:root{
  --ink:#07130F;
  --panel:#0C2019;
  --band:#123028;
  --cyan:#4FF0D0;
  --cyan-hi:#7DF7DE;
  --cyan-veil:rgba(79,240,208,.14);
  --orange:#FF8A3D;
  --orange-hi:#FFA86A;
  --amber:#FFC24D;
  --paper:#E8F4EE;
  --mist:#9DB5AC;
  --grid:#2A4A40;

  --font-head:"PingFang SC","Noto Sans SC",system-ui,sans-serif;
  --font-body:"PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular","JetBrains Mono",Menlo,monospace;

  --ease:cubic-bezier(.2,.7,.3,1);
  --shell:1320px;
  --pad-x:clamp(16px,3vw,40px);
  --radius:2px;
  --header-h:66px;
}

*,*::before,*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}

body{
  margin:0;
  min-height:100%;
  background:
    radial-gradient(1100px 560px at 88% -8%, rgba(79,240,208,.10), transparent 62%),
    radial-gradient(820px 460px at -6% 6%, rgba(255,138,61,.07), transparent 56%),
    var(--ink);
  background-attachment:fixed;
  color:var(--paper);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.005em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

img,svg,video{max-width:100%;display:block}
button{font:inherit;color:inherit}
a{color:inherit}
ul,ol{margin:0}
h1,h2,h3,h4,p,figure{margin:0}

h1,h2,h3,h4{
  font-family:var(--font-head);
  font-weight:800;
  font-stretch:condensed;
  letter-spacing:-.02em;
  line-height:1.05;
  color:var(--paper);
}
h1{font-size:clamp(32px,4.2vw,56px)}
h2{font-size:clamp(26px,3.2vw,40px)}
h3{font-size:22px;line-height:1.25}
h4{font-size:17px;line-height:1.4}
strong,b{font-weight:700}

::selection{background:var(--cyan);color:var(--ink)}

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

/* ---------- 通用骨架 ---------- */
.container{
  width:min(100%,var(--shell));
  margin-inline:auto;
  padding-inline:var(--pad-x);
}

.prose{
  max-width:34em;
  font-size:17px;
  line-height:1.75;
}
.prose p{color:rgba(232,244,238,.88)}
.prose > * + *{margin-top:1.05em}
.prose h2,.prose h3{margin-top:1.9em}
.prose ul,.prose ol{padding-left:1.25em;color:rgba(232,244,238,.88)}
.prose li + li{margin-top:.35em}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--mist);
}
.eyebrow::before{
  content:"";
  width:18px;
  height:1px;
  background:var(--cyan);
}

.data-num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:-.01em;
  color:var(--cyan);
  line-height:1;
}

.chapter-band{
  height:6px;
  width:100%;
  background:linear-gradient(90deg,var(--band) 0%,rgba(79,240,208,.55) 18%,rgba(79,240,208,0) 64%);
}

.glass{
  background:rgba(18,48,40,.55);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border:1px solid rgba(125,247,222,.25);
}

.tag{
  display:inline-block;
  padding:3px 9px;
  border:1px solid var(--grid);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--mist);
}
.tag--live{border-color:rgba(79,240,208,.5);color:var(--cyan)}
.tag--hot{border-color:rgba(255,138,61,.5);color:var(--orange)}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--mist);
}
.breadcrumb a{
  color:var(--mist);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.breadcrumb a:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.breadcrumb .sep{color:rgba(157,181,172,.5)}
.breadcrumb [aria-current="page"]{color:var(--paper)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5em;
  padding:11px 20px;
  border:1px solid transparent;
  border-radius:var(--radius);
  background:transparent;
  color:var(--paper);
  font-family:var(--font-body);
  font-size:14px;
  font-weight:700;
  letter-spacing:.02em;
  text-decoration:none;
  white-space:nowrap;
  cursor:pointer;
  transition:background-color .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease);
}
.btn-primary{
  background:var(--orange);
  color:var(--ink);
}
.btn-primary:hover{background:var(--orange-hi)}
.btn-primary:active{background:#F07626}
.btn-ghost{
  border-color:var(--grid);
  color:var(--paper);
}
.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan)}

/* ---------- 图片容器 ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  display:block;
  width:100%;
  aspect-ratio:16 / 9;
  border:1px solid var(--grid);
  border-radius:var(--radius);
  background:
    linear-gradient(135deg,rgba(79,240,208,.12),rgba(7,19,15,0) 58%),
    linear-gradient(315deg,rgba(255,138,61,.08),rgba(7,19,15,0) 52%),
    var(--panel);
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  background:rgba(7,19,15,.55);
  pointer-events:none;
}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame--portrait{aspect-ratio:4 / 5}
.media-caption{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  z-index:2;
  padding:14px 16px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.05em;
  color:var(--paper);
  background:linear-gradient(180deg,rgba(7,19,15,0),rgba(7,19,15,.88));
}

/* ---------- 滚动显现协议 ---------- */
.will-reveal{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .32s var(--ease),transform .32s var(--ease);
}
.will-reveal.is-revealed{
  opacity:1;
  transform:none;
}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;
  left:12px;
  top:-90px;
  z-index:200;
  padding:10px 18px;
  background:var(--cyan);
  color:var(--ink);
  font-size:14px;
  font-weight:700;
  text-decoration:none;
  border-radius:var(--radius);
  transition:top .18s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{top:12px}

/* ================= 头部 ================= */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(18,48,40,.62);
  -webkit-backdrop-filter:blur(10px) saturate(1.15);
  backdrop-filter:blur(10px) saturate(1.15);
  border-top:1px solid var(--grid);
  border-bottom:1px solid var(--grid);
}

.header-inner{
  position:relative;
  display:flex;
  align-items:center;
  gap:clamp(14px,2.2vw,32px);
  width:min(100%,var(--shell));
  margin-inline:auto;
  padding:10px var(--pad-x);
  min-height:var(--header-h);
}

.brand{
  flex:0 0 auto;
  display:flex;
  flex-direction:column;
  gap:2px;
  padding-bottom:5px;
  border-bottom:1px solid var(--grid);
  text-decoration:none;
}
.brand-mark{
  font-family:var(--font-head);
  font-weight:800;
  font-stretch:condensed;
  font-size:clamp(20px,2.4vw,26px);
  letter-spacing:-.02em;
  line-height:1;
  color:var(--paper);
}
.brand-sub{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  line-height:1;
  color:var(--mist);
}
.brand:hover .brand-mark{color:var(--cyan)}

.primary-nav{
  flex:1 1 auto;
  display:flex;
  min-width:0;
}
.nav-list{
  display:flex;
  align-items:center;
  gap:clamp(10px,1.7vw,26px);
  list-style:none;
  margin:0;
  padding:0;
}
.nav-list a{
  position:relative;
  display:inline-block;
  padding:8px 2px;
  font-size:14px;
  font-weight:600;
  letter-spacing:.01em;
  color:var(--mist);
  text-decoration:none;
  white-space:nowrap;
  transition:color .2s var(--ease);
}
.nav-list a::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .25s var(--ease),background-color .2s var(--ease);
}
.nav-list a:hover{color:var(--paper)}
.nav-list a:hover::after{
  background:var(--cyan);
  transform:scaleX(1);
}
.nav-list a[aria-current="page"]{color:var(--cyan)}
.nav-list a[aria-current="page"]::after{
  background:var(--cyan);
  transform:scaleX(1);
}

.header-utility{
  flex:0 0 auto;
  display:flex;
  align-items:center;
  gap:clamp(10px,1.4vw,18px);
}
.utility-link{
  font-size:13px;
  color:var(--mist);
  text-decoration:none;
  padding-bottom:2px;
  border-bottom:1px dashed var(--grid);
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.utility-link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.header-utility .btn{
  padding:9px 16px;
  font-size:13px;
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  margin-left:auto;
  padding:8px 12px;
  background:transparent;
  border:1px solid var(--grid);
  border-radius:var(--radius);
  color:var(--paper);
  font-size:12px;
  font-weight:600;
  letter-spacing:.1em;
  cursor:pointer;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle-bars{
  position:relative;
  display:block;
  width:16px;
  height:2px;
  background:var(--cyan);
  transition:background-color .2s var(--ease);
}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0;
  width:16px;
  height:2px;
  background:var(--cyan);
  transition:transform .22s var(--ease);
}
.nav-toggle-bars::before{top:-5px}
.nav-toggle-bars::after{top:5px}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{transform:translateY(-5px) rotate(-45deg)}
.nav-toggle-label{line-height:1}

.scroll-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--cyan-hi) 62%,var(--orange) 100%);
  pointer-events:none;
}

/* ================= 页脚 ================= */
.site-footer{
  position:relative;
  margin-top:clamp(56px,9vw,110px);
  background:var(--panel);
  border-top:1px solid var(--grid);
  color:var(--paper);
}

.footer-inner{
  width:min(100%,var(--shell));
  margin-inline:auto;
  padding:clamp(40px,5vw,68px) var(--pad-x) clamp(28px,3vw,44px);
  display:grid;
  grid-template-columns:minmax(0,1.15fr) minmax(0,1.85fr) minmax(0,1.15fr);
  gap:clamp(28px,4vw,56px);
  align-items:start;
}

.footer-brand{
  border-left:2px solid var(--cyan);
  padding-left:16px;
}
.footer-mark{
  font-family:var(--font-head);
  font-weight:800;
  font-stretch:condensed;
  font-size:26px;
  line-height:1;
  letter-spacing:-.02em;
  color:var(--paper);
}
.footer-tag{
  margin-top:7px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--mist);
}
.footer-note{
  margin-top:14px;
  max-width:26em;
  font-size:13px;
  line-height:1.7;
  color:var(--mist);
}

.footer-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(16px,2.4vw,32px);
}
.footer-col{min-width:0}
.footer-col-title{
  padding-bottom:10px;
  margin-bottom:12px;
  border-bottom:1px solid var(--grid);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.2em;
  color:var(--cyan);
}
.footer-col-list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:8px;
}
.footer-col-list a{
  font-size:14px;
  line-height:1.5;
  color:rgba(232,244,238,.8);
  text-decoration:none;
  transition:color .2s var(--ease);
}
.footer-col-list a:hover{color:var(--cyan)}

.footer-contact{min-width:0}
.contact-row{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  align-items:center;
  gap:4px 10px;
  padding:9px 0;
  border-bottom:1px dashed rgba(42,74,64,.85);
}
.contact-row:first-child{padding-top:0}
.contact-label{
  grid-column:1 / -1;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--mist);
}
.contact-value{
  font-size:13.5px;
  line-height:1.5;
  color:var(--paper);
  overflow-wrap:anywhere;
}
.copy-btn{
  padding:3px 9px;
  background:transparent;
  border:1px solid var(--grid);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--mist);
  cursor:pointer;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.copy-btn:hover{border-color:var(--cyan);color:var(--cyan)}
.copy-btn.is-copied{border-color:var(--amber);color:var(--amber)}
.contact-note{
  margin-top:12px;
  font-size:12px;
  line-height:1.65;
  color:var(--mist);
}

.footer-legal{
  border-top:1px solid var(--grid);
  padding:16px 0 26px;
}
.footer-legal-inner{
  width:min(100%,var(--shell));
  margin-inline:auto;
  padding-inline:var(--pad-x);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.03em;
  color:var(--mist);
}
.legal-copy,
.legal-icp{
  margin:0;
  color:var(--mist);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.03em;
}
.footer-links{
  display:flex;
  flex-wrap:wrap;
  gap:8px 18px;
}
.footer-links a{
  color:var(--mist);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-links a:hover{color:var(--cyan);border-bottom-color:var(--cyan)}

.footer-band{
  height:6px;
  background:linear-gradient(90deg,var(--band) 0%,rgba(79,240,208,.85) 55%,var(--orange) 100%);
}

/* ================= 响应式 ================= */
@media (max-width:1080px){
  .footer-inner{
    grid-template-columns:minmax(0,1fr) minmax(0,1.7fr);
  }
  .footer-contact{grid-column:1 / -1}
}

@media (max-width:960px){
  .nav-toggle{display:inline-flex}
  .header-utility{margin-left:0}
  .header-utility .utility-link{display:none}
  .header-utility .btn{padding:8px 12px;font-size:12px;letter-spacing:0}

  .primary-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    display:block;
    padding:8px var(--pad-x) 22px;
    background:rgba(12,32,25,.97);
    -webkit-backdrop-filter:blur(14px);
    backdrop-filter:blur(14px);
    border-bottom:1px solid var(--grid);
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .24s var(--ease),transform .24s var(--ease),visibility .24s linear;
  }
  .primary-nav[data-open]{
    opacity:1;
    visibility:visible;
    transform:none;
  }
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  .nav-list li + li{border-top:1px solid rgba(42,74,64,.6)}
  .nav-list a{
    display:block;
    padding:14px 4px;
    font-size:15px;
  }
  .nav-list a::after{display:none}
  .nav-list a[aria-current="page"]{color:var(--cyan)}
}

@media (max-width:720px){
  .footer-inner{grid-template-columns:1fr}
  .footer-cols{grid-template-columns:repeat(auto-fit,minmax(132px,1fr))}
  .footer-legal-inner{
    flex-direction:column;
    align-items:flex-start;
  }
}

@media (max-width:480px){
  .brand-sub{display:none}
  .brand-mark{font-size:20px}
  .header-inner{padding-block:12px}
  .nav-toggle-label{display:none}
  .header-utility .btn{padding:8px 10px;font-size:11.5px}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  html{scroll-behavior:auto}
  .will-reveal{opacity:1;transform:none;transition:none}
  .scroll-progress{transition:none}
}