/* ==========================================================================
   SE·361 共享样式 / assets/site.css
   1 reset  2 tokens  3 base  4 utilities  5 buttons
   6 header  7 footer  8 page components  9 responsive  10 motion
   ========================================================================== */

/* ---------- 1. reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd,address{margin:0;}
ul,ol{list-style:none;padding:0;}
button,input,select,textarea{font:inherit;color:inherit;}
img,svg{max-width:100%;}
a{color:inherit;text-decoration:none;}
table{border-collapse:collapse;width:100%;}
address{font-style:normal;}
[hidden]{display:none !important;}

/* ---------- 2. tokens ---------- */
:root{
  --felt:#0B1F1A;
  --felt-2:#12302A;
  --panel:#173F38;
  --cyan:#2BE8C8;
  --cyan-soft:#7CF3DE;
  --amber:#F2B33D;
  --amber-deep:#B87A18;
  --paper:#F2F7F4;
  --muted:#9DB4AC;
  --line:#2A4A43;
  --coral:#D9553F;
  --ink:#062A22;

  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:ui-monospace,"JetBrains Mono","SFMono-Regular","Cascadia Mono",Consolas,"Liberation Mono",monospace;

  --cut-lg:16px;
  --cut:12px;
  --cut-sm:8px;

  --shell-max:1180px;
  --gutter:clamp(1rem,3vw,2.25rem);
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ---------- 3. base ---------- */
body{
  min-height:100vh;
  background-color:var(--felt);
  background-image:
    radial-gradient(900px 520px at 12% -8%, rgba(43,232,200,.10), transparent 62%),
    radial-gradient(720px 420px at 96% 2%, rgba(242,179,61,.07), transparent 60%),
    linear-gradient(180deg,#0B1F1A 0%,#0A1D18 58%,#081814 100%);
  color:var(--paper);
  font-family:var(--font-sans);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:1;
  pointer-events:none;
  opacity:.35;
  mix-blend-mode:screen;
  background-image:
    radial-gradient(rgba(242,247,244,.055) 1px, transparent 1px),
    radial-gradient(rgba(43,232,200,.05) 1px, transparent 1px);
  background-size:3px 3px, 7px 7px;
  background-position:0 0, 1px 2px;
}

h1,h2,h3,h4,h5{font-weight:800;letter-spacing:.03em;line-height:1.18;color:var(--paper);}
h1{font-size:clamp(34px,5vw,64px);letter-spacing:.02em;}
h2{font-size:clamp(24px,3.4vw,32px);}
h3{font-size:clamp(18px,2.2vw,24px);font-weight:700;}
h4{font-size:18px;font-weight:700;}
h5{font-size:16px;font-weight:700;color:var(--cyan-soft);}
p{overflow-wrap:break-word;}

:where(a,button,input,select,summary,[tabindex]):focus-visible{
  outline:2px solid var(--cyan-soft);
  outline-offset:2px;
}

::selection{background:rgba(43,232,200,.28);color:var(--paper);}

/* ---------- 4. utilities ---------- */
.shell{
  width:100%;
  max-width:var(--shell-max);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.mono{font-family:var(--font-mono);letter-spacing:.04em;}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.55rem;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--cyan);
}
.eyebrow::before{
  content:"";
  width:18px;
  height:1px;
  background:var(--cyan);
  box-shadow:0 0 8px rgba(43,232,200,.6);
}
.rule-slant{
  height:4px;
  background-image:repeating-linear-gradient(-45deg,var(--line) 0 1px,transparent 1px 8px);
  opacity:.95;
}
.section{padding-block:clamp(2rem,5vw,3.5rem);}
.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:.6rem 1.5rem;
  padding-bottom:.85rem;
  margin-bottom:clamp(1rem,2.5vw,1.75rem);
  background-image:repeating-linear-gradient(-45deg,var(--line) 0 1px,transparent 1px 8px);
  background-repeat:no-repeat;
  background-position:0 100%;
  background-size:100% 4px;
}

/* ---------- 5. buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.45rem;
  padding:.58rem 1.05rem;
  border:1px solid var(--line);
  background:transparent;
  color:var(--paper);
  font-size:14px;
  font-weight:700;
  letter-spacing:.05em;
  line-height:1.4;
  cursor:pointer;
  white-space:nowrap;
  clip-path:polygon(0 0,100% 0,100% calc(100% - var(--cut-sm)),calc(100% - var(--cut-sm)) 100%,0 100%);
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}
.btn:active{transform:translateY(1px);}
.btn:focus-visible{box-shadow:inset 0 0 0 2px var(--cyan-soft);}
.btn--amber{
  background:linear-gradient(180deg,#F7C158,#F2B33D);
  border-color:transparent;
  color:#23180A;
}
.btn--amber:hover{background:var(--amber-deep);color:#1A1206;}
.btn--ghost{
  background:rgba(23,63,56,.55);
  border-color:var(--line);
  color:var(--cyan);
}
.btn--ghost:hover{border-color:var(--cyan);background:rgba(43,232,200,.12);color:var(--cyan-soft);}
.btn--cyan{
  background:rgba(43,232,200,.12);
  border-color:var(--cyan);
  color:var(--cyan-soft);
}
.btn--cyan:hover{background:rgba(43,232,200,.24);color:#04211C;}
.link-more{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  padding-bottom:.15rem;
  border-bottom:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--cyan);
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.link-more::after{content:"→";transition:transform .18s var(--ease);}
.link-more:hover{color:var(--cyan-soft);border-color:var(--cyan);}
.link-more:hover::after{transform:translateX(3px);}

/* ---------- 6. header ---------- */
.skip-link{
  position:fixed;
  top:.6rem;
  left:.6rem;
  z-index:120;
  padding:.6rem 1rem;
  background:var(--cyan);
  color:var(--ink);
  font-weight:700;
  letter-spacing:.04em;
  transform:translateY(-180%);
  transition:transform .18s var(--ease);
  clip-path:polygon(0 0,100% 0,100% calc(100% - var(--cut-sm)),calc(100% - var(--cut-sm)) 100%,0 100%);
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0);}

.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:#0A1D18;
  box-shadow:0 1px 0 var(--line), 0 14px 30px rgba(2,10,8,.45);
}
.scroll-meter{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  background:rgba(42,74,67,.55);
  overflow:hidden;
}
.scroll-meter__bar{
  display:block;
  width:0%;
  height:100%;
  background:linear-gradient(90deg,var(--cyan),var(--amber));
  transition:width .12s linear;
}

/* 品牌条 */
.brandbar{
  padding:.75rem 0 .7rem;
  background:linear-gradient(90deg,rgba(18,48,42,.92),rgba(11,31,26,.62) 62%,rgba(11,31,26,.92));
  border-bottom:1px solid var(--line);
}
.brandbar__inner{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  grid-template-areas:"brand search meta";
  align-items:center;
  gap:.7rem 1.5rem;
}
.brand{
  grid-area:brand;
  display:inline-flex;
  align-items:center;
  gap:.7rem;
  color:var(--paper);
  justify-self:start;
}
.brand__mark{
  display:grid;
  place-items:center;
  width:42px;
  height:42px;
  font-family:var(--font-mono);
  font-size:14px;
  font-weight:700;
  letter-spacing:.04em;
  color:var(--ink);
  background:linear-gradient(140deg,var(--cyan),var(--cyan-soft));
  box-shadow:0 0 22px rgba(43,232,200,.28);
  clip-path:polygon(0 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%);
}
.brand__text{display:flex;flex-direction:column;line-height:1.25;}
.brand__name{font-size:18px;font-weight:800;letter-spacing:.04em;}
.brand__tag{font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--muted);}
.brand:hover .brand__tag{color:var(--cyan-soft);}

/* 检索台 */
.search-dock{
  grid-area:search;
  display:flex;
  align-items:center;
  gap:.5rem;
  width:100%;
  max-width:540px;
  justify-self:center;
}
.search-dock__label{
  position:absolute;
  width:1px;
  height:1px;
  padding:0;
  overflow:hidden;
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}
.search-dock__field{
  display:flex;
  align-items:stretch;
  flex:1 1 auto;
  min-width:0;
  border:1px solid var(--line);
  background:rgba(6,24,20,.85);
  box-shadow:inset 0 0 0 0 rgba(43,232,200,0);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);
  transition:box-shadow .18s var(--ease),border-color .18s var(--ease);
}
.search-dock__field:focus-within{
  border-color:var(--cyan);
  box-shadow:inset 0 0 0 1px rgba(43,232,200,.55);
}
.search-dock__type{
  flex:0 0 auto;
  max-width:7.5em;
  padding:.45rem .55rem;
  border:0;
  border-right:1px solid var(--line);
  background:transparent;
  color:var(--cyan-soft);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  cursor:pointer;
}
.search-dock__type option{background:#0B1F1A;color:var(--paper);}
.search-dock__input{
  flex:1 1 auto;
  min-width:0;
  padding:.5rem .7rem;
  border:0;
  background:transparent;
  color:var(--paper);
  font-size:14px;
  -webkit-appearance:none;
  appearance:none;
}
.search-dock__input::placeholder{color:#6E8880;}
.search-dock__input:focus{outline:none;}
.search-dock__go{flex:0 0 auto;}
.search-dock__status{
  width:100%;
  max-width:var(--shell-max);
  margin:.4rem auto 0;
  padding-inline:var(--gutter);
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.6;
  letter-spacing:.03em;
  color:var(--cyan-soft);
}
.search-dock__status:empty{display:none;}

/* 右侧元信息 */
.brandbar__meta{
  grid-area:meta;
  display:flex;
  align-items:center;
  gap:.7rem;
  justify-self:end;
}
.brandbar__cta{font-size:13px;padding:.5rem .9rem;}
.version-chip{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  padding:.3rem .55rem;
  border:1px solid var(--line);
  background:rgba(23,63,56,.7);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--muted);
  clip-path:polygon(0 0,100% 0,100% calc(100% - var(--cut-sm)),calc(100% - var(--cut-sm)) 100%,0 100%);
}
.version-chip__dot{
  width:7px;
  height:7px;
  flex:0 0 auto;
  background:var(--amber);
  box-shadow:0 0 0 2px rgba(242,179,61,.16), 0 0 10px rgba(242,179,61,.55);
  animation:chip-breathe 4s ease-in-out infinite;
}
.version-chip__label{color:var(--muted);}
.version-chip__num{color:var(--amber);font-weight:700;}
@keyframes chip-breathe{
  0%,100%{opacity:.92;}
  50%{opacity:1;}
}

/* 移动端抽屉按钮 */
.nav-toggle{
  grid-area:toggle;
  display:none;
  align-items:center;
  gap:.5rem;
  padding:.5rem .7rem;
  border:1px solid var(--line);
  background:rgba(23,63,56,.8);
  color:var(--paper);
  font-size:13px;
  font-weight:700;
  letter-spacing:.08em;
  cursor:pointer;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);
}
.nav-toggle:hover{border-color:var(--cyan);}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:3px;width:16px;}
.nav-toggle__bars i{
  display:block;
  height:2px;
  width:100%;
  background:var(--cyan);
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(5px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg);}

/* 栏目条 */
.site-nav{
  position:relative;
  background:linear-gradient(90deg,rgba(18,48,42,.78),rgba(11,31,26,.5));
  border-bottom:1px solid var(--line);
}
.site-nav__list{
  display:flex;
  flex-wrap:wrap;
  align-items:stretch;
  gap:0 1.65rem;
}
.site-nav__list a{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:.5rem;
  padding:.85rem 0;
  color:var(--muted);
  font-size:15px;
  font-weight:500;
  letter-spacing:.03em;
  transition:color .18s var(--ease);
}
.site-nav__list a::after{
  content:"";
  position:absolute;
  left:0;
  bottom:.5rem;
  width:0;
  height:2px;
  background:var(--cyan);
  transition:width .2s var(--ease);
}
.site-nav__list a:hover{color:var(--paper);}
.site-nav__list a:hover::after{width:12px;}
.site-nav__list a[aria-current="page"]{color:var(--paper);font-weight:700;}
.site-nav__list a[aria-current="page"]::after{
  width:24px;
  box-shadow:0 0 10px rgba(43,232,200,.7);
}
.site-nav__num{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:#54736A;
  transition:color .18s var(--ease);
}
.site-nav__list a:hover .site-nav__num,
.site-nav__list a[aria-current="page"] .site-nav__num{color:var(--cyan);}

.nav-scrim{
  display:none;
  position:fixed;
  inset:0;
  z-index:70;
  padding:0;
  border:0;
  background:rgba(4,14,11,.68);
  cursor:pointer;
}
.site-header[data-nav-open="true"] .nav-scrim{display:block;}

/* ---------- 7. footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(3rem,7vw,6rem);
  background:linear-gradient(180deg,rgba(9,25,21,.94),#071613 72%);
  border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;
  left:var(--gutter);
  width:min(38%,320px);
  height:2px;
  background:linear-gradient(90deg,var(--cyan),transparent);
}
.footer-masthead{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:1rem 1.75rem;
  padding:clamp(2rem,5vw,3.2rem) 0 clamp(1.4rem,3vw,2rem);
}
.brand--footer .brand__mark{width:46px;height:46px;}
.footer-masthead__note{
  flex:1 1 260px;
  min-width:200px;
  max-width:44ch;
  font-size:14px;
  line-height:1.7;
  color:var(--muted);
}
.version-chip--footer{background:transparent;}
.footer-index{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(1.25rem,3vw,2.5rem);
  padding:clamp(1.6rem,3.5vw,2.6rem) 0;
}
.footer-col{min-width:0;}
.footer-col__title{
  position:relative;
  margin-bottom:.9rem;
  padding-top:.8rem;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.18em;
  color:var(--cyan);
  text-transform:uppercase;
}
.footer-col__title::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  width:26px;
  height:2px;
  background:var(--amber);
}
.footer-list{display:grid;gap:.1rem;}
.footer-list a{
  display:inline-block;
  padding:.28rem 0;
  border-bottom:1px solid transparent;
  color:var(--muted);
  font-size:15px;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer-list a:hover{color:var(--cyan-soft);border-color:var(--cyan);}
.footer-address{
  display:grid;
  gap:.5rem;
  font-size:14px;
  color:var(--muted);
}
.footer-address__row{
  display:grid;
  grid-template-columns:3.2em minmax(0,1fr);
  gap:.5rem;
  align-items:baseline;
}
.footer-address__key{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--muted);
  opacity:.72;
}
.footer-col__note{
  margin-top:.85rem;
  font-size:13px;
  line-height:1.7;
  color:var(--muted);
}
.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.55rem 1.5rem;
  padding:1.1rem 0 1.7rem;
  font-size:13px;
  color:var(--muted);
}
.footer-base__copy{font-size:13px;}
.footer-base__copy .mono{color:var(--paper);font-size:12px;}
.footer-base__note{font-size:13px;}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  gap:.35rem 1rem;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
}
.footer-legal a{color:var(--muted);border-bottom:1px solid var(--line);padding-bottom:.1rem;}
.footer-legal a:hover{color:var(--cyan-soft);border-color:var(--cyan);}

/* ---------- 8. page components ---------- */
.grid{display:grid;gap:clamp(1rem,2.5vw,1.75rem);}
.grid--3-9{grid-template-columns:minmax(0,3fr) minmax(0,9fr);}
.grid--4-8{grid-template-columns:minmax(0,4fr) minmax(0,8fr);}
.grid--cards{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));}
.grid--stagger > *:nth-child(even){transform:translateY(clamp(16px,3vw,32px));}

.panel{
  position:relative;
  padding:clamp(1rem,2.5vw,1.7rem);
  border:1px solid var(--line);
  background:linear-gradient(158deg,rgba(23,63,56,.95),rgba(18,48,42,.88));
  clip-path:polygon(0 0,calc(100% - var(--cut-lg)) 0,100% var(--cut-lg),100% 100%,var(--cut-lg) 100%,0 calc(100% - var(--cut-lg)));
  transition:border-color .18s var(--ease),background .18s var(--ease);
}
.panel::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  width:20px;
  height:2px;
  background:var(--cyan);
  opacity:.85;
}
.panel:hover{border-color:rgba(43,232,200,.5);}
.panel--flat{background:rgba(18,48,42,.62);}
.panel--flat::before{background:var(--amber);}

.band{
  position:relative;
  padding:clamp(1.2rem,3vw,2rem) 0;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  background:linear-gradient(90deg,rgba(18,48,42,.92),rgba(23,63,56,.55));
  overflow:hidden;
}
.band::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:repeating-linear-gradient(-45deg,rgba(43,232,200,.055) 0 1px,transparent 1px 12px);
}
.band > *{position:relative;}

.prose{
  max-width:36em;
  font-size:17px;
  line-height:1.75;
  color:var(--paper);
}
.prose > * + *{margin-top:1.2em;}
.prose h2{font-size:clamp(22px,2.6vw,28px);margin-top:1.9em;}
.prose h3{font-size:clamp(18px,2.2vw,22px);margin-top:1.6em;}
.prose h2 + *,.prose h3 + *{margin-top:.7em;}
.prose ul,.prose ol{padding-left:1.35em;color:var(--paper);}
.prose ul{list-style:disc;}
.prose ol{list-style:decimal;}
.prose li + li{margin-top:.4em;}
.prose li::marker{color:var(--cyan);}
.prose a{color:var(--cyan);border-bottom:1px solid var(--line);}
.prose a:hover{color:var(--cyan-soft);border-color:var(--cyan);}
.prose strong{color:var(--paper);font-weight:700;}
.prose blockquote{
  margin:1.4em 0;
  padding:.9em 1.1em;
  border-left:2px solid var(--amber);
  background:rgba(23,63,56,.5);
  color:var(--muted);
}

.crumbs{font-family:var(--font-mono);font-size:12px;letter-spacing:.05em;color:var(--muted);}
.crumbs ol{display:flex;flex-wrap:wrap;gap:.3rem;align-items:center;}
.crumbs li{display:inline-flex;align-items:center;gap:.3rem;}
.crumbs li::after{content:"/";color:var(--line);}
.crumbs li:last-child::after{content:"";}
.crumbs a{color:var(--muted);border-bottom:1px solid var(--line);padding-bottom:.05rem;}
.crumbs a:hover{color:var(--cyan-soft);border-color:var(--cyan);}
.crumbs [aria-current="page"]{color:var(--paper);}

.step-index{border-left:1px solid var(--line);}
.step-index__link{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:.65rem;
  align-items:baseline;
  margin-left:-1px;
  padding:.62rem .8rem;
  border-left:2px solid transparent;
  color:var(--muted);
  font-size:15px;
  transition:color .18s var(--ease),border-color .18s var(--ease),background .18s var(--ease);
}
.step-index__link:hover{color:var(--paper);background:rgba(43,232,200,.06);}
.step-index__link[aria-current="true"]{
  color:var(--paper);
  border-left-color:var(--cyan);
  background:linear-gradient(90deg,rgba(43,232,200,.14),transparent 85%);
}
.step-index__num{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:#54736A;
}
.step-index__link[aria-current="true"] .step-index__num{color:var(--amber);}
.step-index__label{font-weight:500;}

.fig-frame{
  position:relative;
  display:block;
  width:100%;
  margin:0;
  aspect-ratio:16 / 10;
  border:1px solid var(--line);
  background:linear-gradient(150deg,#12302A,#091B17 85%);
  overflow:hidden;
  clip-path:polygon(0 0,calc(100% - var(--cut-lg)) 0,100% var(--cut-lg),100% 100%,0 100%);
}
.fig-frame--wide{aspect-ratio:21 / 9;}
.fig-frame--tall{aspect-ratio:4 / 5;}
.fig-frame img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.92);
}
.fig-frame__slot{
  display:grid;
  place-items:center;
  height:100%;
  padding:1rem;
  text-align:center;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--muted);
  background-image:repeating-linear-gradient(-45deg,rgba(43,232,200,.07) 0 1px,transparent 1px 10px);
}
.fig-frame__cap{
  margin-top:.6rem;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.05em;
  color:var(--muted);
}

.tag{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  padding:.16rem .5rem;
  border:1px solid var(--line);
  background:rgba(23,63,56,.65);
  color:var(--cyan-soft);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 6px),calc(100% - 6px) 100%,0 100%);
}
.tag--amber{color:var(--amber);border-color:rgba(242,179,61,.42);background:rgba(242,179,61,.1);}
.status-dot{
  display:inline-block;
  width:6px;
  height:6px;
  flex:0 0 auto;
  background:var(--amber);
  box-shadow:0 0 8px rgba(242,179,61,.7);
}
.status-dot--coral{background:var(--coral);box-shadow:0 0 8px rgba(217,85,63,.7);}

/* ---------- 9. responsive ---------- */
@media (max-width:1024px){
  :root{--shell-max:100%;}
  .site-nav__list{gap:0 1.2rem;}
}

@media (max-width:900px){
  .grid--3-9,.grid--4-8{grid-template-columns:minmax(0,1fr);}
  .footer-index{grid-template-columns:repeat(2,minmax(0,1fr));}
}

@media (max-width:860px){
  .brandbar{padding:.7rem 0 .8rem;}
  .brandbar__inner{
    grid-template-columns:minmax(0,1fr) auto;
    grid-template-areas:
      "brand toggle"
      "search search"
      "meta meta";
    gap:.65rem 1rem;
  }
  .nav-toggle{display:inline-flex;justify-self:end;}
  .search-dock{max-width:none;justify-self:stretch;}
  .brandbar__meta{justify-self:stretch;justify-content:space-between;}
  .brand__name{font-size:16px;}

  .site-nav{
    position:fixed;
    left:0;
    right:0;
    bottom:0;
    z-index:80;
    max-height:76vh;
    overflow-y:auto;
    padding:.3rem 0 calc(.9rem + env(safe-area-inset-bottom));
    border-top:1px solid var(--cyan);
    border-bottom:0;
    background:linear-gradient(180deg,#0F2C25 0%,#091A16 100%);
    box-shadow:0 -22px 48px rgba(0,0,0,.55);
    transform:translateY(102%);
    visibility:hidden;
    transition:transform .24s var(--ease),visibility .24s var(--ease);
  }
  .site-nav[data-open="true"]{transform:translateY(0);visibility:visible;}
  .site-nav__list{flex-direction:column;gap:0;}
  .site-nav__list li{border-bottom:1px solid rgba(42,74,67,.55);}
  .site-nav__list li:last-child{border-bottom:0;}
  .site-nav__list a{width:100%;padding:.9rem 0;font-size:16px;}
  .site-nav__list a::after{bottom:.6rem;}
}

@media (max-width:700px){
  .grid--stagger > *:nth-child(even){transform:none;}
}

@media (max-width:560px){
  .footer-index{grid-template-columns:minmax(0,1fr);}
  .footer-base{flex-direction:column;align-items:flex-start;}
  .brand__tag{display:none;}
}

@media (max-width:520px){
  .search-dock{flex-wrap:wrap;}
  .search-dock__field{flex:1 1 100%;}
  .search-dock__go{flex:1 1 auto;}
  .footer-masthead{gap:.9rem;}
}

/* ---------- 10. motion ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .scroll-meter__bar{transition:none;}
  .version-chip__dot{animation:none;opacity:1;}
}