/* ===== reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,picture,svg{max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4,h5,h6{font-weight:800;line-height:1.25}

/* ===== tokens ===== */
:root{
  --cream:#F3EDE0;
  --paper:#FFFBF2;
  --deep:#0E4B47;
  --teal:#1E7C72;
  --shallow:#CDE1DA;
  --sand:#D5A02F;
  --sand-soft:#F6E6C0;
  --brick:#B4432C;
  --ink:#1B1916;
  --mist:#6C6A61;
  --serif:"Source Han Serif SC","Noto Serif SC","Songti SC",Georgia,"Times New Roman",serif;
  --sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans SC",system-ui,-apple-system,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --wrap:1180px;
  --radius-card:14px;
  --radius-pill:999px;
  --shadow-hard:6px 6px 0 var(--ink);
  --shadow-soft:4px 4px 0 var(--teal);
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ===== base type ===== */
body{
  background:var(--cream);
  color:var(--ink);
  font-family:var(--sans);
  font-size:16.5px;
  line-height:1.85;
}
h1{font-family:var(--serif);font-size:clamp(34px,5vw,60px);letter-spacing:-.01em}
h2{font-family:var(--serif);font-size:clamp(24px,3.2vw,36px);letter-spacing:-.01em}
h3{font-family:var(--serif);font-size:clamp(19px,2.2vw,25px)}
strong{font-weight:700}
::selection{background:var(--sand-soft);color:var(--ink)}

a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,[tabindex]:focus-visible{
  outline:3px solid var(--sand);
  outline-offset:2px;
}

/* ===== skip link ===== */
.skip-link{
  position:absolute;
  left:14px;
  top:-72px;
  z-index:120;
  background:var(--ink);
  color:var(--paper);
  padding:10px 18px;
  border-radius:0 0 12px 12px;
  font-size:14px;
  font-weight:600;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:0}

/* ===== header ===== */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:var(--cream);
  border-bottom:2px solid var(--ink);
  padding:10px 16px 12px;
  transition:padding .2s var(--ease),box-shadow .2s var(--ease);
}
.site-header[data-scrolled]{
  padding-top:6px;
  padding-bottom:9px;
  box-shadow:0 6px 0 rgba(27,25,22,.12);
}
.header-inner{
  position:relative;
  max-width:var(--wrap);
  margin:0 auto;
  display:flex;
  align-items:center;
  gap:14px;
  background:var(--paper);
  border:2px solid var(--ink);
  border-radius:var(--radius-pill);
  padding:8px 12px 8px 14px;
  box-shadow:4px 4px 0 var(--ink);
  transition:box-shadow .2s var(--ease),border-radius .2s var(--ease);
}
.site-header[data-scrolled] .header-inner{box-shadow:2px 2px 0 var(--ink)}

.brand{display:flex;align-items:center;gap:10px;min-width:0;flex:0 1 auto}
.brand-mark{
  display:grid;
  place-items:center;
  width:38px;
  height:38px;
  flex:0 0 38px;
  background:var(--deep);
  color:var(--sand-soft);
  border:2px solid var(--ink);
  border-radius:10px;
  font-family:var(--serif);
  font-weight:900;
  font-size:19px;
  line-height:1;
  transform:rotate(-3deg);
  box-shadow:2px 2px 0 var(--sand);
  transition:transform .22s var(--ease),box-shadow .22s var(--ease);
}
.brand:hover .brand-mark{transform:rotate(2deg);box-shadow:4px 4px 0 var(--sand)}
.brand-text{display:flex;flex-direction:column;min-width:0}
.brand-name{
  font-family:var(--serif);
  font-weight:800;
  font-size:16.5px;
  color:var(--ink);
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
.brand-tagline{
  font-size:11.5px;
  line-height:1.5;
  color:var(--mist);
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

.site-nav{margin-left:auto;display:flex;align-items:center;min-width:0}
.nav-list{display:flex;align-items:center;gap:2px;flex-wrap:nowrap}
.nav-link{
  display:block;
  padding:8px 12px;
  border-radius:var(--radius-pill);
  font-size:14.5px;
  font-weight:500;
  color:var(--deep);
  white-space:nowrap;
  transition:background .18s var(--ease),color .18s var(--ease),box-shadow .18s var(--ease);
}
.nav-link:hover{background:var(--shallow)}
.nav-link[aria-current="page"]{
  background:var(--deep);
  color:var(--paper);
  box-shadow:inset 0 -3px 0 var(--sand);
}

.header-actions{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.search-field{
  display:flex;
  align-items:center;
  gap:6px;
  background:var(--cream);
  border:2px solid var(--deep);
  border-radius:var(--radius-pill);
  padding:5px 12px;
  transition:border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.search-field:focus-within{border-color:var(--sand);box-shadow:0 0 0 3px var(--sand-soft)}
.search-label{font-family:var(--mono);font-size:11.5px;letter-spacing:.06em;color:var(--mist)}
.search-input{
  border:0;
  background:transparent;
  width:150px;
  font-size:13.5px;
  outline:none;
}
.search-input::placeholder{color:var(--mist)}

.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  background:var(--deep);
  color:var(--paper);
  border:2px solid var(--ink);
  border-radius:var(--radius-pill);
  padding:7px 14px;
  cursor:pointer;
  box-shadow:3px 3px 0 var(--sand);
  transition:transform .18s var(--ease),box-shadow .18s var(--ease);
}
.nav-toggle:hover{transform:translate(-1px,-1px);box-shadow:4px 4px 0 var(--sand)}
.nav-toggle-bars{display:flex;flex-direction:column;gap:3px}
.nav-toggle-bar{display:block;width:16px;height:2px;background:var(--paper);transition:transform .2s var(--ease),opacity .2s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3){transform:translateY(-5px) rotate(-45deg)}
.nav-toggle-label{font-size:13px;font-weight:600}

.quick-strip{
  max-width:var(--wrap);
  margin:10px auto 0;
  display:flex;
  align-items:center;
  gap:8px;
  overflow-x:auto;
  padding-bottom:2px;
  scrollbar-width:thin;
}
.quick-strip-label{
  flex:0 0 auto;
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--mist);
  border-right:2px solid var(--shallow);
  padding-right:10px;
}
.quick-link{
  flex:0 0 auto;
  font-size:12.5px;
  font-weight:600;
  padding:5px 12px;
  border:2px solid var(--deep);
  border-radius:var(--radius-pill);
  background:var(--sand-soft);
  color:var(--ink);
  transition:background .18s var(--ease),color .18s var(--ease),transform .18s var(--ease);
}
.quick-link:hover{background:var(--deep);color:var(--paper);transform:translateY(-1px)}

.read-progress{position:absolute;left:0;right:0;bottom:0;height:4px;background:var(--shallow);overflow:hidden}
.read-progress-bar{
  display:block;
  height:100%;
  width:100%;
  background:var(--brick);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform .1s linear;
}

/* ===== footer ===== */
.site-footer{
  margin-top:72px;
  background:var(--deep);
  color:var(--cream);
  border-top:6px solid var(--ink);
  padding-top:46px;
}
.footer-inner{
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 20px;
  display:grid;
  grid-template-columns:1.05fr 1.6fr;
  gap:40px;
}
.footer-lead{display:flex;flex-direction:column;align-items:flex-start;gap:12px}
.footer-brand{font-family:var(--serif);font-size:22px;font-weight:800;color:var(--paper);letter-spacing:-.01em;line-height:1.4}
.footer-blurb{font-size:14.5px;line-height:1.8;color:rgba(243,237,224,.84);max-width:36ch}
.footer-stamp{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.stamp-mono{
  display:inline-block;
  font-family:var(--mono);
  font-size:12.5px;
  color:var(--ink);
  background:var(--sand);
  border:2px solid var(--ink);
  border-radius:6px;
  padding:4px 10px;
  transform:rotate(-1.5deg);
}
.stamp-note{font-family:var(--mono);font-size:12px;color:var(--shallow)}
.footer-cta{margin-top:6px}
.footer-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.footer-col-title{
  font-family:var(--mono);
  font-size:12px;
  font-weight:600;
  letter-spacing:.1em;
  color:var(--sand);
  margin-bottom:12px;
  padding-bottom:6px;
  border-bottom:2px solid rgba(213,160,47,.45);
}
.footer-list{display:flex;flex-direction:column;gap:9px}
.footer-link{
  display:inline-block;
  font-size:14.5px;
  color:rgba(243,237,224,.88);
  border-bottom:1px dashed rgba(243,237,224,.25);
  padding-bottom:2px;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer-link:hover{color:var(--sand);border-color:var(--sand)}
.footer-base{
  max-width:var(--wrap);
  margin:36px auto 0;
  padding:18px 20px 26px;
  border-top:2px solid rgba(243,237,224,.2);
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:8px 20px;
  font-size:13px;
  color:rgba(243,237,224,.8);
}
.footer-contact{flex:1 1 100%;font-size:13.5px;line-height:1.7}
.footer-hours{font-family:var(--mono);font-size:12px;color:var(--shallow)}
.footer-copy,.footer-icp{font-family:var(--mono);font-size:12px;color:rgba(243,237,224,.7)}

.back-to-top{
  position:fixed;
  right:18px;
  bottom:18px;
  z-index:70;
  padding:10px 16px;
  border:2px solid var(--ink);
  border-radius:var(--radius-pill);
  background:var(--brick);
  color:var(--paper);
  font-size:13.5px;
  font-weight:600;
  cursor:pointer;
  box-shadow:4px 4px 0 var(--ink);
  opacity:0;
  visibility:hidden;
  transform:translateY(8px);
  transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s var(--ease);
}
.back-to-top[data-visible]{opacity:1;visibility:visible;transform:none}

/* ===== layout helpers ===== */
.page-shell{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 20px}
.grid{display:grid;gap:18px}
.grid-2{display:grid;gap:18px;grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{display:grid;gap:18px;grid-template-columns:repeat(3,minmax(0,1fr))}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:12px;
  margin:0 0 18px;
  padding-bottom:10px;
  border-bottom:2px solid var(--deep);
}
.section-label{
  display:inline-flex;
  align-items:center;
  font-family:var(--mono);
  font-size:12.5px;
  letter-spacing:.08em;
  color:var(--deep);
  background:var(--sand-soft);
  border:2px solid var(--ink);
  border-radius:4px;
  padding:2px 8px;
}
.section-label::before{content:"[";margin-right:4px;color:var(--brick)}
.section-label::after{content:"]";margin-left:4px;color:var(--brick)}
.section-title{font-family:var(--serif);color:var(--ink)}

.panel{
  background:var(--paper);
  border:2px solid var(--ink);
  border-radius:var(--radius-card);
  box-shadow:var(--shadow-hard);
  padding:20px;
}

.tag-row{display:flex;flex-wrap:wrap;gap:8px}
.tag{
  font-size:12.5px;
  letter-spacing:.04em;
  padding:4px 11px;
  border:2px solid var(--deep);
  border-radius:var(--radius-pill);
  background:var(--shallow);
  color:var(--deep);
}
.tag--accent{background:var(--sand-soft);border-color:var(--sand);color:var(--ink)}
.tag--hot{background:var(--brick);border-color:var(--ink);color:var(--paper)}

.meta-mono{
  font-family:var(--mono);
  font-size:12.5px;
  color:var(--mist);
  border-bottom:2px solid var(--sand);
  padding-bottom:1px;
}

/* ===== buttons ===== */
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:10px 18px;
  border:2px solid var(--ink);
  border-radius:var(--radius-pill);
  background:var(--paper);
  color:var(--ink);
  font-size:14.5px;
  font-weight:600;
  box-shadow:4px 4px 0 var(--ink);
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),background .18s var(--ease);
}
.btn:hover{transform:translate(-1px,-1px);box-shadow:6px 6px 0 var(--ink)}
.btn:active{transform:translate(2px,2px);box-shadow:2px 2px 0 var(--ink)}
.btn-primary{background:var(--brick);color:var(--paper)}
.btn-ghost{background:transparent;border-color:var(--deep);color:var(--deep);box-shadow:4px 4px 0 var(--teal)}
.btn-small{padding:6px 12px;font-size:13px;box-shadow:3px 3px 0 var(--ink)}

/* ===== breadcrumb ===== */
.breadcrumb{margin:22px 0 6px}
.breadcrumb-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--mono);
  font-size:13px;
  color:var(--mist);
}
.breadcrumb-link{color:var(--teal);border-bottom:1px dashed var(--sand)}
.breadcrumb-link:hover{color:var(--brick);border-color:var(--brick)}
.breadcrumb-current{color:var(--ink)}

/* ===== prose ===== */
.prose{max-width:68ch;font-size:16.5px;line-height:1.85;color:var(--ink)}
.prose p+p{margin-top:1.2em}
.prose h2{
  font-family:var(--serif);
  font-size:clamp(22px,2.6vw,28px);
  margin:2em 0 .6em;
  padding-left:12px;
  border-left:6px solid var(--sand);
  scroll-margin-top:120px;
}
.prose h3{font-family:var(--serif);font-size:clamp(18px,2vw,22px);margin:1.6em 0 .5em;scroll-margin-top:120px}
.prose a{color:var(--teal);border-bottom:2px solid var(--sand)}
.prose a:hover{color:var(--brick);border-color:var(--brick)}
.prose ul,.prose ol{padding-left:1.4em;margin:1em 0}
.prose li{list-style:disc;line-height:1.8}
.prose ol li{list-style:decimal}
.prose li+li{margin-top:.4em}
.prose blockquote{
  margin:1.4em 0;
  padding:12px 16px;
  background:var(--paper);
  border-left:6px solid var(--shallow);
  color:var(--mist);
}

/* ===== toc ===== */
.toc{
  background:var(--paper);
  border:2px solid var(--ink);
  border-radius:var(--radius-card);
  box-shadow:var(--shadow-hard);
  padding:16px;
}
.toc-title{
  font-family:var(--mono);
  font-size:12.5px;
  letter-spacing:.08em;
  color:var(--mist);
  margin-bottom:10px;
}
.toc-list{display:flex;flex-direction:column;gap:2px;border-left:2px solid var(--shallow)}
.toc-link{
  display:block;
  margin-left:-2px;
  padding:7px 10px;
  border-left:2px solid transparent;
  font-size:14px;
  color:var(--deep);
  transition:background .18s var(--ease),border-color .18s var(--ease);
}
.toc-link:hover{background:var(--shallow)}
.toc-link[aria-current="true"]{
  border-left-color:var(--brick);
  background:var(--sand-soft);
  font-weight:600;
}

/* ===== media frames ===== */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  background:var(--paper);
  border:2px solid var(--ink);
  border-radius:var(--radius-card);
  box-shadow:var(--shadow-hard);
}
.media img,.media picture>img{display:block;width:100%;height:100%;object-fit:cover}
.media--wide{aspect-ratio:16/9}
.media--tall{aspect-ratio:3/4}
.media--ratio{aspect-ratio:4/3}
.media--tinted{background:linear-gradient(140deg,var(--shallow) 0%,var(--sand-soft) 62%,var(--cream) 100%)}
.media-caption{
  font-family:var(--mono);
  font-size:12px;
  line-height:1.6;
  color:var(--mist);
  background:var(--paper);
  border-top:1px dashed var(--mist);
  padding:8px 12px;
}

/* ===== reveal ===== */
html.has-js [data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .22s var(--ease),transform .22s var(--ease);
}
html.has-js [data-reveal].is-in{opacity:1;transform:none}

/* ===== responsive ===== */
@media (max-width:1080px){
  .brand-tagline{display:none}
  .search-input{width:110px}
  .nav-link{padding:8px 10px;font-size:14px}
}
@media (max-width:900px){
  .search-field{display:none}
  .nav-toggle{display:inline-flex}
  .header-inner{border-radius:18px}
  .site-nav{
    position:absolute;
    left:0;
    right:0;
    top:calc(100% + 10px);
    margin:0;
    display:none;
    background:var(--paper);
    border:2px solid var(--ink);
    border-radius:16px;
    box-shadow:var(--shadow-hard);
    padding:10px;
    z-index:80;
  }
  .site-nav[data-open]{display:block}
  .nav-list{flex-direction:column;align-items:stretch;gap:2px}
  .nav-link{padding:12px 14px;border-radius:10px;font-size:15.5px}
  .nav-link[aria-current="page"]{box-shadow:inset 4px 0 0 var(--sand)}
  .header-actions{margin-left:auto}
  .grid-2,.grid-3{grid-template-columns:1fr}
  .footer-inner{grid-template-columns:1fr;gap:28px}
  .footer-nav{grid-template-columns:1fr 1fr}
}
@media (max-width:560px){
  body{font-size:16px}
  .site-header{padding-left:10px;padding-right:10px}
  .brand-name{font-size:15px}
  .footer-nav{grid-template-columns:1fr}
  .panel{padding:16px}
  .footer-base{padding-bottom:76px}
  .back-to-top{right:12px;bottom:12px}
}

/* ===== motion preference ===== */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html.has-js [data-reveal]{opacity:1;transform:none}
  .brand-mark,.stamp-mono{transform:none}
}