:root {
    --bg-dark: #0a0a0f;
    --bg-card: #12121a;
    --bg-elevated: #1a1a25;
    --sidebar-bg: #0d0d14;
    --accent: #8b5cf6;
    --accent-light: #a78bfa;
    --accent-glow: rgba(139, 92, 246, 0.3);
    --success: #10b981;
    --error: #ef4444;
    --warning: #f59e0b;
    --text: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border: #2d2d3a;
    --code-bg: #0d0d12;
    --sidebar-width: 280px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-dark);
    color: var(--text);
    line-height: 1.6;
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border);
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: transform 0.3s ease;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.25rem;
    text-decoration: none;
    color: var(--text);
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--accent), #c084fc);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: white;
}

.version-badge {
    font-size: 0.7rem;
    padding: 0.25rem 0.5rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 20px;
    color: var(--accent-light);
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 1rem 0;
}

.nav-section {
    margin-bottom: 1.5rem;
}

.nav-section-title {
    display: block;
    padding: 0.5rem 1.5rem;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background: var(--bg-elevated);
    color: var(--text);
}

.nav-item.active {
    background: rgba(139, 92, 246, 0.1);
    color: var(--accent-light);
    border-left-color: var(--accent);
}

.nav-item-sub {
    padding-left: 2.5rem;
    font-size: 0.85rem;
}

.nav-icon {
    font-size: 1.1rem;
    width: 24px;
    text-align: center;
}

.sidebar-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--success);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.top-bar {
    padding: 1rem 2rem;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.5rem;
    cursor: pointer;
}

.breadcrumb {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.breadcrumb a {
    color: var(--accent-light);
    text-decoration: none;
}

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

/* Page Sections */
.page-header {
    margin-bottom: 3rem;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, var(--text) 0%, var(--accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 4rem 2rem;
    background: radial-gradient(ellipse at top, rgba(139, 92, 246, 0.15) 0%, transparent 50%);
    border-radius: 20px;
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--text) 0%, var(--accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 50px;
    font-size: 0.85rem;
    color: var(--accent-light);
    margin-bottom: 2rem;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--accent);
    color: white;
    box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
    background: var(--accent-light);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--bg-elevated);
    border-color: var(--accent);
}

.btn-run {
    background: var(--success);
    color: white;
    padding: 0.625rem 1.25rem;
    font-size: 0.9rem;
}

.btn-run:hover { background: #059669; }

.btn-clear {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    padding: 0.625rem 1rem;
    font-size: 0.9rem;
}

.btn-clear:hover { border-color: var(--text-muted); }

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
    transition: all 0.3s;
}

.feature-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 10px 40px rgba(139, 92, 246, 0.1);
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--accent), #c084fc);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1.25rem;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.feature-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Syntax Blocks */
.syntax-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.syntax-block {
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
}

.syntax-header {
    padding: 1rem 1.25rem;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    font-weight: 600;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.syntax-code {
    padding: 1.25rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.syntax-code .keyword { color: #c084fc; font-weight: 500; }
.syntax-code .string { color: #34d399; }
.syntax-code .number { color: #f59e0b; }
.syntax-code .variable { color: #60a5fa; }
.syntax-code .comment { color: var(--text-muted); font-style: italic; }
.syntax-code .tool { color: #f472b6; }

/* Playground */
.playground-container {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.playground-header {
    padding: 1rem 1.5rem;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.playground-title {
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.examples-select {
    background: var(--bg-dark);
    color: var(--text);
    border: 1px solid var(--border);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    cursor: pointer;
    min-width: 250px;
}

.examples-select:focus { outline: none; border-color: var(--accent); }

.playground-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 500px;
}

.editor-panel {
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.panel-header {
    padding: 0.75rem 1rem;
    background: var(--code-bg);
    border-bottom: 1px solid var(--border);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.code-editor {
    flex: 1;
    background: var(--code-bg);
    color: var(--text);
    border: none;
    padding: 1rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    line-height: 1.7;
    resize: none;
    outline: none;
    min-height: 400px;
}

.editor-actions {
    padding: 1rem;
    background: var(--code-bg);
    border-top: 1px solid var(--border);
    display: flex;
    gap: 0.75rem;
    justify-content: flex-end;
}

.output-panel {
    display: flex;
    flex-direction: column;
    background: var(--code-bg);
}

.output-tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
}

.output-tab {
    padding: 0.75rem 1rem;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
    background: none;
    border-top: none;
    border-left: none;
    border-right: none;
}

.output-tab:hover { color: var(--text-secondary); }
.output-tab.active { color: var(--accent); border-bottom-color: var(--accent); }

.output-content {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
}

.output-line { margin-bottom: 0.5rem; }
.output-line.success { color: var(--success); }
.output-line.error { color: var(--error); }
.output-line.info { color: var(--text-muted); }
.output-line.log { color: var(--text-secondary); }

.output-empty {
    color: var(--text-muted);
    text-align: center;
    padding: 2rem;
}

.result-json {
    background: var(--bg-elevated);
    padding: 1rem;
    border-radius: 8px;
    white-space: pre-wrap;
    word-break: break-all;
}

/* Tools Section */
.tools-category {
    margin-bottom: 3rem;
    scroll-margin-top: 2rem;
}

.tools-category-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--accent-light);
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--border);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
}

.tool-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all 0.2s;
}

.tool-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.tool-name {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent-light);
    margin-bottom: 0.5rem;
}

.tool-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
}

.tool-example {
    background: var(--code-bg);
    padding: 0.75rem;
    border-radius: 6px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--text-muted);
    overflow-x: auto;
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-light);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Security Info */
.security-section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
    margin-top: 2rem;
}

.security-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.security-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.security-icon {
    width: 40px;
    height: 40px;
    background: rgba(16, 185, 129, 0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.security-text h4 {
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
}

.security-text p {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* Loading & Spinner */
.loading {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
}

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Mobile Responsive */
@media (max-width: 900px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .playground-body {
        grid-template-columns: 1fr;
    }
    
    .editor-panel {
        border-right: none;
        border-bottom: 1px solid var(--border);
    }
}

@media (max-width: 768px) {
    .page-content {
        padding: 1.5rem;
    }
    
    .hero {
        padding: 2rem 1rem;
    }
    
    .playground-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .examples-select {
        min-width: 100%;
    }
}

/* Contact Links */
.contact-links {
    display: flex;
    gap: 0.75rem;
    padding: 0 1rem;
    margin-bottom: 1rem;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.8rem;
    transition: all 0.2s;
    flex: 1;
    justify-content: center;
}

.contact-link:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.contact-link svg {
    flex-shrink: 0;
}

/* Footer Section */
.footer-section {
    margin-top: 4rem;
    padding: 3rem 0;
    border-top: 1px solid var(--border);
    text-align: center;
}

.footer-title {
    color: var(--text);
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.footer-desc {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

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

.footer-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s;
}

.footer-link:hover {
    background: var(--accent);
    border-color: var(--accent);
    transform: translateY(-2px);
}

.footer-link svg {
    width: 20px;
    height: 20px;
}