body {
  font-family: 'Inter', sans-serif;
  background: linear-gradient(135deg, #0a0a0a 0%, #000000 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  padding: 1rem;
}

.auth-panel {
  max-width: 420px;
  width: 100%;
  background: rgba(0, 0, 0, 0.95);
  backdrop-filter: blur(10px);
  padding: 2.5rem;
  border-radius: 20px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.3), 0 0 0 1px rgba(34, 197, 94, 0.25);
  border: 1px solid rgba(34, 197, 94, 0.35);
}

.auth-header {
  text-align: center;
  margin-bottom: 2rem;
}

.auth-header h1 {
  color: #fff;
  font-size: 2rem;
  font-weight: 700;
  margin: 0 0 0.5rem 0;
  background: linear-gradient(135deg, #16a34a, #22c55e);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.auth-header p {
  color: #a3a3a3;
  margin: 0;
  font-size: 0.95rem;
}

.tab-buttons {
  display: flex;
  background: #111111;
  border-radius: 12px;
  padding: 4px;
  margin-bottom: 2rem;
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.3);
}

.tab-buttons button {
  flex: 1;
  padding: 0.75rem 1rem;
  border: none;
  background: transparent;
  color: #fff;
  cursor: pointer;
  font-weight: 600;
  border-radius: 8px;
  transition: all 0.3s ease;
  font-size: 0.95rem;
}

.tab-buttons button:hover {
  color: #fff;
  background: rgba(34, 197, 94, 0.2);
}

.active-tab {
  background: linear-gradient(135deg, #16a34a, #22c55e) !important;
  color: #fff !important;
  box-shadow: 0 4px 12px rgba(34, 197, 94, 0.4);
  transform: translateY(-1px);
}

.tab-content form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.input-group {
  position: relative;
}

.input-group label {
  display: block;
  color: #fff;
  font-weight: 500;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.tab-content input {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 2px solid #262626;
  border-radius: 12px;
  font-size: 1rem;
  transition: all 0.3s ease;
  background: #0f0f0f;
  color: #fff;
  box-sizing: border-box;
}

.tab-content input:focus {
  outline: none;
  border-color: #22c55e;
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.25);
  transform: translateY(-1px);
}

.tab-content input::placeholder {
  color: #a3a3a3;
}

.submit-btn {
  padding: 1rem;
  background: linear-gradient(135deg, #16a34a, #22c55e);
  color: #fff;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.3s ease;
  margin-top: 0.5rem;
  box-shadow: 0 4px 15px rgba(34, 197, 94, 0.4);
}

.submit-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(34, 197, 94, 0.6);
}

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

/* Mensajes flash */
.flash-messages {
  margin-bottom: 1.5rem;
}

.flash-message {
  padding: 1rem 1.25rem;
  border-radius: 12px;
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
  font-weight: 500;
  border: none;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  transition: all 0.3s ease;
}

.flash-error {
  background: linear-gradient(135deg, #ff6b6b, #ee5a52);
  color: #fff;
}

.flash-success {
  background: linear-gradient(135deg, #51cf66, #40c057);
  color: #fff;
}

/* Responsive design */
@media (max-width: 480px) {
  body {
    padding: 0.5rem;
  }
  
  .auth-panel {
    padding: 2rem 1.5rem;
    border-radius: 16px;
  }
  
  .auth-header h1 {
    font-size: 1.75rem;
  }
  
  .tab-content input {
    padding: 0.75rem;
  }
  
  .submit-btn {
    padding: 0.875rem;
  }
}