:root {
  --babson: #006747;
  --babson-tint: #e6f0ec;
  --ink: #0f1419;
  --ink-2: #1f2933;
  --muted: #5a6470;
  --muted-2: #8a939c;
  --line: #e6e8eb;
  --line-strong: #d1d5da;
  --bg: #ffffff;
  --bg-2: #fafbfc;
  --bg-3: #f4f6f8;
  --accent-openai: #10a37f;
  --accent-anthropic: #c66a3f;
  --accent-google: #4285f4;
  --rail-w: 240px;
  --shadow-sm: 0 1px 2px rgba(15,20,25,0.04);
  --shadow-md: 0 1px 3px rgba(15,20,25,0.06), 0 1px 2px rgba(15,20,25,0.04);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--ink);
  background: var(--bg-2);
  font-size: 14px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
.mono { font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace; font-variant-numeric: tabular-nums; }

a { color: inherit; }
sup { font-size: 0.65em; color: var(--muted); font-weight: 500; padding: 0 1px; }

/* TOP STRIP */
.topstrip {
  background: var(--ink);
  color: #f1f3f5;
  border-bottom: 1px solid #000;
}
.topstrip-inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 8px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
}
.back {
  color: #c8cdd3;
  text-decoration: none;
  letter-spacing: 0.02em;
}
.back:hover { color: #fff; }
.meta-pills { display: flex; gap: 8px; }
.pill {
  border: 1px solid rgba(255,255,255,0.18);
  padding: 2px 8px;
  border-radius: 3px;
  color: #c8cdd3;
  letter-spacing: 0.02em;
}
.pill.ok {
  background: rgba(0,153,90,0.18);
  color: #6fe5b1;
  border-color: rgba(111,229,177,0.3);
}

/* SHELL */
.shell {
  display: grid;
  grid-template-columns: var(--rail-w) 1fr;
  max-width: 1440px;
  margin: 0 auto;
  min-height: calc(100vh - 36px);
  background: var(--bg);
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
}

/* SIDE RAIL */
.rail {
  border-right: 1px solid var(--line);
  background: var(--bg-2);
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
}
.rail-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 18px;
}
.rail-mark {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  background: var(--babson);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 16px;
  font-family: 'JetBrains Mono', monospace;
}
.rail-title { font-weight: 600; font-size: 13px; color: var(--ink); }
.rail-sub { font-size: 11px; color: var(--muted); font-family: 'JetBrains Mono', monospace; }
.rail-section {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted-2);
  padding: 0 8px;
  margin-bottom: 4px;
}
.rail-nav { display: flex; flex-direction: column; gap: 1px; flex: 1; }
.rail-link {
  display: block;
  padding: 6px 8px;
  border-radius: 4px;
  text-decoration: none;
  color: var(--ink-2);
  font-size: 13px;
  font-weight: 500;
}
.rail-link:hover { background: var(--bg-3); }
.rail-link.active {
  background: var(--babson-tint);
  color: var(--babson);
  font-weight: 600;
}
.rail-foot {
  border-top: 1px solid var(--line);
  padding-top: 14px;
  margin-top: 14px;
}
.rail-foot-line {
  font-size: 12px;
  color: var(--muted);
  padding: 1px 8px;
  font-family: 'JetBrains Mono', monospace;
}

/* MAIN */
.main { padding: 0; }

/* STICKY HEADER */
.stickyhdr {
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgba(255,255,255,0.92);
  backdrop-filter: saturate(180%) blur(8px);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
  padding: 24px 36px 20px;
}
.hdr-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
}
.kicker {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--babson);
  font-weight: 600;
  margin-bottom: 6px;
}
h1 {
  margin: 0 0 6px;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.012em;
  color: var(--ink);
  line-height: 1.2;
}
.lede {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
  max-width: 720px;
}
.hdr-tags { display: flex; gap: 6px; flex-shrink: 0; }
.tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 3px;
  background: var(--bg-3);
  color: var(--ink-2);
  border: 1px solid var(--line);
}

/* KPI */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  border-bottom: 1px solid var(--line);
}
.kpi {
  padding: 20px 24px;
  border-right: 1px solid var(--line);
  background: var(--bg);
  position: relative;
}
.kpi:last-child { border-right: none; }
.kpi.accent {
  background: linear-gradient(180deg, var(--babson-tint) 0%, #fff 100%);
}
.kpi.accent::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: var(--babson);
}
.kpi-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.kpi-tag {
  font-size: 9px;
  background: var(--babson);
  color: #fff;
  padding: 1px 5px;
  border-radius: 2px;
  letter-spacing: 0.04em;
}
.kpi-value {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}
.kpi-value.mono-val { font-family: 'JetBrains Mono', monospace; font-size: 26px; }
.kpi-foot {
  font-size: 12px;
  color: var(--muted);
  margin-top: 6px;
}

/* CALLOUT */
.callout {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin: 24px 36px 0;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--babson);
  border-radius: 4px;
  background: var(--bg-2);
  font-size: 13px;
  color: var(--ink-2);
}
.callout-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--babson);
  margin-top: 6px;
  flex-shrink: 0;
}

/* SECTIONS */
.section {
  padding: 40px 36px 8px;
  scroll-margin-top: 90px;
}
.section-hdr {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}
.section h2 {
  margin: 0 0 4px;
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.section-sub {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
  max-width: 640px;
}

/* TABS */
.tabs {
  display: inline-flex;
  background: var(--bg-3);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 2px;
  gap: 0;
}
.tab {
  border: 0;
  background: transparent;
  padding: 5px 12px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  font-weight: 500;
  color: var(--muted);
  cursor: pointer;
  border-radius: 4px;
  letter-spacing: 0.02em;
}
.tab:hover { color: var(--ink); }
.tab.active {
  background: var(--bg);
  color: var(--ink);
  box-shadow: var(--shadow-sm);
}

/* PROVIDER CARDS */
.provider-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.provider {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 18px 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: border-color 0.15s, box-shadow 0.15s, opacity 0.2s;
}
.provider:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-md);
}
.provider.dimmed { opacity: 0.32; }
.provider-hdr {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
}
.provider-id { display: flex; gap: 10px; align-items: center; }
.dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  display: inline-block;
  margin-right: 6px;
  vertical-align: middle;
}
.provider-id .dot { margin: 0; width: 10px; height: 10px; flex-shrink: 0; }
.dot-openai { background: var(--accent-openai); }
.dot-anthropic { background: var(--accent-anthropic); }
.dot-google { background: var(--accent-google); }
.provider-name { font-weight: 600; font-size: 15px; }
.provider-flag {
  font-size: 11px;
  color: var(--muted);
  margin-top: 1px;
}
.strength {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px;
  background: var(--babson-tint);
  color: var(--babson);
  padding: 3px 7px;
  border-radius: 3px;
  letter-spacing: 0.02em;
  white-space: nowrap;
  font-weight: 600;
}
.provider-pos {
  font-size: 13px;
  color: var(--ink-2);
  margin: 0;
  line-height: 1.55;
}
.provider-stats {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.provider-stats > div { display: flex; flex-direction: column; gap: 2px; }
.provider-stats dt {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted-2);
}
.provider-stats dd {
  margin: 0;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
}
.provider-stats dd .unit {
  font-weight: 400;
  color: var(--muted);
  font-size: 11px;
}
.provider-link {
  font-size: 12px;
  color: var(--babson);
  text-decoration: none;
  font-weight: 500;
}
.provider-link:hover { text-decoration: underline; }

/* COST GRID */
.cost-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 0.8fr;
  gap: 14px;
}
.card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 18px;
  display: flex;
  flex-direction: column;
}
.card-hdr { margin-bottom: 12px; }
.card-title { font-weight: 600; font-size: 14px; }
.card-sub { font-size: 11px; color: var(--muted); margin-top: 2px; }
.card-foot {
  margin-top: auto;
  padding-top: 12px;
  font-size: 11px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  margin-top: 12px;
}
.chart-card .chart-wrap { padding: 4px 0; flex: 1; min-height: 220px; position: relative; }

.datatable {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.datatable th, .datatable td {
  text-align: left;
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
}
.datatable th {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
  padding-bottom: 6px;
}
.datatable td.mono { font-size: 13px; }
.datatable td.strong { font-weight: 700; color: var(--ink); }
.datatable tr:last-child td { border-bottom: none; }

.benchmark {
  background: linear-gradient(180deg, #fff 0%, var(--babson-tint) 100%);
  border-color: var(--babson);
  border-width: 1px;
}
.benchmark-big {
  font-size: 44px;
  font-weight: 700;
  color: var(--babson);
  letter-spacing: -0.02em;
  margin: 6px 0 8px;
  line-height: 1;
}
.benchmark-line {
  font-size: 12.5px;
  color: var(--ink-2);
  line-height: 1.5;
}
.benchmark-foot {
  margin-top: 14px;
  padding-top: 10px;
  border-top: 1px solid rgba(0,103,71,0.15);
  font-size: 11px;
  color: var(--babson);
  font-weight: 600;
}

/* MATRIX */
.matrix-wrap { padding: 0; overflow: hidden; }
.matrix {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.matrix thead th {
  background: var(--bg-2);
  font-size: 11.5px;
  font-weight: 600;
  text-align: left;
  padding: 12px 14px;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.matrix .th-sub {
  display: block;
  font-size: 10px;
  color: var(--muted);
  font-weight: 400;
  margin-top: 2px;
  letter-spacing: 0.02em;
}
.matrix tbody td, .matrix tbody th {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  text-align: left;
}
.matrix tbody tr:last-child td, .matrix tbody tr:last-child th { border-bottom: none; }
.matrix-rowhead {
  background: var(--bg-2);
  font-weight: 600;
  font-size: 12.5px;
  width: 140px;
  white-space: nowrap;
  border-right: 1px solid var(--line);
}
.cell-inst {
  font-size: 12.5px;
  color: var(--ink-2);
  margin-bottom: 4px;
  line-height: 1.4;
}
.cell-inst:last-child { margin-bottom: 0; }
.cell-empty { color: var(--muted-2); font-family: 'JetBrains Mono', monospace; font-size: 12px; }
.matrix-foot {
  padding: 10px 14px;
  font-size: 11px;
  color: var(--muted);
  background: var(--bg-2);
  border-top: 1px solid var(--line);
}

.legend {
  display: flex;
  gap: 16px;
  font-size: 11.5px;
  color: var(--muted);
}
.legend span { display: inline-flex; align-items: center; }

/* REFS */
.refs { padding-bottom: 24px; }
.reflist {
  margin: 0;
  padding-left: 22px;
  font-size: 12.5px;
  color: var(--ink-2);
  columns: 2;
  column-gap: 32px;
  column-rule: 1px solid var(--line);
}
.reflist li {
  margin-bottom: 10px;
  break-inside: avoid;
  line-height: 1.5;
}
.reflist em { color: var(--ink); }
.reflist a {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--babson);
  text-decoration: none;
  word-break: break-all;
}
.reflist a:hover { text-decoration: underline; }

/* FOOTER */
.footer {
  display: flex;
  justify-content: space-between;
  padding: 18px 36px 28px;
  border-top: 1px solid var(--line);
  margin-top: 24px;
  font-size: 11px;
  color: var(--muted);
}

/* ANIMATIONS */
.fade-in {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.fade-in.in {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1100px) {
  .kpi-grid { grid-template-columns: repeat(3, 1fr); }
  .kpi:nth-child(3n) { border-right: none; }
  .kpi { border-bottom: 1px solid var(--line); }
  .cost-grid { grid-template-columns: 1fr 1fr; }
  .benchmark { grid-column: span 2; }
  .provider-grid { grid-template-columns: 1fr; }
  .reflist { columns: 1; }
}
@media (max-width: 820px) {
  .shell { grid-template-columns: 1fr; }
  .rail { display: none; }
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .cost-grid { grid-template-columns: 1fr; }
  .benchmark { grid-column: auto; }
  .stickyhdr, .section, .callout, .footer { padding-left: 20px; padding-right: 20px; }
  .callout { margin-left: 20px; margin-right: 20px; }
  h1 { font-size: 22px; }
  .hdr-row { flex-direction: column; }
}