/* 星光科技官网 · 企业级样式 */
:root{
  --brand:#1a56db; --brand-d:#1240a8; --brand-l:#3b82f6;
  --ink:#0f172a; --ink2:#334155; --muted:#64748b; --line:#e2e8f0;
  --bg:#ffffff; --bg2:#f8fafc; --dark:#0b1220;
  --radius:14px; --shadow:0 10px 30px rgba(15,23,42,.08);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}

/* 导航 */
.nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);transition:.3s}
.nav.scrolled{box-shadow:0 4px 20px rgba(15,23,42,.06)}
.nav .wrap{display:flex;align-items:center;height:70px;gap:32px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px}
.logo .mark{width:38px;height:38px;border-radius:10px;background:linear-gradient(135deg,var(--brand),var(--brand-l));color:#fff;display:flex;align-items:center;justify-content:center;font-size:15px;letter-spacing:.5px}
.logo-img{height:38px;width:auto}
.links{display:flex;gap:28px;margin-left:auto;font-size:15px;font-weight:500;color:var(--ink2)}
.links a{position:relative;padding:6px 0;transition:.2s}
.links a:hover,.links a.on{color:var(--brand)}
.links a.on::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--brand);border-radius:2px}
.cta{background:var(--brand);color:#fff;padding:10px 22px;border-radius:10px;font-weight:600;font-size:14px;transition:.2s}
.cta:hover{background:var(--brand-d);transform:translateY(-1px)}
.burger{display:none;font-size:24px;cursor:pointer;color:var(--ink)}
.mnav{display:none}

/* 首屏 */
.hero{position:relative;overflow:hidden;background:linear-gradient(180deg,#f8fafc,#fff)}
.hero-bg{position:absolute;inset:0;background:
  radial-gradient(600px 300px at 80% 0%,rgba(59,130,246,.12),transparent),
  radial-gradient(500px 300px at 10% 100%,rgba(26,86,219,.08),transparent);pointer-events:none}
.hero-inner{position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center;padding:80px 24px 90px}
.badge{display:inline-block;background:#eff6ff;color:var(--brand);font-size:13px;font-weight:600;padding:7px 16px;border-radius:100px;margin-bottom:22px}
.hero h1{font-size:46px;line-height:1.25;font-weight:900;letter-spacing:-.5px;margin-bottom:20px}
.grad{background:linear-gradient(120deg,var(--brand),var(--brand-l));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero-text p{font-size:17px;color:var(--muted);max-width:560px;margin-bottom:30px}
.hero-btns{display:flex;gap:14px;margin-bottom:44px}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:14px 30px;border-radius:11px;font-weight:700;font-size:15px;transition:.2s;cursor:pointer;border:0}
.btn.primary{background:var(--brand);color:#fff;box-shadow:0 8px 22px rgba(26,86,219,.28)}
.btn.primary:hover{background:var(--brand-d);transform:translateY(-2px)}
.btn.ghost{background:#fff;color:var(--ink);border:1.5px solid var(--line)}
.btn.ghost:hover{border-color:var(--brand);color:var(--brand)}
.stats{display:flex;gap:44px}
.stats div{display:flex;flex-direction:column}
.stats b{font-size:28px;font-weight:900;color:var(--ink)}
.stats span{font-size:13px;color:var(--muted)}

/* 首屏视觉卡 */
.hero-visual{position:relative}
.glass-card{background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);overflow:hidden}
.gc-head{display:flex;align-items:center;gap:7px;padding:16px 20px;border-bottom:1px solid var(--line);background:var(--bg2)}
.gc-head .dot{width:11px;height:11px;border-radius:50%;background:#e2e8f0}
.gc-head .dot:nth-child(1){background:#f87171}.gc-head .dot:nth-child(2){background:#fbbf24}.gc-head .dot:nth-child(3){background:#34d399}
.gc-title{margin-left:12px;font-size:13px;color:var(--muted);font-weight:600}
.gc-body{padding:22px}
.gc-row{display:flex;gap:14px;align-items:flex-start;padding:14px 0;border-bottom:1px dashed var(--line)}
.gc-row:last-child{border-bottom:0}
.gc-ic{font-size:22px;width:44px;height:44px;background:var(--bg2);border-radius:11px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.gc-row b{font-size:15px}
.gc-row p{font-size:13px;color:var(--muted)}

/* 通用区块 */
.section{padding:88px 0}
.section.alt{background:var(--bg2)}
.sec-head{text-align:center;max-width:720px;margin:0 auto 54px}
.sec-tag{display:inline-block;color:var(--brand);font-size:13px;font-weight:700;letter-spacing:2px;text-transform:uppercase;margin-bottom:14px}
.sec-head h2{font-size:34px;font-weight:900;letter-spacing:-.5px;margin-bottom:16px}
.sec-head p{color:var(--muted);font-size:16px}
.sec-head.light h2,.sec-head.light p{color:#fff}
.sec-head.light p{color:#cbd5e1}

/* 能力 */
.features{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.feat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 24px;transition:.25s}
.feat:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#dbeafe}
.feat .ico{font-size:30px;margin-bottom:16px}
.feat h3{font-size:18px;margin-bottom:10px}
.feat p{color:var(--muted);font-size:14px}

/* 产品 */
.pgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.prod{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px 26px;transition:.25s}
.prod:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#dbeafe}
.prod-ico{font-size:34px;margin-bottom:18px}
.prod h3{font-size:19px;margin-bottom:12px}
.prod p{color:var(--muted);font-size:14px;margin-bottom:16px}
.prod .more{color:var(--brand);font-weight:600;font-size:14px}

/* 品牌实力（深色） */
.brand{background:linear-gradient(135deg,#0b1220,#132043);color:#fff}
.brand-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-bottom:50px}
.bs{text-align:center;padding:30px 16px;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);border-radius:var(--radius)}
.bs b{display:block;font-size:36px;font-weight:900;background:linear-gradient(120deg,#60a5fa,#93c5fd);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:8px}
.bs span{color:#cbd5e1;font-size:14px}
.brand-ads{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.brand-ad{border-radius:var(--radius);overflow:hidden;position:relative;background:rgba(255,255,255,.05)}
.brand-ad img{width:100%;height:200px;object-fit:cover}
.ba-cap{padding:12px 16px;font-size:14px;color:#e2e8f0}

/* 视频 */
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.video-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.25s}
.video-card:hover{box-shadow:var(--shadow)}
.vc-media{position:relative;cursor:pointer;background:#0b1220;aspect-ratio:16/9;display:flex;align-items:center;justify-content:center}
.vc-media img{width:100%;height:100%;object-fit:cover}
.vc-ph{font-size:40px;color:#475569}
.vc-play{position:absolute;width:60px;height:60px;border-radius:50%;background:rgba(26,86,219,.92);color:#fff;display:flex;align-items:center;justify-content:center;font-size:20px;padding-left:4px;box-shadow:0 8px 24px rgba(26,86,219,.4)}
.vc-video{width:100%;background:#000}
.vc-info{padding:18px 20px}
.vc-info h4{font-size:16px;margin-bottom:6px}
.vc-info p{color:var(--muted);font-size:13px}

/* 广告横幅 */
.ad-banner{padding:40px 0;background:var(--bg2)}
.ad-banner .wrap{display:flex;gap:20px;flex-wrap:wrap}
.ad-item{flex:1;min-width:280px;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.ad-item img{width:100%;height:180px;object-fit:cover}

/* 联系 */
.contact-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.contact-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 24px;text-align:center}
.cc-ic{font-size:30px;margin-bottom:14px}
.contact-card h4{font-size:16px;margin-bottom:8px}
.contact-card p{color:var(--muted);font-size:14px;word-break:break-all}

/* 页脚 */
.foot{background:var(--dark);color:#94a3b8;padding:60px 0 30px}
.foot-main{display:flex;gap:60px;justify-content:space-between;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.1);flex-wrap:wrap}
.foot-info{display:flex;gap:32px;flex-wrap:wrap;padding:20px 0;border-bottom:1px solid rgba(255,255,255,.1);color:#cbd5e1;font-size:14px}
.foot-brand{display:flex;gap:12px;align-items:flex-start}
.foot-brand .mark{width:40px;height:40px;border-radius:10px;background:linear-gradient(135deg,var(--brand),var(--brand-l));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800}
.foot-brand b{color:#fff;font-size:17px}
.foot-brand p{font-size:13px;margin-top:4px}
.foot-cols{display:flex;gap:60px}
.foot-cols h4{color:#fff;font-size:15px;margin-bottom:16px}
.foot-cols a{display:block;font-size:14px;margin-bottom:10px;transition:.2s}
.foot-cols a:hover{color:#fff}
.foot-bottom{display:flex;justify-content:space-between;padding-top:24px;font-size:13px;flex-wrap:wrap;gap:10px}

/* 响应式 */
@media(max-width:1024px){
  .hero-inner{grid-template-columns:1fr;gap:40px}
  .hero-visual{display:none}
  .features,.pgrid,.contact-grid{grid-template-columns:repeat(2,1fr)}
  .brand-stats{grid-template-columns:repeat(2,1fr)}
  .brand-ads,.video-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .links,.cta{display:none}
  .burger{display:block;margin-left:auto}
  .mnav{display:none;flex-direction:column;padding:12px 24px 20px;background:#fff;border-bottom:1px solid var(--line)}
  .mnav.open{display:flex}
  .mnav a{padding:12px 0;border-bottom:1px solid var(--line);font-weight:500}
  .hero h1{font-size:32px}
  .hero-inner{padding:50px 24px 60px}
  .stats{gap:24px;flex-wrap:wrap}
  .section{padding:60px 0}
  .sec-head h2{font-size:26px}
  .features,.pgrid,.contact-grid,.brand-stats,.brand-ads,.video-grid{grid-template-columns:1fr}
  .foot-main{flex-direction:column;gap:32px}
  .foot-cols{gap:36px}
}