:root {
  color-scheme: dark;
  --bg: #0a0d14;
  --surface: #111422;
  --border: rgba(255, 255, 255, 0.08);
  --text: #f8fbff;
  --muted: rgba(248, 251, 255, 0.7);
  --cyan: #12c2e9;
  --violet: #c471ed;
  --rose: #f64f59;
  --ring: rgba(18, 194, 233, 0.35);
  /* Fixed chart area — must stay px-based so Chart.js does not grow the layout */
  --chart-h: 240px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100dvh;
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(ellipse 80% 50% at 20% 0%, rgba(18, 194, 233, 0.12), transparent 50%),
    radial-gradient(ellipse 70% 40% at 100% 20%, rgba(196, 113, 237, 0.1), transparent 45%),
    linear-gradient(180deg, #0a0d14, #101525 60%, #0a0d14);
  line-height: 1.5;
}

button,
input,
textarea {
  font: inherit;
}

a {
  color: var(--cyan);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: 12px;
  z-index: 10;
  padding: 8px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  text-decoration: none;
  transform: translateY(-200%);
  transition: transform 0.2s;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  padding: 48px 20px 24px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.site-header__inner {
  max-width: 720px;
  margin: 0 auto;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -0.06em;
  line-height: 1.1;
  background: linear-gradient(100deg, var(--cyan), var(--violet), var(--rose));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.tagline {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.65;
}

.layout {
  width: min(1100px, 100% - 32px);
  margin: 0 auto;
  padding: 24px 0 64px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.workspace-tabs {
  display: flex;
  gap: 10px;
}

.workspace-tab {
  cursor: pointer;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 14px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
  font-weight: 600;
}

.workspace-tab.is-active {
  background: linear-gradient(135deg, rgba(18, 194, 233, 0.22), rgba(196, 113, 237, 0.22));
  border-color: rgba(255, 255, 255, 0.16);
}

.workspace-panel {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.workspace-panel[hidden] {
  display: none;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px 22px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
  min-width: 0; /* prevent grid/flex overflow */
}

.panel h2 {
  margin: 0 0 4px;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.panel__sub {
  margin: 0 0 16px;
  font-size: 0.8rem;
  color: var(--muted);
}

.train-form__row {
  display: grid;
  grid-template-columns: 1fr minmax(7rem, 9rem) auto;
  gap: 14px;
  align-items: end;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.field label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

input,
textarea {
  width: 100%;
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  padding: 10px 12px;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

input:focus,
textarea:focus {
  border-color: rgba(18, 194, 233, 0.5);
  box-shadow: 0 0 0 3px var(--ring);
}

.btn {
  cursor: pointer;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 10px 18px;
  font-weight: 700;
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
  white-space: nowrap;
  transition: filter 0.15s, opacity 0.15s;
}

.btn:hover:not(:disabled) {
  filter: brightness(1.1);
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.btn--primary {
  background: linear-gradient(135deg, rgba(18, 194, 233, 0.25), rgba(196, 113, 237, 0.25));
  border-color: rgba(255, 255, 255, 0.12);
}

.status {
  margin: 16px 0 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.metric-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.metric-strip li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 14px;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  min-width: 0;
}

.metric-strip span {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.metric-strip strong {
  font-size: clamp(1.4rem, 3.5vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.1;
}

.log-stream__body {
  margin: 0;
  min-height: 140px;
  max-height: 260px;
  padding: 12px 14px;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.06);
  color: rgba(248, 251, 255, 0.88);
  font-size: 0.78rem;
  line-height: 1.45;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.stage-tester__controls {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.stage-tester__form {
  display: grid;
  gap: 12px;
}

.stage-tester__buttons {
  display: flex;
  gap: 10px;
}

#tester-auto-prompt {
  min-height: 72px;
  resize: vertical;
}

/* Charts: fixed height container — this stops runaway vertical growth */
.charts__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 4px;
}

.chart-tile {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}

.chart-tile__head h3 {
  margin: 0 0 2px;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.chart-tile__head p {
  margin: 0;
  font-size: 0.75rem;
  color: var(--muted);
}

.chart-surface {
  position: relative;
  width: 100%;
  height: var(--chart-h);
  max-height: var(--chart-h);
  min-height: var(--chart-h);
  margin-top: 10px;
  overflow: hidden;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.04);
  flex-shrink: 0;
  contain: layout style;
}

/* Chart.js wraps the canvas; lock all nested layout to the fixed box */
.chart-surface > *,
.chart-surface > div {
  position: relative !important;
  width: 100% !important;
  height: 100% !important;
  max-height: var(--chart-h) !important;
}

.chart-surface canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
  max-width: 100%;
  max-height: var(--chart-h) !important;
}

.meters {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.meter {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.meter > span {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

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

.meter__fill {
  height: 100%;
  width: 0%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
  transition: width 0.2s ease;
}

.meter__fill--danger {
  background: linear-gradient(90deg, var(--violet), var(--rose));
}

.meter strong {
  font-size: 1.2rem;
  font-weight: 700;
}

.chat {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.chat textarea {
  min-height: 100px;
  resize: vertical;
  max-height: 320px;
}

.chat__meta {
  margin: 12px 0 8px;
  font-size: 0.85rem;
  color: var(--muted);
}

.chat__out {
  min-height: 100px;
  padding: 16px 18px;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.06);
  color: rgba(248, 251, 255, 0.9);
  line-height: 1.65;
  overflow: auto;
  max-height: 60dvh;
}

.prose h1,
.prose h2,
.prose h3 {
  margin: 0.75em 0 0.35em;
  letter-spacing: -0.03em;
}

.prose :first-child {
  margin-top: 0;
}

.prose code,
.prose pre {
  color: #c7f7ff;
}

@media (max-width: 800px) {
  .train-form__row {
    grid-template-columns: 1fr;
  }

  .btn {
    justify-self: start;
    width: fit-content;
  }

  .metric-strip,
  .charts__grid,
  .meters {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  :root {
    --chart-h: 200px;
  }
}