:root{
    --c1:#6366f1;   /* 靛蓝 */
    --c2:#ec4899;   /* 品红 */
    --c3:#f59e0b;   /* 琥珀 */
    --c4:#10b981;   /* 翠绿 */
    --c5:#0ea5e9;   /* 天蓝 */
    --navy:#101433;
    --ink:#1f2937;
    --muted:#64748b;
    --line:#e8ecf5;
    --bg-alt:#f7f9fd;
    --radius:18px;
    --shadow:0 18px 40px rgba(16,20,51,.10);
    --shadow-lg:0 26px 60px rgba(16,20,51,.16);
    --maxw:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
    font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans CN",system-ui,sans-serif;
    color:var(--ink);background:#fff;line-height:1.75;-webkit-font-smoothing:antialiased;
}
a{text-decoration:none;color:inherit}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 22px}
img{max-width:100%}

/* 通用按钮 */
.btn{display:inline-block;padding:13px 30px;border-radius:999px;font-weight:600;font-size:15px;transition:.25s;cursor:pointer;border:1px solid transparent}
.btn-primary{background:linear-gradient(100deg,var(--c1),var(--c2) 55%,var(--c3));color:#fff;box-shadow:0 12px 26px rgba(99,102,241,.32)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 36px rgba(236,72,153,.34)}
.btn-ghost{border-color:rgba(255,255,255,.55);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.14);transform:translateY(-2px)}

/* 导航 */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line);transition:.3s}
.nav.scrolled{box-shadow:0 6px 24px rgba(16,20,51,.10)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700}
.brand-mark{display:inline-flex}
.brand-text{font-size:19px;color:var(--navy);letter-spacing:.5px;display:flex;flex-direction:column;line-height:1}
.brand-text i{font-style:normal;font-size:9px;letter-spacing:1.6px;color:var(--c2);font-weight:600;margin-top:3px}
.menu{display:flex;gap:26px}
.menu a{color:var(--ink);font-weight:500;font-size:15px;position:relative;padding:6px 0;transition:.2s}
.menu a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;background:linear-gradient(90deg,var(--c1),var(--c2),var(--c3));transition:.25s}
.menu a:hover{color:var(--c1)}
.menu a:hover::after{width:100%}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{width:24px;height:2px;background:var(--navy);border-radius:2px;transition:.3s}

/* Hero */
.hero{position:relative;overflow:hidden;color:#fff;background:linear-gradient(135deg,#111a45 0%,#1c2a6b 45%,#2a1a5c 100%);padding:118px 0 150px}
.hero-bg{position:absolute;inset:0;background:
  radial-gradient(820px 380px at 82% -8%,rgba(236,72,153,.42),transparent 60%),
  radial-gradient(760px 420px at 12% 18%,rgba(99,102,241,.42),transparent 62%),
  radial-gradient(680px 380px at 55% 105%,rgba(16,185,129,.30),transparent 62%);
  opacity:.95}
.hero-inner{position:relative;text-align:center;z-index:2}
.hero-eyebrow{letter-spacing:3px;font-size:12px;color:#bcd0ff;margin-bottom:18px}
.hero-title{font-size:46px;font-weight:800;letter-spacing:1px;line-height:1.25;text-shadow:0 6px 30px rgba(0,0,0,.28)}
.hero-sub{font-size:20px;margin-top:14px;font-weight:800;background:linear-gradient(90deg,#a5b4fc,#f9a8d4,#fcd34d);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-desc{margin-top:20px;font-size:16px;color:#dbe4ff;line-height:2}
.hero-desc span{font-weight:700;background:linear-gradient(90deg,#7dd3fc,#fcd34d);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-btns{margin-top:34px;display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.hero-tags{list-style:none;margin-top:34px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.hero-tags li{font-size:13.5px;color:#e6ecff;padding:7px 16px;border-radius:999px;border:1px solid rgba(255,255,255,.28);background:rgba(255,255,255,.08)}
.hero-wave{position:absolute;left:0;right:0;bottom:-1px;height:60px;background:radial-gradient(120% 100% at 50% 100%,#fff 40%,transparent 41%);z-index:1}

/* 通用 section */
.section{padding:84px 0}
.section-alt{background:var(--bg-alt)}
.section-head{text-align:center;max-width:760px;margin:0 auto 48px}
.section-tag{display:inline-block;font-size:12px;letter-spacing:3px;font-weight:700;margin-bottom:10px;background:linear-gradient(90deg,var(--c1),var(--c2));-webkit-background-clip:text;background-clip:text;color:transparent}
.section-head h2{font-size:32px;color:var(--navy);font-weight:800;position:relative;display:inline-block}
.section-head h2::after{content:"";display:block;width:56px;height:4px;border-radius:2px;margin:12px auto 0;background:linear-gradient(90deg,var(--c1),var(--c2),var(--c3))}
.section-lead{color:var(--muted);margin-top:10px;font-size:15px}

/* 关于 */
.about-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:46px;align-items:center}
.about-text p{color:var(--ink);margin-bottom:14px}
.about-list{list-style:none;margin-top:18px;display:grid;gap:12px}
.about-list li{position:relative;padding-left:28px;color:var(--ink)}
.about-list li::before{content:"";position:absolute;left:0;top:10px;width:13px;height:13px;border-radius:50%;background:linear-gradient(135deg,var(--c1),var(--c2))}
.about-stats{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;text-align:center;box-shadow:var(--shadow);transition:.25s}
.stat:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.stat b{display:block;font-size:36px;font-weight:800;line-height:1;background:linear-gradient(135deg,var(--c1),var(--c5));-webkit-background-clip:text;background-clip:text;color:transparent}
.stat:nth-child(2) b{background:linear-gradient(135deg,var(--c2),var(--c3));-webkit-background-clip:text;background-clip:text}
.stat:nth-child(3) b{background:linear-gradient(135deg,var(--c4),var(--c5));-webkit-background-clip:text;background-clip:text}
.stat:nth-child(4) b{background:linear-gradient(135deg,var(--c3),var(--c2));-webkit-background-clip:text;background-clip:text}
.stat span{display:block;margin-top:8px;color:var(--muted);font-size:14px}

/* 服务卡片 */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:34px 28px;box-shadow:var(--shadow);transition:.28s;position:relative;overflow:hidden}
.card::before{content:"";position:absolute;left:0;right:0;top:0;height:4px;background:linear-gradient(90deg,var(--a1,var(--c1)),var(--a2,var(--c2)))}
.card:nth-child(1){--a1:#6366f1;--a2:#0ea5e9}
.card:nth-child(2){--a1:#ec4899;--a2:#f59e0b}
.card:nth-child(3){--a1:#10b981;--a2:#6366f1}
.card:hover{transform:translateY(-6px);border-color:transparent;box-shadow:var(--shadow-lg)}
.card-icon{width:58px;height:58px;border-radius:16px;background:linear-gradient(135deg,var(--a1,var(--c1)),var(--a2,var(--c2)));display:flex;align-items:center;justify-content:center;margin-bottom:18px;box-shadow:0 10px 22px rgba(99,102,241,.22)}
.card h3{font-size:20px;color:var(--navy);margin-bottom:12px}
.card p{color:var(--muted);font-size:14.5px;margin-bottom:16px}
.card-list{list-style:none;display:grid;gap:9px}
.card-list li{position:relative;padding-left:22px;font-size:14px;color:var(--ink)}
.card-list li::before{content:"✓";position:absolute;left:0;top:0;color:var(--a1,var(--c1));font-weight:700}

/* 品类展厅 */
.tiles{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.tile{position:relative;overflow:hidden;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px;box-shadow:var(--shadow);transition:.28s}
.tile::before{content:"";position:absolute;inset:auto -30% -60% -30%;height:120px;background:linear-gradient(120deg,var(--t1,var(--c1)),var(--t2,var(--c2)));opacity:.10;transition:.28s}
.tile:nth-child(8n+1){--t1:#6366f1;--t2:#0ea5e9}
.tile:nth-child(8n+2){--t1:#ec4899;--t2:#f59e0b}
.tile:nth-child(8n+3){--t1:#10b981;--t2:#0ea5e9}
.tile:nth-child(8n+4){--t1:#f59e0b;--t2:#ec4899}
.tile:nth-child(8n+5){--t1:#8b5cf6;--t2:#6366f1}
.tile:nth-child(8n+6){--t1:#0ea5e9;--t2:#10b981}
.tile:nth-child(8n+7){--t1:#f43f5e;--t2:#f59e0b}
.tile:nth-child(8n+8){--t1:#14b8a6;--t2:#6366f1}
.tile:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.tile:hover::before{opacity:.18}
.tile-ico{position:relative;display:inline-flex;width:52px;height:52px;border-radius:15px;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--t1,var(--c1)),var(--t2,var(--c2)));box-shadow:0 10px 22px rgba(16,20,51,.16);margin-bottom:16px}
.tile h4{position:relative;font-size:17px;color:var(--navy);margin-bottom:8px}
.tile p{position:relative;color:var(--muted);font-size:14px}

/* 服务流程 */
.steps{list-style:none;display:grid;grid-template-columns:repeat(6,1fr);gap:18px;counter-reset:s}
.step{position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px 20px;box-shadow:var(--shadow);transition:.25s}
.step:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}
.step-no{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:12px;font-size:15px;font-weight:800;color:#fff;background:linear-gradient(135deg,var(--c1),var(--c2));margin-bottom:14px}
.step:nth-child(2) .step-no{background:linear-gradient(135deg,var(--c2),var(--c3))}
.step:nth-child(3) .step-no{background:linear-gradient(135deg,var(--c4),var(--c5))}
.step:nth-child(4) .step-no{background:linear-gradient(135deg,var(--c3),var(--c2))}
.step:nth-child(5) .step-no{background:linear-gradient(135deg,var(--c5),var(--c1))}
.step:nth-child(6) .step-no{background:linear-gradient(135deg,var(--c1),var(--c4))}
.step h4{font-size:16px;color:var(--navy);margin-bottom:8px}
.step p{font-size:13.5px;color:var(--muted)}

/* 优势 */
.adv-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.adv{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;box-shadow:var(--shadow);transition:.25s}
.adv:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}
.adv b{font-size:30px;font-weight:800;background:linear-gradient(135deg,var(--c1),var(--c2));-webkit-background-clip:text;background-clip:text;color:transparent}
.adv:nth-child(2) b{background:linear-gradient(135deg,var(--c3),var(--c2));-webkit-background-clip:text;background-clip:text}
.adv:nth-child(3) b{background:linear-gradient(135deg,var(--c4),var(--c5));-webkit-background-clip:text;background-clip:text}
.adv:nth-child(4) b{background:linear-gradient(135deg,var(--c5),var(--c1));-webkit-background-clip:text;background-clip:text}
.adv h4{margin:10px 0 8px;font-size:18px;color:var(--navy)}
.adv p{color:var(--muted);font-size:14px}

/* 常见问题 */
.faq-list{max-width:820px;margin:0 auto;display:grid;gap:14px}
.faq{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 22px;box-shadow:var(--shadow);transition:.25s}
.faq[open]{border-color:transparent;box-shadow:var(--shadow-lg)}
.faq summary{cursor:pointer;font-size:16px;font-weight:600;color:var(--navy);list-style:none;display:flex;align-items:center;justify-content:space-between;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:20px;font-weight:700;line-height:1;background:linear-gradient(135deg,var(--c1),var(--c2));-webkit-background-clip:text;background-clip:text;color:transparent}
.faq[open] summary::after{content:"−"}
.faq p{margin-top:12px;color:var(--muted);font-size:14.5px}

/* 联系 */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:start}
.contact-info{display:grid;gap:16px}
.c-item{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 22px;box-shadow:var(--shadow);border-left:4px solid var(--c1)}
.c-item:nth-child(2){border-left-color:var(--c2)}
.c-item:nth-child(3){border-left-color:var(--c3)}
.c-item:nth-child(4){border-left-color:var(--c4)}
.c-item:nth-child(5){border-left-color:var(--c5)}
.c-label{display:block;font-size:12px;color:var(--c1);font-weight:700;letter-spacing:1px;margin-bottom:6px}
.c-value{font-size:16px;color:var(--navy);font-weight:600}
.contact-form{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);display:grid;gap:14px}
.contact-form input,.contact-form textarea{width:100%;border:1px solid var(--line);border-radius:10px;padding:13px 15px;font-size:15px;font-family:inherit;color:var(--ink);background:#fbfcff;transition:.2s;resize:vertical}
.contact-form input:focus,.contact-form textarea:focus{outline:none;border-color:var(--c1);box-shadow:0 0 0 3px rgba(99,102,241,.15)}
.form-tip{font-size:12px;color:var(--muted);margin-top:2px}

/* 页脚 */
.footer{background:linear-gradient(135deg,#111a45 0%,#1c2a6b 60%,#2a1a5c 100%);color:#dbe4ff;padding:54px 0 22px}
.footer-inner{display:flex;justify-content:space-between;flex-wrap:wrap;gap:26px;padding-bottom:26px;border-bottom:1px solid rgba(255,255,255,.14)}
.footer-brand .brand-text{color:#fff}
.footer-brand .brand-text i{color:#f9a8d4}
.footer-brand p{margin-top:12px;color:#a9b8e8;font-size:14px;max-width:340px}
.footer-links{display:flex;gap:24px;flex-wrap:wrap;align-items:center}
.footer-links a{color:#dbe4ff;font-size:14px;transition:.2s}
.footer-links a:hover{color:#fcd34d}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;padding-top:18px;color:#97a6d6;font-size:13px}
.footer-bottom a{color:#97a6d6;border-bottom:1px dashed rgba(151,166,214,.5)}
.footer-bottom a:hover{color:#fcd34d}

/* 进入视口渐显（由 script.js 添加 .reveal / .in） */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .5s ease,transform .5s ease}
.reveal.in{opacity:1;transform:none}

/* 返回顶部 */
.to-top{position:fixed;right:22px;bottom:22px;width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--c1),var(--c2));color:#fff;display:flex;align-items:center;justify-content:center;font-size:20px;box-shadow:0 10px 24px rgba(99,102,241,.42);opacity:0;visibility:hidden;transition:.3s;z-index:40}
.to-top.show{opacity:1;visibility:visible}

/* 响应式 */
@media(max-width:1080px){
    .tiles{grid-template-columns:repeat(3,1fr)}
    .steps{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:960px){
    .menu{gap:18px}
    .menu a{font-size:14px}
    .about-grid{grid-template-columns:1fr;gap:30px}
    .cards{grid-template-columns:1fr}
    .adv-grid{grid-template-columns:1fr 1fr}
    .contact-grid{grid-template-columns:1fr}
}
@media(max-width:760px){
    .tiles{grid-template-columns:repeat(2,1fr)}
    .steps{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:640px){
    .menu{position:fixed;top:68px;left:0;right:0;background:#fff;flex-direction:column;gap:0;padding:10px 22px 18px;border-bottom:1px solid var(--line);transform:translateY(-120%);transition:.3s;box-shadow:0 12px 30px rgba(16,20,51,.14)}
    .menu.open{transform:translateY(0)}
    .menu a{padding:12px 0;border-bottom:1px solid var(--line)}
    .menu a::after{display:none}
    .nav-toggle{display:flex}
    .hero{padding:88px 0 118px}
    .hero-title{font-size:30px}
    .hero-sub{font-size:17px}
    .section{padding:60px 0}
    .section-head h2{font-size:26px}
    .adv-grid{grid-template-columns:1fr}
    .about-stats{grid-template-columns:1fr 1fr}
}
@media(max-width:420px){
    .tiles{grid-template-columns:1fr}
    .steps{grid-template-columns:1fr}
    .brand-text{font-size:17px}
}
@media (prefers-reduced-motion:reduce){
    *{animation:none!important;transition:none!important}
    html{scroll-behavior:auto}
}