/* ──────────────────────────────────────────
   SchematicVault — Layout v2
   ────────────────────────────────────────── */

/* ── Navigation ── */
.nav {
    position: sticky;
    top: 0;
    height: 64px;
    z-index: var(--z-sticky);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--glass-border);
    padding: 0 40px;
    transition: background var(--dur) ease, border-color var(--dur) ease;
}
.nav.scrolled {
    background: rgba(5, 5, 9, 0.92);
    border-color: var(--border);
}

/* ── Page wrap ── */
.page-wrap {
    max-width: 1280px;
    margin: 0 auto;
    padding: 28px 40px;
}
.page-wrap-sm { max-width: 720px; margin: 0 auto; padding: 28px 40px; }
.page-wrap-md { max-width: 960px; margin: 0 auto; padding: 28px 40px; }

/* ── Grids ── */
.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

/* ── Footer ── */
.footer {
    border-top: 1px solid var(--border);
    background: var(--bg-alt);
    padding: 80px 40px 40px;
    margin-top: 80px;
    position: relative;
    overflow: hidden;
}
.footer::before {
    content: '';
    position: absolute;
    top: -80px;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 200px;
    background: radial-gradient(ellipse, var(--accent-glow) 0%, transparent 70%);
    opacity: 0.08;
    pointer-events: none;
}

/* ── Divider ── */
.divider {
    border: none;
    border-top: 1px solid var(--border);
    margin: 24px 0;
}

/* ── Section header ── */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    gap: 16px;
}
.section-title {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 10px;
    letter-spacing: -0.02em;
}

/* ──────── Responsive ──────── */
@media (max-width: 1100px) {
    .grid-4 { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 900px) {
    .nav { padding: 0 20px; }
    .page-wrap,
    .page-wrap-sm,
    .page-wrap-md { padding: 20px; }
    .footer { padding: 60px 20px 32px; }
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    .grid-2 { grid-template-columns: 1fr; }
}
@media (max-width: 540px) {
    .grid-4 { grid-template-columns: 1fr; }
    .grid-3 { grid-template-columns: 1fr; }
}