/* ============================================
   Color Contrast Checker - Modern Stylesheet
   Dark mode support with light mode default
   Matching SURITD TOOLS design system
   ============================================ */

/* CSS Variables - Light Mode (Default) */
:root {
    --cc-primary: #3399cc;
    --cc-primary-light: #dbeafe;
    --cc-primary-dark: #2980b9;
    --cc-accent: #60a5fa;
    --cc-success: #10B981;
    --cc-success-light: #D1FAE5;
    --cc-warning: #F59E0B;
    --cc-warning-light: #FEF3C7;
    --cc-danger: #EF4444;
    --cc-danger-light: #FEE2E2;
    --cc-purple: #8B5CF6;
    --cc-purple-light: #EDE9FE;
    
    --cc-bg: #f8fafc;
    --cc-bg-alt: #f1f5f9;
    --cc-bg-elevated: #ffffff;
    --cc-text: #1e293b;
    --cc-text-secondary: #64748b;
    --cc-text-muted: #94a3b8;
    --cc-border: #e2e8f0;
    
    --cc-shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --cc-shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --cc-shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    --cc-shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1);
    
    --cc-radius-sm: 6px;
    --cc-radius-md: 12px;
    --cc-radius-lg: 16px;
    --cc-radius-xl: 24px;
    --cc-radius-full: 9999px;
    
    /* Grade Colors */
    --cc-grade-aplus: #10B981;
    --cc-grade-a: #22C55E;
    --cc-grade-b: #EAB308;
    --cc-grade-c: #F97316;
    --cc-grade-f: #EF4444;
    
    --cc-transition: 0.25s;
}

/* CSS Variables - Dark Mode */
[data-theme="dark"] {
    --cc-primary: #60a5fa;
    --cc-primary-light: rgba(96, 165, 250, 0.15);
    --cc-primary-dark: #3b82f6;
    --cc-accent: #93c5fd;
    --cc-success: #4ade80;
    --cc-success-light: rgba(74, 222, 128, 0.15);
    --cc-warning: #fbbf24;
    --cc-warning-light: rgba(251, 191, 36, 0.15);
    --cc-danger: #f87171;
    --cc-danger-light: rgba(248, 113, 113, 0.15);
    --cc-purple: #a78bfa;
    --cc-purple-light: rgba(167, 139, 250, 0.15);
    
    --cc-bg: #0f172a;
    --cc-bg-alt: #1e293b;
    --cc-bg-elevated: #1e293b;
    --cc-text: #f1f5f9;
    --cc-text-secondary: #cbd5e1;
    --cc-text-muted: #94a3b8;
    --cc-border: rgba(255,255,255,0.1);
    
    --cc-shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --cc-shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4);
    --cc-shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.4);
    --cc-shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.5);
    
    --cc-grade-aplus: #4ade80;
    --cc-grade-a: #4ade80;
    --cc-grade-b: #fbbf24;
    --cc-grade-c: #fb923c;
    --cc-grade-f: #f87171;
}

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

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

/* 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-inline {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    color: var(--cc-primary);
}

.tool-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin: 0;
    color: var(--cc-primary);
    letter-spacing: -0.02em;
    transition: color var(--cc-transition);
}

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

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

/* Preview Section */
.preview-section {
    padding: 0;
}

.contrast-preview {
    min-height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #FFFFFF;
    color: #000000;
    transition: background-color 0.3s ease, color 0.3s ease;
    border-bottom: 1px solid var(--cc-border);
}

.preview-content {
    text-align: center;
    padding: 2rem;
    max-width: 600px;
}

.sample-large {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.3;
}

.sample-small {
    display: block;
    font-size: 1rem;
    line-height: 1.6;
    opacity: 0.9;
}

/* Color Input Section */
.color-input-section {
    padding: 1.5rem 2rem;
    background: var(--cc-bg-alt);
    border-bottom: 1px solid var(--cc-border);
    transition: background-color var(--cc-transition), border-color var(--cc-transition);
}

.color-inputs-row {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.color-input-group {
    flex: 1;
    min-width: 200px;
    max-width: 280px;
}

.color-input-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--cc-text);
    margin-bottom: 0.5rem;
    transition: color var(--cc-transition);
}

.input-icon {
    width: 16px;
    height: 16px;
    color: var(--cc-primary);
}

.input-with-preview {
    display: flex;
    align-items: center;
    background: var(--cc-bg-elevated);
    border: 2px solid var(--cc-border);
    border-radius: var(--cc-radius-md);
    overflow: hidden;
    transition: all 0.2s ease;
}

.input-with-preview:focus-within {
    border-color: var(--cc-primary);
    box-shadow: 0 0 0 3px rgba(51, 153, 204, 0.15);
}

[data-theme="dark"] .input-with-preview:focus-within {
    box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.15);
}

.color-swatch {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    border-right: 1px solid var(--cc-border);
    background-color: #000000;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.color-swatch:hover {
    transform: scale(1.05);
}

#foreground-swatch {
    background-color: #000000;
}

#background-swatch {
    background-color: #FFFFFF;
}

.color-input-group input {
    flex: 1;
    border: none;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    font-family: 'SF Mono', 'Fira Code', monospace;
    text-transform: uppercase;
    background: transparent;
    color: var(--cc-text);
    outline: none;
    transition: color var(--cc-transition);
}

.swap-btn {
    width: 48px;
    height: 48px;
    border-radius: var(--cc-radius-md);
    border: 2px solid var(--cc-border);
    background: var(--cc-bg-elevated);
    color: var(--cc-text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.swap-btn:hover {
    background: var(--cc-primary);
    border-color: var(--cc-primary);
    color: white;
    transform: rotate(180deg);
}

.swap-btn svg {
    width: 20px;
    height: 20px;
}

/* Results Section */
.results-section {
    padding: 2rem;
    border-bottom: 1px solid var(--cc-border);
    background: var(--cc-bg-elevated);
    transition: background-color var(--cc-transition), border-color var(--cc-transition);
}

.contrast-ratio-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.ratio-circle {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    background: var(--cc-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: 0 10px 30px rgba(51, 153, 204, 0.3);
    position: relative;
    transition: background-color var(--cc-transition), box-shadow var(--cc-transition);
}

[data-theme="dark"] .ratio-circle {
    box-shadow: 0 10px 30px rgba(96, 165, 250, 0.25);
}

.ratio-circle::before {
    content: '';
    position: absolute;
    inset: 4px;
    border-radius: 50%;
    border: 2px solid rgba(255,255,255,0.3);
}

.ratio-value {
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1;
}

.ratio-label {
    font-size: 0.75rem;
    opacity: 0.9;
    margin-top: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.grade-display {
    text-align: center;
}

.grade-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    border-radius: var(--cc-radius-lg);
    font-size: 2rem;
    font-weight: 800;
    color: white;
    margin-bottom: 0.75rem;
    box-shadow: var(--cc-shadow-md);
}

.grade-aplus { background: var(--cc-grade-aplus); }
.grade-a { background: var(--cc-grade-a); }
.grade-b { background: var(--cc-grade-b); }
.grade-c { background: var(--cc-grade-c); }
.grade-f { background: var(--cc-grade-f); }

.grade-text {
    font-size: 0.9rem;
    color: var(--cc-text-secondary);
    max-width: 200px;
    transition: color var(--cc-transition);
}

/* WCAG Standards Grid */
.wcag-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.wcag-column h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--cc-text);
    margin: 0 0 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--cc-border);
    transition: color var(--cc-transition), border-color var(--cc-transition);
}

.wcag-icon {
    width: 16px;
    height: 16px;
    color: var(--cc-primary);
}

.standard-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 0.75rem;
    border-radius: var(--cc-radius-sm);
    margin-bottom: 0.5rem;
    transition: all 0.2s ease;
}

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

.standard-item.pass {
    background: var(--cc-success-light);
}

.standard-item.fail {
    background: var(--cc-danger-light);
}

.standard-icon {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.standard-item.pass .standard-icon {
    background: var(--cc-success);
    color: white;
}

.standard-item.fail .standard-icon {
    background: var(--cc-danger);
    color: white;
}

.standard-icon svg {
    width: 12px;
    height: 12px;
}

.standard-label {
    flex: 1;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--cc-text);
    transition: color var(--cc-transition);
}

.standard-status {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.standard-item.pass .standard-status {
    color: var(--cc-success);
}

.standard-item.fail .standard-status {
    color: var(--cc-danger);
}

/* Color Pickers Section */
.color-pickers-section {
    padding: 2rem;
    border-bottom: 1px solid var(--cc-border);
    background: var(--cc-bg-alt);
    transition: background-color var(--cc-transition), border-color var(--cc-transition);
}

.color-pickers-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.color-picker-card {
    background: var(--cc-bg-elevated);
    border-radius: var(--cc-radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--cc-border);
    box-shadow: var(--cc-shadow-sm);
    transition: background-color var(--cc-transition), border-color var(--cc-transition), box-shadow var(--cc-transition);
}

.picker-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--cc-border);
    transition: border-color var(--cc-transition);
}

.picker-icon {
    width: 20px;
    height: 20px;
    color: var(--cc-primary);
}

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

.color-presets {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.color-preset {
    aspect-ratio: 1;
    border-radius: var(--cc-radius-sm);
    cursor: pointer;
    border: 2px solid var(--cc-border);
    transition: all 0.2s ease;
    position: relative;
}

.color-preset:hover {
    transform: scale(1.1);
    z-index: 1;
    box-shadow: var(--cc-shadow-md);
}

.color-preset.active {
    border-color: var(--cc-primary);
    box-shadow: 0 0 0 2px var(--cc-primary-light);
}

.picker-controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.saturation-value-picker {
    width: 100%;
    height: 150px;
    border-radius: var(--cc-radius-md);
    position: relative;
    cursor: crosshair;
    background: linear-gradient(to right, #fff, hsl(0, 100%, 50%));
    overflow: hidden;
}

.saturation-value-picker::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, #000, transparent);
    pointer-events: none;
}

.sv-picker-cursor {
    position: absolute;
    width: 16px;
    height: 16px;
    border: 2px solid white;
    border-radius: 50%;
    box-shadow: 0 0 0 1px rgba(0,0,0,0.3), inset 0 0 0 1px rgba(0,0,0,0.3);
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: 10;
    top: 0;
    left: 100%;
}

.hue-slider-container {
    position: relative;
    height: 20px;
}

.hue-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 100%;
    border-radius: var(--cc-radius-full);
    background: linear-gradient(to right, 
        hsl(0, 100%, 50%), 
        hsl(60, 100%, 50%), 
        hsl(120, 100%, 50%), 
        hsl(180, 100%, 50%), 
        hsl(240, 100%, 50%), 
        hsl(300, 100%, 50%), 
        hsl(360, 100%, 50%)
    );
    outline: none;
    cursor: pointer;
}

.hue-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: white;
    border: 2px solid var(--cc-text);
    cursor: pointer;
    box-shadow: var(--cc-shadow-md);
}

.hue-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: white;
    border: 2px solid var(--cc-text);
    cursor: pointer;
    box-shadow: var(--cc-shadow-md);
}

.hue-gradient {
    display: none;
}

/* Custom Text Section */
.custom-text-section {
    padding: 2rem;
    border-bottom: 1px solid var(--cc-border);
    background: var(--cc-bg-elevated);
    transition: background-color var(--cc-transition), border-color var(--cc-transition);
}

.section-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.section-icon {
    width: 20px;
    height: 20px;
    color: var(--cc-primary);
}

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

#custom-text {
    width: 100%;
    min-height: 100px;
    padding: 1rem;
    border: 2px solid var(--cc-border);
    border-radius: var(--cc-radius-md);
    font-size: 1rem;
    font-family: inherit;
    resize: vertical;
    margin-bottom: 1rem;
    transition: all 0.2s ease;
    background: var(--cc-bg-elevated);
    color: var(--cc-text);
}

#custom-text:focus {
    outline: none;
    border-color: var(--cc-primary);
    box-shadow: 0 0 0 3px rgba(51, 153, 204, 0.15);
}

[data-theme="dark"] #custom-text:focus {
    box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.15);
}

/* Export Section */
.export-section {
    padding: 2rem;
    background: var(--cc-bg-elevated);
    transition: background-color var(--cc-transition);
}

.export-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    border-radius: var(--cc-radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    text-decoration: none;
}

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

.btn-primary {
    background: var(--cc-primary);
    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, 0.25);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(51, 153, 204, 0.4);
}

[data-theme="dark"] .btn-primary:hover {
    box-shadow: 0 6px 20px rgba(96, 165, 250, 0.35);
}

.btn-secondary {
    background: var(--cc-bg-elevated);
    color: var(--cc-text);
    border: 2px solid var(--cc-border);
    transition: all 0.2s ease;
}

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

/* Info Sections */
.info-sections {
    display: grid;
    gap: 2rem;
    margin-top: 3rem;
}

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

.info-card h2 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.35rem;
    color: var(--cc-text);
    margin: 0 0 1.5rem;
    transition: color var(--cc-transition);
}

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

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

.steps-list li {
    position: relative;
    padding-left: 3.5rem;
    padding-bottom: 1.25rem;
    margin-left: 1rem;
    counter-increment: step;
    color: var(--cc-text-secondary);
    transition: color var(--cc-transition);
}

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

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

.steps-list li::before {
    content: counter(step);
    position: absolute;
    left: -1rem;
    top: 0;
    width: 2rem;
    height: 2rem;
    background: var(--cc-primary);
    color: white;
    border-radius: var(--cc-radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.875rem;
    transition: background-color var(--cc-transition);
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.feature-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.feature-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    border-radius: var(--cc-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

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

.feature-icon.blue { background: var(--cc-primary); }
.feature-icon.green { background: var(--cc-success); }
.feature-icon.purple { background: var(--cc-purple); }
.feature-icon.orange { background: var(--cc-warning); }

.feature-content h3 {
    margin: 0 0 0.35rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--cc-text);
    transition: color var(--cc-transition);
}

.feature-content p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--cc-text-secondary);
    line-height: 1.5;
    transition: color var(--cc-transition);
}

/* Guidelines */
.guidelines-content p {
    color: var(--cc-text-secondary);
    margin-bottom: 1.5rem;
    transition: color var(--cc-transition);
}

.guidelines-grid {
    display: grid;
    gap: 1rem;
}

.guideline-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    padding: 1rem;
    background: var(--cc-bg);
    border-radius: var(--cc-radius-md);
    transition: background-color var(--cc-transition);
}

.guideline-badge {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    border-radius: var(--cc-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.875rem;
    color: white;
}

.guideline-badge.level-aa { background: var(--cc-success); }
.guideline-badge.level-aaa { background: var(--cc-primary); }
.guideline-badge.level-ui { background: var(--cc-purple); }

.guideline-info strong {
    display: block;
    margin-bottom: 0.25rem;
    color: var(--cc-text);
    transition: color var(--cc-transition);
}

.guideline-info p {
    margin: 0;
    font-size: 0.875rem;
    color: var(--cc-text-secondary);
    transition: color var(--cc-transition);
}

/* FAQ */
.faq-list {
    display: grid;
    gap: 0.75rem;
}

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

.faq-question {
    width: 100%;
    padding: 1rem 1.25rem;
    background: var(--cc-bg);
    border: none;
    text-align: left;
    font-size: 1rem;
    font-weight: 600;
    color: var(--cc-text);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.2s ease;
}

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

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

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

.faq-answer {
    display: none;
    padding: 0 1.25rem 1rem;
    background: var(--cc-bg-elevated);
    transition: background-color var(--cc-transition);
}

.faq-item.open .faq-answer {
    display: block;
}

.faq-answer p {
    margin: 0;
    color: var(--cc-text-secondary);
    line-height: 1.7;
    transition: color var(--cc-transition);
}

/* Notification Messages */
.notification-message {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--cc-success);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: var(--cc-radius-md);
    box-shadow: var(--cc-shadow-lg);
    z-index: 1000;
    animation: slideIn 0.3s ease;
}

.error-message {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--cc-danger);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: var(--cc-radius-md);
    box-shadow: var(--cc-shadow-lg);
    z-index: 1000;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Internal Links */
.content-link {
    color: var(--cc-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.content-link:hover {
    color: var(--cc-primary-dark);
    text-decoration: underline;
}

[data-theme="dark"] .content-link:hover {
    color: var(--cc-accent);
}

/* Responsive */
@media (max-width: 900px) {
    .color-pickers-container {
        grid-template-columns: 1fr;
    }
    
    .wcag-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .tool-container {
        padding: 1rem;
    }
    
    .color-inputs-row {
        flex-direction: column;
        align-items: stretch;
    }
    
    .color-input-group {
        max-width: none;
    }
    
    .swap-btn {
        align-self: center;
        transform: rotate(90deg);
    }
    
    .swap-btn:hover {
        transform: rotate(270deg);
    }
    
    .contrast-ratio-display {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .export-buttons {
        grid-template-columns: 1fr;
    }
    
    .results-section,
    .color-pickers-section,
    .custom-text-section,
    .export-section {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .tool-title {
        font-size: 1.75rem;
    }
    
    .tool-title-row {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .color-presets {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .feature-item {
        flex-direction: column;
    }
    
    .sample-large {
        font-size: 1.5rem;
    }
    
    .sample-small {
        font-size: 0.875rem;
    }
    
    .ratio-circle {
        width: 120px;
        height: 120px;
    }
    
    .ratio-value {
        font-size: 1.5rem;
    }
}

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

/* Print Styles */
@media print {
    .tool-main {
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    .color-pickers-section,
    .export-section,
    .custom-text-section,
    .info-sections {
        display: none;
    }
}

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