/* ───────── 导航 ───────── */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  display:flex;align-items:center;justify-content:space-between;
  padding:18px var(--sp-4);
  background:rgba(5,16,31,.62);backdrop-filter:blur(14px);
  border-bottom:1px solid rgba(30,94,200,.18);
  transition:padding .3s ease,background .3s ease;
}
.nav.scrolled{padding:12px var(--sp-4);background:rgba(5,16,31,.9)}
.brand{display:flex;align-items:center;gap:12px;font-weight:700;font-size:18px}
.brand .logo{width:34px;height:34px;flex:none}
.brand small{display:block;font-size:11px;font-weight:400;color:var(--text-weak);letter-spacing:.12em}
.nav-links{display:flex;align-items:center;gap:30px}
.nav-links a{font-size:15px;color:var(--text-mid);transition:color .25s}
.nav-links a:hover{color:var(--accent)}
.nav-cta{margin-left:8px}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;flex-direction:column;gap:5px}
.nav-toggle span{width:24px;height:2px;background:var(--text-strong);display:block}
@media (max-width:900px){
  .nav-links{position:fixed;inset:64px 0 auto 0;flex-direction:column;gap:0;
    background:rgba(5,16,31,.97);padding:10px 0;border-bottom:1px solid var(--border);
    transform:translateY(-120%);transition:transform .35s ease}
  .nav-links.open{transform:none}
  .nav-links a{padding:14px var(--sp-4);width:100%}
  .nav-toggle{display:flex}
}

/* ───────── 按钮 ───────── */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:13px 26px;border-radius:8px;font-size:15px;font-weight:600;
  cursor:pointer;transition:transform .2s ease,box-shadow .2s ease,background .2s;
  border:1px solid transparent;
}
.btn-primary{background:var(--grad-accent);color:#04121f;box-shadow:var(--shadow-glow)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 0 40px rgba(0,229,255,.4)}
.btn-ghost{border-color:rgba(0,229,255,.45);color:var(--accent)}
.btn-ghost:hover{background:rgba(0,229,255,.08);transform:translateY(-2px)}

/* ───────── 卡片 ───────── */
.card{
  background:var(--panel-2);border:1px solid var(--border-soft);
  border-radius:var(--radius);padding:28px 26px;box-shadow:var(--shadow);
  transition:transform .3s ease,border-color .3s ease,box-shadow .3s ease;
  position:relative;overflow:hidden;
}
.card:hover{transform:translateY(-6px);border-color:rgba(0,229,255,.45);box-shadow:0 10px 36px rgba(0,0,0,.45)}
.card .ico{
  width:52px;height:52px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  background:rgba(0,229,255,.10);border:1px solid var(--border-soft);margin-bottom:18px;
}
.card h3{font-size:20px;margin-bottom:10px}
.card p{color:var(--text-mid);font-size:15px}
.card .tag{font-size:12px;color:var(--accent);letter-spacing:.1em;margin-top:14px;display:inline-block}

/* 平台卡（大） */
.platform-card{
  background:linear-gradient(160deg,rgba(14,35,64,.92),rgba(8,22,39,.92));
  border:1px solid var(--border-soft);border-radius:var(--radius-lg);
  padding:34px 30px;position:relative;overflow:hidden;transition:transform .35s,border-color .35s;
}
.platform-card:hover{transform:translateY(-8px);border-color:rgba(0,229,255,.5)}
.platform-card .num{
  font-size:60px;font-weight:800;background:var(--grad-accent);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;opacity:.9;
}
.platform-card h3{font-size:23px;margin:6px 0 14px}
.platform-card p{color:var(--text-mid);font-size:15px;margin-bottom:18px}
.platform-card .link{color:var(--accent);font-size:14px;font-weight:600}

/* ───────── 巨型数字带 ───────── */
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--sp-4)}
@media (max-width:900px){.stats{grid-template-columns:1fr}}
.stat .big{font-size:clamp(54px,7vw,84px);font-weight:800;line-height:1;
  background:var(--grad-accent);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.stat .label{color:var(--text-mid);font-size:15px;margin-top:8px}
.stat .desc{color:var(--text-weak);font-size:13px;margin-top:6px;line-height:1.5}

/* ───────── 需求条 ───────── */
.need{display:flex;gap:18px;align-items:flex-start;padding:20px 0;border-bottom:1px solid rgba(30,94,200,.15)}
.need .idx{font-size:22px;font-weight:800;color:var(--accent);flex:none;width:42px}
.need h4{font-size:18px;margin-bottom:4px}
.need p{color:var(--text-mid);font-size:14px}

/* ───────── 场景矩阵 ───────── */
.matrix{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media (max-width:900px){.matrix{grid-template-columns:1fr}}
.cell{background:var(--panel-2);border:1px solid var(--border-soft);border-radius:var(--radius);
  padding:22px;transition:border-color .3s,transform .3s}
.cell:hover{border-color:rgba(0,229,255,.45);transform:translateY(-4px)}
.cell .domain{font-size:17px;font-weight:700;margin-bottom:8px}
.cell .pill{display:inline-block;font-size:12px;color:var(--accent);
  border:1px solid var(--border-soft);border-radius:20px;padding:3px 12px;margin:4px 4px 0 0}

/* ───────── 合作模式 ───────── */
.mode{background:var(--panel-2);border:1px solid var(--border-soft);border-radius:var(--radius);
  padding:26px;text-align:center;transition:transform .3s,border-color .3s}
.mode:hover{transform:translateY(-6px);border-color:rgba(0,229,255,.45)}
.mode .m-ico{width:46px;height:46px;margin:0 auto 14px;color:var(--accent)}
.mode h4{font-size:18px;margin-bottom:8px}
.mode p{color:var(--text-mid);font-size:14px}

/* ───────── 页脚 ───────── */
.footer{background:rgba(4,12,22,.96);border-top:1px solid var(--border);padding:56px 0 28px;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px}
@media (max-width:900px){.footer-grid{grid-template-columns:1fr 1fr}}
.footer h5{font-size:15px;color:var(--text-strong);margin-bottom:16px}
.footer a{display:block;color:var(--text-mid);font-size:14px;padding:6px 0;transition:color .25s}
.footer a:hover{color:var(--accent)}
.footer .copy{border-top:1px solid var(--border);margin-top:36px;padding-top:20px;
  color:var(--text-weak);font-size:13px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

/* ───────── 内页 Hero / 面包屑 ───────── */
.subhero{position:relative;padding:150px 0 64px;overflow:hidden}
.subhero::after{content:"";position:absolute;right:-60px;top:40px;width:360px;height:360px;border-radius:50%;
  background:radial-gradient(circle,rgba(0,229,255,.12) 0%,transparent 60%);pointer-events:none}
.subhero h1{font-size:clamp(32px,5vw,52px);font-weight:800;margin:12px 0 16px;line-height:1.15}
.subhero p{color:var(--text-mid);max-width:740px;font-size:17px;line-height:1.7}
.breadcrumb{font-size:13px;color:var(--text-weak);margin-bottom:18px}
.breadcrumb a{color:var(--text-mid)}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb span{margin:0 8px;color:var(--border)}

/* 双栏特性块 */
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
@media (max-width:900px){.split{grid-template-columns:1fr;gap:28px}}
.split .visual{aspect-ratio:4/3;border-radius:var(--radius-lg);border:1px solid var(--border-soft);
  background:radial-gradient(circle at 70% 20%,rgba(0,229,255,.12),transparent 55%),var(--panel-2);
  display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}
.split h2{font-size:clamp(26px,3.4vw,38px);margin-bottom:16px}
.split p{color:var(--text-mid);font-size:16px;margin-bottom:14px}
.kv{display:flex;gap:14px;padding:14px 0;border-bottom:1px solid rgba(30,94,200,.15)}
.kv b{color:var(--accent);flex:none;width:96px;font-size:15px}
.kv span{color:var(--text-mid);font-size:15px}

/* 时间轴 */
.timeline{position:relative;padding-left:28px}
.timeline::before{content:"";position:absolute;left:7px;top:6px;bottom:6px;width:2px;background:rgba(0,229,255,.3)}
.tl-item{position:relative;padding:0 0 30px 22px}
.tl-item::before{content:"";position:absolute;left:-28px;top:4px;width:16px;height:16px;border-radius:50%;
  background:var(--bg);border:3px solid var(--accent);box-shadow:0 0 12px rgba(0,229,255,.5)}
.tl-item h4{font-size:18px;margin-bottom:6px}
.tl-item p{color:var(--text-mid);font-size:14px}

/* 列表卡 */
.list-card{background:var(--panel-2);border:1px solid var(--border-soft);border-radius:var(--radius);padding:24px 22px;transition:transform .3s,border-color .3s}
.list-card:hover{transform:translateY(-5px);border-color:rgba(0,229,255,.45)}
.list-card h4{font-size:17px;margin-bottom:8px;color:var(--text-strong)}
.list-card p{color:var(--text-mid);font-size:14px}

/* Hero 通用 */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;overflow:hidden}
.hero-inner{position:relative;z-index:3;max-width:760px}
.hero h1{font-size:clamp(38px,6vw,68px);line-height:1.12;margin:14px 0 22px;font-weight:800}
.hero .lede{font-size:19px;color:var(--text-mid);max-width:620px;margin-bottom:34px;line-height:1.7}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}
.hero-badge{display:inline-flex;align-items:center;gap:10px;padding:8px 16px;border-radius:30px;
  border:1px solid var(--border-soft);background:rgba(14,35,64,.6);font-size:13px;color:var(--text-mid)}
.hero-badge .dot{width:8px;height:8px;border-radius:50%;background:var(--accent);
  box-shadow:0 0 10px var(--accent);animation:pulse 1.8s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.3}}
.scroll-hint{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);z-index:3;
  color:var(--text-weak);font-size:12px;letter-spacing:.2em;text-align:center}
.scroll-hint .mouse{width:22px;height:36px;border:1.5px solid var(--text-weak);border-radius:12px;
  margin:0 auto 8px;position:relative}
.scroll-hint .mouse::after{content:"";position:absolute;top:7px;left:50%;transform:translateX(-50%);
  width:3px;height:7px;border-radius:2px;background:var(--accent);animation:scroll 1.6s infinite}
@keyframes scroll{0%{opacity:0;transform:translate(-50%,0)}40%{opacity:1}80%{opacity:0;transform:translate(-50%,12px)}}