/* ============================================================
   北京深海星空科技咨询有限公司 — 深海星空主题
   DeepSea Starry Sky · tech-professional theme
   ============================================================ */
:root{
  --navy-900:#050d1c;
  --navy-800:#071326;
  --navy-700:#0a1c33;
  --navy-600:#0e2542;
  --line:rgba(125,180,255,.14);
  --cyan:#38bdf8;
  --cyan-strong:#0ea5e9;
  --gold:#fbbf24;
  --text:#e8f0fc;
  --muted:#9db4d6;
  --card:rgba(255,255,255,.045);
  --card-hover:rgba(56,189,248,.09);
  --radius:16px;
  --maxw:1200px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Segoe UI",system-ui,sans-serif;
  background:var(--navy-800);
  color:var(--text);
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}

/* ---------- 星空背景 ---------- */
.starfield{position:fixed;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(1.5px 1.5px at 12% 22%,rgba(255,255,255,.85) 50%,transparent 51%),
    radial-gradient(1px 1px at 28% 68%,rgba(255,255,255,.6) 50%,transparent 51%),
    radial-gradient(1.5px 1.5px at 44% 12%,rgba(160,220,255,.9) 50%,transparent 51%),
    radial-gradient(1px 1px at 58% 40%,rgba(255,255,255,.55) 50%,transparent 51%),
    radial-gradient(2px 2px at 70% 78%,rgba(190,230,255,.85) 50%,transparent 51%),
    radial-gradient(1px 1px at 82% 18%,rgba(255,255,255,.6) 50%,transparent 51%),
    radial-gradient(1.5px 1.5px at 90% 55%,rgba(160,220,255,.8) 50%,transparent 51%),
    radial-gradient(1px 1px at 8% 84%,rgba(255,255,255,.5) 50%,transparent 51%),
    radial-gradient(1px 1px at 35% 90%,rgba(255,255,255,.45) 50%,transparent 51%),
    radial-gradient(1.5px 1.5px at 65% 6%,rgba(255,255,255,.7) 50%,transparent 51%),
    radial-gradient(1200px 700px at 85% -10%,rgba(14,165,233,.16),transparent 60%),
    radial-gradient(1000px 600px at -10% 30%,rgba(56,189,248,.10),transparent 60%),
    linear-gradient(180deg,#04101f 0%,#071326 45%,#0a1c33 100%);
}
.page{position:relative;z-index:1}

/* ---------- 顶部条 & 导航 ---------- */
.topbar{border-bottom:1px solid var(--line);background:rgba(5,13,28,.65);backdrop-filter:blur(8px);font-size:13px;color:var(--muted)}
.topbar .wrap{max-width:var(--maxw);margin:0 auto;padding:7px 24px;display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
.topbar a{color:var(--cyan);white-space:nowrap}
.topbar .lang b{color:var(--text);font-weight:600}
header.site{position:sticky;top:0;z-index:50;background:rgba(6,16,32,.82);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav{max-width:var(--maxw);margin:0 auto;padding:0 24px;display:flex;align-items:center;gap:20px;height:72px}
.brand{display:flex;align-items:center;gap:12px;margin-right:auto}
.brand .logo{width:44px;height:44px;border-radius:12px;flex:0 0 auto;
  background:radial-gradient(80% 80% at 30% 25%,#123f66 0%,#071c33 60%,#04101f 100%);
  border:1px solid rgba(56,189,248,.45);display:grid;place-items:center;box-shadow:0 0 18px rgba(56,189,248,.28) inset}
.brand .logo svg{width:26px;height:26px}
.brand b{font-size:17px;letter-spacing:.5px;display:block;line-height:1.3}
.brand span{font-size:11.5px;color:var(--muted);display:block;letter-spacing:.4px}
nav.menu{display:flex;align-items:center;gap:4px}
nav.menu>a{padding:9px 14px;border-radius:10px;font-size:15px;color:var(--text);white-space:nowrap;position:relative}
nav.menu>a:hover,nav.menu>a.active{background:var(--card-hover);color:#fff}
nav.menu>a.active::after{content:"";position:absolute;left:14px;right:14px;bottom:3px;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--cyan),transparent)}
.nav-cta{margin-left:8px;padding:9px 18px;border-radius:10px;font-size:14.5px;
  background:linear-gradient(135deg,#0ea5e9,#2563eb);color:#fff;font-weight:600;box-shadow:0 6px 20px rgba(14,165,233,.35);white-space:nowrap}
.nav-cta:hover{filter:brightness(1.1)}
.burger{display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:10px;background:transparent;cursor:pointer;color:var(--text);font-size:20px}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden}
.hero .wrap{max-width:var(--maxw);margin:0 auto;padding:96px 24px 84px;display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center}
.hero h1{font-size:44px;line-height:1.28;letter-spacing:1px}
.hero h1 .grad{background:linear-gradient(92deg,#7dd3fc 0%,#38bdf8 45%,#a78bfa 100%);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .sub{margin-top:20px;color:var(--muted);font-size:17px;max-width:560px}
.hero .tags{margin-top:26px;display:flex;gap:10px;flex-wrap:wrap}
.tag{padding:7px 15px;border-radius:999px;border:1px solid var(--line);background:var(--card);font-size:13.5px;color:#cfe3ff}
.hero .acts{margin-top:34px}
.acts{display:flex;gap:14px;flex-wrap:wrap}
.li-dot{font-size:14.5px;color:#c6d8f2;padding:6px 0 6px 18px;position:relative;list-style:none}
.li-dot::before{content:"";position:absolute;left:2px;top:14px;width:6px;height:6px;border-radius:2px;background:var(--cyan);opacity:.75;transform:rotate(45deg)}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 26px;border-radius:12px;font-size:15.5px;font-weight:600;transition:.2s}
.btn-primary{background:linear-gradient(135deg,#0ea5e9,#2563eb);color:#fff;box-shadow:0 10px 30px rgba(14,165,233,.35)}
.btn-primary:hover{transform:translateY(-2px);filter:brightness(1.08)}
.btn-ghost{border:1px solid rgba(125,180,255,.35);color:#dbeafe;background:rgba(255,255,255,.03)}
.btn-ghost:hover{background:var(--card-hover)}
.hero-art{position:relative;border-radius:20px;overflow:hidden;border:1px solid var(--line);box-shadow:0 30px 80px rgba(2,8,20,.6)}
.hero-art img{width:100%;height:420px;object-fit:cover}
.hero-art .cap{position:absolute;left:0;right:0;bottom:0;padding:14px 18px;font-size:13px;color:#dcebff;background:linear-gradient(transparent,rgba(4,12,24,.85))}
.hero-stats{max-width:var(--maxw);margin:0 auto;padding:0 24px 64px;display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.stat{padding:22px 20px;border-radius:var(--radius);border:1px solid var(--line);background:var(--card);text-align:center}
.stat b{display:block;font-size:30px;color:var(--cyan);font-family:Georgia,serif}
.stat span{font-size:13.5px;color:var(--muted)}

/* ---------- 区块通用 ---------- */
section.block{max-width:var(--maxw);margin:0 auto;padding:72px 24px}
.block-head{text-align:center;max-width:760px;margin:0 auto 46px}
.kicker{display:inline-flex;align-items:center;gap:8px;font-size:13px;letter-spacing:2px;color:var(--cyan);text-transform:uppercase}
.kicker::before,.kicker::after{content:"";width:26px;height:1px;background:linear-gradient(90deg,transparent,var(--cyan));display:inline-block}
.kicker::after{background:linear-gradient(90deg,var(--cyan),transparent)}
.block-head h2{margin-top:12px;font-size:32px;letter-spacing:.5px}
.block-head p{margin-top:12px;color:var(--muted);font-size:15.5px}

/* 卡片 */
.grid{display:grid;gap:20px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{padding:28px 24px;border-radius:var(--radius);border:1px solid var(--line);background:var(--card);transition:.25s}
.card:hover{background:var(--card-hover);transform:translateY(-4px);border-color:rgba(56,189,248,.4)}
.card .ico{width:52px;height:52px;border-radius:14px;display:grid;place-items:center;margin-bottom:16px;
  background:linear-gradient(135deg,rgba(56,189,248,.18),rgba(37,99,235,.16));border:1px solid rgba(56,189,248,.35)}
.card .ico svg{width:26px;height:26px}
.card h3{font-size:18.5px;margin-bottom:10px}
.card p{font-size:14.5px;color:var(--muted)}
.card ul{margin-top:12px}
.card ul li{font-size:14px;color:#c6d8f2;padding:5px 0 5px 18px;position:relative}
.card ul li::before{content:"";position:absolute;left:2px;top:13px;width:6px;height:6px;border-radius:2px;background:var(--cyan);opacity:.75;transform:rotate(45deg)}
.card .more{display:inline-block;margin-top:14px;font-size:14px;color:var(--cyan)}
.card .more:hover{text-decoration:underline}

/* 图片卡 */
.photo-card{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);position:relative}
.photo-card img{width:100%;height:100%;object-fit:cover}
.photo-card .cap{position:absolute;inset:auto 0 0 0;padding:12px 16px;font-size:13px;background:linear-gradient(transparent,rgba(4,12,24,.88));color:#dcebff}

/* 服务条目（咨询页） */
.svc-list{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.svc{display:flex;gap:14px;padding:18px;border-radius:14px;border:1px solid var(--line);background:var(--card)}
.svc:hover{background:var(--card-hover)}
.svc .no{flex:0 0 auto;width:40px;height:40px;border-radius:10px;display:grid;place-items:center;font-weight:700;color:var(--cyan);border:1px solid rgba(56,189,248,.4);background:rgba(56,189,248,.08);font-size:15px}
.svc h4{font-size:16px;margin-bottom:4px}
.svc p{font-size:13.5px;color:var(--muted)}

/* 图表 */
.chart{padding:26px;border-radius:var(--radius);border:1px solid var(--line);background:var(--card)}
.chart h4{font-size:16px;margin-bottom:6px;text-align:center}
.chart .src{font-size:12px;color:var(--muted);text-align:center;margin-top:10px}
.chart svg{width:100%;height:auto;margin-top:12px}

/* 双栏图文 */
.split{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center}
.split .pic{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line)}
.split .pic img{width:100%;height:380px;object-fit:cover}

/* 数字流带 */
.band{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:rgba(8,20,38,.55)}
.band .wrap{max-width:var(--maxw);margin:0 auto;padding:20px 24px;display:flex;gap:28px;flex-wrap:wrap;justify-content:center}
.band span{font-size:14px;color:#c6d8f2;display:inline-flex;align-items:center;gap:8px}
.band span::before{content:"◆";color:var(--cyan);font-size:11px}

/* 联系卡 */
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.cbox{padding:30px;border-radius:var(--radius);border:1px solid var(--line);background:var(--card);display:flex;gap:18px;align-items:flex-start}
.cbox .ico{flex:0 0 auto;width:50px;height:50px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,rgba(56,189,248,.2),rgba(37,99,235,.18));border:1px solid rgba(56,189,248,.4)}
.cbox .ico svg{width:24px;height:24px}
.cbox h4{font-size:17px;margin-bottom:6px}
.cbox p{font-size:15px;color:#d5e4fa}
.cbox small{display:block;color:var(--muted);margin-top:4px;font-size:13px}
.cbox a{color:var(--cyan)}

/* CTA */
.cta{max-width:var(--maxw);margin:0 auto 76px;padding:52px 40px;border-radius:22px;text-align:center;
  background:linear-gradient(135deg,rgba(14,165,233,.16),rgba(37,99,235,.14)),var(--card);border:1px solid rgba(56,189,248,.35)}
.cta h2{font-size:28px;margin-bottom:12px}
.cta p{color:var(--muted);margin-bottom:24px}

/* 面包屑 */
.crumbs{max-width:var(--maxw);margin:0 auto;padding:26px 24px 0;font-size:13.5px;color:var(--muted)}
.crumbs a{color:var(--muted)}
.crumbs a:hover{color:var(--cyan)}

/* 页内导航（英文站 services 锚点） */
.anchor-nav{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-bottom:36px}
.anchor-nav a{padding:9px 18px;border-radius:999px;border:1px solid var(--line);background:var(--card);font-size:14px}
.anchor-nav a:hover{background:var(--card-hover);color:#fff}

/* 页脚 */
footer.site{border-top:1px solid var(--line);background:rgba(4,10,22,.8);margin-top:40px}
footer.site .wrap{max-width:var(--maxw);margin:0 auto;padding:52px 24px 26px;display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px}
footer.site h5{font-size:16px;margin-bottom:14px;color:#fff}
footer.site p,footer.site li{font-size:14px;color:var(--muted);padding:4px 0}
footer.site a:hover{color:var(--cyan)}
.foot-bottom{border-top:1px solid var(--line);text-align:center;padding:18px 24px;font-size:13px;color:#6f86ab}

/* 入场动画：CSS 动画实现，加载后必定结束于可见态（无 JS 依赖） */
html.js .reveal{opacity:0;animation:reveal-rise .8s ease .1s forwards}
@keyframes reveal-rise{
  from{opacity:0;transform:translateY(24px)}
  to{opacity:1;transform:none}
}

/* 响应式 */
@media (max-width:1080px){
  .hero .wrap{grid-template-columns:1fr;padding-top:64px}
  .hero h1{font-size:36px}
  .g4{grid-template-columns:repeat(2,1fr)}
  footer.site .wrap{grid-template-columns:1fr 1fr}
}
@media (max-width:820px){
  .burger{display:block}
  nav.menu{position:absolute;top:72px;left:0;right:0;flex-direction:column;align-items:stretch;background:rgba(5,13,28,.97);border-bottom:1px solid var(--line);padding:12px 20px 20px;display:none}
  nav.menu.open{display:flex}
  nav.menu>a{padding:13px 10px;border-bottom:1px solid var(--line)}
  .nav-cta{margin:12px 0 0;text-align:center}
  .g2,.g3,.g4,.svc-list,.contact-grid,.split{grid-template-columns:1fr}
  .hero-stats{grid-template-columns:repeat(2,1fr)}
  .split .pic img{height:260px}
  .hero .wrap{padding:56px 20px 56px}
  section.block{padding:56px 20px}
  .cta{padding:38px 22px}
}