:root{
  --pine:#1F4D3A;
  --pine-2:#2F6B4F;
  --clay:#C4693B;
  --clay-2:#A9542C;
  --gold:#D9B26A;
  --gold-soft:#F0D9A8;
  --cream:#F6F1E7;
  --paper:#FBF8F1;
  --ink:#20302A;
  --sage:#6B7A6F;
  --line:rgba(31,77,58,.15);
  --line-strong:rgba(31,77,58,.3);
  --shadow-1:0 1px 0 rgba(32,48,42,.05),0 14px 32px -22px rgba(31,77,58,.5);
  --shadow-2:0 22px 52px -30px rgba(31,77,58,.6);
  --radius:6px;
  --shell-w:1180px;
  --gutter:clamp(16px,4vw,40px);
  --font-serif:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",Georgia,serif;
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
*,*::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:17px;
  line-height:1.65;
  color:var(--ink);
  background-color:var(--cream);
  background-image:
    radial-gradient(1100px 560px at 8% -12%,rgba(217,178,106,.20),transparent 62%),
    radial-gradient(900px 480px at 102% 2%,rgba(196,105,59,.12),transparent 64%),
    repeating-linear-gradient(0deg,rgba(31,77,58,.025) 0 1px,transparent 1px 4px);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-family:var(--font-serif);font-weight:600;line-height:1.18;color:var(--pine);margin:0}
p{margin:0 0 1em}
a{color:var(--clay-2);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{text-decoration-color:var(--gold)}
ul,ol{margin:0;padding:0}
li{list-style:none}
img,svg{max-width:100%;display:block}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--clay);outline-offset:3px;border-radius:2px}
.visually-hidden{position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.shell{width:100%;max-width:var(--shell-w);margin-inline:auto;padding-inline:var(--gutter)}
.skip-link{
  position:fixed;top:0;left:50%;z-index:200;
  transform:translate(-50%,-140%);
  background:var(--gold);color:#1B3A2C;
  font-family:var(--font-mono);font-size:13px;letter-spacing:.04em;
  padding:10px 18px;border-radius:0 0 6px 6px;text-decoration:none;
  transition:transform .2s ease-out;
}
.skip-link:focus{transform:translate(-50%,0)}
/* ---------- 双层页头 ---------- */
.header-meta{
  background:var(--pine);
  background-image:
    radial-gradient(620px 260px at 88% -40%,rgba(217,178,106,.22),transparent 68%),
    repeating-linear-gradient(135deg,rgba(246,241,231,.035) 0 1px,transparent 1px 7px);
  color:var(--cream);
  border-bottom:1px solid rgba(217,178,106,.5);
}
.header-meta__inner{
  display:flex;align-items:center;gap:clamp(14px,2.4vw,32px);
  flex-wrap:wrap;padding-block:13px;
}
.header-brand{
  display:inline-flex;align-items:center;gap:12px;
  text-decoration:none;color:inherit;flex:0 0 auto;
}
.header-brand__mark{
  width:36px;height:36px;flex:0 0 36px;
  display:grid;place-items:center;
  font-family:var(--font-serif);font-size:18px;font-weight:600;
  color:var(--gold);
  border:1px solid rgba(217,178,106,.62);
  border-radius:4px;
  background:rgba(246,241,231,.06);
  box-shadow:inset 0 0 0 1px rgba(246,241,231,.06);
}
.header-brand__text{display:flex;flex-direction:column;line-height:1.32}
.header-brand__name{
  font-family:var(--font-serif);font-size:17px;font-weight:600;
  letter-spacing:.06em;color:var(--cream);
}
.header-brand__line{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;
  color:rgba(246,241,231,.62);
}
.header-brand:hover .header-brand__name{color:var(--gold-soft)}
.header-meta__utility{
  flex:1 1 260px;margin:0;
  font-size:12.5px;line-height:1.55;
  color:rgba(246,241,231,.66);
  max-width:52ch;
}
.header-tags{
  display:flex;flex-wrap:wrap;gap:8px;margin:0;flex:0 0 auto;
}
.tag{
  display:inline-block;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.05em;
  padding:4px 10px;border-radius:3px;white-space:nowrap;
  background:var(--gold-soft);color:#3C2E12;border:1px solid rgba(169,84,44,.28);
}
.tag--gold{
  background:rgba(217,178,106,.18);color:var(--gold);
  border:1px solid rgba(217,178,106,.55);
}
.tag--clay{
  background:rgba(196,105,59,.2);color:#F2C7AE;
  border:1px solid rgba(196,105,59,.6);
}
.header-nav{
  position:sticky;top:0;z-index:100;
  background:rgba(251,248,241,.97);
  border-bottom:1px solid var(--line-strong);
  box-shadow:0 12px 26px -24px rgba(31,77,58,.9);
}
.header-nav__inner{
  position:relative;
  display:flex;align-items:center;justify-content:space-between;
  gap:clamp(12px,2vw,28px);
  padding-block:9px;
}
.primary-nav{min-width:0}
.primary-nav__list{
  display:flex;align-items:center;flex-wrap:wrap;gap:4px;
  counter-reset:navitem;
}
.primary-nav__link{
  display:inline-block;position:relative;
  padding:9px 13px;border-radius:4px 4px 2px 2px;
  font-size:15px;letter-spacing:.02em;
  color:var(--ink);text-decoration:none;
  transition:background .18s ease,color .18s ease;
}
.primary-nav__link::before{
  counter-increment:navitem;
  content:counter(navitem,decimal-leading-zero);
  font-family:var(--font-mono);font-size:10.5px;
  color:var(--sage);margin-right:6px;vertical-align:2px;
}
.primary-nav__link:hover{background:rgba(217,178,106,.2);color:var(--pine)}
.primary-nav__link[aria-current="page"]{
  background:var(--gold);color:#1B3A2C;font-weight:600;
  box-shadow:inset 0 -2px 0 rgba(31,77,58,.35);
}
.primary-nav__link[aria-current="page"]::before{color:#3C2E12}
.header-nav__actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.header-nav__cta{
  display:inline-flex;align-items:center;
  padding:9px 18px;border-radius:4px;
  background:var(--clay);color:#FFF6EC;
  font-size:14px;letter-spacing:.03em;text-decoration:none;
  box-shadow:inset 0 -2px 0 rgba(32,48,42,.22);
  transition:background .18s ease,transform .18s ease;
}
.header-nav__cta:hover{background:var(--clay-2);text-decoration:none;transform:translateY(-1px)}
.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:8px 13px;border-radius:4px;cursor:pointer;
  background:var(--paper);color:var(--pine);
  border:1px solid var(--line-strong);
  font-size:13px;letter-spacing:.06em;
}
.nav-toggle__bars{
  position:relative;width:18px;height:2px;background:currentColor;border-radius:2px;
  transition:background .18s ease;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:currentColor;
  border-radius:2px;transition:transform .2s ease-out,top .2s ease-out;
}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{top:0;transform:rotate(-45deg)}
.scroll-meter{
  position:absolute;left:0;right:0;bottom:0;height:2px;
  background:rgba(31,77,58,.1);pointer-events:none;
}
.scroll-meter__bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--pine-2),var(--gold));
  transition:width .12s linear;
}
/* ---------- 页脚 ---------- */
.site-footer{
  margin-top:clamp(48px,8vw,104px);
  padding-block:clamp(40px,6vw,76px) 0;
  color:rgba(246,241,231,.82);
  background-color:var(--pine);
  background-image:
    radial-gradient(720px 340px at 92% -10%,rgba(217,178,106,.17),transparent 66%),
    radial-gradient(560px 300px at 0% 110%,rgba(196,105,59,.16),transparent 62%),
    repeating-linear-gradient(135deg,rgba(246,241,231,.03) 0 1px,transparent 1px 7px);
  border-top:2px solid var(--gold);
}
.footer-top{
  display:grid;grid-template-columns:4fr 8fr;
  gap:clamp(28px,4.5vw,64px);
  align-items:start;
}
.footer-brand__mark{
  margin:0 0 14px;
  font-family:var(--font-serif);font-size:clamp(26px,3.2vw,38px);font-weight:600;
  letter-spacing:.08em;color:var(--cream);
}
.footer-brand__summary{
  margin:0;max-width:32ch;
  font-size:15px;line-height:1.72;color:rgba(246,241,231,.72);
}
.footer-routes{margin-top:24px;display:grid;gap:0}
.footer-routes__item{
  display:flex;align-items:baseline;gap:12px;
  padding:9px 0;font-size:15px;color:rgba(246,241,231,.9);
  border-bottom:1px dashed rgba(246,241,231,.18);
}
.footer-routes__num{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:var(--gold);
}
.footer-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(20px,3vw,36px)}
.footer-col__title{
  margin:0 0 14px;
  font-family:var(--font-mono);font-size:11.5px;font-weight:400;letter-spacing:.16em;
  color:var(--gold);text-transform:uppercase;
}
.footer-list{display:grid;gap:10px}
.footer-link{
  color:rgba(246,241,231,.85);text-decoration:none;
  border-bottom:1px solid transparent;padding-bottom:1px;
  transition:color .18s ease,border-color .18s ease;
  font-size:15px;
}
.footer-link:hover{color:var(--gold-soft);border-bottom-color:rgba(217,178,106,.7)}
.footer-text{display:block;font-size:14.5px;line-height:1.62;color:rgba(246,241,231,.7)}
.footer-mono{
  display:block;font-family:var(--font-mono);font-size:13px;letter-spacing:.01em;
  color:var(--cream);word-break:break-word;
}
.footer-bottom{
  margin-top:clamp(32px,5vw,60px);
  border-top:1px solid rgba(246,241,231,.16);
  padding-block:18px 26px;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 24px;
}
.footer-legal{
  margin:0;display:flex;flex-wrap:wrap;align-items:center;gap:6px 14px;
  font-size:12.5px;color:rgba(246,241,231,.6);
}
.footer-legal__link{
  color:rgba(246,241,231,.8);text-decoration:none;
  border-bottom:1px solid rgba(246,241,231,.26);padding-bottom:1px;
}
.footer-legal__link:hover{color:var(--gold-soft);border-bottom-color:rgba(217,178,106,.7)}
.footer-dot{color:rgba(246,241,231,.34)}
.footer-note{
  margin:0;font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;
  color:rgba(246,241,231,.55);
}
/* ---------- 通用组件 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:4px;border:1px solid transparent;
  font-family:var(--font-sans);font-size:15px;line-height:1.2;
  text-decoration:none;cursor:pointer;
  transition:background .18s ease,color .18s ease,border-color .18s ease,transform .18s ease;
}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn--primary{background:var(--pine);color:var(--cream);box-shadow:inset 0 -2px 0 rgba(32,48,42,.28)}
.btn--primary:hover{background:var(--pine-2)}
.btn--ghost{background:transparent;color:var(--pine);border-color:var(--line-strong)}
.btn--ghost:hover{border-color:var(--clay);color:var(--clay-2)}
.eyebrow{
  display:block;margin:0 0 12px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--sage);
}
.mono-num{font-family:var(--font-mono);font-size:13px;letter-spacing:.06em;color:var(--clay)}
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:7px;
  font-family:var(--font-mono);font-size:12.5px;color:var(--sage);
  margin:0 0 22px;
}
.breadcrumb__link{color:var(--sage);text-decoration:none;border-bottom:1px solid transparent}
.breadcrumb__link:hover{color:var(--clay-2);border-bottom-color:var(--gold)}
.breadcrumb__sep{color:rgba(107,122,111,.6)}
.section{padding-block:clamp(44px,7vw,92px)}
.section--tight{padding-block:clamp(28px,4vw,52px)}
.section__head{max-width:660px;margin-bottom:clamp(20px,3vw,36px)}
.section__title{font-size:clamp(28px,4vw,40px);letter-spacing:.01em}
.section__lead{margin:14px 0 0;font-size:16.5px;line-height:1.75;color:var(--sage)}
.layout-split{display:grid;grid-template-columns:5fr 7fr;gap:clamp(24px,4vw,56px);align-items:start}
.layout-split--reverse{grid-template-columns:7fr 5fr}
.layout-split__aside{position:relative}
.layout-split__main{min-width:0}
.panel{
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:clamp(18px,3vw,34px);
  box-shadow:var(--shadow-1);
}
.list-strip{
  display:grid;grid-template-columns:auto 1fr auto auto;
  align-items:center;gap:clamp(12px,2vw,28px);
  padding:17px clamp(14px,2vw,22px);
  background:var(--paper);
  border:1px solid var(--line);
  border-left:3px solid var(--gold);
  border-radius:2px 6px 6px 2px;
  color:var(--ink);text-decoration:none;
  transition:transform .18s ease,box-shadow .18s ease,border-left-color .18s ease;
}
.list-strip:hover{transform:translateX(3px);box-shadow:var(--shadow-1);border-left-color:var(--clay);text-decoration:none}
.list-strip__num{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--sage)}
.list-strip__title{font-family:var(--font-serif);font-size:clamp(16px,2vw,20px);color:var(--pine)}
.list-strip__meta{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.05em;
  padding:4px 9px;border-radius:3px;
  background:rgba(217,178,106,.24);color:#4A3A18;white-space:nowrap;
}
.index-tabs{display:flex;flex-wrap:wrap;gap:8px;margin:0}
.index-tab{
  padding:8px 15px;border-radius:3px;cursor:pointer;
  background:var(--paper);color:var(--pine);
  border:1px solid var(--line-strong);
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.05em;
  transition:background .18s ease,color .18s ease,border-color .18s ease;
}
.index-tab:hover{border-color:var(--gold);background:rgba(240,217,168,.35)}
.index-tab[aria-pressed="true"]{
  background:var(--gold);color:#1B3A2C;border-color:var(--gold);
  box-shadow:inset 0 -2px 0 rgba(31,77,58,.28);
}
.media-frame{
  position:relative;overflow:hidden;
  padding:6px;border-radius:var(--radius);
  border:1px solid var(--line-strong);
  background:
    linear-gradient(155deg,rgba(31,77,58,.12),rgba(217,178,106,.24) 55%,rgba(196,105,59,.16));
  box-shadow:var(--shadow-1);
}
.media-frame > img{
  width:100%;height:auto;aspect-ratio:16/10;object-fit:cover;
  border-radius:3px;background:var(--paper);
}
.media-frame--tall > img{aspect-ratio:4/5}
.media-frame__caption{
  margin:10px 4px 2px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.04em;
  color:var(--sage);
}
.prose{max-width:700px;font-size:17px;line-height:1.75}
.prose p{margin:0 0 1.15em}
.prose h2{font-size:clamp(23px,3vw,30px);margin:1.6em 0 .6em}
.prose h3{font-size:19px;margin:1.4em 0 .5em}
.prose ul,.prose ol{padding-left:1.25em;margin:0 0 1.15em}
.prose ul li{list-style:disc}
.prose ol li{list-style:decimal}
.prose li{margin-bottom:.4em}
.prose blockquote{
  margin:1.4em 0;padding:4px 0 4px 18px;
  border-left:3px solid var(--clay);
  font-family:var(--font-serif);font-size:18px;color:var(--pine-2);
}
.prose a{color:var(--clay-2)}
.rule{height:1px;border:0;background:var(--line-strong);margin:clamp(28px,4vw,52px) 0}
/* ---------- 动效 ---------- */
html.has-reveal [data-reveal]{opacity:0;transform:translateY(14px)}
html.has-reveal [data-reveal].is-revealed{
  opacity:1;transform:none;
  transition:opacity .3s ease-out,transform .3s ease-out;
}
/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .footer-top{grid-template-columns:1fr;gap:clamp(24px,4vw,40px)}
  .footer-brand__summary{max-width:46ch}
}
@media (max-width:900px){
  .header-meta__utility{display:none}
  .header-nav__cta{display:none}
  .nav-toggle{display:inline-flex}
  .primary-nav{
    position:absolute;left:0;right:0;top:100%;
    background:var(--paper);
    border-bottom:1px solid var(--line-strong);
    box-shadow:var(--shadow-2);
    max-height:0;overflow:hidden;opacity:0;visibility:hidden;
    transition:max-height .26s ease-out,opacity .2s ease-out,visibility .2s;
  }
  .primary-nav[data-open="true"]{
    max-height:78vh;overflow-y:auto;opacity:1;visibility:visible;
  }
  .primary-nav__list{
    flex-direction:column;align-items:stretch;
    gap:0;padding:10px var(--gutter) 18px;
  }
  .primary-nav__link{
    display:block;padding:13px 8px;border-radius:0;
    border-bottom:1px dashed var(--line);
    font-size:16px;
  }
  .primary-nav__link[aria-current="page"]{box-shadow:none;background:var(--gold);color:#1B3A2C}
  .layout-split,.layout-split--reverse{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:640px){
  body{font-size:16px;line-height:1.68}
  .header-meta__inner{padding-block:11px;gap:10px}
  .header-brand__line{display:none}
  .header-tags{gap:6px}
  .tag{font-size:10.5px;padding:3px 8px}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .list-strip{grid-template-columns:auto 1fr;row-gap:6px}
  .list-strip__meta{grid-column:2;justify-self:start}
}
@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-reveal [data-reveal]{opacity:1;transform:none}
}