:root {
  --bg: #FFF8F4;
  --card: #FFFFFF;
  --line: #FFE3EC;
  --ink: #4A3F55;
  --muted: #8A7F92;
  --pink: #FF7BA9;
  --pink-deep: #F2568C;
  --mint: #6FD6C0;
  --butter: #FFD166;
  --lav: #B49BFF;
  --radius: 16px;
  --shadow: 0 10px 30px rgba(255,123,169,.14);
  --font-title: "Douxiaopin Title", -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
}

@font-face {
  font-family: "Douxiaopin Title";
  src: url("../fonts/douxiaopin-title.woff2") format("woff2");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; padding: 0 16px 64px;
  background:
    radial-gradient(circle at 12% 0%, rgba(255,123,169,.16) 0%, transparent 45%),
    radial-gradient(circle at 88% 12%, rgba(180,155,255,.16) 0%, transparent 45%),
    var(--bg);
  color: var(--ink);
  font: 16px/1.75 var(--font-body);
}

/* 顶栏 */
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  padding: 10px 4px; margin: 0 auto; max-width: 860px;
  background: rgba(255,248,244,.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.topbar .brand {
  display: flex; align-items: center; gap: 8px;
  font-family: var(--font-title); font-size: 19px; letter-spacing: .5px;
  color: var(--ink); text-decoration: none;
}
.toc { display: flex; gap: 4px; flex-wrap: wrap; margin-left: auto; }
.toc a {
  font-size: 13px; color: var(--muted); text-decoration: none;
  padding: 6px 10px; border-radius: 999px; border: 1px solid transparent;
  min-height: 34px; display: inline-flex; align-items: center;
}
.toc a:hover { color: var(--pink-deep); border-color: var(--line); background: #fff; }

main { max-width: 760px; margin: 0 auto; }

/* Hero */
.hero { padding: 34px 0 10px; }
.hero h1 {
  font-family: var(--font-title); font-size: 34px; line-height: 1.3;
  margin: 0 0 12px; letter-spacing: 1px;
}
.lead { color: var(--muted); font-size: 16px; margin: 0 0 18px; max-width: 620px; }
.cta {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 48px; padding: 0 26px; border-radius: 999px;
  background: linear-gradient(180deg, #FF9BBD, var(--pink));
  color: #fff; font-weight: 700; text-decoration: none;
  box-shadow: 0 8px 22px rgba(255,123,169,.35), inset 0 1px 0 rgba(255,255,255,.5);
}
.cta:hover { background: linear-gradient(180deg, #FF8DB3, var(--pink-deep)); }

/* 章节 */
section { padding: 34px 0 6px; border-top: 1px solid var(--line); }
.hero + section { border-top: 0; }
h2 {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-title); font-size: 24px; letter-spacing: .5px;
  margin: 0 0 14px;
}
h2 .num {
  flex: none; width: 34px; height: 34px; border-radius: 12px;
  display: grid; place-items: center;
  background: linear-gradient(180deg, #FF9BBD, var(--pink));
  color: #fff; font-size: 17px; font-family: var(--font-body); font-weight: 700;
  box-shadow: 0 4px 12px rgba(255,123,169,.3);
}
p { margin: 10px 0; }
ul, ol { padding-left: 22px; }
li { margin: 6px 0; color: #5A4E66; }
b { color: var(--ink); }
code {
  font: 13px/1.4 ui-monospace, Menlo, Consolas, monospace;
  background: #FFF1F6; border: 1px solid var(--line); border-radius: 6px; padding: 1px 6px;
}
a { color: var(--pink-deep); }

/* 图 */
figure {
  margin: 18px 0; padding: 10px;
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow);
}
figure img { display: block; width: 100%; height: auto; border-radius: 10px; }
figure.narrow { max-width: 330px; margin-left: auto; margin-right: auto; }
figcaption { font-size: 12px; color: var(--muted); margin-top: 8px; text-align: center; }

/* 表格 */
table {
  width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 14px;
  background: var(--card); border-radius: 12px; overflow: hidden;
  box-shadow: 0 4px 14px rgba(74,63,85,.06);
}
th, td { border-bottom: 1px solid var(--line); padding: 9px 12px; text-align: left; }
th { background: #FFF1F6; font-weight: 700; font-size: 13px; }
tr:last-child td { border-bottom: 0; }

/* FAQ */
details {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 4px 14px; margin: 10px 0;
}
details[open] { box-shadow: var(--shadow); }
summary {
  cursor: pointer; min-height: 44px; display: flex; align-items: center;
  font-weight: 600; color: var(--ink); list-style: none;
}
summary::-webkit-details-marker { display: none; }
summary::after { content: "＋"; margin-left: auto; color: var(--pink); font-weight: 700; }
details[open] summary::after { content: "－"; }
details p { color: #5A4E66; font-size: 15px; margin: 0 0 12px; }

.closing {
  margin-top: 26px; padding: 26px 22px; border-radius: 20px;
  background: var(--card); border: 1px solid var(--line); box-shadow: var(--shadow);
  text-align: center; border-top: 1px solid var(--line);
}
.closing h2 { justify-content: center; }

footer {
  max-width: 760px; margin: 40px auto 0; padding-top: 16px;
  border-top: 1px solid var(--line); color: var(--muted); font-size: 13px;
  display: flex; gap: 12px; flex-wrap: wrap; justify-content: space-between;
}
footer a { color: var(--muted); text-decoration: none; margin-right: 12px; }
footer a:hover { color: var(--pink-deep); text-decoration: underline; }

/* 手机 */
@media (max-width: 640px) {
  body { font-size: 15px; padding: 0 12px 48px; }
  .hero { padding: 22px 0 6px; }
  .hero h1 { font-size: 26px; }
  .toc { display: none; }
  section { padding: 26px 0 4px; }
  h2 { font-size: 20px; }
  figure { padding: 8px; margin: 14px 0; }
  table { font-size: 13px; }
  th, td { padding: 8px 9px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}