:root {
  --crimson: #b81f2a;
  --crimson-deep: #931823;
  --cream: #fbf3e3;
  --gold: #edc266;
  --ink: #1f1d33;
  --muted: #5d5872;
  --card: #ffffff;
  --line: rgba(31, 29, 51, 0.1);
  --bg: var(--cream);
  --accent: #ed7745;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #fbf3e3;
    --muted: #b9adb6;
    --card: #291924;
    --line: rgba(251, 243, 227, 0.1);
    --bg: #190c16;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
a { color: var(--accent); }
.top {
  display: flex; flex-wrap: wrap; gap: 12px 24px; align-items: center; justify-content: space-between;
  padding: 16px max(16px, calc((100% - 760px) / 2));
  background: var(--crimson); color: var(--cream);
}
.brand { display: flex; align-items: center; gap: 10px; color: inherit; text-decoration: none; font-weight: 800; font-size: 20px; }
.brand img { border-radius: 9px; }
nav { display: flex; flex-wrap: wrap; gap: 4px 18px; }
nav a { color: var(--cream); text-decoration: none; opacity: 0.8; font-weight: 600; font-size: 15px; }
nav a:hover, nav a[aria-current] { opacity: 1; text-decoration: underline; text-underline-offset: 4px; }
nav .lang { border: 1px solid rgba(251, 243, 227, 0.5); border-radius: 99px; padding: 0 10px; }
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 48px; }
h1 { font-size: 34px; line-height: 1.2; margin: 0 0 6px; }
h2 { font-size: 21px; margin: 36px 0 8px; }
.updated { color: var(--muted); margin: 0 0 24px; font-size: 15px; }
.summary { background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 18px 22px; }
.summary ul { margin: 0; padding-left: 20px; }
li { margin: 4px 0; }
.hero { text-align: center; padding: 24px 0 8px; }
.hero img { border-radius: 36px; box-shadow: 0 14px 40px rgba(147, 24, 35, 0.3); }
.hero h1 { font-size: 44px; margin-top: 20px; }
.hero p { color: var(--muted); font-size: 19px; }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; margin-top: 32px; }
.features div { background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 18px; }
.features b { display: block; margin-bottom: 4px; }
details { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 12px 18px; margin: 10px 0; }
summary { cursor: pointer; font-weight: 600; }
.button {
  display: inline-block; background: var(--accent); color: #fff; font-weight: 700; text-decoration: none;
  padding: 12px 22px; border-radius: 99px; margin: 8px 0;
}
.copy { margin-left: 8px; font: inherit; font-size: 14px; border: 1px solid var(--line); background: var(--card); color: var(--ink); border-radius: 99px; padding: 6px 14px; cursor: pointer; }
.bottom { text-align: center; color: var(--muted); font-size: 14px; padding: 24px 16px 40px; border-top: 1px solid var(--line); }
@media (max-width: 520px) {
  h1 { font-size: 28px; }
  .hero h1 { font-size: 36px; }
}