:root {
  --primary: #0078D4;
  --primary-hover: #106EBE;
  --secondary: #00B294;
  --accent: #00A4EF;
  --text-primary: #1A1A1A;
  --text-secondary: #666666;
  --background: #F5F5F5;
  --surface: #FFFFFF;
  --border: #E5E5E5;
  --error: #D13438;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
}

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

body.login-body {
  background: linear-gradient(135deg, #0078D4 0%, #00A4EF 50%, #00B294 100%);
  font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Roboto', sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 24px;
  position: relative;
  overflow: hidden;
}

body.login-body::before {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  top: -250px;
  right: -250px;
  animation: float 20s ease-in-out infinite;
}

body.login-body::after {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 50%;
  bottom: -200px;
  left: -200px;
  animation: float 15s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(50px, 50px) scale(1.1); }
}

.login-container {
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 48px 40px;
  width: 100%;
  max-width: 440px;
  position: relative;
  z-index: 1;
  border: 1px solid rgba(255, 255, 255, 0.2);
  animation: slideUp 0.6s ease-out;
}

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

.login-visual {
  text-align: center;
  margin-bottom: 40px;
}

.logo-circle {
  display: inline-flex;
  margin-bottom: 24px;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.login-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.login-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  font-weight: 500;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

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

.input-group label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-left: 4px;
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: 16px;
  color: var(--text-secondary);
  pointer-events: none;
  transition: color 0.3s;
}

.input-wrapper input {
  width: 100%;
  padding: 14px 16px 14px 48px;
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 15px;
  color: var(--text-primary);
  background: var(--surface);
  transition: all 0.3s;
  outline: none;
}

.input-wrapper input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(0, 120, 212, 0.1);
}

.input-wrapper input:focus + .input-icon,
.input-wrapper:focus-within .input-icon {
  color: var(--primary);
}

.input-wrapper input::placeholder {
  color: #999999;
}

.btn-submit {
  background: var(--primary);
  color: white;
  padding: 16px 24px;
  border: none;
  border-radius: var(--radius-md);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 8px;
  box-shadow: 0 4px 12px rgba(0, 120, 212, 0.3);
}

.btn-submit:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 120, 212, 0.4);
}

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

.btn-submit svg {
  transition: transform 0.3s;
}

.btn-submit:hover svg {
  transform: translateX(4px);
}

.error-msg {
  display: none;
  background: rgba(209, 52, 56, 0.1);
  color: var(--error);
  padding: 14px 16px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  margin-top: 16px;
  border: 1px solid rgba(209, 52, 56, 0.3);
  align-items: center;
  gap: 12px;
  animation: shake 0.5s;
}

.error-msg.show {
  display: flex;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-10px); }
  75% { transform: translateX(10px); }
}

.login-footer {
  text-align: center;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.3s;
}

.back-link:hover {
  color: var(--primary);
  gap: 12px;
}

.back-link svg {
  transition: transform 0.3s;
}

.back-link:hover svg {
  transform: translateX(-4px);
}

/* Responsive */
@media (max-width: 480px) {
  .login-container {
    padding: 40px 24px;
  }

  .login-title {
    font-size: 28px;
  }

  .login-subtitle {
    font-size: 14px;
  }

  .input-wrapper input {
    padding: 12px 16px 12px 44px;
    font-size: 14px;
  }

  .btn-submit {
    padding: 14px 20px;
    font-size: 15px;
  }
}

@media (max-width: 360px) {
  body.login-body {
    padding: 12px;
  }
  .login-container {
    padding: 24px 16px;
  }
  .login-title {
    font-size: 22px;
  }
  .input-wrapper input {
    padding: 10px 14px 10px 36px;
    font-size: 13px;
  }
  .btn-submit {
    padding: 12px 16px;
    font-size: 13px;
  }
}

/* Loading state */
.btn-submit.loading {
  pointer-events: none;
  opacity: 0.7;
}

.btn-submit.loading::after {
  content: '';
  width: 16px;
  height: 16px;
  border: 2px solid white;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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