:root {
    --bg-primary: #0a0c14;
    --bg-secondary: #111422;
    --bg-card: rgba(22, 27, 46, 0.7);
    --bg-card-hover: rgba(28, 35, 60, 0.85);
    --border: rgba(255, 255, 255, 0.08);
    --border-accent: rgba(99, 102, 241, 0.3);

    --accent: #6366f1;
    --accent-hover: #4f46e5;
    --accent-glow: rgba(99, 102, 241, 0.4);

    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
    --gradient-card: linear-gradient(145deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0) 100%);

    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --text-dim: #64748b;

    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;

    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-sm: 8px;

    --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
    background-color: var(--bg-primary);
    color: var(--text-main);
    font-family: var(--font-body);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    background-image:
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(236, 72, 153, 0.12) 0px, transparent 50%);
    background-attachment: fixed;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 3rem;
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(12px);
    background: rgba(10, 12, 20, 0.6);
    position: sticky;
    top: 0;
    z-index: 50;
}

.logo-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    width: 38px;
    height: 38px;
    background: var(--gradient-primary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px var(--accent-glow);
}

.logo-text h1 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-text span {
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.status-badge {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.45rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 9999px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--warning);
    box-shadow: 0 0 10px var(--warning);
    transition: all 0.3s ease;
}

.status-dot.ready {
    background: var(--success);
    box-shadow: 0 0 10px var(--success);
}

.status-dot.processing {
    background: var(--accent);
    box-shadow: 0 0 12px var(--accent);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.4;
        transform: scale(1.3);
    }
}

/* Main Container */
main {
    flex: 1;
    max-width: 1300px;
    width: 100%;
    margin: 0 auto;
    padding: 2.5rem 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Controls Grid */
.config-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.25rem 1.75rem;
    backdrop-filter: blur(16px);
}

.model-info-chips {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.chip {
    padding: 0.35rem 0.85rem;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.chip strong {
    color: var(--text-main);
}

.chip.simd-active {
    border-color: rgba(16, 185, 129, 0.3);
    color: #34d399;
}

.config-controls {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    flex-wrap: wrap;
}

.control-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.control-item label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.select-wrapper select {
    background: var(--bg-secondary);
    color: var(--text-main);
    border: 1px solid var(--border);
    padding: 0.45rem 0.85rem;
    border-radius: var(--radius-sm);
    outline: none;
    font-size: 0.85rem;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
}

.select-wrapper select:focus {
    border-color: var(--accent);
}

.select-wrapper select optgroup {
    background: var(--bg-secondary);
    color: var(--accent);
    font-weight: 600;
}

.select-wrapper select option {
    background: var(--bg-primary);
    color: var(--text-main);
    font-weight: normal;
}

/* Upload Section */
.upload-card {
    background: var(--bg-card);
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    padding: 3.5rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(16px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.25rem;
}

.upload-card:hover,
.upload-card.drag-over {
    border-color: var(--accent);
    background: var(--bg-card-hover);
    box-shadow: 0 8px 32px var(--accent-glow);
    transform: translateY(-2px);
}

.upload-icon {
    width: 64px;
    height: 64px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid var(--border-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    transition: transform 0.3s ease;
}

.upload-card:hover .upload-icon {
    transform: scale(1.1);
}

.upload-title {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: 600;
}

.upload-subtitle {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.upload-hint {
    font-size: 0.75rem;
    color: var(--text-dim);
}

/* Workspace / Comparison Section */
.workspace-card {
    display: none;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    backdrop-filter: blur(16px);
    flex-direction: column;
    gap: 1.5rem;
}

.workspace-card.active {
    display: flex;
}

.workspace-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

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

.stat-box {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border);
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-sm);
    display: flex;
    flex-direction: column;
}

.stat-box.stat-highlight {
    border-color: rgba(0, 242, 254, 0.4);
    background: rgba(0, 242, 254, 0.08);
}

.stat-box.stat-highlight .stat-value {
    color: #67e8f9;
}

.stat-box .stat-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    color: var(--text-dim);
    letter-spacing: 0.05em;
}

.stat-box .stat-value {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-main);
    font-family: var(--font-heading);
}

.action-buttons {
    display: flex;
    gap: 0.75rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.65rem 1.4rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-primary:hover:not(:disabled) {
    opacity: 0.95;
    transform: translateY(-1px);
    box-shadow: 0 6px 20px var(--accent-glow);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-main);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Comparison Viewer */
.viewer-container {
    position: relative;
    width: 100%;
    min-height: 480px;
    background: #000;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    user-select: none;
}

.viewer-wrapper {
    position: relative;
    max-width: 100%;
    max-height: 700px;
    display: inline-block;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.8);
}

.viewer-image {
    display: block;
    max-width: 100%;
    max-height: 700px;
    object-fit: contain;
}

.upscaled-overlay {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 50%;
    overflow: hidden;
    border-right: 2px solid white;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.5);
}

.upscaled-overlay canvas,
.upscaled-overlay .viewer-image {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    max-width: none;
    pointer-events: none;
}

.slider-handle {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.6);
    transform: translate(-50%, -50%);
    cursor: ew-resize;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #0f172a;
    z-index: 10;
    transition: transform 0.1s ease, opacity 0.3s ease;
}

.slider-handle:hover {
    transform: translate(-50%, -50%) scale(1.1);
}

.viewer-tag {
    position: absolute;
    bottom: 16px;
    padding: 0.35rem 0.75rem;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
    z-index: 5;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.viewer-tag.tag-left {
    left: 16px;
}

.viewer-tag.tag-right {
    right: 16px;
}

/* Processing State: Show only upscaled image as tiles render */
.viewer-wrapper.is-processing .upscaled-overlay {
    width: 100% !important;
    border-right: none !important;
    box-shadow: none !important;
}

.viewer-wrapper.is-processing .slider-handle {
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
}

.viewer-wrapper.is-processing .viewer-tag.tag-right {
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
}

/* Smooth reveal transition from full upscaled view (100%) to comparison split (50%) */
.viewer-wrapper.slider-revealing .upscaled-overlay {
    transition: width 0.75s cubic-bezier(0.16, 1, 0.3, 1);
}

.viewer-wrapper.slider-revealing .slider-handle {
    transition: left 0.75s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.4s ease;
}

.viewer-wrapper.slider-revealing .viewer-tag.tag-right {
    transition: opacity 0.5s ease;
}

/* Progressive Tile Glow Pulse Effect - High Visibility Neon Laser Reticle */
.tile-glow-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
    z-index: 15;
}

.tile-glow {
    position: absolute;
    box-sizing: border-box;
    /* High-contrast electric cyan border with inner white highlight ring */
    border: 2px solid #00f2fe;
    outline: 1px solid rgba(255, 255, 255, 0.9);
    outline-offset: -2px;
    /* Visible vibrant luminous wash over the entire tile square */
    background: rgba(0, 242, 254, 0.22);
    /* Multi-layered neon bloom */
    box-shadow:
        0 0 16px rgba(0, 242, 254, 1),
        0 0 32px rgba(6, 182, 212, 0.7),
        inset 0 0 14px rgba(0, 242, 254, 0.6);
    border-radius: 2px;
    pointer-events: none;
    min-width: 6px;
    min-height: 6px;
    animation: tileGlowFade 0.85s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes tileGlowFade {
    0% {
        opacity: 1;
        transform: scale(1.02);
        box-shadow:
            0 0 24px rgba(0, 242, 254, 1),
            0 0 40px rgba(0, 242, 254, 0.8),
            inset 0 0 20px rgba(255, 255, 255, 0.9);
    }

    30% {
        /* Hold bright plateau for ~250ms so human eye catches peripheral movement */
        opacity: 0.95;
        transform: scale(1);
        box-shadow:
            0 0 18px rgba(0, 242, 254, 0.95),
            0 0 30px rgba(6, 182, 212, 0.6),
            inset 0 0 14px rgba(0, 242, 254, 0.5);
    }

    100% {
        opacity: 0;
        transform: scale(1);
        box-shadow:
            0 0 2px rgba(0, 242, 254, 0),
            inset 0 0 2px rgba(0, 242, 254, 0);
    }
}

/* Progress / Loading Floating HUD */
.progress-overlay {
    display: none;
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.85rem 1.6rem;
    background: rgba(10, 12, 20, 0.82);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-accent);
    border-radius: var(--radius-md);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.7), 0 0 15px var(--accent-glow);
    z-index: 25;
    align-items: center;
    gap: 1rem;
    pointer-events: none;
    max-width: 90%;
}

.progress-overlay.active {
    display: flex;
}

.progress-content {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    min-width: 260px;
}

.spinner {
    width: 32px;
    height: 32px;
    min-width: 32px;
    border: 2.5px solid rgba(99, 102, 241, 0.2);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.progress-text {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-main);
}

.progress-subtext {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.progress-bar-container {
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
    margin-top: 0.2rem;
}

.progress-bar-fill {
    height: 100%;
    width: 0%;
    background: var(--gradient-primary);
    border-radius: 2px;
    transition: width 0.15s ease;
}

/* Footer */
footer {
    padding: 1.5rem;
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-dim);
    border-top: 1px solid var(--border);
    backdrop-filter: blur(8px);
    background: rgba(10, 12, 20, 0.4);
}