/* ==========================================================================
   Drawer — left-rail navigation
   ==========================================================================
   Mobile (<1024px): hidden offscreen, slides in when ≡ is tapped. Dim
   overlay behind it; tap overlay to close.
   Desktop (≥1024px): persistent 280px rail, main content shifts right.

   The drawer replaces the in-page .site-header. When drawer.js loads it
   adds `body.has-drawer` which hides the legacy header cleanly.

   Uses existing theme tokens (--color-bg, --color-text-*, --color-gold,
   etc.) so it adapts to light/dark without any per-mode CSS.
*/

:root {
    --drawer-width: 280px;
    --drawer-width-mobile: min(85vw, 340px);
    --drawer-bg: var(--color-bg);
    --drawer-bg-topic-open: var(--color-gold-ember);
    --drawer-overlay: rgba(0, 0, 0, 0.45);
    --drawer-border: var(--color-border);
}

/* ------- Mobile-first baseline ------------------------------------- */

.drawer-toggle {
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 101;
    width: 44px;
    height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: rgba(var(--color-bg-rgb), 0.92);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    color: var(--color-text);
    cursor: pointer;
    font-size: 22px;
    line-height: 1;
    padding: 0;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: border-color var(--transition-fast), color var(--transition-fast);
}

.drawer-toggle:hover,
.drawer-toggle:focus-visible {
    border-color: var(--color-gold);
    color: var(--color-gold);
    outline: none;
}

.drawer-overlay {
    position: fixed;
    inset: 0;
    z-index: 99;
    background: var(--drawer-overlay);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

.drawer-overlay.visible {
    opacity: 1;
    pointer-events: auto;
}

.drawer {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--drawer-width-mobile);
    background: var(--drawer-bg);
    border-right: 1px solid var(--drawer-border);
    z-index: 100;
    display: flex;
    flex-direction: column;
    transform: translateX(-100%);
    transition: transform 0.28s ease;
    overflow-y: auto;
    overflow-x: hidden;
}

.drawer.open {
    transform: translateX(0);
}

/* ------- Drawer header (logo + theme toggle lands here) ------------ */

.drawer__header {
    padding: var(--space-6) var(--space-6) var(--space-4);
    border-bottom: 1px solid var(--drawer-border);
}

.drawer__header .site-nav {
    max-width: none;
    margin: 0;
    padding: 0;
    gap: var(--space-2);
}

.drawer__header .site-nav__logo {
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-weight: 300;
    letter-spacing: 0.2em;
    color: var(--color-gold);
    text-decoration: none;
    text-transform: lowercase;
}

/* ------- Nav body: sections, items --------------------------------- */

.drawer__nav {
    flex: 1;
    padding: var(--space-4) 0 var(--space-6);
    font-family: var(--font-body);
}

.drawer__section {
    margin-bottom: var(--space-5);
}

.drawer__section-title {
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.24em;
    padding: 0 var(--space-6);
    margin-bottom: var(--space-2);
}

.drawer__items {
    list-style: none;
    margin: 0;
    padding: 0;
}

.drawer__item {
    margin: 0;
}

/* Link item: direct navigation */
.drawer__link {
    display: block;
    padding: var(--space-3) var(--space-6);
    color: var(--color-text);
    text-decoration: none;
    font-size: var(--text-sm);
    line-height: 1.35;
    border-left: 2px solid transparent;
    transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.drawer__link:hover,
.drawer__link:focus-visible {
    background: var(--color-gold-ember);
    color: var(--color-text-bright);
    border-left-color: var(--color-gold-dim);
    outline: none;
}

.drawer__link-subtitle {
    display: block;
    font-size: 0.76rem;
    color: var(--color-text-muted);
    margin-top: 2px;
    font-style: italic;
}

/* Topic item: expandable preview + links */
.drawer__topic {
    border-left: 2px solid transparent;
    transition: background var(--transition-fast), border-color var(--transition-fast);
}

.drawer__topic.expanded {
    background: var(--drawer-bg-topic-open);
    border-left-color: var(--color-gold);
}

.drawer__topic-header {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    width: 100%;
    padding: var(--space-3) var(--space-6);
    background: transparent;
    border: none;
    color: var(--color-text);
    font-family: inherit;
    font-size: var(--text-sm);
    text-align: left;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.drawer__topic-header:hover,
.drawer__topic-header:focus-visible {
    color: var(--color-text-bright);
    outline: none;
}

.drawer__topic-arrow {
    flex-shrink: 0;
    width: 14px;
    color: var(--color-text-muted);
    font-size: 0.9em;
    transition: transform 0.2s ease, color var(--transition-fast);
}

.drawer__topic.expanded .drawer__topic-arrow {
    transform: rotate(90deg);
    color: var(--color-gold);
}

.drawer__topic-title {
    flex: 1;
}

.drawer__topic-body {
    display: none;
    padding: 0 var(--space-6) var(--space-4);
    padding-left: calc(var(--space-6) + 18px);
}

.drawer__topic.expanded .drawer__topic-body {
    display: block;
    animation: drawerTopicFade 0.25s ease-out both;
}

@keyframes drawerTopicFade {
    from { opacity: 0; transform: translateY(-2px); }
    to   { opacity: 1; transform: translateY(0); }
}

.drawer__topic-preview {
    font-size: 0.88rem;
    line-height: 1.55;
    color: var(--color-text-dim);
    margin: 0 0 var(--space-3);
}

.drawer__topic-links {
    list-style: none;
    margin: 0;
    padding: 0;
}

.drawer__topic-links li {
    margin-bottom: var(--space-1);
}

.drawer__topic-links a {
    display: inline-block;
    padding: 2px 0;
    color: var(--color-link);
    font-size: 0.84rem;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.drawer__topic-links a::before {
    content: '→';
    margin-right: 6px;
    color: var(--color-text-muted);
}

.drawer__topic-links a:hover {
    color: var(--color-link-hover);
}

.drawer__topic-links .empty {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    font-style: italic;
}

/* ------- Footer: my reading count (hidden when 0) ------------------ */

.drawer__footer {
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--drawer-border);
    font-size: 0.82rem;
    color: var(--color-text-muted);
    display: none; /* shown only when saved items > 0 (toggled by drawer.js) */
}

.drawer__footer.has-items {
    display: block;
}

.drawer__my-reading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    font-family: var(--font-body);
    letter-spacing: 0.04em;
}

.drawer__my-reading-label {
    text-transform: lowercase;
}

.drawer__my-reading-count {
    background: var(--color-gold);
    color: var(--color-bg);
    border-radius: 12px;
    padding: 2px 10px;
    font-size: 0.74rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}

/* ------- has-drawer body toggles the legacy .site-header ----------- */

/* Mobile: keep a tiny padding so the ≡ button doesn't cover page title */
body.has-drawer .site-header {
    display: none; /* drawer supplies all navigation */
}

/* ------- Desktop: persistent rail ---------------------------------- */

@media (min-width: 1024px) {
    .drawer {
        width: var(--drawer-width);
        transform: translateX(0); /* always visible */
        transition: none;
        border-right: 1px solid var(--drawer-border);
    }

    .drawer-toggle,
    .drawer-overlay {
        display: none;
    }

    body.has-drawer {
        padding-left: var(--drawer-width);
    }
}