/* CSS Variables */
:root {
    --color-bg: #0a0a0a;
    --color-bg-elevated: #1a1a1a;
    --color-surface: #2a2a2a;
    --color-text-primary: #f5f5f7;
    --color-text-secondary: #a1a1a6;
    --color-accent: #d4af37;
    --color-accent-subtle: rgba(212, 175, 55, 0.15);
    --color-border: rgba(255, 255, 255, 0.08);
    --font-display: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', sans-serif;
    --font-body: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Helvetica Neue', sans-serif;
    --shadow-subtle: 0 2px 16px rgba(0, 0, 0, 0.4);
    --shadow-elevated: 0 8px 32px rgba(0, 0, 0, 0.6);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    margin: 0;
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Film grain texture overlay */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.03;
    z-index: 9999;
    pointer-events: none;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 60px 40px;
    animation: fadeIn 0.8s var(--transition-smooth);
}

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

h1 {
    margin-bottom: 48px;
    font-size: 56px;
    font-weight: 700;
    color: var(--color-text-primary);
    font-family: var(--font-display);
    letter-spacing: -0.02em;
    line-height: 1.1;
    background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeIn 0.8s var(--transition-smooth) 0.2s both;
}

/* Scene grid (home page) */
.scene-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
    gap: 32px;
}

.scene-card {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: pointer;
    transition: all 0.5s var(--transition-smooth);
    position: relative;
    animation: fadeIn 0.6s var(--transition-smooth) both;
}

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

.scene-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-lg);
    padding: 1px;
    background: linear-gradient(135deg, var(--color-accent), transparent);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.5s var(--transition-smooth);
}

.scene-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-elevated);
    border-color: rgba(212, 175, 55, 0.2);
}

.scene-card:hover::before {
    opacity: 0.6;
}

.scene-preview {
    width: 100%;
    height: 280px;
    background: linear-gradient(135deg, #1a1a1a 0%, #2a2a2a 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

.scene-preview::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 0%, rgba(0, 0, 0, 0.4) 100%);
    pointer-events: none;
}

.scene-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.8s var(--transition-smooth);
}

.scene-card:hover .scene-preview img {
    transform: scale(1.05);
}

.scene-preview .loading {
    color: var(--color-text-secondary);
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.05em;
}

.scene-info {
    padding: 24px;
    position: relative;
}

.scene-info h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--color-text-primary);
    font-family: var(--font-display);
    letter-spacing: -0.01em;
    transition: color 0.3s var(--transition-smooth);
}

.scene-card:hover .scene-info h3 {
    color: var(--color-accent);
}

.scene-info p {
    font-size: 14px;
    color: var(--color-text-secondary);
    font-weight: 500;
    letter-spacing: 0.02em;
}

/* Scene viewer */
.viewer-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.viewer-container.animate-in {
    animation: fadeIn 0.6s var(--transition-smooth);
}

.viewer-header {
    background: rgba(26, 26, 26, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    padding: 24px 40px;
    display: flex;
    align-items: center;
    gap: 32px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.viewer-container.animate-in .viewer-header {
    animation: slideDown 0.6s var(--transition-smooth);
}

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

.back-button {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-primary);
    font-family: var(--font-body);
    transition: all 0.3s var(--transition-smooth);
    display: flex;
    align-items: center;
    gap: 8px;
}

.back-button:hover {
    background: var(--color-accent-subtle);
    border-color: var(--color-accent);
    color: var(--color-accent);
    transform: translateX(-4px);
}

.scene-title h2 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--color-text-primary);
    font-family: var(--font-display);
    letter-spacing: -0.01em;
}

.scene-id-info {
    font-size: 12px;
    color: var(--color-accent);
    font-weight: 500;
    letter-spacing: 0.05em;
    font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
    margin-bottom: 4px;
}

.frame-info {
    font-size: 13px;
    color: var(--color-text-secondary);
    font-weight: 500;
    letter-spacing: 0.02em;
}

/* Frame viewer */
.frame-viewer {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 40px 160px;
    position: relative;
}

.frame-image-container {
    max-width: 90%;
    max-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.frame-image {
    max-width: 100%;
    max-height: 70vh;
    object-fit: contain;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-elevated),
                0 0 0 1px var(--color-border);
}

.frame-image:hover {
    transform: scale(1.01);
}

.no-image {
    padding: 80px 120px;
    background: var(--color-bg-elevated);
    border: 1px dashed var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    text-align: center;
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.05em;
}

/* Combined controls bar */
.controls-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(40px);
    -webkit-backdrop-filter: blur(40px);
    padding: 28px 40px;
    box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.5),
                inset 0 1px 0 var(--color-border);
}

.viewer-container.animate-in .controls-bar {
    animation: slideUp 0.6s var(--transition-smooth) 0.3s both;
}

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

.controls-bar-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 48px;
}

/* Audio controls on the left */
.audio-controls {
    flex: 1;
    min-width: 0;
    max-width: 420px;
}

/* Custom Audio Player */
.audio-player-container {
    width: 100%;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: all 0.3s var(--transition-smooth);
}

.audio-player-container:hover {
    border-color: var(--color-accent);
    background: rgba(42, 42, 42, 0.8);
}

.play-pause-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--color-accent);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s var(--transition-smooth);
    flex-shrink: 0;
    position: relative;
    overflow: hidden;
}

.play-pause-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.2) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.3s var(--transition-smooth);
}

.play-pause-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(212, 175, 55, 0.4);
}

.play-pause-btn:hover::before {
    opacity: 1;
}

.play-pause-btn:active {
    transform: scale(1.05);
}

.play-pause-btn svg {
    width: 16px;
    height: 16px;
    fill: var(--color-bg);
}

.audio-timeline {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-width: 0;
}

.audio-progress {
    width: 100%;
    height: 4px;
    background: var(--color-bg-elevated);
    border-radius: 2px;
    position: relative;
    cursor: pointer;
    overflow: hidden;
}

.audio-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--color-accent) 0%, rgba(212, 175, 55, 0.6) 100%);
    border-radius: 2px;
    width: 0%;
    transition: width 0.1s linear;
    position: relative;
}

.audio-progress-bar::after {
    content: '';
    position: absolute;
    right: -6px;
    top: 50%;
    transform: translateY(-50%);
    width: 12px;
    height: 12px;
    background: var(--color-accent);
    border-radius: 50%;
    box-shadow: 0 2px 8px rgba(212, 175, 55, 0.6);
    opacity: 0;
    transition: opacity 0.3s var(--transition-smooth);
}

.audio-player-container:hover .audio-progress-bar::after {
    opacity: 1;
}

.audio-time {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    color: var(--color-text-secondary);
    font-weight: 500;
    letter-spacing: 0.02em;
    font-variant-numeric: tabular-nums;
}

/* Hide default audio element */
#audio-player {
    display: none;
}

.no-audio {
    color: var(--color-text-secondary);
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.02em;
    padding: 14px 20px;
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    text-align: center;
}

/* Scene info in the middle */
.scene-info-bar {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
    padding: 0 24px;
}

.scene-number {
    font-size: 11px;
    color: var(--color-text-secondary);
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.frame-counter {
    font-size: 20px;
    color: var(--color-text-primary);
    font-weight: 600;
    font-family: var(--font-display);
    letter-spacing: -0.01em;
}

/* Navigation controls on the right */
.nav-controls {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
    justify-content: flex-end;
    max-width: 420px;
}

.nav-controls button {
    background: var(--color-surface);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    font-family: var(--font-body);
    transition: all 0.3s var(--transition-smooth);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.nav-controls button::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-accent), transparent);
    opacity: 0;
    transition: opacity 0.3s var(--transition-smooth);
}

.nav-controls button:hover:not(:disabled) {
    background: var(--color-accent-subtle);
    border-color: var(--color-accent);
    color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-subtle);
}

.nav-controls button:hover:not(:disabled)::before {
    opacity: 0.1;
}

.nav-controls button:active:not(:disabled) {
    transform: translateY(0);
}

.nav-controls button:disabled {
    background: var(--color-bg-elevated);
    border-color: var(--color-border);
    color: var(--color-text-secondary);
    cursor: not-allowed;
    opacity: 0.4;
}

/* Responsive */
@media (max-width: 1024px) {
    .container {
        padding: 40px 32px;
    }

    h1 {
        font-size: 48px;
        margin-bottom: 40px;
    }

    .scene-grid {
        grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
        gap: 24px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 32px 24px;
    }

    h1 {
        font-size: 40px;
        margin-bottom: 32px;
    }

    .scene-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .scene-preview {
        height: 240px;
    }

    .viewer-header {
        padding: 20px 24px;
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }

    .scene-title h2 {
        font-size: 24px;
    }

    .frame-viewer {
        padding: 40px 24px 180px;
    }

    .frame-image-container {
        max-width: 100%;
    }

    .frame-image {
        max-height: 50vh;
    }

    .controls-bar {
        padding: 20px 24px;
    }

    .controls-bar-content {
        flex-direction: column;
        gap: 16px;
    }

    .audio-controls {
        width: 100%;
        max-width: 100%;
    }

    #audio-player {
        max-width: 100%;
    }

    .scene-info-bar {
        width: 100%;
        flex-direction: row;
        justify-content: center;
        gap: 20px;
        padding: 0;
    }

    .nav-controls {
        width: 100%;
        max-width: 100%;
        justify-content: center;
    }

    .nav-controls button {
        flex: 1;
        padding: 14px 20px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 32px;
    }

    .scene-info h3 {
        font-size: 20px;
    }

    .scene-preview {
        height: 200px;
    }
}

/* Smooth page transitions */
@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

/* Dark mode support (already dark, but respects system preferences) */
@media (prefers-color-scheme: light) {
    :root {
        --color-bg: #0a0a0a;
        --color-bg-elevated: #1a1a1a;
        --color-surface: #2a2a2a;
        --color-text-primary: #f5f5f7;
        --color-text-secondary: #a1a1a6;
    }
}