:root {
  color-scheme: dark;
  --ink: #f3f7f6;
  --muted: #9eaaa8;
  --line: #2b3a3a;
  --surface: #121b1c;
  --surface-2: #172425;
  --surface-3: #203031;
  --surface-soft: #0e1718;
  --page: #081011;
  --green: #2f6f95;
  --green-dark: #8fc7e4;
  --gold: #d7a84a;
  --coral: #b85f55;
  --blue: #1f5f89;
  --blue-light: #72acd1;
  --cream: #f2e5d1;
  --shadow: 0 14px 30px rgba(0, 0, 0, 0.24);
  --shadow-soft: 0 8px 18px rgba(0, 0, 0, 0.18);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.06), transparent 34%),
    linear-gradient(180deg, #3a4143 0%, #1d2325 38%, #0d1213 100%);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

button,
input,
select,
textarea {
  transition:
    border-color 160ms ease,
    background-color 160ms ease,
    box-shadow 160ms ease,
    color 160ms ease;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.52;
}

[hidden] {
  display: none !important;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid rgba(122, 219, 185, 0.28);
  outline-offset: 2px;
}

.app-shell {
  min-height: 100vh;
}

.app-header {
  border-bottom: 1px solid #c79a3e;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.24), transparent 44%),
    linear-gradient(90deg, #7d5a1e, #d4a84a 46%, #8a631f);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.32),
    0 10px 24px rgba(0, 0, 0, 0.24);
}

.brand {
  width: min(1240px, calc(100% - 32px));
  min-height: 82px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand img {
  width: 58px;
  height: 58px;
  object-fit: contain;
}

.brand strong,
.brand span {
  display: block;
}

.brand strong {
  font-size: clamp(1.45rem, 3vw, 2rem);
  line-height: 1;
}

.brand span {
  margin-top: 5px;
  color: #2f2412;
  font-size: 0.92rem;
}

.eyebrow {
  margin: 0 0 8px;
  color: inherit;
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.workspace {
  width: min(1240px, calc(100% - 32px));
  margin: 22px auto 56px;
  position: relative;
  z-index: 1;
}

.entry-grid,
.login-shell {
  display: grid;
  justify-items: center;
}

.entry-panel,
.login-panel {
  width: min(100%, 720px);
}

.entry-panel h2 {
  margin: 0 0 8px;
  font-size: clamp(1.65rem, 3vw, 2.35rem);
}

.role-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.role-card {
  min-height: 150px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  background: var(--surface-2);
  color: var(--ink);
  text-align: left;
}

.role-card:hover {
  border-color: rgba(114, 172, 209, 0.52);
  background: #17252b;
  box-shadow: inset 3px 0 0 var(--blue-light);
}

.role-card strong {
  display: block;
  margin-bottom: 8px;
  color: var(--blue-light);
  font-size: 1.18rem;
}

.role-card span {
  color: var(--muted);
  line-height: 1.45;
}

.back-button {
  margin-bottom: 14px;
}

.role-tabs {
  display: flex;
  width: fit-content;
  gap: 3px;
  padding: 4px;
  margin-bottom: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(18, 27, 28, 0.94);
  box-shadow: var(--shadow-soft);
}

.tab-button {
  min-width: 112px;
  min-height: 38px;
  border: 0;
  border-radius: 6px;
  color: var(--muted);
  background: transparent;
  font-weight: 800;
}

.session-label {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  border-radius: 6px;
  padding: 0 14px;
  color: var(--green-dark);
  font-weight: 850;
}

.tab-button.is-active {
  color: #fff;
  background: linear-gradient(180deg, #2b78a6, var(--blue));
}

.tab-button:not(.is-active):hover,
.teacher-page-tab:not(.is-active):hover {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.04);
}

.view {
  display: none;
}

.view.is-active {
  display: block;
}

.teacher-page-tabs {
  display: flex;
  overflow-x: auto;
  gap: 3px;
  padding: 4px;
  margin-bottom: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(18, 27, 28, 0.94);
  box-shadow: var(--shadow-soft);
}

.teacher-page-tab {
  flex: 0 0 150px;
  min-height: 38px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  font-weight: 850;
}

.teacher-page-tab.is-active {
  background: linear-gradient(180deg, #2b78a6, var(--blue));
  color: #fff;
}
.tab-notification { display: inline-grid; place-items: center; min-width: 20px; height: 20px; margin-left: 5px; padding: 0 6px; border-radius: 999px; background: var(--coral); color: #fff; font-size: .72rem; }
.tab-notification[hidden] { display: none; }

.app-loading-indicator { position: fixed; z-index: 10000; top: 12px; left: 50%; display: inline-flex; align-items: center; gap: 9px; transform: translateX(-50%); padding: 9px 13px; border: 1px solid rgba(114, 172, 209, .48); border-radius: 999px; background: rgba(8, 16, 17, .94); color: var(--ink); box-shadow: var(--shadow-soft); font-size: .82rem; }
.app-loading-indicator[hidden] { display: none; }
.app-loading-indicator span { width: 14px; height: 14px; border: 2px solid rgba(114, 172, 209, .3); border-top-color: var(--blue-light); border-radius: 50%; animation: app-spin .7s linear infinite; }
.app-is-loading button { pointer-events: none; opacity: .72; }
.toast-region { position: fixed; z-index: 10001; right: 18px; bottom: 18px; max-width: min(360px, calc(100% - 36px)); padding: 11px 14px; border: 1px solid rgba(122, 219, 185, .42); border-radius: 8px; background: rgba(15, 32, 30, .97); color: var(--ink); box-shadow: var(--shadow-soft); opacity: 0; transform: translateY(10px); pointer-events: none; transition: opacity .18s ease, transform .18s ease; }
.toast-region.is-visible { opacity: 1; transform: translateY(0); }
@keyframes app-spin { to { transform: rotate(360deg); } }

:where(button, a, input, select, textarea, summary):focus-visible { outline: 3px solid rgba(114, 172, 209, .72); outline-offset: 3px; }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; } }

.tutorial-tab { display: inline-flex; align-items: center; justify-content: center; margin-left: auto; text-decoration: none; }
.tutorial-top-actions { margin-bottom: 2px; }
.tutorial-welcome { margin: 14px 0; border: 1px solid rgba(114, 172, 209, 0.42); border-radius: 8px; padding: 14px 16px; background: rgba(31, 95, 137, 0.18); display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.tutorial-welcome > div:first-child { display: grid; gap: 4px; }
.tutorial-welcome span { color: var(--muted); }
.tutorial-welcome a { text-decoration: none; }
.tutorial-welcome a.primary-button { display: inline-flex; align-items: center; justify-content: center; }
.tutorial-help { display: inline-grid; place-items: center; width: 24px; height: 24px; margin-left: 4px; border: 1px solid var(--blue-light); border-radius: 50%; color: var(--blue-light); font-size: .8rem; text-decoration: none; vertical-align: middle; }
.tutorial-index { display: flex; flex-wrap: wrap; gap: 8px; }
.tutorial-index a { border: 1px solid var(--line); border-radius: 7px; padding: 8px 11px; background: var(--surface-2); color: var(--ink); text-decoration: none; font-weight: 700; }
.tutorial-section { scroll-margin-top: 18px; }
.tutorial-section details { border-top: 1px solid var(--line); padding: 10px 0; }
.tutorial-section details:first-of-type { border-top: 0; }
.tutorial-section summary { cursor: pointer; color: var(--blue-light); font-weight: 800; }

.teacher-page {
  display: none;
}

.teacher-page.is-active {
  display: block;
}

.teacher-grid,
.dashboard-grid,
.student-layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.teacher-workbench {
  display: grid;
  grid-template-columns: 250px minmax(240px, 0.9fr) minmax(420px, 1.55fr);
  gap: 18px;
  align-items: start;
}

.teacher-sidebar,
.teacher-column,
.teacher-detail,
.detail-stack {
  display: grid;
  gap: 18px;
}

.teacher-sidebar {
  position: sticky;
  top: 16px;
  min-width: 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
  box-shadow: var(--shadow-soft);
}

.sidebar-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.sidebar-heading h2 {
  margin: 0;
  font-size: 1.15rem;
}

.icon-button {
  width: 36px;
  height: 36px;
  border: 0;
  border-radius: 7px;
  background: linear-gradient(180deg, #2b78a6, var(--blue));
  color: #fff;
  font-size: 1.35rem;
  font-weight: 900;
  line-height: 1;
}

.class-list,
.topic-picker,
.student-roster {
  display: grid;
  gap: 8px;
}

.class-nav-item,
.topic-nav-item {
  position: relative;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
  color: var(--ink);
  padding: 12px 13px;
  text-align: left;
}

.class-nav-item.has-trophy-notification { padding-right: 36px; }
.class-nav-item .class-trophy-notification { display: block; color: transparent; }

.class-nav-item:hover,
.topic-nav-item:hover,
.roster-item:hover {
  border-color: rgba(122, 219, 185, 0.38);
  background: #1a292a;
}

.class-nav-item strong,
.topic-nav-item strong {
  display: block;
  margin-bottom: 4px;
  font-size: 0.95rem;
}

.class-nav-item span,
.topic-nav-item span {
  display: block;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.35;
}

.class-nav-item.is-active,
.topic-nav-item.is-active {
  border-color: rgba(114, 172, 209, 0.58);
  background: rgba(31, 95, 137, 0.2);
  color: var(--blue-light);
  box-shadow: inset 3px 0 0 var(--blue-light);
}

.topic-list-panel {
  min-height: 220px;
}

.roster-toolbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: end;
  margin-bottom: 12px;
}

.roster-search {
  margin-bottom: 0;
}

.roster-search input {
  min-height: 38px;
}

.roster-summary {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 850;
  white-space: nowrap;
}

.student-roster {
  max-height: 430px;
  overflow: auto;
  padding-right: 4px;
}

.roster-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  align-items: start;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 10px;
  background: var(--surface-2);
}

.roster-item.is-active {
  border-color: rgba(114, 172, 209, 0.58);
  background: rgba(31, 95, 137, 0.2);
}

.roster-item h3 {
  margin: 0 0 4px;
  font-size: 0.98rem;
}

.roster-name-line {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.roster-name-line h3 {
  margin-bottom: 0;
}

.roster-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 5px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
}

.roster-badge {
  border-radius: 999px;
  padding: 1px 7px;
  background: rgba(228, 180, 79, 0.18);
  color: #f3cf7a;
}

.mini-progress-track {
  height: 5px;
  overflow: hidden;
  border-radius: 999px;
  background: #263435;
  margin-top: 7px;
}

.mini-progress-fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--blue-light), var(--gold));
}

.student-monitor,
.student-topic-monitor {
  display: grid;
  gap: 12px;
}

.student-monitor-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.student-monitor-head h3,
.topic-monitor-row h3 {
  margin: 0 0 4px;
  font-size: 1rem;
}

.topic-monitor-row {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: var(--surface-2);
}

.teacher-page-grid {
  display: grid;
  gap: 16px;
  align-items: start;
}

.teacher-page-grid--classes {
  grid-template-columns: minmax(290px, 350px) minmax(0, 1fr);
}

.class-management-sidebar { display: grid; gap: 12px; position: sticky; top: 12px; }
.class-library-card, .class-selected-card { display: grid; gap: 12px; }
.class-selected-card > button { width: 100%; }
.class-delete-button { margin-top: 2px; }
.class-advanced-settings { border: 1px solid var(--line); border-radius: 8px; background: var(--surface-2); }
.class-advanced-settings > summary { padding: 10px 12px; cursor: pointer; color: var(--blue-light); font-weight: 800; }
.class-advanced-settings label { padding: 2px 12px 12px; }
.class-create-tool { padding: 0; overflow: hidden; }
.class-create-tool > summary { padding: 12px 14px; cursor: pointer; color: var(--blue-light); font-weight: 850; list-style: none; }
.class-create-tool > summary::-webkit-details-marker { display: none; }
.class-create-tool > summary::after { content: "+"; float: right; }
.class-create-tool[open] > summary::after { content: "−"; }
.class-create-tool form { display: grid; gap: 12px; padding: 2px 14px 14px; }
.class-create-tool .helper { margin: 0; }
.class-monitor-tool { padding: 0; overflow: hidden; }
.class-monitor-tool > summary { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 15px 16px; cursor: pointer; list-style: none; }
.class-monitor-tool > summary::-webkit-details-marker { display: none; }
.class-monitor-tool > summary > span:first-child { display: grid; gap: 3px; }
.class-monitor-tool > summary strong { font-size: 1.15rem; }
.class-monitor-chevron { color: var(--blue-light); font-size: 1.2rem; transition: transform .18s ease; }
.class-monitor-tool[open] .class-monitor-chevron { transform: rotate(180deg); }
.class-monitor-tool .student-monitor { padding: 14px 16px 16px; border-top: 1px solid var(--line); }

.teacher-page-grid--topics {
  grid-template-columns: minmax(300px, 360px) minmax(0, 1fr);
}

.topics-class-card { display: grid; gap: 14px; position: sticky; top: 12px; }
.topics-class-card .primary-button { width: 100%; }
.tutorial-help-link { color: var(--blue-light); font-size: .85rem; font-weight: 750; text-align: center; }

.teacher-page-grid--questions {
  grid-template-columns: minmax(260px, 320px) minmax(0, 1fr);
}

.summary-panel { max-width: 1000px; margin: 0 auto; }
.summary-class-picker { width: min(100%, 420px); margin: 16px 0; }
.teacher-summary { display: grid; gap: 12px; }
.summary-overview { display: flex; align-items: baseline; gap: 8px; color: var(--muted); }
.summary-overview strong { color: var(--blue-light); font-size: 1.8rem; }
.summary-topic { border: 1px solid var(--line); border-radius: 8px; background: var(--surface-2); overflow: hidden; }
.summary-topic > summary { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 15px; cursor: pointer; }
.summary-topic > summary > div:first-child { display: grid; gap: 4px; }
.summary-topic > summary span { color: var(--muted); font-size: .82rem; }
.summary-trophy { display: grid; justify-items: end; flex: 0 0 auto; }
.summary-trophy strong { color: var(--gold); font-size: 1.05rem; }
.summary-question-list { display: grid; border-top: 1px solid var(--line); }
.summary-question { display: grid; grid-template-columns: minmax(0, 1fr) 180px; align-items: center; gap: 18px; padding: 13px 15px; border-bottom: 1px solid var(--line); }
.summary-question:last-child { border-bottom: 0; }
.summary-question-text { min-width: 0; }
.summary-question-text > span { color: var(--blue-light); font-size: .76rem; font-weight: 800; text-transform: uppercase; }
.summary-question-text p { margin: 5px 0 0; display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 3; overflow: hidden; line-height: 1.4; }
.summary-progress { display: grid; grid-template-columns: 1fr auto; align-items: baseline; gap: 3px 8px; }
.summary-progress > span { color: var(--muted); font-size: .78rem; }
.summary-progress-track { grid-column: 1 / -1; height: 7px; border-radius: 99px; background: var(--surface-soft); overflow: hidden; }
.summary-progress-track i { display: block; height: 100%; border-radius: inherit; background: var(--blue-light); }

.dashboard-grid {
  margin-top: 18px;
  grid-template-columns: 1.35fr 0.65fr;
}

.student-layout {
  align-items: start;
  grid-template-columns: 360px minmax(0, 1fr);
}

.student-layout--login {
  grid-template-columns: minmax(0, 720px);
  justify-content: center;
}

.student-layout--login #login-form {
  width: min(100%, 720px);
}

.panel {
  min-width: 0;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
  box-shadow: var(--shadow-soft);
}

.panel--wide {
  grid-column: 1 / -1;
}

.panel-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
  padding-bottom: 13px;
  border-bottom: 1px solid rgba(43, 58, 58, 0.82);
}

.panel h2 {
  margin: 0;
  font-size: 1.25rem;
  letter-spacing: 0;
}

label {
  display: grid;
  gap: 7px;
  margin-bottom: 14px;
  color: #c7d1cf;
  font-size: 0.92rem;
  font-weight: 750;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid #344647;
  border-radius: 7px;
  background: #0b1314;
  color: var(--ink);
  padding: 10px 12px;
  outline: 0;
}

textarea {
  resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--blue-light);
  box-shadow: 0 0 0 3px rgba(114, 172, 209, 0.16);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 14px;
}

.primary-button,
.secondary-button,
.danger-button {
  min-height: 40px;
  border: 0;
  border-radius: 7px;
  padding: 0 16px;
  color: #fff;
  font-weight: 850;
}

.primary-button {
  background: linear-gradient(180deg, #2c7eae, var(--blue));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.16);
}

.primary-button:hover {
  background: linear-gradient(180deg, #368dbf, #256c9a);
}

.secondary-button {
  background: linear-gradient(180deg, #e0b85d, #b9832f);
  color: #18110a;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.22);
}

.secondary-button:hover {
  background: linear-gradient(180deg, #edc770, #c7933f);
}

.danger-button {
  background: linear-gradient(180deg, #c76f63, var(--coral));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.12);
}

.danger-button:hover {
  background: linear-gradient(180deg, #d37b70, #c2675d);
}

.google-button {
  display: inline-flex;
  width: 100%;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border: 1px solid rgba(114, 172, 209, 0.38);
  border-radius: 8px;
  padding: 0 16px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.14), transparent 46%),
    linear-gradient(90deg, #2a3032, #444d50 48%, #23292b);
  color: var(--cream);
  font-weight: 900;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.2),
    var(--shadow-soft);
}

.google-button:hover {
  border-color: rgba(114, 172, 209, 0.72);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.18), transparent 46%),
    linear-gradient(90deg, #30383a, #505a5d 48%, #2a3133);
}

.google-mark {
  display: grid;
  width: 28px;
  height: 28px;
  place-items: center;
  border-radius: 999px;
  background: linear-gradient(135deg, #4285f4, #34a853 45%, #fbbc05 70%, #ea4335);
  color: #fff;
  font-weight: 950;
}

.demo-login {
  margin: 14px 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: rgba(8, 16, 17, 0.38);
}

.demo-login summary {
  cursor: pointer;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 850;
}

.demo-login label:first-of-type {
  margin-top: 14px;
}

.class-code-pill {
  display: inline-flex;
  width: fit-content;
  max-width: 100%;
  white-space: normal;
  border-radius: 999px;
  background: rgba(31, 95, 137, 0.24);
  color: var(--blue-light);
  margin-top: 8px;
  padding: 8px 10px;
  font-size: 0.82rem;
  font-weight: 850;
  overflow-wrap: anywhere;
  text-align: left;
}

.progress-list,
.compact-list,
.exercise-stack {
  display: grid;
  gap: 12px;
}

.student-row,
.exercise-item,
.student-exercise,
.topic-card,
.question-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 13px;
  background: var(--surface-2);
}

.student-row__top,
.exercise-item__top,
.student-dashboard-head,
.student-class-summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
}

.student-row h3,
.exercise-item h3,
.student-exercise h3,
.topic-card h3 {
  margin: 0;
  font-size: 1rem;
}

.meta,
.helper {
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.4;
}

.helper {
  min-height: 20px;
  margin: 12px 0 0;
}

.progress-track {
  height: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: #263435;
  margin: 12px 0 8px;
}

.progress-fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--blue-light), var(--gold));
  transition: width 220ms ease;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  border-radius: 999px;
  padding: 4px 9px;
  background: rgba(228, 180, 79, 0.18);
  color: #f3cf7a;
  font-size: 0.8rem;
  font-weight: 850;
}

.badge--muted {
  background: #263435;
  color: var(--muted);
}

.badge--done {
  background: rgba(31, 95, 137, 0.22);
  color: var(--blue-light);
}

.due-timer {
  display: inline-flex;
  width: fit-content;
  min-height: 30px;
  align-items: center;
  border: 1px solid rgba(90, 168, 214, 0.4);
  border-radius: 999px;
  margin: 8px 0 0;
  padding: 4px 10px;
  background: rgba(90, 168, 214, 0.11);
  color: #b9e4fb;
  font-size: 0.84rem;
  font-weight: 850;
}

.due-timer.is-soon {
  border-color: rgba(228, 180, 79, 0.55);
  background: rgba(228, 180, 79, 0.15);
  color: #f3cf7a;
}

.due-timer.is-overdue {
  border-color: rgba(223, 107, 91, 0.6);
  background: rgba(223, 107, 91, 0.14);
  color: #ffb4a8;
}

.row-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.row-actions--form {
  margin-top: 0;
}

.row-actions--compact {
  margin-top: 0;
  justify-content: flex-end;
}

.row-actions--compact .secondary-button,
.row-actions--compact .danger-button {
  min-height: 34px;
  padding: 0 10px;
  font-size: 0.8rem;
}

.attachment-link {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  max-width: 100%;
  margin-top: 8px;
  border: 1px solid rgba(90, 168, 214, 0.5);
  border-radius: 7px;
  padding: 6px 10px;
  color: #a8d8f2;
  background: rgba(90, 168, 214, 0.12);
  font-size: 0.88rem;
  font-weight: 800;
  overflow-wrap: anywhere;
  text-decoration: none;
}

.attachment-link:hover {
  border-color: var(--blue);
}

.topic-trophy-list,
.question-list {
  display: grid;
  gap: 9px;
  margin-top: 12px;
}

.topic-trophy-list {
  display: flex;
  flex-wrap: wrap;
}

.topic-validation {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 7px;
}

.level-select {
  width: auto;
  min-height: 30px;
  padding: 4px 8px;
  font-size: 0.78rem;
  font-weight: 850;
}

.topic-validation .secondary-button {
  min-height: 30px;
  padding: 0 10px;
  font-size: 0.78rem;
}

.trophy-board {
  margin: 18px 0;
  border: 1px solid rgba(228, 180, 79, 0.38);
  border-radius: 8px;
  padding: 18px;
  background:
    linear-gradient(135deg, rgba(228, 180, 79, 0.12), transparent 36%),
    var(--surface-2);
}

.trophy-board h3,
.pennant-card h3 {
  margin: 0;
  font-size: 1rem;
}

.pennant-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 12px;
  margin-top: 14px;
}

.pennant-card {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  width: 100%;
  border: 1px solid rgba(228, 180, 79, 0.28);
  border-radius: 8px;
  padding: 12px;
  background: rgba(8, 16, 17, 0.62);
  color: var(--ink);
  text-align: left;
}

.pennant-card:hover {
  border-color: rgba(228, 180, 79, 0.72);
  background: rgba(228, 180, 79, 0.09);
}

.pennant {
  position: relative;
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(228, 180, 79, 0.42);
  border-radius: 999px;
  background: rgba(228, 180, 79, 0.12);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.16),
    0 10px 22px rgba(0, 0, 0, 0.24);
}

.pennant.level-base {
  border-color: rgba(114, 172, 209, 0.56);
  background: radial-gradient(circle at 45% 35%, rgba(114, 172, 209, 0.28), rgba(31, 95, 137, 0.16));
}

.pennant.level-intermedio {
  border-color: rgba(228, 180, 79, 0.62);
  background: radial-gradient(circle at 45% 35%, rgba(228, 180, 79, 0.34), rgba(185, 131, 47, 0.18));
}

.pennant.level-avanzato {
  border-color: rgba(242, 229, 209, 0.74);
  background: radial-gradient(circle at 45% 35%, rgba(242, 229, 209, 0.38), rgba(114, 172, 209, 0.18));
}

.badge.level-base {
  background: rgba(31, 95, 137, 0.22);
  color: var(--blue-light);
}

.badge.level-intermedio {
  background: rgba(228, 180, 79, 0.18);
  color: #f3cf7a;
}

.badge.level-avanzato {
  background: rgba(242, 229, 209, 0.18);
  color: var(--cream);
}

.pennant img {
  position: absolute;
  inset: 3px;
  width: calc(100% - 6px);
  height: calc(100% - 6px);
  object-fit: contain;
}

.pennant span {
  position: absolute;
  right: -4px;
  bottom: -4px;
  display: grid;
  min-width: 24px;
  height: 24px;
  place-items: center;
  border: 2px solid #0f191a;
  border-radius: 999px;
  background: var(--gold);
  color: #1b1205;
  font-size: 0.82rem;
  font-weight: 950;
}

.empty-trophy-board {
  border: 1px dashed rgba(228, 180, 79, 0.32);
  border-radius: 8px;
  padding: 16px;
  color: var(--muted);
  text-align: center;
}

.trophy-detail {
  margin-top: 14px;
}

.trophy-detail-card {
  border: 1px solid rgba(228, 180, 79, 0.28);
  border-radius: 8px;
  padding: 14px;
  background: rgba(8, 16, 17, 0.72);
}

.question-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) max-content;
  align-items: start;
  gap: 12px;
  background: #0f191a;
}

.question-item p {
  margin: 0;
  line-height: 1.45;
}

.question-item--teacher {
  padding: 12px;
}

.topic-due-badge { display: inline-flex; width: fit-content; margin-top: 7px; padding: 5px 9px; border: 1px solid rgba(228, 180, 79, .32); border-radius: 999px; background: rgba(228, 180, 79, .12); color: var(--gold); font-size: .8rem; font-weight: 800; }
.topic-due-badge.is-empty { border-color: var(--line); background: var(--surface-2); color: var(--muted); }
.teacher-question-card { border: 1px solid var(--line); border-radius: 8px; background: #0f191a; overflow: hidden; }
.teacher-question-card > summary { display: grid; grid-template-columns: max-content minmax(0, 1fr) max-content; align-items: center; gap: 12px; padding: 13px; cursor: pointer; list-style: none; }
.teacher-question-card > summary::-webkit-details-marker { display: none; }
.teacher-question-number { color: var(--blue-light); font-size: .78rem; font-weight: 850; }
.teacher-question-preview { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.teacher-question-chevron { color: var(--blue-light); font-size: 1.2rem; transition: transform .18s ease; }
.teacher-question-card[open] .teacher-question-chevron { transform: rotate(180deg); }
.teacher-question-body { display: grid; grid-template-columns: minmax(0, 1fr) max-content; align-items: start; gap: 12px; padding: 13px; border-top: 1px solid var(--line); }
.teacher-question-body p { margin: 0; line-height: 1.5; white-space: pre-wrap; }
.question-create-tool { padding: 0; overflow: hidden; }
.question-create-tool > summary { padding: 13px 15px; cursor: pointer; color: var(--blue-light); font-weight: 850; list-style: none; }
.question-create-tool > summary::-webkit-details-marker { display: none; }
.question-create-tool > summary::after { content: "+"; float: right; }
.question-create-tool[open] > summary::after { content: "−"; }
.question-create-tool form { display: grid; gap: 12px; padding: 2px 15px 15px; }

.student-panel {
  min-height: 320px;
}

.student-class-tools {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  align-items: stretch;
  margin: 18px 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: var(--surface-2);
}

.student-class-picker {
  display: grid;
  gap: 10px;
}

.student-class-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 10px;
}

.student-class-card,
.empty-class-card {
  position: relative;
  min-height: 118px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: #0f191a;
  color: var(--ink);
  text-align: left;
}

.student-class-card {
  display: grid;
  align-content: end;
  gap: 4px;
}

.student-class-card:hover {
  border-color: rgba(122, 219, 185, 0.42);
  background: #172829;
}

.student-class-card.is-active {
  border-color: rgba(114, 172, 209, 0.72);
  background: rgba(31, 95, 137, 0.22);
  box-shadow: inset 0 3px 0 var(--blue-light);
}

.student-class-card strong {
  font-size: 1rem;
}

.student-class-card span,
.student-class-card small,
.empty-class-card {
  color: var(--muted);
  line-height: 1.35;
}

.student-class-card small {
  font-size: 0.78rem;
}

.notification-dot {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 12px;
  height: 12px;
  border: 2px solid #0f191a;
  border-radius: 999px;
  background: var(--coral);
  box-shadow: 0 0 0 3px rgba(223, 107, 91, 0.18);
}

.notification-dot--inline {
  position: static;
  flex: 0 0 auto;
  border-color: var(--surface-2);
}

.join-class-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: end;
  max-width: 520px;
}

.student-class-tools label,
.join-class-form label {
  margin-bottom: 0;
}

.student-class-tools .helper {
  grid-column: 1 / -1;
  margin: 0;
}

.student-class-content {
  display: grid;
  gap: 14px;
}

.topic-settings-form {
  display: grid;
  grid-template-columns: minmax(180px, 280px) max-content;
  gap: 10px;
  align-items: end;
  margin: 16px 0 4px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
}

.topic-settings-form label {
  margin: 0;
}

.exercise-library-panel {
  min-width: 0;
}

.exercise-library-layout {
  display: grid;
  grid-template-columns: minmax(260px, 360px) minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

.path-library-layout { display: grid; grid-template-columns: minmax(280px, 360px) minmax(0, 1fr); gap: 16px; align-items: start; }
.path-sidebar { display: grid; gap: 12px; position: sticky; top: 12px; }
.path-library-card, .path-selected-card { display: grid; gap: 12px; }
.path-selected-card[hidden] { display: none; }
.path-selected-actions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.path-selected-actions .danger-button { grid-column: 1 / -1; }
.path-create-card, .path-workflow-tool { padding: 0; overflow: hidden; }
.path-create-card > summary, .path-workflow-tool > summary { padding: 12px 14px; cursor: pointer; color: var(--blue-light); font-weight: 850; list-style: none; }
.path-create-card > summary::-webkit-details-marker, .path-workflow-tool > summary::-webkit-details-marker { display: none; }
.path-create-card > summary::after, .path-workflow-tool > summary::after { content: "+"; float: right; font-size: 1.05rem; }
.path-create-card[open] > summary::after, .path-workflow-tool[open] > summary::after { content: "−"; }
.path-create-card .path-form, .path-workflow-tool > form { padding: 2px 14px 14px; }
.path-form, .path-list, .path-detail, .path-topics, .path-topic-body, .path-exercises, .path-exercise-form { display: grid; gap: 12px; }
.path-assignment-form { display: grid; grid-template-columns: repeat(3, minmax(180px, 1fr)) max-content; gap: 12px; align-items: end; }
.path-assignment-form .panel-heading, .path-assignment-form .helper { grid-column: 1 / -1; }
.path-assignment-form label { margin: 0; }
.path-list { min-width: 0; }
.path-nav-item { display: grid; gap: 4px; width: 100%; border: 1px solid var(--line); border-radius: 8px; padding: 12px; background: var(--surface-2); color: var(--ink); text-align: left; }
.path-nav-item span { color: var(--muted); font-size: .84rem; }
.path-nav-item.is-active { border-color: var(--blue-light); background: rgba(31, 95, 137, .24); box-shadow: inset 3px 0 0 var(--blue-light); }
.path-topic { padding: 0; overflow: hidden; }
.path-topic > summary { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 16px; cursor: pointer; list-style: none; }
.path-topic > summary::-webkit-details-marker { display: none; }
.path-topic > summary div { display: grid; gap: 3px; }
.path-topic > summary span { color: var(--muted); }
.path-topic > summary > span:last-child { color: var(--blue-light); font-size: 1.2rem; transition: transform .18s ease; }
.path-topic[open] > summary > span:last-child { transform: rotate(180deg); }
.path-topic-body { padding: 0 16px 16px; border-top: 1px solid var(--line); }
.path-exercises { margin-top: 4px; }
.path-exercise-form { padding: 14px; border: 1px dashed var(--line); border-radius: 8px; background: var(--surface-2); }
.path-exercise textarea { width: 100%; }
.path-assignment-history { display: flex; flex-wrap: wrap; align-items: center; gap: 7px; padding: 10px 12px; border: 1px solid rgba(122, 219, 185, .25); border-radius: 8px; background: rgba(48, 117, 91, .12); }
.path-assignment-history span { padding: 5px 8px; border-radius: 999px; background: rgba(122, 219, 185, .13); color: var(--ink); font-size: .8rem; }
.path-assignment-empty { margin: 0; color: var(--muted); font-size: .85rem; }
.department-layout { display: grid; grid-template-columns: minmax(280px, 360px) minmax(0, 1fr); gap: 16px; align-items: start; }
.department-sidebar, .department-list, .department-detail, .department-members, .department-settings { display: grid; gap: 12px; }
.department-sidebar { position: sticky; top: 12px; }
.department-collaboration-card, .department-role-card, .department-group-card { display: grid; gap: 12px; }
.department-role-card[hidden], .department-group-card[hidden] { display: none; }
.department-sidebar form { display: grid; gap: 12px; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.department-selected-label { display: grid; gap: 3px; padding: 10px 12px; border: 1px solid rgba(114, 172, 209, .32); border-radius: 8px; background: rgba(31, 95, 137, .14); }
.department-selected-label span { color: var(--muted); font-size: .76rem; text-transform: uppercase; letter-spacing: .05em; }
.department-sidebar-tool { border: 1px solid var(--line); border-radius: 8px; background: var(--surface-2); }
.department-sidebar-tool > summary { cursor: pointer; padding: 11px 12px; color: var(--blue-light); font-weight: 850; }
.department-sidebar-tool form { padding: 2px 12px 12px; border: 0; }
.department-sidebar-tool .helper { margin: 0; }
.department-delete-button { width: 100%; }
.department-group-details > summary { cursor: pointer; color: var(--blue-light); font-weight: 850; }
.department-group-details .department-members { margin-top: 12px; }
.department-group-card .department-member { align-items: stretch; flex-direction: column; padding: 11px; }
.department-group-card .department-member .row-actions { flex-wrap: wrap; }
.department-group-card .department-member button { padding: 7px 9px; font-size: .78rem; }
.department-add-member { display: grid; grid-template-columns: minmax(220px, 1fr) max-content; gap: 12px; align-items: end; }
.department-add-member .panel-heading, .department-add-member .helper { grid-column: 1 / -1; }
.department-add-member label { margin: 0; }
.department-member { display: flex; justify-content: space-between; align-items: center; gap: 14px; padding: 14px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface-2); }
.department-member > div:first-child { display: grid; gap: 4px; }
.department-member span { color: var(--muted); font-size: .84rem; }
.department-path-create, .department-proposal-form { display: grid; grid-template-columns: repeat(2, minmax(200px, 1fr)) max-content; gap: 12px; align-items: end; }
.department-path-create .panel-heading, .department-proposal-form .panel-heading, .department-proposal-form .helper { grid-column: 1 / -1; }
.department-path-create label, .department-proposal-form label { margin: 0; }
.department-path-create label:last-of-type { grid-column: 1 / -1; }
.department-shared-paths, .department-shared-topics { display: grid; gap: 14px; }
.department-shared-path { padding: 0; overflow: hidden; }
.department-shared-path-summary { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 15px 16px; cursor: pointer; list-style: none; }
.department-shared-path-summary::-webkit-details-marker { display: none; }
.department-shared-path-summary > div { display: grid; gap: 3px; }
.department-shared-path-summary h3, .department-shared-path-summary p { margin: 0; }
.department-shared-path-summary > div > span { color: var(--muted); font-size: .84rem; }
.department-path-summary-actions { display: inline-flex; align-items: center; gap: 10px; flex: 0 0 auto; }
.department-path-pending-badge { margin-left: 0; }
.department-path-chevron { color: var(--blue-light); font-size: 1.2rem; transition: transform .18s ease; }
.department-shared-path[open] .department-path-chevron { transform: rotate(180deg); }
.department-shared-path-body { display: grid; gap: 14px; padding: 14px 16px 16px; border-top: 1px solid var(--line); }
.department-shared-path-body > .panel-heading { margin: 0; }
.department-shared-topic { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 16px; padding: 14px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface-2); }
.department-shared-topic.status-proposed { border-left: 4px solid #d9a441; }
.department-shared-topic.status-published { border-left: 4px solid var(--green); }
.department-shared-topic.status-rejected { border-left: 4px solid var(--coral); opacity: .82; }
.department-shared-topic h4 { margin: 10px 0 5px; }
.department-shared-topic details { margin-top: 10px; }
.department-shared-topic summary { cursor: pointer; color: var(--blue-light); font-weight: 800; }
.department-exercise-preview { padding: 9px; border-top: 1px solid var(--line); white-space: pre-wrap; }
.department-topic-actions, .department-topic-assign { display: grid; gap: 8px; align-content: start; }
.department-topic-assign { min-width: 210px; }
.department-topic-assign label { margin: 0; }
.review-note { color: var(--muted); font-style: italic; }
.department-review-history > summary { cursor: pointer; color: var(--blue-light); font-weight: 850; }
.department-review-history > div { display: grid; gap: 8px; margin-top: 14px; }
.department-review-history article { display: flex; justify-content: space-between; gap: 14px; padding: 10px 0; border-top: 1px solid var(--line); }
.department-review-history article > div { display: grid; gap: 3px; }
.department-review-history span, .department-review-history small { color: var(--muted); }
.department-create-tool { margin-top: 4px; }

@media (max-width: 900px) { .path-library-layout, .path-assignment-form, .department-layout, .department-add-member, .department-path-create, .department-proposal-form, .department-shared-topic { grid-template-columns: 1fr; } .path-sidebar, .department-sidebar { position: static; } .path-assignment-form .panel-heading, .path-assignment-form .helper, .department-add-member .panel-heading, .department-add-member .helper, .department-path-create .panel-heading, .department-proposal-form .panel-heading, .department-proposal-form .helper, .department-path-create label:last-of-type { grid-column: auto; } .department-member { align-items: flex-start; flex-direction: column; } }

.exercise-library {
  display: grid;
  gap: 16px;
}

.library-filters {
  display: grid;
  grid-template-columns: minmax(160px, 1fr) minmax(180px, 1fr) max-content;
  gap: 10px;
  align-items: end;
  margin-bottom: 16px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
}

.library-filters label {
  margin: 0;
}

.library-selection-notice {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  padding: 16px;
  border: 1px solid rgba(114, 172, 209, 0.65);
  border-radius: 8px;
  background: rgba(31, 95, 137, 0.2);
}

.library-topic-group {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
  overflow: hidden;
}

.library-topic-summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

.library-topic-summary::-webkit-details-marker {
  display: none;
}

.library-topic-summary:hover {
  background: rgba(122, 219, 185, 0.06);
}

.library-topic-summary h3,
.library-topic-summary p {
  margin: 0;
}

.library-topic-summary__meta {
  display: flex;
  align-items: center;
  gap: 10px;
}

.library-topic-chevron {
  color: var(--muted);
  font-size: 1.25rem;
  transition: transform 160ms ease;
}

.library-topic-group[open] .library-topic-chevron {
  transform: rotate(180deg);
}

.library-topic-group > .question-list {
  padding: 0 16px 16px;
  border-top: 1px solid var(--line);
}

.exercise-edit-textarea {
  width: 100%;
  min-height: 150px;
  resize: vertical;
  line-height: 1.5;
}

.admin-shell { min-height: 100vh; }
.login-test-shell { min-height: 100vh; }
#google-signin-button { display: flex; justify-content: center; margin: 22px 0 10px; min-height: 44px; }
.admin-toolbar { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 16px; }
.admin-toolbar h2, .admin-toolbar p { margin: 0; }
.admin-grid { display: grid; grid-template-columns: minmax(260px, 360px) minmax(0, 1fr); gap: 16px; align-items: start; }
.admin-license-panel { min-width: 0; }
.admin-data-panel { margin-top: 16px; }
.admin-audit-panel { margin-top: 16px; }
.admin-data-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-top: 18px; }
.admin-data-grid h4 { margin: 0 0 10px; color: var(--blue-light); }
.admin-data-search { margin-bottom: 10px; font-size: .82rem; }
.admin-data-search input { margin-top: 5px; }
.deletion-list { display: grid; gap: 9px; }
.deletion-card { display: grid; gap: 10px; padding: 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface-2); }
.deletion-card > div { display: grid; gap: 4px; min-width: 0; }
.deletion-card strong, .deletion-card span { overflow-wrap: anywhere; }
.deletion-card span { color: var(--muted); font-size: .82rem; }
.deletion-card .danger-button { width: 100%; }
.admin-pagination { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-top: 12px; color: var(--muted); font-size: .82rem; }
.admin-pagination > div { display: flex; gap: 6px; }
.admin-pagination button { min-height: 34px; padding: 6px 9px; font-size: .78rem; }
.audit-table-wrap { margin-top: 16px; overflow-x: auto; }
.audit-table { width: 100%; border-collapse: collapse; min-width: 760px; }
.audit-table th, .audit-table td { border-bottom: 1px solid var(--line); padding: 10px; text-align: left; vertical-align: top; }
.audit-table th { color: var(--blue-light); font-size: .8rem; }
.audit-table td { font-size: .82rem; overflow-wrap: anywhere; }
.status-link-button { display: inline-flex; align-items: center; justify-content: center; text-decoration: none; }
.status-workspace { max-width: 1100px; }
.status-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.status-card { display: flex; align-items: flex-start; gap: 12px; }
.status-card > div { display: grid; gap: 5px; min-width: 0; }
.status-card strong { overflow-wrap: anywhere; }
.status-indicator { flex: 0 0 auto; width: 11px; height: 11px; margin-top: 4px; border-radius: 50%; box-shadow: 0 0 0 4px rgba(255,255,255,.04); }
.status-indicator.is-ok { background: #63c69e; }
.status-indicator.is-warning { background: var(--gold); }
.status-count-panel, .status-backup-panel { margin-top: 16px; }
.status-count-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.status-count-grid > div { display: grid; gap: 3px; border: 1px solid var(--line); border-radius: 7px; padding: 12px; background: var(--surface-2); }
.status-count-grid strong { color: var(--blue-light); font-size: 1.4rem; }
.status-count-grid span, .status-backup-value span { color: var(--muted); font-size: .82rem; }
.status-backup-value { display: grid; gap: 4px; margin: 14px 0; }
.license-list { display: grid; gap: 10px; }
.license-card { display: grid; grid-template-columns: minmax(0, 1fr) auto auto; align-items: center; gap: 14px; padding: 14px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface-2); }
.license-card > div:first-child { display: grid; gap: 4px; min-width: 0; }
.license-card > div:first-child span { color: var(--muted); font-size: .78rem; overflow-wrap: anywhere; }
.license-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; color: var(--muted); font-size: .85rem; }

.student-main-navigation {
  display: flex;
  gap: 8px;
  margin: 18px 0;
  padding: 5px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
}

.student-main-tab {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 6px;
  padding: 11px 16px;
  background: transparent;
  color: var(--muted);
  font-weight: 700;
}

.student-main-tab:hover {
  color: var(--ink);
  background: rgba(122, 219, 185, 0.08);
}

.student-main-tab.is-active {
  color: var(--ink);
  background: rgba(31, 95, 137, 0.3);
  box-shadow: inset 0 -2px 0 var(--blue-light);
}

.student-tutorial-tab { flex: 0 0 auto; margin-left: auto; text-decoration: none; }

.student-active-class { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; padding: 11px 13px; border: 1px solid rgba(114, 172, 209, .32); border-radius: 8px; background: rgba(31, 95, 137, .14); }
.student-active-class span { color: var(--muted); font-size: .78rem; text-transform: uppercase; letter-spacing: .05em; }
.student-active-class strong { margin-right: auto; }
.student-section-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.student-section-heading h3 { margin: 3px 0 0; }

.student-class-summary {
  margin-top: 4px;
}

.empty-state {
  min-height: 170px;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 8px;
  color: var(--muted);
  text-align: center;
}

.empty-state strong {
  color: var(--ink);
  font-size: 1.05rem;
}

.answer-box {
  margin-top: 12px;
}

.public-shell {
  min-height: 100vh;
}

.public-header .brand {
  color: var(--ink);
  text-decoration: none;
}

.public-content {
  width: min(900px, calc(100% - 32px));
  margin: 28px auto 48px;
  display: grid;
  gap: 18px;
}

.public-content h1,
.public-content h2,
.public-content p {
  margin-top: 0;
}

.public-content h1 {
  margin-bottom: 8px;
  font-size: clamp(2rem, 5vw, 3rem);
}

.public-content h2 {
  color: var(--blue-light);
  font-size: 1.2rem;
}

.public-content p,
.public-content li {
  line-height: 1.65;
}

.public-content a,
.site-footer a {
  color: var(--blue-light);
}

.public-content a:hover,
.site-footer a:hover {
  color: var(--ink);
}

.public-notice {
  border-left: 4px solid var(--gold);
  padding: 14px 16px;
  border-radius: 6px;
  background: rgba(215, 168, 74, 0.12);
}

.public-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.public-actions a {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 9px 14px;
  background: var(--surface-2);
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}

.contact-list {
  display: grid;
  grid-template-columns: minmax(160px, 220px) minmax(0, 1fr);
  margin: 0;
}

.contact-list dt,
.contact-list dd {
  margin: 0;
  border-bottom: 1px solid var(--line);
  padding: 12px 0;
}

.contact-list dt {
  color: var(--muted);
  font-weight: 700;
}

.contact-list dd {
  overflow-wrap: anywhere;
}

.site-footer {
  width: min(1240px, calc(100% - 32px));
  margin: 16px auto 0;
  border-top: 1px solid var(--line);
  padding: 20px 0 28px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  color: var(--muted);
  font-size: .86rem;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

@media (max-width: 820px) {
  .admin-grid, .admin-data-grid, .license-card, .status-grid, .status-count-grid { grid-template-columns: 1fr; }
  .library-filters {
    grid-template-columns: 1fr;
  }

  .exercise-library-layout {
    grid-template-columns: 1fr;
  }

  .topic-settings-form {
    grid-template-columns: 1fr;
  }

  .brand {
    width: min(100% - 24px, 1240px);
    min-height: 72px;
    gap: 12px;
  }

  .brand img {
    width: 50px;
    height: 50px;
  }

  .workspace {
    width: min(100% - 24px, 1240px);
    margin-top: 16px;
  }

  .teacher-grid,
  .dashboard-grid,
  .teacher-workbench,
  .teacher-page-grid,
  .student-layout,
  .student-class-tools,
  .join-class-form,
  .roster-toolbar,
  .form-row,
  .roster-item,
  .question-item {
    grid-template-columns: 1fr;
  }

  .teacher-sidebar {
    position: static;
  }

  .topics-class-card {
    position: static;
  }

  .class-management-sidebar {
    position: static;
  }

  .role-tabs {
    width: 100%;
  }

  .tab-button {
    flex: 1;
    min-width: 0;
  }

  .teacher-page-tabs {
    width: 100%;
    overflow-x: auto;
  }

  .teacher-page-tab {
    flex: 0 0 auto;
    min-width: 112px;
  }

  .role-card-grid {
    grid-template-columns: 1fr;
  }

  .roster-summary {
    white-space: normal;
  }

  .panel {
    padding: 16px;
  }

  .contact-list {
    grid-template-columns: 1fr;
  }

  .contact-list dt {
    padding-bottom: 3px;
    border-bottom: 0;
  }

  .contact-list dd {
    padding-top: 0;
  }

  .site-footer {
    display: grid;
  }

  .tutorial-welcome { display: grid; }

  .summary-topic > summary, .summary-question { grid-template-columns: 1fr; display: grid; }
  .summary-trophy { justify-items: start; }
  .teacher-question-body { grid-template-columns: 1fr; }
  .teacher-question-card > summary { grid-template-columns: 1fr max-content; }
  .teacher-question-number { grid-column: 1 / -1; }
  .student-main-navigation { overflow-x: auto; }
  .student-main-tab { flex: 0 0 auto; min-width: 132px; }
  .student-active-class { align-items: flex-start; flex-wrap: wrap; }
  .student-active-class strong { width: calc(100% - 110px); }


  .student-dashboard-head,
  .student-monitor-head,
  .panel-heading {
    display: grid;
  }
}