:root {
      --bg-main: #f5f7fa;
      --card-bg: #ffffff;
      --card-shadow: 0 14px 60px 0 rgba(0, 0, 0, 0.08), 0 1.5px 9px 0 rgba(0, 0, 0, 0.04);
      --blue-accent: #3494fa;
      --blue-hover: #2272c2;
      --border-radius: 22px;
      --text-primary: #1a1a1a;
      --text-secondary: #666;
      --border-color: #e0e4e8;
      --input-bg: #f8f9fb;
      --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
      --gradient-tertiary: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    }

    * {
      box-sizing: border-box;
    }

    html, body {
      margin: 0;
      padding: 0;
      width: 100vw;
      height: 100%;
      background: var(--bg-main);
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      color: var(--text-primary);
      overflow-x: hidden;
    }

.top-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  min-width: 0;
  max-width: 100%;
  box-sizing: border-box;
  height: 66px;
  background: #ffffff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 38px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  z-index: 1000;
}

    .nav-logo {
      display: flex;
      align-items: center;
      gap: 15px;
      font-weight: 800;
      font-size: 1.46rem;
      color: var(--blue-accent);
      user-select: none;
      white-space: nowrap;
    }

    .nav-logo img {
      width: 35px;
      height: 35px;
      border-radius: 9px;
      object-fit: cover;
    }

    .nav-menu {
      display: flex;
      gap: 24px;
      list-style: none;
      margin: 0;
      padding: 0;
    }

    .nav-menu li a {
      color: var(--text-secondary);
      font-weight: 600;
      text-decoration: none;
      font-size: 1.09em;
      padding: 3.5px 0;
      transition: color 0.17s;
      position: relative;
    }

    .nav-menu li a.active,
    .nav-menu li a:hover {
      color: var(--blue-accent);
    }

    .nav-menu li a.active::after,
    .nav-menu li a:hover::after {
      content: '';
      display: block;
      margin: 0 auto;
      margin-top: 3px;
      width: 34%;
      height: 3px;
      border-radius: 3px;
      background: var(--blue-accent);
    }

    .main-container {
      min-height: calc(100vh - 66px);
      padding: 40px 20px;
    }

    .hero-section {
      max-width: 1200px;
      margin: 0 auto 50px;
      text-align: center;
      padding: 60px 20px 40px;
      background: linear-gradient(135deg, rgba(102, 126, 234, 0.08) 0%, rgba(118, 75, 162, 0.08) 100%);
      border-radius: 24px;
    }

    .hero-section h1 {
      margin: 0 0 15px 0;
      font-size: 3rem;
      font-weight: 800;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .hero-section .tagline {
      font-size: 1.3rem;
      color: var(--text-secondary);
      margin-bottom: 25px;
      font-weight: 500;
    }

    .event-details {
      display: flex;
      justify-content: center;
      gap: 40px;
      flex-wrap: wrap;
      margin-top: 30px;
    }

    .detail-item {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.05rem;
      color: var(--text-primary);
      font-weight: 600;
    }

    .detail-item svg {
      width: 24px;
      height: 24px;
      fill: var(--blue-accent);
    }

    .info-section {
      max-width: 1200px;
      margin: 0 auto 50px;
      padding: 0 20px;
    }

    .info-cards {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 25px;
      margin-bottom: 50px;
    }

    .info-card {
      background: var(--card-bg);
      border-radius: 16px;
      padding: 30px;
      box-shadow: var(--card-shadow);
      transition: transform 0.3s, box-shadow 0.3s;
    }

    .info-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 20px 70px 0 rgba(0, 0, 0, 0.12);
    }

    .info-card h3 {
      margin: 0 0 15px 0;
      font-size: 1.4rem;
      color: var(--blue-accent);
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .info-card p {
      margin: 0;
      color: var(--text-secondary);
      line-height: 1.6;
    }

    .info-card .stat {
      font-size: 2rem;
      font-weight: 800;
      color: var(--blue-accent);
      margin-top: 10px;
    }

    .cta-section {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    .cta-section h2 {
      text-align: center;
      font-size: 2.2rem;
      margin-bottom: 40px;
      color: var(--text-primary);
    }

    .cta-cards {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 30px;
      margin-bottom: 60px;
    }

    .cta-card {
      background: var(--card-bg);
      border-radius: var(--border-radius);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: all 0.3s;
      position: relative;
    }

    .cta-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 20px 70px 0 rgba(0, 0, 0, 0.15);
    }

    .cta-card-header {
      height: 140px;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .cta-card-header.gradient-1 {
      background: var(--gradient-primary);
    }

    .cta-card-header.gradient-2 {
      background: var(--gradient-secondary);
    }

    .cta-card-header.gradient-3 {
      background: var(--gradient-tertiary);
    }

    .cta-card-header::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><circle cx="50" cy="50" r="2" fill="rgba(255,255,255,0.15)"/></svg>');
      background-size: 40px 40px;
      opacity: 0.4;
    }

    .cta-card-header svg {
      width: 60px;
      height: 60px;
      fill: white;
      z-index: 1;
    }

    .cta-card-body {
      padding: 35px 30px;
    }

    .cta-card-body h3 {
      margin: 0 0 15px 0;
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--text-primary);
    }

    .cta-card-body p {
      margin: 0 0 25px 0;
      color: var(--text-secondary);
      line-height: 1.6;
      font-size: 1rem;
    }

    .cta-btn {
      display: inline-block;
      width: 100%;
      padding: 14px 24px;
      background: var(--blue-accent);
      color: white;
      text-decoration: none;
      border-radius: 10px;
      font-weight: 700;
      font-size: 1.05rem;
      text-align: center;
      transition: all 0.2s;
    }

    .cta-btn:hover {
      background: var(--blue-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(52, 148, 250, 0.3);
    }

    .cta-btn.secondary {
      background: transparent;
      border: 2px solid var(--blue-accent);
      color: var(--blue-accent);
    }

    .cta-btn.secondary:hover {
      background: rgba(52, 148, 250, 0.08);
    }

    .about-section {
      max-width: 900px;
      margin: 60px auto;
      padding: 40px;
      background: var(--card-bg);
      border-radius: 20px;
      box-shadow: var(--card-shadow);
      text-align: center;
    }

    .about-section h2 {
      font-size: 2rem;
      margin-bottom: 20px;
      color: var(--text-primary);
    }

    .about-section p {
      color: var(--text-secondary);
      line-height: 1.8;
      font-size: 1.05rem;
      margin-bottom: 15px;
    }

    .highlights {
      display: flex;
      justify-content: center;
      gap: 50px;
      flex-wrap: wrap;
      margin-top: 30px;
      padding-top: 30px;
      border-top: 2px solid var(--border-color);
    }

    .highlight-item {
      text-align: center;
    }

    .highlight-item .number {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--blue-accent);
      display: block;
    }

    .highlight-item .label {
      color: var(--text-secondary);
      font-weight: 600;
      margin-top: 5px;
    }

    footer {
      background: #ffffff;
      padding: 30px 20px;
      text-align: center;
      color: var(--text-secondary);
      box-shadow: 0 -2px 12px rgba(0, 0, 0, 0.06);
      margin-top: 60px;
    }

    footer p {
      margin: 5px 0;
      font-size: 0.95rem;
    }

    footer a {
      color: var(--blue-accent);
      text-decoration: none;
      font-weight: 600;
    }

    footer a:hover {
      text-decoration: underline;
    }

    @media (max-width: 768px) {
      .top-nav {
        padding: 0 20px;
      }

      .nav-logo {
        font-size: 1.2rem;
      }

      .nav-menu {
        display: none;
      }

      .hero-section h1 {
        font-size: 2rem;
      }

      .hero-section .tagline {
        font-size: 1.1rem;
      }

      .event-details {
        gap: 20px;
      }

      .detail-item {
        font-size: 0.95rem;
      }

      .cta-section h2 {
        font-size: 1.8rem;
      }

      .cta-cards {
        grid-template-columns: 1fr;
      }

      .highlights {
        gap: 30px;
      }

      .about-section {
        padding: 30px 20px;
      }
    }