/**
 * Advanced Table of Contents - Frontend Styles
 * 
 * @package Advanced_TOC
 * @version 1.0.0
 */

/* ========================================
   CSS Custom Properties (Variables)
   ======================================== */
.advanced-toc {
    --toc-primary-color: #2563eb;
    --toc-secondary-color: #1e40af;
    --toc-border-radius: 8px;
    --toc-font-size: 16px;
    --toc-box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --toc-transition: all 0.3s ease;
    --toc-bg-color: #ffffff;
    --toc-text-color: #1f2937;
    --toc-border-color: #e5e7eb;
    --toc-hover-bg: #f3f4f6;
}

/* Dark color scheme */
.advanced-toc.toc-scheme-dark {
    --toc-bg-color: #1f2937;
    --toc-text-color: #f9fafb;
    --toc-border-color: #374151;
    --toc-hover-bg: #374151;
}

/* Auto color scheme - follows system preference */
@media (prefers-color-scheme: dark) {
    .advanced-toc.toc-scheme-auto {
        --toc-bg-color: #1f2937;
        --toc-text-color: #f9fafb;
        --toc-border-color: #374151;
        --toc-hover-bg: #374151;
    }
}

/* ========================================
   Container Styles
   ======================================== */
.advanced-toc {
    background: var(--toc-bg-color);
    border: 1px solid var(--toc-border-color);
    border-radius: var(--toc-border-radius);
    box-shadow: var(--toc-box-shadow);
    margin: 2rem 0;
    padding: 1.5rem;
    font-size: var(--toc-font-size);
    color: var(--toc-text-color);
    line-height: 1.6;
    transition: var(--toc-transition);
}

/* ========================================
   Header Styles
   ======================================== */
.toc-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--toc-border-color);
}

.toc-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0;
    font-size: 1.25em;
    font-weight: 600;
    color: var(--toc-text-color);
}

.toc-icon {
    flex-shrink: 0;
    color: var(--toc-primary-color);
}

/* ========================================
   Toggle Button
   ======================================== */
.toc-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    padding: 0;
    background: transparent;
    border: 1px solid var(--toc-border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: var(--toc-transition);
    color: var(--toc-text-color);
}

.toc-toggle:hover {
    background: var(--toc-hover-bg);
    border-color: var(--toc-primary-color);
    color: var(--toc-primary-color);
}

.toc-toggle:focus {
    outline: 2px solid var(--toc-primary-color);
    outline-offset: 2px;
}

.toc-toggle-icon {
    transition: var(--toc-transition);
}

/* Collapsed state */
.advanced-toc.toc-collapsed .toc-content {
    display: none;
}

.advanced-toc.toc-collapsed .toc-toggle-collapse {
    display: none;
}

.advanced-toc.toc-collapsed .toc-toggle-expand {
    display: block !important;
}

/* ========================================
   Content Area
   ======================================== */
.toc-content {
    transition: var(--toc-transition);
}

/* ========================================
   List Styles
   ======================================== */
.toc-list {
    list-style: none;
    margin: 0;
    padding: 0;
    counter-reset: item;
}

.toc-list .toc-list {
    margin-top: 0.25rem;
    margin-left: 1.5rem;
    padding-left: 0;
    counter-reset: item;
}

/* ========================================
   List Items
   ======================================== */
.toc-item {
    margin: 0.5rem 0;
    line-height: 1.6;
    position: relative;
}

.toc-item:first-child {
    margin-top: 0;
}

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

/* Numbered lists */
ol.toc-list > .toc-item {
    counter-increment: item;
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

ol.toc-list > .toc-item::before {
    content: counter(item) ".";
    color: var(--toc-primary-color);
    font-weight: 600;
    flex-shrink: 0;
    min-width: 1.5em;
    margin-top: 0.1em;
}

/* Bulleted lists */
ul.toc-list > .toc-item {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

ul.toc-list > .toc-item::before {
    content: "•";
    color: var(--toc-primary-color);
    font-weight: 600;
    flex-shrink: 0;
    min-width: 1em;
    margin-top: 0.1em;
}

/* ========================================
   Links
   ======================================== */
.toc-link {
    display: block;
    flex: 1;
    color: var(--toc-text-color);
    text-decoration: none;
    transition: var(--toc-transition);
    border-radius: 4px;
    padding: 0.25rem 0.5rem;
    margin: -0.25rem 0 -0.25rem -0.5rem;
    line-height: 1.5;
}

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

.toc-link:focus {
    outline: 2px solid var(--toc-primary-color);
    outline-offset: 2px;
}

/* Active link (current section) */
.toc-link.toc-active {
    color: var(--toc-primary-color);
    font-weight: 600;
    background: var(--toc-hover-bg);
}

.toc-text {
    display: inline;
}

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

/* Tablet */
@media (max-width: 768px) {
    .advanced-toc {
        margin: 1.5rem 0;
        padding: 1rem;
        font-size: calc(var(--toc-font-size) * 0.9);
    }
    
    .toc-list .toc-list {
        margin-left: 1rem;
    }
    
    .toc-title {
        font-size: 1.1em;
    }
}

/* Mobile */
@media (max-width: 480px) {
    .advanced-toc {
        margin: 1rem 0;
        padding: 0.875rem;
        font-size: calc(var(--toc-font-size) * 0.85);
        border-radius: calc(var(--toc-border-radius) * 0.75);
    }
    
    .toc-header {
        margin-bottom: 0.75rem;
        padding-bottom: 0.5rem;
    }
    
    .toc-title {
        font-size: 1em;
        gap: 0.375rem;
    }
    
    .toc-icon {
        width: 16px;
        height: 16px;
    }
    
    .toc-toggle {
        width: 28px;
        height: 28px;
    }
    
    .toc-list .toc-list {
        margin-left: 0.75rem;
    }
    
    .toc-item {
        margin: 0.375rem 0;
    }
    
    /* Auto-collapse on mobile if setting enabled */
    .advanced-toc.toc-mobile-collapsed .toc-content {
        display: none;
    }
}

/* ========================================
   Animation Effects
   ======================================== */

/* Fade effect */
.advanced-toc.toc-animation-fade .toc-content {
    animation: tocFadeIn 0.3s ease-in-out;
}

@keyframes tocFadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Slide effect */
.advanced-toc.toc-animation-slide .toc-content {
    animation: tocSlideDown 0.3s ease-in-out;
}

@keyframes tocSlideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   Print Styles
   ======================================== */
@media print {
    .advanced-toc {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #000;
    }
    
    .toc-toggle {
        display: none;
    }
    
    .toc-content {
        display: block !important;
    }
    
    .toc-link {
        color: #000;
    }
}

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

/* Focus visible for keyboard navigation */
.toc-link:focus-visible,
.toc-toggle:focus-visible {
    outline: 2px solid var(--toc-primary-color);
    outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    .advanced-toc,
    .toc-link,
    .toc-toggle,
    .toc-toggle-icon {
        transition: none;
        animation: none;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    .advanced-toc {
        border-width: 2px;
    }
    
    .toc-link:hover,
    .toc-link.toc-active {
        text-decoration: underline;
    }
}

/* ========================================
   Block Editor (Gutenberg) Specific
   ======================================== */
.toc-block {
    max-width: 100%;
}

.toc-no-headings {
    color: #6b7280;
    font-style: italic;
    text-align: center;
    padding: 1rem;
    margin: 0;
}

/* ========================================
   Utility Classes
   ======================================== */
.toc-hidden {
    display: none !important;
}

.toc-sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ========================================
   Sidebar/Widget Specific Styles
   ======================================== */
.widget .advanced-toc,
aside .advanced-toc,
[class*="sidebar"] .advanced-toc {
    margin: 0 0 1.5rem 0;
}

/* Ensure list items don't break */
.toc-item {
    break-inside: avoid;
    page-break-inside: avoid;
}

/* Ensure links are clickable */
.toc-link {
    cursor: pointer;
    user-select: none;
}