@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&display=swap');

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

:root {
    --bg-primary: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    --bg-secondary: rgba(255, 255, 255, 0.05);
    --bg-card: rgba(255, 255, 255, 0.08);
    --text-primary: #e8e8f5;
    --text-secondary: #b4b4d1;
    --accent-purple: #6c5ce7;
    --accent-pink: #fd79a8;
    --accent-blue: #74b9ff;
    --button-hover: rgba(108, 92, 231, 0.2);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --border-radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Animated background elements */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 20%, rgba(108, 92, 231, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(253, 121, 168, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 60%, rgba(116, 185, 255, 0.08) 0%, transparent 50%);
    animation: float 20s ease-in-out infinite;
    pointer-events: none;
    z-index: -1;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
}

/* Header */
header {
    text-align: center;
    padding: 2rem 1rem 1rem;
    backdrop-filter: blur(10px);
    background: var(--bg-secondary);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

header h1 {
    font-size: 2.5rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    animation: glow 2s ease-in-out infinite alternate;
}

@keyframes glow {
    from { filter: drop-shadow(0 0 10px rgba(108, 92, 231, 0.3)); }
    to { filter: drop-shadow(0 0 20px rgba(108, 92, 231, 0.6)); }
}

/* Main content */
main {
    flex: 1;
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
    padding: 2rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Player controls */
#player-controls {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

#player-controls button {
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    min-width: 120px;
    box-shadow: 0 4px 15px rgba(108, 92, 231, 0.3);
}

#player-controls button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

#player-controls button:hover::before {
    left: 100%;
}

#player-controls button:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 8px 25px rgba(108, 92, 231, 0.5);
}

#player-controls button:active {
    transform: translateY(0) scale(0.98);
}

/* Specific button styles */
#play {
    background: linear-gradient(135deg, #00b894, #55a3ff);
}

#pause {
    background: linear-gradient(135deg, #fdcb6e, #e17055);
}

#stop {
    background: linear-gradient(135deg, #fd79a8, #e84393);
}

/* Playlist section */
#playlist {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
}

#playlist h2 {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    text-align: center;
    position: relative;
}

#playlist h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-purple), var(--accent-pink));
    border-radius: 1px;
}

/* Track list */
#track-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

#track-list li {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    padding: 1.25rem 1.5rem;
    color: var(--text-secondary);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

#track-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
    transform: scaleY(0);
    transition: var(--transition);
}

#track-list li:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    transform: translateX(8px);
    border-color: rgba(108, 92, 231, 0.3);
}

#track-list li:hover::before {
    transform: scaleY(1);
}

#track-list li:active {
    transform: translateX(4px) scale(0.98);
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 1rem;
    background: var(--bg-secondary);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: auto;
}

footer p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Responsive design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    main {
        padding: 1rem;
        gap: 1.5rem;
    }
    
    #player-controls {
        padding: 1.5rem;
        gap: 1rem;
    }
    
    #player-controls button {
        padding: 0.8rem 1.5rem;
        font-size: 0.9rem;
        min-width: 100px;
    }
    
    #playlist {
        padding: 1.5rem;
    }
    
    #track-list li {
        padding: 1rem 1.25rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.8rem;
    }
    
    #player-controls {
        flex-direction: column;
        align-items: center;
    }
    
    #player-controls button {
        width: 100%;
        max-width: 200px;
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Selection styling */
::selection {
    background: rgba(108, 92, 231, 0.3);
    color: var(--text-primary);
}

/* Focus styles for accessibility */
button:focus-visible {
    outline: 2px solid var(--accent-purple);
    outline-offset: 2px;
}

#track-list li:focus-visible {
    outline: 2px solid var(--accent-purple);
    outline-offset: 2px;
}