/* toc.css — collapsible quick navigation */
.toc {
    background: var(--c-bg-dark);
    border-radius: var(--radius-card);
    padding: 0.5rem 1rem;
    margin-block: var(--sp-paragraph);
}
.toc__toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    width: 100%;
    padding: 0.6rem 0;
    color: var(--c-white);
    font-weight: var(--fw-semibold);
    font-size: 1.05rem;
    text-align: left;
}
.toc__title { color: var(--c-heading); }
.toc__arrow { transition: transform var(--transition-fast); color: var(--c-accent-soft); }
.toc__toggle[aria-expanded="false"] .toc__arrow { transform: rotate(-90deg); }

.toc__list {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    padding: 0.5rem 0 0.75rem;
    margin: 0;
    overflow: hidden;
}
.toc[hidden-list] .toc__list,
.toc__list[hidden] { display: none; }
.toc__link {
    display: block;
    padding: 0.45rem 0.5rem;
    color: var(--c-text);
    border-radius: 4px;
    border-left: 2px solid transparent;
    transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}
.toc__link:hover {
    color: var(--c-white);
    background: rgba(255, 255, 255, 0.03);
    border-left-color: var(--c-accent-soft);
}