/* Base Layout */
:root {
    --bg-color: #ffffff;
    --text-color: #111111;
    --muted-color: #666666;
    --border-color: #e5e5e5;
    --card-bg: #f8f9fa;
}

body.light-body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'IBM Plex Sans', sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

.site-header {
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    z-index: 100;
}

.header-inner .brand-name {
    font-weight: 600;
    font-size: 1.1rem;
}

.header-inner .brand-desc {
    color: var(--muted-color);
    margin-left: 0.75rem;
    font-size: 0.9rem;
}

.header-nav {
    display: flex;
    gap: 1.5rem;
}

.header-nav a {
    color: var(--muted-color);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
}

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

.document-container {
    max-width: 840px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

.doc-section {
    margin-bottom: 5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 4rem;
}

.section-counter {
    font-family: monospace;
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    color: var(--muted-color);
    display: block;
    margin-bottom: 1rem;
}

h1 {
    font-family: 'IBM Plex Serif', serif;
    font-weight: 400;
    font-size: 2.25rem;
    letter-spacing: -0.02em;
    margin-top: 0;
    margin-bottom: 2rem;
}

.narrative-block {
    margin-bottom: 2rem;
}

.narrative-block h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.narrative-block p {
    color: var(--muted-color);
    font-size: 1rem;
    margin: 0;
}

.schema-strategy-block {
    background: #111;
    color: #fff;
    padding: 2.5rem;
    border-radius: 2px;
    margin: 2.5rem 0;
}

.schema-strategy-block p, .schema-strategy-block ul {
    color: #a3a3a3;
    font-size: 0.95rem;
}

.schema-strategy-block strong {
    color: #fff;
}

.schema-strategy-block ul {
    margin: 1.5rem 0;
    padding-left: 1.25rem;
}

.schema-strategy-block li {
    margin-bottom: 0.75rem;
}

.code-label {
    font-family: monospace;
    font-size: 0.75rem;
    color: #38bdf8;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Interactive Builder Grid */
.builder-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-top: 2rem;
}

.builder-inputs {
    background: #111;
    padding: 2rem;
    border-radius: 2px;
    color: #fff;
}

.builder-output {
    background: #0b0f19;
    padding: 2rem;
    border-radius: 2px;
    border: 1px solid #1e293b;
}

.site-footer {
    text-align: center;
    padding: 3rem 0;
    color: var(--muted-color);
    font-size: 0.85rem;
    border-top: 1px solid var(--border-color);
}

@media (max-width: 768px) {
    .builder-container {
        grid-template-columns: 1fr;
    }
    .header-nav {
        display: none;
    }
}