/* PQ Crypta MP3 Player - Advanced Styles */
/* Zero inline styles, cutting-edge ES6 design */

:root {
    /* Color Palette - Quantum Theme */
    --color-bg-primary: #0a0a0f;
    --color-bg-secondary: #1a1a2e;
    --color-bg-tertiary: #16213e;
    --color-accent-primary: #00d4ff;
    --color-accent-secondary: #7b68ee;
    --color-accent-danger: #ff1744;
    --color-text-primary: #ffffff;
    --color-text-secondary: #b0b0b0;
    --color-text-muted: #707080;

    /* Quantum Gradients */
    --gradient-quantum: linear-gradient(135deg, #00d4ff 0%, #7b68ee 50%, #ff1744 100%);
    --gradient-quantum-alt: linear-gradient(45deg, #00d4ff, #7b68ee, #ff1744, #00d4ff);
    --gradient-dark: linear-gradient(135deg, #0a0a0f 0%, #1a1a2e 100%);

    /* Shadows and Effects */
    --shadow-quantum: 0 0 30px rgba(0, 212, 255, 0.3);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-button: 0 4px 15px rgba(0, 212, 255, 0.2);
    --shadow-text: 0 2px 4px rgba(0, 0, 0, 0.5);

    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

    /* Typography */
    --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-family-mono: 'Fira Code', 'JetBrains Mono', monospace;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Z-Index Layers */
    --z-modal: 1000;
    --z-overlay: 999;
    --z-header: 100;
    --z-controls: 50;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-primary);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;

    /* Quantum background animation */
    background-image:
        radial-gradient(circle at 20% 80%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(123, 104, 238, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(255, 23, 68, 0.05) 0%, transparent 50%);
    background-attachment: fixed;
}

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

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

::-webkit-scrollbar-thumb {
    background: var(--gradient-quantum);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-accent-primary);
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: var(--color-bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.quantum-loader {
    text-align: center;
    max-width: 400px;
    padding: var(--spacing-xl);
}

.quantum-particles {
    width: 120px;
    height: 120px;
    margin: 0 auto var(--spacing-lg);
    position: relative;
    border-radius: 50%;
    border: 2px solid rgba(0, 212, 255, 0.2);
    animation: quantumSpin 2s linear infinite;
}

.quantum-particles::before,
.quantum-particles::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    border: 2px solid transparent;
}

.quantum-particles::before {
    top: 10px;
    left: 10px;
    right: 10px;
    bottom: 10px;
    border-top-color: var(--color-accent-secondary);
    animation: quantumSpin 1.5s linear infinite reverse;
}

.quantum-particles::after {
    top: 20px;
    left: 20px;
    right: 20px;
    bottom: 20px;
    border-right-color: var(--color-accent-danger);
    animation: quantumSpin 1s linear infinite;
}

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

.loading-text {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    text-shadow: var(--shadow-text);
}

.loading-progress {
    width: 100%;
    height: 4px;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-full);
    overflow: hidden;
    position: relative;
}

.progress-bar {
    height: 100%;
    background: var(--gradient-quantum);
    border-radius: var(--radius-full);
    animation: loadingProgress 2s ease-in-out infinite;
}

@keyframes loadingProgress {
    0% { width: 0%; }
    50% { width: 70%; }
    100% { width: 100%; }
}

/* Main Application */
.app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: opacity var(--transition-slow);
}

.app.hidden {
    opacity: 0;
}

/* Header */
.app-header {
    background: rgba(26, 26, 46, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 212, 255, 0.1);
    padding: var(--spacing-lg) var(--spacing-xl);
    position: sticky;
    top: 0;
    z-index: var(--z-header);
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    box-shadow: var(--shadow-card);
    overflow: visible;
    min-height: 130px;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    overflow: visible;
}

.logo-container {
    width: 110px;
    height: 110px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: visible;
    padding: 15px;
}

.logo-image {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-full);
    box-shadow: 0 0 25px rgba(0, 212, 255, 0.6);
    animation: logoFloat 2s ease-in-out infinite !important;
    animation-play-state: running !important;
    object-fit: cover;
    will-change: transform;
    transform-origin: center center;
}

.logo-icon {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 0 10px rgba(0, 212, 255, 0.5));
    animation: logoGlow 3s ease-in-out infinite;
}

@keyframes logoFloat {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

@keyframes logoGlow {
    0%, 100% { filter: drop-shadow(0 0 10px rgba(0, 212, 255, 0.5)); }
    50% { filter: drop-shadow(0 0 20px rgba(0, 212, 255, 0.8)); }
}

.brand-text h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-quantum);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
    line-height: 1.2;
}

.brand-subtitle {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

.header-nav {
    display: flex;
    gap: var(--spacing-sm);
    justify-self: center;
}

.nav-btn {
    background: transparent;
    border: 1px solid rgba(0, 212, 255, 0.2);
    color: var(--color-text-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 500;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.nav-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-quantum);
    opacity: 0.1;
    transition: left var(--transition-fast);
}

.nav-btn:hover::before,
.nav-btn.active::before {
    left: 0;
}

.nav-btn:hover {
    border-color: var(--color-accent-primary);
    color: var(--color-text-primary);
    box-shadow: var(--shadow-button);
    transform: translateY(-2px);
}

.nav-btn.active {
    border-color: var(--color-accent-primary);
    color: var(--color-accent-primary);
    box-shadow: var(--shadow-quantum);
}

.nav-icon {
    font-size: 1.1rem;
}

/* Main Content */
.app-main {
    flex: 1;
    padding: var(--spacing-xl);
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* View Management */
.view {
    display: none;
    animation: fadeInUp var(--transition-normal) ease-out;
}

.view.active {
    display: block;
}

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

/* Player View */
.player-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xxl);
    max-width: 1200px;
    margin: 0 auto;
}

.track-info-section {
    display: grid;
    grid-template-columns: 340px 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.album-art-container {
    position: relative;
    width: 320px;
    height: 320px;
}

.album-art {
    width: 100%;
    height: 100%;
    border-radius: var(--radius-xl);
    background: var(--color-bg-secondary);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-card);
    border: 2px solid rgba(0, 212, 255, 0.1);
}

.album-canvas {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-xl);
}

.album-artwork {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-xl);
    z-index: 2;
}

.album-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-dark);
}

.quantum-wave {
    width: 120px;
    height: 120px;
    border: 3px solid var(--color-accent-primary);
    border-radius: 50%;
    position: relative;
    animation: waveAnimation 2s ease-in-out infinite;
}

.quantum-wave::before,
.quantum-wave::after {
    content: '';
    position: absolute;
    border: 3px solid var(--color-accent-secondary);
    border-radius: 50%;
    animation: waveAnimation 2s ease-in-out infinite;
}

.quantum-wave::before {
    top: 10px;
    left: 10px;
    right: 10px;
    bottom: 10px;
    animation-delay: 0.3s;
}

.quantum-wave::after {
    top: 20px;
    left: 20px;
    right: 20px;
    bottom: 20px;
    border-color: var(--color-accent-danger);
    animation-delay: 0.6s;
}

@keyframes waveAnimation {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.7;
    }
}

.track-progress-ring {
    position: absolute;
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -10px;
    pointer-events: none;
    z-index: 10;
}

.progress-ring {
    transform: rotate(-90deg);
    filter: drop-shadow(0 0 10px rgba(0, 212, 255, 0.3));
}

.track-details {
    max-width: 400px;
    text-align: left;
}

.track-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
    line-height: 1.2;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.7), 0 0 15px rgba(0, 212, 255, 0.3);
    /* Remove gradient effect that causes blur */
}

.track-artist {
    font-size: 1.3rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.track-album {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
}

.track-meta {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: flex-start;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

/* Quick Selection Section */
.quick-selection-section {
    background: rgba(26, 26, 46, 0.8);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    border: 1px solid rgba(0, 212, 255, 0.1);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-card);
    margin-bottom: var(--spacing-xl);
}

.selection-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

.selection-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.selection-group label {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.selection-dropdown {
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--color-text);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    outline: none;
}

.selection-dropdown:hover {
    border-color: rgba(0, 212, 255, 0.6);
    background: rgba(0, 0, 0, 0.6);
}

.selection-dropdown:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.selection-dropdown option {
    background: #1a1a2e;
    color: var(--color-text);
    padding: var(--spacing-sm);
}

@media (max-width: 768px) {
    .selection-controls {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
}

/* Equalizer Section */
.equalizer-section {
    background: rgba(26, 26, 46, 0.8);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    border: 1px solid rgba(0, 212, 255, 0.1);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-card);
}

.section-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    text-align: center;
    color: var(--color-text-primary);
}

.equalizer-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.eq-preset-container {
    display: flex;
    justify-content: center;
}

.eq-preset-select {
    background: var(--color-bg-secondary);
    border: 1px solid rgba(0, 212, 255, 0.2);
    color: var(--color-text-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    min-width: 150px;
}

.eq-preset-select:hover,
.eq-preset-select:focus {
    border-color: var(--color-accent-primary);
    outline: none;
    box-shadow: 0 0 0 2px rgba(0, 212, 255, 0.2);
}

.eq-bands {
    display: grid;
    grid-template-columns: repeat(31, 1fr);
    gap: 4px;
    margin: var(--spacing-md) 0;
    max-width: 100%;
    justify-content: center;
    overflow-x: auto;
}

.eq-band {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    position: relative;
    min-width: 25px;
}

.eq-band-label {
    font-size: 0.55rem;
    color: var(--color-text-muted);
    font-weight: 500;
    text-align: center;
    white-space: nowrap;
    writing-mode: horizontal-tb;
    transform: rotate(-45deg);
    transform-origin: center;
    min-width: 25px;
}

.eq-band-slider {
    writing-mode: vertical-lr;
    direction: rtl;
    width: 6px;
    height: 60px;
    background: var(--color-bg-primary);
    border-radius: var(--radius-full);
    outline: none;
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
    border: 1px solid rgba(0, 212, 255, 0.2);
    transition: all var(--transition-fast);
}

.eq-band-slider::-webkit-slider-track {
    width: 6px;
    height: 100%;
    background: linear-gradient(to top, #ff1744, #00d4ff);
    border-radius: var(--radius-full);
    border: none;
}

.eq-band-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 12px;
    height: 12px;
    background: #00d4ff;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid var(--color-bg-primary);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.eq-band-slider::-moz-range-track {
    width: 6px;
    height: 100%;
    background: linear-gradient(to top, #ff1744, #00d4ff);
    border-radius: var(--radius-full);
    border: none;
}

.eq-band-slider::-moz-range-thumb {
    width: 10px;
    height: 10px;
    background: #00d4ff;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid var(--color-bg-primary);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

/* Spectrum analyzer display */
.eq-band-analyzer {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 60px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 2px;
    overflow: hidden;
    pointer-events: none;
    z-index: 1;
}

.eq-band-level {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    background: var(--color-accent-primary);
    transition: height 0.1s ease;
    border-radius: 2px;
}

.eq-band-peak {
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--color-accent-danger);
    transition: bottom 0.1s ease;
    opacity: 0;
}

/* Hover effects */
.eq-band:hover .eq-band-slider {
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 10px rgba(0, 212, 255, 0.3);
}

.eq-band:hover .eq-band-label {
    color: var(--color-accent-primary);
}

.eq-band-value {
    font-size: 0.6rem;
    color: var(--color-text-secondary);
    font-weight: 500;
    min-width: 35px;
    text-align: center;
    font-family: var(--font-family-mono);
}

.eq-advanced {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(0, 212, 255, 0.1);
}

.eq-control-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.eq-control-group label {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

.eq-control-group input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    background: var(--color-bg-primary);
    border-radius: var(--radius-full);
    outline: none;
    cursor: pointer;
}

.eq-control-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--gradient-quantum);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.eq-control-group input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--gradient-quantum);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.control-value {
    font-size: 0.8rem;
    color: var(--color-accent-primary);
    font-weight: 600;
    text-align: center;
}

/* Player Controls */
.player-controls {
    background: rgba(26, 26, 46, 0.8);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    border: 1px solid rgba(0, 212, 255, 0.1);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-card);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.control-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
}

.primary-controls {
    gap: var(--spacing-lg);
}

.control-btn {
    background: transparent;
    border: 1px solid rgba(0, 212, 255, 0.2);
    color: var(--color-text-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.control-btn svg {
    width: 24px;
    height: 24px;
    fill: currentColor;
    transition: transform var(--transition-fast);
}

.control-btn.primary {
    width: 64px;
    height: 64px;
    border-width: 2px;
}

.control-btn.primary svg {
    width: 32px;
    height: 32px;
}

.control-btn:hover {
    border-color: var(--color-accent-primary);
    color: var(--color-accent-primary);
    box-shadow: var(--shadow-button);
    transform: translateY(-2px);
}

.control-btn:active {
    transform: translateY(0);
}

.control-btn.active {
    border-color: var(--color-accent-primary);
    color: var(--color-accent-primary);
    background: rgba(0, 212, 255, 0.1);
}

.progress-controls {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
}

.time-display {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    font-weight: 500;
    font-family: var(--font-family-mono);
    min-width: 45px;
    text-align: center;
}

.progress-container {
    flex: 1;
    position: relative;
    margin: 0 var(--spacing-md);
}

.progress-bar {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: var(--color-bg-primary);
    border-radius: var(--radius-full);
    outline: none;
    cursor: pointer;
    position: relative;
}

.progress-bar::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--color-accent-primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
    transition: transform var(--transition-fast);
}

.progress-bar::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.progress-buffer {
    position: absolute;
    top: 0;
    left: 0;
    height: 6px;
    background: rgba(0, 212, 255, 0.2);
    border-radius: var(--radius-full);
    pointer-events: none;
}

.secondary-controls {
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.volume-container,
.quality-controls,
.share-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.volume-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100px;
    height: 4px;
    background: var(--color-bg-primary);
    border-radius: var(--radius-full);
    outline: none;
    cursor: pointer;
}

.volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    background: var(--color-accent-primary);
    border-radius: 50%;
    cursor: pointer;
}

.volume-display {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    min-width: 35px;
    text-align: center;
}

.quality-select {
    background: var(--color-bg-secondary);
    border: 1px solid rgba(0, 212, 255, 0.2);
    color: var(--color-text-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    cursor: pointer;
}

/* Library View */
.library-container {
    max-width: 1000px;
    margin: 0 auto;
}

.library-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.library-header h2 {
    font-size: 2rem;
    font-weight: 700;
    background: var(--gradient-quantum);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.library-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.search-container {
    position: relative;
    display: flex;
    align-items: center;
}

.search-input {
    background: var(--color-bg-secondary);
    border: 1px solid rgba(0, 212, 255, 0.2);
    color: var(--color-text-primary);
    padding: var(--spacing-sm) var(--spacing-md) var(--spacing-sm) 40px;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    width: 250px;
    transition: all var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 2px rgba(0, 212, 255, 0.2);
}

.search-icon {
    position: absolute;
    left: 12px;
    width: 18px;
    height: 18px;
    fill: var(--color-text-muted);
    pointer-events: none;
}

.refresh-btn {
    background: transparent;
    border: 1px solid rgba(0, 212, 255, 0.2);
    color: var(--color-text-secondary);
    padding: var(--spacing-sm);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.refresh-btn svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

.refresh-btn:hover {
    border-color: var(--color-accent-primary);
    color: var(--color-accent-primary);
    transform: rotate(90deg);
}

.track-list {
    background: rgba(26, 26, 46, 0.8);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(0, 212, 255, 0.1);
    backdrop-filter: blur(10px);
    overflow: hidden;
    margin-bottom: var(--spacing-xl);
}

.track-item {
    display: grid;
    grid-template-columns: auto 1fr auto auto;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid rgba(0, 212, 255, 0.05);
    cursor: pointer;
    transition: all var(--transition-fast);
    gap: var(--spacing-md);
}

.track-item:hover {
    background: rgba(0, 212, 255, 0.05);
}

.track-item.playing {
    background: rgba(0, 212, 255, 0.1);
    border-left: 4px solid var(--color-accent-primary);
}

.track-number {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    font-weight: 500;
    min-width: 30px;
    text-align: center;
}

.track-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    min-width: 0;
}

.track-name {
    font-weight: 600;
    color: var(--color-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

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

.track-duration {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    font-family: var(--font-family-mono);
    min-width: 50px;
    text-align: right;
}

.track-actions {
    display: flex;
    gap: var(--spacing-xs);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.track-item:hover .track-actions {
    opacity: 1;
}

.track-action-btn {
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.track-action-btn:hover {
    color: var(--color-accent-primary);
    background: rgba(0, 212, 255, 0.1);
}

.track-action-btn svg {
    width: 16px;
    height: 16px;
    fill: currentColor;
}

/* Visualizer View */
.visualizer-container {
    position: relative;
    width: 100%;
    height: 70vh;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 1px solid rgba(0, 212, 255, 0.1);
    box-shadow: var(--shadow-card);
}

.visualizer-canvas {
    width: 100% !important;
    height: 100% !important;
    display: block;
    object-fit: contain;
}

.visualizer-controls {
    position: absolute;
    bottom: var(--spacing-lg);
    left: var(--spacing-lg);
    right: var(--spacing-lg);
    background: rgba(26, 26, 46, 0.9);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    border: 1px solid rgba(0, 212, 255, 0.2);
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    align-items: center;
    justify-content: space-between;
}

.visualizer-presets,
.visualizer-settings {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.visualizer-preset-select {
    background: var(--color-bg-secondary);
    border: 1px solid rgba(0, 212, 255, 0.2);
    color: var(--color-text-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    cursor: pointer;
}

.setting-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.setting-group label {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    white-space: nowrap;
}

.setting-group input[type="range"],
.setting-group select {
    background: var(--color-bg-secondary);
    border: 1px solid rgba(0, 212, 255, 0.2);
    color: var(--color-text-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    cursor: pointer;
}

/* Settings View */
.settings-container {
    max-width: 800px;
    margin: 0 auto;
}

.settings-container h2 {
    font-size: 2rem;
    font-weight: 700;
    background: var(--gradient-quantum);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.settings-group {
    background: rgba(26, 26, 46, 0.8);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    border: 1px solid rgba(0, 212, 255, 0.1);
    backdrop-filter: blur(10px);
}

.settings-group h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-primary);
    border-bottom: 1px solid rgba(0, 212, 255, 0.1);
    padding-bottom: var(--spacing-sm);
}

.setting-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid rgba(0, 212, 255, 0.05);
}

.setting-item:last-child {
    border-bottom: none;
}

.setting-item label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 500;
    color: var(--color-text-primary);
    cursor: pointer;
}

.setting-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--color-accent-primary);
}

.setting-item select,
.setting-item input[type="number"] {
    background: var(--color-bg-secondary);
    border: 1px solid rgba(0, 212, 255, 0.2);
    color: var(--color-text-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    cursor: pointer;
    min-width: 150px;
}

.settings-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-xl);
}

.btn-primary,
.btn-secondary {
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.btn-primary {
    background: var(--gradient-quantum);
    color: white;
    box-shadow: var(--shadow-button);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-quantum);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text-secondary);
    border: 1px solid rgba(0, 212, 255, 0.2);
}

.btn-secondary:hover {
    border-color: var(--color-accent-primary);
    color: var(--color-accent-primary);
    background: rgba(0, 212, 255, 0.05);
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    backdrop-filter: blur(5px);
    transition: opacity var(--transition-normal);
}

.modal.hidden {
    opacity: 0;
    visibility: hidden;
}

.modal-content {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(0, 212, 255, 0.2);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow: auto;
    box-shadow: var(--shadow-card);
    animation: modalSlideIn var(--transition-normal) ease-out;
}

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

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border-bottom: 1px solid rgba(0, 212, 255, 0.1);
}

.modal-header h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    color: var(--color-accent-primary);
    background: rgba(0, 212, 255, 0.1);
}

.modal-body {
    padding: var(--spacing-lg);
}

.share-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.share-option {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.share-option label {
    font-weight: 500;
    color: var(--color-text-secondary);
}

.url-container {
    display: flex;
    gap: var(--spacing-sm);
}

.url-input,
.embed-textarea {
    flex: 1;
    background: var(--color-bg-primary);
    border: 1px solid rgba(0, 212, 255, 0.2);
    color: var(--color-text-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-family: var(--font-family-mono);
}

.embed-textarea {
    resize: vertical;
    min-height: 80px;
}

.copy-btn {
    background: var(--color-accent-primary);
    border: none;
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.copy-btn:hover {
    background: var(--color-accent-secondary);
    transform: translateY(-1px);
}

.share-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.share-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 500;
    transition: all var(--transition-fast);
    flex: 1;
    min-width: 120px;
}

.share-btn.twitter {
    background: #1da1f2;
    color: white;
}

.share-btn.facebook {
    background: #4267b2;
    color: white;
}

.share-btn.email {
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    border: 1px solid rgba(0, 212, 255, 0.2);
}

.share-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

/* Notifications */
.notifications {
    position: fixed;
    top: calc(var(--spacing-lg) + 50px);
    right: var(--spacing-lg);
    z-index: calc(var(--z-modal) + 1);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-width: 400px;
}

.notification {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    border-left: 4px solid var(--color-accent-primary);
    box-shadow: var(--shadow-card);
    backdrop-filter: blur(10px);
    animation: notificationSlideIn var(--transition-normal) ease-out;
    position: relative;
    overflow: hidden;
}

.notification.success {
    border-left-color: #00c851;
}

.notification.error {
    border-left-color: var(--color-accent-danger);
}

.notification.warning {
    border-left-color: #ffbb33;
}

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

.notification-content {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
}

.notification-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    margin-top: 2px;
}

.notification-text {
    flex: 1;
    font-size: 0.9rem;
    color: var(--color-text-primary);
    line-height: 1.4;
}

.notification-close {
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: 0;
    margin-left: var(--spacing-sm);
    font-size: 1.2rem;
    line-height: 1;
}

.notification-close:hover {
    color: var(--color-text-primary);
}

/* Loading States */
.loading-tracks,
.loading-spinner {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xxl);
    color: var(--color-text-secondary);
}

/* Error Message Styles */
.error-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xxl);
    text-align: center;
    color: var(--color-text-primary);
    background: rgba(255, 23, 68, 0.1);
    border: 1px solid rgba(255, 23, 68, 0.3);
    border-radius: var(--radius-lg);
    margin: var(--spacing-lg);
}

.error-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.error-message h3 {
    color: var(--color-accent-danger);
    margin-bottom: var(--spacing-sm);
    font-size: 1.2rem;
}

.error-message p {
    margin-bottom: var(--spacing-lg);
    line-height: 1.5;
}

.error-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    justify-content: center;
}

.retry-btn,
.fallback-btn {
    background: var(--color-accent-primary);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 500;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.retry-btn:hover,
.fallback-btn:hover {
    background: var(--color-accent-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-button);
}

.fallback-btn {
    background: var(--color-accent-secondary);
}

.fallback-btn:hover {
    background: var(--color-accent-primary);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(0, 212, 255, 0.1);
    border-top: 3px solid var(--color-accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: var(--spacing-md);
}

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

/* Utility Classes */
.hidden {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .album-art-container {
        width: 280px;
        height: 280px;
    }
}

@media (max-width: 1024px) {
    .track-info-section {
        grid-template-columns: 300px 1fr;
        gap: var(--spacing-xl);
    }

    .album-art-container {
        width: 280px;
        height: 280px;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-xs: 0.2rem;
        --spacing-sm: 0.4rem;
        --spacing-md: 0.8rem;
        --spacing-lg: 1.2rem;
        --spacing-xl: 1.6rem;
        --spacing-xxl: 2.4rem;
    }

    .app-header {
        padding: var(--spacing-md);
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .header-nav {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }

    .nav-btn {
        flex: 1;
        min-width: 80px;
        justify-content: center;
    }

    .app-main {
        padding: var(--spacing-md);
    }

    .track-info-section {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-xl);
    }

    .album-art-container {
        width: 240px;
        height: 240px;
        justify-self: center;
    }

    .track-details {
        text-align: center;
        justify-self: center;
    }

    .track-meta {
        justify-content: center;
    }

    .track-title {
        font-size: 1.5rem;
    }

    .track-artist {
        font-size: 1.1rem;
    }

    .eq-bands {
        grid-template-columns: repeat(auto-fit, minmax(35px, 1fr));
        gap: var(--spacing-xs);
    }

    .eq-band-slider {
        height: 50px;
        width: 5px;
    }

    .eq-band-analyzer {
        height: 50px;
    }

    .eq-advanced {
        grid-template-columns: 1fr;
    }

    .secondary-controls {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-md);
    }

    .volume-container {
        justify-content: center;
    }

    .volume-slider {
        width: 150px;
    }

    .library-header {
        flex-direction: column;
        align-items: stretch;
    }

    .library-controls {
        justify-content: center;
    }

    .search-input {
        width: 100%;
        max-width: 300px;
    }

    .track-item {
        grid-template-columns: auto 1fr auto;
        gap: var(--spacing-sm);
    }

    .track-duration {
        order: 3;
    }

    .track-actions {
        display: none;
    }

    .visualizer-controls {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-md);
    }

    .visualizer-settings {
        flex-wrap: wrap;
        justify-content: center;
    }

    .setting-group {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-xs);
    }

    .modal-content {
        width: 95%;
        margin: var(--spacing-md);
    }

    .share-buttons {
        flex-direction: column;
    }

    .settings-actions {
        flex-direction: column;
        align-items: stretch;
    }
}

@media (max-width: 480px) {
    .track-info-section {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-lg);
    }

    .album-art-container {
        width: 200px;
        height: 200px;
        justify-self: center;
    }

    .track-details {
        text-align: center;
        justify-self: center;
    }

    .track-meta {
        justify-content: center;
    }

    .track-title {
        font-size: 1.3rem;
    }

    .primary-controls {
        gap: var(--spacing-md);
    }

    .control-btn.primary {
        width: 56px;
        height: 56px;
    }

    .control-btn.primary svg {
        width: 28px;
        height: 28px;
    }

    .track-meta {
        flex-direction: column;
        gap: var(--spacing-xs);
    }

    .eq-bands {
        grid-template-columns: repeat(auto-fit, minmax(30px, 1fr));
        gap: 2px;
    }

    .eq-band-slider {
        height: 40px;
        width: 4px;
    }

    .eq-band-analyzer {
        height: 40px;
        width: 3px;
    }

    .eq-band-label {
        font-size: 0.55rem;
    }

    .eq-band-value {
        font-size: 0.5rem;
    }

    .notifications {
        left: var(--spacing-sm);
        right: var(--spacing-sm);
        top: calc(var(--spacing-sm) + 50px);
        max-width: none;
    }
}

/* High DPI / Retina Display Support */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .album-art,
    .visualizer-canvas {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .quantum-particles,
    .quantum-wave,
    .logo-icon {
        animation: none;
    }
}

/* Dark Mode Support (System Preference) */
@media (prefers-color-scheme: light) {
    .theme-auto {
        --color-bg-primary: #f8f9fa;
        --color-bg-secondary: #ffffff;
        --color-bg-tertiary: #e9ecef;
        --color-text-primary: #212529;
        --color-text-secondary: #6c757d;
        --color-text-muted: #adb5bd;
        --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.1);
    }
}

/* Print Styles */
@media print {
    .app-header,
    .player-controls,
    .visualizer-view,
    .modal,
    .notifications {
        display: none !important;
    }

    .app-main {
        padding: 0;
    }

    .track-list {
        background: none;
        border: 1px solid #000;
    }

    .track-item {
        break-inside: avoid;
        border-bottom: 1px solid #ccc;
    }

    * {
        color: #000 !important;
        background: #fff !important;
    }
}

/* SVG Stop Color Classes */
.stop-primary {
    stop-color: #00d4ff;
}

.stop-secondary {
    stop-color: #7b68ee;
}

.stop-danger {
    stop-color: #ff1744;
}

/* Equalizer level classes */
.eq-level-zero {
    height: 0%;
}

/* Playlist Styles */
.playlist-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    background: var(--color-bg-secondary);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.playlist-item:hover {
    background: var(--color-bg-tertiary);
    border-color: var(--color-accent-primary);
    box-shadow: var(--shadow-card);
    transform: translateY(-1px);
}

.playlist-content {
    flex: 1;
    min-width: 0;
}

.playlist-name {
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.playlist-info {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.playlist-actions {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    margin-left: var(--spacing-md);
}

.edit-playlist-btn {
    background: transparent;
    border: 1px solid var(--color-accent-primary);
    color: var(--color-accent-primary);
    width: 28px;
    height: 28px;
    border-radius: var(--radius-full);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: bold;
    line-height: 1;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.edit-playlist-btn:hover {
    background: var(--color-accent-primary);
    color: var(--color-bg-primary);
    box-shadow: 0 4px 15px rgba(0, 212, 255, 0.3);
    transform: scale(1.1);
}

.delete-playlist-btn {
    background: transparent;
    border: 1px solid var(--color-accent-danger);
    color: var(--color-accent-danger);
    width: 28px;
    height: 28px;
    border-radius: var(--radius-full);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: bold;
    line-height: 1;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.delete-playlist-btn:hover {
    background: var(--color-accent-danger);
    color: var(--color-text-primary);
    box-shadow: 0 4px 15px rgba(255, 23, 68, 0.3);
    transform: scale(1.1);
}

/* ============================================
   PLAYLIST MODALS
   ============================================ */

.library-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    animation: fadeIn 0.2s ease-out;
}

.library-modal .modal-content {
    background: var(--color-bg-secondary);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    max-width: 500px;
    width: 90%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    animation: slideUp 0.3s ease-out;
}

.add-to-playlist-modal h3,
.create-playlist-modal h3 {
    color: var(--color-text-primary);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    font-weight: 600;
}

.playlist-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-height: 300px;
    overflow-y: auto;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-sm);
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-md);
}

.playlist-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: rgba(0, 212, 255, 0.05);
    border: 1px solid rgba(0, 212, 255, 0.1);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
}

.playlist-option:hover {
    background: rgba(0, 212, 255, 0.1);
    border-color: rgba(0, 212, 255, 0.3);
    transform: translateX(4px);
}

.playlist-option input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--color-accent-primary);
}

.playlist-option span {
    color: var(--color-text-primary);
    font-size: 0.9rem;
}

.new-playlist-option {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.new-playlist-input,
.playlist-name-input {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-size: 0.9rem;
    outline: none;
    transition: all 0.2s ease;
}

.new-playlist-input:focus,
.playlist-name-input:focus {
    border-color: var(--color-accent-primary);
    background: rgba(0, 0, 0, 0.4);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.create-playlist-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--gradient-accent);
    color: var(--color-text-primary);
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.create-playlist-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 212, 255, 0.3);
}

.modal-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
}

.modal-actions button {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-text-secondary);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    color: var(--color-text-primary);
}

.btn-primary {
    background: var(--gradient-accent);
    color: var(--color-text-primary);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 212, 255, 0.3);
}

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

@keyframes slideUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}
/* ========================================
   THEME SUPPORT
   ======================================== */

/* Dark Theme (Default) */
body.theme-dark {
    --color-bg-primary: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-bg-tertiary: #1a1a2e;
    --color-text-primary: #ffffff;
    --color-text-secondary: #b8b8d1;
    --color-border: rgba(255, 255, 255, 0.1);
    --color-accent: #00d4ff;
}

/* Light Theme */
body.theme-light {
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f5f5f7;
    --color-bg-tertiary: #e8e8ed;
    --color-text-primary: #1a1a2e;
    --color-text-secondary: #4a4a5e;
    --color-border: rgba(0, 0, 0, 0.1);
    --color-accent: #0066cc;
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
}

body.theme-light .app-header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

body.theme-light .app-main {
    background: var(--color-bg-secondary);
}

body.theme-light .player-container,
body.theme-light .library-container,
body.theme-light .settings-container,
body.theme-light .visualizer-container {
    background: var(--color-bg-primary);
}

body.theme-light .control-btn,
body.theme-light .nav-btn,
body.theme-light .btn-primary,
body.theme-light .btn-secondary {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

body.theme-light .control-btn:hover,
body.theme-light .nav-btn:hover {
    background: var(--color-bg-secondary);
}

/* Quantum Theme */
body.theme-quantum {
    --color-bg-primary: #0d0020;
    --color-bg-secondary: #1a0033;
    --color-bg-tertiary: #2d0052;
    --color-text-primary: #e0b3ff;
    --color-text-secondary: #b380d9;
    --color-border: rgba(224, 179, 255, 0.2);
    --color-accent: #b380d9;
    --gradient-accent: linear-gradient(135deg, #b380d9 0%, #7b68ee 100%);
    background: radial-gradient(ellipse at center, #1a0033 0%, #0d0020 100%);
}

body.theme-quantum .app-header {
    background: rgba(29, 0, 51, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: 0 4px 20px rgba(179, 128, 217, 0.2);
}

body.theme-quantum .control-btn,
body.theme-quantum .nav-btn {
    background: linear-gradient(135deg, rgba(179, 128, 217, 0.2) 0%, rgba(123, 104, 238, 0.2) 100%);
    border: 1px solid rgba(224, 179, 255, 0.3);
}

body.theme-quantum .control-btn:hover,
body.theme-quantum .nav-btn:hover {
    background: linear-gradient(135deg, rgba(179, 128, 217, 0.3) 0%, rgba(123, 104, 238, 0.3) 100%);
    box-shadow: 0 0 20px rgba(179, 128, 217, 0.4);
}

body.theme-quantum .progress-bar,
body.theme-quantum .volume-slider {
    accent-color: #b380d9;
}

/* Auto Theme (uses system preference) */
body.theme-auto {
    /* Will be overridden by theme-dark or theme-light based on system preference */
}

/* Smooth theme transitions */
body {
    transition: background-color 0.3s ease, color 0.3s ease;
}

.app-header,
.app-main,
.control-btn,
.nav-btn,
.btn-primary,
.btn-secondary,
.player-container,
.library-container,
.settings-container,
.visualizer-container {
    transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* ========================================
   NEW THEMES - MUSIC INSPIRED
   ======================================== */

/* Sunset Wave Theme - Warm sunset colors */
body.theme-sunset-wave {
    --color-bg-primary: #1a0a0a;
    --color-bg-secondary: #2d1810;
    --color-bg-tertiary: #4a2818;
    --color-text-primary: #ffe4d0;
    --color-text-secondary: #ffb088;
    --color-border: rgba(255, 152, 88, 0.2);
    --color-accent: #ff6b35;
    --gradient-accent: linear-gradient(135deg, #ff6b35 0%, #f7931e 50%, #e91e63 100%);
    background: linear-gradient(180deg, #1a0a0a 0%, #2d1810 50%, #1a0a0a 100%);
}

body.theme-sunset-wave .app-header {
    background: rgba(45, 24, 16, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: 0 4px 20px rgba(255, 107, 53, 0.2);
    border-bottom: 1px solid rgba(255, 152, 88, 0.2);
}

body.theme-sunset-wave .control-btn,
body.theme-sunset-wave .nav-btn {
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.2) 0%, rgba(247, 147, 30, 0.2) 100%);
    border: 1px solid rgba(255, 152, 88, 0.3);
}

body.theme-sunset-wave .control-btn:hover,
body.theme-sunset-wave .nav-btn:hover {
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.3) 0%, rgba(247, 147, 30, 0.3) 100%);
    box-shadow: 0 0 20px rgba(255, 107, 53, 0.4);
}

body.theme-sunset-wave .progress-bar,
body.theme-sunset-wave .volume-slider {
    accent-color: #ff6b35;
}

body.theme-sunset-wave .nav-btn.active {
    background: var(--gradient-accent);
    box-shadow: 0 0 20px rgba(255, 107, 53, 0.5);
}

/* Ocean Depth Theme - Deep blues and teals */
body.theme-ocean-depth {
    --color-bg-primary: #0a1628;
    --color-bg-secondary: #0f2847;
    --color-bg-tertiary: #1a3a5c;
    --color-text-primary: #d0f4ff;
    --color-text-secondary: #88d5e9;
    --color-border: rgba(136, 213, 233, 0.2);
    --color-accent: #00bcd4;
    --gradient-accent: linear-gradient(135deg, #00bcd4 0%, #0097a7 50%, #006064 100%);
    background: linear-gradient(180deg, #0a1628 0%, #0f2847 50%, #0a1628 100%);
}

body.theme-ocean-depth .app-header {
    background: rgba(15, 40, 71, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: 0 4px 20px rgba(0, 188, 212, 0.2);
    border-bottom: 1px solid rgba(136, 213, 233, 0.2);
}

body.theme-ocean-depth .control-btn,
body.theme-ocean-depth .nav-btn {
    background: linear-gradient(135deg, rgba(0, 188, 212, 0.2) 0%, rgba(0, 151, 167, 0.2) 100%);
    border: 1px solid rgba(136, 213, 233, 0.3);
}

body.theme-ocean-depth .control-btn:hover,
body.theme-ocean-depth .nav-btn:hover {
    background: linear-gradient(135deg, rgba(0, 188, 212, 0.3) 0%, rgba(0, 151, 167, 0.3) 100%);
    box-shadow: 0 0 20px rgba(0, 188, 212, 0.4);
}

body.theme-ocean-depth .progress-bar,
body.theme-ocean-depth .volume-slider {
    accent-color: #00bcd4;
}

body.theme-ocean-depth .nav-btn.active {
    background: var(--gradient-accent);
    box-shadow: 0 0 20px rgba(0, 188, 212, 0.5);
}

/* Forest Night Theme - Dark greens and earthy tones */
body.theme-forest-night {
    --color-bg-primary: #0a1a0a;
    --color-bg-secondary: #152d15;
    --color-bg-tertiary: #1f4020;
    --color-text-primary: #d0ffd0;
    --color-text-secondary: #88dd88;
    --color-border: rgba(136, 221, 136, 0.2);
    --color-accent: #4caf50;
    --gradient-accent: linear-gradient(135deg, #4caf50 0%, #66bb6a 50%, #81c784 100%);
    background: linear-gradient(180deg, #0a1a0a 0%, #152d15 50%, #0a1a0a 100%);
}

body.theme-forest-night .app-header {
    background: rgba(21, 45, 21, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: 0 4px 20px rgba(76, 175, 80, 0.2);
    border-bottom: 1px solid rgba(136, 221, 136, 0.2);
}

body.theme-forest-night .control-btn,
body.theme-forest-night .nav-btn {
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.2) 0%, rgba(102, 187, 106, 0.2) 100%);
    border: 1px solid rgba(136, 221, 136, 0.3);
}

body.theme-forest-night .control-btn:hover,
body.theme-forest-night .nav-btn:hover {
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.3) 0%, rgba(102, 187, 106, 0.3) 100%);
    box-shadow: 0 0 20px rgba(76, 175, 80, 0.4);
}

body.theme-forest-night .progress-bar,
body.theme-forest-night .volume-slider {
    accent-color: #4caf50;
}

body.theme-forest-night .nav-btn.active {
    background: var(--gradient-accent);
    box-shadow: 0 0 20px rgba(76, 175, 80, 0.5);
}

/* Neon City Theme - Vibrant cyberpunk neon colors */
body.theme-neon-city {
    --color-bg-primary: #0d0d0d;
    --color-bg-secondary: #1a0a1f;
    --color-bg-tertiary: #2d1a3d;
    --color-text-primary: #ff00ff;
    --color-text-secondary: #ff66ff;
    --color-border: rgba(255, 0, 255, 0.3);
    --color-accent: #ff00ff;
    --gradient-accent: linear-gradient(135deg, #ff00ff 0%, #00ffff 50%, #ffff00 100%);
    background: linear-gradient(180deg, #0d0d0d 0%, #1a0a1f 50%, #0d0d0d 100%);
}

body.theme-neon-city .app-header {
    background: rgba(26, 10, 31, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: 0 4px 20px rgba(255, 0, 255, 0.3);
    border-bottom: 2px solid rgba(255, 0, 255, 0.4);
}

body.theme-neon-city .control-btn,
body.theme-neon-city .nav-btn {
    background: linear-gradient(135deg, rgba(255, 0, 255, 0.2) 0%, rgba(0, 255, 255, 0.2) 100%);
    border: 1px solid rgba(255, 0, 255, 0.4);
    box-shadow: 0 0 10px rgba(255, 0, 255, 0.2);
}

body.theme-neon-city .control-btn:hover,
body.theme-neon-city .nav-btn:hover {
    background: linear-gradient(135deg, rgba(255, 0, 255, 0.3) 0%, rgba(0, 255, 255, 0.3) 100%);
    box-shadow: 0 0 25px rgba(255, 0, 255, 0.5), 0 0 15px rgba(0, 255, 255, 0.3);
}

body.theme-neon-city .progress-bar,
body.theme-neon-city .volume-slider {
    accent-color: #ff00ff;
}

body.theme-neon-city .nav-btn.active {
    background: var(--gradient-accent);
    box-shadow: 0 0 30px rgba(255, 0, 255, 0.6), 0 0 20px rgba(0, 255, 255, 0.4);
    animation: neonPulse 2s ease-in-out infinite;
}

body.theme-neon-city .player-container,
body.theme-neon-city .library-container,
body.theme-neon-city .settings-container {
    box-shadow: 0 0 30px rgba(255, 0, 255, 0.1);
}

@keyframes neonPulse {
    0%, 100% {
        box-shadow: 0 0 30px rgba(255, 0, 255, 0.6), 0 0 20px rgba(0, 255, 255, 0.4);
    }
    50% {
        box-shadow: 0 0 40px rgba(255, 0, 255, 0.8), 0 0 30px rgba(0, 255, 255, 0.6);
    }
}