:root{
  --paper:#E8E3DB;
  --ink:#1A1816;
  --crimson:#9E2B25;
  --indigo:#2B3A67;
  --gold:#C99A2E;
  --jade:#2F8F7B;
  --cream:#F7F4EF;
  --slate:#4A4642;
  --line:#B7A99A;
  --font-head:"Source Han Serif SC","Noto Serif SC","Songti SC","STSong",serif;
  --font-body:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular","Cascadia Mono",Consolas,"Courier New",monospace;
  --shell:min(1240px,100% - 2.5rem);
  --ease:cubic-bezier(0.2,0.8,0.2,1);
  --dur:240ms;
  --lift:0 16px 30px -20px rgba(26,24,22,.6);
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  text-rendering:optimizeLegibility;
  -webkit-font-smoothing:antialiased;
}
img,svg,video{max-width:100%;display:block;}
a{color:inherit;}
button{font:inherit;color:inherit;}
h1,h2,h3,h4{
  font-family:var(--font-head);
  font-weight:900;
  line-height:1.16;
  letter-spacing:.01em;
  margin:0 0 .6em;
}
h1{font-size:clamp(2.4rem,6vw,4.5rem);}
h2{font-size:clamp(1.6rem,3.4vw,2.5rem);}
h3{font-size:clamp(1.2rem,2.2vw,1.6rem);}
p{margin:0 0 1em;}
[hidden]{display:none !important;}
::selection{background:var(--gold);color:var(--ink);}
:focus-visible{outline:2px solid var(--jade);outline-offset:2px;}

.shell{width:var(--shell);margin-inline:auto;}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;}
.skip-link{
  position:absolute;left:1rem;top:-4rem;z-index:200;
  padding:.6rem 1.1rem;background:var(--ink);color:var(--cream);
  font-size:.9rem;text-decoration:none;transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:.6rem;}

.page-main{display:block;}
.content-wrap{width:var(--shell);margin-inline:auto;padding:clamp(1.5rem,4vw,3rem) 0;}
.prose{max-width:70ch;}
.prose p{margin:0 0 1.15em;}
.prose h2{margin:2.4rem 0 .8rem;}
.prose a{color:var(--crimson);text-underline-offset:.22em;}
.prose a:hover{color:var(--jade);}
.mono{font-family:var(--font-mono);letter-spacing:.02em;}

.btn{
  display:inline-flex;align-items:center;gap:.5rem;
  padding:.75rem 1.4rem;border:1px solid var(--ink);border-radius:0;
  background:transparent;color:var(--ink);font-size:.95rem;letter-spacing:.05em;
  text-decoration:none;cursor:pointer;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.btn:hover{background:var(--ink);color:var(--cream);transform:translateY(-3px);}
.btn--primary{background:var(--crimson);border-color:var(--crimson);color:var(--cream);}
.btn--primary:hover{background:var(--ink);border-color:var(--ink);}
.btn--ghost{border-color:var(--line);color:var(--slate);}
.btn--ghost:hover{background:transparent;border-color:var(--jade);color:var(--jade);}

.breadcrumb{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.06em;}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:.45rem;margin:0;padding:0;list-style:none;color:var(--slate);}
.breadcrumb__item{display:flex;align-items:center;gap:.45rem;}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:var(--line);}
.breadcrumb__link{color:var(--crimson);text-decoration:none;}
.breadcrumb__link:hover{color:var(--jade);text-decoration:underline;}
.breadcrumb__current{color:var(--slate);}

.section{padding:clamp(2.5rem,6vw,5rem) 0;}
.section-head{margin:0 0 1.75rem;padding-top:1rem;border-top:2px solid var(--ink);}
.eyebrow{display:block;margin:0 0 .6rem;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.18em;color:var(--crimson);}
.card{
  background:var(--cream);border:1px solid var(--line);padding:1.5rem;
  transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.card:hover{transform:translateY(-4px);box-shadow:var(--lift);border-color:var(--indigo);}
.panel{background:var(--cream);border:1px solid var(--ink);border-left:4px solid var(--crimson);padding:1.5rem;}
.tag{
  display:inline-flex;align-items:center;gap:.35rem;padding:.2rem .55rem;
  border:1px solid var(--line);font-family:var(--font-mono);font-size:.68rem;
  letter-spacing:.08em;color:var(--slate);
}
.tag--indigo{border-color:var(--indigo);color:var(--indigo);}
.tag--gold{border-color:var(--gold);color:#8A6A15;}
.tag--jade{border-color:var(--jade);color:var(--jade);}
.rule{border:0;border-top:1px solid var(--line);margin:2rem 0;}

.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(1rem,2vw,2rem);}
.col-3{grid-column:span 3;}
.col-4{grid-column:span 4;}
.col-5{grid-column:span 5;}
.col-6{grid-column:span 6;}
.col-7{grid-column:span 7;}
.col-8{grid-column:span 8;}
.col-12{grid-column:span 12;}

.media-frame{
  position:relative;display:block;overflow:hidden;aspect-ratio:16/10;
  border:1px solid var(--line);
  background:linear-gradient(150deg,#DCD5CA,#B9ADA0 58%,#8F857A);
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(26,24,22,.09) 1px,transparent 1px),linear-gradient(90deg,rgba(26,24,22,.09) 1px,transparent 1px);
  background-size:34px 34px;
}
.media-frame img{width:100%;height:100%;object-fit:cover;filter:saturate(.85) contrast(1.06);}
.media-frame--tall{aspect-ratio:3/4;}
.media-frame--wide{aspect-ratio:21/9;}
.media-frame--square{aspect-ratio:1/1;}
.media-frame__caption{
  position:absolute;left:0;right:0;bottom:0;margin:0;padding:.6rem .8rem;
  background:linear-gradient(transparent,rgba(26,24,22,.85));
  color:var(--cream);font-family:var(--font-mono);font-size:.7rem;letter-spacing:.05em;
}

[data-reveal]{opacity:0;transform:translateY(14px);transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease);}
[data-reveal].is-visible{opacity:1;transform:none;}

/* ---------- 头部 ---------- */
.site-header{position:relative;z-index:70;background:var(--paper);}
.header-band{display:flex;height:6px;overflow:hidden;}
.header-band__stripe{display:block;height:100%;}
.header-band__stripe:nth-child(1){flex:3;background:var(--crimson);}
.header-band__stripe:nth-child(2){flex:1;background:var(--indigo);}
.header-band__stripe:nth-child(3){flex:2;background:var(--gold);}
.header-band__stripe:nth-child(4){flex:1;background:var(--jade);}
.header-band__stripe:nth-child(5){flex:4;background:var(--ink);}

.header-upper{background:var(--ink);color:var(--cream);}
.header-upper__inner{
  display:grid;grid-template-columns:auto minmax(0,1fr) minmax(0,300px);
  align-items:center;gap:.85rem 2.5rem;padding:.85rem 0;
}
.brand{display:inline-flex;align-items:center;gap:.75rem;text-decoration:none;color:inherit;}
.brand__mark{
  display:inline-flex;align-items:center;justify-content:center;
  width:46px;height:46px;flex:none;border:1px solid var(--gold);color:var(--gold);
  font-family:var(--font-mono);font-size:.82rem;letter-spacing:.02em;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease);
}
.brand:hover .brand__mark,.brand:focus-visible .brand__mark{background:var(--gold);color:var(--ink);}
.brand__text{display:flex;flex-direction:column;line-height:1.25;}
.brand__name{font-family:var(--font-head);font-weight:900;font-size:1.16rem;letter-spacing:.06em;}
.brand__sub{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.09em;color:var(--line);}
.header-note{
  display:flex;align-items:center;gap:.6rem;margin:0;
  font-family:var(--font-mono);font-size:.76rem;letter-spacing:.03em;color:var(--line);
}
.header-note__dot{width:8px;height:8px;flex:none;background:var(--jade);box-shadow:0 0 0 3px rgba(47,143,123,.2);}
.header-search{display:flex;flex-direction:column;gap:.3rem;min-width:0;}
.search-field{
  width:100%;padding:.5rem .75rem;border:1px solid var(--line);border-radius:0;
  background:rgba(247,244,239,.06);color:var(--cream);
  font-family:var(--font-mono);font-size:.78rem;letter-spacing:.02em;
  transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.search-field::placeholder{color:rgba(183,169,154,.8);}
.search-field:hover{border-color:var(--cream);}
.search-field:focus{outline:none;border-color:var(--jade);background:rgba(47,143,123,.14);}
.search-field:focus-visible{outline:2px solid var(--jade);outline-offset:1px;}
.search-count{margin:0;min-height:1em;font-family:var(--font-mono);font-size:.68rem;color:var(--gold);}

.header-lower{background:var(--cream);border-bottom:1px solid var(--ink);}
.header-lower__inner{display:flex;align-items:stretch;}
.site-nav{flex:1 1 auto;min-width:0;}
.site-nav__list{
  display:flex;align-items:stretch;margin:0;padding:0;list-style:none;
  overflow-x:auto;scrollbar-width:thin;
}
.site-nav__list > li{display:flex;}
.site-nav__list > li + li{border-left:1px solid var(--line);}
.site-nav__link{
  display:inline-flex;align-items:center;padding:.95rem 1.35rem;
  color:var(--ink);font-size:.95rem;letter-spacing:.05em;text-decoration:none;white-space:nowrap;
  border-bottom:3px solid transparent;
  transition:color var(--dur) var(--ease),background var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.site-nav__link:hover{color:var(--crimson);background:rgba(201,154,46,.16);}
.site-nav__link[aria-current="page"]{color:var(--crimson);background:rgba(158,43,37,.08);border-bottom-color:var(--crimson);}
.header-cta{
  align-self:center;margin-left:1.25rem;padding:.6rem 1.15rem;
  background:var(--crimson);border:1px solid var(--crimson);color:var(--cream);
  font-size:.9rem;letter-spacing:.06em;text-decoration:none;white-space:nowrap;
  transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.header-cta:hover{background:var(--ink);border-color:var(--ink);transform:translateY(-3px);}
.nav-toggle{
  display:none;align-items:center;gap:.6rem;padding:.9rem 1rem;
  background:transparent;border:0;border-right:1px solid var(--line);
  font-size:.9rem;letter-spacing:.06em;cursor:pointer;
}
.nav-toggle__bars{position:relative;width:20px;height:12px;flex:none;}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;right:0;height:2px;background:var(--ink);
  transition:transform var(--dur) var(--ease);
}
.nav-toggle__bars::before{top:0;}
.nav-toggle__bars::after{bottom:0;}
.site-header[data-open] .nav-toggle__bars::before{transform:translateY(5px) rotate(45deg);}
.site-header[data-open] .nav-toggle__bars::after{transform:translateY(-5px) rotate(-45deg);}
.nav-toggle__label{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.14em;}

.scroll-meter{position:fixed;top:0;left:0;right:0;height:3px;z-index:120;pointer-events:none;}
.scroll-meter__bar{
  display:block;height:100%;width:100%;transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--crimson),var(--gold) 55%,var(--jade));
}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--ink);color:var(--line);margin-top:clamp(3rem,7vw,6.5rem);}
.footer-ridge{display:flex;height:6px;overflow:hidden;}
.footer-ridge__stripe{display:block;height:100%;}
.footer-ridge__stripe:nth-child(1){flex:4;background:var(--ink);}
.footer-ridge__stripe:nth-child(2){flex:1;background:var(--jade);}
.footer-ridge__stripe:nth-child(3){flex:2;background:var(--gold);}
.footer-ridge__stripe:nth-child(4){flex:1;background:var(--indigo);}
.footer-ridge__stripe:nth-child(5){flex:3;background:var(--crimson);}
.footer-grid{
  display:grid;grid-template-columns:1.5fr 1fr 1fr 1.3fr;gap:2.5rem 2rem;
  padding:clamp(2.5rem,6vw,4.5rem) 0 clamp(2rem,4vw,3rem);
}
.footer-brand__name{margin:0 0 .8rem;font-family:var(--font-head);font-weight:900;font-size:1.4rem;letter-spacing:.05em;color:var(--cream);}
.footer-brand__desc{margin:0 0 1.25rem;max-width:34ch;font-size:.92rem;line-height:1.8;color:rgba(232,227,219,.72);}
.footer-brand__meta{margin:0;font-family:var(--font-mono);font-size:.7rem;letter-spacing:.16em;color:var(--gold);}
.footer-col{min-width:0;}
.footer-col__title{
  margin:0 0 1rem;padding-bottom:.6rem;border-bottom:1px solid rgba(183,169,154,.35);
  font-family:var(--font-mono);font-weight:400;font-size:.72rem;letter-spacing:.18em;color:var(--gold);
}
.footer-col__list{margin:0;padding:0;list-style:none;display:grid;gap:.6rem;}
.footer-link{
  color:rgba(232,227,219,.82);font-size:.92rem;text-decoration:none;
  transition:color var(--dur) var(--ease),padding-left var(--dur) var(--ease);
}
.footer-link:hover{color:var(--jade);padding-left:.35rem;}
.footer-contact__list{margin:0;padding:0;list-style:none;display:grid;gap:.85rem;}
.footer-contact__item{display:grid;gap:.2rem;font-size:.9rem;line-height:1.7;color:rgba(232,227,219,.86);word-break:break-all;}
.footer-contact__label{font-family:var(--font-mono);font-size:.66rem;letter-spacing:.16em;color:var(--line);}
.footer-base{border-top:1px solid rgba(183,169,154,.28);background:rgba(0,0,0,.2);}
.footer-base__inner{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem 1.75rem;padding:1.1rem 0 1.35rem;}
.footer-base__item{margin:0;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.04em;color:rgba(232,227,219,.62);}
.footer-base__item--icp{color:var(--gold);}

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .header-upper__inner{grid-template-columns:auto minmax(0,1fr);gap:.7rem 1.5rem;}
  .header-note{justify-self:end;text-align:right;}
  .header-search{grid-column:1 / -1;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:2.25rem 2rem;}
}
@media (max-width:900px){
  .nav-toggle{display:inline-flex;}
  .header-lower__inner{flex-wrap:wrap;}
  .site-nav{display:none;order:3;flex-basis:100%;border-top:1px solid var(--line);background:var(--paper);}
  .site-header[data-open] .site-nav{display:block;}
  .site-nav__list{flex-direction:column;overflow:visible;}
  .site-nav__list > li + li{border-left:0;border-top:1px solid var(--line);}
  .site-nav__link{width:100%;padding:.85rem 1rem;border-bottom:0;border-left:3px solid transparent;}
  .site-nav__link[aria-current="page"]{border-bottom:0;border-left-color:var(--crimson);}
  .header-cta{margin-left:auto;margin-right:.5rem;}
  .col-3,.col-4,.col-5{grid-column:span 6;}
  .col-7,.col-8{grid-column:span 12;}
}
@media (max-width:640px){
  :root{--shell:min(1240px,100% - 1.5rem);}
  body{font-size:16px;}
  .header-upper__inner{grid-template-columns:1fr;padding:.75rem 0;}
  .header-note{display:none;}
  .brand__mark{width:40px;height:40px;}
  .header-cta{margin-right:0;padding:.55rem .9rem;font-size:.85rem;}
  .footer-grid{grid-template-columns:1fr;}
  .footer-base__inner{flex-direction:column;align-items:flex-start;}
  .grid-12 > [class*="col-"]{grid-column:span 12;}
}
@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;}
}