:root {
  color-scheme: light dark;
  --bg: #f4f4f2;
  --fg: #1a1a1a;
  --muted: #5f5f5a;
  --line: rgba(0, 0, 0, 0.1);
  --card: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101010;
    --fg: #f4f4f2;
    --muted: #a6a6a0;
    --line: rgba(255, 255, 255, 0.12);
    --card: #181818;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.75 system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
.watermark {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14vw;
  font-weight: 900;
  font-style: italic;
  letter-spacing: -0.06em;
  color: var(--fg);
  opacity: 0.035;
  pointer-events: none;
  user-select: none;
}
.wrap {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding: 32px 24px 96px;
}
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
header a.back {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
}
header a.back:hover { color: var(--fg); }
header img { height: 28px; width: auto; }
@media (prefers-color-scheme: dark) {
  header img { filter: invert(1); }
}
.eyebrow {
  margin-top: 48px;
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--muted);
}
h1 {
  margin: 12px 0 8px;
  font-size: clamp(2.2rem, 7vw, 4rem);
  line-height: 0.95;
  font-weight: 900;
  font-style: italic;
  letter-spacing: -0.055em;
}
.meta {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}
.intro { margin-top: 24px; color: var(--muted); }
.callout {
  margin-top: 28px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--card);
  color: var(--muted);
}
.callout strong { color: var(--fg); }
section { margin-top: 36px; }
h3 {
  margin: 0 0 6px;
  font-size: 1.05rem;
  font-weight: 900;
  font-style: italic;
  letter-spacing: -0.01em;
}
.divider { margin-top: 64px; border-top: 1px solid var(--line); }
.en-title { margin-top: 32px; font-size: clamp(1.8rem, 5vw, 2.6rem); }
.lang { font-size: 11px; font-weight: 800; letter-spacing: 0.18em; text-transform: uppercase; }
.lang a { color: var(--muted); }
.lang a:hover { color: var(--fg); }
h2 {
  margin: 0 0 10px;
  font-size: 1.25rem;
  font-weight: 900;
  font-style: italic;
  letter-spacing: -0.02em;
  display: flex;
  gap: 12px;
  align-items: baseline;
}
h2 .n {
  font-size: 10px;
  font-weight: 900;
  font-style: normal;
  letter-spacing: 0.2em;
  color: var(--muted);
}
p { margin: 10px 0; color: var(--muted); }
ul { margin: 10px 0; padding-left: 1.25em; color: var(--muted); }
li { margin: 6px 0; }
a { color: var(--fg); }
footer {
  margin-top: 56px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
footer a { color: var(--muted); }
footer a:hover { color: var(--fg); }
@media (max-width: 600px) {
  .wrap { padding: 24px 18px 72px; }
  header img { height: 24px; }
}