/* ============================================
   Chrome Extension Icon Generator - Styling
   ============================================ */

/* CSS Variables - Light Mode (Default) */
:root {
    --transition-speed: 0.25s;
    
    /* Primary Colors */
    --primary: #3399cc;
    --primary-light: #e0f2fe;
    --primary-dark: #2b82ad;
    --accent: #38bdf8;
    
    /* Brand Colors */
    --color-1: #e64e4e;
    --color-2: #3399cc;
    --color-3: #339966;
    
    /* Status Colors */
    --success: #339966;
    --success-light: #d1fae5;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --danger: #e64e4e;
    --danger-light: #fee2e2;
    --info: #3399cc;
    --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;
    
    /* 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(0,0,0,0.1);
    --shadow-primary: 0 4px 14px rgba(51, 153, 204, 0.25);
    --shadow-primary-hover: 0 6px 20px rgba(51, 153, 204, 0.35);
    
    /* Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Checkerboard */
    --checker-light: #f0f0f0;
    --checker-dark: #e0e0e0;
    
    /* Input */
    --input-bg: #ffffff;
    --input-border: #e2e8f0;
}

/* Dark Mode */
[data-theme="dark"] {
    --primary: #38bdf8;
    --primary-light: rgba(56, 189, 248, 0.15);
    --primary-dark: #0ea5e9;
    --accent: #7dd3fc;
    
    --success: #4ade80;
    --success-light: rgba(74, 222, 128, 0.15);
    --warning: #fbbf24;
    --warning-light: rgba(251, 191, 36, 0.15);
    --danger: #f87171;
    --danger-light: rgba(248, 113, 113, 0.15);
    --info: #60a5fa;
    --info-light: rgba(96, 165, 250, 0.15);
    
    --bg: #0f172a;
    --bg-elevated: #1e293b;
    --bg-secondary: #334155;
    --bg-tertiary: #475569;
    
    --text: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    --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);
    --shadow-primary: 0 4px 14px rgba(56, 189, 248, 0.2);
    --shadow-primary-hover: 0 6px 20px rgba(56, 189, 248, 0.3);
    
    --checker-light: #334155;
    --checker-dark: #475569;
    
    --input-bg: #334155;
    --input-border: #475569;
}

/* Base */
* { 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: 1000px;
    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);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: var(--shadow-primary);
    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(1.5rem, 3.5vw, 2.25rem);
    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-xl);
    overflow: hidden;
    border: 1px solid var(--border);
    margin-bottom: 2rem;
    transition: background-color var(--transition-speed), border-color 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: 1;
}

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

.upload-icon {
    color: var(--primary);
    margin-bottom: 1rem;
    opacity: 0.8;
}

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

.upload-subtitle {
    color: var(--text-muted);
    margin: 0 0 1.25rem;
}

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

.file-type-badge {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.upload-hint {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

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

.file-info-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

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

.new-file-btn {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.new-file-btn:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* Aspect Warning */
.aspect-warning {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 1.5rem;
    background: var(--warning-light);
    color: var(--warning);
    font-size: 0.875rem;
    border-bottom: 1px solid var(--border);
}

.aspect-warning a {
    color: var(--warning);
    font-weight: 600;
}

/* Source Preview */
.source-preview {
    padding: 1.5rem;
    text-align: center;
}

.preview-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}

.source-image-container {
    display: inline-block;
    padding: 12px;
    border-radius: var(--radius-md);
    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 0px;
    border: 1px solid var(--border);
}

.source-image-container img {
    display: block;
    max-width: 200px;
    max-height: 200px;
    border-radius: var(--radius-sm);
}

/* Size Selection */
.size-selection {
    padding: 1.5rem;
    border-top: 1px solid var(--border);
}

.size-selection h3,
.fit-mode-section h3,
.bg-color-section h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin: 0 0 1rem;
}

.size-selection h3 i,
.size-selection h3 svg,
.fit-mode-section h3 i,
.fit-mode-section h3 svg,
.bg-color-section h3 i,
.bg-color-section h3 svg {
    color: var(--primary);
}

.size-selection-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.size-selection-header h3 {
    margin: 0;
}

.preset-buttons {
    display: flex;
    gap: 0.5rem;
}

.preset-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.4rem 0.85rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    background: var(--bg-secondary);
    color: var(--text-muted);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.preset-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.preset-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.size-checkboxes {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.size-checkbox {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
}

.size-checkbox:hover {
    border-color: var(--primary);
}

.size-checkbox.checked {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary);
}

.size-checkbox input {
    display: none;
}

.size-checkbox .size-label {
    font-size: 0.85rem;
    font-weight: 600;
}

.size-checkbox .size-use {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.size-checkbox.checked .size-use {
    color: var(--primary);
    opacity: 0.8;
}

/* Fit Mode */
.fit-mode-section {
    padding: 1.5rem;
    border-top: 1px solid var(--border);
}

.fit-mode-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
}

.fit-mode-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
}

.fit-mode-option input {
    display: none;
}

.fit-mode-option:hover {
    border-color: var(--primary);
}

.fit-mode-option.active {
    background: var(--primary-light);
    border-color: var(--primary);
}

.fit-mode-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: all 0.2s ease;
}

.fit-mode-option.active .fit-mode-icon {
    background: var(--primary);
    color: white;
}

.fit-mode-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
}

.fit-mode-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.3;
}

/* Background Color */
.bg-color-section {
    padding: 1.5rem;
    border-top: 1px solid var(--border);
}

.bg-options {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.bg-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

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

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

.bg-option.active {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary);
}

.bg-swatch {
    width: 20px;
    height: 20px;
    border-radius: 4px;
    border: 1px solid var(--border);
    flex-shrink: 0;
}

.transparent-swatch {
    background-image:
        linear-gradient(45deg, #ccc 25%, transparent 25%),
        linear-gradient(-45deg, #ccc 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #ccc 75%),
        linear-gradient(-45deg, transparent 75%, #ccc 75%);
    background-size: 10px 10px;
    background-position: 0 0, 0 5px, 5px -5px, -5px 0px;
}

.bg-color-input {
    width: 24px;
    height: 24px;
    border: 1px solid var(--border);
    border-radius: 4px;
    cursor: pointer;
    padding: 0;
    background: none;
}

/* Generate Button */
.generate-section {
    padding: 1.5rem;
    border-top: 1px solid var(--border);
    text-align: center;
}

.generate-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.9rem 2.5rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-full);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-primary);
}

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

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

/* Results Section */
.results-section {
    padding: 1.5rem;
    border-top: 1px solid var(--border);
}

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

.results-header h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--success);
    margin: 0;
}

.download-all-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.25rem;
    background: var(--success);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.download-all-btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

/* Icons Grid */
.icons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.icon-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    text-align: center;
    transition: all 0.2s ease;
}

.icon-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.icon-preview {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    aspect-ratio: 1;
    max-width: 140px;
    margin: 0 auto 1rem;
    border-radius: var(--radius-sm);
    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: 12px 12px;
    background-position: 0 0, 0 6px, 6px -6px, -6px 0px;
    border: 1px solid var(--border);
    overflow: hidden;
}

.icon-preview img {
    display: block;
    image-rendering: pixelated;
}

.icon-size-label {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 0.25rem;
}

.icon-use-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.icon-download-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.4rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

.icon-download-btn:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* Manifest Section */
.manifest-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    margin-bottom: 1.25rem;
}

.manifest-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.manifest-header h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin: 0;
}

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

.copy-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.4rem 0.85rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.copy-btn.copied {
    background: var(--success);
    color: white;
    border-color: var(--success);
}

.manifest-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.manifest-tab {
    padding: 0.35rem 0.85rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg);
    color: var(--text-muted);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.manifest-tab:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.manifest-tab.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.manifest-code {
    background: #1e293b;
    color: #e2e8f0;
    padding: 1.25rem;
    border-radius: var(--radius-sm);
    font-family: 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
    font-size: 0.85rem;
    line-height: 1.7;
    overflow-x: auto;
    margin: 0;
    white-space: pre;
}

[data-theme="dark"] .manifest-code {
    background: #0f172a;
    border: 1px solid var(--border);
}

.manifest-hint {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin: 0.75rem 0 0;
}

/* Folder Structure */
.folder-structure {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
}

.folder-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

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

.folder-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin: 0;
}

.folder-tree {
    font-family: 'Fira Code', 'Cascadia Code', monospace;
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.8;
    padding-left: 0.5rem;
}

.folder-tree .folder {
    color: var(--warning);
}

.folder-tree .file {
    color: var(--text-muted);
}

.folder-tree .highlight {
    color: var(--primary);
    font-weight: 600;
}

/* Related Tools */
.related-tools {
    margin-bottom: 2rem;
}

.related-tools h2 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text);
    margin: 0 0 1rem;
}

.related-tools h2 i,
.related-tools h2 svg {
    color: var(--primary);
}

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

.related-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.related-link:hover {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-1px);
}

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

.info-card {
    padding: 2rem;
}

.info-card h2 {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
    margin: 0 0 1.25rem;
}

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

.steps-list {
    padding-left: 1.25rem;
    margin: 0;
    color: var(--text-secondary);
}

.steps-list li {
    margin-bottom: 0.75rem;
    line-height: 1.6;
}

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

.steps-list a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

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

/* Mode Explanations */
.mode-explanations {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.mode-explain {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.mode-tag {
    display: inline-flex;
    align-items: center;
    padding: 0.35rem 0.85rem;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
    white-space: nowrap;
    flex-shrink: 0;
    min-width: 70px;
    justify-content: center;
}

.mode-tag.size-16 {
    background: rgba(51, 153, 204, 0.12);
    color: var(--color-2);
}

.mode-tag.size-32 {
    background: rgba(51, 153, 102, 0.12);
    color: var(--color-3);
}

.mode-tag.size-48 {
    background: rgba(230, 78, 78, 0.12);
    color: var(--color-1);
}

.mode-tag.size-128 {
    background: rgba(139, 92, 246, 0.12);
    color: #8b5cf6;
}

.mode-tag.tip-design {
    background: rgba(51, 153, 204, 0.12);
    color: var(--color-2);
}

.mode-tag.tip-format {
    background: rgba(51, 153, 102, 0.12);
    color: var(--color-3);
}

.mode-tag.tip-test {
    background: rgba(230, 78, 78, 0.12);
    color: var(--color-1);
}

.mode-explain p {
    margin: 0;
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.95rem;
}

.mode-explain a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.mode-explain a:hover {
    text-decoration: underline;
}

/* FAQ */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.faq-item {
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: border-color 0.2s ease;
}

.faq-item:hover {
    border-color: var(--primary);
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    background: var(--bg-secondary);
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text);
    text-align: left;
    transition: all 0.2s ease;
}

.faq-question:hover {
    background: var(--primary-light);
    color: var(--primary);
}

.faq-question i, .faq-question svg {
    flex-shrink: 0;
    transition: transform 0.3s ease;
    color: var(--text-muted);
}

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

.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: 1.6;
    font-size: 0.95rem;
    border-top: 1px solid var(--border);
}

.faq-answer a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

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

/* Error Message */
.error-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 2rem;
    text-align: center;
    color: var(--danger);
}

.error-message .error-text {
    font-size: 0.95rem;
    font-weight: 500;
}

.error-message .error-contact {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.error-message .error-contact a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.error-message .error-contact a:hover {
    text-decoration: underline;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: 0.75rem 1.5rem;
    background: var(--text);
    color: var(--bg);
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 500;
    z-index: 10000;
    opacity: 0;
    transition: all 0.3s ease;
    pointer-events: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
    .tool-container {
        padding: 1rem;
    }
    
    .upload-section {
        padding: 1.5rem;
    }
    
    .upload-area {
        padding: 2.5rem 1rem;
    }
    
    .fit-mode-options {
        grid-template-columns: 1fr;
    }
    
    .icons-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .file-info-bar {
        gap: 0.5rem;
        padding: 0.75rem 1rem;
    }
    
    .size-selection-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .manifest-code {
        font-size: 0.75rem;
    }
    
    .mode-explain {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .info-card {
        padding: 1.25rem;
    }
    
    .results-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }
}

@media (max-width: 480px) {
    .icons-grid {
        grid-template-columns: 1fr 1fr;
        gap: 0.75rem;
    }
    
    .icon-card {
        padding: 0.75rem;
    }
    
    .bg-options {
        flex-direction: column;
    }
    
    .preset-buttons {
        flex-wrap: wrap;
    }
}