/**
 * RWC Motorsport - Turbo Guide Styles
 * Loaded only on turbo-guide pages via $extraCSS
 */

/* Chapter Navigation - Sticky horizontal pill nav */
.chapter-nav {
    position: sticky;
    top: var(--nav-height);
    z-index: 90;
    background: var(--bg-darker);
    border-bottom: 1px solid var(--border-subtle);
    padding: 12px 0;
    transition: box-shadow 0.2s;
}
.chapter-nav.scrolled {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}
.chapter-nav-inner {
    display: flex;
    gap: 6px;
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    padding: 0 4px;
}
.chapter-nav-inner::-webkit-scrollbar { display: none; }
.chapter-nav-link {
    flex-shrink: 0;
    padding: 6px 14px;
    font-family: var(--font-heading);
    font-size: 13px;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--text-muted);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    transition: all 0.2s;
    white-space: nowrap;
}
.chapter-nav-link:hover {
    color: var(--text-white);
    border-color: var(--text-dim);
}
.chapter-nav-link.active {
    color: var(--primary);
    border-color: var(--primary);
    background: var(--primary-glow);
}

/* Chapter sections */
.turbo-guide-content {
    padding-bottom: 60px;
}
.chapter {
    padding: 60px 0 40px;
    border-bottom: 1px solid var(--border-subtle);
}
.chapter:last-child { border-bottom: none; }
.chapter-number {
    font-family: var(--font-heading);
    font-size: 13px;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--primary);
    margin-bottom: 8px;
}
.chapter h2 {
    font-size: clamp(28px, 4vw, 48px);
    margin-bottom: 24px;
}
.chapter-intro {
    font-size: 18px;
    color: var(--text-light);
    max-width: 800px;
    line-height: 1.7;
    margin-bottom: 32px;
}

/* Content prose within chapters */
.chapter-body {
    max-width: 800px;
    line-height: 1.8;
    color: var(--text-light);
}
.chapter-body h3 {
    font-size: clamp(20px, 3vw, 28px);
    margin: 40px 0 16px;
    letter-spacing: 2px;
}
.chapter-body h4 {
    font-size: 18px;
    font-family: var(--font-heading);
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--primary);
    margin: 32px 0 12px;
}
.chapter-body p {
    margin-bottom: 16px;
}
.chapter-body ul, .chapter-body ol {
    margin: 0 0 16px 24px;
}
.chapter-body li {
    margin-bottom: 8px;
}
.chapter-body strong {
    color: var(--text-white);
}

/* Roger's perspective callout */
.builder-note {
    border-left: 3px solid var(--primary);
    padding: 16px 20px;
    margin: 24px 0;
    background: var(--primary-glow);
    border-radius: 0 4px 4px 0;
    font-style: italic;
    color: var(--text-light);
}
.builder-note::before {
    content: 'FROM THE BUILDER';
    display: block;
    font-family: var(--font-heading);
    font-size: 11px;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--primary);
    font-style: normal;
    margin-bottom: 8px;
}

/* Technical illustration with label overlay container */
.turbo-img {
    position: relative;
    margin: 32px 0;
    border-radius: 8px;
    overflow: hidden;
    background: #0d0f1a;
}
.turbo-img img {
    width: 100%;
    height: auto;
    display: block;
}
.turbo-img-caption {
    padding: 12px 16px;
    font-size: 13px;
    color: var(--text-muted);
    background: rgba(0, 0, 0, 0.4);
    font-family: var(--font-heading);
    letter-spacing: 1px;
}

/* Interactive graph iframe container */
.graph-container {
    margin: 32px 0;
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    overflow: hidden;
    background: var(--bg-darker);
}
.graph-container iframe {
    width: 100%;
    border: none;
    min-height: 400px;
}
.graph-container-label {
    padding: 10px 16px;
    font-family: var(--font-heading);
    font-size: 12px;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--text-dim);
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid var(--border-subtle);
}

/* Spec comparison tables within chapters */
.turbo-table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 14px;
}
.turbo-table th {
    font-family: var(--font-heading);
    font-size: 12px;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--text-muted);
    padding: 10px 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-subtle);
    white-space: nowrap;
}
.turbo-table td {
    padding: 10px 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    color: var(--text-light);
}
.turbo-table tr:hover td {
    background: rgba(255, 255, 255, 0.02);
}

/* FAQ section using <details> */
.chapter-faq {
    margin-top: 40px;
    padding-top: 24px;
    border-top: 1px solid var(--border-subtle);
}
.chapter-faq-title {
    font-family: var(--font-heading);
    font-size: 14px;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 16px;
}
.faq-item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}
.faq-item summary {
    padding: 14px 0;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-white);
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.faq-item summary::after {
    content: '+';
    font-size: 20px;
    color: var(--primary);
    transition: transform 0.2s;
}
.faq-item[open] summary::after {
    content: '-';
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item .faq-answer {
    padding: 0 0 16px;
    color: var(--text-light);
    line-height: 1.7;
}

/* Affiliate product cards */
.product-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    border: 1px solid var(--border-subtle);
    border-radius: 6px;
    margin: 12px 0;
    transition: border-color 0.2s;
}
.product-card:hover {
    border-color: var(--primary);
}
.product-card-info {
    flex: 1;
}
.product-card-name {
    font-weight: 600;
    color: var(--text-white);
    margin-bottom: 4px;
}
.product-card-detail {
    font-size: 13px;
    color: var(--text-muted);
}
.product-card-link {
    flex-shrink: 0;
    padding: 8px 16px;
    background: var(--primary);
    color: var(--text-white);
    font-family: var(--font-heading);
    font-size: 12px;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    border-radius: 4px;
    transition: background 0.2s;
}
.product-card-link:hover {
    background: var(--primary-dark);
}

/* Stage progression cards (for sub-pages) */
.stage-card {
    margin: 40px 0;
    padding: 24px;
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    background: var(--bg-card);
}
.stage-card-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 16px;
}
.stage-card-title {
    font-family: var(--font-display);
    font-size: clamp(24px, 3vw, 36px);
    letter-spacing: 2px;
}
.stage-card-power {
    font-family: var(--font-heading);
    font-size: 14px;
    letter-spacing: 1px;
    color: var(--primary);
}
.stage-card-body {
    color: var(--text-light);
    line-height: 1.7;
}

/* Engine sub-page navigation */
.engine-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 24px 0;
}
.engine-nav-link {
    padding: 8px 16px;
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    font-family: var(--font-heading);
    font-size: 13px;
    letter-spacing: 1px;
    color: var(--text-muted);
    transition: all 0.2s;
}
.engine-nav-link:hover {
    color: var(--text-white);
    border-color: var(--text-dim);
}
.engine-nav-link.current {
    color: var(--primary);
    border-color: var(--primary);
    background: var(--primary-glow);
}

/* Mobile responsive */
@media (max-width: 768px) {
    .chapter { padding: 40px 0 30px; }
    .chapter-body { font-size: 15px; }
    .chapter-nav-link { font-size: 11px; padding: 5px 10px; }
    .product-card { flex-direction: column; align-items: stretch; text-align: center; }
    .stage-card-header { flex-direction: column; gap: 4px; }
    .turbo-table { font-size: 13px; }
    .turbo-table th, .turbo-table td { padding: 8px; }
    .builder-note { padding: 12px 14px; font-size: 14px; }

    /* Mobile chapter accordion */
    .chapter.collapsed .chapter-body,
    .chapter.collapsed .chapter-faq,
    .chapter.collapsed .turbo-img,
    .chapter.collapsed .graph-container {
        display: none;
    }
    .chapter-toggle {
        display: inline-block;
        font-family: var(--font-heading);
        font-size: 12px;
        letter-spacing: 1.5px;
        color: var(--primary);
        cursor: pointer;
        padding: 4px 0;
    }
}
@media (min-width: 769px) {
    .chapter-toggle { display: none; }
}