/* ============ 班承智能官网 · 设计系统 ============ */
:root{
  --accent:#00E0C6;
  --accent-2:#3B82F6;
  --accent-3:#7C5CFF;
  --ink:#0A1020;
  --ink-2:#0F1830;
  --ink-3:#16213f;
  --text:#0f172a;
  --text-soft:#475569;
  --text-mute:#94a3b8;
  --bg:#ffffff;
  --bg-soft:#f5f8fc;
  --border:#e6ecf5;
  --radius:16px;
  --radius-sm:10px;
  --maxw:1180px;
  --shadow:0 18px 50px -20px rgba(15,23,42,.25);
  --font:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--text);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 22px}

/* ---- 按钮 ---- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 22px;border-radius:999px;font-weight:600;font-size:15px;cursor:pointer;border:1px solid transparent;transition:.25s;white-space:nowrap}
.btn svg{width:18px;height:18px}
.btn-primary{background:linear-gradient(120deg,var(--accent),var(--accent-2));color:#04121f;box-shadow:0 10px 30px -10px rgba(0,224,198,.6)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 40px -12px rgba(0,224,198,.7)}
.btn-ghost{background:transparent;border-color:rgba(255,255,255,.35);color:#fff}
.btn-ghost:hover{border-color:#fff;background:rgba(255,255,255,.08)}
.btn-lg{padding:14px 30px;font-size:16px}

/* ---- 头部导航 ---- */
.site-header{position:sticky;top:0;z-index:50;backdrop-filter:saturate(160%) blur(14px);background:rgba(10,16,32,.72);border-bottom:1px solid rgba(255,255,255,.08);transition:.3s}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700}
.brand-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#04121f}
.brand-mark svg{width:20px;height:20px}
.brand-text{display:flex;flex-direction:column;line-height:1.1;font-size:18px}
.brand-text i{font-style:normal;font-size:11px;font-weight:500;letter-spacing:1px;color:var(--accent)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.nav-links{display:flex;gap:30px;margin-left:auto;margin-right:26px}
.nav-links a{color:rgba(255,255,255,.82);font-size:15px;font-weight:500;position:relative;padding:6px 0}
.nav-links a:hover,.nav-links a.active{color:#fff}
.nav-links a.active::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--accent);border-radius:2px}
.nav-cta{margin-left:0}
.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:#fff;border-radius:2px;transition:.3s}

/* ---- Hero ---- */
.hero{position:relative;overflow:hidden;background:radial-gradient(120% 120% at 50% 0%,#10204a 0%,#0A1020 55%,#070b16 100%);color:#fff;padding:96px 0 110px}
.hero-bg{position:absolute;inset:0;z-index:0}
.grid-overlay{position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);background-size:46px 46px;mask-image:radial-gradient(80% 60% at 50% 40%,#000 30%,transparent 80%)}
.glow{position:absolute;border-radius:50%;filter:blur(80px);opacity:.55}
.glow-1{width:520px;height:520px;background:var(--accent);top:-160px;left:-120px}
.glow-2{width:480px;height:480px;background:var(--accent-2);bottom:-200px;right:-120px;opacity:.4}
.hero-inner{position:relative;z-index:1}
.hero-slides{position:relative;min-height:300px}
.hero-slide{position:absolute;inset:0;opacity:0;transform:translateY(18px);transition:.6s;pointer-events:none;max-width:880px}
.hero-slide.is-active{opacity:1;transform:none;pointer-events:auto;position:relative}
.hero-eyebrow{display:inline-block;font-size:13px;letter-spacing:2px;color:var(--accent);border:1px solid rgba(0,224,198,.4);padding:5px 14px;border-radius:999px;margin-bottom:20px;background:rgba(0,224,198,.07)}
.hero-title{font-size:clamp(34px,5vw,60px);line-height:1.12;font-weight:800;letter-spacing:.5px;background:linear-gradient(120deg,#fff 30%,var(--accent) 130%);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{margin:22px 0 32px;font-size:clamp(16px,2vw,20px);color:rgba(255,255,255,.82);max-width:680px}
.hero-dots{display:flex;gap:10px;margin-top:34px}
.hero-dot{width:30px;height:6px;border-radius:6px;background:rgba(255,255,255,.22);border:0;cursor:pointer;transition:.3s}
.hero-dot.is-active{background:var(--accent);width:46px}

/* ---- 数据指标条 ---- */
.stats-band{background:var(--ink);color:#fff;padding:40px 0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
.stat-value{font-size:clamp(28px,3.5vw,42px);font-weight:800;background:linear-gradient(120deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.stat-label{color:rgba(255,255,255,.7);font-size:14px;margin-top:4px}

/* ---- 通用区块 ---- */
.section{padding:90px 0}
.section-dark{position:relative;background:linear-gradient(180deg,#0A1020,#0b1530);color:#fff;overflow:hidden}
.tech-bg{position:absolute;inset:0;background-image:radial-gradient(circle at 20% 20%,rgba(0,224,198,.12),transparent 40%),radial-gradient(circle at 80% 60%,rgba(59,130,246,.14),transparent 45%)}
.section-head{max-width:720px;margin:0 auto 52px;text-align:center}
.section-head.light .section-title,.section-head.light .section-desc{color:#fff}
.section-kicker{display:inline-block;font-size:12px;letter-spacing:3px;font-weight:700;color:var(--accent);margin-bottom:12px}
.section-title{font-size:clamp(26px,3.4vw,40px);font-weight:800;letter-spacing:.5px}
.section-desc{margin-top:14px;color:var(--text-soft);font-size:17px}
.section-dark .section-desc{color:rgba(255,255,255,.72)}

/* ---- 产品卡片 ---- */
.product-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.product-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:32px;position:relative;overflow:hidden;transition:.3s;box-shadow:var(--shadow)}
.product-card::before{content:"";position:absolute;inset:0;border-radius:var(--radius);padding:1px;background:linear-gradient(135deg,var(--accent),transparent 45%);-webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:.3s}
.product-card:hover{transform:translateY(-6px);box-shadow:0 26px 60px -24px rgba(15,23,42,.35)}
.product-card:hover::before{opacity:1}
.product-icon{width:56px;height:56px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,rgba(0,224,198,.16),rgba(59,130,246,.16));color:var(--accent-2);margin-bottom:18px}
.product-icon svg{width:28px;height:28px}
.product-name{font-size:21px;font-weight:700;display:flex;flex-direction:column;gap:2px}
.product-name i{font-style:normal;font-size:12px;letter-spacing:1px;color:var(--text-mute);font-weight:500}
.product-tag{color:var(--accent-2);font-weight:600;margin:8px 0 12px;font-size:15px}
.product-desc{color:var(--text-soft);font-size:15px;margin-bottom:18px}
.product-feats{list-style:none;display:grid;gap:10px;margin-bottom:20px}
.product-feats.cols-2{grid-template-columns:1fr 1fr}
.product-feats li{display:flex;align-items:flex-start;gap:9px;font-size:14.5px;color:var(--text)}
.product-feats svg{width:18px;height:18px;color:var(--accent);flex:none;margin-top:3px}
.product-link{display:inline-flex;align-items:center;gap:6px;color:var(--accent-2);font-weight:600;font-size:14.5px}
.product-link svg{width:16px;height:16px;transition:.25s}
.product-link:hover svg{transform:translateX(4px)}

/* ---- 技术能力 ---- */
.tech-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;position:relative;z-index:1}
.tech-card{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.1);border-radius:var(--radius);padding:28px;backdrop-filter:blur(6px);transition:.3s}
.tech-card:hover{border-color:rgba(0,224,198,.5);transform:translateY(-5px)}
.tech-icon{width:50px;height:50px;border-radius:12px;display:grid;place-items:center;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#04121f;margin-bottom:16px}
.tech-icon svg{width:26px;height:26px}
.tech-card h3{font-size:18px;margin-bottom:8px}
.tech-card p{color:rgba(255,255,255,.7);font-size:14.5px}

/* ---- 客户案例 ---- */
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.case-card{background:var(--bg-soft);border:1px solid var(--border);border-radius:var(--radius);padding:28px;transition:.3s}
.case-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.case-metric{font-size:26px;font-weight:800;background:linear-gradient(120deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent;margin-bottom:14px}
.case-company{font-size:18px;font-weight:700}
.case-industry{display:inline-block;font-size:12px;color:var(--accent-2);background:rgba(59,130,246,.1);padding:3px 10px;border-radius:999px;margin:8px 0 12px}
.case-desc{color:var(--text-soft);font-size:14.5px}

/* ---- CTA 条 ---- */
.cta-band{background:linear-gradient(120deg,var(--ink),var(--ink-2));color:#fff;padding:64px 0}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap}
.cta-text h2{font-size:clamp(22px,3vw,32px);font-weight:800}
.cta-text p{color:rgba(255,255,255,.75);margin-top:8px}
.cta-actions{display:flex;gap:14px;flex-wrap:wrap}

/* ---- 页头（内页） ---- */
.page-hero{background:radial-gradient(120% 120% at 50% 0%,#10204a,#0A1020 60%,#070b16);color:#fff;padding:80px 0 70px;text-align:center}
.page-hero .section-kicker{color:var(--accent)}
.page-title{font-size:clamp(30px,4.5vw,48px);font-weight:800;margin-top:8px}
.page-lead{color:rgba(255,255,255,.78);margin-top:14px;font-size:18px}

/* ---- 产品详情 ---- */
.product-detail{display:grid;grid-template-columns:120px 1fr;gap:30px;align-items:start;padding:8px 0}
.product-detail-icon{width:90px;height:90px;border-radius:20px;display:grid;place-items:center;background:linear-gradient(135deg,rgba(0,224,198,.16),rgba(59,130,246,.16));color:var(--accent-2)}
.product-detail-icon svg{width:44px;height:44px}
.product-detail-name{font-size:clamp(22px,3vw,30px);font-weight:800}
.product-detail-tag{color:var(--accent-2);font-weight:600;margin:6px 0 14px}
.product-detail-desc{color:var(--text-soft);font-size:16px;max-width:760px}
.detail-divider{height:1px;background:var(--border);margin:40px 0}

/* ---- 关于 ---- */
.about-story{display:grid;grid-template-columns:1.2fr 1fr;gap:48px;align-items:start}
.block-title{font-size:24px;font-weight:800;margin-bottom:16px;position:relative;padding-left:14px}
.block-title::before{content:"";position:absolute;left:0;top:4px;bottom:4px;width:4px;border-radius:4px;background:linear-gradient(var(--accent),var(--accent-2))}
.about-story-text p{color:var(--text-soft);font-size:16px}
.about-values{display:grid;gap:16px}
.value-card{background:var(--bg-soft);border:1px solid var(--border);border-radius:var(--radius-sm);padding:20px}
.value-card h3{font-size:18px;margin-bottom:6px;color:var(--accent-2)}
.value-card p{color:var(--text-soft);font-size:14.5px}

/* ---- 时间线 ---- */
.timeline{position:relative;z-index:1;display:grid;gap:0;margin-top:10px}
.timeline-item{display:grid;grid-template-columns:90px 30px 1fr;align-items:center;gap:14px;padding:14px 0}
.timeline-year{font-weight:800;color:var(--accent);font-size:18px;text-align:right}
.timeline-dot{width:14px;height:14px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 5px rgba(0,224,198,.18);justify-self:center}
.timeline-item:not(:last-child) .timeline-dot{position:relative}
.timeline-text{color:rgba(255,255,255,.85);font-size:15.5px}

/* ---- 联系 ---- */
.contact-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:48px;align-items:start}
.contact-list{list-style:none;display:grid;gap:22px;margin-top:10px}
.contact-list li{display:flex;gap:16px;align-items:flex-start}
.c-ico{width:44px;height:44px;flex:none;border-radius:12px;display:grid;place-items:center;background:linear-gradient(135deg,rgba(0,224,198,.16),rgba(59,130,246,.16));color:var(--accent-2)}
.c-ico svg{width:22px;height:22px}
.contact-list b{display:block;font-size:13px;color:var(--text-mute);margin-bottom:2px}
.contact-list a,.contact-list span{font-size:16px;color:var(--text)}
.form-notice{background:var(--bg-soft);border:1px solid var(--border);border-radius:var(--radius-sm);padding:16px 18px;color:var(--text-soft);font-size:14.5px;margin-bottom:20px}
.contact-form{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field{display:flex;flex-direction:column;gap:6px}
.field.full{grid-column:1/-1}
.field label{font-size:13px;font-weight:600;color:var(--text-soft)}
.field input,.field textarea{font-family:inherit;font-size:15px;padding:12px 14px;border:1px solid var(--border);border-radius:var(--radius-sm);background:#fff;color:var(--text);transition:.2s}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(0,224,198,.15)}
.field textarea{resize:vertical}
.form-msg{grid-column:1/-1;font-size:14px;color:var(--accent-2);min-height:20px}

/* ---- 页脚 ---- */
.site-footer{background:var(--ink);color:rgba(255,255,255,.8);padding:60px 0 26px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.4fr;gap:36px}
.brand-light{margin-bottom:16px}
.footer-intro{font-size:14px;color:rgba(255,255,255,.6);max-width:340px;margin-bottom:16px}
.footer-social{display:flex;gap:12px}
.footer-social a{font-size:13px;color:rgba(255,255,255,.7);border:1px solid rgba(255,255,255,.18);padding:6px 12px;border-radius:999px;transition:.25s}
.footer-social a:hover{border-color:var(--accent);color:var(--accent)}
.footer-col h4{color:#fff;font-size:15px;margin-bottom:16px}
.footer-col ul{list-style:none;display:grid;gap:10px}
.footer-col a,.footer-contact li{font-size:14px;color:rgba(255,255,255,.65)}
.footer-col a:hover{color:var(--accent)}
.footer-contact li{display:flex;align-items:center;gap:10px}
.footer-contact svg{width:18px;height:18px;color:var(--accent);flex:none}
.footer-bottom{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin-top:44px;padding-top:22px;border-top:1px solid rgba(255,255,255,.1);font-size:13px;color:rgba(255,255,255,.5)}
.icp:hover{color:var(--accent)}
.domain{margin-left:auto}

/* ---- 响应式 ---- */
@media(max-width:980px){
  .tech-grid{grid-template-columns:repeat(2,1fr)}
  .case-grid{grid-template-columns:1fr}
  .about-story{grid-template-columns:1fr;gap:30px}
  .contact-grid{grid-template-columns:1fr;gap:30px}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:760px){
  .nav-links,.nav-cta{display:none}
  .nav-toggle{display:flex}
  .nav-links.open{display:flex;position:absolute;top:68px;left:0;right:0;flex-direction:column;gap:0;background:rgba(10,16,32,.97);padding:10px 22px 18px;border-bottom:1px solid rgba(255,255,255,.1)}
  .nav-links.open a{padding:12px 0;border-bottom:1px solid rgba(255,255,255,.06)}
  .product-grid{grid-template-columns:1fr}
  .product-feats.cols-2{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:28px}
  .tech-grid{grid-template-columns:1fr}
  .product-detail{grid-template-columns:1fr;gap:16px}
  .product-detail-icon{width:64px;height:64px}
  .contact-form{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .cta-inner{flex-direction:column;align-items:flex-start}
  .section{padding:64px 0}
}