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

    body {
      font-family: "Inter", system-ui, -apple-system, sans-serif;
      background: #fafbfc;
      color: #1e293b;
      line-height: 1.5;
    }

    /* modern container */
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 2rem;
    }

    /* header – placeholder nav */
    .site-header {
      background-color: #ffffffdd;
      backdrop-filter: blur(6px);
      -webkit-backdrop-filter: blur(6px);
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
      position: sticky;
      top: 0;
      z-index: 10;
      padding: 0.8rem 0;
      border-bottom: 1px solid #e9edf2;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }

    .logo a {
      font-weight: 700;
      font-size: 1.7rem;
      letter-spacing: -0.02em;
      color: #0f2b4b;
      text-decoration: none;
    }

    .logo span {
      color: #3b7cff;
      margin-left: 4px;
    }

    .nav-links {
      display: flex;
      gap: 2.2rem;
      align-items: center;
    }

    .nav-links a {
      text-decoration: none;
      font-weight: 500;
      color: #334155;
      transition: color 0.15s;
      font-size: 1rem;
    }

    .nav-links a:hover {
      color: #3b7cff;
    }

    .btn-placeholder {
      background: #eaf1ff;
      color: #1e4fd9;
      padding: 0.5rem 1.3rem;
      border-radius: 40px;
      font-weight: 600;
      font-size: 0.9rem;
      transition: all 0.2s;
      border: 1px solid transparent;
    }

    .btn-placeholder:hover {
      background: #d4e2ff;
      border-color: #b8ceff;
    }

    /* main hero — large placeholder area */
    .hero {
      padding: 4rem 0 5rem 0;
      background: linear-gradient(145deg, #ffffff 0%, #f5f9ff 100%);
      border-bottom: 1px solid #e6ecf5;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
      flex-wrap: wrap;
    }

    .hero-content {
      flex: 1 1 380px;
    }

    .hero-badge {
      display: inline-block;
      background: #e9efff;
      color: #1f4fcf;
      font-weight: 600;
      font-size: 0.8rem;
      letter-spacing: 0.3px;
      padding: 0.25rem 1rem;
      border-radius: 30px;
      margin-bottom: 1.5rem;
      border: 1px solid #ccddff;
    }

    .hero-content h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.03em;
      color: #0b1f33;
      margin-bottom: 1.2rem;
    }

    .hero-content h1 span {
      color: #3b7cff;
      border-bottom: 3px solid #b5d0ff;
    }

    .hero-description {
      font-size: 1.2rem;
      color: #36454F;
      max-width: 550px;
      margin-bottom: 2rem;
      font-weight: 350;
    }

    .placeholder-tagline {
      background: #f1f4f9;
      padding: 0.8rem 1.2rem;
      border-radius: 60px;
      display: inline-flex;
      align-items: center;
      gap: 0.6rem;
      font-weight: 450;
      border: 1px dashed #8aa9e0;
      color: #1d3a78;
    }

    .placeholder-tagline i {
      color: #3b7cff;
      font-size: 1.2rem;
    }

    .hero-image {
      flex: 1 1 380px;
      background: #d9e5ff;
      border-radius: 40px;
      min-height: 280px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #2d4b8c;
      font-size: 1.4rem;
      font-weight: 350;
      box-shadow: 0 25px 35px -15px rgba(48, 87, 163, 0.2);
      background-image: radial-gradient(circle at 20px 20px, #c0d4ff 1.8px, transparent 1px);
      background-size: 35px 35px;
      border: 2px solid white;
    }

    .hero-image p {
      background: rgba(255, 255, 255, 0.7);
      backdrop-filter: blur(4px);
      padding: 0.6rem 2rem;
      border-radius: 80px;
      border: 1px solid white;
    }

    /* featured / about placeholder */
    .section {
      padding: 4rem 0;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 650;
      letter-spacing: -0.02em;
      margin-bottom: 0.5rem;
    }

    .section-sub {
      color: #546e7a;
      max-width: 700px;
      margin-bottom: 2.5rem;
      font-size: 1.15rem;
    }

    .cards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 2rem;
      margin: 2.5rem 0;
    }

    .card {
      background: white;
      padding: 2rem 1.5rem;
      border-radius: 32px;
      box-shadow: 0 10px 25px -8px rgba(0,0,0,0.04);
      border: 1px solid #edf2f9;
      transition: all 0.2s;
    }

    .card:hover {
      box-shadow: 0 20px 30px -10px rgba(59, 124, 255, 0.12);
      border-color: #cddeff;
    }

    .card-icon {
      background: #eaf1ff;
      width: 48px;
      height: 48px;
      border-radius: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #2f62d3;
      font-size: 1.6rem;
      margin-bottom: 1.4rem;
    }

    .card h3 {
      font-size: 1.5rem;
      font-weight: 640;
      margin-bottom: 0.5rem;
    }

    .card p {
      color: #3f536e;
    }

    /* schedule placeholder – minimal timeline */
    .schedule-preview {
      background: #f5f8ff;
      border-radius: 40px;
      padding: 2.5rem;
      border: 1px solid #dbe7fe;
      margin: 2rem 0;
    }

    .schedule-item {
      display: flex;
      align-items: center;
      gap: 2rem;
      padding: 1rem 0;
      border-bottom: 1px solid #d1dffc;
      flex-wrap: wrap;
    }

    .schedule-item:last-child {
      border-bottom: 0;
    }

    .schedule-time {
      font-weight: 650;
      background: white;
      padding: 0.2rem 1.2rem;
      border-radius: 60px;
      color: #1f4fcf;
      border: 1px solid #adc6fd;
      font-size: 0.9rem;
    }

    .schedule-title {
      font-weight: 550;
      flex: 1;
    }

    .schedule-placeholder {
      color: #6e85b0;
      font-style: italic;
      background: #e9efff;
      padding: 0.2rem 1rem;
      border-radius: 40px;
      font-size: 0.85rem;
    }

    /* CTA placeholder */
    .cta-box {
      background: #111c33;
      color: white;
      border-radius: 40px;
      padding: 3.5rem 2.5rem;
      text-align: center;
      margin: 3rem 0 1rem;
    }

    .cta-box h2 {
      font-size: 2.5rem;
      font-weight: 650;
      letter-spacing: -0.02em;
    }

    .cta-box .light-color {
      color: #b3d0ff;
      font-size: 1.25rem;
      margin: 1rem 0 2rem;
    }

    .btn-cta-placeholder {
      background: white;
      color: #0e1f3a;
      padding: 1rem 3rem;
      border-radius: 60px;
      font-weight: 600;
      font-size: 1.1rem;
      border: none;
      transition: 0.15s;
      cursor: pointer;
      box-shadow: 0 8px 18px rgba(0,30,70,0.3);
      border: 1px solid rgba(255,255,255,0.5);
    }

    .btn-cta-placeholder:hover {
      background: #edf3ff;
      transform: scale(1.02);
    }

    /* footer placeholder */
    .footer {
      border-top: 1px solid #dfe7f2;
      padding: 2.5rem 0;
      margin-top: 2rem;
      color: #4d627a;
    }

    .footer-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 1rem;
    }

    .footer small i {
      color: #7b9eff;
    }

    .social-placeholders i {
      font-size: 1.5rem;
      margin-left: 1.2rem;
      color: #a0b8da;
      transition: color 0.15s;
    }

    .social-placeholders i:hover {
      color: #3b7cff;
    }

    /* mobile touches */
    @media (max-width: 650px) {
      .header-inner { flex-direction: column; gap: 0.8rem; }
      .nav-links { flex-wrap: wrap; justify-content: center; gap: 1rem; }
      .hero-content h1 { font-size: 2.5rem; }
      .cta-box h2 { font-size: 1.8rem; }
    }

    /* small JS demo (placeholder interactive) */
    #demo-alert-btn {
      background: none;
      border: 1px solid currentColor;
      padding: 0.2rem 1rem;
      border-radius: 40px;
      font-weight: 500;
      cursor: pointer;
      transition: 0.1s;
    }
    #demo-alert-btn:hover {
      background: #eef4ff;
    }