:root {
    --ink: #0e1726;
    --ink-2: #1b2a41;
    --paper: #f7f9fc;
    --line: #e4e9f2;
    --muted: #5c6b82;
    --accent: #2f6bff;
    --accent-2: #23c1a5;
    --radius: 14px;
  }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body {
    font-family: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
    color: var(--ink);
    background: var(--paper);
    line-height: 1.65;
  }
  a { color: inherit; text-decoration: none; }

  header {
    position: sticky; top: 0; z-index: 50;
    background: rgba(247, 249, 252, .88);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--line);
  }
  .nav {
    max-width: 1120px; margin: 0 auto; padding: 14px 24px;
    display: flex; align-items: center; justify-content: space-between;
  }
  .logo { font-size: 21px; font-weight: 800; letter-spacing: .02em; }
  .logo span { color: var(--accent); }
  .nav-links { display: flex; gap: 26px; font-size: 14.5px; color: var(--muted); }
  .nav-links a:hover { color: var(--ink); }
  .nav-cta {
    background: var(--ink); color: #fff !important; padding: 9px 18px;
    border-radius: 999px; font-size: 14px; font-weight: 600;
  }

  .hero {
    background:
      radial-gradient(900px 420px at 82% -10%, rgba(47, 107, 255, .16), transparent 60%),
      radial-gradient(700px 380px at 8% 110%, rgba(35, 193, 165, .12), transparent 60%),
      linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 100%);
    color: #eef2f8;
  }
  .hero-inner {
    max-width: 1120px; margin: 0 auto; padding: 92px 24px 100px;
  }
  .eyebrow {
    display: inline-flex; align-items: center; gap: 8px;
    font-size: 13px; letter-spacing: .08em; text-transform: uppercase;
    color: #9db4dd; border: 1px solid rgba(157, 180, 221, .35);
    padding: 6px 14px; border-radius: 999px; margin-bottom: 26px;
  }
  .eyebrow::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--accent-2); }
  .hero h1 {
    font-size: clamp(34px, 5.2vw, 58px); line-height: 1.18; font-weight: 800;
    letter-spacing: .01em; max-width: 21em;
  }
  .hero h1 em { font-style: normal; color: #7ea8ff; }
  .hero p.sub {
    margin-top: 22px; font-size: clamp(16px, 2vw, 19px); color: #b9c7dd; max-width: 46em;
  }
  .hero-cta { margin-top: 36px; display: flex; gap: 14px; flex-wrap: wrap; }
  .btn {
    padding: 13px 26px; border-radius: 999px; font-size: 15.5px; font-weight: 700;
    display: inline-flex; align-items: center; gap: 9px; transition: transform .15s ease, box-shadow .15s ease;
  }
  .btn:hover { transform: translateY(-2px); }
  .btn-primary { background: var(--accent); color: #fff; box-shadow: 0 12px 30px rgba(47, 107, 255, .35); }
  .btn-ghost { border: 1px solid rgba(190, 205, 230, .4); color: #dbe6f6; }
  .hero-strip {
    margin-top: 58px; display: flex; gap: 38px; flex-wrap: wrap;
    color: #8fa6c8; font-size: 13.5px; letter-spacing: .04em;
  }
  .hero-strip b { color: #eef2f8; font-size: 22px; display: block; letter-spacing: 0; }

  section { max-width: 1120px; margin: 0 auto; padding: 84px 24px; }
  .section-head { max-width: 640px; margin-bottom: 44px; }
  .kicker { color: var(--accent); font-weight: 700; font-size: 13.5px; letter-spacing: .12em; text-transform: uppercase; }
  h2 { font-size: clamp(25px, 3.2vw, 36px); line-height: 1.25; margin-top: 10px; font-weight: 800; }
  .section-head p { margin-top: 14px; color: var(--muted); font-size: 16.5px; }

  .cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(290px, 1fr)); gap: 22px; }
  .card {
    background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
    padding: 30px 28px; display: flex; flex-direction: column; gap: 12px;
    transition: box-shadow .2s ease, transform .2s ease;
  }
  .card:hover { box-shadow: 0 18px 44px rgba(14, 23, 38, .09); transform: translateY(-3px); }
  .card .icon {
    width: 46px; height: 46px; border-radius: 12px; display: flex; align-items: center;
    justify-content: center; font-size: 21px; margin-bottom: 6px;
  }
  .card h3 { font-size: 19.5px; }
  .card p { color: var(--muted); font-size: 15px; flex: 1; }
  .card .link { color: var(--accent); font-weight: 700; font-size: 14.5px; }
  .card .link::after { content: " →"; }

  .feature-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 20px; margin-top: 12px; }
  .feature { padding: 22px 22px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); }
  .feature h4 { font-size: 16px; margin-bottom: 8px; }
  .feature p { color: var(--muted); font-size: 14.5px; }
  .feature .dot { display: inline-block; width: 9px; height: 9px; border-radius: 50%; background: var(--accent-2); margin-right: 9px; }

  .band { background: var(--ink); color: #e6edf8; border-radius: 22px; padding: 56px 48px; margin: 0 24px; }
  .band-wrap { max-width: 1072px; margin: 0 auto; }
  .band h2 { color: #fff; }
  .band p { color: #aebdd4; margin-top: 12px; max-width: 44em; }
  .band .btn-primary { margin-top: 28px; }

  footer { border-top: 1px solid var(--line); margin-top: 40px; }
  .foot {
    max-width: 1120px; margin: 0 auto; padding: 34px 24px 46px;
    display: flex; justify-content: space-between; gap: 18px; flex-wrap: wrap;
    color: var(--muted); font-size: 14px;
  }
  .foot a:hover { color: var(--ink); }

  @media (max-width: 640px) {
    .nav-links { display: none; }
    .hero-inner { padding: 64px 20px 70px; }
    .band { padding: 40px 26px; margin: 0 16px; }
  }