:root {
  --bg: #fcf2f2;
  --paper: #fffafa;
  --ink: #4b3b47;
  --muted: #695a65;
  --line: #efdddd;
  --accent: #f7cace;
  --soft: #f9e3d9;
  --blue: #d0e1f1;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e171c;
    --paper: #20312b;
    --ink: #e8f1e8;
    --muted: #b3c9b6;
    --line: #2c3e2b;
    --accent: #526951;
    --soft: #2c3e2b;
    --blue: #2c3e2b;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.75 -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
a { color: inherit; }
.wrap { max-width: 880px; margin: 0 auto; padding: 0 20px; }
header.top { display: flex; align-items: center; justify-content: space-between; padding: 22px 0; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 18px; text-decoration: none; }
.brand img { width: 32px; height: 32px; border-radius: 8px; }
nav a { color: var(--muted); font-size: 14px; text-decoration: none; margin-left: 18px; }
nav a:hover { color: var(--ink); text-decoration: underline; }

.hero { display: grid; grid-template-columns: 1.1fr .9fr; gap: 28px; align-items: center; padding: 36px 0 56px; }
.hero h1 { font-size: clamp(38px, 7vw, 60px); line-height: 1.1; margin: 0 0 14px; letter-spacing: -1px; }
.hero .subtitle { font-size: 24px; font-weight: 700; margin: 0 0 12px; }
.hero p.lead { font-size: 19px; margin: 0 0 22px; color: var(--muted); }
.hero .art { border-radius: 28px; padding: 26px; background: var(--paper); border: 1px solid var(--line); }
.hero .art img { width: 100%; height: auto; display: block; }
.badge { display: inline-block; padding: 9px 18px; border-radius: 999px; background: var(--ink); color: var(--bg); font-weight: 700; font-size: 14px; }

h2 { font-size: 26px; margin: 0 0 18px; }
.features { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; padding-bottom: 48px; }
.card { background: var(--paper); border: 1px solid var(--line); border-radius: 22px; padding: 22px; }
.card h3 { margin: 0 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.card img { width: 96px; height: 72px; object-fit: contain; float: right; margin: -4px -4px 6px 10px; }
.promise { background: var(--soft); border-radius: 22px; padding: 24px 26px; margin-bottom: 56px; }
.promise p { margin: 6px 0 0; }

article.doc { background: var(--paper); border: 1px solid var(--line); border-radius: 24px; padding: 30px clamp(20px, 5vw, 44px); margin: 10px 0 48px; }
article.doc h1 { font-size: 30px; margin: 0 0 4px; }
article.doc h2 { font-size: 20px; margin: 32px 0 10px; }
article.doc p, article.doc li { color: var(--ink); }
article.doc .meta { color: var(--muted); font-size: 14px; margin: 0 0 18px; }
article.doc table { width: 100%; border-collapse: collapse; font-size: 15px; margin: 8px 0 4px; }
article.doc th, article.doc td { text-align: left; vertical-align: top; padding: 9px 10px; border-bottom: 1px solid var(--line); }
article.doc th { color: var(--muted); font-weight: 700; }
.todo { background: #fff3b0; color: #4b3b47; padding: 0 4px; border-radius: 4px; }

footer.bottom { border-top: 1px solid var(--line); padding: 22px 0 34px; font-size: 13px; color: var(--muted); display: flex; flex-wrap: wrap; gap: 8px 18px; }
footer.bottom a { color: var(--muted); }

@media (max-width: 680px) {
  .hero { grid-template-columns: 1fr; padding-top: 12px; }
  .hero .art { max-width: 320px; }
  .features { grid-template-columns: 1fr; }
  nav a { margin-left: 12px; }
  article.doc table, article.doc thead, article.doc tbody, article.doc tr, article.doc th, article.doc td { display: block; }
  article.doc thead { display: none; }
  article.doc td { border: 0; padding: 2px 0; }
  article.doc tr { border-bottom: 1px solid var(--line); padding: 8px 0; }
  article.doc td:first-child { font-weight: 700; }
}

/* Dark mode: 毛毛儿 is black, so keep a light backdrop behind the pictures (after the base rules so it wins). */
@media (prefers-color-scheme: dark) {
  .hero .art { background: #fcf2f2; border-color: #fcf2f2; }
  .card img { background: #fcf2f2; border-radius: 16px; padding: 6px; }
}