:root {
  --bg-app: #07090d;
  --bg-surface: #141820;
  --bg-surface-alt: #1b212c;
  --text-primary: #f4f7fb;
  --text-secondary: #a6afbc;
  --text-muted: #6b7280;
  --brand: #cbff1a;
  --brand-dim: #9fd10f;
  --border-subtle: #252b35;
  --danger: #ff5c5c;
  --info: #4fb0ff;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 999px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-6: 24px;
  --sp-8: 32px;
  --font: "Segoe UI", "Inter", -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg-app);
  color: var(--text-primary);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body {
  min-height: 100vh;
  background-image:
    radial-gradient(circle at 15% 0%, rgba(203, 255, 26, 0.06), transparent 40%),
    radial-gradient(circle at 85% 10%, rgba(79, 176, 255, 0.05), transparent 35%);
}

a { color: inherit; }

.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: var(--sp-6) var(--sp-4) 80px;
}

/* ---------- Header ---------- */
.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-4);
  padding-bottom: var(--sp-6);
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: var(--sp-6);
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand .logo {
  font-size: 30px;
  font-weight: 900;
  letter-spacing: 0.5px;
  color: var(--brand);
  text-transform: uppercase;
  line-height: 1.1;
}

.brand .sub {
  color: var(--text-secondary);
  font-size: 14px;
}

.meta-badges {
  display: flex;
  gap: var(--sp-2);
  flex-wrap: wrap;
  align-items: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
}

.badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--brand);
}

/* ---------- Graph (embedded per tab) ---------- */
.graph-solo {
  max-width: 700px;
  margin: 0 auto var(--sp-6);
}

.graph-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--sp-4);
  min-width: 0;
  overflow: hidden;
}

.graph-card h3 {
  margin: 0 0 4px;
  font-size: 15px;
  color: var(--text-primary);
}

.graph-card .graph-desc {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: var(--sp-3);
}

.graph-card svg {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  min-width: 0;
}

.gnode-html {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 4px 10px;
  font-family: var(--font);
  box-sizing: border-box;
}

.gnode-title {
  font-weight: 800;
  font-size: 12.5px;
  color: var(--text-primary);
  line-height: 1.25;
}

.gnode-sub {
  font-size: 10.5px;
  color: var(--text-secondary);
  line-height: 1.3;
  margin-top: 3px;
}

.graph-legend {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: var(--sp-3);
  font-size: 11px;
  color: var(--text-secondary);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.legend-swatch {
  width: 18px;
  height: 0;
  border-top: 2px solid;
  display: inline-block;
}

.legend-swatch.dashed {
  border-top-style: dashed;
}

/* ---------- Tabs ---------- */
.tabs {
  display: flex;
  gap: var(--sp-2);
  margin-bottom: var(--sp-6);
  flex-wrap: wrap;
}

.tab-btn {
  appearance: none;
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  color: var(--text-secondary);
  font-family: var(--font);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.3px;
  text-transform: uppercase;
  padding: 12px 20px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  align-items: center;
  gap: 8px;
}

.tab-btn:hover {
  border-color: var(--brand-dim);
  color: var(--text-primary);
}

.tab-btn.active {
  background: var(--brand);
  border-color: var(--brand);
  color: #0a0e14;
}

.tab-panel {
  display: none;
  animation: fadeIn 0.25s ease;
}

.tab-panel.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Section ---------- */
.section-intro {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.6;
  max-width: 860px;
  margin-bottom: var(--sp-6);
}

.section-intro strong {
  color: var(--text-primary);
}

h2.section-title {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin: var(--sp-8) 0 var(--sp-4);
  display: flex;
  align-items: center;
  gap: 10px;
}

h2.section-title::before {
  content: "";
  width: 4px;
  height: 16px;
  background: var(--brand);
  border-radius: 2px;
}

/* ---------- Flow diagram ---------- */
.flow {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.flow-row {
  display: flex;
  gap: var(--sp-4);
  align-items: stretch;
  flex-wrap: wrap;
  justify-content: center;
}

.flow-node {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--sp-4);
  flex: 1 1 220px;
  min-width: 200px;
  position: relative;
}

.flow-node.accent {
  border-color: var(--brand-dim);
  box-shadow: 0 0 0 1px rgba(203, 255, 26, 0.15) inset;
}

.flow-node .kicker {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--brand);
  margin-bottom: 6px;
  display: block;
}

.flow-node h3 {
  margin: 0 0 6px;
  font-size: 16px;
  color: var(--text-primary);
}

.flow-node p {
  margin: 0;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.flow-node .tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: var(--sp-3);
}

.tag {
  font-size: 11px;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: var(--radius-pill);
  background: var(--bg-surface-alt);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.tag.lime { color: #0a0e14; background: var(--brand); border-color: var(--brand); }
.tag.blue { color: var(--info); border-color: rgba(79,176,255,0.4); }
.tag.red { color: var(--danger); border-color: rgba(255,92,92,0.4); }

.arrow-down {
  display: flex;
  justify-content: center;
  padding: 10px 0;
  color: var(--text-muted);
}

.arrow-down svg { display: block; }

/* branch connector for provider rows */
.branch-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.branch-line {
  width: 2px;
  height: 20px;
  background: var(--border-subtle);
}

/* ---------- Tool grid ---------- */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--sp-3);
}

.tool-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--sp-3) var(--sp-4);
}

.tool-card .name {
  font-family: "SF Mono", "Courier New", monospace;
  font-size: 13px;
  color: var(--brand);
  font-weight: 700;
  display: block;
  margin-bottom: 4px;
}

.tool-card .desc {
  font-size: 12.5px;
  color: var(--text-secondary);
  line-height: 1.45;
}

.tool-group-label {
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-primary);
  margin: var(--sp-4) 0 var(--sp-2);
}

/* ---------- Note / caveat box ---------- */
.note {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-left: 3px solid var(--brand);
  border-radius: var(--radius-md);
  padding: var(--sp-4);
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-top: var(--sp-4);
}

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

.note.warn { border-left-color: var(--danger); }

/* ---------- Provider row ---------- */
.provider-row {
  display: flex;
  gap: var(--sp-4);
  flex-wrap: wrap;
  justify-content: center;
}

.provider-card {
  flex: 1 1 180px;
  min-width: 160px;
  text-align: center;
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--sp-3);
}

.provider-card .pnum {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--brand);
  color: #0a0e14;
  font-size: 11px;
  font-weight: 800;
  margin-bottom: 6px;
}

.provider-card .pname {
  font-weight: 700;
  font-size: 14px;
}

.provider-card .pmodel {
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* ---------- Footer ---------- */
footer {
  margin-top: var(--sp-8);
  padding-top: var(--sp-4);
  border-top: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 12px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-2);
}

@media (max-width: 600px) {
  .brand .logo { font-size: 24px; }
  h2.section-title { margin-top: var(--sp-6); }
}