@import url('https://fonts.googleapis.com/css2?family=Lexend:wght@300;400;500;600;700&family=Source+Sans+3:wght@300;400;500;600;700&display=swap');

:root{
  --ink:#0F1B2D;
  --flame:#FF4B2B;
  --cream:#F2EDE4;
  --ink-soft:#3A4A63;
  --line:rgba(15,27,45,.16);
  --font:'Lexend','Source Sans 3','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
  --r:4px;
}

*,*::before,*::after{box-sizing:border-box;}

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

body{
  margin:0;
  background:var(--cream);
  color:var(--ink);
  font-family:var(--font);
  font-size:17px;
  line-height:1.78;
  overflow-x:hidden;
  font-weight:400;
}

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

/* ---------- 顶栏 ---------- */
.topbar{
  position:sticky;top:0;z-index:50;
  display:flex;align-items:center;gap:14px;flex-wrap:wrap;
  padding:10px clamp(14px,3vw,32px);
  background:var(--ink);
  color:var(--cream);
  border-bottom:3px solid var(--flame);
}

.brand{
  display:inline-flex;align-items:center;
  min-height:44px;
  font-size:19px;font-weight:700;letter-spacing:.14em;
  color:var(--cream);text-decoration:none;white-space:nowrap;
}
.brand::before{
  content:"";width:11px;height:11px;background:var(--flame);
  margin-right:9px;display:inline-block;
}

.pill-nav{
  flex:1 1 320px;min-width:0;
  overflow-x:auto;scrollbar-width:none;
}
.pill-nav::-webkit-scrollbar{display:none;}

.pill-nav ul{
  display:flex;gap:8px;list-style:none;margin:0;padding:2px;
}
.pill-nav a{
  display:flex;align-items:center;
  min-height:40px;padding:8px 16px;
  border-radius:999px;
  border:1px solid rgba(242,237,228,.18);
  background:rgba(242,237,228,.07);
  color:var(--cream);text-decoration:none;
  font-size:16px;white-space:nowrap;
  transition:background .18s ease,color .18s ease,border-color .18s ease;
}
.pill-nav a:hover,
.pill-nav a:focus-visible{
  background:var(--flame);border-color:var(--flame);color:#fff;
}
.pill-nav a.is-active{
  background:var(--cream);border-color:var(--cream);color:var(--ink);
}

.finder{
  display:flex;align-items:center;gap:2px;
  padding:4px;border-radius:999px;
  background:rgba(242,237,228,.09);
  border:1px solid rgba(242,237,228,.22);
}
.finder input{
  width:168px;min-height:40px;
  padding:0 14px;border:0;border-radius:999px;
  background:transparent;color:var(--cream);
  font:inherit;font-size:16px;
}
.finder input::placeholder{color:rgba(242,237,228,.6);}
.finder input:focus{outline:2px solid var(--flame);outline-offset:1px;}
.finder button{
  min-height:40px;padding:0 16px;
  border:0;border-radius:999px;cursor:pointer;
  background:var(--flame);color:#fff;
  font:inherit;font-size:16px;font-weight:600;
}
.finder.is-miss input{outline:2px solid var(--flame);outline-offset:1px;animation:shake .32s ease;}

@keyframes shake{
  0%,100%{transform:translateX(0);}
  35%{transform:translateX(-4px);}
  70%{transform:translateX(4px);}
}

/* ---------- 版面骨架 ---------- */
.shell{
  display:grid;
  grid-template-columns:238px minmax(0,1fr);
  gap:clamp(18px,3vw,46px);
  max-width:1180px;
  margin:0 auto;
  padding:clamp(18px,3vw,38px) clamp(14px,3vw,32px) 64px;
}

/* ---------- 左侧索引 ---------- */
.rail{
  position:sticky;top:112px;align-self:start;
}
.rail-title{
  margin:0;font-size:16px;font-weight:600;
  letter-spacing:.18em;color:var(--ink-soft);
}
.rail-rule{
  border:0;height:3px;width:46px;background:var(--flame);
  margin:10px 0 14px;
}
.rail-list{
  list-style:none;margin:0;padding:0;
  display:flex;flex-direction:column;gap:2px;
  counter-reset:rail;
}
.rail-list li{counter-increment:rail;}
.rail-list a{
  position:relative;display:block;
  padding:10px 10px 10px 32px;
  border-radius:var(--r);
  color:var(--ink);text-decoration:none;font-size:16px;
  transition:background .16s ease,color .16s ease;
}
.rail-list a::before{
  content:counter(rail,decimal-leading-zero);
  position:absolute;left:9px;top:12px;
  font-size:14px;font-weight:600;color:var(--flame);
  letter-spacing:.04em;
}
.rail-list a:hover{background:rgba(15,27,45,.07);}
.rail-note{
  margin:16px 0 0;font-size:16px;line-height:1.6;color:var(--ink-soft);
}

/* ---------- 正文 ---------- */
.doc{min-width:0;}

.doc > article{
  padding:clamp(22px,3vw,38px) 0;
  border-top:2px solid var(--line);
  scroll-margin-top:132px;
}
.doc > article.hero{border-top:0;padding-top:0;}

.doc h2{
  margin:0 0 10px;
  font-size:clamp(1.45rem,2.7vw,2.05rem);
  line-height:1.25;letter-spacing:-.01em;font-weight:600;
}
.doc h3{
  margin:26px 0 8px;
  font-size:clamp(1.1rem,1.9vw,1.3rem);
  line-height:1.35;font-weight:600;color:var(--ink);
}
.doc hr{
  display:block;border:0;height:2px;width:100%;
  margin:0 0 18px;
  background:linear-gradient(90deg,var(--flame),rgba(255,75,43,0));
}
.doc p{margin:0 0 14px;}
.doc a{color:var(--ink);text-decoration:none;border-bottom:2px solid rgba(255,75,43,.55);}
.doc a:hover{border-bottom-color:var(--flame);color:#000;}
.doc ul,.doc ol{margin:0 0 16px;padding-left:22px;}
.doc li{margin:6px 0;}
.doc strong{font-weight:600;}
.doc blockquote{
  margin:16px 0;padding:14px 18px;
  background:rgba(15,27,45,.06);
  border-left:4px solid var(--flame);
  border-radius:var(--r);
}
.doc blockquote p:last-child{margin-bottom:0;}
.doc table{
  width:100%;border-collapse:collapse;margin:0 0 18px;font-size:16px;
}
.doc th,.doc td{
  padding:10px 12px;text-align:left;
  border-bottom:1px solid var(--line);
  vertical-align:top;
}
.doc th{background:rgba(15,27,45,.08);font-weight:600;}
.doc code{
  font-size:15px;padding:1px 6px;border-radius:var(--r);
  background:rgba(15,27,45,.09);
}
.doc figure{margin:0 0 18px;}
.doc img{max-width:100%;height:auto;border-radius:var(--r);display:block;}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;
  display:grid;
  grid-template-columns:.92fr 1.08fr;
  gap:clamp(16px,3vw,40px);
  align-items:center;
  min-height:calc(100vh - 118px);
  padding:clamp(20px,3vw,38px);
  border-radius:var(--r);
  background:var(--ink);
  color:var(--cream);
  overflow:hidden;
}

.hero-media{
  position:relative;
  margin:0;
  align-self:stretch;
  display:flex;align-items:center;justify-content:center;
  min-height:260px;
  border-radius:var(--r);
  overflow:hidden;
  background:linear-gradient(150deg,#17273e,#0a1421);
}
.hero-img{width:100%;height:100%;object-fit:cover;display:block;border-radius:var(--r);}

.plate{
  display:grid;grid-template-columns:repeat(2,1fr);
  gap:8px;padding:16px;width:100%;
}
.plate span{
  display:grid;place-items:center;
  aspect-ratio:1;
  font-size:clamp(38px,6.4vw,66px);
  font-weight:700;
  color:var(--cream);
  background:rgba(255,75,43,.16);
  border-radius:var(--r);
  animation:pop .62s cubic-bezier(.2,.8,.2,1) both;
}
.plate span:nth-child(2){animation-delay:.09s;}
.plate span:nth-child(3){animation-delay:.18s;}
.plate span:nth-child(4){animation-delay:.27s;}

@keyframes pop{
  from{opacity:0;transform:translateY(16px) scale(.9);}
  to{opacity:1;transform:none;}
}

.badge{
  position:absolute;z-index:2;
  display:inline-block;
  padding:7px 13px;border-radius:999px;
  background:var(--flame);color:#fff;
  font-size:16px;font-weight:600;letter-spacing:.06em;
  animation:bob 5s ease-in-out infinite;
}
.badge-a{top:14px;left:14px;}
.badge-b{bottom:14px;right:14px;animation-delay:1.2s;}

@keyframes bob{
  0%,100%{transform:translateY(0);}
  50%{transform:translateY(-6px);}
}

.hero-copy{text-align:right;}

.eyebrow{
  margin:0 0 14px;
  font-size:16px;letter-spacing:.2em;
  color:var(--flame);font-weight:500;
}
.typing{
  display:inline-block;
  max-width:100%;
  overflow:hidden;white-space:nowrap;
  border-left:2px solid var(--flame);
  padding-left:9px;
  animation:type 2.4s steps(18,end) both;
}
@keyframes type{
  from{max-width:0;}
  to{max-width:100%;}
}

.hero h1{
  margin:0 0 18px;
  font-size:clamp(2rem,5.4vw,4.1rem);
  line-height:1.06;
  letter-spacing:-.02em;
  font-weight:700;
  background:linear-gradient(102deg,#F7F3EC 34%,var(--flame) 100%);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  animation:rise .9s cubic-bezier(.2,.75,.2,1) both;
}
@keyframes rise{
  from{opacity:0;transform:translateY(24px);}
  to{opacity:1;transform:none;}
}

.lede{
  margin:0 0 20px auto;
  max-width:42ch;
  font-size:17px;
  color:rgba(242,237,228,.82);
}

.chips{
  list-style:none;margin:0;padding:0;
  display:flex;flex-wrap:wrap;gap:8px;justify-content:flex-end;
}
.chips a{
  display:inline-flex;align-items:center;
  min-height:40px;padding:8px 16px;
  border-radius:999px;
  border:1px solid rgba(242,237,228,.3);
  color:var(--cream);text-decoration:none;font-size:16px;
  border-bottom:1px solid rgba(242,237,228,.3);
  transition:background .18s ease,color .18s ease;
}
.chips a:hover{background:var(--cream);color:var(--ink);}

/* ---------- 滚动字幕 ---------- */
.ticker{
  margin:18px 0 0;
  overflow:hidden;
  border-radius:var(--r);
  background:var(--ink);
  color:var(--cream);
}
.ticker-track{
  display:flex;width:max-content;
  animation:slide 30s linear infinite;
}
.ticker:hover .ticker-track{animation-play-state:paused;}
.ticker-track span{
  padding:11px 20px;
  font-size:16px;letter-spacing:.1em;white-space:nowrap;
  color:rgba(242,237,228,.86);
}
.ticker-track span::after{
  content:"·";margin-left:20px;color:var(--flame);
}
@keyframes slide{
  from{transform:translateX(0);}
  to{transform:translateX(-50%);}
}

/* ---------- 尾块 ---------- */
.tail p{max-width:64ch;color:var(--ink-soft);}

/* ---------- 滚动出现 ---------- */
.reveal{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .6s ease,transform .6s cubic-bezier(.2,.75,.2,1);
}
.reveal.is-in{opacity:1;transform:none;}

.hit{animation:hit 1.1s ease;}
@keyframes hit{
  0%{background:rgba(255,75,43,.16);}
  100%{background:transparent;}
}

/* ---------- 页脚 ---------- */
.foot{
  display:grid;
  grid-template-columns:1.05fr 1fr;
  gap:16px clamp(20px,4vw,54px);
  align-items:start;
  padding:clamp(30px,4.5vw,52px) clamp(14px,3vw,32px) 18px;
  background:var(--ink);
  color:var(--cream);
}
.foot p{margin:0;font-size:16px;line-height:1.7;color:rgba(242,237,228,.82);}
.foot-brand{
  font-size:clamp(2rem,6.6vw,4rem);
  font-weight:700;line-height:1;
  letter-spacing:-.03em;
  color:var(--cream);
}
.foot-links{
  display:flex;flex-wrap:wrap;gap:2px 16px;
  align-content:start;
}
.foot-links a{
  display:inline-flex;align-items:center;
  min-height:40px;padding:8px 0;
  color:var(--flame);text-decoration:none;font-size:16px;
  border-bottom:1px solid rgba(255,75,43,.45);
  transition:color .16s ease,border-color .16s ease;
}
.foot-links a:hover{color:var(--cream);border-bottom-color:var(--cream);}
.foot-copy{
  grid-column:1 / -1;
  display:block;
  margin-top:6px;padding-top:14px;
  border-top:1px solid rgba(242,237,228,.16);
  font-size:16px;line-height:1.6;
  color:rgba(242,237,228,.6);
}

/* ---------- 断点 ---------- */
@media (max-width:960px){
  .shell{grid-template-columns:1fr;gap:18px;}
  .rail{position:static;}
  .rail-list{flex-direction:row;flex-wrap:wrap;gap:6px;}
  .rail-list a{padding:9px 14px;background:rgba(15,27,45,.06);}
  .rail-list a::before{display:none;}
  .rail-rule{margin-bottom:10px;}
  .rail-note{display:none;}
  .hero{min-height:auto;grid-template-columns:1fr;}
  .hero-copy{text-align:left;order:-1;}
  .lede{margin-left:0;}
  .chips{justify-content:flex-start;}
  .badge-b{display:none;}
  .doc > article{scroll-margin-top:180px;}
  .foot{grid-template-columns:1fr;}
}

@media (max-width:620px){
  .topbar{gap:8px;}
  .finder{flex:1 1 100%;}
  .finder input{width:auto;flex:1 1 auto;min-width:0;}
  .hero{padding:18px 16px;}
  .hero h1{font-size:clamp(1.9rem,8.4vw,2.6rem);}
  .plate span{font-size:clamp(30px,11vw,46px);}
  .doc table{display:block;overflow-x:auto;}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  .hero h1,.typing,.plate span,.badge,.ticker-track,.finder.is-miss input{
    animation:none !important;
  }
  .reveal{opacity:1;transform:none;transition:none;}
}

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