@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,400;0,600;0,700;0,800;1,400&display=swap');

:root{
  --ink:#1B1F3B;
  --hi:#4F46E5;
  --mist:#E8E9F3;
  --bg:#0D1022;
  --panel:rgba(27,31,59,.55);
  --line:rgba(232,233,243,.15);
  --dim:rgba(232,233,243,.70);
  --r:28px;
  --topH:128px;
  --pad:clamp(16px,4vw,40px);
}

*{box-sizing:border-box}

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

body{
  margin:0;
  background:var(--bg);
  color:var(--mist);
  font-family:"Plus Jakarta Sans","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  letter-spacing:.005em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}

img{display:block;max-width:100%}
h1,h2,h3,h4{font-weight:800;letter-spacing:-.02em;line-height:1.25}
a{color:inherit}
p{margin:0}

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

:focus-visible{outline:2px solid var(--hi);outline-offset:3px}

hr{
  border:0;
  height:2px;
  width:64px;
  margin:0;
  background:linear-gradient(90deg,var(--hi),rgba(232,233,243,.06));
}

/* 背景分层 */
.bg-layers{position:fixed;inset:0;z-index:0;overflow:hidden;pointer-events:none}
.bg-layers .l{position:absolute;will-change:transform}
.l1{
  left:-16%;top:-14%;width:82vw;height:82vw;border-radius:50%;
  background:radial-gradient(circle at 50% 50%,rgba(79,70,229,.32),rgba(79,70,229,0) 68%);
  transform:translate3d(0,calc(var(--sc,0) * -.05px),0);
}
.l2{
  right:-22%;top:34%;width:74vw;height:74vw;border-radius:50%;
  background:radial-gradient(circle at 50% 50%,rgba(27,31,59,.95),rgba(27,31,59,0) 70%);
  transform:translate3d(0,calc(var(--sc,0) * .09px),0);
}
.l3{inset:0;background:linear-gradient(180deg,rgba(13,16,34,0) 42%,rgba(13,16,34,.9) 94%)}

/* 进度 */
.progress{position:fixed;left:0;right:0;top:0;height:3px;z-index:60;background:rgba(232,233,243,.08)}
.progress span{display:block;height:100%;width:100%;transform:scaleX(0);transform-origin:0 50%;background:linear-gradient(90deg,var(--hi),var(--mist))}

/* 顶部两行 */
.top{
  position:fixed;
  inset:0 0 auto;
  z-index:50;
  padding:10px var(--pad) 12px;
  background:rgba(13,16,34,.92);
  backdrop-filter:blur(16px);
  border-bottom:1px solid var(--line);
}
.brand-row{display:flex;align-items:center;min-height:40px;margin-bottom:6px}
.brand{
  display:inline-flex;align-items:center;gap:10px;
  min-height:40px;text-decoration:none;
  font-size:19px;font-weight:800;letter-spacing:-.01em;
}
.brand .mark{width:30px;height:30px;border-radius:10px;background:var(--hi);object-fit:cover}

.menu-row{display:flex;align-items:center;gap:10px;min-width:0}
.pills{
  flex:1 1 auto;min-width:0;
  display:flex;gap:8px;
  overflow-x:auto;padding-bottom:2px;
  scrollbar-width:none;
}
.pills::-webkit-scrollbar{display:none}
.pill{
  flex:0 0 auto;
  display:inline-flex;align-items:center;
  min-height:42px;padding:0 18px;
  border-radius:999px;border:1px solid var(--line);
  background:rgba(232,233,243,.05);
  color:var(--mist);text-decoration:none;font-size:16px;
  transition:background .25s,color .25s,border-color .25s,transform .25s;
}
.pill:hover,.pill:focus-visible{background:var(--hi);border-color:var(--hi);color:#fff;transform:translateY(-2px)}
.pill.off{display:none}

.finder{flex:0 0 auto}
.finder input{
  width:clamp(108px,16vw,168px);height:42px;
  border-radius:999px;border:1px solid var(--line);
  background:rgba(232,233,243,.05);
  color:var(--mist);padding:0 16px;
  font:inherit;font-size:16px;
  transition:border-color .25s,background .25s;
}
.finder input::placeholder{color:var(--dim)}
.finder input:focus{outline:none;border-color:var(--hi);background:rgba(79,70,229,.2)}

/* 首屏 */
main{position:relative;z-index:1}

.hero{
  position:relative;
  min-height:45vh;
  display:flex;flex-direction:column;justify-content:flex-end;
  padding:calc(var(--topH) + 26px) var(--pad) 0;
  overflow:hidden;
}
.hero-word{
  position:absolute;
  left:var(--pad);right:var(--pad);
  top:calc(var(--topH) + 6px);
  margin:0;
  font-size:clamp(44px,12vw,150px);
  line-height:.86;
  font-weight:800;
  letter-spacing:-.05em;
  color:rgba(232,233,243,.085);
  white-space:nowrap;
  pointer-events:none;
  will-change:transform;
  transform:translate3d(0,calc(var(--sc,0) * -.1px),0);
}
.hero-inner{
  position:relative;z-index:2;
  display:flex;flex-direction:column;align-items:center;gap:20px;
  width:100%;text-align:center;
}
.hero h1{
  margin:0;
  font-size:clamp(27px,4.8vw,52px);
  max-width:19em;
  text-wrap:balance;
}
.hero-media{
  position:relative;
  width:100%;max-width:960px;
  aspect-ratio:16/7;
  border-radius:var(--r);
  overflow:hidden;
  border:1px solid var(--line);
  background:linear-gradient(135deg,#1B1F3B 0%,#4F46E5 58%,#2B3068 100%);
}
.hero-media img{width:100%;height:100%;object-fit:cover}

/* 正文骨架 */
.wrap{max-width:1180px;margin:0 auto;padding:clamp(30px,5vw,64px) var(--pad) 0}
.stage{
  display:grid;
  grid-template-columns:248px minmax(0,1fr);
  gap:clamp(22px,3.6vw,52px);
  align-items:start;
}

/* 左栏 */
.rail{
  position:sticky;
  top:calc(var(--topH) + 18px);
  border:1px solid var(--line);
  border-radius:var(--r);
  background:var(--panel);
  padding:18px 20px 22px;
}
.rail h2{margin:0 0 10px;font-size:16px;letter-spacing:.2em;font-weight:700}
.rail hr{margin:0 0 12px}
.rail-nav{display:flex;flex-direction:column}
.rail-nav a{
  display:flex;align-items:center;
  min-height:42px;
  font-size:16px;color:var(--dim);text-decoration:none;
  border-bottom:1px dashed var(--line);
  transition:color .2s,padding-left .2s;
}
.rail-nav a:last-child{border-bottom:0}
.rail-nav a:hover{color:var(--mist);padding-left:6px}

/* 正文 */
.prose{counter-reset:ch;min-width:0}
.prose article{
  position:relative;
  padding:clamp(26px,4vw,44px) 0 clamp(10px,2vw,18px);
  border-top:1px solid var(--line);
  scroll-margin-top:calc(var(--topH) + 24px);
}
.prose article:first-child{border-top:0;padding-top:0}
.prose article:last-child{padding-bottom:clamp(20px,3vw,34px)}
.prose article::before{
  content:counter(ch,decimal-leading-zero);
  counter-increment:ch;
  display:block;
  margin-bottom:6px;
  font-size:14px;font-weight:700;letter-spacing:.24em;
  color:var(--hi);
}
.prose h2{margin:0 0 4px;font-size:clamp(22px,3.1vw,34px)}
.prose h2 + hr{margin:10px 0 20px}
.prose h3{margin:30px 0 8px;font-size:clamp(19px,2.2vw,23px)}
.prose p{margin:0 0 18px}
.prose a{color:#fff;text-decoration:underline;text-decoration-color:var(--hi);text-underline-offset:4px}
.prose a:hover{text-decoration-thickness:2px}
.prose ul,.prose ol{margin:0 0 18px;padding-left:1.3em}
.prose li{margin:0 0 8px}
.prose strong{color:#fff}
.prose blockquote{
  margin:22px 0;padding:18px 22px;
  border-radius:var(--r);
  background:rgba(79,70,229,.16);
  border:1px solid rgba(79,70,229,.35);
}
.prose blockquote p:last-child{margin:0}
.prose img{border-radius:var(--r);margin:22px 0}

/* 页脚 */
.foot{
  position:relative;z-index:1;
  margin-top:clamp(40px,7vw,96px);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(27,31,59,.55),rgba(13,16,34,.98));
  padding:clamp(30px,5vw,56px) var(--pad) 22px;
}
.foot-top{
  max-width:1180px;margin:0 auto;
  display:grid;
  grid-template-columns:1.1fr .85fr .7fr;
  gap:clamp(20px,4vw,44px);
  align-items:start;
}
.bigmark{
  margin:0;font-size:clamp(30px,5.6vw,60px);line-height:1;
  font-weight:800;letter-spacing:-.04em;
  background:linear-gradient(120deg,#fff 8%,var(--hi));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.foot-nav dl{
  display:grid;
  grid-template-columns:1fr auto 1fr auto;
  column-gap:12px;row-gap:2px;margin:0;
}
.foot-nav dt{margin:0}
.foot-nav dd{margin:0;align-self:center;font-size:13px;letter-spacing:.14em;color:var(--hi)}
.foot-nav a{
  display:flex;align-items:center;min-height:40px;
  font-size:16px;color:var(--mist);text-decoration:none;opacity:.86;
}
.foot-nav a:hover{opacity:1;color:#fff;text-decoration:underline;text-decoration-color:var(--hi);text-underline-offset:3px}
.foot-side address{font-style:normal;font-size:16px;margin-bottom:8px}
.foot-links{list-style:none;margin:0;padding:0}
.foot-links li{margin:0}
.foot-links a{
  display:flex;align-items:center;min-height:40px;
  font-size:16px;color:var(--dim);text-decoration:none;
}
.foot-links a:hover{color:#fff}
.copy{
  max-width:1180px;margin:clamp(20px,3vw,34px) auto 0;
  padding-top:14px;border-top:1px solid var(--line);
  font-size:16px;color:var(--dim);text-align:center;
}

/* 入场 */
.anim .rail,.anim .prose article{
  opacity:0;
  transform:translateY(20px);
  transition:opacity .65s ease,transform .65s cubic-bezier(.2,.7,.3,1);
}
.anim .rail.is-in,.anim .prose article.is-in{opacity:1;transform:none}

@media (max-width:1000px){
  .stage{grid-template-columns:1fr}
  .rail{position:static;order:-1}
  .foot-top{grid-template-columns:1fr 1fr}
  .bigmark{grid-column:1/-1}
  .foot-side{grid-column:1/-1}
}

@media (max-width:720px){
  :root{--topH:120px}
  body{font-size:16.5px}
  .hero{min-height:0;padding-top:calc(var(--topH) + 18px)}
  .hero-word{font-size:clamp(36px,15vw,78px)}
  .hero-media{aspect-ratio:16/9}
  .finder input{width:104px}
  .foot-nav dl{grid-template-columns:1fr auto 1fr auto}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .anim .rail,.anim .prose article{opacity:1;transform:none;transition:none}
  .hero-word,.hero-media,.l1,.l2{transform:none !important}
  .pill:hover{transform:none}
}

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