:root {
  color-scheme: dark;
  --deep: #071d27;
  --surface: rgba(15, 44, 50, 0.84);
  --ink: #e8f0eb;
  --muted: #b6c7c1;
  --subtle: #9aadaa;
  --mint: #b7dfc9;
  --gold: #d8bf88;
  --line: rgba(168, 203, 190, 0.2);
}

* { box-sizing: border-box; }
html { min-width: 320px; }
body {
  min-width: 320px;
  margin: 0;
  background:
    radial-gradient(circle at 90% 4%, rgba(100, 154, 142, 0.15), transparent 28rem),
    var(--deep);
  color: var(--ink);
  font: 16px/1.8 "Avenir Next", "Hiragino Sans", "Yu Gothic", system-ui, sans-serif;
}
a { color: var(--mint); text-underline-offset: 0.18em; }
a:focus-visible { outline: 3px solid var(--gold); outline-offset: 3px; }
.wrap { width: min(860px, calc(100% - 36px)); margin: 0 auto; }
.site-head { display: flex; justify-content: space-between; gap: 1rem; padding: 1.3rem 0; border-bottom: 1px solid var(--line); }
.brand { color: var(--ink); font-size: 0.78rem; font-weight: 800; letter-spacing: 0.18em; text-decoration: none; }
.eyebrow { margin: 2.5rem 0 0.35rem; color: var(--mint); font-size: 0.72rem; letter-spacing: 0.16em; }
h1 { max-width: 19em; margin: 0; font-size: clamp(2rem, 7vw, 3.4rem); line-height: 1.25; }
.dek { max-width: 45rem; margin: 1rem 0 1.5rem; color: var(--muted); font-size: 1.08rem; }
main { padding-bottom: 2rem; }
.panel { margin: 1.2rem 0; padding: 1.15rem clamp(1rem, 4vw, 1.6rem); border: 1px solid var(--line); border-radius: 16px; background: var(--surface); }
h2 { margin: 2rem 0 0.45rem; color: var(--mint); font-size: 1.35rem; line-height: 1.4; }
h3 { margin: 1.4rem 0 0.35rem; color: var(--gold); font-size: 1.05rem; }
p, ul, ol { max-width: 48rem; }
li + li { margin-top: 0.35rem; }
.note { border-left: 3px solid var(--gold); padding-left: 1rem; color: var(--muted); }
.action-link { display: inline-flex; min-height: 44px; align-items: center; margin: 0.5rem 0; padding: 0.35rem 0.8rem; border: 1px solid var(--line); border-radius: 10px; text-decoration: none; }
.table-wrap { overflow-x: auto; margin: 1rem 0; }
table { width: 100%; min-width: 560px; border-collapse: collapse; }
th, td { padding: 0.65rem; border: 1px solid var(--line); text-align: left; vertical-align: top; }
th { color: var(--mint); }
code, pre { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
code { color: var(--mint); }
pre { overflow-x: auto; padding: 1rem; border: 1px solid var(--line); border-radius: 10px; background: rgba(3, 17, 22, 0.7); font-size: 0.88rem; }
.chain { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 0.55rem; margin: 1.2rem 0; padding: 0; list-style: none; }
.chain li { min-width: 0; padding: 0.75rem; border: 1px solid var(--line); border-radius: 10px; background: rgba(3, 17, 22, 0.45); font-size: 0.85rem; }
.chain strong { display: block; color: var(--mint); }
.card-list { display: grid; gap: 1rem; margin: 1.3rem 0; }
.card-list article { padding: 1.1rem 1.2rem; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); }
.card-list h2 { margin: 0 0 0.25rem; font-size: 1.2rem; }
.card-list p { margin: 0.4rem 0 0; color: var(--muted); }
.meta { color: var(--subtle); font-size: 0.83rem; }
footer { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.7rem; padding: 1.5rem 0 2.5rem; border-top: 1px solid var(--line); color: var(--subtle); font-size: 0.82rem; }
@media (max-width: 620px) {
  .site-head { align-items: flex-start; flex-direction: column; }
  .chain { grid-template-columns: 1fr; }
}