/* Đường dẫn: tubi-ai-pp-2/ui4/css/ui4-audio.css */
/**
 * Tubi AI PP2 - UI4 Audio Library CSS
 * 
 * File: wp-content/plugins/tubi-ai-pp-2/ui4/css/audio-ui.css
 * 
 * Styling cho Audio Library widget (UI4)
 * - Responsive design
 * - Category buttons
 * - Search box
 * - Audio list
 * - Player controls
 * 
 * @package TubiAIPP2
 * @since 2.0.0
 */

/* ============================================================================
   VARIABLES
   ============================================================================ */
:root {
    --tubi-ui4-primary: #0000B3;
    --tubi-ui4-accent: #FF8C00;
    --tubi-ui4-text: #333333;
    --tubi-ui4-text-light: #666666;
    --tubi-ui4-border: #E0E0E0;
    --tubi-ui4-bg: #FFFFFF;
    --tubi-ui4-bg-hover: #F5F5F5;
    --tubi-ui4-bg-active: #E8F4FF;
    --tubi-ui4-shadow: rgba(0, 0, 0, 0.1);
    --tubi-ui4-spacing: 16px;
    --tubi-ui4-radius: 8px;
}

/* ============================================================================
   CONTAINER
   ============================================================================ */
.tubi-ui4-wrap {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    color: var(--tubi-ui4-text);
    background: var(--tubi-ui4-bg);
    border-radius: var(--tubi-ui4-radius);
    box-shadow: 0 2px 8px var(--tubi-ui4-shadow);
    overflow: hidden;
}

/* ============================================================================
   HEADER
   ============================================================================ */
.tubi-ui4-header {
    padding: var(--tubi-ui4-spacing);
    border-bottom: 2px solid var(--tubi-ui4-border);
    background: linear-gradient(to bottom, #FAFAFA, #FFFFFF);
}

/* ============================================================================
   CATEGORIES
   ============================================================================ */
.tubi-ui4-categories {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: var(--tubi-ui4-spacing);
}

.tubi-ui4-category-btn {
    padding: 10px 20px;
    border: 2px solid var(--tubi-ui4-primary);
    border-radius: 24px;
    background: var(--tubi-ui4-bg);
    color: var(--tubi-ui4-primary);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.tubi-ui4-category-btn:hover {
    background: var(--tubi-ui4-bg-hover);
    transform: translateY(-1px);
}

.tubi-ui4-category-btn:active {
    transform: translateY(0);
}

.tubi-ui4-category-btn.is-active {
    background: var(--tubi-ui4-primary);
    color: #FFFFFF;
    box-shadow: 0 2px 4px var(--tubi-ui4-shadow);
}

/* ============================================================================
   SEARCH
   ============================================================================ */
.tubi-ui4-search {
    position: relative;
}

.tubi-ui4-search-input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--tubi-ui4-border);
    border-radius: var(--tubi-ui4-radius);
    font-size: 16px;
    transition: border-color 0.2s ease;
}

.tubi-ui4-search-input:focus {
    outline: none;
    border-color: var(--tubi-ui4-primary);
    box-shadow: 0 0 0 3px rgba(0, 0, 179, 0.1);
}

.tubi-ui4-search-input::placeholder {
    color: var(--tubi-ui4-text-light);
}

/* ============================================================================
   LOADING & EMPTY STATES
   ============================================================================ */
.tubi-ui4-loading,
.tubi-ui4-empty {
    padding: 40px 20px;
    text-align: center;
    color: var(--tubi-ui4-text-light);
    font-size: 16px;
}

.tubi-ui4-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.tubi-ui4-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--tubi-ui4-border);
    border-top-color: var(--tubi-ui4-primary);
    border-radius: 50%;
    animation: tubi-spin 0.8s linear infinite;
}

@keyframes tubi-spin {
    to { transform: rotate(360deg); }
}

.tubi-ui4-empty {
    font-style: italic;
}

/* ============================================================================
   RESULTS LIST
   ============================================================================ */
.tubi-ui4-results {
    max-height: 500px;
    overflow-y: auto;
    padding: var(--tubi-ui4-spacing);
}

.tubi-ui4-results::-webkit-scrollbar {
    width: 8px;
}

.tubi-ui4-results::-webkit-scrollbar-track {
    background: var(--tubi-ui4-bg-hover);
}

.tubi-ui4-results::-webkit-scrollbar-thumb {
    background: var(--tubi-ui4-border);
    border-radius: 4px;
}

.tubi-ui4-results::-webkit-scrollbar-thumb:hover {
    background: var(--tubi-ui4-text-light);
}

/* ============================================================================
   AUDIO ITEM
   ============================================================================ */
.tubi-ui4-item {
    padding: 12px 16px;
    margin-bottom: 8px;
    border: 1px solid var(--tubi-ui4-border);
    border-radius: var(--tubi-ui4-radius);
    background: var(--tubi-ui4-bg);
    cursor: pointer;
    transition: all 0.2s ease;
}

.tubi-ui4-item:hover {
    background: var(--tubi-ui4-bg-hover);
    border-color: var(--tubi-ui4-primary);
    transform: translateX(4px);
}

.tubi-ui4-item.is-playing {
    background: var(--tubi-ui4-bg-active);
    border-color: var(--tubi-ui4-primary);
    border-left-width: 4px;
    padding-left: 13px;
}

.tubi-ui4-item-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--tubi-ui4-text);
    margin-bottom: 4px;
}

.tubi-ui4-item.is-playing .tubi-ui4-item-title {
    color: var(--tubi-ui4-primary);
}

.tubi-ui4-item-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--tubi-ui4-text-light);
}

.tubi-ui4-item-category {
    padding: 2px 8px;
    background: var(--tubi-ui4-bg-hover);
    border-radius: 12px;
    font-size: 12px;
}

.tubi-ui4-item-duration {
    font-weight: 500;
}

/* ============================================================================
   PLAYER
   ============================================================================ */
.tubi-ui4-player {
    position: sticky;
    bottom: 0;
    padding: var(--tubi-ui4-spacing);
    border-top: 2px solid var(--tubi-ui4-border);
    background: linear-gradient(to top, #FAFAFA, #FFFFFF);
    box-shadow: 0 -2px 8px var(--tubi-ui4-shadow);
}

.tubi-ui4-player-main {
    max-width: 800px;
    margin: 0 auto;
}

/* Player Meta */
.tubi-ui4-player-meta {
    margin-bottom: 12px;
    text-align: center;
}

.tubi-ui4-player-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--tubi-ui4-text);
    margin-bottom: 4px;
}

.tubi-ui4-player-sub {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 14px;
    color: var(--tubi-ui4-text-light);
}

.tubi-ui4-player-dot {
    opacity: 0.5;
}

/* Progress Bar */
.tubi-ui4-player-progress {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.tubi-ui4-player-time {
    font-size: 13px;
    font-weight: 500;
    color: var(--tubi-ui4-text-light);
    min-width: 40px;
    text-align: center;
}

.tubi-ui4-player-seek {
    flex: 1;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--tubi-ui4-border);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
}

.tubi-ui4-player-seek::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--tubi-ui4-primary);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tubi-ui4-player-seek::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.tubi-ui4-player-seek::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--tubi-ui4-primary);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tubi-ui4-player-seek::-moz-range-thumb:hover {
    transform: scale(1.2);
}

/* Player Controls */
.tubi-ui4-player-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

.tubi-ui4-player-btn {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--tubi-ui4-primary);
    border-radius: 50%;
    background: var(--tubi-ui4-bg);
    color: var(--tubi-ui4-primary);
    font-size: 20px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tubi-ui4-player-btn:hover {
    background: var(--tubi-ui4-primary);
    color: #FFFFFF;
    transform: scale(1.1);
}

.tubi-ui4-player-btn:active {
    transform: scale(1);
}

.tubi-ui4-player-play {
    width: 64px;
    height: 64px;
    font-size: 28px;
    border-width: 3px;
}

/* Volume Control */
.tubi-ui4-player-volume {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: 16px;
}

.tubi-ui4-player-mute {
    width: 40px;
    height: 40px;
    font-size: 18px;
}

.tubi-ui4-player-volume-slider {
    width: 80px;
    height: 4px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--tubi-ui4-border);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

.tubi-ui4-player-volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 12px;
    height: 12px;
    background: var(--tubi-ui4-accent);
    border-radius: 50%;
    cursor: pointer;
}

.tubi-ui4-player-volume-slider::-moz-range-thumb {
    width: 12px;
    height: 12px;
    background: var(--tubi-ui4-accent);
    border: none;
    border-radius: 50%;
    cursor: pointer;
}

/* ============================================================================
   RESPONSIVE
   ============================================================================ */

/* Tablet */
@media (max-width: 768px) {
    .tubi-ui4-wrap {
        border-radius: 0;
    }
    
    .tubi-ui4-header {
        padding: 12px;
    }
    
    .tubi-ui4-categories {
        gap: 6px;
    }
    
    .tubi-ui4-category-btn {
        padding: 8px 16px;
        font-size: 13px;
    }
    
    .tubi-ui4-results {
        max-height: 400px;
        padding: 12px;
    }
    
    .tubi-ui4-player {
        padding: 12px;
    }
    
    .tubi-ui4-player-volume {
        display: none; /* Hide volume on tablet */
    }
}

/* Mobile */
@media (max-width: 480px) {
    .tubi-ui4-header {
        padding: 8px;
    }
    
    .tubi-ui4-categories {
        gap: 4px;
        justify-content: center;
    }
    
    .tubi-ui4-category-btn {
        padding: 6px 12px;
        font-size: 12px;
    }
    
    .tubi-ui4-search-input {
        font-size: 14px;
        padding: 10px 12px;
    }
    
    .tubi-ui4-results {
        max-height: 300px;
        padding: 8px;
    }
    
    .tubi-ui4-item {
        padding: 10px 12px;
    }
    
    .tubi-ui4-item-title {
        font-size: 14px;
    }
    
    .tubi-ui4-item-meta {
        font-size: 12px;
    }
    
    .tubi-ui4-player {
        padding: 8px;
    }
    
    .tubi-ui4-player-title {
        font-size: 16px;
    }
    
    .tubi-ui4-player-sub {
        font-size: 12px;
    }
    
    .tubi-ui4-player-controls {
        gap: 12px;
    }
    
    .tubi-ui4-player-btn {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }
    
    .tubi-ui4-player-play {
        width: 56px;
        height: 56px;
        font-size: 24px;
    }
    
    .tubi-ui4-player-progress {
        gap: 8px;
    }
    
    .tubi-ui4-player-time {
        font-size: 11px;
        min-width: 35px;
    }
}

/* ============================================================================
   ACCESSIBILITY
   ============================================================================ */

/* Focus states */
.tubi-ui4-category-btn:focus,
.tubi-ui4-search-input:focus,
.tubi-ui4-player-btn:focus,
.tubi-ui4-player-seek:focus,
.tubi-ui4-player-volume-slider:focus {
    outline: 2px solid var(--tubi-ui4-primary);
    outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    .tubi-ui4-wrap {
        border: 2px solid currentColor;
    }
    
    .tubi-ui4-category-btn,
    .tubi-ui4-player-btn {
        border-width: 3px;
    }
}