:root{
  --paper:#ffffff;
  --mist:#f5f5f5;
  --mist-2:#ededed;
  --ink:#1f1f1f;
  --ink-soft:#4b4b4b;
  --ink-mute:#8c8c8c;
  --line:#e7e7e7;
  --r-xl:24px;
  --r:16px;
  --r-s:4px;
  --sh:0 4px 6px rgba(0,0,0,.05),0 14px 34px rgba(0,0,0,.06);
  --sh-hi:0 8px 14px rgba(0,0,0,.07),0 22px 48px rgba(0,0,0,.12);
  --ff:'Lexend','Source Sans 3','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,-apple-system,'Segoe UI',sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--mist);
  color:var(--ink);
  font-family:var(--ff);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
}
img{max-width:100%;height:auto}
a{color:inherit}
.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}
:focus-visible{outline:2px solid var(--ink);outline-offset:3px;border-radius:var(--r-s)}

/* ---------- 顶栏 ---------- */
.site-head{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(255,255,255,.93);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
  transition:box-shadow .25s ease;
}
.site-head.is-stuck{box-shadow:0 8px 22px rgba(0,0,0,.07)}
.head-row{padding:0 18px}
.head-brandrow{display:flex;align-items:center;min-height:58px}
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:6px 0;
  text-decoration:none;
  color:var(--ink);
  font-weight:600;
}
.brand img{width:34px;height:34px;border-radius:11px;object-fit:cover;display:block}
.brand-text{font-size:18px;letter-spacing:.02em}
.head-bar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding-top:2px;
  padding-bottom:11px;
}
.menu-btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:0 18px;
  border:1px solid var(--line);
  border-radius:var(--r-s);
  background:var(--paper);
  color:var(--ink);
  font:inherit;
  font-size:16px;
  cursor:pointer;
  transition:background .2s ease,transform .2s ease,box-shadow .2s ease;
}
.menu-btn:hover{background:var(--mist);box-shadow:var(--sh)}
.menu-icon{position:relative;width:16px;height:2px;background:currentColor;border-radius:2px}
.menu-icon::before,.menu-icon::after{content:"";position:absolute;left:0;width:16px;height:2px;background:currentColor;border-radius:2px}
.menu-icon::before{top:-5px}
.menu-icon::after{top:5px}
.contact-chip{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 20px;
  border-radius:var(--r-s);
  background:var(--ink);
  color:#fff;
  text-decoration:none;
  font-size:16px;
  transition:transform .2s ease,box-shadow .2s ease;
}
.contact-chip:hover{transform:translateY(-1px);box-shadow:var(--sh-hi)}

/* ---------- 左侧全屏导航 ---------- */
.nav-drawer{
  position:fixed;
  inset:0;
  z-index:90;
  display:flex;
  flex-direction:column;
  padding:18px 18px 36px;
  background:var(--paper);
  overflow-y:auto;
  visibility:hidden;
  opacity:0;
  transform:translateX(-2.5%);
  transition:opacity .3s ease,transform .3s ease,visibility .3s ease;
}
body.nav-open .nav-drawer{visibility:visible;opacity:1;transform:none}
body.nav-open{overflow:hidden}
.drawer-bar{display:flex;align-items:center;justify-content:space-between;gap:16px;border-bottom:1px solid var(--line);padding-bottom:14px}
.drawer-title{font-weight:600;font-size:18px}
.drawer-close{
  min-height:44px;
  padding:0 18px;
  border:1px solid var(--line);
  border-radius:var(--r-s);
  background:var(--mist);
  color:var(--ink);
  font:inherit;
  font-size:16px;
  cursor:pointer;
}
.drawer-close:hover{background:var(--mist-2)}
.drawer-nav{margin-top:22px}
.drawer-nav ul{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.drawer-nav a{
  display:flex;
  align-items:center;
  gap:14px;
  min-height:56px;
  padding:12px 18px;
  border-radius:var(--r);
  background:var(--mist);
  color:var(--ink);
  text-decoration:none;
  font-size:17px;
  transition:background .2s ease,transform .2s ease;
}
.drawer-nav a:hover{background:var(--mist-2);transform:translateX(4px)}
.idx{font-style:normal;font-size:13px;color:var(--ink-mute);font-variant-numeric:tabular-nums;letter-spacing:.08em}

/* ---------- 首屏 ---------- */
main{display:block}
main div{display:block;padding:0 0 10px}
.hero{
  position:relative;
  width:100%;
  min-height:100vh;
  min-height:100svh;
  display:grid;
  place-items:center;
  overflow:hidden;
  margin:0 0 20px;
  padding:150px 20px 110px;
  text-align:center;
  color:#fff;
  border-radius:0 0 var(--r-xl) var(--r-xl);
  background:linear-gradient(155deg,#1f1f1f 0%,#3c3c3c 55%,#151515 100%);
}
.hero-plain{background:linear-gradient(155deg,#1f1f1f 0%,#4a4a4a 50%,#131313 100%)}
.hero-media{position:absolute;inset:0;z-index:0}
.hero-media img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  opacity:0;
  transition:opacity 1.2s ease;
}
.hero-media img.is-on{opacity:1}
.hero-veil{
  position:absolute;
  inset:0;
  z-index:1;
  background:linear-gradient(180deg,rgba(14,14,14,.6) 0%,rgba(14,14,14,.42) 45%,rgba(14,14,14,.8) 100%);
}
.hero-copy{position:relative;z-index:2;max-width:800px}
.hero-badge{
  display:inline-block;
  margin:0 0 18px;
  padding:7px 15px;
  border-radius:var(--r-s);
  border:1px solid rgba(255,255,255,.34);
  background:rgba(255,255,255,.16);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  color:#fff;
  font-size:13.5px;
  letter-spacing:.1em;
}
.hero h1{
  margin:0;
  font-size:clamp(28px,7vw,56px);
  line-height:1.26;
  font-weight:600;
  letter-spacing:-.01em;
  text-wrap:balance;
}
.hero-hint{
  position:absolute;
  left:50%;
  bottom:26px;
  z-index:2;
  transform:translateX(-50%);
  font-size:13px;
  letter-spacing:.18em;
  color:rgba(255,255,255,.82);
}
.hero-hint::after{
  content:"";
  display:block;
  width:1px;
  height:26px;
  margin:8px auto 0;
  background:linear-gradient(180deg,rgba(255,255,255,.8),rgba(255,255,255,0));
}

/* ---------- 正文卡片 ---------- */
main div > article:not(.hero){
  width:calc(100% - 32px);
  max-width:980px;
  margin:0 auto 18px;
  padding:26px 20px;
  background:var(--paper);
  border-radius:var(--r);
  box-shadow:var(--sh);
  scroll-margin-top:142px;
  transition:box-shadow .25s ease,transform .25s ease;
}
main div > article:not(.hero):hover{box-shadow:var(--sh-hi)}
div > article > small,
.foot-cell > small{
  display:inline-block;
  margin:0 0 10px;
  color:var(--ink-mute);
  font-size:12.5px;
  letter-spacing:.16em;
}
div > article h2{
  margin:0 0 .55em;
  font-size:clamp(21px,3.6vw,29px);
  line-height:1.32;
  font-weight:600;
  letter-spacing:-.01em;
}
div > article h3{margin:1.5em 0 .5em;font-size:19px;line-height:1.45;font-weight:600}
div > article p{margin:0 0 1.05em;color:var(--ink-soft)}
div > article p:last-child{margin-bottom:0}
div > article ul,div > article ol{margin:0 0 1.1em;padding-left:1.3em;color:var(--ink-soft)}
div > article li{margin:.35em 0}
div > article strong{color:var(--ink);font-weight:600}
div > article blockquote{
  margin:0 0 1.1em;
  padding:14px 18px;
  border-left:3px solid var(--ink);
  background:var(--mist);
  border-radius:0 var(--r-s) var(--r-s) 0;
  color:var(--ink-soft);
}
div > article table{width:100%;border-collapse:collapse;font-size:16px}
div > article th,div > article td{border-bottom:1px solid var(--line);padding:10px 8px;text-align:left}
div > article a{color:var(--ink);text-underline-offset:3px}

/* ---------- 页脚 ---------- */
.site-foot{
  margin-top:28px;
  padding:30px 18px 22px;
  display:grid;
  gap:22px;
  background:var(--paper);
  border-top:1px solid var(--line);
  border-radius:var(--r-xl) var(--r-xl) 0 0;
}
.foot-cell h2{margin:0 0 .7em;font-size:20px;line-height:1.35;font-weight:600}
.foot-cell p{margin:0 0 1em;color:var(--ink-soft);font-size:16px}
.foot-map ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:4px 12px}
.foot-map a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:4px 0;
  text-decoration:none;
  color:var(--ink-soft);
  font-size:16px;
  border-bottom:1px solid var(--line);
  transition:color .2s ease;
}
.foot-map a:hover{color:var(--ink)}
.foot-form{display:flex;gap:8px;flex-wrap:wrap;margin-top:4px}
.foot-form input{
  flex:1 1 160px;
  min-height:44px;
  padding:0 14px;
  border:1px solid var(--line);
  border-radius:var(--r-s);
  background:var(--mist);
  color:var(--ink);
  font:inherit;
  font-size:16px;
}
.foot-form button{
  min-height:44px;
  padding:0 20px;
  border:0;
  border-radius:var(--r-s);
  background:var(--ink);
  color:#fff;
  font:inherit;
  font-size:16px;
  cursor:pointer;
  transition:transform .2s ease,box-shadow .2s ease;
}
.foot-form button:hover{transform:translateY(-1px);box-shadow:var(--sh)}
.foot-host{font-size:15px;color:var(--ink-mute);word-break:break-all}
.foot-cta{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 20px;
  border-radius:var(--r-s);
  background:var(--mist);
  color:var(--ink);
  text-decoration:none;
  font-size:16px;
}
.foot-cta:hover{background:var(--mist-2)}
.foot-bottom{
  grid-column:1 / -1;
  padding-top:16px;
  border-top:1px solid var(--line);
  text-align:center;
}
.foot-bottom p{margin:0;font-size:14px;color:var(--ink-mute)}

/* ---------- 断点 ---------- */
@media (min-width:640px){
  .head-row{padding:0 26px}
  main div > article:not(.hero){padding:34px 30px;border-radius:var(--r-xl)}
  .site-foot{padding:40px 26px 24px;gap:26px}
}
@media (min-width:900px){
  body{font-size:18px}
  .nav-drawer{padding:34px max(40px,7vw) 52px}
  .drawer-bar,.drawer-nav{width:100%;max-width:760px;margin-left:auto;margin-right:auto}
  .drawer-nav{margin-top:30px}
  .drawer-nav ul{grid-template-columns:1fr 1fr;gap:14px}
  main div > article:not(.hero){padding:44px 48px;margin-bottom:24px}
  .site-foot{
    grid-template-columns:1.25fr 1fr 1fr;
    align-items:start;
    padding:52px max(40px,7vw) 26px;
    gap:34px;
  }
  .foot-bottom{justify-self:stretch}
  .hero{padding-top:190px}
}
@media (hover:hover){
  main div > article:not(.hero):hover{transform:translateY(-2px)}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none!important;animation:none!important}
  main div > article:not(.hero):hover{transform:none}
}

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