/* 星链CDN 营销主页模板
   目录结构：
   - index.html
   - css/style.css
   - js/main.js
   - img/*.svg
*/

:root{
  --bg: #070815;
  --bg2:#0b0c1f;
  --card:#0f1230cc;
  --card2:#0c0f27cc;
  --text:#e9ecff;
  --muted:#aab0d7;
  --line:#262a57;
  --primary:#7c5cff;
  --primary2:#27d6ff;
  --good:#2af5a2;
  --warn:#ffcc66;
  --shadow: 0 24px 70px rgba(0,0,0,.45);
  --radius: 18px;
  --radius2: 26px;
  --container: 1180px;
  --gap: 18px;
  --ease: cubic-bezier(.2,.8,.2,1);
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC","Hiragino Sans GB","Microsoft YaHei", Arial, "Noto Sans", sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 600px at 15% 10%, rgba(124,92,255,.35), transparent 60%),
              radial-gradient(900px 500px at 85% 15%, rgba(39,214,255,.25), transparent 60%),
              radial-gradient(900px 600px at 60% 90%, rgba(42,245,162,.12), transparent 60%),
              linear-gradient(180deg, var(--bg) 0%, var(--bg2) 100%);
  overflow-x:hidden;
}

a{color:inherit; text-decoration:none}
img{max-width:100%; display:block}

.container{
  width:min(var(--container), calc(100% - 44px));
  margin:0 auto;
}

.bg-orb{
  position: fixed;
  inset:auto;
  width: 520px;
  height: 520px;
  border-radius: 999px;
  filter: blur(60px);
  opacity: .35;
  z-index:-2;
  pointer-events:none;
}
.bg-orb--a{left:-180px; top:40px; background: radial-gradient(circle at 30% 30%, var(--primary), transparent 60%)}
.bg-orb--b{right:-200px; top:200px; background: radial-gradient(circle at 30% 30%, var(--primary2), transparent 60%)}
.bg-grid{
  position: fixed;
  inset:0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(closest-side at 50% 30%, rgba(0,0,0,.8), transparent);
  opacity:.55;
  z-index:-3;
  pointer-events:none;
}

/* Header */
.header{
  position: sticky;
  top:0;
  z-index:50;
  backdrop-filter: blur(14px);
  background: linear-gradient(180deg, rgba(7,8,21,.76), rgba(7,8,21,.45));
  border-bottom: 1px solid rgba(255,255,255,.06);
}
.header__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding: 14px 0;
  gap: 18px;
}

.brand{
  display:flex; align-items:center; gap:10px;
  user-select:none;
}
.brand__logo{width:34px; height:34px}
.brand__name{font-weight:800; letter-spacing:.5px}
.brand--footer .brand__logo{width:30px; height:30px}

.nav{
  display:flex;
  align-items:center;
  gap: 18px;
}
.nav__link{
  color: rgba(233,236,255,.86);
  font-size: 14px;
  padding: 10px 10px;
  border-radius: 12px;
  transition: background .2s var(--ease), color .2s var(--ease);
}
.nav__link:hover{
  background: rgba(255,255,255,.06);
  color: #fff;
}

.header__actions{display:flex; align-items:center; gap: 12px}
.iconbtn{
  appearance:none; border:none; background: rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.08);
  width: 44px; height: 44px;
  border-radius: 14px;
  display:grid; place-items:center;
  cursor:pointer;
  transition: transform .2s var(--ease), background .2s var(--ease);
}
.iconbtn:hover{transform: translateY(-1px); background: rgba(255,255,255,.08)}
.header__burger{display:none}
.header__burger span{
  display:block; width:18px; height:2px;
  background: rgba(233,236,255,.86);
  border-radius: 2px;
}
.header__burger span+span{margin-top:4px}

/* Buttons */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding: 10px 14px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.06);
  color: #fff;
  font-weight: 700;
  font-size: 14px;
  cursor:pointer;
  transition: transform .22s var(--ease), background .22s var(--ease), border-color .22s var(--ease);
}
.btn:hover{transform: translateY(-1px); background: rgba(255,255,255,.09); border-color: rgba(255,255,255,.18)}
.btn--primary{
  background: linear-gradient(135deg, rgba(124,92,255,1), rgba(39,214,255,1));
  border-color: rgba(255,255,255,.14);
  box-shadow: 0 14px 36px rgba(124,92,255,.25);
}
.btn--primary:hover{box-shadow: 0 18px 46px rgba(124,92,255,.32)}
.btn--ghost{
  background: rgba(255,255,255,.04);
}
.btn--lg{padding: 12px 16px; border-radius: 16px}
.btn--block{width:100%}

/* Mobile nav */
.mobile{display:none}
.mobile.is-open{display:block}
.mobile{
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  backdrop-filter: blur(10px);
}
.mobile__panel{
  position:absolute;
  right: 14px;
  top: 68px;
  width: min(360px, calc(100% - 28px));
  background: linear-gradient(180deg, rgba(15,18,48,.92), rgba(12,15,39,.88));
  border:1px solid rgba(255,255,255,.10);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 14px;
}
.mobile__top{
  display:flex; align-items:center; justify-content:space-between;
  margin-bottom: 8px;
}
.mobile__title{font-weight: 800; opacity:.95}
.x{
  position:relative;
  width:16px; height:16px;
}
.x::before,.x::after{
  content:"";
  position:absolute; inset:0;
  width:16px; height:2px; margin:auto;
  background: rgba(233,236,255,.86);
  border-radius: 2px;
  transform-origin:center;
}
.x::before{transform: rotate(45deg)}
.x::after{transform: rotate(-45deg)}
.mobile__link{
  display:block;
  padding: 12px 12px;
  border-radius: 14px;
  border:1px solid transparent;
  color: rgba(233,236,255,.9);
}
.mobile__link:hover{
  background: rgba(255,255,255,.06);
  border-color: rgba(255,255,255,.08);
}
.mobile__cta{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 10px;
}

/* Sections */
.section{padding: 82px 0}
.section--alt{
  background: linear-gradient(180deg, rgba(255,255,255,.02), rgba(255,255,255,0));
  border-top: 1px solid rgba(255,255,255,.05);
  border-bottom: 1px solid rgba(255,255,255,.05);
}
.section__head{max-width: 760px; margin: 0 auto 26px; text-align:center}
.section__title{margin:0; font-size: 34px; letter-spacing:.2px}
.section__desc{margin: 10px 0 0; color: var(--muted); line-height: 1.65; font-size: 15px}

/* Hero */
.hero{padding: 56px 0 20px}
.hero__grid{
  display:grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 28px;
  align-items:center;
}

.badge{
  display:inline-flex;
  align-items:center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 999px;
  border:1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.04);
  color: rgba(233,236,255,.88);
  font-weight: 700;
  font-size: 13px;
}
.badge__dot{
  width:10px; height:10px;
  border-radius: 999px;
  background: radial-gradient(circle, var(--good), rgba(42,245,162,.1));
  box-shadow: 0 0 0 6px rgba(42,245,162,.12);
}

.hero__title{
  font-size: 54px;
  line-height: 1.05;
  margin: 14px 0 10px;
  letter-spacing: -0.6px;
}
.hero__title strong{
  background: linear-gradient(135deg, var(--primary), var(--primary2));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.hero__subtitle{
  margin: 0 0 18px;
  color: var(--muted);
  line-height: 1.7;
  font-size: 16px;
}
.hero__cta{display:flex; gap: 12px; flex-wrap:wrap}

.stats{
  margin-top: 18px;
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.stat{
  padding: 14px 14px;
  background: rgba(255,255,255,.03);
  border:1px solid rgba(255,255,255,.08);
  border-radius: 16px;
}
.stat__num{
  font-weight: 900;
  font-size: 22px;
  letter-spacing:.2px;
}
.stat__label{
  margin-top: 4px;
  color: rgba(233,236,255,.78);
  font-size: 13px;
}

.logos{margin-top: 14px}
.logos__hint{color: rgba(233,236,255,.68); font-size: 13px; font-weight: 700}
.logos__items{display:flex; gap: 8px; flex-wrap:wrap; margin-top: 8px}
.pill{
  display:inline-flex;
  align-items:center;
  padding: 6px 10px;
  border-radius: 999px;
  border:1px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.03);
  color: rgba(233,236,255,.82);
  font-size: 12px;
  font-weight: 700;
}
.pill--soft{
  border-color: rgba(255,255,255,.10);
  background: rgba(255,255,255,.02);
}

.hero__art{
  position:relative;
  border-radius: var(--radius2);
  overflow: hidden;
  background: linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.01));
  border:1px solid rgba(255,255,255,.10);
  box-shadow: var(--shadow);
  min-height: 420px;
}
.hero__img{width:100%; height:100%; object-fit:cover}
.hero__card{
  position:absolute;
  width: min(280px, 78%);
  background: rgba(15,18,48,.78);
  border:1px solid rgba(255,255,255,.10);
  border-radius: 18px;
  box-shadow: 0 18px 46px rgba(0,0,0,.35);
  padding: 12px;
  backdrop-filter: blur(10px);
}
.hero__card--a{left: 14px; bottom: 16px}
.hero__card--b{right: 14px; top: 18px}
.hero__card--c{right: 14px; bottom: 98px}

.mini{display:flex; gap: 10px; align-items:center}
.mini__icon{width:34px; height:34px}
.mini__title{font-weight: 900; font-size: 14px}
.mini__sub{color: var(--muted); font-size: 12px; margin-top:2px}

.hero__quick{padding: 18px 0 0}
.quick{
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  padding: 14px;
  border-radius: 20px;
  border:1px solid rgba(255,255,255,.08);
  background: rgba(255,255,255,.03);
}
.quick__item{
  padding: 10px 12px;
  border-radius: 16px;
  background: rgba(255,255,255,.02);
  border:1px solid rgba(255,255,255,.06);
}
.quick__k{font-weight: 900}
.quick__v{color: var(--muted); margin-top: 4px; font-size: 13px}

/* Cards */
.cards{
  display:grid;
  gap: 14px;
}
.cards--3{grid-template-columns: repeat(3, 1fr)}
.card{
  border-radius: var(--radius);
  border:1px solid rgba(255,255,255,.10);
  background: linear-gradient(180deg, rgba(15,18,48,.72), rgba(12,15,39,.56));
  box-shadow: 0 14px 46px rgba(0,0,0,.25);
  padding: 18px 18px;
  position:relative;
  overflow:hidden;
}
.card::before{
  content:"";
  position:absolute;
  inset:-2px;
  background: radial-gradient(500px 220px at 30% 20%, rgba(124,92,255,.18), transparent 60%),
              radial-gradient(400px 240px at 85% 25%, rgba(39,214,255,.14), transparent 60%);
  opacity: .8;
  pointer-events:none;
}
.card>*{position:relative}
.card__icon{width:42px; height:42px}
.card__title{margin: 12px 0 8px; font-size: 18px}
.card__text{margin: 0 0 10px; color: var(--muted); line-height: 1.65; font-size: 14px}
.check{margin:0; padding-left: 18px; color: rgba(233,236,255,.82); line-height: 1.9; font-size: 13px}
.check li{margin: 2px 0}

/* Capability grid */
.grid{
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.grid__item{
  border-radius: 18px;
  border:1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.03);
  padding: 16px 16px;
}
.grid__item img{width:38px; height:38px}
.grid__item h3{margin: 10px 0 6px; font-size: 15px}
.grid__item p{margin:0; color: var(--muted); line-height:1.65; font-size: 13px}

/* Pricing */
.toggle{
  display:inline-flex;
  gap: 6px;
  border-radius: 999px;
  border:1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.03);
  padding: 6px;
  margin-top: 16px;
}
.toggle__btn{
  appearance:none;
  border:none;
  background: transparent;
  color: rgba(233,236,255,.78);
  font-weight: 900;
  font-size: 13px;
  padding: 10px 12px;
  border-radius: 999px;
  cursor:pointer;
  transition: background .2s var(--ease), color .2s var(--ease), transform .2s var(--ease);
}
.toggle__btn:hover{transform: translateY(-1px)}
.toggle__btn.is-active{
  background: linear-gradient(135deg, rgba(124,92,255,.95), rgba(39,214,255,.9));
  color: #fff;
}

.pricing{
  display:grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 22px;
}
.plan{
  border-radius: 22px;
  border:1px solid rgba(255,255,255,.10);
  background: linear-gradient(180deg, rgba(15,18,48,.70), rgba(12,15,39,.55));
  box-shadow: 0 14px 50px rgba(0,0,0,.28);
  padding: 18px;
  position:relative;
  overflow:hidden;
}
.plan__top{margin-bottom: 10px}
.plan__name{margin:0; font-size: 18px}
.plan__hint{margin: 6px 0 0; color: var(--muted); font-size: 13px}

.plan__price{
  display:flex;
  align-items:flex-end;
  gap: 6px;
  margin: 10px 0 12px;
}
.plan__currency{opacity:.9; font-weight: 900}
.plan__num{font-size: 44px; font-weight: 950; letter-spacing:-0.6px}
.plan__unit{color: var(--muted); font-weight: 800; padding-bottom: 7px}

.plan__list{
  margin: 0 0 14px;
  padding-left: 18px;
  color: rgba(233,236,255,.85);
  line-height: 1.9;
  font-size: 13px;
}
.plan--hot{
  border-color: rgba(39,214,255,.35);
  box-shadow: 0 18px 62px rgba(39,214,255,.14);
  transform: translateY(-6px);
}
.ribbon{
  position:absolute;
  right: 14px;
  top: 14px;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(39,214,255,.16);
  border:1px solid rgba(39,214,255,.28);
  color: rgba(233,236,255,.92);
  font-weight: 900;
  font-size: 12px;
}

/* Note */
.note{
  margin-top: 16px;
  display:flex;
  gap: 10px;
  align-items:flex-start;
  padding: 14px;
  border-radius: 18px;
  border:1px solid rgba(255,255,255,.08);
  background: rgba(255,255,255,.03);
}
.note__icon{
  width: 26px; height: 26px;
  display:grid; place-items:center;
  border-radius: 10px;
  background: rgba(255,255,255,.05);
  border:1px solid rgba(255,255,255,.08);
  font-weight: 900;
  color: rgba(233,236,255,.9);
}
.note__text{color: var(--muted); line-height:1.65; font-size: 13px}

/* Usecases */
.usecases{
  display:grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.uc{
  border-radius: 18px;
  border:1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.03);
  padding: 16px;
}
.uc h3{margin:0 0 8px}
.uc p{margin:0 0 10px; color: var(--muted); line-height:1.65}
.uc__tags{display:flex; gap: 8px; flex-wrap:wrap}

/* Map */
.map{
  border-radius: 24px;
  border:1px solid rgba(255,255,255,.10);
  background: linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.02));
  padding: 16px;
  position:relative;
  overflow:hidden;
  box-shadow: 0 20px 70px rgba(0,0,0,.35);
}
.map__img{
  width:100%;
  height:auto;
  opacity:.92;
}
.map__legend{
  display:flex;
  gap: 14px;
  flex-wrap:wrap;
  margin-top: 10px;
  justify-content:center;
}
.legend{
  display:flex; align-items:center; gap: 8px;
  color: rgba(233,236,255,.8);
  font-size: 13px;
  font-weight: 800;
}
.legend__dot{
  width:10px; height:10px; border-radius:999px;
  box-shadow: 0 0 0 6px rgba(255,255,255,.06);
}
.legend__dot--edge{background: rgba(39,214,255,.9)}
.legend__dot--dc{background: rgba(124,92,255,.95)}

.map__kpis{
  position:absolute;
  left: 16px;
  bottom: 16px;
  display:flex;
  gap: 10px;
  flex-wrap:wrap;
}
.kpi{
  border-radius: 16px;
  border:1px solid rgba(255,255,255,.10);
  background: rgba(15,18,48,.66);
  backdrop-filter: blur(10px);
  padding: 10px 12px;
  min-width: 140px;
}
.kpi__k{color: var(--muted); font-size: 12px; font-weight: 800}
.kpi__v{font-weight: 950; margin-top: 2px}

/* Quotes */
.quotes{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.quote{
  margin:0;
  border-radius: 18px;
  border:1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.03);
  padding: 16px;
}
.quote blockquote{
  margin:0;
  color: rgba(233,236,255,.86);
  line-height:1.7;
  font-size: 14px;
}
.quote figcaption{
  display:flex;
  gap: 10px;
  align-items:center;
  margin-top: 12px;
}
.quote img{width:40px; height:40px; border-radius: 999px; border:1px solid rgba(255,255,255,.12)}
.quote__name{font-weight: 900}
.quote__meta{color: var(--muted); font-size: 12px; margin-top:2px}

/* FAQ */
.faq{max-width: 880px; margin: 0 auto}
.qa{
  border-radius: 18px;
  border:1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.03);
  overflow:hidden;
}
.qa+ .qa{margin-top: 10px}
.qa__q{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 14px;
  padding: 16px;
  appearance:none;
  border:none;
  background: transparent;
  color: rgba(233,236,255,.92);
  cursor:pointer;
  font-weight: 900;
  font-size: 15px;
}
.qa__icon{
  width: 10px; height: 10px;
  border-right: 2px solid rgba(233,236,255,.82);
  border-bottom: 2px solid rgba(233,236,255,.82);
  transform: rotate(45deg);
  transition: transform .2s var(--ease);
}
.qa.is-open .qa__icon{transform: rotate(-135deg)}
.qa__a{
  max-height: 0;
  overflow:hidden;
  transition: max-height .26s var(--ease);
}
.qa__a p{
  margin: 0;
  padding: 0 16px 16px;
  color: var(--muted);
  line-height:1.75;
  font-size: 14px;
}

/* CTA */
.cta{
  padding: 78px 0;
  background: radial-gradient(900px 500px at 20% 30%, rgba(124,92,255,.24), transparent 60%),
              radial-gradient(900px 500px at 80% 20%, rgba(39,214,255,.20), transparent 60%),
              linear-gradient(180deg, rgba(255,255,255,.02), rgba(255,255,255,.00));
  border-top: 1px solid rgba(255,255,255,.05);
}
.cta__grid{
  display:grid;
  grid-template-columns: 1fr;
  gap: 14px;
  align-items:center;
  justify-items:center;
}
.cta__title{margin:0; font-size: 34px; letter-spacing:-0.4px}
.cta__desc{margin: 10px 0 14px; color: var(--muted); line-height:1.75}
.cta__channels{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.channel{
  border-radius: 18px;
  border:1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.03);
  padding: 14px;
}
.channel__k{color: var(--muted); font-weight: 900; font-size: 12px}
.channel__v{font-weight: 900; margin-top: 4px}

.form{
  border-radius: 24px;
  border:1px solid rgba(255,255,255,.10);
  background: linear-gradient(180deg, rgba(15,18,48,.70), rgba(12,15,39,.55));
  padding: 18px;
  box-shadow: 0 18px 70px rgba(0,0,0,.35);
}
.form__row{display:flex; flex-direction:column; gap: 8px; margin-bottom: 12px}
.form label{font-weight: 900; font-size: 13px; color: rgba(233,236,255,.88)}
.form input, .form textarea{
  width:100%;
  border-radius: 14px;
  border:1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.03);
  color: rgba(233,236,255,.92);
  padding: 12px 12px;
  outline:none;
  transition: border-color .2s var(--ease), background .2s var(--ease);
}
.form input:focus, .form textarea:focus{
  border-color: rgba(39,214,255,.45);
  background: rgba(255,255,255,.04);
}
.form textarea{resize: vertical}
.form__hint{margin: 10px 0 0; color: var(--muted); font-size: 12px; line-height:1.6}

/* Footer */
.footer{
  padding: 36px 0 18px;
  border-top: 1px solid rgba(255,255,255,.06);
  background: rgba(0,0,0,.18);
}
.footer__grid{
  display:grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 14px;
  align-items:start;
}
.footer__text{color: var(--muted); line-height:1.7; margin: 10px 0 0; max-width: 520px}
.footer__cols{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.footer__col a{
  display:block;
  color: rgba(233,236,255,.84);
  padding: 8px 10px;
  border-radius: 12px;
}
.footer__col a:hover{background: rgba(255,255,255,.05)}
.footer__h{font-weight: 950; margin: 2px 0 6px; color: rgba(233,236,255,.92)}
.footer__bottom{
  display:flex;
  align-items:center;
  justify-content:space-between;
  color: rgba(233,236,255,.65);
  padding-top: 14px;
  margin-top: 10px;
  border-top: 1px solid rgba(255,255,255,.06);
}
.backtop{
  width: 36px; height: 36px;
  border-radius: 12px;
  display:grid; place-items:center;
  background: rgba(255,255,255,.04);
  border:1px solid rgba(255,255,255,.08);
}
.backtop:hover{background: rgba(255,255,255,.06)}

/* Reveal animation */
.reveal{
  opacity:0;
  transform: translateY(10px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.reveal.is-visible{
  opacity:1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 980px){
  .nav{display:none}
  .header__burger{display:grid}
  .hero__grid{grid-template-columns: 1fr}
  .hero__title{font-size: 44px}
  .stats{grid-template-columns: 1fr 1fr 1fr}
  .quick{grid-template-columns: 1fr 1fr}
  .cards--3{grid-template-columns: 1fr}
  .grid{grid-template-columns: 1fr 1fr}
  .pricing{grid-template-columns: 1fr}
  .plan--hot{transform:none}
  .quotes{grid-template-columns: 1fr}
  .cta__grid{grid-template-columns: 1fr}
  .footer__grid{grid-template-columns: 1fr}
  .footer__cols{grid-template-columns: 1fr 1fr 1fr}
  .map__kpis{position:static; margin-top: 12px}
}
@media (max-width: 520px){
  .container{width: calc(100% - 28px)}
  .hero__title{font-size: 38px}
  .stats{grid-template-columns: 1fr}
  .quick{grid-template-columns: 1fr}
  .grid{grid-template-columns: 1fr}
  .usecases{grid-template-columns: 1fr}
  .footer__cols{grid-template-columns: 1fr 1fr}
}


/* Floating Support FAB */
.fab{
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 60;
  display:flex;
  flex-direction: row-reverse; /* button stays on the far right, panel opens to the left */
  align-items:flex-end;
  gap: 12px;
  pointer-events:none; /* allow only children */
}
.fab__btn{
  pointer-events:auto;
  width: 58px;
  height: 58px;
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,.14);
  background: linear-gradient(135deg, rgba(124,92,255,.92), rgba(39,214,255,.85));
  box-shadow: 0 18px 52px rgba(0,0,0,.35);
  display:grid;
  place-items:center;
  cursor:pointer;
  position:relative;
  transition: transform .22s var(--ease), box-shadow .22s var(--ease);
}
.fab__btn:hover{transform: translateY(-2px); box-shadow: 0 22px 66px rgba(0,0,0,.42)}
.fab__btn img{width:34px; height:34px; filter: drop-shadow(0 8px 18px rgba(0,0,0,.25))}
.fab__pulse{
  position:absolute;
  inset:-6px;
  border-radius: 22px;
  background: radial-gradient(circle at 30% 30%, rgba(255,255,255,.55), transparent 60%);
  opacity:.55;
  animation: fabPulse 2.6s var(--ease) infinite;
  z-index:-1;
}
@keyframes fabPulse{
  0%{transform: scale(.96); opacity:.45}
  55%{transform: scale(1.06); opacity:.15}
  100%{transform: scale(.96); opacity:.45}
}

.fab__panel{
  pointer-events:auto;
  width: min(340px, calc(100vw - 120px));
  border-radius: 20px;
  border:1px solid rgba(255,255,255,.12);
  background: linear-gradient(180deg, rgba(15,18,48,.92), rgba(12,15,39,.88));
  box-shadow: var(--shadow);
  overflow:hidden;
  transform-origin: 100% 100%;
  transform: translateY(8px) scale(.98);
  opacity: 0;
  visibility:hidden;
  transition: opacity .18s var(--ease), transform .18s var(--ease), visibility .18s var(--ease);
}
.fab__head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding: 12px 12px 10px;
  border-bottom: 1px solid rgba(255,255,255,.08);
  background: rgba(255,255,255,.03);
}
.fab__title{font-weight: 950; letter-spacing:.2px}
.fab__close{
  appearance:none;
  border:none;
  background: rgba(255,255,255,.04);
  border:1px solid rgba(255,255,255,.10);
  width: 40px; height: 40px;
  border-radius: 14px;
  display:grid; place-items:center;
  cursor:pointer;
}
.fab__close:hover{background: rgba(255,255,255,.06)}
.fab__body{padding: 12px}
.fab__item{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 16px;
  border:1px solid rgba(255,255,255,.08);
  background: rgba(255,255,255,.02);
}
.fab__item + .fab__item{margin-top: 10px}
.fab__k{color: var(--muted); font-weight: 900; font-size: 12px}
.fab__v{font-weight: 950}
.fab__cta{margin-top: 12px}
.fab__tip{
  margin-top: 10px;
  color: rgba(233,236,255,.64);
  font-size: 12px;
  line-height: 1.55;
}

/* Hover-to-open on desktop */
@media (hover: hover) and (pointer: fine){
  .fab:hover .fab__panel{
    opacity:1;
    visibility:visible;
    transform: translateY(0) scale(1);
  }
}

/* Programmatic open (mobile / click) */
.fab.is-open .fab__panel{
  opacity:1;
  visibility:visible;
  transform: translateY(0) scale(1);
}

/* Slightly smaller on very small screens */
@media (max-width: 520px){
  .fab{right: 12px; bottom: 12px}
  .fab__btn{width:54px; height:54px; border-radius: 16px}
}

/* Contact section tweaks (no form) */
.cta__channels--single{
  /* 3 个联系方式一行并排 */
  grid-template-columns: repeat(3, minmax(0, 1fr));
  max-width: 760px;
}
.cta__note{
  margin-top: 14px;
  display:flex;
  gap: 8px;
  flex-wrap:wrap;
}
@media (max-width: 520px){
  .cta__channels--single{grid-template-columns: 1fr;}
}

/* Contact section center layout */
.cta__copy--center{
  text-align: center;
  margin: 0 auto;
  max-width: 760px;
}
.cta__minihead{
  margin-top: 6px;
  font-weight: 950;
  letter-spacing: .2px;
  color: rgba(233,236,255,.92);
}
.cta__channels--single{
  margin: 14px auto 0;
  justify-items: stretch;
}
.cta__channels--single .channel{
  text-align:left;
}
@media (max-width: 520px){
  .cta__channels--single .channel{ text-align:left; }
}