:root {
  --ink: #2a2622;
  --muted: #7a716a;
  --line: #e2d9cc;
  --paper: #fbf8f2;
  --bg: #efe9de;
  --accent: #8a6d3b;
  --accent-dark: #6f5629;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", STSong, SimSun, serif;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }

/* 顶栏 */
.bar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px 40px; border-bottom: 1px solid var(--line);
  background: rgba(251, 248, 242, .9); backdrop-filter: blur(8px);
  position: sticky; top: 0; z-index: 10;
}
.brand { font-size: 19px; letter-spacing: .2em; font-weight: 700; text-decoration: none; }
.brand span { color: var(--accent); }
.bar nav a { margin-left: 28px; font-size: 13.5px; color: var(--muted); text-decoration: none; letter-spacing: .1em; }
.bar nav a:hover { color: var(--ink); }

main { max-width: 1080px; margin: 0 auto; padding: 0 32px 40px; }

/* 首屏 */
.hero {
  display: grid; grid-template-columns: 1.15fr .85fr; gap: 52px;
  padding: 64px 0 56px; align-items: start;
}
.intro h1 {
  margin: 0 0 20px; font-size: 40px; line-height: 1.5; letter-spacing: .1em; font-weight: 700;
}
.lead { margin: 0 0 26px; font-size: 15.5px; color: #5f5445; max-width: 520px; }
.points { list-style: none; margin: 0; padding: 0; }
.points li {
  font-size: 14px; color: #5f5445; padding: 9px 0 9px 18px;
  border-left: 2px solid var(--line); margin-bottom: 6px;
}
.points b { color: var(--accent); font-weight: 700; letter-spacing: .06em; }

/* 表单卡片 */
.card {
  background: var(--paper); border: 1px solid var(--line);
  padding: 30px 30px 24px; box-shadow: 0 14px 40px rgba(80, 60, 35, .08);
}
.field { margin-bottom: 16px; }
.field label {
  display: block; font-size: 12.5px; color: var(--muted);
  letter-spacing: .12em; margin-bottom: 6px;
}
.field label span { color: #a89c8c; font-size: 11.5px; letter-spacing: 0; margin-left: 6px; }
.field input, .field select {
  width: 100%; padding: 10px 12px; font-size: 15px; font-family: inherit;
  color: var(--ink); background: #fff; border: 1px solid var(--line); outline: none;
  transition: border-color .15s;
}
.field input:focus, .field select:focus { border-color: var(--accent); }
.row { display: grid; grid-template-columns: 1fr 110px; gap: 10px; }
.radio { display: flex; gap: 22px; padding: 6px 0 2px; }
.radio label { display: flex; align-items: center; gap: 6px; font-size: 15px; color: var(--ink); letter-spacing: 0; margin: 0; }
.hint { font-size: 11.5px; color: #a89c8c; margin-top: 7px; line-height: 1.7; }

.btn {
  width: 100%; margin-top: 8px; padding: 12px; font-size: 15.5px; font-family: inherit;
  letter-spacing: .16em; color: #fff; background: var(--accent);
  border: 1px solid var(--accent); cursor: pointer; transition: .18s;
}
.btn:hover { background: var(--accent-dark); border-color: var(--accent-dark); }
.btn:disabled { opacity: .6; cursor: default; }
.err { color: #a33; font-size: 13.5px; margin-top: 10px; min-height: 0; }
.demo { text-align: center; margin-top: 12px; }
.demo a { font-size: 12.5px; color: var(--muted); text-decoration: none; border-bottom: 1px dashed var(--line); }
.demo a:hover { color: var(--accent); }

/* 说明 */
.sect { border-top: 1px solid var(--line); padding: 46px 0 10px; }
.sect h2 { font-size: 21px; letter-spacing: .14em; margin: 0 0 26px; font-weight: 700; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.cards article { background: var(--paper); border: 1px solid var(--line); padding: 24px 24px 20px; }
.cards .no { font-size: 13px; color: var(--accent); letter-spacing: .2em; margin-bottom: 8px; }
.cards h3 { margin: 0 0 10px; font-size: 16px; letter-spacing: .08em; }
.cards p { margin: 0; font-size: 13.5px; color: #6b6156; line-height: 1.9; }

/* FAQ */
details { border-bottom: 1px solid var(--line); padding: 16px 0; }
details summary {
  cursor: pointer; font-size: 15px; letter-spacing: .04em; list-style: none;
  display: flex; justify-content: space-between; align-items: center;
}
details summary::-webkit-details-marker { display: none; }
details summary::after { content: "＋"; color: var(--accent); font-size: 15px; }
details[open] summary::after { content: "－"; }
details p { margin: 12px 0 0; font-size: 14px; color: #6b6156; max-width: 760px; }

footer {
  border-top: 1px solid var(--line); margin-top: 40px; padding: 26px 40px 50px;
  text-align: center; color: #8b8175; font-size: 12px;
}

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 34px; padding: 40px 0 34px; }
  .intro h1 { font-size: 30px; }
  .cards { grid-template-columns: 1fr; }
  main { padding: 0 20px 30px; }
  .bar { padding: 14px 20px; }
  .bar nav a { margin-left: 16px; }
}

/* ---------- 登录 / 账号 / 收银台 ---------- */
.wrap { max-width: 960px; margin: 0 auto; padding: 40px 28px 60px; }
.bar nav .who { font-size: 13px; color: var(--accent); margin-left: 22px; letter-spacing: .06em; }
.bar nav a.on { color: var(--ink); border-bottom: 2px solid var(--accent); padding-bottom: 2px; }

.auth {
  max-width: 420px; margin: 46px auto; background: var(--paper);
  border: 1px solid var(--line); padding: 38px 36px 30px; box-shadow: 0 14px 40px rgba(80,60,35,.08);
}
.auth h1 { margin: 0 0 8px; font-size: 24px; letter-spacing: .16em; }
.auth .sub { margin: 0 0 26px; font-size: 13.5px; color: var(--muted); }
.auth .btn { margin-top: 6px; }
.auth .switch { margin-top: 18px; font-size: 13px; color: var(--muted); text-align: center; }
.auth .switch a { color: var(--accent); }

.account .head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.account h1 { font-size: 26px; letter-spacing: .14em; margin: 0; }
.btn.small { width: auto; padding: 8px 20px; font-size: 13.5px; margin: 0; letter-spacing: .1em; }
.list { border-top: 1px solid var(--line); }
.list .row {
  display: grid; grid-template-columns: 1fr 130px 90px; align-items: center;
  padding: 16px 6px; border-bottom: 1px solid var(--line); text-decoration: none;
  color: var(--ink); transition: background .15s;
}
.list .row:hover { background: #f7f1e4; }
.list .nm { font-size: 16px; font-weight: 600; letter-spacing: .04em; }
.list .dt { color: var(--muted); font-size: 13px; }
.list .st { font-size: 12.5px; color: #a0958a; text-align: right; letter-spacing: .06em; }
.list .st.paid { color: var(--accent); font-weight: 700; }
.empty { padding: 40px 0; color: var(--muted); font-size: 14px; }
.empty a { color: var(--accent); }
.hint { margin-top: 18px; font-size: 12.5px; color: #a0958a; }

.pay { padding-top: 20px; }
.receipt {
  max-width: 470px; margin: 40px auto; background: var(--paper);
  border: 1px solid var(--line); padding: 36px 38px 30px; box-shadow: 0 14px 40px rgba(80,60,35,.08);
}
.receipt .tag { font-size: 12px; letter-spacing: .24em; color: var(--accent); }
.receipt h1 { margin: 8px 0 22px; font-size: 24px; letter-spacing: .12em; }
.line {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 11px 0; border-bottom: 1px dotted var(--line); font-size: 14px;
}
.line span { color: var(--muted); }
.line code { font-size: 12.5px; color: #6b6156; }
.line .price { font-size: 22px; color: var(--accent); letter-spacing: .02em; }
.receipt .btn { margin-top: 26px; }
.receipt .note { margin-top: 16px; font-size: 12px; color: #9a8f80; line-height: 1.8; }

.auth .agree { margin: 14px 0 0; font-size: 11.5px; color: #a0958a; line-height: 1.7; }