@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

:root{
  --ink:#171f26;
  --ink-a:#1c2631;
  --ink-b:#131a20;
  --sky:#c8e0f4;
  --rose:#f5e0e8;
  --txt:#dbe6ee;
  --dim:#94a8b7;
  --up:rgba(200,224,244,.10);
  --dn:rgba(0,0,0,.62);
  --line:rgba(200,224,244,.16);
  --mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
  --sans:'IBM Plex Sans',system-ui,-apple-system,'Segoe UI',sans-serif;
  --r:14px;
  --pad:clamp(16px,4vw,40px);
}

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

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

body{
  margin:0;
  font-family:var(--sans);
  font-size:17px;
  line-height:1.68;
  color:var(--txt);
  background:
    radial-gradient(1200px 620px at 92% -12%,rgba(200,224,244,.08),transparent 62%),
    radial-gradient(900px 520px at 6% 108%,rgba(245,224,232,.07),transparent 62%),
    var(--ink);
  background-attachment:fixed;
}

img{max-width:100%;height:auto;display:block}

a{color:var(--sky);text-decoration:none}

h1,h2,h3,h4{
  font-family:var(--mono);
  font-weight:600;
  line-height:1.28;
  letter-spacing:-.01em;
  margin:0 0 12px;
  color:#eef4f9;
}

h2{font-size:clamp(20px,2.6vw,26px)}
h3{font-size:19px}

hr{
  border:0;
  height:2px;
  margin:12px 0 20px;
  background:linear-gradient(90deg,rgba(200,224,244,.42),rgba(245,224,232,.16),transparent);
}

p{margin:0 0 14px}
p:last-child{margin-bottom:0}

/* ---------- 顶栏 ---------- */
.mast{position:relative}

.tb{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:12px;
  padding:12px var(--pad);
  border-bottom:1px solid rgba(200,224,244,.08);
  background:linear-gradient(180deg,rgba(28,38,49,.9),rgba(23,31,38,.72));
}

.tb-l{display:flex;align-items:center;gap:8px;position:relative}
.tb-r{display:flex;justify-content:flex-end;gap:2px}
.tb-c{display:flex;justify-content:center}

.icon-btn{
  font-family:var(--mono);
  font-size:14px;
  color:var(--txt);
  background:linear-gradient(145deg,var(--ink-a),var(--ink-b));
  border:0;
  border-radius:12px;
  box-shadow:-4px -4px 10px var(--up),4px 4px 10px var(--dn);
  padding:11px 14px;
  min-height:44px;
  cursor:pointer;
  transition:transform .15s ease,box-shadow .15s ease;
}

.icon-btn:active{
  transform:scale(.96);
  box-shadow:inset -3px -3px 8px var(--up),inset 3px 3px 8px var(--dn);
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:4px 10px;
  color:#f2f7fb;
}

.brand-t{
  font-family:var(--mono);
  font-size:17px;
  font-weight:600;
  letter-spacing:.04em;
}

.mark{
  width:32px;
  height:32px;
  border-radius:10px;
  box-shadow:-3px -3px 8px var(--up),3px 3px 8px var(--dn);
  object-fit:cover;
}

.mark-dot{
  width:30px;
  height:30px;
  border-radius:10px;
  background:linear-gradient(145deg,var(--sky),var(--rose));
  box-shadow:-3px -3px 8px var(--up),3px 3px 8px var(--dn);
}

.top-a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:10px 12px;
  font-family:var(--mono);
  font-size:14px;
  color:var(--dim);
  border-radius:12px;
  transition:color .15s ease,box-shadow .15s ease,transform .15s ease;
}

.top-a:hover{
  color:var(--sky);
  box-shadow:-4px -4px 10px var(--up),4px 4px 10px var(--dn);
}

.top-a:active{transform:scale(.97)}

/* 搜索 */
.sf{position:relative;display:flex;align-items:center}

.sf-in{
  font-family:var(--mono);
  font-size:14px;
  color:var(--txt);
  width:196px;
  min-height:44px;
  padding:11px 14px;
  border:0;
  border-radius:12px;
  background:var(--ink-b);
  box-shadow:inset -3px -3px 8px var(--up),inset 3px 3px 8px var(--dn);
  outline:none;
}

.sf-in::placeholder{color:#7b8f9e}
.sf-in:focus{box-shadow:inset -3px -3px 8px var(--up),inset 3px 3px 8px var(--dn),0 0 0 2px rgba(200,224,244,.28)}

.sf-hits{
  position:absolute;
  top:calc(100% + 8px);
  left:0;
  width:250px;
  z-index:60;
  display:none;
  background:rgba(28,38,49,.96);
  backdrop-filter:blur(12px);
  border-radius:12px;
  box-shadow:-6px -6px 16px var(--up),6px 6px 16px var(--dn);
  padding:6px;
}

.sf.on .sf-hits{display:block}
.sf-hits ul{list-style:none;margin:0;padding:0}

.hit-a{
  display:flex;
  align-items:center;
  min-height:42px;
  padding:9px 12px;
  border-radius:8px;
  font-size:15px;
  color:var(--txt);
}

.hit-a:hover{background:rgba(200,224,244,.10);color:var(--sky)}
.sf-hits li.off{display:none}

/* ---------- 粘性锚点条 ---------- */
.rail{
  position:sticky;
  top:0;
  z-index:40;
  background:rgba(23,31,38,.9);
  backdrop-filter:blur(14px);
  border-bottom:1px solid rgba(200,224,244,.1);
  box-shadow:0 6px 18px rgba(0,0,0,.42);
}

.rail-in{
  display:flex;
  gap:4px;
  padding:8px var(--pad);
  overflow-x:auto;
  scrollbar-width:none;
}

.rail-in::-webkit-scrollbar{display:none}

.rail-a{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:10px 14px;
  font-family:var(--mono);
  font-size:14px;
  color:var(--dim);
  border-radius:12px;
  white-space:nowrap;
  transition:color .15s ease,transform .15s ease,box-shadow .15s ease;
}

.rail-a:hover{
  color:var(--sky);
  box-shadow:-4px -4px 10px var(--up),4px 4px 10px var(--dn);
}

.rail-a:active{transform:scale(.96)}

/* ---------- Hero ---------- */
.hero{
  position:relative;
  min-height:45vh;
  display:flex;
  flex-direction:column;
  justify-content:center;
  align-items:flex-end;
  text-align:right;
  gap:20px;
  padding:clamp(26px,5vw,52px) var(--pad) clamp(26px,5vw,46px);
  overflow:hidden;
  background-image:
    radial-gradient(rgba(200,224,244,.16) 1px,transparent 1px),
    radial-gradient(rgba(245,224,232,.10) 1px,transparent 1px);
  background-size:22px 22px,22px 22px;
  background-position:0 0,11px 11px;
}

.hero::after{
  content:'';
  position:absolute;
  inset:auto -10% -40% 40%;
  height:70%;
  background:radial-gradient(closest-side,rgba(200,224,244,.14),transparent 78%);
  pointer-events:none;
}

.hero-t{position:relative;max-width:34ch}

.hero-h{
  font-size:clamp(25px,5.2vw,42px);
  margin:0 0 10px;
  text-shadow:0 2px 18px rgba(0,0,0,.5);
}

.hero-p{
  margin:0;
  color:var(--dim);
  font-size:16px;
  max-width:36ch;
  margin-left:auto;
}

.hero-f{position:relative;margin:0;width:min(540px,100%)}

.hero-img{
  width:100%;
  max-height:26vh;
  object-fit:cover;
  border-radius:4px;
  box-shadow:-5px -5px 15px var(--up),5px 5px 15px var(--dn);
}

/* ---------- 主区 ---------- */
.layout{
  display:grid;
  grid-template-columns:minmax(0,1fr) 292px;
  gap:clamp(20px,3vw,40px);
  padding:clamp(24px,4vw,44px) var(--pad) clamp(40px,6vw,64px);
  align-items:start;
}

.doc{min-width:0}

.doc-body > article{
  position:relative;
  margin:0 0 26px;
  padding:clamp(18px,3vw,30px);
  border-radius:var(--r);
  background:linear-gradient(145deg,#1d2731,#141b22);
  box-shadow:-5px -5px 15px var(--up),5px 5px 15px var(--dn);
  scroll-margin-top:86px;
}

.doc-body > article:nth-of-type(even){
  background:linear-gradient(145deg,#1a232c,#121920);
  box-shadow:-5px -5px 15px rgba(245,224,232,.07),5px 5px 15px var(--dn);
}

.doc-body > article:last-child{margin-bottom:0}

.doc-body ul,.doc-body ol{padding-left:22px;margin:0 0 14px}
.doc-body li{margin:0 0 8px}

.doc-body strong{color:#fff;font-weight:600}
.doc-body a{color:var(--rose);text-decoration:underline;text-underline-offset:3px}

.doc-body blockquote{
  margin:0 0 14px;
  padding:14px 18px;
  border-radius:10px;
  background:rgba(245,224,232,.05);
  box-shadow:inset -3px -3px 8px var(--up),inset 3px 3px 8px var(--dn);
  color:#e8eef4;
}

.doc-body table{width:100%;border-collapse:collapse;font-size:16px}
.doc-body th,.doc-body td{padding:9px 10px;border-bottom:1px solid var(--line);text-align:left}

/* ---------- 侧栏 ---------- */
.side{
  position:sticky;
  top:78px;
  padding:18px 16px;
  border-radius:var(--r);
  background:rgba(200,224,244,.045);
  backdrop-filter:blur(10px);
  box-shadow:-5px -5px 15px var(--up),5px 5px 15px var(--dn);
}

.side-h{
  font-size:15px;
  letter-spacing:.14em;
  margin:0 0 8px;
  color:var(--sky);
}

.side-hr{margin:0 0 12px}

.side-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:6px}

.side-a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:10px 12px;
  border-radius:4px;
  font-size:15px;
  color:var(--txt);
  border-left:2px solid rgba(200,224,244,.22);
  transition:background .16s ease,border-color .16s ease,color .16s ease;
}

.side-a:hover{
  background:rgba(245,224,232,.07);
  border-left-color:var(--rose);
  color:var(--rose);
}

/* ---------- 页脚 ---------- */
.foot{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:14px 22px;
  padding:22px var(--pad) 26px;
  border-top:1px solid rgba(200,224,244,.1);
  background:linear-gradient(180deg,rgba(19,26,32,.4),rgba(19,26,32,.9));
}

.f-brand{display:flex;align-items:center;gap:9px}

.f-mark{
  width:22px;
  height:22px;
  border-radius:7px;
  background:linear-gradient(145deg,var(--sky),var(--rose));
  box-shadow:-3px -3px 8px var(--up),3px 3px 8px var(--dn);
}

.f-name{
  font-family:var(--mono);
  font-size:15px;
  letter-spacing:.05em;
  color:#eaf2f8;
}

.f-nav{min-width:0}
.f-dl{margin:0;display:flex;flex-wrap:wrap;align-items:center;gap:2px}

.f-dl dt{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.16em;
  color:#7d90a0;
  margin-right:8px;
}

.f-dl dd{margin:0}

.foot-a{
  display:inline-flex;
  align-items:center;
  min-height:42px;
  padding:9px 9px;
  font-size:14px;
  color:var(--dim);
  border-radius:8px;
}

.foot-a:hover{color:var(--sky);background:rgba(200,224,244,.07)}

.f-copy{
  font-family:var(--mono);
  font-size:13px;
  color:#76899a;
}

/* ---------- 全屏菜单 ---------- */
.veil{
  position:fixed;
  inset:0;
  z-index:90;
  display:grid;
  grid-template-rows:auto 1fr;
  gap:18px;
  padding:16px var(--pad) 32px;
  background:rgba(19,26,32,.97);
  backdrop-filter:blur(16px);
  transform:translateY(-102%);
  visibility:hidden;
  transition:transform .35s ease,visibility .35s ease;
}

.veil.on{transform:none;visibility:visible}

.veil-top{display:flex;align-items:center;justify-content:space-between;gap:12px}

.veil-t{font-family:var(--mono);font-size:16px;letter-spacing:.05em;color:#eef4f9}

.veil-nav{
  display:flex;
  flex-direction:column;
  gap:6px;
  overflow-y:auto;
  align-self:start;
  padding-top:6px;
}

.veil-a{
  display:flex;
  align-items:center;
  min-height:56px;
  padding:14px 16px;
  border-radius:12px;
  font-family:var(--mono);
  font-size:17px;
  color:var(--txt);
  box-shadow:-4px -4px 12px var(--up),4px 4px 12px var(--dn);
  transition:color .15s ease,transform .15s ease;
}

.veil-a:hover{color:var(--sky)}
.veil-a:active{transform:scale(.985)}

/* ---------- 回到顶部 ---------- */
.totop{
  position:fixed;
  right:14px;
  bottom:14px;
  z-index:35;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:10px 14px;
  border-radius:12px;
  font-family:var(--mono);
  font-size:13px;
  color:var(--dim);
  background:linear-gradient(145deg,var(--ink-a),var(--ink-b));
  box-shadow:-4px -4px 12px var(--up),4px 4px 12px var(--dn);
}

.totop:hover{color:var(--sky)}

/* ---------- 滚动显现 ---------- */
.js .rv{opacity:0;transform:translateY(14px);transition:opacity .5s ease,transform .5s ease}

.js .rv.in{opacity:1;transform:none}

/* ---------- 断点 ---------- */
@media (max-width:960px){
  .layout{grid-template-columns:minmax(0,1fr)}
  .side{position:static;order:2}
  .tb-r{display:none}
  .tb{grid-template-columns:auto 1fr auto}
  .sf-toggle{display:inline-flex}
}

@media (min-width:961px){
  .sf-toggle{display:none}
}

@media (max-width:960px){
  .sf{
    position:absolute;
    top:calc(100% + 10px);
    left:0;
    right:0;
    display:none;
    padding:10px;
    border-radius:var(--r);
    background:rgba(19,26,32,.98);
    box-shadow:-5px -5px 15px var(--up),5px 5px 15px var(--dn);
    z-index:70;
  }
  .sf.on{display:block}
  .sf-in{width:100%}
  .sf-hits{position:static;width:100%;margin-top:8px;box-shadow:none;background:transparent;padding:0}
  .sf.on .sf-hits{display:block}
}

@media (max-width:640px){
  body{font-size:16px}
  .hero{align-items:flex-end;min-height:44vh;padding-top:28px}
  .hero-f{width:100%}
  .hero-img{max-height:30vh}
  .brand-t{font-size:15px}
  .foot{justify-content:flex-start}
  .f-copy{width:100%}
  .totop{right:10px;bottom:10px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition-duration:.01ms !important;animation-duration:.01ms !important}
  .js .rv{opacity:1;transform:none}
  .veil{transition:none}
}

button[aria-expanded]{min-width:44px;min-height:44px}