:root {
  --bg: #0f1117;
  --card: #1a1d27;
  --border: #2a2d3e;
  --text: #e2e8f0;
  --muted: #8892a4;
  --accent: #6c63ff;
  --income: #34d399;
  --expense: #f87171;
  --installment: #fbbf24;
  --sidebar-w: 200px;
  --bottom-nav-h: 60px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, 'Noto Sans TC', sans-serif;
  font-size: 14px;
}

/* ── Sidebar (電腦版) ── */
.sidebar {
  position: fixed;
  top: 0; left: 0;
  width: var(--sidebar-w);
  height: 100vh;
  background: var(--card);
  border-right: 1px solid var(--border);
  padding: 24px 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
  z-index: 100;
}
.sidebar-title {
  font-size: 16px;
  font-weight: 700;
  padding: 0 20px 20px;
  color: var(--accent);
}
.sidebar .nav-item {
  display: block;
  padding: 10px 20px;
  color: var(--muted);
  text-decoration: none;
  border-radius: 0 8px 8px 0;
  transition: all .15s;
}
.sidebar .nav-item:hover,
.sidebar .nav-item.active {
  background: rgba(108,99,255,.15);
  color: var(--text);
}

/* ── Main ── */
.main {
  margin-left: var(--sidebar-w);
  padding: 24px;
  min-height: 100vh;
}

/* ── Summary Bar ── */
.summary-bar {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
}
.summary-card {
  flex: 1;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 20px;
}
.summary-label { color: var(--muted); font-size: 12px; margin-bottom: 6px; }
.summary-value { font-size: 22px; font-weight: 700; }
.summary-value.expense { color: var(--expense); }
.summary-value.income  { color: var(--income); }
.summary-value.installment { color: var(--installment); }

/* ── Page ── */
.page { display: none; }
.page.active { display: block; }

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}
.page-header h2 { font-size: 20px; font-weight: 700; }

.filters { display: flex; gap: 8px; flex-wrap: wrap; }
select, .filters input[type="text"] {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 10px;
  border-radius: 8px;
  font-size: 13px;
}
.filters input[type="text"] {
  min-width: 160px;
  outline: none;
}
.filters input[type="text"]:focus,
.filters input[type="date"]:focus {
  border-color: var(--accent);
}
.filters input[type="date"] {
  outline: none;
  color-scheme: dark;
  cursor: pointer;
}

/* ── Chart Toggle ── */
.chart-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 5px 14px;
  border-radius: 8px;
  font-size: 12px;
  cursor: pointer;
  margin-bottom: 10px;
  transition: all .15s;
}
.chart-toggle:hover { border-color: var(--accent); color: var(--text); }
.chart-toggle.open  { color: var(--accent); border-color: var(--accent); }

/* ── Charts ── */
.chart-row {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
}
.chart-box {
  flex: 1;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.chart-box.full { flex: 1 1 100%; }

/* ── Table ── */
.table-wrap {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow-x: auto;
}
table { width: 100%; border-collapse: collapse; table-layout: fixed; }
td { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
th {
  background: rgba(108,99,255,.1);
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

/* 日常記帳：#, 日期, 分類, 子分類, 幣別, 金額, 台幣, 付款, 備註 */
#daily-table { min-width: 900px; }
#daily-table th:nth-child(1), #daily-table td:nth-child(1) { width: 44px; text-align: right; }
#daily-table th:nth-child(2), #daily-table td:nth-child(2) { width: 110px; }
#daily-table th:nth-child(3), #daily-table td:nth-child(3) { width: 90px; }
#daily-table th:nth-child(4), #daily-table td:nth-child(4) { width: 90px; }
#daily-table th:nth-child(5), #daily-table td:nth-child(5) { width: 70px; }
#daily-table th:nth-child(6), #daily-table td:nth-child(6) { width: 90px; }
#daily-table th:nth-child(7), #daily-table td:nth-child(7) { width: 100px; }
#daily-table th:nth-child(8), #daily-table td:nth-child(8) { width: 160px; }
#daily-table th:nth-child(9), #daily-table td:nth-child(9) { min-width: 160px; }

/* 旅行記帳：#, 日期, 類別, 項目, 幣別, 金額, 台幣, 付款 */
#travel-table { min-width: 820px; }
#travel-table th:nth-child(1), #travel-table td:nth-child(1) { width: 44px; text-align: right; }
#travel-table th:nth-child(2), #travel-table td:nth-child(2) { width: 110px; }
#travel-table th:nth-child(3), #travel-table td:nth-child(3) { width: 80px; }
#travel-table th:nth-child(4), #travel-table td:nth-child(4) { min-width: 180px; }
#travel-table th:nth-child(5), #travel-table td:nth-child(5) { width: 70px; }
#travel-table th:nth-child(6), #travel-table td:nth-child(6) { width: 90px; }
#travel-table th:nth-child(7), #travel-table td:nth-child(7) { width: 100px; }
#travel-table th:nth-child(8), #travel-table td:nth-child(8) { width: 140px; }

/* Pa 記帳：#, 日期, 分類, 備註, 幣別, 金額, 付款 */
#pa-table { min-width: 760px; }
#pa-table th:nth-child(1), #pa-table td:nth-child(1) { width: 44px; text-align: right; }
#pa-table th:nth-child(2), #pa-table td:nth-child(2) { width: 110px; }
#pa-table th:nth-child(3), #pa-table td:nth-child(3) { width: 90px; }
#pa-table th:nth-child(4), #pa-table td:nth-child(4) { min-width: 180px; }
#pa-table th:nth-child(5), #pa-table td:nth-child(5) { width: 70px; }
#pa-table th:nth-child(6), #pa-table td:nth-child(6) { width: 90px; }
#pa-table th:nth-child(7), #pa-table td:nth-child(7) { width: 150px; }
td {
  padding: 9px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}
tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(255,255,255,.02); }

/* ── Sortable headers ── */
th[data-col] {
  cursor: pointer;
  user-select: none;
}
th[data-col]:hover { color: var(--text); }
th[data-col]::after { content: " ⇅"; opacity: .35; font-size: 11px; }
th[data-col].sort-asc::after  { content: " ▲"; opacity: 1; color: var(--accent); }
th[data-col].sort-desc::after { content: " ▼"; opacity: 1; color: var(--accent); }

/* ── Trip Tabs ── */
.trip-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}
.trip-tab {
  padding: 7px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--muted);
  cursor: pointer;
  font-size: 13px;
  transition: all .15s;
}
.trip-tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* ── Trip Summary ── */
.trip-summary {
  margin-top: 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 20px;
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}
.trip-summary-item { display: flex; flex-direction: column; gap: 4px; }
.trip-summary-item .label { font-size: 12px; color: var(--muted); }
.trip-summary-item .value { font-size: 18px; font-weight: 700; color: var(--income); }

/* ── Installments ── */
.installment-total {
  background: var(--card);
  border: 1px solid var(--installment);
  border-radius: 12px;
  padding: 16px 20px;
  margin-bottom: 16px;
  font-size: 16px;
  color: var(--installment);
}
.installment-list { display: flex; flex-direction: column; gap: 12px; }
.installment-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 20px;
}
.inst-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}
.inst-name { font-weight: 600; font-size: 15px; }
.inst-amount { color: var(--installment); font-weight: 700; }
.inst-meta {
  display: flex;
  gap: 16px;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 10px;
}
.progress-bar {
  height: 6px;
  background: var(--border);
  border-radius: 99px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: var(--installment);
  border-radius: 99px;
  transition: width .4s;
}

/* ── Section Title ── */
.section-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 10px;
  letter-spacing: .05em;
  text-transform: uppercase;
}

/* ── Overview ── */
.overview-cards {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.overview-card {
  flex: 1;
  min-width: 140px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 20px;
}
.overview-card .label { font-size: 12px; color: var(--muted); margin-bottom: 6px; }
.overview-card .value { font-size: 20px; font-weight: 700; color: var(--income); }

/* ── Bottom Nav (手機版) ── */
.bottom-nav { display: none; }

/* ── 手機響應式 ── */
@media (max-width: 768px) {
  .sidebar { display: none; }
  .main {
    margin-left: 0;
    padding: 16px 12px;
    padding-bottom: calc(var(--bottom-nav-h) + 16px);
  }
  .bottom-nav {
    display: flex;
    position: fixed;
    bottom: 0; left: 0; right: 0;
    height: var(--bottom-nav-h);
    background: var(--card);
    border-top: 1px solid var(--border);
    z-index: 100;
  }
  .bottom-nav .nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    text-decoration: none;
    color: var(--muted);
    font-size: 11px;
    transition: color .15s;
  }
  .bottom-nav .nav-item.active { color: var(--accent); }
  .nav-icon { font-size: 18px; }

  .summary-bar { flex-direction: column; gap: 10px; }
  .chart-row { flex-direction: column; }
  .page-header { flex-direction: column; align-items: flex-start; gap: 10px; }
  .filters { width: 100%; }
  .filters select { flex: 1; }
}

/* ── Utility ── */
.text-income   { color: var(--income); }
.text-expense  { color: var(--expense); }
.text-muted    { color: var(--muted); }
.text-right    { text-align: right; }