:root {
  --ieee-blue: #0066CC;
  --ieee-light-blue: #0080FF;
  --neon-glow: #00CCFF;
  --dark-bg: #0A0A0A;
  --card-bg: #1A1A1A;
  --text-light: #FFFFFF;
  --text-muted: #CCCCCC;
  --border-color: #333333;
  --success-green: #00FF88;
  --gradient-1: linear-gradient(135deg, var(--ieee-blue), var(--ieee-light-blue));
  --gradient-2: linear-gradient(135deg, var(--neon-glow), var(--ieee-blue));
}

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

body {
  font-family: 'Inter', sans-serif;
  background: var(--dark-bg);
  color: var(--text-light);
  overflow-x: hidden;
  min-height: 100vh;
}

.background-animation {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background: radial-gradient(circle at 20% 80%, var(--ieee-blue)15 0%, transparent 50%),
              radial-gradient(circle at 80% 20%, var(--neon-glow)15 0%, transparent 50%),
              var(--dark-bg);
}

.floating-particle {
  position: absolute;
  background: var(--neon-glow);
  border-radius: 50%;
  pointer-events: none;
  animation: float 6s ease-in-out infinite;
}

.floating-particle:nth-child(1) {
  width: 4px;
  height: 4px;
  top: 20%;
  left: 10%;
  animation-delay: 0s;
}

.floating-particle:nth-child(2) {
  width: 6px;
  height: 6px;
  top: 60%;
  left: 80%;
  animation-delay: -2s;
}

.floating-particle:nth-child(3) {
  width: 3px;
  height: 3px;
  top: 80%;
  left: 20%;
  animation-delay: -4s;
}

.floating-particle:nth-child(4) {
  width: 5px;
  height: 5px;
  top: 30%;
  left: 70%;
  animation-delay: -1s;
}

.floating-particle:nth-child(5) {
  width: 2px;
  height: 2px;
  top: 50%;
  left: 50%;
  animation-delay: -3s;
}

@keyframes float {
  0%, 100% { 
    transform: translateY(0px) rotate(0deg); 
    opacity: 0.3;
  }
  50% { 
    transform: translateY(-20px) rotate(180deg); 
    opacity: 1;
  }
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
  min-height: 100vh;
}

.header {
  text-align: center;
  margin-bottom: 40px;
  animation: fadeInDown 0.8s ease-out;
}

.ieee-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
  margin-bottom: 30px;
}

.logo-icon {
  font-size: 2.5rem;
  font-weight: 700;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 0 30px var(--ieee-blue);
}

.logo-text h1 {
  font-size: 1.8rem;
  font-weight: 600;
  margin-bottom: 5px;
  color: var(--text-light);
}

.logo-text p {
  color: var(--text-muted);
  font-size: 1rem;
}

.progress-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
}

.progress-step {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  border: 2px solid var(--border-color);
  transition: all 0.3s ease;
  background: var(--card-bg);
}

.progress-step.active {
  background: var(--gradient-1);
  border-color: var(--ieee-blue);
  box-shadow: 0 0 20px var(--ieee-blue)50;
}

.progress-line {
  width: 60px;
  height: 2px;
  background: var(--border-color);
  transition: all 0.3s ease;
}

.progress-line.active {
  background: var(--gradient-1);
  box-shadow: 0 0 10px var(--ieee-blue)50;
}

.main-content {
  position: relative;
}

.form-page {
  opacity: 0;
  transform: translateX(50px);
  transition: all 0.5s ease;
  position: absolute;
  width: 100%;
  top: 0;
  left: 0;
  pointer-events: none;
}

.form-page.active {
  opacity: 1;
  transform: translateX(0);
  position: relative;
  pointer-events: all;
}

.form-card {
  background: var(--card-bg);
  border-radius: 20px;
  padding: 40px;
  border: 1px solid var(--border-color);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  position: relative;
  overflow: hidden;
}

.form-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-1);
  box-shadow: 0 0 20px var(--ieee-blue);
}

.card-header {
  text-align: center;
  margin-bottom: 40px;
}

.glowing-text {
  font-size: 2rem;
  font-weight: 700;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 10px;
  text-shadow: 0 0 20px var(--ieee-blue);
}

.card-header p {
  color: var(--text-muted);
  font-size: 1.1rem;
}

.form {
  display: flex;
  flex-direction: column;
  gap: 25px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-weight: 500;
  color: var(--text-light);
  font-size: 0.95rem;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="tel"],
.form-group input[type="url"] {
  padding: 15px;
  border: 2px solid var(--border-color);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-light);
  font-size: 1rem;
  transition: all 0.3s ease;
}

.form-group input:focus {
  outline: none;
  border-color: var(--ieee-blue);
  box-shadow: 0 0 20px var(--ieee-blue)30;
  background: rgba(255, 255, 255, 0.08);
}

.radio-group, .checkbox-group {
  gap: 15px;
}

.radio-label, .checkbox-label {
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--text-light);
}

.radio-options {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.radio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 15px;
}

.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 15px;
}

.radio-option, .checkbox-option {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  padding: 15px;
  border: 2px solid var(--border-color);
  border-radius: 10px;
  transition: all 0.3s ease;
  background: rgba(255, 255, 255, 0.02);
}

.radio-option:hover, .checkbox-option:hover {
  border-color: var(--ieee-blue);
  background: rgba(0, 102, 204, 0.1);
  transform: translateY(-2px);
}

.radio-option input, .checkbox-option input {
  display: none;
}

.radio-custom, .checkbox-custom {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color);
  border-radius: 50%;
  position: relative;
  transition: all 0.3s ease;
}

.checkbox-custom {
  border-radius: 4px;
}

.radio-option input:checked + .radio-custom,
.checkbox-option input:checked + .checkbox-custom {
  border-color: var(--ieee-blue);
  background: var(--gradient-1);
  box-shadow: 0 0 15px var(--ieee-blue)50;
}

.radio-option input:checked + .radio-custom::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 8px;
  height: 8px;
  background: white;
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.checkbox-option input:checked + .checkbox-custom::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  color: white;
  font-size: 12px;
  font-weight: bold;
  transform: translate(-50%, -50%);
}

.radio-option input:checked ~ span:not(.radio-custom),
.checkbox-option input:checked ~ span:not(.checkbox-custom) {
  color: var(--ieee-light-blue);
  font-weight: 500;
}

.btn-next, .btn-back, .btn-submit {
  padding: 15px 30px;
  border: none;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  text-decoration: none;
}

.btn-next, .btn-submit {
  background: var(--gradient-1);
  color: white;
  box-shadow: 0 10px 30px var(--ieee-blue)30;
  position: relative;
  overflow: hidden;
}

.btn-next:hover, .btn-submit:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 40px var(--ieee-blue)40;
}

.btn-back {
  background: transparent;
  color: var(--text-muted);
  border: 2px solid var(--border-color);
}

.btn-back:hover {
  border-color: var(--ieee-blue);
  color: var(--ieee-light-blue);
  transform: translateY(-2px);
}

.btn-submit {
  position: relative;
  overflow: hidden;
}

.btn-glow {
  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 ease;
}

.btn-submit:hover .btn-glow {
  left: 100%;
}

.form-actions {
  display: flex;
  gap: 15px;
  justify-content: space-between;
  margin-top: 20px;
}

.success-card {
  text-align: center;
  padding: 60px 40px;
  background: var(--card-bg);
  border-radius: 20px;
  border: 1px solid var(--border-color);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.success-icon {
  font-size: 4rem;
  color: var(--success-green);
  margin-bottom: 20px;
  animation: bounce 0.6s ease-out;
}

.success-card h2 {
  font-size: 2rem;
  margin-bottom: 15px;
  color: var(--text-light);
}

.success-card p {
  color: var(--text-muted);
  font-size: 1.1rem;
}

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

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-30px);
  }
  60% {
    transform: translateY(-15px);
  }
}

@media (max-width: 768px) {
  .container {
    padding: 10px;
  }
  
  .form-card {
    padding: 20px;
    margin: 0;
    border-radius: 15px;
  }
  
  .glowing-text {
    font-size: 1.6rem;
  }
  
  .logo-icon {
    font-size: 2rem;
  }
  
  .logo-text h1 {
    font-size: 1.4rem;
  }
  
  .checkbox-grid, .radio-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  
  .radio-options {
    justify-content: center;
  }
  
  .form-actions {
    flex-direction: column;
  }
  
  .progress-bar {
    gap: 15px;
  }
  
  .progress-step {
    width: 35px;
    height: 35px;
  }
  
  .progress-line {
    width: 40px;
  }
  
  .checkbox-option, .radio-option {
    padding: 12px;
    font-size: 0.9rem;
  }
  
  .btn-next, .btn-back, .btn-submit {
    padding: 12px 20px;
    font-size: 0.95rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 8px;
  }
  
  .ieee-logo {
    flex-direction: column;
    gap: 10px;
  }
  
  .form-card {
    padding: 16px;
    border-radius: 12px;
  }
  
  .checkbox-option, .radio-option {
    padding: 10px;
    font-size: 0.85rem;
  }
  
  .glowing-text {
    font-size: 1.4rem;
  }
  
  .card-header p {
    font-size: 1rem;
  }
  
  .form-group label {
    font-size: 0.9rem;
  }
  
  .form-group input[type="text"],
  .form-group input[type="email"],
  .form-group input[type="tel"],
  .form-group input[type="url"] {
    padding: 12px;
    font-size: 0.95rem;
  }
  
  .radio-label, .checkbox-label {
    font-size: 1rem;
  }
  
  .btn-next, .btn-back, .btn-submit {
    padding: 12px 16px;
    font-size: 0.9rem;
  }
  
  .progress-bar {
    gap: 10px;
  }
  
  .progress-step {
    width: 30px;
    height: 30px;
    font-size: 0.85rem;
  }
  
  .progress-line {
    width: 30px;
  }
}

@media (max-width: 360px) {
  .container {
    padding: 5px;
  }
  
  .form-card {
    padding: 12px;
  }
  
  .glowing-text {
    font-size: 1.2rem;
  }
  
  .logo-icon {
    font-size: 1.8rem;
  }
  
  .logo-text h1 {
    font-size: 1.2rem;
  }
  
  .checkbox-option, .radio-option {
    padding: 8px;
    font-size: 0.8rem;
  }
  
  .form-group input[type="text"],
  .form-group input[type="email"],
  .form-group input[type="tel"],
  .form-group input[type="url"] {
    padding: 10px;
    font-size: 0.9rem;
  }
  
  .btn-next, .btn-back, .btn-submit {
    padding: 10px 14px;
    font-size: 0.85rem;
  }
}