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h2{font-size:31px}.panel.wide{grid-column:auto}.settings-layout{grid-template-columns:1fr}.library-grid,.set-grid{grid-template-columns:1fr}.category-grid{grid-template-columns:repeat(2,1fr)}.toolbar-head,.detail-head,.admin-head{align-items:flex-start;flex-direction:column}.toolbar-actions,.detail-actions{width:100%}.toolbar-actions .search-input{flex:1}.mastery-grid{grid-template-columns:1fr 1fr}.admin-info{grid-template-columns:1fr}.create-bottom{align-items:stretch;flex-direction:column;gap:13px}.create-submit{text-align:left}.create-submit .primary{width:100%}.train-card{padding:23px}.train-card h2{font-size:20px}.question-row{grid-template-columns:34px 1fr}.question-actions{grid-column:2;justify-content:flex-end}}@media(max-width:520px){.stats-grid{grid-template-columns:1fr 1fr}.stats-grid article{padding:12px}.stat-icon{display:none}.hero-actions{flex-direction:column}.hero-actions button{width:100%}.hero-tags{display:grid;grid-template-columns:1fr 1fr}.form-grid,.choice-grid,.modal-grid{grid-template-columns:1fr}.category-grid{grid-template-columns:1fr}.mastery-grid{grid-template-columns:1fr 1fr}.top-chip small{display:none}.top-chip{display:flex}.top-actions #profileBtn{display:none}.detail-actions{display:grid;grid-template-columns:1fr 1fr}.detail-actions button{width:100%}.train-top{grid-template-columns:auto 1fr}.score-chip{display:none}.self-rate{align-items:stretch;flex-wrap:wrap}.self-rate span{width:100%;margin:0}.question-panel .panel-head{align-items:flex-start;flex-direction:column}.question-panel .search-input{width:100%}}

.boot-card{position:relative}.boot-loader{display:flex;align-items:center;gap:10px;padding:12px 14px;border-radius:12px;background:#f7f7fb;color:var(--muted);font-size:10px}.boot-loader i{width:16px;height:16px;border:2px solid #d7d9e3;border-top-color:var(--brand);border-radius:50%;animation:artilearnSpin .8s linear infinite}.boot-error{margin-top:12px;padding:12px 14px;border-radius:12px;background:#fff0f1;color:#9c3540;font-size:10px;line-height:1.55;white-space:pre-wrap}.boot-actions{margin-top:12px}.build-tag{display:block;margin-top:18px;color:#a2a8b5;font-size:8px;text-align:center}@keyframes artilearnSpin{to{transform:rotate(360deg)}}

/* =========================================================
   ArtiLearn 0.9.9 — Mobile-first polish
   ========================================================= */
@media (max-width: 820px) {
  html, body { overflow-x: hidden; }
  body { font-size: 15px; -webkit-text-size-adjust: 100%; }
  .app-shell { display:block; min-height:100dvh; }
  .app-shell main {
    padding: 0 14px calc(96px + env(safe-area-inset-bottom));
    width:100%; max-width:none;
  }

  /* sticky, compact app header */
  .topbar {
    position:sticky; top:0; z-index:8;
    height:72px; margin:0 -14px 10px; padding:0 14px;
    background:rgba(245,246,250,.94);
    -webkit-backdrop-filter:blur(16px); backdrop-filter:blur(16px);
    border-bottom:1px solid rgba(231,233,240,.9);
  }
  .topbar h1 { font-size:19px; letter-spacing:-.45px; margin:0; }
  .topbar p { display:none; }
  .top-actions { gap:6px; }
  .top-chip {
    height:38px; min-width:57px; padding:5px 9px;
    border-radius:12px; box-shadow:0 3px 12px rgba(25,30,55,.04);
  }
  .top-chip span { font-size:15px; }
  .top-chip b { font-size:12px; }
  .top-chip small { font-size:8px; }
  .top-actions .avatar { width:38px; height:38px; border-radius:12px; font-size:12px; }

  /* true mobile bottom navigation */
  .sidebar {
    position:fixed; inset:auto 0 0 0; width:100%;
    height:calc(68px + env(safe-area-inset-bottom));
    padding:6px 8px calc(6px + env(safe-area-inset-bottom));
    background:rgba(17,21,38,.97);
    -webkit-backdrop-filter:blur(18px); backdrop-filter:blur(18px);
    border-top:1px solid rgba(255,255,255,.08);
    box-shadow:0 -12px 34px rgba(11,14,28,.14);
    z-index:30;
  }
  .brand,.sidebar-bottom { display:none; }
  .sidebar nav { height:56px; display:grid; grid-template-columns:repeat(5,minmax(0,1fr)); gap:3px; }
  .nav-item {
    min-width:0; min-height:54px; padding:5px 2px 4px;
    border-radius:13px; display:flex; flex-direction:column;
    align-items:center; justify-content:center; gap:2px;
    text-align:center; color:#929bb2;
  }
  .nav-item span { width:auto; font-size:20px; line-height:1; }
  .nav-item b { font-size:10px; line-height:1.15; font-weight:750; white-space:nowrap; }
  .nav-item.active { background:#252b45; color:#fff; }

  /* readability and touch targets */
  button, .primary, .secondary, .ghost, .text-btn, .danger-soft, .success-soft { min-height:44px; }
  .primary,.secondary { border-radius:13px; padding:11px 14px; }
  .small { min-height:38px; padding:8px 11px; font-size:12px; }
  .field { margin-top:15px; }
  .field > span { font-size:12px; margin-bottom:7px; display:block; font-weight:750; color:#5e6678; }
  input, select, textarea, .search-input {
    width:100%; min-width:0; min-height:46px; font-size:16px;
    border-radius:12px; padding:11px 12px;
  }
  textarea { line-height:1.45; }
  .eyebrow { font-size:10px; letter-spacing:1.2px; }

  /* home */
  .hero-grid,.create-grid,.detail-grid { grid-template-columns:1fr; gap:12px; }
  .hero-card { min-height:auto; padding:23px 20px; border-radius:20px; }
  .hero-card h2 { font-size:31px; line-height:1.03; letter-spacing:-1.25px; margin:10px 0 12px; }
  .hero-card p { font-size:14px; line-height:1.55; margin:0; }
  .hero-actions { display:grid; grid-template-columns:1fr; gap:8px; margin-top:18px; }
  .hero-actions button { width:100%; }
  .hero-tags { display:grid; grid-template-columns:1fr 1fr; gap:6px; margin-top:15px; }
  .hero-tags span { font-size:11px; padding:8px 9px; border-radius:10px; }
  .quota-card {
    display:block; padding:17px 18px; border-radius:18px;
  }
  .quota-card .ring-wrap { display:none; }
  .quota-head h3 { font-size:16px; margin:3px 0 0; }
  .quota-head span,.quota-foot { font-size:10px; }
  .quota-foot { margin-top:13px; padding-top:11px; }
  .stats-grid { grid-template-columns:repeat(2,minmax(0,1fr)); gap:9px; margin:12px 0 22px; }
  .stats-grid article { min-height:92px; padding:13px; border-radius:16px; }
  .stats-grid article small { font-size:10px; line-height:1.2; }
  .stats-grid article strong { font-size:23px; margin:4px 0; }
  .stats-grid article span { font-size:9px; line-height:1.25; }
  .stat-icon { display:none; }
  .section-head { margin:20px 0 11px; }
  .section-head h2,.create-title h2,.detail-head h2,.admin-head h2 { font-size:22px; letter-spacing:-.5px; }
  .section-head p,.create-title p,.detail-head p,.admin-head p { font-size:12px; line-height:1.45; }
  .section-head.toolbar-head,.detail-head,.admin-head { align-items:stretch; flex-direction:column; gap:10px; }
  .toolbar-actions { width:100%; display:grid; grid-template-columns:1fr; gap:8px; }
  .toolbar-actions .primary { width:100%; }

  /* learning cards */
  .set-grid,.library-grid { grid-template-columns:1fr; gap:10px; }
  .set-card,.library-card { border-radius:17px; padding:15px; box-shadow:0 5px 18px rgba(25,30,55,.035); }
  .set-card { grid-template-columns:44px 1fr 44px; gap:10px; }
  .set-card h3,.library-card h3 { font-size:15px; line-height:1.3; }
  .set-card p,.library-card p { font-size:11px; }
  .set-card .subject-icon,.library-card .subject-icon { width:42px; height:42px; border-radius:12px; }
  .round-btn { width:42px; height:42px; min-height:42px; }
  .lib-actions { display:grid; grid-template-columns:1fr 1fr; gap:7px; }
  .lib-actions button { width:100%; }
  .lib-stats { gap:7px; }
  .lib-stats span { font-size:10px; }
  .progress-meta { font-size:10px; }

  /* categories */
  .category-grid { grid-template-columns:repeat(2,minmax(0,1fr)); gap:9px; }
  .category-card { padding:15px; border-radius:16px; min-width:0; }
  .category-card h3 { font-size:14px; overflow-wrap:anywhere; }
  .category-card p,.category-foot { font-size:10px; }

  /* create flow */
  .create-title { padding:4px 2px 10px; }
  .create-grid { gap:11px; }
  .panel { padding:17px; border-radius:18px; }
  .panel.wide { grid-column:auto; }
  .step-head { align-items:flex-start; margin-bottom:13px; }
  .step-head > span { flex:0 0 auto; }
  .step-head h3 { font-size:16px; margin-top:1px; }
  .step-head p { font-size:11px; line-height:1.35; }
  .form-grid,.settings-layout { grid-template-columns:1fr; gap:0; }
  .dropzone { padding:24px 14px; border-radius:16px; }
  .dropzone h3 { font-size:16px; }
  .dropzone p,.dropzone small { font-size:11px; }
  .upload-icon { font-size:27px; }
  .file-row { font-size:11px; padding:10px; }
  .choice-grid { grid-template-columns:1fr 1fr; gap:8px; }
  .choice { padding:12px 10px; min-height:74px; border-radius:13px; }
  .choice b { font-size:12px; line-height:1.25; }
  .choice small { font-size:10px; line-height:1.25; margin-top:4px; }
  .switch-row { padding:12px 0; }
  .switch-row b { font-size:12px; }
  .switch-row small { font-size:10px; line-height:1.3; }
  .create-bottom { align-items:stretch; flex-direction:column; gap:15px; }
  .segmented { display:grid; grid-template-columns:repeat(4,1fr); width:100%; }
  .segmented button { min-height:42px; font-size:12px; padding:8px 4px; }
  .create-submit { text-align:left; }
  .create-submit .primary { width:100%; min-height:50px; }
  .create-submit > span { font-size:10px; }

  /* set detail */
  .back-btn { min-height:36px; margin:0 0 8px; font-size:12px; }
  .detail-head { margin-bottom:11px; }
  .detail-actions { width:100%; display:grid; grid-template-columns:1fr 1fr; gap:7px; }
  .detail-actions button { width:100%; min-height:44px; font-size:11px; padding:9px 8px; }
  .detail-actions #detailStart { grid-column:1 / -1; min-height:48px; font-size:13px; }
  .mastery-grid { grid-template-columns:1fr 1fr; gap:8px; }
  .mastery-grid article { padding:13px; border-radius:15px; }
  .mastery-grid span { font-size:10px; }
  .mastery-grid strong { font-size:23px; }
  .mastery-grid small { font-size:9px; line-height:1.3; }
  .panel-head { align-items:flex-start; flex-direction:column; gap:9px; }
  .compact-checks { display:grid; grid-template-columns:1fr 1fr; width:100%; }
  .compact-check { min-height:42px; font-size:11px; padding:9px; }
  .source-row { padding:10px; font-size:11px; gap:8px; }
  .source-row small { font-size:9px; }
  .inline-upload textarea { min-height:90px; }
  .question-panel { margin-top:10px; }
  .question-panel .search-input { width:100%; }
  .question-row { grid-template-columns:42px 1fr; gap:9px; padding:11px; border-radius:13px; }
  .q-status { width:40px; height:40px; border-radius:11px; font-size:10px; }
  .question-row h4 { font-size:12px; line-height:1.4; margin-bottom:4px; }
  .question-row p { font-size:10px; line-height:1.35; }
  .question-actions { grid-column:1 / -1; justify-content:flex-end; border-top:1px solid #f0f1f4; padding-top:8px; }
  .question-actions button { min-height:36px; font-size:10px; }

  /* training: more like a native quiz app */
  .train-shell { max-width:none; }
  .train-top { grid-template-columns:auto 1fr; gap:10px; margin:5px 0 12px; }
  .train-top #trainExit { min-height:40px; padding:7px 5px; font-size:11px; }
  .train-progress span { font-size:10px; }
  .score-chip { display:none; }
  .train-card { min-height:0; padding:20px 16px; border-radius:20px; box-shadow:0 12px 34px rgba(25,30,55,.07); }
  .train-tags { gap:6px; flex-wrap:wrap; }
  .train-tags .pill { font-size:10px; padding:6px 9px; }
  .train-card h2 { font-size:20px; line-height:1.42; letter-spacing:-.2px; margin:20px 0; }
  .answer-area { gap:9px; }
  .answer-btn { min-height:58px; border-radius:14px; padding:11px 12px; font-size:14px; line-height:1.35; }
  .answer-btn .letter { width:34px; height:34px; flex:0 0 34px; }
  .free-answer { min-height:120px; font-size:16px; }
  .answer-submit { min-height:48px; width:100%; }
  .hint-box,.feedback-box { padding:13px; font-size:12px; line-height:1.55; }
  .self-rate { gap:7px; padding:11px; flex-wrap:wrap; }
  .self-rate span { width:100%; margin:0 0 2px; font-size:11px; }
  .self-rate button { flex:1; }
  #nextBtn { margin-top:10px; min-height:50px; }
  .train-note { font-size:10px; line-height:1.4; padding:0 8px; }

  /* Admin remains usable on mobile through deliberate horizontal table scrolling */
  .admin-info { grid-template-columns:1fr; gap:8px; }
  .admin-info article { padding:13px; border-radius:15px; }
  .admin-info span,.admin-info small { font-size:9px; }
  .admin-info b { font-size:12px; }
  .table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }
  .table-wrap table { min-width:760px; }

  /* native-feeling bottom sheet modals */
  .modal-backdrop {
    align-items:end; padding:0; background:rgba(10,13,25,.52);
  }
  .modal {
    width:100%; max-width:none; max-height:88dvh; border-radius:23px 23px 0 0;
    padding:18px 16px calc(18px + env(safe-area-inset-bottom));
    box-shadow:0 -20px 70px rgba(0,0,0,.2);
  }
  .modal-head { position:sticky; top:-18px; z-index:2; background:#fff; margin:-18px -16px 12px; padding:16px 16px 10px; border-radius:23px 23px 0 0; }
  .modal-head h3 { font-size:19px; }
  .modal-grid { grid-template-columns:1fr; gap:0; }
  .modal-actions { position:sticky; bottom:calc(-18px - env(safe-area-inset-bottom)); background:#fff; margin:16px -16px calc(-18px - env(safe-area-inset-bottom)); padding:10px 16px calc(12px + env(safe-area-inset-bottom)); display:grid; grid-template-columns:1fr 1fr; gap:8px; border-top:1px solid var(--line); }
  .modal-actions button:only-child { grid-column:1 / -1; }
  .icon-btn { min-height:38px; width:38px; }
  .toast { left:12px; right:12px; bottom:calc(82px + env(safe-area-inset-bottom)); max-width:none; padding:13px 14px; font-size:12px; line-height:1.4; border-radius:14px; }

  /* auth/setup */
  .auth-gate { min-height:100dvh; padding:14px; }
  .auth-card { width:100%; max-width:440px; padding:23px 19px; border-radius:22px; }
  .auth-copy { margin:22px 0 16px; }
  .auth-copy h1 { font-size:29px; }
  .auth-copy p,.form-error { font-size:11px; line-height:1.5; }
}

@media (max-width: 430px) {
  .app-shell main { padding-left:11px; padding-right:11px; }
  .topbar { margin-left:-11px; margin-right:-11px; padding-left:11px; padding-right:11px; }
  .topbar h1 { font-size:17px; }
  .top-actions { gap:4px; }
  .top-chip { min-width:50px; padding:5px 7px; }
  .top-chip small { display:none; }
  .top-actions #profileBtn { display:grid; }
  .hero-card { padding:20px 17px; }
  .hero-card h2 { font-size:28px; }
  .stats-grid { gap:7px; }
  .stats-grid article { padding:12px 10px; }
  .category-grid { grid-template-columns:1fr 1fr; }
  .choice-grid { grid-template-columns:1fr; }
  .choice { min-height:0; }
  .compact-checks { grid-template-columns:1fr; }
  .detail-actions { grid-template-columns:1fr 1fr; }
  .nav-item b { font-size:9px; }
  .nav-item span { font-size:19px; }
}
\n\n/* =========================================================\n   ArtiLearn 0.9.9 — Mobile correctness pass\n   Fixes iOS checkbox sizing, modal/nav overlap and overflow.\n   ========================================================= */\nbody.modal-open { overflow:hidden; }\n\n@media (max-width: 820px) {\n  /* Do not apply full-width text-field rules to checkboxes/radios. */\n  input[type="checkbox"], input[type="radio"] {\n    width:22px !important;\n    min-width:22px !important;\n    max-width:22px !important;\n    height:22px !important;\n    min-height:22px !important;\n    padding:0 !important;\n    margin:0 !important;\n    flex:0 0 22px;\n    accent-color:var(--brand);\n  }\n  .switch input[type="checkbox"] { display:none !important; width:0 !important; min-width:0 !important; height:0 !important; min-height:0 !important; }\n\n  /* Compact question-type selectors: never push labels off screen. */\n  .compact-checks {\n    display:grid !important;\n    grid-template-columns:repeat(2,minmax(0,1fr)) !important;\n    gap:8px !important;\n    width:100%;\n  }\n  .compact-check {\n    width:100%; min-width:0; min-height:54px;\n    display:grid !important; grid-template-columns:22px minmax(0,1fr);\n    align-items:center; justify-content:stretch; gap:10px;\n    padding:11px 12px !important; border-radius:13px;\n    font-size:13px !important; line-height:1.25;\n    overflow:hidden; overflow-wrap:anywhere;\n  }\n  .compact-check input { justify-self:start; }\n\n  /* Material rows keep file names and actions inside the viewport. */\n  .source-row {\n    display:grid !important; grid-template-columns:minmax(0,1fr) auto;\n    align-items:center; gap:8px; min-width:0; padding:11px 12px !important;\n  }\n  .source-row > div { min-width:0; }\n  .source-row > div:first-child { display:grid; grid-template-columns:auto minmax(0,1fr); gap:8px; }\n  .source-row > div:first-child span:last-child { display:block; min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }\n  .source-row > div:last-child { display:flex; align-items:center; justify-content:flex-end; gap:6px; white-space:nowrap; }\n  .source-row button { min-width:36px; min-height:36px; padding:4px; }\n\n  /* Dialogs must always sit above mobile navigation. */\n  .modal-backdrop { z-index:120 !important; align-items:end; padding:0; }\n  .modal {\n    max-height:min(92dvh, 900px) !important;\n    overscroll-behavior:contain;\n    padding-bottom:calc(78px + env(safe-area-inset-bottom)) !important;\n  }\n  .modal-head { z-index:4 !important; }\n  .modal-actions {\n    z-index:5 !important;\n    bottom:calc(-78px - env(safe-area-inset-bottom)) !important;\n    margin-bottom:calc(-78px - env(safe-area-inset-bottom)) !important;\n    padding:12px 16px calc(14px + env(safe-area-inset-bottom)) !important;\n    min-height:68px;\n  }\n  .modal-actions button { min-height:48px; font-size:14px; }\n  body.modal-open .sidebar { visibility:hidden; pointer-events:none; }\n\n  /* Settings sections stay readable and switches remain reachable. */\n  .switch-row { display:grid; grid-template-columns:minmax(0,1fr) auto; gap:14px; align-items:center; }\n  .switch-row > div { min-width:0; }\n  .switch-row b,.switch-row small { overflow-wrap:anywhere; }\n  .panel-head #saveSetSettings { align-self:flex-start; }\n\n  /* During a quiz the persistent navigation is distracting and can cover controls. */\n  body.training-mode .sidebar { display:none !important; }\n  body.training-mode .app-shell main { padding-bottom:calc(22px + env(safe-area-inset-bottom)); }\n  body.training-mode .topbar { display:none; }\n  body.training-mode .train-top { margin-top:14px; }\n\n  .question-row { min-width:0; }\n  .question-row > div:nth-child(2) { min-width:0; }\n  .question-row h4,.question-row p { overflow-wrap:anywhere; }\n}\n\n@media (max-width: 430px) {\n  .compact-checks { grid-template-columns:repeat(2,minmax(0,1fr)) !important; }\n  .compact-check { min-height:58px; padding:10px !important; font-size:12px !important; }\n  .modal { max-height:94dvh !important; }\n  .detail-grid .panel { min-width:0; }\n  .question-row { grid-template-columns:40px minmax(0,1fr) !important; }\n  .question-actions { grid-column:1/-1 !important; display:grid; grid-template-columns:1fr 1fr; }\n  .question-actions button { width:100%; }\n}\n

/* ArtiLearn 0.9.9 — clearer answer feedback */
.feedback-own{margin-top:8px;opacity:.8;font-size:.92em}
.feedback-solution{margin-top:10px;padding-top:10px;border-top:1px solid rgba(0,0,0,.08);font-size:1.04em;line-height:1.55}
.feedback-explanation{margin-top:8px;line-height:1.55}