:root {
  color-scheme: dark;
  --bg: #071017;
  --surface: #0d1820;
  --surface-2: #102330;
  --line: rgba(178, 210, 225, 0.16);
  --line-strong: rgba(96, 202, 196, 0.42);
  --text: #e8f1f2;
  --muted: #90a5ad;
  --teal: #5eead4;
  --green: #86efac;
  --amber: #fbbf24;
  --red: #fb7185;
  --violet: #a78bfa;
  --shadow: 0 18px 55px rgba(0, 0, 0, 0.34);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
}

body {
  background:
    linear-gradient(180deg, rgba(94, 234, 212, 0.08), transparent 32rem),
    var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
select {
  font: inherit;
}

.app-shell {
  width: min(1180px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 24px 0;
}

.topbar,
.control-strip,
.metric-grid,
.workspace {
  width: 100%;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--teal);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  font-size: clamp(28px, 5vw, 48px);
  line-height: 1;
}

h2 {
  font-size: 18px;
  line-height: 1.2;
}

.connection-panel,
.pill,
.status-line,
select {
  border: 1px solid var(--line);
  background: rgba(13, 24, 32, 0.86);
  color: var(--muted);
}

.connection-panel {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 38px;
  padding: 0 14px;
  border-radius: 999px;
  white-space: nowrap;
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 18px rgba(134, 239, 172, 0.8);
}

.status-dot.is-paused {
  background: var(--amber);
  box-shadow: 0 0 18px rgba(251, 191, 36, 0.75);
}

.control-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px;
  margin-bottom: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(13, 24, 32, 0.78);
  box-shadow: var(--shadow);
}

.segmented,
.run-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.segment,
.icon-button {
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--muted);
  cursor: pointer;
  transition: border-color 160ms ease, background 160ms ease, color 160ms ease, transform 160ms ease;
}

.segment {
  min-width: 72px;
  padding: 0 14px;
}

.segment:hover,
.icon-button:hover {
  border-color: var(--line-strong);
  color: var(--text);
}

.segment.is-active {
  border-color: rgba(94, 234, 212, 0.72);
  background: rgba(94, 234, 212, 0.12);
  color: var(--teal);
}

.icon-button {
  display: inline-grid;
  place-items: center;
  width: 42px;
  font-weight: 800;
}

.icon-button.primary {
  background: var(--teal);
  color: #04201f;
  border-color: var(--teal);
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.metric-card,
.maze-panel,
.side-panel > section {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(16, 35, 48, 0.92), rgba(13, 24, 32, 0.92));
  box-shadow: var(--shadow);
}

.metric-card {
  min-height: 126px;
  padding: 16px;
}

.metric-card span {
  display: block;
  min-height: 22px;
  color: var(--muted);
  font-size: 13px;
}

.metric-card strong {
  display: block;
  margin: 10px 0 12px;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1;
  letter-spacing: 0;
}

.bar,
.trend,
.status-line {
  height: 8px;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.08);
}

.bar i {
  display: block;
  height: 100%;
  width: 91%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--green), var(--teal));
  transition: width 240ms ease;
}

.trend {
  position: relative;
}

.trend::before {
  content: "";
  position: absolute;
  inset: 0;
  width: 64%;
  border-radius: inherit;
  background: repeating-linear-gradient(90deg, var(--teal) 0 10px, rgba(94, 234, 212, 0.2) 10px 18px);
}

.trend.calm::before {
  width: 46%;
  background: var(--violet);
}

.status-line {
  display: flex;
  align-items: center;
  height: 28px;
  padding: 0 10px;
  color: var(--muted);
  font-size: 12px;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 16px;
  align-items: start;
}

.maze-panel,
.side-panel > section {
  padding: 16px;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.panel-header.compact {
  margin-bottom: 12px;
}

.pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 30px;
  padding: 0 10px;
  border-radius: 999px;
  font-size: 12px;
  white-space: nowrap;
}

.pill.success {
  border-color: rgba(134, 239, 172, 0.38);
  color: var(--green);
}

.maze-wrap {
  display: grid;
  place-items: center;
  min-height: 470px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(94, 234, 212, 0.06), transparent 46%),
    #08121a;
  overflow: hidden;
}

.maze-grid {
  display: grid;
  width: min(92%, 520px);
  aspect-ratio: 1;
  border: 2px solid rgba(232, 241, 242, 0.7);
  background: #0a151d;
}

.cell {
  position: relative;
  min-width: 0;
  border-right: 1px solid rgba(232, 241, 242, 0.23);
  border-bottom: 1px solid rgba(232, 241, 242, 0.23);
  background: rgba(255, 255, 255, 0.015);
}

.cell.is-path {
  background: rgba(94, 234, 212, 0.16);
}

.cell.is-visited {
  background: rgba(167, 139, 250, 0.12);
}

.cell.is-goal::after,
.cell.is-robot::after {
  content: "";
  position: absolute;
  inset: 26%;
  border-radius: 50%;
}

.cell.is-goal::after {
  border: 2px solid var(--amber);
  background: rgba(251, 191, 36, 0.16);
}

.cell.is-robot::after {
  inset: 22%;
  background: var(--teal);
  box-shadow: 0 0 22px rgba(94, 234, 212, 0.9);
}

.cell.wall-top {
  border-top: 3px solid rgba(232, 241, 242, 0.82);
}

.cell.wall-left {
  border-left: 3px solid rgba(232, 241, 242, 0.82);
}

.cell.wall-right {
  border-right: 3px solid rgba(232, 241, 242, 0.82);
}

.cell.wall-bottom {
  border-bottom: 3px solid rgba(232, 241, 242, 0.82);
}

.side-panel {
  display: grid;
  gap: 16px;
}

.summary-list {
  display: grid;
  gap: 8px;
  margin: 0;
}

.summary-list div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(7, 16, 23, 0.5);
}

dt {
  color: var(--muted);
  font-size: 12px;
}

dd {
  margin: 0;
  font-weight: 800;
}

select {
  min-height: 34px;
  border-radius: 6px;
  padding: 0 10px;
}

.history-list {
  display: grid;
  gap: 8px;
  max-height: 286px;
  overflow: auto;
  padding-right: 3px;
}

.history-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px 10px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(7, 16, 23, 0.5);
}

.history-item strong {
  font-size: 14px;
}

.history-item span,
.history-item small {
  color: var(--muted);
  font-size: 12px;
}

.history-item .ok {
  color: var(--green);
}

@media (max-width: 980px) {
  .metric-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .side-panel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 700px) {
  .app-shell {
    width: min(100vw - 20px, 680px);
    padding: 12px 0;
  }

  .topbar,
  .control-strip {
    align-items: stretch;
    flex-direction: column;
  }

  .connection-panel,
  .segmented,
  .run-actions {
    width: 100%;
  }

  .segment {
    flex: 1;
    min-width: 0;
  }

  .metric-grid,
  .side-panel {
    grid-template-columns: 1fr;
  }

  .maze-wrap {
    min-height: 330px;
  }
}