:root {
  --night: #071018;
  --paper: #f4e7d4;
  --gold: #e4c27a;
  --mist: #b7cdd4;
  --line: rgba(244, 231, 212, 0.16);
  --measure: 40rem;
}

* { box-sizing: border-box; }

html { background: var(--night); }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--paper);
  background:
    radial-gradient(ellipse 70% 42% at 80% -8%, rgba(120, 168, 132, 0.16), transparent 58%),
    radial-gradient(ellipse 46% 36% at -10% 110%, rgba(56, 104, 132, 0.22), transparent 52%),
    var(--night);
  font-family: "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
  font-size: 17px;
  line-height: 1.7;
}

html[data-lang="zh"] [data-lang="en"],
html[data-lang="en"] [data-lang="zh"] {
  display: none;
}

a { color: var(--gold); text-underline-offset: 0.18em; }
a:hover { color: #f3dfb0; }

.wrap {
  width: min(var(--measure), calc(100% - 2.5rem));
  margin: 0 auto;
  padding: 2.5rem 0 4.5rem;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1.5rem;
  padding-bottom: 1.4rem;
  border-bottom: 1px solid var(--line);
}

.mark {
  margin: 0;
  font-family: "Iowan Old Style", Palatino, "Palatino Linotype", "Songti SC", "STSong", serif;
  font-size: 1.15rem;
  letter-spacing: 0.04em;
}

nav {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  font-size: 0.95rem;
}

nav a {
  color: var(--mist);
  text-decoration: none;
}

nav a[aria-current="page"] {
  color: var(--paper);
  box-shadow: inset 0 -1px 0 var(--gold);
}

#lang {
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
  color: var(--gold);
  font: inherit;
  cursor: pointer;
}

#lang:focus-visible,
a:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

h1 {
  margin: 2.2rem 0 0.4rem;
  font-family: "Iowan Old Style", Palatino, "Palatino Linotype", "Songti SC", "STSong", serif;
  font-size: clamp(2.4rem, 5vw, 3.4rem);
  font-weight: 500;
  letter-spacing: 0.01em;
  line-height: 1.15;
}

.lede {
  margin: 0;
  max-width: 36rem;
  color: var(--mist);
}

.meta {
  margin: 1.3rem 0 0;
  color: var(--mist);
  font-size: 0.92rem;
}

h2 {
  margin: 2.4rem 0 0.55rem;
  font-family: "Iowan Old Style", Palatino, "Palatino Linotype", "Songti SC", "STSong", serif;
  font-size: 1.45rem;
  font-weight: 500;
}

p { margin: 0.7rem 0; }

ul, ol { margin: 0.7rem 0; padding-left: 1.2rem; }
li + li { margin-top: 0.35rem; }

.contact {
  margin-top: 1.6rem;
  padding: 1.1rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: 16px;
}

.contact strong {
  font-family: "Iowan Old Style", Palatino, "Palatino Linotype", "Songti SC", serif;
  font-size: 1.15rem;
  font-weight: 500;
}

footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--mist);
  font-size: 0.92rem;
}

@media (max-width: 640px) {
  header { flex-direction: column; align-items: flex-start; gap: 0.8rem; }
  .wrap { width: min(var(--measure), calc(100% - 2rem)); }
}