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

:root {
    --primary-color: #8b5cf6;
    --primary-hover: #7c3aed;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    --background: #0f172a;
    --surface: #1e293b;
    --surface-light: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --border: #475569;
    --code-bg: #1e1e1e;
    --match-bg: rgba(139, 92, 246, 0.3);
    --match-border: #8b5cf6;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 20px;
    line-height: 1.6;
}

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

header {
    text-align: center;
    margin-bottom: 40px;
    padding: 20px;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    background: linear-gradient(135deg, #8b5cf6 0%, #ec4899 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Engine Selector */
.engine-selector {
    background: var(--surface);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.engine-selector h3 {
    margin-bottom: 15px;
    color: var(--text-primary);
}

.engine-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.engine-checkbox {
    display: flex;
    align-items: center;
    cursor: pointer;
    padding: 12px;
    background: var(--surface-light);
    border: 2px solid var(--border);
    border-radius: 8px;
    transition: all 0.3s ease;
}

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

.engine-checkbox input {
    margin-right: 10px;
    cursor: pointer;
    width: 18px;
    height: 18px;
}

.engine-checkbox input:checked + .engine-label {
    color: var(--primary-color);
    font-weight: 600;
}

.engine-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1rem;
    color: var(--text-primary);
}

.engine-icon {
    font-size: 1.3rem;
}

/* Pattern Section */
.pattern-section,
.test-section,
.results-section,
.comparison-section,
.reference-section {
    background: var(--surface);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    flex-wrap: wrap;
    gap: 10px;
}

.section-header h3 {
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.pattern-actions {
    display: flex;
    gap: 10px;
}

.pattern-input-container {
    margin-bottom: 15px;
}

.pattern-input-wrapper {
    display: flex;
    align-items: center;
    background: var(--code-bg);
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: 5px 15px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 1.1rem;
    transition: border-color 0.3s ease;
}

.pattern-input-wrapper:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.pattern-delimiter {
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: bold;
    padding: 0 5px;
}

.pattern-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 1.1rem;
    padding: 10px;
    outline: none;
}

.flags-input {
    background: transparent;
    border: none;
    color: var(--warning-color);
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 1.1rem;
    padding: 10px;
    outline: none;
    width: 80px;
    text-align: center;
}

.flags-helper {
    display: flex;
    gap: 10px;
    margin-top: 10px;
    flex-wrap: wrap;
}

.flag-hint {
    padding: 4px 10px;
    background: var(--surface-light);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-family: 'Consolas', monospace;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.flag-hint:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.pattern-info {
    margin-top: 10px;
    padding: 10px;
    background: var(--surface-light);
    border-left: 3px solid var(--info-color);
    border-radius: 4px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Test Input */
.test-input {
    width: 100%;
    padding: 15px;
    background: var(--code-bg);
    color: var(--text-primary);
    border: 2px solid var(--border);
    border-radius: 8px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 1rem;
    line-height: 1.6;
    resize: vertical;
    outline: none;
    transition: border-color 0.3s ease;
}

.test-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.85rem;
}

.btn-xs {
    padding: 4px 10px;
    font-size: 0.8rem;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(139, 92, 246, 0.4);
}

.btn-secondary {
    background: var(--surface-light);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--border);
}

/* Results Section */
.results-container {
    display: grid;
    gap: 20px;
}

.engine-result {
    background: var(--surface-light);
    border-radius: 8px;
    padding: 15px;
    border: 2px solid var(--border);
}

.engine-result.success {
    border-color: var(--success-color);
}

.engine-result.error {
    border-color: var(--error-color);
}

.engine-result.warning {
    border-color: var(--warning-color);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border);
}

.engine-name {
    font-size: 1.1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.result-status {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.result-status.success {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success-color);
}

.result-status.error {
    background: rgba(239, 68, 68, 0.2);
    color: var(--error-color);
}

.result-status.warning {
    background: rgba(245, 158, 11, 0.2);
    color: var(--warning-color);
}

.result-content {
    background: var(--code-bg);
    padding: 15px;
    border-radius: 6px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.95rem;
    line-height: 1.8;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.match-highlight {
    background: var(--match-bg);
    border-bottom: 2px solid var(--match-border);
    padding: 2px 4px;
    border-radius: 3px;
    font-weight: 600;
}

.match-info {
    margin-top: 10px;
    padding: 10px;
    background: rgba(139, 92, 246, 0.1);
    border-radius: 6px;
    font-size: 0.9rem;
}

.match-count {
    color: var(--primary-color);
    font-weight: 600;
}

.groups-info {
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--border);
}

.group-item {
    margin: 5px 0;
    color: var(--text-secondary);
}

.group-name {
    color: var(--primary-color);
    font-weight: 600;
}

.error-message {
    color: var(--error-color);
    padding: 10px;
    background: rgba(239, 68, 68, 0.1);
    border-radius: 6px;
    margin-top: 10px;
}

.warning-message {
    color: var(--warning-color);
    padding: 10px;
    background: rgba(245, 158, 11, 0.1);
    border-radius: 6px;
    margin-top: 10px;
    font-size: 0.9rem;
}

/* Comparison Table */
.comparison-table {
    margin-top: 15px;
    overflow-x: auto;
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
}

.comparison-table th,
.comparison-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.comparison-table th {
    background: var(--surface-light);
    font-weight: 600;
    color: var(--text-primary);
}

.comparison-table td {
    color: var(--text-secondary);
}

.comparison-table .supported {
    color: var(--success-color);
    font-weight: 600;
    text-align: center;
}

.comparison-table .not-supported {
    color: var(--error-color);
    font-weight: 600;
    text-align: center;
}

/* Reference Section */
.reference-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--border);
    overflow-x: auto;
}

.ref-tab {
    padding: 10px 20px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.ref-tab:hover {
    color: var(--text-primary);
}

.ref-tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.ref-panel {
    display: none;
}

.ref-panel.active {
    display: block;
}

/* Pattern Cards */
.patterns-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 15px;
}

.pattern-card {
    background: var(--surface-light);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.pattern-card:hover {
    background: var(--border);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(139, 92, 246, 0.3);
    border-color: var(--primary-color);
}

.pattern-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.pattern-card code {
    display: block;
    background: var(--code-bg);
    padding: 8px;
    border-radius: 4px;
    font-size: 0.85rem;
    color: var(--primary-color);
    overflow-x: auto;
}

/* Syntax Guide */
.syntax-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.syntax-group h4 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.syntax-table {
    width: 100%;
}

.syntax-table tr {
    border-bottom: 1px solid var(--border);
}

.syntax-table td {
    padding: 8px;
    color: var(--text-secondary);
}

.syntax-table td:first-child {
    font-family: 'Consolas', monospace;
    color: var(--primary-color);
    font-weight: 600;
}

/* Examples */
.examples-list {
    display: grid;
    gap: 15px;
}

.example-item {
    background: var(--surface-light);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 15px;
}

.example-item h4 {
    color: var(--text-primary);
    margin-bottom: 10px;
}

.example-details {
    display: grid;
    gap: 8px;
    font-size: 0.9rem;
}

.example-details code {
    background: var(--code-bg);
    padding: 2px 6px;
    border-radius: 3px;
    color: var(--primary-color);
}

.try-example {
    margin-top: 10px;
}

/* Footer */
footer {
    text-align: center;
    padding: 30px 20px;
    color: var(--text-secondary);
}

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

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

.footer-note {
    margin-top: 10px;
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    .engine-options {
        grid-template-columns: 1fr;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .pattern-actions {
        width: 100%;
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .patterns-grid,
    .syntax-grid {
        grid-template-columns: 1fr;
    }
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--surface);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}