:root {
  --brand: #2fb8a8;
  --brand-dark: #1f8c80;
  --brand-soft: #e6f7f4;
  --ink: #1f2d3d;
  --ink-2: #43525f;
  --ink-3: #7a8a96;
  --line: #e8edf0;
  --bg: #f6f8fa;
  --card: #ffffff;
  --radius: 16px;
  --max: 720px;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 18px 64px;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-dark) 100%);
  color: #fff;
  padding: 38px 18px 30px;
  text-align: center;
}
.hero .logo {
  width: 56px; height: 56px;
  border-radius: 16px;
  background: rgba(255,255,255,.18);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 28px; margin-bottom: 12px;
}
.hero h1 { margin: 0; font-size: 24px; font-weight: 700; letter-spacing: .5px; }
.hero .sub { margin: 8px 0 0; opacity: .9; font-size: 14px; }

.meta {
  max-width: var(--max);
  margin: -18px auto 0;
  padding: 0 18px;
}
.meta .pill {
  display: inline-block;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 12px;
  color: var(--ink-3);
  box-shadow: 0 4px 14px rgba(31,45,61,.05);
}

/* TOC */
.toc {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin: 18px 0;
}
.toc h2 { margin: 0 0 10px; font-size: 15px; color: var(--ink-2); }
.toc ol { margin: 0; padding-left: 20px; }
.toc li { margin: 6px 0; }
.toc a { color: var(--ink-2); }

/* Sections */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 20px;
  margin: 16px 0;
  box-shadow: 0 2px 10px rgba(31,45,61,.03);
}
.card h2 {
  font-size: 19px;
  margin: 0 0 12px;
  padding-left: 12px;
  border-left: 4px solid var(--brand);
}
.card h3 { font-size: 16px; margin: 18px 0 8px; color: var(--ink-2); }
.card p { margin: 10px 0; color: var(--ink-2); }
.card ul { margin: 10px 0; padding-left: 22px; color: var(--ink-2); }
.card li { margin: 6px 0; }

.note {
  background: var(--brand-soft);
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 14px;
  color: var(--brand-dark);
  margin: 14px 0;
}
.warn {
  background: #fff6e6;
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 14px;
  color: #9a6a00;
  margin: 14px 0;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 14px 0;
}
.contact-item {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
  background: #fbfdfe;
}
.contact-item .k { font-size: 12px; color: var(--ink-3); margin-bottom: 4px; }
.contact-item .v { font-size: 15px; color: var(--ink); font-weight: 600; word-break: break-all; }

.faq-item {
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
}
.faq-item:last-child { border-bottom: none; }
.faq-q { font-weight: 600; color: var(--ink); }
.faq-a { color: var(--ink-2); font-size: 15px; margin-top: 6px; }

.footer {
  text-align: center;
  color: var(--ink-3);
  font-size: 12px;
  padding: 30px 18px 40px;
  line-height: 1.8;
}

/* WKWebView 阅读到底按钮（供原生注入判断） */
#readBottomBtn {
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  bottom: 22px;
  width: calc(100% - 36px);
  max-width: 360px;
  padding: 14px;
  border: none;
  border-radius: 999px;
  background: var(--brand);
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  box-shadow: 0 6px 20px rgba(47,184,168,.35);
  opacity: .5;
  pointer-events: none;
  transition: opacity .2s;
}
#readBottomBtn:enabled {
  opacity: 1;
  pointer-events: auto;
  cursor: pointer;
}
#readBottomBtn:disabled { filter: grayscale(.4); }