:root {
  --bg: #F5F5F7;
  --card: #FFFFFF;
  --text: #1C1C1E;
  --secondary: #8E8E93;
  --border: #E5E5EA;
  --primary: #007AFF;
  --income: #34C759;
  --expense: #FF3B30;
  --warning-bg: #FFF0F0;
  --warning-text: #C62828;
  --danger: #FF3B30;
  --shadow: 0 2px 12px rgba(0,0,0,0.06);
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  overscroll-behavior: none;
}

#app { display: flex; flex-direction: column; height: 100%; }

.app-header {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: env(safe-area-inset-top) 16px 12px;
  background: rgba(245,245,247,0.92); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-title { font-size: 20px; font-weight: 700; letter-spacing: -0.3px; }
.header-actions { display: flex; gap: 8px; }
.icon-btn {
  background: transparent; border: none; color: var(--primary); font-size: 16px; padding: 8px;
  cursor: pointer; border-radius: 8px;
}

.alert-bar {
  display: flex; align-items: center; gap: 8px;
  margin: 10px 16px 0; padding: 10px 12px;
  background: var(--warning-bg); color: var(--warning-text);
  border-radius: 10px; font-weight: 600; font-size: 14px;
}
.alert-bar.hidden { display: none; }
.alert-icon {
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--warning-text); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; flex-shrink: 0;
}

.main-content {
  flex: 1; overflow-y: auto; padding: 12px 16px calc(88px + env(safe-area-inset-bottom));
  -webkit-overflow-scrolling: touch;
}

.view { display: none; animation: fadeIn 0.18s ease; }
.view.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.dashboard-cards {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 16px;
}
.card {
  background: var(--card); border-radius: 16px; padding: 14px 10px;
  box-shadow: var(--shadow); text-align: center;
}
.card-label { font-size: 12px; color: var(--secondary); margin-bottom: 6px; }
.card-value { font-size: 18px; font-weight: 700; letter-spacing: -0.5px; white-space: nowrap; }
.card.income .card-value { color: var(--income); }
.card.expense .card-value { color: var(--expense); }
.card.balance .card-value { color: var(--text); }
.card.balance.negative .card-value { color: var(--expense); }

.section-header {
  display: flex; align-items: baseline; justify-content: space-between;
  margin: 18px 0 10px;
}
.section-header h2 { font-size: 18px; font-weight: 700; margin: 0; }
.text-btn {
  background: transparent; border: none; color: var(--primary); font-size: 15px; cursor: pointer; padding: 4px 8px;
}
.text-btn.primary { font-weight: 600; }

.budget-list { display: flex; flex-direction: column; gap: 10px; }
.budget-item {
  background: var(--card); border-radius: 14px; padding: 12px 14px; box-shadow: var(--shadow);
}
.budget-header { display: flex; justify-content: space-between; font-size: 14px; margin-bottom: 8px; }
.budget-name { font-weight: 600; }
.budget-amount { color: var(--secondary); }
.budget-bar { height: 8px; background: #E5E5EA; border-radius: 4px; overflow: hidden; }
.budget-fill { height: 100%; border-radius: 4px; background: var(--primary); transition: width 0.3s; }
.budget-item.warn .budget-fill { background: #FF9500; }
.budget-item.over .budget-fill { background: var(--expense); }
.budget-item.warn .budget-name { color: #FF9500; }
.budget-item.over .budget-name { color: var(--warning-text); }
.budget-item.warn .budget-amount, .budget-item.over .budget-amount { font-weight: 700; }

.chart-wrap {
  background: var(--card); border-radius: 16px; padding: 12px; box-shadow: var(--shadow); margin-bottom: 16px;
  position: relative; height: 240px;
}

.filter-bar {
  background: var(--card); border-radius: 16px; padding: 14px; box-shadow: var(--shadow); margin-bottom: 16px;
}
.filter-row { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.filter-row:last-child { margin-bottom: 0; justify-content: flex-end; }
.filter-sep { color: var(--secondary); font-size: 14px; }

.ios-input {
  -webkit-appearance: none; appearance: none;
  border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px;
  font-size: 16px; background: var(--bg); color: var(--text); width: 100%;
  outline: none; transition: border-color 0.15s;
}
.ios-input:focus { border-color: var(--primary); }
.date-input { text-align: center; }
.amount-input { font-size: 22px; font-weight: 600; letter-spacing: -0.3px; }

.form-card {
  background: var(--card); border-radius: 18px; padding: 16px; box-shadow: var(--shadow);
}
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 14px; color: var(--secondary); margin-bottom: 6px; font-weight: 500; }
.segmented-control {
  display: flex; background: var(--bg); border-radius: 12px; padding: 4px;
}
.segment {
  flex: 1; border: none; background: transparent; padding: 10px; font-size: 16px; font-weight: 600;
  color: var(--secondary); border-radius: 10px; cursor: pointer;
}
.segment.active { background: var(--card); color: var(--text); box-shadow: 0 1px 4px rgba(0,0,0,0.08); }

.form-actions { display: flex; gap: 12px; margin-top: 24px; }
.btn {
  flex: 1; border: none; border-radius: 14px; padding: 14px; font-size: 17px; font-weight: 600; cursor: pointer;
}
.btn.primary { background: var(--primary); color: #fff; }
.btn.danger { background: var(--warning-bg); color: var(--danger); }
.btn.hidden { display: none; }

.transaction-list { display: flex; flex-direction: column; gap: 10px; }
.tx-item {
  background: var(--card); border-radius: 16px; padding: 14px; box-shadow: var(--shadow);
  display: flex; justify-content: space-between; align-items: center; cursor: pointer;
}
.tx-left { flex: 1; min-width: 0; }
.tx-meta { display: flex; gap: 8px; align-items: center; margin-bottom: 4px; }
.tx-date { font-size: 12px; color: var(--secondary); }
.tx-badge {
  font-size: 11px; padding: 2px 6px; border-radius: 6px; font-weight: 600;
}
.tx-badge.income { background: #E6F9ED; color: #1E7A34; }
.tx-badge.expense { background: #FFEBEA; color: #B71C1C; }
.tx-category { font-size: 15px; font-weight: 600; }
.tx-note { font-size: 12px; color: var(--secondary); margin-top: 2px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tx-right { text-align: right; }
.tx-amount { font-size: 18px; font-weight: 700; letter-spacing: -0.4px; }
.tx-amount.income { color: var(--income); }
.tx-amount.expense { color: var(--expense); }
.tx-account { font-size: 12px; color: var(--secondary); margin-top: 2px; }
.tx-empty { text-align: center; color: var(--secondary); padding: 40px 0; font-size: 15px; }

.tab-bar {
  position: fixed; bottom: 0; left: 0; right: 0;
  display: flex; justify-content: space-around; align-items: center;
  background: rgba(255,255,255,0.94); backdrop-filter: blur(14px);
  border-top: 1px solid var(--border); padding: 8px 0 calc(8px + env(safe-area-inset-bottom));
  z-index: 20;
}
.tab { flex: 1; border: none; background: transparent; text-align: center; padding: 6px 0; cursor: pointer; color: var(--secondary); }
.tab.active { color: var(--primary); }
.tab-icon { display: block; font-size: 13px; font-weight: 600; margin-bottom: 3px; }
.tab-label { display: block; font-size: 11px; }

.modal-overlay {
  position: fixed; inset: 0; z-index: 50;
  background: rgba(0,0,0,0.45); display: flex; align-items: flex-end; justify-content: center;
}
.modal-overlay.hidden { display: none; }
.modal {
  width: 100%; max-height: 85vh; background: var(--card);
  border-radius: 24px 24px 0 0; padding: 18px 16px calc(20px + env(safe-area-inset-bottom));
  display: flex; flex-direction: column; overflow: hidden;
}
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.modal-header h3 { margin: 0; font-size: 18px; }
.modal-body { overflow-y: auto; -webkit-overflow-scrolling: touch; font-size: 15px; line-height: 1.5; }
.modal-footer { margin-top: 14px; display: flex; flex-direction: column; gap: 10px; }
.modal-footer .btn { width: 100%; }
.modal-footer .btn.secondary { background: var(--bg); color: var(--text); }

.budget-edit-list { display: flex; flex-direction: column; gap: 12px; }
.budget-edit-row { display: flex; align-items: center; gap: 10px; }
.budget-edit-row label { flex: 1; font-size: 15px; }
.budget-edit-row input { width: 120px; text-align: right; }

.snap-list { display: flex; flex-direction: column; gap: 10px; margin-top: 8px; }
.snap-item {
  display: flex; justify-content: space-between; align-items: center;
  background: var(--bg); border-radius: 12px; padding: 12px;
}
.snap-info { font-size: 14px; color: var(--text); }
.snap-count { font-size: 12px; color: var(--secondary); margin-top: 2px; }
.snap-btn { background: var(--primary); color: #fff; border: none; border-radius: 10px; padding: 8px 14px; font-size: 14px; cursor: pointer; }

.toast {
  position: fixed; bottom: 110px; left: 50%; transform: translateX(-50%);
  background: rgba(28,28,30,0.92); color: #fff; padding: 10px 18px; border-radius: 20px;
  font-size: 14px; z-index: 60; pointer-events: none;
}
.toast.hidden { display: none; }

.settings-list { display: flex; flex-direction: column; gap: 12px; margin-top: 8px; }
.settings-item {
  background: var(--bg); border-radius: 12px; padding: 14px; display: flex; justify-content: space-between; align-items: center; cursor: pointer;
}
.settings-item-text { font-size: 15px; }
.settings-item-desc { font-size: 12px; color: var(--secondary); margin-top: 2px; }

.category-manager { display: flex; flex-direction: column; gap: 8px; }
.category-section { margin-bottom: 8px; }
.category-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.category-tag {
  display: inline-flex; align-items: center; gap: 4px;
  background: var(--bg); border-radius: 10px; padding: 6px 10px;
  font-size: 14px; color: var(--text);
}
.category-tag button {
  background: transparent; border: none; color: var(--secondary); font-size: 16px; line-height: 1; padding: 0 0 0 4px; cursor: pointer;
}
.category-add-row { display: flex; gap: 8px; margin-top: 10px; }
.category-add-row .cat-input, .category-add-row .child-input, .category-add-row .parent-input { flex: 1; }
.category-add-row .btn { width: auto; padding: 10px 16px; }
.custom-cat-row.hidden { display: none; }
.custom-cat-input { display: flex; gap: 8px; }
.custom-cat-input .ios-input { flex: 1; }
.custom-cat-input .btn { width: auto; padding: 10px 16px; }
.category-parent-row { background: var(--bg); border-radius: 12px; padding: 12px; margin-bottom: 10px; }
.category-parent-name { font-weight: 700; font-size: 15px; margin-bottom: 8px; }
.text-btn.danger { color: var(--expense); font-size: 13px; padding: 0; }

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1C1C1E; --card: #2C2C2E; --text: #FFFFFF; --secondary: #8E8E93;
    --border: #3A3A3C; --primary: #0A84FF; --income: #30D158; --expense: #FF453A;
    --warning-bg: #3A1C1C; --warning-text: #FF6B6B; --danger: #FF453A;
  }
  .app-header { background: rgba(28,28,30,0.92); }
  .tab-bar { background: rgba(44,44,46,0.94); }
  .segment.active { background: #3A3A3C; }
  .tx-badge.income { background: #1C3B25; }
  .tx-badge.expense { background: #3B1C1C; }
  .ios-input { background: #1C1C1E; color: #fff; }
}