/* ============================================================
   Image Upscaler — image-upscaler.css
   Prefix: ius-   Accent: #8B5CF6
   ============================================================ */

.ius-section {
    --accent: #8B5CF6;
    padding: 40px 0 80px;
}

/* Upload zone */
.ius-upload-zone {
    display: block;
    border: 2px dashed rgba(139, 92, 246, 0.3);
    border-radius: 16px;
    background: rgba(139, 92, 246, 0.03);
    padding: 56px 24px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    outline: none;
}

.ius-upload-zone:hover,
.ius-upload-zone:focus-visible {
    border-color: rgba(139, 92, 246, 0.6);
    background: rgba(139, 92, 246, 0.07);
}

.ius-upload-zone.ius-drag-over {
    border-color: #8B5CF6;
    background: rgba(139, 92, 246, 0.1);
}

.ius-upload-icon {
    font-size: 3rem;
    color: #8B5CF6;
    opacity: 0.65;
    margin-bottom: 14px;
    display: block;
}

.ius-upload-title {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 6px;
}

.ius-upload-sub {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    margin: 0;
}

/* Top bar */
.ius-top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 12px 18px;
    background: var(--bg-card, #fff);
    border: 1px solid var(--border-color, #E5E7EB);
    border-radius: 12px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.ius-file-info {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
}

.ius-file-icon {
    font-size: 1.5rem;
    color: #8B5CF6;
    flex-shrink: 0;
}

.ius-file-name {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 260px;
}

.ius-dims {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

.ius-change-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    border: 1px solid var(--border-color, #E5E7EB);
    border-radius: 8px;
    background: var(--bg-secondary, #F9FAFB);
    color: var(--text-secondary);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: border-color 0.15s, color 0.15s;
    white-space: nowrap;
}

.ius-change-link:hover {
    border-color: #8B5CF6;
    color: #8B5CF6;
}

/* Layout */
.ius-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 16px;
    align-items: start;
}

/* Controls */
.ius-controls {
    border: 1px solid var(--border-color, #E5E7EB);
    border-radius: 12px;
    padding: 16px;
    background: var(--bg-card, #fff);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.ius-ctrl-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.ius-ctrl-label {
    font-size: 0.78125rem;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.ius-scale-tabs,
.ius-format-tabs {
    display: flex;
    gap: 6px;
}

.ius-scale-tab,
.ius-format-tab {
    flex: 1;
    padding: 8px 4px;
    border: 1px solid var(--border-color, #E5E7EB);
    border-radius: 8px;
    background: var(--bg-secondary, #F9FAFB);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 600;
    transition: all 0.15s;
    text-align: center;
}

.ius-scale-tab.ius-active,
.ius-format-tab.ius-active {
    border-color: #8B5CF6;
    background: rgba(139, 92, 246, 0.1);
    color: #8B5CF6;
}

.ius-scale-tab:hover:not(.ius-active),
.ius-format-tab:hover:not(.ius-active) {
    border-color: #8B5CF6;
    color: #8B5CF6;
}

.ius-fmt-sub {
    display: block;
    font-size: 0.6875rem;
    font-weight: 400;
    color: inherit;
    opacity: 0.7;
}

.ius-scale-hint {
    font-size: 0.8rem;
    color: var(--text-tertiary, #9CA3AF);
    margin: 0;
}

.ius-custom-scale-wrap {
    display: none;
    align-items: center;
    gap: 6px;
}

.ius-custom-input {
    width: 74px;
    padding: 7px 10px;
    border: 1px solid var(--border-color, #E5E7EB);
    border-radius: 8px;
    background: var(--bg-input, #fff);
    color: var(--text-primary);
    font-size: 0.9375rem;
    font-weight: 600;
    outline: none;
    -moz-appearance: textfield;
}

.ius-custom-input::-webkit-outer-spin-button,
.ius-custom-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.ius-custom-input:focus {
    border-color: #8B5CF6;
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.ius-custom-unit {
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--text-primary);
}

.ius-custom-cap {
    font-size: 0.75rem;
    color: var(--text-tertiary, #9CA3AF);
}

.ius-out-dims {
    font-size: 0.8rem;
    font-weight: 600;
    color: #8B5CF6;
    margin: 0;
    min-height: 1.1em;
}

/* Image type presets */
.ius-preset-tabs {
    display: flex;
    gap: 6px;
}

.ius-preset-tab {
    flex: 1;
    padding: 7px 4px;
    border: 1px solid var(--border-color, #E5E7EB);
    border-radius: 8px;
    background: var(--bg-secondary, #F9FAFB);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.8125rem;
    font-weight: 600;
    transition: all 0.15s;
    text-align: center;
}

.ius-preset-tab.ius-active {
    border-color: #8B5CF6;
    background: rgba(139, 92, 246, 0.1);
    color: #8B5CF6;
}

.ius-preset-tab:hover:not(.ius-active) {
    border-color: #8B5CF6;
    color: #8B5CF6;
}

.ius-preset-hint {
    font-size: 0.75rem;
    color: var(--text-tertiary, #9CA3AF);
    margin: 0;
}

/* Keyboard shortcut badge */
.ius-kbd {
    display: inline-block;
    padding: 1px 5px;
    border: 1px solid var(--border-color, #E5E7EB);
    border-radius: 4px;
    font-size: 0.75rem;
    font-family: inherit;
    background: var(--bg-secondary, #F9FAFB);
    color: var(--text-secondary);
}

.ius-val-badge {
    background: rgba(139, 92, 246, 0.12);
    color: #8B5CF6;
    border-radius: 4px;
    padding: 1px 5px;
    font-size: 0.75rem;
    font-weight: 700;
}

.ius-slider {
    width: 100%;
    appearance: none;
    height: 4px;
    border-radius: 2px;
    background: var(--border-color, #E5E7EB);
    outline: none;
    cursor: pointer;
}

.ius-slider::-webkit-slider-thumb {
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #8B5CF6;
    cursor: pointer;
}

.ius-algo-note {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 10px 12px;
    background: rgba(139, 92, 246, 0.06);
    border: 1px solid rgba(139, 92, 246, 0.15);
    border-radius: 8px;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.ius-algo-note i {
    color: #8B5CF6;
    font-size: 1rem;
    margin-top: 1px;
    flex-shrink: 0;
}

.ius-btn-upscale {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 11px 18px;
    background: #8B5CF6;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

.ius-btn-upscale:hover {
    background: #7C3AED;
}

.ius-btn-upscale:disabled {
    background: var(--text-tertiary, #9CA3AF);
    cursor: not-allowed;
}

/* Preview col */
.ius-preview-col {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.ius-preview-tabs {
    display: flex;
    gap: 6px;
}

.ius-prev-tab {
    padding: 7px 14px;
    border: 1px solid var(--border-color, #E5E7EB);
    border-radius: 8px;
    background: var(--bg-secondary, #F9FAFB);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.8125rem;
    font-weight: 600;
    transition: all 0.15s;
}

.ius-prev-tab.ius-active {
    border-color: #8B5CF6;
    background: rgba(139, 92, 246, 0.1);
    color: #8B5CF6;
}

/* Before/After slider */
.ius-baf-wrap {
    position: relative;
    overflow: hidden;
    border-radius: 12px;
    border: 1px solid var(--border-color, #E5E7EB);
    background: #111;
    cursor: ew-resize;
    user-select: none;
    line-height: 0;
    touch-action: none;
}

.ius-baf-canvas {
    display: block;
    width: 100%;
    height: auto;
}

.ius-baf-before-clip {
    position: absolute;
    top: 0;
    left: 0;
    width: 50%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
}

.ius-baf-canvas--before {
    position: absolute;
    top: 0;
    left: 0;
    height: auto;
    pointer-events: none;
}

.ius-baf-handle {
    position: absolute;
    top: 0;
    left: 50%;
    height: 100%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    z-index: 2;
}

.ius-baf-line {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    background: #fff;
    box-shadow: 0 0 6px rgba(0, 0, 0, 0.5);
}

.ius-baf-btn {
    position: relative;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: #fff;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #8B5CF6;
    font-size: 1rem;
    flex-shrink: 0;
}

.ius-baf-label {
    position: absolute;
    bottom: 10px;
    font-size: 0.6875rem;
    font-weight: 700;
    color: #fff;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.6);
    padding: 3px 7px;
    background: rgba(0, 0, 0, 0.4);
    border-radius: 4px;
    pointer-events: none;
    line-height: 1.4;
}

.ius-baf-label--left {
    left: 10px;
}

.ius-baf-label--right {
    right: 10px;
}

.ius-prev-tab i {
    font-size: 0.875rem;
    vertical-align: -1px;
}

.ius-canvases {
    display: grid;
    grid-template-columns: 1fr 4px 1fr;
    gap: 0;
    border: 1px solid var(--border-color, #E5E7EB);
    border-radius: 12px;
    overflow: hidden;
    background: var(--bg-secondary, #F9FAFB);
}

.ius-canvases.ius-single {
    grid-template-columns: 1fr;
}

.ius-canvases.ius-single .ius-pane-divider,
.ius-canvases.ius-single .ius-canvas-pane+.ius-canvas-pane {
    display: none;
}

.ius-canvas-pane {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.ius-pane-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 8px 12px;
    background: var(--bg-card, #fff);
    border-bottom: 1px solid var(--border-color, #E5E7EB);
    margin: 0;
}

.ius-canvas {
    width: 100%;
    height: auto;
    display: block;
}

.ius-pane-divider {
    background: var(--border-color, #E5E7EB);
    width: 1px;
}

.ius-waiting {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    color: var(--text-tertiary, #9CA3AF);
    gap: 10px;
}

.ius-wait-icon {
    font-size: 2rem;
    opacity: 0.4;
}

.ius-waiting p {
    font-size: 0.875rem;
    text-align: center;
    margin: 0;
}

/* Progress */
.ius-progress-wrap {
    display: flex;
    align-items: center;
    gap: 12px;
}

.ius-progress-wrap[hidden] {
    display: none;
}

.ius-progress-bar {
    flex: 1;
    height: 6px;
    background: var(--border-color, #E5E7EB);
    border-radius: 3px;
    overflow: hidden;
}

.ius-progress-fill {
    height: 100%;
    width: 0;
    background: #8B5CF6;
    border-radius: 3px;
    transition: width 0.3s ease;
}

.ius-progress-text {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    white-space: nowrap;
    min-width: 140px;
}

/* Action bar */
.ius-action-bar {
    border: 1px solid var(--border-color, #E5E7EB);
    border-radius: 12px;
    padding: 12px 16px;
    background: var(--bg-card, #fff);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.ius-action-bar[hidden] {
    display: none;
}

.ius-result-info {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.ius-dl-row {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.ius-out-name {
    flex: 1;
    min-width: 150px;
    padding: 8px 12px;
    border: 1px solid var(--border-color, #E5E7EB);
    border-radius: 8px;
    background: var(--bg-input, #fff);
    color: var(--text-primary);
    font-size: 0.875rem;
    outline: none;
}

.ius-out-name:focus {
    border-color: #8B5CF6;
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.ius-btn-dl {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 20px;
    background: #8B5CF6;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
    white-space: nowrap;
}

.ius-btn-dl:hover {
    background: #7C3AED;
}

.ius-btn-zoom {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 9px 14px;
    border: 1px solid var(--border-color, #E5E7EB);
    border-radius: 8px;
    background: var(--bg-secondary, #F9FAFB);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: border-color 0.15s, color 0.15s;
    white-space: nowrap;
}

.ius-btn-zoom:hover {
    border-color: #8B5CF6;
    color: #8B5CF6;
}

/* 100% Zoom modal */
.ius-zoom-modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.75);
    display: flex;
    flex-direction: column;
    padding: 16px;
    box-sizing: border-box;
}

.ius-zoom-modal[hidden] {
    display: none;
}

.ius-zoom-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background: var(--bg-card, #fff);
    border-radius: 12px 12px 0 0;
    border-bottom: 1px solid var(--border-color, #E5E7EB);
    flex-shrink: 0;
}

.ius-zoom-title {
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--text-primary);
}

.ius-zoom-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: 1px solid var(--border-color, #E5E7EB);
    border-radius: 8px;
    background: var(--bg-secondary, #F9FAFB);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1rem;
    transition: border-color 0.15s, color 0.15s;
}

.ius-zoom-close:hover {
    border-color: #8B5CF6;
    color: #8B5CF6;
}

.ius-zoom-viewport {
    flex: 1;
    overflow: auto;
    background: #111;
    cursor: grab;
    position: relative;
}

.ius-zoom-canvas {
    display: block;
    /* Shows at 1:1 pixels — no CSS scaling */
}

.ius-zoom-hint {
    padding: 8px 16px;
    background: var(--bg-card, #fff);
    border-radius: 0 0 12px 12px;
    border-top: 1px solid var(--border-color, #E5E7EB);
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin: 0;
    flex-shrink: 0;
}

@media (max-width: 840px) {
    .ius-section {
        padding: 24px 0 60px;
    }

    .ius-layout {
        grid-template-columns: 1fr;
    }

    .ius-canvases {
        grid-template-columns: 1fr;
    }

    .ius-pane-divider {
        display: none;
    }

    .ius-canvases .ius-canvas-pane+.ius-canvas-pane {
        border-top: 1px solid var(--border-color, #E5E7EB);
    }
}

/* ── Phase 1: Post-process overlay spinner ───────────────── */
.ius-canvas-pane {
    position: relative;
}

.ius-pp-overlay {
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 4;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.15s;
    border-radius: 0 0 11px 11px;
}

.ius-pp-overlay.ius-pp-visible {
    opacity: 1;
    pointer-events: auto;
}

.ius-pp-spinner {
    width: 28px;
    height: 28px;
    border: 3px solid rgba(139, 92, 246, 0.2);
    border-top-color: #8B5CF6;
    border-radius: 50%;
    animation: ius-spin 0.7s linear infinite;
}

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

/* ── Phase 2: Upscale button success flash ───────────────── */
.ius-btn-upscale--success {
    background: #10B981 !important;
}

/* ── Phase 3: Slider sub-label ───────────────────────────── */
.ius-slider-sub {
    display: block;
    font-size: 0.6875rem;
    font-weight: 400;
    color: var(--text-tertiary, #9CA3AF);
    text-transform: none;
    letter-spacing: 0;
    margin-top: 1px;
}

/* ── Phase 5: Custom scale input validation flash ────────── */
@keyframes ius-flash-ok {

    0%,
    100% {
        border-color: var(--border-color, #E5E7EB);
        box-shadow: none;
    }

    50% {
        border-color: #10B981;
        box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
    }
}

@keyframes ius-flash-err {

    0%,
    100% {
        border-color: var(--border-color, #E5E7EB);
        box-shadow: none;
    }

    50% {
        border-color: #EF4444;
        box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
    }
}

.ius-custom-input.ius-flash-ok {
    animation: ius-flash-ok 0.5s ease;
}

.ius-custom-input.ius-flash-err {
    animation: ius-flash-err 0.5s ease;
}

/* ── Phase 8: Ctrl+Enter hint near upscale button ────────── */
.ius-upscale-row {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.ius-upscale-hint {
    font-size: 0.75rem;
    color: var(--text-tertiary, #9CA3AF);
    text-align: center;
    margin: 0;
}