/* === Layout === */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--s-3);
}

.section {
    padding: var(--s-8) 0;
}

.section + .section {
    border-top: 1px solid var(--c-border);
}

/* === Header === */
.site-header {
    padding: var(--s-3) 0;
    border-bottom: 1px solid var(--c-border);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-logo {
    font-family: var(--f-heading);
    font-size: 1.5rem;
    color: var(--c-text);
    letter-spacing: 0.02em;
}

.nav-link {
    color: var(--c-text-secondary);
    margin-left: var(--s-3);
    font-size: 0.9rem;
}

/* === Shared Components === */
.topic-level {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--c-accent);
    background: rgba(197, 61, 67, 0.08);
    padding: 2px 8px;
    border-radius: 4px;
    margin-bottom: var(--s-1);
}

/* === Footer === */
.site-footer {
    padding: var(--s-6) 0;
    border-top: 1px solid var(--c-border);
    color: var(--c-text-secondary);
    font-size: 0.875rem;
    text-align: center;
}

/* === Responsive === */
@media (max-width: 640px) {
    html { font-size: 16px; }
    .section { padding: var(--s-6) 0; }
}