/* Structural frame shared by the Local and Cloud Homework adapters. */
.homework-app-shell { --homework-sidebar-width: 240px; display: flex; min-height: 100vh; background: var(--bg); }
.homework-app-sidebar { position: fixed; inset: 0 auto 0 0; z-index: 40; width: var(--homework-sidebar-width); height: 100vh; height: 100dvh; display: flex; flex-direction: column; overflow: hidden; background: var(--surface); border-right: 1px solid var(--border); transition: transform 180ms ease; }
.homework-app-sidebar .sidebar-brand, .homework-app-sidebar .hw-nav-workspace, .homework-app-sidebar > .sidebar-footer { flex: 0 0 auto; }
.homework-app-sidebar .sidebar-brand { min-height: 72px; padding: 0 24px; display: flex; align-items: center; border-bottom: 1px solid var(--border); }
.homework-app-sidebar .logo { display: flex; align-items: center; gap: 12px; }
.homework-app-sidebar .logo-mark { width: 36px; height: 36px; display: grid; place-items: center; border-radius: var(--radius-sm); background: var(--primary); color: #fff; font-size: 14px; font-weight: 700; }
.homework-app-sidebar .logo-mark img { display: block; width: 100%; height: 100%; border-radius: inherit; object-fit: contain; }
.homework-app-sidebar .logo-mark.has-image { border-radius: 0; background: transparent; }
.homework-app-sidebar .logo-mark.has-image img { border-radius: 0; }
.homework-app-sidebar .logo-text { color: var(--text); font-size: 16px; font-weight: 700; }
.homework-app-sidebar .hw-nav-workspace, .homework-app-header .hw-nav-workspace--toolbar { display: grid; grid-template-columns: 40px minmax(0, 1fr); align-items: center; gap: 10px; padding: 10px; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); }
.homework-app-sidebar .hw-nav-workspace { margin: 8px 12px 6px; }
.homework-app-header .hw-nav-workspace--toolbar { width: min(calc(var(--homework-sidebar-width) - 24px), 100%); flex: 0 1 calc(var(--homework-sidebar-width) - 24px); margin: 0; }
.homework-app-sidebar .hw-nav-workspace-icon, .homework-app-header .hw-nav-workspace--toolbar .hw-nav-workspace-icon { width: 40px; height: 40px; display: grid; place-items: center; overflow: hidden; border-radius: 10px; background: var(--primary-soft); }
.homework-app-sidebar .hw-nav-workspace-icon img, .homework-app-header .hw-nav-workspace--toolbar .hw-nav-workspace-icon img { display: block; width: 100%; height: 100%; object-fit: contain; }
.homework-app-sidebar .hw-nav-workspace-main, .homework-app-header .hw-nav-workspace--toolbar .hw-nav-workspace-main { min-width: 0; display: grid; gap: 2px; }
.homework-app-sidebar .hw-nav-workspace-control, .homework-app-header .hw-nav-workspace--toolbar .hw-nav-workspace-control { min-width: 0; }
.homework-app-sidebar .hw-nav-workspace-select { width: 100%; height: 32px; padding: 0 28px 0 8px; border: 0; border-radius: 6px; appearance: none; background: transparent url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236B7280' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E") no-repeat right 4px center; color: var(--text); font-size: 14px; font-weight: 700; cursor: pointer; }
.homework-app-sidebar .hw-nav-workspace-select:focus-visible { outline: 3px solid var(--primary-soft); outline-offset: 2px; background-color: var(--bg); }
.homework-app-sidebar .hw-nav-workspace .hw-class-picker-trigger, .homework-app-header .hw-nav-workspace--toolbar .hw-class-picker-trigger { width: 100%; min-height: 26px; justify-content: space-between; gap: 6px; padding: 0; border: 0; background: transparent; font-size: 14px; }
.homework-app-sidebar .hw-nav-workspace .hw-class-picker-trigger:hover, .homework-app-header .hw-nav-workspace--toolbar .hw-class-picker-trigger:hover { border-color: transparent; background: transparent; color: var(--primary); }
.homework-app-sidebar .hw-nav-workspace .hw-class-picker-trigger:disabled, .homework-app-header .hw-nav-workspace--toolbar .hw-class-picker-trigger:disabled { cursor: not-allowed; opacity: .65; }
.homework-app-sidebar .hw-nav-workspace .hw-class-picker-label, .homework-app-header .hw-nav-workspace--toolbar .hw-class-picker-label { min-width: 0; display: inline-flex; align-items: baseline; gap: 6px; }
.homework-app-sidebar .hw-nav-workspace .hw-class-picker-label strong, .homework-app-header .hw-nav-workspace--toolbar .hw-class-picker-label strong { font-size: 14px; }
.homework-app-sidebar .hw-nav-workspace .hw-class-picker-label small, .homework-app-header .hw-nav-workspace--toolbar .hw-class-picker-label small { color: var(--text-secondary); font-size: 11px; font-weight: 500; }
.homework-app-sidebar .homework-app-nav { flex: 1 1 auto; min-height: 0; overflow-y: auto; overscroll-behavior: contain; padding: 8px 12px 16px; display: flex; flex-direction: column; gap: 12px; }
.homework-app-nav .hw-nav-group { display: flex; flex-direction: column; gap: 1px; }
.homework-app-nav .hw-nav-group-label { display: block; padding: 10px 12px 4px; color: var(--text-muted); font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.homework-app-nav .nav-item { width: 100%; min-height: 36px; display: flex; align-items: center; gap: 10px; padding: 6px 12px; border-radius: var(--radius-sm); color: var(--text-secondary); font-size: 13px; font-weight: 600; text-decoration: none; }
.homework-app-nav .nav-item svg { width: 18px; height: 18px; flex: 0 0 auto; opacity: .85; }
.homework-app-nav .nav-item:hover, .homework-app-nav .nav-item.is-active { background: var(--primary-soft); color: var(--primary); }
.homework-app-nav .nav-item:focus-visible { outline: 3px solid var(--primary-soft); outline-offset: 2px; }
.homework-app-sidebar > .sidebar-footer { padding: 12px 16px 20px; border-top: 1px solid var(--border); }
.homework-app-main { min-width: 0; flex: 1; margin-left: var(--homework-sidebar-width); background: var(--content-background); transition: margin-left 180ms ease; }
.homework-app-shell.is-sidebar-collapsed .homework-app-sidebar { transform: translateX(-100%); }
.homework-app-shell.is-sidebar-collapsed .homework-app-main { margin-left: 0; }
.homework-sidebar-collapse-toggle { width: 42px; height: 42px; flex: 0 0 42px; display: inline-grid; place-items: center; margin-right: auto; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); color: var(--text); cursor: pointer; }
.homework-sidebar-collapse-toggle:hover { background: var(--primary-soft); color: var(--primary); }
.homework-sidebar-collapse-toggle:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; }
.homework-sidebar-collapse-toggle svg { width: 20px; height: 20px; }
.homework-app-menu-toggle { display: none; flex: 0 0 auto; width: 42px; height: 42px; margin-right: 12px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); color: var(--text); }
.homework-app-menu-toggle svg { width: 20px; height: 20px; }
.homework-sidebar-backdrop { display: none; position: fixed; inset: 0; z-index: 45; background: rgb(30 31 36 / 30%); opacity: 0; }
.homework-app-header { position: sticky; top: 0; z-index: 30; min-height: 72px; padding: 0 32px; display: flex; align-items: center; justify-content: flex-end; border-bottom: 1px solid var(--border); background: var(--surface); }
.homework-app-header .account-area { width: 100%; }
.homework-app-main .page-header { padding: 28px 32px 18px; }
.homework-app-main .page-header h1 { margin: 0; font-size: 26px; letter-spacing: -.03em; }
.homework-app-content { padding: 0 32px 48px; }
@media (max-width: 900px) {
  .homework-app-sidebar, .homework-app-shell.is-sidebar-collapsed .homework-app-sidebar { z-index: 50; transform: translateX(-100%); }
  .homework-app-sidebar.open { transform: translateX(0); }
  .homework-app-main, .homework-app-shell.is-sidebar-collapsed .homework-app-main { margin-left: 0; }
  .homework-sidebar-collapse-toggle { display: none; }
  .homework-sidebar-backdrop.open { display: block; opacity: 1; }
  .homework-app-menu-toggle { display: inline-grid; place-items: center; }
  .homework-app-header { min-height: 60px; padding: 0 16px; }
  .homework-app-main .page-header { padding: 20px 16px 12px; }
  .homework-app-content { padding: 0 16px 32px; }
}
@media (prefers-reduced-motion: reduce) { .homework-app-sidebar, .homework-app-main { transition: none; } }