:root {
  color-scheme: light dark;
  font-family: "Segoe UI", Roboto, sans-serif;
  background: #111922;
  color: #f3f4f6;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
button, select { font: inherit; }
:focus-visible { outline: 3px solid #7dd3fc; outline-offset: 3px; }
.page-header { width: min(100%, 1080px); display: grid; gap: 16px; }
.page-header .home-button { justify-self: start; }
.page-header p { margin: 0; text-align: center; color: #cbd5e1; }
h2 { margin: 0 0 12px; font-size: 1.1rem; }
h3 { margin: 12px 0 0; font-size: 0.95rem; font-weight: 600; }
.playback-controls { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
select { padding: 9px; background: #0f172a; border: 1px solid #64748b; border-radius: 8px; color: #f1f5f9; max-width: 100%; }
button.secondary { background: #25354c; border: 1px solid #64748b; }
.legend { margin: 0; }
#policy-description { min-height: 3em; margin: 12px 0; }
#playback-status { min-height: 2.6em; margin-top: 8px; }
.state-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin: 6px 0; }
.state-grid div { background: #0f172a; padding: 8px; border-radius: 8px; }
dt { color: #b5c2d3; font-size: 0.82rem; }
dd { margin: 0; font-size: 0.9rem; font-variant-numeric: tabular-nums; }
.decision { color: #7dd3fc; font-size: 0.9rem; margin: 12px 0 0; }
.training-buttons { display: flex; flex-wrap: wrap; gap: 8px; margin: 4px 0; }
progress { width: 100%; accent-color: #38bdf8; height: 10px; }
#status { min-height: 4.5em; }
.stats { margin: 0; }
.stats div { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.stats dd { color: #e2e8f0; font-size: 1rem; }
.controls { min-width: 0; gap: 16px; }
.train-key { color: #4ade80; }
.eval-key { color: #7dd3fc; }
.explanation ol { margin: 0; padding-left: 1.3em; line-height: 1.7; font-size: 0.88rem; color: #cbd5e1; }
.explanation li + li { margin-top: 8px; }
details { border-top: 1px solid #334155; margin-top: 8px; padding-top: 12px; }
summary { cursor: pointer; font-size: 0.88rem; color: #7dd3fc; }
details p { margin-top: 12px !important; }
details a { color: #7dd3fc; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  padding: 1.5rem;
}

h1 {
  margin: 0;
  font-size: clamp(1.6rem, 2.2vw, 2.3rem);
  text-align: center;
}

.layout {
  width: min(100%, 1080px);
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(300px, 2fr);
  gap: 1.5rem;
  align-items: start;
  background: rgba(15, 24, 34, 0.75);
  border-radius: 18px;
  padding: 1.5rem;
  box-shadow: 0 22px 60px rgba(0, 0, 0, 0.28);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.main-column {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-width: 0;
}

canvas {
  width: 100%;
  height: 260px;
  border-radius: 12px;
  background: #0f172a;
  border: 1px solid rgba(148, 163, 184, 0.2);
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

button,
.home-button {
  padding: 0.6rem 1rem;
  font-size: 0.95rem;
  background: linear-gradient(145deg, #38bdf8, #2563eb);
  color: white;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  text-decoration: none;
}

button:disabled {
  opacity: 0.5;
  cursor: default;
}

button:not(:disabled):hover,
.home-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(56, 189, 248, 0.35);
}

.home-button {
  align-self: flex-start;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  border: none;
}

.stats {
  display: grid;
  gap: 0.4rem;
  font-family: "JetBrains Mono", Consolas, monospace;
  background: rgba(15, 23, 42, 0.6);
  padding: 1rem;
  border-radius: 12px;
  border: 1px solid rgba(148, 163, 184, 0.12);
}

.legend {
  font-size: 0.85rem;
  line-height: 1.5;
  color: rgba(226, 232, 240, 0.85);
}

.chart {
  width: 100%;
  height: 160px;
  border-radius: 12px;
  border: 1px solid rgba(148, 163, 184, 0.12);
  background: #0f172a;
}

.panel {
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid rgba(148, 163, 184, 0.12);
  border-radius: 14px;
  padding: 1rem;
  display: grid;
  gap: 0.6rem;
}

.panel-title {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.panel .network {
  width: 100%;
  height: 300px;
  background: #0f172a;
  border-radius: 12px;
  border: 1px solid rgba(148, 163, 184, 0.18);
}

.network-source { margin: 0; padding: 6px 10px; border-left: 3px solid #64748b; background: #17243a; color: #cbd5e1; font-size: 0.82rem; }
.network-source[data-live="true"] { border-color: #4ade80; color: #bbf7d0; }
.network { cursor: crosshair; }
.weight-legend { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 12px; font-size: 0.75rem; color: #b8c7da; }
.weight-legend > span { display: inline-flex; align-items: center; gap: 5px; }
.positive-weight { color: #7dd3fc; }
.negative-weight { color: #fda4af; }
.weight-swatch { display: inline-block; width: 22px; border-top-style: solid; border-top-color: #b8c7da; }
.weight-thin { border-top-width: 0.7px; }
.weight-medium { border-top-width: 2.7px; }
.weight-thick { border-top-width: 4.7px; }
.connection-detail { border: 1px solid #3b4e69; border-radius: 9px; padding: 10px 12px; background: #0d1729; }
.connection-heading { min-height: 30px; display: flex; justify-content: space-between; align-items: center; gap: 8px; color: #e2e8f0; font-size: 0.82rem; }
.connection-heading button { padding: 5px 8px; font-size: 0.75rem; flex-shrink: 0; }
.weight-values { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin: 8px 0 0; }
.weight-values dt { font-size: 0.73rem; }
.weight-values dd { font-family: Consolas, monospace; font-size: 0.94rem; margin-top: 3px; }
.weight-values .positive-weight, .weight-values .negative-weight { font-weight: 600; }

.surface-jump { color: #7dd3fc; font-size: 0.84rem; text-underline-offset: 3px; }
.surface-panel { grid-column: 1 / -1; gap: 14px; scroll-margin-top: 16px; }
.surface-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 18px; }
.surface-heading h2 { margin-bottom: 8px; }
.surface-heading button { flex-shrink: 0; }
.slice-controls { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 32px; }
.slice-controls label { display: flex; justify-content: space-between; gap: 12px; font-size: 0.85rem; }
.slice-controls output { color: #7dd3fc; font-variant-numeric: tabular-nums; }
.slice-controls input { width: 100%; accent-color: #38bdf8; min-height: 32px; margin: 5px 0 0; }
.surface-plots { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; }
.surface-plots figure { margin: 0; min-width: 0; }
.surface-plots figcaption { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 5px; font-size: 0.85rem; color: #e2e8f0; margin-bottom: 8px; }
.surface-plots figcaption span + span { font-size: 0.77rem; color: #a6b8ce; }
.surface-plots .decision-surface { display: block; width: 100%; height: 340px; cursor: crosshair; }
.surface-footer { display: flex; justify-content: space-between; flex-wrap: wrap; align-items: center; gap: 14px; }
.surface-key { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; font-size: 0.76rem; color: #cbd5e1; }
.surface-key i { display: inline-block; width: 90px; height: 10px; background: linear-gradient(90deg, #fb7185, #64748b, #38bdf8); border-radius: 3px; }
.boundary-key { padding-left: 8px; color: #f1f5f9; }
.surface-view { display: flex; flex-wrap: wrap; gap: 8px; }
.surface-view button { padding: 7px 10px; font-size: 0.8rem; min-height: 36px; }
.surface-probe { padding: 12px; border: 1px solid #3b4e69; border-radius: 8px; display: flex; flex-wrap: wrap; gap: 8px 24px; font-size: 0.85rem; color: #cbd5e1; }
.surface-probe strong { color: #7dd3fc; font-variant-numeric: tabular-nums; }

.legend.small {
  font-size: 0.78rem;
  color: rgba(226, 232, 240, 0.7);
}

@media (max-width: 860px) {
  .layout {
    grid-template-columns: 1fr;
  }
  canvas {
    height: 220px;
  }
}

@media (max-width: 480px) {
  body { padding: 14px; gap: 18px; }
  .layout { padding: 14px; gap: 22px; border-radius: 12px; }
  .state-grid { grid-template-columns: repeat(2, 1fr); }
  .panel { padding: 12px; }
  .panel .network { height: 300px; }
  h1 { font-size: 1.5rem; }
  #status { min-height: 0; }
}

@media (max-width: 680px) {
  .surface-heading { flex-direction: column; gap: 12px; }
  .slice-controls, .surface-plots { grid-template-columns: 1fr; }
  .slice-controls { gap: 8px; }
  .surface-plots .decision-surface { height: 300px; }
}

@media (prefers-reduced-motion: reduce) {
  button, .home-button { transition: none; }
}