/**
 * Table of Contents Styles
 *
 * Styles for the automatic table of contents component.
 * Includes responsive design and smooth animations.
 *
 * @package Apus_Theme
 * @since 1.0.0
 */

/* ========================================
   Table of Contents Container
   ======================================== */

.apus-toc {
    background: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 8px;
    padding: 1.5rem;
    margin: 2rem 0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 5.5rem;
    z-index: 10;
}

.apus-toc-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid #dee2e6;
}

.apus-toc-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #212529;
    margin: 0;
    line-height: 1.2;
}

/* ========================================
   Toggle Button
   ======================================== */

.apus-toc-toggle {
    background: none;
    border: none;
    padding: 0.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #6c757d;
    transition: color 0.2s ease;
    width: 32px;
    height: 32px;
    border-radius: 4px;
}

.apus-toc-toggle:hover {
    color: #212529;
    background-color: rgba(0, 0, 0, 0.05);
}

.apus-toc-toggle:focus {
    outline: 2px solid #0d6efd;
    outline-offset: 2px;
}

.toggle-icon {
    width: 16px;
    height: 16px;
    position: relative;
    display: block;
}

.toggle-icon::before,
.toggle-icon::after {
    content: '';
    position: absolute;
    background-color: currentColor;
    transition: transform 0.3s ease;
}

.toggle-icon::before {
    width: 16px;
    height: 2px;
    top: 7px;
    left: 0;
}

.toggle-icon::after {
    width: 2px;
    height: 16px;
    top: 0;
    left: 7px;
}

.apus-toc-toggle[aria-expanded="false"] .toggle-icon::after {
    transform: rotate(90deg);
}

/* ========================================
   Table of Contents List
   ======================================== */

.apus-toc-list {
    list-style: none;
    counter-reset: toc-counter;
    margin: 0;
    padding: 0;
    max-height: 600px;
    overflow-y: auto;
    transition: max-height 0.3s ease, opacity 0.3s ease;
}

.apus-toc-toggle[aria-expanded="false"] + .apus-toc-list,
.apus-toc-toggle[aria-expanded="false"] ~ .apus-toc-list {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
}

.apus-toc-item {
    position: relative;
    margin-bottom: 0.5rem;
    counter-increment: toc-counter;
}

.apus-toc-item:last-child {
    margin-bottom: 0;
}

/* ========================================
   Numbering System
   ======================================== */

/* H2 Level (Primary) */
.apus-toc-item.apus-toc-level-2::before {
    content: counter(toc-counter) ". ";
    font-weight: 600;
    color: #495057;
    margin-right: 0.5rem;
}

/* H3 Level (Secondary) - Nested */
.apus-toc-sublist {
    list-style: none;
    counter-reset: toc-subcounter;
    margin: 0.5rem 0 0.5rem 1.5rem;
    padding: 0;
}

.apus-toc-sublist .apus-toc-item {
    counter-increment: toc-subcounter;
}

.apus-toc-sublist .apus-toc-item.apus-toc-level-3::before {
    content: counter(toc-counter) "." counter(toc-subcounter) " ";
    font-weight: 500;
    color: #6c757d;
    margin-right: 0.5rem;
}

/* ========================================
   Links
   ======================================== */

.apus-toc-link {
    color: #212529;
    text-decoration: none;
    display: block;
    transition: color 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
    line-height: 1.5;
    position: relative;
    padding: 0.25rem 0 0.25rem 1rem;
    border-left: 3px solid transparent;
    margin-left: -1rem;
}

.apus-toc-link:hover {
    color: #0d6efd;
    transform: translateX(4px);
}

.apus-toc-link:focus {
    outline: 2px solid #0d6efd;
    outline-offset: 2px;
    border-radius: 2px;
}

/* Active link highlighting - Issue #55 */
.apus-toc-link.active {
    color: #0d6efd;
    font-weight: 600;
    border-left-color: #0d6efd;
}

/* ========================================
   Responsive Design
   ======================================== */

/* Tablets and smaller */
@media (max-width: 768px) {
    .apus-toc {
        padding: 1rem;
        margin: 1.5rem 0;
    }

    .apus-toc-title {
        font-size: 1.1rem;
    }

    .apus-toc-list {
        max-height: 400px;
    }

    .apus-toc-sublist {
        margin-left: 1rem;
    }
}

/* Mobile */
@media (max-width: 480px) {
    .apus-toc {
        padding: 0.875rem;
        margin: 1rem 0;
    }

    .apus-toc-title {
        font-size: 1rem;
    }

    .apus-toc-link {
        font-size: 0.9rem;
    }

    .apus-toc-list {
        max-height: 300px;
        font-size: 0.9rem;
    }

    .apus-toc-sublist {
        margin-left: 0.75rem;
    }
}

/* ========================================
   Print Styles
   ======================================== */

@media print {
    .apus-toc-toggle {
        display: none;
    }

    .apus-toc-list {
        max-height: none !important;
        opacity: 1 !important;
    }

    .apus-toc-link {
        color: #000;
    }

    .apus-toc {
        box-shadow: none;
        border: 1px solid #000;
        page-break-inside: avoid;
    }
}

/* ========================================
   Accessibility
   ======================================== */

.screen-reader-text {
    border: 0;
    clip: rect(1px, 1px, 1px, 1px);
    clip-path: inset(50%);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute;
    width: 1px;
    word-wrap: normal !important;
}

.screen-reader-text:focus {
    background-color: #f1f1f1;
    border-radius: 3px;
    box-shadow: 0 0 2px 2px rgba(0, 0, 0, 0.6);
    clip: auto !important;
    clip-path: none;
    color: #21759b;
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    height: auto;
    left: 5px;
    line-height: normal;
    padding: 15px 23px 14px;
    text-decoration: none;
    top: 5px;
    width: auto;
    z-index: 100000;
}

/* ========================================
   Smooth Scroll Offset
   ======================================== */

/* Add scroll margin to headings to account for fixed headers */
h2[id],
h3[id] {
    scroll-margin-top: 2rem;
}

@media (max-width: 768px) {
    h2[id],
    h3[id] {
        scroll-margin-top: 1.5rem;
    }
}

/* ========================================
   Custom Scrollbar for TOC List
   ======================================== */

.apus-toc-list::-webkit-scrollbar {
    width: 6px;
}

.apus-toc-list::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 3px;
}

.apus-toc-list::-webkit-scrollbar-thumb {
    background: #cbd5e0;
    border-radius: 3px;
}

.apus-toc-list::-webkit-scrollbar-thumb:hover {
    background: #a0aec0;
}

/* Firefox */
.apus-toc-list {
    scrollbar-width: thin;
    scrollbar-color: #cbd5e0 #f1f1f1;
}