/* ============================================================
   ORGSIGHTAI LOGIN PAGE CSS
   Modern, clean design system aligned with client portal
   ============================================================ */

/* ============================================================
   1) DESIGN TOKENS & RESET
   ============================================================ */
:root {
  /* Colors - OrgSightAI Brand */
  --clr-primary: #4f46e5;
  --clr-primary-hover: #4338ca;
  --clr-primary-light: #eef2ff;
  --clr-primary-50: #f5f3ff;
  
  --clr-gray-900: #111827;
  --clr-gray-800: #1f2937;
  --clr-gray-700: #374151;
  --clr-gray-600: #4b5563;
  --clr-gray-500: #6b7280;
  --clr-gray-400: #9ca3af;
  --clr-gray-300: #d1d5db;
  --clr-gray-200: #e5e7eb;
  --clr-gray-100: #f3f4f6;
  --clr-gray-50: #f9fafb;
  
  --clr-white: #ffffff;
  --clr-black: #000000;
  
  --clr-success: #059669;
  --clr-success-light: #ecfdf5;
  --clr-warning: #d97706;
  --clr-warning-light: #fffbeb;
  --clr-danger: #dc2626;
  --clr-danger-light: #fef2f2;
  
  /* Typography */
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 0.75rem;
  --space-lg: 1rem;
  --space-xl: 1.25rem;
  --space-2xl: 1.5rem;
  --space-3xl: 2rem;
  --space-4xl: 2.5rem;
  --space-5xl: 3rem;
  
  /* Border radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 200ms ease;
  --transition-slow: 300ms ease;
}

/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  line-height: 1.6;
  color: var(--clr-gray-800);
  background-color: var(--clr-gray-50);
  font-weight: var(--font-weight-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

/* ============================================================
   2) LAYOUT SYSTEM
   ============================================================ */
.auth-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl);
  position: relative;
  overflow: hidden;
}

/* Background Elements */
.auth-content {
  width: 100%;
  max-width: 600px;
  z-index: 1;
}

/* ============================================================
   3) HEADER & BRANDING
   ============================================================ */
.auth-header {
  text-align: center;
  margin-bottom: var(--space-4xl);
}

.brand-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.brand-logo {
  width: 36px;
  height: 36px;
  stroke: var(--clr-primary);
  stroke-width: 2;
  fill: none;
  filter: drop-shadow(0 2px 4px rgba(79, 70, 229, 0.2));
}

.brand-logo circle {
  fill: var(--clr-primary);
}

.brand-title {
  font-size: 2rem;
  font-weight: var(--font-weight-extrabold);
  color: var(--clr-gray-900);
  margin: 0;
}

.brand-ai {
  color: var(--clr-primary);
}

.brand-tagline {
  color: var(--clr-gray-600);
  font-size: 1rem;
  font-weight: var(--font-weight-medium);
  margin: 0;
}

/* ============================================================
   4) AUTHENTICATION CARD
   ============================================================ */
.auth-card {
  background: var(--clr-white);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--clr-gray-200);
  overflow: hidden;
  position: relative;
}

.auth-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(79, 70, 229, 0.3), transparent);
}

/* ============================================================
   5) TAB SYSTEM
   ============================================================ */
.auth-tabs {
  display: flex;
  background: var(--clr-gray-50);
  border-bottom: 1px solid var(--clr-gray-200);
}

.auth-tab {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-xl);
  background: none;
  border: none;
  font-size: 1rem;
  font-weight: var(--font-weight-semibold);
  color: var(--clr-gray-600);
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
}

.auth-tab:hover {
  color: var(--clr-gray-900);
  background: var(--clr-white);
}

.auth-tab.active {
  color: var(--clr-primary);
  background: var(--clr-white);
  border-bottom: 2px solid var(--clr-primary);
}

.tab-icon {
  width: 20px;
  height: 20px;
  opacity: 0.7;
  transition: var(--transition-fast);
}

.tab-icon svg {
  width: 100%;
  height: 100%;
}

.auth-tab.active .tab-icon {
  opacity: 1;
}

/* ============================================================
   6) FORM SYSTEM
   ============================================================ */
.auth-form-container {
  display: none;
  padding: var(--space-4xl) var(--space-3xl);
}

.auth-form-container.active {
  display: block;
  animation: fadeInUp 0.3s ease;
}

.form-header {
  text-align: center;
  margin-bottom: var(--space-4xl);
}

.form-title {
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  color: var(--clr-gray-900);
  margin-bottom: var(--space-sm);
}

.form-subtitle {
  color: var(--clr-gray-600);
  font-size: 1rem;
  margin: 0;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
}

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

.form-label {
  font-size: 0.875rem;
  font-weight: var(--font-weight-semibold);
  color: var(--clr-gray-700);
}

.form-input {
  padding: var(--space-lg) var(--space-xl);
  border: 1px solid var(--clr-gray-300);
  border-radius: var(--radius-lg);
  font-size: 1rem;
  color: var(--clr-gray-900);
  background: var(--clr-white);
  transition: all var(--transition-fast);
  font-family: inherit;
}

.form-input:focus {
  outline: none;
  border-color: var(--clr-primary);
  box-shadow: 0 0 0 3px var(--clr-primary-light);
  transform: translateY(-1px);
}

.form-input::placeholder {
  color: var(--clr-gray-400);
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  margin: calc(var(--space-lg) * -1) 0 0 0;
}

.forgot-password-link {
  color: var(--clr-primary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: var(--font-weight-medium);
  transition: var(--transition-fast);
}

.forgot-password-link:hover {
  color: var(--clr-primary-hover);
  text-decoration: underline;
}

/* ============================================================
   7) BUTTON SYSTEM
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-lg) var(--space-2xl);
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: inherit;
  position: relative;
  overflow: hidden;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

.btn-primary {
  background: linear-gradient(135deg, var(--clr-primary) 0%, var(--clr-primary-hover) 100%);
  color: var(--clr-white);
  border-color: var(--clr-primary);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--clr-primary-hover) 0%, #3730a3 100%);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: var(--shadow-md);
}

.btn-full {
  width: 100%;
}

/* ============================================================
   8) FOOTER
   ============================================================ */
.auth-footer {
  padding: var(--space-2xl) var(--space-3xl);
  border-top: 1px solid var(--clr-gray-200);
  background: var(--clr-gray-50);
  text-align: center;
}

.copyright {
  color: var(--clr-gray-500);
  font-size: 0.875rem;
  margin: 0;
}

/* ============================================================
   9) ANIMATIONS
   ============================================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes shimmer {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(100%);
  }
}

/* ============================================================
   10) RESPONSIVE DESIGN
   ============================================================ */
@media (min-width: 640px) {
  .form-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .auth-container {
    padding: var(--space-2xl);
  }
  
  .auth-content {
    max-width: 640px;
  }
}

@media (min-width: 768px) {
  .brand-title {
    font-size: 2.25rem;
  }
  
  .brand-logo {
    width: 40px;
    height: 40px;
  }
  
  .brand-tagline {
    font-size: 1.125rem;
  }
  
  .form-title {
    font-size: 1.75rem;
  }
  
  .form-subtitle {
    font-size: 1.125rem;
  }
  
  .auth-content {
    max-width: 680px;
  }
}

@media (max-width: 480px) {
  .auth-container {
    padding: var(--space-lg);
  }
  
  .auth-content {
    max-width: 100%;
  }
  
  .auth-form-container {
    padding: var(--space-3xl) var(--space-2xl);
  }
  
  .brand-title {
    font-size: 1.75rem;
  }
  
  .brand-logo {
    width: 32px;
    height: 32px;
  }
  
  .tab-text {
    display: none;
  }
  
  .auth-tab {
    padding: var(--space-lg);
  }
  
  .form-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 360px) {
  .auth-form-container {
    padding: var(--space-2xl) var(--space-xl);
  }
  
  .auth-header {
    margin-bottom: var(--space-3xl);
  }
  
  .form-header {
    margin-bottom: var(--space-3xl);
  }
}

/* ============================================================
   11) FOCUS & ACCESSIBILITY
   ============================================================ */
.auth-tab:focus,
.btn:focus,
.form-input:focus,
.forgot-password-link:focus {
  outline: 2px solid var(--clr-primary);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .auth-card {
    background: var(--clr-white);
    border: 2px solid var(--clr-gray-900);
  }
  
  .background-overlay {
    background: rgba(0, 0, 0, 0.8);
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================================
   12) PRINT STYLES
   ============================================================ */
@media print {
  .auth-container {
    background: var(--clr-white);
  }
  
  .background-pattern,
  .background-overlay {
    display: none;
  }
  
  .auth-card {
    background: var(--clr-white);
    box-shadow: none;
    border: 1px solid var(--clr-gray-300);
  }
}

/* ============================================================
   13) UTILITY CLASSES
   ============================================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.hidden {
  display: none !important;
}

/* ============================================================
   14) LOADING STATES
   ============================================================ */
.loading {
  position: relative;
  color: transparent !important;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 16px;
  height: 16px;
  margin: -8px 0 0 -8px;
  border: 2px solid currentColor;
  border-top: 2px solid transparent;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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