/* ============================================
   SonicFlow - Motion Interactive Music Portal
   Inspired by Active Theory's motion design
   ============================================ */

/* CSS Variables */
:root {
    --color-bg: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-surface: rgba(255, 255, 255, 0.03);
    --color-surface-hover: rgba(255, 255, 255, 0.06);
    --color-border: rgba(255, 255, 255, 0.08);
    --color-text: #ffffff;
    --color-text-secondary: rgba(255, 255, 255, 0.6);
    --color-text-muted: rgba(255, 255, 255, 0.4);
    --color-accent: #6366f1;
    --color-accent-secondary: #8b5cf6;
    --color-accent-tertiary: #ec4899;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    
    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;
    
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    --transition-bounce: 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 32px;
}

/* Reset & Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

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

/* Motion Canvas Background */
#motion-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

/* Creator Credit */
.creator-credit {
    position: fixed;
    bottom: 120px;
    right: 24px;
    padding: 10px 18px;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    z-index: 999;
    font-family: var(--font-body);
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    transition: var(--transition-base);
}

.creator-credit strong {
    color: var(--color-accent);
    font-weight: 600;
}

.creator-credit:hover {
    background: rgba(99, 102, 241, 0.15);
    border-color: var(--color-accent);
    color: var(--color-text);
}

@media (max-width: 768px) {
    .creator-credit {
        bottom: 140px;
        right: 16px;
        font-size: 0.75rem;
        padding: 8px 14px;
    }
}

/* Navigation */
.nav-floating {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 24px;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    z-index: 1000;
    width: calc(100% - 48px);
    max-width: 1200px;
    transition: var(--transition-base);
}

.nav-floating.scrolled {
    background: rgba(10, 10, 15, 0.95);
    box-shadow: var(--shadow-md);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.1rem;
}

.brand-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-secondary));
    border-radius: var(--radius-sm);
    font-size: 1.2rem;
}

.nav-links {
    display: flex;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-text);
    background: var(--color-surface);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    width: 20px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: var(--transition-fast);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 24px 80px;
    position: relative;
    overflow: hidden;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    z-index: 1;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 10vw, 7rem);
    font-weight: 700;
    line-height: 0.95;
    margin-bottom: 24px;
    letter-spacing: -0.03em;
}

.title-line {
    display: block;
    position: relative;
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-accent-secondary) 50%, var(--color-accent-tertiary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: titleReveal 1s ease-out forwards;
    opacity: 0;
    transform: translateY(30px);
}

.title-line:nth-child(1) { animation-delay: 0.1s; }
.title-line:nth-child(2) { animation-delay: 0.2s; }
.title-line:nth-child(3) { animation-delay: 0.3s; }

@keyframes titleReveal {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: var(--color-text-secondary);
    margin-bottom: 40px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 0.8s ease-out 0.5s forwards;
    opacity: 0;
}

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

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease-out 0.7s forwards;
    opacity: 0;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 32px;
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition-base);
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-secondary));
    color: var(--color-text);
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-accent);
}

.btn-arrow {
    width: 20px;
    height: 20px;
    transition: transform var(--transition-fast);
}

.btn:hover .btn-arrow {
    transform: translateX(4px);
}

/* Floating Shapes */
.hero-visual {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.floating-shapes {
    position: absolute;
    inset: 0;
}

.shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.5;
    animation: float 20s ease-in-out infinite;
}

.shape-1 {
    width: 400px;
    height: 400px;
    background: var(--color-accent);
    top: 10%;
    right: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 300px;
    height: 300px;
    background: var(--color-accent-secondary);
    bottom: 20%;
    left: 10%;
    animation-delay: -7s;
}

.shape-3 {
    width: 250px;
    height: 250px;
    background: var(--color-accent-tertiary);
    top: 50%;
    left: 50%;
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    25% {
        transform: translate(30px, -30px) scale(1.1);
    }
    50% {
        transform: translate(-20px, 20px) scale(0.95);
    }
    75% {
        transform: translate(20px, 10px) scale(1.05);
    }
}

/* Library Section */
.library-section {
    padding: 100px 24px;
    max-width: 1400px;
    margin: 0 auto;
}

.section-header {
    display: flex;
    flex-direction: column;
    gap: 24px;
    margin-bottom: 48px;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.02em;
}

.filter-tabs {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.filter-tab {
    padding: 10px 20px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    color: var(--color-text-secondary);
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

.filter-tab:hover {
    background: var(--color-surface-hover);
    color: var(--color-text);
}

.filter-tab.active {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: var(--color-text);
}

/* Music Grid */
.music-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.music-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    transition: var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.music-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-secondary));
    opacity: 0;
    transition: var(--transition-base);
}

.music-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-accent);
    box-shadow: var(--shadow-lg);
}

.music-card:hover::before {
    opacity: 0.05;
}

.card-visual {
    width: 100%;
    aspect-ratio: 1;
    background: linear-gradient(135deg, var(--color-bg-secondary), var(--color-surface));
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.card-visual::after {
    content: '♪';
    font-size: 4rem;
    opacity: 0.3;
}

.card-play {
    position: absolute;
    width: 60px;
    height: 60px;
    background: var(--color-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: scale(0.8);
    transition: var(--transition-base);
}

.music-card:hover .card-play {
    opacity: 1;
    transform: scale(1);
}

.card-play svg {
    width: 24px;
    height: 24px;
    fill: var(--color-text);
    margin-left: 4px;
}

.card-info {
    position: relative;
    z-index: 1;
}

.card-title {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.card-artist {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    margin-bottom: 12px;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.card-duration {
    display: flex;
    align-items: center;
    gap: 4px;
}

.card-actions {
    display: flex;
    gap: 8px;
}

.card-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.card-btn:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: var(--color-text);
}

.card-btn svg {
    width: 16px;
    height: 16px;
}

/* Upload Section */
.upload-section {
    padding: 100px 24px;
    background: linear-gradient(180deg, transparent 0%, var(--color-bg-secondary) 50%, transparent 100%);
}

.upload-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.upload-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.upload-orb {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-secondary), var(--color-accent-tertiary));
    filter: blur(40px);
    opacity: 0.6;
    animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 0.6;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

.upload-content {
    max-width: 500px;
}

.section-description {
    color: var(--color-text-secondary);
    margin-bottom: 32px;
    font-size: 1.1rem;
}

/* Upload Zone */
.upload-zone {
    position: relative;
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: 48px;
    text-align: center;
    transition: var(--transition-base);
    cursor: pointer;
    background: var(--color-surface);
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--color-accent);
    background: var(--color-surface-hover);
}

.upload-zone.dragover {
    transform: scale(1.02);
}

.upload-zone-content {
    transition: opacity var(--transition-base);
}

.upload-zone.uploading .upload-zone-content {
    opacity: 0;
    pointer-events: none;
}

.upload-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    color: var(--color-accent);
}

.upload-icon svg {
    width: 100%;
    height: 100%;
}

.upload-text {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.upload-hint {
    color: var(--color-text-secondary);
    margin-bottom: 16px;
}

.upload-formats {
    display: inline-block;
    padding: 8px 16px;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-xl);
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* Upload Progress */
.upload-progress {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
}

.upload-zone.uploading .upload-progress {
    opacity: 1;
}

.progress-ring {
    position: relative;
    width: 120px;
    height: 120px;
}

.progress-ring svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.progress-bg {
    fill: none;
    stroke: var(--color-surface);
    stroke-width: 4;
}

.progress-fill {
    fill: none;
    stroke: var(--color-accent);
    stroke-width: 4;
    stroke-linecap: round;
    stroke-dasharray: 283;
    stroke-dashoffset: 283;
    transition: stroke-dashoffset 0.3s ease;
}

.progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
}

/* Audio Player */
.audio-player {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--color-border);
    z-index: 1000;
    transform: translateY(100%);
    transition: transform var(--transition-base);
}

.audio-player.active {
    transform: translateY(0);
}

.player-progress {
    height: 4px;
    background: var(--color-surface);
    cursor: pointer;
}

.progress-bar {
    height: 100%;
    position: relative;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-secondary));
    transition: width 0.1s linear;
}

.player-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    gap: 24px;
}

.player-info {
    display: flex;
    align-items: center;
    gap: 16px;
    flex: 1;
    min-width: 0;
}

.player-artwork {
    width: 56px;
    height: 56px;
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.artwork-placeholder {
    font-size: 1.5rem;
    opacity: 0.5;
}

.player-meta {
    min-width: 0;
}

.player-title {
    font-family: var(--font-display);
    font-size: 0.95rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

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

.player-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

.control-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--color-text);
    cursor: pointer;
    border-radius: 50%;
    transition: var(--transition-fast);
}

.control-btn:hover {
    background: var(--color-surface);
}

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

.play-btn {
    width: 52px;
    height: 52px;
    background: var(--color-accent);
}

.play-btn:hover {
    background: var(--color-accent-secondary);
    transform: scale(1.05);
}

.play-btn .pause-icon {
    display: none;
}

.play-btn.playing .play-icon {
    display: none;
}

.play-btn.playing .pause-icon {
    display: block;
}

.player-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.action-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.action-btn:hover {
    color: var(--color-text);
    background: var(--color-surface);
}

.action-btn svg {
    width: 20px;
    height: 20px;
}

.volume-control {
    display: flex;
    align-items: center;
    gap: 8px;
}

.volume-slider {
    width: 100px;
    height: 4px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--color-surface);
    border-radius: 2px;
    cursor: pointer;
}

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

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

/* Footer */
.footer {
    padding: 60px 24px;
    text-align: center;
    border-top: 1px solid var(--color-border);
    margin-bottom: 100px;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 16px;
}

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

/* Responsive */
@media (max-width: 1024px) {
    .upload-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .upload-visual {
        order: -1;
    }
    
    .upload-orb {
        width: 200px;
        height: 200px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero {
        padding-top: 100px;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }
    
    .music-grid {
        grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
        gap: 16px;
    }
    
    .player-content {
        flex-wrap: wrap;
        gap: 12px;
    }
    
    .player-info {
        width: 100%;
        order: -1;
    }
    
    .player-controls {
        order: 1;
    }
    
    .player-actions {
        order: 2;
    }
    
    .volume-control {
        display: none;
    }
}

@media (max-width: 480px) {
    .nav-floating {
        padding: 10px 16px;
    }
    
    .upload-zone {
        padding: 32px 24px;
    }
    
    .music-card {
        padding: 16px;
    }
}

/* 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;
}