:root {
    --navy: #1a365d;
    --navy-deep: #122a4a;
    --navy-light: #2c5282;
    --gold: #d69e2e;
    --gold-light: #e9c46a;
    --ink: #2d3748;
    --gray: #4a5568;
    --gray-light: #718096;
    --bg: #f7fafc;
    --white: #ffffff;
    --line: #e2e8f0;
    --shadow: 0 10px 30px rgba(26, 54, 93, 0.08);
    --shadow-lg: 0 20px 50px rgba(26, 54, 93, 0.15);
    --radius: 14px;
  }

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

  html { scroll-behavior: smooth; }

  body {
    font-family: "Inter", -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; }
  ul { list-style: none; }

  .container { width: min(1180px, 92%); margin: 0 auto; }

  /* ---------- Header / Nav ---------- */
  header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(26, 54, 93, 0.97);
    backdrop-filter: blur(8px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.12);
  }
  .nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
  }
  .logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--white);
    font-weight: 800;
    font-size: 20px;
    letter-spacing: 0.5px;
  }
  .logo .mark {
    width: 38px; height: 38px;
    border-radius: 9px;
    background: linear-gradient(135deg, var(--gold), var(--gold-light));
    color: var(--navy);
    display: grid; place-items: center;
    font-size: 20px; font-weight: 800;
  }
  .logo small { display: block; font-size: 11px; font-weight: 500; color: var(--gold-light); letter-spacing: 2px; }

  .nav-links { display: flex; align-items: center; gap: 6px; }
  .nav-links a {
    color: #cbd5e0;
    padding: 9px 16px;
    border-radius: 8px;
    font-weight: 500;
    font-size: 15px;
    transition: all 0.25s ease;
    position: relative;
  }
  .nav-links a:hover { color: var(--white); background: rgba(255,255,255,0.06); }
  .nav-links a.active {
    color: var(--navy);
    background: var(--gold);
    font-weight: 600;
  }
  .nav-cta {
    background: var(--gold) !important;
    color: var(--navy) !important;
    font-weight: 700 !important;
  }
  .nav-cta:hover { background: var(--gold-light) !important; }

  .hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none; border: none; cursor: pointer; padding: 8px;
  }
  .hamburger span {
    width: 26px; height: 3px; background: var(--white); border-radius: 3px; transition: 0.3s;
  }

  /* ---------- Sections ---------- */
  .page { display: block; padding: 60px 0 80px; animation: fade 0.4s ease; }
  @keyframes fade { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

  .section-head { text-align: center; max-width: 720px; margin: 0 auto 50px; }
  .section-head .eyebrow {
    color: var(--gold); font-weight: 700; letter-spacing: 3px; font-size: 13px; text-transform: uppercase;
  }
  .section-head h2 { font-size: 34px; color: var(--navy); margin: 12px 0 14px; font-weight: 800; }
  .section-head p { color: var(--gray); font-size: 16px; }

  /* ---------- Hero ---------- */
  .hero {
    background:
      radial-gradient(1200px 500px at 80% -10%, rgba(214,158,46,0.18), transparent),
      linear-gradient(135deg, var(--navy) 0%, var(--navy-deep) 100%);
    color: var(--white);
    padding: 90px 0 100px;
    position: relative;
    overflow: hidden;
  }
  .hero::after {
    content: ""; position: absolute; right: -120px; top: -120px;
    width: 420px; height: 420px; border-radius: 50%;
    background: radial-gradient(circle, rgba(214,158,46,0.22), transparent 70%);
  }
  .hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 50px; align-items: center; position: relative; z-index: 1; }
  .hero h1 { font-size: 46px; line-height: 1.25; font-weight: 800; margin-bottom: 20px; }
  .hero h1 .accent { color: var(--gold-light); }
  .hero p.lead { font-size: 18px; color: #cbd5e0; margin-bottom: 32px; max-width: 520px; }
  .hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }
  .btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 14px 28px; border-radius: 10px; font-weight: 600; font-size: 15px;
    cursor: pointer; border: none; transition: all 0.25s ease;
  }
  .btn-gold { background: var(--gold); color: var(--navy); }
  .btn-gold:hover { background: var(--gold-light); transform: translateY(-2px); box-shadow: 0 10px 25px rgba(214,158,46,0.35); }
  .btn-ghost { background: transparent; color: var(--white); border: 1.5px solid rgba(255,255,255,0.35); }
  .btn-ghost:hover { border-color: var(--gold); color: var(--gold-light); }

  .hero-card {
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 18px; padding: 30px; backdrop-filter: blur(6px);
  }
  .hero-card h3 { color: var(--gold-light); font-size: 17px; margin-bottom: 18px; }
  .hero-card ul li { display: flex; gap: 12px; padding: 10px 0; color: #e2e8f0; font-size: 15px; border-bottom: 1px solid rgba(255,255,255,0.08); }
  .hero-card ul li:last-child { border-bottom: none; }
  .hero-card ul li .ic { color: var(--gold-light); font-weight: 700; }

  /* ---------- Stats ---------- */
  .stats { background: var(--white); border-bottom: 1px solid var(--line); }
  .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; padding: 36px 0; }
  .stat { text-align: center; }
  .stat .num { font-size: 38px; font-weight: 800; color: var(--navy); }
  .stat .num span { color: var(--gold); }
  .stat .label { color: var(--gray-light); font-size: 14px; margin-top: 4px; }

  /* ---------- Cards ---------- */
  .card-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
  .card-grid.three { grid-template-columns: repeat(3, 1fr); }
  .card {
    background: var(--white); border-radius: var(--radius); padding: 30px 26px;
    box-shadow: var(--shadow); border: 1px solid var(--line);
    transition: all 0.3s ease; position: relative; overflow: hidden;
  }
  .card::before {
    content: ""; position: absolute; left: 0; top: 0; height: 4px; width: 100%;
    background: linear-gradient(90deg, var(--navy), var(--gold)); transform: scaleX(0); transform-origin: left; transition: 0.3s;
  }
  .card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
  .card:hover::before { transform: scaleX(1); }
  .card .icon {
    width: 54px; height: 54px; border-radius: 12px; background: rgba(26,54,93,0.07);
    color: var(--navy); display: grid; place-items: center; font-size: 26px; margin-bottom: 18px;
  }
  .card h3 { color: var(--navy); font-size: 19px; margin-bottom: 10px; }
  .card p { color: var(--gray); font-size: 14.5px; }
  .card .more { display: inline-block; margin-top: 14px; color: var(--gold); font-weight: 600; font-size: 14px; }

  /* ---------- Why ---------- */
  .why { background: var(--white); }
  .why-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
  .why-item { display: flex; gap: 16px; padding: 22px; border-radius: 12px; background: var(--bg); }
  .why-item .wi { font-size: 26px; color: var(--gold); flex-shrink: 0; }
  .why-item h4 { color: var(--navy); font-size: 16px; margin-bottom: 4px; }
  .why-item p { color: var(--gray); font-size: 14px; }

  /* ---------- CTA band ---------- */
  .cta-band {
    background: linear-gradient(135deg, var(--navy), var(--navy-deep));
    color: var(--white); border-radius: 18px; padding: 50px; text-align: center;
    position: relative; overflow: hidden;
  }
  .cta-band::before { content:""; position:absolute; left:-60px; bottom:-80px; width:240px; height:240px; border-radius:50%; background: radial-gradient(circle, rgba(214,158,46,0.25), transparent 70%); }
  .cta-band h2 { font-size: 30px; margin-bottom: 12px; position: relative; }
  .cta-band p { color: #cbd5e0; margin-bottom: 26px; position: relative; }

  /* ---------- Service detail ---------- */
  .svc-block { display: grid; grid-template-columns: 80px 1fr; gap: 24px; background: var(--white); border-radius: var(--radius); padding: 32px; margin-bottom: 22px; box-shadow: var(--shadow); border: 1px solid var(--line); }
  .svc-block .svc-ic { width: 70px; height: 70px; border-radius: 14px; background: linear-gradient(135deg, var(--navy), var(--navy-light)); color: var(--gold-light); display: grid; place-items: center; font-size: 32px; }
  .svc-block h3 { color: var(--navy); font-size: 22px; margin-bottom: 6px; }
  .svc-block .desc { color: var(--gray); margin-bottom: 16px; }
  .svc-tags { display: flex; flex-wrap: wrap; gap: 10px; }
  .svc-tags span { background: rgba(26,54,93,0.06); color: var(--navy); padding: 6px 14px; border-radius: 20px; font-size: 13.5px; font-weight: 500; }

  /* ---------- About ---------- */
  .about-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; margin-bottom: 60px; }
  .about-intro .pic { background: linear-gradient(135deg, var(--navy), var(--navy-light)); border-radius: 18px; height: 340px; display: grid; place-items: center; color: var(--gold-light); font-size: 80px; }
  .about-intro h2 { color: var(--navy); font-size: 30px; margin-bottom: 16px; }
  .about-intro p { color: var(--gray); margin-bottom: 14px; }

  .qual-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-bottom: 60px; }
  .qual { text-align: center; background: var(--white); border-radius: 12px; padding: 26px 16px; box-shadow: var(--shadow); border: 1px solid var(--line); }
  .qual .qi { font-size: 34px; margin-bottom: 10px; }
  .qual h4 { color: var(--navy); font-size: 16px; margin-bottom: 6px; }
  .qual p { color: var(--gray-light); font-size: 13px; }

  .team-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
  .member { background: var(--white); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); border: 1px solid var(--line); text-align: center; }
  .member .avatar { height: 150px; background: linear-gradient(135deg, var(--navy), var(--navy-light)); display: grid; place-items: center; color: var(--gold-light); font-size: 46px; }
  .member .body { padding: 18px; }
  .member h4 { color: var(--navy); font-size: 17px; }
  .member .role { color: var(--gold); font-size: 13.5px; font-weight: 600; margin: 4px 0 8px; }
  .member p { color: var(--gray-light); font-size: 13px; }

  /* ---------- Cases ---------- */
  .filter-bar { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; margin-bottom: 36px; }
  .filter-bar button {
    border: 1.5px solid var(--line); background: var(--white); color: var(--gray);
    padding: 8px 20px; border-radius: 24px; cursor: pointer; font-size: 14px; font-weight: 500; transition: 0.25s;
  }
  .filter-bar button.active, .filter-bar button:hover { border-color: var(--gold); color: var(--navy); background: rgba(214,158,46,0.08); }

  .case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
  .case {
    background: var(--white); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow);
    border: 1px solid var(--line); transition: all 0.3s ease;
  }
  .case:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
  .case .top { background: linear-gradient(135deg, var(--navy), var(--navy-light)); height: 110px; padding: 20px; color: var(--white); display: flex; flex-direction: column; justify-content: space-between; }
  .case .top .tag { align-self: flex-start; background: var(--gold); color: var(--navy); font-size: 12px; font-weight: 700; padding: 3px 12px; border-radius: 20px; }
  .case .top h3 { font-size: 18px; }
  .case .body { padding: 20px; }
  .case .body .row { display: flex; justify-content: space-between; padding: 9px 0; border-bottom: 1px dashed var(--line); font-size: 14px; }
  .case .body .row:last-child { border-bottom: none; }
  .case .body .row .k { color: var(--gray-light); }
  .case .body .row .v { color: var(--navy); font-weight: 600; }

  /* ---------- Contact ---------- */
  .contact-grid { display: grid; grid-template-columns: 1fr; gap: 40px; max-width: 820px; margin: 0 auto; }
  .form-wrap { background: var(--white); border-radius: var(--radius); padding: 36px; box-shadow: var(--shadow); border: 1px solid var(--line); }
  .form-wrap h3 { color: var(--navy); font-size: 22px; margin-bottom: 6px; }
  .form-wrap .sub { color: var(--gray); font-size: 14px; margin-bottom: 24px; }
  .field { margin-bottom: 18px; }
  .field label { display: block; font-size: 14px; font-weight: 600; color: var(--navy); margin-bottom: 7px; }
  .field label .req { color: #e53e3e; }
  .field input, .field select, .field textarea {
    width: 100%; padding: 12px 14px; border: 1.5px solid var(--line); border-radius: 9px;
    font-size: 15px; font-family: inherit; color: var(--ink); background: var(--bg); transition: 0.2s;
  }
  .field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--gold); background: var(--white); box-shadow: 0 0 0 3px rgba(214,158,46,0.12); }
  .field textarea { resize: vertical; min-height: 110px; }
  .field .err { color: #e53e3e; font-size: 12.5px; margin-top: 5px; display: none; }
  .field.invalid input, .field.invalid select, .field.invalid textarea { border-color: #e53e3e; background: #fff5f5; }
  .field.invalid .err { display: block; }
  .form-success { display: none; background: rgba(72,187,120,0.12); border: 1px solid #48bb78; color: #22543d; padding: 14px 18px; border-radius: 10px; margin-bottom: 18px; font-size: 14.5px; }
  .form-success.show { display: block; }

  .info-wrap { background: linear-gradient(135deg, var(--navy), var(--navy-deep)); color: var(--white); border-radius: var(--radius); padding: 36px; box-shadow: var(--shadow-lg); }
  .info-wrap h3 { font-size: 20px; margin-bottom: 22px; color: var(--gold-light); }
  .info-item { display: flex; gap: 14px; padding: 13px 0; border-bottom: 1px solid rgba(255,255,255,0.1); }
  .info-item:last-of-type { border-bottom: none; }
  .info-item .ii { font-size: 20px; color: var(--gold-light); flex-shrink: 0; width: 26px; }
  .info-item .it { font-size: 14.5px; }
  .info-item .it .lab { color: #cbd5e0; font-size: 12.5px; }

  /* ---------- Footer ---------- */
  footer { background: var(--navy-deep); color: #cbd5e0; padding: 50px 0 24px; }
  .foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 30px; margin-bottom: 36px; }
  footer h4 { color: var(--white); font-size: 16px; margin-bottom: 16px; }
  footer .logo { margin-bottom: 14px; }
  footer p { font-size: 14px; color: #a0aec0; }
  footer ul li { padding: 6px 0; font-size: 14px; }
  footer ul li a:hover { color: var(--gold-light); }
  .foot-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 20px; text-align: center; font-size: 13px; color: #718096; }

  /* ---------- Responsive ---------- */
  @media (max-width: 980px) {
    .hero-grid, .contact-grid, .about-intro { grid-template-columns: 1fr; }
    .card-grid, .qual-grid, .team-grid { grid-template-columns: repeat(2, 1fr); }
    .case-grid, .why-grid { grid-template-columns: repeat(2, 1fr); }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .foot-grid { grid-template-columns: 1fr 1fr; }
    .hero h1 { font-size: 36px; }
  }
  @media (max-width: 640px) {
    .nav-links {
      position: absolute; top: 70px; left: 0; right: 0;
      flex-direction: column; align-items: stretch; gap: 0;
      background: var(--navy-deep); padding: 10px; display: none; box-shadow: 0 10px 20px rgba(0,0,0,0.3);
    }
    .nav-links.open { display: flex; }
    .nav-links a { padding: 14px 16px; border-radius: 6px; }
    .hamburger { display: flex; }
    .card-grid, .qual-grid, .team-grid, .case-grid, .why-grid, .stats-grid { grid-template-columns: 1fr; }
    .foot-grid { grid-template-columns: 1fr; }
    .hero h1 { font-size: 30px; }
    .section-head h2 { font-size: 26px; }
    .cta-band { padding: 34px 22px; }
    .svc-block { grid-template-columns: 1fr; }
    .page { padding: 40px 0 60px; }
  }