* { box-sizing: border-box; }
:root {
  --bg: #f4f7f8;
  --surface: #ffffff;
  --surface-soft: #f7fafb;
  --ink: #17232d;
  --muted: #687782;
  --line: #dfe7eb;
  --primary: #2d668e;
  --primary-dark: #1f4b6c;
  --primary-soft: #e7f2f8;
  --success: #2f805d;
  --success-soft: #e7f5ec;
  --warning: #a56b20;
  --warning-soft: #fff6df;
  --danger: #a94444;
  --danger-soft: #fff0f0;
  --shadow: 0 10px 28px rgba(31, 62, 81, 0.08);
  --radius: 16px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--bg);
}
body { margin: 0; background: var(--bg); color: var(--ink); min-width: 320px; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: .55; }
.app-shell { min-height: 100vh; }
.topbar { background: var(--surface); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; }
.topbar-inner { max-width: 1180px; margin: 0 auto; padding: 14px 24px; display: flex; align-items: center; gap: 22px; }
.brand { display: flex; align-items: center; gap: 10px; border: 0; background: none; padding: 0; color: var(--ink); text-align: left; }
.brand-mark { width: 38px; height: 38px; border-radius: 12px; background: var(--primary); color: white; display: grid; place-items: center; font-weight: 800; letter-spacing: -.04em; }
.brand strong { display: block; font-size: 16px; line-height: 1.1; }
.brand small { display: block; color: var(--muted); margin-top: 3px; }
.nav { display: flex; gap: 4px; margin-left: auto; }
.nav button { background: transparent; border: 0; color: var(--muted); padding: 9px 12px; border-radius: 10px; font-weight: 650; }
.nav button:hover, .nav button.active { background: var(--primary-soft); color: var(--primary-dark); }
.main { max-width: 1180px; margin: 0 auto; padding: 34px 24px 70px; }
.page-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 20px; margin-bottom: 26px; }
.eyebrow { text-transform: uppercase; letter-spacing: .13em; font-size: 11px; font-weight: 800; color: var(--primary); margin: 0 0 8px; }
h1, h2, h3 { margin: 0; letter-spacing: -.03em; }
h1 { font-size: clamp(28px, 4vw, 42px); line-height: 1.05; }
h2 { font-size: 24px; }
h3 { font-size: 17px; }
.page-head p, .muted { color: var(--muted); }
.page-head p { margin: 10px 0 0; max-width: 700px; line-height: 1.55; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.btn { border: 1px solid transparent; background: var(--surface); color: var(--ink); border-radius: 11px; padding: 10px 15px; font-weight: 750; transition: .18s ease; }
.btn:hover { transform: translateY(-1px); box-shadow: 0 6px 16px rgba(20, 46, 62, .10); }
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { border-color: var(--line); }
.btn-ghost { background: transparent; color: var(--primary-dark); }
.btn-danger { background: var(--danger-soft); border-color: #f3cccc; color: var(--danger); }
.btn-small { padding: 7px 10px; font-size: 13px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.card-pad { padding: 22px; }
.stats-grid { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 14px; margin-bottom: 28px; }
.stat { padding: 18px; }
.stat-label { color: var(--muted); font-size: 13px; font-weight: 700; }
.stat-value { font-size: 30px; font-weight: 800; margin-top: 9px; letter-spacing: -.05em; }
.stat-note { color: var(--muted); font-size: 12px; margin-top: 5px; }
.section-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 26px 0 13px; }
.assignment-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 16px; }
.assignment-card { padding: 18px; display: flex; flex-direction: column; min-height: 218px; }
.assignment-card h3 { margin-top: 11px; line-height: 1.2; }
.assignment-card p { color: var(--muted); line-height: 1.45; margin: 8px 0 0; }
.assignment-meta { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 15px; }
.chip { display: inline-flex; align-items: center; gap: 5px; border-radius: 999px; padding: 5px 9px; background: var(--surface-soft); color: var(--muted); font-size: 12px; font-weight: 750; }
.chip-success { color: var(--success); background: var(--success-soft); }
.chip-warning { color: var(--warning); background: var(--warning-soft); }
.assignment-actions { margin-top: auto; padding-top: 18px; display: flex; flex-wrap: wrap; gap: 7px; }
.empty { padding: 42px 20px; text-align: center; color: var(--muted); }
.empty strong { display: block; color: var(--ink); font-size: 17px; margin-bottom: 7px; }
.editor-layout { display: grid; grid-template-columns: minmax(0, 1fr) 310px; gap: 18px; align-items: start; }
.editor-main, .editor-side { display: flex; flex-direction: column; gap: 14px; }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.panel h3 { margin-bottom: 14px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label { color: var(--muted); font-size: 12px; font-weight: 800; }
.field input, .field select, .field textarea, .text-input, .select-input { width: 100%; border: 1px solid var(--line); border-radius: 10px; padding: 11px 12px; background: white; color: var(--ink); outline: none; }
.field textarea { min-height: 90px; resize: vertical; line-height: 1.45; }
.field input:focus, .field select:focus, .field textarea:focus, .text-input:focus, .select-input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(45, 102, 142, .12); }
.form-grid { display: grid; grid-template-columns: 1.2fr .7fr 1fr; gap: 12px; }
.question-list { display: flex; flex-direction: column; gap: 14px; }
.question-card { padding: 18px; border: 1px solid var(--line); border-radius: 15px; background: var(--surface); box-shadow: 0 5px 17px rgba(31,62,81,.05); }
.question-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 15px; }
.question-title { display: flex; align-items: center; gap: 9px; font-weight: 800; }
.question-number { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 9px; background: var(--primary-soft); color: var(--primary-dark); }
.question-tools { display: flex; gap: 6px; flex-wrap: wrap; }
.question-tools button { border: 0; background: var(--surface-soft); color: var(--muted); border-radius: 8px; padding: 7px 9px; font-size: 12px; font-weight: 750; }
.question-tools button:hover { color: var(--primary-dark); background: var(--primary-soft); }
.question-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.question-grid .full { grid-column: 1 / -1; }
.image-dropzone { min-height: 120px; border: 1.5px dashed #b8cbd6; background: #f8fbfc; border-radius: 13px; display: grid; place-items: center; text-align: center; padding: 14px; color: var(--muted); position: relative; overflow: hidden; }
.image-dropzone.dragover { border-color: var(--primary); background: var(--primary-soft); }
.image-dropzone img { display: block; max-width: 100%; max-height: 240px; object-fit: contain; border-radius: 9px; }
.image-dropzone .image-overlay { position: absolute; bottom: 8px; right: 8px; display: flex; gap: 5px; }
.image-dropzone .image-overlay button { border: 0; border-radius: 8px; padding: 6px 8px; background: rgba(23,35,45,.8); color: white; font-size: 11px; }
.option-list { display: flex; flex-direction: column; gap: 8px; }
.option-row { display: grid; grid-template-columns: 28px 1fr auto; gap: 7px; align-items: center; }
.option-mark { width: 24px; height: 24px; display: grid; place-items: center; color: var(--muted); font-size: 12px; font-weight: 800; }
.option-row input[type="text"] { width: 100%; border: 1px solid var(--line); border-radius: 9px; padding: 9px 10px; }
.option-row input[type="radio"], .option-row input[type="checkbox"] { width: 17px; height: 17px; accent-color: var(--primary); }
.option-actions { display: flex; gap: 8px; margin-top: 9px; }
.link-btn { border: 0; background: transparent; color: var(--primary); font-weight: 750; padding: 5px 0; }
.link-btn:hover { color: var(--primary-dark); text-decoration: underline; }
.save-state { color: var(--muted); font-size: 12px; font-weight: 700; }
.sticky-actions { position: sticky; bottom: 14px; z-index: 2; background: rgba(255,255,255,.94); backdrop-filter: blur(9px); border: 1px solid var(--line); border-radius: 14px; padding: 10px; display: flex; justify-content: space-between; align-items: center; gap: 10px; box-shadow: var(--shadow); }
.callout { padding: 13px 15px; border-radius: 12px; background: var(--primary-soft); color: var(--primary-dark); line-height: 1.45; font-size: 13px; }
.callout-warning { background: var(--warning-soft); color: #805218; }
.callout-danger { background: var(--danger-soft); color: #823838; }
.student-shell { max-width: 820px; margin: 0 auto; }
.student-card { padding: 25px; }
.student-title { text-align: center; margin-bottom: 22px; }
.student-title p { color: var(--muted); margin: 8px 0 0; }
.student-question { padding: 19px 0; border-top: 1px solid var(--line); }
.student-question:first-child { border-top: 0; padding-top: 0; }
.student-question h3 { line-height: 1.4; margin-bottom: 12px; }
.student-question img { max-width: 100%; max-height: 360px; object-fit: contain; display: block; margin: 0 0 14px; border-radius: 12px; border: 1px solid var(--line); }
.student-options { display: grid; gap: 8px; }
.student-option { display: flex; gap: 10px; align-items: flex-start; padding: 12px; border: 1px solid var(--line); border-radius: 10px; cursor: pointer; }
.student-option:hover { border-color: #a4c2d3; background: #f9fcfd; }
.student-option input { margin-top: 3px; accent-color: var(--primary); }
.result-banner { text-align: center; padding: 24px; background: var(--success-soft); border-radius: 14px; color: #205c42; margin-bottom: 18px; }
.result-score { font-size: 42px; font-weight: 900; letter-spacing: -.06em; }
.result-list { display: grid; gap: 12px; }
.result-item { padding: 16px; border: 1px solid var(--line); border-radius: 13px; background: white; }
.result-item-top { display: flex; justify-content: space-between; gap: 12px; align-items: center; }
.result-item strong { font-size: 16px; }
.result-item p { margin: 7px 0 0; color: var(--muted); font-size: 13px; }
.result-detail { margin-top: 13px; padding-top: 12px; border-top: 1px solid var(--line); display: grid; gap: 9px; }
.answer-line { display: grid; grid-template-columns: 1fr auto; gap: 12px; align-items: center; font-size: 13px; }
.answer-line .answer-status { font-weight: 800; }
.status-correct { color: var(--success); }
.status-wrong { color: var(--danger); }
.status-review { color: var(--warning); }
.modal-backdrop { position: fixed; inset: 0; background: rgba(10, 28, 39, .45); display: grid; place-items: center; padding: 20px; z-index: 30; }
.modal { width: min(760px, 100%); max-height: min(720px, 90vh); overflow: auto; background: white; border-radius: 18px; box-shadow: 0 24px 70px rgba(0,0,0,.22); padding: 22px; }
.modal-head { display: flex; justify-content: space-between; gap: 12px; align-items: center; margin-bottom: 15px; }
.modal-close { border: 0; background: var(--surface-soft); width: 34px; height: 34px; border-radius: 10px; font-size: 20px; color: var(--muted); }
.import-preview { margin-top: 14px; display: grid; gap: 8px; }
.import-item { padding: 10px 12px; border-radius: 10px; background: var(--surface-soft); font-size: 13px; }
.import-item.warning { background: var(--warning-soft); color: #805218; }
.footer-note { text-align: center; color: var(--muted); font-size: 12px; margin-top: 34px; }
@media (max-width: 900px) {
  .assignment-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .editor-layout { grid-template-columns: 1fr; }
  .editor-side { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); }
}
@media (max-width: 640px) {
  .topbar-inner { padding: 12px 15px; flex-wrap: wrap; gap: 12px; }
  .nav { width: 100%; overflow-x: auto; order: 3; margin-left: 0; }
  .nav button { white-space: nowrap; }
  .main { padding: 24px 15px 50px; }
  .page-head { flex-direction: column; }
  .page-head .actions { width: 100%; }
  .page-head .actions .btn { flex: 1; }
  .stats-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .assignment-grid { grid-template-columns: 1fr; }
  .form-grid, .question-grid { grid-template-columns: 1fr; }
  .question-grid .full { grid-column: auto; }
  .editor-side { display: flex; }
  .student-card { padding: 18px; }
  .sticky-actions { flex-direction: column; align-items: stretch; }
  .sticky-actions .actions { justify-content: stretch; }
  .sticky-actions .btn { flex: 1; }
}


/* LingvoLab v0.9.3 */
.ai-type-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:8px;margin-top:8px}
.ai-type-choice{display:flex;align-items:center;gap:8px;border:1px solid var(--line);border-radius:10px;padding:9px 10px;background:#fff;cursor:pointer}
.ai-type-choice input{width:auto;margin:0}
.ai-type-choice span{font-size:14px}
button:disabled{opacity:.55;cursor:not-allowed}


/* Два полноразмерных поля для сопоставления */
.option-row.matching-pair-row {
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) auto;
  margin-bottom: 8px;
}

.matching-pair-row > input {
  width: 100%;
  min-width: 0;
  box-sizing: border-box;
}

@media (max-width: 600px) {
  .option-row.matching-pair-row {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .matching-pair-row > button {
    grid-column: 1 / -1;
    justify-self: end;
  }
}