/* ============================================================
   SplitApp Design System
   A premium travel app design layer on top of Bootstrap 5
   ============================================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Primary: Coral-to-Rose */
  --sa-primary: #e8604c;
  --sa-primary-light: #ff7e6b;
  --sa-primary-dark: #c94535;
  --sa-primary-gradient: linear-gradient(135deg, #e8604c 0%, #d4456a 100%);

  /* Secondary: Ocean Teal */
  --sa-secondary: #1a9e8f;
  --sa-secondary-light: #2ec4b6;
  --sa-secondary-dark: #147a6e;
  --sa-secondary-gradient: linear-gradient(135deg, #1a9e8f 0%, #2176ae 100%);

  /* Accent: Golden Amber */
  --sa-accent: #f4a623;
  --sa-accent-light: #ffc857;
  --sa-accent-dark: #d48e15;

  /* Neutrals: Warm Grays */
  --sa-gray-50: #faf9f7;
  --sa-gray-100: #f3f1ed;
  --sa-gray-200: #e8e5df;
  --sa-gray-300: #d4d0c8;
  --sa-gray-400: #a8a29e;
  --sa-gray-500: #78716c;
  --sa-gray-600: #57534e;
  --sa-gray-700: #44403c;
  --sa-gray-800: #292524;
  --sa-gray-900: #1c1917;

  /* Semantic */
  --sa-success: #22c55e;
  --sa-success-light: #dcfce7;
  --sa-warning: #f59e0b;
  --sa-warning-light: #fef3c7;
  --sa-danger: #ef4444;
  --sa-danger-light: #fee2e2;
  --sa-info: #3b82f6;
  --sa-info-light: #dbeafe;

  /* Spacing (4px base) */
  --sa-space-1: 4px;
  --sa-space-2: 8px;
  --sa-space-3: 12px;
  --sa-space-4: 16px;
  --sa-space-5: 20px;
  --sa-space-6: 24px;
  --sa-space-8: 32px;
  --sa-space-10: 40px;
  --sa-space-12: 48px;
  --sa-space-16: 64px;

  /* Border Radius */
  --sa-radius-sm: 6px;
  --sa-radius-md: 12px;
  --sa-radius-lg: 16px;
  --sa-radius-xl: 24px;
  --sa-radius-full: 9999px;

  /* Shadows (warm-tinted) */
  --sa-shadow-sm: 0 1px 3px rgba(28, 25, 23, 0.06), 0 1px 2px rgba(28, 25, 23, 0.04);
  --sa-shadow-md: 0 4px 12px rgba(28, 25, 23, 0.08), 0 2px 4px rgba(28, 25, 23, 0.04);
  --sa-shadow-lg: 0 12px 32px rgba(28, 25, 23, 0.1), 0 4px 8px rgba(28, 25, 23, 0.06);
  --sa-shadow-xl: 0 20px 48px rgba(28, 25, 23, 0.14), 0 8px 16px rgba(28, 25, 23, 0.06);

  /* Transitions */
  --sa-transition-fast: 150ms ease;
  --sa-transition-normal: 250ms ease;
  --sa-transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Typography */
  --sa-font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --sa-font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

/* ---------- Base Overrides ---------- */
html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--sa-font-sans);
  background-color: var(--sa-gray-50);
  color: var(--sa-gray-800);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  margin-bottom: 0;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  color: var(--sa-gray-900);
  letter-spacing: -0.02em;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }

a {
  color: var(--sa-secondary);
  text-decoration: none;
  transition: color var(--sa-transition-fast);
}

a:hover {
  color: var(--sa-secondary-dark);
}

/* Focus rings */
:focus-visible {
  outline: 2px solid var(--sa-secondary);
  outline-offset: 2px;
  box-shadow: none;
}

.btn:focus-visible, .form-control:focus-visible, .form-select:focus-visible, .form-check-input:focus-visible {
  box-shadow: 0 0 0 3px rgba(26, 158, 143, 0.25);
  border-color: var(--sa-secondary);
}

/* ---------- Form Enhancements ---------- */
.form-control, .form-select {
  border-radius: var(--sa-radius-sm);
  border: 1.5px solid var(--sa-gray-200);
  padding: 10px 14px;
  font-size: 0.938rem;
  transition: border-color var(--sa-transition-fast), box-shadow var(--sa-transition-fast);
  background-color: #fff;
}

.form-control:focus, .form-select:focus {
  border-color: var(--sa-secondary);
  box-shadow: 0 0 0 3px rgba(26, 158, 143, 0.15);
}

.form-label {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--sa-gray-600);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 6px;
}

.form-check-input:checked {
  background-color: var(--sa-secondary);
  border-color: var(--sa-secondary);
}

/* ---------- sa-card ---------- */
.sa-card {
  background: #fff;
  border-radius: var(--sa-radius-md);
  box-shadow: var(--sa-shadow-sm);
  border: 1px solid var(--sa-gray-100);
  overflow: hidden;
  transition: transform var(--sa-transition-normal), box-shadow var(--sa-transition-normal);
}

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

.sa-card-static {
  background: #fff;
  border-radius: var(--sa-radius-md);
  box-shadow: var(--sa-shadow-sm);
  border: 1px solid var(--sa-gray-100);
  overflow: hidden;
}

.sa-card-body {
  padding: var(--sa-space-6);
}

.sa-card-header {
  padding: var(--sa-space-5) var(--sa-space-6);
  border-bottom: 1px solid var(--sa-gray-100);
  font-weight: 600;
}

.sa-card-footer {
  padding: var(--sa-space-4) var(--sa-space-6);
  border-top: 1px solid var(--sa-gray-100);
  background: var(--sa-gray-50);
}

.sa-card-accent {
  border-top: 3px solid;
}

.sa-card-accent-primary {
  border-top-color: var(--sa-primary);
}

.sa-card-accent-secondary {
  border-top-color: var(--sa-secondary);
}

.sa-card-accent-accent {
  border-top-color: var(--sa-accent);
}

.sa-card-accent-danger {
  border-top-color: var(--sa-danger);
}

/* Colored gradient strip on top */
.sa-card-gradient-strip {
  height: 4px;
  background: var(--sa-primary-gradient);
}

.sa-card-gradient-strip-teal {
  background: var(--sa-secondary-gradient);
}

.sa-card-gradient-strip-amber {
  background: linear-gradient(135deg, var(--sa-accent) 0%, var(--sa-primary) 100%);
}

/* ---------- Buttons ---------- */
.sa-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-weight: 600;
  font-size: 0.938rem;
  border-radius: var(--sa-radius-sm);
  border: none;
  cursor: pointer;
  transition: all var(--sa-transition-fast);
  text-decoration: none;
  line-height: 1.4;
}

.sa-btn:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

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

.sa-btn-primary {
  background: var(--sa-primary-gradient);
  color: #fff;
  box-shadow: 0 2px 8px rgba(232, 96, 76, 0.3);
}

.sa-btn-primary:hover {
  box-shadow: 0 4px 16px rgba(232, 96, 76, 0.4);
  color: #fff;
}

.sa-btn-secondary {
  background: var(--sa-secondary-gradient);
  color: #fff;
  box-shadow: 0 2px 8px rgba(26, 158, 143, 0.3);
}

.sa-btn-secondary:hover {
  box-shadow: 0 4px 16px rgba(26, 158, 143, 0.4);
  color: #fff;
}

.sa-btn-accent {
  background: linear-gradient(135deg, var(--sa-accent) 0%, var(--sa-accent-dark) 100%);
  color: #fff;
  box-shadow: 0 2px 8px rgba(244, 166, 35, 0.3);
}

.sa-btn-ghost {
  background: transparent;
  color: var(--sa-gray-700);
  border: 1.5px solid var(--sa-gray-300);
}

.sa-btn-ghost:hover {
  background: var(--sa-gray-100);
  color: var(--sa-gray-900);
  border-color: var(--sa-gray-400);
}

.sa-btn-danger {
  background: linear-gradient(135deg, var(--sa-danger) 0%, #dc2626 100%);
  color: #fff;
}

.sa-btn-success {
  background: linear-gradient(135deg, var(--sa-success) 0%, #16a34a 100%);
  color: #fff;
}

.sa-btn-sm {
  padding: 6px 14px;
  font-size: 0.813rem;
}

.sa-btn-lg {
  padding: 14px 28px;
  font-size: 1.063rem;
}

.sa-btn-pill {
  border-radius: var(--sa-radius-full);
}

.sa-btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--sa-radius-full);
  font-size: 1.1rem;
}

.sa-btn-icon.sa-btn-sm {
  width: 32px;
  height: 32px;
  font-size: 0.9rem;
}

/* Loading state */
.sa-btn-loading {
  position: relative;
  pointer-events: none;
  opacity: 0.75;
}

.sa-btn-loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: 50%;
  animation: sa-spin 0.6s linear infinite;
}

/* ---------- Badges ---------- */
.sa-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--sa-radius-full);
  letter-spacing: 0.02em;
}

.sa-badge-primary { background: rgba(232, 96, 76, 0.12); color: var(--sa-primary-dark); }
.sa-badge-secondary { background: rgba(26, 158, 143, 0.12); color: var(--sa-secondary-dark); }
.sa-badge-accent { background: rgba(244, 166, 35, 0.12); color: var(--sa-accent-dark); }
.sa-badge-success { background: var(--sa-success-light); color: #15803d; }
.sa-badge-warning { background: var(--sa-warning-light); color: #92400e; }
.sa-badge-danger { background: var(--sa-danger-light); color: #dc2626; }
.sa-badge-info { background: var(--sa-info-light); color: #1d4ed8; }
.sa-badge-neutral { background: var(--sa-gray-100); color: var(--sa-gray-600); }

.sa-badge-solid-success { background: var(--sa-success); color: #fff; }
.sa-badge-solid-warning { background: var(--sa-warning); color: #fff; }
.sa-badge-solid-danger { background: var(--sa-danger); color: #fff; }
.sa-badge-solid-info { background: var(--sa-info); color: #fff; }
.sa-badge-solid-secondary { background: var(--sa-secondary); color: #fff; }
.sa-badge-solid-neutral { background: var(--sa-gray-400); color: #fff; }

/* ---------- Progress Bar ---------- */
.sa-progress {
  height: 10px;
  background: var(--sa-gray-100);
  border-radius: var(--sa-radius-full);
  overflow: hidden;
}

.sa-progress-bar {
  height: 100%;
  border-radius: var(--sa-radius-full);
  transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
  background: var(--sa-secondary-gradient);
}

.sa-progress-bar-success { background: linear-gradient(90deg, #22c55e 0%, #16a34a 100%); }
.sa-progress-bar-warning { background: linear-gradient(90deg, #f59e0b 0%, #d97706 100%); }
.sa-progress-bar-danger { background: linear-gradient(90deg, #ef4444 0%, #dc2626 100%); }
.sa-progress-bar-primary { background: var(--sa-primary-gradient); }

.sa-progress-lg {
  height: 16px;
}

.sa-progress-sm {
  height: 6px;
}

/* ---------- Avatar ---------- */
.sa-avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  font-weight: 700;
  font-size: 0.875rem;
  color: #fff;
  text-transform: uppercase;
  flex-shrink: 0;
  border: 2px solid #fff;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.sa-avatar-sm { width: 32px; height: 32px; font-size: 0.75rem; }
.sa-avatar-lg { width: 52px; height: 52px; font-size: 1.1rem; }
.sa-avatar-xl { width: 64px; height: 64px; font-size: 1.3rem; }

/* Avatar color palette */
.sa-avatar-1 { background: #e8604c; }
.sa-avatar-2 { background: #1a9e8f; }
.sa-avatar-3 { background: #6366f1; }
.sa-avatar-4 { background: #f59e0b; }
.sa-avatar-5 { background: #ec4899; }
.sa-avatar-6 { background: #14b8a6; }
.sa-avatar-7 { background: #8b5cf6; }
.sa-avatar-8 { background: #f97316; }

/* Avatar stack (overlapping) */
.sa-avatar-stack {
  display: flex;
}

.sa-avatar-stack .sa-avatar {
  margin-left: -10px;
}

.sa-avatar-stack .sa-avatar:first-child {
  margin-left: 0;
}

.sa-avatar-overflow {
  background: var(--sa-gray-200);
  color: var(--sa-gray-600);
  font-size: 0.7rem;
}

/* ---------- Stats ---------- */
.sa-stat {
  text-align: center;
  padding: var(--sa-space-5);
}

.sa-stat-value {
  font-size: 1.75rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--sa-gray-900);
  letter-spacing: -0.03em;
}

.sa-stat-label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--sa-gray-500);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 4px;
}

.sa-stat-icon {
  font-size: 1.5rem;
  margin-bottom: 8px;
  opacity: 0.8;
}

/* ---------- Empty State ---------- */
.sa-empty {
  text-align: center;
  padding: var(--sa-space-16) var(--sa-space-6);
}

.sa-empty-icon {
  font-size: 3.5rem;
  color: var(--sa-gray-300);
  margin-bottom: var(--sa-space-4);
}

.sa-empty-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--sa-gray-700);
  margin-bottom: var(--sa-space-2);
}

.sa-empty-text {
  font-size: 0.938rem;
  color: var(--sa-gray-500);
  margin-bottom: var(--sa-space-6);
  max-width: 360px;
  margin-left: auto;
  margin-right: auto;
}

/* ---------- Gradient Header ---------- */
.sa-gradient-header {
  background: var(--sa-secondary-gradient);
  color: #fff;
  padding: var(--sa-space-8) 0;
  margin: -1rem calc(-1 * (50vw - 50%)) var(--sa-space-8);
  padding-left: calc(50vw - 50%);
  padding-right: calc(50vw - 50%);
}

.sa-gradient-header-coral {
  background: var(--sa-primary-gradient);
}

.sa-gradient-header h1,
.sa-gradient-header h2,
.sa-gradient-header h3 {
  color: #fff;
}

.sa-gradient-header .sa-badge {
  background: rgba(255,255,255,0.2);
  color: #fff;
}

.sa-gradient-header .text-muted {
  color: rgba(255,255,255,0.8) !important;
}

/* ---------- Navigation Card ---------- */
.sa-nav-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: var(--sa-space-5) var(--sa-space-4);
  background: #fff;
  border-radius: var(--sa-radius-md);
  box-shadow: var(--sa-shadow-sm);
  border: 1px solid var(--sa-gray-100);
  text-decoration: none;
  color: var(--sa-gray-700);
  transition: all var(--sa-transition-normal);
  text-align: center;
}

.sa-nav-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--sa-shadow-md);
  color: var(--sa-gray-900);
  text-decoration: none;
}

.sa-nav-card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--sa-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}

.sa-nav-card-label {
  font-weight: 600;
  font-size: 0.875rem;
}

.sa-nav-card-count {
  font-size: 0.75rem;
  color: var(--sa-gray-500);
}

/* Nav card icon themes */
.sa-nav-icon-expenses { background: rgba(232, 96, 76, 0.1); color: var(--sa-primary); }
.sa-nav-icon-members { background: rgba(99, 102, 241, 0.1); color: #6366f1; }
.sa-nav-icon-budget { background: rgba(34, 197, 94, 0.1); color: var(--sa-success); }
.sa-nav-icon-wishlist { background: rgba(244, 166, 35, 0.1); color: var(--sa-accent); }
.sa-nav-icon-polls { background: rgba(59, 130, 246, 0.1); color: var(--sa-info); }
.sa-nav-icon-settlement { background: rgba(26, 158, 143, 0.1); color: var(--sa-secondary); }

/* ---------- Floating Action Button ---------- */
.sa-fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--sa-primary-gradient);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(232, 96, 76, 0.4);
  transition: all var(--sa-transition-normal);
  z-index: 1000;
  text-decoration: none;
}

.sa-fab:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 24px rgba(232, 96, 76, 0.5);
  color: #fff;
}

@media (min-width: 768px) {
  .sa-fab {
    display: none;
  }
}

/* ---------- Amount Display ---------- */
.sa-amount {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

.sa-amount-lg {
  font-size: 2rem;
  letter-spacing: -0.02em;
}

.sa-amount-positive { color: var(--sa-success); }
.sa-amount-negative { color: var(--sa-danger); }

/* ---------- Donut Chart (CSS) ---------- */
.sa-donut {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  margin: 0 auto;
}

.sa-donut-label {
  font-weight: 800;
  font-size: 1.1rem;
  z-index: 1;
}

/* ---------- Balance Bar ---------- */
.sa-balance-bar-container {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 28px;
}

.sa-balance-bar-track {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  height: 8px;
  background: var(--sa-gray-100);
  border-radius: var(--sa-radius-full);
}

.sa-balance-bar-fill {
  position: absolute;
  height: 100%;
  border-radius: var(--sa-radius-full);
  transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.sa-balance-bar-positive {
  right: 50%;
  left: auto;
  background: var(--sa-success);
}

.sa-balance-bar-negative {
  left: 50%;
  right: auto;
  background: var(--sa-danger);
}

.sa-balance-bar-center {
  position: absolute;
  width: 2px;
  height: 16px;
  background: var(--sa-gray-400);
  left: 50%;
  transform: translateX(-50%);
}

/* ---------- Settlement Flow Card ---------- */
.sa-settlement-card {
  display: flex;
  align-items: center;
  gap: var(--sa-space-4);
  padding: var(--sa-space-4) var(--sa-space-5);
  background: #fff;
  border-radius: var(--sa-radius-md);
  box-shadow: var(--sa-shadow-sm);
  border: 1px solid var(--sa-gray-100);
}

.sa-settlement-arrow {
  color: var(--sa-gray-400);
  font-size: 1.2rem;
  flex-shrink: 0;
}

.sa-settlement-amount {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--sa-gray-900);
  flex-shrink: 0;
}

/* Status dots */
.sa-status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.sa-status-dot-pending { background: var(--sa-gray-300); }
.sa-status-dot-active { background: var(--sa-success); }
.sa-status-dot-warning { background: var(--sa-warning); }
.sa-status-dot-pulse {
  animation: sa-pulse 2s ease-in-out infinite;
}

/* ---------- Toggle Switch ---------- */
.sa-toggle {
  position: relative;
  width: 44px;
  height: 24px;
  appearance: none;
  -webkit-appearance: none;
  background: var(--sa-gray-300);
  border-radius: var(--sa-radius-full);
  outline: none;
  cursor: pointer;
  transition: background var(--sa-transition-fast);
}

.sa-toggle:checked {
  background: var(--sa-secondary);
}

.sa-toggle::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
  transition: transform var(--sa-transition-fast);
}

.sa-toggle:checked::before {
  transform: translateX(20px);
}

/* ---------- Icon Picker ---------- */
.sa-icon-picker {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(48px, 1fr));
  gap: 8px;
}

.sa-icon-option {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--sa-gray-200);
  border-radius: var(--sa-radius-sm);
  cursor: pointer;
  transition: all var(--sa-transition-fast);
  font-size: 1.2rem;
  color: var(--sa-gray-600);
  background: #fff;
}

.sa-icon-option:hover {
  border-color: var(--sa-secondary-light);
  color: var(--sa-secondary);
}

.sa-icon-option.active,
.sa-icon-option input:checked + & {
  border-color: var(--sa-secondary);
  background: rgba(26, 158, 143, 0.08);
  color: var(--sa-secondary);
}

/* ---------- Toast ---------- */
.sa-toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.sa-toast {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  background: #fff;
  border-radius: var(--sa-radius-md);
  box-shadow: var(--sa-shadow-lg);
  border-left: 4px solid var(--sa-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  pointer-events: auto;
  animation: sa-slide-in-right 0.3s ease-out;
  max-width: 380px;
}

.sa-toast-success { border-left-color: var(--sa-success); }
.sa-toast-error { border-left-color: var(--sa-danger); }
.sa-toast-warning { border-left-color: var(--sa-warning); }

.sa-toast-dismiss {
  animation: sa-fade-out 0.3s ease-in forwards;
}

/* ---------- Expense List Item ---------- */
.sa-expense-item {
  display: flex;
  align-items: center;
  gap: var(--sa-space-4);
  padding: var(--sa-space-4) var(--sa-space-5);
  border-bottom: 1px solid var(--sa-gray-100);
  transition: background var(--sa-transition-fast);
}

.sa-expense-item:last-child {
  border-bottom: none;
}

.sa-expense-item:hover {
  background: var(--sa-gray-50);
}

.sa-expense-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--sa-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.sa-expense-details {
  flex: 1;
  min-width: 0;
}

.sa-expense-desc {
  font-weight: 600;
  font-size: 0.938rem;
  color: var(--sa-gray-800);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sa-expense-meta {
  font-size: 0.8rem;
  color: var(--sa-gray-500);
  margin-top: 2px;
}

.sa-expense-amount {
  font-weight: 700;
  font-size: 1rem;
  color: var(--sa-gray-900);
  text-align: right;
  flex-shrink: 0;
}

.sa-expense-actions {
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity var(--sa-transition-fast);
}

.sa-expense-item:hover .sa-expense-actions {
  opacity: 1;
}

/* ---------- Split Method Cards ---------- */
.sa-split-methods {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

@media (min-width: 576px) {
  .sa-split-methods {
    grid-template-columns: repeat(4, 1fr);
  }
}

.sa-split-option {
  position: relative;
  cursor: pointer;
}

.sa-split-option input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.sa-split-option-label {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: var(--sa-space-4) var(--sa-space-3);
  border: 2px solid var(--sa-gray-200);
  border-radius: var(--sa-radius-md);
  text-align: center;
  transition: all var(--sa-transition-fast);
  background: #fff;
}

.sa-split-option input:checked + .sa-split-option-label {
  border-color: var(--sa-secondary);
  background: rgba(26, 158, 143, 0.06);
  box-shadow: 0 0 0 1px var(--sa-secondary);
}

.sa-split-option-icon {
  font-size: 1.4rem;
  color: var(--sa-gray-500);
}

.sa-split-option input:checked + .sa-split-option-label .sa-split-option-icon {
  color: var(--sa-secondary);
}

.sa-split-option-text {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--sa-gray-600);
}

/* ---------- Poll Option Card ---------- */
.sa-poll-option {
  border: 2px solid var(--sa-gray-200);
  border-radius: var(--sa-radius-md);
  padding: var(--sa-space-4) var(--sa-space-5);
  margin-bottom: var(--sa-space-3);
  transition: all var(--sa-transition-fast);
  background: #fff;
}

.sa-poll-option-voted {
  border-color: var(--sa-secondary);
  background: rgba(26, 158, 143, 0.03);
}

.sa-poll-option-winner {
  border-color: var(--sa-accent);
  background: rgba(244, 166, 35, 0.05);
}

/* ---------- Wishlist Vote Button ---------- */
.sa-vote-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border: 1.5px solid var(--sa-gray-300);
  border-radius: var(--sa-radius-full);
  background: #fff;
  color: var(--sa-gray-600);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--sa-transition-fast);
}

.sa-vote-btn:hover {
  border-color: var(--sa-primary);
  color: var(--sa-primary);
}

.sa-vote-btn-active {
  border-color: var(--sa-primary);
  background: rgba(232, 96, 76, 0.08);
  color: var(--sa-primary);
}

/* ---------- Navbar ---------- */
.sa-navbar {
  position: sticky;
  top: 0;
  z-index: 1050;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  padding: 0 var(--sa-space-4);
}

.sa-navbar-brand {
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--sa-primary) !important;
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.sa-navbar-brand:hover {
  color: var(--sa-primary-dark) !important;
}

.sa-navbar .nav-link {
  font-weight: 500;
  color: var(--sa-gray-600) !important;
  padding: 8px 16px !important;
  border-radius: var(--sa-radius-sm);
  transition: all var(--sa-transition-fast);
}

.sa-navbar .nav-link:hover,
.sa-navbar .nav-link.active {
  color: var(--sa-gray-900) !important;
  background: var(--sa-gray-100);
}

.sa-nav-avatar-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px 4px 4px;
  background: var(--sa-gray-100);
  border-radius: var(--sa-radius-full);
  border: none;
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--sa-gray-700);
  transition: background var(--sa-transition-fast);
}

.sa-nav-avatar-btn:hover {
  background: var(--sa-gray-200);
}

.sa-navbar-auth-btns {
  display: flex;
  gap: 8px;
  align-items: center;
}

/* ---------- Footer ---------- */
.sa-footer {
  background: var(--sa-gray-800);
  color: var(--sa-gray-400);
  padding: var(--sa-space-6) 0;
  font-size: 0.85rem;
  margin-top: var(--sa-space-16);
}

.sa-footer a {
  color: var(--sa-gray-300);
}

.sa-footer a:hover {
  color: #fff;
}

/* ---------- Hero Section ---------- */
.sa-hero {
  text-align: center;
  padding: var(--sa-space-16) var(--sa-space-4);
  background: var(--sa-primary-gradient);
  color: #fff;
  margin: -1rem calc(-1 * (50vw - 50%)) var(--sa-space-12);
  padding-left: calc(50vw - 50%);
  padding-right: calc(50vw - 50%);
}

.sa-hero h1 {
  color: #fff;
  font-size: 2.75rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: var(--sa-space-4);
}

.sa-hero p {
  font-size: 1.2rem;
  opacity: 0.9;
  max-width: 540px;
  margin: 0 auto var(--sa-space-8);
}

.sa-hero-btns {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.sa-hero-btn-white {
  background: #fff;
  color: var(--sa-primary);
  font-weight: 700;
  padding: 12px 28px;
  border-radius: var(--sa-radius-full);
  border: none;
  font-size: 1rem;
  transition: all var(--sa-transition-fast);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.sa-hero-btn-white:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
  color: var(--sa-primary);
}

.sa-hero-btn-outline {
  background: transparent;
  color: #fff;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: var(--sa-radius-full);
  border: 2px solid rgba(255,255,255,0.4);
  font-size: 1rem;
  transition: all var(--sa-transition-fast);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.sa-hero-btn-outline:hover {
  background: rgba(255,255,255,0.15);
  border-color: rgba(255,255,255,0.7);
  color: #fff;
}

@media (max-width: 767px) {
  .sa-hero h1 { font-size: 2rem; }
  .sa-hero { padding-top: var(--sa-space-10); padding-bottom: var(--sa-space-10); }
}

/* ---------- Feature Cards ---------- */
.sa-feature-card {
  text-align: center;
  padding: var(--sa-space-8) var(--sa-space-6);
}

.sa-feature-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--sa-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin: 0 auto var(--sa-space-4);
}

.sa-feature-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: var(--sa-space-2);
}

.sa-feature-text {
  font-size: 0.938rem;
  color: var(--sa-gray-500);
  line-height: 1.6;
}

/* ---------- Step Flow ---------- */
.sa-steps {
  display: flex;
  gap: var(--sa-space-6);
  align-items: flex-start;
  justify-content: center;
  flex-wrap: wrap;
}

.sa-step {
  flex: 1;
  min-width: 200px;
  max-width: 280px;
  text-align: center;
}

.sa-step-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--sa-secondary-gradient);
  color: #fff;
  font-weight: 800;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--sa-space-4);
}

.sa-step-title {
  font-weight: 700;
  margin-bottom: var(--sa-space-2);
}

.sa-step-text {
  font-size: 0.875rem;
  color: var(--sa-gray-500);
}

/* ---------- Confirmation Card ---------- */
.sa-confirm-card {
  max-width: 480px;
  margin: var(--sa-space-8) auto;
}

.sa-confirm-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin: 0 auto var(--sa-space-4);
}

.sa-confirm-icon-danger {
  background: var(--sa-danger-light);
  color: var(--sa-danger);
}

.sa-confirm-icon-success {
  background: var(--sa-success-light);
  color: var(--sa-success);
}

.sa-confirm-icon-warning {
  background: var(--sa-warning-light);
  color: var(--sa-warning);
}

/* ---------- Big Amount Input ---------- */
.sa-amount-input {
  font-size: 2.5rem;
  font-weight: 800;
  text-align: center;
  border: none;
  border-bottom: 3px solid var(--sa-gray-200);
  border-radius: 0;
  padding: var(--sa-space-4);
  background: transparent;
  letter-spacing: -0.02em;
}

.sa-amount-input:focus {
  border-color: var(--sa-secondary);
  box-shadow: none;
  outline: none;
}

.sa-amount-input::placeholder {
  color: var(--sa-gray-300);
}

/* ---------- Language Pills ---------- */
.sa-lang-pills {
  display: flex;
  gap: 4px;
}

.sa-lang-pill {
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--sa-radius-full);
  border: 1.5px solid var(--sa-gray-200);
  background: transparent;
  color: var(--sa-gray-500);
  cursor: pointer;
  transition: all var(--sa-transition-fast);
  text-decoration: none;
  text-transform: uppercase;
}

.sa-lang-pill:hover,
.sa-lang-pill.active {
  border-color: var(--sa-secondary);
  color: var(--sa-secondary);
  background: rgba(26, 158, 143, 0.06);
}

/* ---------- Animations ---------- */
@keyframes sa-fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes sa-slide-up {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes sa-slide-in-right {
  from { opacity: 0; transform: translateX(100px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes sa-fade-out {
  from { opacity: 1; transform: translateX(0); }
  to { opacity: 0; transform: translateX(100px); }
}

@keyframes sa-scale-in {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

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

@keyframes sa-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes sa-bounce-in {
  0% { transform: scale(0); }
  50% { transform: scale(1.15); }
  100% { transform: scale(1); }
}

@keyframes sa-progress-fill {
  from { width: 0; }
}

.sa-animate-fade-in { animation: sa-fade-in 0.5s ease-out; }
.sa-animate-slide-up { animation: sa-slide-up 0.5s ease-out both; }
.sa-animate-scale-in { animation: sa-scale-in 0.4s ease-out both; }
.sa-animate-bounce-in { animation: sa-bounce-in 0.5s ease-out both; }

/* Stagger delays */
.sa-stagger-1 { animation-delay: 0.05s; }
.sa-stagger-2 { animation-delay: 0.1s; }
.sa-stagger-3 { animation-delay: 0.15s; }
.sa-stagger-4 { animation-delay: 0.2s; }
.sa-stagger-5 { animation-delay: 0.25s; }
.sa-stagger-6 { animation-delay: 0.3s; }

/* Scroll-triggered */
.sa-animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.sa-animate-on-scroll.sa-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Utility Classes ---------- */
.sa-text-gradient {
  background: var(--sa-primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.sa-text-primary { color: var(--sa-primary); }
.sa-text-secondary { color: var(--sa-secondary); }
.sa-text-accent { color: var(--sa-accent); }
.sa-text-muted { color: var(--sa-gray-500); }

.sa-bg-soft-primary { background: rgba(232, 96, 76, 0.08); }
.sa-bg-soft-secondary { background: rgba(26, 158, 143, 0.08); }
.sa-bg-soft-success { background: var(--sa-success-light); }
.sa-bg-soft-danger { background: var(--sa-danger-light); }
.sa-bg-soft-warning { background: var(--sa-warning-light); }

.sa-rounded { border-radius: var(--sa-radius-md); }
.sa-rounded-lg { border-radius: var(--sa-radius-lg); }

.sa-shadow { box-shadow: var(--sa-shadow-md); }
.sa-shadow-lg { box-shadow: var(--sa-shadow-lg); }

.sa-divider {
  height: 1px;
  background: var(--sa-gray-100);
  margin: var(--sa-space-4) 0;
}

.sa-truncate {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ---------- Category Colors ---------- */
.sa-category-food { background: #fee2e2; color: #dc2626; }
.sa-category-accommodation { background: #dbeafe; color: #2563eb; }
.sa-category-transport { background: #fef3c7; color: #d97706; }
.sa-category-activities { background: #dcfce7; color: #16a34a; }
.sa-category-shopping { background: #f3e8ff; color: #7c3aed; }
.sa-category-default { background: var(--sa-gray-100); color: var(--sa-gray-600); }

/* ---------- Responsive Helpers ---------- */
@media (max-width: 575px) {
  .sa-hide-mobile { display: none !important; }
  .sa-gradient-header {
    padding-top: var(--sa-space-6);
    padding-bottom: var(--sa-space-6);
  }
  h1 { font-size: 1.5rem; }
  .sa-stat-value { font-size: 1.4rem; }
}

@media (min-width: 576px) {
  .sa-hide-desktop { display: none !important; }
}

/* ---------- Dropdown override ---------- */
.dropdown-menu {
  border: 1px solid var(--sa-gray-100);
  border-radius: var(--sa-radius-md);
  box-shadow: var(--sa-shadow-lg);
  padding: 6px;
}

.dropdown-item {
  border-radius: var(--sa-radius-sm);
  padding: 8px 14px;
  font-size: 0.875rem;
  font-weight: 500;
  transition: background var(--sa-transition-fast);
}

.dropdown-item:hover {
  background: var(--sa-gray-100);
}

/* ---------- Table Override ---------- */
.sa-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
}

.sa-table thead th {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--sa-gray-500);
  border-bottom: 2px solid var(--sa-gray-100);
  padding: var(--sa-space-3) var(--sa-space-4);
}

.sa-table tbody td {
  padding: var(--sa-space-3) var(--sa-space-4);
  border-bottom: 1px solid var(--sa-gray-100);
  font-size: 0.938rem;
}

.sa-table tbody tr:hover {
  background: var(--sa-gray-50);
}

.sa-table tbody tr:last-child td {
  border-bottom: none;
}

/* ---------- Trip Card ---------- */
.sa-trip-card {
  overflow: hidden;
}

.sa-trip-card-gradient {
  height: 6px;
}

/* Generate variety with nth-child */
.sa-trip-card:nth-child(6n+1) .sa-trip-card-gradient { background: var(--sa-primary-gradient); }
.sa-trip-card:nth-child(6n+2) .sa-trip-card-gradient { background: var(--sa-secondary-gradient); }
.sa-trip-card:nth-child(6n+3) .sa-trip-card-gradient { background: linear-gradient(135deg, #6366f1, #8b5cf6); }
.sa-trip-card:nth-child(6n+4) .sa-trip-card-gradient { background: linear-gradient(135deg, var(--sa-accent), #f97316); }
.sa-trip-card:nth-child(6n+5) .sa-trip-card-gradient { background: linear-gradient(135deg, #ec4899, #f43f5e); }
.sa-trip-card:nth-child(6n+6) .sa-trip-card-gradient { background: linear-gradient(135deg, #14b8a6, #06b6d4); }

/* ---------- Invitation / Accept page ---------- */
.sa-invite-page {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sa-invite-card {
  max-width: 440px;
  width: 100%;
  text-align: center;
}

.sa-invite-icon {
  font-size: 3rem;
  margin-bottom: var(--sa-space-4);
}

/* Copy link input */
.sa-copy-group {
  display: flex;
  gap: 0;
}

.sa-copy-input {
  flex: 1;
  border-radius: var(--sa-radius-sm) 0 0 var(--sa-radius-sm);
  font-family: var(--sa-font-mono);
  font-size: 0.85rem;
}

.sa-copy-btn {
  border-radius: 0 var(--sa-radius-sm) var(--sa-radius-sm) 0;
  white-space: nowrap;
}

/* ---------- Participant Chip ---------- */
.sa-participant-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px 4px 4px;
  background: var(--sa-gray-100);
  border-radius: var(--sa-radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--sa-transition-fast);
  border: 2px solid transparent;
}

.sa-participant-chip.active {
  border-color: var(--sa-secondary);
  background: rgba(26, 158, 143, 0.08);
}

.sa-participant-chip:hover {
  background: var(--sa-gray-200);
}

/* ---------- Print ---------- */
@media print {
  .sa-navbar, .sa-footer, .sa-fab, .sa-toast-container { display: none !important; }
  .sa-card, .sa-card-static { box-shadow: none; border: 1px solid #ddd; }
  body { background: #fff; }
}