:root{
  --ink:#1d1d1f;
  --gray:#86868b;
  --line:#d2d2d7;
  --line-soft:#ececee;
  --bg:#f5f5f7;
  --radius:14px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,'PingFang SC','Segoe UI','Microsoft YaHei',Roboto,sans-serif;color:var(--ink);background:#fff;line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{text-decoration:none;color:inherit;-webkit-tap-highlight-color:transparent}
img{display:block;max-width:100%}
.wrap{max-width:1160px;margin:0 auto;padding:0 28px;position:relative}

nav{position:fixed;top:0;left:0;right:0;z-index:100;transition:background .4s ease,box-shadow .4s ease}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:70px;transition:height .4s ease}
.brand{display:flex;align-items:center;gap:12px}
.logo-chip{background:#fff;border-radius:10px;padding:4px;display:flex;align-items:center;justify-content:center;box-shadow:0 2px 10px rgba(0,0,0,.12)}
.logo-chip img{height:32px;width:auto;border-radius:6px}
.brand b{font-size:15px;font-weight:600;letter-spacing:.5px;color:#fff;transition:color .4s ease}
.nav-links{display:flex;gap:34px;list-style:none}
.nav-links a{font-size:13.5px;color:rgba(255,255,255,.85);transition:color .2s}
.nav-links a:hover{color:#fff}
.nav-right{display:flex;align-items:center;gap:14px}
.btn{display:inline-flex;align-items:center;justify-content:center;font-size:14px;font-weight:500;border-radius:999px;padding:11px 24px;transition:all .25s ease;white-space:nowrap;cursor:pointer;border:none}
.btn-nav{background:#fff;color:var(--ink)}
.btn-nav:hover{transform:translateY(-1px);box-shadow:0 8px 20px rgba(0,0,0,.25)}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{background:#000;transform:translateY(-1px)}
.btn-lg{padding:15px 34px;font-size:15px}

nav.scrolled{background:rgba(255,255,255,.88);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);box-shadow:0 1px 0 var(--line-soft)}
nav.scrolled .nav-in{height:60px}
nav.scrolled .brand b{color:var(--ink)}
nav.scrolled .nav-links a{color:var(--gray)}
nav.scrolled .nav-links a:hover{color:var(--ink)}
nav.scrolled .btn-nav{background:var(--ink);color:#fff}

.hero{position:relative;height:100vh;height:100svh;min-height:600px;overflow:hidden;display:flex;align-items:center}
.hero-bg{position:absolute;inset:0;background:#0b1226}
.hero-video{position:absolute;inset:0;opacity:0;transition:opacity 1.2s ease}
.hero-video.ready{opacity:1}
.hero-video video{width:100%;height:100%;object-fit:cover;pointer-events:none;will-change:transform}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(8,14,38,.55) 0%,rgba(8,14,38,.35) 45%,rgba(8,14,38,.72) 100%);pointer-events:none}
.hero-content{position:relative;z-index:2;color:#fff;padding-top:70px;will-change:transform,opacity}
.hero-content .kicker{font-size:13px;color:rgba(255,255,255,.75);letter-spacing:3px;margin-bottom:22px}
.hero-content h1{font-size:56px;font-weight:600;line-height:1.22;letter-spacing:-.5px;margin-bottom:24px;max-width:820px;text-shadow:0 2px 30px rgba(0,0,0,.25)}
.hero-content h1 .thin{font-weight:400;color:rgba(255,255,255,.85)}
.hero-content p{font-size:17px;color:rgba(255,255,255,.82);max-width:600px;margin-bottom:40px;line-height:1.9}
.hero-actions{display:flex;align-items:center;gap:20px;flex-wrap:wrap}
.btn-white{background:#fff;color:var(--ink)}
.btn-white:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(0,0,0,.3)}
.btn-ghostw{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.6)}
.btn-ghostw:hover{background:rgba(255,255,255,.12);border-color:#fff}
.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid rgba(255,255,255,.25);margin-top:64px;max-width:760px}
.hero-stats div{padding:24px 24px 4px 0}
.hero-stats .n{font-size:30px;font-weight:600;letter-spacing:-.5px}
.hero-stats .l{font-size:13px;color:rgba(255,255,255,.7);margin-top:6px}

.scroll-hint{position:absolute;left:50%;bottom:30px;transform:translateX(-50%);z-index:3;display:flex;flex-direction:column;align-items:center;gap:8px;color:rgba(255,255,255,.8);font-size:12px;letter-spacing:3px;cursor:pointer}
.scroll-hint svg{width:22px;height:22px;stroke:rgba(255,255,255,.9);fill:none;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;animation:hint 1.8s ease-in-out infinite}
@keyframes hint{0%,100%{transform:translateY(0);opacity:.9}50%{transform:translateY(8px);opacity:.4}}

.reveal{opacity:0;transform:translateY(36px);transition:opacity .9s cubic-bezier(.22,.61,.36,1),transform .9s cubic-bezier(.22,.61,.36,1)}
.reveal.in{opacity:1;transform:none}

.sec-head{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:48px}
.sec-head h2{font-size:32px;font-weight:600;letter-spacing:-.5px}
.sec-head .sub{font-size:14px;color:var(--gray);margin-top:8px}
.sec-head .more{font-size:14px;color:var(--gray);border-bottom:1px solid var(--line);padding-bottom:2px;transition:all .2s;white-space:nowrap}
.sec-head .more:hover{color:var(--ink);border-color:var(--ink)}

.cats{padding:88px 0}
.cat-grid{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line)}
.cat{padding:30px 26px 30px 0;border-bottom:1px solid var(--line);border-right:1px solid var(--line-soft);display:block;transition:opacity .2s}
.cat:nth-child(4n){border-right:none;padding-right:0}
.cat:hover{opacity:.6}
.cat h3{font-size:17px;font-weight:600;margin-bottom:8px}
.cat p{font-size:13px;color:var(--gray);line-height:1.7}

.dark-sec{background:#0d1117;color:#fff}
.dark-sec .kicker-light{font-size:12px;color:rgba(255,255,255,.5);letter-spacing:3px;margin-bottom:20px}
.dark-sec .split-text h2{color:#fff}
.dark-sec .split-text p{color:rgba(255,255,255,.68)}

.feature{padding:104px 0}
.split{display:grid;grid-template-columns:1fr 1fr;gap:72px;align-items:center}
.split.media-left .split-media{order:-1}
.split-media{border-radius:18px;overflow:hidden}
.split-media img{width:100%;aspect-ratio:4/3;object-fit:cover;transition:transform .6s cubic-bezier(.2,.6,.2,1)}
.split-media:hover img{transform:scale(1.03)}
.split-text .kicker-dark{font-size:12px;color:var(--gray);letter-spacing:3px;margin-bottom:18px}
.split-text h2{font-size:32px;font-weight:600;letter-spacing:-.5px;line-height:1.4;margin-bottom:24px}
.split-text h3{font-size:24px;font-weight:600;letter-spacing:-.3px;line-height:1.5;margin-bottom:18px}
.split-text p{font-size:15px;color:var(--gray);line-height:2;margin-bottom:14px}
.split-text .btn{margin-top:12px}
.q-badge{display:inline-block;font-size:13px;font-weight:500;color:var(--ink);background:var(--bg);border:1px solid var(--line-soft);border-radius:999px;padding:7px 18px;margin-bottom:18px;letter-spacing:1px}
.dark-sec .split-media{box-shadow:0 30px 80px -30px rgba(0,0,0,.8);border:1px solid rgba(255,255,255,.08)}

.guarantee{background:var(--bg);padding:104px 0}
.guarantee .sec-head{flex-direction:column;align-items:flex-start;margin-bottom:44px}
.guarantee .sec-head h2{font-size:32px;font-weight:600;letter-spacing:-.5px}
.guarantee .sec-head .slogan{font-size:19px;font-weight:600;color:var(--ink);margin-top:16px;letter-spacing:1px}
.guarantee .sec-head .sub{margin-top:10px}
.g-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.g-card{background:#fff;border:1px solid var(--line-soft);border-radius:var(--radius);padding:32px 28px;transition:box-shadow .3s,transform .3s;position:relative;overflow:hidden}
.g-card:hover{box-shadow:0 18px 44px -24px rgba(0,0,0,.22);transform:translateY(-3px)}
.g-card .g-num{font-size:13px;font-weight:600;color:var(--gray);letter-spacing:2px;margin-bottom:22px}
.g-card .g-num::after{content:"";display:block;width:26px;height:2px;background:var(--ink);margin-top:12px}
.g-card h4{font-size:18px;font-weight:600;margin-bottom:14px;letter-spacing:-.2px}
.g-card p{font-size:14px;color:var(--gray);line-height:1.9}
.g-card p + p{margin-top:6px}
.g-tip{margin-top:36px;font-size:13.5px;color:var(--gray);line-height:1.9;border-left:2px solid var(--line);padding-left:16px}

.showcase-media{background:#fff}
.showcase-media img{aspect-ratio:auto;max-height:760px;width:100%;object-fit:contain}

.quality{border-top:1px solid var(--line-soft)}
.quality .q-row{margin-top:64px}
.quality .q-row:first-of-type{margin-top:0}

.videos{padding:104px 0}
.videos .sec-head h2{color:#fff}
.videos .sec-head .sub{color:rgba(255,255,255,.5)}
.v-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.v-card{border-radius:var(--radius);overflow:hidden;background:#000;border:1px solid rgba(255,255,255,.08)}
.v-card video{width:100%;aspect-ratio:4/3;object-fit:cover;display:block;background:#000}

.about{padding:96px 0}
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:72px;align-items:start}
.about .kicker-dark{font-size:12px;color:var(--gray);letter-spacing:3px;margin-bottom:18px}
.about h2{font-size:34px;font-weight:600;letter-spacing:-.5px;line-height:1.35;margin-bottom:22px}
.about p{font-size:15px;color:var(--gray);line-height:2;margin-bottom:16px}
.about .btn{margin-top:14px}
.app-tags{display:flex;flex-wrap:wrap;gap:8px;margin:20px 0 8px}
.app-tags span{font-size:12.5px;color:var(--ink);background:var(--bg);border:1px solid var(--line-soft);border-radius:999px;padding:6px 14px}
.about-list{list-style:none;border-top:1px solid var(--line);align-self:start}
.about-list li{padding:17px 0;border-bottom:1px solid var(--line-soft);font-size:15px;color:var(--ink);display:flex;justify-content:space-between;gap:16px}
.about-list li span{color:var(--gray);font-size:13.5px;text-align:right;flex-shrink:0}

.promise{padding:24px 0 96px}
.promise-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.promise-item{border:1px solid var(--line-soft);border-radius:var(--radius);padding:34px 30px;background:#fff;transition:box-shadow .3s,transform .3s}
.promise-item:hover{box-shadow:0 16px 40px -24px rgba(0,0,0,.25);transform:translateY(-3px)}
.promise-tag{display:inline-block;font-size:12px;letter-spacing:2px;color:var(--ink);border:1px solid var(--line);border-radius:999px;padding:5px 14px;margin-bottom:18px}
.promise-item.en .promise-tag{display:block}
.promise-en{font-size:11px;color:var(--gray);letter-spacing:1.5px;margin:-10px 0 16px}
.promise-item h4{font-size:18px;font-weight:600;margin-bottom:12px;letter-spacing:-.2px}
.promise-item p{font-size:14px;color:var(--gray);line-height:1.95}

.svc{border-top:1px solid var(--line-soft);padding:72px 0}
.svc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:1px solid var(--line)}
.svc-item{padding:28px 24px 28px 0;border-right:1px solid var(--line-soft)}
.svc-item:last-child{border-right:none}
.svc-item h4{font-size:15px;font-weight:600;margin-bottom:6px}
.svc-item p{font-size:13px;color:var(--gray)}

.cta-band{background:var(--bg);padding:96px 0;text-align:center}
.cta-band h2{font-size:38px;font-weight:600;letter-spacing:-.5px;margin-bottom:16px}
.cta-band p{font-size:16px;color:var(--gray);margin-bottom:36px}

footer{border-top:1px solid var(--line-soft);padding:56px 0 32px}
.foot-grid{display:grid;grid-template-columns:1.8fr 1fr 1fr 1fr;gap:40px;padding-bottom:40px;border-bottom:1px solid var(--line-soft)}
.foot-brand .logo-chip{display:inline-flex;margin-bottom:14px}
.foot-brand p{font-size:13px;color:var(--gray);line-height:1.9;max-width:320px}
.foot-col h5{font-size:13px;font-weight:600;margin-bottom:14px;color:var(--ink)}
.foot-col a{display:block;font-size:13px;color:var(--gray);padding:5px 0;transition:color .2s}
.foot-col a:hover{color:var(--ink)}
.foot-bottom{padding-top:24px;display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;font-size:12px;color:var(--gray)}

@media (max-width:900px){
  .wrap{padding:0 20px}
  .nav-links{display:none}
  .hero-content h1{font-size:34px}
  .hero-content p{font-size:15px}
  .hero-stats{grid-template-columns:1fr 1fr;margin-top:44px;gap:0}
  .hero-stats div{padding:18px 12px 4px 0}
  .cats,.about{padding:60px 0}
  .feature,.guarantee,.videos{padding:64px 0}
  .cat-grid{grid-template-columns:1fr 1fr}
  .cat{padding-right:18px}
  .cat:nth-child(4n){border-right:1px solid var(--line-soft)}
  .cat:nth-child(2n){border-right:none;padding-right:0}
  .split{grid-template-columns:1fr;gap:36px}
  .split.media-left .split-media{order:0}
  .split-text h2{font-size:26px}
  .split-text h3{font-size:20px}
  .g-grid{grid-template-columns:1fr 1fr;gap:14px}
  .g-card{padding:26px 22px}
  .showcase-media img{max-height:560px}
  .quality .q-row{margin-top:48px}
  .v-grid{grid-template-columns:1fr;gap:18px}
  .about-grid{grid-template-columns:1fr;gap:40px}
  .promise{padding:0 0 60px}
  .promise-grid{grid-template-columns:1fr;gap:16px}
  .promise-item{padding:28px 24px}
  .about h2,.cta-band h2{font-size:27px}
  .sec-head h2{font-size:26px}
  .svc-grid{grid-template-columns:1fr 1fr}
  .svc-item{border-bottom:1px solid var(--line-soft)}
  .foot-grid{grid-template-columns:1fr 1fr;gap:28px}
  .cta-band{padding:64px 0}
  .scroll-hint{display:none}
}
@media (max-width:480px){
  .brand b{font-size:13px}
  .btn{padding:10px 18px;font-size:13px}
}