:root{
  --ink:#0E2A24;
  --ink-2:#17453A;
  --paper:#F7F4EC;
  --paper-2:#F1ECE0;
  --sand:#EDE6D8;
  --amber:#C9A24A;
  --amber-soft:#E3C784;
  --cyan:#9CC6BC;
  --teal:#2E6F62;
  --text-1:#16211D;
  --text-2:#46524D;
  --alert:#A9502F;
  --rule:#D9D2C2;
  --font-display:"Noto Sans SC","PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  --font-body:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",Georgia,serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
html[data-nav-open]{overflow:hidden}
body,h1,h2,h3,h4,p,figure,blockquote,dl,dd,ul,ol,fieldset{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{display:block;max-width:100%}
button{font:inherit;color:inherit}
table{border-collapse:collapse}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:600;line-height:1.3;letter-spacing:.01em;color:var(--text-1)}
body{background:var(--paper);color:var(--text-1);font-family:var(--font-body);font-size:16px;line-height:1.85;-webkit-font-smoothing:antialiased}
a{color:var(--teal);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
a:hover{color:var(--ink)}
:focus-visible{outline:2px solid var(--amber);outline-offset:3px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.container{width:100%;max-width:1180px;margin:0 auto;padding-inline:48px}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.08em;font-size:13px}
.prose{max-width:68ch;color:var(--text-2);font-size:16px;line-height:1.85}
.prose p+p{margin-top:16px}
.prose h2,.prose h3{color:var(--text-1);margin-top:40px;margin-bottom:12px}
.prose h2{font-size:22px}
.prose h3{font-size:18px}
.prose ul{list-style:none;display:grid;gap:8px;margin-top:16px}
.prose ul li{padding-left:16px;position:relative}
.prose ul li::before{content:"";position:absolute;left:0;top:.85em;width:6px;height:1px;background:var(--amber)}
/* ---------- 头部 ---------- */
.site-header{position:sticky;top:0;z-index:60;background:var(--paper);border-top:1px solid var(--ink)}
.skip-link{position:absolute;left:-9999px;top:0;z-index:200;background:var(--ink);color:var(--amber-soft);border:1px solid var(--amber);padding:12px 18px;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;text-decoration:none}
.skip-link:focus{left:12px;top:12px}
.index-strip{background:var(--ink);color:var(--paper)}
.index-strip__inner{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:40px;transition:min-height .2s var(--ease)}
.idx-label{display:inline-flex;align-items:baseline;gap:8px;font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--cyan);line-height:1.6}
.idx-label__num{color:var(--amber)}
.idx-label__sep{color:var(--teal)}
.index-strip__group{display:flex;align-items:center;gap:8px}
.index-btn{display:inline-flex;align-items:center;gap:8px;padding:5px 12px;border:1px solid rgba(156,198,188,.42);border-radius:1px;font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--cyan);text-decoration:none;transition:background .12s linear,color .12s linear,border-color .12s linear}
.index-btn:hover,.index-btn:focus-visible{background:var(--ink-2);color:var(--amber-soft);border-color:var(--amber)}
.index-btn__arrow{color:var(--amber);font-size:12px;line-height:1}
.brand-row__inner{display:flex;align-items:center;justify-content:space-between;gap:24px;padding-block:18px;transition:padding .2s var(--ease)}
.brand{display:inline-flex;align-items:center;gap:12px;text-decoration:none;color:inherit}
.brand__mark{display:grid;grid-template-columns:repeat(2,7px);grid-template-rows:repeat(2,7px);gap:3px;flex:0 0 auto}
.brand__mark span{display:block;background:var(--amber)}
.brand__mark span:nth-child(2){background:var(--cyan)}
.brand__mark span:nth-child(3){background:transparent;border:1px solid var(--amber-soft)}
.brand__text{display:block}
.brand__name{display:block;font-family:var(--font-display);font-size:22px;font-weight:600;letter-spacing:.04em;line-height:1.2;color:var(--text-1)}
.brand__domain{display:block;font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;color:var(--text-2);line-height:1.6;text-transform:lowercase}
.site-nav{display:block}
.nav-list{display:flex;align-items:center;justify-content:flex-end;gap:2px;flex-wrap:wrap}
.nav-item{display:block}
.nav-link{position:relative;display:inline-flex;align-items:baseline;gap:6px;padding:10px 12px;font-family:var(--font-display);font-size:15px;font-weight:500;letter-spacing:.01em;color:var(--text-1);text-decoration:none;transition:color .12s linear}
.nav-link::after{content:"";position:absolute;left:12px;right:12px;bottom:4px;height:2px;background:var(--amber);transform:scaleX(0);transform-origin:left center;transition:transform .2s var(--ease)}
.nav-link:hover,.nav-link:focus-visible{color:var(--teal)}
.nav-link:hover::after,.nav-link:focus-visible::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--ink)}
.nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--teal)}
.nav-link__num{font-family:var(--font-mono);font-size:10px;letter-spacing:.08em;color:var(--teal);font-variant-numeric:tabular-nums}
.nav-toggle{display:none;position:relative;align-items:center;justify-content:center;flex-direction:column;gap:4px;width:46px;height:46px;background:transparent;border:1px solid var(--ink);border-radius:1px;cursor:pointer;color:var(--ink)}
.nav-toggle__bar{display:block;width:18px;height:1.5px;background:currentColor;transition:transform .2s var(--ease),opacity .2s var(--ease)}
.nav-toggle__label{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
.site-header[data-scrolled] .brand-row__inner{padding-block:10px}
.site-header[data-scrolled] .index-strip__inner{min-height:32px}
.bind-line{height:6px;border-top:1px solid var(--ink);background-image:repeating-linear-gradient(90deg,var(--ink-2) 0 1px,transparent 1px 24px);background-size:auto 4px;background-repeat:repeat-x;background-position:0 0}
.progress-rail{height:2px;background:var(--sand)}
.progress-bar{display:block;width:0;height:100%;background:linear-gradient(90deg,var(--teal),var(--amber));transition:width .12s linear}
/* ---------- 页脚 ---------- */
.site-footer{background:var(--ink);color:var(--paper);border-top:1px solid var(--amber)}
.footer-inner{padding-block:56px 20px}
.footer-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;flex-wrap:wrap;padding-bottom:24px;border-bottom:1px solid rgba(156,198,188,.28)}
.footer-brand{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-display);font-size:22px;font-weight:600;letter-spacing:.04em;color:var(--paper);text-decoration:none}
.footer-brand:hover{color:var(--amber-soft)}
.footer-brand__mark{font-family:var(--font-mono);font-size:10px;font-weight:400;letter-spacing:.14em;color:var(--amber);border:1px solid var(--amber);padding:2px 6px;border-radius:1px}
.footer-tagline{max-width:44ch;font-family:var(--font-body);font-size:14px;line-height:1.7;color:#B9C6C0}
.footer-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:40px 32px;padding-top:40px}
.footer-col{min-width:0}
.footer-col__title{font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.14em;color:var(--cyan);margin:0 0 16px;padding-bottom:8px;border-bottom:1px solid rgba(156,198,188,.28)}
.footer-links{display:grid;gap:10px}
.footer-link{display:inline-flex;align-items:center;padding:2px 0 2px 10px;border-left:3px solid var(--cyan);font-family:var(--font-body);font-size:15px;line-height:1.6;color:#E7E2D6;text-decoration:none;transition:color .12s linear,border-color .12s linear}
.footer-link:hover,.footer-link:focus-visible{color:var(--amber-soft);border-left-color:var(--amber)}
.contact-list{display:grid;gap:14px}
.contact-list__item{display:block}
.contact-list__label{display:block;font-family:var(--font-mono);font-size:10px;letter-spacing:.14em;color:var(--cyan);line-height:1.6}
.contact-list__value{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin-top:2px}
.contact-list__text{font-family:var(--font-mono);font-size:13px;letter-spacing:.02em;color:#EDE6D8;line-height:1.7;word-break:break-all}
.copy-btn{flex:0 0 auto;font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;padding:3px 7px;background:transparent;border:1px solid rgba(156,198,188,.45);border-radius:1px;color:var(--cyan);cursor:pointer;transition:color .12s linear,border-color .12s linear,background .12s linear}
.copy-btn:hover,.copy-btn:focus-visible{color:var(--amber-soft);border-color:var(--amber);background:var(--ink-2)}
.copy-btn[data-copied]{color:var(--ink);background:var(--amber-soft);border-color:var(--amber-soft)}
.footer-note{margin-top:16px;padding-left:10px;border-left:1px solid rgba(156,198,188,.4);font-size:13px;line-height:1.7;color:#A8B5AF}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:40px;padding-top:18px;border-top:1px solid rgba(156,198,188,.28)}
.footer-legal,.footer-copy{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;line-height:1.8;color:#A8B5AF}
/* ---------- 通用区块 ---------- */
.section{padding-block:96px}
.section--tight{padding-block:64px}
.section--sand{background:var(--sand)}
.section-head{display:grid;gap:12px;max-width:760px;margin-bottom:40px}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--teal);text-transform:uppercase}
.eyebrow::before{content:"";width:16px;height:1px;background:var(--amber)}
.section-title{font-size:28px}
.section-lede{max-width:64ch;font-size:16px;line-height:1.85;color:var(--text-2)}
.grid{display:grid;gap:24px}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--rail{grid-template-columns:minmax(0,1fr) 260px;gap:40px}
.rail{display:grid;gap:16px;align-content:start}
.note-card{background:var(--sand);border:1px solid var(--rule);border-left:3px solid var(--cyan);padding:16px 18px}
.note-card__label{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--teal);margin-bottom:6px}
.note-card__text{font-size:14px;line-height:1.75;color:var(--text-2)}
.card{position:relative;background:var(--paper);border:1px solid var(--rule);padding:24px}
.card--cut{background:var(--sand);border:0;padding:28px 24px 26px 28px;clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px)}
.card--cut::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--cyan);transition:background .12s linear}
.card--cut:hover::before,.card--cut:focus-within::before{background:var(--amber)}
.card--ink{background:var(--ink);border-color:var(--ink);color:var(--paper)}
.card--ink .card__title{color:var(--paper)}
.card--ink .card__index{color:var(--amber)}
.card--ink .card__text{color:#C4D2CC}
.card__index{display:block;font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--teal);margin-bottom:10px;font-variant-numeric:tabular-nums}
.card__title{font-size:19px;margin-bottom:8px}
.card__text{font-size:15px;line-height:1.75;color:var(--text-2)}
.tag{display:inline-flex;align-items:center;gap:6px;padding:3px 8px;background:var(--cyan);color:var(--ink);border-radius:1px;font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;line-height:1.7}
.tag--amber{background:var(--amber-soft)}
.chip{display:inline-flex;align-items:center;padding:6px 12px;background:var(--paper);border:1px solid var(--rule);border-radius:1px;font-family:var(--font-display);font-size:13px;color:var(--text-2);cursor:pointer;transition:background .12s linear,color .12s linear,border-color .12s linear}
.chip:hover{border-color:var(--teal);color:var(--teal)}
.chip[aria-pressed="true"]{background:var(--cyan);border-color:var(--teal);color:var(--ink);font-weight:600}
/* ---------- 表格 ---------- */
.table-wrap{overflow-x:auto;background:var(--paper);border:1px solid var(--rule)}
.table-basic{width:100%;min-width:520px;border-collapse:collapse;font-size:15px}
.table-basic caption{caption-side:top;text-align:left;padding:12px 16px;font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--teal);border-bottom:1px solid var(--rule)}
.table-basic th{height:44px;padding:12px 16px;background:var(--sand);font-family:var(--font-mono);font-size:12px;font-weight:500;letter-spacing:.08em;color:var(--text-2);text-align:left;border-bottom:1px solid var(--rule);white-space:nowrap}
.table-basic td{padding:11px 16px;border-bottom:1px solid var(--rule);color:var(--text-1);vertical-align:middle}
.table-basic tbody tr:last-child td{border-bottom:0}
.table-basic tbody tr:nth-child(even) td{background:var(--paper-2)}
.table-basic tbody tr:hover td{background:#EAF1EE;transition:background .12s linear}
.table-basic .is-num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em}
.table-basic tr[data-flag] td:first-child{box-shadow:inset 3px 0 0 var(--alert)}
/* ---------- 折叠 ---------- */
.fold{border:1px solid var(--rule);border-bottom:0;background:var(--paper)}
.fold:last-child{border-bottom:1px solid var(--rule)}
.fold__summary{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 18px;cursor:pointer;list-style:none;font-family:var(--font-display);font-size:16px;font-weight:500;color:var(--text-1)}
.fold__summary::-webkit-details-marker{display:none}
.fold__summary::after{content:"+";font-family:var(--font-mono);font-size:14px;color:var(--teal)}
.fold[open] .fold__summary{background:var(--sand)}
.fold[open] .fold__summary::after{content:"−"}
.fold__body{padding:16px 18px 20px;border-top:1px solid var(--rule);font-size:15px;line-height:1.8;color:var(--text-2)}
/* ---------- 图片容器 ---------- */
.figure{display:grid;gap:10px}
.figure__media{position:relative;overflow:hidden;aspect-ratio:4/3;background:var(--sand);border:1px solid var(--rule)}
.figure__media img{width:100%;height:100%;object-fit:cover}
.figure__media[data-placeholder]::before{content:"";position:absolute;inset:0;background-image:linear-gradient(var(--rule) 1px,transparent 1px),linear-gradient(90deg,var(--rule) 1px,transparent 1px);background-size:32px 32px;opacity:.8}
.figure__media[data-placeholder]::after{content:attr(data-placeholder);position:absolute;left:16px;bottom:12px;font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--teal)}
.figure__caption{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;line-height:1.7;color:var(--text-2)}
.figure--wide .figure__media{aspect-ratio:16/9}
.figure--square .figure__media{aspect-ratio:1/1}
/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:10px 20px;border:1px solid var(--ink);border-radius:1px;background:transparent;color:var(--ink);font-family:var(--font-display);font-size:15px;font-weight:500;letter-spacing:.02em;text-decoration:none;cursor:pointer;transition:background .12s linear,color .12s linear,border-color .12s linear}
.btn--primary{background:var(--ink);border-color:var(--ink);color:var(--paper)}
.btn--primary:hover,.btn--primary:focus-visible{background:var(--ink-2);border-color:var(--ink-2);color:var(--paper)}
.btn--ghost{border-color:var(--teal);color:var(--teal)}
.btn--ghost:hover,.btn--ghost:focus-visible{background:var(--teal);border-color:var(--teal);color:var(--paper)}
.btn--quiet{border-color:var(--rule);color:var(--text-2)}
.btn--quiet:hover,.btn--quiet:focus-visible{border-color:var(--amber);color:var(--ink)}
/* ---------- 面包屑 ---------- */
.breadcrumb{font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--text-2)}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb__item{display:flex;align-items:center;gap:8px}
.breadcrumb__link{color:var(--teal);text-decoration:none}
.breadcrumb__link:hover{text-decoration:underline}
.breadcrumb__sep{color:var(--amber)}
.breadcrumb__current{color:var(--text-2)}
/* ---------- 框景 ---------- */
.tick-frame{position:relative;background:var(--paper);border:1px solid var(--ink);padding:24px}
.tick-frame::before,.tick-frame::after{content:"";position:absolute;width:16px;height:16px;pointer-events:none}
.tick-frame::before{top:-1px;left:-1px;border-top:2px solid var(--amber);border-left:2px solid var(--amber)}
.tick-frame::after{right:-1px;bottom:-1px;border-right:2px solid var(--amber);border-bottom:2px solid var(--amber)}
/* ---------- 动效 ---------- */
html[data-js] [data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .28s var(--ease),transform .28s var(--ease);transition-delay:calc(var(--i,0) * 70ms)}
html[data-js] [data-reveal][data-visible]{opacity:1;transform:none}
/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .container{padding-inline:32px}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--rail{grid-template-columns:minmax(0,1fr)}
  .section{padding-block:72px}
}
@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .site-nav{position:fixed;top:0;right:0;bottom:0;left:auto;z-index:70;width:min(88vw,340px);padding:88px 24px 32px;background:var(--ink);border-left:1px solid var(--amber);overflow-y:auto;transform:translateX(100%);transition:transform .28s var(--ease)}
  .site-header[data-open] .site-nav{transform:translateX(0)}
  .site-header[data-open]::after{content:"";position:fixed;inset:0;z-index:65;background:rgba(14,42,36,.55)}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-link{display:flex;width:100%;align-items:baseline;padding:14px 0;border-bottom:1px solid rgba(156,198,188,.18);font-size:17px;color:#E7E2D6}
  .nav-link::after{display:none}
  .nav-link:hover,.nav-link:focus-visible{color:var(--amber-soft)}
  .nav-link[aria-current="page"]{color:var(--amber-soft)}
  .nav-link__num{color:var(--amber)}
  .site-header[data-open] .nav-toggle{color:var(--amber-soft);border-color:var(--amber)}
  .site-header[data-open] .nav-toggle__bar:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
  .site-header[data-open] .nav-toggle__bar:nth-child(2){opacity:0}
  .site-header[data-open] .nav-toggle__bar:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--2{grid-template-columns:minmax(0,1fr)}
  .section{padding-block:64px}
  .section--tight{padding-block:48px}
}
@media (max-width:640px){
  .container{padding-inline:20px}
  .index-strip__inner{min-height:38px}
  .brand__name{font-size:20px}
  .brand__domain{font-size:9px;letter-spacing:.12em}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:32px}
  .footer-head{align-items:flex-start}
  .footer-inner{padding-block:44px 20px}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
  .grid--3{grid-template-columns:minmax(0,1fr)}
  .section{padding-block:56px}
  .section-title{font-size:24px}
}
@media (max-width:560px){
  .idx-label{display:none}
  .index-strip__group{width:100%;justify-content:space-between}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  html[data-js] [data-reveal]{opacity:1;transform:none;transition:none}
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
}