@import url('https://fonts.googleapis.com/css2?family=Chakra+Petch:wght@300;400;500;600;700&family=Russo+One&display=swap');

:root{
  --ink:#0F0E12;
  --red:#E8434A;
  --cyan:#35D0C0;
  --paper:#F2EEF4;
  --muted:#9C97A6;
  --line:rgba(255,255,255,.13);
  --bar-h:72px;
  --font:'Chakra Petch','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --display:'Russo One','Chakra Petch','PingFang SC','Microsoft YaHei',sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font);
  font-size:17px;
  line-height:1.72;
  letter-spacing:.01em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
p{margin:0 0 16px}

/* 视差层 */
.stage{
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  overflow:hidden;
  background:radial-gradient(70% 60% at 50% -10%,#1c1422 0%,#0F0E12 68%);
}
.lyr{position:absolute;left:0;right:0;top:-30%;bottom:-30%;display:block;will-change:transform}
.lyr-1{background:radial-gradient(38% 30% at 20% 26%,rgba(232,67,74,.30),transparent 72%)}
.lyr-2{background:radial-gradient(44% 34% at 82% 62%,rgba(53,208,192,.20),transparent 72%)}
.lyr-3{background:repeating-linear-gradient(118deg,rgba(255,255,255,.035) 0 1px,transparent 1px 8px)}

/* 首屏 */
.hero{
  position:relative;
  min-height:100vh;
  display:grid;
  place-items:center;
  text-align:center;
  padding:110px 22px 150px;
  overflow:hidden;
  isolation:isolate;
  clip-path:polygon(0 0,100% 0,100% 89%,0 100%);
}
.hero-fig{position:absolute;inset:0;margin:0;z-index:-1}
.hero-pic{width:100%;height:100%;object-fit:cover;opacity:.55}
.hero-fig::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(155deg,rgba(15,14,18,.42),rgba(15,14,18,.95));
}
.hero-txt{max-width:920px;position:relative}
.hero-txt::before{
  content:"";
  position:absolute;
  left:50%;
  top:-26px;
  width:70px;
  height:4px;
  transform:translateX(-50%);
  background:linear-gradient(90deg,var(--red),var(--cyan));
  border-radius:4px;
}
h1{
  font-family:var(--display);
  font-size:clamp(2.1rem,7vw,4.5rem);
  line-height:1.08;
  letter-spacing:.02em;
  margin:0 0 18px;
  text-shadow:0 0 34px rgba(232,67,74,.45);
}
.hero-lede{
  max-width:46ch;
  margin:0 auto;
  color:#cbc5d4;
  font-size:1.02rem;
  line-height:1.8;
}

/* 主体框架 */
main{padding-bottom:34px}
.chapter{
  max-width:1180px;
  margin:0 auto;
  padding:58px 22px 24px;
  display:grid;
  grid-template-columns:228px minmax(0,1fr);
  gap:46px;
  align-items:start;
}

/* 左栏 */
.rail{
  position:sticky;
  top:26px;
  padding:6px 0 6px 16px;
  border-left:2px solid rgba(53,208,192,.55);
}
.rail h2{
  font-family:var(--display);
  font-size:1rem;
  letter-spacing:.22em;
  margin:0 0 8px;
  color:var(--cyan);
}
.rail hr{
  border:0;
  height:1px;
  margin:0 0 14px;
  background:linear-gradient(90deg,var(--cyan),transparent);
}
.rail ul{list-style:none;margin:0;padding:0;display:grid;gap:2px}
.rail a{
  display:block;
  padding:9px 4px;
  font-size:1rem;
  color:#b6b0c0;
  border-bottom:1px dashed rgba(255,255,255,.09);
  transition:color .2s ease,transform .2s ease;
}
.rail a:hover,.rail a.on{color:var(--red);transform:translateX(4px)}

/* 正文 */
.flow{min-width:0}
.flow > article{
  position:relative;
  margin:0 0 32px;
  padding:42px 28px 46px;
  background:linear-gradient(180deg,rgba(255,255,255,.048),rgba(255,255,255,.012));
  border-radius:10px;
  border-bottom:3px solid rgba(232,67,74,.55);
  box-shadow:0 26px 60px -40px #000;
  scroll-margin-top:26px;
  scroll-margin-bottom:calc(var(--bar-h) + 20px);
}
article[id]{scroll-margin-top:26px}
.flow h2{
  font-family:var(--display);
  font-size:clamp(1.4rem,3.4vw,2.05rem);
  line-height:1.22;
  letter-spacing:.01em;
  margin:0 0 6px;
  color:#fff;
}
.flow h2 + hr,.flow h3 + hr{
  border:0;
  height:3px;
  width:66px;
  margin:0 0 22px;
  border-radius:3px;
  background:linear-gradient(90deg,var(--red),var(--cyan));
}
.flow h3{font-size:1.2rem;line-height:1.4;margin:28px 0 6px;color:var(--cyan)}
.flow p{color:#d7d2df}
.flow strong{color:#fff}
.flow a{color:var(--cyan);border-bottom:1px solid rgba(53,208,192,.42)}
.flow a:hover{color:#fff;border-bottom-color:var(--red)}
.flow ul,.flow ol{margin:0 0 18px;padding-left:1.3em}
.flow li{margin-bottom:9px}
.flow figure{margin:22px 0;border-radius:10px;overflow:hidden;border-bottom:3px solid var(--cyan)}
.flow blockquote{
  margin:20px 0;
  padding:12px 18px;
  border-left:3px solid var(--red);
  background:rgba(232,67,74,.09);
  border-radius:0 10px 10px 0;
}
.flow img{border-radius:10px;margin:18px 0}

/* 页脚 */
footer{
  max-width:1180px;
  margin:0 auto;
  padding:26px 22px calc(var(--bar-h) + 24px);
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  align-items:center;
  gap:8px;
  color:var(--muted);
  font-size:1rem;
}
footer p{margin:0}
footer small{font-size:1rem}
footer a{color:var(--cyan)}
footer a:hover{color:var(--red)}

/* 底部固定条 */
.bar{
  position:fixed;
  left:0;
  right:0;
  bottom:0;
  z-index:40;
  padding:8px 14px calc(8px + env(safe-area-inset-bottom,0px));
  background:rgba(12,11,16,.92);
  backdrop-filter:blur(14px);
  border-top:1px solid var(--line);
}
.bar-in{
  display:grid;
  grid-template-columns:1fr auto 1fr auto;
  align-items:center;
  gap:6px;
  max-width:1240px;
  margin:0 auto;
}
.nl,.nr{display:flex;align-items:center;gap:2px;margin:0}
.nr{justify-content:flex-end}
.nl a,.nr a,.has-sub > a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:8px 11px;
  font-size:1rem;
  color:#c7c1d0;
  border-radius:8px;
  transition:color .2s ease,background .2s ease;
}
.nl a:hover,.nr a:hover,.has-sub > a:hover{color:#fff;background:rgba(232,67,74,.18)}
.brand{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:6px 16px;
  font-family:var(--display);
  font-size:1.12rem;
  letter-spacing:.16em;
  white-space:nowrap;
  background:linear-gradient(90deg,var(--red),var(--cyan));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.cta{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:8px 18px;
  border-radius:999px;
  font-size:1rem;
  font-weight:600;
  color:#fff;
  background:linear-gradient(120deg,var(--red),#bf2843);
  box-shadow:0 10px 24px -14px rgba(232,67,74,.95);
  transition:transform .18s ease,box-shadow .18s ease;
}
.cta:hover{transform:translateY(-2px);box-shadow:0 14px 26px -12px rgba(232,67,74,1)}

/* 分组下拉 */
.has-sub{position:relative;display:inline-flex;align-items:center}
.sub{
  position:absolute;
  left:50%;
  bottom:calc(100% + 12px);
  transform:translate(-50%,8px);
  display:grid;
  gap:4px;
  min-width:156px;
  padding:8px;
  background:#17141d;
  border:1px solid var(--line);
  border-bottom:2px solid var(--red);
  border-radius:10px;
  opacity:0;
  visibility:hidden;
  transition:opacity .2s ease,transform .2s ease,visibility .2s;
}
.sub a{border-radius:8px}
.has-sub:hover .sub,.has-sub:focus-within .sub{opacity:1;visibility:visible;transform:translate(-50%,0)}

/* 滚动显现 */
.js .flow > article,.js .rail{
  opacity:0;
  transform:translateY(26px);
  transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.3,1);
}
.js .flow > article.in,.js .rail.in{opacity:1;transform:none}

/* 移动端 */
@media (max-width:880px){
  :root{--bar-h:158px}
  body{font-size:17px}
  .hero{padding:96px 18px 170px;clip-path:polygon(0 0,100% 0,100% 94%,0 100%)}
  .chapter{grid-template-columns:1fr;gap:24px;padding:34px 14px 18px}
  .rail{position:static;border-left:0;border-top:2px solid rgba(53,208,192,.55);padding:12px 0 0}
  .rail ul{display:flex;flex-wrap:wrap;gap:8px}
  .rail a{
    display:inline-flex;
    align-items:center;
    min-height:40px;
    padding:7px 12px;
    border:1px solid var(--line);
    border-radius:999px;
  }
  .flow > article{padding:30px 16px 34px;margin-bottom:22px}
  .bar-in{display:flex;flex-wrap:wrap;align-items:center;column-gap:4px;row-gap:2px}
  .brand{order:-1;flex:1;justify-content:flex-start;letter-spacing:.1em;font-size:1.05rem}
  .cta{order:-1}
  .nl{order:1;flex:1 0 100%;justify-content:space-between}
  .nr{order:2;flex:1 0 100%;justify-content:space-between}
  .nl a,.nr a,.has-sub > a{padding:8px 6px;min-height:42px}
  .sub{
    position:static;
    transform:none;
    opacity:1;
    visibility:visible;
    display:inline-flex;
    gap:0;
    min-width:0;
    padding:0;
    border:0;
    background:none;
  }
  .has-sub{display:inline-flex;align-items:center}
  footer{padding:22px 16px calc(var(--bar-h) + 20px)}
}

@media (min-width:881px){
  .hero{background-attachment:fixed}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.01ms !important;animation-duration:.01ms !important}
  .js .flow > article,.js .rail{opacity:1;transform:none}
}

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