/* Hiop.io inspired styles */
:root {
  --hiop-primary: #275ed8;
  --hiop-primary-dark: #191e6c;
  --hiop-text-dark: #0f1242;
  --hiop-text-light: #91919c;
  --hiop-bg-light: #f8f9fa;
  --hiop-border: #e3e3e3;
  --hiop-shadow: 0 4px 20px rgba(39, 94, 216, 0.1);
  --hiop-radius: 8px;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
  color: var(--hiop-text-dark);
  line-height: 1.6;
}

body {
  margin: 0;
  padding: 0;
}

/* Registration Card */
.registration-card {
  background: white;
  border-radius: var(--hiop-radius);
  box-shadow: var(--hiop-shadow);
  padding: 2.5rem;
  max-width: 450px;
  margin: 0 auto;
  border: 1px solid var(--hiop-border);
  position: relative;
  overflow: hidden;
}

.registration-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--hiop-primary) 0%, var(--hiop-primary-dark) 100%);
}

/* Logo */
.logo {
  border-radius: var(--hiop-radius);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s ease;
}

.logo:hover {
  transform: scale(1.05);
}

/* Typography */
.main-title {
  font-family: 'Work Sans', sans-serif;
  font-size: 2.25rem;
  font-weight: 600;
  color: var(--hiop-primary-dark);
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.subtitle {
  font-size: 1.125rem;
  color: var(--hiop-text-light);
  margin-bottom: 2rem;
  font-weight: 400;
}

.form-label {
  font-family: 'Inter', sans-serif;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--hiop-text-dark);
  margin-bottom: 0.5rem;
  display: block;
  letter-spacing: 0.01em;
  transition: color 0.2s ease;
}

/* Form Controls */
.form-control {
  border: 1px solid var(--hiop-border);
  border-radius: var(--hiop-radius);
  padding: 0.875rem 1rem;
  font-size: 1rem;
  font-family: 'Inter', sans-serif;
  transition: all 0.2s ease;
  background-color: white;
  color: var(--hiop-text-dark);
  position: relative;
}

.form-control:focus {
  border-color: var(--hiop-primary);
  box-shadow: 0 0 0 3px rgba(39, 94, 216, 0.1);
  outline: none;
  transform: translateY(-1px);
}

.form-control::placeholder {
  color: var(--hiop-text-light);
  opacity: 0.7;
}

.form-group {
  margin-bottom: 1.5rem;
  position: relative;
}

.form-group.focused .form-label {
  color: var(--hiop-primary);
}

/* Button */
.submit-btn {
  background: var(--hiop-primary);
  border: none;
  border-radius: var(--hiop-radius);
  padding: 0.875rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  font-family: 'Inter', sans-serif;
  color: white;
  transition: all 0.2s ease;
  margin-top: 1rem;
  letter-spacing: 0.01em;
  position: relative;
  overflow: hidden;
}

.submit-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 ease;
}

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

.submit-btn:hover {
  background: var(--hiop-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 6px 25px rgba(39, 94, 216, 0.2);
}

.submit-btn:active {
  transform: translateY(0);
}

.submit-btn:focus {
  box-shadow: 0 0 0 3px rgba(39, 94, 216, 0.2);
}

/* Footer */
.footer-text {
  font-size: 0.875rem;
  color: var(--hiop-text-light);
  margin: 0;
  font-weight: 400;
}

/* Alerts */
.alert {
  border-radius: var(--hiop-radius);
  border: none;
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
  font-family: 'Inter', sans-serif;
  font-size: 0.875rem;
  transition: opacity 0.3s ease;
  position: relative;
  overflow: hidden;
}

.alert::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
}

.alert-primary {
  background-color: rgba(39, 94, 216, 0.1);
  color: var(--hiop-primary-dark);
}

.alert-primary::before {
  background-color: var(--hiop-primary);
}

.alert-danger {
  background-color: rgba(220, 53, 69, 0.1);
  color: #721c24;
}

.alert-danger::before {
  background-color: #dc3545;
}

.alert-success {
  background-color: rgba(40, 167, 69, 0.1);
  color: #155724;
}

.alert-success::before {
  background-color: #28a745;
}

/* Loading spinner */
.spinner-border-sm {
  width: 1rem;
  height: 1rem;
  border-width: 0.125em;
}

/* Responsive Design */
@media (max-width: 768px) {
  .registration-card {
    padding: 2rem 1.5rem;
    margin: 1rem;
  }
  
  .main-title {
    font-size: 1.875rem;
  }
  
  .subtitle {
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .registration-card {
    padding: 1.5rem 1rem;
  }
  
  .main-title {
    font-size: 1.5rem;
  }
}

/* Loading state */
.submit-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

.submit-btn:disabled::before {
  display: none;
}

/* Focus styles for accessibility */
.form-control:focus,
.submit-btn:focus {
  outline: none;
}

/* Smooth transitions */
* {
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

/* Animation for card entrance */
@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.registration-card {
  animation: slideInUp 0.6s ease-out;
}

/* Hover effects for interactive elements */
.form-control:hover {
  border-color: var(--hiop-primary);
}

/* Success state for form fields */
.form-control.is-valid {
  border-color: #28a745;
  box-shadow: 0 0 0 3px rgba(40, 167, 69, 0.1);
}

.form-control.is-invalid {
  border-color: #dc3545;
  box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.1);
}