:root {
  color-scheme: light;
  --ink: #192c32;
  --muted: #435d61;
  --teal: #006154;
  --line: #d8e6e1;
  --surface: #f4f8f5;
  font-family: system-ui, -apple-system, "PingFang TC", "Microsoft JhengHei", sans-serif;
  background: #fcfdfb;
  color: var(--ink);
  line-height: 1.75;
}
* { box-sizing: border-box; }
body { margin: 0; }
a { color: var(--teal); text-underline-offset: .2em; }
a:hover { color: #00443b; }
a:focus-visible { outline: 3px solid #008475; outline-offset: 4px; }
.skip { position: fixed; top: -6rem; left: 1rem; padding: .65rem 1rem; background: white; z-index: 2; }
.skip:focus { top: 1rem; }
.shell { display: grid; grid-template-columns: 254px minmax(0, 1fr); min-height: 100vh; }
.sidebar {
  background: #edf5f1;
  border-right: 1px solid var(--line);
  padding: 2.05rem 1.3rem;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}
.brand { display: flex; gap: .75rem; align-items: center; font-weight: 800; text-decoration: none; color: var(--ink); line-height: 1.5; }
.brand small { display: block; font-weight: 550; color: var(--muted); }
.logo { border-radius: .65rem; padding: .65rem .55rem; background: var(--teal); color: white; letter-spacing: .06em; font-size: .85rem; }
nav { margin-top: 2rem; }
.nav-group { font-size: .76rem; font-weight: 750; color: var(--muted); margin: 1rem 0 .3rem .6rem; letter-spacing: .08em; }
nav a { display: block; padding: .44rem .65rem; margin: .15rem 0; border-radius: .4rem; text-decoration: none; color: var(--ink); }
nav a:hover { background: #dcebe5; }
nav [aria-current="page"] { background: #d4ebe2; font-weight: 750; color: #004d43; }
.stamp { border-top: 1px solid #c9dcd4; padding: .85rem .6rem; margin-top: 2rem; color: var(--muted); font-size: .82rem; }
main { width: 100%; max-width: 1250px; padding: 2rem clamp(1.25rem, 4.1vw, 4.4rem); }
.topline { display: flex; justify-content: space-between; gap: .5rem; color: var(--muted); padding-bottom: .8rem; margin-bottom: 1.6rem; border-bottom: 1px solid var(--line); font-size: .82rem; }
h1, h2, h3 { line-height: 1.35; margin-bottom: .55em; }
h1 { font-size: clamp(1.85rem, 4.2vw, 3.4rem); margin-top: .25em; letter-spacing: -.028em; }
h2 { margin-top: 1.8em; font-size: clamp(1.35rem, 2.7vw, 1.8rem); }
h3 { margin-top: 1.55em; font-size: 1.2rem; }
p, ul, ol { margin-top: .65em; margin-bottom: 1.1em; }
li + li { margin-top: .45rem; }
.hero { background: #e3f1e9; border: 1px solid #cce4d8; padding: clamp(1.35rem, 4vw, 3.4rem); border-radius: 1rem; }
.eyebrow { margin: 0; font-size: .77rem; font-weight: 800; letter-spacing: .16em; color: var(--teal); }
.intro { color: var(--muted); font-size: 1.12rem; max-width: 45ch; }
.actions, .toolbar { display: flex; gap: 1rem; align-items: center; flex-wrap: wrap; }
.button { display: inline-block; padding: .5rem .95rem; border-radius: .45rem; color: #fff; background: var(--teal); font-weight: 650; text-decoration: none; }
.button:hover { color: #fff; background: #00483f; }
.notice, blockquote { margin: 1.2rem 0; padding: .95rem 1.1rem; border-left: 4px solid #9c5427; background: #fff3e6; color: #4e3422; }
.notice p, blockquote p { margin: .25rem 0 0; }
.cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .9rem; }
.cards a { display: grid; gap: .2rem; padding: 1.1rem; color: var(--ink); border: 1px solid var(--line); border-radius: .65rem; background: white; text-decoration: none; }
.cards a:hover { border-color: var(--teal); background: var(--surface); }
.cards small { color: var(--teal); letter-spacing: .09em; font-weight: 800; }
.cards strong { font-size: 1.18rem; }
.cards span, .toolbar span { color: var(--muted); }
.summary { margin-top: 1.25rem; }
table { width: 100%; border-collapse: collapse; font-size: .92rem; margin: 1rem 0 1.35rem; overflow-wrap: anywhere; }
th, td { vertical-align: top; text-align: left; padding: .68rem .72rem; border: 1px solid var(--line); }
th { background: #e5f1ec; }
tr:nth-child(even) td { background: var(--surface); }
pre { background: var(--surface); padding: .8rem 1rem; border: 1px solid var(--line); border-radius: .5rem; white-space: pre-wrap; overflow-wrap: anywhere; }
footer { margin-top: 3rem; padding-top: 1rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .85rem; }
@media (max-width: 760px) {
  .shell { display: block; }
  .sidebar { position: static; height: auto; border-right: 0; border-bottom: 1px solid var(--line); padding: 1rem; }
  nav { display: flex; flex-wrap: wrap; gap: .25rem; margin-top: .65rem; }
  .nav-group, .stamp { display: none; }
  nav a { font-size: .88rem; margin: 0; padding: .33rem .55rem; }
  main { padding: 1.1rem; }
  table { display: block; overflow-x: auto; }
  th, td { min-width: 8rem; }
}
@media (max-width: 460px) {
  .cards { grid-template-columns: 1fr; }
}
@media print {
  .sidebar, .topline, .toolbar, .skip, footer { display: none; }
  .shell { display: block; }
  main { padding: 0; max-width: none; }
  table { display: table; }
  th, td { min-width: 0; }
  tr { break-inside: avoid; }
  h2, h3 { break-after: avoid; }
}