/* ===== 01 重置与设计变量 ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:120px}
body{
  margin:0;min-height:100vh;
  background-color:var(--void);
  color:var(--mist);
  font-family:var(--font-body);
  font-size:16px;line-height:1.75;font-weight:400;
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}
img,svg,video{display:block;max-width:100%}
h1,h2,h3,h4,h5,h6,p,figure,blockquote{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
:root{
  --void:#05070C;
  --panel:#0D1220;
  --line:#1B2333;
  --violet-mid:#3A2270;
  --violet-glow:#5B37B7;
  --cyan:#22E3FF;
  --orange:#FF6A2B;
  --lime:#B6FF3D;
  --mist:#E8EEF7;
  --muted:#8C97AB;
  --steel:#C7D2E0;
  --font-display:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","DM Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --shell:1200px;
  --gutter:clamp(16px,4vw,44px);
  --ease:cubic-bezier(.2,.7,.2,1);
  --pill:999px;
}
::selection{background:rgba(34,227,255,.28);color:#fff}

/* ===== 02 背景呼吸层：粒子斜纹 + 天山夜色辉光 ===== */
body::before{
  content:"";position:fixed;inset:0;z-index:-2;pointer-events:none;
  background:
    radial-gradient(1100px 620px at 88% -10%,rgba(34,227,255,.15),transparent 62%),
    radial-gradient(900px 700px at 4% 104%,rgba(91,55,183,.32),transparent 66%),
    radial-gradient(560px 400px at 46% 44%,rgba(255,106,43,.07),transparent 72%);
}
body::after{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.55;
  background-image:repeating-linear-gradient(63deg,rgba(199,210,224,.05) 0 1px,transparent 1px 48px);
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.9),rgba(0,0,0,.22) 58%,transparent);
  mask-image:linear-gradient(180deg,rgba(0,0,0,.9),rgba(0,0,0,.22) 58%,transparent);
}

/* ===== 03 中文排版与标题 ===== */
h1,h2,h3,h4,.section-title{
  font-family:var(--font-display);
  font-weight:800;line-height:1.06;letter-spacing:-.02em;color:var(--mist);
}
h1{font-size:clamp(34px,5.6vw,76px)}
h2{font-size:clamp(28px,4vw,48px)}
h3{font-size:clamp(20px,2.4vw,28px);line-height:1.2}
p{max-width:68ch}
strong{font-weight:700;color:#fff}
::marker{color:var(--cyan)}

/* ===== 04 无障碍与焦点 ===== */
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;border-radius:4px}
.visually-hidden{
  position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;
}
.skip-link{
  position:fixed;top:10px;left:50%;z-index:200;
  transform:translate(-50%,-180%);
  padding:11px 20px;border-radius:var(--pill);
  background:var(--cyan);color:#04141A;
  font:700 13px/1 var(--font-body);letter-spacing:.08em;
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translate(-50%,0)}

/* ===== 05 容器与栅格 ===== */
.shell{
  width:100%;max-width:calc(var(--shell) + var(--gutter) * 2);
  margin-inline:auto;padding-inline:var(--gutter);
}
#main-content{padding-top:clamp(104px,13vh,150px)}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(14px,2vw,26px)}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-12{grid-column:span 12}
.hairline{height:1px;border:0;background:var(--line);margin:clamp(24px,4vw,48px) 0}

/* ===== 06 按钮体系 ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  padding:.78em 1.35em;border-radius:var(--pill);
  border:1px solid transparent;
  font:600 13px/1 var(--font-body);letter-spacing:.08em;
  transition:transform .18s var(--ease),background .18s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease),color .18s var(--ease);
}
.btn-ghost{
  color:var(--cyan);border-color:rgba(34,227,255,.55);
  background:rgba(34,227,255,.07);
}
.btn-ghost:hover{background:rgba(34,227,255,.16);border-color:var(--cyan);box-shadow:0 14px 30px -24px rgba(34,227,255,.95)}
.btn-solid{
  color:#12060A;border-color:rgba(255,138,85,.9);
  background:linear-gradient(135deg,#FF8A55,var(--orange));
  box-shadow:0 14px 30px -22px rgba(255,106,43,.95);
}
.btn-solid:hover{transform:translateY(-2px);box-shadow:0 20px 36px -22px rgba(255,106,43,1)}
.btn-quiet{color:var(--steel);border-color:var(--line);background:rgba(13,18,32,.7)}
.btn-quiet:hover{color:var(--mist);border-color:rgba(34,227,255,.45)}

/* ===== 07 悬浮胶囊头部 ===== */
.site-header{
  position:fixed;inset:14px 0 auto 0;z-index:70;
  display:flex;flex-direction:column;align-items:center;gap:8px;
  padding-inline:var(--gutter);pointer-events:none;
}
.site-header>*{pointer-events:auto}
.header-shell{
  position:relative;
  width:100%;max-width:var(--shell);
  display:flex;align-items:center;justify-content:space-between;gap:clamp(10px,2vw,24px);
  padding:10px 12px 10px 16px;
  border:1px solid var(--line);border-radius:var(--pill);
  background:linear-gradient(118deg,rgba(13,18,32,.95),rgba(5,7,12,.9) 56%,rgba(58,34,112,.46));
  box-shadow:inset 0 1px 0 rgba(199,210,224,.07),0 22px 46px -32px #000;
  -webkit-backdrop-filter:blur(14px) saturate(125%);
  backdrop-filter:blur(14px) saturate(125%);
  transition:padding .18s var(--ease),background .18s var(--ease),border-color .18s var(--ease);
}
.site-header[data-shrink="true"] .header-shell{
  padding-block:6px;
  border-color:rgba(34,227,255,.24);
  background:linear-gradient(118deg,rgba(13,18,32,.97),rgba(5,7,12,.95) 62%,rgba(58,34,112,.55));
}

/* 品牌 */
.brand{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto;border-radius:var(--pill);padding:4px 6px 4px 0}
.brand-mark{
  position:relative;width:30px;height:30px;flex:0 0 auto;
  background:linear-gradient(150deg,var(--cyan),var(--violet-glow) 58%,var(--violet-mid));
  clip-path:polygon(0 0,100% 0,100% 70%,70% 100%,0 100%);
  box-shadow:0 0 22px -8px rgba(34,227,255,.85);
}
.brand-mark::after{
  content:"";position:absolute;left:5px;bottom:5px;width:11px;height:2px;
  background:var(--lime);transform:skewX(-24deg);
}
.brand-text{display:flex;flex-direction:column;gap:2px;line-height:1}
.brand-name{font-family:var(--font-display);font-weight:800;font-size:17px;letter-spacing:.08em;color:var(--mist);transition:color .18s var(--ease)}
.brand-sub{
  font-size:10.5px;letter-spacing:.16em;color:var(--muted);
  max-height:16px;overflow:hidden;
  transition:opacity .18s var(--ease),max-height .18s var(--ease),transform .18s var(--ease);
}
.brand:hover .brand-name,.brand:focus-visible .brand-name{color:var(--cyan)}
.site-header[data-shrink="true"] .brand-sub{opacity:0;max-height:0;transform:translateY(-4px)}

/* 导航 */
.site-nav{display:flex;align-items:center;gap:clamp(8px,1.4vw,20px);min-width:0}
.nav-list{display:flex;align-items:center;gap:clamp(1px,.5vw,6px)}
.nav-item{display:block}
.nav-link{
  position:relative;display:inline-block;padding:8px 10px;
  font-size:13.5px;letter-spacing:.05em;color:var(--muted);
  border-radius:var(--pill);
  transition:color .18s var(--ease),background .18s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:10px;right:10px;bottom:4px;height:1px;
  background:linear-gradient(90deg,var(--cyan),var(--violet-glow));
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform .18s var(--ease);
}
.nav-link:hover,.nav-link:focus-visible{color:var(--mist);background:rgba(34,227,255,.08)}
.nav-link:hover::after,.nav-link:focus-visible::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--mist);background:rgba(34,227,255,.06)}
.nav-link[aria-current="page"]::after{
  transform:scaleX(1);
  background:linear-gradient(90deg,var(--cyan),var(--lime));
}
.nav-cta{margin-left:clamp(2px,.8vw,10px);flex:0 0 auto}

/* 移动端开关 */
.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:9px 14px;border-radius:var(--pill);
  border:1px solid rgba(34,227,255,.45);
  background:rgba(34,227,255,.09);color:var(--cyan);
  font:600 12px/1 var(--font-body);letter-spacing:.14em;
  transition:background .18s var(--ease),border-color .18s var(--ease);
}
.nav-toggle:hover{background:rgba(34,227,255,.18);border-color:var(--cyan)}
.nav-toggle-bars{display:inline-flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle-bars span{display:block;height:1.5px;border-radius:2px;background:currentColor;transition:transform .18s var(--ease)}
.nav-toggle[data-open="true"] .nav-toggle-bars span:first-child{transform:translateY(2.75px) rotate(45deg)}
.nav-toggle[data-open="true"] .nav-toggle-bars span:last-child{transform:translateY(-2.75px) rotate(-45deg)}

/* 面包屑槽位与阅读进度 */
.site-crumb{
  width:100%;max-width:var(--shell);
  display:flex;align-items:center;gap:8px;flex-wrap:wrap;
  padding:6px 6px 0;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--muted);
}
.site-crumb[hidden]{display:none}
.crumb-link{color:var(--muted);transition:color .18s var(--ease)}
.crumb-link:hover,.crumb-link:focus-visible{color:var(--cyan)}
.crumb-sep{color:rgba(140,151,171,.6)}
.crumb-current{color:var(--steel)}
.scroll-progress{
  position:fixed;top:0;left:0;right:0;height:2px;z-index:80;pointer-events:none;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--lime) 56%,var(--orange));
  opacity:0;transition:opacity .25s var(--ease);
}
.scroll-progress[data-active="true"]{opacity:.92}

/* ===== 08 页脚 ===== */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(64px,10vw,128px);
  padding-block:clamp(44px,6vw,78px) 0;
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(13,18,32,.94) 0%,#05070C 70%);
}
.site-footer::before{
  content:"";position:absolute;inset:0 0 auto 0;height:1px;
  background:linear-gradient(90deg,transparent,var(--cyan) 12%,var(--violet-glow) 48%,var(--orange) 86%,transparent);
  opacity:.9;
}
.site-footer::after{
  content:"";position:absolute;top:-160px;right:-100px;width:460px;height:460px;
  background:radial-gradient(circle,rgba(91,55,183,.3),transparent 68%);
  pointer-events:none;
}
.footer-shell{position:relative;z-index:1}
.footer-grid{
  display:grid;grid-template-columns:1.5fr 1fr 1fr 1.7fr;
  gap:clamp(24px,3.4vw,52px);
}
.footer-col{min-width:0}
.brand-footer{align-items:flex-start;padding:0}
.brand-footer .brand-name{font-size:20px}
.footer-tagline{margin-top:16px;font-size:14px;line-height:1.8;color:var(--steel);max-width:30em}
.footer-region{
  margin-top:12px;font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:var(--cyan);
}
.footer-title{
  margin-bottom:14px;font-family:var(--font-body);font-weight:600;
  font-size:11.5px;letter-spacing:.18em;color:var(--muted);
}
.footer-list{display:grid;gap:10px}
.footer-list a{
  position:relative;display:inline-block;padding-left:0;
  font-size:14px;color:var(--steel);
  transition:color .18s var(--ease),padding-left .18s var(--ease);
}
.footer-list a::before{
  content:"";position:absolute;left:0;top:50%;width:0;height:1px;
  background:var(--cyan);transform:translateY(-50%);
  transition:width .18s var(--ease);
}
.footer-list a:hover,.footer-list a:focus-visible{color:var(--cyan);padding-left:15px}
.footer-list a:hover::before,.footer-list a:focus-visible::before{width:10px}
.footer-address{font-style:normal;display:grid;gap:9px}
.footer-line{display:flex;gap:10px;flex-wrap:wrap;font-size:13.5px;color:var(--steel);line-height:1.6}
.footer-key{
  flex:0 0 auto;min-width:62px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--muted);
  padding-top:2px;
}
.footer-note{margin-top:14px;max-width:34em;font-size:12px;line-height:1.75;color:var(--muted)}
.footer-legal{
  margin-top:clamp(32px,4.4vw,58px);
  padding-block:18px 24px;
  border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;gap:10px 28px;align-items:center;justify-content:space-between;
}
.legal-line{margin:0;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.02em;color:var(--muted);line-height:1.7}
.legal-copy{margin:0;font-size:11.5px;letter-spacing:.06em;color:var(--muted)}

/* ===== 09 通用组件：面板 / 索引 / 标题组 ===== */
.panel{
  position:relative;
  background:linear-gradient(180deg,rgba(13,18,32,.96),rgba(8,12,20,.96));
  border:1px solid var(--line);
  box-shadow:inset 0 1px 0 rgba(199,210,224,.05),0 2px 0 rgba(5,7,12,.55);
}
.panel-cut{clip-path:polygon(0 0,100% 0,100% calc(100% - 30px),calc(100% - 30px) 100%,0 100%)}
.index-label{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;
  color:var(--muted);
}
.index-label::before{
  content:"";width:20px;height:1px;
  background:linear-gradient(90deg,var(--cyan),transparent);
}
.index-num{color:var(--lime)}
.section-head{display:grid;gap:12px;margin-bottom:clamp(20px,3vw,36px)}
.section-title{margin:0;font-size:clamp(26px,4vw,46px)}
.section-lead{margin:0;max-width:48ch;font-size:15px;color:var(--steel)}

/* ===== 10 通用组件：数据 / 标签 / 卡片 ===== */
.data-num{
  font-family:var(--font-mono);font-weight:700;color:var(--lime);
  font-variant-numeric:tabular-nums;letter-spacing:-.01em;
}
.data-num--lg{font-size:clamp(28px,4.2vw,46px);line-height:1}
.data-num--sm{font-size:14px}
.data-unit{margin-left:5px;font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--muted)}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;border-radius:var(--pill);
  border:1px solid var(--line);background:rgba(13,18,32,.72);
  font-size:11px;letter-spacing:.12em;color:var(--muted);
}
.tag-cyan{color:var(--cyan);border-color:rgba(34,227,255,.42);background:rgba(34,227,255,.09)}
.tag-lime{color:var(--lime);border-color:rgba(182,255,61,.34);background:rgba(182,255,61,.09)}
.tag-orange{color:var(--orange);border-color:rgba(255,106,43,.42);background:rgba(255,106,43,.11)}
.card{
  display:block;padding:clamp(18px,2.2vw,28px);
  background:linear-gradient(180deg,rgba(13,18,32,.95),rgba(7,10,17,.95));
  border:1px solid var(--line);color:inherit;
  transition:transform .18s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.card-cut{clip-path:polygon(0 0,100% 0,100% calc(100% - 26px),calc(100% - 26px) 100%,0 100%)}
.card:hover,.card:focus-visible{
  transform:translateY(-2px);
  border-color:rgba(34,227,255,.55);
  box-shadow:0 20px 38px -30px rgba(34,227,255,.9);
}

/* ===== 11 响应式图片容器 ===== */
.media-frame{
  position:relative;display:block;width:100%;overflow:hidden;
  aspect-ratio:16/9;
  border:1px solid var(--line);
  background:
    linear-gradient(135deg,rgba(58,34,112,.6),rgba(13,18,32,.92) 54%,rgba(5,7,12,1)),
    radial-gradient(120% 90% at 78% 8%,rgba(34,227,255,.16),transparent 62%);
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}
.media-frame img,.media-frame picture,.media-frame video,.media-frame svg{
  width:100%;height:100%;object-fit:cover;
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,transparent 42%,rgba(5,7,12,.76));
}
.media-frame-caption{
  position:absolute;left:16px;right:16px;bottom:14px;z-index:1;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--steel);
}

/* ===== 12 滚动显现 ===== */
.js [data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
.js [data-reveal="in"]{opacity:1;transform:none}

/* ===== 13 移动端导航面板与断点 ===== */
@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;z-index:5;
    top:calc(100% + 10px);left:0;right:0;
    display:grid;grid-template-columns:1fr;gap:4px;
    padding:14px;
    border:1px solid var(--line);border-radius:22px;
    background:linear-gradient(180deg,rgba(13,18,32,.99),rgba(5,7,12,.99));
    box-shadow:0 32px 64px -36px #000;
    opacity:0;visibility:hidden;transform:translateY(-8px);
    transition:opacity .18s var(--ease),transform .18s var(--ease),visibility .18s var(--ease);
  }
  .site-nav[data-open="true"]{opacity:1;visibility:visible;transform:none}
  .nav-list{flex-direction:column;align-items:stretch;gap:2px}
  .nav-link{display:block;padding:12px 14px;border-radius:14px;font-size:15px;letter-spacing:.04em}
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{
    background:rgba(34,227,255,.11);
    box-shadow:inset 2px 0 0 var(--cyan);
  }
  .nav-cta{width:100%;margin:6px 0 2px;justify-content:center}
  .col-4,.col-5,.col-6,.col-7,.col-8{grid-column:1/-1}
}
@media (max-width:1024px){
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  body{font-size:15.5px}
  .site-header{inset:10px 0 auto 0}
  .header-shell{padding:8px 10px 8px 12px;gap:8px}
  .brand-name{font-size:15.5px}
  .brand-mark{width:26px;height:26px}
  .footer-grid{grid-template-columns:1fr;gap:30px}
  .footer-legal{flex-direction:column;align-items:flex-start}
  .legal-line{font-size:11px}
}

/* ===== 14 降低动态 ===== */
@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}
  .card:hover,.card:focus-visible,.btn-solid:hover{transform:none}
  .site-header[data-shrink="true"] .brand-sub{opacity:1;max-height:16px;transform:none}
}