:root {
  /* Brand */
  --color-primary: #0f766e;
  --color-primary-hover: #115e59;
  --color-primary-soft: #e6f4f1;
  --color-primary-border: #b6dfd9;

  /* Semantic status */
  --color-success: #15803d;
  --color-success-soft: #dcfce7;
  --color-warning: #b45309;
  --color-warning-soft: #fef3c7;
  --color-error: #dc2626;
  --color-error-soft: #fee2e2;

  /* Neutrals */
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-text: #0f172a;
  --color-muted-text: #64748b;
  --color-neutral-soft: #f1f5f9;
  --color-neutral-text: #475569;
  --color-border: #e2e8f0;
  --color-input-border: #8593a6;

  /* Spacing — 4/8 rhythm */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;

  --radius-card: 12px;
  --radius-control: 8px;

  --shadow-card: 0 1px 2px rgba(15, 23, 42, 0.04), 0 4px 12px rgba(15, 118, 110, 0.06);

  --font-heading: "Lexend", "Source Sans 3", system-ui, sans-serif;
  --font-body: "Source Sans 3", system-ui, -apple-system, "Segoe UI", sans-serif;

  --ease: cubic-bezier(0.2, 0, 0, 1);
  color-scheme: light;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

/* ---------- App shell ---------- */
.skip-link {
  position: absolute;
  left: var(--space-3);
  top: -48px;
  z-index: 100;
  padding: var(--space-2) var(--space-3);
  background: var(--color-primary);
  color: var(--color-surface);
  border-radius: var(--radius-control);
  font-weight: 600;
  text-decoration: none;
}
.skip-link:focus { top: var(--space-2); }

.app-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.app-header-inner {
  max-width: 720px;
  margin: 0 auto;
  min-height: 56px;
  padding: 0 var(--space-3);
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  flex: none;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--color-primary);
  color: var(--color-surface);
  display: grid;
  place-items: center;
}

.brand-name {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

[hidden] { display: none !important; }

.app-nav {
  display: flex;
  align-self: stretch;
  gap: var(--space-1);
  margin-left: var(--space-3);
}

.nav-tab {
  display: inline-flex;
  align-items: center;
  min-height: 56px;
  padding: 0 12px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--color-muted-text);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: color 150ms var(--ease), border-color 150ms var(--ease);
}
.nav-tab:hover { color: var(--color-text); }
.nav-tab[aria-current="page"] { color: var(--color-primary); border-bottom-color: var(--color-primary); }

.header-actions { display: flex; align-items: center; gap: var(--space-3); margin-left: auto; min-width: 0; }

@media (max-width: 560px) {
  .app-header-inner { flex-wrap: wrap; }
  .app-nav {
    order: 3;
    width: 100%;
    margin-left: 0;
    border-top: 1px solid var(--color-border);
  }
  .nav-tab { flex: 1; justify-content: center; min-height: 48px; }
  .user-trigger-name { display: none; }
}

#app {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--space-4) var(--space-3) var(--space-5);
}

@media (min-width: 768px) {
  #app { padding-top: var(--space-5); }
}

/* ---------- Surfaces & type ---------- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: var(--space-4);
  box-shadow: var(--shadow-card);
  margin-bottom: var(--space-3);
}

@media (max-width: 480px) {
  .card { padding: var(--space-3); }
}

h1, h2 {
  font-family: var(--font-heading);
  color: var(--color-text);
  font-weight: 600;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

h1 { font-size: 1.625rem; line-height: 1.25; margin-top: 0; }
h2 { font-size: 1.15rem; line-height: 1.3; margin: 0 0 var(--space-1); }

p { margin-top: 0; }

a { color: var(--color-primary); }
a:hover { color: var(--color-primary-hover); }

.icon { display: inline-block; flex: none; vertical-align: -0.2em; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-control);
  border: 1px solid transparent;
  cursor: pointer;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  margin: var(--space-1) var(--space-2) var(--space-1) 0;
  transition: background-color 150ms var(--ease), border-color 150ms var(--ease),
    color 150ms var(--ease), transform 150ms var(--ease);
}

.btn:active:not(:disabled) { transform: scale(0.98); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary { background: var(--color-primary); color: var(--color-surface); }
.btn-primary:hover:not(:disabled) { background: var(--color-primary-hover); }

.btn-secondary {
  background: var(--color-primary-soft);
  color: var(--color-primary);
  border-color: var(--color-primary-border);
}
.btn-secondary:hover:not(:disabled) { background: var(--color-primary-border); }

.btn-danger { background: var(--color-error); color: var(--color-surface); }
.btn-danger:hover:not(:disabled) { background: #b91c1c; }

.btn-link {
  background: none;
  color: var(--color-primary);
  min-height: 44px;
  padding: var(--space-1) 0;
  text-decoration: none;
}
.btn-link:hover:not(:disabled) { color: var(--color-primary-hover); text-decoration: underline; }

/* ---------- Forms ---------- */
label {
  display: block;
  margin-bottom: var(--space-3);
  font-size: 0.9rem;
  font-weight: 600;
}

input, select, textarea {
  width: 100%;
  min-height: 44px;
  padding: var(--space-2) 12px;
  margin-top: var(--space-1);
  border: 1px solid var(--color-input-border);
  border-radius: var(--radius-control);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 150ms var(--ease), box-shadow 150ms var(--ease);
}

input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.25);
}

input[type="radio"], input[type="checkbox"] {
  width: 20px;
  min-height: 20px;
  height: 20px;
  margin: 0;
  padding: 0;
  flex: none;
  accent-color: var(--color-primary);
}

textarea { min-height: 88px; }

:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

.error { color: var(--color-error); }
.success { color: var(--color-success); }
.muted { color: var(--color-muted-text); font-size: 0.9rem; }

/* ---------- Quiz choices ---------- */
.choice-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: var(--space-2);
  padding: 12px var(--space-3);
  min-height: 48px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-control);
  background: var(--color-surface);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 150ms var(--ease), background-color 150ms var(--ease);
}
.choice-row:hover { border-color: var(--color-primary); background: var(--color-primary-soft); }
.choice-row:has(input:checked) {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
}

/* ---------- Lists ---------- */
.list-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
  gap: var(--space-2);
}
.list-item:last-child { border-bottom: none; }

/* ---------- Role select ---------- */
.role-grid { display: grid; gap: var(--space-3); margin-top: var(--space-4); }

.role-option {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  min-height: 72px;
  padding: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: border-color 150ms var(--ease), background-color 150ms var(--ease);
}
.role-option:hover { border-color: var(--color-primary); background: var(--color-primary-soft); }

.role-icon {
  flex: none;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  display: grid;
  place-items: center;
}

.role-text { flex: 1; display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.role-text strong { font-family: var(--font-heading); font-size: 1.05rem; font-weight: 600; }
.role-chevron { color: var(--color-muted-text); }

/* ---------- Status pill & progress ---------- */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  line-height: 1.6;
  background: var(--color-neutral-soft);
  color: var(--color-neutral-text);
}
.pill-soon { background: var(--color-warning-soft); color: var(--color-warning); }
.pill-overdue { background: var(--color-error-soft); color: var(--color-error); }
.pill-complete { background: var(--color-success-soft); color: var(--color-success); }

.progress {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: var(--space-2) 0 var(--space-1);
}
.progress-track {
  flex: 1;
  height: 6px;
  border-radius: 999px;
  background: var(--color-neutral-soft);
  overflow: hidden;
}
.progress-fill {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 999px;
  background: var(--color-primary);
  transform: scaleX(var(--p, 0));
  transform-origin: left;
  transition: transform 300ms var(--ease);
}
.progress-fill.is-complete { background: var(--color-success); }
.progress-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-muted-text);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* ---------- Homework ---------- */
.search-field { position: relative; margin-bottom: var(--space-3); }
.search-field .icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  margin-top: 2px;
  color: var(--color-muted-text);
  pointer-events: none;
}
.search-field input { padding-left: 40px; margin-top: 0; }

.task-num {
  flex: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-neutral-soft);
  color: var(--color-neutral-text);
  font-size: 0.8rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

.task-info { flex: 1; min-width: 0; }
.task-info > span { display: block; }
.task-info .task-category {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-primary);
}
.task-info .task-title { font-weight: 600; }
.task-info .task-detail { margin-top: 2px; }
.task-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 4px;
  font-weight: 600;
  font-size: 0.9rem;
}

.week-chip-bar {
  display: flex;
  gap: var(--space-2);
  overflow-x: auto;
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-2);
  -webkit-overflow-scrolling: touch;
}

.week-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex: none;
  min-height: 40px;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color 150ms var(--ease), border-color 150ms var(--ease);
}
.week-chip:hover { border-color: var(--color-primary); }
.week-chip[aria-current="true"] {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: var(--color-surface);
}

.week-chip .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex: none;
  box-shadow: 0 0 0 2px var(--color-surface);
}

.dot-complete { background: var(--color-success); }
.dot-progress { background: var(--color-warning); }
.dot-overdue { background: var(--color-error); }
.dot-pending { background: var(--color-muted-text); }

.week-header-btn {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-2);
  width: 100%;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  text-align: left;
  font: inherit;
  color: inherit;
  min-height: 44px;
}

.week-header-btn .chevron {
  flex: none;
  margin-top: 2px;
  color: var(--color-muted-text);
  transition: transform 150ms var(--ease);
}

.week-header-btn[aria-expanded="true"] .chevron { transform: rotate(90deg); }

.week-heading { margin: 0; font-size: inherit; }
.week-header-main { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 2px; }
.week-title { font-family: var(--font-heading); font-size: 1.15rem; font-weight: 600; line-height: 1.3; letter-spacing: -0.01em; }
.week-dates { font-weight: 400; }
.week-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 6px; }
.week-header-main .progress { font-weight: 400; }

.week-note {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  margin: var(--space-3) 0 var(--space-2);
  padding: 10px 12px;
  border-radius: var(--radius-control);
  background: var(--color-neutral-soft);
  color: var(--color-neutral-text);
  font-size: 0.9rem;
}
.week-note .icon { margin-top: 3px; }

/* ---------- User menu ---------- */
.avatar {
  flex: none;
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-surface);
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.avatar-lg { width: 44px; height: 44px; font-size: 1rem; }
.avatar-xl { width: 96px; height: 96px; font-size: 1.75rem; }
.avatar { overflow: hidden; }
.avatar img { display: block; width: 100%; height: 100%; object-fit: cover; }
.avatar-preview-row { display: flex; align-items: center; gap: var(--space-3); width: 100%; margin: var(--space-2) 0; }
.avatar-preview-actions { display: flex; flex-direction: column; align-items: flex-start; gap: var(--space-1); }
.avatar-preview-actions .btn { margin: 0; }

.user-menu { position: relative; }

.user-trigger {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 4px 10px 4px 6px;
  background: none;
  border: 1px solid transparent;
  border-radius: 999px;
  color: var(--color-text);
  font: inherit;
  cursor: pointer;
  transition: background-color 150ms var(--ease);
}
.user-trigger:hover, .user-trigger[aria-expanded="true"] { background: var(--color-neutral-soft); }
.user-trigger .icon { color: var(--color-muted-text); transition: transform 150ms var(--ease); }
.user-trigger[aria-expanded="true"] .icon { transform: rotate(180deg); }
.user-trigger-name {
  max-width: 140px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.9rem;
  font-weight: 600;
}

.user-panel {
  position: absolute;
  right: 0;
  top: calc(100% + 6px);
  z-index: 30;
  width: 260px;
  padding: var(--space-2);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.14);
  animation: modal-in 150ms var(--ease);
  transform-origin: top right;
}
.user-panel-head { display: flex; align-items: center; gap: 12px; padding: var(--space-2); }
.user-panel-id { display: flex; flex-direction: column; min-width: 0; }
.user-panel-id strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.menu-sep { height: 1px; margin: 6px calc(var(--space-2) * -1); background: var(--color-border); }
.menu-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  min-height: 44px;
  padding: 0 10px;
  background: none;
  border: none;
  border-radius: var(--radius-control);
  color: var(--color-text);
  font: inherit;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
}
.menu-item .icon { color: var(--color-muted-text); }
.menu-item:hover, .menu-item:focus-visible { background: var(--color-primary-soft); }
.menu-item:focus-visible { outline-offset: -2px; }

.modal-body label { width: 100%; margin-bottom: var(--space-2); }
.modal-icon.modal-icon-primary { background: var(--color-primary-soft); color: var(--color-primary); }
.modal-icon.modal-icon-success { background: var(--color-success-soft); color: var(--color-success); }

/* ---------- Modal dialog ---------- */
.modal {
  width: calc(100% - 32px);
  max-width: 420px;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.25);
}
.modal::backdrop { background: rgba(15, 23, 42, 0.5); }
.modal[open] { animation: modal-in 200ms var(--ease); }
@keyframes modal-in {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}

.modal-body { display: flex; flex-direction: column; align-items: flex-start; gap: var(--space-2); padding: var(--space-4); }
.modal-body h2 { margin: 0; font-size: 1.25rem; }
.modal-body p { margin: 0; }
.modal-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-warning-soft);
  color: var(--color-warning);
  display: grid;
  place-items: center;
  margin-bottom: var(--space-1);
}
.modal-detail {
  width: 100%;
  padding: 10px 12px;
  border-radius: var(--radius-control);
  background: var(--color-neutral-soft);
  font-weight: 600;
}
.modal-actions { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: var(--space-2); width: 100%; margin-top: var(--space-2); }
.modal-actions .btn { margin: 0; }

.task-actions { display: flex; flex-direction: column; align-items: stretch; gap: var(--space-1); flex: none; }
.task-actions .btn { margin: 0; }
.task-actions .btn-link { font-size: 0.875rem; }
.list-item.is-na .task-title { color: var(--color-muted-text); }
.task-info .task-na-at { margin-top: 4px; color: var(--color-muted-text); font-size: 0.85rem; font-weight: 600; }
.task-info .task-done-at { margin-top: 4px; color: var(--color-success); font-size: 0.85rem; font-weight: 600; }
.task-done-at .icon { vertical-align: -0.2em; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

/* ---------- Homework: PDF-style document ---------- */
.hw-doc {
  padding: var(--space-3);
  background: #ffffff;
  border: 1px solid var(--color-border);
  color: #000000;
  font-family: Carlito, Calibri, "Segoe UI", Arial, sans-serif;
  font-size: 0.95rem;
  line-height: 1.35;
}
.hw-doc .hl { background: #ffff00; }
.hw-doc .hlg { background: #00ff00; }
.hw-doc .red { color: #ff0000; }
.hw-doc a { color: #0563c1; overflow-wrap: anywhere; }
.hw-doc ol, .hw-doc ul { margin: 0.2em 0; padding-left: 2em; }
.hw-doc ul.sq { list-style: square; }
.hw-doc li.red { color: #ff0000; }
.hw-preface { margin: 0 0 var(--space-3); font-size: 0.85rem; }
.hw-title {
  margin: 0 0 var(--space-3);
  text-align: center;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  text-decoration: underline;
  color: #000000;
}
.hw-table-wrap { overflow-x: auto; }
.hw-table { width: 100%; min-width: 620px; border-collapse: collapse; table-layout: fixed; }
.hw-table th, .hw-table td { border: 1px solid #000000; padding: 4px 6px; vertical-align: top; text-align: left; }
.hw-table th.hw-head, .hw-table th.hw-head-col { border-bottom: 2px solid #000000; font-weight: 700; }
.hw-table th.hw-label { font-weight: 400; }
.hw-table td.hw-content { text-align: justify; }
.hw-table tr.is-na td, .hw-table tr.is-na th { color: #6b6b6b; text-decoration: line-through; }
.hw-table tr.is-na .hl, .hw-table tr.is-na .hlg { background: none; }

.hw-table tr.hw-controls td {
  border-top: none;
  background: var(--color-neutral-soft);
  font-family: var(--font-body);
  padding: var(--space-2) 6px;
}
.hw-controls-inner { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2) var(--space-3); }
.hw-buttons { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); }
.hw-buttons .btn { margin: 0; min-height: 40px; }
.hw-status { font-size: 0.9rem; color: var(--color-neutral-text); }
.hw-status-done strong { color: var(--color-success); }
.hw-footer { margin: var(--space-3) 0 0; font-size: 1.05rem; font-weight: 700; }

.hw-summary { margin-bottom: var(--space-3); }
.hw-summary-top { display: flex; flex-wrap: wrap; align-items: flex-start; justify-content: space-between; gap: var(--space-2); }
.hw-summary .week-title { display: block; }
.hw-doc a.hw-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 2px 0;
  padding: 6px 12px;
  border: 1px solid var(--color-primary-border);
  border-radius: var(--radius-control);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
}
.hw-doc a.hw-link-btn:hover { background: var(--color-primary-border); }

/* ---------- Homework attachments ---------- */
.hw-attach { flex: 1 1 100%; margin-top: var(--space-1); }
.hw-attach-zone {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  padding: 10px 12px;
  border: 2px dashed var(--color-input-border);
  border-radius: var(--radius-control);
  background: var(--color-surface);
  color: var(--color-neutral-text);
  font-size: 0.9rem;
}
.hw-attach-zone:focus-visible, .hw-attach-zone.is-over { border-color: var(--color-primary); background: var(--color-primary-soft); }
.hw-attach-zone.is-busy { opacity: 0.6; pointer-events: none; }
.hw-attach-zone .btn { margin: 0; min-height: 36px; padding: 4px 12px; font-size: 0.9rem; }
.hw-attach-text { display: inline-flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.hw-attach-text kbd {
  padding: 0 6px;
  border: 1px solid var(--color-input-border);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: var(--color-neutral-soft);
  font: inherit;
  font-size: 0.8rem;
  font-weight: 600;
}
.hw-thumbs { display: flex; flex-wrap: wrap; gap: var(--space-2); margin: var(--space-2) 0 0; padding: 0; list-style: none; }
.hw-thumbs li { position: relative; }
.hw-thumb {
  display: block;
  width: 88px;
  height: 88px;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-control);
  overflow: hidden;
  background: var(--color-surface);
  cursor: pointer;
}
.hw-thumb img { display: block; width: 100%; height: 100%; object-fit: cover; }
.hw-thumb:hover { border-color: var(--color-primary); }
.hw-thumb-del {
  position: absolute;
  top: -8px;
  right: -8px;
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-surface);
  color: var(--color-neutral-text);
  cursor: pointer;
}
.hw-thumb-del:hover { background: var(--color-error-soft); color: var(--color-error); border-color: var(--color-error); }
.modal-wide { max-width: min(900px, calc(100% - 32px)); }
.viewer-body { align-items: stretch; }
.viewer-stage { display: grid; place-items: center; min-height: 120px; }
.viewer-stage img { max-width: 100%; max-height: 70vh; border-radius: var(--radius-control); }

/* ---------- Teacher homework table ---------- */
.tbl-wrap { overflow-x: auto; }
.tbl { width: 100%; min-width: 640px; border-collapse: collapse; font-size: 0.9rem; }
.tbl th, .tbl td { padding: 10px 8px; border-bottom: 1px solid var(--color-border); text-align: left; vertical-align: top; }
.tbl th { font-size: 0.75rem; letter-spacing: 0.04em; text-transform: uppercase; color: var(--color-muted-text); }
.tbl .tbl-time { font-variant-numeric: tabular-nums; }
.tbl .hw-thumbs { margin: 0; }
.tbl .hw-thumb { width: 64px; height: 64px; }

/* ---------- Homework time summary ---------- */
.hw-time-summary { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-2); margin-top: var(--space-2); }
.hw-time-summary .btn { min-height: 40px; margin: 0; }
.hw-time-details { margin-top: var(--space-2); }
.tbl-compact { min-width: 520px; }
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* Telegram notifications dialog */
.tg-help { width: 100%; font-size: 0.9rem; color: var(--color-muted-text); }
.tg-help summary { cursor: pointer; color: var(--color-primary); font-weight: 600; }
.tg-help ol { margin: var(--space-2) 0 0; padding-left: 1.2rem; display: grid; gap: var(--space-1); }
.tg-help code { background: var(--color-primary-soft); padding: 0 4px; border-radius: 4px; }
.tg-chats { list-style: none; margin: 0; padding: 0; width: 100%; display: grid; gap: var(--space-1); }
.modal-actions [data-remove] { margin-right: auto; }
.secret-input { -webkit-text-security: disc; }
.tg-note { font-size: 0.85rem; margin: 0; }
.tg-chat { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-2);
  padding: var(--space-2) var(--space-3); border: 1px solid var(--color-border); border-radius: var(--radius-control); }
.tg-chat-info { display: flex; flex-direction: column; min-width: 0; }
.tg-chat-id { font-variant-numeric: tabular-nums; user-select: all; }
.tg-chat-actions { display: flex; flex-wrap: wrap; gap: var(--space-1); }
.tg-chat-actions .btn { margin: 0; min-height: 36px; padding: var(--space-1) var(--space-2); font-size: 0.9rem; }
.tg-help p { margin-top: var(--space-2); }