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

    body {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      line-height: 1.6;
      color: #333;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      min-height: 100vh;
      overflow-x: hidden;
    }

    .background-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(135deg, rgba(102, 126, 234, 0.9) 0%, rgba(118, 75, 162, 0.9) 100%);
      z-index: -1;
    }

    .particles {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: -1;
      pointer-events: none;
    }

    .particle {
      position: absolute;
      width: 4px;
      height: 4px;
      background: rgba(255, 255, 255, 0.7);
      border-radius: 50%;
      animation: float 6s ease-in-out infinite;
    }

    @keyframes float {
      0%, 100% { transform: translateY(0px) rotate(0deg); opacity: 1; }
      50% { transform: translateY(-20px) rotate(180deg); opacity: 0.5; }
    }

    .container {
      max-width: 1000px;
      margin: 0 auto;
      padding: 20px;
      position: relative;
      z-index: 1;
    }

    .form-wrapper {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-radius: 20px;
      padding: 40px;
      box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
      animation: slideUp 0.8s ease-out;
      margin: 20px 0;
    }

    @keyframes slideUp {
      from {
        opacity: 0;
        transform: translateY(50px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .logo {
      text-align: center;
      margin-bottom: 30px;
      animation: fadeIn 1s ease-out 0.3s both;
    }

    .logo-placeholder {
      width: 200px;
      height: 80px;
      background: linear-gradient(135deg, #667eea, #764ba2);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto;
      color: white;
      font-weight: bold;
      font-size: 16px;
      text-transform: uppercase;
      letter-spacing: 2px;
    }

    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(-20px); }
      to { opacity: 1; transform: translateY(0); }
    }

    h1 {
      font-size: clamp(20px, 4vw, 28px);
      font-weight: 700;
      text-align: center;
      color: #2c3e50;
      margin-bottom: 20px;
      animation: fadeIn 1s ease-out 0.5s both;
      line-height: 1.4;
    }

    .intro {
      font-size: clamp(14px, 2.5vw, 16px);
      text-align: center;
      color: #34495e;
      margin-bottom: 25px;
      animation: fadeIn 1s ease-out 0.7s both;
      line-height: 1.6;
    }

    .schedule {
      background: linear-gradient(135deg, #e74c3c, #c0392b);
      color: white;
      padding: 20px;
      border-radius: 15px;
      text-align: center;
      font-weight: 600;
      margin-bottom: 30px;
      animation: fadeIn 1s ease-out 0.9s both;
      box-shadow: 0 8px 25px rgba(231, 76, 60, 0.3);
    }

    .schedule-item {
      margin: 8px 0;
      font-size: clamp(13px, 2.2vw, 15px);
    }

    .form-section {
      margin-bottom: 30px;
      padding: 25px;
      background: rgba(255, 255, 255, 0.8);
      border-radius: 15px;
      border-left: 5px solid;
      animation: slideInLeft 0.6s ease-out;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .form-section:hover {
      transform: translateY(-5px);
      box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
    }

    @keyframes slideInLeft {
      from {
        opacity: 0;
        transform: translateX(-30px);
      }
      to {
        opacity: 1;
        transform: translateX(0);
      }
    }

    .section-institution { border-left-color: #3498db; }
    .section-speaker1 { border-left-color: #9b59b6; }
    .section-speaker2 { border-left-color: #27ae60; }
    .section-researcher { border-left-color: #e67e22; }
    .section-accommodation { border-left-color: #34495e; }

    .section-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 20px;
      color: #2c3e50;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .section-icon {
      width: 24px;
      height: 24px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: bold;
      font-size: 14px;
    }

    .input-group {
      margin-bottom: 20px;
      position: relative;
    }

    label {
      display: block;
      font-weight: 600;
      margin-bottom: 8px;
      color: #34495e;
      font-size: 14px;
      transition: color 0.3s ease;
    }

    input, select {
      width: 100%;
      padding: 15px 20px;
      border: 2px solid #e0e0e0;
      border-radius: 10px;
      font-size: 16px;
      transition: all 0.3s ease;
      background: white;
      font-family: inherit;
    }

    input:focus, select:focus {
      outline: none;
      border-color: #667eea;
      box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
      transform: translateY(-2px);
    }

    input:valid {
      border-color: #27ae60;
    }

    .btn {
      width: 100%;
      padding: 18px;
      background: linear-gradient(135deg, #667eea, #764ba2);
      color: white;
      border: none;
      border-radius: 50px;
      font-size: 18px;
      font-weight: 700;
      cursor: pointer;
      transition: all 0.3s ease;
      text-transform: uppercase;
      letter-spacing: 1px;
      position: relative;
      overflow: hidden;
    }

    .btn::before {
      content: '';
      position: absolute;
      top: 0;
      left: -100%;
      width: 100%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
      transition: left 0.5s;
    }

    .btn:hover {
      transform: translateY(-3px);
      box-shadow: 0 15px 30px rgba(102, 126, 234, 0.4);
    }

    .btn:hover::before {
      left: 100%;
    }

    .btn:active {
      transform: translateY(-1px);
    }

    .grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
    }

    .loading-spinner {
      display: none;
      width: 20px;
      height: 20px;
      border: 2px solid transparent;
      border-top: 2px solid white;
      border-radius: 50%;
      animation: spin 1s linear infinite;
      margin-right: 10px;
    }

    @keyframes spin {
      0% { transform: rotate(0deg); }
      100% { transform: rotate(360deg); }
    }

    /* Mobile Responsiveness */
    @media (max-width: 768px) {
      .container {
        padding: 10px;
      }

      .form-wrapper {
        padding: 25px 20px;
        margin: 10px 0;
      }

      .form-section {
        padding: 20px 15px;
      }

      .grid {
        grid-template-columns: 1fr;
        gap: 15px;
      }

      h1 {
        font-size: 20px;
        line-height: 1.3;
      }

      .intro {
        font-size: 14px;
      }

      .schedule-item {
        font-size: 13px;
        margin: 6px 0;
      }

      input, select {
        padding: 12px 15px;
        font-size: 16px; /* Prevent zoom on iOS */
      }

      .btn {
        padding: 15px;
        font-size: 16px;
      }
    }

    @media (max-width: 480px) {
      .form-wrapper {
        padding: 20px 15px;
        border-radius: 15px;
      }

      .logo-placeholder {
        width: 150px;
        height: 60px;
        font-size: 14px;
      }

      .section-title {
        font-size: 16px;
      }
    }

    /* High contrast mode support */
    @media (prefers-contrast: high) {
      .form-wrapper {
        background: white;
        border: 2px solid #000;
      }

      input, select {
        border: 2px solid #000;
      }
    }

    /* Reduced motion support */
    @media (prefers-reduced-motion: reduce) {
      * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
      }
    }

    .logo-placeholder {
  max-width: 200px;
  height: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
}

.logo-placeholder img {
  width: 100%;
  height: auto;
  object-fit: contain;
}