:root {
  --bg: #0f1115;
  --panel: #161a22;
  --panel-2: #1d222c;
  --border: #2a3140;
  --text: #e6e9ef;
  --muted: #9aa3b2;
  --accent: #6aa9ff;
  --accent-2: #818cf8;
  --good: #4ade80;
  --bad: #f87171;
  --warn: #fbbf24;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-size: 14px;
}

header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  padding: 24px 32px 18px;
  border-bottom: 1px solid var(--border);
}
header .hero { flex: 1; min-width: 0; }
header h1 { margin: 0 0 4px; font-size: 22px; }
header p { margin: 0; color: var(--muted); font-size: 13px; max-width: 1000px; }

.gh-button {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.12s ease;
}
.gh-button:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--panel);
}
.gh-button svg { display: block; }

@media (max-width: 720px) {
  header { flex-direction: column; align-items: stretch; }
  .gh-button { align-self: flex-start; }
}

.about-section {
  padding: 18px 32px 0;
  max-width: 1480px;
  margin: 0 auto;
}
.about-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 22px;
}
.about-card > summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  color: var(--text);
  padding: 4px 0;
  list-style: none;
}
.about-card > summary::-webkit-details-marker { display: none; }
.about-card > summary::before {
  content: "▸";
  display: inline-block;
  margin-right: 8px;
  color: var(--muted);
  transition: transform 0.15s ease;
}
.about-card[open] > summary::before { transform: rotate(90deg); }
.about-card > summary:hover { color: var(--accent); }
.about-card p {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}
.about-card p strong { color: var(--text); }
.about-card code {
  background: var(--panel-2);
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 12px;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color: var(--text);
}
.about-card a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px dotted var(--accent);
}
.about-card a:hover { color: var(--accent-2); border-bottom-style: solid; }

.about-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-top: 14px;
  padding: 12px 14px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 12px;
  color: var(--muted);
}
.about-metrics strong { color: var(--text); font-weight: 600; }

.about-stack {
  margin-top: 14px !important;
}

.about-disclaimer {
  margin-top: 14px;
  padding: 12px 14px;
  background: rgba(251, 191, 36, 0.08);
  border: 1px solid rgba(251, 191, 36, 0.35);
  border-radius: 8px;
  color: var(--text);
  font-size: 12.5px;
  line-height: 1.55;
}
.about-disclaimer strong { color: var(--warn); }

nav.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 14px 32px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
nav.tabs button {
  background: var(--panel-2);
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 7px 14px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.12s ease;
}
nav.tabs button:hover { color: var(--text); border-color: var(--accent); }
nav.tabs button.active {
  background: var(--accent);
  color: #0f1115;
  border-color: var(--accent);
}

main {
  padding: 24px 32px 64px;
  max-width: 1480px;
  margin: 0 auto;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 22px 26px;
  margin-bottom: 24px;
}
.card h2 { margin: 0 0 6px; font-size: 18px; }
.card h3 { margin: 18px 0 8px; font-size: 14px; color: var(--text); }
.card p.muted { margin: 0 0 16px; }

.muted { color: var(--muted); font-size: 13px; }
.muted.small { font-size: 12px; margin: 6px 0 0; }

.form-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-end;
}
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px 14px;
  align-items: end;
}
.form-grid button, .form-row button { grid-column: auto; }

.field { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.field label { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
.field input, .field select {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 7px 10px;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}
.field input:focus, .field select:focus {
  outline: none;
  border-color: var(--accent);
}

button {
  background: var(--accent);
  color: #0f1115;
  border: 0;
  border-radius: 6px;
  padding: 9px 16px;
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  height: 34px;
  align-self: end;
}
button:hover { filter: brightness(1.1); }
button:disabled { background: var(--border); color: var(--muted); cursor: not-allowed; filter: none; }

.status {
  min-height: 18px;
  font-size: 12px;
  color: var(--muted);
  margin: 12px 0 4px;
}
.status.error { color: var(--bad); }
.status.ok { color: var(--good); }

.stats, .kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 8px;
  margin: 14px 0;
}
.kpi {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
}
.kpi .k { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
.kpi .v { font-size: 18px; font-weight: 600; font-variant-numeric: tabular-nums; margin-top: 2px; }
.kpi .v.good { color: var(--good); }
.kpi .v.bad { color: var(--bad); }
.kpi .v.warn { color: var(--warn); }

.plot {
  margin-top: 14px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  min-height: 60px;
}

.result-block {
  margin-top: 14px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  font-size: 13px;
}
.result-block table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.result-block th, .result-block td { padding: 5px 8px; text-align: right; border-bottom: 1px solid var(--border); }
.result-block th:first-child, .result-block td:first-child { text-align: left; color: var(--muted); }
.result-block thead th { color: var(--muted); font-weight: 500; }
.result-block .badge { display: inline-block; padding: 3px 8px; border-radius: 4px; background: var(--panel); border: 1px solid var(--border); margin-right: 8px; font-size: 12px; }

.toggle-row { display: flex; gap: 14px; margin: 12px 0 4px; }
.toggle { color: var(--muted); font-size: 12px; cursor: pointer; }
.toggle input { margin-right: 4px; }

hr { border: 0; border-top: 1px solid var(--border); margin: 20px 0; }

details.subcard {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  margin-top: 14px;
}
details.subcard > summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  color: var(--text);
}
details.subcard[open] > summary { margin-bottom: 12px; }

footer {
  border-top: 1px solid var(--border);
  padding: 18px 32px;
  text-align: center;
}

@media (max-width: 760px) {
  header, nav.tabs, main, footer { padding-left: 16px; padding-right: 16px; }
  .form-row, .form-grid { grid-template-columns: 1fr; }
}