*,*::before,*::after{box-sizing:border-box}
html,body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dt,dd,address{margin:0;padding:0}
ul,ol{list-style:none}

:root{
  --void:#070B14;
  --deep:#101828;
  --ink:#16202E;
  --line:#263242;
  --silver:#C9D3E0;
  --white:#F5F8FC;
  --cyan:#2BE8D0;
  --amber:#E8B04B;
  --rose:#D96A8A;
  --grass:#7FBF6A;
  --paper:#F2E9DA;
  --mute:#7C8AA0;
  --rail:72px;
  --radius:4px;
  --shadow:0 2px 12px rgba(0,0,0,.35);
  --ease:cubic-bezier(.2,.7,.3,1);
  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;
}

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

body{
  min-height:100vh;
  padding-left:var(--rail);
  background-color:var(--void);
  background-image:
    radial-gradient(1100px 620px at 84% -12%,rgba(43,232,208,.11),transparent 62%),
    radial-gradient(780px 480px at 2% 98%,rgba(217,106,138,.08),transparent 64%),
    radial-gradient(circle,rgba(201,211,224,.30) 1px,transparent 1.2px),
    radial-gradient(circle,rgba(201,211,224,.15) 1px,transparent 1.2px);
  background-size:auto,auto,190px 190px,97px 97px;
  background-position:0 0,0 0,0 0,44px 61px;
  background-attachment:fixed;
  color:var(--silver);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

#main-content{display:block;padding-top:92px}

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:900;
  letter-spacing:-.02em;
  line-height:1.12;
  color:var(--white);
}
h1{font-size:clamp(34px,5.4vw,64px)}
h2{font-size:clamp(26px,3.4vw,40px)}
h3{font-size:24px}
h4{font-size:18px;letter-spacing:0}
p{max-width:38ch}
a{color:var(--silver)}
img{max-width:100%;display:block}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px}
[hidden]{display:none !important}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;left:50%;top:-90px;transform:translateX(-50%);
  z-index:200;padding:10px 20px;border-radius:999px;
  background:var(--cyan);color:#04120f;font-size:14px;font-weight:800;
  text-decoration:none;pointer-events:auto;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:12px}

/* ---------- header shell ---------- */
.site-head{
  position:fixed;inset:0;z-index:80;
  pointer-events:none;
  color:var(--silver);
}
.site-head a,.site-head button{pointer-events:auto}

.brand-rail{
  position:absolute;left:0;top:0;bottom:0;width:var(--rail);
  display:flex;flex-direction:column;align-items:center;gap:14px;
  padding:20px 0 26px;
  background:linear-gradient(180deg,rgba(16,24,40,.94),rgba(7,11,20,.78));
  border-right:1px solid var(--line);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  -webkit-mask-image:linear-gradient(180deg,transparent 0,#000 6%,#000 94%,transparent 100%);
  mask-image:linear-gradient(180deg,transparent 0,#000 6%,#000 94%,transparent 100%);
}

.rail-pulse{
  width:7px;height:7px;border-radius:50%;background:var(--cyan);flex:none;
  animation:railPulse 3.2s ease-out infinite;
}
@keyframes railPulse{
  0%,100%{box-shadow:0 0 0 0 rgba(43,232,208,.45)}
  45%{box-shadow:0 0 0 6px rgba(43,232,208,0)}
}

.rail-mark{
  writing-mode:vertical-rl;text-orientation:upright;
  font-family:var(--font-display);font-weight:900;font-size:15px;
  letter-spacing:.34em;color:var(--white);
}
.rail-chapter{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:var(--cyan);flex:none;
}
.rail-progress{
  position:relative;flex:1 1 auto;min-height:60px;width:1px;
  background:var(--line);display:block;
}
.rail-progress > i{
  position:absolute;left:0;top:0;right:0;height:0;width:100%;
  background:var(--cyan);box-shadow:0 0 8px rgba(43,232,208,.55);
  display:block;
}

.nav-shell{
  position:absolute;top:16px;
  left:calc(var(--rail) + 18px);right:18px;
  display:flex;align-items:center;gap:10px;
  transition:top .2s var(--ease);
}

.nav-brand{
  display:inline-flex;flex-direction:column;gap:1px;flex:none;
  padding:8px 18px;border-radius:999px;
  background:rgba(16,24,40,.86);
  border:1px solid var(--line);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  text-decoration:none;
  transition:border-color .18s var(--ease),background .18s var(--ease);
}
.nav-brand:hover{border-color:var(--cyan);background:rgba(22,32,46,.94)}
.nav-brand-name{
  font-family:var(--font-display);font-weight:900;font-size:15px;
  letter-spacing:-.01em;color:var(--white);line-height:1.3;
}
.nav-brand-sub{
  font-family:var(--font-mono);font-size:9px;letter-spacing:.22em;
  color:var(--mute);line-height:1.2;
}

.nav-capsule{
  margin-left:auto;
  display:flex;align-items:center;gap:3px;
  padding:5px;border-radius:999px;
  background:rgba(16,24,40,.86);
  border:1px solid var(--line);
  box-shadow:var(--shadow);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  transition:padding .2s var(--ease);
}
.nav-capsule a{
  position:relative;display:inline-block;
  padding:8px 13px 8px 22px;border-radius:999px;
  font-size:14px;line-height:1.4;color:var(--silver);
  text-decoration:none;white-space:nowrap;
  border:1px solid transparent;
  transition:color .16s var(--ease),background .16s var(--ease),border-color .16s var(--ease);
}
.nav-capsule a::before{
  content:"";position:absolute;left:9px;top:50%;
  width:5px;height:5px;border-radius:50%;
  background:var(--cyan);opacity:0;
  transform:translateY(-50%);
  transition:opacity .16s var(--ease);
}
.nav-capsule a:hover{color:var(--white);border-color:var(--line);background:rgba(22,32,46,.7)}
.nav-capsule a[aria-current="page"]{
  background:var(--ink);color:var(--white);font-weight:800;
  border-color:transparent;
}
.nav-capsule a[aria-current="page"]::before{opacity:1}

.nav-quick{
  flex:none;display:inline-flex;align-items:center;gap:8px;
  padding:9px 16px;border-radius:999px;
  background:var(--cyan);color:#04120f;
  border:1px solid transparent;
  font-size:13px;font-weight:800;text-decoration:none;
  transition:box-shadow .18s var(--ease),transform .18s var(--ease);
}
.nav-quick:hover{box-shadow:0 0 0 3px rgba(43,232,208,.24)}
.nav-quick:active{transform:translateY(1px)}
.nav-quick-k{letter-spacing:.02em}
.nav-quick-n{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;
  padding:2px 7px;border-radius:999px;background:rgba(4,18,15,.16);
}

.nav-toggle{
  display:none;flex:none;
  flex-direction:column;align-items:center;justify-content:center;gap:4px;
  width:42px;height:42px;padding:0;border-radius:999px;
  background:rgba(16,24,40,.86);border:1px solid var(--line);
  cursor:pointer;
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  transition:border-color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan)}
.nav-toggle-bar{
  display:block;width:16px;height:2px;background:var(--silver);
  transition:transform .18s var(--ease),opacity .18s var(--ease);
}

/* ---------- content primitives ---------- */
.wrap{width:100%;max-width:1240px;margin-inline:auto;padding-inline:32px}
.section{padding-block:72px}
.section-head{display:flex;flex-wrap:wrap;gap:12px 24px;align-items:flex-end;justify-content:space-between;margin-bottom:32px}

.eyebrow{
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--cyan);
}
.eyebrow::before{content:"";width:18px;height:1px;background:currentColor;flex:none}

.anno{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;
  color:var(--mute);writing-mode:vertical-rl;text-orientation:mixed;
}

.data{font-family:var(--font-mono);font-size:.94em;letter-spacing:.04em}
.data--hot{color:var(--cyan)}

.panel{
  background:var(--ink);border:1px solid var(--line);
  border-radius:var(--radius);padding:24px;
  box-shadow:var(--shadow);
}
.panel--paper{
  background:var(--paper);color:var(--deep);border-color:#D8CBB4;
}
.panel--paper h2,.panel--paper h3,.panel--paper h4{color:var(--deep)}

.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 22px;border-radius:999px;
  font-size:14px;font-weight:800;text-decoration:none;
  border:1px solid var(--line);background:transparent;color:var(--white);
  cursor:pointer;
  transition:border-color .18s var(--ease),color .18s var(--ease),background .18s var(--ease),box-shadow .18s var(--ease),transform .18s var(--ease);
}
.btn:hover{border-color:var(--cyan);color:var(--cyan)}
.btn:active{transform:translateY(1px)}
.btn--primary{background:var(--cyan);color:#04120f;border-color:transparent}
.btn--primary:hover{color:#04120f;box-shadow:0 0 0 3px rgba(43,232,208,.24)}
.btn--ghost{background:rgba(22,32,46,.7)}

.rule-zone{
  display:block;height:4px;border-radius:2px;background:var(--line);
  transition:transform .18s var(--ease),opacity .18s var(--ease);
}
.rule-zone--amber{background:var(--amber)}
.rule-zone--rose{background:var(--rose)}
.rule-zone--grass{background:var(--grass)}
.rule-zone--cyan{background:var(--cyan)}
.rule-zone:hover{transform:translateY(-2px);opacity:.92}

.breadcrumbs{
  display:flex;flex-wrap:wrap;gap:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  color:var(--mute);
}
.breadcrumbs li{display:inline-flex;align-items:center;gap:8px}
.breadcrumbs li + li::before{content:"/";color:var(--line)}
.breadcrumbs a{color:var(--silver);text-decoration:none}
.breadcrumbs a:hover{color:var(--cyan)}

.grid-12{display:grid;grid-template-columns:repeat(12,1fr);gap:24px}
.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-12{grid-column:span 12}

.cluster{display:flex;flex-wrap:wrap;gap:12px;align-items:center}
.stack{display:flex;flex-direction:column;gap:16px}

.media-frame{
  position:relative;overflow:hidden;display:block;
  aspect-ratio:16/10;
  border:1px solid var(--line);border-radius:var(--radius);
  background-color:var(--deep);
  background-image:
    radial-gradient(circle,rgba(201,211,224,.22) 1px,transparent 1.3px),
    linear-gradient(135deg,rgba(43,232,208,.10),transparent 58%);
  background-size:120px 120px,auto;
}
.media-frame > img,.media-frame > picture,.media-frame > picture > img{
  width:100%;height:100%;object-fit:cover;display:block;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}

.filter-bar{display:flex;flex-wrap:wrap;gap:8px}
.filter-chip{
  padding:7px 15px;border-radius:999px;
  border:1px solid var(--line);background:transparent;
  color:var(--silver);font-family:var(--font-body);font-size:13px;
  cursor:pointer;
  transition:border-color .16s var(--ease),color .16s var(--ease),background .16s var(--ease);
}
.filter-chip:hover{border-color:var(--cyan);color:var(--white)}
.filter-chip[aria-pressed="true"]{
  background:var(--ink);color:var(--white);border-color:var(--cyan);font-weight:700;
}

[data-reveal]{opacity:0;transform:translateY(10px);transition:opacity .24s var(--ease),transform .24s var(--ease)}
[data-reveal].is-in{opacity:1;transform:none}

/* ---------- footer ---------- */
.site-foot{
  position:relative;margin-top:96px;
  padding:56px 0 28px;
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,var(--deep) 0%,#050810 100%);
  color:var(--silver);
}
.foot-grid{
  max-width:1240px;margin-inline:auto;padding-inline:32px;
  display:grid;grid-template-columns:1.5fr 1fr 1fr 1.4fr;gap:40px 32px;
}
.foot-word{
  font-family:var(--font-display);font-weight:900;font-size:24px;
  letter-spacing:-.02em;color:var(--white);line-height:1.2;
}
.foot-line{
  margin-top:12px;font-size:14px;line-height:1.7;color:var(--silver);
  max-width:24ch;
}
.foot-icp{
  margin-top:18px;font-family:var(--font-mono);font-size:11px;
  letter-spacing:.06em;color:var(--mute);
}
.foot-label{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
  color:var(--mute);margin-bottom:16px;text-transform:uppercase;
}
.foot-nav ul{display:grid;gap:9px}
.foot-nav a{
  font-size:14px;color:var(--silver);text-decoration:none;
  border-bottom:1px solid transparent;padding-bottom:1px;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.foot-nav a:hover{color:var(--cyan);border-color:var(--cyan)}
.zone-set{display:flex;flex-wrap:wrap;gap:8px}
.zone-tag{
  display:inline-flex;align-items:center;gap:7px;
  padding:5px 12px;border-radius:999px;
  font-size:12px;line-height:1.6;
  border:1px solid rgba(255,255,255,.10);
  background:rgba(255,255,255,.03);
  color:var(--silver);
}
.zone-tag::before{
  content:"";width:6px;height:6px;border-radius:50%;
  background:currentColor;flex:none;
}
.zone-tag--amber{color:var(--amber)}
.zone-tag--rose{color:var(--rose)}
.zone-tag--grass{color:var(--grass)}
.zone-tag--cyan{color:var(--cyan)}
.foot-contact address{
  font-style:normal;display:grid;gap:9px;font-size:14px;
}
.foot-key{
  font-family:var(--font-mono);font-size:13px;letter-spacing:.03em;
  color:var(--white);word-break:break-all;
}
.foot-addr{
  font-size:13px;line-height:1.7;color:var(--silver);max-width:34ch;
}
.foot-note{
  margin-top:16px;font-size:12px;line-height:1.75;color:var(--mute);
  max-width:38ch;
}
.foot-base{
  max-width:1240px;margin:40px auto 0;padding:18px 32px 0;
  border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;gap:12px 28px;
  align-items:center;justify-content:space-between;
  font-size:12px;color:var(--mute);
}
.foot-copy{max-width:none}
.foot-legal{display:flex;flex-wrap:wrap;gap:20px}
.foot-legal a{color:var(--mute);text-decoration:none;transition:color .16s var(--ease)}
.foot-legal a:hover{color:var(--cyan)}

/* ---------- tablet ---------- */
@media (max-width:1100px){
  .foot-grid{grid-template-columns:1fr 1fr}
  .nav-capsule a{padding:8px 10px 8px 19px;font-size:13px}
  .nav-capsule a::before{left:8px}
}

/* ---------- mobile ---------- */
@media (max-width:960px){
  body{padding-left:0}
  #main-content{padding-top:108px}

  .brand-rail{
    left:0;right:0;top:0;bottom:auto;
    width:auto;height:44px;
    flex-direction:row;align-items:center;justify-content:flex-start;gap:10px;
    padding:0 14px;
    border-right:0;border-bottom:1px solid var(--line);
    -webkit-mask-image:none;mask-image:none;
  }
  .rail-mark{
    writing-mode:horizontal-tb;text-orientation:mixed;
    font-size:13px;letter-spacing:.18em;
  }
  .rail-chapter{font-size:10px;margin-left:auto;margin-right:6px}
  .rail-pulse{width:6px;height:6px}
  .rail-progress{
    position:absolute;left:0;right:0;bottom:0;
    width:auto;height:2px;min-height:0;background:transparent;
  }
  .rail-progress > i{top:0;left:0;right:auto;height:2px;width:0}

  .nav-shell{top:52px;left:10px;right:10px;gap:8px}
  .nav-brand{display:none}
  .nav-quick{margin-left:auto;padding:8px 14px;font-size:12px}
  .nav-quick-k{font-size:12px}
  .nav-toggle{display:inline-flex}

  .nav-capsule{
    display:none;
    position:absolute;top:calc(100% + 8px);left:0;right:0;
    margin-left:0;
    flex-direction:column;align-items:stretch;gap:2px;
    padding:8px;border-radius:18px;
    background:rgba(16,24,40,.98);
    box-shadow:0 12px 32px rgba(0,0,0,.5);
    z-index:90;
  }
  .site-head[data-nav-open="true"] .nav-capsule{display:flex}
  .nav-capsule a{
    padding:12px 14px 12px 26px;font-size:15px;border-radius:12px;
  }
  .nav-capsule a[aria-current="page"]{padding-left:26px}
  .nav-capsule a::before{left:12px}
  .site-head[data-nav-open="true"] .nav-toggle-bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
  .site-head[data-nav-open="true"] .nav-toggle-bar:nth-child(2){opacity:0}
  .site-head[data-nav-open="true"] .nav-toggle-bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

  .wrap{padding-inline:20px}
  .section{padding-block:52px}
  .grid-12{grid-template-columns:1fr;gap:20px}
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-9,.col-12{grid-column:span 1}
  .site-foot{margin-top:64px;padding-top:44px}
  .foot-grid{grid-template-columns:1fr;gap:32px;padding-inline:20px}
  .foot-base{padding-inline:20px;margin-top:32px}
  .foot-line{max-width:none}
}

@media (max-width:480px){
  h1{font-size:clamp(28px,8.6vw,38px)}
  .nav-quick-n{display:none}
  .foot-legal{gap:14px}
}

/* ---------- desktop-only nav narrowing ---------- */
@media (min-width:961px){
  .site-head[data-scrolled="true"] .nav-shell{top:8px}
  .site-head[data-scrolled="true"] .nav-capsule{padding:3px}
  .site-head[data-scrolled="true"] .nav-capsule a{padding-block:6px}
  .site-head[data-scrolled="true"] .nav-quick{padding-block:7px}
  .site-head[data-scrolled="true"] .nav-brand{padding-block:6px}
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  .rail-pulse{animation:none;box-shadow:0 0 0 4px rgba(43,232,208,.16)}
  [data-reveal]{opacity:1;transform:none}
}