:root{
  --blue:#00A2ED;        /* 主品牌亮蓝 */
  --blue-2:#0091D4;      /* 按钮/深一档蓝 */
  --blue-3:#39B8F2;      /* 渐变端亮蓝 */
  --sky:#E9F7FE;         /* 浅蓝分区 */
  --sky-2:#D4EFFC;
  --yellow:#FFDD00;      /* 强调明黄 */
  --yellow-2:#FFE566;
  --ink:#24384A;         /* 墨灰标题 */
  --gray:#5A6C7A;        /* 正文灰 */
  --gray-2:#3D515E;
  --line:#D9E9F2;
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",sans-serif;color:var(--ink);line-height:1.7;background:#fff;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}
.hero{position:relative;color:#fff;overflow:hidden;padding:124px 0 102px}
.hero-bg{position:absolute;inset:0;background:url("https://www.lantuchuanbo.com/wp-content/uploads/2026/09/lantu-hero-bg.jpg") center/cover no-repeat}
.hero-bg::after{content:'';position:absolute;inset:0;background:linear-gradient(105deg,rgba(0,130,200,.97) 0%,rgba(0,150,225,.90) 40%,rgba(0,162,237,.72) 66%,rgba(27,140,205,.45) 100%)}
.hero .wrap{position:relative;z-index:2;text-align:center}
.hero-tag{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.30);padding:6px 16px;border-radius:30px;font-size:13px;letter-spacing:1px;color:#eff8ff;margin-bottom:26px}
.hero-tag b{color:var(--yellow)}
.hero h1{font-size:50px;line-height:1.22;font-weight:800;letter-spacing:-.6px;margin-bottom:20px;color:#fff!important}
.hero h1 span{color:var(--yellow)}
.hero .sub{font-size:19px;color:#dceffc;max-width:720px;margin:0 auto 30px;line-height:1.8}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap;justify-content:center}
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 30px;border-radius:6px;font-weight:600;font-size:15px;transition:all .2s;cursor:pointer}
.btn-primary{background:var(--yellow);color:#1b3a52;box-shadow:0 6px 18px rgba(255,221,0,.35)}
.btn-primary:hover{background:#ffd400;transform:translateY(-2px)}
.btn-ghost{background:rgba(255,255,255,.14);color:#fff;border:1px solid rgba(255,255,255,.35)}
.btn-ghost:hover{background:rgba(255,255,255,.24)}
.hero-meta{margin-top:44px;display:flex;gap:36px;flex-wrap:wrap;padding-top:30px;border-top:1px solid rgba(255,255,255,.20)}
.hero-meta div b{font-size:26px;color:#fff}
.hero-meta div span{display:block;font-size:13px;color:#c2e6f8;margin-top:2px}
.pain-row{display:flex;gap:10px;flex-wrap:wrap;margin:0 0 28px;justify-content:center}
.pain-chip{background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.28);color:#ecf6fd;border-radius:8px;padding:10px 16px;font-size:13px;line-height:1.55}
.pain-chip::before{content:'';display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--yellow);margin-right:8px;vertical-align:2px}
.sec{padding:82px 0}
.sec-head{text-align:center;margin-bottom:48px}
.sec-kicker{display:inline-block;color:var(--blue-2);font-size:13px;font-weight:700;letter-spacing:3px;text-transform:uppercase;margin-bottom:12px}
.sec-head h2{font-size:36px;font-weight:800;color:var(--ink);letter-spacing:-.5px}
.sec-head p{color:var(--gray);max-width:640px;margin:14px auto 0;font-size:15px}
.sec-line{width:54px;height:3px;background:linear-gradient(90deg,var(--blue),var(--blue-3));border-radius:2px;margin:16px auto 0}
.philosophy{background:var(--sky);padding:66px 0}
.phil-inner{text-align:center;max-width:820px;margin:0 auto}
.phil-inner .big{font-size:28px;font-weight:800;color:var(--ink);line-height:1.6;margin-bottom:18px}
.phil-inner .big em{font-style:normal;color:var(--blue-2)}
.phil-inner p{color:var(--gray);font-size:16px;line-height:1.9}
.phil-flow{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin-top:34px}
.phil-flow .step{background:#fff;border:1px solid var(--line);border-radius:30px;padding:10px 22px;font-size:14px;font-weight:600;color:var(--ink)}
.phil-flow .step b{color:var(--blue-2)}
.phil-flow .step:last-child{border-color:var(--yellow);color:var(--blue-2);background:#fffbe6}
.phil-flow .step:last-child b{color:var(--yellow)}
.phil-flow .step:last-child span,.phil-flow .step:last-child{color:#b8860b}
.svc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.svc-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:38px 30px;position:relative;overflow:hidden;transition:all .3s}
.svc-card::before{content:'';position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--blue),var(--blue-3));transition:height .3s}
.svc-card:hover{transform:translateY(-6px);box-shadow:0 16px 40px rgba(0,130,200,.12);border-color:#bfe6f7}
.svc-card:hover::before{height:7px}
.svc-icon{width:68px;height:68px;border-radius:16px;background:linear-gradient(135deg,var(--blue-3),var(--blue));display:flex;align-items:center;justify-content:center;font-size:30px;margin-bottom:22px;box-shadow:0 8px 20px rgba(0,150,225,.30)}
.svc-card h3{font-size:22px;font-weight:800;color:var(--ink);margin-bottom:6px}
.svc-card .tag{display:inline-block;font-size:12px;color:var(--blue-2);background:var(--sky);padding:3px 12px;border-radius:20px;font-weight:600;margin-bottom:14px}
.svc-card p{font-size:14px;color:var(--gray);line-height:1.8;margin-bottom:20px}
.svc-card .link{font-size:14px;font-weight:600;color:var(--blue-2);display:inline-flex;align-items:center;gap:6px}
.svc-card .link:hover{color:var(--ink)}
.sub-list{background:var(--sky)}
.sub-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.sub-item{background:#fff;border:1px solid var(--line);border-radius:12px;padding:28px 24px;transition:all .25s;position:relative}
.sub-item:hover{box-shadow:0 10px 26px rgba(0,130,200,.08);border-color:#bfe6f7;transform:translateY(-3px)}
.sub-item .no{position:absolute;top:22px;right:22px;font-size:34px;font-weight:800;color:var(--sky-2);line-height:1}
.sub-item .ic{width:48px;height:48px;border-radius:12px;background:var(--sky);color:var(--blue-2);display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.svc-icon svg,.sub-item .ic svg{display:block}
.btn svg{vertical-align:-2px}
.sub-item h4{font-size:19px;font-weight:700;color:var(--ink);margin-bottom:6px}
.sub-item .sub-tag{font-size:12px;color:var(--blue-2);font-weight:600;margin-bottom:10px;display:block}
.sub-item p{font-size:13.5px;color:var(--gray);line-height:1.75}
.stats{background:linear-gradient(135deg,var(--blue-2) 0%,var(--blue-3) 100%);color:#fff;padding:64px 0;position:relative;overflow:hidden}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;text-align:center;position:relative;z-index:2}
.stat-num{font-size:52px;font-weight:800;color:#fff;line-height:1;margin-bottom:10px}
.stat-num em{font-style:normal;color:var(--yellow)}
.stat-label{font-size:14px;color:#d9effc}
.logic-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:0;background:#fff}
.logic-step{text-align:center;padding:30px 20px;border:1px solid var(--line);border-radius:12px;position:relative}
.logic-step .n{width:42px;height:42px;border-radius:50%;background:linear-gradient(135deg,var(--blue-3),var(--blue));color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;margin:0 auto 14px;font-size:16px}
.logic-step h4{font-size:16px;font-weight:700;color:var(--ink);margin-bottom:8px}
.logic-step p{font-size:12.5px;color:var(--gray);line-height:1.6}
.quote-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.quote-card{background:#fff;border:1px solid var(--line);border-left:4px solid var(--blue-2);border-radius:12px;padding:30px 28px;box-shadow:0 4px 16px rgba(0,130,200,.05)}
.quote-card .stars{color:var(--yellow);letter-spacing:2px;margin-bottom:14px;font-size:14px}
.quote-card p{font-size:14.5px;color:var(--gray-2);line-height:1.9;margin-bottom:16px;font-style:italic}
.quote-card .who{font-size:14px;font-weight:700;color:var(--ink)}
.quote-card .who span{display:block;font-weight:400;color:var(--gray);font-size:12.5px;margin-top:2px}
.clients-note{text-align:center;color:var(--gray);font-size:15px;margin-bottom:16px}
.cta-band{text-align:center;padding:0 0 76px}
.cta-card{background:linear-gradient(135deg,var(--blue-2),var(--blue-3));border-radius:18px;padding:52px 40px;color:#fff;position:relative;overflow:hidden}
.cta-card::after{content:'';position:absolute;right:-60px;bottom:-60px;width:260px;height:260px;border-radius:50%;background:radial-gradient(circle,rgba(255,221,0,.35),transparent 70%)}
.cta-card h3{font-size:28px;font-weight:800;margin-bottom:12px;position:relative;z-index:2}
.cta-card p{color:#dfF1fd;margin-bottom:26px;position:relative;z-index:2}
.cta-card .btn-primary{position:relative;z-index:2}
.blog-note{text-align:center;color:var(--gray);margin-bottom:20px}
@media(max-width:960px){
  .svc-grid,.sub-grid{grid-template-columns:repeat(2,1fr)}
  .logic-grid{grid-template-columns:repeat(2,1fr);gap:14px}
}
@media(max-width:640px){
  .svc-grid,.sub-grid,.quote-grid,.stats-grid{grid-template-columns:1fr}
  .logic-grid{grid-template-columns:1fr 1fr}
  .hero h1{font-size:32px}
  .hero{padding:64px 0}
  .sec{padding:54px 0}
  .sec-head h2{font-size:27px}
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:26px}
}
.tvoc{background:#fff}
.tvoc-inner{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.tvoc-left .sec-kicker{color:var(--blue-2)}
.tvoc-left h2{font-size:32px;font-weight:800;color:var(--ink);line-height:1.4;margin-bottom:16px}
.tvoc-left h2 em{font-style:normal;color:var(--blue-2)}
.tvoc-desc{color:var(--gray);font-size:15.5px;line-height:1.9;margin-bottom:24px}
.tvoc-pill{display:flex;gap:12px;flex-wrap:wrap}
.tvoc-pill span{background:var(--sky);color:var(--ink);border:1px solid var(--line);padding:9px 18px;border-radius:30px;font-size:14px;font-weight:600}
.tvoc-pill span:last-child{background:#fffbe6;border-color:var(--yellow);color:#b8860b}
.tvoc-right{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.tvoc-card{background:linear-gradient(150deg,var(--blue-2),var(--blue-3));border-radius:16px;padding:26px 22px;color:#fff;position:relative;overflow:hidden;min-height:120px}
.tvoc-card::after{content:'';position:absolute;right:-30px;bottom:-30px;width:110px;height:110px;border-radius:50%;background:radial-gradient(circle,rgba(255,221,0,.35),transparent)}
.tvoc-card b{font-size:40px;font-weight:800;color:var(--yellow);display:block;line-height:1;margin-bottom:10px}
.tvoc-card span{font-size:13.5px;color:#dff1fd;line-height:1.6;position:relative;z-index:1}
.tvoc-card:first-child{background:linear-gradient(150deg,var(--yellow),#ffcc00);}
.tvoc-card:first-child b{color:#1b3a52}
.tvoc-card:first-child span{color:#3d5a70}
.trust{background:linear-gradient(135deg,#f7fcfe,var(--sky))}
.trust-row{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-bottom:38px}
.trust-item{background:#fff;border:1px solid var(--line);border-radius:14px;padding:28px 20px;text-align:center;transition:all .25s}
.trust-item:hover{box-shadow:0 12px 30px rgba(0,130,200,.10);transform:translateY(-3px)}
.trust-item b{font-size:34px;font-weight:800;color:var(--blue-2);display:block;line-height:1;margin-bottom:8px}
.trust-item b em{font-style:normal;color:var(--green,#12a150)}
.trust-item span{font-size:13.5px;color:var(--gray)}
.clients-band{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px 28px;display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.clients-band span{color:var(--gray);font-size:13.5px}
.clients-band b{background:var(--sky);color:var(--ink);border:1px solid var(--line);padding:7px 18px;border-radius:26px;font-size:14px;font-weight:600}
.faq-list{max-width:860px;margin:0 auto}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:12px;margin-bottom:14px;overflow:hidden}
.faq-item summary{cursor:pointer;list-style:none;padding:20px 26px;font-size:16px;font-weight:700;color:var(--ink);display:flex;align-items:center;justify-content:space-between;transition:color .2s}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:'+';font-size:22px;font-weight:400;color:var(--blue-2);transition:transform .2s}
.faq-item[open] summary::after{transform:rotate(45deg);color:var(--yellow)}
.faq-item p{padding:0 26px 20px;font-size:14.5px;color:var(--gray);line-height:1.85}
.contact-band{background:linear-gradient(135deg,var(--blue-2),var(--blue-3));color:#fff;padding:46px 0}
.contact-inner{display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap}
.contact-inner b{font-size:19px;display:block;margin-bottom:4px}
.contact-inner span{color:#dff1fd;font-size:14px}
@media(max-width:960px){
  .tvoc-inner{grid-template-columns:1fr;gap:32px}
  .trust-row{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:640px){
  .trust-row{grid-template-columns:1fr 1fr;gap:14px}
  .tvoc-right{grid-template-columns:1fr}
}