/* ============ 01 变量与重置 ============ */
:root{
  --ink:#0C0E12;
  --ink-2:#383E47;
  --navy:#0A1730;
  --paper:#F7F5F0;
  --paper-2:#EDE9E0;
  --rule:#CFC7B8;
  --blue:#1543E6;
  --blue-soft:#DCE4FF;
  --orange:#FF6A2B;
  --teal:#12A08C;
  --gray:#6B7280;
  --rail:88px;
  --rail-open:272px;
  --header-h:62px;
  --gutter:clamp(18px,3.6vw,40px);
  --maxw:1920px;
  --line:rgba(247,245,240,.16);
  --line-2:rgba(247,245,240,.34);
  --sans:"Inter","Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",Georgia,serif;
  --mono:"IBM Plex Mono","Space Grotesk","SFMono-Regular",Consolas,"Liberation Mono",monospace;
  --ease:cubic-bezier(.2,.7,.2,1);
  --shadow-paper:0 1px 0 rgba(12,14,18,.04),0 10px 24px -18px rgba(10,23,48,.45);
}
*,*::before,*::after{box-sizing:border-box}
html{background:var(--paper);-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;padding:0;
  font-family:var(--sans);font-size:16.5px;line-height:1.85;font-weight:400;
  color:var(--ink-2);background:transparent;overflow-x:hidden;
}
body::before{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(62vw 42vw at 8% -12%,rgba(21,67,230,.11),transparent 62%),
    radial-gradient(48vw 36vw at 98% 4%,rgba(18,160,140,.09),transparent 60%),
    radial-gradient(44vw 32vw at 68% 112%,rgba(255,106,43,.06),transparent 62%);
}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{color:var(--ink);font-weight:800;line-height:1.18;letter-spacing:-.01em}
[hidden]{display:none !important}
:focus-visible{outline:2px solid var(--blue);outline-offset:2px}
.site-header :focus-visible,.site-footer :focus-visible{outline-color:var(--blue-soft)}
@media (min-width:1024px){body{padding-left:var(--rail)}}
#main-content{position:relative;z-index:1}
#main-content:target{scroll-margin-top:calc(var(--header-h) + 12px)}

/* ============ 02 跳转链接 ============ */
.skip-link{
  position:fixed;left:14px;top:12px;z-index:200;
  transform:translateY(-180%);
  background:var(--ink);color:var(--paper);
  padding:10px 16px;font-size:13px;letter-spacing:.06em;border-radius:2px;
  transition:transform 200ms var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ============ 03 头部与轨道 ============ */
.site-header{
  position:fixed;left:0;top:0;bottom:0;width:var(--rail);
  z-index:90;
  background:var(--navy);color:var(--paper);
  border-right:1px solid var(--line);
  overflow:hidden;
  transition:width 340ms var(--ease);
}
.site-header::after{
  content:"";position:absolute;left:0;top:0;bottom:0;width:6px;pointer-events:none;opacity:.55;
  background-image:repeating-linear-gradient(to bottom,rgba(247,245,240,.34) 0 1px,transparent 1px 14px);
}
.rail{
  position:relative;display:flex;flex-direction:column;
  height:100%;padding:16px 0 0;overflow:hidden;
}
.rail__brand{padding:0 18px;display:flex;flex-direction:column;gap:12px}
.brand{display:flex;align-items:center;gap:14px;min-width:0}
.brand__mark{
  position:relative;flex:0 0 44px;width:44px;height:44px;
  display:grid;place-items:center;
  font-family:var(--serif);font-size:19px;font-weight:600;color:var(--paper);
  border:1px solid var(--line-2);
  background:linear-gradient(135deg,rgba(21,67,230,.85),rgba(10,23,48,.35));
}
.brand__mark::after{
  content:"";position:absolute;right:-3px;bottom:-3px;width:10px;height:10px;
  background:var(--blue);box-shadow:0 0 0 2px var(--navy);
}
.brand__text{
  display:flex;flex-direction:column;gap:3px;
  max-width:0;opacity:0;overflow:hidden;white-space:nowrap;
  transition:max-width 340ms var(--ease),opacity 200ms var(--ease);
}
.brand__name{font-size:17px;font-weight:800;letter-spacing:.05em;color:var(--paper);line-height:1.2}
.brand__sub{font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;color:rgba(247,245,240,.55)}
.rail__note{
  max-width:0;opacity:0;overflow:hidden;white-space:nowrap;
  font-size:11px;line-height:1.7;letter-spacing:.06em;color:rgba(247,245,240,.45);
  transition:max-width 340ms var(--ease),opacity 200ms var(--ease);
}
.rail__nav{
  display:flex;flex-direction:column;flex:1 1 auto;min-height:0;
  margin-top:22px;overflow-y:auto;scrollbar-width:none;
}
.rail__nav::-webkit-scrollbar{width:0;height:0}
.rail__label{
  font-family:var(--serif);font-size:11px;letter-spacing:.22em;
  color:rgba(247,245,240,.42);padding:0 20px 8px;
  max-height:0;opacity:0;overflow:hidden;
  transition:max-height 300ms var(--ease),opacity 200ms var(--ease);
}
.nav-list{display:flex;flex-direction:column}
.nav-link{
  position:relative;display:flex;align-items:baseline;gap:14px;
  padding:12px 20px;color:rgba(247,245,240,.72);
  font-size:13.5px;letter-spacing:.06em;
  transition:color 200ms var(--ease),background 200ms var(--ease),transform 200ms var(--ease);
}
.nav-link:hover{color:var(--paper);background:rgba(247,245,240,.07);transform:translate(-1px,-2px)}
.nav-link[aria-current="page"]{
  color:var(--paper);
  background:linear-gradient(90deg,rgba(21,67,230,.62),rgba(21,67,230,0));
}
.nav-link[aria-current="page"]::before{
  content:"";position:absolute;left:0;top:12%;bottom:12%;width:2px;background:var(--blue-soft);
}
.nav-link[aria-current="page"] .nav-link__idx{color:var(--blue-soft)}
.nav-link__idx{
  font-family:var(--mono);font-size:10.5px;font-weight:600;letter-spacing:.08em;
  color:rgba(247,245,240,.38);flex:0 0 auto;
}
.nav-link__label{display:inline-block}
.rail__foot{
  margin-top:auto;padding:16px 0 22px;display:flex;flex-direction:column;gap:12px;
  border-top:1px solid var(--line);
}
.rail__utility{
  color:rgba(247,245,240,.62);font-size:12px;letter-spacing:.12em;
  padding:10px 18px;transition:color 200ms var(--ease),background 200ms var(--ease);
}
.rail__utility:hover{color:var(--paper);background:rgba(247,245,240,.07)}
.rail__actions{display:flex;flex-direction:column;gap:10px}

/* 移动端开关 */
.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:9px 12px;background:transparent;border:1px solid var(--line-2);
  color:var(--paper);font-size:12px;letter-spacing:.1em;cursor:pointer;border-radius:2px;
}
.nav-toggle__bars{display:flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle__bars span{display:block;height:1.5px;background:var(--paper);transition:transform 220ms var(--ease),opacity 160ms linear}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child{transform:translateY(2.75px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child{transform:translateY(-2.75px) rotate(-45deg)}

/* 滚动进度 */
.rail-progress{
  position:absolute;left:0;top:0;bottom:0;width:2px;
  background:rgba(247,245,240,.09);overflow:hidden;pointer-events:none;
}
.rail-progress__bar{
  display:block;width:100%;height:100%;
  background:linear-gradient(180deg,var(--blue),var(--blue-soft));
  transform:scaleY(var(--p,0));transform-origin:top center;
  transition:transform 120ms linear;
}

/* 桌面展开态 */
@media (min-width:1024px){
  .site-header:hover,.site-header:focus-within{width:var(--rail-open)}
  .site-header:hover .brand__text,.site-header:focus-within .brand__text{max-width:180px;opacity:1}
  .site-header:hover .rail__note,.site-header:focus-within .rail__note{max-width:210px;opacity:1}
  .site-header:hover .rail__label,.site-header:focus-within .rail__label{max-height:26px;opacity:1}
  .nav-link{flex-direction:column;align-items:center;gap:6px;padding:9px 4px;font-size:12px}
  .nav-link__label{writing-mode:vertical-rl;letter-spacing:.18em;line-height:1}
  .site-header:hover .nav-link,.site-header:focus-within .nav-link{
    flex-direction:row;align-items:baseline;gap:12px;padding:11px 20px;
  }
  .site-header:hover .nav-link__label,.site-header:focus-within .nav-link__label{
    writing-mode:horizontal-tb;letter-spacing:.06em;font-size:13.5px;
  }
  .rail__utility{padding:10px 20px}
  .rail__actions{display:none}
  .site-header:hover .rail__actions,.site-header:focus-within .rail__actions{display:flex;padding:0 16px}
}
@media (min-width:1024px) and (max-height:840px){
  .nav-link{padding:7px 4px;gap:4px}
  .nav-link__label{font-size:11px;letter-spacing:.14em}
  .rail{margin-top:0}
}

/* ============ 04 移动端头部与抽屉 ============ */
@media (max-width:1023px){
  .site-header{
    position:sticky;top:0;left:auto;right:auto;bottom:auto;width:100%;height:var(--header-h);
    border-right:0;border-bottom:1px solid var(--line);
  }
  .site-header::after{display:none}
  .rail{flex-direction:row;align-items:center;gap:12px;height:100%;padding:0 14px;overflow:visible}
  .rail__brand{padding:0;flex:1 1 auto;min-width:0}
  .brand__mark{flex:0 0 36px;width:36px;height:36px;font-size:16px}
  .brand__text{max-width:none;opacity:1}
  .brand__name{font-size:15px}
  .brand__sub{font-size:10px}
  .rail__note{display:none}
  .nav-toggle{display:inline-flex;flex:0 0 auto}
  .rail__nav{
    position:fixed;left:0;right:0;top:var(--header-h);bottom:0;
    margin:0;padding:22px 18px 44px;background:var(--navy);
    border-top:1px solid var(--line);overflow-y:auto;
    opacity:0;visibility:hidden;transform:translateY(-10px);pointer-events:none;
    transition:opacity 220ms var(--ease),transform 220ms var(--ease),visibility 0ms linear 220ms;
  }
  .rail__nav[data-open]{
    opacity:1;visibility:visible;transform:translateY(0);pointer-events:auto;
    transition-delay:0ms;
  }
  .rail__label{
    max-height:none;opacity:1;overflow:visible;
    padding:0 0 10px;font-size:12px;letter-spacing:.22em;
  }
  .nav-link{padding:14px 4px;border-bottom:1px solid var(--line);font-size:15px;gap:16px}
  .nav-link__idx{font-size:11px}
  .rail__foot{margin-top:26px;border-top:0;padding:0;gap:16px;flex-direction:column-reverse}
  .rail__utility{writing-mode:horizontal-tb;padding:0}
  .rail__actions{display:flex;flex-direction:column;gap:10px}
  .rail__actions .btn{padding:13px 18px;font-size:13px}
  .rail-progress{
    left:0;right:0;top:auto;bottom:0;width:auto;height:2px;
  }
  .rail-progress__bar{
    height:100%;width:100%;background:linear-gradient(90deg,var(--blue),var(--teal));
    transform:scaleX(var(--p,0));transform-origin:left center;
  }
  body.nav-open{overflow:hidden}
}
@media (min-width:640px) and (max-width:1023px){
  .rail__nav{right:auto;width:400px;border-right:1px solid var(--line)}
}

/* ============ 05 通用按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 18px;border:1px solid transparent;border-radius:2px;
  font-size:12.5px;font-weight:600;letter-spacing:.08em;line-height:1.2;
  cursor:pointer;text-align:center;background:transparent;
  transition:transform 200ms var(--ease),background 200ms var(--ease),color 200ms var(--ease),border-color 200ms var(--ease);
}
.btn:hover{transform:translate(-1px,-2px)}
.btn--primary{background:var(--blue);color:#fff;border-color:var(--blue)}
.btn--primary:hover{background:#0f36c4;border-color:#0f36c4}
.btn--ghost{color:var(--paper);border-color:var(--line-2)}
.btn--ghost:hover{border-color:var(--paper);background:rgba(247,245,240,.08)}
.btn--line{color:var(--ink);border-color:var(--rule);background:transparent}
.btn--line:hover{border-color:var(--ink);background:var(--paper-2)}

/* ============ 06 页脚 ============ */
.site-footer{
  position:relative;z-index:1;margin-top:clamp(48px,7vw,104px);
  background:var(--navy);color:var(--paper);
  padding:clamp(40px,5vw,74px) 0 26px;
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:6px;opacity:.5;
  background-image:repeating-linear-gradient(to right,rgba(247,245,240,.4) 0 1px,transparent 1px 16px);
}
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 var(--gutter)}
.footer__inner{position:relative}
.footer__grid{display:grid;grid-template-columns:1fr;gap:34px}
.footer__mark{
  position:relative;display:grid;place-items:center;width:42px;height:42px;
  font-family:var(--serif);font-size:18px;font-weight:600;color:var(--paper);
  border:1px solid var(--line-2);
  background:linear-gradient(135deg,rgba(21,67,230,.85),rgba(10,23,48,.35));
}
.footer__mark::after{
  content:"";position:absolute;right:-3px;bottom:-3px;width:9px;height:9px;
  background:var(--teal);box-shadow:0 0 0 2px var(--navy);
}
.footer__name{font-size:18px;font-weight:800;letter-spacing:.05em;color:var(--paper);margin-top:14px}
.footer__summary{font-size:14px;line-height:1.9;color:rgba(247,245,240,.68);margin-top:10px;max-width:42ch}
.footer__meta{
  font-family:var(--mono);font-size:11px;letter-spacing:.12em;
  color:var(--teal);margin-top:14px;
}
.footer-col{min-width:0}
.footer-col__title{
  font-family:var(--serif);font-size:12.5px;font-weight:600;letter-spacing:.16em;
  color:rgba(247,245,240,.55);padding-bottom:12px;margin-bottom:14px;
  border-bottom:1px solid var(--line);
}
.footer-list{display:flex;flex-direction:column;gap:10px;font-size:14px}
.footer-list a{color:rgba(247,245,240,.82);transition:color 180ms var(--ease)}
.footer-list a:hover{color:#fff;text-decoration:underline;text-decoration-color:var(--blue-soft);text-underline-offset:4px}
.footer-list--contact{gap:14px}
.footer-contact__row{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px}
.footer-contact__key{
  font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;
  color:rgba(247,245,240,.45);flex:0 0 auto;
}
.footer-contact__val{font-family:var(--mono);font-size:13px;color:var(--paper);word-break:break-all}
.footer-contact__val--wide{font-family:var(--sans);font-size:13.5px;line-height:1.8}
.copy-btn{
  font-family:var(--mono);font-size:11px;letter-spacing:.08em;
  padding:5px 9px;background:transparent;border:1px solid var(--line-2);
  color:var(--paper);cursor:pointer;border-radius:2px;
  transition:transform 200ms var(--ease),background 200ms var(--ease),border-color 200ms var(--ease),color 200ms var(--ease);
}
.copy-btn:hover{transform:translate(-1px,-2px);border-color:var(--paper);background:rgba(247,245,240,.08)}
.copy-btn[data-copied]{border-color:var(--teal);color:#7FE3D4}
.footer-contact__note{font-size:12.5px;line-height:1.85;color:rgba(247,245,240,.55);margin-top:14px;max-width:34ch}
.footer__legal{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 26px;
  margin-top:clamp(32px,4vw,58px);padding-top:18px;
  border-top:1px solid var(--line);
  font-size:12px;color:rgba(247,245,240,.5);
}
.footer__icp{font-family:var(--mono);letter-spacing:.06em;color:rgba(247,245,240,.76)}
.footer__fine{letter-spacing:.02em}
@media (min-width:700px){
  .footer__grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:38px}
}
@media (min-width:1180px){
  .footer__grid{grid-template-columns:1.5fr .85fr .95fr .95fr 1.7fr;gap:44px}
}

/* ============ 07 版式与网格 ============ */
.section{
  position:relative;padding:clamp(44px,6vw,96px) 0;
  border-top:1px solid var(--rule);
}
.section:first-of-type{border-top:0}
.section__head{display:grid;gap:16px;margin-bottom:clamp(24px,3vw,40px)}
.section__index{
  font-family:var(--mono);font-size:12px;font-weight:600;letter-spacing:.16em;color:var(--blue);
}
.eyebrow{
  font-family:var(--serif);font-size:.9rem;font-weight:500;letter-spacing:.16em;
  color:var(--gray);
}
.t-display{
  font-family:var(--sans);font-weight:900;letter-spacing:-.02em;line-height:1.08;
  font-size:clamp(2.25rem,5.2vw,4.5rem);color:var(--ink);
}
.t-serif{font-family:var(--serif);font-weight:600;letter-spacing:.04em;color:var(--ink)}
.t-mono{font-family:var(--mono);font-weight:600;font-variant-numeric:tabular-nums}
.lead{font-size:clamp(1rem,1.4vw,1.15rem);line-height:1.85;color:var(--ink-2);max-width:64ch}
.prose{max-width:68ch;font-size:16.5px;line-height:1.85;color:var(--ink-2)}
.prose h2{font-size:clamp(1.4rem,2.4vw,1.9rem);margin:1.8em 0 .6em}
.prose h3{font-size:1.15rem;margin:1.6em 0 .5em}
.prose p{margin:.9em 0}
.prose ul,.prose ol{margin:1em 0;padding-left:1.2em;list-style:disc}
.prose li{margin:.35em 0}
.prose a{color:var(--blue);text-decoration:underline;text-underline-offset:4px}
.prose strong{color:var(--ink);font-weight:600}
.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(16px,2.4vw,32px)}
.grid--auto{
  display:grid;gap:clamp(16px,2.4vw,28px);
  grid-template-columns:repeat(auto-fit,minmax(min(260px,100%),1fr));
}
@media (max-width:1023px){.grid{grid-template-columns:repeat(6,minmax(0,1fr))}}
@media (max-width:639px){.grid{grid-template-columns:repeat(4,minmax(0,1fr))}}

/* ============ 08 标签 / 数字 / 说明块 ============ */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;border:1px solid var(--rule);border-radius:2px;
  background:var(--paper-2);color:var(--ink-2);
  font-family:var(--mono);font-size:11px;letter-spacing:.08em;line-height:1.4;
  transition:transform 200ms var(--ease);
}
.tag:hover{transform:translate(-1px,-2px)}
.tag--blue{border-color:rgba(21,67,230,.35);background:var(--blue-soft);color:#10309F}
.tag--teal{border-color:rgba(18,160,140,.38);background:rgba(18,160,140,.12);color:#0B6E60}
.tag--orange{border-color:rgba(255,106,43,.42);background:rgba(255,106,43,.13);color:#A93A0C}
.stat{display:grid;gap:2px}
.stat__num{
  font-family:var(--mono);font-weight:600;letter-spacing:-.01em;
  font-size:clamp(1.6rem,3vw,2.4rem);color:var(--orange);line-height:1.1;
}
.stat__unit{font-family:var(--mono);font-size:12px;letter-spacing:.1em;color:var(--gray)}
.stat__label{font-size:13px;color:var(--ink-2)}
.note-block{
  position:relative;display:grid;gap:8px;
  background:var(--paper-2);border:1px solid var(--rule);
  padding:20px 22px;box-shadow:var(--shadow-paper);
}
.note-block::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--blue)}
.note-block--teal::before{background:var(--teal)}
.note-block--orange::before{background:var(--orange)}
.note-block__title{font-family:var(--serif);font-size:13.5px;font-weight:600;letter-spacing:.1em;color:var(--ink)}

/* ============ 09 面包屑与筛选 ============ */
.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding:18px 0;font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;color:var(--gray);
}
.breadcrumbs a{color:var(--gray);transition:color 180ms var(--ease)}
.breadcrumbs a:hover{color:var(--blue)}
.breadcrumbs__sep{color:var(--rule)}
.breadcrumbs__current{color:var(--ink)}
.filter-bar{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding-bottom:4px}
.filter-bar__label{font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--gray)}
.filter-chip{
  appearance:none;background:transparent;border:1px solid var(--rule);border-radius:2px;
  padding:7px 12px;font-size:12px;letter-spacing:.08em;color:var(--ink-2);cursor:pointer;
  transition:transform 200ms var(--ease),background 200ms var(--ease),color 200ms var(--ease),border-color 200ms var(--ease);
}
.filter-chip:hover{transform:translate(-1px,-2px);border-color:var(--ink)}
.filter-chip[aria-pressed="true"]{background:var(--blue);border-color:var(--blue);color:#fff}
.is-enter{animation:filterIn 160ms var(--ease) both}
@keyframes filterIn{from{opacity:0}to{opacity:1}}

/* ============ 10 图片容器 ============ */
.media{
  position:relative;display:block;width:100%;overflow:hidden;
  background:var(--paper-2);border:1px solid var(--rule);
}
.media img{width:100%;height:100%;object-fit:cover;display:block}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--wide{aspect-ratio:21/9}
.media--empty{
  background-image:
    linear-gradient(135deg,rgba(21,67,230,.12),rgba(18,160,140,.08)),
    repeating-linear-gradient(45deg,rgba(12,14,18,.05) 0 1px,transparent 1px 14px);
}
.media__tag{
  position:absolute;left:0;bottom:0;padding:5px 10px;
  background:var(--navy);color:var(--paper);
  font-family:var(--mono);font-size:11px;letter-spacing:.1em;
}
.media__caption{
  margin-top:8px;font-family:var(--mono);font-size:12px;letter-spacing:.04em;color:var(--gray);
}

/* ============ 11 显现动效 ============ */
html.js [data-reveal]{opacity:0;transform:translateY(12px)}
html.js [data-reveal].is-revealed{
  opacity:1;transform:none;
  transition:opacity 260ms var(--ease),transform 260ms var(--ease);
}

/* ============ 12 动效降级 ============ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  html.js [data-reveal]{opacity:1;transform:none}
  .btn:hover,.tag:hover,.copy-btn:hover,.nav-link:hover,.filter-chip:hover{transform:none}
}