:root {
  --brand-bg: #eaf4fb;
  --brand-primary: #0d47a1;
  --brand-secondary: #1e88e5;
  --brand-light: #f8fafc;
}
html, body { height: 100%; }
body { background: var(--brand-light); }
.layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  grid-template-rows: 56px 1fr 40px;
  grid-template-areas:
    "sidebar header"
    "sidebar content"
    "sidebar footer";
  min-height: 100vh;
}
.sidebar {
  grid-area: sidebar;
  background: var(--brand-bg);
  color: #0f172a;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  transition: width .2s ease, transform .2s ease;
}
.sidebar .brand {
  display: flex;
  align-items: center;
  gap: 10px;
  height: 56px;
  padding: 0 16px;
  border-bottom: 1px solid rgba(255,255,255,.1);
  font-weight: 600;
}
.sidebar .menu {
  padding: 8px;
}
.sidebar .menu a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  margin: 4px 0;
  color: #0f3a69;
  text-decoration: none;
  border-radius: 8px;
}
.sidebar .menu a:hover { background: rgba(30,115,232,.08); color: #0b2d55; }
.sidebar .menu a.active {
  background: #fff;
  color: #1e88e5;
  box-shadow: 0 6px 16px rgba(0,0,0,.06);
  border-left: 4px solid #1e88e5;
}
.sidebar .menu .group-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 12px;
  margin: 8px 0 4px 0;
  border: 1px solid #e5e7eb;
  background: #ffffff;
  border-radius: 8px;
  color: #0f3a69;
  cursor: pointer;
}
.sidebar .menu .group-toggle .caret {
  transition: transform .2s ease;
}
.sidebar .menu .group-toggle.collapsed .caret {
  transform: rotate(-90deg);
}
.sidebar .menu .group-menu {
  margin: 4px 0 8px 0;
  padding-left: 6px;
  border-left: 2px solid #e5e7eb;
}
.sidebar .menu .group-menu.collapsed {
  display: none;
}
.header {
  grid-area: header;
  height: 56px;
  background: linear-gradient(90deg, #4da3ff 0%, #1e73e8 100%);
  border-bottom: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  position: sticky;
  top: 0;
  z-index: 10;
  color: #fff;
}
.header .btn-brand { background: rgba(255,255,255,.15); color: #fff; }
.header .btn-brand:hover { background: rgba(255,255,255,.25); }
.content { grid-area: content; padding: 16px; }
.footer {
  grid-area: footer;
  background: #fff;
  border-top: 1px solid #e5e7eb;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: #64748b;
}
.btn-brand {
  background: var(--brand-primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 8px 14px;
}
.btn-brand:hover { background: #0b3b86; }
.card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 16px;
}
.card-title { font-weight: 600; color: #0f172a; }
.grid {
  display: grid;
  gap: 16px;
}
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  overflow: hidden;
}
.table th, .table td {
  padding: 12px;
  border-bottom: 1px solid #e5e7eb;
  font-size: 14px;
}
.table th { background: #f1f5f9; text-align: left; color: #0f172a; }
.table tbody tr:hover { background: #f0f7ff; }
.badge { display: inline-block; padding: 4px 8px; border-radius: 999px; font-size: 12px; }
.badge.success { background: #d1fae5; color: #065f46; }
.badge.warning { background: #fff7ed; color: #9a3412; }
.actions { display: flex; gap: 8px; }
.sidebar-collapsed .sidebar { transform: translateX(-100%); }
@media (max-width: 1024px) {
  .layout {
    grid-template-columns: 1fr;
    grid-template-areas:
      "header"
      "content"
      "footer";
  }
  .sidebar { position: fixed; left: 0; width: 260px; transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
}
/* preview */
.preview-grid { margin-top: 8px; display: flex; gap: 8px; flex-wrap: wrap; }
.preview-thumb { width: 80px; height: 80px; object-fit: cover; border-radius: 8px; border: 1px solid #e5e7eb; background: #f8fafc; }

/* display mode switch */
.mode-switch { margin: 8px; padding: 8px; background: #ffffff; border: 1px solid #e5e7eb; border-radius: 8px; }
.mode-switch .title { font-size: 12px; font-weight: 600; color: #0f3a69; margin-bottom: 6px; }
.mode-switch .group { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.mode-switch .btn { padding: 6px 8px; border: 1px solid #e5e7eb; background: #f8fafc; border-radius: 8px; font-size: 12px; color: #0f3a69; text-align: center; cursor: pointer; }
.mode-switch .btn.active { background: #eaf4fb; border-color: #1e88e5; color: #1e88e5; }

/* forced responsive modes */
.mode-mobile .layout {
  grid-template-columns: 1fr;
  grid-template-areas:
    "header"
    "content"
    "footer";
}
.mode-mobile .sidebar { position: fixed; left: 0; width: 260px; transform: translateX(-100%); }
.mode-mobile .sidebar.open { transform: translateX(0); }
.mode-desktop .layout {
  grid-template-columns: 260px 1fr;
  grid-template-areas:
    "sidebar header"
    "sidebar content"
    "sidebar footer";
}
.mode-desktop .sidebar { position: sticky; transform: translateX(0); }