@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;700;900&display=swap');

:root{
  --ink:#E7ECF5;
  --dim:#96A1B4;
  --line:#171C25;
  --panel:#080808;
  --card:#0A0D13;
  --cy:#31E7CE;
  --bl:#4C7DFF;
  --gd:#F2C24B;
  --r:10px;
}

*{box-sizing:border-box}

html{
  background:#000;
  color-scheme:dark;
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  background:#000;
  color:var(--ink);
  font-family:Outfit,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
}

h1,h2,h3{font-weight:900;line-height:1.15;letter-spacing:-.02em;margin:0}
p{margin:0 0 1em}
a{color:#D3E2FF;text-decoration:none}
a:hover{color:#fff}
img{max-width:100%}
:focus-visible{outline:2px solid var(--cy);outline-offset:3px;border-radius:4px}

/* 顶栏 */
.topbar{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(0,0,0,.94);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}

.ann{
  margin:0;
  padding:7px 18px;
  font-size:12px;
  font-weight:500;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:#6E7A8E;
  border-bottom:1px solid #0E1218;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

.bar{
  display:flex;
  align-items:center;
  gap:10px;
  padding:6px 14px 8px;
}

.mark{
  display:grid;
  place-items:center;
  min-width:44px;
  height:44px;
  padding:0 9px;
  flex:none;
  border:1px solid #1E2632;
  border-radius:var(--r);
  background:#0C1118;
  color:var(--cy);
  font-weight:900;
  font-size:15px;
  letter-spacing:.02em;
}
.mark-logo{width:26px;height:26px;object-fit:contain;display:block}

.mainnav{
  display:flex;
  gap:2px;
  padding-left:4px;
  overflow-x:auto;
  scrollbar-width:none;
  min-width:0;
}
.mainnav::-webkit-scrollbar{display:none}

.mainnav a{
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:44px;
  padding:11px 12px;
  border-radius:8px;
  font-size:15px;
  font-weight:500;
  color:#96A1B4;
  white-space:nowrap;
}
.mainnav a i{
  width:6px;
  height:6px;
  flex:none;
  background:#2B3444;
  transform:rotate(45deg);
}
.mainnav a:hover,
.mainnav a[aria-current]{color:#fff;background:#0E141C}
.mainnav a:hover i,
.mainnav a[aria-current] i{background:var(--cy);box-shadow:0 0 10px var(--cy)}

/* 主视觉 */
.hero{
  position:relative;
  display:flex;
  align-items:flex-end;
  justify-content:flex-end;
  min-height:calc(100vh - 104px);
  padding:64px 24px 78px;
  overflow:hidden;
  isolation:isolate;
  background:
    radial-gradient(80% 60% at 18% 22%,#0A1526 0%,transparent 62%),
    radial-gradient(60% 50% at 88% 78%,#0B1020 0%,transparent 60%),
    #000;
}

.hero::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:-1;
  background:linear-gradient(100deg,rgba(0,0,0,.24),rgba(0,0,0,.82) 72%);
}

.hero-art{position:absolute;inset:0;z-index:-2}

.cut{
  position:absolute;
  overflow:hidden;
  background:linear-gradient(145deg,#0C1524,#050505 62%);
  box-shadow:0 34px 70px rgba(0,0,0,.9);
  border:1px solid #1B2330;
}
.cut img{width:100%;height:100%;object-fit:cover;display:block}

.cut-a{
  left:3%;
  top:14%;
  width:45%;
  max-width:430px;
  aspect-ratio:4/5;
  clip-path:polygon(0 0,100% 7%,91% 100%,5% 93%);
  transform:rotate(-1.6deg);
}
.cut-b{
  left:37%;
  top:33%;
  width:33%;
  max-width:320px;
  aspect-ratio:1/1;
  clip-path:polygon(7% 4%,100% 0,93% 96%,0 100%);
  transform:rotate(1.8deg);
}

.band{
  position:absolute;
  left:0;
  right:0;
  bottom:22%;
  height:70px;
  z-index:-1;
  opacity:.5;
  background:linear-gradient(90deg,var(--bl),var(--cy) 52%,rgba(49,231,206,0));
  clip-path:polygon(0 36%,100% 0,100% 60%,0 100%);
}

.hero-copy{
  position:relative;
  max-width:680px;
  text-align:right;
}

.hero-copy h1{
  font-size:clamp(36px,6.2vw,76px);
  line-height:1.04;
  letter-spacing:-.035em;
  text-shadow:0 0 26px rgba(49,231,206,.16);
}

.lede{
  margin:20px 0 0;
  font-size:16px;
  line-height:1.7;
  color:#ABB6C8;
  max-width:52ch;
  margin-left:auto;
}

/* 版心 */
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}

.stage{
  display:grid;
  grid-template-columns:minmax(0,1fr) 302px;
  gap:40px;
  align-items:start;
  padding:64px 0 84px;
}

/* 正文 */
.prose{
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--r);
  padding:34px 30px 40px;
  box-shadow:0 22px 56px rgba(0,0,0,.8);
  overflow-wrap:break-word;
}

.prose article{scroll-margin-top:108px}
.prose article + article{
  margin-top:40px;
  padding-top:40px;
  border-top:1px solid #14191F;
}

.prose h2{
  font-size:clamp(23px,2.6vw,31px);
  padding-left:16px;
  border-left:4px solid var(--cy);
  margin:0 0 14px;
  color:#fff;
}

.prose h3{
  font-size:19px;
  margin:28px 0 10px;
  color:#DEE6F3;
}

.prose .subtitle,
.prose .subhead,
.prose .lead,
.prose .desc{
  margin:-4px 0 18px;
  font-size:15px;
  color:#7F8B9E;
  line-height:1.7;
}

.prose p{margin:0 0 1.05em;color:#C7D0DE}
.prose strong{color:#fff;font-weight:700}
.prose ul,.prose ol{padding-left:1.35em;color:#C7D0DE}
.prose li{margin:.4em 0}
.prose ul li::marker{color:var(--cy)}
.prose ol li::marker{color:var(--gd);font-weight:700}
.prose blockquote{
  margin:24px 0;
  padding:16px 20px;
  border-left:3px solid var(--bl);
  background:#0A0F18;
  border-radius:0 var(--r) var(--r) 0;
  color:#B9C5D8;
}
.prose blockquote p:last-child{margin:0}
.prose code{
  font-size:.94em;
  padding:2px 6px;
  border-radius:5px;
  background:#111823;
  color:var(--cy);
}
.prose pre{
  overflow-x:auto;
  padding:16px 18px;
  border:1px solid #1B2431;
  border-radius:var(--r);
  background:#070A0F;
}
.prose pre code{padding:0;background:none}
.prose img{border-radius:var(--r);height:auto}
.prose figure{margin:22px 0}
.prose figcaption{
  margin-top:8px;
  font-size:13px;
  color:#6E7A8E;
}
.prose table{
  width:100%;
  border-collapse:collapse;
  font-size:15px;
  display:block;
  overflow-x:auto;
}
.prose th,.prose td{
  padding:10px 12px;
  border-bottom:1px solid #1A212B;
  text-align:left;
}
.prose th{color:#fff;font-weight:700;background:#0C1118}
.prose a{border-bottom:1px solid rgba(76,125,255,.45)}
.prose a:hover{border-bottom-color:var(--cy);color:#fff}
.prose hr{border:0;height:1px;background:#161C25;margin:34px 0}

/* 侧栏 */
.side{
  position:sticky;
  top:112px;
  background:var(--card);
  border:1px solid #1A212B;
  border-radius:var(--r);
  padding:22px 20px 18px;
  box-shadow:0 24px 48px rgba(0,0,0,.72);
}

.side h2{
  font-size:18px;
  letter-spacing:0;
  color:#fff;
}

.side .subtitle{
  margin:9px 0 16px;
  font-size:13px;
  line-height:1.6;
  color:#6E7A8E;
}

.side ol{
  list-style:none;
  margin:0;
  padding:0;
  counter-reset:sl;
  display:grid;
  gap:2px;
}

.side li{counter-increment:sl}

.side li a{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:42px;
  padding:8px 8px;
  border-radius:8px;
  font-size:15px;
  color:#A6B2C4;
}
.side li a::before{
  content:counter(sl,decimal-leading-zero);
  font-size:11px;
  font-weight:700;
  letter-spacing:.12em;
  color:#4E596B;
  flex:none;
}
.side li a:hover{background:#101720;color:#fff}
.side li a:hover::before{color:var(--cy)}

.to-top{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  margin-top:14px;
  padding:0 4px;
  font-size:13px;
  letter-spacing:.1em;
  color:#6E7A8E;
}
.to-top::before{content:"";width:18px;height:1px;background:currentColor;margin-right:8px}
.to-top:hover{color:var(--cy)}

/* 页脚 */
.foot{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:14px 20px;
  max-width:1180px;
  margin:0 auto;
  padding:28px 20px 44px;
  border-top:1px solid #151A22;
}

.foot-mark a{
  display:grid;
  place-items:center;
  min-width:44px;
  height:40px;
  padding:0 8px;
  border:1px solid #1E2632;
  border-radius:8px;
  color:var(--cy);
  font-weight:900;
  font-size:14px;
}
.foot-mark .mark-logo{width:22px;height:22px}

.foot-nav{flex:1 1 auto;min-width:0}
.foot-nav dl{
  display:flex;
  flex-wrap:wrap;
  gap:0 14px;
  margin:0;
}
.foot-nav dt{
  align-self:center;
  font-size:11px;
  font-weight:700;
  letter-spacing:.14em;
  color:#4A5465;
}
.foot-nav dd{margin:0}
.foot-nav dd a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:0 2px;
  font-size:14px;
  color:#8E99AC;
}
.foot-nav dd a:hover{color:#fff}

.foot-copy{margin-left:auto}
.foot-copy p{margin:0;font-size:13px;color:#57627A}

/* 动效 */
@media (prefers-reduced-motion: no-preference){
  .prose > *{animation:rise .5s cubic-bezier(.2,.7,.3,1) both}
  .prose > *:nth-child(2){animation-delay:.05s}
  .prose > *:nth-child(3){animation-delay:.1s}
  .prose > *:nth-child(4){animation-delay:.15s}
  .prose > *:nth-child(5){animation-delay:.2s}
  .prose > *:nth-child(6){animation-delay:.25s}
  .prose > *:nth-child(7){animation-delay:.3s}
  .prose > *:nth-child(n+8){animation-delay:.34s}

  @keyframes rise{
    from{opacity:0;transform:translateY(14px)}
    to{opacity:1;transform:none}
  }

  .hero-copy h1{animation:rise .8s cubic-bezier(.2,.7,.3,1) both}
  .lede{animation:rise .8s .12s cubic-bezier(.2,.7,.3,1) both}
}

/* 中屏 */
@media (max-width:1000px){
  .stage{grid-template-columns:minmax(0,1fr);gap:28px}
  .side{position:static;order:2}
  .cut-a{width:52%;left:2%}
  .cut-b{width:36%;left:40%}
}

/* 小屏 */
@media (max-width:720px){
  body{font-size:16px}
  .hero{
    min-height:calc(100vh - 116px);
    padding:44px 18px 56px;
    align-items:flex-end;
  }
  .hero::before{background:linear-gradient(180deg,rgba(0,0,0,.42),rgba(0,0,0,.9) 66%)}
  .hero-copy{text-align:left;max-width:none}
  .lede{margin-left:0;font-size:15px}
  .cut-a{left:-6%;top:8%;width:66%;opacity:.55}
  .cut-b{left:46%;top:26%;width:52%;opacity:.5}
  .band{bottom:30%;height:44px;opacity:.4}
  .wrap{padding:0 16px}
  .stage{padding:44px 0 60px}
  .prose{padding:24px 18px 30px}
  .prose h2{padding-left:12px;border-left-width:3px}
  .ann{letter-spacing:.16em;font-size:11px;padding:6px 14px}
  .bar{padding:6px 10px 8px;gap:8px}
  .mainnav a{padding:11px 10px;font-size:14px}
  .foot{flex-direction:column;align-items:flex-start;gap:10px;padding:22px 16px 34px}
  .foot-nav dl{gap:0 12px}
  .foot-copy{margin-left:0}
}

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