@import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@300;400;500;600;700&family=Share+Tech+Mono&display=swap');

:root{
  --ink:#26171a;
  --rose:#eb879c;
  --blush:#ffb6c1;
  --text:#ffe9ee;
  --text-2:#ffd7de;
  --text-3:#ffc4cf;
  --line:rgba(255,182,193,.2);
  --line-2:rgba(255,182,193,.12);
  --glass:rgba(255,182,193,.065);
  --mono:'Fira Code','Share Tech Mono',ui-monospace,'SFMono-Regular',Menlo,Consolas,monospace;
  --sans:-apple-system,BlinkMacSystemFont,'PingFang SC','Hiragino Sans GB','Microsoft YaHei','Source Han Sans SC',sans-serif;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 18px 38px -22px rgba(235,135,156,.5);
  --ease:cubic-bezier(.22,.61,.36,1);
}

*{box-sizing:border-box}

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

body{
  margin:0;
  overflow-x:hidden;
  min-height:100vh;
  color:var(--text);
  background-color:var(--ink);
  background-image:
    radial-gradient(62vw 58vw at 84% -12%, rgba(235,135,156,.32), transparent 70%),
    radial-gradient(50vw 48vw at 6% 10%, rgba(255,182,193,.16), transparent 68%),
    radial-gradient(72vw 52vw at 46% 112%, rgba(235,135,156,.14), transparent 72%);
  background-attachment:fixed;
  font:400 16px/1.72 var(--sans);
  -webkit-font-smoothing:antialiased;
}

a{color:var(--blush);text-decoration:none}
a:hover{color:#fff}
:focus-visible{outline:3px solid var(--blush);outline-offset:3px}

p{margin:0 0 1em}
img{max-width:100%}
ul,ol{margin:0 0 1em}

/* ---------- 顶部玻璃导航 ---------- */
.masthead{
  position:sticky;
  top:0;
  z-index:40;
  padding:10px 14px 0;
}

.topbar{
  max-width:1180px;
  margin:0 auto;
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:10px;
  padding:7px 10px;
  border:1px solid var(--line);
  background:linear-gradient(180deg,rgba(38,23,26,.86),rgba(38,23,26,.6));
  -webkit-backdrop-filter:blur(16px) saturate(130%);
  backdrop-filter:blur(16px) saturate(130%);
  box-shadow:var(--shadow);
  transition:box-shadow .25s var(--ease),background .25s var(--ease);
}

.masthead.is-stuck .topbar{
  background:linear-gradient(180deg,rgba(38,23,26,.95),rgba(38,23,26,.78));
  box-shadow:0 2px 6px rgba(0,0,0,.5),0 26px 46px -24px rgba(235,135,156,.62);
}

.wing{min-width:0}
.wing ul{
  display:flex;
  flex-wrap:wrap;
  gap:2px;
  list-style:none;
  margin:0;
  padding:0;
}
.wing-r ul{justify-content:flex-end}

.wing a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:7px 9px;
  font:500 16px/1.5 var(--mono);
  letter-spacing:.02em;
  color:var(--text-2);
  border:1px solid transparent;
  transition:color .22s var(--ease),background .22s var(--ease),border-color .22s var(--ease);
}
.wing a::before{
  content:"";
  width:4px;
  height:4px;
  margin-right:6px;
  background:var(--rose);
  opacity:.6;
  transition:opacity .22s var(--ease),box-shadow .22s var(--ease);
}
.wing a:hover,
.wing a:focus-visible{
  color:#fff;
  background:rgba(235,135,156,.14);
  border-color:var(--line);
}
.wing a:hover::before{opacity:1;box-shadow:0 0 10px var(--rose)}

.brand{
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:40px;
  padding:6px 12px;
  border:1px solid var(--line);
  background:rgba(235,135,156,.12);
  color:#fff;
  font:600 16px/1.5 var(--mono);
  letter-spacing:.06em;
  white-space:nowrap;
  transition:background .22s var(--ease),box-shadow .22s var(--ease);
}
.brand:hover{background:rgba(235,135,156,.24);box-shadow:0 0 0 1px var(--line),0 14px 26px -18px var(--rose)}
.pip{
  width:8px;
  height:8px;
  background:var(--blush);
  box-shadow:0 0 12px var(--rose);
  flex:none;
}

/* ---------- 版面 ---------- */
.shell{
  max-width:1180px;
  margin:0 auto;
  padding:26px 18px 56px;
  display:grid;
  grid-template-columns:minmax(0,1fr) 286px;
  gap:26px;
  align-items:start;
}

.paper{
  position:relative;
  padding:clamp(18px,3vw,34px);
  border:1px solid var(--line);
  background:linear-gradient(180deg,rgba(255,182,193,.085),rgba(255,182,193,.03));
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  box-shadow:var(--shadow);
}

/* ---------- 首屏 ---------- */
.cover{
  position:relative;
  display:flex;
  flex-direction:column;
  justify-content:center;
  gap:14px;
  min-height:45vh;
  padding:6px 0 4px;
  overflow:hidden;
}

.ghost{
  position:absolute;
  left:-.05em;
  top:50%;
  transform:translateY(-56%);
  z-index:0;
  font:700 clamp(52px,12vw,140px)/0.86 var(--mono);
  letter-spacing:-.04em;
  color:rgba(255,182,193,.12);
  -webkit-text-stroke:1px rgba(235,135,156,.18);
  white-space:nowrap;
  pointer-events:none;
  user-select:none;
}

.cover-h1,
.lede,
.cover-fig{position:relative;z-index:1}

.cover-h1{
  margin:0;
  font-size:clamp(29px,5.2vw,52px);
  line-height:1.2;
  letter-spacing:-.01em;
  font-weight:700;
}

.lede{
  max-width:56ch;
  margin:0;
  color:var(--text-2);
  font-size:17px;
  line-height:1.66;
}

.cover-fig{
  margin:8px 0 0;
  border:1px solid var(--line);
  box-shadow:var(--shadow);
  overflow:hidden;
  background:rgba(38,23,26,.4);
}
.cover-fig img,
.cover-img{
  display:block;
  width:100%;
  height:auto;
  max-height:34vh;
  object-fit:cover;
}

/* ---------- 正文流 ---------- */
.stream{margin-top:32px}

.stream > article{
  padding:32px 0;
  border-top:1px solid var(--line-2);
  scroll-margin-top:120px;
}
.stream > article:first-child{border-top:0;padding-top:8px}

.stream h2{
  margin:0 0 .6em;
  font-size:clamp(22px,3.1vw,30px);
  line-height:1.34;
  font-weight:700;
  color:#fff;
}
.stream h2 span{
  position:relative;
  display:inline-block;
  padding-left:14px;
}
.stream h2 span::before{
  content:"";
  position:absolute;
  left:0;
  top:.18em;
  bottom:.18em;
  width:3px;
  background:linear-gradient(180deg,var(--blush),var(--rose));
}
.stream h3{
  margin:1.4em 0 .5em;
  font-size:19px;
  line-height:1.5;
  color:var(--text-2);
}
.stream h3 span{color:var(--rose)}
.stream p{max-width:68ch;color:var(--text)}
.stream ul,.stream ol{padding-left:1.25em;max-width:66ch}
.stream li{margin:0 0 .5em}
.stream a{border-bottom:1px solid rgba(255,182,193,.42);transition:border-color .22s var(--ease)}
.stream a:hover{border-bottom-color:var(--blush)}
.stream img{
  display:block;
  margin:1.1em 0;
  border:1px solid var(--line);
}
.stream blockquote{
  margin:1.2em 0;
  padding:2px 0 2px 16px;
  border-left:3px solid var(--rose);
  color:var(--text-2);
}
.stream code,
.stream pre{font-family:var(--mono);font-size:16px}
.stream pre{
  padding:14px;
  overflow-x:auto;
  border:1px solid var(--line);
  background:rgba(38,23,26,.55);
}
.stream table{width:100%;border-collapse:collapse;margin:1em 0}
.stream th,.stream td{
  padding:9px 10px;
  border-bottom:1px solid var(--line-2);
  text-align:left;
  font-size:16px;
}

/* ---------- 右侧栏 ---------- */
.side{
  position:sticky;
  top:100px;
  padding:16px 14px;
  border:1px solid var(--line);
  background:var(--glass);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  box-shadow:var(--shadow);
}

.side-h{
  margin:0 0 10px;
  font:600 16px/1.5 var(--mono);
  letter-spacing:.2em;
  color:var(--text-3);
}
.side-h span{display:inline-block;border-bottom:1px solid rgba(235,135,156,.45);padding-bottom:4px}

.side-nav ul{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:2px;
}
.side-nav a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:6px 9px;
  border-left:2px solid rgba(255,182,193,.24);
  color:var(--text-2);
  font-size:16px;
  line-height:1.5;
  transition:background .22s var(--ease),border-color .22s var(--ease),transform .22s var(--ease),color .22s var(--ease);
}
.side-nav a:hover,
.side-nav a:focus-visible{
  color:#fff;
  background:rgba(235,135,156,.14);
  border-left-color:var(--blush);
  transform:translateX(3px);
}

/* ---------- 页脚 ---------- */
.base{
  max-width:1180px;
  margin:0 auto 34px;
  padding:28px 18px 22px;
  border-top:1px solid var(--line);
}

.base-brand{
  margin:0 0 20px;
  font:700 clamp(38px,9.5vw,88px)/1 var(--mono);
  letter-spacing:-.045em;
  color:rgba(255,182,193,.9);
  overflow:hidden;
}
.base-brand span{
  display:block;
  background:linear-gradient(92deg,var(--blush),var(--rose) 70%,#ffd9e0);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  -webkit-text-fill-color:transparent;
}

.base-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr;
  gap:20px;
}

.foot-col{margin:0}
.foot-col dt{
  margin:0 0 8px;
  font:600 16px/1.5 var(--mono);
  letter-spacing:.2em;
  color:var(--rose);
}
.foot-col dd{
  margin:0;
  color:var(--text-2);
  font-size:16px;
  line-height:1.6;
}
.foot-col a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:2px 0;
  color:var(--text-2);
  border-bottom:1px solid transparent;
  transition:color .22s var(--ease),border-color .22s var(--ease);
}
.foot-col a:hover{color:#fff;border-bottom-color:var(--blush)}

.base-low{
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:12px;
  margin-top:22px;
  padding-top:14px;
  border-top:1px solid var(--line-2);
}
.copy{margin:0;color:var(--text-3);font:400 16px/1.6 var(--mono)}
.up{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:6px 14px;
  border:1px solid var(--line);
  background:var(--glass);
  color:var(--text-2);
  font:500 16px/1.5 var(--mono);
  transition:background .22s var(--ease),color .22s var(--ease);
}
.up:hover{background:rgba(235,135,156,.2);color:#fff}

/* ---------- 动效 ---------- */
.rv{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .26s var(--ease),transform .26s var(--ease);
}
.rv.on{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:960px){
  .shell{grid-template-columns:minmax(0,1fr)}
  .side{position:static;margin-top:6px}
  .side-nav ul{grid-template-columns:1fr 1fr;gap:2px 8px}
  .stream > article{scroll-margin-top:150px}
}

@media (max-width:860px){
  .topbar{grid-template-columns:minmax(0,1fr);gap:6px;padding:6px 8px}
  .brand{order:0;justify-self:center}
  .wing{order:1}
  .wing ul{
    flex-wrap:nowrap;
    overflow-x:auto;
    scrollbar-width:none;
    padding-bottom:2px;
  }
  .wing ul::-webkit-scrollbar{display:none}
  .wing-r ul{justify-content:flex-start}
  .wing a{padding:7px 8px}
}

@media (max-width:760px){
  .base-grid{grid-template-columns:1fr 1fr}
  .base-grid .foot-col:first-child{grid-column:1/-1}
  .base-low{align-items:flex-start}
}

@media (max-width:420px){
  .side-nav ul{grid-template-columns:1fr}
  .shell{padding:18px 12px 44px}
  .paper{padding:16px 13px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .rv{opacity:1;transform:none;transition:none}
  .wing a,.brand,.side-nav a,.foot-col a,.up{transition:none}
}

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