:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --line: #dfe3e8;
  --text: #17202a;
  --muted: #657282;
  --primary: #0f766e;
  --primary-dark: #115e59;
  --danger: #b42318;
  --success-bg: #e8f6ef;
  --success-text: #166534;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: Arial, Helvetica, sans-serif; background: var(--bg); color: var(--text); }
a { color: var(--primary-dark); text-decoration: none; }
.app-shell { display: flex; min-height: 100vh; }
.sidebar { width: 280px; background: #111827; color: #f9fafb; padding: 18px; flex: 0 0 280px; }
.brand { display: grid; gap: 4px; padding-bottom: 18px; border-bottom: 1px solid rgba(255,255,255,.12); }
.brand span, .nav-layer, .nav-empty { color: #a7b0bd; font-size: 13px; }
.nav-group { margin-top: 18px; display: grid; gap: 8px; }
.nav-heading { font-weight: 700; }
.nav-layer { margin-top: 8px; text-transform: uppercase; font-size: 11px; letter-spacing: 0; }
.nav-tree a { display: block; color: #eef2f7; padding: 7px 8px; border-radius: 6px; }
.nav-tree a:hover { background: rgba(255,255,255,.08); }
.main-shell { flex: 1; min-width: 0; }
.topbar { height: 56px; background: var(--panel); border-bottom: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; padding: 0 22px; gap: 16px; }
.menu-button { display: none; }
.content { padding: 24px; max-width: 1240px; }
.page-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 18px; }
h1 { margin: 0; font-size: 28px; line-height: 1.2; }
.eyebrow { margin: 0 0 4px; color: var(--muted); font-size: 13px; }
.toolbar, .form-actions, .action-row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.toolbar { margin-bottom: 14px; }
.field, input[type="search"], select, textarea { width: 100%; border: 1px solid var(--line); border-radius: 6px; min-height: 38px; padding: 8px 10px; background: white; color: var(--text); }
.toolbar input[type="search"] { max-width: 320px; }
.toolbar select { max-width: 160px; }
.button, button { border: 1px solid var(--line); border-radius: 6px; min-height: 36px; padding: 8px 13px; background: white; color: var(--text); cursor: pointer; display: inline-flex; align-items: center; }
.button.primary { background: var(--primary); border-color: var(--primary); color: white; }
.button.primary:hover { background: var(--primary-dark); }
.button.danger { color: var(--danger); border-color: #f0b4ad; }
.link-button { border: 0; background: transparent; color: var(--primary-dark); padding: 0; }
.table-wrap, .form-panel, .detail-grid, .empty-state { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; }
.dashboard-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; margin-bottom: 18px; }
.summary-panel { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 16px; display: grid; gap: 6px; }
.summary-panel span { color: var(--muted); font-size: 13px; }
.summary-panel strong { font-size: 17px; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 11px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 0; }
tr:last-child td { border-bottom: 0; }
.actions { text-align: right; white-space: nowrap; }
.icon-link { margin-left: 8px; }
.badge { border-radius: 999px; padding: 3px 8px; font-size: 12px; }
.badge.success { background: var(--success-bg); color: var(--success-text); }
.badge.muted { background: #eef0f3; color: var(--muted); }
.empty, .empty-state { color: var(--muted); text-align: center; padding: 28px; }
.pagination { margin-top: 12px; display: flex; gap: 12px; align-items: center; color: var(--muted); }
.form-panel { padding: 18px; display: grid; gap: 16px; max-width: 820px; }
.grid.two { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
label { display: grid; gap: 6px; font-weight: 600; }
.checkbox { display: flex; gap: 8px; align-items: center; align-self: end; }
.error { color: var(--danger); font-size: 13px; }
.detail-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; overflow: hidden; }
.detail-grid div { padding: 14px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); display: grid; gap: 5px; }
.detail-grid span { color: var(--muted); font-size: 13px; }
.detail-grid .wide { grid-column: span 4; }
.flash-stack { display: grid; gap: 8px; margin-bottom: 16px; }
.flash { padding: 10px 12px; border-radius: 6px; border: 1px solid var(--line); background: white; }
.flash.success { border-color: #bbf7d0; background: #f0fdf4; }
.flash.danger { border-color: #fecaca; background: #fef2f2; }
.auth-page { min-height: 100vh; display: grid; place-items: center; background: #eef2f7; }
.login-panel { width: min(420px, calc(100vw - 32px)); background: white; border: 1px solid var(--line); border-radius: 8px; padding: 24px; }
.login-panel form { display: grid; gap: 14px; }
@media (max-width: 860px) {
  .sidebar { position: fixed; inset: 0 auto 0 0; transform: translateX(-100%); transition: transform .2s ease; z-index: 10; }
  .sidebar.open { transform: translateX(0); }
  .menu-button { display: inline-flex; }
  .content { padding: 16px; }
  .grid.two, .detail-grid, .dashboard-grid { grid-template-columns: 1fr; }
  .detail-grid .wide { grid-column: span 1; }
  .page-header { align-items: flex-start; flex-direction: column; }
}