:root {
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --bg: #f8fafc;
  --card: #ffffff;
  --input-bg: #ffffff;
  --text: #1e293b;
  --muted: #64748b;
  --border: #e2e8f0;
  --danger: #ef4444;
  --success: #22c55e;
  --accent-bg: #eef2ff;
  --accent-text: #4338ca;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --bg: #0f172a;
    --card: #1e293b;
    --input-bg: #1e293b;
    --text: #f1f5f9;
    --muted: #94a3b8;
    --border: #334155;
    --accent-bg: #312e81;
    --accent-text: #c7d2fe;
    color-scheme: dark;
  }
}

:root[data-theme='dark'] {
  --bg: #0f172a;
  --card: #1e293b;
  --input-bg: #1e293b;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --border: #334155;
  --accent-bg: #312e81;
  --accent-text: #c7d2fe;
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-tap-highlight-color: transparent;
}

input, select, button, textarea { font-family: inherit; font-size: 1rem; color: var(--text); }

.material-symbols-outlined {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  vertical-align: middle;
  line-height: 1;
}

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

.app-content {
  flex: 1;
  padding: 16px 16px 96px;
  max-width: 560px;
  width: 100%;
  margin: 0 auto;
}

.page-loading {
  padding: 40px;
  text-align: center;
  color: var(--muted);
}

/* Bottom nav */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  align-items: center;
  justify-items: center;
  background: var(--card);
  border-top: 1px solid var(--border);
  padding: 6px 8px calc(6px + env(safe-area-inset-bottom));
  z-index: 20;
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  font-size: 0.7rem;
  color: var(--muted);
  text-decoration: none;
  padding: 6px 4px;
  border-radius: 12px;
  width: 100%;
}

.nav-item.active {
  color: var(--primary);
  font-weight: 600;
}

.nav-icon { font-size: 1.4rem; }

.fab {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.4);
  margin-top: -28px;
  line-height: 1;
}

.fab .material-symbols-outlined { font-size: 30px; }

.top-settings-btn {
  position: fixed;
  top: calc(12px + env(safe-area-inset-top));
  right: 12px;
  z-index: 15;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--card);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
  text-decoration: none;
}
.top-settings-btn.active { color: var(--primary); }

/* Auth pages */
.auth-page {
  max-width: 400px;
  margin: 40px auto;
  padding: 24px;
  text-align: center;
  position: relative;
}

.back-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 12px;
}

.auth-subtitle { color: var(--muted); margin-bottom: 24px; }

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.auth-form input, .auth-form select {
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--input-bg);
  width: 100%;
  box-sizing: border-box;
}

.password-field { position: relative; }
.password-field input { width: 100%; padding-right: 44px; }
.password-toggle {
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
}

.btn-primary {
  background: var(--primary);
  color: white;
  border: none;
  padding: 14px;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.btn-primary:disabled { opacity: 0.6; }

.btn-secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 10px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.btn-full { width: 100%; display: block; }
.btn-center { width: fit-content; margin: 16px auto 0; }

.theme-toggle { display: flex; gap: 8px; }
.theme-toggle .tab { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 4px; }

.form-error { color: var(--danger); font-size: 0.9rem; }

.tabs { display: flex; gap: 8px; margin-bottom: 16px; justify-content: center; }
.tab {
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--card);
  cursor: pointer;
}
.tab.active { background: var(--primary); color: white; border-color: var(--primary); }

/* Cards */
.card {
  background: var(--card);
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.settlement-tile { text-align: center; }
.settlement-tile .amount { font-size: 2rem; font-weight: 700; margin: 8px 0; }
.settlement-tile .amount.settled { color: var(--success); }
.settlement-tile .amount.owed { color: var(--danger); }
.settlement-transactions { display: flex; flex-direction: column; gap: 4px; }
.settlement-transactions .amount { font-size: 1.3rem; margin: 0; }
.suggestion-btn {
  background: none;
  border: none;
  font-family: inherit;
  cursor: pointer;
  border-radius: 8px;
  padding: 4px 8px;
}
.suggestion-btn:hover, .suggestion-btn:focus-visible { background: var(--accent-bg); }

.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
  gap: 8px;
  text-align: center;
}
.summary-grid .label { font-size: 0.75rem; color: var(--muted); }
.summary-grid .value { font-size: 1.1rem; font-weight: 600; }

/* Add expense form */
.expense-form { display: flex; flex-direction: column; gap: 16px; }
.amount-input {
  font-size: 2.5rem;
  text-align: center;
  border: none;
  border-bottom: 2px solid var(--border);
  padding: 12px;
  background: transparent;
  width: 100%;
}
.amount-input:focus { outline: none; border-color: var(--primary); }

.field { display: flex; flex-direction: column; gap: 6px; }
.field + .field { margin-top: 16px; }
.field label { font-size: 0.85rem; color: var(--muted); font-weight: 600; }
.field input, .field select, .field textarea {
  width: 100%;
  box-sizing: border-box;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--input-bg);
  color: var(--text);
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}
.category-chip {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 10px 4px;
  border-radius: 12px;
  border: 2px solid transparent;
  background: var(--bg);
  cursor: pointer;
  font-size: 0.7rem;
}
.category-chip.selected { border-color: var(--primary); background: var(--accent-bg); color: var(--accent-text); }
.category-chip .icon { font-size: 1.4rem; }

.toggle-row { display: flex; flex-wrap: wrap; gap: 10px; }
.toggle-row .toggle-btn { min-width: 100px; }
.toggle-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 14px;
  border-radius: 12px;
  border: 2px solid var(--border);
  background: var(--card);
  color: var(--text);
  cursor: pointer;
  font-weight: 600;
}
.toggle-btn.selected { border-color: var(--primary); background: var(--accent-bg); color: var(--accent-text); }

.split-options { display: flex; flex-direction: column; gap: 8px; }
.split-option {
  padding: 12px;
  border-radius: 12px;
  border: 2px solid var(--border);
  cursor: pointer;
}
.split-option.selected { border-color: var(--primary); background: var(--accent-bg); color: var(--accent-text); }
.exact-shares { display: flex; flex-direction: column; gap: 10px; margin-top: 8px; }
.exact-shares .field { flex: 1; }

.split-slider {
  width: 100%;
  height: 8px;
  border-radius: 999px;
  background: var(--border);
  appearance: none;
  -webkit-appearance: none;
  outline: none;
  margin: 8px 0 4px;
}
.split-slider::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--primary);
  border: 3px solid var(--card);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
  cursor: pointer;
}
.split-slider::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--primary);
  border: 3px solid var(--card);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
  cursor: pointer;
}
.split-slider-amounts { display: flex; gap: 10px; }
.split-slider-amounts .field { flex: 1; }

/* History */
.filters { display: flex; flex-direction: column; gap: 10px; margin-bottom: 16px; }
.filters select, .filters input {
  width: 100%;
  box-sizing: border-box;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--input-bg);
  color: var(--text);
}

.expense-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  background: var(--card);
  border-radius: 12px;
  margin-bottom: 8px;
  cursor: pointer;
}
.expense-item .cat-icon {
  width: 40px; height: 40px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}
.expense-item .details { flex: 1; min-width: 0; }
.expense-item .title { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.expense-item .meta {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.8rem;
  color: var(--muted);
}
.expense-item .meta .material-symbols-outlined { font-size: 1rem; }
.expense-item .amount-col { text-align: right; }
.expense-item .amount { font-weight: 700; }
.expense-item .share { font-size: 0.75rem; color: var(--muted); }

.settlement-item { cursor: pointer; background: var(--accent-bg); }
.settlement-item .settlement-icon { background: transparent; color: var(--accent-text); }
.settlement-item .title { color: var(--accent-text); }

.empty-state { text-align: center; color: var(--muted); padding: 40px 20px; }

/* Settings */
.member-row { display: flex; align-items: center; gap: 10px; padding: 10px 0; }

.household-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}
.household-row:last-of-type { border-bottom: none; }
.household-row-main { display: flex; flex-direction: column; gap: 2px; }
.badge-active {
  background: var(--accent-bg);
  color: var(--accent-text);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
}
.section-divider { border: none; border-top: 1px solid var(--border); margin: 16px 0; }
.category-manage-row { display: flex; align-items: center; gap: 10px; padding: 8px 0; border-bottom: 1px solid var(--border); }
.category-manage-row-main { display: flex; align-items: center; gap: 10px; flex: 1; min-width: 0; cursor: pointer; background: none; border: none; padding: 0; text-align: left; color: inherit; font: inherit; }
.category-manage-row-main.editing { color: var(--primary); font-weight: 600; }
.category-manage-row .icon { font-size: 1.3rem; }
.category-manage-row .name { flex: 1; }
.invite-code-row {
  display: flex;
  align-items: stretch;
  gap: 8px;
  margin: 8px 0;
}
.invite-code-input {
  flex: 1;
  min-width: 0;
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 3px;
  text-align: center;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--accent-bg);
  color: var(--accent-text);
}
.invite-link-input {
  flex: 1;
  min-width: 0;
  font-size: 0.85rem;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--input-bg);
  color: var(--text);
}
.invite-code-copy-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  cursor: pointer;
}
.invite-code-hint {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 4px;
}
.invite-code-hint.success { color: var(--success); }
.invite-code-hint.error { color: var(--danger); }

.switch-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0;
}
.switch-row .switch-label { display: flex; flex-direction: column; gap: 2px; }
.switch-desc {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0;
}
.switch-desc .material-symbols-outlined { font-size: 1.1rem; }

.switch {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 28px;
  flex-shrink: 0;
}
.switch input { opacity: 0; width: 0; height: 0; }
.switch-track {
  position: absolute;
  inset: 0;
  background: var(--border);
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.15s;
}
.switch-track::before {
  content: '';
  position: absolute;
  width: 22px;
  height: 22px;
  left: 3px;
  top: 3px;
  background: white;
  border-radius: 50%;
  transition: transform 0.15s;
}
.switch input:checked + .switch-track { background: var(--primary); }
.switch input:checked + .switch-track::before { transform: translateX(20px); }

.page-title { margin-top: 0; }

.offline-banner {
  background: #fef3c7;
  color: #92400e;
  text-align: center;
  padding: 8px;
  font-size: 0.85rem;
}
.offline-banner--syncing { background: #dbeafe; color: #1e40af; }

.install-banner {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--accent-bg);
  color: var(--accent-text);
  padding: 10px 12px;
  font-size: 0.85rem;
}
.install-banner-text { flex: 1; display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }
.install-banner-btn { padding: 8px 14px; white-space: nowrap; }
.inline-icon { font-size: 1rem; }

.modal-actions { display: flex; gap: 10px; }
.modal-actions button { flex: 1; }

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 30;
}
.modal-sheet {
  background: var(--card);
  width: 100%;
  max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
  border-radius: 20px 20px 0 0;
  padding: 20px;
}
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }

.confirm-sheet {
  max-width: 400px;
  border-radius: 20px;
  margin-bottom: 24px;
  text-align: center;
}
.confirm-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--accent-bg);
  color: var(--accent-text);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px;
}
.confirm-icon .material-symbols-outlined { font-size: 28px; }
.confirm-icon.danger { background: #fee2e2; color: var(--danger); }
:root[data-theme='dark'] .confirm-icon.danger { background: rgba(239, 68, 68, 0.18); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) .confirm-icon.danger { background: rgba(239, 68, 68, 0.18); }
}
.confirm-sheet h3 { margin: 0 0 8px; }
.confirm-message { color: var(--muted); margin: 0 0 20px; font-size: 0.9rem; }
.icon-btn { background: none; border: none; font-size: 1.4rem; cursor: pointer; }
.btn-danger {
  background: var(--danger);
  color: white;
  border: none;
  padding: 12px;
  border-radius: 10px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}