:root{
  --ink:#0A1730;
  --ink-2:#12233F;
  --ink-3:#1B3A63;
  --gold:#C8A45C;
  --gold-hi:#F2D89A;
  --cyan:#35E0D6;
  --magenta:#E5488F;
  --paper:#E9F1F7;
  --muted:#93A6C0;
  --warn:#FF8A4C;
  --line:rgba(147,166,192,.26);
  --line-strong:rgba(200,164,92,.42);
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-cond:"Helvetica Neue Condensed","Arial Narrow","Noto Sans SC","PingFang SC",system-ui,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"JetBrains Mono",Menlo,Consolas,"Courier New",monospace;
  --wrap:1280px;
  --head:64px;
  --rail:46px;
}

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

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:150px;
}

body{
  margin:0;
  min-height:100vh;
  font-family:var(--font-sans);
  font-size:17px;
  font-weight:400;
  line-height:1.75;
  color:var(--paper);
  background-color:var(--ink);
  background-image:
    radial-gradient(1100px 620px at 78% -12%,rgba(27,58,99,.62),transparent 68%),
    radial-gradient(760px 460px at -10% 24%,rgba(53,224,214,.07),transparent 70%),
    linear-gradient(rgba(147,166,192,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(147,166,192,.05) 1px,transparent 1px);
  background-size:auto,auto,64px 64px,64px 64px;
}

main{display:block}

h1,h2,h3,h4{
  margin:0;
  font-family:var(--font-cond);
  font-weight:700;
  line-height:1.2;
  letter-spacing:.04em;
  text-wrap:balance;
}
h1{font-size:clamp(30px,4.6vw,60px);color:var(--paper)}
h2{font-size:clamp(23px,3vw,36px);color:var(--paper)}
h3{font-size:clamp(17px,1.8vw,22px);color:var(--cyan)}
h4{font-size:16px;color:var(--gold-hi);letter-spacing:.08em}

p{margin:0;max-width:68ch}
p+p{margin-top:1em}

ul,ol{margin:0;padding:0;list-style:none}
img{display:block;max-width:100%;height:auto}
strong{color:var(--gold-hi);font-weight:700}
small{font-size:12px;color:var(--muted)}
hr{border:0}

a{color:var(--cyan);text-decoration:none;transition:color .18s ease-out}
a:hover{color:var(--gold-hi)}

button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}

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

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

.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.05em;
}

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

/* ---------- 布局 ---------- */
.wrap{
  width:min(100% - 48px,var(--wrap));
  margin-inline:auto;
}

.section{padding:96px 0}
.section--tight{padding:64px 0}

.stack{display:grid;gap:16px}

.grid{display:grid;gap:20px}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}

.split{
  display:grid;
  grid-template-columns:minmax(0,2fr) minmax(0,1fr);
  gap:40px;
  align-items:start;
}
.split--flip{grid-template-columns:minmax(0,1fr) minmax(0,2fr)}
.split__main,.split__aside{min-width:0}

.rule{height:1px;background:var(--line)}
.rule--strong{background:var(--line-strong)}

.lede{
  font-size:clamp(16px,1.4vw,19px);
  line-height:1.8;
  color:#CFDCEA;
}

.sec-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:8px 18px;
  padding-bottom:14px;
  margin-bottom:28px;
  border-bottom:1px solid var(--line);
}
.sec-head__kicker{
  font-size:11px;
  letter-spacing:.26em;
  color:var(--gold);
  text-transform:uppercase;
}
.sec-head__title{font-size:clamp(21px,2.4vw,30px);letter-spacing:.04em}
.sec-head__meta{
  margin-left:auto;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.05em;
  color:var(--muted);
}

/* ---------- 面包屑 ---------- */
.crumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding-top:26px;
  font-size:12px;
  letter-spacing:.1em;
  color:var(--muted);
}
.crumb a{color:var(--muted)}
.crumb a:hover{color:var(--cyan)}
.crumb__sep{color:var(--gold);opacity:.6}
.crumb [aria-current="page"]{color:var(--paper)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:9px 16px;
  font-size:13px;
  font-weight:600;
  letter-spacing:.08em;
  color:var(--paper);
  background:var(--ink-2);
  border:1px solid var(--line-strong);
  transition:background .18s ease-out,border-color .18s ease-out,color .18s ease-out;
}
.btn:hover,
.btn:focus-visible{background:var(--ink-3);border-color:var(--gold);color:var(--gold-hi)}
.btn--gold{
  color:#0A1730;
  background:linear-gradient(135deg,var(--gold) 0%,#A9863F 100%);
  border-color:transparent;
  font-weight:700;
}
.btn--gold:hover,
.btn--gold:focus-visible{
  color:#0A1730;
  background:linear-gradient(135deg,var(--gold-hi) 0%,var(--gold) 100%);
}
.btn--ghost{background:transparent;border-color:var(--line)}
.btn--ghost:hover{background:rgba(53,224,214,.08);border-color:var(--cyan);color:var(--cyan)}
.btn--sm{padding:6px 12px;font-size:12px}

/* ---------- 状态标签 ---------- */
.state-tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px 4px 8px;
  font-size:11px;
  font-weight:600;
  letter-spacing:.14em;
  white-space:nowrap;
  color:var(--cyan);
  background:rgba(53,224,214,.1);
  border:1px solid rgba(53,224,214,.34);
  border-left-width:3px;
}
.state-tag--live{animation:breathe 3.6s ease-in-out infinite}
.state-tag--new{color:var(--magenta);background:rgba(229,72,143,.1);border-color:rgba(229,72,143,.38)}
.state-tag--warn{color:var(--warn);background:rgba(255,138,76,.1);border-color:rgba(255,138,76,.36)}
.state-tag--mute{color:var(--muted);background:rgba(147,166,192,.1);border-color:rgba(147,166,192,.3)}

@keyframes breathe{
  0%,100%{opacity:1}
  50%{opacity:.62}
}

/* ---------- 面板 ---------- */
.panel{
  padding:22px 24px;
  background:var(--ink-2);
  border:1px solid var(--line);
  border-left:3px solid var(--cyan);
}
.panel--gold{border-left-color:var(--gold)}
.panel--magenta{border-left-color:var(--magenta)}
.panel--flat{border-left-width:1px}
.panel__head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:6px 14px;
  margin-bottom:10px;
}
.panel__title{font-size:17px;letter-spacing:.04em;color:var(--cyan)}
.panel--gold .panel__title{color:var(--gold-hi)}
.panel--magenta .panel__title{color:var(--magenta)}
.panel__meta{font-family:var(--font-mono);font-size:12px;letter-spacing:.05em;color:var(--muted)}
.panel__body{font-size:15px;line-height:1.8;color:#CFDCEA}
.panel__body p{max-width:60ch}

/* ---------- 图片容器 ---------- */
.fig-frame{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:16/9;
  background:
    linear-gradient(150deg,#12233F 0%,#0A1730 58%,#1B3A63 100%);
  border:1px solid var(--line);
}
.fig-frame::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(rgba(147,166,192,.08) 1px,transparent 1px),
    linear-gradient(90deg,rgba(147,166,192,.08) 1px,transparent 1px);
  background-size:40px 40px;
  pointer-events:none;
}
.fig-frame::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,transparent 46%,rgba(10,23,48,.75) 100%);
  pointer-events:none;
}
.fig-frame>img{width:100%;height:100%;object-fit:cover}
.fig-frame--wide{aspect-ratio:21/9}
.fig-frame--tall{aspect-ratio:4/5}
.fig-frame--square{aspect-ratio:1/1}
.fig-frame__cap{
  position:absolute;
  left:0;
  bottom:0;
  z-index:2;
  padding:9px 14px;
  font-size:12px;
  letter-spacing:.1em;
  color:var(--paper);
  background:rgba(10,23,48,.72);
  border-left:3px solid var(--gold);
}

/* ---------- 页内目录 / 显现 / 进度 ---------- */
.toc{display:grid;gap:2px}
.toc__link{
  display:block;
  padding:8px 12px;
  font-size:13px;
  color:var(--muted);
  border-left:2px solid var(--line);
  transition:color .18s ease-out,background .18s ease-out,border-color .18s ease-out;
}
.toc__link:hover{color:var(--paper);background:rgba(18,35,63,.75)}
.toc__link[aria-current="true"]{
  color:var(--gold-hi);
  background:rgba(200,164,92,.1);
  border-left-color:var(--gold);
}

.reveal{opacity:0;transform:translateY(12px)}
.reveal.is-in{
  opacity:1;
  transform:none;
  transition:opacity .24s ease-out,transform .24s ease-out;
}

.read-progress{
  position:fixed;
  top:0;
  left:0;
  z-index:120;
  width:0;
  height:2px;
  pointer-events:none;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--gold-hi) 55%,var(--magenta) 100%);
}

/* ---------- 跳过链接 ---------- */
.skip-link{
  position:absolute;
  top:-64px;
  left:12px;
  z-index:200;
  padding:10px 16px;
  font-size:13px;
  font-weight:700;
  letter-spacing:.08em;
  color:#0A1730;
  background:var(--gold-hi);
  border:1px solid var(--gold);
  transition:top .18s ease-out;
}
.skip-link:focus{top:12px;color:#0A1730}

/* ---------- 页头 ---------- */
.cmd-bar{
  position:sticky;
  top:0;
  z-index:90;
  background:rgba(10,23,48,.95);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(10px);
}

.cmd-top{position:relative}

.cmd-top__inner{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;
  gap:28px;
  min-height:var(--head);
  transition:min-height .2s ease-out;
}
.cmd-bar[data-scrolled] .cmd-top__inner{min-height:54px}

.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  padding:6px 0;
  color:var(--paper);
}
.brand:hover{color:var(--paper)}
.brand-mark{
  display:grid;
  place-items:center;
  width:34px;
  height:34px;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.06em;
  color:var(--gold-hi);
  border:1px solid var(--gold);
  background:rgba(200,164,92,.1);
}
.brand-text{display:flex;flex-direction:column;line-height:1.2}
.brand-name{font-size:15px;font-weight:700;letter-spacing:.08em}
.brand-sub{font-size:10px;letter-spacing:.28em;color:var(--gold)}

.cmd-index{display:flex;justify-content:center;min-width:0}
.cmd-index__list{display:flex;align-items:stretch;gap:2px}
.idx-link{
  display:inline-flex;
  align-items:baseline;
  gap:6px;
  padding:8px 12px;
  font-size:14px;
  color:var(--muted);
  border-bottom:2px solid transparent;
  transition:color .18s ease-out,background .18s ease-out,border-color .18s ease-out;
}
.idx-link:hover{color:var(--paper);background:var(--ink-2)}
.idx-link[aria-current="page"]{
  color:var(--gold-hi);
  border-bottom-color:var(--gold);
  background:linear-gradient(180deg,rgba(200,164,92,.14),transparent);
}
.idx-num{font-size:10px;letter-spacing:.08em;color:var(--cyan);opacity:.75}

.cmd-side{display:flex;align-items:center;gap:14px}
.night-state{
  display:inline-flex;
  align-items:center;
  gap:7px;
  max-width:none;
  font-size:12px;
  letter-spacing:.1em;
  color:var(--muted);
  white-space:nowrap;
}
.night-dot{
  width:7px;
  height:7px;
  flex:none;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(53,224,214,.16);
  animation:breathe 3.6s ease-in-out infinite;
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:8px 12px;
  font-size:12px;
  letter-spacing:.14em;
  color:var(--paper);
  border:1px solid var(--line-strong);
  transition:border-color .18s ease-out,color .18s ease-out;
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__bars{display:grid;gap:3px}
.nav-toggle__bars i{
  display:block;
  width:16px;
  height:1px;
  background:var(--cyan);
  transition:transform .18s ease-out,opacity .18s ease-out;
}
.cmd-bar[data-open] .nav-toggle__bars i:nth-child(1){transform:translateY(4px) rotate(45deg)}
.cmd-bar[data-open] .nav-toggle__bars i:nth-child(2){opacity:0}
.cmd-bar[data-open] .nav-toggle__bars i:nth-child(3){transform:translateY(-4px) rotate(-45deg)}

.ver-rail{
  border-top:1px solid rgba(147,166,192,.18);
  background:linear-gradient(90deg,rgba(27,58,99,.92) 0%,rgba(18,35,63,.88) 46%,rgba(10,23,48,.92) 100%);
}
.ver-rail__inner{
  display:flex;
  align-items:center;
  gap:26px;
  min-height:var(--rail);
  overflow-x:auto;
  scrollbar-width:none;
}
.ver-rail__inner::-webkit-scrollbar{display:none}
.ver-rail__lead{
  flex:none;
  padding-left:11px;
  font-size:11px;
  letter-spacing:.24em;
  color:var(--gold);
  white-space:nowrap;
  border-left:3px solid var(--gold);
}
.ver-cell{display:inline-flex;align-items:baseline;gap:8px;white-space:nowrap}
.ver-cell__key{font-size:11px;letter-spacing:.16em;color:var(--muted)}
.ver-cell__val{font-size:14px;color:var(--paper)}

.rail-meter{
  position:relative;
  flex:none;
  width:120px;
  height:4px;
  margin-left:auto;
  overflow:hidden;
  background:rgba(147,166,192,.18);
}
.rail-meter__fill{
  position:absolute;
  inset:0 38% 0 0;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--gold-hi) 100%);
}

/* ---------- 页脚 ---------- */
.site-foot{
  margin-top:96px;
  border-top:1px solid var(--line-strong);
  background:linear-gradient(180deg,rgba(18,35,63,.62) 0%,rgba(10,23,48,.98) 42%);
}
.foot-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1fr;
  gap:40px 32px;
  padding:64px 0 48px;
}
.foot-col{min-width:0}
.foot-brand{
  font-family:var(--font-cond);
  font-size:22px;
  font-weight:700;
  letter-spacing:.1em;
  color:var(--gold-hi);
}
.foot-note{
  margin-top:12px;
  max-width:34ch;
  font-size:14px;
  line-height:1.8;
  color:var(--muted);
}
.foot-state{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-top:18px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--cyan);
}
.foot-col__title{
  padding-bottom:10px;
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:600;
  letter-spacing:.22em;
  color:var(--gold);
  border-bottom:1px solid var(--line);
}
.foot-list{display:grid;gap:9px}
.foot-link{
  position:relative;
  display:inline-block;
  padding-left:16px;
  font-size:14px;
  color:var(--muted);
  transition:color .18s ease-out;
}
.foot-link::before{
  content:"";
  position:absolute;
  left:0;
  top:.78em;
  width:8px;
  height:1px;
  background:var(--cyan);
  opacity:.6;
  transition:width .18s ease-out,background .18s ease-out,opacity .18s ease-out;
}
.foot-link:hover{color:var(--paper)}
.foot-link:hover::before{width:12px;background:var(--gold-hi);opacity:1}

.foot-bar{
  border-top:1px solid var(--line);
  background:rgba(10,23,48,.85);
}
.foot-bar__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 24px;
  padding:18px 0 28px;
}
.foot-meta{
  display:inline-flex;
  align-items:center;
  gap:8px;
  max-width:none;
  font-size:12px;
  letter-spacing:.06em;
  color:var(--muted);
}
.foot-meta .mono{color:var(--paper);font-size:12px}

.copy-btn{
  padding:2px 8px;
  font-size:11px;
  letter-spacing:.12em;
  color:var(--cyan);
  border:1px solid var(--line);
  transition:border-color .18s ease-out,background .18s ease-out,color .18s ease-out;
}
.copy-btn:hover{border-color:var(--cyan);background:rgba(53,224,214,.1)}
.copy-btn[data-copied]{color:var(--gold-hi);border-color:var(--gold)}

/* ---------- 平板 ---------- */
@media (max-width:1080px){
  .cmd-top__inner{
    grid-template-columns:auto auto;
    justify-content:space-between;
    gap:16px;
  }
  .nav-toggle{display:inline-flex}
  .night-state{display:none}

  .cmd-index{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    display:none;
    justify-content:flex-start;
    background:rgba(10,23,48,.98);
    border-top:1px solid var(--line);
    border-bottom:1px solid var(--line-strong);
    box-shadow:0 18px 40px rgba(4,10,22,.6);
  }
  .cmd-bar[data-open] .cmd-index{display:block}
  .cmd-index__list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    width:min(100% - 48px,var(--wrap));
    margin-inline:auto;
    padding:6px 0;
  }
  .idx-link{
    padding:14px 14px 14px 16px;
    font-size:15px;
    border-bottom:1px solid var(--line);
    border-left:3px solid transparent;
  }
  .idx-link[aria-current="page"]{
    background:rgba(200,164,92,.1);
    border-bottom-color:var(--line);
    border-left-color:var(--gold);
  }

  .split,
  .split--flip{grid-template-columns:minmax(0,1fr);gap:32px}

  .foot-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}

/* ---------- 手机 ---------- */
@media (max-width:640px){
  body{font-size:16px;line-height:1.75}
  .wrap{width:min(100% - 32px,var(--wrap))}
  .section{padding:64px 0}
  .section--tight{padding:44px 0}

  :root{--head:58px;--rail:42px}

  .brand-mark{width:30px;height:30px;font-size:12px}
  .brand-name{font-size:14px;letter-spacing:.06em}
  .brand-sub{font-size:9px;letter-spacing:.22em}

  .btn{padding:8px 12px;font-size:12px}
  .cmd-bar .btn--gold{display:none}

  .ver-rail__inner{gap:18px}
  .ver-rail__lead{font-size:10px;letter-spacing:.18em}
  .rail-meter{display:none}

  .grid--2,
  .grid--3{grid-template-columns:minmax(0,1fr)}

  .panel{padding:18px 18px}
  .sec-head__meta{margin-left:0;width:100%}

  .foot-grid{grid-template-columns:minmax(0,1fr);gap:32px;padding:48px 0 36px}
  .foot-brand{font-size:19px}
  .foot-bar__inner{gap:10px 16px;padding:16px 0 26px}
}

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