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

:root{
  --ink-900:#0B1B33;
  --ink-700:#13294B;
  --ink-500:#1E3A66;
  --cyan-500:#00E5D0;
  --cyan-300:#6FF6E8;
  --orange-500:#FF7A1A;
  --orange-300:#FFB066;
  --cream-100:#F4EFE3;
  --cream-300:#E4DAC6;
  --brown-900:#231A12;
  --line-100:#F8FAFC;

  --font-display:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-body:var(--font-display);
  --font-mono:ui-monospace,"JetBrains Mono","SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;

  --rule:rgba(111,246,232,.16);
  --rule-strong:rgba(111,246,232,.38);

  --frame:clamp(18px,4vw,56px);
  --maxw:1280px;
  --header-h:74px;
  --ease:cubic-bezier(.22,.72,.28,1);
  --scroll-progress:0;
  --reveal-delay:0ms;
}

body{
  background:var(--ink-900);
  color:var(--line-100);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  min-height:100vh;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
body::before{
  content:"";
  position:fixed;
  top:0;bottom:0;left:14px;right:14px;
  border-left:1px solid rgba(0,229,208,.10);
  border-right:1px solid rgba(0,229,208,.10);
  pointer-events:none;
  z-index:5;
}
body.nav-open{overflow:hidden;}

h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;line-height:1.15;letter-spacing:-.02em;}

:focus-visible{outline:2px solid var(--cyan-500);outline-offset:3px;border-radius:2px;}

.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;top:-76px;left:16px;z-index:200;
  background:var(--orange-500);color:#1B1208;
  font-weight:800;font-size:14px;letter-spacing:.02em;
  padding:11px 18px;border-radius:3px;text-decoration:none;
  transition:top .22s var(--ease);
}
.skip-link:focus{top:12px;}

/* ---------- 排版原子 ---------- */
.display{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(34px,7vw,72px);
  line-height:1.02;
  letter-spacing:-.03em;
  margin:0;
}
.display-accent{color:var(--cyan-500);}
.headline{font-size:clamp(23px,3.4vw,38px);font-weight:900;line-height:1.12;letter-spacing:-.025em;margin:0;}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.24em;color:var(--cyan-300);
}
.eyebrow::before{content:"";display:block;width:26px;height:1px;background:var(--cyan-500);}
.lede{font-size:clamp(15px,1.5vw,18px);line-height:1.8;color:rgba(248,250,252,.76);max-width:64ch;}
.meta-mono{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:rgba(111,246,232,.8);}
.index-tag{display:inline-block;font-family:var(--font-mono);font-size:13px;font-weight:700;letter-spacing:.06em;color:var(--cyan-500);}
.vertical-note{writing-mode:vertical-rl;text-orientation:mixed;font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;color:var(--cyan-300);opacity:.78;}
.tag{
  display:inline-block;font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  padding:4px 10px;border-radius:999px;
  border:1px solid rgba(255,176,102,.5);
  color:var(--orange-300);background:rgba(255,122,26,.1);
}

/* ---------- 布局 ---------- */
.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--frame);}
.wrap-narrow{max-width:860px;}
.section{padding:clamp(52px,7vw,104px) 0;position:relative;z-index:2;}
.section-light{
  background:var(--cream-100);color:var(--brown-900);
  --rule:rgba(35,26,18,.18);
  --rule-strong:rgba(35,26,18,.4);
}
.section-dark{background:var(--ink-700);}
.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:18px;margin-bottom:clamp(24px,3vw,42px);
}
.grid{display:grid;gap:clamp(16px,2.4vw,28px);}
.grid-12{grid-template-columns:repeat(12,minmax(0,1fr));}
.col-2,.col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-9,.col-10,.col-12{grid-column:1 / -1;}
@media (min-width:860px){
  .col-2{grid-column:span 2;}
  .col-3{grid-column:span 3;}
  .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-9{grid-column:span 9;}
  .col-10{grid-column:span 10;}
  .col-12{grid-column:span 12;}
}
.rule{display:block;height:1px;border:0;margin:0;background:linear-gradient(90deg,rgba(0,229,208,.5),rgba(111,246,232,.1) 62%,transparent);}
.section-light .rule{background:linear-gradient(90deg,rgba(35,26,18,.45),rgba(35,26,18,.08) 62%,transparent);}

/* ---------- 面板 / 卡片 / 行列表 ---------- */
.panel{
  background:var(--ink-700);border:1px solid var(--rule);border-radius:5px;
  padding:clamp(18px,2.4vw,28px);
}
.panel-glass{
  background:rgba(19,41,75,.55);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  border:1px solid rgba(0,229,208,.22);border-radius:5px;
  padding:clamp(16px,2vw,22px);
}
.section-light .panel{background:var(--cream-300);border-color:rgba(35,26,18,.16);}
.card{
  display:flex;flex-direction:column;gap:12px;
  background:var(--ink-700);border:1px solid var(--rule);border-radius:5px;
  padding:clamp(18px,2.2vw,26px);
  transition:border-color .24s var(--ease),transform .24s var(--ease);
}
.card:hover{border-color:rgba(0,229,208,.42);transform:translateY(-2px);}
.card-index{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--cyan-500);}
.list-rows{list-style:none;margin:0;padding:0;}
.list-rows > li{
  display:flex;flex-wrap:wrap;gap:6px 18px;align-items:baseline;
  padding:15px 0;border-bottom:1px solid var(--rule);
}
.list-rows > li:first-child{border-top:1px solid var(--rule);}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 20px;border-radius:3px;border:1px solid transparent;
  font-size:14px;font-weight:700;letter-spacing:.02em;text-decoration:none;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.btn-primary{background:var(--orange-500);color:#1B1208;}
.btn-primary:hover{background:var(--orange-300);transform:translateY(-1px);}
.btn-ghost{border-color:rgba(0,229,208,.42);color:var(--cyan-300);}
.btn-ghost:hover{background:rgba(0,229,208,.1);border-color:var(--cyan-500);color:var(--line-100);}
.section-light .btn-ghost{border-color:rgba(15,111,102,.5);color:#0F6F66;}
.section-light .btn-ghost:hover{background:rgba(15,111,102,.1);color:var(--brown-900);}

/* ---------- 面包屑 ---------- */
.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:rgba(248,250,252,.55);
}
.breadcrumb-link{color:var(--cyan-300);text-decoration:none;border-bottom:1px solid transparent;transition:border-color .2s;}
.breadcrumb-link:hover{border-bottom-color:var(--cyan-500);}
.breadcrumb-sep{color:rgba(111,246,232,.35);}
.section-light .breadcrumbs{color:rgba(35,26,18,.6);}
.section-light .breadcrumb-link{color:#0F6F66;}
.section-light .breadcrumb-sep{color:rgba(35,26,18,.35);}

/* ---------- 图片容器基础规则 ---------- */
.figure{display:block;margin:0;}
.figure-media{
  position:relative;overflow:hidden;border-radius:4px;
  aspect-ratio:16 / 9;
  background:linear-gradient(140deg,var(--ink-700) 0%,var(--ink-900) 100%);
  border:1px solid var(--rule);
}
.figure-media::before{
  content:"";position:absolute;left:0;top:0;z-index:2;
  width:38px;height:3px;background:var(--cyan-500);
}
.figure-media > img,
.figure-media > svg{width:100%;height:100%;object-fit:cover;}
.figure-media[data-ratio="4:3"]{aspect-ratio:4 / 3;}
.figure-media[data-ratio="1:1"]{aspect-ratio:1 / 1;}
.figure-media[data-ratio="21:9"]{aspect-ratio:21 / 9;}
.figure-caption{margin-top:10px;font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:rgba(248,250,252,.55);}
.section-light .figure-caption{color:rgba(35,26,18,.62);}

/* ---------- 亮区文字与强调调整 ---------- */
.section-light .lede{color:rgba(35,26,18,.8);}
.section-light .meta-mono{color:rgba(35,26,18,.7);}
.section-light .eyebrow{color:#0F6F66;}
.section-light .eyebrow::before{background:#0F6F66;}
.section-light .index-tag{color:#0F6F66;}

/* ---------- 头部 ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:var(--ink-900);
  border-bottom:1px solid var(--rule);
}
.header-inner{
  position:relative;z-index:2;
  max-width:var(--maxw);margin-inline:auto;
  min-height:var(--header-h);
  padding:12px var(--frame);
  display:flex;align-items:center;gap:14px;
}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;min-width:0;}
.brand-mark{
  flex:none;width:40px;height:40px;display:grid;place-items:center;
  font-family:var(--font-mono);font-size:13px;font-weight:700;letter-spacing:.02em;
  color:#04211E;
  background:linear-gradient(135deg,var(--cyan-500) 0%,var(--cyan-300) 62%,var(--orange-300) 100%);
  clip-path:polygon(0 0,100% 0,100% 70%,70% 100%,0 100%);
}
.brand-text{display:flex;flex-direction:column;min-width:0;}
.brand-name{font-size:16px;font-weight:900;letter-spacing:-.01em;line-height:1.25;color:var(--line-100);white-space:nowrap;}
.brand-line{font-family:var(--font-mono);font-size:10px;letter-spacing:.12em;line-height:1.6;color:rgba(111,246,232,.78);white-space:nowrap;}
@media (max-width:520px){.brand-line{display:none;}}

.nav-toggle{
  margin-left:auto;
  display:inline-flex;align-items:center;gap:10px;
  padding:9px 12px;border:1px solid var(--rule-strong);border-radius:3px;
  background:rgba(0,229,208,.06);color:var(--cyan-300);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;
  transition:background .2s var(--ease),border-color .2s var(--ease);
}
.nav-toggle:hover{background:rgba(0,229,208,.13);border-color:var(--cyan-500);}
.nav-toggle-bars{display:inline-flex;flex-direction:column;gap:4px;}
.nav-toggle-bar{display:block;width:16px;height:2px;background:var(--cyan-500);transition:transform .25s var(--ease);}
.site-header[data-open] .nav-toggle-bar:nth-child(1){transform:translateY(3px) rotate(45deg);}
.site-header[data-open] .nav-toggle-bar:nth-child(2){transform:translateY(-3px) rotate(-45deg);}
.nav-toggle-label{line-height:1;}

.primary-nav{
  position:fixed;inset:0;z-index:1;
  display:flex;flex-direction:column;gap:20px;
  padding:calc(var(--header-h) + 24px) var(--frame) 40px;
  background:rgba(11,27,51,.99);
  overflow-y:auto;
  opacity:0;visibility:hidden;transform:translateY(-12px);
  transition:opacity .26s var(--ease),transform .26s var(--ease),visibility 0s linear .26s;
}
.site-header[data-open] .primary-nav{
  opacity:1;visibility:visible;transform:none;
  transition:opacity .26s var(--ease),transform .26s var(--ease),visibility 0s;
}
.nav-index{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;border-top:1px solid var(--rule);}
.nav-item{border-bottom:1px solid var(--rule);}
.nav-link{
  display:flex;align-items:baseline;gap:14px;
  padding:15px 4px;text-decoration:none;
  font-size:20px;font-weight:800;letter-spacing:-.01em;color:var(--line-100);
  transition:color .2s var(--ease),background .2s var(--ease);
}
.nav-num{font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.06em;color:var(--cyan-500);}
.nav-link:hover{color:var(--cyan-300);}
.nav-link[aria-current="page"]{color:var(--orange-300);}
.nav-link[aria-current="page"] .nav-num{color:var(--orange-500);}
.nav-utility{display:flex;flex-wrap:wrap;gap:10px 16px;}
.nav-utility-link{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  color:rgba(111,246,232,.78);text-decoration:none;
  border-bottom:1px dashed rgba(111,246,232,.3);padding-bottom:2px;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.nav-utility-link:hover{color:var(--line-100);border-bottom-color:var(--cyan-500);}
.nav-cta{align-self:flex-start;}

.header-tick{
  position:relative;height:5px;
  border-top:1px solid rgba(0,229,208,.22);
  background-image:repeating-linear-gradient(90deg,rgba(0,229,208,.42) 0 1px,transparent 1px 64px);
  pointer-events:none;
}
.header-tick::after{
  content:"";position:absolute;left:0;top:0;bottom:0;width:78px;
  background:linear-gradient(90deg,var(--cyan-500),transparent);
  opacity:.65;
}

@media (min-width:1100px){
  .site-header{
    background:rgba(11,27,51,.86);
    -webkit-backdrop-filter:blur(14px) saturate(150%);
    backdrop-filter:blur(14px) saturate(150%);
  }
  .nav-toggle{display:none;}
  .primary-nav{
    position:static;inset:auto;z-index:auto;
    flex-direction:row;align-items:center;gap:6px;
    margin-left:auto;padding:0;overflow:visible;
    background:none;
    opacity:1;visibility:visible;transform:none;transition:none;
  }
  .nav-index{flex-direction:row;border-top:0;gap:2px;}
  .nav-item{border-bottom:0;}
  .nav-link{
    padding:9px 12px;gap:7px;
    font-size:13.5px;font-weight:600;letter-spacing:0;
    color:rgba(248,250,252,.72);
    border:1px solid transparent;border-radius:3px;
  }
  .nav-link .nav-num{font-size:10px;color:var(--cyan-500);opacity:.85;}
  .nav-link:hover{color:var(--line-100);background:rgba(0,229,208,.08);border-color:rgba(0,229,208,.28);}
  .nav-link[aria-current="page"]{color:var(--orange-300);background:rgba(255,122,26,.12);border-color:rgba(255,122,26,.5);}
  .nav-link[aria-current="page"] .nav-num{color:var(--orange-500);opacity:1;}
  .nav-utility{display:none;}
  .nav-cta{margin-left:10px;padding:10px 16px;font-size:13px;}
}
@media (min-width:1320px){
  .nav-utility{display:flex;gap:14px;margin-left:8px;}
  .nav-utility-link{font-size:11px;}
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;z-index:2;
  padding:clamp(48px,6vw,76px) 0 0;
  background:var(--ink-900);
  color:rgba(248,250,252,.72);
  border-top:1px solid var(--rule);
}
.footer-frame{display:block;}
.footer-top{display:grid;gap:34px;grid-template-columns:1fr;}
@media (min-width:900px){
  .footer-top{grid-template-columns:minmax(230px,300px) 1fr;gap:48px;}
}
.footer-brand{display:flex;flex-direction:column;gap:10px;}
.footer-brand-name{
  font-size:20px;font-weight:900;letter-spacing:-.02em;color:var(--line-100);
  font-family:var(--font-display);
}
.footer-brand-line{font-size:13.5px;line-height:1.7;color:rgba(248,250,252,.66);}
.footer-frame-note{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  color:rgba(111,246,232,.7);
  border-left:2px solid var(--cyan-500);padding-left:10px;
}
.footer-columns{display:grid;gap:26px;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));}
.footer-col{display:flex;flex-direction:column;gap:14px;}
.footer-col-title{
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.2em;color:var(--cyan-300);
}
.footer-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px;}
.footer-link{
  font-size:14px;color:rgba(248,250,252,.7);text-decoration:none;
  border-bottom:1px solid transparent;transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-link:hover{color:var(--cyan-300);border-bottom-color:var(--cyan-500);}
.footer-contact{
  display:grid;gap:10px;
  margin-top:clamp(30px,4vw,46px);
  padding-top:24px;
  border-top:1px dashed var(--rule-strong);
}
@media (min-width:760px){
  .footer-contact{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px 34px;}
}
.footer-contact-item{display:flex;flex-wrap:wrap;gap:6px 12px;font-size:13.5px;align-items:baseline;}
.footer-contact-label{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:var(--orange-300);min-width:64px;
}
.footer-contact-value{color:rgba(248,250,252,.8);}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 26px;
  margin-top:clamp(26px,3vw,40px);
  padding-top:20px;padding-bottom:26px;
  border-top:1px solid var(--rule);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;
  color:rgba(248,250,252,.5);
}
.footer-copy{white-space:nowrap;}
.footer-icp{color:rgba(111,246,232,.72);}
.footer-note{flex:1 1 320px;line-height:1.7;}
.site-footer::after{
  content:"";display:block;height:6px;
  border-top:1px solid rgba(0,229,208,.18);
  background-image:repeating-linear-gradient(90deg,rgba(0,229,208,.32) 0 1px,transparent 1px 72px);
}

/* ---------- 滚动进度标尺 ---------- */
.scroll-progress{
  position:fixed;top:0;right:14px;bottom:0;width:3px;z-index:70;
  background-image:repeating-linear-gradient(180deg,rgba(248,250,252,.12) 0 1px,transparent 1px 12px);
  pointer-events:none;
}
.scroll-progress-fill{
  position:absolute;left:0;right:0;top:0;
  height:calc(var(--scroll-progress,0) * 100%);
  background:linear-gradient(180deg,var(--cyan-500) 0%,var(--cyan-300) 55%,var(--orange-500) 100%);
  box-shadow:0 0 12px rgba(0,229,208,.45);
}
@media (max-width:720px){
  body::before{left:6px;right:6px;}
  .scroll-progress{right:6px;width:2px;}
}

/* ---------- 滚动显现 ---------- */
html[data-reveal-ready] .reveal{
  opacity:0;transform:translateY(12px);
  transition:opacity .6s var(--ease) var(--reveal-delay,0ms),
             transform .6s var(--ease) var(--reveal-delay,0ms);
}
html[data-reveal-ready] .reveal.is-visible{opacity:1;transform:none;}

/* ---------- 降级 ---------- */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
  html[data-reveal-ready] .reveal{opacity:1 !important;transform:none !important;transition:none !important;}
}