:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --ink: #1c2430;
  --muted: #5c6773;
  --line: #e6e9ee;
  --accent: #2b6cff;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(20, 30, 50, .06), 0 6px 20px rgba(20, 30, 50, .06);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Roboto", system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 1040px; margin: 0 auto; padding: 48px 20px 64px; }

/* ---- headers ---- */
.home-header { text-align: center; margin: 8px 0 44px; }
.site-title {
  font-weight: 900;
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  letter-spacing: -.02em;
  margin: 0;
}
.site-tagline { color: var(--muted); margin: .5rem 0 0; }

.kpi-section { margin: 0 0 40px; }
.section-title {
  font-size: .8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
  padding-bottom: 8px;
  margin: 0 0 18px;
}

/* ---- KPI card grid (ex <table> + divide_chunks) ---- */
.kpi-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
}
.kpi-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 8px;
  height: 100%;
  padding: 22px 14px;
  color: inherit;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform .12s ease, box-shadow .12s ease, border-color .12s ease;
}
.kpi-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: #d3dae6;
  text-decoration: none;
}
.kpi-logo { width: 56px; height: 56px; object-fit: contain; }
.kpi-acronym { font-weight: 700; font-size: 1.1rem; letter-spacing: .02em; }
.kpi-longname { font-size: .82rem; color: var(--muted); line-height: 1.3; }

/* ---- KPI detail ---- */
.kpi { max-width: 720px; margin: 0 auto; }
.kpi-back { margin: 0 0 24px; }
.kpi-back a { font-size: .9rem; color: var(--muted); }
.kpi-header { border-bottom: 1px solid var(--line); padding-bottom: 20px; margin-bottom: 24px; }
.kpi-header .kpi-acronym { font-size: 2.6rem; font-weight: 900; margin: 0; letter-spacing: -.01em; }
.kpi-header .kpi-longname { font-size: 1.15rem; color: var(--muted); margin: .2rem 0 0; }
.kpi-domains { margin: 14px 0 0; display: flex; flex-wrap: wrap; gap: 8px; }
.domain-tag {
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  background: #eef3ff;
  color: var(--accent);
  padding: 4px 10px;
  border-radius: 999px;
}
.domain-tag:hover { text-decoration: none; background: #e2ebff; }

.kpi-body h2 { font-size: 1.05rem; font-weight: 700; margin: 34px 0 10px; }
.kpi-body p { margin: 0 0 16px; }
.kpi-formula {
  display: block;
  margin: 24px auto;
  max-width: 100%;
  height: auto;
  padding: 22px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

/* ---- domain index ---- */
.domain-index { list-style: none; padding: 0; max-width: 420px; margin: 0 auto; }
.domain-index li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 18px;
  margin-bottom: 10px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.domain-index .count { color: var(--muted); font-size: .85rem; }

/* ---- footer ---- */
.site-footer {
  margin-top: 56px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  text-align: center;
  color: var(--muted);
  font-size: .85rem;
}