/* =========================================================
   沪籍通 — 编辑设计风 (Editorial / Swiss)
   冷灰蓝纸底 · 宋体衬线标题 · 藏青蓝 · 直角发丝线
   ========================================================= */

:root {
  --paper:   #eef1f6;   /* 冷调纸底 */
  --paper-2: #e2e7ee;   /* 面板/次级底 */
  --panel:   #f8fafc;   /* 卡片底(略亮于纸) */
  --ink:     #14213d;   /* 藏青墨 */
  --ink-2:   #5c6577;   /* 次级墨 */
  --line:    #c7cfdb;   /* 发丝线 */
  --line-2:  #d7dee7;
  --accent:      #0f52ba;   /* 藏青蓝强调色 */
  --accent-deep: #0b3d8f;
  --maxw: 1120px;
  --serif: "Songti SC","STSong","Noto Serif SC","Source Han Serif SC","SimSun",Georgia,serif;
  --sans: "PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono: ui-monospace,"SF Mono","Cascadia Code","Roboto Mono",Consolas,monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  border-top: 3px solid var(--accent);
}

a { color: var(--ink); text-decoration: none; }
a:hover { color: var(--accent); }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }

h1, h2, h3, .amount, .num, .plan h3 { font-family: var(--serif); font-weight: 700; letter-spacing: .5px; }

/* ---------- Header ---------- */
header.site {
  position: sticky; top: 0; z-index: 50;
  background: rgba(238,241,246,.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--ink);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.logo { font-family: var(--serif); font-weight: 700; font-size: 24px; letter-spacing: 1px; color: var(--ink); }
.logo span { color: var(--accent); }
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a { color: var(--ink-2); font-size: 14px; font-family: var(--sans); }
.nav-links a:hover { color: var(--ink); }
.nav-links a.btn { color: #fff; }

.btn {
  display: inline-block; padding: 13px 26px; border-radius: 0;
  background: var(--ink); color: var(--paper); font-weight: 600; font-size: 14px;
  letter-spacing: 1px; border: 1px solid var(--ink); cursor: pointer;
  transition: background .18s ease, color .18s ease;
}
.btn:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.ghost { background: transparent; color: var(--ink); }
.btn.ghost:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
@media (max-width: 760px){ .nav-links a:not(.btn){ display:none; } }

/* ---------- Skip link ---------- */
.skip-link { position:absolute; left:-9999px; top:0; background:var(--ink); color:var(--paper); padding:10px 16px; z-index:100; }
.skip-link:focus { left:0; }

/* ---------- Hero ---------- */
.hero { padding: 96px 0 72px; border-bottom: 1px solid var(--ink); }
.eyebrow {
  display:inline-flex; align-items:center; gap:10px;
  font-family: var(--mono); font-size:12px; letter-spacing:2px; text-transform:uppercase;
  color: var(--accent); margin-bottom: 30px;
}
.eyebrow::before { content:""; width:28px; height:1px; background:var(--accent); }
.hero h1 { font-size: clamp(40px, 7vw, 82px); line-height: 1.06; margin-bottom: 28px; max-width: 15ch; }
.hero h1 .accent-word { color: var(--accent); position: relative; white-space: nowrap; }
.hero h1 .accent-word::after {
  content:""; position:absolute; left:0; right:0; bottom:.08em; height:.12em;
  background: var(--accent); opacity:.35;
}
.hero p.lead { font-size: clamp(17px, 2.2vw, 21px); color: var(--ink-2); max-width: 60ch; margin-bottom: 38px; }
.hero-cta { display:flex; gap:16px; flex-wrap:wrap; }
.updated { color: var(--ink-2); font-size:13px; font-family:var(--mono); letter-spacing:.5px; margin-top:26px; }

/* ---------- Engines strip ---------- */
.engines { padding: 26px 0; border-bottom: 1px solid var(--line); background: var(--paper-2); }
.engines p { text-align:center; color:var(--ink-2); font-size:12px; font-family:var(--mono); letter-spacing:2px; text-transform:uppercase; margin-bottom:12px; }
.engine-list { display:flex; flex-wrap:wrap; gap:10px 22px; justify-content:center; align-items:center; }
.engine-list span { font-family:var(--serif); font-size:17px; color:var(--ink); }
.engine-list span + span::before { content:"·"; color:var(--accent); margin-right:22px; }

/* ---------- Sections ---------- */
section { padding: 88px 0; border-bottom: 1px solid var(--line); }
.alt { background: var(--paper-2); }
.section-head { max-width: 760px; margin-bottom: 52px; }
.sec-index {
  font-family: var(--mono); font-size:13px; letter-spacing:2px; color: var(--accent);
  display:flex; align-items:center; gap:14px; margin-bottom:20px; text-transform:uppercase;
}
.sec-index b { color: var(--ink); font-weight:400; }
.sec-index::after { content:""; flex:1; height:1px; background:var(--line); max-width:180px; }
.section-head h2 { font-size: clamp(28px, 4vw, 44px); line-height:1.15; margin-bottom:16px; }
.section-head p { color: var(--ink-2); font-size:18px; }

/* ---------- Grid & cards ---------- */
.grid { display:grid; gap:0; border-top:1px solid var(--ink); }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid.cols-6 { grid-template-columns: repeat(6, 1fr); }
@media (max-width: 860px){ .grid.cols-3, .grid.cols-4, .grid.cols-6 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px){ .grid.cols-3, .grid.cols-4, .grid.cols-2, .grid.cols-6 { grid-template-columns: 1fr; } }

/* 卡片用共享边线拼成网格,像报纸分栏 */
.card {
  background: transparent; padding: 30px 28px 34px;
  border-right:1px solid var(--line); border-bottom:1px solid var(--line);
  transition: background .18s ease;
}
.card:hover { background: var(--panel); }
.grid.cols-3 .card:nth-child(3n), .grid.cols-4 .card:nth-child(4n), .grid.cols-2 .card:nth-child(2n), .grid.cols-6 .card:nth-child(6n) { border-right:none; }
.card .idx { font-family:var(--mono); font-size:14px; color:var(--accent); font-weight:700; letter-spacing:1px; display:block; margin-bottom:16px; }
.card h3 { font-size:20px; margin-bottom:10px; }
.card p { color:var(--ink-2); font-size:15px; }
.card .source { margin-top:10px; }
.step-num { font-family:var(--mono); color:var(--accent); font-weight:700; font-size:13px; letter-spacing:1px; margin-bottom:10px; }

/* ---------- Answer-first box ---------- */
.answer-box { border-left:3px solid var(--accent); background: var(--panel); padding:26px 30px; max-width:860px; margin-bottom:34px; }
.answer-box .q { font-family:var(--mono); color:var(--accent); font-size:12px; font-weight:700; letter-spacing:2px; text-transform:uppercase; margin-bottom:10px; }
.answer-box p { font-size:19px; font-family:var(--serif); line-height:1.7; color:var(--ink); }
.answer-box strong { color:var(--accent); }

/* ---------- Comparison table ---------- */
.table-wrap { max-width:100%; overflow-x:auto; }
table.cmp { width:100%; border-collapse:collapse; font-size:15px; border-top:2px solid var(--ink); border-bottom:2px solid var(--ink); }
table.cmp th, table.cmp td { padding:15px 18px; text-align:left; border-bottom:1px solid var(--line); vertical-align:top; }
table.cmp thead th { font-family:var(--mono); font-size:12px; letter-spacing:1px; text-transform:uppercase; border-bottom:1px solid var(--ink); }
table.cmp th:first-child { color:var(--ink-2); font-weight:600; font-family:var(--sans); }
table.cmp .col-accent { color:var(--accent); font-weight:600; }
table.cmp tbody tr:last-child td { border-bottom:none; }
.source { color:var(--ink-2); font-size:13px; margin-top:12px; font-style:italic; }
.source a { color:var(--ink-2); text-decoration:underline; }

/* ---------- Stats ---------- */
.stats { display:grid; grid-template-columns: repeat(4,1fr); }
@media (max-width:560px){ .stats{ grid-template-columns:1fr 1fr; } }
.stat { padding:20px 24px; border-left:1px solid var(--line); }
.stat:first-child { border-left:none; }
.stat .num { font-size: clamp(34px,5vw,52px); color:var(--accent); line-height:1; }
.stat .lbl { color:var(--ink-2); font-size:14px; margin-top:12px; }
.stat .src { display:block; color:var(--ink-2); font-size:11px; font-family:var(--mono); margin-top:6px; opacity:.8; }

/* ---------- Differentiators ---------- */
.diff-list { display:grid; grid-template-columns:repeat(2,1fr); border-top:1px solid var(--ink); }
@media (max-width:640px){ .diff-list{ grid-template-columns:1fr; } }
.diff { display:flex; gap:16px; align-items:flex-start; padding:26px 28px; border-right:1px solid var(--line); border-bottom:1px solid var(--line); }
.diff:nth-child(2n){ border-right:none; }
.diff .check { font-family:var(--serif); color:var(--accent); font-size:26px; line-height:1; flex-shrink:0; }
.diff h3 { font-size:17px; margin-bottom:6px; }
.diff p { color:var(--ink-2); font-size:14px; }

/* ---------- About / E-E-A-T ---------- */
.about-grid { display:grid; grid-template-columns: 1.3fr 1fr; gap:0; border-top:1px solid var(--ink); }
@media (max-width:780px){ .about-grid{ grid-template-columns:1fr; } }
.about-text { padding:34px 40px 34px 0; }
@media (max-width:780px){ .about-text{ padding:30px 0; } }
.about-text p { color:var(--ink-2); margin-bottom:16px; font-size:16px; }
.about-text p strong { color:var(--ink); }
.founder { padding:34px 0 34px 40px; border-left:1px solid var(--line); }
@media (max-width:780px){ .founder{ border-left:none; border-top:1px solid var(--line); padding:30px 0; } }
.founder .avatar { width:60px; height:60px; border-radius:50%; background:var(--accent); display:flex; align-items:center; justify-content:center; font-family:var(--serif); font-size:26px; color:#fff; margin-bottom:16px; }
.founder h3 { font-size:19px; margin-bottom:2px; }
.founder .role { font-family:var(--mono); color:var(--accent); font-size:13px; letter-spacing:1px; margin-bottom:12px; }
.founder p { color:var(--ink-2); font-size:14px; }

/* ---------- Pricing ---------- */
.price-grid { display:grid; grid-template-columns: repeat(3,1fr); border-top:1px solid var(--ink); border-left:1px solid var(--line); }
@media (max-width:860px){ .price-grid{ grid-template-columns:1fr; max-width:440px; border-left:none; } }
.plan { padding:34px 30px; border-right:1px solid var(--line); border-bottom:1px solid var(--line); display:flex; flex-direction:column; background:transparent; }
@media (max-width:860px){ .plan{ border-right:none; } }
.plan.featured { background: var(--panel); position:relative; }
.plan.featured::before { content:"最受欢迎"; position:absolute; top:0; right:0; background:var(--accent); color:#fff; font-family:var(--mono); font-size:11px; letter-spacing:1px; padding:5px 12px; }
.plan h3 { font-size:22px; margin-bottom:6px; }
.plan .tag { color:var(--ink-2); font-size:14px; min-height:42px; }
.plan .amount { font-size:38px; margin:16px 0 4px; color:var(--ink); }
.plan .amount small { font-size:15px; color:var(--ink-2); font-weight:400; font-family:var(--sans); }
.plan ul { list-style:none; margin:20px 0 26px; }
.plan li { padding:9px 0; border-bottom:1px solid var(--line-2); color:var(--ink); font-size:15px; }
.plan li::before { content:"— "; color:var(--accent); }
.plan .btn { margin-top:auto; text-align:center; }

/* ---------- FAQ ---------- */
.faq { max-width:800px; border-top:1px solid var(--ink); }
.faq details { border-bottom:1px solid var(--line); padding:20px 4px; cursor:pointer; }
.faq summary { font-family:var(--serif); font-weight:700; font-size:19px; list-style:none; display:flex; justify-content:space-between; align-items:center; gap:20px; }
.faq summary::-webkit-details-marker { display:none; }
.faq summary::after { content:"+"; font-family:var(--mono); color:var(--accent); font-size:24px; font-weight:400; }
.faq details[open] summary::after { content:"−"; }
.faq details p { color:var(--ink-2); margin-top:14px; font-size:15px; }

/* ---------- CTA / Contact ---------- */
.cta-band { text-align:center; border:2px solid var(--ink); padding:56px 28px; background:var(--panel); }
.cta-band h2 { font-size: clamp(26px,3.6vw,40px); margin-bottom:14px; }
.cta-band p { color:var(--ink-2); margin-bottom:30px; font-size:17px; }
.qr-side { border:1px solid var(--line); padding:30px; text-align:center; display:flex; flex-direction:column; align-items:center; background:var(--paper); }
.qr-side h3 { font-size:20px; margin-bottom:6px; }
.qr-side p { color:var(--ink-2); font-size:14px; margin-bottom:20px; }
.qr-img { width:200px; height:200px; max-width:100%; object-fit:contain; display:block; border:1px solid var(--line); }
.qr-placeholder { width:200px; height:200px; background:var(--paper-2); border:1px dashed var(--line); display:flex; align-items:center; justify-content:center; color:var(--ink-2); font-size:13px; text-align:center; padding:16px; line-height:1.7; }
.qr-side .wx { margin-top:16px; color:var(--ink); font-size:14px; font-family:var(--mono); }
.qr-side .wx b { color:var(--accent); }
.qr-solo { max-width:340px; margin:0 auto; }

/* ---------- Disclaimer ---------- */
.disclaimer { max-width:860px; background:var(--panel); border:1px dashed var(--line); padding:20px 24px; font-size:13.5px; color:var(--ink-2); margin-top:30px; }
.disclaimer b { color:var(--ink); }

/* ---------- Footer ---------- */
footer.site { padding:48px 0 40px; color:var(--ink-2); font-size:14px; background:var(--ink); }
footer.site, footer.site a { color:#c4cbdc; }
footer.site .logo { color:#eef1f6; }
footer.site .logo span { color:var(--accent); }
.foot-grid { display:flex; justify-content:space-between; flex-wrap:wrap; gap:24px; }
.foot-links { display:flex; gap:22px; flex-wrap:wrap; }
.foot-links a { font-family:var(--mono); font-size:13px; }
footer.site a:hover { color:#fff; }

/* ---------- utilities ---------- */
.center { text-align:center; }
.narrow { max-width:860px; }