@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&display=swap');

:root{
  --red:#ff0000;
  --purple:#8b00ff;
  --ink:#261717;
  --paper:#f8f2f3;
  --mute:rgba(248,242,243,.68);
  --dim:rgba(248,242,243,.5);
  --glass:rgba(255,255,255,.07);
  --glass-2:rgba(255,255,255,.12);
  --line:rgba(255,255,255,.18);
  --line-soft:rgba(255,255,255,.09);
  --shadow:0 30px 70px -40px rgba(0,0,0,.95);
  --blur:blur(16px) saturate(150%);
  --max:1240px;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  min-height:100vh;
  font-family:Inter,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  font-size:17px;
  line-height:1.78;
  color:var(--paper);
  background:#140b0d;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---------- 背景光斑与纵深 ---------- */
.stage{
  position:fixed;
  inset:-10vh -10vw;
  z-index:-2;
  pointer-events:none;
  background:
    radial-gradient(620px 520px at 8% 2%, rgba(255,0,0,.55), transparent 64%),
    radial-gradient(560px 540px at 96% 12%, rgba(139,0,255,.52), transparent 62%),
    radial-gradient(760px 620px at 52% 102%, rgba(38,23,23,.95), transparent 68%),
    radial-gradient(420px 380px at 74% 62%, rgba(255,0,0,.22), transparent 70%),
    linear-gradient(158deg,#2b0c11 0%,#160a15 42%,#1e0d0c 100%);
  filter:saturate(115%);
}
body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background:
    linear-gradient(180deg, rgba(20,11,13,.55), rgba(20,11,13,.1) 22%, rgba(20,11,13,.85)),
    radial-gradient(120% 90% at 50% 0%, rgba(255,255,255,.1), transparent 46%);
}

/* ---------- 顶部导航 ---------- */
.topbar{
  position:sticky;
  top:0;
  z-index:60;
  padding:14px 18px 8px;
}
.dock{
  max-width:var(--max);
  margin:0 auto;
  display:flex;
  align-items:center;
  gap:6px;
  padding:7px 10px;
  background:rgba(255,255,255,.08);
  backdrop-filter:var(--blur);
  -webkit-backdrop-filter:var(--blur);
  border:1px solid var(--line);
  box-shadow:var(--shadow), inset 0 1px 0 rgba(255,255,255,.3);
}
.dock-side{
  display:flex;
  align-items:center;
  gap:2px;
  flex:1 1 0;
  list-style:none;
  margin:0;
  padding:0;
  min-width:0;
}
.dock-side.lf{justify-content:flex-end}
.dock-side.rt{justify-content:flex-start}
.dock-side a{
  display:flex;
  align-items:center;
  gap:6px;
  min-height:42px;
  padding:8px 9px;
  font-size:.94rem;
  line-height:1.2;
  color:var(--mute);
  text-decoration:none;
  position:relative;
  white-space:nowrap;
  transition:color .2s ease;
}
.dock-side a::after{
  content:"";
  position:absolute;
  left:9px;
  right:9px;
  bottom:5px;
  height:2px;
  background:linear-gradient(90deg,var(--red),var(--purple));
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .28s ease;
}
.dock-side a:hover,.dock-side a[aria-current],.dock-side a:focus-visible{color:#fff}
.dock-side a:hover::after,.dock-side a[aria-current]::after,.dock-side a:focus-visible::after{transform:scaleX(1)}
.ic svg{
  width:13px;
  height:13px;
  display:block;
  fill:none;
  stroke:currentColor;
  stroke-width:1.3;
  stroke-linecap:round;
  stroke-linejoin:round;
  opacity:.85;
}
.brand{
  display:flex;
  align-items:center;
  gap:8px;
  padding:10px 16px;
  font-size:1.02rem;
  font-weight:600;
  letter-spacing:.1em;
  color:#fff;
  text-decoration:none;
  white-space:nowrap;
}
.brand .mark{
  width:9px;
  height:9px;
  background:linear-gradient(135deg,var(--red),var(--purple));
  box-shadow:0 0 12px rgba(255,0,0,.7);
}
.search{
  display:flex;
  align-items:center;
  border-left:1px solid var(--line);
  padding-left:9px;
  margin-left:4px;
}
.search input{
  width:118px;
  min-height:40px;
  padding:7px 10px;
  font:inherit;
  font-size:.88rem;
  color:#fff;
  background:rgba(0,0,0,.28);
  border:1px solid var(--line-soft);
  border-radius:0;
  transition:width .25s ease,border-color .2s ease;
}
.search input::placeholder{color:var(--dim)}
.search input:focus{
  outline:none;
  width:152px;
  border-color:rgba(255,255,255,.5);
}

/* ---------- 主栅格 ---------- */
.shell{
  max-width:var(--max);
  margin:0 auto;
  padding:14px 20px 0;
  display:grid;
  grid-template-columns:minmax(0,1fr) 296px;
  gap:38px;
  align-items:start;
}
.sheet{min-width:0}

/* ---------- Hero ---------- */
.hero{
  position:relative;
  min-height:45vh;
  display:flex;
  flex-direction:column;
  justify-content:center;
  padding:34px 0 40px;
  border-bottom:1px solid var(--line);
  overflow:hidden;
}
.eyebrow{
  display:inline-block;
  font-size:.76rem;
  font-weight:500;
  letter-spacing:.24em;
  color:rgba(255,255,255,.75);
  margin-bottom:6px;
}
.eyebrow::before{
  content:"";
  display:inline-block;
  width:26px;
  height:2px;
  margin-right:10px;
  vertical-align:middle;
  background:linear-gradient(90deg,var(--red),var(--purple));
}
.hero h1{
  position:relative;
  z-index:1;
  margin:.28em 0 .3em;
  max-width:22ch;
  font-size:clamp(2rem,5.9vw,4.2rem);
  font-weight:600;
  line-height:1.14;
  letter-spacing:-.025em;
  text-shadow:0 20px 50px rgba(0,0,0,.55);
}
.lede{
  position:relative;
  z-index:1;
  max-width:46ch;
  margin:0 0 26px;
  font-size:1rem;
  color:var(--mute);
}
.hero-act{display:flex;flex-wrap:wrap;gap:12px;margin:0}
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:46px;
  padding:11px 22px;
  font-size:.94rem;
  letter-spacing:.04em;
  text-decoration:none;
  border:1px solid var(--line);
  background:var(--glass);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  transition:transform .2s ease,background .2s ease;
}
.btn.solid{
  background:linear-gradient(96deg,var(--red),var(--purple));
  border-color:transparent;
  color:#fff;
  font-weight:500;
  box-shadow:0 18px 44px -22px rgba(255,0,0,.9);
}
.btn.ghost{color:rgba(255,255,255,.86)}
.btn:hover{transform:translateY(-2px)}
.btn.ghost:hover{background:var(--glass-2)}
.hero-ghost{
  position:absolute;
  right:-1.5vw;
  bottom:-3vh;
  z-index:0;
  font-size:clamp(5.5rem,19vw,15rem);
  font-weight:600;
  line-height:.8;
  letter-spacing:-.05em;
  color:rgba(255,255,255,.055);
  -webkit-text-stroke:1px rgba(255,255,255,.08);
  pointer-events:none;
  will-change:transform;
}

/* ---------- 正文流 ---------- */
.stream{padding-top:30px}
.stream > section{
  position:relative;
  margin:0 0 26px;
  padding:32px 30px 38px;
  background:var(--glass);
  backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  border:1px solid var(--line);
  box-shadow:var(--shadow), inset 0 1px 0 rgba(255,255,255,.16);
  scroll-margin-top:112px;
}
.stream > section::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  background:linear-gradient(90deg,var(--red),var(--purple));
  opacity:.9;
}
.stream > section > small{
  display:inline-block;
  font-size:.74rem;
  font-weight:500;
  letter-spacing:.24em;
  color:rgba(255,255,255,.62);
  margin-bottom:4px;
}
.stream > section > small::before{
  content:"";
  display:inline-block;
  width:20px;
  height:2px;
  margin-right:9px;
  vertical-align:middle;
  background:linear-gradient(90deg,var(--red),var(--purple));
}
.stream h2{
  margin:.1em 0 .62em;
  font-size:clamp(1.34rem,2.5vw,1.78rem);
  font-weight:600;
  line-height:1.32;
  letter-spacing:-.01em;
  color:#fff;
}
.stream h3{
  margin:1.5em 0 .5em;
  font-size:1.1rem;
  font-weight:600;
  color:#fff;
}
.stream p{margin:0 0 1em;color:rgba(248,242,243,.87)}
.stream strong{color:#fff;font-weight:600}
.stream a{
  color:#fff;
  text-decoration:none;
  box-shadow:inset 0 -1px 0 0 var(--purple),inset 0 -2px 0 0 rgba(255,0,0,.55);
}
.stream a:hover{background:rgba(255,0,0,.16)}
.stream ul,.stream ol{margin:0 0 1.1em;padding-left:1.25em}
.stream li{margin:.3em 0;color:rgba(248,242,243,.87)}
.stream li::marker{color:rgba(255,0,0,.85)}
.stream blockquote{
  margin:1.2em 0;
  padding:14px 18px;
  border-left:2px solid var(--purple);
  background:rgba(139,0,255,.1);
  color:rgba(248,242,243,.92);
}
.stream blockquote p:last-child{margin-bottom:0}
.stream table{
  width:100%;
  border-collapse:collapse;
  margin:1.1em 0;
  font-size:.94rem;
  background:rgba(0,0,0,.24);
}
.stream th,.stream td{
  padding:10px 12px;
  border:1px solid var(--line-soft);
  text-align:left;
  color:rgba(248,242,243,.88);
}
.stream th{background:rgba(255,255,255,.08);color:#fff;font-weight:600}
.stream code{
  padding:.1em .4em;
  font-size:.92em;
  background:rgba(0,0,0,.36);
  border:1px solid var(--line-soft);
}
.stream hr{border:0;height:1px;background:var(--line);margin:1.6em 0}

/* ---------- 右侧速览 ---------- */
.rail{position:sticky;top:96px;padding-top:30px}
.rail-card{
  padding:24px 22px 26px;
  background:var(--glass-2);
  backdrop-filter:var(--blur);
  -webkit-backdrop-filter:var(--blur);
  border:1px solid var(--line);
  box-shadow:var(--shadow), inset 0 1px 0 rgba(255,255,255,.22);
}
.rail-card h2{
  margin:.15em 0 .85em;
  font-size:1.1rem;
  font-weight:600;
  line-height:1.4;
  color:#fff;
}
.rail-list{
  list-style:none;
  margin:0 0 14px;
  padding:0;
  counter-reset:rail;
}
.rail-list li{counter-increment:rail}
.rail-list a{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:42px;
  padding:7px 6px;
  font-size:.94rem;
  color:var(--mute);
  text-decoration:none;
  border-bottom:1px solid var(--line-soft);
  transition:color .2s ease,padding-left .2s ease;
}
.rail-list a::before{
  content:counter(rail,decimal-leading-zero);
  font-size:.72rem;
  letter-spacing:.1em;
  color:rgba(255,255,255,.42);
}
.rail-list a:hover{color:#fff;padding-left:12px}
.rail-note{
  margin:0;
  font-size:.82rem;
  line-height:1.7;
  color:var(--dim);
}

/* ---------- 页脚 ---------- */
.foot{
  max-width:var(--max);
  margin:64px auto 0;
  padding:24px 20px 42px;
  display:flex;
  align-items:center;
  gap:18px;
  flex-wrap:wrap;
  border-top:1px solid var(--line);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}
.foot-brand{
  font-size:clamp(1.4rem,3.6vw,2.1rem);
  font-weight:600;
  letter-spacing:-.02em;
  line-height:1.1;
  background:linear-gradient(104deg,#fff,rgba(255,255,255,.5));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.foot nav{flex:1 1 auto}
.foot nav ul{
  display:flex;
  flex-wrap:wrap;
  gap:0 2px;
  list-style:none;
  margin:0;
  padding:0;
}
.foot nav a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:6px 9px;
  font-size:.86rem;
  color:var(--dim);
  text-decoration:none;
}
.foot nav a:hover{color:#fff}
.foot-copy{
  font-size:.8rem;
  color:rgba(248,242,243,.46);
  white-space:nowrap;
}

/* ---------- 动效 ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
.stream > section.hit{border-color:rgba(255,0,0,.8)}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .hero-ghost{transform:none!important}
  .btn{transition:none}
}

/* ---------- 断点 ---------- */
@media (max-width:1080px){
  .dock-side a{font-size:.88rem;padding:8px 7px}
  .search input{width:96px}
  .search input:focus{width:120px}
}
@media (max-width:960px){
  .shell{grid-template-columns:minmax(0,1fr);gap:0}
  .rail{position:static;padding-top:8px}
  .rail-card{margin-bottom:8px}
}
@media (max-width:820px){
  .topbar{padding:10px 12px 6px}
  .dock{flex-wrap:wrap;padding:7px 9px;row-gap:4px}
  .brand{order:1;flex:1 1 auto;padding:8px 6px;font-size:.98rem}
  .search{order:2;border-left:0;padding-left:0;margin-left:0}
  .search input{width:104px}
  .search input:focus{width:120px}
  .dock-side{flex:1 0 100%;order:3;gap:0}
  .dock-side.lf,.dock-side.rt{justify-content:space-between}
  .dock-side a{font-size:.86rem;padding:6px 3px;min-height:42px}
  .dock-side a::after{left:3px;right:3px}
  .ic{display:none}
  .hero{padding:26px 0 32px}
  .stream > section{padding:26px 18px 32px;scroll-margin-top:126px}
  .shell{padding:10px 13px 0}
  .foot{margin-top:44px;padding:20px 13px 36px;gap:10px}
  .foot-brand{flex:1 0 100%}
  .foot nav{flex:1 0 100%;order:2}
  .foot-copy{flex:1 0 100%;order:3;white-space:normal}
}
@media (max-width:420px){
  body{font-size:16px}
  .hero h1{font-size:clamp(1.9rem,8.4vw,2.6rem)}
  .hero-ghost{font-size:42vw}
  .btn{flex:1 1 auto;padding:11px 14px;font-size:.9rem}
}

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