgba(250, 204, 21, 0.3),
        inset 0 0 20px rgba(0, 0, 0, 0.3);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading p {
    color: var(--chrome-light);
    font-family: var(--font-body);
    font-size: 1rem;
    margin-bottom: var(--space-sm);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.loading-hint {
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 0.875rem;
    padding: var(--space-md) var(--space-xl);
    background: rgba(192, 192, 192, 0.05);
    border: 1px solid var(--chrome-dim);
}

/* ═══════════════════════════════════════════════════════════════════════════
   DARK MODE TOGGLE - Industrial
   ═══════════════════════════════════════════════════════════════════════════ */

.dark-mode-toggle {
    position: absolute;
    right: var(--space-lg);
    top: 50%;
    transform: translateY(-50%);
    background: rgba(192, 192, 192, 0.1);
    border: 2px solid var(--chrome);
    border-radius: 0;
    padding: var(--space-sm) var(--space-md);
    cursor: pointer;
    transition: all 0.2s var(--ease-mechanical);
    min-width: 3.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.dark-mode-toggle:hover {
    background: rgba(250, 204, 21, 0.1);
    border-color: var(--accent-yellow);
    transform: translateY(-50%) scale(1.05);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.4);
}

.dark-mode-toggle .icon-moon { display: none; }
.dark-mode-toggle .icon-sun { display: block; color: var(--chrome-light); }

[data-theme="light"] .dark-mode-toggle .icon-moon { display: block; }
[data-theme="light"] .dark-mode-toggle .icon-sun { display: none; }

/* ═══════════════════════════════════════════════════════════════════════════
   MOBILE RESPONSIVE
   ═══════════════════════════════════════════════════════════════════════════ */

@media (max-width: 768px) {
    .hero-header {
        min-height: 40vh;
        padding: var(--space-sm) var(--space-md);
    }

    .main-title {
        font-size: clamp(2rem, 8vw, 3rem);
    }

    .logo-container {
        width: 80px;
        height: 80px;
    }

    .tagline-line {
        font-size: 0.75rem;
        letter-spacing: 0.1em;
    }

    .decorative-line {
        display: none;
    }

    .input-group {
        flex-direction: column;
    }

    .input-group button {
        width: 100%;
    }

    .equivalences-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .filter-group {
        flex-wrap: wrap;
        gap: var(--space-md);
    }

    .equivalence-card {
        padding: var(--space-md);
    }

    .card-header {
        flex-direction: column;
        gap: var(--space-sm);
    }

    .original-tire {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-md);
    }

    .dark-mode-toggle {
        position: relative;
        right: auto;
        top: auto;
        transform: none;
        margin-top: var(--space-md);
    }
}

@media (max-width: 480px) {
    .hero-header {
        min-height: 40vh;
    }

    .main-title {
        font-size: 2rem;
        letter-spacing: 0.05em;
    }

    .logo-container {
        width: 80px;
        height: 80px;
    }

    .wheel-logo {
        animation-duration: 6s; /* Slower on weak devices */
    }

    .equivalence-card {
        padding: var(--space-md);
        font-size: 0.875rem;
    }

    .equivalence-card .size {
        font-size: 1.25rem;
    }

    .equivalences-header h2 {
        font-size: 1rem;
    }

    .filter-group {
        font-size: 0.75rem;
    }
}

/* ═══════════════════════════════════════════════════════════════════════════
   ACCESSIBILITY - Industrial
   ═══════════════════════════════════════════════════════════════════════════ */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .wheel-logo {
        transform: rotate(0deg);
    }
}

@media (prefers-contrast: high) {
    :root {
        --chrome-light: #ffffff;
        --chrome-dim: #cccccc;
        --chrome: #aaaaaa;
    }
}

/* Skip link for keyboard navigation */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--accent-yellow);
    color: var(--tire-black);
    padding: 8px 16px;
    z-index: 10000;
    font-family: var(--font-display);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-size: 0.875rem;
    transition: top 0.3s var(--ease-mechanical);
}

.skip-link:focus {
    top: 0;
}

/* Enhanced focus for keyboard users */
*:focus-visible {
    outline: 2px solid var(--accent-yellow);
    outline-offset: 2px;
}

/* Custom scrollbar (industrial style) */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--tire-black);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--chrome) 0%, var(--chrome-dim) 100%);
    border: 2px solid var(--tire-black);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--chrome-light) 0%, var(--chrome) 100%);
}

/* ═══════════════════════════════════════════════════════════════════════════
   UTILITIES
   ═══════════════════════════════════════════════════════════════════════════ */

.hidden {
    display: none !important;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Performance optimization */
@media (prefers-reduced-data: reduce) {
    .wheel-logo {
        animation: none;
    }
}

/* Print styles */
@media print {
    body::before,
    body::after,
    .dark-mode-toggle,
    .decorative-line {
        display: none !important;
    }

    .hero-header {
        min-height: auto;
        background: white;
        color: black;
    }

    .equivalence-card {
        break-inside: avoid;
        page-break-inside: avoid;
    }
}

/* Theme Switcher Button - Industrial */
.theme-switcher {
    position: absolute;
    right: 8rem;
    top: 50%;
    transform: translateY(-50%);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(192, 192, 192, 0.1);
    border: 2px solid var(--chrome);
    border-radius: 0; /* Sharp corners - industrial aesthetic */
    cursor: pointer;
    transition: all 0.2s var(--ease-mechanical);
    font-size: 1.2rem;
    z-index: 100;
    text-decoration: none;
    color: var(--chrome-light);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.theme-switcher:hover {
    background: rgba(250, 204, 21, 0.1);
    border-color: var(--accent-yellow);
    transform: translateY(-50%) scale(1.1);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.4);
    color: var(--accent-yellow);
}

/* Mobile responsive */
@media (max-width: 768px) {
    .theme-switcher {
        position: relative;
        right: auto;
        top: auto;
        transform: none;
        margin-top: 0.5rem;
    }

    .theme-switcher:hover {
        transform: scale(1.05);
    }
}