/* One learning-first workspace. Landing and grading logic are deliberately untouched. */
.study-cabinet {
  --cream: #f7f5ef;
  --paper: #fffdf9;
  --sidebar: #f3f0e9;
  --ink: #18212f;
  --ink-soft: #606b7c;
  --muted: #606b7c;
  --line: #dcd8ce;
  --amber-deep: #844910;
  --sans: "Onest", "Golos Text", ui-sans-serif, system-ui, sans-serif;
  --reading: Georgia, "Times New Roman", serif;
  --status-steady: #246a63;
  --status-practice: #945415;
  --status-developing: #365f87;
  --status-unknown: #878a8c;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --radius-control: 7px;
  --radius-message: 12px;
  --radius-composer: 16px;
  color: var(--ink);
  font: 15px/1.6 var(--sans);
  color-scheme: light;
}
.study-cabinet :focus-visible { outline: 3px solid var(--amber-deep); outline-offset: 3px; }
.study-cabinet .clean-progress-map { display: block; }
.study-cabinet .clean-progress-topic { border-bottom: 1px solid var(--line); padding-block: var(--space-3); }
.study-cabinet .clean-progress-topic > summary {
  display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-4); align-items: baseline;
  min-height: 48px; padding: var(--space-3) var(--space-2); cursor: pointer;
}
.study-cabinet .clean-progress-topic > summary::before { content: "+"; width: 1em; color: var(--muted); }
.study-cabinet .clean-progress-topic[open] > summary::before { content: "−"; }
.study-cabinet .clean-progress-topic > summary strong { flex: 1 1 260px; }
.study-cabinet .clean-progress-topic > summary .progress-signal-label { flex: 0 1 300px; font-size: 14px; }
.study-cabinet .clean-progress-topic > summary:hover { background: var(--paper); }
.study-cabinet .clean-progress-topic > summary:active { background: var(--sidebar); }
.study-cabinet .clean-progress-topic[data-signal="practice"] > summary .progress-signal-label { color: var(--status-practice); }
.study-cabinet .clean-progress-topic[data-signal="steady"] > summary .progress-signal-label { color: var(--status-steady); }
.study-cabinet .clean-progress-topic[data-signal="developing"] > summary .progress-signal-label { color: var(--status-developing); }
.study-cabinet .clean-progress-topic[data-signal="unknown"] > summary .progress-signal-label { color: var(--muted); }
.study-cabinet .clean-progress-topic .progress-skill-list { padding-inline: var(--space-6); }
.study-cabinet .clean-progress-works { padding: var(--space-3) var(--space-6) var(--space-6); }
.study-cabinet .clean-progress-works a { display: inline-flex; align-items: center; min-height: 44px; color: var(--ink); }
.study-cabinet .clean-progress-empty { margin-block: var(--space-6); max-width: 65ch; }
.study-cabinet .clean-progress-topic .progress-fact, .study-cabinet .clean-progress-topic .progress-caption { padding-inline: var(--space-2); }
.study-cabinet .app-sidebar { background: var(--sidebar); padding-top: var(--space-8); }
.study-cabinet .sidebar-intro { padding-top: var(--space-12); padding-bottom: var(--space-6); color: var(--muted); }
.study-cabinet .sidebar-nav { display: flex; flex-direction: column; gap: 0; }
.study-cabinet .sidebar-nav a, .study-cabinet .cabinet-menu-nav a,
.study-cabinet .cabinet-extra-nav button {
  display: flex; align-items: center; min-height: 48px; padding: var(--space-3) var(--space-4);
  border: 0; border-radius: var(--radius-control); color: var(--muted); background: transparent;
  font: 15px/1.45 var(--sans); text-align: left; text-decoration: none; box-shadow: none;
}
.study-cabinet .cabinet-primary-nav a { font-size: 17px; color: var(--ink); font-weight: 550; margin-bottom: var(--space-2); }
.study-cabinet .sidebar-nav a:hover, .study-cabinet .cabinet-menu-nav a:hover { background: var(--cream); }
.study-cabinet .sidebar-nav [aria-current="page"], .study-cabinet .cabinet-menu-nav [aria-current="page"] {
  background: var(--paper); color: var(--ink); font-weight: 650; box-shadow: inset 3px 0 var(--amber-deep);
}
.study-cabinet .cabinet-practice { margin-top: var(--space-8); }
.study-cabinet .cabinet-practice summary { padding: var(--space-3) var(--space-4); min-height: 48px; font-size: 14px; color: var(--muted); cursor: pointer; }
.study-cabinet .cabinet-practice a { margin-left: var(--space-4); }
.study-cabinet .cabinet-extra-nav { margin-top: var(--space-6); padding-top: var(--space-4); border-top: 1px solid var(--line); }
.study-cabinet .cabinet-profile-link { margin-top: var(--space-8); border-top: 1px solid var(--line); }
.study-cabinet .cabinet-menu { background: var(--cream); }
.study-cabinet .app-topbar { background: var(--cream); backdrop-filter: none; }
.study-cabinet .app-topbar h1 { font: 650 20px/1.4 var(--sans); letter-spacing: -.025em; }
.study-cabinet .small-button { border-radius: var(--radius-control); box-shadow: none; color: var(--ink); background: var(--paper); min-height: 44px; }
.study-cabinet .small-button.primary { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.study-cabinet .small-button:disabled { color: var(--muted); background: var(--sidebar); border-color: var(--line); }
.study-cabinet .dashboard-page { max-width: 1100px; padding: var(--space-12) clamp(20px, 5vw, 72px) 96px; }
.study-cabinet .dashboard-heading { display: block; margin-bottom: var(--space-8); }
.study-cabinet .dashboard-heading h2, .study-cabinet .chat-welcome h2 { font: 36px/1.2 var(--reading); letter-spacing: 0; margin: var(--space-2) 0 var(--space-6); }
.study-cabinet .dashboard-heading p { max-width: 65ch; color: var(--muted); }
.study-cabinet .eyebrow { font: 12px/1.5 var(--sans); letter-spacing: 0; text-transform: none; }
.study-cabinet .chat-welcome h2 br { display: none; }
.study-cabinet .chat-column { padding-top: var(--space-12); }
.study-cabinet .agent-block, .study-cabinet .feedback-message, .study-cabinet .problem-statement { font: 18px/1.8 var(--reading); color: var(--ink); }
.study-cabinet .agent-label { font: 600 17px/1.4 var(--sans); }
.study-cabinet .student-message { box-shadow: none; border-radius: var(--radius-message); background: var(--sidebar); }
.study-cabinet .composer { box-shadow: none; background: var(--paper); border-radius: var(--radius-composer); }
.study-cabinet .history-card { background: transparent; border: 0; border-top: 1px solid var(--line); border-radius: 0; box-shadow: none; padding: var(--space-6) 0; }
.study-cabinet .history-card:hover { background: var(--paper); }
.study-cabinet .history-card h3 { font: 600 17px/1.5 var(--sans); letter-spacing: 0; }
.study-cabinet .worksheet-form { box-shadow: none; background: transparent; border-radius: 0; border-inline: 0; }
.study-cabinet .worksheet-card { box-shadow: none; border-radius: 0; border-inline: 0; background: transparent; }
.study-cabinet .inspector h2 { font: 600 20px/1.4 var(--sans); letter-spacing: 0; }
.study-cabinet .progress-history-link { display: inline-block; min-height: 44px; padding-block: var(--space-2); color: var(--ink); text-underline-offset: 4px; }
.study-cabinet .progress-overview { display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-6); font-size: 14px; color: var(--muted); margin-bottom: var(--space-6); }
.study-cabinet .progress-toolbar { display: flex; flex-wrap: wrap; gap: var(--space-4); align-items: end; padding-bottom: var(--space-4); border-bottom: 1px solid var(--line); }
.study-cabinet .progress-tabs { display: flex; flex-wrap: wrap; gap: var(--space-2); flex: 1 0 100%; }
.study-cabinet .progress-tabs [aria-pressed="true"] { color: var(--paper); background: var(--ink); border-color: var(--ink); }
.study-cabinet .progress-field { display: grid; gap: var(--space-1); min-width: 0; }
.study-cabinet .progress-field label { font-size: 12px; color: var(--muted); }
.study-cabinet .progress-field select { max-width: 100%; min-height: 44px; padding: var(--space-2); background: var(--paper); color: var(--ink); border: 1px solid var(--line); border-radius: var(--radius-control); }
.study-cabinet .progress-legend { display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-6); list-style: none; padding: 0; margin: var(--space-6) 0 var(--space-3); font-size: 12px; color: var(--muted); }
.study-cabinet .progress-legend li { display: inline-flex; align-items: center; gap: var(--space-2); }
.study-cabinet [data-signal="steady"] { --signal: var(--status-steady); }
.study-cabinet [data-signal="practice"] { --signal: var(--status-practice); }
.study-cabinet [data-signal="developing"] { --signal: var(--status-developing); }
.study-cabinet [data-signal="unknown"] { --signal: var(--status-unknown); }
.study-cabinet .progress-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--signal); flex: none; }
.study-cabinet .progress-context { font-size: 13px; color: var(--muted); margin-bottom: var(--space-8); max-width: 65ch; }
.study-cabinet .progress-workspace { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--space-8); align-items: start; }
.study-cabinet .progress-workspace.has-detail { grid-template-columns: minmax(0, 1fr) minmax(300px, 360px); }
.study-cabinet .progress-map { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: var(--space-8); row-gap: 0; }
.study-cabinet .progress-topic { display: flex; flex-direction: column; gap: var(--space-3); width: 100%; min-width: 0; padding: var(--space-6) var(--space-2); text-align: left; border: 0; border-top: 1px solid var(--line); border-radius: 0; background: transparent; color: var(--ink); font: inherit; }
.study-cabinet .progress-topic:hover, .study-cabinet .progress-topic[aria-expanded="true"] { background: var(--paper); }
.study-cabinet .progress-topic-title { font-size: 18px; font-weight: 600; line-height: 1.4; }
.study-cabinet .progress-topic-title::after { content: "↗"; margin-left: var(--space-2); color: var(--muted); font-weight: 400; }
.study-cabinet .progress-topic-summary { font-size: 13px; color: var(--muted); line-height: 1.6; }
.study-cabinet .progress-segments { display: flex; gap: 3px; width: 100%; height: 8px; overflow: hidden; border-radius: 2px; }
.study-cabinet .progress-segments > span { min-width: 3px; flex-basis: 0; background: var(--signal); }
.study-cabinet .progress-detail { position: sticky; top: 104px; min-width: 0; max-height: calc(100dvh - 128px); overflow: auto; scrollbar-gutter: stable; border-left: 1px solid var(--line); padding-left: var(--space-6); }
.study-cabinet .progress-detail-heading { display: flex; justify-content: space-between; align-items: start; gap: var(--space-3); }
.study-cabinet .progress-detail-heading h2 { margin: 0 0 var(--space-3); font: 25px/1.35 var(--reading); overflow-wrap: anywhere; }
.study-cabinet .progress-unit-title { font: 600 15px/1.5 var(--sans); margin: var(--space-8) 0 var(--space-4); }
.study-cabinet .progress-skill-list { list-style: none; padding: 0; margin: 0; }
.study-cabinet .progress-skill { padding: var(--space-4) 0 var(--space-4) var(--space-3); border-left: 3px solid var(--signal); margin-bottom: var(--space-4); }
.study-cabinet .progress-skill strong { font-weight: 600; font-size: 14px; }
.study-cabinet .progress-skill p { margin: var(--space-2) 0 0; }
.study-cabinet .progress-signal-label { color: var(--signal); font-size: 13px; font-weight: 600; }
.study-cabinet .progress-skill[data-signal="unknown"] .progress-signal-label { color: var(--muted); }
.study-cabinet .progress-fact { font-size: 14px; }
.study-cabinet .progress-caption { color: var(--muted); font-size: 12px; }
.study-cabinet .progress-confirmed { color: var(--status-steady); font-size: 12px; }
.study-cabinet .progress-score-detail { margin-top: var(--space-2); font-size: 12px; }
.study-cabinet .progress-score-detail summary { min-height: 44px; padding: var(--space-2) 0; color: var(--muted); cursor: pointer; }
.study-cabinet .progress-work-link { display: block; font: 13px/1.6 var(--sans); min-height: 44px; padding: var(--space-2) 0; text-align: left; color: var(--ink); border: 0; background: transparent; text-underline-offset: 4px; }
.study-cabinet .progress-how { margin-top: var(--space-8); padding-top: var(--space-4); border-top: 1px solid var(--line); font-size: 13px; color: var(--muted); }
.study-cabinet .progress-how summary { min-height: 44px; cursor: pointer; }
.study-cabinet .progress-dialog { position: fixed; inset: 0; width: 100%; max-width: none; height: 100dvh; max-height: none; margin: 0; padding: var(--space-6); border: 0; border-radius: 0; overflow-y: auto; background: var(--cream); color: var(--ink); }
.study-cabinet .progress-dialog::backdrop { background: rgb(24 33 47 / 40%); }
.study-cabinet .progress-dialog[open] { display: block; }
.study-cabinet .progress-overview, .study-cabinet .progress-fact { font-variant-numeric: tabular-nums; }
@media (max-width: 1300px) { .study-cabinet .progress-workspace.has-detail .progress-map { grid-template-columns: minmax(0, 1fr); } }
@media (max-width: 900px) {
  .study-cabinet .progress-workspace.has-detail { grid-template-columns: minmax(0, 1fr); }
  .study-cabinet .progress-detail { display: none; }
}
@media (max-width: 700px) {
  .study-cabinet .dashboard-page { padding: var(--space-8) var(--space-4) 96px; }
  .study-cabinet .dashboard-heading h2, .study-cabinet .chat-welcome h2 { font-size: 30px; }
  .study-cabinet .mobile-bottom-nav { grid-template-columns: repeat(4, minmax(0, 1fr)); background: var(--cream); padding-bottom: env(safe-area-inset-bottom, 0px); }
  .study-cabinet .mobile-bottom-nav button { min-height: 48px; padding: var(--space-2) var(--space-1); font: 12px/1.4 var(--sans); border-radius: var(--radius-control); }
  .study-cabinet .mobile-bottom-nav button[aria-current="page"] { background: var(--paper); color: var(--ink); font-weight: 650; box-shadow: inset 0 3px var(--amber-deep); }
  .study-cabinet .progress-map { grid-template-columns: minmax(0, 1fr); }
  .study-cabinet .progress-tabs { gap: var(--space-1); }
  .study-cabinet .progress-tabs button { font-size: 12px; padding-inline: var(--space-2); }
  .study-cabinet .progress-field { flex: 1 0 140px; }
  .study-cabinet .history-card { display: flex; flex-direction: column; align-items: start; gap: var(--space-3); }
}