:root {
    --bg-canvas: #0f1419;
    --bg-panel: #1a2028;
    --bg-elevated: #222b36;
    --bg-soft: #151b22;
    --text-primary: #e5e7eb;
    --text-muted: #9ca3af;
    --accent-blue: #3b82f6;
    --status-ok: #10b981;
    --status-warn: #f59e0b;
    --status-error: #ef4444;
    --road-asphalt: #3a4048;
    --road-marking: #ffffff;
    --line-soft: rgba(255,255,255,0.08);
    --shadow-soft: 0 18px 40px rgba(0,0,0,0.28);
    --font-ui: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Consolas, monospace;
}

* {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
    margin: 0;
    overflow: hidden;
    background: var(--bg-canvas);
    color: var(--text-primary);
    font-family: var(--font-ui);
    font-size: 14px;
}

button,
input,
select,
textarea {
    font: inherit;
}

button {
    cursor: pointer;
}

button:disabled,
.is-disabled {
    cursor: not-allowed;
    opacity: 0.45;
}

.app-shell {
    height: 100vh;
    display: grid;
    grid-template-columns: 260px 1fr 340px;
    grid-template-rows: 64px 1fr 184px;
    grid-template-areas:
        "topbar topbar topbar"
        "left canvas right"
        "bottom bottom bottom";
    background: var(--bg-canvas);
}

.topbar {
    grid-area: topbar;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 10px 16px;
    border-bottom: 1px solid var(--line-soft);
    background: rgba(15, 20, 25, 0.94);
    backdrop-filter: blur(18px);
}

.brand-block {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 300px;
}

.brand-mark {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    display: grid;
    place-items: center;
    color: white;
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    font-weight: 800;
    letter-spacing: -0.05em;
    box-shadow: var(--shadow-soft);
}

.brand-title {
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 0.01em;
}

.brand-subtitle {
    margin-top: 2px;
    color: var(--text-muted);
    font-size: 12px;
}

.topbar-tabs {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 4px;
    border: 1px solid var(--line-soft);
    border-radius: 14px;
    background: var(--bg-soft);
}

.tab-button,
.ghost-button,
.primary-button {
    border: 0;
    color: var(--text-primary);
    border-radius: 10px;
    padding: 8px 12px;
    background: transparent;
}

.tab-button.is-active {
    background: var(--bg-elevated);
    box-shadow: 0 1px 0 rgba(255,255,255,0.06) inset;
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.primary-button {
    background: var(--accent-blue);
    color: #fff;
    font-weight: 700;
}

.ghost-button {
    background: var(--bg-elevated);
    border: 1px solid var(--line-soft);
}

.speed-control {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 12px;
}

.speed-control strong {
    color: var(--text-primary);
    min-width: 22px;
}

.left-rail,
.right-rail {
    background: var(--bg-panel);
    border-right: 1px solid var(--line-soft);
    overflow: auto;
    padding: 14px;
}

.left-rail {
    grid-area: left;
}

.right-rail {
    grid-area: right;
    border-right: 0;
    border-left: 1px solid var(--line-soft);
}

.nav-block {
    display: grid;
    gap: 6px;
    margin-bottom: 14px;
}

.nav-item {
    display: flex;
    align-items: center;
    height: 36px;
    padding: 0 12px;
    border-radius: 10px;
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 600;
}

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

.panel {
    border: 1px solid var(--line-soft);
    border-radius: 16px;
    background: var(--bg-soft);
    box-shadow: 0 1px 0 rgba(255,255,255,0.04) inset;
}

.small-panel {
    padding: 14px;
    margin-bottom: 14px;
}

.panel h2,
.metric-card h3 {
    margin: 0 0 10px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.muted {
    margin: 0 0 12px;
    color: var(--text-muted);
    font-size: 12px;
}

.mini-stats {
    display: grid;
    gap: 8px;
    margin: 0;
}

.mini-stats div {
    display: flex;
    justify-content: space-between;
    gap: 12px;
}

.mini-stats dt {
    color: var(--text-muted);
}

.mini-stats dd {
    margin: 0;
    font-family: var(--font-mono);
}

.check-row {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    margin: 8px 0;
}

.canvas-region {
    grid-area: canvas;
    position: relative;
    overflow: hidden;
    background:
        radial-gradient(circle at center, rgba(59,130,246,0.08), transparent 45%),
        var(--bg-canvas);
}

#simulationCanvas {
    width: 100%;
    height: 100%;
    display: block;
}

.canvas-hud {
    position: absolute;
    left: 16px;
    bottom: 16px;
    display: flex;
    gap: 8px;
    pointer-events: none;
}

.canvas-hud span,
.badge {
    display: inline-flex;
    align-items: center;
    height: 26px;
    padding: 0 10px;
    border: 1px solid var(--line-soft);
    border-radius: 999px;
    background: rgba(26,32,40,0.86);
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 12px;
}

.inspector-panel {
    min-height: calc(100% - 4px);
    padding: 14px;
}

.panel-heading {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.inspector-content {
    display: grid;
    gap: 12px;
}

.inspector-section {
    padding: 12px;
    border: 1px solid var(--line-soft);
    border-radius: 14px;
    background: var(--bg-elevated);
}

.inspector-section h3 {
    margin: 0 0 10px;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
}

.kv-table {
    display: grid;
    gap: 7px;
}

.kv-row {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 10px;
    align-items: baseline;
    color: var(--text-muted);
    font-size: 12px;
}

.kv-row strong {
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-weight: 600;
    text-align: right;
}

.consequence-list {
    display: grid;
    gap: 8px;
}

.consequence-item {
    padding: 8px 9px;
    border-radius: 10px;
    background: rgba(255,255,255,0.04);
    border-left: 3px solid var(--status-ok);
    font-size: 12px;
}

.consequence-item.warning {
    border-left-color: var(--status-warn);
}

.consequence-item.critical {
    border-left-color: var(--status-error);
}

.consequence-item span {
    display: block;
    margin-top: 3px;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 11px;
}

.bottom-dashboard {
    grid-area: bottom;
    display: grid;
    grid-template-columns: 320px 1fr 320px;
    gap: 12px;
    padding: 12px;
    border-top: 1px solid var(--line-soft);
    background: var(--bg-panel);
    overflow: hidden;
}

.metric-card {
    padding: 14px;
    border: 1px solid var(--line-soft);
    border-radius: 16px;
    background: var(--bg-soft);
    overflow: hidden;
}

.metric-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.metric-grid div {
    padding: 10px;
    border-radius: 12px;
    background: var(--bg-elevated);
}

.metric-grid span {
    display: block;
    color: var(--text-muted);
    font-size: 11px;
    margin-bottom: 5px;
}

.metric-grid strong {
    font-family: var(--font-mono);
    font-size: 16px;
}

.event-log {
    height: 118px;
    overflow: auto;
    display: grid;
    align-content: start;
    gap: 6px;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-muted);
}

.event-row {
    display: grid;
    grid-template-columns: 64px 130px 1fr;
    gap: 8px;
    padding: 6px 8px;
    border-radius: 9px;
    background: var(--bg-elevated);
}

@media (max-width: 1100px) {
    .app-shell {
        grid-template-columns: 220px 1fr 300px;
    }

    .brand-subtitle,
    .topbar-tabs {
        display: none;
    }
}