/* Collapsible table of contents: an edge tab, vertically centered on the right.
   Uses the Nord vars from styles.css. */

.toc {
    position: fixed;
    top: 50%;
    right: 0;
    transform: translateY(-50%);
    z-index: 100;
    font-family: 'JetBrains Mono', 'Courier New', monospace;
    font-size: 0.85rem;
}

.toc-toggle {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    font: inherit;
    font-weight: 500;
    color: var(--nord8);
    background-color: rgba(136, 192, 208, 0.12);
    border: 1px solid rgba(136, 192, 208, 0.55);
    border-right: none;
    border-radius: 8px 0 0 8px;
    padding: 0.7rem 0.75rem 0.7rem 0.6rem;
    cursor: pointer;
    box-shadow: 0 0 12px rgba(136, 192, 208, 0.18), 0 6px 20px rgba(0, 0, 0, 0.35);
    transition: background-color 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.toc-toggle:hover,
.toc-toggle[aria-expanded="true"] {
    background-color: rgba(136, 192, 208, 0.22);
    border-color: var(--nord8);
    box-shadow: 0 0 16px rgba(136, 192, 208, 0.3), 0 6px 20px rgba(0, 0, 0, 0.35);
}

.toc-caret {
    display: inline-block;
    transition: transform 0.15s ease;
}

.toc-toggle[aria-expanded="true"] .toc-caret {
    transform: rotate(180deg);
}

/* Panel opens to the left of the tab, centered on it, so nothing shifts */
.toc-panel {
    position: absolute;
    right: 100%;
    top: 50%;
    transform: translateY(-50%);
    margin-right: 0.6rem;
    min-width: 200px;
    max-width: min(280px, calc(100vw - 6rem));
    max-height: 70vh;
    overflow-y: auto;
    background-color: var(--nord0);
    border: 1px solid var(--nord3);
    border-radius: 8px;
    padding: 0.6rem 0.4rem;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
}

.toc-panel[hidden] {
    display: none;
}

.toc-head {
    color: var(--nord3);
    padding: 0 0.6rem 0.4rem;
    margin-bottom: 0.3rem;
    border-bottom: 1px solid var(--nord1);
}

.toc-head .toc-prompt {
    color: var(--nord9);
}

.toc-list {
    list-style: none;
}

.toc-list a {
    display: block;
    padding: 0.2rem 0.6rem;
    color: var(--nord4);
    border-left: 2px solid transparent;
    border-radius: 2px;
}

.toc-list a::before {
    content: "./";
    color: var(--nord3);
}

.toc-list a:hover,
.toc-list a:focus-visible {
    background-color: var(--nord1);
    color: var(--nord8);
    text-decoration: none;
}

.toc-list a.is-active {
    color: var(--nord14);
    border-left-color: var(--nord14);
}