/* ==========================================================================
   TOC AutoTitles Page — modern TOC
   plugins/toc_autotitles_page/css/toc_autotitles_page.css
   ========================================================================== */

:root {
    --toc-bg: #f8f9fa;
    --toc-border: #e1e4e8;
    --toc-text: #24292f;
    --toc-muted: #57606a;
    --toc-hover-bg: #f0f2f5;
    --toc-active-bg: #eef2ff;
    --toc-active-text: #4338ca;
    --toc-accent: #6366f1;
    --toc-radius: 8px;
    --toc-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    --toc-font-size: 14px;
    --toc-transition: 0.2s ease;
    --toc-scroll-offset: 80px;
    --toc-indent: 1.25rem;
}

@media (prefers-color-scheme: dark) {
    :root {
        --toc-bg: #161b22;
        --toc-border: #30363d;
        --toc-text: #e6edf3;
        --toc-muted: #8b949e;
        --toc-hover-bg: #21262d;
        --toc-active-bg: #1c2333;
        --toc-active-text: #a5b4fc;
        --toc-accent: #818cf8;
        --toc-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    }
}

.toc-wrapper {
    position: relative;
    margin: 1.5rem 0;
    padding: 1rem 1.25rem;
    background: var(--toc-bg);
    border: 1px solid var(--toc-border);
    border-radius: var(--toc-radius);
    box-shadow: var(--toc-shadow);
    font-size: var(--toc-font-size);
    line-height: 1.6;
    color: var(--toc-text);
}

.toc-wrapper.toc-position-sidebar {
    float: right;
    width: 280px;
    margin: 0 0 1.5rem 1.5rem;
}

@media (max-width: 768px) {
    .toc-wrapper.toc-position-sidebar {
        float: none;
        width: 100%;
        margin: 1.5rem 0;
    }
}

.toc-wrapper.toc-sticky {
    position: sticky;
    top: var(--toc-scroll-offset);
    max-height: calc(100vh - var(--toc-scroll-offset) - 1rem);
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--toc-muted) transparent;
}

.toc-wrapper.toc-sticky::-webkit-scrollbar { width: 6px; }
.toc-wrapper.toc-sticky::-webkit-scrollbar-thumb {
    background: var(--toc-muted);
    border-radius: 3px;
}

.toc-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--toc-border);
}

.toc-title {
    font-weight: 600;
    font-size: 1em;
    letter-spacing: -0.01em;
}

.toc-collapse-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    padding: 0;
    border: none;
    border-radius: 6px;
    background: transparent;
    color: var(--toc-muted);
    cursor: pointer;
    flex-shrink: 0;
    transition: background var(--toc-transition), color var(--toc-transition);
}

.toc-collapse-btn:hover {
    background: var(--toc-hover-bg);
    color: var(--toc-text);
}

.toc-collapse-btn svg { transition: transform var(--toc-transition); }
.toc-wrapper.toc-collapsed .toc-collapse-btn svg { transform: rotate(-90deg); }
.toc-wrapper.toc-collapsed .toc-body { display: none; }

.toc-body { overflow: hidden; }

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

.toc-item {
    position: relative;
    margin: 2px 0;
}

.toc-level-1 { padding-left: var(--toc-indent); }
.toc-level-2 { padding-left: calc(var(--toc-indent) * 2); }
.toc-level-3 { padding-left: calc(var(--toc-indent) * 3); }
.toc-level-4 { padding-left: calc(var(--toc-indent) * 4); }

.toc-link {
    display: flex;
    align-items: baseline;
    gap: 0.4em;
    padding: 4px 8px;
    border-radius: 6px;
    color: var(--toc-text);
    text-decoration: none;
    transition: background var(--toc-transition), color var(--toc-transition);
    word-break: break-word;
}

.toc-link:hover {
    background: var(--toc-hover-bg);
}

.toc-link.toc-active {
    background: var(--toc-active-bg);
    color: var(--toc-active-text);
    font-weight: 500;
}

.toc-link.toc-active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 60%;
    background: var(--toc-accent);
    border-radius: 2px;
}

.toc-number {
    color: var(--toc-muted);
    font-variant-numeric: tabular-nums;
    flex-shrink: 0;
    font-size: 0.9em;
}

.toc-link.toc-active .toc-number { color: var(--toc-active-text); }

.toc-toggle {
    position: absolute;
    right: 0;
    top: 4px;
    width: 20px;
    height: 20px;
    padding: 0;
    border: none;
    background: transparent;
    cursor: pointer;
    color: var(--toc-muted);
    display: flex;
    align-items: center;
    justify-content: center;
}

.toc-toggle::before {
    content: '';
    display: block;
    width: 6px;
    height: 6px;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    transform: rotate(45deg);
    transition: transform var(--toc-transition);
}

.toc-toggle[aria-expanded="false"]::before { transform: rotate(-45deg); }

.toc-item.toc-item-hidden { display: none; }

.toc-progress {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--toc-border);
    border-radius: var(--toc-radius) var(--toc-radius) 0 0;
    overflow: hidden;
}

.toc-progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--toc-accent), #a855f7);
    transition: width 0.15s linear;
    border-radius: 0 2px 2px 0;
}

.toc-scroll-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 44px;
    height: 44px;
    border: 1px solid var(--toc-border);
    border-radius: 50%;
    background: var(--toc-bg);
    color: var(--toc-text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--toc-shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
    z-index: 100;
}

.toc-scroll-top.toc-visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.toc-scroll-top:hover { background: var(--toc-hover-bg); }

.toc-anchor {
    display: block;
    position: relative;
    top: calc(-1 * var(--toc-scroll-offset));
    visibility: hidden;
    pointer-events: none;
}

h2:target, h3:target, h4:target, h5:target, h6:target {
    scroll-margin-top: var(--toc-scroll-offset);
}

.toc-link:focus-visible,
.toc-collapse-btn:focus-visible,
.toc-toggle:focus-visible,
.toc-scroll-top:focus-visible {
    outline: 2px solid var(--toc-accent);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    .toc-progress-bar,
    .toc-scroll-top,
    .toc-collapse-btn svg,
    .toc-toggle::before {
        transition: none;
    }
}