* { box-sizing: border-box; }

:root {
  --bg: var(--tg-theme-bg-color, #ffffff);
  --secondary-bg: var(--tg-theme-secondary-bg-color, #f2f2f7);
  --text: var(--tg-theme-text-color, #1c1c1e);
  --hint: var(--tg-theme-hint-color, #8e8e93);
  --link: var(--tg-theme-link-color, #2481cc);
  --button: var(--tg-theme-button-color, #2481cc);
  --button-text: var(--tg-theme-button-text-color, #ffffff);
  --border: rgba(120, 120, 128, 0.2);
  --danger: #ff3b30;
  --success: #34c759;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-tap-highlight-color: transparent;
}

#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding-bottom: 64px;
}

.header {
  padding: 14px 16px 10px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 5;
}

.header h1 {
  font-size: 18px;
  margin: 0 0 2px;
}

.header .sub {
  font-size: 13px;
  color: var(--hint);
}

.month-picker {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 10px 16px;
}

.month-picker button {
  background: none;
  border: none;
  color: var(--link);
  font-size: 20px;
  padding: 4px 10px;
  cursor: pointer;
}

.month-picker .label {
  font-weight: 600;
  min-width: 140px;
  text-align: center;
}

.content {
  flex: 1;
  padding: 4px 12px 16px;
}

.card {
  background: var(--secondary-bg);
  border-radius: 14px;
  padding: 12px 14px;
  margin-bottom: 10px;
}

.expense-card {
  display: flex;
  gap: 10px;
  align-items: center;
  cursor: pointer;
}

.expense-thumb {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  object-fit: cover;
  flex-shrink: 0;
  background: var(--border);
}

.expense-thumb.placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

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

.expense-title {
  font-weight: 600;
  font-size: 15px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.expense-meta {
  font-size: 12.5px;
  color: var(--hint);
  margin-top: 2px;
}

.expense-amount {
  font-weight: 700;
  font-size: 15px;
  white-space: nowrap;
}

.badge {
  display: inline-block;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 20px;
  background: rgba(36, 129, 204, 0.12);
  color: var(--link);
  margin-right: 6px;
}

.empty-state {
  text-align: center;
  color: var(--hint);
  padding: 40px 20px;
  font-size: 14px;
}

.tabbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  background: var(--bg);
  border-top: 1px solid var(--border);
  padding-bottom: env(safe-area-inset-bottom);
  z-index: 10;
}

.tabbar button {
  flex: 1;
  background: none;
  border: none;
  padding: 8px 0 6px;
  font-size: 11px;
  color: var(--hint);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  cursor: pointer;
}

.tabbar button .icon { font-size: 20px; }

.tabbar button.active { color: var(--link); }

.fab {
  position: fixed;
  right: 18px;
  bottom: 78px;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: var(--button);
  color: var(--button-text);
  border: none;
  font-size: 26px;
  box-shadow: 0 4px 14px rgba(0,0,0,0.25);
  cursor: pointer;
  z-index: 8;
}

.btn {
  display: inline-block;
  background: var(--button);
  color: var(--button-text);
  border: none;
  border-radius: 12px;
  padding: 12px 18px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
  text-align: center;
}

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

.btn.danger {
  background: var(--danger);
  color: #fff;
}

.btn.small {
  width: auto;
  padding: 8px 14px;
  font-size: 13px;
  border-radius: 10px;
}

.field {
  margin-bottom: 14px;
}

.field label {
  display: block;
  font-size: 13px;
  color: var(--hint);
  margin-bottom: 6px;
}

.field input[type=text],
.field input[type=number],
.field input[type=date],
.field select,
.field textarea {
  width: 100%;
  padding: 11px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  padding: 8px 12px;
  border-radius: 20px;
  background: var(--secondary-bg);
  border: 1px solid var(--border);
  font-size: 13.5px;
  cursor: pointer;
  user-select: none;
}

.chip.selected {
  background: var(--button);
  color: var(--button-text);
  border-color: var(--button);
}

.split-toggle {
  display: flex;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.split-toggle div {
  flex: 1;
  text-align: center;
  padding: 9px 0;
  font-size: 13.5px;
  cursor: pointer;
}

.split-toggle div.active {
  background: var(--button);
  color: var(--button-text);
}

.custom-share-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.custom-share-row .name { flex: 1; font-size: 14px; }
.custom-share-row input { width: 100px; }

.sheet-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  z-index: 20;
  display: flex;
  align-items: flex-end;
}

.sheet {
  background: var(--bg);
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  border-radius: 18px 18px 0 0;
  padding: 16px 16px calc(20px + env(safe-area-inset-bottom));
}

.sheet-handle {
  width: 36px;
  height: 4px;
  background: var(--border);
  border-radius: 4px;
  margin: 0 auto 14px;
}

.sheet-title {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 14px;
}

.hint-text {
  font-size: 12.5px;
  color: var(--hint);
  margin-top: 4px;
}

.error-text {
  font-size: 13px;
  color: var(--danger);
  margin-top: 6px;
}

.debt-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.debt-row .who {
  font-size: 14.5px;
}

.balance-row {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 14.5px;
}

.balance-row:last-child { border-bottom: none; }

.positive { color: var(--success); font-weight: 600; }
.negative { color: var(--danger); font-weight: 600; }

.section-title {
  font-size: 13px;
  text-transform: uppercase;
  color: var(--hint);
  margin: 18px 4px 8px;
  letter-spacing: 0.4px;
}

.top-actions {
  display: flex;
  justify-content: flex-end;
  padding: 8px 4px 0;
}

.photo-preview {
  width: 100%;
  max-height: 160px;
  object-fit: cover;
  border-radius: 10px;
  margin-top: 8px;
  display: none;
}

.loading {
  text-align: center;
  padding: 30px;
  color: var(--hint);
}

.chart-wrap {
  background: var(--secondary-bg);
  border-radius: 14px;
  padding: 14px;
  margin-bottom: 10px;
}

.total-line {
  text-align: center;
  font-size: 22px;
  font-weight: 700;
  margin: 6px 0 14px;
}