/* ============================================================
   华体官网 · 共享样式 /assets/site.css
   01 reset / 02 变量 / 03 中文排版 / 04 工具 / 05 刊头
   06 侧轨 / 07 页脚 / 08 基础组件 / 09 响应式 / 10 无障碍
   ============================================================ */

/* ---------- 01 reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,figcaption,dl,dd,blockquote{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video,canvas{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
hr{border:0;border-top:1px solid #2A3F5C;margin:0}

/* ---------- 02 变量 ---------- */
:root{
  --ink:#0B1E33;
  --ink-deep:#071426;
  --panel:#14294A;
  --orange:#FF6B35;
  --cyan:#00E5FF;
  --blue:#4FA8FF;
  --text:#E0E4E8;
  --muted:#9AA9B8;
  --white:#F7FAFC;
  --line:#2A3F5C;
  --orange-soft:#FFD9C9;

  --rail:88px;
  --wrap:1240px;
  --pad:clamp(16px,4vw,48px);

  --font-cn:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --hair:1px solid var(--line);
  --shadow:0 1px 0 rgba(255,255,255,.03),0 18px 34px -26px rgba(0,0,0,.85);
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 03 基础与中文排版 ---------- */
body{
  min-height:100vh;
  background:var(--ink);
  color:var(--text);
  font-family:var(--font-cn);
  font-size:15px;
  line-height:1.9;
  letter-spacing:.012em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3{color:var(--white);font-weight:900;line-height:1.15;letter-spacing:-.006em}
h4,h5,h6{color:var(--white);font-weight:700;line-height:1.3}
strong,b{font-weight:700;color:var(--white)}
small{font-size:13px}
::selection{background:var(--orange);color:var(--ink-deep)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}

@media (min-width:1100px){body{padding-left:var(--rail)}}

/* ---------- 04 工具 ---------- */
.wrap{width:min(100% - calc(var(--pad) * 2),var(--wrap));margin-inline:auto}
.wrap--narrow{width:min(100% - calc(var(--pad) * 2),860px);margin-inline:auto}
.mono{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.08em}
.muted{color:var(--muted)}
.hairline{height:1px;border:0;background:var(--line)}

/* ---------- 05 刊头 ---------- */
.skip-link{
  position:fixed;top:-120px;left:12px;z-index:300;
  padding:10px 18px;background:var(--cyan);color:var(--ink-deep);
  font-size:13px;font-weight:700;letter-spacing:.08em;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:12px}

.masthead{position:relative;z-index:60;background:var(--ink);border-bottom:var(--hair)}

.masthead__bar{background:var(--ink-deep);border-bottom:var(--hair)}
.masthead__inner{
  width:min(100% - calc(var(--pad) * 2),var(--wrap));
  margin-inline:auto;
  display:flex;align-items:center;justify-content:space-between;
  gap:16px;min-height:40px;padding-block:7px;
}
.masthead__tagline{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.3em;
  color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.masthead__actions{display:flex;align-items:center;justify-content:flex-end;gap:clamp(12px,2vw,26px);flex-wrap:wrap}

.utilnav__list{display:flex;align-items:center;gap:clamp(12px,1.8vw,22px)}
.utilnav__link{
  font-size:13px;letter-spacing:.06em;color:var(--muted);
  padding-block:2px;border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.utilnav__link:hover{color:var(--white);border-bottom-color:var(--cyan)}
.utilnav__link[aria-current="page"]{color:var(--cyan);border-bottom-color:var(--cyan)}

.masthead__brandrow{
  position:relative;
  width:min(100% - calc(var(--pad) * 2),var(--wrap));
  margin-inline:auto;
  display:flex;align-items:center;justify-content:center;
  gap:clamp(16px,3vw,40px);
  padding-block:clamp(16px,2.6vw,30px) clamp(14px,2vw,22px);
}
.masthead__brandrow::before,
.masthead__brandrow::after{content:"";flex:1 1 auto;height:1px;min-width:24px;align-self:center}
.masthead__brandrow::before{background:linear-gradient(90deg,rgba(42,63,92,0),var(--line))}
.masthead__brandrow::after{background:linear-gradient(270deg,rgba(42,63,92,0),var(--line))}

.brand{display:inline-flex;align-items:flex-start;gap:6px;color:var(--white)}
.brand__name{
  font-size:clamp(34px,6.2vw,60px);font-weight:900;line-height:1;
  letter-spacing:.16em;padding-left:.16em;color:var(--white);
}
.brand__note{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;line-height:1;
  color:var(--orange);border:1px solid var(--line);padding:4px 4px 4px 7px;margin-top:6px;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.brand:hover .brand__note{color:var(--cyan);border-color:var(--cyan)}
.brand--foot .brand__name{font-size:26px;letter-spacing:.2em;padding-left:.2em}
.brand--foot .brand__note{margin-top:2px}

.navtoggle{
  display:none;position:absolute;right:0;top:50%;transform:translateY(-50%);
  align-items:center;gap:10px;padding:8px 12px;
  border:var(--hair);background:var(--ink-deep);color:var(--white);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.navtoggle:hover{color:var(--cyan);border-color:var(--cyan)}
.navtoggle__box{position:relative;display:block;width:18px;height:12px}
.navtoggle__bar{
  position:absolute;left:0;width:100%;height:1.5px;background:currentColor;
  transition:transform .24s var(--ease);
}
.navtoggle__bar:nth-child(1){top:0}
.navtoggle__bar:nth-child(2){bottom:0}
.navtoggle__text{line-height:1}
.masthead[data-open] .navtoggle__bar:nth-child(1){transform:translateY(5.25px) rotate(45deg)}
.masthead[data-open] .navtoggle__bar:nth-child(2){transform:translateY(-5.25px) rotate(-45deg)}

.navbar{background:var(--ink-deep);border-top:var(--hair);border-bottom:var(--hair)}
.navbar__list{
  width:min(100% - calc(var(--pad) * 2),var(--wrap));
  margin-inline:auto;
  display:flex;align-items:stretch;justify-content:center;
}
.navbar__item{display:flex}
.navbar__item + .navbar__item{border-left:var(--hair)}
.navbar__link{
  position:relative;display:flex;align-items:baseline;gap:8px;
  padding:15px clamp(10px,1.5vw,24px);
  font-size:15px;font-weight:700;letter-spacing:.08em;color:var(--text);
  transition:color .18s var(--ease),background-color .18s var(--ease);
}
.navbar__index{
  font-family:var(--font-mono);font-size:11px;font-weight:400;letter-spacing:.08em;
  color:var(--muted);transition:color .18s var(--ease);
}
.navbar__label{line-height:1.4}
.navbar__link::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:var(--orange);transform:scaleX(0);transform-origin:left center;
  transition:transform .24s var(--ease);
}
.navbar__link:hover{color:var(--white);background:rgba(255,107,53,.08)}
.navbar__link:hover .navbar__index{color:var(--orange)}
.navbar__link:hover::after{transform:scaleX(1)}
.navbar__link[aria-current="page"]{color:var(--white)}
.navbar__link[aria-current="page"] .navbar__index{color:var(--cyan)}
.navbar__link[aria-current="page"]::after{background:var(--cyan);transform:scaleX(1)}

/* ---------- 06 侧轨 ---------- */
.rail{display:none}
.rail__mark{
  writing-mode:vertical-rl;font-size:15px;font-weight:900;
  letter-spacing:.42em;color:var(--white);
}
.rail__line{flex:1 1 auto;width:1px;min-height:24px;
  background:linear-gradient(180deg,var(--line),rgba(42,63,92,0));}
.rail__text{
  writing-mode:vertical-rl;font-size:11px;letter-spacing:.3em;color:var(--muted);
}
.rail__coord{
  writing-mode:vertical-rl;font-family:var(--font-mono);
  font-size:11px;letter-spacing:.2em;color:var(--cyan);
}
.rail__track{position:relative;flex:0 0 auto;width:1px;height:88px;background:var(--line)}
.rail__progress{
  position:absolute;left:0;top:0;width:100%;height:0;
  background:linear-gradient(180deg,var(--cyan),var(--orange));
}

@media (min-width:1100px){
  .rail{
    display:flex;position:fixed;left:0;top:0;bottom:0;width:var(--rail);
    z-index:90;flex-direction:column;align-items:center;gap:12px;
    padding-block:20px;background:var(--ink-deep);border-right:var(--hair);
  }
}

/* ---------- 07 页脚 ---------- */
.sitefoot{
  position:relative;margin-top:clamp(48px,7vw,96px);
  background:var(--ink-deep);border-top:var(--hair);
  padding-block:clamp(34px,4.5vw,60px) 22px;
}
.sitefoot::before{
  content:"";position:absolute;top:-1px;left:0;width:clamp(80px,26%,320px);
  height:1px;background:var(--orange);
}
.sitefoot__inner{width:min(100% - calc(var(--pad) * 2),var(--wrap));margin-inline:auto}
.sitefoot__top{
  display:grid;grid-template-columns:minmax(230px,1.1fr) 2.6fr;
  gap:clamp(24px,4vw,60px);
  padding-bottom:clamp(24px,3.5vw,42px);border-bottom:var(--hair);
}
.sitefoot__brand{display:flex;flex-direction:column;align-items:flex-start;gap:8px}
.sitefoot__note{margin-top:8px;max-width:36ch;font-size:13px;line-height:1.85;color:var(--muted)}

.footnav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(18px,3vw,40px)}
.footnav__col{min-width:0}
.footnav__title{
  margin-bottom:12px;padding-bottom:10px;border-bottom:var(--hair);
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.28em;color:var(--white);
}
.footnav__list{display:grid;gap:9px}
.footnav__link{
  display:inline-flex;align-items:center;gap:8px;font-size:14px;color:var(--text);
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footnav__link::before{
  content:"";display:block;width:6px;height:1px;background:var(--line);
  transition:width .2s var(--ease),background-color .2s var(--ease);
}
.footnav__link:hover{color:var(--white)}
.footnav__link:hover::before{width:14px;background:var(--orange)}
.footnav__link[aria-current="page"]{color:var(--cyan)}
.footnav__list--plain{gap:10px}
.footnav__list--plain li{font-size:13px;line-height:1.8;color:var(--muted);word-break:break-word}
@media (min-width:901px){
  .footnav__col--contact{border-left:var(--hair);padding-left:clamp(16px,2vw,28px)}
}

.sitefoot__base{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 26px;padding-top:20px;
}
.sitefoot__legal,.sitefoot__copy{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;color:var(--muted);
}

/* ---------- 08 基础组件 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;font-size:14px;font-weight:700;letter-spacing:.1em;line-height:1.2;
  border:1px solid var(--orange);color:var(--orange-soft);
  background:linear-gradient(180deg,rgba(255,107,53,.18),rgba(255,107,53,.05));
  transition:background-color .2s var(--ease),color .2s var(--ease),
             border-color .2s var(--ease),transform .15s var(--ease);
}
.btn:hover{background:var(--orange);color:#1B0A03;border-color:var(--orange)}
.btn:active{transform:translateY(1px)}
.btn--ghost{border-color:var(--line);background:transparent;color:var(--text)}
.btn--ghost:hover{border-color:var(--cyan);background:rgba(0,229,255,.1);color:var(--cyan)}
.btn--cyan{
  border-color:var(--cyan);color:var(--cyan);
  background:linear-gradient(180deg,rgba(0,229,255,.16),rgba(0,229,255,.04));
}
.btn--cyan:hover{background:var(--cyan);color:var(--ink-deep);border-color:var(--cyan)}
.btn--sm{padding:7px 14px;font-size:12.5px;letter-spacing:.08em}

.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;color:var(--muted);
}
.crumbs__link{
  color:var(--muted);border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.crumbs__link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.crumbs__sep{color:var(--line)}
.crumbs__here{color:var(--text)}

.prose{max-width:70ch;font-size:15px;line-height:1.9;color:var(--text)}
.prose > * + *{margin-top:1.1em}
.prose h2{font-size:clamp(22px,2.6vw,28px);margin-top:1.9em}
.prose h3{font-size:19px;margin-top:1.6em}
.prose a{color:var(--white);border-bottom:1px solid var(--line)}
.prose a:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.prose ul,.prose ol{padding-left:0}
.prose li{position:relative;padding-left:1.2em}
.prose li + li{margin-top:.4em}
.prose li::before{content:"—";position:absolute;left:0;color:var(--orange)}
.prose code,.prose pre{font-family:var(--font-mono);font-size:13px}
.prose code{background:var(--panel);border:var(--hair);padding:2px 6px;color:var(--cyan)}
.prose pre{background:var(--panel);border:var(--hair);padding:16px;overflow-x:auto;color:var(--text)}
.prose pre code{background:none;border:0;padding:0}
.prose blockquote{border-left:2px solid var(--orange);padding-left:16px;color:var(--muted)}

.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.grid--rail{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}

.sec-head{
  display:grid;grid-template-columns:auto minmax(0,1fr);
  gap:clamp(12px,2vw,26px);align-items:start;
  margin-bottom:clamp(20px,3vw,34px);
}
.sec-head__side{display:flex;flex-direction:column;align-items:center;gap:10px;padding-top:4px}
.sec-head__num{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--orange)}
.sec-head__note{writing-mode:vertical-rl;font-size:11px;letter-spacing:.3em;color:var(--muted)}
.sec-head__tick{width:1px;flex:1 1 auto;min-height:28px;background:var(--line)}
.sec-head__title{font-size:clamp(30px,4.2vw,44px);color:var(--white)}
.sec-head__lead{margin-top:10px;max-width:64ch;font-size:14.5px;color:var(--muted)}

.panel{
  background:var(--panel);border:var(--hair);padding:clamp(16px,2.2vw,26px);
  box-shadow:var(--shadow);transition:border-color .2s var(--ease);
}
.panel:hover{border-color:var(--cyan)}

.tag{
  display:inline-flex;align-items:center;gap:6px;padding:3px 8px;line-height:1;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  color:var(--orange);border:1px solid currentColor;background:rgba(255,107,53,.08);
}
.tag--cyan{color:var(--cyan);background:rgba(0,229,255,.08)}
.tag--blue{color:var(--blue);background:rgba(79,168,255,.08)}
.tag--muted{color:var(--muted);background:transparent;border-color:var(--line)}

.vcode{
  display:inline-flex;align-items:center;gap:8px;padding:4px 10px;
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.08em;color:var(--cyan);
  border:var(--hair);background:rgba(0,229,255,.06);
  transition:border-color .2s var(--ease),background-color .2s var(--ease);
}
.vcode:hover{border-color:var(--cyan);background:rgba(0,229,255,.14)}

.media{
  position:relative;overflow:hidden;border:var(--hair);aspect-ratio:16/9;
  background:
    linear-gradient(135deg,rgba(79,168,255,.16),rgba(0,229,255,.05) 45%,rgba(255,107,53,.12)),
    var(--panel);
  box-shadow:var(--shadow);
}
.media--wide{aspect-ratio:21/9}
.media--square{aspect-ratio:1/1}
.media--portrait{aspect-ratio:4/5}
.media > img,.media > svg,.media > video{width:100%;height:100%;object-fit:cover}
.media__grid{
  position:absolute;inset:0;pointer-events:none;opacity:.4;
  background-image:
    linear-gradient(var(--line) 1px,transparent 1px),
    linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:44px 44px;
}
.media__cap{
  position:absolute;left:0;right:0;bottom:0;padding:10px 14px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--muted);
  background:linear-gradient(180deg,rgba(7,20,38,0),rgba(7,20,38,.92));
}
.media__tag{position:absolute;left:12px;top:12px}

/* 进入视口的显现（仅在有 JS 时启用初始隐藏态） */
.has-js [data-reveal]{opacity:0;transform:translateY(14px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);}
.has-js [data-reveal].is-revealed{opacity:1;transform:none}

/* ---------- 09 响应式 ---------- */
@media (max-width:900px){
  .navtoggle{display:inline-flex;z-index:90}
  .masthead__brandrow{padding-block:16px 14px}
  .masthead__brandrow::before,.masthead__brandrow::after{display:none}

  .navbar{
    position:fixed;top:0;right:0;bottom:0;left:auto;width:min(86vw,340px);
    z-index:85;background:var(--ink-deep);
    border-top:0;border-bottom:0;border-left:var(--hair);
    padding:72px 0 32px;overflow-y:auto;
    transform:translateX(101%);transition:transform .28s var(--ease);
    box-shadow:-24px 0 60px -30px rgba(0,0,0,.9);
  }
  .masthead[data-open] .navbar{transform:none}
  .navbar__list{display:block;width:100%;padding-inline:var(--pad)}
  .navbar__item{display:block;border-left:0;border-bottom:var(--hair)}
  .navbar__item:first-child{border-top:var(--hair)}
  .navbar__link{width:100%;padding:16px 2px;font-size:17px}
  .navbar__link::after{display:none}
  .navbar__link[aria-current="page"]{padding-left:10px;background:rgba(0,229,255,.06)}

  .sitefoot__top{grid-template-columns:1fr}
  .footnav{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footnav__col--contact{border-left:0;padding-left:0}
}

@media (max-width:620px){
  .masthead__inner{flex-direction:column;align-items:flex-start;gap:8px;padding-block:10px}
  .masthead__tagline{display:none}
  .masthead__actions{width:100%;justify-content:space-between}
  .brand__name{font-size:34px}
  .footnav{grid-template-columns:1fr}
  .sitefoot__base{flex-direction:column;align-items:flex-start}
  .sec-head{grid-template-columns:1fr;gap:10px}
  .sec-head__side{flex-direction:row;align-items:center}
  .sec-head__note{writing-mode:horizontal-tb}
  .sec-head__tick{width:34px;height:1px;min-height:0}
}

/* ---------- 10 无障碍与动效降级 ---------- */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html{scroll-behavior:auto !important}
  .has-js [data-reveal]{opacity:1;transform:none}
}