:root {
  color-scheme: light;
  --ink: #24333d;
  --muted: #61747d;
  --line: #dce5e8;
  --surface: #ffffff;
  --canvas: #f4f7f8;
  --accent: #4d8588;
  --accent-soft: #e4f0f0;
}

* { box-sizing: border-box; }
html { background: var(--canvas); }
body {
  margin: 0;
  color: var(--ink);
  background: var(--canvas);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.7;
}

a { color: var(--accent); }
.wrap { width: min(920px, calc(100% - 32px)); margin: 0 auto; }
.hero { padding: 56px 0 28px; }
.brand { display: flex; align-items: center; gap: 14px; }
.mark {
  width: 48px; height: 48px; border-radius: 14px;
  background: linear-gradient(145deg, #0e355d, #4d8588 58%, #9dd8c9);
  box-shadow: 0 8px 20px rgba(36, 76, 91, .18);
  position: relative;
}
.mark::after { content: ""; position: absolute; width: 12px; height: 12px; border-radius: 50%; background: #b9e2cf; left: 18px; top: 18px; }
h1, h2, h3 { line-height: 1.25; letter-spacing: -.02em; }
h1 { margin: 0; font-size: clamp(30px, 5vw, 44px); }
.tagline { color: var(--muted); margin: 10px 0 0; font-size: 17px; }
.language { margin-top: 24px; color: var(--muted); font-size: 14px; }
main { padding-bottom: 56px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 22px; padding: clamp(22px, 4vw, 38px); box-shadow: 0 10px 32px rgba(33, 66, 78, .06); margin-bottom: 18px; }
.meta { color: var(--muted); font-size: 14px; border-bottom: 1px solid var(--line); padding-bottom: 16px; margin-bottom: 24px; }
h2 { margin: 28px 0 10px; font-size: 23px; }
h3 { margin: 22px 0 6px; font-size: 18px; }
p { margin: 8px 0 14px; }
ul { margin: 8px 0 18px; padding-left: 1.25em; }
li { margin: 6px 0; }
.notice { border-left: 4px solid var(--accent); background: var(--accent-soft); padding: 14px 16px; border-radius: 10px; margin: 18px 0; }
.faq { padding: 12px 0 16px; border-bottom: 1px solid var(--line); }
.faq:last-child { border-bottom: 0; }
.faq strong { display: block; margin-bottom: 4px; }
footer { color: var(--muted); font-size: 13px; padding: 0 0 44px; }
code.placeholder { color: #9b3c2f; background: #fff0ed; padding: 2px 5px; border-radius: 5px; }
@media (max-width: 560px) {
  .hero { padding-top: 36px; }
  .card { border-radius: 16px; }
}