:root {
  --bg: #091310;
  --panel: #11221d;
  --panel-2: #162e27;
  --text: #eef8f4;
  --muted: #9eb7ad;
  --accent: #26c6a3;
  --warn: #f1c46b;
  --line: #28483e;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: radial-gradient(circle at 15% 0, #15382e 0, transparent 42%), var(--bg);
  color: var(--text);
}

main { max-width: 1180px; margin: auto; padding: 36px 24px 72px; }

.top-nav {
  align-items: center;
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  margin-bottom: 28px;
  padding-bottom: 14px;
}

.top-nav a { font-size: .82rem; font-weight: 700; text-decoration: none; }
.top-nav .brand { color: var(--text); font-size: 1rem; }
.top-nav a[aria-current="page"] { color: var(--text); }
.nav-actions, .language-switch { align-items: center; display: flex; gap: 12px; }
.language-switch { border: 1px solid var(--line); border-radius: 999px; gap: 0; padding: 2px; }
.language-switch a { border-radius: 999px; color: var(--muted); padding: 5px 8px; }
.language-switch a[aria-current="page"] { background: var(--accent); color: var(--bg); }
.score-panel + .score-panel { margin-top: 12px; }
.score-panel > h3 { color: var(--accent); margin-bottom: 12px; }

header {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: end;
  border-bottom: 1px solid var(--line);
  padding-bottom: 24px;
}

.eyebrow, .meta {
  color: var(--accent);
  font-size: .76rem;
  letter-spacing: .12em;
  text-transform: uppercase;
}

h1 { font-size: clamp(2rem, 6vw, 4.8rem); line-height: .95; margin: .35rem 0 0; max-width: 850px; }
h2 { font-size: 1rem; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin: 34px 0 14px; }
h3 { margin: 0; font-size: 1rem; }

.description, .narrative, .section-intro {
  color: var(--muted);
  line-height: 1.6;
  max-width: 800px;
}

.section-intro { margin: -4px 0 16px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; }

.card, .panel {
  background: linear-gradient(145deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
}

.card { display: flex; flex-direction: column; min-height: 230px; }
.value { font-size: 2rem; font-weight: 700; margin: .45rem 0; }
.label { color: var(--muted); font-size: .85rem; }
.chips { display: flex; gap: 6px; flex-wrap: wrap; }

.chip {
  font-size: .72rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 8px;
  color: var(--muted);
}

.chip.provisional { color: var(--warn); border-color: #795f2d; }
.card-footer { margin-top: auto; padding-top: 16px; }
.card-source { border-top: 1px solid var(--line); color: var(--muted); display: flex; flex-direction: column; font-size: .72rem; gap: 4px; line-height: 1.35; padding-top: 12px; }
.card-source strong { color: var(--text); font-size: .68rem; letter-spacing: .06em; text-transform: uppercase; }
.card-source a { width: fit-content; }
.help { padding-top: 14px; }
.help summary { color: var(--accent); cursor: pointer; font-size: .78rem; font-weight: 650; }
.help summary:hover, .help summary:focus-visible { color: var(--text); }
.help[open] summary { margin-bottom: 10px; }

.help-body {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .78rem;
  line-height: 1.5;
  padding-top: 10px;
}

.help-body p { margin: 0 0 9px; }
.help-body strong { color: var(--text); }
.method { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .7rem; }

.bar-item { padding: 12px 0; border-bottom: 1px solid var(--line); }
.bar-item:first-child { padding-top: 0; }
.bar-item:last-child { border-bottom: 0; padding-bottom: 0; }

.bar-row {
  display: grid;
  grid-template-columns: minmax(180px, 1fr) 3fr 56px;
  gap: 12px;
  align-items: center;
}

.bar-label { font-weight: 600; }
.bar { height: 9px; border-radius: 99px; background: #203d34; overflow: hidden; }
.bar span { height: 100%; display: block; background: var(--accent); }
.bar-score { text-align: right; font-variant-numeric: tabular-nums; }
.component-help { margin: 8px 0 0; }
.component-help summary { color: var(--muted); }

.glossary { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1px; margin: 0; }
.glossary div { padding: 14px; background: rgba(255, 255, 255, .018); }
.glossary dt { color: var(--text); font-weight: 700; margin-bottom: 6px; }
.glossary dd { color: var(--muted); line-height: 1.5; margin: 0; font-size: .84rem; }

a { color: var(--accent); }
footer { margin-top: 42px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: .82rem; }
.error { color: #ffb7ad; }
.loading { color: var(--muted); }

.methods-header { align-items: start; }
.methods-header h1 { max-width: 760px; }
.contents { display: flex; flex-wrap: wrap; gap: 8px; margin: 26px 0 48px; }
.contents a { border: 1px solid var(--line); border-radius: 999px; padding: 8px 12px; text-decoration: none; }
.doc-section { border-top: 1px solid var(--line); padding: 44px 0 20px; scroll-margin-top: 20px; }
.doc-section > h2 { color: var(--text); font-size: clamp(1.8rem, 4vw, 3rem); letter-spacing: -.02em; margin: 8px 0 14px; text-transform: none; }
.section-lead { color: var(--muted); font-size: 1.02rem; line-height: 1.7; max-width: 850px; }
.method-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 12px; margin: 22px 0 30px; }
.formula-grid { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.formula { background: #0b1915; border-left: 3px solid var(--accent); border-radius: 6px; color: var(--text); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; line-height: 1.55; padding: 12px; }
.formula strong { display: block; font-family: Inter, ui-sans-serif, system-ui, sans-serif; margin-bottom: 6px; }
.method-value { font-size: 3rem; font-weight: 800; margin: 8px 0; }
.table-wrap { overflow-x: auto; margin: 18px 0 28px; }
table { border-collapse: collapse; min-width: 820px; width: 100%; }
th, td { border-bottom: 1px solid var(--line); padding: 12px 10px; text-align: left; vertical-align: top; }
th { color: var(--muted); font-size: .72rem; letter-spacing: .08em; text-transform: uppercase; }
td { font-size: .84rem; }
td small { color: var(--muted); display: block; line-height: 1.45; margin-top: 5px; }
.missing { color: var(--warn); }
.methods-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(330px, 1fr)); gap: 12px; margin-top: 24px; }
.method-card, .source-card { background: linear-gradient(145deg, var(--panel-2), var(--panel)); border: 1px solid var(--line); border-radius: 14px; padding: 20px; }
.method-card p, .source-card p, .method-section p { color: var(--muted); line-height: 1.55; }
.method-card strong, .source-card strong { color: var(--text); }
.method-key { color: var(--accent) !important; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .72rem; }
.method-card .caveat, .caveat { border-left: 3px solid var(--warn); color: var(--muted); line-height: 1.6; padding-left: 12px; }
.method-section { margin-top: 18px; }
.source-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 12px; margin: 24px 0; }
.limitations { color: var(--muted); line-height: 1.7; margin: 0; padding-left: 22px; }
.limitations li + li { margin-top: 9px; }

@media (max-width: 620px) {
  main { padding: 24px 16px; }
  .top-nav { align-items: flex-start; gap: 16px; }
  .top-nav a:last-child { text-align: right; }
  header { display: block; }
  .meta { margin-top: 16px; }
  .card { min-height: 0; }
  .bar-row { grid-template-columns: 1fr; gap: 8px; }
  .bar-score { text-align: right; }
  .value { font-size: 1.65rem; }
}