/* 
  Login Page Styles - Modern design matching marketing theme
  Pure vanilla CSS - no frameworks or dependencies
*/

/* ============================================
   CSS Custom Properties (Theme Variables)
   ============================================ */
:root {
  /* Primary Blue Theme */
  --primary-blue: #2F5D8C;
  --primary-blue-hover: #0F5270;
  --primary-blue-light: #D4E5ED;
  --primary-blue-shadow: rgba(47, 93, 140, 0.1);
  --primary-blue-shadow-hover: rgba(47, 93, 140, 0.15);
  
  /* Gradients */
  --gradient-light-blue: linear-gradient(180deg, #E8F4F8 0%, #FFFFFF 100%);
  --gradient-blue: linear-gradient(135deg, #2F5D8C 0%, #0F5270 100%);
  
  /* Text Colors */
  --text-primary: #1a1a1a;
  --text-secondary: #666;
  --text-light: #999;
  --text-white: #FFFFFF;
  --text-error: #dc3545;
  
  /* Background Colors */
  --bg-white: #FFFFFF;
  --bg-light: #F8F9FA;
  --bg-light-blue: #E8F4F8;
  --bg-error: #fff5f5;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  /* Shadows */
  --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 10px 30px rgba(47, 93, 140, 0.15);
  --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.1);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.6s ease;
}

/* ============================================
   Reset & Base Styles
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text-primary);
  line-height: 1.6;
  background: var(--gradient-light-blue);
  overflow-x: hidden;
  min-height: 100vh;
}

/* ============================================
   Login Page Container
   ============================================ */
.login-page-container {
  min-height: 100vh;
  position: relative;
  display: flex;
  flex-direction: column;
  padding: var(--spacing-md);
}

.login-page-container::before {
  content: '';
  position: fixed;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(47, 93, 140, 0.1) 0%, transparent 70%);
  border-radius: 50%;
  z-index: 0;
  pointer-events: none;
}

.login-page-container::after {
  content: '';
  position: fixed;
  bottom: -30%;
  left: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(47, 93, 140, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  z-index: 0;
  pointer-events: none;
}

/* ============================================
   Return to Home Link
   ============================================ */
.return-home-container {
  position: relative;
  z-index: 10;
  margin-bottom: var(--spacing-md);
}

.return-home-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--primary-blue);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.875rem;
  transition: all var(--transition-base);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
}

.return-home-link:hover {
  color: var(--primary-blue-hover);
  background-color: var(--primary-blue-light);
}

.return-home-link svg {
  transition: transform var(--transition-base);
}

.return-home-link:hover svg {
  transform: translateX(-2px);
}

/* ============================================
   Main Content Area
   ============================================ */
.login-main {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
  position: relative;
  z-index: 1;
  padding: var(--spacing-md) 0;
}

/* ============================================
   Login Card
   ============================================ */
.login-card {
  background-color: var(--bg-white);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  width: 100%;
  max-width: 440px;
  box-shadow: var(--shadow-xl);
  border: 1px solid rgba(47, 93, 140, 0.1);
  position: relative;
  z-index: 1;
}

/* Animation */
.login-card.slide-up {
  transform: translateY(30px);
  opacity: 0;
  transition: all var(--transition-slow);
}

.login-card.slide-up.visible {
  transform: translateY(0);
  opacity: 1;
}

/* ============================================
   Login Header
   ============================================ */
.login-header {
  text-align: center;
  margin-bottom: var(--spacing-md);
}

.login-logo {
  margin-bottom: var(--spacing-md);
  display: flex;
  justify-content: center;
}

.logo-icon {
  height: 48px;
  width: auto;
}

.login-title {
  font-size: 2rem;
  font-weight: 700;
  margin: 0 0 var(--spacing-xs) 0;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.login-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.5;
}

/* ============================================
   Error Message
   ============================================ */
.error-message {
  background-color: var(--bg-error);
  color: var(--text-error);
  padding: var(--spacing-sm);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-md);
  border: 1px solid rgba(220, 53, 69, 0.2);
  display: none;
  transition: all var(--transition-base);
}

.error-message.visible {
  display: block;
  animation: slideDown 0.3s ease;
}

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

/* ============================================
   Login Form
   ============================================ */
.login-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.form-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
}

.form-input {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 2px solid #e0e0e0;
  border-radius: var(--radius-md);
  font-size: 1rem;
  color: var(--text-primary);
  background-color: var(--bg-white);
  transition: all var(--transition-base);
  font-family: inherit;
}

.form-input:focus {
  outline: none;
  border-color: var(--primary-blue);
  box-shadow: 0 0 0 4px var(--primary-blue-shadow);
  transform: translateY(-1px);
}

.form-input::placeholder {
  color: var(--text-light);
}

.form-input:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  background-color: var(--bg-light);
}

/* ============================================
   Checkbox Group
   ============================================ */
.checkbox-group {
  margin-top: calc(var(--spacing-xs) * -1);
}

.checkbox-label {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-xs);
  cursor: pointer;
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--text-secondary);
}

.checkbox-input {
  margin-top: 0.25rem;
  width: 18px;
  height: 18px;
  min-width: 18px;
  cursor: pointer;
  accent-color: var(--primary-blue);
  flex-shrink: 0;
}

.checkbox-text {
  flex: 1;
}

.terms-link {
  color: #0066cc;
  text-decoration: none;
  font-weight: 500;
  transition: all var(--transition-base);
}

.terms-link:hover {
  color: #0052a3;
  text-decoration: underline;
}

.terms-link:focus-visible {
  outline: 2px solid var(--primary-blue);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ============================================
   Submit Button
   ============================================ */
.btn-login {
  width: 100%;
  padding: 0.875rem 1.5rem;
  background: var(--gradient-blue);
  color: var(--text-white);
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  margin-top: var(--spacing-xs);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  position: relative;
}

.btn-login:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  background: linear-gradient(135deg, #0F5270 0%, #2F5D8C 100%);
}

.btn-login:active:not(:disabled) {
  transform: translateY(0);
}

.btn-login:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

.btn-loader {
  display: none;
  animation: spin 1s linear infinite;
}

.btn-loader svg {
  width: 20px;
  height: 20px;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

/* ============================================
   Login Footer
   ============================================ */
.login-footer {
  margin-top: var(--spacing-md);
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-secondary);
  padding-top: var(--spacing-md);
  border-top: 1px solid #e0e0e0;
}

.signup-prompt {
  color: var(--text-secondary);
}

.btn-link-signup {
  background: none;
  border: none;
  color: var(--primary-blue);
  font-size: 0.875rem;
  cursor: pointer;
  padding: 0;
  text-decoration: none;
  transition: all var(--transition-base);
  font-weight: 600;
  font-family: inherit;
}

.btn-link-signup:hover {
  color: var(--primary-blue-hover);
  text-decoration: underline;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
  .login-page-container {
    padding: var(--spacing-sm);
  }
  
  .login-card {
    padding: var(--spacing-md);
    max-width: 100%;
  }
  
  .login-title {
    font-size: 1.75rem;
  }
  
  .login-main {
    padding: var(--spacing-sm) 0;
  }
  
  .return-home-container {
    margin-bottom: var(--spacing-sm);
  }
}

@media (max-width: 480px) {
  .login-card {
    padding: var(--spacing-md) var(--spacing-sm);
    border-radius: var(--radius-lg);
  }
  
  .login-title {
    font-size: 1.5rem;
  }
  
  .form-input {
    padding: 0.75rem;
    font-size: 0.9375rem;
  }
  
  .btn-login {
    padding: 0.75rem 1.25rem;
    font-size: 0.9375rem;
  }
}

/* ============================================
   Accessibility
   ============================================ */
.error-message[aria-hidden="true"] {
  display: none;
}

.error-message[aria-hidden="false"] {
  display: block;
}

/* Focus visible for keyboard navigation */
.form-input:focus-visible,
.btn-login:focus-visible,
.btn-link-signup:focus-visible,
.return-home-link:focus-visible {
  outline: 2px solid var(--primary-blue);
  outline-offset: 2px;
}