/* Base styles and reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --primary-green: #4caf50;
    --primary-green-light: #e8f5e9;
    --primary-green-dark: #388e3c;
    
    --primary-blue: #2196f3;
    --primary-blue-light: #e3f2fd;
    --primary-blue-dark: #1976d2;
    
    --text-primary: #333333;
    --text-secondary: #555555;
    --background-main: #f8f9fa;
    --background-card: #ffffff;
    --background-hover: #f1f3f4;
    --border-color: #e0e0e0;
    --shadow-color: rgba(0,0,0,0.08);
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    background-color: var(--background-main);
    color: var(--text-primary);
    padding: 1rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Typography */
h1, h2 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--primary-blue-dark);
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 700;
}

/* Common components */
.search-box {
    width: 100%;
    padding: 0.75rem;
    border-radius: 0.25rem;
    border: 1px solid var(--border-color);
    margin-bottom: 1rem;
    outline: none;
    transition: border-color 0.2s ease;
    background-color: var(--background-hover);
}

.search-box:focus {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 2px rgba(33, 150, 243, 0.2);
}

/* Audio player */
.player-container {
    background: var(--background-card);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px var(--shadow-color);
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

#audio-player {
    width: 100%;
    margin-bottom: 1rem;
    height: clamp(32px, 8vw, 40px);
    accent-color: var(--primary-blue);
}

.now-playing {
    text-align: center;
    font-size: clamp(0.8rem, 2.5vw, 0.9rem);
    color: var(--text-secondary);
    word-break: break-word;
}

/* Player controls */
.player-controls {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin: 10px 0;
}

.player-controls button {
    background: var(--background-card);
    border: 1px solid var(--primary-blue);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    color: var(--primary-blue);
    box-shadow: 0 1px 3px var(--shadow-color);
}

.player-controls button:hover {
    background-color: var(--primary-blue-light);
    transform: scale(1.05);
}

.player-controls button:active {
    transform: scale(0.95);
}

.player-controls button.active {
    background-color: var(--primary-blue);
    color: white;
}

/* Custom audio controls */
audio::-webkit-media-controls-panel {
    background-color: var(--primary-blue-light);
}

audio::-webkit-media-controls-play-button {
    background-color: var(--primary-blue);
    border-radius: 50%;
}

/* Playlist container */
.playlist-container {
    background: var(--background-card);
    padding: clamp(1rem, 3vw, 1.5rem);
    border-radius: 8px;
    box-shadow: 0 2px 8px var(--shadow-color);
    border: 1px solid var(--border-color);
}

/* Folders */
.folder {
    margin-bottom: 1.5rem;
}

.folder:last-child {
    margin-bottom: 0;
}

.folder-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    margin-bottom: 1rem;
}

.toggle-folder {
    background: var(--primary-blue-light);
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    color: var(--primary-blue-dark);
    padding: 0.2rem 0.5rem;
    border-radius: 3px;
    transition: all 0.2s ease;
}

.toggle-folder:hover {
    background-color: var(--primary-blue);
    color: white;
}

.folder-title {
    background-color: var(--primary-blue-light);
    padding: 0.8rem;
    border-radius: 4px;
    font-weight: bold;
    color: var(--primary-blue-dark);
    flex: 1;
    display: flex;
    align-items: center;
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
}

.folder-title:before {    
    content: "🎧";
    margin-right: 1px;
}

.folder-title:hover {
    background-color: var(--primary-blue);
    color: white;
}

.folder-content {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 0.8rem;
    margin-bottom: 1.5rem;
    margin-left: 1rem;
}

/* Chapters */
.chapter {
    margin-bottom: 1.5rem;
    background: var(--background-hover);
    padding: clamp(0.8rem, 2vw, 1rem);
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.chapter:last-child {
    margin-bottom: 0;
}

.chapter-header {
    display: flex;
    align-items: center;
    gap: clamp(0.5rem, 2vw, 1rem);
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.chapter-title {
    font-weight: bold;
    color: var(--primary-blue-dark);
    font-size: clamp(1rem, 2.5vw, 1.1em);
    flex: 1;
    min-width: 150px;
}

.chapter-content {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: clamp(0.3rem, 1vw, 0.5rem);
}

.chapter-progress {
    font-size: clamp(0.8rem, 2.5vw, 0.9em);
    color: var(--text-secondary);
    margin-left: auto;
}

.toggle-chapter {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text-secondary);
    padding: 0.2rem 0.5rem;
    border-radius: 3px;
    transition: all 0.2s ease;
}

.toggle-chapter:hover {
    background-color: var(--primary-blue-light);
    color: var(--primary-blue-dark);
}

/* Progress bar */
.progress-container {
    margin-top: 8px;
    height: 6px;
    width: 100%;
    background-color: #e0e0e0;
    border-radius: 3px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    width: 0;
    transition: width 0.5s ease;
}

/* Audio items */
.audio-item {
    position: relative;
    overflow: visible;
    background: white;
    color: #333;
    padding: 0.75rem;
    border-radius: 6px;
    cursor: pointer;
    border: 1px solid #ddd;
    transition: all 0.2s ease;
    font-size: 1.1rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    word-break: break-word;
    min-height: 54px;
}

.audio-item span:not(.play-icon) {
    color: #333;
    word-break: break-word;
    line-height: 1.4;
}

.audio-item:hover {
    background: #f8f9fa;
    border-color: #adb5bd;
    transform: translateY(-1px);
}

.audio-item.active {
    background: #e3f2fd;
    border-color: #2196f3;
    color: #1976d2;
    font-weight: bold;
}

.play-icon {
    display: inline-block;
    min-width: 1.2em;
    color: #666;
    transition: color 0.2s;
}

.audio-item.active .play-icon {
    color: #2196f3;
}

/* Playlist */
#playlist-container {
    background: var(--background-card);
    padding: clamp(1rem, 3vw, 1.5rem);
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow-color);
    margin-top: 20px;
    border: 1px solid var(--primary-blue);
}

#playlist-container h3 {
    margin-top: 0;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 5px;
    color: var(--primary-blue-dark);
    font-size: clamp(1rem, 2.5vw, 1.1rem);
}

.playlist-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-blue-light);
}

.playlist-header h3 {
    margin: 0;
}

.playlist-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

.playlist {
    list-style: none;
    margin-left: 1.5rem;
}

.playlist li {
    padding: 0.8rem;
    border-bottom: 1px solid #eee;
    cursor: pointer;
    transition: background-color 0.2s;
    display: flex;
    align-items: center;
}

.playlist li:last-child {
    border-bottom: none;
}

.playlist li:hover {
    background-color: var(--primary-blue-light);
}

.playlist li.active {
    background-color: var(--primary-blue);
    color: white;
}

.playlist li:before {
    content: "▶";
    margin-right: 10px;
    color: #666;
    font-size: 0.8rem;
}

.playlist-item {
    display: flex;
    align-items: center;
    padding: 8px;
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
    color: #333;
    word-break: break-word;
    line-height: 1.4;
    min-height: 55px;
}

.playlist-item:last-child {
    border-bottom: none;
}

.playlist-item:hover {
    background-color: var(--primary-blue-light);
}

.playlist-item.active {
    border-left: 4px solid #4a6cfa;
}

.playlist-item .playlist-title {
    font-size: 0.95rem;
    display: block;
    word-break: break-word;
    line-height: 1.4;
    color: #333;
}

.playlist-item.active .playlist-title {
    color: #1e3a8a;
    font-weight: 500;
}

.playlist-item.active .play-icon {
    color: var(--primary-blue-dark) !important;
}

.playlist-remove {
    cursor: pointer;
    opacity: 0.7;
    transition: opacity 0.2s;
}

.playlist-remove:hover {
    opacity: 1;
}

.playlist-empty {
    text-align: center;
    color: var(--text-secondary);
    font-style: italic;
    padding: 10px;
}

/* Playlist play controls */
#play-playlist {
    background-color: var(--primary-blue);
    color: white;
    border: none;
    border-radius: 4px;
    padding: 5px 15px;
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.2s;
}

#play-playlist:hover {
    background-color: var(--primary-blue-dark);
}

#play-playlist:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

#loop-playlist {
    background: none;
    border: 1px solid var(--primary-blue);
    border-radius: 50%;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 14px;
    color: var(--primary-blue-dark);
    transition: all 0.2s;
}

#loop-playlist:hover {
    background-color: var(--primary-blue-light);
}

#loop-playlist.active {
    background-color: var(--primary-blue);
    color: white;
}

.add-to-playlist {
    cursor: pointer;
    margin-left: 5px;
    font-weight: bold;
    font-size: 16px;
    color: var(--primary-blue-dark);
    opacity: 0.7;
    transition: opacity 0.2s;
}

.add-to-playlist:hover {
    opacity: 1;
}

/* Utility classes */
.hidden {
    display: none !important;
}

.playlist-item.invisible {
    display: block !important;
    visibility: hidden;
}

.playlist-item.opacity-0 {
    transform: translateX(10px);
}

/* Toast notifications */
.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--primary-blue-dark);
    color: white;
    padding: 10px 20px;
    border-radius: 5px;
    box-shadow: 0 2px 10px var(--shadow-color);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.3s, transform 0.3s;
    z-index: 1000;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

.toast-animation {
    animation: slideIn 0.3s ease forwards;
}

/* Keyboard shortcuts */
.keyboard-shortcut {
    display: inline-flex;
    align-items: center;
    margin: 0 0.25rem;
}

/* Button style */
button {
    transition: background-color 0.2s ease, color 0.2s ease, transform 0.1s ease, opacity 0.2s ease;
}

button:active:not(:disabled) {
    transform: scale(0.97);
}

/* Type-specific styles */
/* Lehrbuch */
.folder[data-type="lehrbuch"] .folder-title {
    background-color: var(--primary-blue-light);
    border-color: var(--primary-blue);
    color: var(--primary-blue-dark);
}

.folder[data-type="lehrbuch"] .toggle-folder {
    color: var(--primary-blue-dark);
}

.folder[data-type="lehrbuch"] .toggle-folder:hover {
    background-color: var(--primary-blue-light);
}

.folder[data-type="lehrbuch"] .chapter-title {
    color: var(--primary-blue-dark);
}

.folder[data-type="lehrbuch"] .audio-item.active {
    background: var(--primary-blue-light);
    border-color: var(--primary-blue);
    color: var(--primary-blue-dark);
}

.folder[data-type="lehrbuch"] .audio-item.active .play-icon {
    color: var(--primary-blue);
}

/* Arbeitsbuch */
.folder[data-type="arbeitsbuch"] .folder-title {
    background-color: var(--primary-green-light);
    border-color: var(--primary-green);
    color: var(--primary-green-dark);
}

.folder[data-type="arbeitsbuch"] .toggle-folder {
    color: var(--primary-green-dark);
}

.folder[data-type="arbeitsbuch"] .toggle-folder:hover {
    background-color: var(--primary-green-light);
}

.folder[data-type="arbeitsbuch"] .chapter-title {
    color: var(--primary-green-dark);
}

.folder[data-type="arbeitsbuch"] .audio-item.active {
    background: var(--primary-green-light);
    border-color: var(--primary-green);
    color: var(--primary-green-dark);
}

.folder[data-type="arbeitsbuch"] .audio-item.active .play-icon {
    color: var(--primary-green);
}

/* Animations */
@keyframes slideIn {
    from {
        transform: translateY(1rem);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.animate-spin {
    animation: spin 1s linear infinite;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
    :root {
        /* Dark mode colors */
        --primary-blue-light: #1a365d;
        --primary-blue-dark: #90caf9;
        
        --primary-green-light: #2c4a3e;
        --primary-green-dark: #9ed4b5;
        
        --text-primary: #e0e0e0;
        --text-secondary: #999;
        --background-main: #1a1a1a;
        --background-card: #2d2d2d;
        --background-hover: #252525;
        --border-color: #404040;
        --shadow-color: rgba(0,0,0,0.3);
    }

    body {
        background-color: var(--background-main);
        color: var(--text-primary);
    }

    /* Dark player controls */
    .player-controls button {
        background-color: var(--background-card);
        color: var(--primary-blue);
        border-color: var(--primary-blue);
    }
    
    .player-controls button:hover {
        background-color: var(--primary-blue-light);
    }
    
    .player-controls button.active {
        background-color: var(--primary-blue);
        color: white;
    }

    /* Dark audio controls */
    audio::-webkit-media-controls-panel {
        background-color: #34495e;
    }

    /* Dark audio items */
    .audio-item {
        background-color: #3a3a3a;
        border-color: #4a4a4a;
        color: #e0e0e0;
    }

    .audio-item span:not(.play-icon) {
        color: #e0e0e0;
    }

    .audio-item:hover {
        background-color: #4a4a4a;
        border-color: #5a5a5a;
    }

    .audio-item.active {
        background-color: #34495e;
        border-color: #2196f3;
        color: #e3f2fd;
    }

    /* Dark search box */
    .search-box {
        background-color: var(--background-card);
        border-color: var(--border-color);
        color: var(--text-primary);
    }

    .search-box:focus {
        border-color: #2980b9;
        box-shadow: 0 0 0 2px rgba(41, 128, 185, 0.2);
    }

    /* Dark folder & playlist */
    .folder-title {
        background-color: var(--primary-blue-light);
        border-color: var(--primary-blue);
        color: var(--primary-blue-dark);
    }
    
    .progress-container {
        background-color: #3a3a3a;
    }
    
    #playlist-container {
        background-color: #2c3e50;
        border-color: var(--primary-blue);
    }
    
    .playlist-item {
        border-color: #444;
    }
    
    .playlist-item:hover {
        background-color: #374a5c;
    }
    
    .playlist-empty {
        color: #aaa;
    }
    
    .add-to-playlist {
        color: var(--primary-blue);
    }
    
    .toast {
        background-color: var(--primary-blue);
        box-shadow: 0 2px 10px rgba(0,0,0,0.3);
    }
    
    /* Dark playlist controls */
    #play-playlist {
        background-color: var(--primary-blue);
    }
    
    #play-playlist:hover {
        background-color: var(--primary-blue-dark);
    }
    
    #play-playlist:disabled {
        background-color: #444;
    }
    
    #loop-playlist {
        background-color: var(--background-card);
        color: var(--primary-blue);
        border-color: var(--primary-blue);
    }
    
    #loop-playlist:hover {
        background-color: var(--primary-blue-light);
    }
    
    #loop-playlist.active {
        background-color: var(--primary-blue);
        color: white;
    }
    
    /* Dark styles for text */
    .playlist-item .playlist-title {
        color: #e5e7eb;
    }
    
    .playlist-item.active .playlist-title {
        color: #fff;
    }
    
    .now-playing,
    .keyboard-shortcuts {
        color: #b0b0b0;
    }
    
    kbd {
        background-color: #3a3a3a;
        color: #e6e6e6;
    }
}

/* Enhanced dark mode */
.dark {
    color-scheme: dark;
}

.dark body {
    background-color: #121520;
    color: #e6e6e6;
}

.dark .bg-white,
.dark .player-container,
.dark .playlist-container {
    background-color: #1e2233 !important;
    border-color: #2c304d !important;
}

.dark .player-controls button {
    background-color: #2c304d;
    color: #cccfd9;
}

.dark .player-controls button:hover {
    background-color: #3b4167;
}

.dark .player-controls button.active {
    background-color: #3b4167 !important;
    color: #ffffff !important;
}

.dark .playlist-item {
    background-color: #1e2233;
    border-color: #2c304d;
    color: #cccfd9;
}

.dark .playlist-item:hover {
    background-color: #252a40;
    border-color: #3b4167;
}

.dark .playlist-item.active {
    background-color: #3b4167 !important;
    border-color: #4e5589 !important;
}

.dark .audio-item {
    background-color: #252a40;
    border-color: #2c304d;
    color: #cccfd9;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.dark .audio-item span:not(.play-icon) {
    color: #cccfd9;
}

.dark .audio-item:hover {
    background-color: #2c304d;
    border-color: #3b4167;
}

.dark .audio-item.active {
    background-color: #3b4167;
    border-color: #4e5589;
    color: #ffffff;
}

.dark .folder-title {
    background-color: #2c304d;
    color: #cccfd9;
    border-color: #3b4167;
}

.dark .search-box {
    background-color: #1e2233;
    color: #cccfd9;
    border-color: #2c304d;
}

/* Responsive design */
@media (max-width: 1280px) {
    .folder-content {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }
}

@media (max-width: 1024px) {
    .folder-content {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    }
}

@media (max-width: 768px) {
    .folder-content {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    }
    
    .chapter-content {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    }
}

@media (max-width: 640px) {
    .container {
        padding: 0.5rem;
    }
    
    .player-controls {
        gap: 0.5rem;
    }
    
    .playlist-item {
        padding: 0.5rem;
    }
    
    .folder-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 480px) {
    body {
        padding: 0.5rem;
    }

    .player-container, 
    .playlist-container {
        padding: 1rem;
    }

    .chapter-header {
        gap: 0.5rem;
    }

    .chapter-title {
        font-size: 1rem;
    }

    .audio-item {
        font-size: 1rem;
        padding: 0.4rem 0.8rem;
    }
    
    .folder-content {
        grid-template-columns: 1fr;
    }
}

.playlist-group {
    background-color: var(--background-card);
    border-radius: 6px;
    padding: 1rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 1px 3px var(--shadow-color);
    border: 1px solid var(--border-color);
}

.chapter-marker {
    padding: 0.4rem 0.8rem;
    margin: 0.3rem 0;
    border-radius: 4px;
    background-color: var(--primary-blue-light);
    color: var(--primary-blue-dark);
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.2s ease;
    border: 1px solid var(--border-color);
}

.chapter-marker:hover {
    background-color: var(--primary-blue);
    color: white;
}

.theme-toggle {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--primary-blue);
    color: white;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 20px;
    box-shadow: 0 2px 10px var(--shadow-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    transform: scale(1.1);
    background-color: var(--primary-blue-dark);
}