/* TrafficTwin -- Urban dark theme with map-like styling */

:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-card: #1c2128;
    --bg-hover: #252b33;
    --border-color: #30363d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --accent-blue: #58a6ff;
    --accent-green: #3fb950;
    --accent-yellow: #d29922;
    --accent-red: #f85149;
    --accent-orange: #db6d28;
    --accent-purple: #bc8cff;
    --road-color: #2d333b;
    --road-line: #444c56;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --radius: 8px;
    --shadow: 0 2px 8px rgba(0,0,0,0.3);
}

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

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navigation */
.navbar {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 0 2rem;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-brand a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1.25rem;
    font-weight: 700;
}

.nav-icon { font-size: 1.4rem; }

.nav-links {
    display: flex;
    gap: 0.25rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 500;
    transition: background 0.2s, color 0.2s;
}

.nav-link:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
    flex: 1;
}

/* Hero */
.hero {
    text-align: center;
    padding: 3rem 1rem;
    margin-bottom: 2rem;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, #1a2332 100%);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.hero-desc {
    max-width: 600px;
    margin: 0 auto 1.5rem;
    color: var(--text-muted);
}

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

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

.card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1.25rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
    background: var(--bg-hover);
    color: var(--text-primary);
    font-family: var(--font-sans);
}

.btn:hover { border-color: var(--accent-blue); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: #1f6feb; border-color: #1f6feb; color: #fff; }
.btn-primary:hover { background: #388bfd; }
.btn-secondary { background: var(--bg-secondary); }
.btn-success { background: #238636; border-color: #238636; color: #fff; }
.btn-success:hover { background: #2ea043; }
.btn-warning { background: #9e6a03; border-color: #9e6a03; color: #fff; }
.btn-warning:hover { background: #bb8009; }
.btn-danger { background: #da3633; border-color: #da3633; color: #fff; }
.btn-danger:hover { background: #f85149; }
.btn-sm { padding: 0.3rem 0.75rem; font-size: 0.8rem; }
.btn-block { width: 100%; }

/* Forms */
.form { display: flex; flex-direction: column; gap: 0.75rem; }

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input,
.form-group select {
    padding: 0.5rem 0.75rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-family: var(--font-sans);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(88,166,255,0.15);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
}

/* Tables */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.data-table th,
.data-table td {
    padding: 0.6rem 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table tbody tr:hover { background: var(--bg-hover); }

/* Status badges */
.status-badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.status-created { background: rgba(88,166,255,0.15); color: var(--accent-blue); }
.status-running { background: rgba(63,185,80,0.15); color: var(--accent-green); }
.status-paused { background: rgba(210,153,34,0.15); color: var(--accent-yellow); }
.status-completed { background: rgba(139,148,158,0.15); color: var(--text-secondary); }

/* Dashboard grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stats-card .stat-row {
    display: flex;
    gap: 2rem;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-blue);
    font-family: var(--font-mono);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Preset list */
.preset-list { display: flex; flex-direction: column; gap: 0.75rem; }

.preset-item {
    padding: 0.75rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
}

.preset-item strong { color: var(--accent-blue); }
.preset-item p { font-size: 0.85rem; color: var(--text-secondary); margin: 0.25rem 0; }

.preset-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

/* Simulation layout */
.sim-layout {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 1.5rem;
}

.sim-sidebar { display: flex; flex-direction: column; gap: 1rem; }

.control-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

/* Canvas */
.canvas-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 500px;
}

#traffic-canvas {
    border-radius: 4px;
    background: var(--bg-primary);
}

.legend {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.legend-color {
    width: 14px;
    height: 14px;
    border-radius: 3px;
    display: inline-block;
}

/* Info grid */
.info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.info-item {
    display: flex;
    flex-direction: column;
    padding: 0.5rem;
    background: var(--bg-primary);
    border-radius: var(--radius);
}

.info-label { font-size: 0.75rem; color: var(--text-muted); }
.info-value { font-size: 1.1rem; font-weight: 600; font-family: var(--font-mono); color: var(--accent-blue); }

/* Analytics */
.analytics-controls {
    display: flex;
    gap: 1rem;
    align-items: flex-end;
    margin-bottom: 1.5rem;
}

.analytics-controls .form-group { flex: 1; }

.analytics-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.metric-card {
    text-align: center;
    padding: 1.25rem;
}

.metric-card h4 {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.metric-value {
    font-size: 1.8rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--accent-green);
}

.metric-unit {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.analytics-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.bar-chart {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    height: 150px;
    padding: 0.5rem 0;
}

.bar-chart .bar {
    flex: 1;
    background: var(--accent-blue);
    border-radius: 4px 4px 0 0;
    position: relative;
    min-width: 20px;
    transition: height 0.3s;
}

.bar-chart .bar-label {
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.7rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.bar-chart .bar-value {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.7rem;
    color: var(--text-secondary);
    font-family: var(--font-mono);
}

/* Features */
.features-section { margin-top: 2rem; }
.features-section h2 { font-size: 1.5rem; margin-bottom: 1rem; text-align: center; }

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    text-align: center;
    transition: border-color 0.2s;
}

.feature-card:hover { border-color: var(--accent-blue); }
.feature-icon { font-size: 2rem; margin-bottom: 0.75rem; }
.feature-card h4 { font-size: 1rem; margin-bottom: 0.5rem; }
.feature-card p { font-size: 0.85rem; color: var(--text-secondary); }

/* Intersections layout */
.intersections-layout {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* About */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.about-grid .card p { color: var(--text-secondary); margin-bottom: 0.75rem; }
.about-grid .card ol, .about-grid .card ul { padding-left: 1.25rem; color: var(--text-secondary); }
.about-grid .card li { margin-bottom: 0.5rem; }

.tech-list {
    list-style: none;
    padding: 0;
}

.tech-list li {
    padding: 0.4rem 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
}

.tech-list li:last-child { border-bottom: none; }

/* Page headers */
.page-header {
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
}

.page-header p {
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

/* Footer */
.footer {
    text-align: center;
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: 2rem;
}

.empty-state {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-style: italic;
}

/* Congestion zone pills */
.zone-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.75rem;
    margin: 0.25rem;
    border-radius: 16px;
    font-size: 0.8rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
}

.zone-severity-low { border-color: var(--accent-green); color: var(--accent-green); }
.zone-severity-moderate { border-color: var(--accent-yellow); color: var(--accent-yellow); }
.zone-severity-high { border-color: var(--accent-orange); color: var(--accent-orange); }
.zone-severity-severe { border-color: var(--accent-red); color: var(--accent-red); }

/* Responsive */
@media (max-width: 1024px) {
    .dashboard-grid,
    .analytics-details,
    .about-grid { grid-template-columns: 1fr; }
    .sim-layout { grid-template-columns: 1fr; }
    .analytics-grid { grid-template-columns: repeat(2, 1fr); }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .navbar { padding: 0 1rem; }
    .container { padding: 1rem; }
    .analytics-grid { grid-template-columns: 1fr; }
    .features-grid { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .hero h1 { font-size: 1.8rem; }
    .hero-actions { flex-direction: column; align-items: center; }
}