:root {
    --bg-dark: #0f172a;
    --sidebar-bg: #1e293b;
    --player-bg: rgba(15, 23, 42, 0.98);
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --card-bg: #1e293b;
    --border: #334155;
    --glass-border: rgba(255, 255, 255, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
    height: -webkit-fill-available;
}

.hidden {
    display: none !important;
}

.app-container {
    display: grid;
    grid-template-columns: 260px 1fr;
    grid-template-rows: 1fr 90px;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent);
}

.nav-item {
    background: none;
    border: none;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.95rem;
    width: 100%;
    text-align: left;
    transition: 0.2s;
}

.nav-item.active {
    color: var(--text-primary);
    background-color: var(--accent);
}

/* Main Content */
.main-content {
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    padding: 24px 40px;
    background: linear-gradient(to bottom, #1e293b 0%, #0f172a 400px);
}

.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

.search-container {
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 8px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    width: 320px;
}

.search-container input {
    background: none;
    border: none;
    color: var(--text-primary);
    outline: none;
    width: 100%;
}

/* Song List */
.song-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.song-row {
    display: grid;
    grid-template-columns: 48px 1.5fr 1fr 1fr 1fr 1fr 80px;
    align-items: center;
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
}

.song-row:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.song-row.playing {
    color: var(--accent);
}

/* Group Grid Global */
.group-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
    padding: 20px 0;
}

.group-card {
    background-color: var(--sidebar-bg);
    border: 1px solid var(--border);
    padding: 24px;
    border-radius: 12px;
    cursor: pointer;
    transition: 0.3s;
    text-align: center;
}

.group-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
}

.group-name {
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.group-count {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Player Bar */
.player-bar {
    grid-column: 1 / -1;
    background-color: var(--player-bg);
    border-top: 1px solid var(--border);
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.player-controls {
    flex: 1;
    max-width: 600px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.control-buttons {
    display: flex;
    align-items: center;
    gap: 24px;
}

.control-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
}

.play-btn {
    background-color: var(--text-primary);
    color: var(--bg-dark);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.play-btn svg {
    width: 24px;
    height: 24px;
}

.progress-container {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.75rem;
}

.progress-bar-bg {
    flex: 1;
    height: 4px;
    background-color: var(--border);
    border-radius: 2px;
}

.progress-bar-fill {
    height: 100%;
    background-color: var(--text-primary);
    border-radius: 2px;
    width: 0%;
}

/* UI Utility Classes */
.desktop-only {
    display: flex !important;
}

.mobile-only {
    display: none !important;
}

@media (max-width: 1024px) {
    .desktop-only {
        display: none !important;
    }

    .mobile-only {
        display: flex !important;
    }

    .app-container {
        display: flex;
        flex-direction: column;
        height: 100dvh;
        height: -webkit-fill-available;
    }

    .sidebar {
        display: none !important;
    }

    .mobile-header {
        padding: calc(15px + env(safe-area-inset-top)) 16px 10px 16px;
        background-color: var(--sidebar-bg);
        border-bottom: 1px solid var(--border);
        flex-shrink: 0;
        min-height: calc(55px + env(safe-area-inset-top));
    }

    .main-content {
        flex: 1;
        overflow-y: auto;
        padding: 16px 20px 40px 20px;
        background: var(--bg-dark);
    }

    .player-bar {
        padding: 4px 12px;
        flex-direction: column;
        height: auto !important;
        background-color: var(--sidebar-bg);
        gap: 0;
    }

    .song-info .current-title {
        font-size: 0.75rem;
        font-weight: 700;
        line-height: 1.1;
    }

    .song-info .current-artist {
        font-size: 0.6rem;
        color: var(--text-secondary);
    }

    .control-buttons {
        gap: 16px;
        margin: 2px 0;
    }

    .play-btn {
        width: 32px;
        height: 32px;
    }

    .play-btn svg {
        width: 18px;
        height: 18px;
    }

    .progress-container {
        gap: 6px;
        margin-top: -4px;
        font-size: 0.65rem;
    }

    .progress-bar-bg {
        height: 3px;
    }

    .group-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
        position: relative;
        z-index: 5;
    }

    .group-card {
        padding: 12px 8px;
        background-color: rgba(255, 255, 255, 0.1) !important;
        border: 1px solid var(--accent);
    }

    .group-card:active {
        background-color: var(--accent) !important;
        transform: scale(0.98);
    }

    .group-name {
        font-size: 0.9rem;
        margin-bottom: 4px;
    }

    .group-count {
        font-size: 0.75rem;
    }

    .mobile-nav {
        height: calc(55px + env(safe-area-inset-bottom));
        padding-bottom: env(safe-area-inset-bottom);
        background-color: var(--sidebar-bg);
        border-top: 1px solid var(--border);
        display: flex;
        justify-content: space-around;
        align-items: center;
        padding-left: 5px;
        padding-right: 5px;
    }

    .mobile-nav .nav-item {
        flex-direction: column;
        gap: 2px;
        padding: 4px 2px;
        font-size: 0.6rem;
        width: auto !important;
        flex: 1;
        min-width: 0;
    }

    .mobile-nav .nav-item span {
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        width: 100%;
        text-align: center;
    }

    .mobile-nav .nav-item i {
        width: 18px;
        height: 18px;
    }

    .song-row {
        grid-template-columns: 30px 1fr 50px;
        padding: 10px 4px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
}