:root{
  --ink:#0c1b3a;
  --ink-2:#33456b;
  --muted:#5f7195;
  --blue:#1a52d8;
  --blue-deep:#0e2f86;
  --blue-soft:#eaf1ff;
  --line:#dbe5fb;
  --accent:#ffc53d;
  --radius-lg:22px;
  --radius:14px;
  --shadow-sm:0 4px 14px rgba(16,42,99,.07);
  --shadow:0 16px 36px rgba(16,42,99,.12);
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--ink);
  font-size:16px;
  line-height:1.7;
  background-color:#f2f6ff;
  background-image:
    radial-gradient(900px 520px at 6% -8%, #dbe7ff 0%, rgba(219,231,255,0) 62%),
    radial-gradient(760px 460px at 98% 2%, #e3efff 0%, rgba(227,239,255,0) 60%),
    linear-gradient(180deg,#f8fbff 0%,#eef3ff 45%,#f5f9ff 100%);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;}
a{color:inherit;}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px;}
h1,h2,h3{margin:0;color:#08183a;font-weight:800;letter-spacing:-.2px;}
p{margin:0;}
ul{margin:0;padding:0;list-style:none;}
section[id]{scroll-margin-top:92px;}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:120;
  background:rgba(255,255,255,.94);
  backdrop-filter:blur(10px);
  border-bottom:1px solid rgba(219,229,251,.9);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:18px;position:relative;min-height:72px;}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;flex:0 0 auto;}
.ai-page-logo{display:block;max-height:44px;max-width:160px;width:auto;}
.brand-text{display:flex;flex-direction:column;line-height:1.18;}
.brand-text strong{font-size:17px;color:#08183a;}
.brand-text small{font-size:11px;color:var(--muted);letter-spacing:.4px;}
.nav-links{display:flex;align-items:center;gap:0;}
.nav-links a{
  padding:9px 7px;font-size:14px;color:#22345a;text-decoration:none;
  border-radius:8px;white-space:nowrap;transition:color .2s,background .2s;
}
.nav-links a:hover{color:var(--blue);background:#eef4ff;}
.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto;}
.nav-toggle{
  display:none;flex-direction:column;justify-content:center;gap:5px;
  width:44px;height:40px;padding:0 11px;cursor:pointer;
  border:1px solid var(--line);border-radius:10px;background:#fff;
}
.nav-toggle span{display:block;height:2px;border-radius:2px;background:#1a52d8;transition:transform .25s,opacity .25s;}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:13px 26px;border-radius:999px;font-size:15px;font-weight:700;
  text-decoration:none;border:1px solid transparent;cursor:pointer;font-family:inherit;
  transition:transform .25s ease,box-shadow .25s ease,background .25s ease,color .25s ease;
}
.btn-primary{background:linear-gradient(135deg,#1a52d8,#3f7bf7);color:#fff;box-shadow:0 12px 26px rgba(26,82,216,.3);}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 32px rgba(26,82,216,.4);}
.btn-ghost{background:#fff;color:#123a9e;border-color:#c7d7fb;box-shadow:var(--shadow-sm);}
.btn-ghost:hover{background:#eef4ff;transform:translateY(-2px);}
.btn-sm{padding:9px 18px;font-size:13.5px;}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;padding:62px 0 46px;}
.hero::before{
  content:"";position:absolute;top:-150px;right:-90px;width:420px;height:420px;border-radius:50%;
  background:radial-gradient(circle,rgba(63,123,247,.28),rgba(63,123,247,0) 68%);
  animation:floatA 13s ease-in-out infinite;
}
.hero::after{
  content:"";position:absolute;bottom:-140px;left:-70px;width:340px;height:340px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,197,61,.3),rgba(255,197,61,0) 70%);
  animation:floatB 16s ease-in-out infinite;
}
@keyframes floatA{0%,100%{transform:translate3d(0,0,0);}50%{transform:translate3d(-26px,26px,0);}}
@keyframes floatB{0%,100%{transform:translate3d(0,0,0);}50%{transform:translate3d(22px,-20px,0);}}
.hero-inner{position:relative;z-index:2;max-width:880px;}
.hero-eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 16px;border-radius:999px;background:#e4edff;border:1px solid #c9dbff;
  color:#1440a8;font-size:13px;font-weight:700;letter-spacing:.6px;
}
.hero h1{font-size:clamp(30px,4.3vw,50px);line-height:1.2;margin:20px 0 16px;}
.hero-desc{font-size:clamp(15px,1.5vw,17px);color:#42557a;max-width:780px;margin-bottom:28px;}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;}
.hero-points{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px;}
.hero-points li{
  padding:8px 16px;background:rgba(255,255,255,.9);border:1px solid var(--line);
  border-radius:10px;font-size:13.5px;color:#2b4170;box-shadow:var(--shadow-sm);
}

/* ---------- stats ---------- */
.stats-band{padding:6px 0 14px;}
.stats-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:16px;
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:26px 22px;box-shadow:var(--shadow);
}
.stat{text-align:center;}
.stat strong{display:block;font-size:clamp(22px,2.6vw,30px);color:#12409f;font-weight:800;letter-spacing:-.5px;}
.stat span{font-size:13px;color:var(--muted);}

/* ---------- sections ---------- */
.section{padding:56px 0;}
.section-head{max-width:780px;margin-bottom:32px;}
.section-kicker{
  display:inline-block;font-size:12.5px;font-weight:800;color:#1a52d8;
  letter-spacing:2.4px;text-transform:uppercase;margin:0 0 10px;
  padding-left:12px;border-left:3px solid #1a52d8;
}
.section-title{font-size:clamp(23px,2.9vw,34px);line-height:1.3;margin-bottom:12px;}
.section-desc{color:#4a5c80;font-size:15.5px;}

.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;box-shadow:var(--shadow-sm);
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#b9cffb;}
.card h3{font-size:16.5px;margin-bottom:8px;}
.card p{font-size:14px;color:#4d5f83;}

.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;}

/* about */
.about-lead{font-size:15.5px;color:#3d5075;max-width:920px;margin-bottom:28px;}
.about-lead strong{color:#123a9e;}

/* studio */
.studio-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.studio-item{
  background:#fff;border:1px solid var(--line);border-left:4px solid #3f7bf7;
  border-radius:12px;padding:18px 20px;box-shadow:var(--shadow-sm);
  transition:transform .25s ease,box-shadow .25s ease;
}
.studio-item:hover{transform:translateY(-3px);box-shadow:var(--shadow);}
.studio-item h3{font-size:15.5px;margin-bottom:6px;}
.studio-item p{font-size:13.5px;color:#4d5f83;}
.tag-cloud{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px;}
.tag-cloud li{
  padding:7px 15px;border-radius:999px;background:#fff;border:1px solid #cdddfb;
  font-size:13px;color:#25417a;transition:background .2s,color .2s,transform .2s;
}
.tag-cloud li:hover{background:#1a52d8;color:#fff;transform:translateY(-2px);}

/* network */
.network-panel{
  background:linear-gradient(135deg,#e8f0ff,#f7faff 60%,#e9f1ff);
  border:1px solid #cdddfb;border-radius:var(--radius-lg);
  padding:34px;display:grid;grid-template-columns:1.25fr .75fr;gap:28px;align-items:center;
}
.network-panel h2{font-size:clamp(22px,2.6vw,30px);margin-bottom:12px;}
.network-panel p{color:#42557a;font-size:15px;}
.network-list{display:flex;flex-direction:column;gap:12px;}
.network-list li{
  background:rgba(255,255,255,.92);border:1px solid #d6e3fd;border-radius:12px;
  padding:12px 16px;font-size:14px;color:#1d356b;font-weight:600;
}

/* process */
.step-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow-sm);}
.step-num{
  display:inline-flex;align-items:center;justify-content:center;
  width:38px;height:38px;border-radius:12px;margin-bottom:12px;
  background:linear-gradient(135deg,#1a52d8,#3f7bf7);color:#fff;font-weight:800;font-size:14px;
}
.step h3{font-size:16px;margin-bottom:6px;}
.step p{font-size:14px;color:#4d5f83;}

/* cases */
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.case-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:14px;box-shadow:var(--shadow-sm);margin:0;
  transition:transform .25s ease,box-shadow .25s ease;
}
.case-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);}
.case-media{
  aspect-ratio:4/3;background:#eef3ff;border-radius:10px;overflow:hidden;
  display:flex;align-items:center;justify-content:center;padding:10px;
}
.case-media img{width:100%;height:100%;object-fit:contain;display:block;}
.case-card figcaption{padding:14px 6px 6px;}
.case-card h3{font-size:15.5px;margin-bottom:6px;}
.case-card p{font-size:13.5px;color:#4d5f83;}

/* review score */
.score-card{
  display:grid;grid-template-columns:220px 1fr;gap:26px;align-items:center;
  background:linear-gradient(135deg,#0e2f86,#1a52d8 65%,#3f7bf7);
  border-radius:var(--radius-lg);padding:32px;color:#fff;margin-bottom:26px;
  box-shadow:0 18px 40px rgba(14,47,134,.28);
}
.score-left{text-align:center;border-right:1px solid rgba(255,255,255,.25);padding-right:20px;}
.score-value{display:block;font-size:52px;font-weight:800;line-height:1;color:#ffffff;}
.score-max{display:block;font-size:14px;color:#d9e5ff;margin-top:6px;}
.score-label{font-size:13.5px;color:#d9e5ff;margin-top:8px;}
.score-right h3{color:#fff;font-size:20px;margin-bottom:10px;}
.stars{font-size:22px;letter-spacing:4px;color:#ffc53d;line-height:1;}
.score-right p{color:#dce7ff;font-size:14.5px;margin-top:10px;}

/* table */
.table-scroll{
  overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);
  background:#fff;box-shadow:var(--shadow-sm);
}
table{width:100%;border-collapse:collapse;min-width:720px;font-size:14.5px;}
thead th{background:#eaf1ff;color:#10337f;font-weight:700;text-align:left;padding:15px 18px;border-bottom:1px solid #d6e3fd;}
tbody td{padding:14px 18px;border-bottom:1px solid #edf2ff;color:#33456b;vertical-align:top;}
tbody tr:last-child td{border-bottom:none;}
tbody tr:hover{background:#f7faff;}
tbody td:first-child{font-weight:700;color:#12285a;}
.hl{color:#12409f;font-weight:700;}
.table-note{font-size:13px;color:var(--muted);margin-top:12px;}

/* reviews */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.review-card{
  margin:0;background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;gap:14px;
  transition:transform .25s ease,box-shadow .25s ease;
}
.review-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);}
.review-card blockquote{
  margin:0;font-size:14.5px;color:#3a4c72;line-height:1.75;
  border-left:3px solid #cdddfb;padding-left:14px;
}
.review-meta strong{display:block;font-size:14.5px;color:#10265a;}
.review-meta span{font-size:12.5px;color:var(--muted);}

/* form */
.form-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:30px;box-shadow:var(--shadow);
}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;}
.form-field{display:flex;flex-direction:column;gap:8px;}
.form-field.full{grid-column:1 / -1;}
.form-field label{font-size:14px;font-weight:700;color:#25395f;}
.form-field input,.form-field select,.form-field textarea{
  width:100%;padding:12px 14px;border:1px solid #cddafa;border-radius:10px;
  font-size:15px;font-family:inherit;color:#0c1b3a;background:#fbfdff;
  transition:border-color .2s,box-shadow .2s;
}
.form-field textarea{min-height:120px;resize:vertical;}
.form-field input:focus,.form-field select:focus,.form-field textarea:focus{
  outline:none;border-color:#2b6bf3;box-shadow:0 0 0 3px rgba(43,107,243,.15);
}
.form-actions{grid-column:1 / -1;display:flex;flex-wrap:wrap;align-items:center;gap:14px;}
.form-tip{font-size:13px;color:var(--muted);}

/* help */
.help-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.help-item{
  background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px;
  box-shadow:var(--shadow-sm);transition:transform .25s ease,box-shadow .25s ease;
}
.help-item:hover{transform:translateY(-3px);box-shadow:var(--shadow);}
.help-item h3{font-size:15px;margin-bottom:6px;}
.help-item p{font-size:13.5px;color:#4d5f83;}

/* faq */
.faq-list{max-width:960px;}
.faq-item{
  background:#fff;border:1px solid var(--line);border-radius:12px;
  margin-bottom:12px;overflow:hidden;box-shadow:var(--shadow-sm);
}
.faq-item summary{
  position:relative;list-style:none;cursor:pointer;padding:16px 50px 16px 18px;
  font-size:15.5px;font-weight:700;color:#0f2550;transition:background .2s;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{
  content:"+";position:absolute;right:20px;top:50%;transform:translateY(-50%);
  font-size:20px;color:#1a52d8;font-weight:700;line-height:1;
}
.faq-item[open] summary{background:#eef4ff;}
.faq-item[open] summary::after{content:"−";}
.faq-item p{padding:0 18px 18px;font-size:14.5px;color:#4a5c80;}

/* articles */
.article-columns{display:grid;grid-template-columns:1fr 1fr;gap:22px;}
.article-col{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:24px;box-shadow:var(--shadow-sm);}
.article-col h3{font-size:17px;margin-bottom:6px;}
.article-col > p{font-size:13.5px;color:var(--muted);margin-bottom:12px;}
.article-list li + li{border-top:1px dashed #e3ebfd;}
.article-list a{
  display:flex;gap:10px;padding:12px 0;font-size:14.5px;color:#22345a;
  text-decoration:none;transition:color .2s,padding-left .2s;
}
.article-list a::before{content:"›";color:#2b6bf3;font-weight:800;}
.article-list a:hover{color:#1a52d8;padding-left:6px;}

/* contact */
.contact-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:22px;align-items:start;}
.contact-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:28px;box-shadow:var(--shadow-sm);}
.contact-list li{display:flex;flex-wrap:wrap;gap:10px;padding:13px 0;border-bottom:1px dashed #e3ebfd;font-size:14.5px;color:#33456b;}
.contact-list li:last-child{border-bottom:none;}
.ci-label{
  min-width:92px;font-weight:700;color:#10265a;font-size:13.5px;
  flex:0 0 auto;
}
.contact-list a{color:#1a52d8;text-decoration:none;}
.contact-list a:hover{text-decoration:underline;}
.qr-card{text-align:center;}
.qr-card img{width:100%;max-width:210px;height:auto;display:block;margin:0 auto 14px;border-radius:12px;border:1px solid var(--line);}
.qr-card p{font-size:14px;color:#33456b;}

/* agent */
.agent-panel{
  background:linear-gradient(135deg,#e8f0ff,#f7faff 58%,#e9f1ff);
  border:1px solid #cdddfb;border-radius:var(--radius-lg);
  padding:34px;display:grid;grid-template-columns:1.4fr .6fr;gap:26px;align-items:center;
}
.agent-panel h2{font-size:clamp(22px,2.6vw,30px);margin-bottom:12px;}
.agent-panel p{color:#42557a;font-size:15px;}
.agent-actions{display:flex;flex-direction:column;gap:12px;}
.agent-actions .btn{width:100%;}

/* footer */
.site-footer{background:#0a1a3f;color:#d7e3ff;padding:44px 0 22px;margin-top:56px;}
.footer-top{display:grid;grid-template-columns:1.2fr .9fr 1.4fr;gap:32px;align-items:start;}
.site-footer .ai-page-logo{max-height:40px;filter:brightness(0) invert(1);opacity:.95;}
.footer-brand p{font-size:13.5px;color:#a9bde8;margin-top:12px;line-height:1.8;}
.footer-col h3,.footer-col-links h3{font-size:14.5px;color:#ffffff;margin-bottom:12px;font-weight:700;}
.footer-col li{font-size:13.5px;color:#a9bde8;padding:4px 0;}
.footer-col a{color:#d7e3ff;text-decoration:none;}
.footer-col a:hover{color:#ffffff;text-decoration:underline;}
.footer-links{display:flex;flex-wrap:wrap;gap:8px 14px;}
.footer-links a{
  font-size:13px;color:#c3d5f7;text-decoration:none;padding:4px 0;
  transition:color .2s;
}
.footer-links a:hover{color:#ffffff;text-decoration:underline;}
.footer-bottom{
  margin-top:28px;padding-top:16px;border-top:1px solid rgba(215,227,255,.18);
  font-size:12.5px;color:#8fa6d2;display:flex;flex-wrap:wrap;gap:10px;
  justify-content:space-between;align-items:center;
}
.footer-bottom a{color:#c3d5f7;text-decoration:none;}
.footer-bottom a:hover{color:#ffffff;}

/* float tools */
.float-tools{position:fixed;right:18px;bottom:22px;display:flex;flex-direction:column;gap:10px;z-index:130;}
.float-btn{
  width:48px;height:48px;border-radius:50%;border:1px solid #cdddfb;background:#fff;color:#1a52d8;
  display:flex;align-items:center;justify-content:center;font-size:12.5px;font-weight:800;
  cursor:pointer;box-shadow:0 10px 24px rgba(16,42,99,.16);text-decoration:none;
  transition:transform .2s,background .2s,color .2s,opacity .25s;
}
.float-btn:hover{transform:translateY(-3px);background:#1a52d8;color:#fff;}
#backTop{opacity:0;pointer-events:none;}
#backTop.show{opacity:1;pointer-events:auto;}

/* reveal */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .65s ease,transform .65s ease;}
.reveal.in{opacity:1;transform:none;}

/* ---------- responsive ---------- */
@media (max-width:1120px){
  .nav-toggle{display:flex;}
  .nav-links{
    position:absolute;top:100%;left:0;right:0;display:none;
    flex-direction:column;align-items:stretch;
    background:#fff;border-bottom:1px solid var(--line);
    padding:8px 20px 16px;box-shadow:0 18px 32px rgba(16,42,99,.12);
  }
  .nav-links.open{display:flex;}
  .nav-links a{padding:13px 4px;font-size:15px;border-bottom:1px solid #eef3ff;border-radius:0;}
  .nav-links a:last-child{border-bottom:none;}
}
@media (max-width:980px){
  .stats-grid{grid-template-columns:repeat(2,1fr);}
  .grid-3,.studio-grid,.step-grid,.review-grid,.case-grid{grid-template-columns:repeat(2,1fr);}
  .help-grid{grid-template-columns:repeat(2,1fr);}
  .network-panel,.agent-panel{grid-template-columns:1fr;padding:26px;}
  .score-card{grid-template-columns:1fr;padding:26px;}
  .score-left{border-right:none;border-bottom:1px solid rgba(255,255,255,.25);padding:0 0 18px;}
  .contact-grid{grid-template-columns:1fr;}
  .article-columns{grid-template-columns:1fr;}
  .footer-top{grid-template-columns:1fr 1fr;}
}
@media (max-width:720px){
  .hero{padding:46px 0 36px;}
  .section{padding:44px 0;}
  .grid-3,.grid-2,.studio-grid,.step-grid,.review-grid,.case-grid,.help-grid{grid-template-columns:1fr;}
  .form-grid{grid-template-columns:1fr;}
  .brand-text small{display:none;}
  .header-actions .btn-sm{display:none;}
  .footer-top{grid-template-columns:1fr;}
  .site-footer{margin-top:44px;}
}