@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@700&display=swap');

:root{
  --blue:#3bb1ff;
  --red:#ff5252;
  --ink:#000;
  --paper:#eaf7ff;
  --white:#fff;
  --blue-soft:#cdeaff;
  --red-soft:#ffd9d9;
  --line:3px solid var(--ink);
  --sh:5px 5px 0 var(--ink);
  --sh-sm:3px 3px 0 var(--ink);
}

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

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

body{
  margin:0;
  overflow-x:hidden;
  background:var(--paper);
  color:var(--ink);
  font-family:"Space Grotesk",system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:17px;
  line-height:1.65;
}

h1,h2,h3{font-weight:700;letter-spacing:-.015em;line-height:1.2}
p{margin:0 0 14px}
img{max-width:100%;height:auto;display:block}
a{color:inherit}
ul,ol{margin:0;padding:0}

a:focus-visible{
  outline:3px solid var(--red);
  outline-offset:3px;
}

/* ---------- 顶部：细条 + 粘性导航 ---------- */
.topbar{
  position:sticky;
  top:0;
  z-index:60;
  width:100%;
  max-width:100%;
  background:var(--white);
  border-bottom:var(--line);
}

.ticker{
  background:var(--ink);
  color:var(--white);
  text-align:center;
  padding:5px 12px;
  overflow:hidden;
}
.ticker-txt{
  display:inline-block;
  font-size:16px;
  font-weight:700;
  letter-spacing:.14em;
  white-space:nowrap;
  max-width:100%;
  overflow:hidden;
  text-overflow:ellipsis;
}

.nav{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);
  align-items:center;
  gap:6px;
  width:100%;
  max-width:100%;
  padding:8px 12px;
  overflow-x:auto;
  overscroll-behavior-x:contain;
  scrollbar-width:thin;
}

.nav-group{
  display:flex;
  align-items:center;
  gap:4px;
  list-style:none;
  min-width:0;
}
.nav-a{justify-content:flex-end}
.nav-b{justify-content:flex-start}

.nav-group a{
  display:inline-flex;
  align-items:center;
  gap:6px;
  min-height:44px;
  padding:8px 10px;
  font-size:16px;
  font-weight:700;
  text-decoration:none;
  white-space:nowrap;
  border:3px solid transparent;
  border-radius:4px;
}
.nav-group a:hover{
  background:var(--blue);
  border-color:var(--ink);
  box-shadow:var(--sh-sm);
}

.ico{
  width:10px;
  height:10px;
  flex:none;
  background:var(--red);
  border:2px solid var(--ink);
  border-radius:2px;
}
.nav-b .ico{background:var(--blue)}

.brand{
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:44px;
  padding:6px 14px;
  font-size:18px;
  font-weight:700;
  white-space:nowrap;
  text-decoration:none;
  background:var(--blue);
  border:var(--line);
  border-radius:4px;
  box-shadow:var(--sh-sm);
}
.brand-logo{width:30px;height:30px;object-fit:contain}

/* ---------- 主区域 ---------- */
main{
  max-width:1140px;
  margin:0 auto;
  padding:0 14px;
}

.stage{
  display:grid;
  grid-template-columns:1.15fr .85fr;
  gap:20px;
  align-items:center;
  min-height:45vh;
  margin:14px 0 22px;
  padding:22px;
  background:var(--white);
  border:var(--line);
  border-radius:4px;
  box-shadow:7px 7px 0 var(--blue);
}

.stage-h1{
  margin:0 0 12px;
  font-size:clamp(30px,5.4vw,52px);
  line-height:1.05;
  text-shadow:3px 3px 0 var(--blue);
  overflow-wrap:anywhere;
}
.stage-lede{
  max-width:46ch;
  margin:0 0 18px;
  font-size:17px;
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:48px;
  padding:10px 22px;
  font-size:17px;
  font-weight:700;
  text-decoration:none;
  background:var(--red);
  border:var(--line);
  border-radius:4px;
  box-shadow:var(--sh);
  transition:transform .12s ease,box-shadow .12s ease;
}
.btn:hover{
  transform:translate(3px,3px);
  box-shadow:2px 2px 0 var(--ink);
}
.btn-dark{background:var(--white);color:var(--ink)}

.stage-art{
  margin:0;
  border:var(--line);
  border-radius:4px;
  box-shadow:6px 6px 0 var(--red);
  background:var(--blue-soft);
  overflow:hidden;
  will-change:transform;
}
.stage-img{
  width:100%;
  height:100%;
  aspect-ratio:4/3;
  object-fit:cover;
}
.stage-blank{
  aspect-ratio:4/3;
  background:var(--blue);
  border-left:14px solid var(--red);
}

/* ---------- 正文 + 右侧边栏 ---------- */
.split{
  display:grid;
  grid-template-columns:minmax(0,1fr) 300px;
  gap:22px;
  align-items:start;
  padding-bottom:40px;
}

.prose{
  min-width:0;
  padding:20px 20px 8px;
  background:var(--white);
  border:var(--line);
  border-radius:4px;
  box-shadow:var(--sh);
}

.prose section[id]{
  scroll-margin-top:170px;
  padding-bottom:26px;
  margin-bottom:26px;
  border-bottom:3px solid var(--ink);
}
.prose section[id]:last-child{
  border-bottom:0;
  margin-bottom:0;
  padding-bottom:8px;
}

.prose h2{
  margin:0 0 10px;
  font-size:clamp(22px,3.6vw,30px);
}
.prose h3{
  margin:22px 0 8px;
  font-size:20px;
}
.prose hr{
  height:0;
  margin:0 0 16px;
  border:0;
  border-top:3px solid var(--ink);
}
.prose p{margin:0 0 14px}
.prose ul,.prose ol{margin:0 0 14px;padding-left:22px}
.prose li{margin:0 0 8px}
.prose a{
  font-weight:700;
  background:var(--blue-soft);
  text-decoration:underline;
  text-underline-offset:3px;
}
.prose a:hover{background:var(--red-soft)}
.prose strong{background:var(--red-soft);padding:0 3px}
.prose blockquote{
  margin:0 0 16px;
  padding:12px 16px;
  background:var(--paper);
  border-left:6px solid var(--red);
}
.prose figure{margin:0 0 16px}
.prose figcaption{font-size:16px;padding-top:6px}
.prose table{
  width:100%;
  border-collapse:collapse;
  margin:0 0 16px;
  font-size:16px;
}
.prose th,.prose td{
  border:var(--line);
  padding:8px 10px;
  text-align:left;
}
.prose th{background:var(--blue-soft)}
.prose pre{
  max-width:100%;
  overflow-x:auto;
  padding:12px;
  background:var(--paper);
  border:var(--line);
}

.rail{
  position:sticky;
  top:150px;
  padding:16px;
  background:var(--blue-soft);
  border:var(--line);
  border-radius:4px;
  box-shadow:var(--sh);
}
.rail-h{
  margin:0 0 8px;
  font-size:18px;
  letter-spacing:.16em;
}
.rail hr{
  height:0;
  margin:0 0 10px;
  border:0;
  border-top:3px solid var(--ink);
}
.rail-list{
  list-style:none;
  counter-reset:rail;
}
.rail-list li{counter-increment:rail}
.rail-list a{
  display:flex;
  align-items:center;
  gap:8px;
  min-height:44px;
  padding:6px 2px;
  font-size:16px;
  font-weight:700;
  text-decoration:none;
  border-bottom:2px solid rgba(0,0,0,.22);
}
.rail-list li:last-child a{border-bottom:0}
.rail-list a::before{
  content:counter(rail,decimal-leading-zero);
  font-size:16px;
  color:var(--red);
  -webkit-text-stroke:.4px var(--ink);
}
.rail-list a:hover{background:var(--white)}

/* ---------- 页脚 ---------- */
footer{
  padding:30px 14px 22px;
  background:var(--ink);
  color:var(--white);
  border-top:3px solid var(--ink);
}

.foot-cta,
.foot-main,
.foot-legal{
  max-width:1140px;
  margin-left:auto;
  margin-right:auto;
}

.foot-cta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:22px;
  margin-bottom:26px;
  color:var(--ink);
  background:var(--blue);
  border:var(--line);
  border-radius:4px;
  box-shadow:6px 6px 0 var(--red);
}
.foot-cta h2{
  margin:0;
  font-size:clamp(22px,4.6vw,34px);
  line-height:1.1;
  overflow-wrap:anywhere;
}

.foot-main{
  display:grid;
  grid-template-columns:1.2fr 1fr;
  gap:26px;
  margin-bottom:24px;
}
.foot-mark{
  margin:0 0 8px;
  font-size:20px;
  font-weight:700;
  overflow-wrap:anywhere;
}
.foot-desc{font-size:16px;color:var(--blue-soft);margin:0}
.foot-h{
  margin:0 0 8px;
  font-size:18px;
  letter-spacing:.12em;
}
.foot-col{min-width:0}
.foot-col hr{
  height:0;
  margin:0 0 10px;
  border:0;
  border-top:3px solid var(--white);
}
.foot-links{list-style:none}
.foot-links a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:2px 0;
  font-size:16px;
  font-weight:700;
  text-decoration:none;
  border-bottom:2px solid transparent;
}
.foot-links a:hover{
  color:var(--blue);
  border-bottom-color:var(--blue);
}

.foot-legal{
  padding-top:14px;
  border-top:3px solid var(--white);
}
.foot-legal p{
  margin:0;
  font-size:16px;
  color:var(--blue-soft);
}

/* ---------- 动效 ---------- */
.reveal{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .5s ease,transform .5s ease;
}
.reveal.is-in{
  opacity:1;
  transform:none;
}

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

/* ---------- 窄屏 ---------- */
@media (max-width:900px){
  .nav{
    display:flex;
    align-items:center;
    gap:6px;
    padding:8px 10px;
    overflow-x:auto;
    -webkit-overflow-scrolling:touch;
  }
  .brand{order:-1;flex:none}
  .nav-group{flex:none}
  .nav-a{order:0}
  .nav-b{order:1}
  .split{grid-template-columns:1fr}
  .rail{position:static}
  .stage{
    grid-template-columns:1fr;
    min-height:0;
    padding:18px 16px 20px;
    box-shadow:5px 5px 0 var(--blue);
  }
  .stage-art{box-shadow:5px 5px 0 var(--red)}
  .prose section[id]{scroll-margin-top:150px}
  .foot-main{grid-template-columns:1fr}
  .prose{box-shadow:4px 4px 0 var(--ink)}
}

@media (max-width:520px){
  body{font-size:16px}
  main{padding:0 12px}
  .prose{padding:16px 14px 4px}
  .stage{padding:16px 14px 18px}
  .stage-h1{font-size:clamp(28px,8.6vw,38px)}
  .ticker-txt{letter-spacing:.08em}
  .foot-cta{box-shadow:4px 4px 0 var(--red)}
  .foot-cta{padding:18px 14px}
  .rail{padding:14px}
  footer{padding:24px 12px 18px}
}

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