/* ============================================================
   Design tokens
   Chart colors are the validated reference palette; the dark
   column is the same hues re-stepped for the dark surface, not
   an automatic flip. Both modes passed the palette validator.
   ============================================================ */

:root {
  color-scheme: light;

  --surface-1: #fcfcfb;
  --page: #f9f9f7;
  --text-primary: #0b0b0b;
  --text-secondary: #52514e;
  --text-muted: #898781;
  --gridline: #e1e0d9;
  --axis: #c3c2b7;
  --border: rgba(11, 11, 11, 0.1);

  --series-1: #2a78d6;
  --series-2: #eb6834;
  --series-3: #1baf7a;

  --status-good: #0ca30c;
  --status-warning: #fab219;
  --status-critical: #d03b3b;

  --radius: 10px;
  --maxw: 1080px;

  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.6;
}

@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) {
    color-scheme: dark;

    --surface-1: #1a1a19;
    --page: #0d0d0d;
    --text-primary: #ffffff;
    --text-secondary: #c3c2b7;
    --text-muted: #898781;
    --gridline: #2c2c2a;
    --axis: #383835;
    --border: rgba(255, 255, 255, 0.1);

    --series-1: #3987e5;
    --series-2: #d95926;
    --series-3: #199e70;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --surface-1: #1a1a19;
  --page: #0d0d0d;
  --text-primary: #ffffff;
  --text-secondary: #c3c2b7;
  --text-muted: #898781;
  --gridline: #2c2c2a;
  --axis: #383835;
  --border: rgba(255, 255, 255, 0.1);
  --series-1: #3987e5;
  --series-2: #d95926;
  --series-3: #199e70;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--text-primary);
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9em;
  background: color-mix(in srgb, var(--text-primary) 7%, transparent);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

/* ============================================================ Nav */

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--page) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--text-primary);
}

.brand-mark {
  width: 14px;
  height: 14px;
  border-radius: 4px;
  background: linear-gradient(135deg, var(--series-1), var(--series-2));
}

.nav-links {
  display: flex;
  gap: 0.25rem;
  margin-inline-start: auto;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 0.94rem;
}

.nav-links a:hover {
  background: color-mix(in srgb, var(--text-primary) 6%, transparent);
}

.nav-links a.active {
  background: color-mix(in srgb, var(--series-1) 15%, transparent);
  color: var(--series-1);
  font-weight: 600;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
}

.status-up .status-dot {
  background: var(--status-good);
}

.status-loading .status-dot {
  background: var(--status-warning);
}

.status-down .status-dot {
  background: var(--status-critical);
}

/* ============================================================ Layout */

.main {
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 2rem 1.5rem 4rem;
}

.page h1 {
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  line-height: 1.15;
  margin: 0 0 0.75rem;
  letter-spacing: -0.02em;
}

.lede {
  font-size: 1.08rem;
  color: var(--text-secondary);
  max-width: 68ch;
}

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

/* ============================================================ Home */

.hero {
  padding: 2rem 0 1rem;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.09em;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--series-1);
  margin: 0 0 0.75rem;
}

.hero h1 em {
  font-style: normal;
  background: linear-gradient(100deg, var(--series-1), var(--series-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin-top: 2.5rem;
}

.card {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.card h2 {
  font-size: 1.05rem;
  margin: 0 0 0.5rem;
}

.card p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.94rem;
}

.what-you-get {
  margin-top: 2.5rem;
}

.feature-list {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.feature-list li {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-left: 3px solid var(--series-1);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  color: var(--text-secondary);
  font-size: 0.94rem;
}

/* ============================================================ Buttons */

.btn {
  display: inline-block;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 0.6rem 1.2rem;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  text-decoration: none;
}

.btn-primary {
  background: var(--series-1);
  color: #fff;
}

.btn-primary:hover {
  filter: brightness(1.08);
}

.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text-primary);
}

.btn-ghost:hover {
  background: color-mix(in srgb, var(--text-primary) 6%, transparent);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-small {
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
}

.chip {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
  font-size: 0.8rem;
  cursor: pointer;
  font-family: inherit;
}

.chip:hover {
  background: color-mix(in srgb, var(--text-primary) 6%, transparent);
}

/* ============================================================ Prose / theory */

.page-prose section {
  margin-top: 2.5rem;
}

.page-prose h2 {
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

.page-prose p,
.page-prose li {
  color: var(--text-secondary);
  max-width: 72ch;
}

.page-prose strong {
  color: var(--text-primary);
}

.algo {
  display: grid;
  gap: 0.75rem;
  padding-left: 1.25rem;
}

.callout {
  background: color-mix(in srgb, var(--series-1) 8%, var(--surface-1));
  border-left: 3px solid var(--series-1);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 0.85rem 1rem;
  max-width: 72ch;
}

.lit {
  display: grid;
  gap: 1rem;
  max-width: 72ch;
}

.lit dt {
  font-weight: 700;
  color: var(--text-primary);
}

.lit dd {
  margin: 0.25rem 0 0;
  color: var(--text-secondary);
}

.refs ol {
  color: var(--text-secondary);
  max-width: 72ch;
  font-size: 0.92rem;
}

.refs li {
  margin-bottom: 0.4rem;
}

.page-cta {
  margin-top: 2.5rem;
}

.math-display {
  display: block;
  margin: 1rem 0;
  overflow-x: auto;
}

/* ============================================================ Panels */

.panel {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-top: 1.5rem;
}

.panel h2 {
  margin-top: 0;
  font-size: 1.2rem;
}

.panel-note {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.field {
  display: block;
  margin-bottom: 1rem;
}

.field-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.field-hint {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
}

textarea {
  width: 100%;
  font-family: inherit;
  font-size: 0.95rem;
  padding: 0.7rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--page);
  color: var(--text-primary);
  resize: vertical;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--series-1);
}

.preset-row {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.controls-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
}

.button-row {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}

.busy {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.error-banner {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  background: color-mix(in srgb, var(--status-critical) 12%, transparent);
  border-left: 3px solid var(--status-critical);
  color: var(--text-primary);
  font-size: 0.9rem;
}

.empty-state {
  color: var(--text-secondary);
}

/* ============================================================ Stats */

.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.stat {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  background: var(--page);
}

.stat-emphasis {
  border-color: var(--series-1);
  background: color-mix(in srgb, var(--series-1) 8%, var(--page));
}

.stat-label {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.stat-value {
  display: block;
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-top: 0.15rem;
}

.stat-detail {
  display: block;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.verdict {
  border-radius: var(--radius);
  padding: 0.8rem 1rem;
  font-size: 0.92rem;
  margin-bottom: 1.25rem;
}

.verdict-ok {
  background: color-mix(in srgb, var(--status-good) 10%, transparent);
  border-left: 3px solid var(--status-good);
}

.verdict-warn {
  background: color-mix(in srgb, var(--status-warning) 14%, transparent);
  border-left: 3px solid var(--status-warning);
}

.output-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.output-columns h3 {
  font-size: 0.9rem;
  margin: 0 0 0.4rem;
  color: var(--text-secondary);
}

.output {
  background: var(--page);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem;
  white-space: pre-wrap;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.82rem;
  max-height: 220px;
  overflow-y: auto;
  margin: 0;
}

/* ============================================================ Round strip */

.round-strip {
  display: flex;
  flex-direction: column;
  gap: 3px;
  margin: 1rem 0;
  max-height: 320px;
  overflow-y: auto;
}

.round {
  display: flex;
  align-items: center;
  gap: 3px;
}

.round-index {
  width: 2.2rem;
  font-size: 0.7rem;
  color: var(--text-muted);
  text-align: right;
  padding-right: 0.4rem;
  font-variant-numeric: tabular-nums;
}

.tok {
  width: 15px;
  height: 15px;
  border-radius: 4px;
  animation: pop 0.18s ease-out;
}

.tok-rejected {
  opacity: 0.55;
}

.tok-bonus {
  border-radius: 50%;
}

@keyframes pop {
  from {
    transform: scale(0.4);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

/* ============================================================ Live view */

.live-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1rem 0;
}

@media (max-width: 780px) {
  .live-grid {
    grid-template-columns: 1fr;
  }
}

.live-pane {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  background: var(--page);
}

.live-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.6rem;
}

.live-head h3 {
  margin: 0;
  font-size: 0.92rem;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.live-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--status-good);
  animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.25;
  }
}

.live-metrics {
  font-size: 0.76rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.live-text {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.82rem;
  line-height: 1.65;
  min-height: 8rem;
  max-height: 16rem;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.live-placeholder {
  color: var(--text-muted);
  font-style: italic;
}

.live-chunk {
  animation: fadein 0.25s ease-out;
}

/* speculative bursts get a faint boundary so you can see where each target
   pass committed, without tinting the text itself unreadably */
.live-chunk-spec {
  border-bottom: 2px solid color-mix(in srgb, var(--status-good) 45%, transparent);
  border-radius: 2px;
}

@keyframes fadein {
  from {
    opacity: 0;
    background: color-mix(in srgb, var(--status-good) 30%, transparent);
  }
  to {
    opacity: 1;
    background: transparent;
  }
}

.live-caret {
  display: inline-block;
  width: 7px;
  height: 1em;
  background: var(--series-1);
  vertical-align: text-bottom;
  animation: pulse 0.9s steps(2) infinite;
}

.live-ticker {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 0.75rem;
  padding-top: 0.6rem;
  border-top: 1px solid var(--border);
}

.ticker-round {
  display: inline-flex;
  gap: 2px;
  padding: 2px;
  border: 1px dashed var(--border);
  border-radius: 4px;
}

.ticker-round i {
  width: 8px;
  height: 8px;
  border-radius: 2px;
  display: inline-block;
}

/* ============================================================ Charts */

.chart {
  margin: 0 0 2rem;
}

.chart-head {
  margin-bottom: 0.5rem;
}

.chart-title {
  font-size: 1rem;
  margin: 0 0 0.25rem;
}

.chart-subtitle {
  margin: 0;
  font-size: 0.88rem;
  color: var(--text-secondary);
  max-width: 70ch;
}

.chart-legend {
  list-style: none;
  display: flex;
  gap: 1rem;
  padding: 0;
  margin: 0.6rem 0 0;
  font-size: 0.82rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
}

.chart-legend li {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.legend-swatch {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  display: inline-block;
}

.chart-plot {
  margin-top: 0.75rem;
}

.chart-svg-wrap {
  position: relative;
  overflow-x: auto;
}

.chart-footnote {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0.5rem 0 0;
  max-width: 70ch;
}

.chart-tick {
  font-size: 11px;
  fill: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.chart-axistitle {
  font-size: 11px;
  fill: var(--text-secondary);
}

.chart-directlabel {
  font-size: 11px;
  font-weight: 600;
  fill: var(--text-secondary);
}

.chart-reflabel {
  font-size: 10px;
  fill: var(--text-muted);
}

.chart-tooltip {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem 0.7rem;
  font-size: 0.8rem;
  pointer-events: none;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
}

.chart-tooltip strong {
  display: block;
  margin-bottom: 0.25rem;
}

/* stacked latency bars */

.stack-chart {
  display: grid;
  gap: 0.9rem;
}

.stack-row-head {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.stack-row-total {
  font-variant-numeric: tabular-nums;
}

.stack-track {
  display: flex;
  gap: 2px; /* surface gap between segments */
  height: 30px;
  min-width: 60px;
}

.stack-seg {
  display: flex;
  align-items: center;
  padding-inline: 0.5rem;
  border-radius: 4px;
  overflow: hidden;
  min-width: 3px;
}

.stack-seg-label {
  font-size: 0.72rem;
  color: #fff;
  white-space: nowrap;
  font-weight: 600;
}

/* data table */

.data-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
}

.data-table caption {
  text-align: left;
  color: var(--text-muted);
  font-size: 0.8rem;
  padding-bottom: 0.4rem;
}

.data-table th,
.data-table td {
  text-align: right;
  padding: 0.4rem 0.6rem;
  border-bottom: 1px solid var(--border);
}

.data-table th:first-child,
.data-table td:first-child {
  text-align: left;
}

.data-table th {
  color: var(--text-muted);
  font-weight: 600;
}

/* ============================================================ Responsive */

@media (max-width: 720px) {
  .output-columns {
    grid-template-columns: 1fr;
  }

  .nav-links {
    order: 3;
    width: 100%;
    margin-inline-start: 0;
  }
}