:root {
  --o: #EB4F27;
  --od: #c23e1c;
  --n: #172033;
  --bg: #f5f6f9;
  --mut: #5a6275;
  --line: #e3e6ee;
  --f: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--f);
  color: var(--n);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--o); }
a:hover { color: var(--od); }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

.ann {
  background: var(--n);
  color: #fff;
  text-align: center;
  font-size: .9rem;
  padding: 10px 16px;
}
.ann b { color: #ff8a66; }

header {
  background: #fff;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 20;
}
.hd {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 58px;
  gap: 12px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 900;
  letter-spacing: -.02em;
  font-size: 1.15rem;
  text-decoration: none;
  color: var(--n);
}
.logo img {
  width: 28px;
  height: 28px;
  background: #fff;
  border-radius: 6px;
}
.logo b { color: var(--o); }
.hd-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  font-size: .88rem;
  font-weight: 600;
}
.hd-nav a {
  color: var(--mut);
  text-decoration: none;
}
.hd-nav a:hover,
.hd-nav a[aria-current="page"] {
  color: var(--o);
}

main {
  max-width: 880px;
  margin: 0 auto;
  padding: 32px 20px 48px;
}
.page-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 28px 24px 36px;
}
h1 {
  font-size: clamp(1.6rem, 4vw, 2rem);
  letter-spacing: -.02em;
  line-height: 1.2;
  margin-bottom: .35rem;
}
.meta {
  color: var(--mut);
  font-size: .92rem;
  margin-bottom: 1.25rem;
}
h2 {
  font-size: 1.15rem;
  margin: 1.6rem 0 .5rem;
  letter-spacing: -.01em;
}
p, li { font-size: 1rem; }
p + p { margin-top: .85rem; }
ul, ol {
  padding-left: 1.25rem;
  margin: .5rem 0 0;
}
li + li { margin-top: .35rem; }
.note-box {
  margin-top: 1rem;
  padding: 12px 14px;
  background: #fff7f4;
  border: 1px solid #f3d2c6;
  border-radius: 10px;
  font-size: .95rem;
}
.tbd {
  background: #fff8db;
  border: 1px dashed #c9a227;
  color: #6a5400;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .9em;
}

footer {
  background: var(--n);
  color: #c8cdd9;
  padding: 36px 0;
  margin-top: 8px;
  font-size: .9rem;
}
.ft {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  gap: 22px;
}
@media (min-width: 720px) {
  .ft { grid-template-columns: 1.2fr 1fr 1fr; }
}
.ft strong { color: #fff; display: block; margin-bottom: 8px; }
.ft ul { list-style: none; padding: 0; margin: 0; }
.ft li + li { margin-top: 6px; }
.ft a { color: #ffb39f; text-decoration: none; }
.ft a:hover { text-decoration: underline; }
.ft-copy {
  grid-column: 1 / -1;
  border-top: 1px solid rgba(255,255,255,.12);
  padding-top: 16px;
  font-size: .85rem;
  color: #9aa3b5;
}