:root{
  --deep:#1F4B57;
  --teal:#2E7C8C;
  --light-teal:#7FC4CF;
  --mist:#E8F1F2;
  --cream:#F5F1E8;
  --orange:#E2703A;
  --stone:#B8A99A;
  --moss:#6B7A5E;
  --ink:#3D2E28;
  --white:#FFFFFF;
  --font-sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"IBM Plex Mono","SFMono-Regular",Consolas,"Liberation Mono",monospace;
  --shadow-hard:6px 6px 0 var(--stone);
  --shadow-soft:4px 4px 0 rgba(31,75,87,.22);
  --radius-pill:999px;
  --radius-card:6px;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font-sans);
  font-size:16px;
  font-weight:400;
  line-height:1.8;
  color:var(--ink);
  background:var(--mist);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{
  margin:0 0 .5em;
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.15;
  color:var(--deep);
}
p{margin:0 0 1.6em}
ul{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
a:hover{color:var(--teal)}
img{max-width:100%;display:block}
button{font:inherit;color:inherit;background:none;border:none;cursor:pointer}
:focus-visible{outline:3px solid var(--orange);outline-offset:3px;border-radius:2px}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.01em}
.is-hidden{display:none !important}

/* ---------- skip link ---------- */
.skip-link{
  position:absolute;left:16px;top:-60px;z-index:200;
  padding:10px 18px;background:var(--deep);color:var(--white);
  border:2px solid var(--deep);border-radius:var(--radius-pill);
  font-weight:700;transition:top .16s var(--ease);
}
.skip-link:focus{top:16px;color:var(--white)}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(232,241,242,.9);
  border-bottom:2px solid rgba(31,75,87,.18);
  backdrop-filter:blur(8px);
}
.topbar{
  max-width:1180px;margin:0 auto;
  display:flex;align-items:center;gap:18px;
  padding:14px 24px;
}
.brand-island{
  display:flex;align-items:center;
  background:var(--white);
  border:2px solid var(--deep);
  border-radius:var(--radius-pill);
  padding:6px 16px 6px 8px;
  box-shadow:var(--shadow-soft);
  flex:0 0 auto;
}
.brand{display:flex;align-items:center;gap:10px;color:var(--deep)}
.brand:hover{color:var(--teal)}
.brand-mark{
  display:inline-flex;align-items:center;justify-content:center;
  width:34px;height:34px;
  background:var(--deep);color:var(--white);
  border-radius:var(--radius-pill);
  font-family:var(--font-mono);font-size:13px;font-weight:700;letter-spacing:-.02em;
}
.brand-text{font-size:15px;font-weight:800;letter-spacing:-.01em;white-space:nowrap}
.brand-sep{margin:0 4px;color:var(--orange)}
.nav-island{
  position:relative;margin-left:auto;
  background:var(--white);
  border:2px solid var(--teal);
  border-radius:var(--radius-pill);
  padding:6px;
  box-shadow:var(--shadow-hard);
}
.nav-list{display:flex;align-items:center;gap:4px}
.nav-list a{
  display:block;
  padding:9px 16px;
  border-radius:var(--radius-pill);
  font-size:15px;font-weight:700;
  color:var(--deep);
  border:2px solid transparent;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.nav-list a:hover{background:var(--mist);color:var(--deep);border-color:var(--light-teal)}
.nav-list a[aria-current="page"]{
  background:var(--deep);color:var(--white);border-color:var(--deep);
}
.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:9px 16px;
  border:2px solid var(--teal);border-radius:var(--radius-pill);
  background:var(--mist);color:var(--deep);
  font-size:15px;font-weight:700;
}
.nav-toggle-bars{display:inline-flex;flex-direction:column;justify-content:center;gap:4px;width:18px}
.nav-toggle-bars span{display:block;height:2px;background:var(--deep);border-radius:2px;transition:transform .18s var(--ease),opacity .18s var(--ease)}
.nav-island[data-open="true"] .nav-toggle{background:var(--deep);color:var(--white);border-color:var(--deep)}
.nav-island[data-open="true"] .nav-toggle-bars span{background:var(--white)}
.nav-island[data-open="true"] .nav-toggle-bars span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-island[data-open="true"] .nav-toggle-bars span:nth-child(2){opacity:0}
.nav-island[data-open="true"] .nav-toggle-bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.stamp-capsule{
  margin:0;flex:0 0 auto;
  padding:8px 14px;
  background:var(--cream);
  border:2px solid var(--orange);
  border-radius:var(--radius-pill);
  box-shadow:var(--shadow-soft);
  font-family:var(--font-mono);font-size:13px;font-weight:700;
  color:var(--deep);
}
.stamp-capsule a{color:var(--deep)}
.stamp-capsule a:hover{color:var(--orange)}
.scroll-progress{
  position:absolute;left:0;right:0;bottom:-3px;height:3px;
  background:rgba(31,75,87,.12);
}
.scroll-progress span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--teal),var(--orange))}

/* ---------- layout ---------- */
.container{width:100%;max-width:1180px;margin:0 auto;padding:0 24px}
.section{padding:56px 0}
.section-head{margin-bottom:24px}
.eyebrow{
  display:inline-block;margin-bottom:10px;
  font-family:var(--font-mono);font-size:12px;font-weight:700;
  letter-spacing:.12em;text-transform:uppercase;
  color:var(--teal);
}
.section-title{font-size:clamp(24px,3.2vw,36px);margin-bottom:8px}
.index-num{
  display:block;
  font-family:var(--font-mono);font-size:clamp(48px,8vw,96px);
  font-weight:700;line-height:1;letter-spacing:-.04em;
  color:var(--light-teal);
}
.lede{font-size:clamp(17px,2.1vw,20px);font-weight:500;color:var(--deep);max-width:60ch}
.grid{display:grid;gap:24px}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}

/* ---------- components ---------- */
.card{
  position:relative;
  background:var(--white);
  border:2px solid var(--ink);
  border-radius:var(--radius-card);
  padding:22px 22px 24px;
  box-shadow:var(--shadow-hard);
  transition:transform .18s var(--ease),box-shadow .18s var(--ease);
}
.card:hover{transform:translateY(-2px);box-shadow:8px 8px 0 var(--stone)}
.card-title{font-size:19px;margin-bottom:8px}
.card-meta{
  margin:0;
  font-family:var(--font-mono);font-size:13px;font-weight:700;
  color:var(--orange);
}
.tag{
  display:inline-block;
  padding:3px 12px;margin:0 6px 6px 0;
  border:2px solid var(--teal);border-radius:var(--radius-pill);
  background:var(--mist);color:var(--deep);
  font-size:13px;font-weight:700;
}
.tag--moss{background:#EDF0E7;border-color:var(--moss);color:var(--moss)}
.tag--orange{background:#FBE8DE;border-color:var(--orange);color:#9C4118}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 20px;
  border:2px solid var(--deep);border-radius:var(--radius-pill);
  background:var(--white);color:var(--deep);
  font-size:15px;font-weight:700;
  box-shadow:var(--shadow-soft);
  transition:transform .16s var(--ease),box-shadow .16s var(--ease),background-color .16s var(--ease),color .16s var(--ease);
}
.btn:hover{transform:translateY(-2px);color:var(--deep)}
.btn--primary{background:var(--orange);border-color:var(--orange);color:#2A1A12}
.btn--primary:hover{color:#2A1A12}
.btn--ghost{background:transparent;border-color:var(--teal);color:var(--deep);box-shadow:none}
.breadcrumbs{
  padding:18px 0 0;
  font-family:var(--font-mono);font-size:13px;font-weight:700;
  color:var(--teal);
}
.breadcrumbs a{color:var(--deep);border-bottom:2px solid var(--light-teal)}
.breadcrumbs span[aria-hidden="true"]{margin:0 8px;color:var(--stone)}
.filter-bar{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:24px}
.filter-btn{
  padding:8px 16px;
  border:2px solid var(--teal);border-radius:var(--radius-pill);
  background:var(--white);color:var(--deep);
  font-size:14px;font-weight:700;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.filter-btn:hover{background:var(--mist)}
.filter-btn[aria-pressed="true"]{background:var(--light-teal);border-color:var(--deep);color:var(--deep)}
.timeline{position:relative;padding-left:26px}
.timeline::before{content:"";position:absolute;left:6px;top:6px;bottom:6px;width:2px;background:var(--stone)}
.timeline-item{position:relative;padding:0 0 26px 12px}
.timeline-item::before{content:"";position:absolute;left:-25px;top:10px;width:12px;height:12px;background:var(--cream);border:2px solid var(--teal);border-radius:50%}
.timeline-date{
  display:block;
  font-family:var(--font-mono);font-size:13px;font-weight:700;
  color:var(--orange);
}
.steps{display:grid;gap:18px;counter-reset:step}
.step{display:flex;gap:16px;align-items:flex-start;background:var(--cream);border:2px solid var(--stone);border-radius:var(--radius-card);padding:18px 20px}
.step-num{
  flex:0 0 auto;
  font-family:var(--font-mono);font-size:22px;font-weight:700;line-height:1.2;
  color:var(--deep);
}
.accordion{border:2px solid var(--ink);border-radius:var(--radius-card);background:var(--white);overflow:hidden;box-shadow:var(--shadow-soft)}
.accordion-item + .accordion-item{border-top:2px solid var(--ink)}
.accordion-trigger{
  width:100%;display:flex;justify-content:space-between;align-items:center;gap:16px;
  padding:16px 20px;text-align:left;
  font-size:16px;font-weight:700;color:var(--deep);
  transition:background-color .16s var(--ease);
}
.accordion-trigger:hover{background:var(--mist)}
.accordion-trigger::after{
  content:"+";font-family:var(--font-mono);font-size:20px;font-weight:700;color:var(--orange);flex:0 0 auto;
}
.accordion-trigger[aria-expanded="true"]::after{content:"–"}
.accordion-panel{padding:0 20px 18px;color:var(--ink)}
.accordion-panel[hidden]{display:none}
.media-frame{
  position:relative;overflow:hidden;
  background:var(--cream);
  border:2px solid var(--ink);border-radius:var(--radius-card);
  box-shadow:var(--shadow-hard);
  aspect-ratio:16/10;
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame--tall{aspect-ratio:4/5}
.table-wrap{
  width:100%;overflow-x:auto;
  border:2px solid var(--ink);border-radius:var(--radius-card);
  background:var(--white);box-shadow:var(--shadow-soft);
}
.table-wrap table{width:100%;border-collapse:collapse;font-size:15px}
.table-wrap th,.table-wrap td{padding:12px 16px;text-align:left;border-bottom:2px solid var(--mist)}
.table-wrap th{background:var(--mist);color:var(--deep);font-weight:800}
.table-wrap tr:last-child td{border-bottom:none}
.empty-note{margin:0;padding:18px 20px;background:var(--cream);border:2px dashed var(--stone);border-radius:var(--radius-card);color:var(--deep);font-weight:700}
[data-reveal]{opacity:0;transform:translateY(4px);transition:opacity .22s ease-out,transform .22s ease-out}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- copy button ---------- */
.copy-btn{
  margin-left:8px;
  padding:3px 12px;
  border:2px solid var(--light-teal);border-radius:var(--radius-pill);
  background:transparent;color:var(--mist);
  font-size:12px;font-weight:700;
  transition:background-color .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease);
}
.copy-btn:hover{background:var(--orange);border-color:var(--orange);color:#2A1A12}
.copy-btn[data-copied="true"]{background:var(--moss);border-color:var(--moss);color:var(--white)}

/* ---------- footer ---------- */
.site-footer{
  margin-top:64px;
  background:var(--deep);
  color:var(--mist);
  border-top:6px solid var(--orange);
  padding:52px 0 20px;
}
.footer-inner{max-width:1180px;margin:0 auto;padding:0 24px}
.footer-brand{margin-bottom:32px}
.footer-brand-name{margin:0;font-size:26px;font-weight:800;letter-spacing:-.02em;color:var(--white)}
.footer-brand-line{margin:4px 0 0;font-family:var(--font-mono);font-size:13px;font-weight:700;color:var(--light-teal)}
.footer-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:28px 24px}
.footer-title{
  margin:0 0 12px;
  font-size:15px;font-weight:800;letter-spacing:.04em;
  color:var(--white);
}
.footer-list li{margin-bottom:8px;font-size:15px}
.footer-list a{color:var(--mist);border-bottom:2px solid transparent;transition:color .16s var(--ease),border-color .16s var(--ease)}
.footer-list a:hover{color:var(--orange);border-color:var(--orange)}
.footer-contact{
  display:flex;flex-wrap:wrap;gap:10px 28px;
  margin:32px 0 0;padding:20px 0 0;
  border-top:2px solid rgba(232,241,242,.28);
}
.footer-contact-item{margin:0;font-size:15px;color:var(--mist)}
.footer-contact-item .mono{color:var(--white);font-weight:700}
.footer-base{
  max-width:1180px;margin:26px auto 0;padding:16px 24px 0;
  border-top:2px solid rgba(232,241,242,.18);
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 24px;
  font-size:13px;color:rgba(232,241,242,.78);
}
.footer-base p{margin:0}

/* ---------- responsive ---------- */
@media (max-width:1024px){
  .grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:900px){
  .topbar{gap:12px;padding:12px 18px;flex-wrap:wrap}
  .brand-text{font-size:14px}
  .nav-island{margin-left:0;order:3;width:100%;border-radius:20px}
  .nav-toggle{display:inline-flex;width:100%;justify-content:center}
  .stamp-capsule{margin-left:auto;font-size:12px;padding:6px 12px}
  .nav-list{
    position:absolute;top:calc(100% + 12px);left:0;right:0;z-index:90;
    flex-direction:column;align-items:stretch;gap:6px;
    padding:12px;
    background:var(--white);
    border:2px solid var(--teal);border-radius:18px;
    box-shadow:var(--shadow-hard);
    opacity:0;visibility:hidden;transform:translateY(-6px);
    transition:opacity .18s var(--ease),transform .18s var(--ease),visibility .18s var(--ease);
  }
  .nav-list a{padding:12px 16px;border-radius:14px;font-size:16px}
  .nav-island[data-open="true"] .nav-list{opacity:1;visibility:visible;transform:none}
  .section{padding:40px 0}
  .grid-2,.grid-3{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:600px){
  .container{padding:0 18px}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-base{flex-direction:column}
  .timeline{padding-left:20px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  [data-reveal]{opacity:1;transform:none}
}