:root {
  --color-bg: #F8F9FA;
  --color-surface: #FFFFFF;
  --color-border: #E5E7EB;
  --color-text: #111827;
  --color-text-muted: #6B7280;
  --color-primary: #1D4ED8;
  --color-primary-light: #EFF6FF;
  --color-success: #059669;
  --color-success-light: #ECFDF5;
  --color-warning: #D97706;
  --color-warning-light: #FFFBEB;
  --color-danger: #DC2626;
  --color-danger-light: #FEF2F2;
  --color-income: #059669;
  --color-expense: #DC2626;
  --color-transfer: #7C3AED;
  --sidebar-width: 220px;
  --radius: 8px;
  --radius-sm: 4px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans TC', sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.5;
}

/* ── Layout ──────────────────────────────── */
.app-layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: var(--sidebar-width);
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
}

.sidebar-logo {
  padding: 20px 16px 16px;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-logo .company {
  font-size: 12px;
  color: var(--color-text-muted);
  font-weight: 500;
  letter-spacing: 0.05em;
}

.sidebar-logo .system-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
  margin-top: 2px;
}

.sidebar-nav {
  flex: 1;
  padding: 12px 8px;
  overflow-y: auto;
}

.nav-section-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 8px 8px 4px;
  margin-top: 8px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 13.5px;
  font-weight: 500;
  transition: all 0.15s;
  cursor: pointer;
}

.nav-item:hover { background: var(--color-bg); color: var(--color-text); }
.nav-item.active { background: var(--color-primary-light); color: var(--color-primary); }
.nav-item .icon { width: 18px; text-align: center; flex-shrink: 0; }

.sidebar-footer {
  padding: 12px;
  border-top: 1px solid var(--color-border);
}

.user-info {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px;
  border-radius: var(--radius-sm);
}

.user-avatar {
  width: 30px; height: 30px;
  background: var(--color-primary);
  color: white;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700;
  flex-shrink: 0;
}

.user-name { font-size: 13px; font-weight: 600; }
.user-role { font-size: 11px; color: var(--color-text-muted); }

.btn-logout {
  width: 100%;
  margin-top: 8px;
  padding: 6px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
}
.btn-logout:hover { background: var(--color-danger-light); color: var(--color-danger); border-color: var(--color-danger); }

.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  padding: 24px;
  min-height: 100vh;
}

/* ── Page header ──────────────────────────── */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.page-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
}

.page-subtitle {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* ── Cards ────────────────────────────────── */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}

.card-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

/* ── Buttons ──────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s;
  text-decoration: none;
}

.btn-primary { background: var(--color-primary); color: white; }
.btn-primary:hover { background: #1e40af; }

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

.btn-danger { background: var(--color-danger); color: white; }
.btn-danger:hover { background: #b91c1c; }

.btn-success { background: var(--color-success); color: white; }
.btn-success:hover { background: #047857; }

.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn-icon { padding: 6px; }

/* ── Form ─────────────────────────────────── */
.form-group { margin-bottom: 14px; }
.form-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.form-label .required { color: var(--color-danger); margin-left: 2px; }

.form-control {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--color-text);
  background: var(--color-surface);
  transition: border-color 0.15s;
  outline: none;
}
.form-control:focus { border-color: var(--color-primary); box-shadow: 0 0 0 2px rgba(29,78,216,0.1); }

.form-row { display: grid; gap: 14px; }
.form-row.cols-2 { grid-template-columns: 1fr 1fr; }
.form-row.cols-3 { grid-template-columns: 1fr 1fr 1fr; }
.form-row.cols-4 { grid-template-columns: repeat(4, 1fr); }

/* ── Tabs ─────────────────────────────────── */
.tabs {
  display: flex;
  gap: 2px;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  padding: 3px;
  margin-bottom: 20px;
  width: fit-content;
}

.tab-btn {
  padding: 6px 18px;
  border-radius: 4px;
  border: none;
  background: none;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all 0.15s;
}

.tab-btn.active {
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: var(--shadow);
}

.tab-btn.income.active { color: var(--color-income); }
.tab-btn.expense.active { color: var(--color-expense); }
.tab-btn.transfer.active { color: var(--color-transfer); }

/* ── Table ────────────────────────────────── */
.table-wrap { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

th {
  text-align: left;
  padding: 9px 12px;
  font-size: 11px;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: middle;
}

tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--color-bg); }

/* ── Badge ────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
}

.badge-income { background: var(--color-success-light); color: var(--color-success); }
.badge-expense { background: var(--color-danger-light); color: var(--color-danger); }
.badge-transfer { background: #F3F4F6; color: var(--color-transfer); }
.badge-warning { background: var(--color-warning-light); color: var(--color-warning); }
.badge-success { background: var(--color-success-light); color: var(--color-success); }
.badge-muted { background: var(--color-bg); color: var(--color-text-muted); }

/* ── Amounts ──────────────────────────────── */
.amount-income { color: var(--color-income); font-weight: 600; }
.amount-expense { color: var(--color-expense); font-weight: 600; }
.amount-transfer { color: var(--color-transfer); font-weight: 600; }

/* ── Status cards ─────────────────────────── */
.status-card {
  padding: 16px 20px;
  border-radius: var(--radius);
  border-left: 4px solid;
}
.status-card.green { background: var(--color-success-light); border-color: var(--color-success); }
.status-card.yellow { background: var(--color-warning-light); border-color: var(--color-warning); }
.status-card.red { background: var(--color-danger-light); border-color: var(--color-danger); }

/* ── Modal ────────────────────────────────── */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 200;
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
}

.modal {
  background: var(--color-surface);
  border-radius: var(--radius);
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-md);
}

.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-border);
}

.modal-title { font-size: 16px; font-weight: 700; }

.modal-close {
  width: 28px; height: 28px;
  background: none; border: none;
  color: var(--color-text-muted);
  cursor: pointer; font-size: 18px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
}
.modal-close:hover { background: var(--color-bg); }

.modal-body { padding: 20px; }
.modal-footer {
  display: flex; justify-content: flex-end; gap: 8px;
  padding: 12px 20px;
  border-top: 1px solid var(--color-border);
}

/* ── Utility ──────────────────────────────── */
.hidden { display: none !important; }
.text-muted { color: var(--color-text-muted); }
.text-right { text-align: right; }
.text-center { text-align: center; }
.font-mono { font-family: 'SF Mono', 'Fira Code', monospace; }
.mt-4 { margin-top: 4px; }
.mt-8 { margin-top: 8px; }
.mt-12 { margin-top: 12px; }
.mt-16 { margin-top: 16px; }
.mt-20 { margin-top: 20px; }
.gap-8 { gap: 8px; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }

/* ── Toast ────────────────────────────────── */
#toast-container {
  position: fixed;
  bottom: 24px; right: 24px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  animation: slideIn 0.2s ease;
}

.toast-success { background: #1f2937; color: white; }
.toast-error { background: var(--color-danger); color: white; }

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* ── Scrollbar ────────────────────────────── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 999px; }