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

:root {
    --primary: #2ecc71;
    --primary-dark: #27ae60;
    --secondary: #3498db;
    --dark: #2c3e50;
    --light: #ecf0f1;
    --border: #bdc3c7;
    --success: #2ecc71;
    --warning: #f39c12;
    --danger: #e74c3c;
    --shadow: rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: #f5f7fa;
}

.container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 2rem 2rem 1.5rem;
    box-shadow: 0 2px 10px var(--shadow);
}

.header-content h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.subtitle {
    font-size: 1rem;
    opacity: 0.9;
}

/* Main Content */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 320px;
    background: white;
    border-right: 1px solid var(--border);
    overflow-y: auto;
    padding: 1.5rem;
}

.sidebar h2 {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    color: var(--dark);
}

.section {
    margin-bottom: 2rem;
}

.section h3 {
    font-size: 0.95rem;
    color: var(--dark);
    margin-bottom: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.ontology-btn, .doc-btn {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1rem;
    background: white;
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 0.5rem;
    text-align: left;
    font-size: 0.9rem;
}

.ontology-btn:hover, .doc-btn:hover {
    background: var(--light);
    border-color: var(--primary);
    transform: translateX(4px);
}

.ontology-btn .icon, .doc-btn .icon {
    font-size: 1.2rem;
    flex-shrink: 0;
}

.ontology-btn span:nth-child(2), .doc-btn span:nth-child(2) {
    flex: 1;
    font-weight: 500;
    color: var(--dark);
}

.badge {
    background: var(--primary);
    color: white;
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* Content Area */
.content-area {
    flex: 1;
    overflow: hidden;
    background: white;
}

/* Welcome Screen */
.welcome-screen {
    padding: 3rem;
    max-width: 1200px;
    margin: 0 auto;
}

.welcome-content h2 {
    font-size: 2rem;
    color: var(--dark);
    margin-bottom: 1rem;
}

.welcome-content > p {
    font-size: 1.2rem;
    color: #7f8c8d;
    margin-bottom: 3rem;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.feature-card {
    background: white;
    border: 2px solid var(--light);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s;
}

.feature-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 20px var(--shadow);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.1rem;
    color: var(--dark);
    margin-bottom: 0.5rem;
}

.feature-card p {
    color: #7f8c8d;
    font-size: 0.95rem;
}

.quick-start {
    background: #f8f9fa;
    border-left: 4px solid var(--primary);
    padding: 2rem;
    border-radius: 8px;
}

.quick-start h3 {
    font-size: 1.3rem;
    color: var(--dark);
    margin-bottom: 1rem;
}

.quick-start ol {
    margin-left: 1.5rem;
}

.quick-start li {
    margin-bottom: 0.75rem;
    font-size: 1.05rem;
    color: #555;
}

/* Viewer Container */
.viewer-container {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.viewer-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #fafafa;
}

.viewer-header h2 {
    font-size: 1.3rem;
    color: var(--dark);
}

.viewer-actions {
    display: flex;
    gap: 0.5rem;
}

.action-btn {
    padding: 0.5rem 1rem;
    background: white;
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
}

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

.viewer-content {
    flex: 1;
    overflow: auto;
    padding: 2rem;
}

#viewerCode {
    background: #f8f9fa;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    overflow-x: auto;
    font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--dark);
}

#viewerDoc {
    line-height: 1.8;
}

#viewerDoc h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--dark);
}

#viewerDoc h2 {
    font-size: 1.6rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--dark);
    border-bottom: 2px solid var(--light);
    padding-bottom: 0.5rem;
}

#viewerDoc h3 {
    font-size: 1.3rem;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--dark);
}

#viewerDoc p {
    margin-bottom: 1rem;
    color: #555;
}

#viewerDoc code {
    background: #f8f9fa;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.9em;
}

#viewerDoc pre {
    background: #f8f9fa;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    overflow-x: auto;
    margin: 1rem 0;
}

#viewerDoc pre code {
    background: none;
    padding: 0;
}

#viewerDoc table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
}

#viewerDoc th, #viewerDoc td {
    padding: 0.75rem;
    border: 1px solid var(--border);
    text-align: left;
}

#viewerDoc th {
    background: #f8f9fa;
    font-weight: 600;
}

#viewerDoc ul, #viewerDoc ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

#viewerDoc li {
    margin-bottom: 0.5rem;
}

/* Footer */
.footer {
    background: var(--dark);
    color: white;
    padding: 1.5rem;
    text-align: center;
    font-size: 0.9rem;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}

/* Responsive */
@media (max-width: 768px) {
    .main-content {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .features {
        grid-template-columns: 1fr;
    }
}