/* ==========================================================================
   华体CN · 华体移动站 — 共享站点样式 /assets/site.css
   01 重置  02 变量  03 基础排版  04 布局工具  05 通用组件
   06 站点头部  07 站点页脚  08 响应式  09 动效降级
   ========================================================================== */

/* 01 重置 */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd,fieldset{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video,picture{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
strong,b{font-weight:700}

/* 02 变量 */
:root{
  --navy:#0B2A4A;
  --ink:#071A2F;
  --console:#17456F;
  --orange:#FF6B2C;
  --orange-deep:#E85E22;
  --orange-soft:#FFD7C4;
  --teal:#0F6B5E;
  --doc:#F4F1EA;
  --surface:#FBF8F1;
  --paper:#DED8CC;
  --slate:#44566A;
  --mist:#A9BAC9;

  --rail-w:108px;
  --bar-h:64px;
  --maxw:1280px;
  --radius-sm:12px;
  --radius:18px;
  --radius-lg:24px;
  --radius-pill:999px;

  --font-display:"Barlow Condensed","Archivo Narrow","Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono","SFMono-Regular",Consolas,"Noto Sans Mono","Courier New",monospace;

  --ease:180ms cubic-bezier(.2,.65,.25,1);
  --line:1px solid var(--paper);
}

/* 03 基础排版 */
body{
  background:var(--doc);
  color:var(--slate);
  font-family:var(--font-body);
  font-size:17px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5{
  color:var(--navy);
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.06;
  letter-spacing:-.015em;
  font-stretch:condensed;
  text-wrap:balance;
}
h1{font-size:clamp(40px,6vw,88px)}
h2{font-size:clamp(28px,3.4vw,44px);line-height:1.12}
h3{font-family:var(--font-body);font-size:clamp(20px,2vw,26px);line-height:1.3;font-weight:700;letter-spacing:0}
h4{font-family:var(--font-body);font-size:17px;font-weight:700;line-height:1.45;letter-spacing:0}
p{line-height:1.75}
p + p{margin-top:.85em}
::selection{background:var(--orange);color:var(--ink)}
:focus-visible{outline:3px solid var(--orange);outline-offset:3px;border-radius:6px}
#main-content,:target{scroll-margin-top:calc(var(--bar-h) + 16px)}
.mono{font-family:var(--font-mono);font-size:.8em;letter-spacing:.12em;font-variant-numeric:tabular-nums}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* 04 布局工具 */
.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:clamp(16px,4vw,48px)}
.grid{display:grid;gap:clamp(14px,2vw,24px);grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr))}
.divider{height:1px;background:var(--paper);border:0;margin:clamp(20px,3vw,36px) 0}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;
  color:var(--teal);text-transform:uppercase;
}
.eyebrow::before{content:"";width:18px;height:2px;background:var(--teal);flex:none}
.lede{font-size:clamp(17px,1.4vw,20px);line-height:1.72;color:var(--slate);max-width:44em}
.step-no{
  display:inline-block;font-family:var(--font-mono);font-size:12px;
  letter-spacing:.18em;color:var(--orange);font-variant-numeric:tabular-nums;
}
.section-head{
  display:grid;grid-template-columns:auto 1fr;align-items:baseline;
  gap:2px 16px;padding-bottom:14px;border-bottom:var(--line);
  margin-bottom:clamp(18px,3vw,32px);
}
.section-head__num{font-family:var(--font-mono);font-size:13px;letter-spacing:.16em;color:var(--orange);font-variant-numeric:tabular-nums}
.section-head__title{font-size:clamp(22px,2.6vw,32px);color:var(--navy);font-family:var(--font-display);font-weight:800;letter-spacing:-.01em;line-height:1.15}
.section-head__note{grid-column:1/-1;font-size:14px;color:var(--slate);max-width:52em}

/* 05 通用组件 */
.breadcrumb{display:flex;flex-wrap:wrap;gap:6px 8px;padding:16px 0;font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--slate)}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:var(--mist)}
.breadcrumb__link{color:var(--slate);border-bottom:1px solid transparent;transition:color var(--ease),border-color var(--ease)}
.breadcrumb__link:hover{color:var(--navy);border-bottom-color:var(--orange)}
.breadcrumb__current{color:var(--navy);font-weight:600}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:12px 24px;border-radius:var(--radius-pill);
  font-family:var(--font-body);font-size:15px;font-weight:700;line-height:1.3;
  border:1px solid transparent;
  transition:background var(--ease),color var(--ease),border-color var(--ease),transform var(--ease);
}
.btn--primary{background:var(--orange);color:var(--ink);border-color:var(--orange)}
.btn--primary:hover{background:var(--orange-deep);border-color:var(--orange-deep);color:var(--ink)}
.btn--ghost{background:transparent;color:var(--navy);border-color:var(--navy)}
.btn--ghost:hover{background:var(--navy);color:var(--doc)}
.btn--quiet{background:var(--surface);color:var(--navy);border-color:var(--paper)}
.btn--quiet:hover{border-color:var(--navy);background:#fff}
.btn:active{transform:translateY(1px)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 10px;border-radius:var(--radius-pill);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;line-height:1.6;
  background:var(--paper);color:var(--navy);border:1px solid transparent;
  white-space:nowrap;
}
.tag--teal{background:rgba(15,107,94,.1);color:var(--teal);border-color:rgba(15,107,94,.3)}
.tag--orange{background:var(--orange-soft);color:var(--ink);border-color:rgba(255,107,44,.45)}
.tag--dark{background:var(--navy);color:var(--doc);border-color:var(--navy)}
.tag--ghost{background:transparent;color:var(--slate);border-color:var(--paper)}

.card{
  background:var(--surface);border:var(--line);border-radius:var(--radius-lg);
  padding:clamp(18px,2.4vw,30px);
  transition:border-color var(--ease),background var(--ease);
}
.card:hover{border-color:var(--navy)}
.card h3{margin-bottom:8px}
.panel{
  background:var(--navy);color:var(--doc);
  border-radius:var(--radius-lg);padding:clamp(20px,3vw,40px);
}
.panel h2,.panel h3,.panel h4{color:#fff}
.panel a{color:var(--orange-soft);border-bottom:1px solid rgba(255,215,196,.45)}
.panel a:hover{color:#fff;border-bottom-color:var(--orange)}

.disclosure{
  background:var(--surface);border:var(--line);border-radius:var(--radius);
  overflow:hidden;
}
.disclosure + .disclosure{margin-top:10px}
.disclosure summary{
  display:flex;align-items:center;gap:12px;cursor:pointer;
  padding:14px 18px;font-weight:700;color:var(--navy);
  list-style:none;transition:background var(--ease);
}
.disclosure summary::-webkit-details-marker{display:none}
.disclosure summary::after{
  content:"+";margin-left:auto;font-family:var(--font-mono);
  font-size:18px;line-height:1;color:var(--orange);
}
.disclosure[open] summary::after{content:"–"}
.disclosure[open] summary{background:var(--orange-soft)}
.disclosure__body{padding:14px 18px 20px;font-size:15px;color:var(--slate)}

.doc-table{width:100%;font-size:15px;border:var(--line);border-radius:var(--radius-sm);overflow:hidden}
.doc-table th{
  background:var(--console);color:#fff;text-align:left;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  padding:10px 12px;font-weight:500;
}
.doc-table td{padding:10px 12px;border-bottom:1px solid var(--paper);vertical-align:top}
.doc-table tbody tr:last-child td{border-bottom:0}
.doc-table tbody tr:hover{background:rgba(255,215,196,.35)}

.media{
  position:relative;display:block;overflow:hidden;
  border-radius:var(--radius-lg);
  background:var(--navy);
  border:1px solid rgba(11,42,74,.18);
  width:100%;
}
.media img,.media__img{display:block;width:100%;height:100%;object-fit:cover}
.media--wide{aspect-ratio:16/9}
.media--square{aspect-ratio:1/1}
.media--tall{aspect-ratio:3/4}
.media--band{aspect-ratio:21/9}
.media__ph{
  position:absolute;inset:0;display:grid;place-items:center;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;
  color:rgba(244,241,234,.55);
  background:repeating-linear-gradient(135deg,rgba(255,255,255,.05) 0 10px,transparent 10px 20px);
}
.media__tag{position:absolute;left:12px;top:12px;z-index:2}
.media__caption{
  display:block;margin-top:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;line-height:1.6;
  color:var(--slate);
}

.prose{max-width:40em}
.prose p + p{margin-top:1em}
.prose h3{margin:1.8em 0 .55em}
.prose h4{margin:1.5em 0 .4em}
.prose ul{display:grid;gap:.5em;margin:1em 0}
.prose ul li{position:relative;padding-left:1.1em}
.prose ul li::before{
  content:"";position:absolute;left:0;top:.72em;
  width:6px;height:6px;border-radius:2px;background:var(--teal);
}
.prose strong{color:var(--navy)}

/* 06 站点头部 */
.site-header{position:relative;z-index:60}
.skip-link{
  position:fixed;left:12px;top:-120px;z-index:200;
  padding:10px 20px;border-radius:0 0 var(--radius-sm) var(--radius-sm);
  background:var(--orange);color:var(--ink);font-weight:700;font-size:14px;
  transition:top var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{top:0}
.site-header::before{
  content:"";position:fixed;inset:0;z-index:82;
  background:rgba(7,26,47,.58);
  opacity:0;pointer-events:none;
  transition:opacity 200ms ease;
}
.scroll-progress{
  position:fixed;top:0;left:0;right:0;height:3px;z-index:90;
  pointer-events:none;background:transparent;
}
.scroll-progress__bar{
  display:block;height:100%;width:100%;
  background:var(--orange);
  transform:scaleX(0);transform-origin:0 50%;
}
.topbar{
  position:sticky;top:0;z-index:70;
  display:flex;align-items:center;gap:clamp(12px,2vw,28px);
  min-height:var(--bar-h);
  padding:10px clamp(16px,3vw,40px);
  background:rgba(244,241,234,.95);
  border-bottom:var(--line);
  backdrop-filter:blur(6px);
  -webkit-backdrop-filter:blur(6px);
}
.topbar::after{
  content:"";position:absolute;left:0;bottom:-1px;
  width:104px;height:3px;background:var(--orange);
}
.brand{display:flex;flex-direction:column;gap:1px;line-height:1.15;flex:none}
.brand__mark{
  font-family:var(--font-display);font-weight:800;font-size:21px;
  letter-spacing:.01em;color:var(--navy);
  transition:color var(--ease);
}
.brand__line{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.18em;
  color:var(--slate);transition:color var(--ease);
}
.brand:hover .brand__mark{color:var(--console)}
.brand:hover .brand__line{color:var(--teal)}
.topbar__utility{
  margin-left:auto;font-size:13px;letter-spacing:.04em;
  color:var(--slate);white-space:nowrap;
}
.topbar__meta{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:var(--navy);border:var(--line);border-radius:var(--radius-pill);
  padding:3px 12px;white-space:nowrap;
}
.nav-toggle{
  display:flex;align-items:center;gap:10px;margin-left:auto;
  padding:8px 16px 8px 13px;
  border:1px solid var(--navy);border-radius:var(--radius-pill);
  color:var(--navy);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;
  transition:background var(--ease),color var(--ease),border-color var(--ease);
}
.nav-toggle:hover{background:var(--navy);color:var(--doc);border-color:var(--navy)}
.nav-toggle__bars{display:flex;flex-direction:column;gap:3px;width:16px;flex:none}
.nav-toggle__bars span{
  display:block;height:2px;border-radius:2px;background:currentColor;
  transition:transform 180ms ease,opacity 180ms ease;
}
.nav-toggle__bars span:nth-child(1){width:16px}
.nav-toggle__bars span:nth-child(2){width:11px}
.nav-toggle__bars span:nth-child(3){width:16px}
.site-header[data-open="true"] .nav-toggle{background:var(--navy);color:var(--doc);border-color:var(--navy)}
.site-header[data-open="true"] .nav-toggle__bars span{width:16px}
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

.rail{
  position:fixed;top:0;left:0;bottom:0;width:var(--rail-w);z-index:85;
  display:flex;flex-direction:column;
  padding:20px 0 18px;
  background:var(--navy);
  color:var(--doc);
  border-right:1px solid rgba(169,186,201,.22);
  overflow-y:auto;
  overscroll-behavior:contain;
}
.rail__rule{
  display:block;width:34px;height:3px;border-radius:2px;
  background:var(--orange);margin:4px 0 22px 18px;flex:none;
}
.rail__nav{flex:0 0 auto}
.nav-list{display:flex;flex-direction:column;gap:2px}
.nav-list__item{min-width:0}
.nav-link{
  display:block;padding:8px 14px 8px 15px;
  border-left:3px solid transparent;
  color:var(--mist);
  transition:color var(--ease),background var(--ease),border-color var(--ease);
}
.nav-link__num{
  display:block;font-family:var(--font-mono);font-size:10px;letter-spacing:.14em;
  color:rgba(169,186,201,.72);line-height:1.5;
  transition:color var(--ease);
}
.nav-link__label{display:block;font-size:13px;line-height:1.4;letter-spacing:.02em;margin-top:1px}
.nav-link:hover,.nav-link:focus-visible{
  background:rgba(244,241,234,.1);color:#fff;border-left-color:var(--orange);
}
.nav-link:hover .nav-link__num,.nav-link:focus-visible .nav-link__num{color:var(--orange)}
.nav-link[aria-current="page"]{
  background:rgba(255,107,44,.16);color:#fff;border-left-color:var(--orange);
}
.nav-link[aria-current="page"] .nav-link__num{color:var(--orange)}
.rail__note{
  margin-top:auto;padding:18px 18px 0;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.14em;
  line-height:1.7;color:rgba(244,241,234,.55);
}
.rail__note .mono{color:rgba(244,241,234,.85)}

/* 07 站点页脚 */
.site-footer{
  margin-top:clamp(48px,8vw,96px);
  background:var(--navy);
  color:var(--doc);
  border-radius:28px 28px 0 0;
  overflow:hidden;
}
.footer__top{
  display:grid;gap:clamp(24px,4vw,56px);grid-template-columns:1fr;
  padding-block:clamp(32px,5vw,64px);
}
.footer__brand{min-width:0}
.footer__brand-line{
  font-family:var(--font-display);font-weight:800;
  font-size:clamp(24px,2.6vw,32px);line-height:1.15;
  letter-spacing:-.01em;color:#fff;
}
.footer__summary{margin-top:10px;font-size:15px;line-height:1.7;color:var(--mist);max-width:34em}
.footer__cta{margin-top:22px}
.footer__grid{
  display:grid;gap:clamp(20px,3vw,40px);
  grid-template-columns:repeat(auto-fit,minmax(180px,1fr));
  min-width:0;
}
.footer__col{min-width:0}
.footer__col--contact{min-width:0}
.footer__col-title{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
  color:var(--orange);text-transform:uppercase;
  padding-bottom:10px;margin-bottom:14px;
  border-bottom:1px solid rgba(169,186,201,.25);
}
.footer__list{display:grid;gap:9px}
.footer__link{
  display:inline-block;font-size:15px;color:var(--mist);
  border-bottom:1px solid transparent;
  transition:color var(--ease),border-color var(--ease);
}
.footer__link:hover{color:#fff;border-bottom-color:var(--orange)}
.footer__contact-item{display:grid;gap:2px;min-width:0}
.footer__label{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;
  color:var(--mist);opacity:.85;
}
.footer__value{color:#fff;font-size:14px;line-height:1.6;overflow-wrap:anywhere}
.footer__copy{
  justify-self:start;margin-top:6px;
  padding:3px 12px;border-radius:var(--radius-pill);
  border:1px solid rgba(255,215,196,.45);
  font-family:var(--font-mono);font-size:10px;letter-spacing:.14em;
  color:var(--orange-soft);
  transition:background var(--ease),color var(--ease),border-color var(--ease);
}
.footer__copy:hover{background:rgba(255,215,196,.16);color:#fff}
.footer__copy[data-copied="true"]{background:var(--orange);border-color:var(--orange);color:var(--ink)}
.footer__legal{background:var(--ink);border-top:1px solid rgba(169,186,201,.18)}
.footer__legal-inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:8px 24px;padding-block:18px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;
  line-height:1.7;color:var(--mist);
}
.footer__copyright{margin:0}
.footer__year{color:var(--orange)}
.footer__legal-note{margin:0;color:rgba(169,186,201,.78)}

/* 08 响应式 */
@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
  .nav-toggle{display:none}
  .scroll-progress{left:var(--rail-w)}
  .footer__top{grid-template-columns:minmax(240px,1fr) 2fr;align-items:start}
}
@media (max-width:1199px){
  .topbar__meta{display:none}
}
@media (max-width:899px){
  .topbar__utility{display:none}
  .footer__top{gap:28px}
}
@media (max-width:1023px){
  .rail{
    position:fixed;left:0;right:0;bottom:0;top:auto;width:auto;
    max-height:min(82vh,620px);
    display:block;z-index:85;
    padding:14px 14px calc(16px + env(safe-area-inset-bottom,0px));
    border-right:0;
    border-top:1px solid rgba(169,186,201,.28);
    border-radius:26px 26px 0 0;
    transform:translateY(110%);
    visibility:hidden;
    transition:transform 220ms cubic-bezier(.2,.7,.2,1),visibility 220ms;
  }
  .site-header[data-open="true"] .rail{transform:translateY(0);visibility:visible}
  .site-header[data-open="true"]::before{opacity:1}
  .rail__rule{display:none}
  .nav-list{display:grid;grid-template-columns:1fr 1fr;gap:8px}
  .nav-link{
    padding:12px 14px;
    background:rgba(244,241,234,.07);
    border:1px solid rgba(169,186,201,.16);
    border-radius:14px;
    transition:background var(--ease),border-color var(--ease),color var(--ease);
  }
  .nav-link:hover,.nav-link:focus-visible{background:rgba(244,241,234,.14);border-color:rgba(255,107,44,.55)}
  .nav-link[aria-current="page"]{background:rgba(255,107,44,.18);border-color:var(--orange)}
  .nav-link__num{font-size:11px}
  .nav-link__label{font-size:14px}
  .rail__note{padding:16px 4px 0;margin-top:14px}
}
@media (max-width:559px){
  .nav-list{grid-template-columns:1fr}
  .footer__legal-inner{flex-direction:column;align-items:flex-start}
}

/* 09 动效与降级 */
.has-js [data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity 320ms ease,transform 320ms ease;
}
.has-js [data-reveal][data-revealed="true"]{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  .has-js [data-reveal]{opacity:1;transform:none}
  .rail{transition:none}
}