/* Modern CSS Reset and Base Styles */
:root {
  --primary-color: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #3b82f6;
  --secondary-color: #64748b;
  --success-color: #10b981;
  --error-color: #ef4444;
  --warning-color: #f59e0b;
  
  --background-color: #f8fafc;
  --surface-color: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  
  --border-color: #e2e8f0;
  --border-radius: 12px;
  --border-radius-lg: 16px;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  
  --transition: all 0.2s ease-in-out;
  --transition-slow: all 0.3s ease-in-out;
}

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

html {
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--background-color);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Auth Page Layout */
.public-page.auth-page {
  padding: var(--spacing-md);
  min-height: 100vh;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  position: relative;
}

.public-page.auth-page::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><polygon fill="%23ffffff" fill-opacity="0.05" points="0,1000 1000,0 1000,1000"/></svg>');
  background-size: cover;
}

.auth-page-container {
  width: 100%;
  max-width: 440px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

/* Auth Card */
.auth-card {
  background: var(--surface-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-2xl);
  box-shadow: var(--shadow-xl);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: var(--transition-slow);
}

.auth-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl), 0 25px 50px -12px rgb(0 0 0 / 0.25);
}

/* App Branding */
.app-name {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  text-align: center;
  color: var(--primary-color);
  margin-bottom: var(--spacing-lg);
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.app-logo {
  margin-bottom: var(--spacing-xl);
}

.app-logo img {
  max-width: 80px;
  height: auto;
  border-radius: 12px;
  transition: var(--transition);
}

.app-logo img:hover {
  transform: scale(1.05);
}

/* Page Title */
.page-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--spacing-xl);
  color: var(--text-primary);
  position: relative;
}

.page-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
  border-radius: 2px;
}

/* Form Styles */
.form-group {
  margin-bottom: var(--spacing-lg);
  position: relative;
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  transition: var(--transition);
}

.form-group:focus-within label {
  color: var(--primary-color);
}

.form-group input {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: var(--font-size-base);
  transition: var(--transition);
  background-color: var(--surface-color);
  color: var(--text-primary);
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgb(37 99 235 / 0.1);
  transform: translateY(-1px);
}

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

.form-group input:invalid:not(:focus):not(:placeholder-shown) {
  border-color: var(--error-color);
}

/* Button Styles */
.button-group {
  margin-top: var(--spacing-xl);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md) var(--spacing-xl);
  border: none;
  border-radius: var(--border-radius);
  font-size: var(--font-size-base);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  color: white;
  width: 100%;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

.btn-primary::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: left 0.5s;
}

.btn-primary:hover::before {
  left: 100%;
}

/* Error Message Styles - ADDED */
.error-message {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(239, 68, 68, 0.05));
  border: 1px solid var(--error-color);
  color: var(--error-color);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-lg);
  font-size: var(--font-size-sm);
  text-align: center;
  display: none;
  animation: slideDown 0.3s ease-out;
  position: relative;
  overflow: hidden;
}

.error-message:before {
  content: "⚠️";
  margin-right: var(--spacing-sm);
  font-size: var(--font-size-lg);
}

.error-message.show {
  display: block;
}

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

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

.error-message.shake {
  animation: shake 0.5s ease-in-out;
}

/* Form error states */
.form-group.has-error input {
  border-color: var(--error-color);
  box-shadow: 0 0 0 3px rgb(239 68 68 / 0.1);
}

.form-group.has-error label {
  color: var(--error-color);
}

.form-group.has-error::after {
  content: "⚠";
  position: absolute;
  right: var(--spacing-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--error-color);
  font-size: var(--font-size-lg);
}

/* Language Switcher */
.lang-switch {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
}

.lang-switch button {
  background: none;
  border: 1px solid var(--border-color);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.lang-switch button:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
  transform: translateY(-1px);
}

.lang-switch button[data-lang-switch="ar"] {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* RTL Support */
[dir="rtl"] .page-title::after,
[dir="rtl"] .lang-switch {
  direction: rtl;
}

[dir="rtl"] .form-group input {
  text-align: right;
}

[dir="rtl"] .error-message:before {
  margin-right: 0;
  margin-left: var(--spacing-sm);
}

[dir="rtl"] .form-group.has-error::after {
  right: auto;
  left: var(--spacing-md);
}

/* Responsive Design */
@media (max-width: 480px) {
  .auth-card {
    padding: var(--spacing-xl);
    margin: 0 var(--spacing-sm);
  }
  
  .public-page.auth-page {
    padding: var(--spacing-sm);
  }
  
  .app-name {
    font-size: var(--font-size-xl);
  }
  
  .page-title {
    font-size: var(--font-size-xl);
  }
  
  .error-message {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
  }
}

@media (max-width: 360px) {
  .auth-card {
    padding: var(--spacing-lg);
  }
  
  .form-group input {
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .btn {
    padding: var(--spacing-sm) var(--spacing-lg);
  }
  
  .error-message {
    padding: var(--spacing-xs) var(--spacing-sm);
  }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --background-color: #0f172a;
    --surface-color: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    --border-color: #334155;
  }
  
  .public-page.auth-page {
    background: linear-gradient(135deg, #4c51bf 0%, #2d3748 100%);
  }
  
  .error-message {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.15), rgba(239, 68, 68, 0.08));
    border-color: rgba(239, 68, 68, 0.3);
  }
}

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

.btn.loading::after {
  content: '';
  width: 16px;
  height: 16px;
  border: 2px solid transparent;
  border-top: 2px solid currentColor;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-left: 8px;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Focus styles for accessibility */
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

.error-message:focus-visible {
  outline: 2px solid var(--error-color);
  outline-offset: 2px;
}