:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --danger: #dc2626;
  --danger-light: #fee2e2;
  --success: #16a34a;
  --success-light: #dcfce7;
  --warning: #d97706;
  --warning-light: #fef3c7;
  --text: #1f2937;
  --text-secondary: #6b7280;
  --border: #e5e7eb;
  --bg: #f3f4f6;
  --sidebar-bg: #111827;
  --sidebar-text: #9ca3af;
  --sidebar-active: #2563eb;
  --card-bg: #ffffff;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
}

.hidden { display: none !important; }

/* ---------- 登录页 ---------- */
.login-view {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 50%, #3b82f6 100%);
  padding: 20px;
}

.login-card {
  background: #fff;
  border-radius: 16px;
  padding: 40px 36px;
  width: 100%;
  max-width: 380px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
  text-align: center;
}

.login-logo {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  border-radius: 14px;
  background: linear-gradient(135deg, #2563eb, #3b82f6);
  color: #fff;
  font-size: 28px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.35);
}

.login-card h1 { font-size: 20px; margin-bottom: 4px; }
.login-sub { color: var(--text-secondary); font-size: 13px; margin-bottom: 28px; }

.login-card .form-group { text-align: left; margin-bottom: 16px; }
.login-card label { display: block; font-size: 13px; margin-bottom: 6px; color: var(--text-secondary); }
.login-card input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}
.login-card input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1); }

.login-error {
  background: var(--danger-light);
  color: var(--danger);
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 13px;
  margin-bottom: 14px;
}

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

.sidebar {
  width: 220px;
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.logo-badge {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, #2563eb, #3b82f6);
  color: #fff;
  font-weight: 700;
  font-size: 17px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-text { color: #fff; font-size: 15px; font-weight: 600; }

.sidebar-nav { flex: 1; padding: 14px 10px; }

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 14px;
  margin-bottom: 4px;
  border-radius: 8px;
  color: var(--sidebar-text);
  text-decoration: none;
  font-size: 14px;
  transition: all 0.15s;
}
.nav-item:hover { background: rgba(255, 255, 255, 0.06); color: #e5e7eb; }
.nav-item.active { background: var(--sidebar-active); color: #fff; }

.nav-icon { width: 18px; height: 18px; fill: currentColor; flex-shrink: 0; }

.sidebar-footer {
  padding: 16px 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.admin-name { font-size: 13px; color: #d1d5db; }
.btn-logout {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #d1d5db;
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 12px;
  transition: all 0.15s;
}
.btn-logout:hover { background: rgba(220, 38, 38, 0.2); border-color: var(--danger); color: #fca5a5; }

.main {
  flex: 1;
  margin-left: 220px;
  padding: 28px 32px;
}

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

.page-header { margin-bottom: 22px; }
.page-header h2 { font-size: 22px; font-weight: 600; }
.page-header p { color: var(--text-secondary); margin-top: 4px; font-size: 13px; }

/* ---------- 统计卡片 ---------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}
.stat-value { font-size: 28px; font-weight: 700; color: var(--primary); }
.stat-label { color: var(--text-secondary); font-size: 13px; margin-top: 6px; }

/* ---------- 卡片 ---------- */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  margin-bottom: 24px;
  overflow: hidden;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}
.card-header h3 { font-size: 15px; font-weight: 600; }
.card-hint { color: var(--text-secondary); font-size: 12px; }
.checkbox-label { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--text-secondary); cursor: pointer; }

.toolbar { display: flex; gap: 10px; align-items: center; }
.input {
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  outline: none;
  width: 260px;
  transition: border-color 0.2s;
}
.input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1); }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 12px 16px; text-align: left; white-space: nowrap; }
th {
  background: #f9fafb;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  border-bottom: 1px solid var(--border);
}
td { border-bottom: 1px solid #f3f4f6; font-size: 13px; }
tr:hover td { background: #f9fafb; }
tr:last-child td { border-bottom: none; }

.mono { font-family: "SF Mono", Consolas, "Courier New", monospace; font-size: 12px; }
.truncate { max-width: 220px; overflow: hidden; text-overflow: ellipsis; }

/* ---------- 状态标签 ---------- */
.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 500;
}
.badge-success { background: var(--success-light); color: var(--success); }
.badge-danger { background: var(--danger-light); color: var(--danger); }
.badge-warning { background: var(--warning-light); color: var(--warning); }
.badge-info { background: var(--primary-light); color: var(--primary); }

/* ---------- 按钮 ---------- */
.btn {
  padding: 9px 16px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.15s;
  font-weight: 500;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-block { width: 100%; padding: 11px; font-size: 15px; }
.btn-sm { padding: 5px 12px; font-size: 12px; }
.btn-danger { background: var(--danger-light); color: var(--danger); }
.btn-danger:hover { background: var(--danger); color: #fff; }
.btn-ghost { background: transparent; border: 1px solid var(--border); color: var(--text-secondary); }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }

/* ---------- 分页 ---------- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  padding: 14px 20px;
  border-top: 1px solid var(--border);
}
.page-btn {
  min-width: 32px;
  height: 32px;
  padding: 0 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  color: var(--text);
  cursor: pointer;
  font-size: 13px;
  transition: all 0.15s;
}
.page-btn:hover:not(:disabled) { border-color: var(--primary); color: var(--primary); }
.page-btn.active { background: var(--primary); border-color: var(--primary); color: #fff; }
.page-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.page-info { color: var(--text-secondary); font-size: 13px; margin-right: 8px; }

/* ---------- 空状态 ---------- */
.empty {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-secondary);
  font-size: 13px;
}

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: #111827;
  color: #fff;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 14px;
  z-index: 1000;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  animation: fadeIn 0.2s ease;
}
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
@keyframes fadeIn { from { opacity: 0; transform: translate(-50%, -8px); } to { opacity: 1; transform: translate(-50%, 0); } }

@media (max-width: 768px) {
  .sidebar { width: 60px; }
  .sidebar-logo span.logo-text, .nav-item span:not(.nav-icon), .sidebar-footer .admin-name { display: none; }
  .nav-item { justify-content: center; padding: 11px; }
  .main { margin-left: 60px; padding: 20px 16px; }
  .toolbar { flex-direction: column; align-items: stretch; }
  .input { width: 100%; }
}