/* ===== 1. Reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,dl,dd,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,picture{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
input,select,textarea{font:inherit}
a{color:inherit}
table{border-collapse:collapse;width:100%}
[hidden]{display:none !important}

/* ===== 2. 变量 ===== */
:root{
  --gold:#C9A227;
  --gold-lt:#E3C567;
  --gold-dk:#8F7218;
  --ink:#1E1B16;
  --ink-2:#2F2A22;
  --ink-3:#3D362A;
  --stone:#4A6B6F;
  --stone-lt:#8BA7A9;
  --orange:#E07A3F;
  --paper:#F6F1E6;
  --paper-2:#E4DCCB;
  --line-light:rgba(30,27,22,.16);
  --line-dark:rgba(246,241,230,.16);
  --grid-light:rgba(74,107,111,.10);
  --grid-dark:rgba(139,167,169,.13);
  --shell:1280px;
  --cut8:polygon(0 0,calc(100% - 8px) 0,100% 8px,100% 100%,8px 100%,0 calc(100% - 8px));
  --cut12:polygon(0 0,calc(100% - 12px) 0,100% 12px,100% 100%,12px 100%,0 calc(100% - 12px));
  --fd:"Songti SC","Source Han Serif SC","Noto Serif SC",SimSun,"STSong",serif;
  --fb:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --fm:"SFMono-Regular",ui-monospace,Menlo,Consolas,"Courier New",monospace;
}

/* ===== 3. 基础排版 ===== */
body{
  font-family:var(--fb);
  font-size:16.5px;
  line-height:1.75;
  color:var(--ink);
  background-color:var(--paper);
  background-image:
    linear-gradient(var(--grid-light) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid-light) 1px,transparent 1px);
  background-size:48px 48px;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-family:var(--fd);font-weight:800;line-height:1.25;letter-spacing:-.01em}
h1{font-size:clamp(30px,4.6vw,54px)}
h2{font-size:clamp(24px,3.2vw,38px)}
h3{font-size:clamp(18px,2.2vw,24px)}
p{max-width:38em}
::selection{background:var(--gold);color:var(--ink)}
[id]{scroll-margin-top:96px}

/* ===== 4. 工具类 ===== */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:clamp(16px,3vw,32px)}
.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}
.mono{font-family:var(--fm);font-size:.9em;letter-spacing:.08em}
.kicker{font-family:var(--fm);font-size:11px;letter-spacing:.24em;color:var(--gold-dk);text-transform:uppercase}
.annotation{font-family:var(--fm);font-size:11px;letter-spacing:.2em;color:var(--stone)}
.annotation--side{writing-mode:vertical-rl;text-orientation:mixed;letter-spacing:.26em}
.rule{height:1px;border:0;background:var(--line-light)}
.section{padding-block:clamp(40px,6vw,80px)}
.section--tint{background:var(--paper-2)}
.section--dark{background:var(--ink);color:rgba(246,241,230,.82)}
.section-title{font-family:var(--fd);font-weight:800;font-size:clamp(24px,3.2vw,38px)}
.section-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:10px 18px;margin-bottom:clamp(20px,3vw,34px)}

/* ===== 5. Skip link ===== */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  transform:translateY(-180%);
  background:var(--orange);color:var(--ink);
  font-size:14px;font-weight:600;letter-spacing:.04em;
  padding:11px 18px;text-decoration:none;
  clip-path:var(--cut8);
  transition:transform .16s ease;
}
.skip-link:focus{transform:none;outline:2px solid var(--paper);outline-offset:2px}

/* ===== 6. 页头 ===== */
.site-head{
  position:sticky;top:0;z-index:80;
  background:var(--ink);
  color:var(--paper);
  border-bottom:1px solid var(--ink-3);
  box-shadow:0 1px 0 rgba(201,162,39,.28),0 14px 30px rgba(30,27,22,.22);
}
.head-bar{
  display:flex;align-items:center;
  gap:clamp(12px,2vw,26px);
  min-height:66px;padding-block:8px;
}
.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto;padding:6px 0;text-decoration:none}
.brand-mark{
  font-family:var(--fm);font-size:12px;font-weight:700;letter-spacing:.14em;
  color:var(--ink);background:var(--gold);
  padding:5px 7px;clip-path:var(--cut8);
}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-name{font-family:var(--fd);font-size:19px;font-weight:800;letter-spacing:.05em;color:var(--paper)}
.brand-desc{font-family:var(--fm);font-size:10.5px;letter-spacing:.14em;color:var(--stone-lt)}

.site-nav{flex:1 1 auto;min-width:0;display:flex;justify-content:center}
.nav-list{display:flex;align-items:center;gap:2px;flex-wrap:nowrap}
.nav-item{display:block;min-width:0}
.nav-list a{
  display:flex;align-items:baseline;gap:6px;
  padding:9px 10px;
  font-size:14.5px;letter-spacing:.02em;
  color:rgba(246,241,230,.76);
  text-decoration:none;
  border-bottom:2px solid transparent;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.nav-list a:hover{color:var(--paper);background:rgba(74,107,111,.28)}
.nav-idx{font-family:var(--fm);font-size:10px;letter-spacing:.1em;color:var(--stone-lt)}
.nav-label{white-space:nowrap}
.nav-list a[aria-current="page"]{
  color:var(--gold-lt);
  border-bottom-color:var(--gold);
  background:rgba(201,162,39,.1);
}
.nav-list a[aria-current="page"] .nav-idx{color:var(--gold)}

.head-tools{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.ver-switch{
  display:inline-flex;align-items:center;
  padding:2px;background:var(--ink-2);
  border:1px solid var(--ink-3);
}
.ver-btn{
  font-family:var(--fb);font-size:12px;letter-spacing:.04em;
  color:rgba(246,241,230,.7);
  padding:7px 10px;white-space:nowrap;
  transition:background-color .18s ease,color .18s ease;
}
.ver-btn:hover{color:var(--paper);background:rgba(74,107,111,.32)}
.ver-btn.is-on{background:var(--gold);color:var(--ink);font-weight:600}
.ver-btn.is-on:hover{background:var(--gold-lt);color:var(--ink)}
.head-cta{white-space:nowrap}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 12px;
  border:1px solid var(--ink-3);
  color:var(--paper);
  font-size:13px;letter-spacing:.06em;
}
.nav-toggle-icon{display:inline-flex;flex-direction:column;gap:3px;width:16px}
.nav-toggle-icon span{display:block;height:2px;background:var(--gold);transition:transform .2s ease,opacity .2s ease}
.nav-toggle-text{white-space:nowrap}
.nav-toggle:hover{border-color:var(--gold-dk);color:var(--gold-lt)}
.nav-toggle[aria-expanded="true"]{border-color:var(--gold);color:var(--gold-lt)}
.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)}

.scroll-meter{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:rgba(201,162,39,.16);overflow:hidden}
.scroll-meter > span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--gold-dk),var(--gold-lt));transition:width .12s linear}

/* ===== 7. 页脚 ===== */
.site-foot{
  position:relative;
  background:var(--ink);
  color:rgba(246,241,230,.76);
  border-top:2px solid var(--gold-dk);
  overflow:hidden;
}
.site-foot::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(var(--grid-dark) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid-dark) 1px,transparent 1px);
  background-size:48px 48px;
}
.site-foot > *{position:relative;z-index:1}

.foot-main{
  display:grid;
  grid-template-columns:minmax(250px,1.6fr) repeat(3,minmax(140px,1fr));
  gap:34px 28px;
  padding-block:clamp(40px,5vw,60px) 34px;
}
.foot-brand{max-width:34ch}
.foot-mark{
  display:inline-block;
  font-family:var(--fm);font-size:12px;font-weight:700;letter-spacing:.16em;
  color:var(--ink);background:var(--gold);padding:4px 7px;
  clip-path:var(--cut8);
}
.foot-brand-name{font-family:var(--fd);font-size:24px;font-weight:800;letter-spacing:.05em;color:var(--paper);margin-top:14px}
.foot-brand-desc{font-family:var(--fm);font-size:11px;letter-spacing:.16em;color:var(--stone-lt);margin-top:4px}
.foot-brand-note{font-size:13.5px;line-height:1.7;color:rgba(246,241,230,.6);margin-top:12px;max-width:32ch}
.foot-copy{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}

.copy-btn{
  font-family:var(--fm);font-size:11.5px;letter-spacing:.08em;
  padding:8px 12px;
  color:var(--gold-lt);
  background:rgba(201,162,39,.08);
  border:1px solid rgba(201,162,39,.42);
  clip-path:var(--cut8);
  transition:background-color .18s ease,border-color .18s ease,color .18s ease;
}
.copy-btn:hover{background:rgba(201,162,39,.22);border-color:var(--gold);color:var(--paper)}
.copy-btn.is-copied{background:var(--orange);border-color:var(--orange);color:var(--ink)}

.foot-col{min-width:0}
.foot-col-title{
  font-family:var(--fm);font-size:11px;letter-spacing:.22em;
  color:var(--gold);
  padding-bottom:10px;
  border-bottom:1px solid rgba(201,162,39,.3);
}
.foot-links{display:grid;gap:10px;margin-top:16px}
.foot-links a{
  display:inline-block;
  font-size:14px;
  color:rgba(246,241,230,.74);
  text-decoration:none;
  padding-bottom:1px;
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.foot-links a:hover{color:var(--gold-lt);border-bottom-color:var(--gold-dk)}

.foot-plate{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:1px;
  background:rgba(246,241,230,.14);
  border:1px solid rgba(246,241,230,.14);
}
.foot-plate-item{background:var(--ink-2);padding:16px 18px}
.foot-key{display:block;font-family:var(--fm);font-size:10.5px;letter-spacing:.2em;color:var(--stone-lt)}
.foot-val{display:block;margin-top:7px;font-size:13.5px;color:var(--paper);word-break:break-all;font-family:var(--fm);letter-spacing:.04em}

.foot-note{
  font-size:12.5px;line-height:1.8;
  color:rgba(246,241,230,.5);
  max-width:92ch;
  padding-block:20px;
  border-bottom:1px solid rgba(246,241,230,.1);
}
.foot-base{
  display:flex;flex-wrap:wrap;align-items:center;
  gap:8px 20px;
  padding-block:18px 30px;
  font-size:12.5px;
  color:rgba(246,241,230,.55);
}
.foot-link{
  color:rgba(246,241,230,.62);
  text-decoration:none;
  padding-bottom:1px;
  border-bottom:1px solid rgba(246,241,230,.22);
}
.foot-link:hover{color:var(--gold-lt);border-bottom-color:var(--gold)}

/* ===== 8. 按钮与标签 ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--fb);font-size:14px;line-height:1;letter-spacing:.03em;
  padding:12px 18px;
  text-decoration:none;text-align:center;
  border:1px solid transparent;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.btn-primary{background:var(--orange);color:var(--ink);font-weight:600;clip-path:var(--cut8)}
.btn-primary:hover{background:var(--gold-lt)}
.btn-line{border-color:rgba(201,162,39,.55);color:var(--paper)}
.btn-line:hover{border-color:var(--gold);background:rgba(201,162,39,.18);color:var(--gold-lt)}
.btn-ghost{border-color:var(--stone);color:var(--stone)}
.btn-ghost:hover{background:var(--stone);border-color:var(--stone);color:var(--paper)}
.btn-sm{padding:9px 13px;font-size:13px}
.btn-block{width:100%}

.tag{
  display:inline-block;
  font-family:var(--fm);font-size:11px;letter-spacing:.12em;
  padding:4px 8px;
  color:var(--stone);
  background:rgba(74,107,111,.14);
  border:1px solid rgba(74,107,111,.32);
}
.tag--gold{color:var(--gold-dk);background:rgba(201,162,39,.16);border-color:rgba(201,162,39,.45)}
.tag--orange{color:var(--ink);background:var(--orange);border-color:var(--orange);font-weight:700}

/* ===== 9. 网格与内容块 ===== */
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:24px}
.span-4{grid-column:span 4}
.span-6{grid-column:span 6}
.span-8{grid-column:span 8}
.span-12{grid-column:span 12}

.card{
  position:relative;
  padding:22px 22px 20px;
  background:var(--paper);
  border:1px solid var(--line-light);
  border-top:2px solid var(--gold);
}
.card--cut{background:var(--paper-2);border:0;box-shadow:inset 0 0 0 1px var(--line-light);clip-path:var(--cut12)}
.card--dark{background:var(--ink-2);border-color:rgba(246,241,230,.14);border-top-color:var(--gold-dk);color:rgba(246,241,230,.82)}
.card-title{font-family:var(--fd);font-size:19px;font-weight:800;margin-bottom:8px}
.card-meta{font-family:var(--fm);font-size:11px;letter-spacing:.16em;color:var(--stone)}
.card p{font-size:14.5px;line-height:1.7}
.card p + p{margin-top:10px}

.panel-cut{background:var(--ink-2);color:rgba(246,241,230,.82);padding:clamp(20px,3vw,28px);clip-path:var(--cut12)}
.panel-cut--paper{background:var(--paper-2);color:var(--ink)}

.breadcrumbs{font-size:13px;color:var(--stone);padding-block:16px 0}
.breadcrumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumbs li{display:flex;align-items:center;gap:8px}
.breadcrumbs li + li::before{content:"/";font-family:var(--fm);color:var(--stone-lt)}
.breadcrumbs a{color:var(--stone);text-decoration:none;border-bottom:1px solid rgba(74,107,111,.35)}
.breadcrumbs a:hover{color:var(--orange);border-bottom-color:var(--orange)}
.breadcrumbs [aria-current="page"]{color:var(--ink);font-weight:600}

.prose{max-width:36em;font-size:16.5px}
.prose > * + *{margin-top:1em}
.prose h2{margin-top:1.9em}
.prose h3{margin-top:1.5em}
.prose ul{display:grid;gap:.6em}
.prose li{position:relative;padding-left:1.3em}
.prose li::before{content:"";position:absolute;left:0;top:.75em;width:9px;height:1px;background:var(--gold-dk)}
.prose strong{color:var(--gold-dk)}
.prose a{color:var(--stone);text-decoration:underline;text-decoration-color:rgba(74,107,111,.45);text-underline-offset:3px}
.prose a:hover{color:var(--orange);text-decoration-color:var(--orange)}

.index-list{display:grid;border-top:1px solid var(--line-light)}
.index-link{
  display:flex;align-items:baseline;gap:12px;
  padding:12px 6px;
  font-size:14.5px;text-decoration:none;
  border-bottom:1px solid var(--line-light);
  transition:background-color .18s ease,color .18s ease;
}
.index-link .idx{font-family:var(--fm);font-size:11px;color:var(--stone)}
.index-link:hover{background:rgba(201,162,39,.1);color:var(--gold-dk)}
.index-link.is-active{background:rgba(201,162,39,.14);color:var(--gold-dk)}
.index-link.is-active .idx{color:var(--orange)}

.filter-bar{display:flex;flex-wrap:wrap;gap:8px}
.filter-btn{
  font-size:13.5px;letter-spacing:.03em;
  padding:8px 14px;
  color:var(--stone);
  border:1px solid rgba(74,107,111,.5);
  background:transparent;
  clip-path:var(--cut8);
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.filter-btn:hover{border-color:var(--stone);color:var(--ink);background:rgba(74,107,111,.12)}
.filter-btn[aria-pressed="true"]{background:var(--orange);border-color:var(--orange);color:var(--ink);font-weight:600}
.filter-count{font-family:var(--fm);font-size:11px;letter-spacing:.16em;color:var(--stone);align-self:center}

/* ===== 10. 图像容器基础 ===== */
figure.figure{margin:0}
.media-frame{
  position:relative;width:100%;
  aspect-ratio:4/3;
  overflow:hidden;
  background:linear-gradient(140deg,var(--ink-2) 0%,var(--stone) 58%,var(--gold-dk) 100%);
  clip-path:var(--cut12);
}
.media-frame > img,
.media-frame > svg,
.media-frame > picture > img{width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(246,241,230,.09) 1px,transparent 1px),
    linear-gradient(90deg,rgba(246,241,230,.09) 1px,transparent 1px);
  background-size:32px 32px;
}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-label{
  position:absolute;left:0;bottom:0;z-index:2;
  font-family:var(--fm);font-size:10.5px;letter-spacing:.18em;
  color:var(--ink);background:var(--gold);
  padding:5px 10px;
}
.media-caption{margin-top:10px;font-family:var(--fm);font-size:12.5px;letter-spacing:.05em;color:var(--stone)}

/* ===== 11. 滚动显现 ===== */
.has-js [data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .5s ease,transform .5s ease}
.has-js [data-reveal].is-in{opacity:1;transform:none}

/* ===== 12. 焦点与无障碍 ===== */
a:focus-visible,button:focus-visible,[tabindex]:focus-visible{
  outline:2px solid var(--orange);
  outline-offset:2px;
}

/* ===== 13. 响应式 ===== */
@media (max-width:1180px){
  .brand-desc{display:none}
  .head-cta{padding:8px 11px;font-size:12.5px}
  .nav-list a{padding:9px 8px;font-size:14px}
}

@media (max-width:1080px){
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;left:0;right:0;top:100%;
    display:none;
    background:var(--ink-2);
    border-top:1px solid rgba(201,162,39,.35);
    border-bottom:1px solid var(--gold-dk);
    padding:10px clamp(16px,3vw,32px) 16px;
    box-shadow:0 22px 44px rgba(0,0,0,.38);
  }
  .site-nav[data-open]{display:block}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-list a{
    padding:13px 6px;
    border-bottom:1px solid rgba(246,241,230,.08);
    border-left:2px solid transparent;
  }
  .nav-list a:hover{background:rgba(74,107,111,.28)}
  .nav-list a[aria-current="page"]{
    border-bottom-color:rgba(246,241,230,.08);
    border-left-color:var(--gold);
    padding-left:12px;
  }
  .nav-item:last-child a{border-bottom:0}
  .site-nav .nav-label{font-size:15px}
  .foot-main{grid-template-columns:repeat(2,minmax(0,1fr));gap:30px 24px}
  .foot-plate{grid-template-columns:repeat(2,minmax(0,1fr))}
  .span-4{grid-column:span 6}
  .span-8{grid-column:span 12}
}

@media (max-width:900px){
  .grid-12{gap:18px}
  .span-4,.span-6{grid-column:span 12}
}

@media (max-width:720px){
  .head-bar{flex-wrap:wrap;row-gap:10px;column-gap:12px;padding-block:10px}
  .brand{order:1}
  .nav-toggle{order:2;margin-left:auto}
  .head-tools{order:3;flex:1 1 100%;gap:8px}
  .head-cta{display:none}
  .ver-switch{flex:1 1 auto;justify-content:space-between}
  .ver-btn{flex:1 1 0;text-align:center}
  .site-nav{order:4;flex-basis:100%}
  .foot-main{grid-template-columns:1fr;gap:26px}
  .foot-plate{grid-template-columns:1fr}
  .foot-base{flex-direction:column;align-items:flex-start;gap:8px}
  .annotation--side{writing-mode:horizontal-tb;text-orientation:initial}
}

@media (max-width:560px){
  body{font-size:16px}
  .nav-toggle-text{display:none}
  .foot-brand{max-width:none}
}

/* ===== 14. 减少动态效果 ===== */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .has-js [data-reveal]{opacity:1;transform:none}
}