:root{
  --brand-orange:#ff6432;
  --brand-purple:#6432c8;
  --brand-gray:#464646;
  --text:#3a3a3a;
  --muted:#7a7a7a;
  --bg:#ffffff;
  --bg-alt:#f7f5fb;
  --line:#e8e4f0;
  --serif:"Noto Serif SC","Songti SC","STSong",serif;
  --sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--text);background:var(--bg);line-height:1.8;font-size:16px}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{max-width:1140px;margin:0 auto;padding:0 24px}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.95);border-bottom:1px solid var(--line);backdrop-filter:blur(6px)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand-logo{height:44px;width:auto}
.nav{display:flex;align-items:center;gap:28px;font-size:15px}
.nav a{color:var(--brand-gray);transition:color .2s}
.nav a:hover{color:var(--brand-orange)}
.nav .nav-cta{background:var(--brand-orange);color:#fff;padding:8px 20px;border-radius:4px}
.nav .nav-cta:hover{background:#e8551f;color:#fff}
.nav-toggle{display:none;background:none;border:none;font-size:22px;color:var(--brand-gray);cursor:pointer}

/* Banner */
.banner{background:
  radial-gradient(1200px 500px at 85% -10%,rgba(255,100,50,.35),transparent 60%),
  radial-gradient(900px 480px at 10% 110%,rgba(255,255,255,.12),transparent 55%),
  linear-gradient(135deg,#4b2596 0%,var(--brand-purple) 55%,#7c4dd8 100%);
  color:#fff;padding:110px 0 120px;text-align:center}
.banner h1{font-family:var(--serif);font-size:clamp(26px,4vw,42px);letter-spacing:.04em;font-weight:700;text-wrap:balance;max-width:760px;margin:0 auto}
.banner-sub{margin-top:10px;font-size:15px;letter-spacing:.18em;opacity:.75;text-transform:uppercase}
.banner-slogan{margin:26px auto 40px;font-family:var(--serif);font-size:clamp(18px,2.6vw,24px);letter-spacing:.35em;color:#ffd9c9}
.banner-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-block;padding:13px 34px;border-radius:4px;font-size:15px;letter-spacing:.1em;transition:all .2s}
.btn-primary{background:var(--brand-orange);color:#fff}
.btn-primary:hover{background:#ff7a4d;transform:translateY(-2px)}
.btn-ghost{border:1px solid rgba(255,255,255,.6);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.12)}

/* Sections */
.section{padding:88px 0}
.section-alt{background:var(--bg-alt)}
.section-head{text-align:center;margin-bottom:52px}
.section-head.left{text-align:left;margin-bottom:24px}
.section-head h2{font-family:var(--serif);font-size:32px;color:var(--brand-gray);letter-spacing:.08em;position:relative;display:inline-block;padding-bottom:14px}
.section-head h2::after{content:"";position:absolute;left:50%;transform:translateX(-50%);bottom:0;width:56px;height:3px;background:var(--brand-orange);border-radius:2px}
.section-head.left h2::after{left:0;transform:none}
.section-head p{color:var(--muted);margin-top:14px;font-size:15px}
.lead{max-width:820px;margin:0 auto;text-align:center;font-size:19px;color:var(--brand-gray);font-family:var(--serif);line-height:2}

/* Video section */
.section-video{background:linear-gradient(180deg,#241b38 0%,#2c2340 100%);color:#fff}
.section-video .section-head h2{color:#fff}
.section-video .section-head p{color:#b9aede}
.video-frame{max-width:960px;margin:0 auto}
.video-frame video{width:100%;aspect-ratio:16/9;border-radius:10px;background:#000;box-shadow:0 24px 60px rgba(0,0,0,.5);display:block}
.video-frame figcaption{text-align:center;margin-top:18px;font-size:13.5px;letter-spacing:.15em;color:#9d8fc4}

/* Service cards */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.card{background:#fff;border:1px solid var(--line);border-radius:8px;padding:36px 28px;transition:all .25s;box-shadow:0 1px 3px rgba(70,50,120,.05)}
.card:hover{transform:translateY(-6px);box-shadow:0 14px 30px rgba(100,50,200,.12);border-color:#d8ccef}
.card h3{font-family:var(--serif);font-size:19px;color:var(--brand-gray);margin-bottom:12px}
.card p{font-size:14.5px;color:var(--muted)}
.card-count{margin-top:20px;display:flex;align-items:baseline;gap:6px}
.card-count b{font-family:var(--serif);font-size:34px;font-weight:700;color:var(--brand-purple);line-height:1;display:inline-block;transition:transform .35s cubic-bezier(.22,.68,.35,1.4),color .35s ease;cursor:default}
.card-count:hover b{transform:scale(1.35) translateY(-3px);color:var(--brand-orange)}
.card-count:hover span{transition:transform .35s ease;transform:translateX(3px)}
.card-count span{font-size:14px;color:var(--brand-orange);letter-spacing:.05em}

/* About */
.about-grid{display:grid;grid-template-columns:1.6fr 1fr;gap:56px;align-items:start}
.about-text p{margin-bottom:16px;color:var(--text)}
.about-text .note{color:var(--brand-orange);font-size:14px}
.about-highlights{background:linear-gradient(160deg,var(--brand-purple),#4b2596);color:#fff;border-radius:8px;padding:34px 30px}
.about-highlights h3{font-family:var(--serif);font-size:20px;margin-bottom:18px;letter-spacing:.06em}
.about-highlights ul{list-style:none}
.about-highlights li{padding:10px 0 10px 26px;position:relative;font-size:14.5px;border-bottom:1px solid rgba(255,255,255,.15)}
.about-highlights li:last-child{border-bottom:none}
.about-highlights li::before{content:"◆";position:absolute;left:2px;color:var(--brand-orange);font-size:12px;top:12px}

/* AI 审核平台入口 */
.nav .nav-ai{color:var(--brand-purple);font-weight:600;position:relative}
.nav .nav-ai em{font-style:normal;font-size:10px;background:var(--brand-orange);color:#fff;border-radius:7px;padding:1px 6px;margin-left:5px;vertical-align:super;letter-spacing:.05em}
.nav .nav-ai:hover{color:var(--brand-orange)}
.section-ai{background:linear-gradient(180deg,#faf8ff 0%,#f4efff 100%)}
.ai-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.ai-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:34px 28px;transition:all .25s;box-shadow:0 1px 3px rgba(70,50,120,.05)}
.ai-card:hover{transform:translateY(-6px);box-shadow:0 16px 36px rgba(100,50,200,.14)}
.ai-tag{display:inline-block;font-size:12px;color:var(--brand-purple);border:1px solid var(--brand-purple);border-radius:3px;padding:1px 8px;letter-spacing:.12em;margin-bottom:14px}
.ai-card h3{font-family:var(--serif);font-size:20px;color:var(--brand-gray);margin-bottom:12px}
.ai-card p{font-size:14.5px;color:var(--muted)}
.ai-price{margin-top:18px;font-family:var(--serif);font-size:24px;font-weight:700;color:var(--brand-orange)}
.ai-price s{font-size:15px;color:#b3a8c8;font-weight:400;margin-left:6px}
.ai-price .ai-price-note{display:block;font-family:var(--sans);font-size:12px;font-weight:400;color:var(--muted);letter-spacing:.04em}
.ai-card-cta{display:flex;flex-direction:column;background:linear-gradient(160deg,var(--brand-purple),#4b2596);border:none}
.ai-card-cta h3{color:#fff}
.ai-card-cta p{color:#e4dcf7;flex:1}
.ai-card-cta p b{color:#ffd9c9;font-size:17px}
.ai-card-cta .btn{text-align:center}
.ai-note{margin-top:30px;text-align:center;font-size:13.5px;color:var(--muted)}
.ai-note b{color:var(--brand-purple)}

/* Partners */
.partner-cols{display:grid;grid-template-columns:1fr 1fr;gap:30px;max-width:1080px;margin:0 auto}
.partner-panel{background:#fff;border:1px solid var(--line);border-radius:16px;padding:40px 46px 34px;min-height:262px;display:flex;flex-direction:column;transition:all .25s}
.partner-panel:hover{transform:translateY(-4px);box-shadow:0 18px 40px rgba(100,50,200,.12)}
.partner-panel h3{margin:0;font-family:var(--serif);font-size:22px;font-weight:700;letter-spacing:3px;color:var(--brand-gray);text-align:center}
.partner-panel h3::after{content:"";display:block;width:36px;height:3px;border-radius:2px;background:var(--brand-orange);margin:14px auto 0}
.partner-showcase{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:30px;padding:24px 0 10px}
.partner-logo{height:70px;width:auto;max-width:96%;object-fit:contain}
.partner-logo.sm{height:58px}
.client-grid{flex:1;display:grid;grid-template-columns:repeat(2,1fr);gap:14px 20px;padding:24px 0 6px;align-items:center}
.client-grid img{width:100%;height:140px;object-fit:contain;padding:4px 8px}
.client-grid img:last-child:nth-child(odd){grid-column:1/-1;justify-self:center;max-width:calc(50% - 10px)}
.partner-logo,.client-grid img{transition:transform .4s cubic-bezier(.22,.68,.35,1.4),box-shadow .4s ease;cursor:pointer}
.partner-logo:hover,.client-grid img:hover{transform:scale(1.1) translateY(-4px)}
.client-grid img:hover{box-shadow:0 12px 28px rgba(100,50,200,.18);border-radius:10px}

/* Why */
.why-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.why-item{border-top:3px solid var(--brand-orange);padding-top:20px}
.why-item strong{display:block;font-family:var(--serif);font-size:17px;color:var(--brand-gray);margin-bottom:10px}
.why-item span{font-size:14px;color:var(--muted)}

/* Contact */
.section-contact{background:var(--bg-alt)}
.contact-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.contact-item{background:#fff;border:1px solid var(--line);border-radius:8px;padding:28px 16px}
.contact-item strong{display:block;font-size:15px;color:var(--brand-purple);margin-bottom:10px;letter-spacing:.08em}
.contact-item span{font-size:14px;color:var(--muted)}
.contact-qr{display:flex;flex-direction:column;align-items:center;gap:12px}
.contact-qr img{width:120px;height:120px;border-radius:6px}
.qr-caption{font-size:13px;color:var(--muted);line-height:1.7}

/* Footer */
.site-footer{background:#2c2340;color:#cfc6e6;padding:56px 0 40px;text-align:center}
.footer-logo{height:56px;margin:0 auto 14px}
.footer-name{font-family:var(--serif);letter-spacing:.14em;font-size:17px;color:#fff;margin-bottom:8px}
.footer-slogan{font-family:var(--serif);letter-spacing:.3em;color:#ffd9c9;margin-bottom:16px}
.footer-copy{font-size:13px;opacity:.7}
.footer-icp{font-size:12px;opacity:.5;margin-top:6px}
.footer-icp a{color:inherit;text-decoration:none}
.footer-icp a:hover{text-decoration:underline}

/* Responsive */
@media (max-width:900px){
  .cards{grid-template-columns:repeat(2,1fr)}
  .why-grid,.contact-grid{grid-template-columns:repeat(2,1fr)}
  .about-grid{grid-template-columns:1fr}
}
@media (max-width:640px){
  .nav{display:none;position:absolute;top:72px;left:0;right:0;background:#fff;flex-direction:column;padding:20px;border-bottom:1px solid var(--line);gap:16px}
  .nav.open{display:flex}
  .nav-toggle{display:block}
  .cards{grid-template-columns:1fr}
  .banner{padding:70px 0 80px}
  .section{padding:60px 0}
  .partner-cols{grid-template-columns:1fr;gap:22px}
}