:root {
    --bg: #070d19;
    --bg-card: #0e1829;
    --bg-card-hover: #13213a;
    --bg-elevated: #172640;
    --border: #1d2d46;
    --border-hover: #34547c;
    --text: #e8f0fc;
    --text-muted: #94a8c6;
    --text-dim: #748aaa;
    --accent: #60a5fa;
    --accent-end: #38bdf8;
    --accent-gradient: linear-gradient(135deg, #2563eb, #0284c7);
    --accent-glow: rgba(59, 130, 246, 0.3);
    --teal: #38bdf8;
    --teal-glow: rgba(56, 189, 248, 0.3);
    --green: #00b894;
    --red: #ff6b6b;
    --orange: #fdcb6e;
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.2s ease;
    --sidebar-width: 244px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: radial-gradient(ellipse at 85% 0%, rgba(37, 99, 235, 0.12), transparent 55%), var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* === Header === */
header {
    border-bottom: 1px solid var(--border);
    padding: 16px 24px;
    background: rgba(7, 13, 25, 0.88);
    backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    max-width: 100%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 8px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo h1 {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.logo h1 span {
    background: linear-gradient(135deg, var(--accent), var(--accent-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-muted);
    background: var(--bg-card);
    padding: 6px 12px;
    border-radius: 20px;
    border: 1px solid var(--border);
}

.badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-dim);
    transition: background var(--transition);
}

.badge-dot.active { background: var(--green); box-shadow: 0 0 8px var(--green); }
.badge-dot.unavailable { background: var(--orange); }

/* === App Layout (Sidebar + Content) === */
.app-layout {
    display: flex;
    min-height: calc(100vh - 65px);
}

/* === Sidebar === */
.sidebar {
    width: var(--sidebar-width);
    background: linear-gradient(180deg, #101d33, var(--bg-card) 65%);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: sticky;
    top: 65px;
    height: calc(100vh - 65px);
    flex-shrink: 0;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    padding: 12px 8px;
    gap: 4px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition);
    text-align: left;
    width: 100%;
}

.nav-item:hover {
    background: var(--bg-card-hover);
    color: var(--text);
}

.nav-item:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.nav-item.active {
    background: linear-gradient(110deg, rgba(37, 99, 235, 0.26), rgba(14, 165, 233, 0.12));
    box-shadow: inset 0 0 0 1px rgba(96, 165, 250, 0.25);
    color: #bfdbfe;
}

.nav-item.active svg {
    color: var(--accent);
}

.sidebar-footer {
    padding: 12px 16px;
    border-top: 1px solid var(--border);
}

.sidebar-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.sidebar-star {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 12px;
    color: var(--orange);
    text-decoration: none;
}

.sidebar-star:hover { text-decoration: underline; }

.sidebar-version {
    font-size: 11px;
    color: var(--text-dim);
}

/* === Content Area === */
.content-area {
    flex: 1;
    min-width: 0;
    overflow-y: auto;
}

.tab-content {
    display: none;
    max-width: 1100px;
    margin: 0 auto;
    padding: 32px 24px 80px;
}

.tab-content.active {
    display: block;
}

.hidden { display: none !important; }

/* === Dropzone === */
.dropzone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 64px 24px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
    background: var(--bg-card);
}

.dropzone:hover,
.dropzone.drag-over {
    border-color: var(--accent);
    background: rgba(59, 130, 246, 0.05);
    box-shadow: 0 0 30px var(--accent-glow);
}

.dropzone-icon {
    color: var(--text-dim);
    margin-bottom: 16px;
    transition: color var(--transition);
}

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

.dropzone h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 4px;
}

.dropzone p {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 8px;
}

.dropzone-hint {
    font-size: 12px;
    color: var(--text-dim);
}

/* === Upload Progress === */
.upload-overlay {
    position: fixed;
    inset: 0;
    background: rgba(7, 13, 25, 0.85);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
}

.upload-modal {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 40px;
    text-align: center;
    min-width: 360px;
}

.upload-modal h3 { margin-bottom: 16px; }

.upload-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 16px;
}

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

/* === Video Container === */
.video-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 20px;
}

.video-panel {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    border-bottom: 1px solid var(--border);
}

.panel-label {
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
}

.panel-header-right { display: flex; align-items: center; gap: 8px; }

/* × on a preview panel: drop the current file */
.panel-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition);
}
.panel-close:hover { color: #fff; background: rgba(255, 107, 107, 0.85); border-color: transparent; }

.panel-badge {
    font-size: 11px;
    font-weight: 500;
    color: var(--accent);
    background: rgba(59, 130, 246, 0.1);
    padding: 2px 8px;
    border-radius: 10px;
}

.video-panel video {
    width: 100%;
    display: block;
    background: #000;
    aspect-ratio: 16/9;
    object-fit: contain;
}

.output-placeholder {
    aspect-ratio: 16/9;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    color: var(--text-dim);
}

.output-placeholder p { font-size: 13px; }

/* === Image Container === */
.image-compare-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 20px;
}

.image-panel {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

/* Fixed preview height so Original and Result panels always match and a
   tall portrait photo doesn't take over the screen. */
.image-wrapper {
    position: relative;
    height: clamp(240px, 42vh, 420px);
    display: flex;
    align-items: center;
    justify-content: center;
    background: #000;
}

.image-wrapper img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: contain;
}

.image-wrapper .output-placeholder {
    aspect-ratio: auto;
    height: 100%;
    width: 100%;
}

/* === Info Bar === */
.info-bar {
    display: flex;
    gap: 2px;
    margin-bottom: 24px;
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    overflow: hidden;
}

.info-item {
    flex: 1;
    padding: 10px 16px;
    text-align: center;
}

.info-item + .info-item { border-left: 1px solid var(--border); }

.info-label {
    display: block;
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--text-dim);
    margin-bottom: 2px;
}

.info-value {
    font-size: 14px;
    font-weight: 600;
}

/* === Mode Selector === */
.mode-selector {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 24px;
}

.mode-card {
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: flex-start;
    position: relative;
}

.mode-card:hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
}

.mode-card.selected {
    border-color: var(--teal);
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.14), rgba(56, 189, 248, 0.06));
    box-shadow: 0 0 20px var(--accent-glow);
}

.mode-selector-3 {
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.ultra-icon {
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent);
}

.enhance-icon {
    background: rgba(56, 189, 248, 0.1);
    color: var(--accent-end);
}

.tag-enhance { background: rgba(56, 189, 248, 0.1); color: var(--accent-end); }

.mode-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.basic-icon {
    background: rgba(56, 189, 248, 0.1);
    color: var(--teal);
}

.pro-icon {
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent);
}

.mode-info h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.mode-info p {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.mode-tags { display: flex; gap: 6px; }

.tag {
    font-size: 11px;
    font-weight: 500;
    padding: 2px 8px;
    border-radius: 6px;
}

.tag-fast { background: rgba(56, 189, 248, 0.1); color: var(--teal); }
.tag-server { background: rgba(136, 136, 160, 0.1); color: var(--text-muted); }
.tag-ai { background: rgba(59, 130, 246, 0.1); color: var(--accent); }
.tag-gpu { background: rgba(253, 203, 110, 0.1); color: var(--orange); }
.tag-device { background: rgba(0, 184, 148, 0.12); color: var(--green); }

.pro-warning {
    flex-basis: 100%;
    font-size: 11px;
    color: var(--orange);
    background: rgba(253, 203, 110, 0.08);
    padding: 5px 10px;
    border-radius: 6px;
    text-align: center;
}

.mode-card.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* === Options Row === */
.options-row {
    display: flex;
    align-items: flex-end;
    gap: 24px;
    margin-bottom: 24px;
    padding: 16px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.option-group label {
    display: block;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-dim);
    margin-bottom: 8px;
}

.scale-buttons { display: flex; gap: 6px; }

.scale-btn {
    padding: 8px 20px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    font-family: inherit;
}

.scale-btn:hover { border-color: var(--border-hover); color: var(--text); }

.scale-btn.selected {
    background: var(--accent-gradient);
    border-color: var(--accent);
    color: white;
}

.output-res {
    font-size: 18px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent), var(--teal));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.upscale-btn {
    margin-left: auto;
    padding: 12px 32px;
    background: var(--accent-gradient);
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: inherit;
    white-space: nowrap;
}

.upscale-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 20px var(--accent-glow);
}

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

.upscale-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.options-actions {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 12px;
}

.clear-btn {
    padding: 12px 20px;
    background: rgba(255, 107, 107, 0.1);
    border: 1px solid rgba(255, 107, 107, 0.3);
    border-radius: var(--radius-sm);
    color: #ff6b6b;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: inherit;
    white-space: nowrap;
}

.clear-btn:hover {
    background: rgba(255, 107, 107, 0.2);
    border-color: #ff6b6b;
    color: #ff8787;
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.25);
}

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

.clear-btn-alt {
    background: rgba(59, 130, 246, 0.1);
    border-color: rgba(59, 130, 246, 0.3);
    color: var(--accent-end);
}

.clear-btn-alt:hover {
    background: rgba(59, 130, 246, 0.2);
    border-color: var(--accent);
    color: #fff;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.25);
}

.download-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* === Progress === */
.progress-section {
    padding: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 16px;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
    font-size: 14px;
}

#progress-message, #img-progress-message { color: var(--text-muted); }
#progress-percent, #img-progress-percent { font-weight: 700; color: var(--accent); }

.progress-right { display: flex; align-items: center; gap: 14px; }

.cancel-btn {
    padding: 4px 14px;
    font-size: 12px;
    font-weight: 600;
    font-family: inherit;
    color: var(--red);
    background: transparent;
    border: 1px solid rgba(255, 107, 107, 0.5);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
}

.cancel-btn:hover { background: rgba(255, 107, 107, 0.12); border-color: var(--red); }

.progress-track {
    height: 6px;
    background: var(--bg-elevated);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent), var(--teal));
    border-radius: 3px;
    transition: width 0.3s ease;
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.progress-footer {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    color: var(--text-dim);
}

/* === Download === */
.download-section { margin-bottom: 16px; }

.download-card {
    padding: 24px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.12), rgba(56, 189, 248, 0.08));
    border: 1px solid rgba(96, 165, 250, 0.25);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.download-info h3 {
    font-size: 16px;
    margin-bottom: 4px;
    color: var(--accent-end);
}

.download-info p {
    font-size: 13px;
    color: var(--text-muted);
}

.download-btn {
    padding: 12px 28px;
    background: var(--accent-gradient);
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: inherit;
    white-space: nowrap;
}

.download-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 20px var(--accent-glow);
}

/* === New Video === */
.new-video-row { text-align: center; margin-top: 8px; }

.new-video-btn {
    padding: 10px 20px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    font-size: 13px;
    cursor: pointer;
    transition: all var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-family: inherit;
}

.new-video-btn:hover {
    border-color: var(--border-hover);
    color: var(--text);
}

/* === Footer === */
footer {
    text-align: center;
    padding: 24px;
    border-top: 1px solid var(--border);
    color: var(--text-dim);
    font-size: 12px;
}

/* === Responsive === */
@media (max-width: 900px) {
    .sidebar {
        width: 60px;
    }
    .nav-item span {
        display: none;
    }
    .nav-item {
        justify-content: center;
        padding: 12px;
    }
    .sidebar-footer {
        display: none;
    }
}

@media (max-width: 768px) {
    .app-layout {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        height: auto;
        position: static;
        flex-direction: row;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }
    .sidebar-nav {
        flex-direction: row;
        padding: 8px;
        gap: 4px;
        width: 100%;
    }
    .nav-item {
        flex: 1;
        justify-content: center;
    }
    .nav-item span {
        display: inline;
    }
    .sidebar-footer {
        display: none;
    }
    .video-container { grid-template-columns: 1fr; }
    .image-compare-container { grid-template-columns: 1fr; }
    .mode-selector { grid-template-columns: 1fr; }
    .mode-selector-3 { grid-template-columns: 1fr; }
    .info-bar { flex-wrap: wrap; }
    .info-item { min-width: 33%; }
    .options-row { flex-wrap: wrap; }
    .upscale-btn { margin-left: 0; width: 100%; justify-content: center; }
    .download-card { flex-direction: column; text-align: center; }
}

/* === Comparison Slider === */
.compare-section {
    margin-bottom: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.compare-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    border-bottom: 1px solid var(--border);
}

.compare-hint {
    font-size: 12px;
    color: var(--text-dim);
}

.compare-box {
    position: relative;
    user-select: none;
    touch-action: none;
    background: #000;
    cursor: ew-resize;
}

.compare-box img {
    display: block;
    width: 100%;
    max-height: 600px;
    object-fit: contain;
    pointer-events: none;
}

.compare-before-wrap {
    position: absolute;
    inset: 0;
    width: 50%;
    overflow: hidden;
}

.compare-before-wrap img {
    max-width: none;
    height: 100%;
    object-fit: contain;
}

.compare-handle {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 2px;
    background: var(--accent);
    transform: translateX(-1px);
}

.compare-knob {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.5);
}

/* === Batch === */
.batch-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 16px;
    padding: 16px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    flex-wrap: wrap;
}

.batch-sub { font-size: 13px; color: var(--text-muted); }

.batch-actions { display: flex; gap: 10px; flex-wrap: wrap; }

.face-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-muted);
    cursor: pointer;
    padding: 9px 0;
    text-transform: none;
    letter-spacing: 0;
}

.face-toggle input { accent-color: var(--accent); }

.batch-select {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-family: inherit;
    font-size: 14px;
    padding: 8px 12px;
}

.batch-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 12px;
}

.batch-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.batch-item img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    display: block;
    background: #000;
}

.batch-item-info {
    padding: 8px 10px;
    font-size: 11px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 6px;
}

.batch-item-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.batch-status { flex-shrink: 0; font-weight: 600; }
.batch-status.pending { color: var(--text-dim); }
.batch-status.working { color: var(--accent); }
.batch-status.done { color: var(--green); }
.batch-status.failed { color: var(--red); }

.batch-item a {
    color: var(--teal);
    text-decoration: none;
    flex-shrink: 0;
}

/* === About === */
.header-right { display: flex; align-items: center; gap: 10px; }

.about-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition);
}

.about-btn:hover { color: var(--text); border-color: var(--border-hover); }

.about-overlay {
    position: fixed;
    inset: 0;
    background: rgba(7, 13, 25, 0.85);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 400;
}

.about-modal {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px 44px 28px;
    text-align: center;
    max-width: 420px;
}

.about-modal img { border-radius: 16px; margin-bottom: 12px; }

.about-modal h2 { font-size: 22px; letter-spacing: -0.5px; }

.about-up {
    background: linear-gradient(135deg, var(--accent), var(--accent-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.about-version { font-size: 12px; color: var(--text-dim); margin: 2px 0 10px; }

.about-tagline { font-size: 13px; color: var(--text-muted); margin-bottom: 10px; }

.about-brand { font-size: 14px; margin-bottom: 16px; }

.about-brand a {
    color: var(--teal);
    text-decoration: none;
    font-weight: 600;
}

.about-brand a:hover { text-decoration: underline; }

.about-actions { margin-bottom: 16px; }

.about-github {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 20px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-hover);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition);
}

.about-github:hover { border-color: var(--accent); box-shadow: 0 0 14px var(--accent-glow); }

.about-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

.about-github { cursor: pointer; font-family: inherit; }

.update-status {
    font-size: 12px;
    margin: -6px 0 14px;
    color: var(--text-muted);
}

.update-status.update-ok { color: var(--green); }
.update-status.update-new { color: var(--teal); }
.update-status.update-err { color: var(--orange); }
.update-status a { color: var(--teal); font-weight: 600; }

.footer-link { color: var(--teal); text-decoration: none; }
.footer-link:hover { text-decoration: underline; }

.about-credits { font-size: 11px; color: var(--text-dim); line-height: 1.6; }

.about-credits a { color: var(--text-muted); }

.about-close {
    position: absolute;
    top: 10px;
    right: 14px;
    background: none;
    border: none;
    color: var(--text-dim);
    font-size: 22px;
    cursor: pointer;
    line-height: 1;
}

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

/* === Error Toast === */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-elevated);
    border: 1px solid var(--red);
    color: var(--text);
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    z-index: 300;
    transition: transform 0.3s ease;
    max-width: 500px;
}

.toast.show { transform: translateX(-50%) translateY(0); }

/* === Video Batch === */
.vbatch-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.vbatch-row {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 13px;
}

.vbatch-thumb {
    position: relative;
    flex-shrink: 0;
    width: 96px;
    height: 54px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg-elevated) center / cover no-repeat;
    color: #fff;
    cursor: pointer;
    overflow: hidden;
    padding: 0;
}
.vbatch-thumb:hover { border-color: var(--border-hover); }
.vbatch-play {
    position: absolute;
    inset: 0;
    margin: auto;
    opacity: 0.85;
    filter: drop-shadow(0 1px 3px rgba(0, 0, 0, 0.6));
    transition: transform var(--transition), opacity var(--transition);
}
.vbatch-thumb:hover .vbatch-play { transform: scale(1.15); opacity: 1; }
.vbatch-thumb.no-thumb .vbatch-play { color: var(--text-dim); }
.vbatch-duration {
    position: absolute;
    right: 4px;
    bottom: 3px;
    padding: 0 4px;
    border-radius: 3px;
    background: rgba(0, 0, 0, 0.7);
    font-size: 10px;
    line-height: 15px;
    font-variant-numeric: tabular-nums;
}

.vbatch-name {
    flex: 1;
    min-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.vbatch-size {
    color: var(--text-dim);
    font-size: 12px;
    flex-shrink: 0;
}

.vbatch-bar {
    flex: 2;
    height: 6px;
    background: var(--bg-elevated);
    border-radius: 3px;
    overflow: hidden;
    min-width: 100px;
}

.vbatch-fill {
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, var(--accent), var(--teal));
    border-radius: 3px;
    transition: width 0.3s ease;
}

.size-arrow { color: var(--text-dim); }
.size-after { color: var(--text); font-weight: 600; }
.download-size { font-size: 13px; color: var(--text-muted); margin-top: 2px; }

.vbatch-row .batch-status { min-width: 60px; text-align: right; font-size: 12px; }

.vbatch-save {
    color: var(--teal);
    text-decoration: none;
    flex-shrink: 0;
    font-weight: 600;
}

/* Batch video preview player */
.vpreview-modal {
    width: min(960px, calc(100vw - 32px));
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}
.vpreview-head { display: flex; align-items: center; gap: 10px; padding: 12px 16px; position: relative; }
.vpreview-title { font-weight: 600; font-size: 14px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.vpreview-kind { font-size: 11px; padding: 2px 8px; border-radius: 6px; background: rgba(136, 136, 160, 0.12); color: var(--text-muted); flex-shrink: 0; }
.vpreview-kind.is-result { background: rgba(0, 184, 148, 0.12); color: var(--green); }
.vpreview-head .vpreview-close { position: static; margin-left: auto; }
.vpreview-video { display: block; width: 100%; max-height: 75vh; background: #000; }

/* === Background Remover === */
.bg-setup-card {
    max-width: 520px;
    margin: 60px auto;
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: center;
}

.bg-setup-card h3 { font-size: 18px; }

.bg-setup-card p {
    color: var(--text-muted);
    font-size: 14px;
}

.bg-setup-card .progress-track { width: 100%; }

.bg-setup-status {
    font-size: 13px;
    color: var(--text-muted);
    min-height: 18px;
}

/* Checkerboard behind transparent results */
.image-wrapper.checkerboard {
    background-image:
        linear-gradient(45deg, #26263a 25%, transparent 25%),
        linear-gradient(-45deg, #26263a 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #26263a 75%),
        linear-gradient(-45deg, transparent 75%, #26263a 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0;
    background-color: #1b1b28;
}

#bg-color-picker, #bg-batch-color-picker {
    width: 38px;
    height: 34px;
    padding: 2px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-elevated);
    cursor: pointer;
}

@media (max-width: 640px) {
    .vbatch-row { flex-wrap: wrap; }
    .vbatch-bar { flex-basis: 100%; order: 5; }
}

/* === Sidebar sections === */
.nav-section {
    display: block;
    padding: 14px 16px 6px;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-dim);
}

/* === Magic Eraser === */
.erase-editor {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 16px;
}

.erase-canvas-wrap {
    position: relative;
    width: fit-content;
    max-width: 100%;
    margin: 0 auto;
    background: #000;
    border-radius: var(--radius-sm);
    overflow: hidden;
}

#erase-canvas {
    display: block;
    max-width: 100%;
    max-height: 65vh;
}

#erase-overlay {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    cursor: crosshair;
    touch-action: none;
}

.erase-toolbar {
    display: flex;
    align-items: flex-end;
    gap: 14px;
    flex-wrap: wrap;
    margin-top: 14px;
}

.erase-toolbar .upscale-btn { margin-left: auto; }

.erase-slider {
    accent-color: var(--accent);
    width: 140px;
}

.erase-hint {
    margin-top: 10px;
    font-size: 12px;
    color: var(--text-dim);
}

.restore-toggles {
    display: flex;
    gap: 18px;
    flex-wrap: wrap;
}

/* === Audio tools === */
.audio-file-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    padding: 18px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 16px;
}

.audio-file-card h3 {
    font-size: 16px;
    overflow-wrap: anywhere;
}

.audio-result-row {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    padding: 14px 18px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    margin-bottom: 10px;
}

.audio-result-label {
    min-width: 100px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.audio-result-row audio {
    flex: 1;
    min-width: 220px;
    height: 40px;
}

.audio-save-btn { padding: 9px 18px; }

.master-why {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 20px;
    margin: 16px 0;
}

.master-why h4 {
    font-size: 12px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.master-why li {
    margin: 6px 0 6px 18px;
    font-size: 13px;
    color: var(--text);
}

.tags-panel {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 20px;
    margin-bottom: 16px;
}

.tags-panel h4 {
    font-size: 12px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.tags-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.tags-table td {
    padding: 6px 10px;
    border-top: 1px solid var(--border);
    vertical-align: top;
    overflow-wrap: anywhere;
}

.tags-table td:first-child {
    color: var(--text-muted);
    white-space: nowrap;
    width: 180px;
}

/* === Mastering / Tag Editor detail panels === */
.master-panel {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px 20px;
    margin-bottom: 16px;
}

.master-panel h4 {
    font-size: 11px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.master-panel h4.mt, .master-panel .mt { margin-top: 20px; }

.kv-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.kv-table td { padding: 6px 10px 6px 0; border-top: 1px solid var(--border); vertical-align: top; }
.kv-table td:first-child { color: var(--text-muted); white-space: nowrap; width: 190px; font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; padding-top: 8px; }
.kv-table td.num { font-variant-numeric: tabular-nums; }
.kv-table b { color: var(--text); }
.delta { color: var(--text-muted); }
.delta.up { color: var(--green); }
.delta.down { color: var(--red); }
.good { color: var(--green); font-weight: 600; }
.warn { color: var(--orange); }

.reasons { margin: 6px 0 14px; }
.reason { padding: 6px 0 6px 14px; border-left: 2px solid var(--teal); margin-bottom: 6px; font-size: 13px; color: var(--text); }

.bars { display: flex; align-items: flex-end; gap: 4px; height: 72px; margin-top: 8px; }
.bars i { flex: 1; background: linear-gradient(180deg, var(--accent), var(--teal)); border-radius: 3px 3px 0 0; min-height: 2px; }
.barlabels { display: flex; gap: 4px; margin-top: 6px; font-size: 10px; color: var(--text-dim); }
.barlabels span { flex: 1; text-align: center; }

.master-warn { margin-top: 12px; padding: 10px 12px; border: 1px solid var(--orange); border-radius: var(--radius-sm); color: var(--orange); font-size: 13px; }

.master-wave { width: 100%; height: 130px; display: block; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--bg-elevated); margin-top: 16px; cursor: pointer; }

.transport { display: flex; gap: 12px; margin-top: 14px; flex-wrap: wrap; align-items: center; }
.transport-btn { padding: 10px 22px; }
.ab { display: flex; border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; }
.ab button { font: inherit; font-weight: 600; font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; border: 0; background: var(--bg-elevated); color: var(--text-muted); padding: 10px 16px; cursor: pointer; }
.ab button.on { background: var(--accent); color: #fff; }
.master-time { margin-left: auto; font-variant-numeric: tabular-nums; color: var(--text-muted); font-size: 13px; }
.master-note { margin-top: 10px; font-size: 12px; color: var(--text-dim); }
.master-actions { margin-top: 16px; display: flex; gap: 10px; flex-wrap: wrap; }

.tag-modes { display: flex; gap: 20px; flex-wrap: wrap; }
.tag-fields { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 12px; margin-top: 14px; }
.tag-fields label { display: flex; flex-direction: column; gap: 5px; font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-muted); }
.tag-fields input { background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); font: inherit; font-size: 14px; padding: 8px 10px; }
.tag-field-wide { grid-column: 1 / -1; }
.tag-map { display: flex; height: 22px; border-radius: 4px; overflow: hidden; border: 1px solid var(--border); margin-bottom: 12px; }
.tag-map .cut { background: repeating-linear-gradient(45deg, var(--red) 0 4px, #8e2038 4px 8px); }
.tag-map .keep { background: var(--green); }

.vtools-hint { font-size: 13px; color: var(--text-muted); padding: 9px 0; display: block; }

/* === Mastering tuning === */
.tuning-head { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-bottom: 12px; }
.tuning-head h4 { margin: 0; }
.tuning-reset { margin-left: auto; padding: 7px 14px; font-size: 12px; }
.tuning-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 14px 22px; }
.tune { display: flex; flex-direction: column; gap: 6px; }
.tune-name { font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-muted); display: flex; justify-content: space-between; }
.tune-name b { color: var(--teal); font-variant-numeric: tabular-nums; }
.tune input[type=range] { accent-color: var(--accent); width: 100%; }
.tune-hint { font-size: 11px; color: var(--text-dim); }

/* === Sign in / sign up (public web mode) === */
.auth-body { display: flex; align-items: center; justify-content: center; padding: 24px 16px; }
.auth-card {
    width: 100%;
    max-width: 380px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 28px;
}
.auth-logo { font-size: 24px; font-weight: 700; text-align: center; }
.auth-logo span { color: var(--accent); }
.auth-sub { color: var(--text-muted); font-size: 14px; text-align: center; margin: 6px 0 20px; }
.auth-error {
    background: rgba(255, 107, 107, 0.12);
    border: 1px solid rgba(255, 107, 107, 0.4);
    color: var(--red);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    font-size: 13px;
    margin-bottom: 16px;
}
.auth-form { display: flex; flex-direction: column; gap: 14px; }
.auth-form label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--text-muted); }
.auth-form input {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    padding: 10px 12px;
    font: inherit;
    font-size: 15px;
}
.auth-form input:focus { outline: none; border-color: var(--accent); }
.auth-form .upscale-btn { margin: 6px 0 0; justify-content: center; }
.auth-switch { text-align: center; font-size: 13px; color: var(--text-muted); margin-top: 18px; }
.auth-switch a { color: var(--accent); }

.user-chip { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-muted); }
.user-chip form { display: inline; }
.user-chip button {
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    padding: 4px 10px;
    font: inherit;
    font-size: 12px;
    cursor: pointer;
}
.user-chip button:hover { border-color: var(--border-hover); color: var(--text); }
@media (max-width: 640px) { .user-email { display: none; } }
.auth-mark { display: block; margin: 0 auto 10px; }

/* === Crawlable explainer under each tool (SEO) === */
.seo-content {
    margin: 56px 0 24px;
    padding-top: 40px;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    max-width: 980px;
}
.seo-content h2 { color: var(--text); font-size: 22px; letter-spacing: -0.4px; margin: 34px 0 12px; }
.seo-content h2:first-child { margin-top: 0; }
.seo-content h3 { color: var(--text); font-size: 15px; margin-bottom: 4px; }
.seo-content p { font-size: 14px; line-height: 1.7; }
.seo-intro { font-size: 15px; max-width: 760px; }
.seo-features { list-style: none; display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 12px; margin-top: 22px; }
.seo-features li { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 16px; }
.seo-steps { padding-left: 20px; display: grid; gap: 12px; }
.seo-steps li::marker { color: var(--accent); font-weight: 700; }
.seo-faq details { border-bottom: 1px solid var(--border); padding: 14px 0; }
.seo-faq summary { color: var(--text); font-weight: 600; font-size: 14px; cursor: pointer; }
.seo-faq details p { margin-top: 8px; }
.seo-links { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 26px; }
.seo-links a { color: var(--accent); text-decoration: none; font-weight: 600; font-size: 14px; }
.seo-links a:hover { text-decoration: underline; }