/* ============================================================
   PAGE TABLE OF CONTENTS
   Fixed right column showing in-page section navigation.
   Mirrors the nav-tree drawer on the left for visual balance.
   ============================================================ */

/* The sidebar - fixed position, right side, fills empty space */
.page-toc {
    position: fixed;
    top: 118px; /* below nav (66px) + session-meta (~52px) */
    right: 0;
    bottom: 0;
    width: calc((100vw - 920px) / 2);
    max-width: 280px;
    min-width: 200px;
    z-index: 50;
    background: transparent;
    pointer-events: none; /* container itself doesn't block scroll on content */
}

.page-toc-inner {
    height: 100%;
    padding: 24px 20px 24px 24px;
    overflow-y: auto;
    pointer-events: auto; /* re-enable for the actual content */
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}

.page-toc-inner::-webkit-scrollbar {
    width: 4px;
}

.page-toc-inner::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 2px;
}

.page-toc-title {
    font-family: 'Tiro Bangla', serif;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 1px dashed var(--border);
}

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

.page-toc-item {
    margin: 0;
    padding: 0;
}

.page-toc-link {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 6px 8px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.82rem;
    line-height: 1.4;
    font-family: 'Hind Siliguri', sans-serif;
    border-left: 2px solid transparent;
    border-radius: 0 4px 4px 0;
    transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.page-toc-link:hover {
    color: var(--accent);
    background: rgba(201, 123, 60, 0.05);
}

[data-theme="dark"] .page-toc-link:hover {
    background: rgba(232, 155, 92, 0.08);
}

.page-toc-num {
    flex-shrink: 0;
    font-family: 'Hind Siliguri', sans-serif;
    font-weight: 600;
    color: var(--highlight);
    font-size: 0.78rem;
    opacity: 0.7;
    min-width: 22px;
}

.page-toc-text {
    flex: 1;
    min-width: 0;
}

/* Active section (scroll-spy current) - left accent bar + warm gradient */
.page-toc-link.is-active {
    color: var(--highlight);
    font-weight: 600;
    border-left: 2.5px solid var(--highlight);
    background: linear-gradient(90deg, rgba(201, 123, 60, 0.12) 0%, transparent 80%);
}

[data-theme="dark"] .page-toc-link.is-active {
    color: var(--highlight);
    background: linear-gradient(90deg, rgba(232, 155, 92, 0.1) 0%, transparent 80%);
}

.page-toc-link.is-active .page-toc-num {
    opacity: 1;
}

/* Hide on narrow screens (mirrors nav drawer hiding behavior) */
@media (max-width: 1199px) {
    .page-toc {
        /* Convert to overlay drawer when triggered, hidden by default */
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        width: 280px;
        max-width: 80vw;
        min-width: auto;
        background: var(--bg-page);
        border-left: 1px solid var(--border);
        box-shadow: -4px 0 16px var(--shadow);
        transform: translateX(100%);
        transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 96;
        pointer-events: auto;
    }

    .page-toc.is-mobile-open {
        transform: translateX(0);
    }

    .page-toc-inner {
        padding: 70px 18px 24px 18px; /* extra top to clear nav bar */
    }
}

/* Wide screens: hide the overlay entirely */
@media (min-width: 1200px) {
    .page-toc-overlay {
        display: none !important;
    }

    /* Wide screens: session-tag stays decorative, original border */
    .session-tag.is-toc-trigger {
        cursor: default !important;
        border-style: solid !important;
        border-color: var(--border) !important;
    }
}

/* TOC trigger - replace the badge's solid border with dotted (signals clickable) */
.session-tag.is-toc-trigger {
    border-style: dotted;
    border-width: 1.5px;
    border-color: var(--highlight);
    transition: border-color 0.18s ease, transform 0.15s ease;
}

[data-theme="dark"] .session-tag.is-toc-trigger {
    border-color: var(--highlight);
}

.session-tag.is-toc-trigger:hover {
    border-color: var(--accent);
}

[data-theme="dark"] .session-tag.is-toc-trigger:hover {
    border-color: var(--highlight);
}

/* When TOC drawer is open - solid border (visual confirm "open" state) */
.session-tag.is-toc-open {
    border-style: solid !important;
    border-color: var(--highlight) !important;
}

/* On narrow screens, make the session-tag look interactive */
@media (max-width: 1199px) {
    .session-tag.is-toc-trigger {
        transition: background 0.18s ease, transform 0.15s ease, box-shadow 0.18s ease;
        user-select: none;
    }

    .session-tag.is-toc-trigger:hover,
    .session-tag.is-toc-trigger:focus-visible {
        transform: translateY(-1px);
        box-shadow: 0 2px 8px var(--shadow);
        outline: none;
    }

    .session-tag.is-toc-trigger:active {
        transform: translateY(0);
    }

    /* Open state - highlight tag while TOC drawer is open */
    .session-tag.is-toc-open {
        background: var(--highlight);
        color: var(--bg-page);
    }

    [data-theme="dark"] .session-tag.is-toc-open {
        background: var(--highlight);
        color: var(--bg-page);
    }
}

/* Mobile overlay (blur backdrop) */
.page-toc-overlay {
    position: fixed;
    inset: 0;
    z-index: 95;
    background: transparent;
    pointer-events: none;
    transition: background 0.28s ease, backdrop-filter 0.28s ease;
}

.page-toc-overlay.is-open {
    pointer-events: auto;
    background: rgba(0, 0, 0, 0.25);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}