/* ============================================================
   chinatour.app — design system
   Single stylesheet, no dependencies, no external fonts.
   ============================================================ */

:root{
  /* --- colour --- */
  --ink:#1B1A17;
  --ink-2:#4A463F;
  --muted:#7A736A;
  --brand:#8C3B2E;
  --brand-dark:#6E2D22;
  --brand-soft:#F8EDE9;
  --accent:#B98A45;
  --accent-soft:#FBF4E6;
  --bg:#FCFAF7;
  --surface:#F4F0E9;
  --border:#E3DCD1;
  --border-strong:#CEC5B7;
  --white:#fff;
  --ok:#2F6B4F;
  --ok-soft:#EBF4EF;
  --warn-soft:#FDF3E3;
  --warn-border:#E2C48A;

  /* --- type --- */
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;
  --serif:ui-serif,Georgia,Cambria,"Times New Roman",serif;

  /* --- metrics --- */
  --narrow:720px;
  --wide:1040px;
  --r:10px;
  --r-lg:14px;
  --pad:clamp(16px,4vw,24px);
}

*,*::before,*::after{box-sizing:border-box}

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

body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}

img{max-width:100%;height:auto;display:block}

a{color:var(--brand);text-decoration-thickness:1px;text-underline-offset:2px}
a:hover{color:var(--brand-dark)}

:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:3px}

.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* ------------------------------------------------------------
   Layout
   ------------------------------------------------------------ */
.wrap{max-width:var(--narrow);margin:0 auto;padding:0 var(--pad)}
.wrap-wide{max-width:var(--wide);margin:0 auto;padding:0 var(--pad)}
main{display:block;padding-bottom:56px}
section{margin:0 0 40px}

/* ------------------------------------------------------------
   Header
   ------------------------------------------------------------ */
.site-head{
  background:var(--white);
  border-bottom:1px solid var(--border);
  position:sticky;top:0;z-index:20;
}
.site-head .wrap-wide{
  display:flex;align-items:center;gap:20px;
  min-height:62px;
}
.brand{
  font-family:var(--serif);
  font-size:20px;font-weight:700;letter-spacing:-.01em;
  color:var(--ink);text-decoration:none;white-space:nowrap;
  display:flex;align-items:center;gap:8px;
  min-height:44px;
}
.brand:hover{color:var(--brand)}
.brand .dot{
  width:9px;height:9px;border-radius:50%;
  background:var(--brand);flex:none;
}
.site-nav{
  margin-left:auto;
  display:flex;gap:4px;
  overflow-x:auto;
  scrollbar-width:none;
  -webkit-overflow-scrolling:touch;
}
.site-nav::-webkit-scrollbar{display:none}
.site-nav a{
  display:flex;align-items:center;
  min-height:44px;
  padding:8px 12px;border-radius:8px;
  font-size:15px;color:var(--ink-2);text-decoration:none;white-space:nowrap;
}
.site-nav a:hover{background:var(--surface);color:var(--brand)}
.site-nav a[aria-current="page"]{color:var(--brand);font-weight:600}

/* ------------------------------------------------------------
   Breadcrumb + page meta
   ------------------------------------------------------------ */
.crumbs{
  font-size:14px;color:var(--muted);
  padding:20px 0 0;
}
.crumbs a{
  color:var(--muted);text-decoration:none;
  display:inline-flex;align-items:center;min-height:44px;
}
.crumbs a:hover{color:var(--brand);text-decoration:underline}
.crumbs span{margin:0 7px;opacity:.5}

.meta{
  font-size:14px;color:var(--muted);
  display:flex;flex-wrap:wrap;gap:6px 16px;
  margin-top:14px;
}
.meta strong{font-weight:600;color:var(--ink-2)}

/* ------------------------------------------------------------
   Headings
   ------------------------------------------------------------ */
h1{
  font-family:var(--serif);
  font-size:clamp(28px,5vw,38px);
  line-height:1.2;letter-spacing:-.015em;
  margin:14px 0 0;
}
h2{
  font-family:var(--serif);
  font-size:clamp(22px,3.4vw,27px);
  line-height:1.28;letter-spacing:-.01em;
  margin:0 0 14px;
}
h3{font-size:19px;line-height:1.4;margin:28px 0 8px}
.lede{font-size:19px;line-height:1.65;color:var(--ink-2);margin:16px 0 0}

/* ------------------------------------------------------------
   Prose
   ------------------------------------------------------------ */
.prose p{margin:0 0 18px}
/* Inline links keep their line box but gain a taller hit area — vertical padding
   on an inline element does not affect line height, so this is visually free. */
.prose a{padding-block:5px}
.prose ul,.prose ol{margin:0 0 18px;padding-left:24px}
.prose li{margin:0 0 8px}
.prose li>ul,.prose li>ol{margin-top:8px}
.prose strong{font-weight:650}
.prose hr{border:0;border-top:1px solid var(--border);margin:36px 0}
.prose h2{margin-top:44px}
.prose h2:first-child{margin-top:0}

/* ------------------------------------------------------------
   Quick answer callout
   ------------------------------------------------------------ */
.answer{
  background:var(--brand-soft);
  border:1px solid #EAD6CF;
  border-left:4px solid var(--brand);
  border-radius:var(--r-lg);
  padding:20px 22px;
  margin:28px 0;
}
.answer .label{
  display:block;
  font-size:13px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;
  color:var(--brand);margin-bottom:8px;
}
.answer p{margin:0;font-size:17px;line-height:1.7}

/* ------------------------------------------------------------
   Notes
   ------------------------------------------------------------ */
.note,.warn{
  border-radius:var(--r);
  padding:16px 18px;margin:24px 0;
  font-size:16px;line-height:1.7;
}
.note{background:var(--surface);border:1px solid var(--border)}
.warn{background:var(--warn-soft);border:1px solid var(--warn-border)}
.note p:last-child,.warn p:last-child{margin-bottom:0}
.note .label,.warn .label{
  display:block;font-size:13px;font-weight:700;letter-spacing:.05em;
  text-transform:uppercase;margin-bottom:6px;
}
.note .label{color:var(--muted)}
.warn .label{color:#8A6218}

/* ------------------------------------------------------------
   Steps
   ------------------------------------------------------------ */
.steps{counter-reset:step;list-style:none;padding:0;margin:0 0 24px}
.steps>li{
  counter-increment:step;
  position:relative;
  padding:0 0 4px 46px;
  margin:0 0 26px;
}
.steps>li::before{
  content:counter(step);
  position:absolute;left:0;top:1px;
  width:30px;height:30px;border-radius:50%;
  background:var(--brand);color:var(--white);
  font-size:15px;font-weight:700;line-height:30px;text-align:center;
  font-family:var(--sans);
}
.steps>li>strong:first-child{display:block;font-size:18px;margin-bottom:2px}

/* ------------------------------------------------------------
   Checklist (printable)
   ------------------------------------------------------------ */
.checklist{
  background:var(--white);
  border:1px solid var(--border);
  border-radius:var(--r-lg);
  padding:20px 22px;margin:24px 0;
}
.checklist h3{margin-top:0}
.checklist ul{list-style:none;padding:0;margin:0}
.checklist li{
  position:relative;
  padding:7px 0 7px 34px;
  border-bottom:1px solid var(--border);
  font-size:16px;line-height:1.6;
}
.checklist li:last-child{border-bottom:0}
.checklist li::before{
  content:"";
  position:absolute;left:0;top:11px;
  width:19px;height:19px;
  border:1.5px solid var(--border-strong);border-radius:4px;
  background:var(--white);
}
.checklist li .hint{color:var(--muted);font-size:15px;display:block}

/* ------------------------------------------------------------
   Tables
   ------------------------------------------------------------ */
.table-wrap{
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
  margin:24px 0;
  border:1px solid var(--border);
  border-radius:var(--r-lg);
  background:var(--white);
}
table{border-collapse:collapse;width:100%;font-size:16px;min-width:480px}
caption{
  caption-side:top;text-align:left;
  padding:14px 18px 0;font-size:14px;color:var(--muted);
}
th,td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--border)}
th{
  background:var(--surface);
  font-size:14px;font-weight:700;letter-spacing:.02em;
  color:var(--ink-2);white-space:nowrap;
}
tbody tr:last-child td{border-bottom:0}
td strong{font-weight:650}

/* ------------------------------------------------------------
   CTA / affiliate box
   ------------------------------------------------------------ */
.cta{
  background:var(--white);
  border:1px solid var(--border-strong);
  border-radius:var(--r-lg);
  padding:20px 22px;margin:28px 0;
}
.cta .label{
  display:block;font-size:13px;font-weight:700;letter-spacing:.06em;
  text-transform:uppercase;color:var(--accent);margin-bottom:8px;
}
.cta h3{margin:0 0 6px;font-size:18px}
.cta p{margin:0 0 14px;font-size:16px;color:var(--ink-2)}
.cta .btn{
  display:inline-block;
  background:var(--brand);color:var(--white);
  padding:11px 20px;border-radius:8px;
  font-size:16px;font-weight:600;text-decoration:none;
  min-height:44px;
}
.cta .btn:hover{background:var(--brand-dark);color:var(--white)}
.cta .fine{font-size:13px;color:var(--muted);margin:12px 0 0}

/* ------------------------------------------------------------
   FAQ
   ------------------------------------------------------------ */
.faq{margin:24px 0}
.faq details{
  border-bottom:1px solid var(--border);
  padding:0;
}
.faq details:first-of-type{border-top:1px solid var(--border)}
.faq summary{
  cursor:pointer;
  padding:16px 30px 16px 0;
  font-size:17px;font-weight:600;line-height:1.5;
  position:relative;list-style:none;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{
  content:"+";
  position:absolute;right:4px;top:15px;
  font-size:22px;font-weight:400;color:var(--muted);
  line-height:1;
}
.faq details[open] summary::after{content:"\2013"}
.faq details p{margin:0 0 18px;font-size:16px;color:var(--ink-2)}

/* ------------------------------------------------------------
   Cards / hub grid
   ------------------------------------------------------------ */
.cards{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  gap:14px;
  margin:24px 0;
}
.card{
  display:block;
  background:var(--white);
  border:1px solid var(--border);
  border-radius:var(--r-lg);
  padding:18px 20px;
  text-decoration:none;color:inherit;
}
.card:hover{border-color:var(--border-strong);color:inherit}
.card .k{
  display:block;font-size:13px;font-weight:700;letter-spacing:.05em;
  text-transform:uppercase;color:var(--accent);margin-bottom:6px;
}
.card h3{margin:0 0 4px;font-size:17px;color:var(--ink)}
.card p{margin:0;font-size:15px;color:var(--muted);line-height:1.55}

/* ------------------------------------------------------------
   Hero (homepage)
   ------------------------------------------------------------ */
.hero{
  background:var(--white);
  border-bottom:1px solid var(--border);
  padding:48px 0 40px;
}
.hero h1{margin-top:0;max-width:16ch}
.hero .lede{max-width:56ch}

/* ------------------------------------------------------------
   Author box
   ------------------------------------------------------------ */
.author{
  display:flex;gap:16px;align-items:flex-start;
  background:var(--surface);
  border-radius:var(--r-lg);
  padding:18px 20px;margin:40px 0 0;
}
.author .avatar{
  width:52px;height:52px;border-radius:50%;flex:none;
  background:var(--brand);color:var(--white);
  font-family:var(--serif);font-size:20px;font-weight:700;
  display:flex;align-items:center;justify-content:center;
}
.author .who{font-weight:700;font-size:16px}
.author p{margin:2px 0 0;font-size:15px;color:var(--muted);line-height:1.6}

/* ------------------------------------------------------------
   Footer
   ------------------------------------------------------------ */
.site-foot{
  background:var(--white);
  border-top:1px solid var(--border);
  padding:36px 0 44px;
  margin-top:56px;
  font-size:15px;
  color:var(--muted);
}
.site-foot .cols{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(180px,1fr));
  gap:28px;
  margin-bottom:28px;
}
.site-foot h4{
  font-size:13px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;
  color:var(--ink-2);margin:0 0 10px;
}
.site-foot ul{list-style:none;padding:0;margin:0}
.site-foot li{margin:0 0 8px}
.site-foot a{color:var(--muted);text-decoration:none}
.site-foot a:hover{color:var(--brand);text-decoration:underline}
.site-foot .legal{
  border-top:1px solid var(--border);
  padding-top:22px;
  font-size:14px;line-height:1.65;
}
.site-foot .legal p{margin:0 0 10px}

/* ------------------------------------------------------------
   Touch targets — every discrete control gets a 44px minimum.
   Inline links inside body copy are exempt (WCAG 2.5.8 "inline"
   exception): they are constrained by the line-height of the text
   around them, and forcing them to 44px would break reading.
   ------------------------------------------------------------ */
@media (max-width:640px){
  /* Brand on its own row, nav on a second row — four items do not fit beside
     the logo at 390px, and a half-visible nav hides links people need. */
  .site-head .wrap-wide{flex-wrap:wrap;gap:0;padding-top:2px;padding-bottom:2px}
  .brand{flex:1 1 100%}
  .site-nav{margin-left:0;flex:1 1 100%}
  .site-nav a{padding:8px 10px;font-size:14px}

  .site-foot li{margin:0}
  .site-foot a{display:flex;align-items:center;min-height:44px}
}

/* ------------------------------------------------------------
   Print — the checklist should come out clean
   ------------------------------------------------------------ */
@media print{
  .site-head,.site-foot,.cta,.site-nav{display:none}
  body{background:#fff;font-size:12pt}
  .checklist,.answer{border:1px solid #999;background:#fff}
  .checklist li::before{border-color:#333}
  a{color:#000;text-decoration:none}
  h1{font-size:20pt}
}