* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Roboto', sans-serif;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  transition: background 0.5s ease;
  animation: gradientShift 15s ease infinite;
  background-size: 400% 400%;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.login-container {
  width: 100%;
  max-width: 420px;
  padding: 25px;
  perspective: 1000px;
}

.login-box {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 35px;
  border-radius: 16px;
  box-shadow: 0 8px 32px rgba(31, 38, 135, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.18);
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275), 
              box-shadow 0.6s ease;
  animation: floatIn 0.8s ease-out forwards;
}

.login-box:hover {
  box-shadow: 0 15px 35px rgba(31, 38, 135, 0.25);
  transform: translateY(-5px);
}

@keyframes floatIn {
  0% {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

h2 {
  text-align: center;
  color: #333;
  margin-bottom: 30px;
  font-weight: 500;
  position: relative;
  padding-bottom: 10px;
}

h2::after {
  content: '';
  position: absolute;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, #667eea, #764ba2);
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  border-radius: 10px;
}

/* Tab styles */
.login-tabs {
  display: flex;
  margin-bottom: 30px;
  border-radius: 8px;
  overflow: hidden;
  background: rgba(240, 240, 240, 0.5);
  position: relative;
  z-index: 1;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.tab-btn {
  flex: 1;
  background: none;
  border: none;
  padding: 14px;
  font-size: 15px;
  cursor: pointer;
  opacity: 0.7;
  transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
  color: #555;
  position: relative;
  overflow: hidden;
}

.tab-btn::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #667eea, #764ba2);
  transition: all 0.3s ease;
  transform: translateX(-50%);
}

.tab-btn:hover {
  opacity: 0.9;
}

.tab-btn.active {
  opacity: 1;
  color: #667eea;
  font-weight: 500;
}

.tab-btn.active::before {
  width: 80%;
}

.login-form {
  display: none;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.4s ease;
}

.login-form.active {
  display: block;
  animation: fadeIn 0.5s forwards;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.input-field {
  position: relative;
  margin-bottom: 28px;
}

.input-field input {
  width: 100%;
  padding: 16px;
  border: 1px solid rgba(221, 221, 221, 0.8);
  border-radius: 8px;
  outline: none;
  font-size: 16px;
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  background: rgba(255, 255, 255, 0.8);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.03);
}

.input-field label {
  position: absolute;
  top: 16px;
  left: 16px;
  color: #999;
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.input-field input:focus,
.input-field input:valid {
  border-color: #667eea;
  box-shadow: 0 2px 10px rgba(102, 126, 234, 0.15);
  background: rgba(255, 255, 255, 0.95);
}

.input-field input:focus + label,
.input-field input:valid + label {
  top: -10px;
  left: 10px;
  font-size: 13px;
  background: linear-gradient(90deg, #667eea, #764ba2);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  padding: 0 5px;
  font-weight: 500;
}

.password-toggle {
  position: absolute;
  right: 16px;
  top: 16px;
  background: linear-gradient(90deg, #667eea, #764ba2);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  cursor: pointer;
  font-size: 14px;
  user-select: none;
  transition: all 0.3s ease;
}

.password-toggle:hover {
  opacity: 0.8;
}

.remember-forgot {
  display: flex;
  justify-content: space-between;
  margin-bottom: 28px;
  font-size: 14px;
}

.remember-forgot label {
  display: flex;
  align-items: center;
  color: #555;
  transition: color 0.3s ease;
}

.remember-forgot label:hover {
  color: #667eea;
}

.remember-forgot input {
  margin-right: 8px;
  accent-color: #667eea;
}

.remember-forgot a {
  color: #667eea;
  text-decoration: none;
  transition: all 0.3s ease;
  position: relative;
}

.remember-forgot a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 1px;
  bottom: -2px;
  left: 0;
  background: linear-gradient(90deg, #667eea, #764ba2);
  transition: width 0.3s ease;
}

.remember-forgot a:hover::after {
  width: 100%;
}

button {
  width: 100%;
  height: 50px;
  border: none;
  outline: none;
  background: linear-gradient(90deg, #667eea, #764ba2);
  border-radius: 8px;
  color: white;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
  position: relative;
  overflow: hidden;
}

button::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: all 0.5s ease;
}

button:hover {
  transform: translateY(-2px);
  box-shadow: 0 7px 20px rgba(102, 126, 234, 0.4);
}

button:hover::before {
  left: 100%;
}

button:active {
  transform: translateY(1px);
  box-shadow: 0 2px 10px rgba(102, 126, 234, 0.3);
}

.error-message {
  color: #e74c3c;
  font-size: 14px;
  text-align: center;
  margin-top: 15px;
  min-height: 20px;
  transform: translateY(-5px);
  opacity: 0;
  transition: all 0.3s ease;
}

.error-message.show {
  transform: translateY(0);
  opacity: 1;
}

.signup-link {
  margin-top: 25px;
  text-align: center;
  font-size: 14px;
  color: #555;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.signup-icon {
  width: 18px;
  height: 18px;
  margin-right: 8px;
  vertical-align: middle;
  filter: drop-shadow(0 2px 3px rgba(0, 0, 0, 0.1));
  transition: transform 0.3s ease;
}

.signup-link:hover .signup-icon {
  transform: scale(1.1) rotate(5deg);
}

.signup-link a {
  background: linear-gradient(90deg, #667eea, #764ba2);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  text-decoration: none;
  font-weight: 500;
  position: relative;
  padding: 0 2px;
}

.signup-link a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 1px;
  bottom: -2px;
  left: 0;
  background: linear-gradient(90deg, #667eea, #764ba2);
  transition: width 0.3s ease;
}

.signup-link a:hover::after {
  width: 100%;
}

.admin-info {
  margin-top: 20px;
  font-size: 14px;
  color: #666;
  text-align: center;
  line-height: 1.5;
  padding: 10px;
  border-radius: 8px;
  background: rgba(240, 240, 240, 0.5);
}

#adminLoginForm button {
  margin-top: 20px;
}

/* Loading Screen Styles */
.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.95), rgba(118, 75, 162, 0.95));
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  transition: all 0.5s cubic-bezier(0.25, 0.8, 0.25, 1);
  backdrop-filter: blur(5px);
}

.spinner {
  width: 70px;
  height: 70px;
  margin-bottom: 25px;
  border: 5px solid rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  border-top-color: #fff;
  animation: spin 1s cubic-bezier(0.68, -0.55, 0.27, 1.55) infinite;
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
}

.loading-text {
  color: white;
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 1px;
  animation: pulse 1.5s ease-in-out infinite;
}

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

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

/* Responsive adjustments */
@media (max-width: 480px) {
  .login-container {
    padding: 15px;
  }
  
  .login-box {
    padding: 25px;
  }
  
  .input-field input {
    padding: 14px;
  }
  
  button {
    height: 45px;
  }
}