/* Textbook chapter styles */

.chapter-page {
    background: var(--white);
}

.chapter {
    max-width: 760px;
    margin: 0 auto;
    padding: 0 24px;
}

.chapter-header {
    padding: 120px 0 48px;
    border-bottom: 2px solid var(--yale-blue);
    margin-bottom: 48px;
}

.chapter-label {
    font-family: 'Inter', sans-serif;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 12px;
}

.chapter-header h1 {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    color: var(--yale-blue);
    margin-bottom: 16px;
    line-height: 1.2;
}

.chapter-deck {
    font-family: 'EB Garamond', serif;
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-style: italic;
}

.chapter-content {
    padding-bottom: 48px;
}

.chapter-content h2 {
    font-size: 1.5rem;
    color: var(--yale-blue);
    margin: 48px 0 16px;
}

.chapter-content h2:first-child {
    margin-top: 0;
}

.chapter-content h3 {
    font-size: 1.2rem;
    color: var(--text);
    margin: 32px 0 12px;
}

.chapter-content p {
    margin-bottom: 16px;
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.8;
}

.chapter-content ul, .chapter-content ol {
    margin: 0 0 20px 24px;
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.8;
}

.chapter-content li {
    margin-bottom: 6px;
}

.chapter-content strong {
    color: var(--text);
    font-weight: 600;
}

.equation {
    background: var(--bg-alt);
    border-left: 3px solid var(--yale-blue);
    padding: 16px 24px;
    margin: 20px 0;
    font-family: 'EB Garamond', serif;
    font-size: 1.2rem;
    color: var(--text);
    border-radius: 0 8px 8px 0;
    overflow-x: auto;
}

/* KaTeX equation blocks */
.equation .katex { font-size: 1.15em; }
.equation-label {
    font-family: 'Inter', sans-serif;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 6px;
}

/* Figures */
.figure {
    margin: 32px 0;
    text-align: center;
}
.figure svg, .figure canvas, .figure img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}
.figure-caption {
    font-size: 0.88rem;
    color: var(--text-light);
    margin-top: 10px;
    font-style: italic;
    line-height: 1.5;
}
.figure-caption strong {
    font-style: normal;
    color: var(--text-secondary);
}

/* Tables */
.chapter-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 0.95rem;
}
.chapter-content th {
    background: var(--yale-blue);
    color: white;
    padding: 10px 14px;
    text-align: left;
    font-family: 'Inter', sans-serif;
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}
.chapter-content td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
}
.chapter-content tr:hover td {
    background: var(--bg-alt);
}
.chapter-content td:first-child {
    font-weight: 500;
    color: var(--text);
}

/* Key concept callout */
.key-concept {
    background: linear-gradient(135deg, #eaf4fb 0%, #f0faf8 100%);
    border: 1px solid #c8e0f0;
    border-radius: 8px;
    padding: 20px 24px;
    margin: 24px 0;
}
.key-concept h4 {
    font-size: 0.95rem;
    color: var(--yale-blue);
    margin-bottom: 8px;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
}
.key-concept p {
    font-size: 0.98rem;
    margin-bottom: 0;
}

.note {
    background: var(--yale-blue-pale);
    padding: 16px 24px;
    margin: 20px 0;
    border-radius: 8px;
    font-size: 0.95rem;
    color: var(--yale-blue);
}

blockquote {
    border-left: 3px solid var(--accent);
    padding: 12px 24px;
    margin: 20px 0;
    background: #fef8f4;
    border-radius: 0 8px 8px 0;
    font-family: 'EB Garamond', serif;
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-style: italic;
}

.chapter-footer {
    display: flex;
    justify-content: space-between;
    padding: 32px 0;
    border-top: 1px solid var(--border);
    margin-top: 48px;
}

.chapter-nav-link {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--yale-blue);
    transition: color var(--transition);
}

.chapter-nav-link:hover {
    color: var(--accent);
}