:root {
  --bg: #071626;
  --bg2: #0b2744;
  --bg3: #0e3556;
  --accent: #22d3ee;
  --accent2: #38bdf8;
  --blue: #0ea5e9;
  --text: #e8f2fa;
  --muted: #9db8cc;
  --card: rgba(16, 45, 74, 0.55);
  --border: rgba(56, 189, 248, 0.22);
  --radius: 16px;
  --max: 1180px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

.container { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* Nav */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(7, 22, 38, 0.75);
  border-bottom: 1px solid rgba(56, 189, 248, 0.12);
}
.nav-inner {
  max-width: var(--max); margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; gap: 28px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; }
.brand-logo { width: 34px; height: 34px; object-fit: contain; }
.nav-links { display: flex; gap: 24px; margin-left: auto; }
.nav-links a { color: var(--muted); font-size: 15px; transition: color .2s; }
.nav-links a:hover { color: var(--text); }
.nav-cta {
  padding: 8px 18px; border-radius: 999px; font-size: 14px; font-weight: 600;
  border: 1px solid var(--accent); color: var(--accent); transition: .2s;
}
.nav-cta:hover { background: var(--accent); color: #04121f; }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text); margin: 5px 0; }

/* Hero */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center; justify-content: center; text-align: center;
  padding: 120px 24px 80px; overflow: hidden;
  background: radial-gradient(1200px 600px at 70% 20%, #0e3556 0%, #0b2744 45%, #071626 100%);
}
.hero-grid {
  position: absolute; inset: 0; opacity: 0.18;
  background-image: radial-gradient(rgba(56,189,248,0.35) 1px, transparent 1px);
  background-size: 28px 28px;
  -webkit-mask-image: radial-gradient(circle at center, black, transparent 78%);
  mask-image: radial-gradient(circle at center, black, transparent 78%);
}
.hero-glow { position: absolute; border-radius: 50%; filter: blur(80px); opacity: 0.5; }
.hero-glow-1 { width: 420px; height: 420px; background: rgba(34,211,238,0.22); top: -80px; right: -80px; }
.hero-glow-2 { width: 380px; height: 380px; background: rgba(14,165,233,0.2); bottom: -120px; left: -100px; }
.hero-inner { position: relative; max-width: 1040px; }
.hero-eyebrow { color: var(--accent2); font-size: 14px; letter-spacing: 2px; margin-bottom: 22px; }
.hero-title {
  font-size: clamp(34px, 5.5vw, 56px); line-height: 1.15; font-weight: 800; letter-spacing: 1px;
  background: linear-gradient(90deg, #ffffff, #bdeeff);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-sub { font-size: clamp(16px, 2.2vw, 20px); color: var(--muted); margin: 20px auto 24px; max-width: 680px; }
.hero-trust {
  display: inline-flex; align-items: center; gap: 10px; flex-wrap: wrap; justify-content: center;
  padding: 11px 22px; border-radius: 999px; margin-bottom: 38px;
  font-size: 15px; color: var(--text);
  background: rgba(34,211,238,0.10);
  border: 1px solid rgba(34,211,238,0.45);
}
.trust-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 12px var(--accent); flex: none; }
.hero-cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; margin-bottom: 38px; text-align: left; }
.hero-card {
  position: relative; display: block; padding: 30px 28px; border-radius: var(--radius);
  background: var(--card); border: 1px solid var(--border); border-top: 3px solid var(--accent);
  transition: transform .25s, border-color .25s, background .25s;
}
.hero-card:hover { border-color: var(--accent); transform: translateY(-4px); background: rgba(16, 45, 74, 0.78); }
.hero-card-num { color: var(--accent); font-size: 14px; font-weight: 700; letter-spacing: 1px; }
.hero-card h2 { font-size: 24px; margin: 10px 0 12px; color: #fff; }
.hero-card p { color: var(--muted); font-size: 15px; line-height: 1.65; }
.hero-card-link { display: inline-block; margin-top: 16px; color: var(--accent); font-size: 14px; font-weight: 600; }
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.btn { padding: 13px 28px; border-radius: 999px; font-size: 16px; font-weight: 600; transition: .2s; }
.btn-primary { background: var(--accent); color: #04121f; box-shadow: 0 8px 28px rgba(34,211,238,0.35); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 34px rgba(34,211,238,0.5); }
.btn-ghost { border: 1px solid var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); }
.hero-scroll { position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%); color: var(--muted); font-size: 13px; }

/* Sections */
.section { padding: 100px 0; }
.section-alt { background: linear-gradient(180deg, rgba(11,39,68,0.35), transparent); }
.section-head { display: flex; align-items: flex-end; gap: 16px; margin-bottom: 34px; }
.section-num { font-size: 34px; font-weight: 800; color: var(--accent); line-height: 1; }
.section-head h2 { font-size: clamp(28px, 4vw, 40px); font-weight: 800; letter-spacing: 1px; }
.section-en { color: var(--accent2); font-size: 13px; letter-spacing: 2px; margin-top: 2px; }
.lead { font-size: 18px; color: var(--muted); max-width: 900px; }

/* Stats */
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 40px; }
.stat {
  padding: 28px 24px; border-radius: var(--radius); background: var(--card);
  border: 1px solid var(--border); border-top: 2px solid var(--accent);
}
.stat-num { font-size: 22px; font-weight: 700; color: var(--accent); margin-bottom: 8px; }
.stat-desc { color: var(--muted); font-size: 15px; }

/* Cards */
.cards-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.service-card { padding: 34px 30px; border-radius: var(--radius); background: var(--card); border: 1px solid var(--border); }
.service-card h3 { font-size: 24px; margin-bottom: 18px; color: #fff; }
.service-card ul li { color: var(--muted); padding: 7px 0 7px 22px; position: relative; font-size: 16px; }
.service-card ul li::before { content: ""; position: absolute; left: 2px; top: 16px; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }
.spec { margin-top: 24px; border-radius: var(--radius); background: var(--card); border: 1px solid var(--border); overflow: hidden; }
.spec-item { padding: 18px 24px; border-bottom: 1px solid var(--border); color: var(--muted); font-size: 15px; }
.spec-item:last-child { border-bottom: 0; }
.spec-item strong { color: var(--text); margin-right: 10px; }

.cards-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.adv-card { padding: 26px 24px; border-radius: var(--radius); background: var(--card); border: 1px solid var(--border); border-top: 2px solid var(--accent); }
.adv-card h3 { font-size: 20px; margin-bottom: 10px; color: #fff; }
.adv-card p { color: var(--muted); font-size: 15px; }

.tech-band, .network-band, .compliance-band, .real-band {
  border-radius: var(--radius); padding: 26px 28px; margin-top: 30px;
  background: var(--card); border: 1px solid var(--accent); font-size: 17px;
}
.tech-band strong, .network-band strong, .compliance-band strong, .real-band strong { color: var(--accent); }
.network-band { margin-top: 30px; }
.compliance-band { border-left: 4px solid var(--accent); }
.real-band { border-left: 4px solid var(--accent); }

.subtitle { font-size: 20px; margin: 40px 0 22px; color: #fff; }
.flow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
.flow li { text-align: center; color: var(--muted); font-size: 15px; }
.flow-num {
  display: block; width: 54px; height: 54px; line-height: 54px; margin: 0 auto 12px;
  border-radius: 50%; background: var(--accent); color: #04121f; font-weight: 700; font-size: 20px;
  box-shadow: 0 0 22px rgba(34,211,238,0.4);
}

/* Contact */
.contact-box { text-align: center; border-radius: 22px; padding: 64px 30px; background: linear-gradient(135deg, #0b2744, #0e3556); border: 1px solid var(--border); }
.contact-box h2 { font-size: clamp(30px, 5vw, 44px); margin-bottom: 14px; }
.contact-sub { color: var(--muted); font-size: 17px; max-width: 620px; margin: 0 auto 36px; }
.contact-steps { display: flex; justify-content: center; gap: 30px; flex-wrap: wrap; margin-bottom: 38px; }
.step { color: var(--muted); font-size: 15px; }
.step span { display: block; color: var(--accent); font-size: 22px; font-weight: 700; margin-bottom: 6px; }
.contact-info { margin-bottom: 30px; color: var(--muted); font-size: 15px; line-height: 2; }
.contact-info .company { color: #fff; font-size: 19px; font-weight: 700; }

/* Footer */
.footer { border-top: 1px solid var(--border); padding: 30px 0; text-align: center; color: var(--muted); font-size: 14px; }
.footer-muted { margin-top: 6px; font-size: 13px; opacity: 0.7; }

/* Reveal animation */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* Responsive */
@media (max-width: 820px) {
  .nav-links, .nav-cta { display: none; }
  .nav-toggle { display: block; margin-left: auto; }
  .nav-links.open { display: flex; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0; background: rgba(7,22,38,0.98); padding: 18px 24px; gap: 16px; }
  .stats, .cards-2, .cards-3 { grid-template-columns: 1fr; }
  .hero-cards { grid-template-columns: 1fr; }
  .flow { grid-template-columns: repeat(2, 1fr); gap: 22px; }
  .section { padding: 70px 0; }
}