*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background-color:var(--paper);
  background-image:
    radial-gradient(circle at 12% -6%,rgba(201,163,91,.17),transparent 44%),
    radial-gradient(circle at 94% 4%,rgba(140,167,182,.15),transparent 40%);
  color:var(--text);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.78;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
img,svg{display:block;max-width:100%}
h1,h2,h3,h4,p,figure{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
button{font:inherit;color:inherit}
a{color:inherit}
[hidden]{display:none !important}
:focus-visible{outline:3px solid var(--coral);outline-offset:3px}
[data-reveal]{will-change:transform,opacity}

:root{
  --ink:#0C3B34;
  --ink-2:#145248;
  --gold:#C9A35B;
  --gold-soft:#EAD7A6;
  --coral:#E36F4D;
  --mist:#8CA7B6;
  --paper:#F5F0E6;
  --cream:#FBF8F1;
  --text:#17201D;
  --muted:#61746D;
  --line:rgba(23,32,29,.14);
  --line-strong:rgba(12,59,52,.30);
  --cut:16px;
  --font-head:"Montserrat","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"IBM Plex Mono","SFMono-Regular",Consolas,monospace;
  --container:1180px;
  --gutter:clamp(18px,4vw,56px);
}

/* ============ 通用容器与排版 ============ */
.container{width:min(calc(100% - 2 * var(--gutter)),var(--container));margin-inline:auto}
.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}
.section{padding-block:clamp(48px,7vw,96px)}
.section--cream{background:var(--cream)}
.section--ink{background:var(--ink);color:var(--cream)}
.section--ink .lede{color:rgba(251,248,241,.76)}
.section--ink .eyebrow{color:var(--gold)}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--muted);
}
.lede{font-size:clamp(16px,1.6vw,18.5px);line-height:1.8;color:var(--muted);max-width:58ch}
.index-tag{
  display:inline-flex;align-items:center;gap:8px;
  padding:5px 13px;background:var(--gold-soft);color:var(--ink);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;
  clip-path:polygon(9px 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%,0 9px);
}
.cut-panel{
  position:relative;
  padding:clamp(20px,3vw,34px);
  background:var(--cream);
  box-shadow:inset 0 0 0 1px var(--line-strong);
  clip-path:polygon(var(--cut) 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%,0 var(--cut));
}
.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:12px 28px;padding-bottom:clamp(16px,2.2vw,26px);
  border-bottom:1px solid var(--line-strong);
  margin-bottom:clamp(24px,3.4vw,44px);
}
.section-head__title{
  font-family:var(--font-head);font-weight:300;
  font-size:clamp(30px,4.6vw,56px);line-height:1.06;letter-spacing:-.01em;
  color:var(--ink);
}
.section-head__title strong{font-weight:800}
.section-head__index{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.24em;
  color:var(--gold);white-space:nowrap;
}
.section--ink .section-head{border-color:rgba(234,215,166,.30)}
.section--ink .section-head__title{color:var(--cream)}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:13px 26px;
  font-family:var(--font-head);font-size:14.5px;font-weight:700;letter-spacing:.06em;
  text-decoration:none;border:0;cursor:pointer;
  background:var(--ink);color:var(--gold-soft);
  transition:background-color .25s ease,color .25s ease,transform .25s ease;
  clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
}
.btn:hover{transform:translateY(-1px)}
.btn--gold{background:var(--gold);color:var(--ink)}
.btn--gold:hover{background:var(--gold-soft)}
.btn--primary{background:var(--ink);color:var(--gold-soft)}
.btn--primary:hover{background:var(--ink-2);color:var(--cream)}
.btn--ghost{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--line-strong)}
.btn--ghost:hover{background:rgba(201,163,91,.18)}
.btn--small{padding:9px 18px;font-size:13px}

/* ============ 跳至主内容 ============ */
.skip-link{
  position:fixed;top:8px;left:50%;z-index:400;
  transform:translate(-50%,-180%);
  padding:11px 24px;background:var(--ink);color:var(--gold-soft);
  font-family:var(--font-mono);font-size:13px;letter-spacing:.1em;text-decoration:none;
  border-radius:2px;transition:transform .25s ease;
}
.skip-link:focus-visible{transform:translate(-50%,0);outline-color:var(--gold)}

/* ============ 头部 ============ */
.site-header{position:relative;z-index:60;background:var(--cream);border-bottom:1px solid var(--line-strong)}
.header-rail{background:var(--ink);color:var(--gold-soft)}
.header-rail__inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:6px 20px;padding-block:8px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.2em;
}
.header-rail__note{margin:0}
.header-rail__meta{margin:0;color:rgba(234,215,166,.68)}

.masthead{position:relative;overflow:hidden;padding:clamp(20px,4vw,42px) 0 clamp(14px,2.4vw,24px)}
.masthead::before{
  content:"";position:absolute;top:-40%;right:-12%;width:54%;height:180%;
  background:linear-gradient(112deg,rgba(201,163,91,.22),rgba(140,167,182,.12) 62%,transparent);
  clip-path:polygon(22% 0,100% 0,100% 100%,0 100%);
  pointer-events:none;
}
.masthead::after{
  content:"";position:absolute;left:-8%;bottom:-10%;width:34%;height:60%;
  background:linear-gradient(300deg,rgba(227,111,77,.13),transparent 70%);
  clip-path:polygon(0 0,100% 32%,100% 100%,0 100%);
  pointer-events:none;
}
.masthead__inner{position:relative;display:flex;justify-content:center;text-align:center}
.brand{display:inline-flex;flex-direction:column;align-items:center;gap:8px;text-decoration:none;padding:4px 8px}
.brand::before{
  content:"";display:block;width:44px;height:2px;background:var(--gold);margin-bottom:6px;
}
.brand__name{
  font-family:var(--font-head);font-weight:800;
  font-size:clamp(26px,4.8vw,46px);line-height:1.04;letter-spacing:.16em;
  color:var(--ink);
}
.brand__line{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.26em;
  text-transform:uppercase;color:var(--muted);
}

.nav-shell{background:var(--cream);border-top:1px solid rgba(201,163,91,.5)}
.nav-shell__inner{
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;
  gap:14px;min-height:58px;
}
.nav-toggle{display:none}
.nav-toggle__bars{
  position:relative;display:block;width:18px;height:2px;background:currentColor;
  transition:background-color .22s ease;
}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:currentColor;
  transition:top .25s ease,transform .25s ease;
}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.site-header[data-open] .nav-toggle__bars{background:transparent}
.site-header[data-open] .nav-toggle__bars::before{top:0;transform:rotate(45deg)}
.site-header[data-open] .nav-toggle__bars::after{top:0;transform:rotate(-45deg)}

.primary-nav{grid-column:2;justify-self:center}
.primary-nav__list{display:flex;align-items:center;gap:clamp(6px,1.8vw,24px)}
.primary-nav__item{position:relative}
.primary-nav__link{
  position:relative;display:inline-block;padding:12px 6px;
  font-size:15px;font-weight:500;letter-spacing:.06em;color:var(--ink);
  text-decoration:none;transition:color .22s ease;
}
.primary-nav__link::after{
  content:"";position:absolute;left:6px;right:6px;bottom:6px;height:2px;
  background:var(--gold);transform:scaleX(0);transform-origin:left center;
  transition:transform .3s ease,background-color .22s ease;
}
.primary-nav__link:hover,.primary-nav__link:focus-visible{color:var(--ink-2)}
.primary-nav__link:hover::after,.primary-nav__link:focus-visible::after{transform:scaleX(1)}
.primary-nav__link[aria-current="page"]{font-weight:700}
.primary-nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--coral)}
.primary-nav__link--accent{font-weight:700;color:var(--ink-2)}
.primary-nav__link--accent::before{
  content:"";position:absolute;left:-9px;top:50%;width:6px;height:6px;
  margin-top:-3px;background:var(--coral);transform:rotate(45deg);
}
.nav-shell__cta{grid-column:3;justify-self:end}

/* ============ 面包屑 ============ */
.breadcrumb{padding-block:14px;border-bottom:1px solid var(--line);background:var(--cream)}
.breadcrumb__list{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--muted);
}
.breadcrumb__item{display:flex;align-items:center;gap:8px}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:var(--gold);font-size:11px}
.breadcrumb__link{text-decoration:none;color:var(--muted);transition:color .2s ease}
.breadcrumb__link:hover,.breadcrumb__link:focus-visible{color:var(--ink)}
.breadcrumb__current{color:var(--ink);font-weight:600}

/* ============ 非对称网格 ============ */
.split{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(16px,2.4vw,32px)}
.split__aside{grid-column:1 / span 3}
.split__main{grid-column:5 / span 8}

/* ============ 图版占位 ============ */
.figure-frame{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:16 / 10;
  background:linear-gradient(152deg,var(--ink-2),var(--ink) 58%,#0a2f2a);
  box-shadow:inset 0 0 0 1px rgba(201,163,91,.35);
  clip-path:polygon(18px 0,100% 0,100% calc(100% - 18px),calc(100% - 18px) 100%,0 100%,0 18px);
}
.figure-frame img{width:100%;height:100%;object-fit:cover}
.figure-frame__placeholder{
  position:absolute;inset:0;display:grid;place-items:center;text-align:center;
  padding:clamp(14px,3vw,28px);
  color:var(--gold-soft);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.24em;text-transform:uppercase;
  background-image:
    radial-gradient(circle at 24% 16%,rgba(201,163,91,.30),transparent 56%),
    linear-gradient(118deg,transparent 46%,rgba(140,167,182,.22) 46%,rgba(140,167,182,.22) 52%,transparent 52%);
}
.figure-frame--wide{aspect-ratio:21 / 9}
.figure-frame--tall{aspect-ratio:3 / 4}
.figure-frame--square{aspect-ratio:1 / 1}
.figure-frame__caption{
  margin-top:10px;font-family:var(--font-mono);font-size:11.5px;
  letter-spacing:.12em;color:var(--muted);
}

/* ============ 章节色带 ============ */
.chapter-band{
  background:var(--ink);color:var(--gold-soft);
  border-block:1px solid rgba(201,163,91,.32);
  padding-block:clamp(13px,2vw,20px);
}
.chapter-band__inner{display:flex;flex-wrap:wrap;align-items:baseline;gap:8px 24px}
.chapter-band__index{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.26em;color:var(--gold);
}
.chapter-band__title{
  font-family:var(--font-head);font-weight:300;
  font-size:clamp(19px,2.4vw,27px);letter-spacing:.09em;color:var(--cream);
}

/* ============ 主题筛选 ============ */
.filter-bar{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  padding-block:14px;
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
.filter-bar__label{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--muted);margin-right:4px;
}
.chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:9px 18px;border:1px solid var(--line-strong);border-radius:999px;
  background:transparent;color:var(--ink);
  font-size:13.5px;font-weight:600;letter-spacing:.06em;cursor:pointer;
  transition:background-color .22s ease,color .22s ease,border-color .22s ease,transform .22s ease;
}
.chip:hover{background:rgba(201,163,91,.20);transform:translateY(-1px)}
.chip[aria-pressed="true"]{background:var(--coral);border-color:var(--coral);color:var(--ink)}
.chip__count{font-family:var(--font-mono);font-size:11px;letter-spacing:.04em;opacity:.72}
.is-filtered{display:none !important}
.empty-note{
  padding:26px 22px;border:1px dashed var(--line-strong);
  font-family:var(--font-mono);font-size:13px;letter-spacing:.1em;color:var(--muted);
}

/* ============ 时间轴 ============ */
.timeline{position:relative;padding-left:30px}
.timeline::before{
  content:"";position:absolute;left:6px;top:8px;bottom:8px;width:1px;
  background:linear-gradient(var(--gold),rgba(201,163,91,.18));
}
.timeline__item{position:relative;padding-bottom:clamp(20px,2.6vw,32px)}
.timeline__item::before{
  content:"";position:absolute;left:-29px;top:7px;width:12px;height:12px;
  border:2px solid var(--gold);background:var(--paper);transform:rotate(45deg);
}
.section--ink .timeline__item::before{background:var(--ink)}
.timeline__body{margin:0;font-size:16px;line-height:1.78}
.timeline__meta{
  display:block;margin-bottom:4px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.2em;
  color:var(--gold);
}

/* ============ 滚动进度 ============ */
.scroll-progress{
  position:fixed;top:0;left:0;z-index:400;
  width:100%;height:3px;transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--gold),var(--coral));
  pointer-events:none;
}

/* ============ 显现 ============ */
.js [data-reveal]{opacity:0;transform:translateY(18px);transition:opacity .5s ease,transform .5s ease}
.js [data-reveal].is-revealed{opacity:1;transform:none}

/* ============ 页脚 ============ */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(32px,5vw,64px);
  padding-top:clamp(38px,5.5vw,66px);
  background:var(--ink);color:var(--gold-soft);
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:6px;
  background:linear-gradient(90deg,var(--gold) 0 22%,var(--coral) 22% 34%,var(--mist) 34% 100%);
}
.site-footer::after{
  content:"";position:absolute;right:-14%;bottom:-30%;width:46%;height:110%;
  background:linear-gradient(140deg,rgba(201,163,91,.13),transparent 68%);
  clip-path:polygon(30% 0,100% 0,100% 100%,0 100%);
  pointer-events:none;
}
.footer__top{
  position:relative;z-index:1;
  display:grid;grid-template-columns:1.45fr 1fr;
  gap:clamp(24px,4vw,56px);
  padding-bottom:clamp(26px,4vw,44px);
  border-bottom:1px solid rgba(234,215,166,.22);
}
.footer__brand{
  font-family:var(--font-head);font-weight:800;
  font-size:clamp(21px,2.9vw,30px);letter-spacing:.1em;color:var(--cream);
}
.footer__tagline{
  margin-top:12px;font-size:15px;line-height:1.72;
  color:rgba(251,248,241,.74);max-width:34em;
}
.footer__status{
  display:inline-flex;align-items:flex-start;gap:10px;
  margin-top:18px;padding:10px 16px;max-width:32em;
  font-size:13.5px;line-height:1.6;
  background:rgba(201,163,91,.14);border:1px solid rgba(201,163,91,.36);
  color:var(--gold-soft);
}
.footer__status::before{
  content:"";flex:none;width:8px;height:8px;margin-top:7px;
  border-radius:50%;background:var(--coral);
}
.footer__contact{display:grid;gap:10px;font-size:14px;line-height:1.72;color:rgba(251,248,241,.78)}
.footer__contact p{margin:0}
.footer__contact strong{
  display:block;font-family:var(--font-mono);font-size:11px;font-weight:400;
  letter-spacing:.2em;text-transform:uppercase;color:rgba(234,215,166,.66);
}
.footer__heading{
  margin:0 0 14px;font-family:var(--font-mono);font-size:11.5px;
  letter-spacing:.24em;text-transform:uppercase;color:rgba(234,215,166,.66);
}
.footer__note{font-size:12.8px;line-height:1.7;color:rgba(251,248,241,.58)}
.footer__columns{
  position:relative;z-index:1;
  display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));
  gap:clamp(20px,3vw,40px);
  padding-block:clamp(26px,4vw,44px);
}
.footer__col{min-width:0}
.footer__links{display:grid;gap:9px}
.footer__link{
  display:inline-block;font-size:14.5px;color:var(--cream);text-decoration:none;
  transition:color .22s ease,transform .22s ease;
}
.footer__link:hover,.footer__link:focus-visible{color:var(--gold);transform:translateX(3px)}
.footer__bottom{
  position:relative;z-index:1;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 24px;padding-block:18px 26px;
  border-top:1px solid rgba(234,215,166,.18);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  color:rgba(251,248,241,.6);
}
.footer__copy,.footer__icp{margin:0}

/* ============ 断点 ============ */
@media (max-width:980px){
  .split{grid-template-columns:repeat(6,minmax(0,1fr))}
  .split__aside{grid-column:1 / -1}
  .split__main{grid-column:1 / -1}
}
@media (max-width:900px){
  .nav-shell__inner{
    display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
    gap:10px;padding-block:10px;min-height:0;
  }
  .nav-toggle{
    display:inline-flex;align-items:center;gap:10px;
    padding:9px 15px;background:transparent;
    border:1px solid var(--line-strong);color:var(--ink);
    font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;cursor:pointer;
  }
  .primary-nav{
    flex:1 0 100%;order:3;width:100%;
    display:none;justify-self:stretch;
  }
  .site-header[data-open] .primary-nav{display:block}
  .primary-nav__list{
    flex-direction:column;align-items:stretch;gap:0;
    margin-top:6px;border-top:1px solid var(--line);
  }
  .primary-nav__item{border-bottom:1px solid var(--line)}
  .primary-nav__link{display:block;padding:13px 4px;font-size:15.5px}
  .primary-nav__link::after{display:none}
  .primary-nav__link--accent::before{position:static;display:inline-block;margin-right:8px;transform:rotate(45deg);vertical-align:2px}
  .primary-nav__link[aria-current="page"]{color:var(--coral)}
  .nav-shell__cta{grid-column:auto;justify-self:end}
  .footer__top{grid-template-columns:1fr}
}
@media (max-width:600px){
  body{font-size:16px}
  .header-rail__inner{font-size:10.5px;letter-spacing:.14em}
  .brand__line{font-size:10px;letter-spacing:.2em}
  .footer__bottom{flex-direction:column;align-items:flex-start}
  .btn{padding:12px 20px;font-size:14px}
  .nav-shell__cta .btn{padding:8px 14px;font-size:12.5px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .js [data-reveal]{opacity:1 !important;transform:none !important}
  .btn:hover,.chip:hover,.footer__link:hover{transform:none}
}