:root{
  --bg:#0b1220;
  --bg2:#0f1a33;
  --card:#111c38;
  --text:#e9eefc;
  --muted:#a9b5d6;
  --line:rgba(255,255,255,.10);
  --brand:#5dd6ff;
  --brand2:#7c5cff;
  --shadow: 0 14px 40px rgba(0,0,0,.35);
  --radius:16px;
  --max: 1120px;
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: #070b14; /* 只保留底色 */
  color:var(--text);
  line-height:1.6;
  position: relative;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;

  background:
    radial-gradient(1200px 800px at 20% 10%, rgba(93,214,255,.18), transparent 60%),
    radial-gradient(900px 600px at 90% 20%, rgba(124,92,255,.20), transparent 60%),
    linear-gradient(180deg, var(--bg), #070b14 70%);
}

a{ color:inherit; text-decoration:none; }
a:hover{ opacity:.92; }

.container{
  width:min(var(--max), calc(100% - 40px));
  margin:0 auto;
}

.sr-only{
  position:absolute !important;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;clip:rect(0,0,0,0);
  white-space:nowrap;border:0;
}

.skip-link{
  position:absolute; left:-9999px; top:10px;
  background:#fff; color:#000;
  padding:10px 12px; border-radius:10px;
}
.skip-link:focus{ left:10px; z-index:9999; }

/* Header */
.header{
  position:sticky; top:0; z-index:50;
  backdrop-filter: blur(10px);
  background: rgba(7,11,20,.65);
  border-bottom:1px solid var(--line);
}
.header-inner{
  display:flex; align-items:center; justify-content:space-between;
  gap:16px; padding:14px 0;
}

.brand{ display:flex; align-items:center; gap:12px; }
.brand-mark{
  width:56px; height:56px; border-radius:14px;
  display:grid; place-items:center;
  background: linear-gradient(135deg, rgba(93,214,255,.28), rgba(124,92,255,.28));
  border:1px solid var(--line);
  box-shadow: var(--shadow);
  font-weight:800;
}
.brand-mark img{
  width:100%;
  height:100%;
  object-fit:contain;
  display:block;
  border-radius:12px;
}
.brand-name{ font-weight:800; letter-spacing:.2px; }
.brand-sub{ color:var(--muted); font-size:12px; margin-top:2px; }

.nav{ display:flex; align-items:center; gap:12px; }
.nav-menu{
  display:flex; align-items:center; gap:18px;
}
.nav-menu a{
  color:var(--muted);
  padding:8px 10px;
  border-radius:10px;
}
.nav-menu a:hover{
  background: rgba(255,255,255,.06);
  color:var(--text);
}

.lang-switch{
  display:flex; gap:8px; align-items:center;
  padding-left:8px;
  border-left:1px solid var(--line);
}
.lang-btn{
  background: rgba(255,255,255,.06);
  color: var(--muted);
  border:1px solid var(--line);
  padding:7px 10px;
  border-radius:10px;
  cursor:pointer;
}
.lang-btn.active{
  color:#07101f;
  background: linear-gradient(135deg, rgba(93,214,255,.95), rgba(124,92,255,.95));
  border-color: transparent;
}

.nav-toggle{
  display:none;
  width:42px; height:42px;
  border-radius:12px;
  border:1px solid var(--line);
  background: rgba(255,255,255,.06);
  cursor:pointer;
}
.hamburger{
  display:block; width:18px; height:2px; background: var(--text);
  position:relative; margin:0 auto;
}
.hamburger::before,.hamburger::after{
  content:""; position:absolute; left:0; right:0;
  height:2px; background: var(--text);
}
.hamburger::before{ top:-6px; }
.hamburger::after{ top:6px; }

/* Hero */
.hero{ position:relative; padding:44px 0 24px; }
.hero-inner{
  display:grid;
  grid-template-columns: 1.25fr .95fr;
  gap:22px;
  align-items:stretch;
}
.hero-bg{
  position:absolute; inset:0;
  pointer-events:none;
  background:
    radial-gradient(800px 420px at 35% 40%, rgba(93,214,255,.16), transparent 65%),
    radial-gradient(700px 380px at 85% 30%, rgba(124,92,255,.16), transparent 60%);
  opacity:.9;
}

.badge{
  display:inline-flex; align-items:center;
  padding:8px 12px;
  border-radius:999px;
  border:1px solid var(--line);
  background: rgba(255,255,255,.06);
  color: var(--muted);
  margin:0 0 14px;
}
.hero-title{
  font-size: clamp(28px, 3.2vw, 44px);
  line-height:1.15;
  margin:0 0 10px;
  letter-spacing:.2px;
}
.hero-desc{
  margin:0 0 18px;
  color: var(--muted);
  max-width: 58ch;
}
.hero-cta{ display:flex; gap:12px; margin: 18px 0 18px; }

.btn{
  display:inline-flex; align-items:center; justify-content:center;
  gap:8px;
  padding:12px 16px;
  border-radius:12px;
  border:1px solid var(--line);
  cursor:pointer;
  font-weight:700;
}
.btn.primary{
  background: linear-gradient(135deg, rgba(93,214,255,.95), rgba(124,92,255,.95));
  color:#07101f;
  border-color:transparent;
}
.btn.ghost{
  background: rgba(255,255,255,.06);
  color: var(--text);
}
.btn:hover{ transform: translateY(-1px); }

.hero-metrics{
  display:flex; gap:14px; flex-wrap:wrap;
  margin-top: 8px;
}
.metric{
  padding:10px 12px;
  border:1px solid var(--line);
  background: rgba(255,255,255,.05);
  border-radius: 14px;
  min-width: 140px;
}
.metric-num{ font-weight:900; font-size:18px; }
.metric-label{ color: var(--muted); font-size:12px; margin-top:2px; }

/* Cards / sections */
.section{ padding: 42px 0; }
.section.alt{
  background: rgba(255,255,255,.02); /* 轻微叠加，不会“重开渐变” */
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.section-head{ margin-bottom: 18px; }
.section-head h2{
  margin:0 0 8px;
  font-size: 26px;
}
.section-head p{ margin:0; color: var(--muted); max-width: 80ch; }

.card{
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.panel{
  padding:18px;
  border-radius: var(--radius);
  border:1px solid var(--line);
  background: rgba(255,255,255,.04);
}

.grid{ display:grid; gap:16px; }
.grid.two{ grid-template-columns: 1fr 1fr; }
.grid.three{ grid-template-columns: 1fr 1fr 1fr; }

.dl{ margin:0; }
.dl > div{ display:grid; grid-template-columns: 120px 1fr; gap:10px; padding:10px 0; border-bottom:1px solid rgba(255,255,255,.06); }
.dl > div:last-child{ border-bottom:none; }
.dl dt{ color: var(--muted); }
.dl dd{ margin:0; }

.bullets{ margin:10px 0 0; padding-left: 18px; color: var(--text); }
.bullets li{ margin: 8px 0; color: var(--muted); }

.hero-card .card{
  padding:18px;
}
.checklist{ margin:10px 0 0; padding:0; list-style:none; }
.checklist li{
  padding-left: 26px;
  position:relative;
  margin:10px 0;
  color: var(--muted);
}
.checklist li::before{
  content:"✓";
  position:absolute; left:0; top:0;
  color: var(--brand);
  font-weight:900;
}

.trust{
  margin-top: 14px;
  display:grid; gap:10px;
}
.trust-item{
  border:1px solid rgba(255,255,255,.08);
  background: rgba(0,0,0,.18);
  border-radius: 14px;
  padding:12px;
}
.trust-k{ font-weight:800; }
.trust-v{ color: var(--muted); margin-top:2px; font-size: 13px; }

.cards{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap:16px;
}
.svc.card, .case.card{ padding:18px; }
.svc h3, .case h3{ margin:0 0 8px; }
.svc p, .case p{ margin:0; color: var(--muted); }
.tags{
  margin:12px 0 0;
  padding:0;
  list-style:none;
  display:flex; flex-wrap:wrap; gap:8px;
}
.tags li{
  padding:6px 10px;
  border-radius: 999px;
  border:1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.04);
  color: var(--muted);
  font-size: 12px;
}

/* Form */
.form{ padding:18px; display:grid; gap:12px; }
.form label{ display:grid; gap:6px; }
.form span{ color: var(--muted); font-size: 13px; }
input, textarea{
  width:100%;
  padding:12px 12px;
  border-radius: 12px;
  border:1px solid rgba(255,255,255,.14);
  background: rgba(0,0,0,.22);
  color: var(--text);
  outline:none;
}
input:focus, textarea:focus{
  border-color: rgba(93,214,255,.55);
  box-shadow: 0 0 0 4px rgba(93,214,255,.12);
}

.form-hint{
  margin:0;
  min-height: 1.2em;
  color: var(--muted);
}
.form-hint.ok{ color: rgba(93,214,255,.95); }
.form-hint.err{ color: #ffb1b1; }

.contact-side{ padding:18px; }
.contact-kv{ display:grid; gap:12px; margin-top: 10px; }
.kv .k{ color: var(--muted); font-size: 13px; }
.kv .v{ margin-top:4px; }
.muted{ color: var(--muted); font-size: 12px; margin-left: 6px; }

.notice{
  margin-top: 14px;
  padding:12px;
  border-radius: 14px;
  border:1px dashed rgba(255,255,255,.18);
  background: rgba(255,255,255,.04);
}

/* Footer */
.footer{
  border-top:1px solid var(--line);
  background: rgba(0,0,0,.25);
  padding:18px 0;
}
.footer-inner{
  display:flex; align-items:center; justify-content:space-between;
  gap:12px;
}
.foot-sub{ color: var(--muted); font-size: 13px; margin-top:4px; }
.foot-right{ display:flex; gap:12px; color: var(--muted); }
.foot-right a{ padding:6px 8px; border-radius:10px; }
.foot-right a:hover{ background: rgba(255,255,255,.06); color: var(--text); }

/* Responsive */
@media (max-width: 980px){
  .hero-inner{ grid-template-columns: 1fr; }
  .cards{ grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px){
  .grid.two{ grid-template-columns: 1fr; }
  .grid.three{ grid-template-columns: 1fr; }
  .cards{ grid-template-columns: 1fr; }
  .nav-toggle{ display:inline-flex; align-items:center; justify-content:center; }
  .nav-menu{
    position:absolute;
    right:20px; top:68px;
    flex-direction:column;
    align-items:stretch;
    gap:8px;
    padding:12px;
    width: min(320px, calc(100% - 40px));
    border-radius: 16px;
    border: 1px solid var(--line);
    background: rgba(7,11,20,.95);
    box-shadow: var(--shadow);
    display:none;
  }
  .nav-menu.open{ display:flex; }
  .lang-switch{
    padding-left:0; border-left:none;
    border-top: 1px solid rgba(255,255,255,.08);
    padding-top:10px;
    justify-content:flex-start;
  }
}