/* THE PULSE OF BOSTON - EDITORIAL DESIGN SYSTEM */
/* Shared styles for all chapter pages */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;500;600;700;800&family=Source+Serif+4:opsz,wght@8..60,400;8..60,500;8..60,600&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

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

:root {
    --color-bg-dark: #0a0a0f;
    --color-bg-surface: #12121a;
    --color-bg-elevated: #1a1a24;
    --color-accent-blue: #4a9eff;
    --color-accent-gold: #d4a853;
    --color-accent-red: #ff4d6d;
    --color-accent-green: #00d4aa;
    --color-text-primary: #f5f5f7;
    --color-text-secondary: #a1a1a6;
    --color-text-muted: #636366;
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Source Serif 4', Georgia, serif;
    --font-ui: 'Inter', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

html {
    scroll-behavior: smooth;
}

body {
    background: var(--color-bg-dark);
    color: var(--color-text-primary);
    font-family: var(--font-body);
    line-height: 1.8;
    font-size: 18px;
}

/* ===== NAVIGATION ===== */
.nav-editorial {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 24px;
}

.nav-back {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-ui);
    font-size: 13px;
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color 0.2s;
}

.nav-back:hover {
    color: var(--color-text-primary);
}

.nav-series {
    font-family: var(--font-ui);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-accent-gold);
}

.nav-right {
    display: flex;
    gap: 24px;
}

.nav-link {
    font-family: var(--font-ui);
    font-size: 13px;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

.nav-link:hover {
    color: var(--color-text-primary);
}

/* ===== CHAPTER HERO ===== */
.chapter-hero {
    padding: 160px 40px 80px;
    max-width: 900px;
    margin: 0 auto;
}

.chapter-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.chapter-number {
    font-family: var(--font-display);
    font-size: 14px;
    font-weight: 700;
    color: var(--color-accent-blue);
    background: rgba(74, 158, 255, 0.1);
    padding: 6px 14px;
    border-radius: 20px;
}

.chapter-category {
    font-family: var(--font-ui);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text-muted);
}

.chapter-title {
    font-family: var(--font-display);
    font-size: clamp(40px, 6vw, 64px);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: 24px;
}

.chapter-subtitle {
    font-family: var(--font-body);
    font-size: 22px;
    color: var(--color-text-secondary);
    line-height: 1.6;
    max-width: 700px;
}

.chapter-info {
    display: flex;
    gap: 32px;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid rgba(255,255,255,0.08);
}

.info-item {
    font-family: var(--font-ui);
    font-size: 13px;
    color: var(--color-text-muted);
}

.info-item span {
    color: var(--color-text-secondary);
}

/* ===== ARTICLE CONTENT ===== */
.article-content {
    max-width: 720px;
    margin: 0 auto;
    padding: 60px 40px 100px;
}

.article-content h2 {
    font-family: var(--font-display);
    font-size: 32px;
    font-weight: 600;
    margin-top: 64px;
    margin-bottom: 24px;
    color: var(--color-text-primary);
}

.article-content h3 {
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 600;
    margin-top: 48px;
    margin-bottom: 16px;
    color: var(--color-text-primary);
}

.article-content p {
    margin-bottom: 24px;
    color: var(--color-text-secondary);
}

.article-content a {
    color: var(--color-accent-blue);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
}

.article-content a:hover {
    border-bottom-color: var(--color-accent-blue);
}

/* ===== PULL QUOTE ===== */
.pull-quote {
    font-family: var(--font-display);
    font-size: 28px;
    font-style: italic;
    line-height: 1.5;
    color: var(--color-text-primary);
    border-left: 3px solid var(--color-accent-gold);
    padding-left: 32px;
    margin: 48px 0;
}

/* ===== STATS GRID ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    margin: 48px 0;
}

.stat-card {
    background: var(--color-bg-surface);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: 12px;
    padding: 32px;
    text-align: center;
}

.stat-card .value {
    font-family: var(--font-display);
    font-size: 48px;
    font-weight: 700;
    color: var(--color-accent-gold);
    line-height: 1;
}

.stat-card .label {
    font-family: var(--font-ui);
    font-size: 12px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-top: 12px;
}

/* ===== DATA TABLE ===== */
.data-table {
    width: 100%;
    margin: 48px 0;
    border-collapse: collapse;
    font-family: var(--font-ui);
    font-size: 14px;
}

.data-table thead {
    background: var(--color-bg-surface);
}

.data-table th {
    padding: 16px 20px;
    text-align: left;
    font-weight: 600;
    color: var(--color-text-secondary);
    border-bottom: 2px solid rgba(255,255,255,0.1);
    font-size: 11px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.data-table td {
    padding: 16px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    color: var(--color-text-secondary);
}

.data-table tr:hover td {
    background: rgba(255,255,255,0.02);
}

.data-table .highlight {
    color: var(--color-accent-gold);
    font-weight: 600;
}

/* ===== CALLOUT BOX ===== */
.callout {
    background: var(--color-bg-surface);
    border-left: 3px solid var(--color-accent-blue);
    border-radius: 0 12px 12px 0;
    padding: 24px 32px;
    margin: 32px 0;
}

.callout.warning {
    border-left-color: var(--color-accent-gold);
}

.callout.important {
    border-left-color: var(--color-accent-red);
}

.callout-title {
    font-family: var(--font-ui);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-accent-blue);
    margin-bottom: 12px;
}

.callout.warning .callout-title {
    color: var(--color-accent-gold);
}

.callout p {
    margin-bottom: 0;
    font-size: 16px;
}

/* ===== CODE BLOCKS ===== */
.code-block {
    background: var(--color-bg-surface);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: 12px;
    padding: 24px;
    margin: 32px 0;
    overflow-x: auto;
}

.code-block code {
    font-family: var(--font-mono);
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ===== 3D VIEWER EMBED ===== */
.viewer-embed {
    width: 100%;
    height: 500px;
    border-radius: 16px;
    overflow: hidden;
    margin: 48px 0;
    border: 1px solid rgba(255,255,255,0.05);
}

.viewer-embed iframe {
    width: 100%;
    height: 100%;
    border: none;
}

.viewer-caption {
    font-family: var(--font-ui);
    font-size: 13px;
    color: var(--color-text-muted);
    text-align: center;
    margin-top: 12px;
}

/* ===== CHAPTER NAVIGATION ===== */
.chapter-nav {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    margin-top: 80px;
    padding-top: 40px;
    border-top: 1px solid rgba(255,255,255,0.08);
}

.chapter-nav-item {
    flex: 1;
    background: var(--color-bg-surface);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: 12px;
    padding: 24px;
    text-decoration: none;
    transition: all 0.2s;
}

.chapter-nav-item:hover {
    border-color: rgba(255,255,255,0.1);
    transform: translateY(-2px);
}

.chapter-nav-item.next {
    text-align: right;
}

.nav-direction {
    font-family: var(--font-ui);
    font-size: 11px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: 8px;
}

.nav-title {
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text-primary);
}

/* ===== FOOTER ===== */
.article-footer {
    max-width: 720px;
    margin: 0 auto;
    padding: 60px 40px;
    text-align: center;
    border-top: 1px solid rgba(255,255,255,0.05);
}

.footer-logo {
    font-family: var(--font-ui);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: 16px;
}

.footer-link {
    font-family: var(--font-ui);
    font-size: 13px;
    color: var(--color-accent-blue);
    text-decoration: none;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .nav-editorial {
        padding: 16px 20px;
    }
    
    .nav-series {
        display: none;
    }
    
    .chapter-hero {
        padding: 120px 20px 60px;
    }
    
    .article-content {
        padding: 40px 20px 60px;
    }
    
    .chapter-nav {
        flex-direction: column;
    }
    
    .chapter-nav-item.next {
        text-align: left;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}