/* ============================================
   CSS Color Editor - Modern Stylesheet
   Dark mode support with light mode default
   ============================================ */

/* CSS Variables - Light Mode (Default) */
:root {
    --color-1: #e64e4e;
    --color-2: #3399cc;
    --color-3: #339966;
    
    --primary: #3399cc;
    --primary-dark: #2980b9;
    --primary-light: #5dade2;
    --secondary: #6c757d;
    --success: #339966;
    --success-dark: #27ae60;
    --danger: #e64e4e;
    --danger-dark: #c0392b;
    --warning: #f39c12;
    --info: #17a2b8;
    
    --css-theme: #3399cc;
    --css-theme-dark: #2980b9;
    --css-theme-light: #5dade2;
    
    --text-primary: #2c3e50;
    --text-secondary: #5a6c7d;
    --text-muted: #95a5a6;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #ecf0f1;
    --body-bg: #ecf7fb;
    --border-color: #e0e6ed;
    --border-light: #eef2f7;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    
    --editor-bg: #fafafa;
    --editor-border: #e0e6ed;
}

/* Dark Mode */
[data-theme="dark"] {
    --color-1: #f87171;
    --color-2: #60a5fa;
    --color-3: #4ade80;
    
    --primary: #60a5fa;
    --primary-dark: #3b82f6;
    --primary-light: #93c5fd;
    --secondary: #9ca3af;
    --success: #4ade80;
    --success-dark: #22c55e;
    --danger: #f87171;
    --danger-dark: #ef4444;
    --warning: #fbbf24;
    --info: #38bdf8;
    
    --css-theme: #60a5fa;
    --css-theme-dark: #3b82f6;
    --css-theme-light: #93c5fd;
    
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --bg-primary: #1e293b;
    --bg-secondary: #334155;
    --bg-tertiary: #475569;
    --body-bg: #0f172a;
    --border-color: rgba(255, 255, 255, 0.1);
    --border-light: rgba(255, 255, 255, 0.05);
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
    
    --editor-bg: #1e293b;
    --editor-border: #475569;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--body-bg);
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

a {
    color: var(--css-theme);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--css-theme-dark);
    text-decoration: underline;
}

/* Tool Container */
.tool-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px 40px;
}

/* Tool Header */
.tool-header {
    text-align: center;
    margin-bottom: 30px;
    padding: 30px 20px;
}

.tool-title-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 16px;
}

.tool-icon-wrapper {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
    background-color: var(--css-theme);
    box-shadow: 0 4px 15px rgba(51, 153, 204, 0.3);
}

[data-theme="dark"] .tool-icon-wrapper {
    box-shadow: 0 4px 15px rgba(96, 165, 250, 0.3);
}

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

.tool-title {
    font-size: 2.2rem;
    font-weight: 700;
    margin: 0;
    color: var(--css-theme);
}

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

/* Tool Main */
.tool-main {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: 30px;
    margin-bottom: 30px;
    transition: background-color var(--transition-normal);
}

/* Message Box */
.message-box {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    font-weight: 500;
}

.message-box i {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.message-box.success {
    background: rgba(51, 153, 102, 0.15);
    color: var(--success);
}

[data-theme="dark"] .message-box.success {
    background: rgba(74, 222, 128, 0.15);
}

.message-box.error {
    background: rgba(230, 78, 78, 0.15);
    color: var(--danger);
}

[data-theme="dark"] .message-box.error {
    background: rgba(248, 113, 113, 0.15);
}

/* Upload Section */
.upload-section {
    margin-bottom: 25px;
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px 30px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    background: var(--bg-secondary);
}

.upload-area:hover {
    border-color: var(--css-theme);
    background: var(--bg-tertiary);
    box-shadow: var(--shadow-md);
}

.upload-area.active {
    border-color: var(--css-theme);
    background: var(--bg-tertiary);
    border-style: solid;
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.upload-icon {
    color: var(--css-theme);
    opacity: 0.8;
}

.upload-icon i {
    width: 48px;
    height: 48px;
}

.upload-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

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

.upload-hint {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 8px;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
    text-decoration: none;
}

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

.btn-primary {
    background-color: var(--css-theme);
    color: white;
    box-shadow: 0 4px 15px rgba(51, 153, 204, 0.3);
}

[data-theme="dark"] .btn-primary {
    box-shadow: 0 4px 15px rgba(96, 165, 250, 0.3);
}

.btn-primary:hover {
    background-color: var(--css-theme-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(51, 153, 204, 0.4);
    text-decoration: none;
    color: white;
}

.btn-secondary {
    background-color: var(--secondary);
    color: white;
    box-shadow: 0 4px 15px rgba(108, 117, 125, 0.25);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(108, 117, 125, 0.35);
    text-decoration: none;
    color: white;
}

.btn-success {
    background-color: var(--success);
    color: white;
    box-shadow: 0 4px 15px rgba(51, 153, 102, 0.3);
}

.btn-success:hover {
    background-color: var(--success-dark);
    transform: translateY(-2px);
    text-decoration: none;
    color: white;
}

.btn-danger {
    background-color: var(--danger);
    color: white;
    box-shadow: 0 4px 15px rgba(230, 78, 78, 0.3);
}

.btn-danger:hover {
    background-color: var(--danger-dark);
    transform: translateY(-2px);
    text-decoration: none;
    color: white;
}

.btn-outline {
    background: transparent;
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
    box-shadow: none;
}

.btn-outline:hover {
    border-color: var(--css-theme);
    color: var(--css-theme);
    background: rgba(51, 153, 204, 0.05);
    text-decoration: none;
}

[data-theme="dark"] .btn-outline:hover {
    background: rgba(96, 165, 250, 0.1);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 13px;
}

.btn-sm i {
    width: 14px;
    height: 14px;
}

.btn-browse {
    margin-top: 8px;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
    margin-bottom: 25px;
}

/* Progress */
.progress-container {
    margin: 20px 0;
}

.progress-bar {
    height: 10px;
    background: var(--bg-tertiary);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 8px;
}

.progress {
    height: 100%;
    background-color: var(--css-theme);
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 10px;
}

#progressText {
    font-size: 14px;
    color: var(--text-muted);
    text-align: center;
}

/* Section Headers */
.section-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-light);
}

.section-header h2 {
    font-size: 1.3rem;
    font-weight: 600;
    margin: 0;
    color: var(--text-primary);
}

.section-header i {
    width: 24px;
    height: 24px;
    color: var(--css-theme);
}

.section-desc {
    color: var(--text-secondary);
    margin-bottom: 15px;
}

/* Results Section */
.results-section,
.editor-section,
.sample-section,
.checker-section {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 25px;
    margin-bottom: 25px;
    transition: background-color var(--transition-normal);
}

/* Tip Box */
.tip-box {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    background: rgba(243, 156, 18, 0.1);
    padding: 15px 20px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    color: #856404;
}

[data-theme="dark"] .tip-box {
    background: rgba(251, 191, 36, 0.15);
    color: #fbbf24;
}

.tip-box i {
    width: 18px;
    height: 18px;
    color: var(--warning);
    flex-shrink: 0;
    margin-top: 2px;
}

/* Stats Bar */
.stats-bar {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    margin-bottom: 20px;
    padding: 15px 20px;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.stats-bar .stat-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
}

.stats-bar .stat-item i {
    width: 16px;
    height: 16px;
    color: var(--css-theme);
}

/* Color Palette */
.color-palette {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    padding: 10px 0;
}

.color-circle {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: 3px solid var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
}

.color-circle:hover {
    transform: scale(1.15);
    box-shadow: var(--shadow-lg);
}

.color-circle.selected {
    border-color: var(--css-theme);
    box-shadow: 0 0 0 4px rgba(51, 153, 204, 0.3), var(--shadow-lg);
}

[data-theme="dark"] .color-circle.selected {
    box-shadow: 0 0 0 4px rgba(96, 165, 250, 0.3), var(--shadow-lg);
}

.color-info {
    position: absolute;
    bottom: -45px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 10px;
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    pointer-events: none;
    z-index: 100;
    text-align: center;
    box-shadow: var(--shadow-md);
}

.color-circle:hover .color-info {
    opacity: 1;
    visibility: visible;
    bottom: -50px;
}

/* CSS Editor */
.css-editor-container {
    position: relative;
    border: 2px solid var(--editor-border);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    overflow: hidden;
    transition: border-color var(--transition-normal), background-color var(--transition-normal);
}

.css-editor-container:focus-within {
    border-color: var(--css-theme);
    box-shadow: 0 0 0 3px rgba(51, 153, 204, 0.1);
}

[data-theme="dark"] .css-editor-container:focus-within {
    box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.1);
}

#css-editor {
    width: 100%;
    height: 400px;
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;
    font-size: 14px;
    border: none;
    padding: 20px;
    resize: vertical;
    outline: none;
    background: var(--editor-bg);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-normal);
}

#css-editor::placeholder {
    color: var(--text-muted);
}

/* Yellow highlight for text selection */
#css-editor::selection {
    background-color: #ffeb3b;
    color: #000000;
}

#css-editor::-moz-selection {
    background-color: #ffeb3b;
    color: #000000;
}

[data-theme="dark"] #css-editor::selection {
    background-color: #ffd600;
    color: #000000;
}

[data-theme="dark"] #css-editor::-moz-selection {
    background-color: #ffd600;
    color: #000000;
}

/* Editor Actions */
.editor-actions {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
    margin-top: 20px;
}

/* Highlight Info */
#highlight-info {
    margin-bottom: 20px;
}

.highlight-info-box {
    background: rgba(51, 153, 204, 0.1);
    border: 1px solid rgba(51, 153, 204, 0.3);
    border-radius: var(--radius-md);
    padding: 20px;
}

[data-theme="dark"] .highlight-info-box {
    background: rgba(96, 165, 250, 0.1);
    border-color: rgba(96, 165, 250, 0.3);
}

.highlight-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
}

.highlight-color-preview {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-sm);
    border: 3px solid var(--bg-primary);
    box-shadow: var(--shadow-md);
}

.highlight-details {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.highlight-details strong {
    font-size: 1.1rem;
    color: var(--text-primary);
}

.highlight-count {
    background: var(--success);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.highlight-variants {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
}

.variants-label {
    font-weight: 600;
    color: var(--text-secondary);
    margin-right: 5px;
}

.variant-link {
    background: var(--bg-primary);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-family: monospace;
    font-size: 13px;
    cursor: pointer;
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.variant-link:hover {
    background: var(--css-theme);
    color: white;
    border-color: var(--css-theme);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.variant-link.active {
    background: var(--success);
    color: white;
    border-color: var(--success);
}

.variant-count {
    background: var(--secondary);
    color: white;
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 10px;
    min-width: 18px;
    text-align: center;
}

/* Sample Section */
.sample-textarea {
    width: 100%;
    height: 250px;
    font-family: 'SF Mono', 'Monaco', monospace;
    font-size: 13px;
    padding: 15px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    resize: vertical;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    transition: border-color var(--transition-normal), background-color var(--transition-normal);
}

.sample-textarea:focus {
    outline: none;
    border-color: var(--css-theme);
}

/* Quick Color Checker */
.checker-section {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
}

.checker-input-row {
    display: flex;
    gap: 15px;
    align-items: flex-end;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.checker-input-group {
    flex: 1;
    min-width: 250px;
}

.checker-input-group label {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.checker-input-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: 'SF Mono', 'Monaco', monospace;
    font-size: 14px;
    transition: all var(--transition-fast);
    background: var(--bg-primary);
    color: var(--text-primary);
}

.checker-input-group input:focus {
    outline: none;
    border-color: var(--css-theme);
    box-shadow: 0 0 0 3px rgba(51, 153, 204, 0.1);
}

[data-theme="dark"] .checker-input-group input:focus {
    box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.1);
}

.color-result {
    display: none;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-top: 20px;
}

.color-display {
    display: flex;
    gap: 20px;
    align-items: flex-start;
    margin-bottom: 20px;
}

.color-preview {
    width: 100px;
    height: 100px;
    border-radius: var(--radius-md);
    border: 3px solid var(--bg-primary);
    box-shadow: var(--shadow-md);
    flex-shrink: 0;
}

.color-values {
    flex: 1;
}

.color-values h4 {
    margin: 0 0 15px 0;
    color: var(--text-primary);
    font-size: 1.1rem;
}

.color-format {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 15px;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
}

.format-label {
    font-weight: 600;
    color: var(--text-secondary);
    min-width: 50px;
}

.format-value {
    flex: 1;
    font-family: 'SF Mono', 'Monaco', monospace;
    font-size: 14px;
    color: var(--text-primary);
}

.copy-btn {
    background: var(--bg-tertiary);
    border: none;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--text-muted);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.copy-btn i {
    width: 14px;
    height: 14px;
}

.copy-btn:hover {
    background: var(--css-theme);
    color: white;
}

.css-usage {
    background: rgba(51, 153, 204, 0.08);
    border-radius: var(--radius-md);
    padding: 15px 20px;
}

[data-theme="dark"] .css-usage {
    background: rgba(96, 165, 250, 0.1);
}

.css-usage h5 {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 12px 0;
    color: var(--css-theme-dark);
    font-size: 14px;
}

[data-theme="dark"] .css-usage h5 {
    color: var(--css-theme);
}

.css-usage h5 i {
    width: 16px;
    height: 16px;
}

.css-usage-item {
    font-family: 'SF Mono', 'Monaco', monospace;
    font-size: 13px;
    background: var(--bg-primary);
    padding: 10px 15px;
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
    color: var(--text-primary);
}

.css-usage-item:last-child {
    margin-bottom: 0;
}

/* Related Tools */
.related-tools {
    display: flex;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    margin-top: 20px;
}

.related-label {
    font-weight: 600;
    color: var(--text-secondary);
}

.related-links {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.related-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: var(--bg-primary);
    border-radius: 50px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition-fast);
    border: 1px solid var(--border-color);
}

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

.related-link:hover {
    background: var(--css-theme);
    color: white;
    border-color: var(--css-theme);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
    text-decoration: none;
}

/* Info Sections */
.info-sections {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.info-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: 30px;
    box-shadow: var(--shadow-md);
    transition: background-color var(--transition-normal);
}

.info-card h2 {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 20px 0;
}

.info-card h2 i {
    width: 24px;
    height: 24px;
    color: var(--css-theme);
}

.info-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 15px;
}

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

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

.steps-list li {
    position: relative;
    padding-left: 60px;
    padding-bottom: 25px;
    counter-increment: step-counter;
    color: var(--text-secondary);
    line-height: 1.6;
}

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

.steps-list li::before {
    content: counter(step-counter);
    position: absolute;
    left: 0;
    top: 0;
    width: 40px;
    height: 40px;
    background-color: var(--css-theme);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 16px;
    box-shadow: 0 4px 12px rgba(51, 153, 204, 0.3);
}

[data-theme="dark"] .steps-list li::before {
    box-shadow: 0 4px 12px rgba(96, 165, 250, 0.3);
}

.steps-list li::after {
    content: '';
    position: absolute;
    left: 19px;
    top: 45px;
    width: 2px;
    height: calc(100% - 45px);
    background-color: var(--css-theme);
    opacity: 0.3;
}

.steps-list li:last-child::after {
    display: none;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.feature-item {
    display: flex;
    gap: 15px;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.feature-item:hover {
    background: var(--bg-primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.feature-icon {
    width: 50px;
    height: 50px;
    background-color: var(--css-theme);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
}

.feature-icon i {
    width: 24px;
    height: 24px;
}

.feature-content h4 {
    margin: 0 0 8px 0;
    font-size: 1rem;
    color: var(--text-primary);
}

.feature-content p {
    margin: 0;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* FAQ */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

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

.faq-item:hover {
    border-color: var(--css-theme-light);
}

.faq-item.open {
    border-color: var(--css-theme);
    box-shadow: var(--shadow-md);
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 20px;
    background: var(--bg-secondary);
    border: none;
    cursor: pointer;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    text-align: left;
    transition: all var(--transition-fast);
}

.faq-question i {
    width: 20px;
    height: 20px;
}

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

.faq-item.open .faq-question {
    background: rgba(51, 153, 204, 0.1);
    color: var(--css-theme-dark);
}

[data-theme="dark"] .faq-item.open .faq-question {
    background: rgba(96, 165, 250, 0.1);
    color: var(--css-theme);
}

.faq-question i {
    color: var(--text-muted);
    transition: transform var(--transition-normal);
    flex-shrink: 0;
}

.faq-item.open .faq-question i {
    transform: rotate(180deg);
    color: var(--css-theme);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
}

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

.faq-answer p {
    padding: 20px;
    margin: 0;
    color: var(--text-secondary);
    line-height: 1.7;
    background: var(--bg-primary);
}

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

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

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: 14px 24px;
    border-radius: 50px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: var(--shadow-lg);
    z-index: 10000;
    opacity: 0;
    transition: all var(--transition-normal);
}

.toast i {
    width: 16px;
    height: 16px;
}

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

.toast.error {
    background: var(--danger);
    color: white;
}

/* Responsive */
@media (max-width: 768px) {
    .tool-container {
        padding: 0 15px 30px;
    }
    
    .tool-title-row {
        flex-direction: column;
        gap: 12px;
    }
    
    .tool-title {
        font-size: 1.8rem;
        text-align: center;
    }
    
    .tool-main {
        padding: 20px;
        border-radius: var(--radius-lg);
    }
    
    .upload-area {
        padding: 30px 20px;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .action-buttons .btn {
        width: 100%;
    }
    
    .color-palette {
        gap: 10px;
        justify-content: center;
    }
    
    .color-circle {
        width: 50px;
        height: 50px;
    }
    
    #css-editor {
        height: 300px;
        font-size: 13px;
    }
    
    .editor-actions {
        flex-direction: column;
    }
    
    .editor-actions .btn {
        width: 100%;
    }
    
    .highlight-header {
        flex-direction: column;
        text-align: center;
    }
    
    .highlight-variants {
        justify-content: center;
    }
    
    .checker-input-row {
        flex-direction: column;
    }
    
    .checker-input-group {
        min-width: auto;
        width: 100%;
    }
    
    .checker-input-row .btn {
        width: 100%;
    }
    
    .color-display {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .color-format {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .related-tools {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .related-links {
        width: 100%;
    }
    
    .related-link {
        flex: 1;
        justify-content: center;
        min-width: calc(50% - 5px);
    }
    
    .info-card {
        padding: 20px;
        border-radius: var(--radius-lg);
    }
    
    .steps-list li {
        padding-left: 50px;
    }
    
    .steps-list li::before {
        width: 35px;
        height: 35px;
        font-size: 14px;
    }
    
    .steps-list li::after {
        left: 16px;
        top: 40px;
        height: calc(100% - 40px);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-item {
        flex-direction: column;
        text-align: center;
    }
    
    .feature-icon {
        margin: 0 auto;
    }
}

@media (max-width: 480px) {
    .tool-title {
        font-size: 1.5rem;
    }
    
    .tool-description {
        font-size: 1rem;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 14px;
    }
    
    .info-card h2 {
        font-size: 1.2rem;
        flex-wrap: wrap;
    }
    
    .color-reference-table th,
    .color-reference-table td {
        padding: 10px;
        font-size: 13px;
    }
    
    .variant-tag {
        font-size: 11px;
        padding: 3px 8px;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}