/* ========================================
   HeartPing Design System
   Warm, Personal, Relationship-Focused
   ======================================== */

/* Design Tokens */
:root {
  /* Colors - Warm & Approachable Palette */
  --color-primary: #8B5CF6;
  --color-primary-light: #A78BFA;
  --color-primary-dark: #7C3AED;
  --color-secondary: #EC4899;
  --color-accent: #F97316;
  --color-accent-light: #FB923C;
  
  /* Semantic Colors */
  --color-love: #F43F5E;
  --color-family: #8B5CF6;
  --color-friends: #3B82F6;
  --color-professional: #10B981;
  
  /* Health Status */
  --color-healthy: #22C55E;
  --color-okay: #F59E0B;
  --color-needs-attention: #F97316;
  --color-overdue: #EF4444;
  
  /* Backgrounds */
  --color-bg-primary: #FAF5FF;
  --color-bg-secondary: #FFFFFF;
  --color-bg-tertiary: #F5F3FF;
  --color-bg-dark: #1E1B4B;
  
  /* Text */
  --color-text-primary: #1E1B4B;
  --color-text-secondary: #4C1D95;
  --color-text-muted: #6B7280;
  --color-text-inverse: #FFFFFF;
  
  /* Borders */
  --color-border: #DDD6FE;
  --color-border-light: #EDE9FE;
  
  /* Typography Scale */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  
  /* Spacing Scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  
  /* 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);
  --shadow-glow: 0 0 20px rgba(139, 92, 246, 0.3);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
  
  /* Z-Index Scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-tooltip: 1050;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--color-text-primary);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }

p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
}

/* Layout */
.container {
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.app-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.header {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: var(--color-text-inverse);
  padding: var(--space-4) var(--space-4) var(--space-8);
  position: relative;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-4);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
}

.logo-icon {
  font-size: var(--font-size-2xl);
  animation: heartbeat 2s infinite;
}

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

.header-actions {
  display: flex;
  gap: var(--space-2);
}

.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.15);
  border: none;
  color: var(--color-text-inverse);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-lg);
  transition: background var(--transition-fast);
}

.icon-btn:hover {
  background: rgba(255, 255, 255, 0.25);
}

/* Greeting */
.greeting {
  text-align: center;
  margin-bottom: var(--space-4);
}

.greeting-text {
  font-size: var(--font-size-lg);
  opacity: 0.9;
}

.greeting-name {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
}

/* Main Content */
.main-content {
  flex: 1;
  padding: var(--space-4);
  margin-top: -var(--space-4);
}

/* Cards */
.card {
  background: var(--color-bg-secondary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  padding: var(--space-4);
  margin-bottom: var(--space-4);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.card:hover {
  box-shadow: var(--shadow-lg);
}

/* Nudge Card - Special attention-grabbing style */
.nudge-card {
  background: linear-gradient(135deg, #FEF3C7 0%, #FDE68A 100%);
  border-left: 4px solid var(--color-accent);
  position: relative;
  overflow: hidden;
}

.nudge-card::before {
  content: '👋';
  position: absolute;
  right: -10px;
  top: -10px;
  font-size: 4rem;
  opacity: 0.1;
}

.nudge-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.nudge-avatar {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: var(--color-bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-2xl);
  box-shadow: var(--shadow-md);
}

.nudge-content h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-1);
}

.nudge-content p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin: 0;
}

.nudge-actions {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

/* Person Card */
.person-card {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-3);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid var(--color-border-light);
}

.person-card:hover {
  border-color: var(--color-primary-light);
  transform: translateX(4px);
}

.person-avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xl);
  flex-shrink: 0;
  position: relative;
}

.person-avatar.family { background: linear-gradient(135deg, #DDD6FE, #C4B5FD); }
.person-avatar.friends { background: linear-gradient(135deg, #BFDBFE, #93C5FD); }
.person-avatar.love { background: linear-gradient(135deg, #FECDD3, #FDA4AF); }
.person-avatar.professional { background: linear-gradient(135deg, #A7F3D0, #6EE7B7); }

.health-dot {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 14px;
  height: 14px;
  border-radius: var(--radius-full);
  border: 2px solid var(--color-bg-secondary);
}

.health-dot.healthy { background: var(--color-healthy); }
.health-dot.okay { background: var(--color-okay); }
.health-dot.needs-attention { background: var(--color-needs-attention); }
.health-dot.overdue { background: var(--color-overdue); }

.person-info {
  flex: 1;
  min-width: 0;
}

.person-name {
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-1);
}

.person-status {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.person-action {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: var(--color-bg-tertiary);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-base);
  transition: all var(--transition-fast);
}

.person-action:hover {
  background: var(--color-primary-light);
  color: white;
}

/* Connection Health Overview */
.health-overview {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.health-stat {
  text-align: center;
  padding: var(--space-3);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.health-stat-value {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
}

.health-stat-value.healthy { color: var(--color-healthy); }
.health-stat-value.okay { color: var(--color-okay); }
.health-stat-value.needs-attention { color: var(--color-needs-attention); }
.health-stat-value.overdue { color: var(--color-overdue); }

.health-stat-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
}

.badge-family { background: #EDE9FE; color: #5B21B6; }
.badge-friends { background: #DBEAFE; color: #1D4ED8; }
.badge-love { background: #FCE7F3; color: #BE185D; }
.badge-professional { background: #D1FAE5; color: #047857; }
.badge-birthday { background: #FEF3C7; color: #B45309; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  box-shadow: var(--shadow-glow);
}

.btn-secondary {
  background: var(--color-bg-tertiary);
  color: var(--color-primary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-bg-primary);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
}

.btn-ghost:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-primary);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
}

.btn-block {
  width: 100%;
}

/* Section Headers */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-3);
}

.section-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
}

.section-link {
  font-size: var(--font-size-sm);
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
}

/* Upcoming Events */
.event-card {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-3);
  border: 1px solid var(--color-border-light);
}

.event-date {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--color-secondary), var(--color-love));
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: white;
  flex-shrink: 0;
}

.event-date-day {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  line-height: 1;
}

.event-date-month {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
}

.event-info {
  flex: 1;
}

.event-title {
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-1);
}

.event-person {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* Quick Actions Grid */
.quick-actions {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.quick-action {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
}

.quick-action:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.quick-action-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--color-bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-lg);
}

.quick-action-label {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-align: center;
}

/* Bottom Navigation */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border-light);
  padding: var(--space-2) 0;
  padding-bottom: max(var(--space-2), env(safe-area-inset-bottom));
  z-index: var(--z-fixed);
}

.nav-container {
  max-width: 480px;
  margin: 0 auto;
  display: flex;
  justify-content: space-around;
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: color var(--transition-fast);
  background: none;
  border: none;
}

.nav-item:hover,
.nav-item.active {
  color: var(--color-primary);
}

.nav-icon {
  font-size: var(--font-size-xl);
}

.nav-label {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
}

/* FAB Button */
.fab {
  position: fixed;
  bottom: 80px;
  right: var(--space-4);
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: var(--color-text-inverse);
  border: none;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-2xl);
  transition: all var(--transition-fast);
  z-index: var(--z-fixed);
}

.fab:hover {
  transform: scale(1.1) rotate(90deg);
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: var(--z-modal);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--color-bg-secondary);
  border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(100%);
  transition: transform var(--transition-slow);
}

.modal-overlay.active .modal {
  transform: translateY(0);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-border-light);
  position: sticky;
  top: 0;
  background: var(--color-bg-secondary);
}

.modal-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
}

.modal-close {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--color-bg-tertiary);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
}

.modal-body {
  padding: var(--space-4);
}

/* Form Elements */
.form-group {
  margin-bottom: var(--space-4);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  transition: all var(--transition-fast);
  background: var(--color-bg-secondary);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

/* Frequency Selector */
.frequency-options {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-2);
}

.frequency-option {
  padding: var(--space-3);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  background: none;
}

.frequency-option:hover,
.frequency-option.active {
  border-color: var(--color-primary);
  background: var(--color-bg-tertiary);
}

.frequency-option.active {
  background: var(--color-primary);
  color: white;
}

.frequency-value {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  display: block;
}

.frequency-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.frequency-option.active .frequency-label {
  color: rgba(255, 255, 255, 0.8);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: var(--space-4);
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-tooltip);
}

.toast {
  background: var(--color-bg-dark);
  color: var(--color-text-inverse);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  animation: toast-in 0.3s ease;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--space-12) var(--space-4);
}

.empty-state-icon {
  font-size: 4rem;
  margin-bottom: var(--space-4);
}

.empty-state-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-2);
}

.empty-state-text {
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

/* Utility Classes */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.text-center { text-align: center; }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mt-4 { margin-top: var(--space-4); }

/* Responsive */
@media (max-width: 360px) {
  .quick-actions {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .health-overview {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Safe area for notched devices */
@supports (padding: max(0px)) {
  .main-content {
    padding-bottom: calc(80px + env(safe-area-inset-bottom));
  }
}