:root {
  --bg: #0b0b0f;
  --fg: #f2f2f4;
  --muted: #9a9aa3;
  --line: #22222a;
  --accent: #e8a0a8;
  --card: #121218;
  --max: 40rem;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: dark;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.65;
  font-size: 16px;
}

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

a:hover {
  text-decoration: underline;
}

.wrap {
  max-width: calc(var(--max) + 3rem);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 4rem;
}

header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 2rem;
}

.brand {
  font-weight: 650;
  letter-spacing: 0.02em;
  color: var(--fg);
  text-decoration: none;
}

.brand:hover {
  text-decoration: none;
  color: var(--accent);
}

.brand span {
  color: var(--muted);
  font-weight: 500;
  margin-left: 0.4rem;
  font-size: 0.92em;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.1rem;
  font-size: 0.92rem;
}

nav a {
  color: var(--muted);
}

nav a[aria-current="page"] {
  color: var(--fg);
}

h1 {
  font-size: 1.75rem;
  line-height: 1.25;
  margin: 0 0 0.5rem;
  font-weight: 650;
  letter-spacing: -0.02em;
}

.meta {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0 0 1.75rem;
}

h2 {
  font-size: 1.15rem;
  margin: 2rem 0 0.65rem;
  font-weight: 650;
}

h3 {
  font-size: 1rem;
  margin: 1.35rem 0 0.4rem;
  font-weight: 600;
}

p,
li {
  color: #d8d8de;
}

ul {
  padding-left: 1.2rem;
}

li {
  margin: 0.3rem 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  margin: 0.75rem 0 1.25rem;
}

th,
td {
  border: 1px solid var(--line);
  padding: 0.55rem 0.65rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--card);
  color: var(--muted);
  font-weight: 600;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1.15rem 1.2rem;
  margin: 1rem 0;
}

.card h2 {
  margin-top: 0;
}

.hero {
  margin-bottom: 2rem;
}

.hero p.lead {
  font-size: 1.05rem;
  color: #cfcfd6;
  max-width: 34rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.25rem;
}

.btn {
  display: inline-block;
  padding: 0.6rem 0.95rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--fg);
  text-decoration: none;
  font-size: 0.92rem;
}

.btn:hover {
  text-decoration: none;
  border-color: #3a3a46;
}

.btn.primary {
  background: #f2f2f4;
  color: #111;
  border-color: #f2f2f4;
}

.lang-switch {
  font-size: 0.85rem;
  color: var(--muted);
}

footer {
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.panel[hidden] {
  display: none;
}