:root {
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #334155;
    --border-color: #e2e8f0;
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    --danger-color: #ef4444;
    --code-bg: #1e293b;
    --code-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    padding: 1.5rem;
}

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

.header {
    text-align: center;
    margin-bottom: 2rem;
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    justify-content: center;
}

.badge {
    font-size: 0.75rem;
    font-weight: 600;
    background-color: #dbeafe;
    color: #1e40af;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
}

.header p {
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.two-column-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.form-section, .preview-section {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 1.25rem;
}

label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

label i {
    color: var(--primary-color);
    width: 1.25rem;
}

input, select {
    width: 100%;
    padding: 0.625rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.875rem;
    transition: all 0.2s;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.1);
}

.rule-row {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    align-items: center;
}

.rule-row select {
    width: 100px;
    flex-shrink: 0;
}

.rule-row input {
    flex-grow: 1;
}

.remove-rule-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--secondary-color);
    cursor: pointer;
    padding: 0 0.25rem;
    line-height: 1;
    visibility: visible !important;
}

.remove-rule-btn:not(:disabled):hover {
    color: var(--danger-color);
}

.btn-secondary, .btn-icon, .template-btn, .reset-btn {
    background-color: #f1f5f9;
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-secondary);
}

.btn-secondary:hover, .btn-icon:hover, .template-btn:hover {
    background-color: #e2e8f0;
    border-color: #cbd5e1;
}

#add-rule-btn {
    margin-top: 0.25rem;
}

.template-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
}

.reset-btn {
    background-color: #fee2e2;
    color: #991b1b;
    border-color: #fecaca;
}

.reset-btn:hover {
    background-color: #fecaca;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.action-buttons {
    display: flex;
    gap: 0.5rem;
}

.code-preview {
    background-color: var(--code-bg);
    color: var(--code-color);
    padding: 1rem;
    border-radius: var(--radius-md);
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-all;
    max-height: 400px;
    overflow-y: auto;
    margin-bottom: 1.5rem;
}

.tester-section {
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
}

.tester-section h3 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
}

.tester-input-group {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.tester-input-group input {
    flex-grow: 1;
}

.test-result {
    background-color: #f1f5f9;
    padding: 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
    border-left: 4px solid var(--secondary-color);
}

.test-result.allowed {
    border-left-color: #22c55e;
    background-color: #f0fdf4;
    color: #166534;
}

.test-result.disallowed {
    border-left-color: var(--danger-color);
    background-color: #fef2f2;
    color: #991b1b;
}

.tester-note {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.faq-section {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
}

.faq-section h3 {
    margin-bottom: 1rem;
}

details {
    margin-bottom: 0.75rem;
    padding: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

summary {
    font-weight: 500;
    cursor: pointer;
}

.tooltip-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.25rem;
    height: 1.25rem;
    background-color: #cbd5e1;
    color: #0f172a;
    border-radius: 9999px;
    font-size: 0.7rem;
    font-weight: bold;
    cursor: help;
}

@media (max-width: 768px) {
    body {
        padding: 1rem;
    }
    .two-column-layout {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    .template-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    .tester-input-group {
        flex-direction: column;
    }
}