* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2596be;
    --primary-dark: #1e7a9a;
    --bg-color: #f5f7fa;
    --card-bg: #ffffff;
    --text-primary: #2d3748;
    --text-secondary: #718096;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    padding-top: 80px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--card-bg);
    box-shadow: var(--shadow);
    z-index: 1000;
    height: 70px;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    text-decoration: none;
    color: inherit;
    display: block;
}

.logo h1 {
    font-size: 1.5rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
    transition: opacity 0.3s ease;
}

.logo a:hover h1 {
    opacity: 0.8;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 1.5rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    background: rgba(37, 150, 190, 0.1);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

/* Tool Sections */
.tool-section {
    display: none !important;
}

.tool-section.active {
    display: block !important;
}

.tool-section header {
    text-align: center;
    margin-bottom: 3rem;
}

.tool-section header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.image-section h3, .color-section h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.upload-section {
    margin-bottom: 2rem;
}

.upload-area {
    background: var(--card-bg);
    border: 3px dashed var(--border-color);
    border-radius: 16px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: #f8f9ff;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.upload-area.dragover {
    border-color: var(--primary-color);
    background: #f0f4ff;
    transform: scale(1.02);
}

.upload-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1.5rem;
    color: var(--primary-color);
    stroke-width: 2;
}

.upload-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.upload-content p {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.upload-hint {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-style: italic;
}

.url-input {
    width: 100%;
    max-width: 600px;
    margin-top: 1.5rem;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.url-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 150, 190, 0.1);
}

.content-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-top: 2rem;
}

.image-section, .color-section {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.image-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.image-header h3 {
    margin: 0;
}

.replace-image-controls {
    display: flex;
    gap: 0.5rem;
}

.replace-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

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

.replace-btn svg {
    width: 16px;
    height: 16px;
}

.url-input-section {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.url-input-replace {
    flex: 1;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    transition: border-color 0.3s ease;
}

.url-input-replace:focus {
    outline: none;
    border-color: var(--primary-color);
}

.load-url-btn {
    padding: 0.75rem 1.5rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.3s ease;
    white-space: nowrap;
}

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


.image-container {
    position: relative;
    width: 100%;
    border-radius: 12px;
    overflow: hidden;
    background: #f0f0f0;
    cursor: crosshair;
    box-shadow: var(--shadow);
}

#imageCanvas {
    display: block;
    width: 100%;
    height: auto;
    max-height: 500px;
    object-fit: contain;
}

.picker-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.picker-cursor {
    position: absolute;
    width: 20px;
    height: 20px;
    border: 2px solid #fff;
    border-radius: 50%;
    box-shadow: 0 0 0 2px var(--primary-color), 0 0 10px rgba(0, 0, 0, 0.3);
    transform: translate(-50%, -50%);
    pointer-events: none;
    display: none;
}

.picker-cursor.active {
    display: block;
}

.instruction {
    margin-top: 1rem;
    text-align: center;
    color: var(--text-secondary);
    font-style: italic;
}

.color-display {
    margin-bottom: 2rem;
}

.color-preview {
    width: 100%;
    height: 200px;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
    border: 2px solid var(--border-color);
    background: #000;
    transition: all 0.3s ease;
}

.color-codes {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.color-code-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-color);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.color-code-item:hover {
    background: #e8f0f5;
    transform: translateX(4px);
}

.color-code-item label {
    font-weight: 600;
    min-width: 50px;
    color: var(--text-primary);
}

.code-value {
    flex: 1;
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    color: var(--text-primary);
    font-weight: 500;
}

.copy-btn {
    padding: 0.5rem 1rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

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

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

.palette-section {
    margin-top: 2rem;
}

.palette-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 1rem;
}

.palette-color {
    aspect-ratio: 1;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
    border: 2px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.palette-color:hover {
    transform: scale(1.1) translateY(-4px);
    box-shadow: var(--shadow-lg);
    z-index: 10;
}

.palette-color::after {
    content: attr(data-hex);
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 0.25rem;
    font-size: 0.75rem;
    text-align: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.palette-color:hover::after {
    opacity: 1;
}

footer {
    background: var(--text-primary);
    color: #fff;
    padding: 3rem 2rem 2rem;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    color: #fff;
    margin-bottom: 1rem;
    font-size: 1.1rem;
    font-weight: 600;
}

.footer-links {
    list-style: none;
    padding: 0;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: 0.95rem;
}

.footer-links a:hover {
    color: #fff;
    text-decoration: underline;
}

.footer-note {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.footer-copyright {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.85rem;
    margin: 0;
}

/* SEO Content */
.seo-content {
    background: var(--bg-color);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
    line-height: 1.8;
}

.seo-content h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.seo-content p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
    text-align: justify;
}

.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--text-primary);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
    pointer-events: none;
    z-index: 1000;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

/* Color Code Tool */
.color-code-tool {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.color-input-section {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.color-picker-wrapper {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.color-picker-wrapper input[type="color"] {
    width: 100px;
    height: 100px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

.hex-input-wrapper {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1;
}

.hex-input-wrapper input {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: 'Courier New', monospace;
}

.color-display-card {
    background: var(--bg-color);
    border-radius: 12px;
    padding: 2rem;
}

.color-preview-large {
    width: 100%;
    height: 300px;
    border-radius: 12px;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    border: 2px solid var(--border-color);
}

.color-codes-full {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

/* Contrast Checker */
.contrast-checker {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.contrast-colors {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

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

.color-input-group label {
    font-weight: 600;
}

.color-input-group input[type="color"] {
    width: 80px;
    height: 80px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

.color-input-group input[type="text"] {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-family: 'Courier New', monospace;
}

.contrast-preview {
    background: var(--bg-color);
    border-radius: 12px;
    padding: 3rem;
    margin-bottom: 2rem;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-text {
    font-size: 2rem;
    font-weight: 600;
}

.contrast-results {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.contrast-result-item {
    background: var(--bg-color);
    padding: 1.5rem;
    border-radius: 8px;
}

.contrast-result-item h4 {
    margin-bottom: 0.5rem;
}

.contrast-ratio {
    font-size: 2rem;
    font-weight: 700;
    margin: 0.5rem 0;
}

.contrast-status {
    padding: 0.5rem 1rem;
    border-radius: 6px;
    display: inline-block;
    font-weight: 600;
}

.contrast-status.pass {
    background: #10b981;
    color: white;
}

.contrast-status.fail {
    background: #ef4444;
    color: white;
}

.contrast-status.warn {
    background: #f59e0b;
    color: white;
}

/* Blindness Simulator */
.blindness-simulator {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.blindness-controls {
    margin-bottom: 2rem;
}

.blindness-controls label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.blindness-controls select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
}

.upload-area-small {
    background: var(--bg-color);
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-area-small:hover {
    border-color: var(--primary-color);
    background: #f8f9ff;
}

.blindness-canvas-wrapper {
    margin-top: 2rem;
}

.canvas-comparison {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.canvas-item {
    background: var(--bg-color);
    padding: 1rem;
    border-radius: 12px;
}

.canvas-item h4 {
    margin-bottom: 1rem;
    text-align: center;
}

.canvas-item canvas {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

/* Gradient Maker */
.gradient-maker {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.gradient-controls {
    margin-bottom: 2rem;
}

.gradient-colors {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.gradient-color-stop {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.gradient-color-stop label {
    font-weight: 600;
}

.gradient-color-stop input[type="color"] {
    width: 100px;
    height: 100px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

.gradient-color-stop input[type="text"] {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-family: 'Courier New', monospace;
}

.gradient-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.option-group label {
    font-weight: 600;
}

.option-group select,
.option-group input[type="range"] {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
}

.option-group input[type="range"] {
    padding: 0;
}

.gradient-preview {
    width: 100%;
    height: 300px;
    border-radius: 12px;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    border: 2px solid var(--border-color);
}

.gradient-code {
    background: var(--bg-color);
    padding: 1.5rem;
    border-radius: 12px;
}

.gradient-code label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.code-block {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.code-block code {
    flex: 1;
    padding: 1rem;
    background: #1e293b;
    color: #e2e8f0;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    display: block;
    overflow-x: auto;
}

/* Color Mixer */
.color-mixer {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.mixer-controls {
    margin-bottom: 2rem;
}

.mixer-color-input {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.mixer-color-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.mixer-color-group label {
    font-weight: 600;
}

.mixer-color-group input[type="color"] {
    width: 100px;
    height: 100px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

.mixer-color-group input[type="text"] {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-family: 'Courier New', monospace;
}

.mixer-ratio {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.mixer-ratio label {
    font-weight: 600;
}

.mixer-ratio input[type="range"] {
    width: 100%;
}

.ratio-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.mixer-result {
    background: var(--bg-color);
    border-radius: 12px;
    padding: 2rem;
}

.mixer-result h3 {
    margin-bottom: 1rem;
}

.mixed-color-preview {
    width: 100%;
    height: 200px;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
    border: 2px solid var(--border-color);
}

.mixed-color-codes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

/* Color Converter */
.color-converter {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.converter-input {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    align-items: flex-end;
}

.converter-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1;
    min-width: 200px;
}

.converter-group label {
    font-weight: 600;
}

.converter-group select,
.converter-group input {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
}

.convert-btn {
    padding: 0.75rem 2rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    height: fit-content;
}

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

.converter-results {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

.converter-result-item {
    background: var(--bg-color);
    padding: 1.5rem;
    border-radius: 8px;
}

.converter-result-item h4 {
    margin-bottom: 0.5rem;
}

.converter-result-item .code-value {
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    margin: 0.5rem 0;
}

/* Color Schemes */
.color-schemes {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.scheme-input {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.scheme-color-input {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.scheme-color-input input[type="color"] {
    width: 80px;
    height: 80px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

.scheme-color-input input[type="text"] {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    flex: 1;
}

.scheme-input select {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
}

.scheme-palette {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1rem;
}

.scheme-color-item {
    background: var(--bg-color);
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.scheme-color-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.scheme-color-swatch {
    width: 100%;
    height: 120px;
}

.scheme-color-info {
    padding: 1rem;
}

.scheme-color-hex {
    font-family: 'Courier New', monospace;
    font-weight: 600;
}

/* Color Shades */
.color-shades {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.shades-input {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.shades-color-input {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.shades-color-input input[type="color"] {
    width: 80px;
    height: 80px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

.shades-color-input input[type="text"] {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    flex: 1;
}

.shades-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 1rem;
}

.shade-item {
    background: var(--bg-color);
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.shade-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.shade-swatch {
    width: 100%;
    height: 100px;
}

.shade-info {
    padding: 0.75rem;
    text-align: center;
}

.shade-hex {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    font-weight: 600;
}

/* Color Wheel */
.color-wheel-tool {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.wheel-main-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.wheel-container {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

#colorWheelCanvas {
    border-radius: 50%;
    cursor: crosshair;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 500px;
    height: auto;
    display: block;
    aspect-ratio: 1;
}

.wheel-picker {
    position: absolute;
    width: 20px;
    height: 20px;
    border: 3px solid white;
    border-radius: 50%;
    box-shadow: 0 0 0 2px var(--primary-color), 0 0 10px rgba(0, 0, 0, 0.5);
    pointer-events: none;
    transform: translate(-50%, -50%);
    display: none;
}

.wheel-picker.active {
    display: block;
}

.lightness-wheel {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    pointer-events: none;
}

.wheel-controls-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.wheel-input-section {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.wheel-input-section label {
    font-weight: 600;
}

.wheel-input-section input {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 1rem;
}

.wheel-brightness {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.wheel-brightness label {
    font-weight: 600;
}

.wheel-brightness input[type="range"] {
    width: 100%;
}

.wheel-result {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.wheel-color-preview {
    width: 100%;
    height: 150px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    border: 2px solid var(--border-color);
}

.wheel-color-codes {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.wheel-harmonies {
    background: var(--bg-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin-top: 2rem;
}

.wheel-harmonies h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.wheel-harmonies select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    margin-bottom: 1.5rem;
}

.harmony-palette {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 1rem;
}

.harmony-color-item {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.harmony-color-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.harmony-swatch {
    width: 100%;
    height: 100px;
}

.harmony-info {
    padding: 0.75rem;
    text-align: center;
}

.harmony-hex {
    font-family: 'Courier New', monospace;
    font-weight: 600;
    font-size: 0.9rem;
}

/* Color Charts */
.color-charts {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.chart-selector {
    margin-bottom: 2rem;
}

.chart-selector select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
}

.chart-display {
    display: grid;
    gap: 2rem;
}

.chart-group {
    background: var(--bg-color);
    border-radius: 12px;
    padding: 1.5rem;
}

.chart-group h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.chart-colors {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 1rem;
}

.chart-color-item {
    background: var(--card-bg);
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.chart-color-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.chart-color-swatch {
    width: 100%;
    height: 80px;
}

.chart-color-info {
    padding: 0.75rem;
    text-align: center;
}

.chart-color-name {
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

.chart-color-hex {
    font-family: 'Courier New', monospace;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Browse Colors */
.browse-colors {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.color-search {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.color-search input {
    flex: 1;
    min-width: 200px;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
}

.color-search select {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
}

.colors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 1rem;
}

.color-card {
    background: var(--bg-color);
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.color-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.color-swatch {
    width: 100%;
    height: 120px;
}

.color-info {
    padding: 1rem;
}

.color-name {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.color-hex {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

@media (max-width: 968px) {
    .content-wrapper {
        grid-template-columns: 1fr;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: var(--card-bg);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow);
        padding: 2rem 0;
        max-height: calc(100vh - 70px);
        overflow-y: auto;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-menu li {
        width: 100%;
    }

    .nav-link {
        display: block;
        padding: 1rem;
        width: 100%;
    }

    .tool-section header h2 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .canvas-comparison {
        grid-template-columns: 1fr;
    }

    .mixer-color-input,
    .gradient-colors,
    .contrast-colors {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .container {
        padding: 1rem;
    }

    .upload-area {
        padding: 2rem 1rem;
    }

    .image-section, .color-section {
        padding: 1.5rem;
    }

    .palette-grid {
        grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
    }

    .seo-content {
        padding: 1.5rem;
        font-size: 0.9rem;
    }

    .seo-content h3 {
        font-size: 1.2rem;
    }

    .wheel-container {
        margin: 0 auto;
    }

    #colorWheelCanvas {
        max-width: 100%;
        height: auto;
    }

    .wheel-main-section {
        grid-template-columns: 1fr;
    }

    .wheel-controls {
        grid-template-columns: 1fr;
    }

    .chart-colors {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    }

    .converter-input {
        flex-direction: column;
    }

    .converter-results {
        grid-template-columns: 1fr;
    }

    .scheme-palette {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }

    .shades-grid {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    }

    .colors-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }

    footer {
        padding: 2rem 1rem 1.5rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        text-align: center;
    }

    .footer-section {
        text-align: center;
    }

    .footer-links {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }

    .footer-links li {
        margin-bottom: 0;
    }
}