/**
 * RWC Motorsport - Stylesheet
 * German Tuning Aesthetic: Dark theme, Orange accents (#FF4D00)
 */

:root {
    --primary: #FF4D00;
    --primary-dark: #CC3D00;
    --primary-glow: rgba(255, 77, 0, 0.15);
    --bg-dark: #0A0A0A;
    --bg-darker: #080808;
    --bg-card: rgba(255, 255, 255, 0.02);
    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-primary: rgba(255, 77, 0, 0.2);
    --text-white: #FFFFFF;
    --text-light: #CCCCCC;
    --text-muted: #888888;
    --text-dim: #757575;
    --text-faint: #6b6b6b;
    --font-display: 'Bebas Neue', Impact, sans-serif;
    --font-heading: 'Barlow Condensed', Arial Narrow, sans-serif;
    --font-body: 'Barlow', Arial, sans-serif;
    --nav-height: 70px;
    --container-max: 1200px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    background: var(--bg-dark);
    color: var(--text-white);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* Typography */
h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 400;
    letter-spacing: 3px;
    line-height: 1.1;
}
h1 { font-size: clamp(40px, 8vw, 80px); }
h2 { font-size: clamp(32px, 5vw, 56px); }
h3 { font-size: clamp(24px, 4vw, 40px); }
h4 { font-size: clamp(20px, 3vw, 28px); }

.section-tag {
    font-family: var(--font-heading);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 3px;
    color: var(--primary);
    text-transform: uppercase;
    margin-bottom: 12px;
}

/* Layout */
.container { width: 100%; max-width: var(--container-max); margin: 0 auto; padding: 0 24px; }
.section { padding: clamp(40px, 8vw, 80px) 0; }

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-subtle);
    z-index: 1000;
    display: flex;
    align-items: center;
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

.logo { display: flex; align-items: center; gap: 16px; }
.logo-rwc { font-family: var(--font-display); font-size: 32px; letter-spacing: 4px; }
.logo-rwc .r, .logo-rwc .c { color: var(--primary); }
.logo-rwc .w { color: var(--text-white); }
.logo-divider { width: 1px; height: 36px; background: var(--border-subtle); }
.logo-text { display: flex; flex-direction: column; gap: 2px; }
.logo-motorsport { font-family: var(--font-heading); font-size: 14px; font-weight: 600; letter-spacing: 4px; }
.logo-tagline { font-family: var(--font-heading); font-size: 10px; letter-spacing: 2px; color: var(--text-dim); }

.nav-links { display: flex; gap: 8px; }
.nav-link {
    font-family: var(--font-heading);
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 2px;
    color: var(--text-muted);
    padding: 10px 16px;
    transition: all 0.2s ease;
    position: relative;
}
.nav-link:hover { color: var(--text-white); }
.nav-link.active { color: var(--primary); }
.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--primary);
}

.nav-right { display: flex; align-items: center; gap: 16px; }
.search-box { position: relative; }
.search-input {
    font-family: var(--font-body);
    font-size: 13px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-subtle);
    color: var(--text-white);
    padding: 10px 40px 10px 16px;
    width: 200px;
    transition: all 0.2s ease;
}
.search-input::placeholder { color: var(--text-muted); }
.search-input:focus { outline: none; border-color: var(--primary); width: 260px; }
.search-icon { position: absolute; right: 14px; top: 50%; transform: translateY(-50%); color: var(--text-dim); }

.mobile-menu-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.mobile-menu-toggle span { width: 24px; height: 2px; background: var(--text-white); transition: all 0.2s; }

.mobile-menu {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-darker);
    border-bottom: 1px solid var(--border-subtle);
    padding: 16px;
    z-index: 999;
}
.mobile-menu.open { display: block; }
.mobile-nav-link {
    display: block;
    font-family: var(--font-heading);
    font-size: 14px;
    letter-spacing: 2px;
    color: var(--text-muted);
    padding: 12px 0;
    border-bottom: 1px solid var(--border-subtle);
}

/* Buttons */
.btn {
    font-family: var(--font-heading);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 2px;
    padding: 14px 28px;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}
.btn-primary { background: var(--primary); color: var(--text-white); }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); }
.btn-outline { background: transparent; border: 1px solid var(--border-subtle); color: var(--text-white); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-amazon { background: #FF9900; color: #000; }
.btn-amazon:hover { background: #FFAC31; }

/* Hero */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding-top: var(--nav-height);
    background: 
        linear-gradient(180deg, rgba(0,0,0,0.8) 0%, var(--bg-dark) 100%),
        radial-gradient(ellipse at 30% 20%, var(--primary-glow) 0%, transparent 50%);
}
.hero-content { text-align: center; position: relative; z-index: 1; }
.hero-tag { font-family: var(--font-heading); font-size: 12px; letter-spacing: 4px; color: var(--primary); margin-bottom: 24px; }
.hero-title { margin-bottom: 24px; }
.hero-title-line { display: block; }
.hero-title-line:nth-child(2) { color: var(--primary); }
.hero-german { font-size: 14px; font-style: italic; color: var(--text-dim); margin-bottom: 24px; letter-spacing: 1px; }
.hero-subtitle { font-size: 16px; color: var(--text-muted); max-width: 500px; margin: 0 auto 40px; line-height: 1.8; }
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* Page Header */
.page-header {
    padding: calc(var(--nav-height) + 60px) 0 60px;
    background: linear-gradient(180deg, rgba(0,0,0,0.9) 0%, var(--bg-dark) 100%),
                radial-gradient(ellipse at 30% 0%, var(--primary-glow) 0%, transparent 50%);
    border-bottom: 1px solid var(--border-primary);
}
.page-header h1 { margin-bottom: 16px; }
.page-header-subtitle { font-size: 16px; color: var(--text-muted); max-width: 600px; }

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    padding: 24px;
    transition: all 0.3s ease;
}
.card:hover { border-color: var(--border-primary); transform: translateY(-4px); }
.card-primary { background: rgba(255, 77, 0, 0.03); border-color: var(--border-primary); }

.category-card { padding: 32px 24px; text-align: center; }
.category-icon { margin-bottom: 16px; color: var(--primary); display: flex; align-items: center; justify-content: center; }
.category-icon svg { width: 32px; height: 32px; }
.category-name { font-family: var(--font-heading); font-size: 16px; font-weight: 600; letter-spacing: 2px; margin-bottom: 8px; }
.category-count { font-family: var(--font-display); font-size: 28px; color: var(--primary); letter-spacing: 2px; }
.category-label { font-size: 10px; color: var(--text-dim); letter-spacing: 2px; }

/* Grids */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-6 { grid-template-columns: repeat(6, 1fr); }

/* Stats Row */
.stats-row { display: flex; gap: 48px; justify-content: center; flex-wrap: wrap; margin: 40px 0; }
.stat-item { text-align: center; }
.stat-value { font-family: var(--font-display); font-size: 48px; color: var(--primary); letter-spacing: 2px; }
.stat-label { font-family: var(--font-heading); font-size: 12px; letter-spacing: 2px; color: var(--text-dim); }

/* Engine/Trans Cards */
.engine-family { margin-bottom: 48px; }
.family-header {
    padding: 24px;
    background: linear-gradient(90deg, rgba(255, 77, 0, 0.1) 0%, transparent 100%);
    border-left: 3px solid var(--primary);
    margin-bottom: 24px;
}
.family-name { font-family: var(--font-display); font-size: 32px; letter-spacing: 3px; margin-bottom: 8px; }
.family-desc { font-size: 14px; color: var(--text-muted); }

.engine-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    margin-bottom: 16px;
    overflow: hidden;
}
.engine-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    background: rgba(0, 0, 0, 0.3);
    cursor: pointer;
}
.engine-header:hover { background: rgba(255, 77, 0, 0.05); }
.engine-code { font-family: var(--font-display); font-size: 28px; letter-spacing: 3px; color: var(--primary); }
.engine-name { font-family: var(--font-heading); font-size: 14px; letter-spacing: 1px; color: var(--text-muted); }
.engine-toggle { color: var(--text-muted); font-size: 20px; transition: transform 0.3s; }
.engine-card.open .engine-toggle { transform: rotate(180deg); }
.engine-body { padding: 24px; display: none; }
.engine-card.open .engine-body { display: block; }

.spec-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 16px; margin-bottom: 24px; }
.spec-item { background: rgba(0,0,0,0.3); padding: 16px; }
.spec-label { font-family: var(--font-heading); font-size: 10px; letter-spacing: 2px; color: var(--text-dim); margin-bottom: 4px; }
.spec-value { font-family: var(--font-display); font-size: 20px; letter-spacing: 1px; color: var(--primary); }

/* Engine Detail Sections */
.engine-section {
    margin-top: 32px;
    padding-top: 32px;
    border-top: 1px solid var(--border-subtle);
}
.engine-section-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}
.engine-section-icon {
    width: 36px;
    height: 36px;
    background: rgba(255, 77, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    flex-shrink: 0;
}
.engine-section-title {
    font-family: var(--font-display);
    font-size: 22px;
    letter-spacing: 3px;
    color: var(--text-white);
}

/* Detailed Spec Table */
.detail-spec-table {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    border: 1px solid var(--border-subtle);
}
.detail-spec-row {
    display: flex;
    border-bottom: 1px solid var(--border-subtle);
}
.detail-spec-row:last-child { border-bottom: none; }
.detail-spec-label {
    width: 200px;
    flex-shrink: 0;
    padding: 10px 16px;
    font-family: var(--font-heading);
    font-size: 12px;
    letter-spacing: 1px;
    color: var(--text-dim);
    background: rgba(0, 0, 0, 0.3);
}
.detail-spec-value {
    flex: 1;
    padding: 10px 16px;
    font-size: 13px;
    color: var(--text-light);
}

/* Variant Table */
.variant-table-wrap { overflow-x: auto; margin-bottom: 16px; }
.variant-table, .torque-table, .parts-ref-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
.variant-table th, .torque-table th, .parts-ref-table th {
    font-family: var(--font-heading);
    font-size: 11px;
    letter-spacing: 2px;
    color: var(--text-dim);
    background: rgba(0, 0, 0, 0.4);
    padding: 12px 14px;
    text-align: left;
    white-space: nowrap;
}
.variant-table td, .torque-table td, .parts-ref-table td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-subtle);
    color: var(--text-light);
}
.variant-table tr:hover td, .torque-table tr:hover td, .parts-ref-table tr:hover td {
    background: rgba(255, 77, 0, 0.03);
}
.variant-code {
    font-family: var(--font-display);
    font-size: 18px;
    letter-spacing: 2px;
    color: var(--primary);
}
.variant-notes { margin-top: 16px; }
.variant-note-item {
    font-size: 13px;
    color: var(--text-muted);
    padding: 6px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}
.variant-note-code {
    font-family: var(--font-heading);
    font-weight: 600;
    letter-spacing: 1px;
    color: var(--primary);
    margin-right: 6px;
}

/* Torque Specs */
.torque-group { margin-bottom: 24px; }
.torque-group-title {
    font-family: var(--font-heading);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--text-white);
    padding: 10px 16px;
    background: linear-gradient(90deg, rgba(255, 77, 0, 0.08) 0%, transparent 100%);
    border-left: 2px solid var(--primary);
    margin-bottom: 0;
}
.torque-value {
    font-family: var(--font-heading);
    font-weight: 600;
    color: var(--text-white);
    white-space: nowrap;
}
.torque-notes { font-size: 12px; color: var(--text-muted); }

/* Failure Points */
.failure-list { display: flex; flex-direction: column; gap: 16px; }
.failure-item {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-subtle);
    padding: 20px;
    border-left: 3px solid var(--border-subtle);
}
.failure-item.failure-critical { border-left-color: #FF3333; }
.failure-item.failure-high { border-left-color: #FF9900; }
.failure-item.failure-medium { border-left-color: #FFCC00; }
.failure-item.failure-low { border-left-color: #66CC66; }
.failure-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 8px;
}
.failure-component {
    font-family: var(--font-heading);
    font-size: 16px;
    font-weight: 600;
    letter-spacing: 1px;
    color: var(--text-white);
}
.failure-badges { display: flex; gap: 8px; align-items: center; }
.failure-severity {
    font-family: var(--font-heading);
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 2px;
    padding: 3px 10px;
}
.severity-critical { background: rgba(255, 51, 51, 0.2); color: #FF3333; }
.severity-high { background: rgba(255, 153, 0, 0.2); color: #FF9900; }
.severity-medium { background: rgba(255, 204, 0, 0.2); color: #FFCC00; }
.severity-low { background: rgba(102, 204, 102, 0.2); color: #66CC66; }
.failure-mileage {
    font-family: var(--font-heading);
    font-size: 11px;
    letter-spacing: 1px;
    color: var(--text-dim);
}
.failure-details { display: flex; flex-direction: column; gap: 6px; }
.failure-detail-row { font-size: 13px; color: var(--text-light); line-height: 1.5; }
.failure-label {
    font-family: var(--font-heading);
    font-size: 11px;
    letter-spacing: 1px;
    color: var(--text-dim);
    margin-right: 8px;
    display: inline-block;
    min-width: 80px;
}

/* Mod Tiers */
.mod-tiers { display: flex; flex-direction: column; gap: 24px; }
.mod-tier {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-subtle);
    padding: 24px;
    position: relative;
    overflow: hidden;
}
.mod-tier::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary) 0%, transparent 100%);
}
.mod-tier-header {
    display: flex;
    align-items: baseline;
    gap: 16px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}
.mod-tier-name {
    font-family: var(--font-display);
    font-size: 28px;
    letter-spacing: 3px;
    color: var(--primary);
}
.mod-tier-power {
    font-family: var(--font-heading);
    font-size: 16px;
    font-weight: 600;
    letter-spacing: 1px;
    color: var(--text-white);
}
.mod-tier-turbo {
    font-size: 13px;
    color: var(--text-muted);
}
.mod-tier-desc {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 20px;
}
.mod-tier-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 16px;
}
.mod-col-title {
    font-family: var(--font-heading);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--text-dim);
    margin-bottom: 10px;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--border-subtle);
}
.mod-list {
    list-style: none;
    padding: 0;
    margin: 0;
}
.mod-list li {
    font-size: 13px;
    color: var(--text-light);
    padding: 5px 0 5px 16px;
    position: relative;
    line-height: 1.5;
}
.mod-list li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-size: 11px;
}
.mod-list-supporting li::before {
    color: var(--text-dim);
}
.mod-tier-notes {
    font-size: 13px;
    color: var(--text-muted);
    padding: 12px 16px;
    background: rgba(255, 77, 0, 0.05);
    border-left: 2px solid var(--primary);
    display: flex;
    align-items: flex-start;
    gap: 8px;
}
.mod-tier-notes svg { flex-shrink: 0; color: var(--primary); margin-top: 2px; }

/* Heritage Page */
.heritage-content { max-width: 800px; }
.heritage-content h2 {
    margin-bottom: 24px;
    line-height: 1.15;
}
.heritage-text { margin-bottom: 32px; }
.heritage-text p {
    font-size: 15px;
    line-height: 1.8;
    color: var(--text-light);
    margin-bottom: 20px;
}
.heritage-text p:last-child { margin-bottom: 0; }
.heritage-specs-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-top: 32px;
}
.heritage-spec-card {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-subtle);
    padding: 20px;
    text-align: center;
}
.heritage-spec-value {
    font-family: var(--font-display);
    font-size: 32px;
    color: var(--primary);
    letter-spacing: 2px;
    margin-bottom: 4px;
}
.heritage-spec-label {
    font-family: var(--font-heading);
    font-size: 10px;
    letter-spacing: 2px;
    color: var(--text-dim);
}
.heritage-cta {
    display: flex;
    gap: 16px;
    margin-top: 32px;
    flex-wrap: wrap;
}

/* Timeline */
.timeline { max-width: 800px; margin: 0 auto; }
.timeline-item {
    display: flex;
    gap: 24px;
    padding: 24px 0;
    border-bottom: 1px solid var(--border-subtle);
}
.timeline-item:last-child { border-bottom: none; }
.timeline-year {
    font-family: var(--font-display);
    font-size: 36px;
    color: var(--primary);
    letter-spacing: 2px;
    flex-shrink: 0;
    width: 90px;
}
.timeline-content { flex: 1; }
.timeline-title {
    font-family: var(--font-heading);
    font-size: 16px;
    font-weight: 600;
    letter-spacing: 1px;
    color: var(--text-white);
    margin-bottom: 6px;
}
.timeline-desc {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.6;
}

/* Parts Table */
.parts-table { width: 100%; border-collapse: collapse; }
.parts-table th, .parts-table td { padding: 16px; text-align: left; border-bottom: 1px solid var(--border-subtle); }
.parts-table th {
    font-family: var(--font-heading);
    font-size: 11px;
    letter-spacing: 2px;
    color: var(--text-dim);
    background: var(--bg-darker);
    text-transform: uppercase;
}
.parts-table td { font-size: 14px; color: var(--text-light); }
.parts-table tr:hover td { background: var(--bg-card); }
.part-number { font-family: var(--font-heading); font-size: 14px; font-weight: 600; letter-spacing: 1px; color: var(--primary); }
.part-amazon { display: inline-flex; align-items: center; gap: 6px; background: #FF9900; color: #000; padding: 6px 12px; font-size: 11px; font-weight: 600; letter-spacing: 1px; }
.part-amazon:hover { background: #FFAC31; }

/* Tech Guide Cards */
.guide-card { display: flex; gap: 20px; padding: 24px; }
.guide-icon { flex-shrink: 0; width: 48px; height: 48px; background: rgba(255, 77, 0, 0.1); display: flex; align-items: center; justify-content: center; color: var(--primary); }
.guide-content { flex: 1; }
.guide-title { font-family: var(--font-heading); font-size: 16px; font-weight: 600; letter-spacing: 1px; margin-bottom: 8px; }
.guide-desc { font-size: 13px; color: var(--text-muted); line-height: 1.6; margin-bottom: 12px; }
.guide-meta { font-family: var(--font-heading); font-size: 11px; letter-spacing: 2px; color: var(--primary); }

/* Amazon Product Card */
.amazon-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    padding: 20px;
    display: flex;
    gap: 16px;
}
.amazon-card:hover { border-color: #FF9900; }
.amazon-img { width: 80px; height: 80px; object-fit: contain; background: #fff; }
.amazon-info { flex: 1; }
.amazon-title { font-size: 14px; margin-bottom: 8px; line-height: 1.4; }
.amazon-price { font-family: var(--font-display); font-size: 24px; color: #FF9900; margin-bottom: 8px; }
.amazon-btn { background: #FF9900; color: #000; padding: 8px 16px; font-family: var(--font-heading); font-size: 12px; font-weight: 600; letter-spacing: 1px; display: inline-block; }

/* Footer */
.footer { background: var(--bg-darker); border-top: 1px solid var(--border-subtle); padding: 48px 0 24px; }
.footer-inner { display: flex; justify-content: space-between; align-items: flex-start; flex-wrap: wrap; gap: 32px; margin-bottom: 32px; }
.footer-logo { font-family: var(--font-display); font-size: 18px; letter-spacing: 3px; margin-bottom: 8px; }
.footer-tagline { font-size: 11px; color: var(--text-dim); letter-spacing: 1px; font-style: italic; }
.footer-links { display: flex; flex-direction: column; gap: 8px; }
.footer-links a { font-size: 13px; color: var(--text-muted); transition: color 0.2s; }
.footer-links a:hover { color: var(--primary); }
.footer-right { text-align: right; }
.footer-doc { font-size: 11px; color: var(--text-dim); letter-spacing: 1px; }
.footer-sources { font-size: 10px; color: var(--text-faint); }
.footer-bottom { border-top: 1px solid var(--border-subtle); padding-top: 24px; text-align: center; }
.footer-bottom p { font-size: 12px; color: var(--text-dim); margin-bottom: 8px; }
.footer-affiliate { font-size: 11px; color: var(--text-faint); }

/* SVG Icons */
svg { vertical-align: middle; flex-shrink: 0; }
.btn svg { width: 16px; height: 16px; vertical-align: -2px; margin-right: 4px; }
.text-primary svg { color: var(--primary); }

/* Utilities */
.text-primary { color: var(--primary); }
.text-muted { color: var(--text-muted); }
.text-center { text-align: center; }
.mt-2 { margin-top: 16px; }
.mt-4 { margin-top: 32px; }
.mb-2 { margin-bottom: 16px; }
.mb-4 { margin-bottom: 32px; }

/* Responsive */
@media (max-width: 1024px) {
    .grid-6 { grid-template-columns: repeat(3, 1fr); }
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav-links, .search-box { display: none; }
    .mobile-menu-toggle { display: flex; }
    .logo-text { display: none; }
    .grid-6, .grid-4, .grid-3 { grid-template-columns: repeat(2, 1fr); }
    .grid-2 { grid-template-columns: 1fr; }
    .hero-title { font-size: clamp(32px, 10vw, 56px); }
    .stats-row { gap: 24px; }
    .stat-value { font-size: 36px; }
    .footer-inner { flex-direction: column; align-items: center; text-align: center; }
    .footer-right { text-align: center; }
    .detail-spec-table { grid-template-columns: 1fr; }
    .detail-spec-label { width: 160px; }
    .heritage-specs-row { grid-template-columns: repeat(2, 1fr); }
    .timeline-year { font-size: 28px; width: 70px; }
    .mod-tier-columns { grid-template-columns: 1fr; }
    .failure-header-row { flex-direction: column; align-items: flex-start; }
    .mod-tier-header { flex-direction: column; gap: 4px; }
    .engine-section-title { font-size: 18px; }
}

@media (max-width: 480px) {
    .grid-6, .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
    .hero-buttons { flex-direction: column; align-items: center; }
    .parts-table { font-size: 12px; }
    .parts-table th, .parts-table td { padding: 12px 8px; }
    .detail-spec-row { flex-direction: column; }
    .detail-spec-label { width: 100%; padding: 8px 12px 2px; font-size: 10px; }
    .detail-spec-value { padding: 2px 12px 8px; }
    .variant-table, .torque-table, .parts-ref-table { font-size: 11px; }
    .variant-table th, .torque-table th, .parts-ref-table th,
    .variant-table td, .torque-table td, .parts-ref-table td { padding: 8px 10px; }
    .mod-tier-name { font-size: 22px; }
    .failure-item { padding: 14px; }
}

/* Accessibility: Screen reader only */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }