/* CSS Custom Properties */
:root {
  /* Primary Colors */
  --primary-50: #fef2f4;
  --primary-100: #fce7ea;
  --primary-200: #f9d1d6;
  --primary-300: #f4a3b0;
  --primary-400: #ee758a;
  --primary-500: #e54666;
  --primary-600: #d63957;
  --primary-700: #b82a47;
  --primary-800: #9a2540;
  --primary-900: #82233c;

  /* Secondary Colors */
  --secondary-50: #f0f9ff;
  --secondary-100: #e0f2fe;
  --secondary-200: #bae6fd;
  --secondary-300: #7dd3fc;
  --secondary-400: #38bdf8;
  --secondary-500: #0ea5e9;
  --secondary-600: #0284c7;
  --secondary-700: #0369a1;
  --secondary-800: #075985;
  --secondary-900: #0c4a6e;

  /* Accent Colors */
  --accent-pink: #FF6B9D;
  --accent-purple: #8B5CF6;
  --accent-orange: #F97316;
  --accent-green: #10B981;

  /* Neutral Colors */
  --gray-50: #fafafa;
  --gray-100: #f4f4f5;
  --gray-200: #e4e4e7;
  --gray-300: #d4d4d8;
  --gray-400: #a1a1aa;
  --gray-500: #71717a;
  --gray-600: #52525b;
  --gray-700: #3f3f46;
  --gray-800: #27272a;
  --gray-900: #18181b;

  /* Semantic Colors */
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --info: #3b82f6;

  /* Typography */
  --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-family-handwriting: 'Caveat', cursive;

  /* Spacing (8px grid) */
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-5: 1.25rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  --spacing-10: 2.5rem;
  --spacing-12: 3rem;
  --spacing-16: 4rem;
  --spacing-20: 5rem;
  --spacing-24: 6rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 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);

  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
}

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

html {
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family-sans);
  font-weight: 400;
  color: var(--gray-900);
  background: linear-gradient(135deg, var(--primary-50) 0%, var(--secondary-50) 100%);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Loading Screen */
.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--accent-pink) 0%, var(--accent-purple) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  color: white;
}

.loading-content {
  text-align: center;
  animation: fadeInUp 0.6s ease-out;
}

.heart-loader {
  position: relative;
  width: 80px;
  height: 80px;
  margin: 0 auto var(--spacing-6);
}

.heart-pulse {
  position: absolute;
  width: 100%;
  height: 100%;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  animation: heartPulse 1.5s ease-in-out infinite;
}

.heart-icon {
  width: 40px;
  height: 40px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  animation: heartBeat 1s ease-in-out infinite alternate;
}

.loading-content h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-2);
}

.loading-content p {
  font-size: 1.1rem;
  opacity: 0.9;
}

/* Navigation */
.main-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--gray-200);
  z-index: var(--z-fixed);
  padding: var(--spacing-4) 0;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--accent-pink);
}

.logo {
  width: 32px;
  height: 32px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
}

.nav-btn {
  position: relative;
  background: none;
  border: none;
  padding: var(--spacing-2);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.nav-btn:hover {
  background: var(--gray-100);
}

.nav-btn svg {
  width: 24px;
  height: 24px;
  color: var(--gray-600);
}

.profile-avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  border: 2px solid var(--accent-pink);
}

.notification-badge {
  position: absolute;
  top: 0;
  right: 0;
  background: var(--error);
  color: white;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: var(--radius-full);
  min-width: 18px;
  text-align: center;
}

/* App Container */
.app-container {
  position: relative;
  min-height: 100vh;
  padding-top: 80px;
}

/* Screen Management */
.screen {
  display: none;
  width: 100%;
  min-height: calc(100vh - 80px);
}

.screen.active {
  display: block;
}

/* Welcome Screen */
.welcome-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-8);
}

.welcome-content {
  max-width: 400px;
  width: 100%;
}

.welcome-hero {
  position: relative;
  margin-bottom: var(--spacing-12);
}

.floating-hearts {
  position: absolute;
  top: -20px;
  left: 0;
  right: 0;
  pointer-events: none;
}

.floating-heart {
  position: absolute;
  width: 20px;
  height: 20px;
  background: var(--accent-pink);
  transform: rotate(45deg);
  animation: floatHeart 4s ease-in-out infinite;
  opacity: 0.7;
}

.floating-heart::before,
.floating-heart::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  background: var(--accent-pink);
  border-radius: 50%;
}

.floating-heart::before {
  top: -10px;
  left: 0;
}

.floating-heart::after {
  top: 0;
  left: -10px;
}

.floating-heart:nth-child(1) {
  left: 20%;
  animation-delay: 0s;
}

.floating-heart:nth-child(2) {
  left: 50%;
  animation-delay: 1s;
}

.floating-heart:nth-child(3) {
  left: 80%;
  animation-delay: 2s;
}

.welcome-hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-pink), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-4);
}

.welcome-hero p {
  font-size: 1.1rem;
  color: var(--gray-600);
  line-height: 1.6;
}

/* Auth Buttons */
.auth-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
}

.auth-divider {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
  margin: var(--spacing-6) 0;
  color: var(--gray-500);
  font-size: 0.9rem;
}

.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--gray-200);
}

.social-auth {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-4);
}

/* Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) var(--spacing-6);
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
  min-height: 48px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-pink), var(--accent-purple));
  color: white;
  box-shadow: var(--shadow-md);
}

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

.btn-secondary {
  background: white;
  color: var(--gray-700);
  border: 2px solid var(--gray-200);
}

.btn-secondary:hover {
  border-color: var(--accent-pink);
  color: var(--accent-pink);
}

.btn-social {
  background: white;
  border: 2px solid var(--gray-200);
  color: var(--gray-700);
  font-size: 0.9rem;
  padding: var(--spacing-3) var(--spacing-4);
}

.btn-social:hover {
  border-color: var(--gray-300);
  box-shadow: var(--shadow-sm);
}

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

/* Auth Screens */
.auth-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-8);
}

.auth-container {
  max-width: 400px;
  width: 100%;
  background: white;
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-8);
}

.auth-header {
  text-align: center;
  margin-bottom: var(--spacing-8);
  position: relative;
}

.back-btn {
  position: absolute;
  left: 0;
  top: 0;
  background: none;
  border: none;
  padding: var(--spacing-2);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.back-btn:hover {
  background: var(--gray-100);
}

.back-btn svg {
  width: 24px;
  height: 24px;
  color: var(--gray-600);
}

.auth-header h2 {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--spacing-2);
}

.auth-header p {
  color: var(--gray-600);
}

/* Form Styles */
.auth-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-6);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.form-group label {
  font-weight: 600;
  color: var(--gray-700);
  font-size: 0.9rem;
}

.form-group input,
.form-group textarea,
.form-group select {
  padding: var(--spacing-3) var(--spacing-4);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-lg);
  font-size: 1rem;
  transition: border-color var(--transition-fast);
  background: white;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent-pink);
  box-shadow: 0 0 0 3px rgba(255, 107, 157, 0.1);
}

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-3);
}

.checkbox-group input[type="checkbox"] {
  margin-top: 2px;
}

.checkbox-group label {
  font-size: 0.9rem;
  line-height: 1.5;
}

.auth-links {
  text-align: center;
  margin-top: var(--spacing-4);
}

.auth-links a {
  color: var(--accent-pink);
  text-decoration: none;
  font-weight: 600;
}

.auth-links a:hover {
  text-decoration: underline;
}

/* Dashboard Screen */
.dashboard-screen {
  padding: var(--spacing-8);
  max-width: 1200px;
  margin: 0 auto;
}

.dashboard-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-8);
}

.dashboard-header h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--gray-900);
}

.rooms-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-6);
  margin-bottom: var(--spacing-8);
}

/* Quick Actions */
.quick-actions {
  position: fixed;
  bottom: var(--spacing-6);
  right: var(--spacing-6);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
}

.quick-action-btn {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: var(--accent-pink);
  color: white;
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
}

.quick-action-btn:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-xl);
}

.quick-action-btn svg {
  width: 24px;
  height: 24px;
}

/* Utility Classes */
.hidden {
  display: none !important;
}

.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;
}

/* Responsive Design */
@media (max-width: 768px) {
  .welcome-hero h1 {
    font-size: 2rem;
  }
  
  .social-auth {
    grid-template-columns: 1fr;
  }
  
  .dashboard-screen {
    padding: var(--spacing-4);
  }
  
  .rooms-grid {
    grid-template-columns: 1fr;
  }
  
  .dashboard-header {
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-4);
  }
  
  .quick-actions {
    bottom: var(--spacing-4);
    right: var(--spacing-4);
  }
}

@media (max-width: 480px) {
  .auth-container {
    padding: var(--spacing-6);
  }
  
  .welcome-screen {
    padding: var(--spacing-4);
  }
}

/* High contrast mode */
@media (prefers-contrast: high) {
  :root {
    --gray-200: #000;
    --gray-600: #000;
  }
  
  .btn-secondary {
    border-color: #000;
    color: #000;
  }
}

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