/**
 * ═══════════════════════════════════════════════════════════
 * Layout — Container, Grid, Sections
 * ═══════════════════════════════════════════════════════════
 *
 * Purpose:
 *   - Page-level structural layout primitives
 *   - Container width and padding
 *   - Grid system
 *   - Section spacing
 *   - Site header / navigation shell
 *   - Site footer shell
 *
 * Load order: after base.css
 * ═══════════════════════════════════════════════════════════
 */

/* ── Container ───────────────────────────────────────────────── */

.container {
    width: 100%;
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: var(--container-padding);
}

/* Narrower container for prose/article content */
.container--narrow {
    max-width: 760px;
}

/* ── Section ─────────────────────────────────────────────────── */

.section {
    padding-block: var(--section-padding-y);
}

.section--sm {
    padding-block: calc(var(--space-16) * var(--section-scale));
}

.section--lg {
    padding-block: calc(var(--section-padding-y) * 1.5);
}

/* Alternate section background for visual rhythm */
.section--alt {
    background-color: var(--color-surface);
}

/* ── Section Header ──────────────────────────────────────────── */
/* Consistent heading block used at the top of most sections */

.section-header {
    margin-bottom: var(--space-12);
}

.section-header--center {
    text-align: center;
    max-width: 640px;
    margin-inline: auto;
    margin-bottom: var(--space-12);
}

.section-label {
    display: inline-block;
    font-size: var(--text-xs);
    font-weight: var(--weight-semibold);
    letter-spacing: var(--tracking-wider);
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: var(--space-3);
}

.section-title {
    font-size: clamp(var(--text-2xl), 3vw, var(--text-4xl));
    font-weight: var(--weight-bold);
    line-height: var(--leading-tight);
    letter-spacing: var(--tracking-tight);
    color: var(--color-text);
    margin-bottom: var(--space-4);
}

.section-subtitle {
    font-size: var(--text-lg);
    color: var(--color-text-muted);
    line-height: var(--leading-relaxed);
}

/* ── Grid System ─────────────────────────────────────────────── */

/* Auto-responsive grid — shrinks columns automatically */
.grid {
    display: grid;
    gap: var(--space-8);
}

/* Explicit column counts (override at breakpoints in responsive.css) */
.grid--2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid--3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid--4 {
    grid-template-columns: repeat(4, 1fr);
}

/* Auto-fit — fills available space, wraps at --min column width */
.grid--auto-sm {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.grid--auto-md {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid--auto-lg {
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
}

/* Gap variants */
.grid--gap-sm { gap: var(--space-4); }
.grid--gap-lg { gap: var(--space-12); }

/* ── Flex Utilities ──────────────────────────────────────────── */

.flex         { display: flex; }
.flex-col     { flex-direction: column; }
.flex-wrap    { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start  { align-items: flex-start; }
.justify-between { justify-content: space-between; }
.justify-center  { justify-content: center; }
.gap-2  { gap: var(--space-2); }
.gap-4  { gap: var(--space-4); }
.gap-6  { gap: var(--space-6); }
.gap-8  { gap: var(--space-8); }

/* ── Site Header Shell ───────────────────────────────────────── */
/* Visual styling completed in Phase 3 */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background-color: var(--color-bg);
    border-bottom: 1px solid transparent;
    z-index: var(--z-nav);
    transition:
        border-color var(--transition-base),
        box-shadow   var(--transition-base),
        background   var(--transition-base);
}

.site-header--scrolled {
    border-bottom-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

.nav {
    display: flex;
    align-items: center;
    height: 100%;
    gap: var(--space-8);
}

.nav__logo {
    flex-shrink: 0;
    text-decoration: none;
}

.nav__logo-name {
    font-weight: var(--weight-semibold);
    font-size: var(--text-lg);
    color: var(--color-text);
    letter-spacing: var(--tracking-tight);
}

.nav__menu {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-left: auto;
    list-style: none;
}

.nav__cv {
    flex-shrink: 0;
    margin-left: var(--space-4);
}

/* Mobile toggle — hidden on desktop */
.nav__toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    margin-left: auto;
    padding: 0;
    background: none;
    border: none;
    cursor: pointer;
}

.nav__toggle-bar {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-text);
    border-radius: var(--radius-full);
    transition: transform var(--transition-base), opacity var(--transition-base);
}

/* Offset page content so it isn't hidden behind the fixed nav */
main#main-content {
    padding-top: var(--header-height);
}

/* ── Site Footer Shell ───────────────────────────────────────── */
/* Visual styling completed in Phase 3 */

.site-footer {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding-block: var(--space-12);
}

.footer__inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-6);
    text-align: center;
}

.footer__name {
    font-weight: var(--weight-semibold);
    font-size: var(--text-lg);
    color: var(--color-text);
}

.footer__nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-4) var(--space-6);
}

.footer__nav a {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.footer__copy {
    font-size: var(--text-xs);
    color: var(--color-text-light);
}