@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=DM+Sans:wght@400;500;700&display=swap');

:root {
    --primary: #FF6B35;
    --primary-dark: #E55A2B;
    --secondary: #F7931E;
    --accent: #FFB84D;
    --bg-dark: #0A0A0F;
    --bg-card: #151520;
    --bg-card-hover: #1C1C2A;
    --text-primary: #FFFFFF;
    --text-secondary: #9B9BA8;
    --text-muted: #5E5E6E;
    --border: #252535;
    --success: #00D9A6;
    --shadow: rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: 'DM Sans', sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    overflow-x: hidden;
}

#music-player-app {
    min-height: 100vh;
    background: linear-gradient(135deg, #0A0A0F 0%, #1A0A1F 100%);
    position: relative;
}

#music-player-app::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 20%, rgba(255, 107, 53, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(247, 147, 30, 0.06) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.player-container {
    display: flex;
    min-height: calc(100vh - 100px);
    position: relative;
    z-index: 1;
    padding-bottom: 100px;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: rgba(21, 21, 32, 0.6);
    backdrop-filter: blur(20px);
    border-right: 1px solid var(--border);
    padding: 2rem;
    position: fixed;
    height: calc(100vh - 100px);
    overflow-y: auto;
    animation: slideInLeft 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 3rem;
    animation: fadeInScale 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.2s backwards;
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.logo h1 {
    font-family: 'Syne', sans-serif;
    font-size: 1.75rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.875rem 1.25rem;
    background: transparent;
    border: none;
    border-radius: 12px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    text-align: left;
    font-family: 'DM Sans', sans-serif;
}

.nav-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 0;
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transition: width 0.3s ease;
    z-index: -1;
}

.nav-item:hover {
    color: var(--text-primary);
    transform: translateX(4px);
}

.nav-item:hover::before {
    width: 100%;
}

.nav-item.active {
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    color: var(--text-primary);
    font-weight: 600;
    box-shadow: 0 4px 20px rgba(255, 107, 53, 0.3);
}

.nav-item svg {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 280px;
    padding: 2rem;
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.3s backwards;
}

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

.view {
    display: none;
}

.view.active {
    display: block;
}

.content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.content-header h2 {
    font-family: 'Syne', sans-serif;
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -1px;
}

.search-box {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: rgba(21, 21, 32, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border);
    border-radius: 50px;
    padding: 0.75rem 1.5rem;
    min-width: 300px;
    transition: all 0.3s ease;
}

.search-box:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.15);
}

.search-box svg {
    color: var(--text-muted);
}

.search-box input {
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 0.95rem;
    flex: 1;
    font-family: 'DM Sans', sans-serif;
}

.search-box input::placeholder {
    color: var(--text-muted);
}

/* Playlist Grid */
.playlist-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
}

.loading {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem;
    gap: 1rem;
}

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

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

.track-card {
    background: rgba(21, 21, 32, 0.6);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.25rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    animation: fadeInScale 0.5s cubic-bezier(0.16, 1, 0.3, 1) backwards;
}

.track-card:nth-child(1) { animation-delay: 0.1s; }
.track-card:nth-child(2) { animation-delay: 0.15s; }
.track-card:nth-child(3) { animation-delay: 0.2s; }
.track-card:nth-child(4) { animation-delay: 0.25s; }
.track-card:nth-child(5) { animation-delay: 0.3s; }
.track-card:nth-child(6) { animation-delay: 0.35s; }

.track-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.track-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary);
    box-shadow: 0 12px 40px rgba(255, 107, 53, 0.3);
}

.track-card:hover::before {
    opacity: 0.1;
}

.track-card.playing {
    border-color: var(--primary);
    box-shadow: 0 8px 30px rgba(255, 107, 53, 0.4);
}

.track-card.playing::before {
    opacity: 0.15;
}

.track-cover-wrapper {
    position: relative;
    width: 100%;
    padding-bottom: 100%;
    background: var(--bg-card);
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.track-cover-wrapper img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.track-cover-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.2), rgba(247, 147, 30, 0.2));
}

.track-cover-placeholder svg {
    width: 50%;
    height: 50%;
    opacity: 0.5;
}

.play-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.track-card:hover .play-overlay {
    opacity: 1;
}

.play-overlay svg {
    width: 50px;
    height: 50px;
    color: var(--text-primary);
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.3));
}

.track-info h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.track-info p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Upload Container */
.upload-container {
    max-width: 600px;
    margin: 0 auto;
}

.upload-zone {
    background: rgba(21, 21, 32, 0.6);
    backdrop-filter: blur(10px);
    border: 2px dashed var(--border);
    border-radius: 20px;
    padding: 3rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 2rem;
}

.upload-zone.drag-over {
    border-color: var(--primary);
    background: rgba(255, 107, 53, 0.1);
    transform: scale(1.02);
}

.upload-zone svg {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.upload-zone h3 {
    font-family: 'Syne', sans-serif;
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.upload-zone p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.btn-select-file {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border: none;
    padding: 0.875rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: 'DM Sans', sans-serif;
    font-size: 0.95rem;
}

.btn-select-file:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 107, 53, 0.4);
}

.upload-details {
    background: rgba(21, 21, 32, 0.6);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.form-group input {
    width: 100%;
    background: rgba(10, 10, 15, 0.6);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.875rem 1rem;
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
    font-family: 'DM Sans', sans-serif;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.15);
}

.upload-progress {
    margin: 1.5rem 0;
}

.progress-bar {
    height: 8px;
    background: var(--bg-card);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 10px;
}

.progress-text {
    display: block;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 600;
}

.btn-primary {
    width: 100%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: 'DM Sans', sans-serif;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 107, 53, 0.4);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Player Bar */
.player-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 100px;
    background: rgba(15, 15, 25, 0.95);
    backdrop-filter: blur(30px);
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    gap: 2rem;
    z-index: 1000;
    animation: slideInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) 0.5s backwards;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(100%);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.player-track-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex: 0 0 300px;
}

.track-cover {
    width: 60px;
    height: 60px;
    border-radius: 8px;
    overflow: hidden;
    background: var(--bg-card);
    flex-shrink: 0;
}

.track-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.track-details {
    flex: 1;
    min-width: 0;
}

.track-title {
    font-weight: 600;
    font-size: 0.95rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 0.25rem;
}

.track-artist {
    font-size: 0.85rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.player-controls {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.control-buttons {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.control-btn {
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.control-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: scale(1.1);
}

.play-btn {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    box-shadow: 0 4px 20px rgba(255, 107, 53, 0.3);
}

.play-btn:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    transform: scale(1.1);
    box-shadow: 0 6px 25px rgba(255, 107, 53, 0.5);
}

.progress-container {
    display: flex;
    align-items: center;
    gap: 1rem;
    width: 100%;
    max-width: 600px;
}

.time-current,
.time-total {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
    min-width: 40px;
}

.progress-track {
    flex: 1;
    position: relative;
    height: 6px;
}

.progress-bar-player {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 10px;
    width: 0%;
    pointer-events: none;
    transition: width 0.1s linear;
}

.progress-slider {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    outline: none;
    cursor: pointer;
    position: relative;
}

.progress-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    background: var(--text-primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    opacity: 0;
    transition: opacity 0.2s ease;
}

.progress-slider:hover::-webkit-slider-thumb {
    opacity: 1;
}

.progress-slider::-moz-range-thumb {
    width: 14px;
    height: 14px;
    background: var(--text-primary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    opacity: 0;
    transition: opacity 0.2s ease;
}

.progress-slider:hover::-moz-range-thumb {
    opacity: 1;
}

.player-volume {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex: 0 0 150px;
}

.volume-btn {
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.volume-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.volume-slider {
    flex: 1;
    height: 4px;
    -webkit-appearance: none;
    appearance: none;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    outline: none;
    cursor: pointer;
}

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

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

/* Responsive */
@media (max-width: 1024px) {
    .sidebar {
        width: 240px;
    }
    
    .main-content {
        margin-left: 240px;
    }
    
    .playlist-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    }
}

@media (max-width: 768px) {
    .sidebar {
        width: 70px;
        padding: 1.5rem 0.75rem;
    }
    
    .logo h1 {
        display: none;
    }
    
    .nav-item span {
        display: none;
    }
    
    .main-content {
        margin-left: 70px;
        padding: 1.5rem;
    }
    
    .content-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .search-box {
        width: 100%;
    }
    
    .playlist-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 1rem;
    }
    
    .player-bar {
        padding: 0 1rem;
        gap: 1rem;
    }
    
    .player-track-info {
        flex: 0 0 auto;
        min-width: 0;
    }
    
    .player-volume {
        display: none;
    }
}

@media (max-width: 480px) {
    .control-buttons {
        gap: 0.5rem;
    }
    
    .progress-container {
        max-width: 100%;
    }
}