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

:root{
  --ink:#111318;
  --ink-2:#181b22;
  --accent:#FF4D2E;
  --accent-soft:rgba(255,77,46,.14);
  --paper:#F5F2EC;
  --line:rgba(245,242,236,.14);
  --muted:rgba(245,242,236,.64);
  --dock:64px;
  --font:"Rubik","Nunito Sans",system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--ink);color-scheme:dark}
body{
  margin:0;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font);
  font-size:17px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,p,dl,dd,dt,figure{margin:0}
ul{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%;height:auto}
a:focus-visible{outline:2px solid var(--accent);outline-offset:3px}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;
  min-height:70vh;
  display:flex;
  align-items:flex-end;
  overflow:hidden;
  padding:clamp(20px,4vw,48px);
  padding-bottom:clamp(72px,12vh,140px);
  border-bottom:1px solid var(--line);
}
.hero-media{
  position:absolute;
  inset:0;
  background:radial-gradient(circle at 26% 22%,#262a34 0%,#14161c 62%,#0d0f13 100%);
}
.hero-media img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:grayscale(.35) contrast(1.06);
}
.hero-media::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(17,19,24,.42) 0%,rgba(17,19,24,.62) 42%,rgba(17,19,24,.96) 100%);
}
.hero-inner{
  position:relative;
  z-index:2;
  width:100%;
  max-width:1180px;
  margin:0 auto;
}
.badge{
  display:inline-flex;
  align-items:center;
  min-height:36px;
  padding:4px 12px;
  margin-bottom:18px;
  border:1px solid var(--accent);
  color:var(--accent);
  font-size:15px;
  letter-spacing:.2em;
  animation:drift 6s ease-in-out infinite;
}
.hero-title{
  font-size:clamp(2.4rem,10.5vw,7rem);
  line-height:1.04;
  font-weight:700;
  letter-spacing:-.035em;
  max-width:min(100%,20ch);
  word-break:break-word;
}
.ch{
  display:inline-block;
  opacity:0;
  transform:translateY(.36em) rotate(2.5deg);
  animation:rise .62s cubic-bezier(.2,.7,.2,1) forwards;
}
.hero-sub{
  margin-top:22px;
  max-width:48ch;
  font-size:clamp(16px,1.6vw,19px);
  color:var(--muted);
}

/* ---------- 主体框架 ---------- */
.shell{
  display:grid;
  grid-template-columns:212px minmax(0,1fr);
  gap:clamp(24px,4vw,60px);
  max-width:1180px;
  margin:0 auto;
  padding:clamp(30px,5vw,68px) clamp(18px,4vw,44px) 24px;
}
.rail{
  position:sticky;
  top:24px;
  align-self:start;
}
.rail-title{
  font-size:15px;
  font-weight:500;
  letter-spacing:.24em;
  color:var(--accent);
  margin-bottom:14px;
}
.rail-title span{display:inline-block;border-bottom:2px solid var(--accent);padding-bottom:4px}
.rail ul{border-left:1px solid var(--line)}
.rail a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:10px 12px;
  margin-left:-1px;
  border-left:2px solid transparent;
  font-size:16px;
  color:var(--muted);
  transition:color .2s ease,border-color .2s ease;
}
.rail a:hover,.rail a:focus-visible{color:var(--paper);border-left-color:var(--accent)}

main{min-width:0}
.content{max-width:74ch}
main section{scroll-margin-top:34px}
.content section + section{
  margin-top:clamp(40px,6vw,80px);
  padding-top:clamp(26px,4vw,48px);
  border-top:1px solid var(--line);
}
.content h2{
  font-size:clamp(1.45rem,3.6vw,2.1rem);
  line-height:1.22;
  font-weight:600;
  letter-spacing:-.02em;
  margin-bottom:16px;
}
.content h2 span{display:inline-block;border-bottom:3px solid var(--accent);padding-bottom:4px}
.content h3{
  font-size:clamp(1.15rem,2.4vw,1.4rem);
  line-height:1.3;
  font-weight:600;
  margin:26px 0 12px;
}
.content h3 span{color:var(--accent)}
.content p{margin:0 0 16px;color:rgba(245,242,236,.88)}
.content a{color:var(--accent);border-bottom:1px solid rgba(255,77,46,.42)}
.content a:hover{border-bottom-color:var(--accent)}
.content ul{margin:0 0 18px}
.content ul li{position:relative;padding-left:22px;margin-bottom:10px}
.content ul li::before{
  content:"";
  position:absolute;
  left:0;
  top:.66em;
  width:10px;
  height:2px;
  background:var(--accent);
}
.content ol{margin:0 0 18px;padding-left:22px;list-style:decimal}
.content ol li{margin-bottom:10px}
.content strong,.content b{font-weight:600;color:var(--paper)}
.content blockquote{
  margin:0 0 18px;
  padding:14px 18px;
  border-left:3px solid var(--accent);
  background:var(--accent-soft);
  color:var(--muted);
}
.content figure{margin:22px 0}
.content img{width:100%;height:auto}
.content figcaption{font-size:15px;color:var(--muted);margin-top:8px}
.content table{width:100%;border-collapse:collapse;margin:0 0 18px;font-size:16px}
.content th,.content td{border-bottom:1px solid var(--line);padding:10px 8px;text-align:left}
.content th{color:var(--accent);font-weight:500}

/* ---------- 底部固定条 ---------- */
.dock{
  position:fixed;
  left:0;
  right:0;
  bottom:0;
  z-index:60;
  display:flex;
  align-items:center;
  gap:8px;
  padding:8px 12px;
  background:rgba(13,15,19,.94);
  border-top:1px solid var(--line);
  backdrop-filter:blur(10px);
}
.dock-logo{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-width:44px;
  height:44px;
  border:1px solid var(--line);
  color:var(--accent);
}
.dock-logo img{width:26px;height:26px;object-fit:contain}
.dock-logo .mark{font-size:16px;font-weight:600;letter-spacing:.02em;padding:0 6px}
.dock-nav{flex:1 1 auto;min-width:0;overflow-x:auto;overscroll-behavior-x:contain;scrollbar-width:none}
.dock-nav::-webkit-scrollbar{display:none}
.dock-nav ul{display:flex;gap:2px}
.dock-nav a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 12px;
  font-size:16px;
  white-space:nowrap;
  color:var(--muted);
  box-shadow:inset 0 -2px 0 transparent;
  transition:color .2s ease,box-shadow .2s ease;
}
.dock-nav a:hover,.dock-nav a:focus-visible{color:var(--paper);box-shadow:inset 0 -2px 0 var(--accent)}
.dock-cta{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 14px;
  font-size:16px;
  background:var(--accent);
  color:#14161c;
  font-weight:500;
}

/* ---------- 页脚 ---------- */
.site-foot{
  max-width:1180px;
  margin:0 auto;
  padding:clamp(36px,6vw,80px) clamp(18px,4vw,44px) calc(var(--dock) + 34px);
  border-top:1px solid var(--line);
}
.cta{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:20px;
  padding-bottom:clamp(24px,4vw,44px);
  margin-bottom:clamp(26px,4vw,44px);
  border-bottom:1px solid var(--line);
}
.cta-big{
  font-size:clamp(1.9rem,7.5vw,4.6rem);
  line-height:1.02;
  font-weight:700;
  letter-spacing:-.035em;
  background:linear-gradient(100deg,var(--paper) 8%,var(--accent) 74%,#ff9d80 100%);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.cta-btn{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:10px 20px;
  border:1px solid var(--accent);
  color:var(--accent);
  font-size:16px;
}
.cta-btn:hover{background:var(--accent);color:#14161c}
.foot-cols{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1fr;
  gap:clamp(20px,3vw,36px);
}
.foot-name{font-size:17px;font-weight:600;letter-spacing:.02em}
.foot-host{margin-top:8px;font-size:15px;color:var(--muted);word-break:break-all}
.foot-cols dt{margin:0 0 10px}
.foot-cols dt h3{font-size:15px;font-weight:500;letter-spacing:.2em;color:var(--accent)}
.foot-cols dt h3 span{display:inline-block;border-bottom:2px solid var(--accent);padding-bottom:3px}
.foot-cols dd{margin:0}
.foot-cols dd a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  font-size:16px;
  color:var(--muted);
}
.foot-cols dd a:hover,.foot-cols dd a:focus-visible{color:var(--paper)}
.foot-bar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:12px;
  margin-top:clamp(26px,4vw,44px);
  padding-top:18px;
  border-top:1px solid var(--line);
  font-size:15px;
  color:var(--muted);
}
.foot-bar .toTop a{display:inline-flex;align-items:center;min-height:40px;color:var(--accent)}

/* ---------- 动效 ---------- */
@keyframes rise{
  from{opacity:0;transform:translateY(.36em) rotate(2.5deg)}
  to{opacity:1;transform:translateY(0) rotate(0)}
}
@keyframes drift{
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(-5px)}
}
.js .rv{opacity:0;transform:translateY(18px)}
.js .rv.in{
  opacity:1;
  transform:none;
  transition:opacity .55s ease,transform .6s cubic-bezier(.2,.7,.2,1);
}

/* ---------- 断点 ---------- */
@media (max-width:860px){
  .foot-cols{grid-template-columns:1fr 1fr}
  .foot-brand{grid-column:1 / -1}
}
@media (max-width:760px){
  body{font-size:16px}
  .shell{display:block;padding-top:26px}
  .rail{position:static;margin-bottom:26px}
  .rail ul{display:flex;gap:8px;overflow-x:auto;border-left:0;scrollbar-width:none}
  .rail ul::-webkit-scrollbar{display:none}
  .rail a{
    min-height:40px;
    padding:8px 12px;
    margin-left:0;
    border-left:0;
    border:1px solid var(--line);
    white-space:nowrap;
  }
  .rail a:hover,.rail a:focus-visible{border-color:var(--accent);border-left-color:var(--accent)}
  .hero{min-height:66vh}
  .content{max-width:none}
}
@media (max-width:560px){
  .foot-cols{grid-template-columns:1fr;gap:18px}
  .foot-brand{grid-column:auto}
  .foot-bar{flex-direction:column;align-items:flex-start;gap:4px}
  .dock{padding:8px 8px}
  .dock-cta{padding:0 10px;font-size:15px}
  .dock-nav a{padding:0 10px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .badge,.ch{animation:none;opacity:1;transform:none}
  .js .rv{opacity:1;transform:none;transition:none}
}

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