:root {
  --teal: #0f766e;
  --teal-dark: #0b5c56;
  --ink: #1f2937;
  --muted: #6b7280;
  --line: #e5e7eb;
  --bg: #f7fafc;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.75;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 0 18px; }
header.hero {
  background: linear-gradient(135deg, var(--teal), var(--teal-dark));
  color: #fff; padding: 40px 0 34px;
}
.hero .logo {
  display: inline-flex; align-items: center; gap: 12px; margin-bottom: 10px;
}
.hero .mark {
  width: 52px; height: 52px; border-radius: 14px; background: rgba(255,255,255,.16);
  display: flex; align-items: center; justify-content: center; font-size: 26px;
}
.hero h1 { font-size: 26px; margin: 0; letter-spacing: 1px; }
.hero p.sub { margin: 6px 0 0; opacity: .92; font-size: 15px; }
.hero .tagline { margin: 16px 0 0; font-size: 16px; opacity: .96; }
main { padding: 26px 0 10px; }
section { margin-bottom: 26px; }
h2 { font-size: 19px; margin: 0 0 12px; padding-left: 11px; border-left: 4px solid var(--teal); line-height: 1.3; }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: 14px;
  padding: 18px 18px 14px; box-shadow: 0 1px 2px rgba(16,24,40,.04);
}
ul.feat { list-style: none; padding: 0; margin: 0; }
ul.feat li { padding: 7px 0 7px 26px; position: relative; border-bottom: 1px dashed var(--line); }
ul.feat li:last-child { border-bottom: 0; }
ul.feat li::before { content: "🐉"; position: absolute; left: 0; top: 7px; font-size: 14px; }
.btnrow { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 6px; }
.btn {
  display: inline-block; text-decoration: none; font-weight: 600; font-size: 15px;
  padding: 12px 20px; border-radius: 10px; border: 1px solid transparent;
}
.btn.primary { background: var(--teal); color: #fff; }
.btn.ghost { background: #fff; color: var(--teal); border-color: var(--teal); }
.btn[disabled], .btn.disabled { background: #e5e7eb; color: #9ca3af; cursor: not-allowed; }
.muted { color: var(--muted); font-size: 14px; }
.links a { color: var(--teal); text-decoration: none; font-weight: 600; }
.links a:hover { text-decoration: underline; }
footer {
  border-top: 1px solid var(--line); margin-top: 30px; padding: 22px 0 40px;
  color: var(--muted); font-size: 13px; text-align: center; line-height: 1.9;
}
footer a { color: var(--muted); }
.disclaimer {
  background: #fff7ed; border: 1px solid #fed7aa; color: #9a3412;
  border-radius: 12px; padding: 13px 15px; font-size: 14px; line-height: 1.7;
}
/* 文档页（隐私政策 / 用户协议） */
.doc { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 24px 22px; }
.doc h1 { font-size: 22px; margin: 0 0 6px; }
.doc h2 { font-size: 17px; border-left: 4px solid var(--teal); margin: 22px 0 10px; }
.doc h3 { font-size: 15.5px; margin: 18px 0 8px; }
.doc p { margin: 8px 0; }
.doc ul { margin: 8px 0; padding-left: 22px; }
.doc li { margin: 4px 0; }
.doc table { border-collapse: collapse; width: 100%; margin: 10px 0; font-size: 14px; }
.doc th, .doc td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
.doc th { background: #f3f4f6; }
.doc .meta { color: var(--muted); font-size: 13.5px; margin-bottom: 14px; }
.backlink { display: inline-block; margin: 4px 0 18px; color: var(--teal); text-decoration: none; font-weight: 600; }
.note { background: #f0fdfa; border: 1px solid #99f6e4; border-radius: 10px; padding: 12px 14px; font-size: 14px; }