:root{
  --paper:#ffffff;
  --paper-2:#f5f5f5;
  --ink:#1f1f1f;
  --ink-2:#3b3b3b;
  --ink-3:#6d6d6d;
  --line:#e3e3e3;
  --r:10px;
  --maxw:1140px;
  --e1:0 1px 2px rgba(31,31,31,.07);
  --e2:0 6px 18px rgba(31,31,31,.10);
  --e3:0 16px 40px rgba(31,31,31,.16);
  --e4:0 30px 74px rgba(31,31,31,.22);
}
*,*::before,*::after{box-sizing:border-box}
html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
  overflow-x:clip;
}
body{
  margin:0;
  background:var(--paper-2);
  color:var(--ink);
  font-family:"Work Sans","Outfit",system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:16px;
  line-height:1.7;
  overflow-x:clip;
}
h1,h2,h3,.brand-name,.foot-brand{
  font-family:"Outfit","Work Sans",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
}
a{color:inherit}
img{max-width:100%}
.vh{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--ink);outline-offset:2px;border-radius:6px}

/* ---------- 顶部两行：品牌行 + 菜单行 ---------- */
.masthead{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(255,255,255,.8);
  -webkit-backdrop-filter:blur(16px) saturate(1.1);
  backdrop-filter:blur(16px) saturate(1.1);
  border-bottom:1px solid var(--line);
  box-shadow:var(--e2);
}
.brandrow{
  max-width:var(--maxw);
  margin:0 auto;
  padding:8px clamp(14px,4vw,36px);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  flex-wrap:wrap;
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:6px 0;
  text-decoration:none;
  color:var(--ink);
}
.brand-mark{
  width:30px;
  height:30px;
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border-radius:9px;
  background:var(--ink);
  color:#fff;
  font-size:.8rem;
  font-weight:600;
  box-shadow:var(--e1);
  object-fit:contain;
}
.brand-name{font-weight:600;font-size:1.06rem;letter-spacing:.05em}
.find{display:flex;align-items:center;gap:8px}
.find input{
  height:44px;
  width:min(240px,44vw);
  padding:0 16px;
  border:1px solid var(--line);
  border-radius:999px;
  background:#fff;
  color:var(--ink);
  font:inherit;
  font-size:.94rem;
  box-shadow:var(--e1);
  transition:box-shadow .25s ease,border-color .25s ease;
}
.find input:focus{border-color:var(--ink);box-shadow:var(--e2);outline:none}
.find button{
  height:44px;
  padding:0 18px;
  border:1px solid var(--ink);
  border-radius:999px;
  background:var(--ink);
  color:#fff;
  font:inherit;
  font-size:.9rem;
  letter-spacing:.06em;
  cursor:pointer;
  box-shadow:var(--e2);
  transition:transform .2s ease,box-shadow .2s ease;
}
.find button:hover{transform:translateY(-1px);box-shadow:var(--e3)}
.menubar{border-top:1px solid var(--line);background:rgba(255,255,255,.55)}
.menu{
  max-width:var(--maxw);
  margin:0 auto;
  padding:4px clamp(14px,4vw,36px);
  list-style:none;
  display:flex;
  align-items:center;
  gap:2px;
  overflow-x:auto;
  scrollbar-width:none;
  counter-reset:m;
}
.menu::-webkit-scrollbar{display:none}
.menu>li{flex:0 0 auto;counter-increment:m}
.menu>li>a{
  display:block;
  min-height:44px;
  padding:11px 12px;
  border-radius:8px;
  font-size:.94rem;
  letter-spacing:.03em;
  color:var(--ink-2);
  text-decoration:none;
  white-space:nowrap;
  transition:background .2s ease,color .2s ease;
}
.menu>li>a::before{
  content:counter(m,decimal-leading-zero);
  margin-right:7px;
  font-family:"Outfit",sans-serif;
  font-size:.7rem;
  color:#adadad;
  letter-spacing:0;
}
.menu>li>a:hover{background:var(--paper-2);color:var(--ink)}
.menu>li:nth-child(2),.menu>li:nth-child(5){position:relative;margin-left:12px}
.menu>li:nth-child(2)::before,.menu>li:nth-child(5)::before{
  content:"";
  position:absolute;
  left:-7px;
  top:50%;
  width:1px;
  height:18px;
  transform:translateY(-50%);
  background:var(--line);
}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;
  isolation:isolate;
  display:flex;
  align-items:center;
  min-height:100vh;
  min-height:100svh;
  padding:clamp(80px,14vh,150px) clamp(18px,5vw,60px) clamp(90px,14vh,150px);
  background:#141414;
  color:#fff;
  overflow:hidden;
}
.hero-figure{position:absolute;inset:0;margin:0;z-index:0}
.hero-figure img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
  transform:scale(1.06);
  transform-origin:center top;
  will-change:transform;
}
.hero::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  background:linear-gradient(114deg,rgba(18,18,18,.94) 0%,rgba(18,18,18,.78) 40%,rgba(18,18,18,.36) 68%,rgba(18,18,18,.62) 100%);
}
.hero::after{
  content:"";
  position:absolute;
  left:-6%;
  right:-6%;
  bottom:-2px;
  height:clamp(48px,10vw,124px);
  z-index:2;
  background:var(--paper-2);
  clip-path:polygon(0 100%,100% 0,100% 100%);
}
.hero-inner{
  position:relative;
  z-index:3;
  max-width:min(760px,100%);
  animation:rise .8s cubic-bezier(.2,.7,.3,1) both;
}
@keyframes rise{from{opacity:0;transform:translateY(26px)}to{opacity:1;transform:none}}
.hero h1{
  margin:0 0 18px;
  font-size:clamp(2.1rem,6.2vw,4.5rem);
  font-weight:600;
  line-height:1.05;
  letter-spacing:-.035em;
  text-shadow:0 10px 40px rgba(0,0,0,.35);
}
.hero-desc{
  margin:0;
  max-width:44ch;
  font-size:clamp(1rem,1.6vw,1.14rem);
  line-height:1.85;
  color:rgba(255,255,255,.88);
}

/* ---------- 主舞台：左栏 + 正文 ---------- */
.stage{
  position:relative;
  z-index:3;
  max-width:var(--maxw);
  margin:0 auto;
  padding:clamp(26px,5vw,64px) clamp(14px,4vw,36px) clamp(48px,9vw,100px);
  display:grid;
  grid-template-columns:250px minmax(0,1fr);
  gap:clamp(18px,2.6vw,34px);
  align-items:start;
}
.rail{position:sticky;top:140px;z-index:8;align-self:start}
.rail-inner{
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--r);
  padding:18px 18px 8px;
  box-shadow:var(--e3);
}
.rail-title{
  margin:0 0 4px;
  font-size:1.06rem;
  font-weight:600;
  line-height:1.35;
  letter-spacing:-.01em;
}
.subtitle{
  margin:0 0 12px;
  font-size:.86rem;
  line-height:1.65;
  color:var(--ink-3);
}
.rail-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--line);counter-reset:r}
.rail-list li{counter-increment:r}
.rail-list a{
  display:flex;
  align-items:baseline;
  gap:9px;
  min-height:40px;
  padding:9px 2px;
  border-bottom:1px solid var(--line);
  font-size:.89rem;
  line-height:1.4;
  color:var(--ink-2);
  text-decoration:none;
  transition:color .2s ease,transform .2s ease;
}
.rail-list a::before{
  content:counter(r,decimal-leading-zero);
  font-family:"Outfit",sans-serif;
  font-size:.72rem;
  color:#b0b0b0;
}
.rail-list a:hover{color:var(--ink);transform:translateX(2px)}

/* ---------- 正文卡片流 ---------- */
.flow{
  position:relative;
  z-index:1;
  counter-reset:sec;
  display:flex;
  flex-direction:column;
  gap:clamp(16px,2vw,26px);
  min-width:0;
}
.flow>section{
  counter-increment:sec;
  position:relative;
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--r);
  padding:clamp(20px,3vw,38px);
  scroll-margin-top:158px;
  transition:transform .3s ease,box-shadow .3s ease;
}
.flow>section:nth-child(even){margin-left:clamp(0px,3vw,50px)}
.flow>section:nth-child(3n+2){z-index:2}
.flow>section:nth-child(3n){z-index:3}
.flow>section:hover{transform:translateY(-4px);box-shadow:var(--e3)}
.has-js .flow>section.in:hover{transform:translateY(-4px);box-shadow:var(--e3)}
.flow>section>:first-child{margin-top:0}
.flow h2{
  display:flex;
  align-items:baseline;
  gap:12px;
  margin:0 0 14px;
  font-size:clamp(1.28rem,2.3vw,1.82rem);
  font-weight:600;
  line-height:1.26;
  letter-spacing:-.02em;
}
.flow h2::before{
  content:counter(sec,decimal-leading-zero);
  font-size:.68em;
  font-weight:500;
  color:#b8b8b8;
  letter-spacing:0;
}
.flow h3{
  margin:1.4em 0 .6em;
  font-size:1.1rem;
  font-weight:600;
  letter-spacing:-.01em;
}
.flow p{margin:0 0 1em;line-height:1.85;color:var(--ink-2)}
.flow p:last-child,.flow ul:last-child,.flow ol:last-child{margin-bottom:0}
.flow ul,.flow ol{margin:0 0 1em;padding-left:1.25em;line-height:1.8;color:var(--ink-2)}
.flow li{margin:.35em 0}
.flow a{color:var(--ink);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.flow a:hover{text-decoration-thickness:2px}
.flow img{display:block;max-width:100%;height:auto;margin:1.1em 0;border-radius:8px;border:1px solid var(--line)}
.flow figure{margin:1.2em 0}
.flow figcaption{font-size:.82rem;color:var(--ink-3);margin-top:6px}
.flow blockquote{
  margin:1.2em 0;
  padding:14px 0 14px 20px;
  border-left:3px solid var(--ink);
  color:var(--ink-2);
  background:linear-gradient(90deg,rgba(245,245,245,.9),rgba(245,245,245,0));
}
.flow table{width:100%;border-collapse:collapse;margin:1.2em 0;font-size:.94rem}
.flow th,.flow td{border:1px solid var(--line);padding:10px 12px;text-align:left}
.flow th{background:var(--paper-2);font-weight:600}
.flow hr{border:0;border-top:1px solid var(--line);margin:1.6em 0}
.flow aside{
  margin:1.2em 0;
  padding:16px 18px;
  border:1px dashed var(--line);
  border-radius:var(--r);
  background:var(--paper-2);
  font-size:.95rem;
}

/* ---------- 页脚 ---------- */
.foot{
  position:relative;
  z-index:5;
  background:var(--ink);
  color:var(--paper-2);
  padding:clamp(32px,5vw,58px) clamp(16px,4vw,48px) clamp(22px,3vw,34px);
  box-shadow:0 -18px 50px rgba(31,31,31,.16);
}
.foot-grid{
  max-width:var(--maxw);
  margin:0 auto;
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(14px,3vw,40px);
  padding-bottom:clamp(16px,3vw,26px);
  border-bottom:1px solid rgba(255,255,255,.16);
}
.foot dl{margin:0}
.foot dt{
  margin:0 0 6px;
  font-size:.72rem;
  letter-spacing:.18em;
  color:rgba(255,255,255,.52);
}
.foot dd{margin:0;font-size:.92rem;line-height:1.65;color:rgba(255,255,255,.9)}
.foot-links{display:flex;flex-wrap:wrap;gap:0 14px}
.foot-links a{
  display:inline-block;
  min-height:40px;
  padding:8px 0;
  font-size:.88rem;
  color:rgba(255,255,255,.88);
  text-decoration:none;
}
.foot-links a:hover{color:#fff;text-decoration:underline;text-underline-offset:3px}
.foot-brand{
  max-width:var(--maxw);
  margin:clamp(14px,3vw,26px) auto 0;
  font-size:clamp(2.1rem,12.4vw,7.6rem);
  font-weight:600;
  line-height:.95;
  letter-spacing:-.045em;
  color:rgba(255,255,255,.93);
  word-break:break-word;
}
.foot-copy{
  max-width:var(--maxw);
  margin:12px auto 0;
  font-size:.8rem;
  letter-spacing:.05em;
  color:rgba(255,255,255,.48);
}

/* ---------- 回到顶部 ---------- */
.totop{
  position:fixed;
  right:clamp(12px,3vw,28px);
  bottom:clamp(12px,3vw,26px);
  z-index:80;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:0 16px;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(255,255,255,.92);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  box-shadow:var(--e4);
  color:var(--ink);
  font-size:.84rem;
  letter-spacing:.04em;
  text-decoration:none;
  transition:transform .2s ease,box-shadow .2s ease;
}
.totop:hover{transform:translateY(-2px);box-shadow:var(--e4)}

/* ---------- 滚动浮现 ---------- */
.has-js .flow>section,.has-js .rail-inner{
  opacity:0;
  transform:translateY(22px);
  transition:opacity .6s ease,transform .6s cubic-bezier(.2,.7,.3,1);
}
.has-js .flow>section.in,.has-js .rail-inner.in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:900px){
  .stage{grid-template-columns:minmax(0,1fr);gap:22px}
  .rail{position:static;top:auto}
  .rail-inner{padding:16px 16px 6px;box-shadow:var(--e2)}
  .flow>section:nth-child(even){margin-left:0}
  .flow>section{scroll-margin-top:170px}
}
@media (max-width:700px){
  .brandrow{padding-top:6px;padding-bottom:6px}
  .find{flex:1 1 100%}
  .find input{width:100%}
  .foot-grid{grid-template-columns:minmax(0,1fr);gap:14px}
  .hero{min-height:92vh;min-height:92svh;padding-top:64px}
  .hero::after{height:56px}
}
@media (max-width:420px){
  .menu>li>a{padding:11px 10px;font-size:.9rem}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .hero-inner{animation:none}
  .has-js .flow>section,.has-js .rail-inner{opacity:1;transform:none;transition:none}
  .flow>section,.rail-list a,.totop,.find button{transition:none}
  .hero-figure img{transform:none}
}

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