/* ===== 自托管字体（本地 fonts/ 目录，由 download_fonts.py 生成） ===== */
@font-face{font-family:"Noto Sans SC";font-style:normal;font-weight:300;font-display:swap;src:url("fonts/NotoSansSC-300.woff2") format("woff2");}
@font-face{font-family:"Noto Sans SC";font-style:normal;font-weight:400;font-display:swap;src:url("fonts/NotoSansSC-400.woff2") format("woff2");}
@font-face{font-family:"Noto Sans SC";font-style:normal;font-weight:500;font-display:swap;src:url("fonts/NotoSansSC-500.woff2") format("woff2");}
@font-face{font-family:"Noto Sans SC";font-style:normal;font-weight:700;font-display:swap;src:url("fonts/NotoSansSC-700.woff2") format("woff2");}
@font-face{font-family:"Noto Sans SC";font-style:normal;font-weight:900;font-display:swap;src:url("fonts/NotoSansSC-900.woff2") format("woff2");}

@font-face{font-family:"Sora";font-style:normal;font-weight:400;font-display:swap;src:url("fonts/Sora-400.woff2") format("woff2");}
@font-face{font-family:"Sora";font-style:normal;font-weight:500;font-display:swap;src:url("fonts/Sora-500.woff2") format("woff2");}
@font-face{font-family:"Sora";font-style:normal;font-weight:600;font-display:swap;src:url("fonts/Sora-600.woff2") format("woff2");}
@font-face{font-family:"Sora";font-style:normal;font-weight:700;font-display:swap;src:url("fonts/Sora-700.woff2") format("woff2");}
@font-face{font-family:"Sora";font-style:normal;font-weight:800;font-display:swap;src:url("fonts/Sora-800.woff2") format("woff2");}

@font-face{font-family:"Space Grotesk";font-style:normal;font-weight:400;font-display:swap;src:url("fonts/SpaceGrotesk-400.woff2") format("woff2");}
@font-face{font-family:"Space Grotesk";font-style:normal;font-weight:500;font-display:swap;src:url("fonts/SpaceGrotesk-500.woff2") format("woff2");}
@font-face{font-family:"Space Grotesk";font-style:normal;font-weight:600;font-display:swap;src:url("fonts/SpaceGrotesk-600.woff2") format("woff2");}
@font-face{font-family:"Space Grotesk";font-style:normal;font-weight:700;font-display:swap;src:url("fonts/SpaceGrotesk-700.woff2") format("woff2");}

:root{
  --bg:#05070c;
  --bg-2:#080c14;
  --surface:rgba(255,255,255,.045);
  --surface-2:rgba(255,255,255,.07);
  --border:rgba(255,255,255,.09);
  --border-strong:rgba(255,255,255,.16);
  --text:#e9edf3;
  --muted:#8a93a3;
  --muted-2:#5d6675;
  --green:#2fe3a0;
  --cyan:#38bdf8;
  --violet:#7c5cff;
  --grad:linear-gradient(120deg,#2fe3a0 0%,#38bdf8 55%,#7c5cff 100%);
  --maxw:1180px;
  --r:18px;
  --font-cn:"Noto Sans SC",-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --font-en:"Sora","Space Grotesk",-apple-system,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-cn);
  background:var(--bg);
  color:var(--text);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%}
::selection{background:rgba(47,227,160,.3);color:#fff}

/* ---------- background layers ---------- */
.bg-grid{
  position:fixed;inset:0;z-index:-4;
  background-image:
    linear-gradient(rgba(255,255,255,.025) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.025) 1px,transparent 1px);
  background-size:64px 64px;
  -webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 0%,#000 30%,transparent 75%);
  mask-image:radial-gradient(ellipse 80% 60% at 50% 0%,#000 30%,transparent 75%);
}
.bg-orb{position:fixed;z-index:-3;border-radius:50%;filter:blur(90px);opacity:.5;pointer-events:none}
.bg-orb--1{width:520px;height:520px;top:-160px;left:-120px;background:radial-gradient(circle,#0c5a47,transparent 70%)}
.bg-orb--2{width:600px;height:600px;top:30%;right:-200px;background:radial-gradient(circle,#113a63,transparent 70%)}
#net{position:fixed;inset:0;z-index:-2;width:100%;height:100%;opacity:.55;pointer-events:none}
.bg-noise{
  position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.035;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- nav ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:50;
  display:flex;align-items:center;justify-content:space-between;
  gap:24px;padding:16px clamp(18px,4vw,44px);
  transition:background .3s,border-color .3s,backdrop-filter .3s;
  border-bottom:1px solid transparent;
}
.nav.is-scrolled{
  background:rgba(5,7,12,.72);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--border);
}
.nav__brand{display:flex;align-items:center;gap:11px}
.nav__logo{height:32px;width:auto;filter:drop-shadow(0 0 8px rgba(47,227,160,.35))}
.nav__name{font-family:var(--font-en);font-weight:700;font-size:19px;letter-spacing:1px;line-height:1}
.nav__links{display:flex;gap:30px}
.nav__links a{font-size:14.5px;color:var(--muted);position:relative;transition:color .25s}
.nav__links a::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:2px;background:var(--grad);transition:width .25s;border-radius:2px}
.nav__links a:hover{color:var(--text)}
.nav__links a:hover::after{width:100%}
.nav__cta{font-size:13.5px;padding:9px 18px}
.nav__toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.nav__toggle span{width:24px;height:2px;background:var(--text);border-radius:2px;transition:.3s}
.nav__toggle.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav__toggle.is-open span:nth-child(2){opacity:0}
.nav__toggle.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--font-cn);font-weight:500;font-size:15px;
  padding:13px 26px;border-radius:999px;cursor:pointer;border:1px solid transparent;
  transition:transform .2s,box-shadow .3s,background .3s,border-color .3s;white-space:nowrap}
.btn--primary{background:var(--grad);color:#04140e;font-weight:700;
  box-shadow:0 8px 30px -8px rgba(47,227,160,.5)}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 14px 40px -10px rgba(56,189,248,.6)}
.btn--ghost{background:var(--surface);border-color:var(--border-strong);color:var(--text)}
.btn--ghost:hover{background:var(--surface-2);border-color:var(--green);transform:translateY(-2px)}

/* ---------- hero ---------- */
.hero{min-height:100vh;display:flex;flex-direction:column;justify-content:center;align-items:center;
  text-align:center;padding:120px clamp(18px,4vw,44px) 90px;position:relative}
.hero__inner{max-width:880px}
.eyebrow{font-family:var(--font-en);font-size:13px;letter-spacing:2px;text-transform:uppercase;
  color:var(--muted);margin-bottom:22px}
.eyebrow::before{content:"";display:inline-block;width:26px;height:1px;background:var(--green);
  vertical-align:middle;margin-right:12px}
.hero__title{font-family:var(--font-en);font-weight:800;font-size:clamp(64px,13vw,148px);
  line-height:.95;letter-spacing:2px;margin-bottom:18px}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;
  filter:drop-shadow(0 6px 40px rgba(47,227,160,.25))}
.hero__tag{font-size:clamp(20px,3.4vw,30px);font-weight:500;color:var(--text);margin-bottom:22px;letter-spacing:1px}
.hero__desc{color:var(--muted);font-size:clamp(15px,2vw,18px);max-width:620px;margin:0 auto 30px}
.hero__tags{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-bottom:38px}
.chip{font-size:13px;padding:7px 15px;border-radius:999px;border:1px solid var(--border-strong);
  background:var(--surface);color:var(--muted);letter-spacing:.5px}
.hero__actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero__scroll{position:absolute;bottom:30px;left:50%;transform:translateX(-50%);
  font-size:11px;letter-spacing:2px;color:var(--muted);text-transform:uppercase;
  display:flex;flex-direction:column;align-items:center;gap:10px}
.hero__scroll span{width:1px;height:42px;background:linear-gradient(var(--green),transparent);
  animation:scrollPulse 2s infinite}
@keyframes scrollPulse{0%,100%{opacity:.3;transform:scaleY(.6)}50%{opacity:1;transform:scaleY(1)}}

/* ---------- sections ---------- */
.section{max-width:var(--maxw);margin:0 auto;padding:clamp(70px,9vw,120px) clamp(18px,4vw,44px)}
.section--alt{position:relative}
.section--alt::before{content:"";position:absolute;inset:0;z-index:-1;
  background:linear-gradient(180deg,rgba(255,255,255,.02),transparent)}
.section__head{margin-bottom:52px;max-width:760px}
.kicker{font-family:var(--font-en);font-size:13px;letter-spacing:2px;color:var(--green);
  text-transform:uppercase;display:block;margin-bottom:16px}
.section__head h2{font-size:clamp(28px,4.6vw,46px);font-weight:700;line-height:1.2;letter-spacing:.5px}
.section__sub{color:var(--muted);margin-top:18px;font-size:16px}

/* ---------- about ---------- */
.about{display:grid;grid-template-columns:1.2fr 1fr;gap:48px;align-items:start}
.about__lead p{font-size:17px;color:#cdd4de}
.about__lead strong{color:var(--text);font-weight:600}
.about__quote{margin-top:26px;font-family:var(--font-en);font-style:italic;font-size:20px;
  color:var(--green);border-left:2px solid var(--green);padding-left:18px}
.about__meta{display:grid;gap:14px}
.meta-card{background:var(--surface);border:1px solid var(--border);border-radius:14px;
  padding:16px 18px;backdrop-filter:blur(6px);transition:border-color .3s,transform .3s}
.meta-card:hover{border-color:var(--border-strong);transform:translateX(4px)}
.meta-card__k{display:block;font-size:12px;color:var(--muted);letter-spacing:1px;margin-bottom:6px}
.meta-card__v{display:block;font-size:15px;color:var(--text);font-weight:500;word-break:break-all}

/* ---------- grid & cards ---------- */
.grid{display:grid;gap:20px}
.grid--3{grid-template-columns:repeat(3,1fr)}
.grid--2{grid-template-columns:repeat(2,1fr)}
.card{position:relative;background:var(--surface);border:1px solid var(--border);
  border-radius:var(--r);padding:30px 26px;overflow:hidden;
  transition:transform .35s,border-color .35s,background .35s}
.card::before{content:"";position:absolute;inset:0;border-radius:var(--r);
  background:radial-gradient(420px circle at var(--mx,50%) var(--my,0%),rgba(47,227,160,.10),transparent 60%);
  opacity:0;transition:opacity .35s}
.card:hover{transform:translateY(-6px);border-color:var(--border-strong);background:var(--surface-2)}
.card:hover::before{opacity:1}
.card__icon{font-size:30px;width:58px;height:58px;display:grid;place-items:center;
  border-radius:14px;background:rgba(47,227,160,.08);border:1px solid var(--border);margin-bottom:20px}
.card h3{font-size:19px;font-weight:600;margin-bottom:12px;letter-spacing:.3px}
.card p{color:var(--muted);font-size:14.5px}

/* ---------- IoT ---------- */
.iot{display:grid;gap:44px}
.iot__flow{display:flex;align-items:stretch;justify-content:space-between;gap:0;flex-wrap:wrap}
.flow-node{flex:1;min-width:150px;background:var(--surface);border:1px solid var(--border);
  border-radius:14px;padding:22px 18px;text-align:center;position:relative;transition:border-color .3s}
.flow-node:hover{border-color:var(--green)}
.flow-node__dot{width:11px;height:11px;border-radius:50%;background:var(--green);
  display:block;margin:0 auto 14px;box-shadow:0 0 14px var(--green)}
.flow-node b{display:block;font-size:16px;margin-bottom:6px}
.flow-node small{color:var(--muted);font-size:12.5px;display:block}
.flow-line{flex:0 0 36px;align-self:center;height:1px;position:relative;
  background:linear-gradient(90deg,var(--green),var(--cyan))}
.flow-line::after{content:"";position:absolute;right:-1px;top:50%;transform:translateY(-50%);
  border:5px solid transparent;border-left-color:var(--cyan)}
.iot__points{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.point{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:22px 20px}
.point span{font-family:var(--font-en);font-weight:600;font-size:15px;color:var(--cyan);display:block;margin-bottom:10px}
.point p{color:var(--muted);font-size:14px}

/* ---------- AI ---------- */
.ai{display:grid;grid-template-columns:1fr 1.25fr;gap:34px}
.ai__lab{background:linear-gradient(160deg,rgba(47,227,160,.07),rgba(56,189,248,.04));
  border:1px solid var(--border-strong);border-radius:var(--r);padding:32px}
.lab-tag{display:inline-block;font-family:var(--font-en);font-size:12px;letter-spacing:2px;
  text-transform:uppercase;color:#04140e;background:var(--grad);font-weight:700;
  padding:6px 14px;border-radius:999px;margin-bottom:24px}
.lab-list{list-style:none;display:grid;gap:18px}
.lab-list li{border-top:1px solid var(--border);padding-top:16px}
.lab-list b{display:block;font-size:16px;margin-bottom:5px}
.lab-list span{color:var(--muted);font-size:14px}
.ai__apps{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.app-card{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:24px 22px;
  transition:transform .3s,border-color .3s}
.app-card:hover{transform:translateY(-5px);border-color:var(--border-strong)}
.app-card h4{font-size:17px;margin-bottom:9px}
.app-card p{color:var(--muted);font-size:14px}

/* ---------- insight ---------- */
.insight{background:var(--surface);border:1px solid var(--border);border-radius:var(--r);
  padding:32px 28px;position:relative;overflow:hidden;transition:border-color .3s,transform .3s}
.insight:hover{border-color:var(--border-strong);transform:translateY(-5px)}
.insight__num{font-family:var(--font-en);font-weight:800;font-size:46px;line-height:1;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;margin-bottom:16px}
.insight__num small{font-size:20px;-webkit-text-fill-color:var(--muted);margin-left:4px}
.insight h4{font-size:18px;margin-bottom:12px}
.insight p{color:var(--muted);font-size:14.5px;margin-bottom:14px}
.insight__src{font-size:12px;color:var(--muted-2);letter-spacing:.5px;
  border-top:1px solid var(--border);padding-top:12px;display:block}
.insight__note{margin-top:28px;color:var(--muted);font-size:15px;max-width:820px;
  border-left:2px solid var(--cyan);padding-left:18px}

/* ---------- research ---------- */
.research{background:var(--surface);border:1px dashed var(--border-strong);border-radius:var(--r);
  padding:40px;max-width:880px}
.research p{font-size:16px;color:#cdd4de}
.research__soon{margin-top:14px;color:var(--muted);font-family:var(--font-en);letter-spacing:.5px;font-size:14px}

/* ---------- contact ---------- */
.contact{display:block;max-width:680px}
.contact__info{display:grid;gap:14px}
.contact__row{display:flex;gap:18px;align-items:baseline;background:var(--surface);
  border:1px solid var(--border);border-radius:14px;padding:18px 22px;transition:border-color .3s,transform .3s}
.contact__row:hover{border-color:var(--green);transform:translateX(4px)}
.contact__k{font-family:var(--font-en);font-size:12px;letter-spacing:2px;text-transform:uppercase;
  color:var(--muted);min-width:54px}
.contact__v{font-size:16px;font-weight:500}
.contact__cta{background:linear-gradient(160deg,rgba(56,189,248,.07),rgba(124,92,255,.05));
  border:1px solid var(--border-strong);border-radius:var(--r);padding:34px;
  display:flex;flex-direction:column;justify-content:center;gap:22px}
.contact__cta p{font-size:16px;color:#cdd4de}
.contact__intro{margin-bottom:4px}
.cform{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.cform__row{display:grid;gap:8px}
.cform__row--full{grid-column:1 / -1}
.cform__label{font-size:13px;color:var(--muted);letter-spacing:.5px}
.cform__input{width:100%;background:rgba(255,255,255,.04);border:1px solid var(--border-strong);
  border-radius:12px;padding:13px 15px;color:var(--text);font-family:var(--font-cn);font-size:15px;
  transition:border-color .25s,box-shadow .25s;resize:vertical}
.cform__input::placeholder{color:var(--muted-2)}
.cform__input:focus{outline:none;border-color:var(--green);
  box-shadow:0 0 0 3px rgba(47,227,160,.15)}
.cform__actions{grid-column:1 / -1;display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-top:2px}
.cform__hint{font-size:12.5px;color:var(--muted-2);letter-spacing:.3px}

/* ---------- footer ---------- */
.footer{border-top:1px solid var(--border);margin-top:40px;
  background:linear-gradient(180deg,transparent,rgba(255,255,255,.02))}
.footer__inner{max-width:var(--maxw);margin:0 auto;padding:48px clamp(18px,4vw,44px) 30px;
  display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap}
.footer__brand{display:flex;align-items:center;gap:12px}
.footer__logo{height:30px;width:auto;filter:drop-shadow(0 0 6px rgba(47,227,160,.3))}
.footer__text{display:flex;flex-direction:column;line-height:1.3}
.footer__name{font-family:var(--font-en);font-weight:700;font-size:20px}
.footer__brand p{color:var(--muted);font-size:13.5px;margin-top:4px}
.footer__nav{display:flex;gap:26px;flex-wrap:wrap;align-items:center}
.footer__nav a{color:var(--muted);font-size:14px;transition:color .25s}
.footer__nav a:hover{color:var(--text)}
.footer__bar{max-width:var(--maxw);margin:0 auto;padding:18px clamp(18px,4vw,44px);
  border-top:1px solid var(--border);display:flex;justify-content:space-between;gap:16px;
  flex-wrap:wrap;color:var(--muted-2);font-size:12.5px}
.footer__beian{max-width:var(--maxw);margin:0 auto;padding:14px clamp(18px,4vw,44px) 30px;
  display:flex;gap:22px;flex-wrap:wrap;align-items:center}
.beian{display:inline-flex;align-items:center;gap:7px;color:var(--muted-2);font-size:12.5px;
  letter-spacing:.3px;transition:color .25s}
.beian:hover{color:var(--text)}
.beian__icon{width:13px;height:13px;color:var(--green);flex:0 0 auto;opacity:.85}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s cubic-bezier(.2,.7,.2,1),transform .7s cubic-bezier(.2,.7,.2,1)}
.reveal.is-in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media(max-width:900px){
  .about,.ai,.contact{grid-template-columns:1fr}
  .grid--3{grid-template-columns:repeat(2,1fr)}
  .iot__points{grid-template-columns:repeat(2,1fr)}
  .ai__apps{grid-template-columns:1fr}
}
@media(max-width:720px){
  .nav__links,.nav__cta{display:none}
  .nav__toggle{display:flex}
  .nav__links.is-open{display:flex;position:absolute;top:100%;left:0;right:0;
    flex-direction:column;gap:0;background:rgba(5,7,12,.96);backdrop-filter:blur(14px);
    border-bottom:1px solid var(--border);padding:10px 0}
  .nav__links.is-open a{padding:14px clamp(18px,4vw,44px);border-top:1px solid var(--border)}
  .grid--3,.grid--2,.iot__points{grid-template-columns:1fr}
  .cform{grid-template-columns:1fr}
  .iot__flow{flex-direction:column}
  .flow-line{flex:0 0 30px;width:1px;align-self:center;background:linear-gradient(180deg,var(--green),var(--cyan))}
  .flow-line::after{right:50%;top:-1px;transform:translateX(50%);border:5px solid transparent;border-top-color:var(--cyan)}
}
@media(prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  .hero__scroll span{animation:none}
}