:root {
    --color-bg: #FAFAF7;
    --color-text: #1a1a1a;
    --color-text-secondary: #4a4a4a;
    --color-accent: #2D5A3D;
    --color-accent-light: #E8F0EB;
    --color-accent-warm: #8B6914;
    --color-border: #E0DDD5;
    --color-surface: #FFFFFF;
    --font-serif: 'Source Serif 4', Georgia, serif;
    --font-sans: 'DM Sans', system-ui, sans-serif;
    --max-width: 740px;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    font-size: 17px;
    -webkit-font-smoothing: antialiased;
}

header {
    border-bottom: 1px solid var(--color-border);
    padding: 1.5rem 2rem;
    background: var(--color-surface);
}

.header-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.logo {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.logo span { color: var(--color-accent-warm); }

.header-nav {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.header-nav a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-decoration: none;
}

.header-nav a:hover { color: var(--color-accent); }

.header-tag {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    background: var(--color-accent-light);
    padding: 0.3rem 0.75rem;
    border-radius: 20px;
    font-weight: 500;
}

.hero {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 3.5rem 2rem 2rem;
}

.hero-category {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-accent);
    margin-bottom: 1rem;
}

h1 {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 5vw, 2.8rem);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text);
    margin-bottom: 1.25rem;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    max-width: 620px;
}

.hero-meta {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 2rem;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

.hero-meta a { color: var(--color-text-secondary); }

.article-body {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem 4rem;
}

.article-body p { margin-bottom: 1.4rem; }

.article-body ul {
    margin: 0 0 1.4rem 1.25rem;
}

.article-body li { margin-bottom: 0.4rem; }

h2 {
    font-family: var(--font-serif);
    font-size: 1.65rem;
    font-weight: 600;
    margin-top: 3rem;
    margin-bottom: 1rem;
    color: var(--color-text);
    letter-spacing: -0.01em;
    line-height: 1.3;
}

h3 {
    font-family: var(--font-sans);
    font-size: 1.15rem;
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    color: var(--color-accent);
}

a {
    color: var(--color-accent);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
    transition: color 0.2s;
}

a:hover { color: var(--color-accent-warm); }

.stat-block {
    background: var(--color-accent-light);
    border-left: 3px solid var(--color-accent);
    padding: 1.25rem 1.5rem;
    margin: 2rem 0;
    border-radius: 0 6px 6px 0;
}

.stat-block .stat-number {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-accent);
    display: block;
    margin-bottom: 0.25rem;
}

.stat-block .stat-label {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
}

blockquote {
    border-left: 3px solid var(--color-accent-warm);
    padding: 1rem 1.5rem;
    margin: 2rem 0;
    background: #FFF9EE;
    border-radius: 0 6px 6px 0;
    font-style: italic;
    color: var(--color-text-secondary);
}

blockquote cite {
    display: block;
    font-style: normal;
    font-weight: 600;
    font-size: 0.85rem;
    margin-top: 0.5rem;
    color: var(--color-text);
}

.toc-indicator {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 1.5rem;
    margin: 2rem 0;
}

.toc-indicator .toc-title {
    font-size: 0.8rem;
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.06em;
    color: var(--color-accent);
    margin-bottom: 0.75rem;
}

.toc-indicator ol {
    list-style: decimal;
    padding-left: 1.25rem;
    margin: 0;
}

.toc-indicator li {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    padding: 0.2rem 0;
    margin: 0;
}

.toc-indicator li a {
    color: var(--color-text-secondary);
    text-decoration: none;
}

.toc-indicator li a:hover { color: var(--color-accent); }

.faq-section {
    margin-top: 3rem;
    border-top: 2px solid var(--color-accent);
    padding-top: 2rem;
}

.faq-section h2 { margin-top: 0; }

.faq-item {
    border-bottom: 1px solid var(--color-border);
    padding: 1.25rem 0;
}

.faq-item summary {
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 1.05rem;
    color: var(--color-text);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    list-style: none;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
    content: '+';
    font-size: 1.3rem;
    color: var(--color-accent);
    flex-shrink: 0;
    transition: transform 0.3s;
}

.faq-item[open] summary::after { transform: rotate(45deg); }

.faq-item .faq-answer {
    padding-top: 0.75rem;
}

.faq-item .faq-answer p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.65;
    margin-bottom: 0;
}

.sources {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.sources h2 {
    font-size: 1.2rem;
    margin-top: 0;
}

.sources ul { margin-left: 1.25rem; }

.page-simple {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 3.5rem 2rem 4rem;
}

.page-simple p { margin-bottom: 1.2rem; }

.page-simple h2:first-of-type { margin-top: 2rem; }

footer {
    border-top: 1px solid var(--color-border);
    padding: 2.5rem 2rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    background: var(--color-surface);
}

footer nav {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 0.75rem;
}

footer a { color: var(--color-text-secondary); }

@media (max-width: 640px) {
    header { padding: 1.25rem; }
    .hero { padding: 2.5rem 1.25rem 1.5rem; }
    .article-body { padding: 0 1.25rem 3rem; }
    .page-simple { padding: 2.5rem 1.25rem 3rem; }
    .hero-meta { flex-direction: column; gap: 0.5rem; }
    h2 { font-size: 1.4rem; }
    .header-tag { display: none; }
}