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

body {
  font-family: 'Inter', sans-serif;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: #f8fafc;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

#app {
  width: 100%;
  max-width: 480px;
  padding: 20px;
}

.card {
  background: rgba(30, 41, 59, 0.7);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  padding: 40px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  animation: slideUp 0.5s ease-out;
}

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

.card-header {
  text-align: center;
  margin-bottom: 30px;
}

.card-header h1 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 10px;
  background: linear-gradient(to right, #38bdf8, #818cf8);
  -webkit-background-clip: text;
  color: transparent;
}

.card-header p {
  font-size: 14px;
  color: #94a3b8;
  line-height: 1.5;
}

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

.input-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 8px;
  color: #cbd5e1;
}

.input-group input {
  width: 100%;
  padding: 14px 16px;
  background: rgba(15, 23, 42, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  font-size: 15px;
  color: #f8fafc;
  transition: all 0.2s ease;
  outline: none;
}

.input-group input:focus {
  border-color: #38bdf8;
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
}

button {
  width: 100%;
  padding: 14px;
  background: linear-gradient(to right, #0ea5e9, #6366f1);
  color: white;
  border: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

button:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px -10px rgba(99, 102, 241, 0.5);
}

button:active {
  transform: translateY(0);
}

button:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 1s ease-in-out infinite;
  margin-left: 10px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.hidden {
  display: none !important;
}

#message-container {
  margin-top: 20px;
  padding: 16px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 500;
  text-align: center;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.msg-success {
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.2);
  color: #4ade80;
}

.msg-error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.2);
  color: #f87171;
}

/* Modal Styles */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(4px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 1;
  transition: opacity 0.3s ease;
}

.modal-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.modal-content {
  background: rgba(30, 41, 59, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  padding: 40px;
  max-width: 400px;
  width: 90%;
  text-align: center;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  transform: scale(1);
  transition: transform 0.3s ease;
}

.modal-overlay.hidden .modal-content {
  transform: scale(0.9);
}

.modal-icon {
  font-size: 48px;
  margin-bottom: 20px;
}

.modal-content h2 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 15px;
  color: #f8fafc;
}

.modal-content p {
  font-size: 15px;
  color: #cbd5e1;
  margin-bottom: 30px;
  line-height: 1.5;
}

.modal-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.btn-primary {
  display: block;
  width: 100%;
  padding: 14px;
  background: linear-gradient(to right, #0ea5e9, #6366f1);
  color: white;
  border-radius: 12px;
  text-decoration: none;
  font-size: 16px;
  font-weight: 600;
  transition: all 0.3s ease;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px -10px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
  width: 100%;
  padding: 14px;
  background: rgba(255, 255, 255, 0.05);
  color: #f8fafc;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
}