/* 准批 ZhunPi — editorial / printed-document aesthetic. Flat: no soft-gradient washes, no glow, no glass. */
:root{
  --paper:#FAF7F0; --paper-deep:#F3EDDE; --ink:#1C1C1C; --muted:#5B564C; --faint:#8A8478;
  --vermillion:#C8102E; --vermillion-ink:#9C0C24;
  --rule:#DDD5C2; --rule-soft:#EAE3D2;
  --serif:"Songti SC","STSong","Noto Serif SC",Georgia,"Hiragino Sans GB","Microsoft YaHei",serif;
  --sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  --mono:"SF Mono",ui-monospace,Menlo,Consolas,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased}
::selection{background:var(--vermillion);color:#fff}
a{color:var(--vermillion);text-decoration:none}
a:hover{text-decoration:underline}
.en{font-family:var(--sans);font-size:.82em;color:var(--faint);font-weight:400}

/* ---- staging ribbon ---- */
.staging-ribbon{background:var(--ink);color:#F5EFE0;font-size:.78rem;padding:8px 16px;text-align:center;line-height:1.5}
.staging-ribbon b{color:#fff;background:var(--vermillion);padding:1px 8px;border-radius:2px;margin-right:8px;font-size:.72rem;letter-spacing:.08em}
.staging-ribbon .en{color:#B9B2A2;display:block}

/* ---- masthead ---- */
.brand-nav{border-bottom:2px solid var(--ink);background:var(--paper)}
.nav-inner{max-width:1080px;margin:0 auto;padding:14px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.brand-lock{display:flex;align-items:center;gap:12px;color:var(--ink)}
.brand-lock:hover{text-decoration:none}
.brand-mark{width:40px;height:40px;flex:none}
.brand-name{font-family:var(--serif);font-size:1.35rem;font-weight:700;letter-spacing:.06em;display:block;line-height:1.2}
.brand-name small{display:block;font-family:var(--sans);font-size:.62rem;font-weight:600;letter-spacing:.22em;color:var(--muted)}
.nav-links{display:flex;align-items:center;gap:22px;font-size:.88rem}
.nav-links a{color:var(--ink)}
.btn{display:inline-block;background:var(--vermillion);color:#fff;border:2px solid var(--vermillion);padding:11px 26px;font-size:.95rem;font-weight:700;border-radius:3px;line-height:1.4;text-align:center}
.btn:hover{background:var(--vermillion-ink);border-color:var(--vermillion-ink);text-decoration:none;color:#fff}
.btn.ghost{background:transparent;border:2px solid var(--ink);color:var(--ink)}
.btn.ghost:hover{background:var(--ink);color:var(--paper);text-decoration:none}

/* ---- document hero: masthead + lede ---- */
.hero{border-bottom:2px solid var(--ink);background:var(--paper-deep)}
.hero-inner{max-width:1080px;margin:0 auto;padding:56px 20px 48px;display:grid;grid-template-columns:1fr 260px;gap:44px}
.kicker{display:inline-block;font-family:var(--mono);font-size:.72rem;letter-spacing:.18em;color:var(--vermillion);text-transform:uppercase;margin-bottom:18px;border-left:3px solid var(--vermillion);padding-left:10px}
.hero h1{font-family:var(--serif);font-size:clamp(1.9rem,4.2vw,3rem);line-height:1.35;font-weight:700;margin-bottom:20px;max-width:22em}
.hero h1 .red{color:var(--vermillion)}
.hero .lede{font-size:1.08rem;color:var(--muted);max-width:40em;margin-bottom:16px}
.hero .en-sub{display:block;margin-bottom:26px;max-width:52em}
.hero-ctas{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:8px}
.stamp{justify-self:start;align-self:start;border:3px double var(--vermillion);border-radius:4px;padding:16px 18px;text-align:center;color:var(--vermillion);transform:rotate(-4deg);background:var(--paper);min-width:200px}
.stamp .s1{font-family:var(--serif);font-size:1.5rem;font-weight:700;letter-spacing:.15em;display:block}
.stamp .s2{font-family:var(--mono);font-size:.78rem;display:block;margin-top:6px;letter-spacing:.06em}
.stamp .s3{font-size:.72rem;color:var(--muted);display:block;margin-top:4px}

/* ---- generic document sections ---- */
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.block{padding:52px 0;border-bottom:1px solid var(--rule-soft)}
.block:last-of-type{border-bottom:none}
.sec-head{margin-bottom:30px;max-width:760px}
.sec-head h2{font-family:var(--serif);font-size:clamp(1.4rem,2.6vw,1.9rem);line-height:1.4;font-weight:700;margin-bottom:10px}
.sec-head .lede{color:var(--muted);font-size:1.02rem}

/* decision table (the page that matters) */
.track-table{width:100%;border-collapse:collapse;margin:22px 0;font-size:.95rem}
.track-table th{font-family:var(--serif);font-size:1rem;text-align:left;padding:14px 16px;border-bottom:2px solid var(--ink);background:var(--paper-deep)}
.track-table th .en{display:block}
.track-table td{padding:14px 16px;border-bottom:1px solid var(--rule);vertical-align:top}
.track-table tr:last-child td{border-bottom:2px solid var(--ink)}
.track-table td:first-child{font-weight:700;white-space:nowrap}
.fridge-note{border:1px dashed var(--vermillion);padding:14px 18px;font-size:.9rem;color:var(--muted);margin-top:8px;background:#fff}
.fridge-note b{color:var(--vermillion)}

/* table of contents chapters */
.toc{list-style:none;border-top:2px solid var(--ink)}
.toc li{display:grid;grid-template-columns:64px 1fr;gap:16px;padding:18px 8px;border-bottom:1px solid var(--rule);align-items:baseline}
.toc li:hover{background:#fff}
.toc .ch-no{font-family:var(--serif);font-size:1.6rem;color:var(--vermillion);font-weight:700}
.toc h3{font-size:1.08rem;font-weight:700;margin-bottom:4px}
.toc h3 .en{margin-left:10px}
.toc p{color:var(--muted);font-size:.94rem;max-width:56em}

/* margin-note method box */
.margin-note{border:2px solid var(--ink);background:#fff;padding:28px 30px;position:relative;margin:8px 0}
.margin-note::before{content:"编者注";position:absolute;top:-14px;left:24px;background:var(--vermillion);color:#fff;font-size:.75rem;font-weight:700;letter-spacing:.2em;padding:3px 14px}
.margin-note h3{font-family:var(--serif);font-size:1.3rem;margin-bottom:12px}
.margin-note p{color:var(--muted);margin-bottom:14px;max-width:60em}
.margin-note ul{list-style:none}
.margin-note li{display:flex;gap:12px;padding:10px 0;border-top:1px solid var(--rule-soft);font-size:.94rem}
.margin-note li svg{flex:none;width:18px;height:18px;margin-top:4px}
.margin-note li .en{display:block}

/* scope two-column */
.scope{display:grid;grid-template-columns:1fr 1fr;gap:0;border:2px solid var(--ink)}
.scope-col{padding:26px 28px}
.scope-col:first-child{border-right:2px solid var(--ink);background:#fff}
.scope-col h3{font-family:var(--serif);font-size:1.15rem;margin-bottom:14px}
.scope-col h3 .is{color:var(--vermillion)}
.scope-col h3 .isnt{color:var(--muted)}
.scope-col ul{list-style:none}
.scope-col li{display:flex;gap:10px;padding:8px 0;font-size:.93rem;border-top:1px solid var(--rule-soft)}
.scope-col li svg{flex:none;width:16px;height:16px;margin-top:5px}
.scope-col li .en{display:block}

/* price as an order slip */
.slip{border:2px solid var(--ink);background:#fff;max-width:640px}
.slip-head{background:var(--ink);color:#F5EFE0;padding:12px 24px;font-family:var(--mono);font-size:.78rem;letter-spacing:.14em}
.slip-body{padding:28px}
.slip-body .amt{font-family:var(--serif);font-size:2.4rem;font-weight:700;color:var(--vermillion)}
.slip-body .amt small{font-family:var(--sans);font-size:.85rem;color:var(--muted);font-weight:400}
.slip-body .sub{color:var(--muted);font-size:.93rem;margin:12px 0 20px;max-width:34em}
.slip-body .sub .en{display:block}

/* faq */
.faq details{border-top:1px solid var(--rule);padding:0}
.faq details:last-child{border-bottom:1px solid var(--rule)}
.faq summary{cursor:pointer;list-style:none;font-weight:700;font-size:1.02rem;padding:16px 8px;display:flex;justify-content:space-between;gap:16px;align-items:baseline}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--vermillion);font-size:1.4rem;font-weight:400;flex:none}
.faq details[open] summary::after{content:"–"}
.faq .faq-a{padding:0 8px 20px;color:var(--muted);font-size:.95rem;max-width:58em}
.faq .faq-a .en{display:block;margin-top:6px}

/* closing */
.closing{text-align:left;max-width:760px}
.closing h2{font-family:var(--serif);font-size:clamp(1.5rem,3vw,2.1rem);margin-bottom:14px;line-height:1.4}
.closing p{color:var(--muted);margin-bottom:22px}
.disclaimer{border-top:2px solid var(--ink);margin-top:44px;padding-top:18px;font-size:.82rem;color:var(--faint);max-width:1080px}
.disclaimer b{color:var(--muted)}
.disclaimer .en{display:block}

/* footer */
.brand-footer{border-top:2px solid var(--ink);background:var(--paper-deep)}
.foot-inner{max-width:1080px;margin:0 auto;padding:36px 20px;display:grid;grid-template-columns:2fr 1fr 1fr;gap:32px}
.foot-brand .brand-name{margin-bottom:10px}
.foot-brand p{font-size:.88rem;color:var(--muted)}
.brand-footer h4{font-size:.78rem;letter-spacing:.16em;color:var(--faint);margin-bottom:12px;text-transform:uppercase}
.brand-footer ul{list-style:none}
.brand-footer li{margin-bottom:8px;font-size:.9rem}
.foot-disc{max-width:1080px;margin:0 auto;padding:0 20px 14px;font-size:.8rem;color:var(--faint)}
.foot-base{max-width:1080px;margin:0 auto;padding:14px 20px;border-top:1px solid var(--rule);display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:.8rem;color:var(--faint)}

/* ---- checkout ---- */
.checkout-wrap{max-width:980px;margin:0 auto;padding:36px 20px 60px}
.checkout-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:24px;align-items:start}
.co-card{border:2px solid var(--ink);background:#fff;padding:30px}
.status-pill{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:.72rem;letter-spacing:.14em;background:var(--ink);color:#fff;padding:6px 14px;border-radius:2px;margin-bottom:18px}
.status-pill .dot{width:8px;height:8px;border-radius:50%;background:var(--vermillion)}
.co-card h1{font-family:var(--serif);font-size:1.6rem;line-height:1.4;margin-bottom:10px}
.co-card h1 .en{display:block;font-family:var(--sans);font-size:.85rem;font-weight:400;color:var(--muted);margin-top:6px}
.order-lines{margin:22px 0;border-top:2px solid var(--ink)}
.order-line{display:flex;justify-content:space-between;gap:14px;padding:12px 0;border-bottom:1px solid var(--rule-soft);font-size:.93rem}
.order-line.total{border-bottom:2px solid var(--ink);font-weight:700;font-size:1.05rem}
.order-line .amt{color:var(--vermillion)}
.feat-list{list-style:none;margin:18px 0}
.feat-list li{padding:8px 0 8px 26px;position:relative;font-size:.92rem;border-top:1px solid var(--rule-soft)}
.feat-list li::before{content:"—";position:absolute;left:0;color:var(--vermillion)}
.co-legal{border:1px solid var(--rule);background:var(--paper);padding:14px 16px;font-size:.84rem;color:var(--muted);margin-top:16px}
.co-note{font-size:.86rem;color:var(--muted);margin-bottom:16px}
.field{margin-bottom:16px}
.field label{display:block;font-weight:700;font-size:.9rem;margin-bottom:6px}
.field input{width:100%;padding:12px 14px;border:2px solid var(--ink);border-radius:3px;font-size:1rem;font-family:var(--sans);background:var(--paper)}
.field input:focus{outline:3px solid rgba(200,16,46,.25);border-color:var(--vermillion)}
button.pay{width:100%;background:var(--vermillion);border:none;color:#fff;font-size:1.05rem;font-weight:700;padding:16px;border-radius:3px;cursor:pointer;margin-top:6px}
button.pay:hover{background:var(--vermillion-ink)}
button.pay small{display:block;font-size:.75rem;font-weight:400;opacity:.85;margin-top:4px}
button.pay:disabled{background:var(--faint);cursor:default}
#result{display:none;border:2px solid var(--ink);background:var(--paper-deep);padding:18px;margin-top:18px;font-size:.92rem}
.secure-row{display:flex;justify-content:center;gap:18px;flex-wrap:wrap;font-size:.78rem;color:var(--faint);margin-top:16px;align-items:center}
.secure-row svg{width:14px;height:14px;vertical-align:-2px;margin-right:5px}

@media (max-width:820px){
  .hero-inner{grid-template-columns:1fr}
  .stamp{transform:rotate(-2deg)}
  .scope{grid-template-columns:1fr}
  .scope-col:first-child{border-right:none;border-bottom:2px solid var(--ink)}
  .checkout-grid{grid-template-columns:1fr}
  .foot-inner{grid-template-columns:1fr 1fr}
  .toc li{grid-template-columns:44px 1fr}
}
@media (max-width:560px){
  .nav-links{gap:14px}
  .nav-links a:not(.btn){display:none}
  .foot-inner{grid-template-columns:1fr}
  .track-table{font-size:.85rem}
  .track-table td,.track-table th{padding:10px}
}