:root {
  --primary: #123B66;
  --primary-dark: #0B2742;
  --primary-mid: #1F5D91;
  --primary-soft: #EAF1F7;
  --page-bg: #F4F7FA;
  --white: #FFFFFF;
  --success: #198754;
  --warning: #D99A18;
  --danger: #C53B3B;
  --ink: #1E2933;
  --muted: #667481;
  --border: #DCE4EB;
  --shadow: 0 14px 40px rgba(18, 59, 102, .10);
}

* { box-sizing: border-box; }
body { background: var(--page-bg); color: var(--ink); font-family: "Segoe UI", Arial, sans-serif; letter-spacing: 0; }
a { color: var(--primary-mid); text-decoration: none; }
a:hover { color: var(--primary); }
.app-shell { min-height: 100vh; display: grid; grid-template-columns: 270px minmax(0, 1fr); }
.sidebar { position: sticky; top: 0; height: 100vh; background: var(--primary-dark); color: #fff; padding: 18px 14px; overflow-y: auto; }
.sidebar-brand { display: flex; align-items: center; gap: 12px; padding: 8px 10px 20px; border-bottom: 1px solid rgba(255,255,255,.12); margin-bottom: 14px; }
.sidebar-mark { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 8px; background: var(--primary-soft); color: var(--primary); }
.sidebar-brand strong { display: block; line-height: 1.1; }
.sidebar-brand span { display: block; color: #b9cde0; font-size: 12px; margin-top: 3px; }
.menu-group { margin: 8px 0; }
.menu-group-toggle { width: 100%; min-height: 42px; display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 10px 11px; border: 0; border-radius: 8px; background: transparent; color: #d8e5f1; font-weight: 800; text-align: left; }
.menu-group-toggle span { display: flex; align-items: center; gap: 10px; }
.menu-group-toggle:hover, .menu-group-toggle.active { background: rgba(255,255,255,.10); color: #fff; }
.menu-group-toggle .menu-group-chevron { width: 16px; height: 16px; transition: transform .18s ease; }
.menu-group-toggle[aria-expanded="true"] .menu-group-chevron { transform: rotate(180deg); }
.menu-group .collapse, .menu-group .collapsing { padding-left: 8px; }
.menu-title { padding: 14px 10px 6px; color: #95afc8; font-size: 11px; font-weight: 800; text-transform: uppercase; }
.menu-link { min-height: 42px; display: flex; align-items: center; gap: 10px; padding: 10px 11px; border-radius: 8px; color: #d8e5f1; margin: 3px 0; }
.menu-link:hover, .menu-link.active { background: rgba(255,255,255,.10); color: #fff; }
.menu-link.disabled { opacity: .52; pointer-events: none; }
.menu-link .badge { margin-left: auto; }
.app-main { min-width: 0; }
.topbar { min-height: 66px; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 12px 24px; background: rgba(255,255,255,.92); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 20; backdrop-filter: blur(12px); }
.page-content { padding: 24px; }
.page-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; margin-bottom: 20px; }
.page-title h1 { margin: 0; color: var(--primary-dark); font-size: 26px; }
.breadcrumb-text { color: var(--muted); font-size: 13px; margin-top: 5px; }
.card-soft { border: 1px solid var(--border); border-radius: 8px; box-shadow: var(--shadow); }
.stat-card { min-height: 128px; border: 1px solid var(--border); border-radius: 8px; background: #fff; box-shadow: var(--shadow); padding: 18px; }
.stat-card span { color: var(--muted); font-size: 13px; }
.stat-card strong { display: block; color: var(--primary); font-size: 30px; line-height: 1; margin-top: 10px; }
.btn-primary { background: var(--primary); border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); }
.table thead th { background: var(--primary-soft); color: var(--primary-dark); font-size: 12px; text-transform: uppercase; white-space: nowrap; }
.form-label { color: var(--primary-dark); font-weight: 700; }
.form-control, .form-select { border-color: var(--border); border-radius: 8px; }
.form-control:focus, .form-select:focus { border-color: var(--primary-mid); box-shadow: 0 0 0 .2rem rgba(31,93,145,.15); }
.notification-dot { position: absolute; top: 4px; right: 3px; width: 10px; height: 10px; border-radius: 50%; background: var(--danger); border: 2px solid #fff; }
.avatar { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 8px; background: var(--primary-soft); color: var(--primary); font-weight: 800; }
.empty-state { padding: 34px; text-align: center; color: var(--muted); }
.code-box { max-height: 240px; overflow: auto; background: #f7fafc; border: 1px solid var(--border); border-radius: 8px; padding: 12px; font-size: 12px; }

@media (max-width: 980px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { position: fixed; left: -280px; z-index: 40; width: 270px; transition: left .2s ease; }
  body.sidebar-open .sidebar { left: 0; }
  .page-content, .topbar { padding-left: 16px; padding-right: 16px; }
  .page-header { display: block; }
}