:root {
  color-scheme: light dark;
  --bg: #07131f;
  --surface: rgba(255, 255, 255, 0.07);
  --surface-strong: rgba(255, 255, 255, 0.11);
  --text: #f4f8fb;
  --muted: #aab9c6;
  --line: rgba(255, 255, 255, 0.13);
  --cyan: #48c8e8;
  --mint: #6ce5bc;
  --amber: #ffc66d;
  --max-width: 860px;
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans",
    "Noto Sans CJK SC", "Noto Sans CJK TC", "Hiragino Sans",
    "Yu Gothic UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 92% 0%, rgba(72, 200, 232, 0.18), transparent 32rem),
    radial-gradient(circle at 0% 90%, rgba(108, 229, 188, 0.13), transparent 30rem),
    var(--bg);
  line-height: 1.68;
}

a {
  color: var(--cyan);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.16em;
}

a:hover,
a:focus-visible {
  color: var(--mint);
}

.shell {
  width: min(calc(100% - 32px), var(--max-width));
  margin: 0 auto;
}

.site-header {
  padding: 28px 0 18px;
}

.brand-row,
.page-nav,
.language-nav,
.footer-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 18px;
}

.brand-row {
  justify-content: space-between;
}

.brand {
  color: var(--text);
  font-size: 1.06rem;
  font-weight: 760;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.language-nav {
  justify-content: flex-end;
  font-size: 0.86rem;
}

.language-nav a,
.page-nav a {
  color: var(--muted);
  text-decoration: none;
}

.language-nav a[aria-current="page"],
.page-nav a[aria-current="page"] {
  color: var(--text);
  font-weight: 700;
}

.page-nav {
  margin-top: 18px;
  padding-top: 15px;
  border-top: 1px solid var(--line);
  font-size: 0.94rem;
}

main {
  padding: 28px 0 70px;
}

.hero {
  padding: clamp(24px, 5vw, 44px);
  border: 1px solid var(--line);
  border-radius: 26px;
  background: linear-gradient(145deg, var(--surface-strong), var(--surface));
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.22);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--mint);
  font-size: 0.78rem;
  font-weight: 780;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  line-height: 1.25;
  letter-spacing: -0.025em;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 7vw, 3.5rem);
}

h2 {
  margin: 2.3rem 0 0.75rem;
  font-size: 1.35rem;
}

h3 {
  margin: 1.45rem 0 0.45rem;
  font-size: 1.02rem;
}

p,
ul,
ol {
  margin-top: 0.65rem;
  margin-bottom: 0.9rem;
}

ul,
ol {
  padding-left: 1.35rem;
}

li + li {
  margin-top: 0.45rem;
}

.lede {
  max-width: 68ch;
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.updated {
  display: inline-flex;
  margin-top: 20px;
  padding: 6px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.82rem;
}

.content {
  max-width: 76ch;
  margin: 0 auto;
  padding: 8px clamp(4px, 3vw, 24px) 0;
}

.notice,
.contact-card {
  margin: 1.5rem 0;
  padding: 17px 19px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
}

.notice {
  border-left: 4px solid var(--amber);
}

.contact-card {
  border-left: 4px solid var(--cyan);
}

.contact-card strong {
  display: block;
  margin-bottom: 4px;
}

code {
  padding: 0.13em 0.35em;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.1);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9em;
  overflow-wrap: anywhere;
}

.host-list {
  columns: 2 280px;
}

.checklist {
  list-style: none;
  padding-left: 0;
}

.checklist li {
  position: relative;
  padding-left: 1.7rem;
}

.checklist li::before {
  position: absolute;
  left: 0;
  color: var(--mint);
  content: "✓";
  font-weight: 800;
}

footer {
  padding: 24px 0 38px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.84rem;
}

.footer-row {
  justify-content: space-between;
}

@media (max-width: 560px) {
  .brand-row {
    align-items: flex-start;
  }

  .language-nav {
    justify-content: flex-start;
  }

  .hero {
    border-radius: 20px;
  }

  .footer-row {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f4f8fb;
    --surface: rgba(255, 255, 255, 0.82);
    --surface-strong: rgba(255, 255, 255, 0.98);
    --text: #11212d;
    --muted: #536976;
    --line: rgba(18, 48, 66, 0.14);
    --cyan: #087d9b;
    --mint: #087557;
    --amber: #a05d00;
  }

  body {
    background:
      radial-gradient(circle at 92% 0%, rgba(72, 200, 232, 0.16), transparent 32rem),
      radial-gradient(circle at 0% 90%, rgba(108, 229, 188, 0.12), transparent 30rem),
      var(--bg);
  }

  .hero {
    box-shadow: 0 24px 70px rgba(30, 73, 96, 0.12);
  }

  code {
    background: rgba(18, 48, 66, 0.08);
  }
}

@media print {
  :root {
    color-scheme: light;
    --bg: #ffffff;
    --surface: #ffffff;
    --surface-strong: #ffffff;
    --text: #111111;
    --muted: #444444;
    --line: #cccccc;
    --cyan: #005f77;
    --mint: #006347;
  }

  body {
    background: #ffffff;
  }

  .site-header,
  footer {
    display: none;
  }

  main {
    padding: 0;
  }

  .hero {
    padding: 0 0 20px;
    border: 0;
    box-shadow: none;
  }
}