/* ── Navigation ────────────────────────────────────────────────────────────── */

nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(250, 248, 245, 0.93);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    height: 56px;
}

.nav-brand {
    font-family: var(--serif);
    font-size: 1.75rem;
    font-style: italic;
    font-weight: 500;
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: 4px;
    text-decoration: none;
    flex-shrink: 0;
}

.nav-brand-sub {
    font-size: 0.7rem;
    color: var(--muted);
    line-height: 1.15;
    margin-left: 8px;
    font-style: italic;
    font-weight: 400;
}

.nav-tabs {
    display: flex;
    height: 100%;
}

.nav-tab {
    display: flex;
    align-items: center;
    padding: 0 1.2rem;
    font-size: 0.9rem;
    color: var(--muted);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: color 0.15s, border-color 0.15s;
    user-select: none;
    text-decoration: none;
    white-space: nowrap;
}

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

.nav-tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
    font-weight: 500;
}

.nav-meta {
    font-size: 0.8rem;
    color: var(--muted);
    white-space: nowrap;
    flex-shrink: 0;
}

/* ── Hamburger button — hidden on desktop ─────────────────────────────────── */
.nav-hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 36px;
    height: 36px;
    padding: 8px;
    border-radius: 6px;
    border: none;
    background: transparent;
    cursor: pointer;
    transition: background 0.15s;
    flex-shrink: 0;
    -webkit-tap-highlight-color: transparent;
}

.nav-hamburger span {
    display: block;
    height: 1.5px;
    background: var(--muted);
    border-radius: 2px;
    transition: transform 0.2s, opacity 0.2s;
}

.nav-hamburger.open span:nth-child(1) {
    transform: translateY(6.5px) rotate(45deg);
}

.nav-hamburger.open span:nth-child(2) {
    opacity: 0;
}

.nav-hamburger.open span:nth-child(3) {
    transform: translateY(-6.5px) rotate(-45deg);
}

/* ── Overlay — invisible tap-to-close backdrop ────────────────────────────── */
.nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 98;
}

.nav-overlay.open {
    display: block;
}

/* ── Drawer ───────────────────────────────────────────────────────────────── */
/* IMPORTANT: Must use solid hex colours — NOT CSS variables — because the
   nav element has backdrop-filter which creates a new stacking context on
   Safari. Any descendant with a non-opaque background (even one set via a
   fully-opaque CSS variable) can render as transparent inside that context.
   Hard-coded hex bypasses this completely.                                    */

.nav-drawer {
    display: none;
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    z-index: 200;
    /* above nav's stacking context */
    background: #faf8f5;
    /* solid hex — not var(--bg) */
    border-bottom: 1px solid #e4ddd4;
    box-shadow: 0 6px 24px rgba(42, 36, 32, 0.1);
    flex-direction: column;
    animation: drawerIn 0.16s ease both;
}

.nav-drawer.open {
    display: flex;
}

@keyframes drawerIn {
    from {
        opacity: 0;
        transform: translateY(-4px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.nav-drawer-tab {
    display: flex;
    align-items: center;
    padding: 14px 24px;
    font-family: 'Source Sans 3', system-ui, sans-serif;
    font-size: 0.95rem;
    font-weight: 400;
    color: #6d5b4f;
    /* solid value — not var(--muted) */
    cursor: pointer;
    text-decoration: none;
    border-left: 3px solid transparent;
    background: #faf8f5;
    /* solid hex — not var(--bg) */
    transition: background 0.12s, color 0.12s;
    -webkit-tap-highlight-color: transparent;
}

.nav-drawer-tab.active {
    border: 2px solid #bfe4d3;
    border-radius: 28px;
    font-weight: 500;
    background: #edf7f1;
    margin: 6px;
    padding: 8px 18px;
}

.nav-drawer-tab.active:hover,
.nav-drawer-tab.active:active {
    background: #d8f3dc;
}

/* ── Mobile breakpoint ────────────────────────────────────────────────────── */
@media (max-width: 600px) {
    nav {
        border-radius: 0 0 28px 28px;
        padding-left: 1.5rem;
        padding-right: 1rem;
        transition: box-shadow 0.15s, border-bottom 0.15s, border-radius 0.15s;
    }

    nav.nav-drawer-open {
        border-radius: 0 !important;
        box-shadow: none !important;
        border-bottom: none !important;
    }

    .nav-drawer {
        border-radius: 0 0 28px 28px;
        /* last tab should also feel rounded — overflow hidden clips it */
        overflow: hidden;
    }

    .nav-tabs {
        display: none;
    }

    .nav-meta {
        display: none;
    }

    .nav-hamburger {
        display: flex;
    }
}