:root {
  --bg: #f7f4ee;
  --surface: #fffdf9;
  --ink: #211d18;
  --muted: #7a7263;
  --line: #e4ddd0;
  --indigo: #2c4a8f;
  --indigo-soft: #e8edf8;
  --crimson: #b0413e;
  --crimson-soft: #f9e9e8;
  --green-bg: #d9efd3;
  --red-bg: #f7dcd8;
  --serif: "Shippori Mincho", "Hiragino Mincho ProN", Georgia, serif;
  --sans: "Noto Sans JP", "Hiragino Kaku Gothic ProN", -apple-system, sans-serif;
  --mono: "JetBrains Mono", "SF Mono", Menlo, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 2;
  font-feature-settings: "palt";
}

/* ---------- nav ---------- */
nav {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.7rem 1.4rem;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
nav .brand { font-family: var(--serif); font-weight: 700; font-size: 1.1rem; letter-spacing: 0.06em; text-decoration: none; color: var(--ink); }
nav .brand small { font-family: var(--mono); font-weight: 400; color: var(--muted); margin-left: 0.6em; font-size: 0.72rem; letter-spacing: 0; }
nav .links { display: flex; gap: 0.9rem; align-items: center; font-size: 0.85rem; }
nav .links a { color: var(--muted); text-decoration: none; white-space: nowrap; }
nav .brand { white-space: nowrap; }
nav .links a:hover { color: var(--indigo); }
nav .lang {
  font-family: var(--mono); font-size: 0.78rem;
  border: 1px solid var(--line); border-radius: 99px;
  padding: 0.18rem 0.75rem; background: var(--surface);
  color: var(--indigo) !important;
}

/* ---------- hero ---------- */
header.hero {
  position: relative; overflow: hidden;
  padding: 7rem 1.4rem 5.5rem;
  text-align: left;
  background:
    radial-gradient(1200px 500px at 80% -10%, var(--indigo-soft) 0%, transparent 60%),
    var(--bg);
}
.hero-inner { max-width: 880px; margin: 0 auto; position: relative; }
.hero .glyph {
  position: absolute; right: -1rem; top: 50%;
  transform: translateY(-54%);
  font-family: var(--serif); font-weight: 700;
  font-size: clamp(14rem, 30vw, 24rem);
  color: var(--indigo); opacity: 0.055;
  user-select: none; pointer-events: none; line-height: 1;
}
.hero h1 {
  font-family: var(--serif); font-weight: 700;
  font-size: clamp(2.6rem, 6vw, 4rem);
  letter-spacing: 0.08em; line-height: 1.25;
}
.hero h1 .accent { color: var(--indigo); }
.hero .tagline { margin-top: 1.4rem; max-width: 40em; font-size: 1.02rem; color: var(--muted); }
.hero .meta { margin-top: 2rem; display: flex; flex-wrap: wrap; gap: 0.6rem; }
.chip {
  font-family: var(--mono); font-size: 0.72rem;
  border: 1px solid var(--line); background: var(--surface);
  border-radius: 99px; padding: 0.28rem 0.8rem; color: var(--muted);
  text-decoration: none;
}
a.chip:hover { border-color: var(--indigo); color: var(--indigo); }

/* ---------- layout ---------- */
main { max-width: 880px; margin: 0 auto; padding: 0 1.4rem 6rem; }
section { margin-top: 5rem; }
.sec-label {
  font-family: var(--mono); font-size: 0.75rem; letter-spacing: 0.22em;
  color: var(--indigo); text-transform: uppercase;
}
section > h2 {
  font-family: var(--serif); font-weight: 700;
  font-size: 1.75rem; letter-spacing: 0.05em;
  margin: 0.35rem 0 1.6rem; line-height: 1.5;
}
section h3 {
  font-family: var(--serif); font-weight: 600; font-size: 1.18rem;
  margin: 2.6rem 0 0.9rem; letter-spacing: 0.04em;
}
p + p { margin-top: 1em; }
section a { color: var(--indigo); text-decoration-color: color-mix(in srgb, var(--indigo) 35%, transparent); }
em { font-style: normal; background: linear-gradient(transparent 68%, var(--indigo-soft) 68%); }
strong { font-weight: 700; }

/* ---------- stat cards ---------- */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; margin: 2rem 0 0; }
.stat {
  background: var(--surface); border: 1px solid var(--line); border-radius: 14px;
  padding: 1.3rem 1.4rem;
}
.stat .num { font-family: var(--mono); font-size: 1.9rem; font-weight: 600; color: var(--indigo); line-height: 1.3; }
.stat .num.dead { color: var(--crimson); }
.stat .desc { font-size: 0.82rem; color: var(--muted); margin-top: 0.4rem; line-height: 1.7; }

/* ---------- z badges ---------- */
.z {
  display: inline-block; font-family: var(--mono); font-size: 0.75rem; font-weight: 600;
  border-radius: 99px; padding: 0.16rem 0.7rem; white-space: nowrap; vertical-align: middle;
}
.z.hit { background: var(--indigo); color: #fff; }
.z.miss { background: transparent; color: var(--muted); border: 1px solid var(--line); }
.z.dead { background: var(--crimson-soft); color: var(--crimson); border: 1px solid color-mix(in srgb, var(--crimson) 30%, transparent); }

/* ---------- sample cards ---------- */
.sample { margin: 1.6rem 0; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.sample .head {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 0.75rem 1.2rem; border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface) 60%, var(--bg));
}
.sample .head .t { font-weight: 700; font-size: 0.9rem; }
.sample .body {
  padding: 1.1rem 1.3rem; font-size: 0.92rem; line-height: 2.05;
  max-height: 21em; overflow-y: auto;
}
.sample .body p + p { margin-top: 0.8em; }
.sample .note { padding: 0.55rem 1.3rem 0.8rem; font-size: 0.78rem; color: var(--muted); border-top: 1px dashed var(--line); line-height: 1.8; }

.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 720px) { .pair { grid-template-columns: 1fr; } }
.pair .sample { margin: 0; }
.pair-wrap { margin: 1.6rem 0; }

/* ---------- token coloring ---------- */
.tokens { font-size: 0.88rem; line-height: 2.2; }
.g { background: var(--green-bg); border-radius: 3px; }
.r { background: var(--red-bg); border-radius: 3px; }
.legend { display: flex; gap: 1rem; font-size: 0.78rem; color: var(--muted); margin: 0.8rem 0; flex-wrap: wrap; }
.legend .g, .legend .r { padding: 0.05rem 0.6rem; }

/* ---------- tables ---------- */
.tbl-wrap { overflow-x: auto; margin: 1.4rem 0; }
table { border-collapse: collapse; width: 100%; font-size: 0.86rem; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
th, td { padding: 0.6rem 0.95rem; text-align: left; border-bottom: 1px solid var(--line); }
th { font-size: 0.74rem; letter-spacing: 0.08em; color: var(--muted); font-weight: 600; background: color-mix(in srgb, var(--surface) 60%, var(--bg)); }
td.mono, th.mono { font-family: var(--mono); font-size: 0.8rem; }
tr:last-child td { border-bottom: none; }
td .hi { color: var(--indigo); font-weight: 700; }
td .lo { color: var(--crimson); font-weight: 700; }

/* ---------- scheme cards ---------- */
.schemes { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; margin-top: 1.6rem; }
.scheme { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 1.3rem 1.4rem; }
.scheme .k { font-family: var(--mono); font-size: 0.7rem; color: var(--muted); letter-spacing: 0.15em; }
.scheme h4 { font-family: var(--serif); font-size: 1.05rem; margin: 0.3rem 0 0.6rem; }
.scheme p { font-size: 0.84rem; line-height: 1.9; color: color-mix(in srgb, var(--ink) 82%, var(--muted)); }
.scheme .tag { display: inline-block; margin-top: 0.8rem; font-size: 0.7rem; font-family: var(--mono); border-radius: 99px; padding: 0.12rem 0.6rem; }
.scheme .tag.alive { background: var(--indigo-soft); color: var(--indigo); }
.scheme .tag.hist { background: var(--bg); color: var(--muted); border: 1px solid var(--line); }

/* ---------- figure ---------- */
figure.diagram { margin: 2rem 0; text-align: center; }
figure.diagram svg { max-width: 100%; height: auto; }
figcaption { font-size: 0.78rem; color: var(--muted); margin-top: 0.7rem; line-height: 1.8; }

/* ---------- callout ---------- */
.callout {
  border-left: 3px solid var(--indigo); background: var(--surface);
  border-radius: 0 12px 12px 0; padding: 1rem 1.3rem; margin: 1.6rem 0;
  font-size: 0.9rem;
}

/* ---------- code ---------- */
pre {
  background: #23211c; color: #eae6dd; border-radius: 12px;
  padding: 1.1rem 1.3rem; overflow-x: auto;
  font-family: var(--mono); font-size: 0.78rem; line-height: 1.8; margin: 1.3rem 0;
}
code { font-family: var(--mono); font-size: 0.85em; background: var(--indigo-soft); border-radius: 4px; padding: 0.08em 0.35em; }
pre code { background: none; padding: 0; }

/* ---------- references ---------- */
ol.refs { padding-left: 1.4rem; font-size: 0.86rem; }
ol.refs li { margin-bottom: 0.7rem; line-height: 1.9; }

ul { padding-left: 1.4rem; }
li { margin-bottom: 0.45em; }

footer {
  border-top: 1px solid var(--line); margin-top: 4rem;
  padding: 2.2rem 1.4rem 3rem; text-align: center;
  font-size: 0.78rem; color: var(--muted); font-family: var(--mono);
}
footer a { color: var(--indigo); }

/* ---------- mobile ---------- */
@media (max-width: 680px) {
  nav { padding: 0.7rem 1rem; }
  nav .brand small { display: none; }
  nav .links { gap: 0.7rem; font-size: 0.82rem; }
  nav .links a[href^="#"] { display: none; }
  header.hero { padding: 4.5rem 1.2rem 3.5rem; }
  .hero h1 br { display: none; }
  .hero h1 { font-size: clamp(1.9rem, 8.5vw, 2.5rem); letter-spacing: 0.05em; line-height: 1.45; }
  .hero .glyph { font-size: 13rem; right: -2rem; opacity: 0.045; }
  main { padding: 0 1.2rem 4rem; }
  section > h2 { font-size: 1.45rem; }
}