:root {
    /* Dark mode colors (default) - Black with Emerald Green */
    --bg-primary: #000000;
    --bg-secondary: #0a0a0a;
    --bg-card: rgba(255, 255, 255, 0.03);
    --bg-card-hover: rgba(255, 255, 255, 0.06);
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.75);
    --text-muted: rgba(255, 255, 255, 0.5);
    --accent-primary: #10b981;
    --accent-secondary: #059669;
    --accent-hover: #34d399;
    --border-color: rgba(16, 185, 129, 0.2);
    --nav-gradient: linear-gradient(135deg, #000000 0%, #0a0a0a 100%);
    --button-bg: rgba(16, 185, 129, 0.15);
    --button-hover: rgba(16, 185, 129, 0.25);
    --input-bg: rgba(255, 255, 255, 0.05);
    --input-border: rgba(16, 185, 129, 0.3);
    --shadow: rgba(16, 185, 129, 0.1);
}

[data-theme="light"] {
    /* Light mode colors - White with Kelly/Emerald Green */
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-card: #ffffff;
    --bg-card-hover: #f3f4f6;
    --text-primary: #000000;
    --text-secondary: #374151;
    --text-muted: #6b7280;
    --accent-primary: #10b981;
    --accent-secondary: #059669;
    --accent-hover: #34d399;
    --border-color: #d1d5db;
    --nav-gradient: linear-gradient(135deg, #ffffff 0%, #f9fafb 100%);
    --button-bg: rgba(16, 185, 129, 0.1);
    --button-hover: rgba(16, 185, 129, 0.2);
    --input-bg: #ffffff;
    --input-border: #d1d5db;
    --shadow: rgba(0, 0, 0, 0.05);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, 'Helvetica Neue', sans-serif;
    background: var(--bg-primary);
    min-height: 100vh;
    color: var(--text-primary);
    padding: 0;
    transition: background-color 0.3s ease, color 0.3s ease;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.nav-bar {
    background: var(--nav-gradient);
    padding: 1rem 2rem;
    box-shadow: 0 2px 10px var(--shadow);
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: background 0.3s, color 0.3s;
    font-weight: 500;
}

.nav-links a:hover {
    background: var(--button-hover);
}

.nav-links a.active {
    background: var(--accent-primary);
    color: white;
}

.theme-toggle {
    background: transparent;
    border: 2px solid var(--accent-primary);
    color: var(--accent-primary);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.theme-toggle:hover {
    background: var(--accent-primary);
    color: var(--bg-primary);
    transform: translateY(-1px);
}

h1 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 2.5rem;
    color: var(--text-primary);
    font-weight: 700;
}

h2 {
    margin-bottom: 15px;
    color: var(--text-primary);
    font-weight: 600;
}

.api-section {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.api-row {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

.api-row label {
    font-weight: 600;
    min-width: 150px;
}

.api-row input {
    flex: 1;
    min-width: 300px;
    padding: 10px 15px;
    border: none;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
    font-size: 1rem;
}

.api-row input::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.auth-row {
    display: flex;
    gap: 15px;
    align-items: center;
    margin-top: 10px;
}

.auth-btn {
    background: linear-gradient(90deg, #4285f4, #34a853);
    color: white;
    font-weight: 600;
}

.auth-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(66, 133, 244, 0.4);
}

.auth-btn:disabled {
    background: rgba(255, 255, 255, 0.2);
    cursor: not-allowed;
    transform: none;
}

.auth-status {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
}

.auth-status.signed-in {
    color: #4ecdc4;
}

.youtube-btn {
    background: var(--accent-secondary);
    color: white;
    font-size: 1.1rem;
    font-weight: 600;
    padding: 15px 30px;
    margin-left: 10px;
}

.youtube-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px var(--shadow);
    background: var(--accent-primary);
}

.youtube-btn:disabled {
    background: var(--button-bg);
    cursor: not-allowed;
    transform: none;
    opacity: 0.5;
}

.playlist-card .youtube-upload {
    margin-top: 10px;
    padding: 8px 15px;
    background: linear-gradient(90deg, #ff0000, #ff4444);
    color: white;
    font-size: 0.9rem;
}

.playlist-card .youtube-upload:hover {
    transform: translateY(-1px);
}

.playlist-card .youtube-upload:disabled {
    background: rgba(255, 255, 255, 0.2);
    cursor: not-allowed;
    transform: none;
}

.playlist-card .youtube-link {
    margin-top: 10px;
    padding: 8px 15px;
    background: #4ecdc4;
    color: #1a1a2e;
    font-size: 0.9rem;
    text-decoration: none;
    border-radius: 6px;
    display: inline-block;
}

.playlist-card .youtube-link:hover {
    background: #45b7aa;
    text-decoration: none;
    color: #feca57;
}

.api-section, .upload-section, .playlists-section, .actions-section, .takeout-section {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 24px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px var(--shadow);
    transition: all 0.3s ease;
}

.api-section:hover, .upload-section:hover, .playlists-section:hover, .actions-section:hover, .takeout-section:hover {
    background: var(--bg-card-hover);
    box-shadow: 0 4px 12px var(--shadow);
}

.api-section {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

.api-section label {
    font-weight: 600;
}

.api-section input {
    flex: 1;
    min-width: 300px;
    padding: 12px 16px;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.api-section input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(78, 205, 196, 0.1);
}

.api-section input::placeholder {
    color: var(--text-muted);
}

button {
    padding: 12px 24px;
    border: 1px solid transparent;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s ease;
    font-family: inherit;
}

#saveApiKey, #uploadBtn {
    background: #4ecdc4;
    color: #1a1a2e;
}

#saveApiKey:hover, #uploadBtn:hover {
    background: #45b7aa;
    transform: translateY(-2px);
}

.primary-btn {
    background: var(--accent-primary);
    color: #ffffff;
    font-size: 1.1rem;
    padding: 15px 30px;
    font-weight: 600;
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px var(--shadow);
    background: var(--accent-hover);
}

.secondary-btn {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    margin-left: 10px;
}

.secondary-btn:hover {
    background: var(--button-hover);
    border-color: var(--accent-primary);
}

.upload-section input[type="file"] {
    margin: 10px 0;
}

#playlistsContainer {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 20px;
}

.playlist-card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 20px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px var(--shadow);
    transition: all 0.3s ease;
}

.playlist-card:hover {
    background: var(--bg-card-hover);
    box-shadow: 0 4px 12px var(--shadow);
    transform: translateY(-2px);
}

.playlist-card h3 {
    color: #4ecdc4;
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.playlist-card .song-count {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
}

.song-list {
    max-height: 300px;
    overflow-y: auto;
    margin-top: 10px;
}

.song-item {
    padding: 10px 14px;
    margin: 8px 0;
    background: var(--bg-secondary);
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
}

.song-item:hover {
    background: var(--bg-card-hover);
    transform: translateX(4px);
}

.song-item .song-title {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.song-item .status-icon {
    font-size: 1.2rem;
}

.song-item.found {
    border-left: 3px solid #4ecdc4;
}

.song-item.searching {
    border-left: 3px solid #feca57;
}

.song-item.error {
    border-left: 3px solid #ff6b6b;
}

.song-item a {
    color: #4ecdc4;
    text-decoration: none;
    font-size: 0.85rem;
}

.song-item a:hover {
    text-decoration: underline;
}

.status {
    text-align: center;
    padding: 15px;
    margin-top: 20px;
    border-radius: 8px;
    display: none;
}

.status.show {
    display: block;
}

.status.info {
    background: rgba(78, 205, 196, 0.2);
    color: #4ecdc4;
}

.status.error {
    background: rgba(255, 107, 107, 0.2);
    color: #ff6b6b;
}

.status.success {
    background: rgba(78, 205, 196, 0.2);
    color: #4ecdc4;
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    margin-top: 10px;
    overflow: hidden;
}

.progress-bar .progress {
    height: 100%;
    background: linear-gradient(90deg, #4ecdc4, #feca57);
    border-radius: 3px;
    transition: width 0.3s ease;
}

.playlist-actions {
    margin-top: 15px;
    display: flex;
    gap: 10px;
}

.playlist-actions button {
    flex: 1;
    padding: 8px;
    font-size: 0.9rem;
}

.export-btn {
    background: #4ecdc4;
    color: #1a1a2e;
}

.search-btn {
    background: linear-gradient(90deg, #ff6b6b, #feca57);
    color: #1a1a2e;
}

::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--button-bg);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--button-hover);
}

/* Responsive design */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-links {
        flex-direction: column;
        width: 100%;
    }
    
    .container {
        padding: 1rem;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    #playlistsContainer {
        grid-template-columns: 1fr;
    }
}

/* Footer styles */
.footer {
    text-align: center;
    padding: 2rem;
    border-top: 1px solid var(--border-color);
    margin-top: 3rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.footer a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer a:hover {
    text-decoration: underline;
    color: var(--accent-secondary);
}

.footer-legal {
    margin-top: 0.5rem;
}

.settings-link {
    margin-left: 1rem;
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.settings-link:hover {
    color: var(--accent-secondary);
    text-decoration: underline;
}

/* YouTube Takeout Section */
.takeout-section {
    border-left: 4px solid var(--accent-primary);
}

.takeout-section h2 {
    color: var(--accent-primary);
}

#takeoutInput {
    display: block;
    margin: 1rem 0;
    padding: 0.75rem;
    width: 100%;
    max-width: 500px;
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    background: var(--input-bg);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
}

#takeoutInput:hover {
    border-color: var(--accent-primary);
    background: var(--button-hover);
}

#takeoutUploadBtn {
    background: var(--accent-primary);
    color: #ffffff;
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 1.5rem;
}

#takeoutUploadBtn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
    opacity: 0.9;
}

#takeoutPlaylists {
    margin-top: 1.5rem;
}

.takeout-preview {
    background: var(--bg-secondary);
    padding: 1rem;
    border-radius: 8px;
    margin: 1rem 0;
    border-left: 3px solid var(--accent-primary);
}

.takeout-preview p {
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--accent-primary);
}

.takeout-preview ul {
    list-style: none;
    padding: 0;
}

.takeout-preview ul li {
    padding: 0.25rem 0;
    color: var(--text-secondary);
}

.takeout-preview ul li a {
    color: var(--accent-primary);
    text-decoration: none;
    font-family: monospace;
    font-size: 0.9rem;
}

.takeout-preview ul li a:hover {
    text-decoration: underline;
}