:root {
  --bg: #f0f2f5;
  --sidebar-bg: #1a1f36;
  --sidebar-hover: #252b48;
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --card-bg: #ffffff;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 4px 12px rgba(0,0,0,.04);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

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

/* Sidebar */
.sidebar {
  width: 240px;
  background: var(--sidebar-bg);
  color: #cbd5e1;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 24px 20px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  font-size: 16px;
}

.logo-text { font-size: 16px; font-weight: 600; color: #fff; }

.nav { padding: 12px 10px; flex: 1; }

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 14px;
  border-radius: 8px;
  color: #94a3b8;
  text-decoration: none;
  font-size: 14px;
  margin-bottom: 2px;
  transition: all .15s;
}

.nav-item:hover { background: var(--sidebar-hover); color: #e2e8f0; }
.nav-item.active { background: var(--primary); color: #fff; }
.nav-icon { font-size: 16px; width: 22px; text-align: center; }

/* Main */
.main { flex: 1; display: flex; flex-direction: column; overflow: hidden; }

.header {
  background: var(--card-bg);
  padding: 20px 28px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header h1 { font-size: 22px; font-weight: 600; }

.content { padding: 24px 28px; overflow-y: auto; flex: 1; }

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

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--primary);
}

.stat-card.warning { border-left-color: var(--warning); }
.stat-card.success { border-left-color: var(--success); }
.stat-card.danger { border-left-color: var(--danger); }

.stat-label { font-size: 13px; color: var(--text-muted); margin-bottom: 6px; }
.stat-value { font-size: 28px; font-weight: 700; }
.stat-value.money::before { content: "¥"; font-size: 16px; font-weight: 500; margin-right: 2px; }

/* Card */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

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

.card-header h2 { font-size: 16px; font-weight: 600; }

/* Toolbar */
.toolbar {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
  align-items: center;
  flex-wrap: wrap;
}

.search-input, .select-input {
  padding: 9px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  background: var(--card-bg);
  outline: none;
  transition: border-color .15s;
}

/* Tab bar */
.tab-bar {
  display: flex;
  gap: 2px;
  background: #f1f5f9;
  border-radius: 8px;
  padding: 3px;
}

.tab-btn {
  background: none;
  border: none;
  padding: 7px 18px;
  font-size: 14px;
  border-radius: 6px;
  cursor: pointer;
  color: var(--text-muted);
  transition: all .15s;
  font-weight: 500;
}

.tab-btn:hover {
  color: var(--text);
}

.tab-btn.active {
  background: #fff;
  color: var(--text);
  box-shadow: 0 1px 3px rgba(0,0,0,.1);
}

.search-input { width: 280px; }
.search-input:focus, .select-input:focus { border-color: var(--primary); }

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

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

th, td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  background: #f8fafc;
  font-weight: 600;
  color: var(--text-muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .03em;
  white-space: nowrap;
}

tr:hover td { background: #f8fafc; }

.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-muted);
}

/* Badge */
.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
}

.badge-active { background: #d1fae5; color: #065f46; }
.badge-expired { background: #fee2e2; color: #991b1b; }
.badge-warning { background: #fef3c7; color: #92400e; }

/* Plans grid */
.plans-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.plan-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  position: relative;
}

.plan-card.inactive { opacity: .6; }

.plan-name { font-size: 18px; font-weight: 600; margin-bottom: 6px; }
.plan-desc { font-size: 13px; color: var(--text-muted); margin-bottom: 16px; min-height: 40px; }
.plan-price { font-size: 32px; font-weight: 700; color: var(--primary); }
.plan-price small { font-size: 14px; font-weight: 400; color: var(--text-muted); }
.plan-meta { margin-top: 12px; font-size: 13px; color: var(--text-muted); }
.plan-actions { margin-top: 16px; display: flex; gap: 8px; }

/* Buttons */
.btn {
  padding: 9px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  font-size: 14px;
  cursor: pointer;
  transition: all .15s;
  color: var(--text);
}

.btn:hover { background: #f1f5f9; }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-hover); }
.btn-danger { color: var(--danger); border-color: #fecaca; }
.btn-danger:hover { background: #fef2f2; }
.btn-sm { padding: 5px 12px; font-size: 13px; }
.btn-success { background: var(--success); color: #fff; border-color: var(--success); }
.btn-success:hover { background: #059669; }

.actions { display: flex; gap: 6px; }

/* Modal */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.modal-overlay.open { display: flex; }

.modal {
  background: var(--card-bg);
  border-radius: 12px;
  width: 90%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,.2);
}

.modal-header {
  padding: 18px 22px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 { font-size: 17px; }

.modal-close {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-muted);
  line-height: 1;
}

.modal-body { padding: 22px; }

.modal-footer {
  padding: 14px 22px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

/* Form */
.form-group { margin-bottom: 16px; }
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text);
}

.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;
  outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus { border-color: var(--primary); }

.plan-checkboxes {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 220px;
  overflow-y: auto;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #f8fafc;
}

.plan-checkbox {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 6px;
  cursor: pointer;
  background: #fff;
  border: 1px solid var(--border);
}

.plan-checkbox:hover { border-color: var(--primary); }

.plan-checkbox input {
  width: 16px;
  height: 16px;
  margin: 0;
}

.plan-checkbox span:first-of-type { flex: 1; }

.plan-checkbox-price {
  color: #64748b;
  font-size: 13px;
  white-space: nowrap;
}

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

/* Toast */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 12px 20px;
  border-radius: 8px;
  color: #fff;
  font-size: 14px;
  box-shadow: var(--shadow);
  animation: slideIn .3s ease;
}

.toast-success { background: var(--success); }
.toast-error { background: var(--danger); }

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

/* Login */
.login-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 3000;
}

.login-overlay.hidden { display: none; }

.login-box {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 40px;
  width: 380px;
  max-width: 90vw;
  box-shadow: 0 20px 60px rgba(0,0,0,.15);
}

.login-logo {
  text-align: center;
  margin-bottom: 8px;
}

.login-logo .logo-icon {
  width: 48px;
  height: 48px;
  font-size: 22px;
  margin: 0 auto 12px;
}

.login-title {
  text-align: center;
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 4px;
}

.login-subtitle {
  text-align: center;
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 28px;
}

.login-form .form-group { margin-bottom: 20px; }

.login-form .form-group label {
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 8px;
}

.login-form .form-group input {
  padding: 11px 14px;
  font-size: 15px;
}

.login-form .btn-primary {
  width: 100%;
  padding: 12px;
  font-size: 15px;
  font-weight: 500;
}

.login-error {
  background: #fef2f2;
  color: var(--danger);
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 13px;
  margin-bottom: 16px;
  display: none;
}

.login-error.show { display: block; }

.login-hint {
  text-align: center;
  margin-top: 16px;
  font-size: 13px;
  color: var(--text-muted);
}

.login-hint code {
  background: #f1f5f9;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 12px;
}

.login-toggle {
  text-align: center;
  margin-top: 20px;
  font-size: 14px;
  color: var(--text-muted);
}

.login-toggle a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}

.login-toggle a:hover {
  text-decoration: underline;
}

/* Header user info */
.header-user {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-muted);
}

.header-user-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 12px;
  font-size: 13px;
  cursor: pointer;
  color: var(--text-muted);
  transition: all .15s;
}

.header-user-btn:hover {
  background: #f1f5f9;
  color: var(--danger);
  border-color: #fecaca;
}

@media (max-width: 768px) {
  .sidebar { width: 64px; }
  .logo-text, .nav-item span:not(.nav-icon) { display: none; }
  .nav-item { justify-content: center; padding: 12px; }
  .form-row { grid-template-columns: 1fr; }
}