/* ============ 基础变量 ============ */
:root{
  --blue:#0028AF;
  --blue-2:#0a3a9e;
  --blue-deep:#0a1f5c;
  --blue-light:#7D96D7;
  --green:#30D070;
  --green-dark:#30B060;
  --green-soft:#EAF3DE;
  --ink:#16203a;
  --gray:#5b6478;
  --gray-2:#8a93a6;
  --line:#e6e9f0;
  --bg-soft:#f5f7fb;
  --radius:14px;
  --maxw:1160px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  color:var(--ink);
  background:#fff;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ============ 导航 ============ */
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(160%) blur(10px);
  border-bottom:1px solid var(--line);
  transition:box-shadow .2s
}
.nav.scrolled{box-shadow:0 2px 16px rgba(0,0,0,.08)}
.nav-inner{max-width:var(--maxw);margin:0 auto;padding:12px 24px;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:10px}
.brand-logo{height:30px;width:auto}
.brand-name{font-weight:800;font-size:18px;color:var(--blue);letter-spacing:1px}
.nav-links{display:flex;align-items:center;gap:28px}
.nav-links a{font-size:15px;color:var(--ink);font-weight:500;transition:color .2s}
.nav-links a:hover{color:var(--blue)}
.nav-cta{background:var(--green);color:#fff!important;padding:8px 18px;border-radius:30px;font-weight:700}
.nav-cta:hover{background:var(--green-dark)}

/* ============ Hero ============ */
.hero{position:relative;overflow:hidden;color:#fff;background:linear-gradient(135deg,var(--blue) 0%,var(--blue-2) 55%,#0d2f8a 100%)}
.hero-bg{position:absolute;inset:0;background:
  radial-gradient(700px 380px at 82% 18%,rgba(48,208,112,.22),transparent 60%),
  radial-gradient(560px 360px at 12% 92%,rgba(125,150,215,.20),transparent 60%);}
.hero-inner{position:relative;max-width:var(--maxw);margin:0 auto;padding:96px 24px 110px}
.hero-tag{font-size:13px;letter-spacing:3px;color:#bcd0ff;font-weight:600;margin-bottom:18px}
.hero h1{font-size:54px;line-height:1.18;font-weight:800;letter-spacing:1px}
.hero h1 .hl{color:var(--green)}
.hero-sub{margin-top:22px;font-size:19px;color:#dbe5ff;line-height:1.8}
.hero-actions{margin-top:38px;display:flex;gap:16px;flex-wrap:wrap}
.btn{display:inline-block;padding:14px 30px;border-radius:30px;font-size:16px;font-weight:700;transition:transform .15s,background .2s,box-shadow .2s}
.btn-green{background:var(--green);color:#fff;box-shadow:0 10px 24px rgba(48,208,112,.35)}
.btn-green:hover{background:var(--green-dark);transform:translateY(-2px)}
.btn-ghost{border:1.5px solid rgba(255,255,255,.6);color:#fff}
.btn-ghost:hover{border-color:#fff;background:rgba(255,255,255,.1)}

/* ============ Hero 大赛主打变体 ============ */
.hero-contest{background:linear-gradient(135deg,var(--blue) 0%,var(--blue-2) 50%,#0d2f8a 100%)}
.hero-contest h1{font-size:62px}
.hero-slogan{margin-top:18px;display:inline-block;font-size:20px;font-weight:700;letter-spacing:2px;color:#fff;background:rgba(48,208,112,.18);border:1px solid rgba(48,208,112,.5);padding:8px 20px;border-radius:30px}
.hero-contest .hero-sub strong{color:var(--green)}

/* ============ 通用区块 ============ */
.block{padding:84px 0}
.block:nth-of-type(even){background:var(--bg-soft)}
.about,.courses,.engines,.loop{padding:84px 0}
.sec-head{margin-bottom:40px}
.sec-no{font-size:13px;letter-spacing:2.5px;color:var(--green-dark);font-weight:700}
.sec-head h2{font-size:34px;font-weight:800;margin-top:8px;color:var(--blue)}
.sec-desc{margin-top:10px;color:var(--gray);font-size:16px}
.sec-head.light .sec-no{color:var(--green)}
.sec-head.light h2{color:#fff}
.sec-head.light .sec-desc{color:#c5d2ee}

/* ============ 关于 ============ */
.about{background:#fff}
.lead{font-size:21px;font-weight:600;line-height:1.7;color:var(--ink);max-width:880px}
.lead strong{color:var(--blue)}
.body{margin-top:16px;font-size:16px;color:var(--gray);max-width:880px}
.philo{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin:46px 0 54px}
.philo-card{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:24px 20px;border-top:3px solid var(--green)}
.philo-card h3{font-size:18px;color:var(--blue);margin-bottom:10px}
.philo-card p{font-size:14px;color:var(--gray);line-height:1.6}
.clients{border-top:1px solid var(--line);padding-top:34px}
.clients-label{font-size:13px;letter-spacing:2px;color:var(--gray-2);font-weight:700;margin-bottom:18px}
.clients-wall{display:flex;flex-wrap:wrap;gap:10px}
.clients-wall span{font-size:14px;color:#46506a;background:var(--bg-soft);border:1px solid var(--line);border-radius:8px;padding:7px 14px;font-weight:500}

/* ============ 课程体系 ============ */
.courses{background:var(--bg-soft)}
.layer{margin-bottom:46px}
.layer-head{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;margin-bottom:20px;padding-left:14px;border-left:5px solid var(--blue)}
.layer-1{border-color:var(--blue)}
.layer-2{border-color:var(--green)}
.layer-3{border-color:var(--blue-deep)}
.layer-tag{font-size:20px;font-weight:800;color:var(--blue)}
.layer-2 .layer-tag{color:var(--green-dark)}
.layer-3 .layer-tag{color:var(--blue-deep)}
.layer-sub{font-size:14px;color:var(--gray)}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px 22px 24px;display:flex;flex-direction:column;transition:transform .18s,box-shadow .18s,border-color .18s}
.card:hover{transform:translateY(-4px);box-shadow:0 14px 34px rgba(20,40,120,.10);border-color:var(--blue-light)}
.card-top{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:12px;flex-wrap:wrap}
.price{font-size:22px;font-weight:800;color:var(--blue)}
.layer-2 .price{color:var(--green-dark)}
.layer-3 .price{color:var(--blue-deep)}
.price small{font-size:13px;font-weight:600;color:var(--gray-2)}
.badge{font-size:12px;color:var(--gray);background:var(--bg-soft);border:1px solid var(--line);border-radius:20px;padding:4px 10px;white-space:nowrap}
.card h3{font-size:18px;font-weight:700;color:var(--ink);margin-bottom:10px;line-height:1.4}
.card-desc{font-size:14px;color:var(--gray);line-height:1.65;margin-bottom:12px}
.card ul{list-style:none;margin-top:auto}
.card ul li{font-size:13.5px;color:#566;line-height:1.6;padding-left:16px;position:relative;margin-bottom:7px}
.card ul li::before{content:"";position:absolute;left:0;top:9px;width:6px;height:6px;border-radius:50%;background:var(--green)}

/* ============ 行业引擎 ============ */
.engines{background:#fff}
.engines-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.engine{border:1px solid var(--line);border-radius:var(--radius);padding:30px;display:flex;flex-direction:column;gap:12px;background:linear-gradient(160deg,#fff,#f3f7ff)}
.engine-ico{width:46px;height:46px;border-radius:12px;background:var(--blue);color:#fff;font-size:20px;font-weight:800;display:flex;align-items:center;justify-content:center}
.engine h3{font-size:20px;color:var(--blue);font-weight:700}
.engine p{font-size:15px;color:var(--gray);line-height:1.7}
.engine-meta{font-size:13px;color:var(--green-dark);font-weight:600;margin-top:auto}

/* ============ 交付闭环 ============ */
.loop{background:linear-gradient(135deg,var(--blue-deep),var(--blue-2));color:#fff}
.loop-flow{display:flex;align-items:stretch;gap:0;margin-top:10px}
.loop-step{flex:1;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.14);border-radius:var(--radius);padding:24px 18px;display:flex;flex-direction:column}
.loop-no{font-size:26px;font-weight:800;color:var(--green)}
.loop-step h3{font-size:20px;margin:6px 0 8px}
.loop-step p{font-size:14px;color:#cdd8f2;line-height:1.6;flex:1}
.loop-prod{margin-top:12px;font-size:12.5px;color:#9fb4e6;background:rgba(255,255,255,.08);border-radius:8px;padding:8px 10px;line-height:1.5}
.loop-arrow{display:flex;align-items:center;color:var(--green);font-size:24px;font-weight:800;padding:0 6px}
.loop-note{text-align:center;margin-top:26px;font-size:14px;color:#aebfe6;letter-spacing:.5px}

/* ============ 页脚 ============ */
.footer{background:var(--blue-deep);color:#fff;padding:70px 0 0}
.footer-inner{max-width:var(--maxw);margin:0 auto;padding:0 24px;display:grid;grid-template-columns:1.2fr 1fr;gap:40px;align-items:start}
.footer-cta h2{font-size:28px;font-weight:800;line-height:1.4;margin-bottom:14px}
.footer-cta p{color:#bccbee;font-size:16px;margin-bottom:22px}
.footer-info{text-align:right}
.footer-logo{height:34px;margin-left:auto;margin-bottom:14px}
.footer-tag{font-size:14px;color:#aebfe6;margin-bottom:14px}
.footer-contact{list-style:none;font-size:14px;color:#cdd8f2;line-height:2}
.footer-contact .ph{color:var(--green);font-weight:600}
.footer-bottom{max-width:var(--maxw);margin:54px auto 0;padding:20px 24px;border-top:1px solid rgba(255,255,255,.12);display:flex;justify-content:space-between;font-size:13px;color:#8ea2d6}

/* ============ 卡点 ============ */
.pain-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.pain-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px;border-top:3px solid var(--green);transition:transform .18s,box-shadow .18s}
.pain-card:hover{transform:translateY(-4px);box-shadow:0 14px 34px rgba(20,40,120,.10)}
.pain-no{font-size:30px;font-weight:800;color:var(--blue-light);line-height:1}
.pain-card h3{font-size:18px;color:var(--blue);margin:12px 0 8px}
.pain-card p{font-size:14px;color:var(--gray);line-height:1.6}

/* ============ 八大体系 ============ */
.sys-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.sys-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px 20px;position:relative;transition:transform .18s,box-shadow .18s,border-color .18s}
.sys-card:hover{transform:translateY(-4px);box-shadow:0 14px 34px rgba(20,40,120,.10);border-color:var(--blue-light)}
.sys-no{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:10px;background:var(--blue);color:#fff;font-weight:800;font-size:15px;margin-bottom:12px}
.sys-card h3{font-size:17px;color:var(--ink);margin-bottom:8px}
.sys-card p{font-size:13.5px;color:var(--gray);line-height:1.6}

/* ============ 多赛道 ============ */
.tracks-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.track-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;display:flex;flex-direction:column;gap:14px;background:linear-gradient(160deg,#fff,#f3f7ff)}
.track-ico{width:54px;height:54px;border-radius:14px;background:var(--green);color:#fff;font-size:16px;font-weight:800;display:flex;align-items:center;justify-content:center}
.track-card h3{font-size:21px;color:var(--blue);font-weight:800}
.track-card p{font-size:15px;color:var(--gray);line-height:1.7}

/* ============ 四阶段推进 ============ */
.gates-flow{display:flex;align-items:stretch;gap:0}
.gate{flex:1;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 18px;text-align:center;display:flex;flex-direction:column;align-items:center}
.gate-no{font-size:30px;font-weight:800;color:var(--green);line-height:1}
.gate h3{font-size:18px;color:var(--blue);margin:10px 0 6px}
.gate p{font-size:13.5px;color:var(--gray);line-height:1.55}
.gate-arrow{display:flex;align-items:center;color:var(--green);font-size:26px;font-weight:800;padding:0 10px}

/* ============ 三线十模块 ============ */
.train-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:20px}
.train-col{border:1px solid var(--line);border-radius:var(--radius);padding:24px;background:#fff}
.train-col.train-top{border-top:3px solid var(--blue)}
.train-col.train-bottom{border-top:3px solid var(--green)}
.train-col.train-side{border-top:3px solid var(--blue-light)}
.train-head{font-size:16px;font-weight:800;color:var(--blue);margin-bottom:14px}
.train-col ul{list-style:none}
.train-col ul li{font-size:14.5px;color:var(--gray);line-height:2;padding-left:16px;position:relative}
.train-col ul li::before{content:"";position:absolute;left:0;top:13px;width:6px;height:6px;border-radius:50%;background:var(--green)}
.train-col ul li b{color:var(--ink)}

/* ============ 交付标准 ============ */
.std-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.std-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 22px;text-align:center;transition:transform .18s,box-shadow .18s}
.std-card:hover{transform:translateY(-4px);box-shadow:0 14px 34px rgba(20,40,120,.10)}
.std-num{font-size:46px;font-weight:800;color:var(--blue);line-height:1}
.std-num span{font-size:22px;color:var(--green-dark)}
.std-label{margin-top:10px;font-size:15px;color:var(--gray);font-weight:600}

/* ============ 标杆实践 ============ */
.case-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.case-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px 22px;display:flex;flex-direction:column;transition:transform .18s,box-shadow .18s}
.case-card:hover{transform:translateY(-4px);box-shadow:0 14px 34px rgba(20,40,120,.10)}
.case-name{font-size:16px;font-weight:700;color:var(--blue);margin-bottom:14px;min-height:44px}
.case-data{font-size:15px;color:var(--ink);margin-bottom:10px}
.case-data .big{font-size:38px;font-weight:800;color:var(--green);margin-right:6px}
.case-card p{font-size:13.5px;color:var(--gray);line-height:1.6}
.case-card p strong{color:var(--blue)}

/* ============ 启动路径 CTA ============ */
.launch{background:linear-gradient(135deg,var(--green),var(--green-dark));color:#fff;padding:64px 0}
.launch-inner{display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap}
.launch-text h2{font-size:32px;font-weight:800;line-height:1.4;margin-bottom:10px}
.launch-text p{font-size:16px;color:rgba(255,255,255,.92)}
.btn-white{background:#fff;color:var(--green-dark);box-shadow:0 10px 24px rgba(0,0,0,.12)}
.btn-white:hover{transform:translateY(-2px);background:#f0fff5}

/* ============ 响应式 ============ */
@media (max-width:980px){
  .philo{grid-template-columns:repeat(2,1fr)}
  .cards{grid-template-columns:repeat(2,1fr)}
  .pain-grid,.sys-grid,.case-grid{grid-template-columns:repeat(2,1fr)}
  .tracks-grid,.std-grid,.train-grid{grid-template-columns:1fr}
  .engines-grid{grid-template-columns:1fr}
  .gates-flow{flex-wrap:wrap;gap:14px}
  .gate{flex:1 1 45%}
  .gate-arrow{display:none}
  .footer-inner{grid-template-columns:1fr}
  .footer-info{text-align:left}
  .footer-logo{margin-left:0}
  .loop-flow{flex-wrap:wrap;gap:14px}
  .loop-step{flex:1 1 45%}
  .loop-arrow{display:none}
}
@media (max-width:680px){
  .nav-links{gap:14px}
  .nav-links a:not(.nav-cta){display:none}
  .hero h1,.hero-contest h1{font-size:36px}
  .hero-sub{font-size:16px}
  .hero-slogan{font-size:15px}
  .sec-head h2{font-size:26px}
  .lead{font-size:18px}
  .philo,.cards,.pain-grid,.sys-grid,.case-grid{grid-template-columns:1fr}
  .std-num{font-size:38px}
  .loop-step{flex:1 1 100%}
  .footer-bottom{flex-direction:column;gap:6px}
}