/* ===== 1. 变量与重置 ===== */
:root{
  --ink:#111111;
  --gold:#C9A227;
  --gold-deep:#8A6A15;
  --brick:#8B2E2E;
  --sand:#F4E8D1;
  --paper:#FBF6EC;
  --graphite:#3A3A38;
  --line:#D9C9A6;
  --zebra:#E7DCC6;
  --ink-gold:#241D0C;

  --font-serif:"Songti SC","STSong","Noto Serif SC","Source Han Serif SC","SimSun",serif;
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --wrap:1240px;
  --gut:clamp(18px,4vw,56px);
  --ease:cubic-bezier(.22,.61,.36,1);
  --hair:1px solid var(--line);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit}
table{border-collapse:collapse;width:100%}
[hidden]{display:none !important}

body{
  background-color:var(--sand);
  background-image:
    linear-gradient(180deg,rgba(255,255,255,.42),rgba(255,255,255,0) 340px),
    repeating-linear-gradient(0deg,rgba(17,17,17,.016) 0 1px,transparent 1px 3px);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-family:var(--font-serif);font-weight:800;line-height:1.24;letter-spacing:.01em}
h1{font-size:clamp(30px,7vw,52px);font-weight:900}
h2{font-size:clamp(26px,5vw,40px);font-weight:900}
h3{font-size:clamp(19px,2.6vw,24px)}
p{line-height:1.78}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px}

.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gut)}
.section{padding-block:clamp(44px,6.5vw,96px)}
.rule-gold{height:1px;background:var(--gold);border:0}

.skip-link{
  position:absolute;left:8px;top:-100px;z-index:200;
  background:var(--ink);color:var(--paper);
  padding:10px 18px;font-family:var(--font-mono);font-size:13px;letter-spacing:.1em;
  text-decoration:none;border-bottom:2px solid var(--gold);
  transition:top .18s var(--ease);
}
.skip-link:focus{top:8px}

/* ===== 2. 页头 ===== */
.progress-rail{
  position:fixed;left:0;right:0;top:0;height:2px;z-index:120;
  background:transparent;pointer-events:none;
}
.progress-bar{
  display:block;height:100%;width:0;
  background:var(--gold);
  box-shadow:0 1px 0 rgba(138,106,21,.45);
}

.site-header{
  position:relative;z-index:90;
  background-color:var(--paper);
  background-image:
    repeating-linear-gradient(90deg,rgba(217,201,166,.34) 0 1px,transparent 1px 104px),
    radial-gradient(120% 150% at 8% -30%,rgba(201,162,39,.12),transparent 62%);
  border-bottom:1px solid var(--line);
  box-shadow:0 1px 0 rgba(17,17,17,.04);
}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  gap:clamp(16px,4vw,72px);
  padding-block:clamp(14px,2vw,22px);
}
.brand-lockup{display:flex;flex-direction:column;gap:3px;flex:0 0 auto}
.brand{
  font-family:var(--font-serif);font-weight:900;
  font-size:clamp(20px,2.4vw,27px);
  letter-spacing:.1em;line-height:1.1;
  text-decoration:none;color:var(--ink);
  padding-bottom:3px;border-bottom:2px solid var(--gold);
}
.brand:hover{color:var(--gold-deep)}
.brand-domain{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:var(--graphite);text-transform:lowercase;
}

.site-nav{flex:1 1 auto;display:flex;justify-content:flex-end}
.nav-list{display:flex;align-items:center;gap:clamp(14px,2.4vw,34px)}
.nav-list a{
  position:relative;display:inline-flex;align-items:baseline;gap:6px;
  padding:6px 2px 8px;
  font-size:15px;letter-spacing:.07em;color:var(--ink);
  text-decoration:none;white-space:nowrap;
  transition:color .2s var(--ease);
}
.nav-list a::after{
  content:"";position:absolute;left:0;right:100%;bottom:0;height:2px;
  background:var(--gold);transition:right .2s var(--ease);
}
.nav-list a:hover{color:var(--gold-deep)}
.nav-list a:hover::after{right:0}
.nav-num{display:none;font-family:var(--font-mono);font-size:11px;color:var(--gold-deep)}
.nav-list a[aria-current="page"]{font-weight:700}
.nav-list a[aria-current="page"]::after{right:0}
.nav-list a[aria-current="page"]::before{
  content:"";position:absolute;top:0;right:-8px;
  width:6px;height:6px;background:var(--brick);
}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:10px 14px;border:1px solid var(--ink);border-radius:2px;
  font-family:var(--font-mono);font-size:13px;letter-spacing:.16em;
  color:var(--ink);cursor:pointer;background:var(--sand);
  transition:background-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{background:var(--gold);color:var(--ink)}
.nav-toggle-mark{position:relative;width:16px;height:10px;display:block}
.nav-toggle-mark::before,.nav-toggle-mark::after{
  content:"";position:absolute;left:0;right:0;height:2px;background:currentColor;
  transition:transform .2s var(--ease),top .2s var(--ease);
}
.nav-toggle-mark::before{top:1px}
.nav-toggle-mark::after{top:7px}
.nav-toggle[aria-expanded="true"] .nav-toggle-mark::before{top:4px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-mark::after{top:4px;transform:rotate(-45deg)}

/* 三组栏目标签带 */
.slot-strip{
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(244,232,209,.85),rgba(244,232,209,.30));
}
.slot-strip-inner{
  display:grid;grid-template-columns:auto repeat(3,minmax(0,1fr));
  align-items:stretch;
}
.slot-strip-label{
  display:flex;align-items:center;padding-right:clamp(12px,2.4vw,32px);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.24em;
  color:var(--graphite);
}
.slot-tab{
  position:relative;display:flex;align-items:center;gap:10px;
  padding:12px clamp(10px,2vw,22px);
  border-left:1px solid var(--line);
  font-size:14px;letter-spacing:.16em;color:var(--ink);
  cursor:pointer;text-align:left;
  transition:background-color .2s var(--ease),color .2s var(--ease);
}
.slot-tab:hover{background:rgba(201,162,39,.16)}
.slot-tab-num{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--gold-deep)}
.slot-tab[aria-pressed="true"]{background:var(--sand);font-weight:700}
.slot-tab[aria-pressed="true"] .slot-tab-num{color:var(--brick)}
.slot-tab[aria-pressed="true"]::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--gold);
}
.slot-tab[aria-pressed="true"]::before{
  content:"";position:absolute;top:0;right:0;width:0;height:0;
  border-top:10px solid var(--brick);border-left:10px solid transparent;
}

/* ===== 3. 页脚 ===== */
.site-footer{
  margin-top:clamp(48px,8vw,120px);
  background-color:var(--ink-gold);
  background-image:repeating-linear-gradient(90deg,rgba(201,162,39,.12) 0 1px,transparent 1px 132px);
  color:var(--sand);
  border-top:2px solid var(--gold);
  padding-top:clamp(34px,5vw,64px);
}
.footer-inner{
  display:grid;gap:clamp(26px,4vw,52px);
  grid-template-columns:1.35fr 1fr 1fr 1.5fr;
  padding-bottom:clamp(28px,4vw,48px);
}
.footer-col{min-width:0}
.footer-brand{
  font-family:var(--font-serif);font-weight:900;
  font-size:clamp(20px,2.2vw,26px);letter-spacing:.12em;color:var(--paper);
}
.footer-domain{
  margin-top:6px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.14em;
  color:rgba(244,232,209,.68);
}
.footer-icp{
  margin-top:14px;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  color:rgba(244,232,209,.52);
}
.footer-heading{
  font-family:var(--font-mono);font-size:11.5px;font-weight:500;
  letter-spacing:.24em;color:var(--gold);
  padding-bottom:10px;margin-bottom:12px;
  border-bottom:1px solid rgba(201,162,39,.35);
}
.footer-links li + li{margin-top:8px}
.footer-links a{
  font-size:14.5px;color:rgba(244,232,209,.88);text-decoration:none;
  transition:color .2s var(--ease);
}
.footer-links a:hover{color:var(--gold);text-decoration:underline}
.footer-contact li{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:8px;
  padding-block:8px;border-bottom:1px dashed rgba(217,201,166,.24);
  font-size:14.5px;
}
.footer-label{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;
  color:var(--gold);flex:0 0 auto;
}
.footer-value{color:rgba(244,232,209,.9);word-break:break-all}
.copy-btn{
  margin-left:auto;padding:3px 10px;border:1px solid rgba(201,162,39,.55);
  border-radius:2px;font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:var(--gold);cursor:pointer;
  transition:background-color .2s var(--ease),color .2s var(--ease);
}
.copy-btn:hover{background:var(--gold);color:var(--ink-gold)}
.copy-btn.is-done{background:var(--brick);border-color:var(--brick);color:var(--paper)}
.footer-bottom{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;
  padding-block:18px 22px;
  border-top:1px solid rgba(201,162,39,.28);
}
.footer-note{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;
  color:rgba(244,232,209,.55);
}

/* ===== 4. 通用排版与内容组件 ===== */
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.24em;
  color:var(--gold-deep);text-transform:uppercase;
}
.eyebrow::before{content:"";width:28px;height:1px;background:var(--gold)}

.section-head{
  display:grid;grid-template-columns:auto minmax(0,1fr);
  gap:clamp(14px,3vw,32px);align-items:start;
  padding-bottom:18px;border-bottom:1px solid var(--gold);
}
.section-head h2{font-size:clamp(28px,6vw,44px);font-weight:900;letter-spacing:.01em}
.section-head p{margin-top:10px;color:var(--graphite);max-width:56ch}
.num-block{
  display:grid;place-items:center;
  width:clamp(46px,6vw,66px);height:clamp(46px,6vw,66px);
  font-family:var(--font-mono);font-size:clamp(15px,2vw,20px);font-weight:600;
  color:var(--gold-deep);background:var(--paper);border:1px solid var(--ink);
  transition:background-color .3s var(--ease),color .3s var(--ease),border-color .3s var(--ease);
}
.section-head.is-visible .num-block{background:var(--gold);color:var(--ink);border-color:var(--gold-deep)}

.panel{
  background:var(--paper);
  border:var(--hair);
  border-top:1px solid var(--gold);
  padding:clamp(18px,3vw,34px);
}
.prose{max-width:68ch}
.prose > * + *{margin-top:1.05em}
.prose h2{font-size:clamp(23px,3.4vw,32px);margin-top:2em}
.prose h3{font-size:clamp(18px,2.4vw,22px);margin-top:1.6em}
.prose p,.prose li{color:var(--graphite);line-height:1.8}
.prose ul,.prose ol{padding-left:1.4em}
.prose ul{list-style:square}
.prose ol{list-style:decimal}
.prose a{color:var(--gold-deep);text-underline-offset:3px}

.grid{display:grid;gap:clamp(18px,3vw,40px)}
.grid--2{grid-template-columns:minmax(0,1fr)}
.grid--asym{grid-template-columns:minmax(0,1fr)}
@media (min-width:760px){
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:900px){
  .grid--asym{grid-template-columns:minmax(0,62fr) minmax(0,38fr);align-items:start}
}

.ledger{border-top:var(--hair);border-bottom:var(--hair)}
.ledger-row{
  display:grid;grid-template-columns:84px minmax(0,1.1fr) minmax(0,1.5fr) auto;
  gap:clamp(10px,2vw,24px);align-items:baseline;
  padding:14px clamp(10px,2vw,18px);
  background:var(--paper);border-bottom:var(--hair);
  transition:background-color .2s var(--ease);
}
.ledger-row:last-child{border-bottom:0}
.ledger-row:nth-child(odd){background:var(--zebra)}
.ledger-row:hover{background:rgba(201,162,39,.2)}
.ledger-num{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--gold-deep)}
.ledger-name{font-weight:700;font-family:var(--font-serif);font-size:17px}
.ledger-note{color:var(--graphite);font-size:15px}
.ledger-meta{font-family:var(--font-mono);font-size:12px;color:var(--graphite)}

.tag{
  display:inline-block;padding:2px 9px;border:1px solid var(--gold-deep);
  border-radius:2px;font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  color:var(--gold-deep);background:rgba(201,162,39,.1);
}
.tag--brick{border-color:var(--brick);color:var(--brick);background:rgba(139,46,46,.08)}

.btn{
  position:relative;display:inline-flex;align-items:center;gap:10px;
  padding:12px 24px;border-radius:2px;overflow:hidden;
  border:1px solid var(--ink);background:transparent;color:var(--ink);
  font-size:15px;letter-spacing:.1em;text-decoration:none;cursor:pointer;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.btn::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(135deg,rgba(255,255,255,.5),rgba(255,255,255,0) 48%);
  transform:translateX(-110%);
  transition:transform .2s var(--ease);
}
.btn:hover::after,.btn:focus-visible::after{transform:translateX(0)}
.btn--gold{background:var(--gold);border-color:var(--gold-deep);color:var(--ink);font-weight:700}
.btn--gold:hover{background:var(--gold-deep);color:var(--paper)}
.btn--line:hover{background:var(--ink);color:var(--paper)}

.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;color:var(--graphite);
}
.breadcrumbs li{display:flex;align-items:center;gap:8px}
.breadcrumbs li + li::before{content:"/";color:var(--line)}
.breadcrumbs a{color:var(--gold-deep);text-decoration:none}
.breadcrumbs a:hover{text-decoration:underline}

.media-frame{
  position:relative;overflow:hidden;
  aspect-ratio:16/10;
  background:var(--zebra);border:1px solid var(--line);
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    linear-gradient(135deg,rgba(201,162,39,.14),rgba(201,162,39,0) 58%),
    repeating-linear-gradient(0deg,rgba(17,17,17,.05) 0 1px,transparent 1px 4px);
}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-frame--wide{aspect-ratio:21/9}

/* 显现动效 */
.js-ready [data-reveal]{
  opacity:0;transform:translateY(10px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
.js-ready [data-reveal].is-visible{opacity:1;transform:none}

/* ===== 5. 响应式 ===== */
@media (max-width:1000px){
  .footer-inner{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .site-nav{
    display:none;
    position:absolute;left:0;right:0;top:100%;
    background:var(--ink-gold);
    border-top:2px solid var(--gold);
    border-bottom:1px solid rgba(217,201,166,.3);
    padding:10px var(--gut) 22px;
    box-shadow:0 18px 28px rgba(17,17,17,.28);
  }
  .site-nav[data-open]{display:block}
  .nav-list{display:block}
  .nav-list li{border-bottom:1px dashed rgba(217,201,166,.24)}
  .nav-list a{
    display:flex;align-items:baseline;gap:12px;
    padding:14px 2px;font-size:16px;color:var(--sand);
  }
  .nav-list a:hover{color:var(--gold)}
  .nav-list a::after{display:none}
  .nav-num{display:inline-block;color:var(--gold);font-size:12px}
  .nav-list a[aria-current="page"]{color:var(--gold);font-weight:700}
  .nav-list a[aria-current="page"]::before{top:12px;right:2px}
  .slot-strip-inner{grid-template-columns:repeat(3,minmax(0,1fr))}
  .slot-strip-label{display:none}
  .slot-tab:first-of-type{border-left:0}
}
@media (max-width:600px){
  body{font-size:16px}
  .header-inner{flex-wrap:wrap}
  .slot-tab{padding:10px 8px;font-size:13px;letter-spacing:.08em;gap:6px}
  .footer-inner{grid-template-columns:minmax(0,1fr)}
  .ledger-row{grid-template-columns:minmax(0,1fr);gap:4px;padding:14px 12px}
  .ledger-meta{color:var(--gold-deep)}
}
@media (min-width:901px){
  body{font-size:17px}
  .site-nav{display:flex}
}

/* ===== 6. 偏好与降级 ===== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js-ready [data-reveal]{opacity:1;transform:none;transition:none}
  .btn::after{display:none}
  *,*::before,*::after{transition-duration:.01ms !important;animation-duration:.01ms !important}
}