:root {
    --bg-base: #09090b;
    --bg-panel: rgba(24, 24, 27, 0.6);
    --bg-elevated: rgba(39, 39, 42, 0.8);
    --border-color: rgba(63, 63, 70, 0.4);
    --border-hover: rgba(99, 102, 241, 0.5);
    
    --text-primary: #f8fafc;
    --text-secondary: #a1a1aa;
    --text-tertiary: #52525b;
    
    --accent-primary: #6366f1;
    --accent-hover: #4f46e5;
    --accent-purple: #a855f7;
    --accent-glow: rgba(99, 102, 241, 0.2);
    
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-base);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 2rem;
    line-height: 1.5;
    position: relative;
    overflow-x: hidden;
}

/* Atmospheric Background */
.app-background {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: -1;
    background: radial-gradient(circle at 15% 10%, rgba(99, 102, 241, 0.15) 0%, transparent 40%),
                radial-gradient(circle at 85% 20%, rgba(168, 85, 247, 0.15) 0%, transparent 40%),
                radial-gradient(circle at 50% 80%, rgba(99, 102, 241, 0.1) 0%, transparent 50%);
    filter: blur(40px);
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Glassmorphism Panels */
.glass-panel {
    background: var(--bg-panel);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

/* Header */
.app-header {
    text-align: center;
    margin-bottom: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

h1 {
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: linear-gradient(to right, #818cf8, #c084fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 500px;
    margin: 0 auto;
}

h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
}

h3 {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
}

/* Upload Section */
.upload-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.upload-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.group-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.badge {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
    background: var(--bg-elevated);
    padding: 0.2rem 0.6rem;
    border-radius: 99px;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.badge-accent {
    color: #c084fc;
    border-color: rgba(192, 132, 252, 0.3);
    background: rgba(192, 132, 252, 0.05);
}

/* Dropzone */
.dropzone {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    background: rgba(24, 24, 27, 0.3);
    height: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    overflow: hidden;
}

.dropzone:hover {
    border-color: var(--border-hover);
    background: var(--bg-elevated);
}

.dropzone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.dropzone:hover .dropzone-content {
    color: var(--text-primary);
    transform: translateY(-2px);
}

.dropzone .icon {
    width: 32px;
    height: 32px;
    color: var(--text-tertiary);
    transition: var(--transition);
}

.dropzone:hover .icon {
    color: var(--accent-primary);
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

.paste-hint {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.8rem;
    color: var(--text-tertiary);
}

/* Previews */
.preview {
    margin-top: 0.5rem;
    width: 100%;
    aspect-ratio: 16/9;
    border-radius: var(--radius-md);
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    display: none; /* Hidden by default */
}

.preview:not(:empty) {
    display: flex;
}

.preview img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

/* Controls Toolbar */
.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
    padding: 1.25rem 2rem;
}

.button-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.settings-group {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-primary {
    background: var(--text-primary);
    color: var(--bg-base);
}

.btn-primary:not(:disabled):hover {
    background: #e2e8f0;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(255, 255, 255, 0.1);
}

.btn-secondary {
    background: transparent;
    border-color: var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:not(:disabled):hover {
    background: var(--bg-elevated);
    border-color: var(--text-tertiary);
}

.btn-accent {
    background: rgba(99, 102, 241, 0.1);
    color: #818cf8;
    border-color: rgba(99, 102, 241, 0.2);
}

.btn-accent:not(:disabled):hover {
    background: var(--accent-primary);
    color: white;
    box-shadow: 0 4px 12px var(--accent-glow);
}

/* Custom Select */
.control-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.control-group label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.select-wrapper {
    position: relative;
    display: inline-block;
}

.select-wrapper select {
    appearance: none;
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 0.5rem 2.25rem 0.5rem 1rem;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
}

.select-wrapper select:focus, .select-wrapper select:hover {
    border-color: var(--border-hover);
    outline: none;
}

.select-chevron {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-tertiary);
    pointer-events: none;
}

/* Custom Toggle Switch */
.toggle-switch {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
}

.toggle-switch input {
    display: none;
}

.toggle-slider {
    width: 36px;
    height: 20px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: 99px;
    position: relative;
    transition: var(--transition);
}

.toggle-slider::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 14px;
    height: 14px;
    background: var(--text-secondary);
    border-radius: 50%;
    transition: var(--transition);
}

.toggle-switch input:checked + .toggle-slider {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

.toggle-switch input:checked + .toggle-slider::after {
    transform: translateX(16px);
    background: white;
}

.toggle-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    user-select: none;
}

/* Results Section */
.results-section {
    animation: slideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: #4ade80;
    background: rgba(74, 222, 128, 0.1);
    padding: 0.25rem 0.75rem;
    border-radius: 99px;
}

.status-indicator .dot {
    width: 6px;
    height: 6px;
    background: #4ade80;
    border-radius: 50%;
    box-shadow: 0 0 8px #4ade80;
}

.canvas-grid {
    display: grid;
    gap: 2rem;
    margin-bottom: 2rem;
}

.top-grid {
    grid-template-columns: 1fr 1fr;
}

.canvas-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.canvas-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.canvas-wrapper {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    aspect-ratio: 16/9;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

canvas {
    max-width: 100%;
    max-height: 100%;
    display: block;
    object-fit: contain;
}

.main-result {
    margin-bottom: 2rem;
}

.result-wrapper {
    border-color: rgba(168, 85, 247, 0.3);
    box-shadow: 0 0 40px rgba(168, 85, 247, 0.05);
}

/* Info Panel */
.lut-info {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
}

.info-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.code-block {
    font-family: 'ui-monospace', 'SFMono-Regular', 'Menlo', 'Monaco', monospace;
    font-size: 0.85rem;
    color: #cbd5e1;
    line-height: 1.6;
    white-space: pre-wrap;
    word-break: break-all;
}

footer {
    text-align: center;
    padding: 1rem;
    color: var(--text-tertiary);
    font-size: 0.8rem;
}

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

/* Responsiveness */
@media (max-width: 900px) {
    .upload-section { grid-template-columns: 1fr; }
    .top-grid { grid-template-columns: 1fr; }
    .toolbar { flex-direction: column; align-items: stretch; }
    .button-group, .settings-group { flex-direction: column; width: 100%; }
    .btn { width: 100%; }
}