/* ============================================
   Image Color Replacer - Modern Styling with Dark Mode
   Layout: Preview above Settings (like image-cropper)
   ============================================ */

/* CSS Variables - Light Mode (Default) */
/* Theme ported from Log File Viewer (Amber/Orange) */
:root {
    --transition-speed: 0.25s;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;

    /* Primary Colors - Amber/Orange (Log File Viewer theme) */
    --primary: #F59E0B;
    --primary-light: #FEF3C7;
    --primary-dark: #D97706;
    --accent: #D97706;
    --primary-gradient: linear-gradient(135deg, #F59E0B, #D97706);

    /* Status Colors */
    --success: #10B981;
    --success-light: #D1FAE5;
    --warning: #F59E0B;
    --warning-light: #FEF3C7;
    --danger: #EF4444;
    --danger-light: #FEE2E2;
    --info: #3B82F6;
    --info-light: #DBEAFE;

    /* Background Colors */
    --bg: #F8FAFC;
    --bg-elevated: #FFFFFF;
    --bg-secondary: #F1F5F9;
    --bg-tertiary: #E2E8F0;

    /* Text Colors */
    --text: #1E293B;
    --text-secondary: #475569;
    --text-muted: #64748B;
    --text-light: #94A3B8;

    /* Border Colors */
    --border: #E2E8F0;
    --border-light: #F1F5F9;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 35px rgba(0, 0, 0, 0.12);
    --shadow-primary: 0 4px 14px rgba(245, 158, 11, 0.3);
    --shadow-primary-hover: 0 6px 20px rgba(245, 158, 11, 0.4);

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Checkerboard for transparency */
    --checker-light: #f0f0f0;
    --checker-dark: #e0e0e0;

    /* Input */
    --input-bg: #FFFFFF;
    --input-border: #E2E8F0;

    /* Scrollbar */
    --scrollbar-track: var(--bg);
    --scrollbar-thumb: var(--text-light);
    --scrollbar-thumb-hover: var(--text-muted);
}

/* Dark Mode Colors - ported from Log File Viewer */
[data-theme="dark"] {
    --primary: #F59E0B;
    --primary-light: rgba(245, 158, 11, 0.2);
    --primary-dark: #D97706;
    --accent: #FBBF24;
    --primary-gradient: linear-gradient(135deg, #F59E0B, #D97706);

    /* Status Colors */
    --success: #10B981;
    --success-light: rgba(16, 185, 129, 0.2);
    --warning: #F59E0B;
    --warning-light: rgba(245, 158, 11, 0.2);
    --danger: #EF4444;
    --danger-light: rgba(239, 68, 68, 0.2);
    --info: #3B82F6;
    --info-light: rgba(59, 130, 246, 0.2);

    /* Background Colors */
    --bg: #0F172A;
    --bg-elevated: #1E293B;
    --bg-secondary: #334155;
    --bg-tertiary: #475569;

    /* Text Colors */
    --text: #F1F5F9;
    --text-secondary: #CBD5E1;
    --text-muted: #94A3B8;
    --text-light: #64748B;

    /* Border Colors */
    --border: #334155;
    --border-light: #1E293B;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 35px rgba(0, 0, 0, 0.6);
    --shadow-primary: 0 4px 14px rgba(245, 158, 11, 0.2);
    --shadow-primary-hover: 0 6px 20px rgba(245, 158, 11, 0.3);

    /* Checkerboard for transparency */
    --checker-light: #334155;
    --checker-dark: #475569;

    /* Input */
    --input-bg: #334155;
    --input-border: #475569;

    /* Scrollbar */
    --scrollbar-track: var(--bg-elevated);
    --scrollbar-thumb: var(--text-muted);
    --scrollbar-thumb-hover: var(--text-secondary);
}

/* Base Styles */
* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* Container */
.tool-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
.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-gradient);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: 0 4px 15px rgba(245, 158, 11, 0.3);
    flex-shrink: 0;
    transition: background-color var(--transition-speed), box-shadow var(--transition-speed);
}

.tool-icon-wrapper svg,
.tool-icon-wrapper i {
    width: 28px;
    height: 28px;
}

.tool-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin: 0;
    color: var(--primary);
    letter-spacing: -0.02em;
}

.tool-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.7;
}

/* Main Tool Area */
.tool-main {
    background: var(--bg-elevated);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    border: 1px solid var(--border);
    margin-bottom: 2rem;
    transition: background-color var(--transition-speed), border-color var(--transition-speed), box-shadow var(--transition-speed);
}

/* Upload Section */
.upload-section {
    padding: 3rem;
}

.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(--bg-secondary);
    position: relative;
    overflow: hidden;
}

.upload-area::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--primary-light);
    opacity: 0;
    transition: opacity 0.3s ease;
}

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

.upload-area:hover::before,
.upload-area.drag-over::before {
    opacity: 0.5;
}

.upload-content {
    position: relative;
    z-index: 1;
}

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

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

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

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

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

.file-type-badge {
    background: var(--primary-light);
    color: var(--primary);
    padding: 0.35rem 0.85rem;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.upload-hint {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

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

/* Editor Section */
.editor-section {
    background: var(--bg-elevated);
    transition: background-color var(--transition-speed);
}

/* File Info Bar */
.file-info-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.file-info-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text);
    font-size: 0.875rem;
    font-weight: 500;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    padding: 0.45rem 0.85rem;
    border-radius: var(--radius-full);
}

.file-info-item svg,
.file-info-item i {
    color: var(--primary);
    width: 18px;
    height: 18px;
}

/* ============================================
   PREVIEW SECTION - Full Width Above Settings
   ============================================ */
.preview-section {
    padding: 1.5rem;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
}

.preview-header h3 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text);
    margin: 0;
}

.preview-header h3 svg,
.preview-header h3 i {
    color: var(--primary);
}

/* Preview Toggle */
.preview-toggle {
    display: flex;
    gap: 0.25rem;
    background: var(--bg-secondary);
    padding: 0.25rem;
    border-radius: var(--radius-md);
}

.toggle-btn {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.5rem 0.75rem;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

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

.toggle-btn.active {
    background: var(--bg-elevated);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}

/* Preview Container */
.preview-container {
    overflow: auto;
    height: clamp(380px, 58vh, 620px);
    padding: 1.25rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
}

/* The track is always at least the size of the visible area. When the
   image is smaller it flex-centers; when the image is larger the track
   grows to the image size, the container scrolls, and every edge stays
   reachable (no clipped/centered overflow). */
.preview-track {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 100%;
    min-height: 100%;
    width: max-content;
    box-sizing: border-box;
}

.preview-wrapper {
    position: relative;
    display: inline-block;
    flex: 0 0 auto;
    background-image: 
        linear-gradient(45deg, var(--checker-light) 25%, transparent 25%),
        linear-gradient(-45deg, var(--checker-light) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--checker-light) 75%),
        linear-gradient(-45deg, transparent 75%, var(--checker-light) 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    transition: border-color var(--transition-speed);
    cursor: crosshair;
}

.preview-canvas {
    display: block;
    max-width: none;
}

.color-picker-cursor {
    position: absolute;
    pointer-events: none;
    color: var(--primary);
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
    transform: translate(-50%, -50%);
}

.preview-hint {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin: 0.75rem 0 0;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.preview-hint svg,
.preview-hint i {
    color: var(--primary);
}

/* ============================================
   ZOOM CONTROLS - Enhanced with Slider
   ============================================ */
/* Combined preview toolbar (zoom controls + history actions) */
.preview-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.zoom-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.zoom-btn {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: var(--bg-elevated);
    color: var(--text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.zoom-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
}

.zoom-100-text {
    font-size: 0.75rem;
    font-weight: 700;
    font-family: monospace;
}

.zoom-slider {
    width: 120px;
    height: 12px;
    border-radius: var(--radius-full);
    background: var(--primary);
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
    outline: none;
}

.zoom-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--bg-elevated);
    border: 3px solid var(--primary);
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all 0.2s ease;
}

.zoom-slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg), 0 0 0 4px var(--primary-light);
}

.zoom-slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--bg-elevated);
    border: 3px solid var(--primary);
    cursor: pointer;
    box-shadow: var(--shadow-md);
}

.zoom-level {
    min-width: 50px;
    text-align: center;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary);
    background: var(--primary-light);
    padding: 0.35rem 0.75rem;
    border-radius: var(--radius-md);
}

/* ============================================
   SETTINGS SECTION - Below Preview
   ============================================ */
.settings-section {
    padding: 1.5rem;
    background: var(--bg-elevated);
    transition: background-color var(--transition-speed);
}

.settings-header {
    margin-bottom: 1.25rem;
}

.settings-header h3 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text);
    margin: 0;
}

.settings-header h3 svg,
.settings-header h3 i {
    color: var(--primary);
}

/* Settings Grid */
.settings-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
}

.settings-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.25rem 1.35rem;
    transition: background-color var(--transition-speed),
                border-color var(--transition-speed),
                box-shadow var(--transition-speed),
                transform var(--transition-speed);
}

.settings-card:not(.apply-card):hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-sm);
}

.settings-card.apply-card {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    background: transparent;
    border: none;
    padding: 0.75rem 0 0;
}

.settings-card.apply-card:hover {
    box-shadow: none;
}

/* Section Labels */
.section-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.75rem;
}

.section-label svg,
.section-label i {
    color: var(--primary);
    width: 16px;
    height: 16px;
}

/* Color Input Row */
.color-input-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.color-preview-box {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    border: 2px solid var(--border);
    background-image: 
        linear-gradient(45deg, var(--checker-light) 25%, transparent 25%),
        linear-gradient(-45deg, var(--checker-light) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--checker-light) 75%),
        linear-gradient(-45deg, transparent 75%, var(--checker-light) 75%);
    background-size: 8px 8px;
    background-position: 0 0, 0 4px, 4px -4px, -4px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: border-color var(--transition-speed);
}

.no-color-text {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-align: center;
}

.color-input-group {
    flex: 1;
    display: flex;
    gap: 0.5rem;
}

.color-hex-input {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--input-bg);
    color: var(--text);
    font-size: 0.95rem;
    font-family: monospace;
    text-transform: uppercase;
    transition: border-color 0.2s ease;
}

.color-hex-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.color-picker-input {
    width: 48px;
    height: 48px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    padding: 0;
    background: var(--input-bg);
}

.color-picker-input::-webkit-color-swatch-wrapper {
    padding: 4px;
}

.color-picker-input::-webkit-color-swatch {
    border: none;
    border-radius: var(--radius-sm);
}

.pick-color-btn {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: var(--bg-elevated);
    color: var(--text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.pick-color-btn:hover,
.pick-color-btn.active {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
}

.color-info {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Color Presets */
.color-presets {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

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

.color-preset {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
    border: 2px solid var(--border);
    cursor: pointer;
    transition: all 0.2s ease;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.color-preset:hover {
    transform: scale(1.15);
    border-color: var(--text);
}

.color-preset.transparent {
    background-image: 
        linear-gradient(45deg, var(--checker-light) 25%, transparent 25%),
        linear-gradient(-45deg, var(--checker-light) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--checker-light) 75%),
        linear-gradient(-45deg, transparent 75%, var(--checker-light) 75%);
    background-size: 8px 8px;
    background-position: 0 0, 0 4px, 4px -4px, -4px 0;
    color: var(--text-muted);
}

/* Tolerance Control */
.tolerance-control {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.tolerance-slider {
    flex: 1;
    height: 12px;
    border-radius: var(--radius-full);
    background: var(--primary);
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
    outline: none;
}

.tolerance-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--bg-elevated);
    border: 3px solid var(--primary);
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all 0.2s ease;
}

.tolerance-slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg), 0 0 0 4px var(--primary-light);
}

.tolerance-slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--bg-elevated);
    border: 3px solid var(--primary);
    cursor: pointer;
    box-shadow: var(--shadow-md);
}

.tolerance-value {
    min-width: 45px;
    font-weight: 600;
    color: var(--primary);
    font-size: 0.95rem;
}

.tolerance-hint {
    margin: 0.5rem 0 0;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Options Grid */
.options-grid {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.checkbox-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text);
}

.checkbox-option input {
    display: none;
}

.checkbox-custom {
    position: relative;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--input-bg);
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.checkbox-option input:checked + .checkbox-custom {
    background: var(--primary);
    border-color: var(--primary);
}

.checkbox-custom::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 6px;
    height: 10px;
    border: 2px solid white;
    border-top: none;
    border-left: none;
    transform: translate(-50%, -60%) rotate(45deg);
    opacity: 0;
    transition: opacity 0.2s ease;
}

.checkbox-option input:checked + .checkbox-custom::after {
    opacity: 1;
}

/* Format Options */
.format-options {
    display: flex;
    gap: 0.75rem;
}

.format-option {
    flex: 1;
    cursor: pointer;
}

.format-option input {
    display: none;
}

.format-box {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
    background: var(--bg-elevated);
    transition: all 0.2s ease;
}

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

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

/* Action Bar */
.action-bar {
    display: flex;
    justify-content: center;
    gap: 1rem;
    padding: 1.5rem;
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-full);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    border: none;
}

.btn svg,
.btn i {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
    background: var(--primary-gradient);
    transform: translateY(-2px);
    box-shadow: var(--shadow-primary-hover);
}

.btn-primary:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-secondary {
    background: var(--bg-elevated);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--bg);
    border-color: var(--text-muted);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: white;
}

.btn-outline:disabled {
    background: transparent;
    color: var(--text-muted);
    border-color: var(--border);
    cursor: not-allowed;
    transform: none;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-sm svg,
.btn-sm i {
    width: 16px;
    height: 16px;
}

/* History actions (now inside .preview-toolbar) */
.history-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

/* Processing Overlay */
.processing-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.processing-content {
    background: var(--bg-elevated);
    padding: 2.5rem;
    border-radius: var(--radius-xl);
    text-align: center;
    max-width: 350px;
    box-shadow: var(--shadow-xl);
    transition: background-color var(--transition-speed);
}

.processing-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    margin: 0 auto 1.25rem;
    animation: spin 1s linear infinite;
}

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

.processing-text {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text);
    margin: 0 0 0.5rem 0;
}

.processing-subtext {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin: 0;
}

/* Error Message */
.error-message {
    background: var(--danger-light);
    border: 1px solid var(--danger);
    color: var(--danger);
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    margin: 1.25rem;
    font-weight: 500;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

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

.related-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--text);
    font-size: 0.9rem;
    flex-shrink: 0;
}

.related-label svg,
.related-label i {
    color: var(--primary);
    width: 16px;
    height: 16px;
}

.related-links {
    display: flex;
    flex-wrap: nowrap;
    gap: 0.5rem;
    overflow-x: auto;
    scrollbar-width: thin;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 2px;
}

.related-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 0.9rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    white-space: nowrap;
    flex-shrink: 0;
    transition: all 0.2s ease;
    border: 1px solid var(--border);
}

.related-link:hover {
    background: var(--primary-light);
    color: var(--primary);
    border-color: var(--primary);
    transform: translateY(-2px);
}

.related-link svg,
.related-link i {
    width: 16px;
    height: 16px;
}

/* Info Sections */
.info-sections {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.info-card {
    background: var(--bg-elevated);
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.info-card h2 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.3rem;
    color: var(--text);
    margin: 0 0 1.5rem 0;
}

.info-card h2 svg,
.info-card h2 i {
    color: var(--primary);
    width: 24px;
    height: 24px;
}

/* Steps List */
.steps-list {
    counter-reset: step;
    list-style: none;
    padding: 0;
    margin: 0;
}

.steps-list li {
    position: relative;
    padding-left: 3.25rem;
    margin-bottom: 1rem;
    counter-increment: step;
    color: var(--text-secondary);
    line-height: 1.6;
}

.steps-list li:not(:last-child)::after {
    content: '';
    position: absolute;
    left: calc(1rem - 1px);
    top: 2rem;
    bottom: 0;
    width: 2px;
    background: var(--primary-light);
}

.steps-list li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    width: 2rem;
    height: 2rem;
    background: var(--primary-gradient);
    color: white;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
    z-index: 1;
}

.steps-list li:last-child {
    margin-bottom: 0;
}

.steps-list li a {
    color: var(--primary);
    text-decoration: none;
}

.steps-list li a:hover {
    text-decoration: underline;
}

/* Use Cases Grid */
.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
}

.use-case {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.use-case-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-gradient);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
    transition: background-color var(--transition-speed);
}

.use-case-content h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin: 0 0 0.35rem;
}

.use-case-content p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin: 0;
    line-height: 1.5;
}

.use-case-content a {
    color: var(--primary);
    text-decoration: none;
}

.use-case-content a:hover {
    text-decoration: underline;
}

/* Tolerance Guide */
.tolerance-guide {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.tolerance-level {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.tolerance-badge {
    padding: 0.35rem 0.85rem;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 600;
    white-space: nowrap;
    flex-shrink: 0;
}

.tolerance-badge.low {
    background: var(--success-light);
    color: var(--success);
}

.tolerance-badge.medium {
    background: var(--warning-light);
    color: var(--warning);
}

.tolerance-badge.high {
    background: var(--danger-light);
    color: var(--danger);
}

.tolerance-desc strong {
    display: block;
    color: var(--text);
    margin-bottom: 0.25rem;
}

.tolerance-desc p {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* FAQ */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

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

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    background: var(--bg-secondary);
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text);
    text-align: left;
    transition: all 0.2s ease;
}

.faq-question:hover {
    background: var(--bg-tertiary);
}

.faq-question svg,
.faq-question i {
    flex-shrink: 0;
    color: var(--primary);
    width: 20px;
    height: 20px;
    transition: transform 0.3s ease;
}

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

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

.faq-item.active .faq-answer {
    max-height: 300px;
}

.faq-answer p {
    padding: 1rem 1.25rem;
    margin: 0;
    color: var(--text-secondary);
    line-height: 1.7;
    background: var(--bg-elevated);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.faq-answer a {
    color: var(--primary);
    text-decoration: none;
}

.faq-answer a:hover {
    text-decoration: underline;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 900px) {
    .settings-grid {
        grid-template-columns: 1fr;
    }
    
    .use-cases-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .tool-container {
        padding: 1rem;
    }
    
    .tool-title-row {
        gap: 0.75rem;
    }
    
    .tool-icon-wrapper {
        width: 50px;
        height: 50px;
    }
    
    .tool-icon-wrapper svg,
    .tool-icon-wrapper i {
        width: 24px;
        height: 24px;
    }
    
    .upload-section {
        padding: 2rem 1.5rem;
    }
    
    .upload-area {
        padding: 2.5rem 1.5rem;
    }
    
    .file-info-bar {
        gap: 1rem;
        padding: 0.875rem 1rem;
    }
    
    .preview-section,
    .settings-section {
        padding: 1.25rem 1rem;
    }
    
    .preview-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
    
    .preview-container {
        height: clamp(300px, 50vh, 460px);
    }
    
    .zoom-controls {
        gap: 0.5rem;
    }
    
    .zoom-slider {
        width: 80px;
    }
    
    .action-bar {
        flex-direction: column;
        padding: 1.25rem;
    }
    
    .btn {
        width: 100%;
    }
    
    .related-tools {
        align-items: center;
    }
    
    .tolerance-level {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .info-card {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .tool-title-row {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .color-input-row {
        flex-wrap: wrap;
    }
    
    .color-input-group {
        min-width: 100%;
        order: 3;
        margin-top: 0.5rem;
    }
    
    .format-options {
        flex-wrap: wrap;
    }
    
    .format-option {
        flex: 1 1 30%;
    }
    
    .zoom-controls {
        flex-wrap: wrap;
        justify-content: center;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover);
}

/* Selection */
::selection {
    background: rgba(245, 158, 11, 0.25);
    color: var(--text);
}

[data-theme="dark"] ::selection {
    background: rgba(245, 158, 11, 0.35);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.editor-section {
    animation: fadeIn 0.4s ease;
}

/* Inline Loader */
.inline-loader {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 100;
    border-radius: var(--radius-md);
    backdrop-filter: blur(2px);
}

[data-theme="dark"] .inline-loader {
    background: rgba(0, 0, 0, 0.7);
}

.inline-loader-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.inline-loader-text {
    margin-top: 0.75rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: white;
}

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

/* Success Message */
.success-message {
    display: none;
    align-items: center;
    gap: 0.5rem;
    background: var(--success-light);
    border: 1px solid var(--success);
    color: var(--success);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    margin: 0 1.5rem 1rem;
    font-weight: 500;
    font-size: 0.9rem;
    animation: fadeIn 0.3s ease;
}

[data-theme="dark"] .success-message {
    background: rgba(74, 222, 128, 0.1);
    border-color: var(--success);
}

.success-message svg,
.success-message i {
    flex-shrink: 0;
}

/* Replacement Count Badge */
.replacement-count {
    display: none;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: var(--bg-elevated);
    border: 1px solid var(--primary);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary);
}

.replacement-count svg,
.replacement-count i {
    width: 16px;
    height: 16px;
}

/* Apply Hint */
.apply-hint {
    margin: 0;
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: center;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

/* ============================================================
   v2 ADDITIONS — polished components, SURITD TOOLS palette.
   All colours come from existing :root / [data-theme] vars
   so light & dark modes are inherited automatically.
   ============================================================ */

/* (In-tool theme toggle removed — the site header provides the
   global dark-mode switch. No .theme-toggle styles here so they
   cannot leak onto the global header control.) */

/* Floating pixel-colour tooltip while picking */
.cursor-color-info {
    position: fixed;
    z-index: 1000;
    display: none;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.6rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-lg);
    font-size: 0.8rem;
    font-variant-numeric: tabular-nums;
    color: var(--text);
    pointer-events: none;
}
.cursor-color-preview {
    width: 18px;
    height: 18px;
    border-radius: 4px;
    border: 1px solid var(--border);
}

/* Eyedropper / pick buttons sit side by side */
.color-input-row .pick-color-btn + .pick-color-btn { margin-left: 0.4rem; }

/* Recent colours strip */
.recent-colors {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.75rem;
}
.recent-swatch {
    width: 26px;
    height: 26px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    cursor: pointer;
    padding: 0;
    transition: transform 0.15s, box-shadow 0.15s;
}
.recent-swatch:hover {
    transform: scale(1.12);
    box-shadow: var(--shadow-md);
}

/* Replace-mode radio cards */
.mode-options { display: flex; flex-direction: column; gap: 0.5rem; }
.mode-option { cursor: pointer; display: block; }
.mode-option input { position: absolute; opacity: 0; }
.mode-box {
    display: block;
    padding: 0.7rem 0.85rem;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-elevated);
    transition: border-color var(--transition-speed),
                background-color var(--transition-speed);
}
.mode-box strong { display: block; font-size: 0.9rem; color: var(--text); }
.mode-box small { display: block; margin-top: 0.15rem; font-size: 0.78rem; color: var(--text-muted); }
.mode-option input:checked + .mode-box {
    border-color: var(--primary);
    background: var(--primary-light);
}
.mode-option input:focus-visible + .mode-box { outline: 2px solid var(--primary); outline-offset: 2px; }

/* Quality / matte rows in output card */
.quality-row {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-top: 0.75rem;
}
.quality-label { font-size: 0.82rem; color: var(--text-secondary); min-width: 64px; }
.quality-row .tolerance-slider { flex: 1; }
.matte-hint { font-size: 0.75rem; color: var(--text-muted); }

.preset-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.85rem;
}
.preset-row .btn { flex: 1; justify-content: center; cursor: pointer; }

/* Batch queue panel */
.batch-panel {
    margin-top: 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1rem 1.1rem;
}
.batch-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-bottom: 0.75rem;
}
.batch-header h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0;
    font-size: 0.95rem;
    color: var(--text);
}
.batch-header h4 svg, .batch-header h4 i { color: var(--primary); }
.batch-actions { display: flex; gap: 0.5rem; }
.batch-list { display: flex; flex-direction: column; gap: 0.45rem; }
.batch-item {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.5rem 0.65rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
}
.batch-item .sw {
    width: 22px;
    height: 22px;
    border-radius: 5px;
    border: 1px solid var(--border);
    flex-shrink: 0;
}
.batch-item .batch-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-left: auto;
}
.batch-item .batch-del {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    display: inline-flex;
    padding: 0.25rem;
    border-radius: 4px;
    transition: color var(--transition-speed), background-color var(--transition-speed);
}
.batch-item .batch-del:hover { color: var(--danger); background: var(--danger-light); }

/* Transparent swatch checkerboard (source preview, presets, batch) */
.is-transparent,
.color-preview-box.is-transparent {
    background-image:
        linear-gradient(45deg, var(--checker-dark) 25%, transparent 25%),
        linear-gradient(-45deg, var(--checker-dark) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--checker-dark) 75%),
        linear-gradient(-45deg, transparent 75%, var(--checker-dark) 75%);
    background-size: 10px 10px;
    background-position: 0 0, 0 5px, 5px -5px, -5px 0;
    background-color: var(--checker-light) !important;
}

/* Mask overlay canvas sits exactly over the image */
.canvas-mask {
    position: absolute;
    inset: 0;
    pointer-events: none;
    mix-blend-mode: normal;
}

/* Before/After compare slider */
.preview-wrapper { --split: 50%; }
.compare-divider { display: none; }
.preview-wrapper.compare-mode { position: relative; }
.preview-wrapper.compare-mode .canvas-result {
    position: absolute;
    inset: 0;
    clip-path: inset(0 0 0 var(--split));
}
.preview-wrapper.compare-mode .canvas-original { position: relative; }
.preview-wrapper.compare-mode .compare-divider {
    display: block;
    position: absolute;
    top: 0;
    bottom: 0;
    left: var(--split);
    width: 0;
    z-index: 5;
    cursor: ew-resize;
    touch-action: none;
}
.compare-line {
    position: absolute;
    top: 0;
    bottom: 0;
    left: -1px;
    width: 2px;
    background: #fff;
    box-shadow: 0 0 0 1px rgba(0,0,0,0.35);
}
.compare-grip {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 34px;
    height: 34px;
    border-radius: var(--radius-full);
    background: var(--primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
}

/* Refinement: smoother preview/zoom container, nicer focus states */
.preview-container { scroll-behavior: smooth; }
.preview-canvas { image-rendering: auto; }
.btn:focus-visible,
.toggle-btn:focus-visible,
.zoom-btn:focus-visible,
.color-preset:focus-visible,
.recent-swatch:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Active "Compare" toggle uses same styling as other toggles (inherits) */

@media (max-width: 768px) {
    .preset-row .btn { flex: 1 1 100%; }
    .batch-header { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
    .recent-swatch { transition: none; }
}

/* ============================================================
   THEME LOCK — Log File Viewer (Amber/Orange)
   This block is intentionally last and uses !important so the
   site-wide custom_styles.css / constants.php (which load AFTER
   this file in index.php) cannot override the tool theme.
   ============================================================ */
:root {
    --primary: #F59E0B !important;
    --primary-light: #FEF3C7 !important;
    --primary-dark: #D97706 !important;
    --accent: #D97706 !important;
    --primary-gradient: linear-gradient(135deg, #F59E0B, #D97706) !important;
    --shadow-primary: 0 4px 14px rgba(245, 158, 11, 0.3) !important;
    --shadow-primary-hover: 0 6px 20px rgba(245, 158, 11, 0.4) !important;
}

[data-theme="dark"] {
    --primary: #F59E0B !important;
    --primary-light: rgba(245, 158, 11, 0.2) !important;
    --primary-dark: #D97706 !important;
    --accent: #FBBF24 !important;
    --primary-gradient: linear-gradient(135deg, #F59E0B, #D97706) !important;
    --shadow-primary: 0 4px 14px rgba(245, 158, 11, 0.2) !important;
    --shadow-primary-hover: 0 6px 20px rgba(245, 158, 11, 0.3) !important;
}

/* Signature components — forced in case the global sheet styles
   these elements directly (not via the CSS variables). */
.tool-container .tool-icon-wrapper {
    background: var(--primary-gradient) !important;
    box-shadow: 0 4px 15px rgba(245, 158, 11, 0.3) !important;
    color: #fff !important;
}
.tool-container .tool-title {
    color: var(--primary) !important;
}
.tool-container .upload-icon {
    color: var(--primary) !important;
}
.tool-container .btn-primary {
    background: var(--primary-gradient) !important;
    color: #fff !important;
}
.tool-container .btn-primary:disabled {
    background: var(--text-muted) !important;
}
.tool-container .steps-list li::before {
    background: var(--primary-gradient) !important;
    color: #fff !important;
}
.tool-container .use-case-icon {
    background: var(--primary-gradient) !important;
    color: #fff !important;
}
.tool-container .info-card h2 i,
.tool-container .info-card h2 svg,
.tool-container .related-label i,
.tool-container .related-label svg {
    color: var(--primary) !important;
}
.tool-container .related-link:hover {
    background: var(--primary-light) !important;
    color: var(--primary) !important;
    border-color: var(--primary) !important;
}
.tool-container .file-type-badge {
    background: var(--primary-light) !important;
    color: var(--primary-dark) !important;
}
.tool-container .faq-item.active,
.tool-container .faq-item:hover {
    border-color: var(--primary) !important;
}