:root{
  --blue:#2b5cff;
  --blue-deep:#1b3fb8;
  --teal:#00bfa6;
  --orange:#ff7a3d;
  --ink:#0f1c34;
  --ink-2:#3c4d6d;
  --ink-3:#586a8b;
  --line:#e1eaf9;
  --line-strong:#cfe0ff;
  --white:#ffffff;
  --card-shadow:0 8px 24px rgba(24,54,120,.06);
  --card-shadow-hover:0 18px 36px rgba(24,54,120,.12);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:88px}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:16px;
  line-height:1.72;
  color:var(--ink-2);
  background-color:#f3f8ff;
  background-image:
    radial-gradient(900px 520px at 92% -4%, rgba(43,92,255,.13), transparent 62%),
    radial-gradient(760px 520px at 2% 6%, rgba(0,191,166,.12), transparent 60%),
    radial-gradient(900px 620px at 62% 104%, rgba(255,122,61,.09), transparent 64%);
  background-repeat:no-repeat;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
h1,h2,h3,h4{margin:0;line-height:1.3;color:var(--ink);font-weight:800}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
a{color:var(--blue);text-decoration:none}
.container{width:100%;max-width:1180px;margin:0 auto;padding:0 20px}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 26px;border-radius:12px;font-size:15px;font-weight:700;line-height:1.2;border:1px solid transparent;cursor:pointer;transition:transform .25s ease,box-shadow .25s ease,background .25s ease,color .25s ease,border-color .25s ease;font-family:inherit}
.btn-primary{background:linear-gradient(135deg,#3f6bff,#1e46d6);color:#fff;box-shadow:0 10px 22px rgba(43,92,255,.28)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 30px rgba(43,92,255,.34)}
.btn-primary:active{transform:translateY(0) scale(.985)}
.btn-ghost{background:#fff;color:var(--blue-deep);border-color:#c9dbff;box-shadow:0 6px 16px rgba(43,92,255,.08)}
.btn-ghost:hover{background:#eef4ff;transform:translateY(-2px);border-color:#a9c6ff}
.btn-sm{padding:9px 18px;font-size:14px;border-radius:10px}

/* 顶部导航 */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.9);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav-wrap{display:flex;align-items:center;gap:14px;min-height:68px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px;color:var(--ink);letter-spacing:.4px}
.brand .ai-page-logo{width:40px;height:auto;border-radius:9px}
.brand-text{white-space:nowrap}
.nav-links{display:flex;flex-wrap:nowrap;gap:0;margin-left:auto;align-items:center}
.nav-links a{padding:9px 11px;font-size:15px;color:var(--ink-2);border-radius:9px;white-space:nowrap;transition:color .25s ease,background .25s ease}
.nav-links a:hover{color:var(--blue);background:#eef4ff}
.nav-actions{display:flex;align-items:center;gap:10px}
.nav-toggle{display:none;width:42px;height:42px;border-radius:10px;border:1px solid var(--line-strong);background:#fff;cursor:pointer;align-items:center;justify-content:center;padding:0}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--blue-deep);position:relative;transition:background .2s ease}
.nav-toggle span::before,.nav-toggle span::after{content:"";position:absolute;left:0;width:18px;height:2px;background:var(--blue-deep);transition:transform .25s ease}
.nav-toggle span::before{top:-6px}
.nav-toggle span::after{top:6px}

/* 首屏 */
.hero{position:relative;overflow:hidden;padding:62px 0 74px}
.hero::before{content:"";position:absolute;width:460px;height:460px;right:-120px;top:-160px;border-radius:50%;background:radial-gradient(circle at 35% 35%,rgba(43,92,255,.26),rgba(43,92,255,0) 70%);animation:floatY 13s ease-in-out infinite}
.hero::after{content:"";position:absolute;width:360px;height:360px;left:-140px;bottom:-160px;border-radius:50%;background:radial-gradient(circle at 50% 50%,rgba(0,191,166,.24),rgba(0,191,166,0) 70%);animation:floatY 16s ease-in-out infinite reverse}
@keyframes floatY{0%,100%{transform:translateY(0)}50%{transform:translateY(22px)}}
.hero-inner{position:relative;z-index:2;display:grid;grid-template-columns:1.08fr .92fr;gap:46px;align-items:start}
.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:6px 14px;border-radius:999px;background:#eaf1ff;border:1px solid #d3e2ff;color:var(--blue-deep);font-size:13px;font-weight:700;letter-spacing:.3px}
.eyebrow i{width:7px;height:7px;border-radius:50%;background:var(--teal);display:inline-block;animation:pulse 2.4s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.45;transform:scale(.82)}}
.hero h1{margin-top:20px;font-size:clamp(30px,4.4vw,46px);letter-spacing:.5px;color:var(--ink)}
.hero h1 em{font-style:normal;color:var(--blue)}
.hero .lead{margin-top:16px;font-size:16.5px;color:var(--ink-3);max-width:560px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px}
.hero-meta{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}
.hero-meta span{display:inline-flex;align-items:center;gap:7px;font-size:13.5px;color:var(--ink-2);background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 13px;box-shadow:0 4px 12px rgba(24,54,120,.05)}
.hero-meta span::before{content:"";width:6px;height:6px;border-radius:2px;background:var(--teal)}
.hero-panel{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;align-content:start}
.stat{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px 18px;box-shadow:var(--card-shadow);transition:transform .3s ease,box-shadow .3s ease,border-color .3s ease}
.stat:hover{transform:translateY(-4px);box-shadow:var(--card-shadow-hover);border-color:var(--line-strong)}
.stat-num{display:block;font-size:26px;font-weight:800;color:var(--blue);letter-spacing:.5px}
.stat-label{display:block;margin-top:6px;font-size:13.5px;color:var(--ink-3);line-height:1.6}
.stat:nth-child(2) .stat-num{color:var(--teal)}
.stat:nth-child(3) .stat-num{color:var(--orange)}
.stat:nth-child(4) .stat-num{color:#7a4dff}

/* 区块 */
.section{padding:70px 0}
.section-tight{padding:46px 0}
.section-head{max-width:780px;margin-bottom:36px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.kicker{display:inline-block;font-size:13px;font-weight:800;letter-spacing:1.6px;color:var(--blue);text-transform:uppercase;margin-bottom:10px}
.section-head h2{font-size:clamp(23px,3.1vw,33px);letter-spacing:.4px}
.section-head p{margin-top:12px;font-size:15.5px;color:var(--ink-3)}

/* 网格 */
.grid{display:grid;gap:20px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}

/* 卡片 */
.card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px;box-shadow:var(--card-shadow);transition:transform .3s ease,box-shadow .3s ease,border-color .3s ease}
.card:hover{transform:translateY(-4px);box-shadow:var(--card-shadow-hover);border-color:var(--line-strong)}
.card h3{font-size:17px;margin-bottom:9px}
.card p{font-size:14.5px;color:var(--ink-3)}
.icon-chip{width:42px;height:42px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:800;color:#fff;margin-bottom:14px;background:linear-gradient(135deg,#3f6bff,#1e46d6)}
.card:nth-child(3n+2) .icon-chip{background:linear-gradient(135deg,#12d2b4,#00a894)}
.card:nth-child(3n+3) .icon-chip{background:linear-gradient(135deg,#ff9a5c,#f2661f)}

/* 标签云 */
.tag-cloud{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}
.tag-cloud span{padding:7px 14px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:13.5px;color:var(--ink-2);transition:all .25s ease}
.tag-cloud span:hover{border-color:var(--blue);color:var(--blue);transform:translateY(-2px);background:#f4f8ff}

/* 流程步骤 */
.flow{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.flow-step{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px 20px;box-shadow:var(--card-shadow);transition:transform .3s ease,box-shadow .3s ease}
.flow-step:hover{transform:translateY(-4px);box-shadow:var(--card-shadow-hover)}
.flow-step .num{width:34px;height:34px;border-radius:11px;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:800;color:#fff;background:linear-gradient(135deg,#3f6bff,#1e46d6);margin-bottom:12px}
.flow-step h3{font-size:16px;margin-bottom:8px}
.flow-step p{font-size:14px;color:var(--ink-3)}

/* 列表型 */
.check-list li{position:relative;padding-left:24px;font-size:14.5px;color:var(--ink-3);margin-bottom:11px}
.check-list li:last-child{margin-bottom:0}
.check-list li::before{content:"";position:absolute;left:0;top:9px;width:10px;height:10px;border-radius:3px;background:linear-gradient(135deg,#12d2b4,#00a894)}

/* 案例 */
.case-card{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:var(--card-shadow);transition:transform .3s ease,box-shadow .3s ease}
.case-card:hover{transform:translateY(-4px);box-shadow:var(--card-shadow-hover)}
.case-media{aspect-ratio:16/10;background:#f1f6ff;display:flex;align-items:center;justify-content:center;padding:10px}
.case-media img{width:100%;height:100%;object-fit:contain;border-radius:8px}
.case-body{padding:20px}
.case-body h3{font-size:16.5px;margin-bottom:8px}
.case-body p{font-size:14px;color:var(--ink-3)}

/* 表格 */
.table-wrap{overflow-x:auto;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--card-shadow);-webkit-overflow-scrolling:touch}
table{width:100%;border-collapse:collapse;min-width:680px}
th,td{padding:14px 18px;text-align:left;font-size:14.5px;border-bottom:1px solid #eef3fc;vertical-align:top}
thead th{background:#f4f8ff;color:var(--ink);font-weight:800;font-size:14px;white-space:nowrap}
tbody tr:last-child td{border-bottom:none}
tbody tr:hover{background:#fafcff}
td strong{color:var(--blue-deep)}
.col-highlight{color:var(--blue-deep);font-weight:700}

/* 评分卡 */
.score-card{display:grid;grid-template-columns:auto 1fr;gap:26px;align-items:center;background:linear-gradient(135deg,#eef4ff,#f4fbf8);border:1px solid var(--line-strong);border-radius:18px;padding:28px;margin-bottom:24px}
.score-num{font-size:52px;font-weight:800;color:var(--blue);line-height:1;letter-spacing:-1px}
.score-num small{font-size:16px;color:var(--ink-3);font-weight:700;margin-left:4px}
.score-stars{color:#ff9628;font-size:19px;letter-spacing:3px}
.score-title{font-size:17px;font-weight:800;color:var(--ink);margin-bottom:6px}
.score-desc{font-size:14.5px;color:var(--ink-3)}

/* 评论 */
.review-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px;box-shadow:var(--card-shadow);display:flex;flex-direction:column;transition:transform .3s ease,box-shadow .3s ease}
.review-card:hover{transform:translateY(-4px);box-shadow:var(--card-shadow-hover)}
.review-text{font-size:14.5px;color:var(--ink-2);flex:1}
.review-user{display:flex;align-items:center;gap:12px;margin-top:18px;padding-top:16px;border-top:1px dashed var(--line)}
.avatar{width:40px;height:40px;border-radius:12px;background:linear-gradient(135deg,#3f6bff,#1e46d6);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px;flex-shrink:0}
.review-user strong{display:block;font-size:14.5px;color:var(--ink)}
.review-user span{display:block;font-size:12.5px;color:var(--ink-3)}

/* 表单 */
.form-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:30px;box-shadow:var(--card-shadow)}
.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.form-item{display:flex;flex-direction:column;gap:8px}
.form-item.full{grid-column:1/-1}
.form-item label{font-size:14px;font-weight:700;color:var(--ink)}
.form-item input,.form-item select,.form-item textarea{width:100%;padding:12px 14px;font-size:14.5px;font-family:inherit;color:var(--ink);background:#f8fbff;border:1px solid var(--line-strong);border-radius:11px;transition:border-color .25s ease,background .25s ease,box-shadow .25s ease}
.form-item textarea{resize:vertical;min-height:120px}
.form-item input:focus,.form-item select:focus,.form-item textarea:focus{outline:none;border-color:var(--blue);background:#fff;box-shadow:0 0 0 3px rgba(43,92,255,.12)}
.form-actions{grid-column:1/-1;display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-top:4px}
.form-note{font-size:13px;color:var(--ink-3)}

/* FAQ */
.faq-list{display:grid;gap:12px}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 6px 18px rgba(24,54,120,.05);overflow:hidden;transition:border-color .25s ease,box-shadow .25s ease}
.faq-item.open{border-color:var(--line-strong);box-shadow:var(--card-shadow)}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:17px 22px;background:none;border:none;text-align:left;font-family:inherit;font-size:15.5px;font-weight:700;color:var(--ink);cursor:pointer}
.faq-icon{position:relative;width:16px;height:16px;flex-shrink:0}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;background:var(--blue);border-radius:2px;transition:transform .3s ease}
.faq-icon::before{left:0;top:7px;width:16px;height:2px}
.faq-icon::after{left:7px;top:0;width:2px;height:16px}
.faq-item.open .faq-icon::after{transform:rotate(90deg);opacity:0}
.faq-a{max-height:0;overflow:hidden;transition:max-height .38s ease}
.faq-a p{padding:0 22px 18px;font-size:14.5px;color:var(--ink-3)}

/* 联系方式 */
.contact-card{display:grid;grid-template-columns:1.2fr .8fr;gap:26px;align-items:start}
.contact-list li{display:flex;gap:12px;padding:12px 0;border-bottom:1px dashed var(--line);font-size:14.5px;color:var(--ink-2)}
.contact-list li:last-child{border-bottom:none}
.contact-list b{color:var(--ink);min-width:82px;display:inline-block;font-weight:700}
.qr-box{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px;text-align:center;box-shadow:var(--card-shadow)}
.qr-box img{width:100%;max-width:190px;height:auto;margin:0 auto 12px;border-radius:10px}
.qr-box p{font-size:13.5px;color:var(--ink-3)}

/* 文章 */
.article-list{display:grid;gap:12px}
.article-list a{display:flex;align-items:center;gap:12px;padding:14px 18px;background:#fff;border:1px solid var(--line);border-radius:12px;font-size:14.5px;color:var(--ink-2);transition:all .25s ease}
.article-list a:hover{border-color:var(--blue);color:var(--blue);transform:translateX(3px);box-shadow:0 8px 20px rgba(24,54,120,.08)}
.article-list a::before{content:"";width:7px;height:7px;border-radius:2px;background:var(--teal);flex-shrink:0}

/* 页脚 */
.site-footer{background:#0d1a33;color:#c2d2ee;padding:50px 0 22px;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px}
.site-footer h3{color:#fff;font-size:16px;margin-bottom:14px}
.site-footer p{font-size:14px;color:#a9bcdd;line-height:1.8}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.footer-brand img{width:38px;height:auto;border-radius:9px}
.footer-brand strong{color:#fff;font-size:17px}
.footer-links{display:grid;gap:9px}
.footer-links a{font-size:14px;color:#a9bcdd;transition:color .25s ease}
.footer-links a:hover{color:#fff}
.footer-contact li{font-size:14px;color:#a9bcdd;margin-bottom:9px}
.footer-contact b{color:#e6eeff;font-weight:700}
.friend-links{margin-top:32px;padding-top:22px;border-top:1px solid rgba(255,255,255,.1)}
.friend-links h3{color:#fff;font-size:15px;margin-bottom:12px}
.friend-links .link-row{display:flex;flex-wrap:wrap;gap:10px 18px}
.friend-links a{font-size:13.5px;color:#a9bcdd;transition:color .25s ease}
.friend-links a:hover{color:#fff}
.footer-bottom{margin-top:24px;padding-top:18px;border-top:1px solid rgba(255,255,255,.1);display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:13px;color:#8ea4c9}
.footer-bottom a{color:#a9bcdd}
.footer-bottom a:hover{color:#fff}

/* 浮动客服与返回顶部 */
.float-kf{position:fixed;right:20px;bottom:88px;z-index:120;display:flex;flex-direction:column;align-items:flex-end;gap:10px}
.kf-btn{width:54px;height:54px;border-radius:16px;border:none;background:linear-gradient(135deg,#3f6bff,#1e46d6);color:#fff;font-size:13px;font-weight:800;cursor:pointer;box-shadow:0 12px 26px rgba(43,92,255,.34);transition:transform .25s ease}
.kf-btn:hover{transform:translateY(-3px)}
.kf-panel{width:206px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px;box-shadow:0 16px 36px rgba(20,40,90,.16);display:none;text-align:center}
.kf-panel.open{display:block;animation:fadeUp .28s ease}
@keyframes fadeUp{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
.kf-panel img{width:100%;max-width:150px;height:auto;margin:0 auto 10px;border-radius:9px}
.kf-panel p{font-size:12.5px;color:var(--ink-3);line-height:1.7}
.to-top{position:fixed;right:20px;bottom:22px;z-index:120;width:50px;height:50px;border-radius:14px;border:1px solid var(--line-strong);background:#fff;color:var(--blue-deep);font-size:12px;font-weight:800;cursor:pointer;box-shadow:0 10px 22px rgba(24,54,120,.14);opacity:0;visibility:hidden;transform:translateY(8px);transition:all .3s ease}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:#eef4ff}

/* 动画 */
.js-ready .reveal{opacity:0;transform:translateY(20px)}
.js-ready .reveal.visible{opacity:1;transform:none;transition:opacity .65s ease,transform .65s ease}

/* 响应式 */
@media(max-width:991px){
  .nav-toggle{display:inline-flex}
  .brand{margin-right:auto}
  .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:10px 20px 18px;box-shadow:0 18px 30px rgba(20,40,90,.08);margin-left:0}
  .nav-links.open{display:flex;animation:fadeUp .25s ease}
  .nav-links a{padding:12px 8px;border-radius:9px;font-size:15px}
  .hero-inner{grid-template-columns:1fr;gap:34px}
  .flow{grid-template-columns:repeat(2,1fr)}
  .grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}
  .contact-card{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .score-card{grid-template-columns:1fr;gap:16px}
}
@media(max-width:640px){
  .section{padding:50px 0}
  .section-tight{padding:36px 0}
  .hero{padding:44px 0 54px}
  .grid-2,.grid-3,.grid-4,.flow{grid-template-columns:1fr}
  .form-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .hero-panel{grid-template-columns:repeat(2,1fr)}
  .btn{padding:12px 22px;font-size:14.5px}
  .hero-actions .btn{flex:1 1 auto}
  .form-card{padding:22px}
  .float-kf{right:14px;bottom:82px}
  .to-top{right:14px;bottom:18px;width:46px;height:46px}
}