*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
:root{
  --paper:#F4EEDF;
  --paper-2:#E6D8BE;
  --ink:#1B1A17;
  --green:#123B32;
  --gold:#C8A25A;
  --red:#A44A32;
  --gray:#637267;
  --copper:#7A5A2E;
  --cream:#FFFCF3;
  --dark-red:#6B2E24;
  --line:rgba(27,26,23,.18);
  --line-strong:rgba(27,26,23,.34);
  --gold-line:rgba(200,162,90,.32);
  --footer-text:#EDE4D2;
  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --font-hand:"Ma Shan Zheng","LXGW WenKai",cursive;
}
body{
  margin:0;
  background-color:var(--paper);
  background-image:linear-gradient(rgba(27,26,23,.032) 1px,transparent 1px);
  background-size:100% 96px;
  color:var(--ink);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
}
img,svg{display:block;max-width:100%}
a{color:inherit}
[hidden]{display:none!important}
::selection{background:var(--gold);color:var(--green)}
:focus-visible{outline:2px solid var(--red);outline-offset:3px;border-radius:0}
h1,h2,h3,h4{margin:0;font-family:var(--font-display);font-weight:700;line-height:1.3;color:var(--green);letter-spacing:.02em}
h1{font-size:clamp(2rem,4vw,3.5rem)}
h2{font-size:clamp(1.5rem,2.6vw,2.2rem)}
h3{font-size:1.15rem}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.14em}
.container{width:min(1200px,calc(100% - 3rem));margin-inline:auto}
@media (max-width:640px){.container{width:calc(100% - 1.8rem)}}

/* ---------- 通用版式 ---------- */
.section{padding-block:clamp(2.4rem,5.5vw,4.6rem);border-top:1px solid var(--line)}
.section:first-of-type{border-top:0}
.section__head{display:flex;flex-wrap:wrap;align-items:baseline;gap:.6rem 1.2rem;margin-bottom:1.6rem}
.section__title{margin:0}
.eyebrow{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.32em;text-transform:uppercase;color:var(--copper);margin:0}
.lede{font-size:1.06rem;max-width:60ch;color:#2c2b26}
.rule{height:1px;background:var(--line-strong);border:0;margin:0}
.scale-rule{height:9px;border-bottom:1px solid var(--line);background:repeating-linear-gradient(90deg,rgba(122,90,46,.5) 0 1px,transparent 1px 11px)}
.note-hand{font-family:var(--font-hand);font-size:1.06rem;line-height:1.6;letter-spacing:.04em;color:var(--copper);margin:0}
.prose{max-width:68ch}
.prose h2{font-size:1.5rem;margin:2rem 0 .7rem}
.prose h3{font-size:1.16rem;margin:1.6rem 0 .5rem}
.prose p{margin:0 0 1.1em}
.prose ul,.prose ol{margin:0 0 1.1em;padding-left:1.25em}
.prose li{margin-bottom:.4em}
.prose strong{font-weight:600}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.55rem;
  padding:.72rem 1.35rem;border:1px solid var(--green);
  background:transparent;color:var(--green);
  font-family:var(--font-body);font-size:.92rem;font-weight:500;letter-spacing:.08em;
  text-decoration:none;cursor:pointer;border-radius:0;
  transition:background .18s ease,color .18s ease,border-color .18s ease;
}
.btn:hover{background:var(--green);color:var(--cream)}
.btn--primary{background:var(--red);border-color:var(--red);color:var(--cream)}
.btn--primary:hover{background:var(--dark-red);border-color:var(--dark-red);color:var(--cream)}
.btn--ghost{border-color:var(--copper);color:var(--copper)}
.btn--ghost:hover{background:var(--copper);color:var(--cream)}

/* ---------- 面包屑 ---------- */
.breadcrumbs{margin:1.4rem 0 0}
.breadcrumbs__list{display:flex;flex-wrap:wrap;gap:.45rem;list-style:none;margin:0;padding:0;font-family:var(--font-mono);font-size:.7rem;letter-spacing:.16em;color:var(--gray)}
.breadcrumbs__item{display:flex;align-items:center;gap:.45rem}
.breadcrumbs__item + .breadcrumbs__item::before{content:"/";color:var(--gold)}
.breadcrumbs__link{text-decoration:none;color:var(--gray);border-bottom:1px solid transparent}
.breadcrumbs__link:hover{color:var(--dark-red);border-bottom-color:var(--red)}

/* ---------- 网格与卡片 ---------- */
.grid{display:grid;gap:clamp(1rem,2.2vw,1.8rem)}
.grid--split{grid-template-columns:minmax(0,.85fr) minmax(0,1.35fr)}
.grid--cards{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
@media (max-width:860px){.grid--split{grid-template-columns:1fr}}
.card{position:relative;background:var(--paper-2);border:1px solid rgba(27,26,23,.22);padding:1.25rem 1.25rem 1.4rem;transition:border-color .18s ease}
.card::before{content:"";position:absolute;top:0;left:0;width:28px;height:2px;background:var(--gold)}
.card:hover{border-color:var(--copper)}
.card__index{display:block;margin:0 0 .6rem;font-family:var(--font-mono);font-size:.68rem;letter-spacing:.24em;color:var(--copper)}
.card__title{font-size:1.1rem;margin:0 0 .55rem;color:var(--green)}
.card__text{margin:0;font-size:.95rem;color:#3a3831}

/* ---------- 图片容器 ---------- */
.media-frame{
  position:relative;overflow:hidden;aspect-ratio:var(--media-ratio,4/3);
  border:1px solid var(--line-strong);
  background:linear-gradient(155deg,#E6D8BE 0%,#DCCDAC 55%,#CFBD99 100%);
}
.media-frame::before,.media-frame::after{content:"";position:absolute;width:16px;height:16px;border:1px solid var(--copper);pointer-events:none;z-index:2}
.media-frame::before{top:8px;left:8px;border-right:0;border-bottom:0}
.media-frame::after{bottom:8px;right:8px;border-left:0;border-top:0}
.media-frame__img{width:100%;height:100%;object-fit:cover}
.media-frame__caption{display:block;margin-top:.55rem;font-family:var(--font-mono);font-size:.7rem;letter-spacing:.12em;color:var(--gray)}

/* ---------- 专题研究板 ---------- */
.board{border:1px solid var(--line-strong);background:var(--cream)}
.board__head{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:.4rem 1rem;padding:.9rem 1.1rem;background:var(--green);color:var(--footer-text)}
.board__head h3,.board__head p{color:inherit;margin:0}
.board__meta{font-family:var(--font-mono);font-size:.66rem;letter-spacing:.2em;opacity:.82}
.board__body{padding:1.15rem 1.1rem 1.3rem;font-size:.96rem}
.board__body p:last-child{margin-bottom:0}

/* ---------- 主题筛选 ---------- */
.tag-filter{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;margin:0 0 1.4rem;padding:.7rem 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.tag-filter__label{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.24em;color:var(--gray);margin-right:.4rem}
.tag-filter__btn{
  appearance:none;border:1px solid rgba(27,26,23,.3);background:transparent;color:var(--ink);
  font-family:var(--font-body);font-size:.82rem;letter-spacing:.06em;padding:.32rem .8rem;cursor:pointer;border-radius:0;
  transition:background .16s ease,color .16s ease,border-color .16s ease;
}
.tag-filter__btn:hover{border-color:var(--copper);color:var(--dark-red)}
.tag-filter__btn[aria-pressed="true"]{background:var(--red);border-color:var(--red);color:var(--cream)}
.filter-status{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.18em;color:var(--gray);margin-left:auto}

/* ---------- 显现 ---------- */
[data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .5s ease,transform .5s ease}
[data-reveal].is-revealed{opacity:1;transform:none}

/* ---------- 跳转链接与进度 ---------- */
.skip-link{
  position:absolute;left:1rem;top:-120px;z-index:90;
  background:var(--green);color:var(--cream);
  padding:.65rem 1rem;font-size:.85rem;letter-spacing:.08em;text-decoration:none;
  transition:top .18s ease;
}
.skip-link:focus{top:.8rem}
.scroll-progress{
  position:fixed;top:0;left:0;width:100%;height:3px;z-index:70;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--gold),var(--red));
  pointer-events:none;
}

/* ---------- 头部 ---------- */
.site-header{position:relative;z-index:40;background:var(--paper);border-bottom:1px solid var(--line-strong)}
.header-rule{height:10px;border-bottom:1px solid var(--line);background:repeating-linear-gradient(90deg,rgba(122,90,46,.5) 0 1px,transparent 1px 12px)}
.header-inner{padding-block:1.1rem 0}
.masthead{display:grid;grid-template-columns:1fr auto 1fr;align-items:start;gap:1rem;padding-block:1.2rem 1.3rem}
.masthead__issue{display:flex;align-items:center;gap:.55rem;margin:0;padding-top:.5rem;font-size:.66rem;letter-spacing:.24em;color:var(--copper)}
.masthead__sep{color:var(--gold);letter-spacing:0}
.masthead__center{text-align:center}
.brand{display:inline-block;text-decoration:none;color:var(--green)}
.brand__cn{position:relative;display:block;font-family:var(--font-display);font-weight:700;font-size:clamp(1.9rem,4.2vw,3.3rem);line-height:1.12;letter-spacing:.16em;color:var(--green)}
.brand__cn::after{content:"";position:absolute;left:50%;bottom:-.26em;width:100%;height:1px;background:var(--gold);transform:translateX(-50%) scaleX(0);transform-origin:center;transition:transform .18s ease}
.brand:hover .brand__cn::after,.brand:focus-visible .brand__cn::after{transform:translateX(-50%) scaleX(1)}
.brand:hover .brand__cn{color:var(--dark-red)}
.brand__en{display:block;margin-top:.55rem;font-size:.62rem;letter-spacing:.4em;color:var(--copper)}
.brand__desc{margin:.55rem 0 0;font-size:.78rem;letter-spacing:.14em;color:var(--gray)}
.masthead__side{display:flex;flex-direction:column;align-items:flex-end;gap:.4rem;justify-self:end;padding-top:.35rem;text-align:right}
.service-hours{margin:0;font-size:.74rem;letter-spacing:.06em;color:var(--gray)}
.account-link{font-size:.82rem;letter-spacing:.06em;color:var(--green);text-decoration:none;border-bottom:1px solid var(--gold);padding-bottom:1px}
.account-link:hover{color:var(--dark-red);border-bottom-color:var(--red)}
.nav-bar{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;border-top:1px solid var(--line-strong);border-bottom:1px solid var(--line);background:var(--paper)}
.site-nav{grid-column:2}
.site-nav__list{display:flex;flex-wrap:wrap;justify-content:center;gap:clamp(.4rem,1.8vw,1.9rem);list-style:none;margin:0;padding:.5rem 0}
.site-nav__link{display:inline-block;padding:.4rem .1rem;font-size:.92rem;line-height:1.4;color:var(--ink);text-decoration:none;border-bottom:1px solid transparent;transition:color .16s ease,border-color .16s ease}
.site-nav__link:hover{color:var(--dark-red);border-bottom-color:var(--gold)}
.site-nav__link[aria-current="page"]{color:var(--dark-red);border-bottom-color:var(--red);font-weight:600}
.site-nav__link[aria-current="page"]::before{content:"";display:inline-block;width:5px;height:5px;margin-right:.42rem;background:var(--red);vertical-align:.16em}
.nav-bar__note{grid-column:3;justify-self:end;margin:0;padding-right:.2rem;font-size:.62rem;letter-spacing:.3em;color:var(--gray)}
.nav-toggle{display:none;align-items:center;gap:.5rem;background:transparent;border:1px solid var(--line-strong);border-radius:0;color:var(--green);font-family:var(--font-body);font-size:.82rem;letter-spacing:.1em;padding:.42rem .7rem;cursor:pointer}
.nav-toggle__bars{display:block;width:16px;height:10px;background:
  linear-gradient(var(--green),var(--green)) 0 0/100% 1px no-repeat,
  linear-gradient(var(--green),var(--green)) 0 50%/100% 1px no-repeat,
  linear-gradient(var(--green),var(--green)) 0 100%/100% 1px no-repeat}
.nav-toggle__label{line-height:1}
.nav-toggle:hover{border-color:var(--copper);color:var(--dark-red)}
.nav-toggle[aria-expanded="true"]{background:var(--green);border-color:var(--green);color:var(--cream)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:
  linear-gradient(var(--cream),var(--cream)) 0 0/100% 1px no-repeat,
  linear-gradient(var(--cream),var(--cream)) 0 50%/100% 1px no-repeat,
  linear-gradient(var(--cream),var(--cream)) 0 100%/100% 1px no-repeat}

@media (max-width:880px){
  .header-inner{padding-block:.9rem 0}
  .masthead{grid-template-columns:1fr;justify-items:center;text-align:center;gap:.6rem;padding-block:.9rem 1rem}
  .masthead__issue{order:-1;justify-content:center;padding-top:0;font-size:.6rem;letter-spacing:.18em}
  .masthead__side{order:2;flex-direction:row;flex-wrap:wrap;align-items:center;justify-content:center;justify-self:stretch;gap:.5rem 1rem;width:100%;padding-top:.7rem;border-top:1px solid var(--line);text-align:center}
  .nav-bar{grid-template-columns:auto 1fr auto}
  .nav-toggle{display:inline-flex;grid-column:1;justify-self:start}
  .site-nav{grid-column:1 / -1;display:grid;grid-template-rows:0fr;visibility:hidden;transition:grid-template-rows .26s ease,visibility .26s ease}
  .site-header[data-open="true"] .site-nav{grid-template-rows:1fr;visibility:visible}
  .site-nav__list{flex-direction:column;flex-wrap:nowrap;gap:0;padding:0;overflow:hidden;min-height:0;background:var(--cream);border-top:1px solid var(--line)}
  .site-nav__link{display:block;padding:.75rem .9rem;border-bottom:1px solid var(--line);font-size:.98rem}
  .site-nav__link[aria-current="page"]{border-bottom-color:var(--line);background:rgba(200,162,90,.16)}
  .site-nav__link[aria-current="page"]::before{margin-right:.4rem}
  .nav-bar__note{grid-column:3;font-size:.56rem;letter-spacing:.2em}
}
@media (max-width:420px){
  .masthead__issue .mono:last-child{display:none}
  .masthead__sep{display:none}
}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--green);color:var(--footer-text);border-top:3px solid var(--gold);font-size:.92rem;margin-top:clamp(2.4rem,5vw,4rem)}
.footer-inner{display:grid;grid-template-columns:1.05fr 1.4fr 1.1fr}
.footer-inner > *{padding:clamp(1.6rem,3.4vw,2.8rem) clamp(1.1rem,2.4vw,2rem)}
.footer-inner > *:first-child{padding-inline-start:0}
.footer-inner > *:last-child{padding-inline-end:0}
.footer-brand{border-right:1px solid var(--gold-line)}
.footer-brand__name{margin:0 0 .4rem;font-family:var(--font-display);font-size:1.5rem;font-weight:700;letter-spacing:.14em;color:var(--cream)}
.footer-brand__en{margin:0 0 1.1rem;font-family:var(--font-mono);font-size:.6rem;letter-spacing:.36em;color:var(--gold)}
.footer-brand__meta{margin:0 0 .32rem;font-size:.8rem;line-height:1.8;color:rgba(237,228,210,.72)}
.footer-index__title,.footer-contact__title{margin:0 0 1rem;font-family:var(--font-mono);font-size:.64rem;letter-spacing:.3em;color:var(--gold)}
.footer-index__list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:0 .9rem}
.footer-index__link{display:flex;align-items:baseline;gap:.55rem;padding:.36rem 0;color:var(--footer-text);text-decoration:none;border-bottom:1px solid rgba(237,228,210,.14);transition:color .16s ease,border-color .16s ease}
.footer-index__link:hover{color:var(--gold);border-bottom-color:var(--gold)}
.footer-index__num{font-family:var(--font-mono);font-size:.6rem;letter-spacing:.14em;color:rgba(200,162,90,.82)}
.footer-contact{border-left:1px solid var(--gold-line)}
.footer-contact__list{list-style:none;margin:0 0 1rem;padding:0}
.footer-contact__item{padding:.18rem 0;font-size:.85rem;line-height:1.8;color:var(--footer-text)}
.footer-contact__key{display:inline-block;min-width:2.8em;margin-right:.45rem;font-family:var(--font-mono);font-size:.62rem;letter-spacing:.16em;color:var(--gold)}
.footer-note{margin:0 0 1.1rem;font-size:.76rem;line-height:1.75;color:rgba(237,228,210,.66)}
.footer-cta{display:inline-block;padding:.5rem 1rem;border:1px solid var(--gold);color:var(--cream);font-size:.8rem;letter-spacing:.1em;text-decoration:none;transition:background .18s ease,color .18s ease}
.footer-cta:hover{background:var(--gold);color:var(--green)}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.5rem 1.4rem;padding:1.1rem 0 1.5rem;border-top:1px solid var(--gold-line);font-family:var(--font-mono);font-size:.66rem;letter-spacing:.14em;color:rgba(237,228,210,.66)}
.footer-legal{margin:0}
@media (max-width:900px){
  .footer-inner{grid-template-columns:1fr}
  .footer-inner > *{padding:1.6rem 0}
  .footer-brand{border-right:0;border-bottom:1px solid var(--gold-line)}
  .footer-contact{border-left:0;border-top:1px solid var(--gold-line)}
}
@media (max-width:520px){
  .footer-index__list{grid-template-columns:1fr}
  .footer-bottom{font-size:.6rem;letter-spacing:.1em}
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
  [data-reveal]{opacity:1;transform:none;transition:none}
  .brand__cn::after{transition:none}
}