/* Assessment Studio dashboard system: primitive -> semantic -> component tokens. */
:root {
  /* Primitive color tokens */
  --primitive-white: #ffffff;
  --primitive-slate-25: #f8fafc;
  --primitive-slate-50: #f3f6fa;
  --primitive-slate-100: #e8edf4;
  --primitive-slate-200: #d6dee9;
  --primitive-slate-400: #8190a5;
  --primitive-slate-600: #506077;
  --primitive-slate-800: #243146;
  --primitive-slate-950: #121b2b;
  --primitive-cobalt-50: #edf3ff;
  --primitive-cobalt-100: #dbe6ff;
  --primitive-cobalt-600: #315ed4;
  --primitive-cobalt-700: #274bb8;
  --primitive-green-50: #eaf7f1;
  --primitive-green-700: #267255;
  --primitive-amber-50: #fff5df;
  --primitive-amber-700: #8b5b18;
  --primitive-red-50: #fff0ee;
  --primitive-red-700: #a64242;

  /* Primitive space, shape, motion, and elevation tokens */
  --primitive-space-1: .25rem;
  --primitive-space-2: .5rem;
  --primitive-space-3: .75rem;
  --primitive-space-4: 1rem;
  --primitive-space-5: 1.25rem;
  --primitive-space-6: 1.5rem;
  --primitive-space-8: 2rem;
  --primitive-space-10: 2.5rem;
  --primitive-radius-sm: .625rem;
  --primitive-radius-md: .875rem;
  --primitive-radius-lg: 1.25rem;
  --primitive-radius-xl: 1.75rem;
  --primitive-shadow-sm: 0 8px 24px rgba(35, 55, 88, .07);
  --primitive-shadow-md: 0 22px 58px rgba(35, 55, 88, .11);
  --primitive-ease: cubic-bezier(.22, 1, .36, 1);
  --primitive-duration: 220ms;
  --z-base: 0;
  --z-sticky: 20;
  --z-nav: 40;
  --z-overlay: 70;
  --z-toast: 90;

  /* Semantic aliases */
  --surface-canvas: var(--primitive-slate-50);
  --surface-card: var(--primitive-white);
  --surface-subtle: var(--primitive-slate-25);
  --surface-accent: var(--primitive-cobalt-50);
  --text-strong: var(--primitive-slate-950);
  --text-body: var(--primitive-slate-800);
  --text-muted: var(--primitive-slate-600);
  --border-subtle: var(--primitive-slate-200);
  --action-primary: var(--primitive-cobalt-600);
  --action-primary-hover: var(--primitive-cobalt-700);
  --focus-ring: rgba(49, 94, 212, .22);
  --status-success-bg: var(--primitive-green-50);
  --status-success-text: var(--primitive-green-700);
  --status-warning-bg: var(--primitive-amber-50);
  --status-warning-text: var(--primitive-amber-700);
  --status-danger-bg: var(--primitive-red-50);
  --status-danger-text: var(--primitive-red-700);

  /* Compatibility aliases consumed by the existing application. */
  --bg: var(--surface-canvas);
  --card: var(--surface-card);
  --ink: var(--text-strong);
  --muted: var(--text-muted);
  --line: var(--border-subtle);
  --primary: var(--action-primary);
  --primary-2: var(--action-primary-hover);
  --soft: var(--surface-accent);
  --shadow: var(--primitive-shadow-md);

  /* Component tokens */
  --sidebar-expanded: 17.5rem;
  --sidebar-collapsed: 5.25rem;
  --sidebar-bg: rgba(255, 255, 255, .94);
  --card-radius: var(--primitive-radius-lg);
  --card-padding: var(--primitive-space-6);
  --control-height: 2.75rem;
  --workspace-max: 100rem;
  --icon-size: 1.25rem;
  --icon-size-sm: 1rem;
  --icon-size-lg: 1.5rem;
}

html { background: var(--surface-canvas); color: var(--text-body); font-family: Geist, "Avenir Next", Avenir, "Segoe UI Variable", "Segoe UI", system-ui, -apple-system, sans-serif; }
body { min-width: 20rem; overflow-x: clip; background-color: var(--surface-canvas); background-image: radial-gradient(circle at 1px 1px, rgba(61, 82, 118, .075) 1px, transparent 0); background-size: 1.35rem 1.35rem; }
body::before { content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none; background: radial-gradient(circle at 74% 0%, rgba(219, 230, 255, .8), transparent 34rem); }
.ambient { display: none; }
button, a, input, select, textarea { -webkit-tap-highlight-color: transparent; }
a, button { transition: color var(--primitive-duration) var(--primitive-ease), background-color var(--primitive-duration) var(--primitive-ease), border-color var(--primitive-duration) var(--primitive-ease), opacity var(--primitive-duration) var(--primitive-ease), transform var(--primitive-duration) var(--primitive-ease); }
.ui-icon { display: inline-block; width: var(--icon-size); height: var(--icon-size); flex: 0 0 auto; overflow: visible; color: inherit; vertical-align: -.18em; }
.ui-icon-sm { width: var(--icon-size-sm); height: var(--icon-size-sm); }
.ui-icon-lg { width: var(--icon-size-lg); height: var(--icon-size-lg); }
.icon-label, .primary-btn, .ghost-btn, .danger-btn, .danger-link, .text-btn { align-items: center; gap: .5rem; }
.icon-label { display: inline-flex; }
.icon-only { display: inline-grid; place-items: center; }
.icon-only .ui-icon, .modal-close .ui-icon { width: var(--icon-size-sm); height: var(--icon-size-sm); }
.empty-state > .ui-icon { width: 2.75rem; height: 2.75rem; color: var(--action-primary); }
.integrity-event-icon .ui-icon { width: 1.15rem; height: 1.15rem; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible { outline: 3px solid var(--focus-ring); outline-offset: 2px; }
.skip-link { position: fixed; top: .75rem; left: .75rem; z-index: calc(var(--z-toast) + 1); padding: .75rem 1rem; border-radius: var(--primitive-radius-sm); background: var(--text-strong); color: var(--primitive-white); text-decoration: none; transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }
#main-content:focus { outline: none; }
.toast-stack { z-index: var(--z-toast); }
.primary-btn, .ghost-btn, .danger-btn, .submit-btn { min-height: var(--control-height); border-radius: var(--primitive-radius-md); font-weight: 750; }
.primary-btn { background: var(--action-primary); box-shadow: 0 8px 18px rgba(49, 94, 212, .16); }
.primary-btn:hover { background: var(--action-primary-hover); transform: translateY(-1px); }
.ghost-btn { border: 1px solid var(--border-subtle); background: var(--surface-card); }
.ghost-btn:hover { border-color: var(--primitive-slate-400); background: var(--surface-subtle); }
.primary-btn:active, .ghost-btn:active, .danger-btn:active { transform: translateY(1px); }
.eyebrow { margin: 0 0 .45rem; color: var(--action-primary); font-size: .68rem; font-weight: 800; letter-spacing: .13em; text-transform: uppercase; }
h1, h2, h3 { color: var(--text-strong); text-wrap: balance; }
p { text-wrap: pretty; }

/* Teacher application shell */
.teacher-shell { width: min(var(--workspace-max), 100%); margin: 0 auto; padding: var(--primitive-space-6); }
.teacher-shell-grid { display: grid; grid-template-columns: var(--sidebar-expanded) minmax(0, 1fr); gap: var(--primitive-space-6); align-items: start; }
.teacher-workspace { display: grid; min-width: 0; gap: var(--primitive-space-6); padding-bottom: var(--primitive-space-8); }
.app-sidebar { position: sticky; top: var(--primitive-space-6); display: grid; grid-template-rows: auto minmax(0, 1fr) auto; align-self: start; height: calc(100dvh - 3rem); min-width: 0; overflow: hidden; border: 1px solid rgba(214, 222, 233, .92); border-radius: var(--primitive-radius-xl); background: var(--sidebar-bg); box-shadow: var(--primitive-shadow-md); }
.sidebar-brand-row { display: flex; align-items: center; justify-content: space-between; gap: .5rem; padding: 1rem; border-bottom: 1px solid var(--border-subtle); }
.sidebar-brand { display: flex; min-width: 0; align-items: center; gap: .7rem; color: var(--text-strong); text-decoration: none; }
.sidebar-brand-mark { display: grid; width: 2.4rem; height: 2.4rem; flex: 0 0 auto; place-items: center; border-radius: .8rem; background: var(--text-strong); color: var(--primitive-white); font-size: .72rem; font-weight: 850; letter-spacing: .04em; }
.sidebar-brand-copy, .sidebar-account-copy { display: grid; min-width: 0; gap: .1rem; }
.sidebar-brand-copy strong, .sidebar-account-copy strong { overflow: hidden; font-size: .82rem; text-overflow: ellipsis; white-space: nowrap; }
.sidebar-brand-copy small, .sidebar-account-copy small { color: var(--text-muted); font-size: .65rem; }
.sidebar-collapse { display: grid; width: 2.4rem; height: 2.4rem; flex: 0 0 auto; place-items: center; border: 1px solid var(--border-subtle); border-radius: .75rem; background: var(--surface-card); color: var(--text-muted); cursor: pointer; font-size: 1.35rem; }
.sidebar-collapse:hover { color: var(--action-primary); background: var(--surface-accent); }
.sidebar-scroll { display: grid; align-content: start; gap: 1.25rem; min-height: 0; overflow-y: auto; padding: 1rem .75rem; scrollbar-width: thin; }
.sidebar-section { display: grid; gap: .35rem; }
.sidebar-label { margin: 0; padding: 0 .65rem .25rem; color: var(--text-muted); font-size: .62rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.sidebar-link { display: grid; grid-template-columns: 2.3rem minmax(0, 1fr); align-items: center; gap: .7rem; min-height: 3.2rem; padding: .45rem .6rem; border: 1px solid transparent; border-radius: var(--primitive-radius-md); color: var(--text-body); text-decoration: none; }
.sidebar-link:hover { border-color: var(--border-subtle); background: var(--surface-subtle); transform: translateX(2px); }
.sidebar-link.is-active, .sidebar-link[aria-current="page"] { border-color: var(--primitive-cobalt-100); background: var(--surface-accent); color: var(--action-primary-hover); }
.sidebar-icon { display: grid; width: 2.25rem; height: 2.25rem; place-items: center; border-radius: .7rem; background: var(--primitive-slate-100); }
.sidebar-icon .ui-icon { width: 1.3rem; height: 1.3rem; }
.sidebar-link.is-active .sidebar-icon { background: var(--action-primary); color: var(--primitive-white); }
.sidebar-link > span:last-child { display: grid; min-width: 0; gap: .1rem; }
.sidebar-link strong { font-size: .78rem; }
.sidebar-link small { overflow: hidden; color: var(--text-muted); font-size: .64rem; text-overflow: ellipsis; white-space: nowrap; }
.sidebar-account { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: .65rem; margin: .75rem; padding: .7rem; border: 1px solid var(--border-subtle); border-radius: var(--primitive-radius-md); background: var(--surface-subtle); }
.sidebar-avatar { display: grid; width: 2.25rem; height: 2.25rem; place-items: center; border-radius: .7rem; background: var(--primitive-cobalt-100); color: var(--action-primary-hover); font-size: .75rem; font-weight: 850; }
.sidebar-account-link { display: grid; width: 2rem; height: 2rem; place-items: center; border-radius: .6rem; color: var(--text-muted); text-decoration: none; }
.sidebar-account-link:hover { background: var(--surface-card); color: var(--action-primary); }
.sidebar-footer { display: grid; }
.sidebar-logout { margin: 0 .75rem .75rem; }
.sidebar-logout button { display: inline-flex; width: 100%; min-height: 2.5rem; align-items: center; justify-content: center; gap: .45rem; border: 1px solid var(--border-subtle); border-radius: .75rem; background: var(--surface-card); color: var(--text-muted); cursor: pointer; font-size: .72rem; font-weight: 750; }
.sidebar-logout button:hover { background: var(--surface-subtle); color: var(--text-strong); }
.mobile-app-bar, .mobile-bottom-nav, .mobile-more-layer { display: none; }

body.sidebar-is-collapsed .teacher-shell-grid { grid-template-columns: var(--sidebar-collapsed) minmax(0, 1fr); }
body.sidebar-is-collapsed .sidebar-brand-copy, body.sidebar-is-collapsed .sidebar-label, body.sidebar-is-collapsed .sidebar-link > span:last-child, body.sidebar-is-collapsed .sidebar-account-copy, body.sidebar-is-collapsed .sidebar-account-link { display: none; }
body.sidebar-is-collapsed .sidebar-brand-row { display: grid; justify-items: center; }
body.sidebar-is-collapsed .sidebar-brand { justify-content: center; }
body.sidebar-is-collapsed .sidebar-collapse { transform: rotate(180deg); }
body.sidebar-is-collapsed .sidebar-link { grid-template-columns: 1fr; justify-items: center; padding-inline: .35rem; }
body.sidebar-is-collapsed .sidebar-account { grid-template-columns: 1fr; justify-items: center; }
body.sidebar-is-collapsed .sidebar-logout { display: none; }

/* Shared page and data components */
.page-header, .teacher-header { display: flex; align-items: flex-end; justify-content: space-between; gap: var(--primitive-space-6); margin: 0; padding: .35rem 0 .5rem; }
.page-header > div:first-child, .teacher-header > div:first-child { max-width: 48rem; }
.page-header h1, .teacher-header h1 { margin: 0; font-size: clamp(1.75rem, 3vw, 2.5rem); line-height: 1.05; letter-spacing: -.045em; }
.page-header p:last-child, .teacher-header p:last-child { max-width: 64ch; margin: .65rem 0 0; color: var(--text-muted); line-height: 1.6; }
.teacher-actions { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: .5rem; }
.teacher-actions form { margin: 0; }
.kpi-grid { display: grid; grid-template-columns: 1.3fr repeat(3, 1fr); gap: .75rem; }
.kpi-card { display: grid; min-width: 0; gap: .35rem; padding: 1.25rem; border: 1px solid var(--border-subtle); border-radius: var(--card-radius); background: var(--surface-card); box-shadow: var(--primitive-shadow-sm); }
.kpi-card-featured { border-color: var(--primitive-cobalt-100); background: var(--surface-accent); }
.kpi-card > span { color: var(--text-muted); font-size: .68rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; }
.kpi-card > strong { color: var(--text-strong); font-size: clamp(1.65rem, 3vw, 2.25rem); font-variant-numeric: tabular-nums; letter-spacing: -.05em; line-height: 1; }
.kpi-card > small { color: var(--text-muted); font-size: .72rem; line-height: 1.4; }
.kpi-icon { justify-self: end; margin-bottom: -.2rem; color: var(--action-primary); }
.dashboard-bento { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: .75rem; }
.bento-card { display: grid; min-width: 0; gap: 1.2rem; padding: var(--card-padding); border: 1px solid var(--border-subtle); border-radius: var(--primitive-radius-xl); background: var(--surface-card); box-shadow: var(--primitive-shadow-sm); }
.bento-card h2, .content-section h2 { margin: 0; font-size: 1.15rem; letter-spacing: -.025em; }
.bento-card p:not(.eyebrow) { margin: .45rem 0 0; color: var(--text-muted); font-size: .84rem; line-height: 1.55; }
.bento-performance { grid-column: span 7; }
.bento-integrity { grid-column: span 5; align-content: space-between; background: var(--primitive-slate-950); }
.bento-integrity h2, .bento-integrity .integrity-number strong { color: var(--primitive-white); }
.bento-integrity p:not(.eyebrow), .bento-integrity .integrity-number span, .bento-integrity dt { color: #b8c4d5; }
.bento-resources { grid-column: span 8; }
.bento-export { grid-column: span 4; align-content: space-between; background: var(--surface-accent); }
.card-heading { display: flex; align-items: start; justify-content: space-between; gap: 1rem; }
.data-chip { display: inline-flex; width: max-content; max-width: 100%; align-items: center; padding: .45rem .7rem; border-radius: 999px; background: var(--primitive-slate-100); color: var(--text-muted); font-size: .7rem; font-weight: 750; white-space: nowrap; }
.distribution-list { display: grid; gap: .9rem; }
.distribution-list > div { display: grid; grid-template-columns: minmax(6.5rem, .7fr) minmax(8rem, 2fr) 2rem; align-items: center; gap: .75rem; }
.distribution-list span { display: grid; gap: .1rem; }
.distribution-list strong, .distribution-list b { color: var(--text-body); font-size: .75rem; font-variant-numeric: tabular-nums; }
.distribution-list small { color: var(--text-muted); font-size: .65rem; }
.meter { height: .55rem; overflow: hidden; border-radius: 999px; background: var(--primitive-slate-100); }
.meter i { display: block; width: var(--meter-value); height: 100%; border-radius: inherit; background: var(--action-primary); }
.meter i.meter-alert { background: #bb6a45; }
.integrity-number { display: grid; gap: .2rem; }
.integrity-number strong { font-size: 3.2rem; font-variant-numeric: tabular-nums; letter-spacing: -.06em; line-height: 1; }
.compact-data { display: grid; grid-template-columns: 1fr 1fr; gap: .55rem; margin: 0; }
.compact-data div { display: grid; gap: .15rem; padding: .8rem; border: 1px solid rgba(255, 255, 255, .12); border-radius: var(--primitive-radius-md); background: rgba(255, 255, 255, .06); }
.compact-data dt { font-size: .65rem; }
.compact-data dd { margin: 0; color: var(--primitive-white); font-size: 1.2rem; font-weight: 800; font-variant-numeric: tabular-nums; }
.resource-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: .6rem; }
.resource-grid a { display: grid; grid-template-columns: auto 1fr; gap: .3rem .65rem; align-items: center; padding: 1rem; border-radius: var(--primitive-radius-md); background: var(--surface-subtle); color: var(--text-muted); text-decoration: none; }
.resource-grid a .ui-icon { grid-row: span 2; color: var(--action-primary); }
.resource-grid a:hover { background: var(--surface-accent); transform: translateY(-2px); }
.resource-grid strong { color: var(--text-strong); font-size: 1.55rem; font-variant-numeric: tabular-nums; }
.resource-grid span { font-size: .7rem; font-weight: 700; }
.button-row { display: flex; flex-wrap: wrap; gap: .5rem; }
.content-section { display: grid; gap: .85rem; margin-top: .25rem; }
.section-title-row { display: flex; align-items: end; justify-content: space-between; gap: 1rem; margin: 0; }
.filter-card { margin: 0; padding: 1rem; border: 1px solid var(--border-subtle); border-radius: var(--card-radius); background: var(--surface-card); box-shadow: var(--primitive-shadow-sm); }
.table-card, .setup-card, .composition-card, .editor-card, .exam-detail-section, .exam-danger-zone, .catalog-item, .bank-question-card, .student-card, .section-chip-card, .exam-manager-card, .version-card, .teacher-user-card { border-color: var(--border-subtle); border-radius: var(--card-radius); background: var(--surface-card); box-shadow: var(--primitive-shadow-sm); }
.table-card { border: 1px solid var(--border-subtle); }
.table-scroll { scrollbar-width: thin; }
table { font-variant-numeric: tabular-nums; }
th { background: var(--surface-subtle); color: var(--text-muted); font-size: .65rem; letter-spacing: .06em; }
td { border-color: var(--primitive-slate-100); }
.empty-state { background: var(--surface-card); }

/* Responsive roster tables: semantic tables on desktop, labeled records below desktop. */
.roster-data-section { display: grid; min-width: 0; gap: .8rem; }
.roster-table-frame { max-width: 100%; overflow: auto; border: 1px solid var(--border-subtle); border-radius: var(--card-radius); background: var(--surface-card); scrollbar-width: thin; }
.roster-table { width: 100%; border-collapse: separate; border-spacing: 0; table-layout: fixed; }
.roster-table th, .roster-table td { padding: .8rem .85rem; border-bottom: 1px solid var(--primitive-slate-100); text-align: left; vertical-align: middle; overflow-wrap: anywhere; }
.roster-table thead th { padding-block: .7rem; background: var(--surface-subtle); color: var(--text-muted); font-size: .64rem; font-weight: 850; letter-spacing: .075em; text-transform: uppercase; }
.roster-table tbody th { background: transparent; color: var(--text-body); font-weight: 700; letter-spacing: normal; }
.roster-table tbody tr:last-child > * { border-bottom: 0; }
.roster-table tbody tr { transition: background-color var(--primitive-duration) var(--primitive-ease); }
.roster-table tbody tr:hover { background: rgba(237, 243, 255, .42); }
.roster-table tbody tr.is-inactive { background: var(--surface-subtle); color: var(--text-muted); }
.roster-table tbody tr.is-inactive .roster-avatar { filter: grayscale(.7); opacity: .72; }
.sections-table th:nth-child(1) { width: 22%; }
.sections-table th:nth-child(2) { width: 38%; }
.sections-table th:nth-child(3), .sections-table th:nth-child(4) { width: 10%; }
.sections-table th:nth-child(5) { width: 20%; }
.students-table th:nth-child(1) { width: 21%; }
.students-table th:nth-child(2) { width: 11%; }
.students-table th:nth-child(3) { width: 10%; }
.students-table th:nth-child(4) { width: 17%; }
.students-table th:nth-child(5) { width: 9%; }
.students-table th:nth-child(6) { width: 14%; }
.students-table th:nth-child(7) { width: 18%; }
.numeric-heading, .numeric-cell { text-align: right !important; font-variant-numeric: tabular-nums; }
.numeric-cell strong { color: var(--text-strong); font-size: .92rem; }
.actions-heading { text-align: right !important; }
.roster-primary-text, .roster-cell-value { display: block; color: var(--text-strong); font-size: .78rem; line-height: 1.35; }
.roster-secondary-text, .roster-notes { color: var(--text-muted); font-size: .74rem; line-height: 1.45; }
.roster-code { color: var(--text-body); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .72rem; font-variant-numeric: tabular-nums; }
.roster-identity { display: flex; min-width: 0; align-items: center; gap: .65rem; }
.roster-identity > span:last-child { display: grid; min-width: 0; gap: .15rem; }
.roster-identity small { overflow: hidden; color: var(--text-muted); font-size: .69rem; font-weight: 500; text-overflow: ellipsis; white-space: nowrap; }
.roster-avatar { display: grid; width: 2.25rem; height: 2.25rem; flex: 0 0 auto; place-items: center; border-radius: .72rem; background: var(--primitive-cobalt-100); color: var(--action-primary-hover); font-size: .72rem; font-weight: 850; }
.roster-table .account-state { display: inline-flex; width: fit-content; max-width: 100%; margin: 0; flex-wrap: wrap; justify-content: flex-start; gap: .2rem .45rem; padding: .38rem .55rem; }
.roster-table .account-state small { text-align: left; }
.roster-table .status-dot { display: inline-flex; width: fit-content; margin: 0; white-space: nowrap; }
.roster-actions-cell { text-align: right !important; }
.roster-row-actions { display: flex; align-items: center; justify-content: flex-end; gap: .35rem; flex-wrap: wrap; }
.roster-row-actions form { margin: 0; }
.roster-row-actions .compact { min-height: 2.25rem; padding-inline: .65rem; font-size: .7rem; }

/* Student dashboard */
.student-home-shell { width: min(76rem, calc(100% - 2rem)); margin: 0 auto; padding: 1.5rem 0 3rem; }
.student-home-topbar { margin-bottom: 1rem; padding: 0; border: 0; background: transparent; box-shadow: none; }
.student-brand { display: flex; align-items: center; gap: 1rem; }
.student-brand .brand-mark { margin: 0; }
.student-account-actions { display: flex; gap: .5rem; }
.student-account-actions form { margin: 0; }
.student-dashboard-grid { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(18rem, .8fr); grid-template-rows: auto auto; gap: .75rem; }
.student-welcome-card, .student-next-card, .student-profile-card { border: 1px solid var(--border-subtle); border-radius: var(--primitive-radius-xl); background: var(--surface-card); box-shadow: var(--primitive-shadow-sm); }
.student-welcome-card { grid-row: span 2; display: flex; min-height: 21rem; align-items: end; justify-content: space-between; gap: 2rem; padding: 2rem; background-color: var(--primitive-slate-950); background-image: radial-gradient(circle at 80% 20%, rgba(49, 94, 212, .5), transparent 16rem); }
.student-welcome-card h2 { max-width: 12ch; margin: 0; color: var(--primitive-white); font-size: clamp(2.2rem, 5vw, 4.25rem); line-height: .95; letter-spacing: -.065em; }
.student-welcome-card p:not(.eyebrow) { max-width: 46ch; margin: 1rem 0 0; color: #bdc8d8; line-height: 1.65; }
.student-progress-ring { --progress: 0%; display: grid; width: 7.5rem; height: 7.5rem; flex: 0 0 auto; place-items: center; border-radius: 50%; background: conic-gradient(var(--primitive-cobalt-600) var(--progress), rgba(255, 255, 255, .13) 0); }
.student-progress-ring::before { content: ""; grid-area: 1 / 1; width: 5.8rem; height: 5.8rem; border-radius: 50%; background: var(--primitive-slate-950); }
.student-progress-ring span { z-index: 1; display: grid; grid-area: 1 / 1; text-align: center; }
.student-progress-ring strong { color: var(--primitive-white); font-size: 1.45rem; font-variant-numeric: tabular-nums; }
.student-progress-ring small { color: #bdc8d8; font-size: .65rem; }
.student-next-card { display: grid; align-content: start; gap: .65rem; padding: 1.4rem; }
.student-next-card h2 { margin: 0; font-size: 1.2rem; }
.student-next-card p:not(.eyebrow) { margin: 0; color: var(--text-muted); font-size: .82rem; line-height: 1.5; }
.student-next-card form, .student-next-card .primary-btn { width: 100%; }
.student-profile-card { display: grid; grid-template-columns: auto minmax(0, 1fr); align-items: center; gap: .8rem; padding: 1rem 1.2rem; }
.student-profile-avatar { display: grid; width: 2.7rem; height: 2.7rem; place-items: center; border-radius: .85rem; background: var(--primitive-cobalt-100); color: var(--action-primary-hover); font-weight: 850; }
.student-profile-card div { display: grid; min-width: 0; gap: .12rem; }
.student-profile-card strong, .student-profile-card span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.student-profile-card small, .student-profile-card div span { color: var(--text-muted); font-size: .7rem; }
.student-kpis { grid-template-columns: repeat(5, minmax(0, 1fr)); margin: .75rem 0 1.5rem; }
.student-exam-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.student-exam-card { min-width: 0; border-radius: var(--card-radius); }

/* Tablet: permanent compact rail, never stacked above the workspace. */
@media (min-width: 768px) and (max-width: 1119px) {
  .teacher-shell { padding: 1rem; }
  .teacher-shell-grid, body.sidebar-is-collapsed .teacher-shell-grid { grid-template-columns: var(--sidebar-collapsed) minmax(0, 1fr); gap: 1rem; }
  .app-sidebar { top: 1rem; height: calc(100dvh - 2rem); }
  .sidebar-brand-row { display: grid; justify-items: center; }
  .sidebar-brand-copy, .sidebar-label, .sidebar-link > span:last-child, .sidebar-account-copy, .sidebar-account-link, .sidebar-collapse, .sidebar-logout { display: none; }
  .sidebar-brand { justify-content: center; }
  .sidebar-link { grid-template-columns: 1fr; justify-items: center; padding-inline: .35rem; }
  .sidebar-account { grid-template-columns: 1fr; justify-items: center; }
  .kpi-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .bento-performance, .bento-integrity, .bento-resources, .bento-export { grid-column: span 6; }
  .resource-grid { grid-template-columns: repeat(2, 1fr); }
  .student-exam-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .roster-table tbody { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 1119px) {
  .integrity-review-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .roster-table-frame { overflow: visible; border: 0; border-radius: 0; background: transparent; }
  .roster-table, .roster-table tbody { display: block; width: 100%; }
  .roster-table thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap; }
  .roster-table tbody { display: grid; gap: .75rem; }
  .roster-table tbody tr { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); min-width: 0; overflow: hidden; border: 1px solid var(--border-subtle); border-radius: var(--card-radius); background: var(--surface-card); box-shadow: var(--primitive-shadow-sm); }
  .roster-table tbody tr.is-inactive { background: var(--surface-subtle); }
  .roster-table tbody tr:hover { background: var(--surface-card); }
  .roster-table tbody tr.is-inactive:hover { background: var(--surface-subtle); }
  .roster-table th, .roster-table td { display: grid; grid-template-columns: minmax(6.5rem, .45fr) minmax(0, 1fr); gap: .6rem; align-items: start; padding: .65rem .8rem; border: 0; text-align: left !important; }
  .roster-table th::before, .roster-table td::before { content: attr(data-label); color: var(--text-muted); font-size: .62rem; font-weight: 850; letter-spacing: .065em; line-height: 1.35; text-transform: uppercase; }
  .roster-table tbody th, .roster-table .roster-notes, .roster-table .roster-actions-cell { grid-column: 1 / -1; }
  .roster-table tbody th { padding-top: .9rem; padding-bottom: .8rem; border-bottom: 1px solid var(--primitive-slate-100); }
  .roster-table .numeric-cell { font-variant-numeric: tabular-nums; }
  .roster-table .roster-actions-cell { margin-top: .15rem; padding-block: .75rem .85rem; border-top: 1px solid var(--primitive-slate-100); background: var(--surface-subtle); }
  .roster-row-actions { justify-content: flex-start; }
  .roster-row-actions .compact { min-height: 2.75rem; }
}

/* Mobile: dedicated app bar, five-item bottom navigation, and modal More sheet. */
@media (max-width: 767px) {
  :root { --card-padding: 1.15rem; }
  body { background-size: 1.1rem 1.1rem; }
  body.mobile-sheet-open { overflow: hidden; }
  .teacher-shell { width: 100%; padding: 0 .75rem calc(6.5rem + env(safe-area-inset-bottom)); }
  .teacher-shell-grid { display: block; }
  .app-sidebar { display: none; }
  .mobile-app-bar { position: sticky; top: 0; z-index: var(--z-sticky); display: flex; min-height: 3.8rem; align-items: center; justify-content: space-between; gap: .75rem; margin: 0 -.75rem 1rem; padding: .6rem .85rem; border-bottom: 1px solid rgba(214, 222, 233, .9); background: rgba(243, 246, 250, .94); backdrop-filter: blur(14px); }
  .mobile-brand { display: flex; min-width: 0; align-items: center; gap: .55rem; color: var(--text-strong); text-decoration: none; }
  .mobile-brand span { display: grid; width: 2rem; height: 2rem; place-items: center; border-radius: .65rem; background: var(--text-strong); color: var(--primitive-white); font-size: .62rem; font-weight: 850; }
  .mobile-brand strong { overflow: hidden; font-size: .8rem; text-overflow: ellipsis; white-space: nowrap; }
  .mobile-user { max-width: 7.5rem; overflow: hidden; color: var(--text-muted); font-size: .7rem; font-weight: 700; text-overflow: ellipsis; white-space: nowrap; }
  .mobile-bottom-nav { position: fixed; right: .6rem; bottom: max(.5rem, env(safe-area-inset-bottom)); left: .6rem; z-index: var(--z-nav); display: grid; grid-template-columns: repeat(5, 1fr); padding: .35rem; border: 1px solid rgba(214, 222, 233, .94); border-radius: 1.2rem; background: rgba(255, 255, 255, .96); box-shadow: 0 18px 44px rgba(35, 55, 88, .18); backdrop-filter: blur(16px); }
  .mobile-bottom-nav a, .mobile-bottom-nav button { display: grid; min-width: 0; min-height: 3.25rem; place-items: center; align-content: center; gap: .12rem; border: 0; border-radius: .9rem; background: transparent; color: var(--text-muted); cursor: pointer; text-decoration: none; }
  .mobile-bottom-nav .ui-icon { width: 1.25rem; height: 1.25rem; }
  .mobile-bottom-nav small { font-size: .58rem; font-weight: 750; white-space: nowrap; }
  .mobile-bottom-nav .is-active, .mobile-bottom-nav [aria-current="page"] { background: var(--surface-accent); color: var(--action-primary-hover); }
  .mobile-more-layer:not([hidden]) { position: fixed; inset: 0; z-index: var(--z-overlay); display: grid; align-items: end; }
  .mobile-more-backdrop { position: absolute; inset: 0; border: 0; background: rgba(18, 27, 43, .46); opacity: 1; }
  .mobile-more-sheet { position: relative; display: grid; max-height: min(78dvh, 42rem); overflow-y: auto; padding: 1.2rem 1rem max(1.1rem, env(safe-area-inset-bottom)); border-radius: 1.5rem 1.5rem 0 0; background: var(--surface-card); box-shadow: 0 -20px 54px rgba(18, 27, 43, .2); }
  .mobile-more-sheet > header { display: flex; align-items: start; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; }
  .mobile-more-sheet h2 { margin: 0; font-size: 1.4rem; }
  .sheet-close { display: grid; width: 2.75rem; height: 2.75rem; place-items: center; border: 1px solid var(--border-subtle); border-radius: .85rem; background: var(--surface-subtle); cursor: pointer; font-size: 1.3rem; }
  .mobile-more-sheet nav { display: grid; gap: .4rem; }
  .mobile-more-sheet nav a { display: grid; grid-template-columns: 2.6rem minmax(0, 1fr); align-items: center; gap: .75rem; min-height: 3.8rem; padding: .55rem .65rem; border-radius: var(--primitive-radius-md); color: var(--text-body); text-decoration: none; }
  .mobile-more-sheet nav a:hover, .mobile-more-sheet nav a[aria-current="page"] { background: var(--surface-accent); color: var(--action-primary-hover); }
  .mobile-more-sheet nav a > span:first-child { display: grid; width: 2.5rem; height: 2.5rem; place-items: center; border-radius: .75rem; background: var(--primitive-slate-100); }
  .mobile-more-sheet nav a > span:first-child .ui-icon { width: 1.35rem; height: 1.35rem; }
  .mobile-more-sheet nav a > span:last-child { display: grid; gap: .12rem; }
  .mobile-more-sheet nav strong { font-size: .82rem; }
  .mobile-more-sheet nav small { color: var(--text-muted); font-size: .68rem; }
  .sheet-logout { margin-top: 1rem; padding-top: 1rem; border-top: 1px solid var(--border-subtle); }
  .sheet-logout .ghost-btn { width: 100%; }
  .teacher-workspace { gap: 1rem; }
  .page-header, .teacher-header { display: grid; align-items: start; gap: 1rem; padding-top: 0; }
  .page-header h1, .teacher-header h1 { font-size: 1.75rem; }
  .teacher-actions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); justify-content: stretch; width: 100%; }
  .teacher-actions > *, .teacher-actions form > * { width: 100%; }
  .kpi-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .55rem; }
  .kpi-card { padding: 1rem; }
  .dashboard-bento { grid-template-columns: 1fr; gap: .65rem; }
  .bento-performance, .bento-integrity, .bento-resources, .bento-export { grid-column: auto; }
  .resource-grid { grid-template-columns: repeat(2, 1fr); }
  .distribution-list > div { grid-template-columns: minmax(5.5rem, .8fr) minmax(5rem, 1.4fr) 1.5rem; gap: .5rem; }
  .section-title-row { align-items: start; }
  .result-filter-grid { grid-template-columns: 1fr; }
  .result-filter-grid .filter-search-wide, .result-filter-grid .filter-actions { grid-column: auto; }
  .filter-actions { display: grid; grid-template-columns: 1fr 1fr; }
  .filter-actions > * { width: 100%; }
  input[type="text"], input[type="search"], input[type="number"], input[type="password"], input[type="email"], input[type="date"], select, textarea { font-size: 16px; }
  .student-home-shell { width: min(100% - 1rem, 48rem); padding: .75rem 0 2rem; }
  .student-home-topbar { display: grid; gap: 1rem; }
  .student-account-actions { display: grid; grid-template-columns: 1fr 1fr; }
  .student-account-actions > *, .student-account-actions button { width: 100%; }
  .student-dashboard-grid { grid-template-columns: 1fr; grid-template-rows: auto; }
  .student-welcome-card { grid-row: auto; min-height: 20rem; align-items: end; padding: 1.4rem; }
  .student-welcome-card h2 { font-size: clamp(2.4rem, 13vw, 3.6rem); }
  .student-progress-ring { width: 6rem; height: 6rem; }
  .student-progress-ring::before { width: 4.7rem; height: 4.7rem; }
  .student-next-card { order: 2; }
  .student-profile-card { order: 3; }
  .student-kpis { margin-bottom: 1.2rem; }
  .student-exam-grid { grid-template-columns: 1fr; }
  .integrity-review-panel { padding: 1rem; border-radius: var(--primitive-radius-lg); }
  .integrity-review-heading { display: grid; gap: .85rem; }
  .integrity-evidence-note { max-width: none !important; }
  .integrity-event-title { display: grid; gap: .25rem; }
  .integrity-event-title time { order: -1; }
  .roster-table tbody { grid-template-columns: 1fr; }
  .roster-table tbody tr { grid-template-columns: 1fr; }
  .roster-table tbody th, .roster-table .roster-notes, .roster-table .roster-actions-cell { grid-column: auto; }
  .roster-table tbody th { grid-column: 1 / -1; }
  .roster-table .roster-actions-cell { grid-column: 1 / -1; }
  .roster-row-actions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); width: 100%; }
  .roster-row-actions > *, .roster-row-actions button { width: 100%; }
  .roster-row-actions form:last-child { grid-column: 1 / -1; }
}

@media (max-width: 430px) {
  .teacher-actions, .student-account-actions, .filter-actions { grid-template-columns: 1fr; }
  .kpi-grid { grid-template-columns: 1fr 1fr; }
  .kpi-card > strong { font-size: 1.55rem; }
  .student-welcome-card { display: grid; }
  .student-progress-ring { justify-self: end; }
  .card-heading, .section-title-row { display: grid; }
  .roster-table th, .roster-table td { grid-template-columns: 1fr; gap: .35rem; }
  .roster-row-actions { grid-template-columns: 1fr; }
  .roster-row-actions form:last-child { grid-column: auto; }
  .integrity-review-stats { grid-template-columns: 1fr 1fr; }
  .integrity-event-card { grid-template-columns: 2rem minmax(0, 1fr); gap: .65rem; padding: .8rem; }
  .integrity-event-icon { width: 2rem; height: 2rem; border-width: 3px; border-radius: .65rem; }
  .integrity-timeline::before { left: 1rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}