:root {
  color-scheme: light;
  --sea: #0d5260;
  --ink: #16383c;
  --muted: #426268;
  --border: #c6dcd8;
  --paper: #f8fcfa;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--ink);
  background: #e4f1ee;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 1rem;
  line-height: 1.75;
}

.page {
  max-width: 48rem;
  margin: clamp(1rem, 6vw, 4rem) auto;
  padding: clamp(1.25rem, 5vw, 3rem);
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 1rem;
}

.intro {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.app-icon { border-radius: 1rem; }
.label { margin: 0 0 .25rem; color: var(--muted); }
h1 { margin: 0; font-size: clamp(1.45rem, 5vw, 2.25rem); line-height: 1.2; }
h2 { margin: 0 0 .75rem; font-size: 1.2rem; }
section { margin: 1.75rem 0; }
p { margin: .6rem 0; }
dl { margin: 0; }
dt { margin-top: 1rem; font-weight: 650; }
dd { margin: .2rem 0 0; }
a { color: var(--sea); text-underline-offset: .17em; overflow-wrap: anywhere; }
a:focus-visible { outline: 2px solid var(--sea); outline-offset: 3px; }

footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: .5rem 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: .9rem;
}

@media (max-width: 50rem) {
  .page { margin-inline: 1rem; }
}