/* ============================================
   4K Image Upscaler - Stylesheet
   Modeled on Image Enhancer layout
   iku- prefix for tool-specific classes
   Brand Blue theme, dark mode support (light default)
   ============================================ */

:root {
    --transition-speed: 0.25s;

    /* Primary Colors - Brand Blue (image tools) */
    --primary: #3399cc;
    --primary-light: #e0f2fe;
    --primary-dark: #2980b9;

    --success: #339966;
    --success-light: #d1fae5;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --danger: #e64e4e;
    --danger-light: #fee2e2;

    /* Background Colors */
    --bg: #f8fafc;
    --bg-elevated: #ffffff;
    --bg-secondary: #f1f5f9;
    --bg-tertiary: #e2e8f0;

    /* Text Colors */
    --text: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;

    /* Border Colors */
    --border: #e2e8f0;
    --border-light: #f1f5f9;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.12);

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Upload area */
    --upload-bg: #fafafa;
    --upload-hover-bg: #eaf5fb;

    /* Checkerboard */
    --checker: #e2e8f0;

    /* Site palette */
    --color-1: #e64e4e;
    --color-2: #3399cc;
    --color-3: #339966;
}

[data-theme="dark"] {
    --primary: #60b8e8;
    --primary-light: rgba(96,184,232,0.12);
    --primary-dark: #3399cc;

    --success: #4ade80;
    --success-light: rgba(74,222,128,0.12);
    --warning: #fbbf24;
    --warning-light: rgba(251,191,36,0.12);
    --danger: #f87171;
    --danger-light: rgba(248,113,113,0.12);

    --bg: #0f172a;
    --bg-elevated: #1e293b;
    --bg-secondary: #334155;
    --bg-tertiary: #475569;

    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --border: #334155;
    --border-light: #475569;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.4);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.5);

    --upload-bg: #1e293b;
    --upload-hover-bg: rgba(51,153,204,0.12);

    --checker: #334155;
}

/* ============================================
   HEADER (enhancer pattern)
   ============================================ */

.tool-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem;
}

.tool-header {
    text-align: center;
    margin-bottom: 2rem;
}

.tool-title-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.tool-icon-wrapper {
    width: 64px;
    height: 64px;
    background: var(--primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    box-shadow: var(--shadow-lg);
    flex-shrink: 0;
}

.tool-icon-wrapper svg,
.tool-icon-wrapper i {
    width: 32px;
    height: 32px;
}

.tool-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin: 0;
    color: var(--primary);
}

.tool-description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.7;
    transition: color var(--transition-speed);
}

.tool-description a {
    color: var(--primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.tool-description a:hover {
    color: var(--primary-dark);
}

/* ============================================
   MAIN TOOL CARD
   ============================================ */

.tool-main {
    overflow: visible !important;
    background: var(--bg-elevated);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border);
    position: relative;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

/* ============================================
   UPLOAD SECTION
   ============================================ */

.iku-upload-section {
    padding: 2.5rem;
}

.iku-upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    padding: 4rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--upload-bg);
    position: relative;
    overflow: hidden;
}

.iku-upload-area:hover,
.iku-upload-area.dragover {
    border-color: var(--primary);
    background: var(--upload-hover-bg);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.iku-upload-icon {
    color: var(--primary);
    margin-bottom: 1.5rem;
    transition: transform 0.3s ease;
}

.iku-upload-icon svg,
.iku-upload-icon i {
    width: 64px;
    height: 64px;
}

.iku-upload-area:hover .iku-upload-icon {
    transform: translateY(-5px);
}

.iku-upload-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text);
    margin: 0 0 0.5rem;
}

.iku-upload-subtitle {
    color: var(--text-secondary);
    margin: 0 0 1rem;
    font-size: 1rem;
}

.iku-file-types {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.iku-file-type-badge {
    padding: 0.25rem 0.75rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all var(--transition-speed);
}

.iku-upload-hint {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg);
    color: var(--text-muted);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    transition: background-color var(--transition-speed);
}

.iku-upload-hint i,
.iku-upload-hint svg {
    width: 14px;
    height: 14px;
}

/* ============================================
   EDITOR SECTION (stacked, enhancer pattern)
   ============================================ */

.iku-editor-section {
    padding: 0;
    animation: iku-fade-in 0.4s ease;
}

/* File Info Bar - fused to top of card */
.iku-file-info-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1.5rem;
    padding: 1.25rem 2rem;
    background: var(--bg-secondary);
    border-radius: calc(var(--radius-xl) - 1px) calc(var(--radius-xl) - 1px) 0 0;
    border-bottom: 1px solid var(--border);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.iku-file-info-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    min-width: 0;
}

.iku-file-info-item i,
.iku-file-info-item svg {
    color: var(--primary);
    flex-shrink: 0;
    width: 16px;
    height: 16px;
}

.iku-file-info-item span {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 260px;
}

.iku-file-bar-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-left: auto;
    padding: 6px 14px;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    white-space: nowrap;
    transition: all var(--transition-speed);
}

.iku-file-bar-btn:hover {
    color: var(--primary);
    border-color: var(--primary);
    background: var(--bg-elevated);
    transform: none;
}

.iku-file-bar-btn svg,
.iku-file-bar-btn i {
    width: 14px;
    height: 14px;
}

/* Stacked panels */
.iku-editor-grid {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.iku-editor-grid > * {
    min-width: 0;
}

.iku-preview-panel,
.iku-settings-panel {
    padding: 2rem;
}

.iku-preview-panel {
    border-bottom: 1px solid var(--border);
}

.iku-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.iku-panel-header h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text);
}

.iku-panel-header h3 i,
.iku-panel-header h3 svg {
    color: var(--primary);
    width: 20px;
    height: 20px;
}

/* Preview */
.iku-preview-container {
    display: flex;
    justify-content: center;
}

.iku-preview-image-wrapper {
    width: 100%;
    min-height: 200px;
    max-height: 420px;
    background:
        linear-gradient(45deg, var(--checker) 25%, transparent 25%),
        linear-gradient(-45deg, var(--checker) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--checker) 75%),
        linear-gradient(-45deg, transparent 75%, var(--checker) 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.iku-preview-image-wrapper img {
    max-width: 100%;
    max-height: 420px;
    object-fit: contain;
    display: block;
}

/* Settings grid: 3 columns on desktop */
.iku-settings-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.iku-settings-grid > * {
    min-width: 0;
}

@media (max-width: 860px) {
    .iku-settings-grid { grid-template-columns: 1fr; }
}

.iku-control-section {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    transition: background-color var(--transition-speed);
}

.iku-section-label {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
}

.iku-section-label i,
.iku-section-label svg {
    color: var(--primary);
    width: 15px;
    height: 15px;
}

/* Scale Options */
.iku-scale-options {
    display: flex;
    gap: 0.5rem;
}

.iku-scale-option {
    flex: 1;
    cursor: pointer;
    min-width: 0;
}

.iku-scale-option input[type="radio"] {
    display: none;
}

.iku-scale-box {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.65rem;
    background: var(--bg-elevated);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    text-align: center;
}

.iku-scale-value {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

.iku-scale-option input:checked + .iku-scale-box {
    border-color: var(--primary);
    background: var(--primary-light);
}

.iku-scale-option input:checked + .iku-scale-box .iku-scale-value {
    color: var(--primary);
}

.iku-scale-option:hover .iku-scale-box {
    border-color: var(--primary);
}

.iku-output-dims {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 0.75rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-top: 0.75rem;
    transition: all var(--transition-speed);
}

.iku-output-dims i,
.iku-output-dims svg {
    color: var(--primary);
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

.iku-output-dims.warning {
    background: var(--warning-light);
    border-color: var(--warning);
    color: var(--warning);
}

.iku-output-dims.warning i,
.iku-output-dims.warning svg {
    color: var(--warning);
}

/* Model Options */
.iku-algo-options {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.iku-algo-option {
    cursor: pointer;
}

.iku-algo-option input[type="radio"] {
    display: none;
}

.iku-algo-box {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--bg-elevated);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
}

.iku-algo-option input:checked + .iku-algo-box {
    border-color: var(--primary);
    background: var(--primary-light);
}

.iku-algo-option:hover .iku-algo-box {
    border-color: var(--primary);
}

.iku-algo-name {
    display: block;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text);
    transition: color var(--transition-speed);
}

.iku-algo-desc {
    display: block;
    font-size: 0.78rem;
    color: var(--text-muted);
    line-height: 1.4;
    margin-top: 0.1rem;
    transition: color var(--transition-speed);
}

/* Format Options */
.iku-format-options {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.iku-format-option {
    cursor: pointer;
}

.iku-format-option input[type="radio"] {
    display: none;
}

.iku-format-label {
    display: block;
    padding: 0.5rem 1.1rem;
    background: var(--bg-elevated);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all 0.2s ease;
    cursor: pointer;
}

.iku-format-option input:checked + .iku-format-label {
    border-color: var(--primary);
    background: var(--primary-light);
    color: var(--primary);
}

.iku-format-option:hover .iku-format-label {
    border-color: var(--primary);
}

/* Engine Info */
.iku-engine-info {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 0.75rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.75rem;
    transition: all var(--transition-speed);
}

.iku-engine-info i,
.iku-engine-info svg {
    color: var(--primary);
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

/* ============================================
   ACTION BAR (fused to bottom of card)
   ============================================ */

.iku-action-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.6rem;
    padding: 1.1rem 1.5rem;
    background: var(--bg-secondary);
    border-radius: 0 0 calc(var(--radius-xl) - 1px) calc(var(--radius-xl) - 1px);
    border-top: 1px solid var(--border);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.iku-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    padding: 0.8rem 1.75rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

.iku-btn i,
.iku-btn svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.iku-btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 2px 8px rgba(51,153,204,0.3);
}

.iku-btn-primary:hover {
    background: var(--primary-dark);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(51,153,204,0.35);
}

.iku-btn-outline {
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--primary) !important;
    box-shadow: none;
}

.iku-btn-outline:hover {
    background: var(--primary);
    color: #fff;
    transform: none;
}

.iku-btn-success {
    background: var(--success);
    color: #fff;
    box-shadow: 0 2px 8px rgba(51,153,102,0.3);
}

.iku-btn-success:hover {
    background: #267a52;
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(51,153,102,0.4);
}

/* ============================================
   PROCESSING OVERLAY (stage dots pattern)
   ============================================ */

.iku-processing-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(3px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9000;
}

.iku-processing-content {
    background: var(--bg-elevated);
    border-radius: var(--radius-xl);
    padding: 2rem 2.5rem;
    text-align: center;
    box-shadow: var(--shadow-xl);
    min-width: 340px;
    max-width: 440px;
    width: 90%;
    border: 1px solid var(--border);
}

.iku-spinner-ring {
    width: 44px;
    height: 44px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: iku-spin 0.8s linear infinite;
    margin: 0 auto 1.5rem;
}

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

.iku-progress-stages {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    margin-bottom: 1.5rem;
}

.iku-stage-dot {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.3rem;
    color: var(--text-muted);
    transition: color 0.3s;
}

.iku-stage-dot i,
.iku-stage-dot svg {
    width: 20px;
    height: 20px;
    padding: 6px;
    background: var(--bg-secondary);
    border-radius: 50%;
    transition: all 0.3s;
    box-sizing: content-box;
}

.iku-stage-dot span {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.iku-stage-dot.active i,
.iku-stage-dot.active svg { background: var(--primary); color: #fff; }
.iku-stage-dot.active      { color: var(--primary); }
.iku-stage-dot.done i,
.iku-stage-dot.done svg    { background: var(--success); color: #fff; }
.iku-stage-dot.done        { color: var(--success); }

.iku-stage-connector {
    width: 28px;
    height: 2px;
    background: var(--border);
    margin: 0 0.25rem 1.1rem;
    flex-shrink: 0;
}

.iku-progress-bar-container {
    width: 100%;
    height: 8px;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: 0.75rem;
}

.iku-progress-bar {
    height: 100%;
    background: var(--primary);
    border-radius: var(--radius-full);
    transition: width 0.4s ease;
    width: 0%;
}

.iku-processing-status {
    color: var(--text);
    font-size: 0.9rem;
    font-weight: 500;
    margin: 0 0 0.25rem;
}

.iku-progress-text {
    color: var(--text);
    font-size: 0.95rem;
    font-weight: 700;
    margin: 0;
}

/* ============================================
   RESULTS SECTION
   ============================================ */

.iku-results-section {
    padding: 2rem;
    animation: iku-fade-in 0.4s ease;
}

.iku-results-header {
    text-align: center;
    margin-bottom: 1.5rem;
}

.iku-results-header h2 {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--success);
    margin: 0;
}

.iku-results-header h2 i,
.iku-results-header h2 svg {
    width: 22px;
    height: 22px;
}

/* Before/After Comparison */
.iku-comparison-wrapper {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: ew-resize;
    user-select: none;
    border: 1px solid var(--border);
    margin: 0 auto 1.25rem;
    background:
        linear-gradient(45deg, var(--checker) 25%, transparent 25%),
        linear-gradient(-45deg, var(--checker) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--checker) 75%),
        linear-gradient(-45deg, transparent 75%, var(--checker) 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0;
}

.iku-comparison-wrapper {
    height: 420px; /* fallback; JS sets the exact height from the image ratio */
}

.iku-comparison-after {
    position: absolute;
    inset: 0;
}

.iku-comparison-after img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.iku-comparison-before {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 50%;
    overflow: hidden;
}

/* Before image is sized by JS to exactly match the after image */
.iku-comparison-before img {
    position: absolute;
    top: 0;
    left: 0;
    display: block;
    object-fit: contain;
}

.iku-comparison-label {
    position: absolute;
    top: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.3rem 0.75rem;
    background: rgba(0,0,0,0.55);
    color: #fff;
    border-radius: var(--radius-full);
    font-size: 0.78rem;
    font-weight: 600;
    z-index: 2;
    pointer-events: none;
}

.iku-comparison-label i,
.iku-comparison-label svg {
    width: 12px;
    height: 12px;
}

.iku-before-label { left: 0.75rem; }
.iku-after-label  { right: 0.75rem; }

.iku-comparison-slider {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 3px;
    background: #fff;
    cursor: ew-resize;
    z-index: 3;
}

.iku-slider-handle {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 36px;
    height: 36px;
    background: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
    color: #1e293b;
}

.iku-slider-handle i,
.iku-slider-handle svg {
    width: 18px;
    height: 18px;
}

/* Stats */
.iku-result-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    padding: 1.25rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    flex-wrap: wrap;
    margin-bottom: 1.25rem;
    transition: background-color var(--transition-speed);
}

.iku-stat-item {
    text-align: center;
}

.iku-stat-arrow i,
.iku-stat-arrow svg {
    color: var(--primary);
    width: 20px;
    height: 20px;
}

.iku-stat-label {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}

.iku-stat-value {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
}

.iku-stat-divider {
    width: 1px;
    height: 36px;
    background: var(--border);
}

/* Download Actions */
.iku-download-actions {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
}

/* ============================================
   RELATED TOOLS
   ============================================ */

.iku-related-tools {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    margin-top: 2rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.iku-related-label {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    flex-shrink: 0;
}

.iku-related-label i,
.iku-related-label svg {
    color: var(--primary);
    width: 15px;
    height: 15px;
}

.iku-related-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.iku-related-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.4rem 0.85rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.iku-related-link:hover {
    background: var(--primary-light);
    color: var(--primary);
    border-color: var(--primary);
}

.iku-related-link i,
.iku-related-link svg {
    color: var(--primary);
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

/* ============================================
   INFO CARDS
   ============================================ */

.iku-info-sections {
    display: grid;
    gap: 1.25rem;
    margin-bottom: 2rem;
}

.iku-info-card {
    padding: 1.5rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.iku-info-card h2 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text);
    margin: 0 0 1rem;
}

.iku-info-card h2 i,
.iku-info-card h2 svg {
    color: var(--primary);
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.iku-info-card p {
    color: var(--text-secondary);
    line-height: 1.65;
    margin: 0 0 0.75rem;
}

.iku-info-card p:last-child { margin-bottom: 0; }

.iku-info-card a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}
.iku-info-card a:hover { text-decoration: underline; }

.iku-steps-list {
    margin: 0;
    padding: 0 0 0 1.5rem;
    color: var(--text-secondary);
}

.iku-steps-list li {
    padding: 0.3rem 0;
    line-height: 1.55;
}

.iku-mode-grid {
    display: grid;
    gap: 0.75rem;
}

.iku-mode-grid > * {
    min-width: 0;
}

.iku-mode-box {
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-speed);
}

.iku-mode-tag {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-sm);
    font-size: 0.76rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.iku-mode-tag.general { background: rgba(51,153,204,0.12); color: var(--color-2); }
.iku-mode-tag.anime   { background: rgba(139,92,246,0.12); color: #8b5cf6; }
.iku-mode-tag.tip     { background: rgba(51,153,102,0.12); color: var(--color-3); }

[data-theme="dark"] .iku-mode-tag.general { color: var(--primary); }
[data-theme="dark"] .iku-mode-tag.anime   { color: #a78bfa; }
[data-theme="dark"] .iku-mode-tag.tip     { color: var(--success); }

.iku-mode-box p {
    margin: 0;
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.55;
}

/* ============================================
   FAQ
   ============================================ */

.iku-faq-list {
    display: grid;
    gap: 0.5rem;
}

.iku-faq-item {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color var(--transition-speed);
}

.iku-faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 0.85rem 1rem;
    background: var(--bg-secondary);
    border: none;
    cursor: pointer;
    text-align: left;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
    gap: 0.75rem;
    transition: all var(--transition-speed);
    transform: none;
}

.iku-faq-question:hover {
    background: var(--bg-tertiary);
    transform: none;
}

.iku-faq-question i,
.iku-faq-question svg {
    color: var(--text-muted);
    flex-shrink: 0;
    transition: transform 0.2s ease;
    width: 18px;
    height: 18px;
}

.iku-faq-item.open .iku-faq-question i,
.iku-faq-item.open .iku-faq-question svg { transform: rotate(180deg); }

.iku-faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.iku-faq-item.open .iku-faq-answer { max-height: 500px; }

.iku-faq-answer p {
    padding: 0.75rem 1rem;
    margin: 0;
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.88rem;
}

/* ============================================
   ERROR MESSAGES
   ============================================ */

.iku-inline-error {
    margin: 0 1.5rem 1.25rem;
    padding: 1rem 1.25rem;
    background: var(--danger-light);
    border: 1px solid var(--danger);
    border-radius: var(--radius-md);
    animation: iku-fade-in 0.3s ease;
}

.iku-inline-error-content {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    color: var(--danger);
}

.iku-inline-error-content i,
.iku-inline-error-content svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    margin-top: 2px;
}

.iku-inline-error-content p {
    margin: 0;
    line-height: 1.5;
    font-size: 0.88rem;
}

.iku-inline-error-content .iku-error-contact {
    margin-top: 0.4rem;
    color: var(--text-secondary);
    font-size: 0.82rem;
}

.iku-inline-error-content .iku-error-contact a {
    color: var(--primary);
    text-decoration: underline;
}

/* Error Toast */
.iku-error-toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 1.25rem;
    background: var(--danger);
    color: #fff;
    border-radius: var(--radius-md);
    font-size: 0.88rem;
    font-weight: 500;
    z-index: 20000;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    max-width: 90%;
    animation: iku-slide-up 0.3s ease;
}

.iku-error-toast i,
.iku-error-toast svg { width: 18px; height: 18px; flex-shrink: 0; }

.iku-toast-close {
    background: none;
    border: none;
    color: #fff;
    cursor: pointer;
    padding: 0;
    opacity: 0.75;
    display: flex;
    transform: none;
    box-shadow: none;
}
.iku-toast-close:hover { opacity: 1; background: none; transform: none; }
.iku-toast-close i,
.iku-toast-close svg { width: 15px; height: 15px; }

@keyframes iku-slide-up {
    from { transform: translateX(-50%) translateY(20px); opacity: 0; }
    to   { transform: translateX(-50%) translateY(0); opacity: 1; }
}

@keyframes iku-fade-in {
    from { opacity: 0; transform: translateY(-4px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
    .tool-container { padding: 1.25rem 1rem 2rem; }
    .iku-upload-section { padding: 1.5rem; }
    .iku-upload-area { padding: 2.5rem 1.25rem; }
    .iku-preview-panel,
    .iku-settings-panel { padding: 1.25rem; }
    .iku-file-info-bar {
        flex-direction: column;
        gap: 0.75rem;
        align-items: flex-start;
        padding: 1rem 1.25rem;
    }
    .iku-file-bar-btn { margin-left: 0; }
    .iku-action-bar { flex-direction: column; }
    .iku-action-bar .iku-btn { width: 100%; }
    .iku-result-stats { padding: 1rem; gap: 1rem; }
    .iku-processing-content { padding: 1.5rem 1.25rem; min-width: 280px; }
    .iku-results-section { padding: 1.25rem; }
    .iku-download-actions { flex-direction: column; }
    .iku-download-actions .iku-btn { width: 100%; }
    .iku-related-tools { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
    .iku-stat-divider { display: none; }
    .iku-scale-options { gap: 0.35rem; }
    .iku-format-options { gap: 0.35rem; }
    .iku-file-info-item span { max-width: 200px; }
}