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

:root {
  --primary: #f97316;
  --primary-light: #fed7aa;
  --primary-dark: #ea580c;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #1e293b;
  --text-light: #64748b;
  --border: #e2e8f0;
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --info: #3b82f6;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
}

body {
  font-family: "Noto Sans TC", -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

.sidebar {
  width: 240px;
  background: var(--card);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 10;
}

.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid var(--border);
}
.sidebar-header h1 {
  font-size: 17px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.sidebar-header h1 .logo {
  width: 32px; height: 32px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  color: white; font-size: 16px;
}
.sidebar-header p {
  font-size: 12px;
  color: var(--text-light);
  margin-top: 4px;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 8px 12px;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  color: var(--text-light);
  transition: all 0.15s;
  margin-bottom: 2px;
}
.nav-item:hover { background: #f1f5f9; color: var(--text); }
.nav-item.active {
  background: #fff7ed;
  color: var(--primary-dark);
  font-weight: 600;
}
.nav-item .icon { width: 18px; text-align: center; }

.sidebar-footer {
  padding: 12px;
  border-top: 1px solid var(--border);
}
.sidebar-footer a {
  display: flex; align-items: center; gap: 8px;
  color: var(--text-light); text-decoration: none;
  font-size: 13px; padding: 8px 14px;
  border-radius: 8px;
  transition: all 0.15s;
}
.sidebar-footer a:hover { background: #f1f5f9; color: var(--text); }

/* Main */
.main {
  flex: 1;
  margin-left: 240px;
  padding: 24px 32px;
  min-height: 100vh;
}

.page { display: none; }
.page.active { display: block; }

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}
.page-header h2 { font-size: 22px; font-weight: 700; }

/* Stat Cards */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}
.stat-card .value {
  font-size: 28px;
  font-weight: 700;
  color: var(--primary-dark);
}
.stat-card .label {
  font-size: 13px;
  color: var(--text-light);
  margin-top: 4px;
}

/* Cards */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
}
.card-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 12px;
}

/* Tables */
.table-wrap { overflow-x: auto; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
th, td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
th {
  font-weight: 600;
  color: var(--text-light);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
tr:hover td { background: #f8fafc; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  color: var(--text);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}
.btn:hover { border-color: #cbd5e1; background: #f8fafc; }
.btn-primary {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); }
.btn-success { background: var(--success); color: white; border-color: var(--success); }
.btn-success:hover { background: #16a34a; }
.btn-danger { background: var(--danger); color: white; border-color: var(--danger); }
.btn-danger:hover { background: #dc2626; }
.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-group { display: flex; gap: 8px; }

/* Badge */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 9999px;
  font-size: 11px;
  font-weight: 600;
}
.badge-success { background: #dcfce7; color: #16a34a; }
.badge-danger { background: #fee2e2; color: #dc2626; }
.badge-warning { background: #fef3c7; color: #d97706; }
.badge-info { background: #dbeafe; color: #2563eb; }

/* Forms */
.form-group { margin-bottom: 16px; }
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  color: var(--text);
  outline: none;
  transition: border-color 0.2s;
  font-family: inherit;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

/* Modal */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 100;
  align-items: center;
  justify-content: center;
}
.modal-overlay.show { display: flex; }
.modal {
  background: var(--card);
  border-radius: 16px;
  padding: 28px;
  width: 560px;
  max-width: 90vw;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}
.modal h2 {
  font-size: 18px;
  margin-bottom: 20px;
}
.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 20px;
}

/* Toggle */
.toggle {
  position: relative;
  width: 44px; height: 24px;
  background: #cbd5e1;
  border-radius: 12px;
  cursor: pointer;
  transition: background 0.2s;
}
.toggle.on { background: var(--success); }
.toggle::after {
  content: '';
  position: absolute;
  width: 20px; height: 20px;
  background: white;
  border-radius: 50%;
  top: 2px; left: 2px;
  transition: transform 0.2s;
}
.toggle.on::after { transform: translateX(20px); }

/* Empty state */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-light);
}
.empty-state .icon { font-size: 48px; margin-bottom: 12px; }
.empty-state h3 { font-size: 18px; color: var(--text); margin-bottom: 8px; }

/* Toast */
.toast {
  position: fixed;
  top: 20px; right: 20px;
  padding: 12px 20px;
  border-radius: 10px;
  color: white;
  font-size: 14px;
  font-weight: 500;
  z-index: 200;
  box-shadow: var(--shadow-lg);
  animation: slideIn 0.3s ease;
}
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
.toast.info { background: var(--info); }
@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* Template editor */
.template-preview {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  background: #fafafa;
  min-height: 100px;
  margin-top: 8px;
}
.var-tag {
  display: inline-block;
  padding: 2px 8px;
  background: #fff7ed;
  border: 1px solid var(--primary-light);
  border-radius: 4px;
  font-size: 12px;
  color: var(--primary-dark);
  cursor: pointer;
  margin: 2px;
}
.var-tag:hover { background: var(--primary-light); }

/* Recipient chip */
.recipient-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  background: #f1f5f9;
  border-radius: 6px;
  font-size: 13px;
  margin: 2px;
}
.recipient-chip .remove {
  cursor: pointer;
  color: var(--text-light);
  font-size: 16px;
  line-height: 1;
}
.recipient-chip .remove:hover { color: var(--danger); }

/* Responsive */
@media (max-width: 768px) {
  .sidebar { width: 60px; }
  .sidebar-header h1 span, .sidebar-header p, .nav-item span { display: none; }
  .main { margin-left: 60px; padding: 16px; }
  .form-row { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}