:root {
    --primary-color: #007bff;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-600: #6c757d;
    --gray-900: #212529;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--gray-900);
    background-color: var(--gray-100);
}

.sr-only {
    position: relative;
    display: block !important;
    width: 1px !important;
    height: 1px !important;
    margin: -1px !important;
    padding: 0;
    border: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
}

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

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

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    color: var(--gray-900);
}

header p {
    color: var(--gray-600);
    font-size: 1.1rem;
}

.color-contrast-container {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.color-contrast-form {
    margin-bottom: 2rem;
}

.color-fields {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.color-field {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.hex-input {
    padding: 0.75rem 1rem;
    border: 2px solid var(--gray-300);
    border-radius: 4px;
    font-size: 1rem;
    width: 150px;
    transition: border-color 0.2s;
}

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

.color-preview {
    width: 36px;
    height: 36px;
    border-radius: 4px;
    border: 2px solid var(--gray-300);
}

.button-group {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

button {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

.add-color-button {
    background-color: var(--gray-200);
    color: var(--gray-900);
}

.add-color-button:hover {
    background-color: var(--gray-300);
}

.generate-table-button {
    background-color: var(--primary-color);
    color: white;
}

.generate-table-button:hover {
    background-color: #0056b3;
}

.contrast-table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
}

.contrast-table th,
.contrast-table td {
    border: 1px solid var(--gray-300);
    padding: 1rem;
    text-align: center;
}

.contrast-table th {
    background-color: var(--gray-100);
    font-weight: bold;
}

.contrast-pass {
    color: var(--success-color);
}

.contrast-warn {
    color: var(--warning-color);
}

.contrast-fail {
    color: var(--danger-color);
}

.contrast-cell-same {
    display: block;
    width: 100%;
    height: 100%;
    background-color: var(--gray-100);
}

.contrast-legend {
    background: var(--gray-100);
    padding: 1.5rem;
    border-radius: 4px;
    border: 1px solid var(--gray-300);
}

.contrast-legend p {
    margin: 0.5rem 0;
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.95rem;
}

.contrast-legend span {
    font-size: 1.2rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
}

.contrast-legend .contrast-cell-same {
    border: 1px solid var(--gray-300);
    border-radius: 4px;
}

footer {
    margin-top: 3rem;
    text-align: center;
    color: var(--gray-600);
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .color-contrast-container {
        padding: 1rem;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .hex-input {
        width: 120px;
    }
}

.delete-color-button {
    background: none;
    border: none;
    color: var(--danger-color);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0 0.5rem;
}

.delete-color-button:hover {
    color: #dc3545;
}