/* ==========================================================================
   Xu Lei — Rehabilitation Insights
   Global stylesheet. No external dependencies (works offline / file://).
   ========================================================================== */

:root{
  --navy:#123a52;
  --ink:#0f2436;
  --ink-soft:#3b556a;
  --muted:#6a8093;
  --line:#e3e9ef;
  --line-strong:#cfd9e2;
  --bg:#f5f8fa;
  --surface:#ffffff;
  --surface-alt:#eef4f6;
  --accent:#0d7c74;
  --accent-dark:#0a5f59;
  --accent-soft:#e6f4f2;
  --accent-line:#bfe0dc;
  --warn:#b45309;
  --warn-bg:#fff7ed;
  --warn-line:#f3d3aa;
  --radius:16px;
  --radius-sm:10px;
  --shadow-sm:0 1px 2px rgba(15,36,54,.05), 0 4px 14px rgba(15,36,54,.05);
  --shadow-md:0 8px 28px rgba(15,36,54,.09);
  --header-h:72px;
  --maxw:1120px;
  --font:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}

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

html{scroll-behavior:smooth}

body{
  margin:0;
  font-family:var(--font);
  font-size:17px;
  line-height:1.65;
  color:var(--ink);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

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

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

h1,h2,h3,h4{line-height:1.22;letter-spacing:-.015em;margin:0 0 .5em;color:var(--navy);font-weight:650}
h1{font-size:clamp(1.85rem,1.2rem + 2vw,2.6rem)}
h2{font-size:clamp(1.35rem,1.1rem + .9vw,1.75rem)}
h3{font-size:1.12rem}
p{margin:0 0 1em}
ul,ol{margin:0 0 1em;padding-left:1.15em}
li{margin:.35em 0}

hr{border:0;border-top:1px solid var(--line);margin:2.5rem 0}

.skip-link{
  position:absolute;left:-9999px;top:0;z-index:100;
  background:var(--navy);color:#fff;padding:.7rem 1rem;border-radius:0 0 8px 0
}
.skip-link:focus{left:0}

:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:4px}

/* ---------- layout helpers ---------- */
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}
.narrow{max-width:820px}
.section{padding:72px 0}
.section--tight{padding:48px 0}
.section--alt{background:var(--surface)}
.section--bordered{border-top:1px solid var(--line)}

.section-head{margin-bottom:34px;max-width:760px}
.eyebrow{
  display:inline-block;font-size:.76rem;font-weight:700;letter-spacing:.14em;
  text-transform:uppercase;color:var(--accent-dark);margin-bottom:.55rem
}
.lede{font-size:1.06rem;color:var(--ink-soft);margin:0}
.muted{color:var(--muted)}
.center{text-align:center}

.grid{display:grid;gap:22px}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}

/* ---------- header / nav ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:50;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(160%) blur(10px);
  border-bottom:1px solid var(--line);
  transition:box-shadow .2s ease, background .2s ease;
}
.site-header.is-scrolled{box-shadow:var(--shadow-sm)}
.header-inner{
  height:var(--header-h);display:flex;align-items:center;justify-content:space-between;gap:24px
}

.brand{display:flex;align-items:center;gap:12px;text-decoration:none;flex:0 0 auto}
.brand:hover{text-decoration:none}
.brand-mark{
  width:38px;height:38px;border-radius:11px;flex:0 0 auto;
  background:linear-gradient(150deg,var(--accent),#0b5d6b);
  color:#fff;display:grid;place-items:center;
  font-weight:700;font-size:.9rem;letter-spacing:.04em
}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-name{font-weight:700;color:var(--navy);font-size:1rem;letter-spacing:-.01em}
.brand-role{font-size:.72rem;color:var(--muted);letter-spacing:.06em;text-transform:uppercase}

.nav-toggle{
  display:none;align-items:center;gap:8px;
  background:var(--surface);border:1px solid var(--line-strong);
  border-radius:var(--radius-sm);padding:.5rem .7rem;cursor:pointer;
  font:inherit;font-size:.85rem;color:var(--ink);font-weight:600
}
.nav-toggle-icon{width:18px;height:12px;position:relative;display:block}
.nav-toggle-icon span{
  position:absolute;left:0;right:0;height:2px;background:var(--ink);border-radius:2px;
  transition:transform .2s ease,opacity .2s ease
}
.nav-toggle-icon span:nth-child(1){top:0}
.nav-toggle-icon span:nth-child(2){top:5px}
.nav-toggle-icon span:nth-child(3){top:10px}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

.site-nav ul{display:flex;align-items:center;gap:4px;list-style:none;margin:0;padding:0}
.site-nav a{
  display:block;padding:.55rem .8rem;border-radius:9px;
  font-size:.92rem;font-weight:500;color:var(--ink-soft);text-decoration:none;
  transition:background .15s ease,color .15s ease
}
.site-nav a:hover{background:var(--surface-alt);color:var(--navy);text-decoration:none}
.site-nav a[aria-current="page"]{color:var(--accent-dark);background:var(--accent-soft);font-weight:650}

main{padding-top:var(--header-h)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.5rem;
  padding:.72rem 1.15rem;border-radius:11px;border:1px solid transparent;
  font:inherit;font-size:.94rem;font-weight:600;line-height:1.2;
  cursor:pointer;text-decoration:none;transition:transform .12s ease,box-shadow .18s ease,background .18s ease
}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 6px 18px rgba(13,124,116,.24)}
.btn-primary:hover{background:var(--accent-dark)}
.btn-ghost{background:var(--surface);color:var(--navy);border-color:var(--line-strong)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent-dark)}
.btn-row{display:flex;flex-wrap:wrap;gap:12px}

.link-arrow{font-weight:600;display:inline-flex;align-items:center;gap:.35rem}
.link-arrow::after{content:"\2192";transition:transform .15s ease}
.link-arrow:hover::after{transform:translateX(3px)}

/* ---------- notes / chips ---------- */
.note{
  background:var(--surface-alt);border:1px solid var(--line);
  border-radius:var(--radius-sm);padding:14px 16px;font-size:.92rem;color:var(--ink-soft);
  margin:0
}
.note strong{color:var(--navy)}
.note--accent{background:var(--accent-soft);border-color:var(--accent-line)}
.note--plain{background:transparent}

.zh{
  display:block;margin-top:.15em;color:var(--muted);font-size:.92em;
  word-break:keep-all;overflow-wrap:break-word
}
.zh--inline{display:inline;margin:0;font-size:.95em}

.chip-row{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:0;padding:0}
.chip-row li{margin:0}
.chip{
  display:inline-block;padding:.32rem .7rem;border-radius:999px;
  background:var(--surface);border:1px solid var(--line-strong);
  font-size:.82rem;font-weight:550;color:var(--ink-soft)
}
.chip--accent{background:var(--accent-soft);border-color:var(--accent-line);color:var(--accent-dark)}
button.chip{font-family:inherit;cursor:pointer;transition:background .15s ease,border-color .15s ease,color .15s ease}
button.chip:hover{border-color:var(--accent);color:var(--accent-dark)}

.tag{
  display:inline-block;padding:.25rem .6rem;border-radius:6px;
  background:var(--accent-soft);color:var(--accent-dark);
  font-size:.74rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase
}

/* placeholders that MUST be replaced with confirmed details */
.tbd{
  display:inline-block;padding:1px 8px;border-radius:6px;
  background:var(--warn-bg);border-bottom:1px dashed var(--warn-line);
  color:var(--warn);font-size:.95em;font-weight:600
}

/* ---------- hero ---------- */
.hero{
  background:
    radial-gradient(1100px 420px at 12% -10%, #eaf5f4 0%, rgba(234,245,244,0) 62%),
    linear-gradient(180deg,#ffffff 0%, var(--bg) 100%);
  border-bottom:1px solid var(--line);
  padding:64px 0 68px;
}
.hero-grid{display:grid;grid-template-columns:320px minmax(0,1fr);gap:52px;align-items:center}

.portrait-card{
  position:relative;border-radius:22px;overflow:hidden;background:var(--surface);
  border:1px solid var(--line);box-shadow:var(--shadow-md);
  aspect-ratio:4/5
}
.portrait-card img,.portrait-fallback{width:100%;height:100%;object-fit:cover;object-position:50% 16%}
.portrait-fallback{
  display:grid;place-items:center;gap:10px;text-align:center;padding:24px;
  background:linear-gradient(160deg,#e9f3f2,#dfe9ef);
  color:var(--navy)
}
.portrait-fallback .monogram{
  width:96px;height:96px;border-radius:50%;display:grid;place-items:center;
  background:var(--surface);border:1px solid var(--accent-line);
  font-size:2rem;font-weight:700;color:var(--accent-dark);letter-spacing:.02em
}
.portrait-fallback span{font-size:.82rem;color:var(--muted)}
.visually-hidden{
  position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;
  clip:rect(0 0 0 0);white-space:nowrap;border:0
}

.hero-name{margin-bottom:.15em}
.hero-role{
  font-size:1.12rem;font-weight:600;color:var(--accent-dark);margin:0 0 .35em
}
.hero-subtitle{
  font-size:1.02rem;color:var(--ink-soft);margin:0 0 1.15em;max-width:34ch
}
.hero-rule{width:64px;height:3px;border-radius:3px;background:var(--accent);margin:0 0 1.2em}
.hero-facts{
  display:flex;flex-wrap:wrap;gap:26px;margin:1.6rem 0 0;padding:18px 0 0;
  border-top:1px solid var(--line);list-style:none
}
.hero-facts li{margin:0}
.hero-facts b{display:block;font-size:1.25rem;color:var(--navy);font-weight:700}
.hero-facts span{font-size:.82rem;color:var(--muted)}

/* ---------- cards ---------- */
.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px;box-shadow:var(--shadow-sm);
  display:flex;flex-direction:column;
  transition:transform .16s ease,box-shadow .2s ease,border-color .2s ease
}
.card h3{margin-bottom:.45em}
.card p{color:var(--ink-soft);font-size:.96rem}
.card p:last-child{margin-bottom:0}
.card--link:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--accent-line)}
.card--link:hover h3{color:var(--accent-dark)}
.card-icon{
  width:42px;height:42px;border-radius:12px;margin-bottom:16px;flex:0 0 auto;
  background:var(--accent-soft);border:1px solid var(--accent-line);
  display:grid;place-items:center;color:var(--accent-dark);font-weight:700;font-size:.95rem
}
.card-meta{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  font-size:.8rem;color:var(--muted);margin-bottom:14px
}
.card-meta .dot{width:3px;height:3px;border-radius:50%;background:var(--line-strong)}
.card-foot{margin-top:auto;padding-top:18px}

/* ---------- article / prose ---------- */
.article{max-width:768px;margin:0 auto}
.article-header{padding:56px 0 8px}
.article-header h1{font-size:clamp(1.7rem,1.2rem + 1.6vw,2.3rem);margin-bottom:.5em}
.article-meta{
  display:flex;flex-wrap:wrap;align-items:center;gap:12px;
  font-size:.85rem;color:var(--muted);margin-bottom:1.6rem
}
.article-lead{font-size:1.12rem;color:var(--ink-soft);line-height:1.7}
.prose{font-size:1.03rem;line-height:1.78;color:#1d3446}
.prose h2{margin-top:2.2rem;font-size:1.42rem}
.prose h3{margin-top:1.6rem;font-size:1.1rem}
.prose ul,.prose ol{padding-left:1.25em}
.prose li{margin:.45em 0}
.prose blockquote{
  margin:1.6rem 0;padding:18px 20px;border-left:3px solid var(--accent);
  background:var(--surface-alt);border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  color:var(--ink-soft)
}
.prose blockquote p:last-child{margin-bottom:0}
.prose table{width:100%;border-collapse:collapse;margin:1.5rem 0;font-size:.94rem}
.prose th,.prose td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line)}
.prose th{background:var(--surface-alt);color:var(--navy);font-weight:650}
.prose .sources{font-size:.9rem;color:var(--ink-soft)}
.prose .sources li{margin:.4em 0}

.article-footer{margin-top:2.5rem;padding-top:22px;border-top:1px solid var(--line)}

/* ---------- definition lists (locations) ---------- */
.field-list{margin:0;display:grid;gap:0}
.field{
  display:grid;grid-template-columns:210px minmax(0,1fr);gap:18px;
  padding:15px 0;border-top:1px solid var(--line)
}
.field:first-child{border-top:0}
.field dt{
  font-size:.84rem;font-weight:700;letter-spacing:.05em;text-transform:uppercase;
  color:var(--muted);margin:0
}
.field dd{margin:0;color:var(--ink)}
.field dd .sub{display:block;color:var(--ink-soft);font-size:.94rem;margin-top:.25em}

.location-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow-sm);overflow:hidden
}
.location-card + .location-card{margin-top:26px}
.location-head{
  padding:24px 28px;border-bottom:1px solid var(--line);background:var(--surface-alt);
  display:flex;flex-wrap:wrap;gap:10px 16px;align-items:center;justify-content:space-between
}
.location-head h2{margin:0;font-size:1.2rem}
.location-type{
  font-size:.76rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
  color:var(--accent-dark);background:var(--surface);border:1px solid var(--accent-line);
  padding:.3rem .65rem;border-radius:999px
}
.location-body{padding:10px 28px 24px}

/* ---------- timeline ---------- */
.timeline{list-style:none;margin:0;padding:0;border-left:2px solid var(--line)}
.timeline li{position:relative;padding:0 0 26px 26px;margin:0}
.timeline li::before{
  content:"";position:absolute;left:-7px;top:9px;width:12px;height:12px;border-radius:50%;
  background:var(--surface);border:2px solid var(--accent)
}
.timeline li:last-child{padding-bottom:0}
.timeline .when{
  display:block;font-size:.8rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;
  color:var(--accent-dark);margin-bottom:.15em
}
.timeline .what{display:block;font-weight:650;color:var(--navy)}
.timeline .where{display:block;color:var(--ink-soft);font-size:.95rem}

/* ---------- routing cards (locations: where to go) ---------- */
.route-card{
  display:flex;gap:18px;align-items:flex-start;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;box-shadow:var(--shadow-sm)
}
.route-num{
  width:36px;height:36px;flex:0 0 auto;border-radius:10px;display:grid;place-items:center;
  background:var(--accent-soft);border:1px solid var(--accent-line);
  color:var(--accent-dark);font-weight:700;font-size:.85rem
}
.route-card h3{margin:0 0 .3em;font-size:1.05rem}
.route-card p{margin:0;font-size:.94rem;color:var(--ink-soft)}
.route-card p + p{margin-top:.6em}

/* ---------- WeChat / QR ---------- */
.wechat-qr{
  width:100%;max-width:210px;height:auto;
  background:#fff;border:1px solid var(--line);border-radius:14px;padding:8px
}
.wechat-actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-top:14px}

/* ---------- WeChat hero: the primary contact route ---------- */
.wechat-hero{
  display:grid;grid-template-columns:264px minmax(0,1fr);gap:34px;align-items:center;
  background:linear-gradient(180deg,#ffffff 0%, var(--accent-soft) 100%);
  border:1px solid var(--accent-line);border-radius:var(--radius);
  padding:30px;box-shadow:var(--shadow-md)
}
.wechat-hero h2{margin-bottom:.55em}
.wechat-hero .wechat-qr{max-width:264px;padding:10px;box-shadow:var(--shadow-sm)}
.wechat-hero .wechat-actions{margin-top:14px}
.qr-caption{margin:14px 0 0;font-size:.85rem;line-height:1.55;color:var(--muted)}
.qr-caption strong{color:var(--navy)}

.contact-points{list-style:none;margin:0 0 20px;padding:0}
.contact-points li{
  position:relative;padding-left:26px;margin:.6em 0;
  font-size:.97rem;color:var(--ink-soft)
}
.contact-points li::before{
  content:"";position:absolute;left:5px;top:.62em;
  width:8px;height:8px;border-radius:50%;background:var(--accent)
}
.contact-points strong{color:var(--navy)}

/* ---------- De-emphasised secondary information ---------- */
.de-emphasized,.de-emphasized a{color:var(--muted);font-size:.93rem}
.de-emphasized a{text-decoration:underline;text-decoration-color:var(--line-strong)}
.de-emphasized .sub{font-size:.88rem;margin-top:.3em}

/* ---------- Optional imagery ----------
   These blocks ship hidden and are revealed by main.js only when the image file
   actually exists, so an unfilled slot never shows as a broken image. */
[data-optional-media]{display:none}
[data-optional-media].is-loaded{display:block}

.media img{
  width:100%;height:auto;display:block;border-radius:var(--radius);
  border:1px solid var(--line);box-shadow:var(--shadow-sm)
}
.media--article{margin:0 0 34px}
.media--article img{border-radius:14px}
.media figcaption{margin-top:10px;font-size:.84rem;line-height:1.55;color:var(--muted)}

.card-thumb{margin:0 0 18px}
.card-thumb img{
  width:100%;height:172px;object-fit:cover;display:block;
  object-position:50% 24%;
  border-radius:12px;border:1px solid var(--line)
}

.location-photo{margin:20px 0 22px}
.location-photo img{aspect-ratio:16/9;object-fit:cover;border-radius:12px}

.media-note{margin:10px 0 0;font-size:.82rem;color:var(--muted)}

/* Tall image (for example a full-spine radiograph) beside its explanation */
.media--split{
  grid-template-columns:minmax(0,222px) minmax(0,1fr);
  gap:28px;align-items:start
}
.media--split.is-loaded{display:grid}
.media--split img{border-radius:12px;border:1px solid var(--line)}
.media--split .media-note{margin:0;font-size:.95rem;line-height:1.72;color:var(--ink-soft)}
.media--split .media-note strong{color:var(--navy)}

/* ---------- publication list ---------- */
.pub-list{list-style:none;margin:0;padding:0}
.pub-list li{
  padding:18px 0;border-top:1px solid var(--line);margin:0;
  display:grid;grid-template-columns:86px minmax(0,1fr);gap:18px
}
.pub-list li:first-child{border-top:0}
.pub-list .year{font-weight:700;color:var(--accent-dark);font-size:.95rem}
.pub-list .cite{color:var(--ink)}
.pub-list .cite em{color:var(--ink-soft)}
.role-badge{
  display:inline-block;margin-top:.4em;font-size:.76rem;font-weight:700;letter-spacing:.06em;
  text-transform:uppercase;color:var(--muted)
}

/* ---------- contact ---------- */
.contact-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:30px;box-shadow:var(--shadow-sm)
}
.contact-line{
  display:flex;flex-wrap:wrap;align-items:center;gap:12px 18px;
  padding:20px 0;border-top:1px solid var(--line)
}
.contact-line:first-of-type{border-top:0}
.contact-label{
  flex:0 0 220px;font-size:.82rem;font-weight:700;letter-spacing:.06em;
  text-transform:uppercase;color:var(--muted)
}
.contact-value{font-size:1.05rem;font-weight:600;color:var(--navy);word-break:break-word}
.copy-btn{
  background:var(--surface);border:1px solid var(--line-strong);border-radius:9px;
  padding:.42rem .7rem;font:inherit;font-size:.82rem;font-weight:600;color:var(--ink-soft);
  cursor:pointer
}
.copy-btn:hover{border-color:var(--accent);color:var(--accent-dark)}
.copy-btn[data-copied="true"]{background:var(--accent-soft);border-color:var(--accent-line);color:var(--accent-dark)}

/* ---------- footer ---------- */
.site-footer{
  background:var(--navy);color:#c9d8e3;margin-top:8px;padding:52px 0 26px;font-size:.92rem
}
.site-footer a{color:#e7f0f5;text-decoration:none}
.site-footer a:hover{text-decoration:underline}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:34px}
.footer-grid h3{color:#fff;font-size:.82rem;letter-spacing:.12em;text-transform:uppercase;margin-bottom:1em}
.footer-grid ul{list-style:none;margin:0;padding:0}
.footer-grid li{margin:.4em 0}
.footer-note{
  margin-top:34px;padding-top:20px;border-top:1px solid rgba(255,255,255,.16);
  color:#9db2c1;font-size:.84rem;display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:space-between
}

/* ---------- responsive ---------- */
@media (max-width:1000px){
  .hero-grid{grid-template-columns:260px minmax(0,1fr);gap:36px}
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr 1fr}
}

@media (max-width:860px){
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;top:var(--header-h);left:0;right:0;
    background:var(--surface);border-bottom:1px solid var(--line);
    box-shadow:var(--shadow-md);padding:10px 18px 18px;
    display:none
  }
  .site-nav.is-open{display:block}
  .site-nav ul{flex-direction:column;align-items:stretch;gap:2px}
  .site-nav a{padding:.7rem .8rem;font-size:1rem}
  .hero-grid{grid-template-columns:1fr;gap:28px}
  .portrait-card{max-width:280px}
  .grid--2,.grid--3,.grid--4{grid-template-columns:1fr}
  .field{grid-template-columns:1fr;gap:4px}
  .contact-label{flex-basis:100%}
  .section{padding:56px 0}
  .footer-grid{grid-template-columns:1fr}
  .pub-list li{grid-template-columns:1fr;gap:6px}
  .route-card{padding:18px}
  .wechat-hero{grid-template-columns:1fr;gap:24px;padding:22px}
  .wechat-hero .wechat-qr{max-width:200px}
  .media--split.is-loaded{display:block}
  .media--split img{max-width:240px;margin:0 auto 16px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none !important;animation:none !important}
}

@media print{
  .site-header,.site-footer,.btn,.copy-btn{display:none !important}
  main{padding-top:0}
  body{background:#fff;font-size:12pt}
  .section{padding:18px 0}
  .card,.location-card,.contact-card{box-shadow:none}
}