:root {
    --primary: #3B82F6;
    --primary-dark: #2563EB;
    --primary-light: #60A5FA;
    --success: #10B981;
    --error: #EF4444;
    --warning: #F59E0B;
    --info: #3B82F6;
    --text: #FFFFFF;
    --text-dim: #B3B3B3;
    --bg: #121212;
    --bg-light: #282828;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: linear-gradient(to bottom right, #0F172A, #1E293B);
    min-height: 100vh;
    color: #F3F4F6;
    line-height: 1.5;
}

/* Sidebar */
.sidebar {
    background: rgba(17, 25, 40, 0.95);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-right: 1px solid rgba(255, 255, 255, 0.125);
}

.sidebar a {
    color: var(--text-dim);
}

.sidebar a:hover, .sidebar a.active {
    color: var(--primary);
}

/* Player */
.play-button {
    background: var(--primary);
    color: var(--bg);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.play-button:hover {
    filter: brightness(1.2);
}

/* Progress bar */
.progress-bar {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 9999px;
    overflow: hidden;
}

.progress-bar .progress {
    background: var(--primary);
    height: 100%;
    border-radius: 9999px;
    transition: width 0.2s ease;
}

/* Song list */
.song-item {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 1rem;
    padding: 0.75rem;
}

.song-item:hover {
    background: var(--bg-light);
}

.song-title {
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.song-artist, .song-duration {
    color: var(--text-dim);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        bottom: 0;
        width: 100%;
    }
}

/* Blur effects */
.blur-backdrop {
    backdrop-filter: blur(40px) saturate(180%);
    -webkit-backdrop-filter: blur(40px) saturate(180%);
}

.blur-sm {
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.blur-lg {
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
}

/* Glass morphism */
.glass {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.glass-dark {
    background: rgba(17, 24, 39, 0.7);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Responsive design */
@media (max-width: 1024px) {
    .sidebar {
        width: 240px;
    }
    
    .main-content {
        margin-left: 240px;
    }
}

@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        height: 100vh;
        position: fixed;
        left: -100%;
        transition: left 0.3s ease-in-out;
        z-index: 50;
    }
    
    .sidebar.show {
        left: 0;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .player-bar {
        padding: 0.5rem;
    }
    
    .player-controls {
        width: 100%;
        order: 1;
    }
    
    .now-playing {
        width: 100%;
        order: 0;
        margin-bottom: 1rem;
    }
    
    .volume-controls {
        display: none;
    }
}

@media (max-width: 640px) {
    .quick-access-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .library-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .search-bar {
        width: 100%;
    }
    
    .player-bar {
        padding-bottom: calc(0.5rem + env(safe-area-inset-bottom));
    }
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Animations */
@keyframes float {
    0% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
    100% {
        transform: translateY(0px);
    }
}

.animate-float {
    animation: float 3s ease-in-out infinite;
}

/* Enhanced blur effects */
.hover-blur {
    transition: backdrop-filter 0.3s ease-in-out;
}

.hover-blur:hover {
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
}

/* Mobile menu button */
.mobile-menu-btn {
    display: none;
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
        position: fixed;
        top: 1rem;
        right: 1rem;
        z-index: 60;
        background: rgba(0, 0, 0, 0.5);
        backdrop-filter: blur(8px);
        -webkit-backdrop-filter: blur(8px);
        padding: 0.5rem;
        border-radius: 0.5rem;
        border: 1px solid rgba(255, 255, 255, 0.1);
    }
}

/* Overlay for mobile menu */
.mobile-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 40;
}

@media (max-width: 768px) {
    .mobile-overlay.show {
        display: block;
    }
}

/* Safe area insets for modern mobile devices */
@supports (padding: max(0px)) {
    .safe-bottom {
        padding-bottom: max(0.5rem, env(safe-area-inset-bottom));
    }
    
    .safe-left {
        padding-left: max(1rem, env(safe-area-inset-left));
    }
    
    .safe-right {
        padding-right: max(1rem, env(safe-area-inset-right));
    }
}

.modal-content {
    background: rgba(17, 24, 39, 0.95);
    border-radius: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
}

.modal-header {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: 1rem 1.5rem;
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 1rem 1.5rem;
}

.notification {
    background: rgba(0, 0, 0, 0.8) !important;
    backdrop-filter: blur(40px) saturate(180%) !important;
    -webkit-backdrop-filter: blur(40px) saturate(180%) !important;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2) !important;
}

/* Modern Button Styles */
.btn {
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-weight: 500;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.btn-outline {
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: transparent;
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

/* Input Styles */
input[type="text"],
input[type="number"],
input[type="search"],
textarea {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 0.5rem;
    padding: 0.5rem 1rem;
    color: white;
    transition: all 0.2s ease;
}

input[type="text"]:focus,
input[type="number"]:focus,
input[type="search"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

/* Card Styles */
.card {
    background: rgba(17, 24, 39, 0.7);
    border-radius: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

/* List Item Styles */
.list-item {
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    transition: all 0.2s ease;
    cursor: pointer;
}

.list-item:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Volume Slider */
input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 9999px;
    transition: all 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 12px;
    height: 12px;
    background: white;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.3s ease;
}

.slide-up {
    animation: slideUp 0.3s ease;
}

.scale-in {
    animation: scaleIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { transform: translateY(10px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@keyframes scaleIn {
    from { transform: scale(0.95); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

/* Utility Classes */
.hover-scale {
    transition: transform 0.2s ease;
}

.hover-scale:hover {
    transform: scale(1.05);
}

.text-gradient {
    background: linear-gradient(to right, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.border-gradient {
    border: 2px solid;
    border-image: linear-gradient(to right, var(--primary), var(--primary-light)) 1;
}

/* Focus Styles */
.focus-ring {
    outline: none;
    transition: box-shadow 0.2s ease;
}

.focus-ring:focus {
    box-shadow: 0 0 0 2px var(--primary);
}

/* Interactive Elements */
.interactive {
    cursor: pointer;
    transition: all 0.2s ease;
}

.interactive:hover {
    transform: translateY(-1px);
    opacity: 0.9;
}

.interactive:active {
    transform: translateY(0);
    opacity: 0.8;
}

/* Song List Pagination */
.songs-container {
    position: relative;
    min-height: 400px;
    overflow: hidden;
}

#song-list {
    transition: transform 0.3s ease, opacity 0.3s ease;
    will-change: transform, opacity;
}

#song-list > div {
    transition: opacity 0.3s ease, transform 0.3s ease;
    will-change: transform, opacity;
}

.page-info {
    font-variant-numeric: tabular-nums;
}

/* Navigation Hints */
.songs-container::after {
    content: '← →';
    position: absolute;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.3);
    font-size: 1.5rem;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.songs-container:hover::after {
    opacity: 1;
}

/* Hide scrollbar but keep functionality */
.songs-container {
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE and Edge */
}

.songs-container::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera */
}

/* Swipe Indicator */
@media (max-width: 768px) {
    .songs-container::after {
        content: '← swipe →';
        font-size: 1rem;
    }
}