/* ========== PUBLIC STYLES ========== */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    }

    body {
      background-color: #ffffff;
      color: #1e2b3c;
      line-height: 1.5;
      overflow-x: hidden;
    }

    /* global container */
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }

    /* fixed top navigation */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background-color: rgba(10, 25, 47, 0.95);
      backdrop-filter: blur(8px);
      z-index: 1000;
      padding: 16px 0;
      border-bottom: 1px solid rgba(212, 175, 55, 0.2);
      transition: all 0.3s ease;
    }

    .navbar .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo {
      font-size: 28px;
      font-weight: 600;
      letter-spacing: 1px;
      color: #ffffff;
      text-decoration: none;
    }
    .logo span {
      color: #d4af37; /* gold */
      font-weight: 300;
    }

    .nav-menu {
      display: flex;
      gap: 36px;
      list-style: none;
    }
    .nav-menu a {
      color: #e0e4e8;
      text-decoration: none;
      font-weight: 500;
      font-size: 16px;
      transition: 0.2s;
      padding-bottom: 4px;
      border-bottom: 2px solid transparent;
    }
    .nav-menu a:hover {
      color: #d4af37;
      border-bottom-color: #d4af37;
    }

    /* footer */
    .footer {
      background-color: #0a192f;
      color: #a0b3d9;
      padding: 60px 0 30px;
      border-top: 1px solid #1e3a5f;
    }
    .footer .container {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
    }
    .footer-logo {
      font-size: 22px;
      font-weight: 600;
      color: #fff;
      margin-bottom: 16px;
    }
    .footer-logo span { color: #d4af37; }
    .footer-about {
      font-size: 14px;
      line-height: 1.7;
      margin-bottom: 20px;
    }
    .footer-nav h4, .footer-contact h4, .footer-friend h4 {
      color: #fff;
      font-size: 18px;
      margin-bottom: 20px;
      font-weight: 500;
    }
    .footer-nav ul, .footer-friend ul {
      list-style: none;
    }
    .footer-nav li, .footer-friend li {
      margin-bottom: 12px;
    }
    .footer-nav a, .footer-friend a {
      color: #a0b3d9;
      text-decoration: none;
      font-size: 14px;
      transition: 0.2s;
    }
    .footer-nav a:hover, .footer-friend a:hover {
      color: #d4af37;
    }
    .footer-contact p {
      margin-bottom: 12px;
      font-size: 14px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .footer-contact i {
      color: #d4af37;
      width: 20px;
    }
    .wechat-qr {
      display: flex;
      flex-direction: column;
      align-items: center;
      background: #fff;
      padding: 10px;
      border-radius: 8px;
      width: 120px;
      margin-top: 10px;
    }
    .wechat-qr img {
      width: 100%;
      height: auto;
      display: block;
    }
    .wechat-qr span {
      color: #0a192f;
      font-size: 12px;
      margin-top: 4px;
    }
    .copyright {
      grid-column: 1 / -1;
      text-align: center;
      padding-top: 40px;
      margin-top: 20px;
      border-top: 1px solid #1e3a5f;
      font-size: 14px;
      color: #6d8bb0;
    }

    /* common heading styles */
    .section-title {
      font-size: 36px;
      font-weight: 600;
      color: #0a192f;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    .section-title span {
      color: #d4af37;
      border-bottom: 3px solid #d4af37;
      padding-bottom: 4px;
    }
    .section-subtitle {
      font-size: 18px;
      color: #5a6e85;
      margin-bottom: 48px;
      max-width: 700px;
    }

    /* decoration */
    .gold-border {
      border: 1px solid #d4af37;
    }

    /* images responsive */
    img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    /* fade on scroll (for intersection observer) */
    .fade-onscroll {
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 0.9s cubic-bezier(0.25, 0.46, 0.45, 0.94), transform 0.9s ease;
    }
    .fade-onscroll.visible {
      opacity: 1;
      transform: translateY(0);
    }