/* Chuck's Anatomy Tutor — styles */
  :root{
    --bg:#eaeef1;
    --surface:#ffffff;
    --surface-2:#f4f7f8;
    --ink:#182430;
    --muted:#5c6b78;
    --faint:#8595a1;
    --primary:#0d6b70;
    --primary-ink:#0a4f53;
    --primary-soft:#d8ebec;
    --accent:#c0472e;
    --correct:#1f7a4d;
    --correct-soft:#dcefe4;
    --incorrect:#b23b39;
    --incorrect-soft:#f6e0df;
    --line:#d6dee3;
    --radius:10px;
    --shadow:0 1px 2px rgba(24,36,48,.06), 0 8px 30px rgba(24,36,48,.08);
  }
  *{box-sizing:border-box}
  html,body{margin:0;padding:0}
  body{
    font-family:'IBM Plex Sans',system-ui,-apple-system,sans-serif;
    background:var(--bg);
    color:var(--ink);
    line-height:1.55;
    -webkit-font-smoothing:antialiased;
  }
  h1,h2,h3,.display{font-family:'Space Grotesk','IBM Plex Sans',sans-serif;letter-spacing:-.01em;}

  /* ---------- App shell ---------- */
  .topbar{
    position:sticky;top:0;z-index:20;
    background:var(--primary);color:#eafafa;
    display:flex;align-items:center;gap:16px;
    padding:12px 20px;
    box-shadow:0 1px 0 rgba(0,0,0,.12);
  }
  .brand{display:flex;flex-direction:column;line-height:1.1}
  .brand .t{font-family:'Space Grotesk';font-weight:700;font-size:1.05rem}
  .brand .s{font-size:.72rem;color:#a9dcdd;font-weight:400}
  .top-progress{margin-left:auto;display:flex;align-items:center;gap:12px;font-size:.82rem;color:#cfeeef}
  .ring{--p:0; width:38px;height:38px;border-radius:50%;
    background:conic-gradient(#fff calc(var(--p)*1%), rgba(255,255,255,.22) 0);
    display:grid;place-items:center;flex:none}
  .ring::after{content:attr(data-label);width:29px;height:29px;border-radius:50%;background:var(--primary);
    display:grid;place-items:center;font-size:.6rem;color:#fff;font-weight:600}
  .menu-btn{display:none;background:rgba(255,255,255,.14);border:none;color:#fff;border-radius:8px;
    width:38px;height:38px;font-size:1.1rem;cursor:pointer}

  .layout{display:grid;grid-template-columns:300px 1fr;gap:0;max-width:1200px;margin:0 auto;
    min-height:calc(100vh - 62px)}

  /* ---------- Sidebar ---------- */
  .sidebar{background:var(--surface);border-right:1px solid var(--line);padding:14px 10px 40px;
    position:sticky;top:62px;height:calc(100vh - 62px);overflow-y:auto}
  .side-head{font-size:.7rem;color:var(--faint);padding:6px 12px 10px;font-weight:600}
  .unit-btn{display:flex;gap:11px;align-items:flex-start;width:100%;text-align:left;border:none;background:none;
    padding:9px 12px;border-radius:8px;cursor:pointer;color:var(--ink);font:inherit;font-size:.86rem;margin-bottom:1px}
  .unit-btn:hover{background:var(--surface-2)}
  .unit-btn.active{background:var(--primary-soft);color:var(--primary-ink);font-weight:600}
  .unit-btn .num{flex:none;width:24px;height:24px;border-radius:6px;background:var(--surface-2);
    display:grid;place-items:center;font-size:.75rem;font-weight:600;color:var(--muted)}
  .unit-btn.active .num{background:var(--primary);color:#fff}
  .unit-btn .txt{flex:1;padding-top:1px}
  .unit-btn .badge{flex:none;font-size:.66rem;font-weight:600;padding:2px 7px;border-radius:20px;
    background:var(--surface-2);color:var(--faint);margin-top:2px}
  .unit-btn .badge.done{background:var(--correct-soft);color:var(--correct)}

  /* ---------- Main ---------- */
  .main{padding:26px clamp(18px,4vw,48px) 80px;min-width:0}
  .eyebrow{color:var(--primary);font-weight:600;font-size:.8rem;margin:0 0 4px}
  .u-title{font-size:clamp(1.5rem,3.2vw,2.1rem);font-weight:700;margin:0 0 6px;line-height:1.15}
  .u-sub{color:var(--muted);margin:0 0 22px;font-size:.95rem}

  .card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
    padding:22px 24px;margin-bottom:20px}
  .card h2{font-size:1.05rem;margin:0 0 14px;display:flex;align-items:center;gap:9px}
  .card h2 .dot{width:9px;height:9px;border-radius:2px;background:var(--primary);flex:none;transform:rotate(45deg)}

  .notes li{margin:0 0 10px}
  .notes strong{color:var(--primary-ink)}

  .terms{display:grid;gap:1px;background:var(--line);border-radius:8px;overflow:hidden;border:1px solid var(--line)}
  .term{background:var(--surface);display:grid;grid-template-columns:170px 1fr;gap:14px;padding:11px 14px}
  .term dt{font-weight:600;color:var(--primary-ink);font-size:.9rem}
  .term dd{margin:0;color:var(--ink);font-size:.9rem}

  .quiz-cta{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
  .quiz-cta .meta{color:var(--muted);font-size:.9rem}
  .btn{font:inherit;font-weight:600;border:none;border-radius:8px;cursor:pointer;padding:11px 20px;
    background:var(--primary);color:#fff;font-size:.92rem;transition:background .15s}
  .btn:hover{background:var(--primary-ink)}
  .btn:focus-visible{outline:3px solid #7fc4c6;outline-offset:2px}
  .btn.ghost{background:var(--surface-2);color:var(--primary-ink)}
  .btn.ghost:hover{background:var(--primary-soft)}
  .btn:disabled{opacity:.5;cursor:default}

  .last-score{font-size:.85rem;color:var(--muted);margin-top:8px}
  .last-score b{color:var(--correct)}

  /* ---------- Quiz modal ---------- */
  .overlay{position:fixed;inset:0;background:rgba(15,25,33,.55);backdrop-filter:blur(2px);
    display:none;align-items:center;justify-content:center;z-index:50;padding:16px}
  .overlay.open{display:flex}
  .modal{background:var(--surface);border-radius:14px;box-shadow:var(--shadow);width:min(640px,100%);
    max-height:92vh;overflow:hidden;display:flex;flex-direction:column;
    animation:pop .18s ease}
  @keyframes pop{from{opacity:0;transform:scale(.96) translateY(8px)}to{opacity:1;transform:none}}
  .m-head{padding:16px 22px;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:14px}
  .m-head .qcount{font-size:.8rem;color:var(--muted);font-weight:600}
  .m-head .close{margin-left:auto;background:none;border:none;font-size:1.3rem;color:var(--faint);cursor:pointer;line-height:1}
  .m-bar{height:4px;background:var(--surface-2);border-radius:4px;overflow:hidden;flex:1;max-width:230px}
  .m-bar i{display:block;height:100%;background:var(--primary);width:0;transition:width .25s}
  .m-body{padding:24px 22px;overflow-y:auto}
  .q-text{font-size:1.08rem;font-weight:600;font-family:'Space Grotesk';margin:0 0 18px;line-height:1.4}
  .opts{display:grid;gap:10px}
  .opt{display:flex;gap:12px;align-items:flex-start;text-align:left;width:100%;font:inherit;font-size:.95rem;
    background:var(--surface);border:1.5px solid var(--line);border-radius:9px;padding:13px 15px;cursor:pointer;
    transition:border-color .12s,background .12s}
  .opt:hover:not(:disabled){border-color:var(--primary);background:var(--surface-2)}
  .opt .key{flex:none;width:24px;height:24px;border-radius:6px;background:var(--surface-2);color:var(--muted);
    display:grid;place-items:center;font-weight:600;font-size:.8rem}
  .opt:disabled{cursor:default}
  .opt.correct{border-color:var(--correct);background:var(--correct-soft)}
  .opt.correct .key{background:var(--correct);color:#fff}
  .opt.wrong{border-color:var(--incorrect);background:var(--incorrect-soft)}
  .opt.wrong .key{background:var(--incorrect);color:#fff}
  .opt.dim{opacity:.6}
  .explain{margin-top:16px;border-left:3px solid var(--primary);background:var(--surface-2);
    padding:12px 15px;border-radius:0 8px 8px 0;font-size:.9rem;display:none}
  .explain.show{display:block}
  .explain b{color:var(--primary-ink)}
  .explain.bad{border-color:var(--incorrect)} .explain.bad b{color:var(--incorrect)}
  .explain.good{border-color:var(--correct)} .explain.good b{color:var(--correct)}
  .m-foot{padding:14px 22px;border-top:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;gap:12px}
  .m-foot .running{font-size:.82rem;color:var(--muted)}

  /* results */
  .result{text-align:center;padding:14px 4px}
  .result .big{font-family:'Space Grotesk';font-size:3rem;font-weight:700;color:var(--primary);margin:6px 0}
  .result .grade{font-size:1.1rem;font-weight:600;margin-bottom:6px}
  .result p{color:var(--muted);margin:0 0 20px}
  .result .actions{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}

  .footer{max-width:1200px;margin:0 auto;padding:18px 24px 40px;color:var(--faint);font-size:.78rem}

  /* ---------- Header buttons ---------- */
  .hbtn{background:rgba(255,255,255,.14);border:none;color:#fff;border-radius:8px;height:38px;padding:0 14px;
    font:inherit;font-weight:600;font-size:.85rem;cursor:pointer;display:flex;align-items:center;gap:7px;flex:none}
  .hbtn:hover{background:rgba(255,255,255,.24)}
  .hbtn.icon{width:38px;padding:0;justify-content:center;font-size:1.05rem}
  .hbtn .pulse{width:8px;height:8px;border-radius:50%;background:#ffd166}
  .hbtn .pulse.on{background:#7ee8a2}

  /* ---------- Tutor drawer ---------- */
  .drawer{position:fixed;top:0;right:0;height:100vh;width:min(440px,100vw);background:var(--surface);
    box-shadow:-8px 0 30px rgba(24,36,48,.15);z-index:60;transform:translateX(105%);transition:transform .22s;
    display:flex;flex-direction:column;border-left:1px solid var(--line)}
  .drawer.open{transform:none}
  .d-head{padding:14px 18px;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:12px;background:var(--primary);color:#fff}
  .d-head .t{font-family:'Space Grotesk';font-weight:700;font-size:1rem}
  .d-head .s{font-size:.72rem;color:#a9dcdd}
  .d-head .close{margin-left:auto;background:none;border:none;color:#fff;font-size:1.4rem;cursor:pointer;line-height:1}
  .chat{flex:1;overflow-y:auto;padding:16px 16px 8px;display:flex;flex-direction:column;gap:12px;background:var(--surface-2)}
  .msg{max-width:88%;padding:11px 14px;border-radius:12px;font-size:.92rem;line-height:1.5;white-space:pre-wrap;word-wrap:break-word}
  .msg.user{align-self:flex-end;background:var(--primary);color:#fff;border-bottom-right-radius:4px}
  .msg.bot{align-self:flex-start;background:var(--surface);border:1px solid var(--line);border-bottom-left-radius:4px}
  .msg.sys{align-self:center;background:none;color:var(--faint);font-size:.8rem;text-align:center;max-width:100%}
  .msg.err{align-self:stretch;background:var(--incorrect-soft);color:var(--incorrect);border:1px solid #e6b3b1;font-size:.85rem;max-width:100%}
  .typing{align-self:flex-start;color:var(--faint);font-size:.85rem;padding:6px 14px}
  .quick{display:flex;gap:6px;flex-wrap:wrap;padding:10px 16px;border-top:1px solid var(--line);background:var(--surface)}
  .quick button{font:inherit;font-size:.78rem;font-weight:600;color:var(--primary-ink);background:var(--primary-soft);
    border:none;border-radius:20px;padding:6px 12px;cursor:pointer}
  .quick button:hover{background:#c3e0e1}
  .composer{display:flex;gap:8px;padding:12px 16px 16px;background:var(--surface);border-top:1px solid var(--line)}
  .composer textarea{flex:1;font:inherit;font-size:.92rem;padding:10px 12px;border:1.5px solid var(--line);border-radius:9px;
    resize:none;min-height:44px;max-height:140px;line-height:1.4}
  .composer textarea:focus{outline:none;border-color:var(--primary)}
  .composer .btn{align-self:flex-end;padding:11px 16px}

  /* ---------- Settings modal ---------- */
  .settings .m-body{padding:22px}
  .field{margin-bottom:16px}
  .field label{display:block;font-weight:600;font-size:.85rem;margin-bottom:6px;color:var(--ink)}
  .field input,.field select{width:100%;font:inherit;font-size:.92rem;padding:10px 12px;border:1.5px solid var(--line);border-radius:8px;background:var(--surface)}
  .field input:focus,.field select:focus{outline:none;border-color:var(--primary)}
  .field .help{font-size:.78rem;color:var(--muted);margin-top:6px;line-height:1.45}
  .field .help a{color:var(--primary)}
  .status{font-size:.85rem;padding:10px 12px;border-radius:8px;margin-bottom:14px;background:var(--surface-2);color:var(--muted)}
  .status.ok{background:var(--correct-soft);color:var(--correct)}
  .status.warn{background:#fff3d6;color:#8a5a00}
  .keyrow{display:flex;gap:8px}
  .keyrow input{flex:1}
  .keyrow .btn{padding:0 14px}

  @media (max-width:860px){
    .layout{grid-template-columns:1fr}
    .menu-btn{display:block}
    .top-progress span{display:none}
    .brand .s{display:none}
    .sidebar{position:fixed;left:0;top:62px;width:300px;max-width:85vw;z-index:30;
      transform:translateX(-105%);transition:transform .22s;box-shadow:var(--shadow)}
    .sidebar.open{transform:none}
    .term{grid-template-columns:1fr;gap:2px}
    .scrim{position:fixed;inset:62px 0 0 0;background:rgba(15,25,33,.4);z-index:25;display:none}
    .scrim.open{display:block}
  }
  @media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* ============================================================
   Additions: home dashboard, review, exam, flashcards, diagrams
============================================================ */
.side-section{font-size:.7rem;color:var(--faint);padding:14px 12px 8px;font-weight:600}
.unit-btn .badge.t2{background:#efe6f7;color:#6b3fa0}
.unit-btn .badge.due{background:#fff3d6;color:#8a5a00}

/* home */
.home-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:14px;margin-bottom:20px}
.tile{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;display:flex;flex-direction:column;gap:8px}
.tile h3{margin:0;font-size:1rem}
.tile .big{font-family:'Space Grotesk';font-size:2.2rem;font-weight:700;line-height:1;color:var(--primary)}
.tile .big.warn{color:#b8730a}
.tile p{margin:0;color:var(--muted);font-size:.86rem;line-height:1.45}
.tile .btn{align-self:flex-start;margin-top:auto}
.tile.accent{background:var(--primary);border-color:var(--primary);color:#eafafa}
.tile.accent h3,.tile.accent .big{color:#fff}
.tile.accent p{color:#cfeeef}
.tile.accent .btn{background:#fff;color:var(--primary-ink)}
.tile.accent .btn:hover{background:#e6f4f5}

.exam-opts{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:8px 0 14px}
.seg{display:inline-flex;border:1.5px solid var(--line);border-radius:8px;overflow:hidden}
.seg button{font:inherit;font-size:.85rem;font-weight:600;padding:8px 14px;border:none;background:var(--surface);color:var(--muted);cursor:pointer}
.seg button.on{background:var(--primary);color:#fff}
.seg-label{font-size:.82rem;color:var(--muted);margin-right:4px}

/* weak spots / calibration */
.weak-list{list-style:none;margin:0;padding:0}
.weak-list li{padding:10px 0;border-bottom:1px solid var(--line);font-size:.9rem;display:flex;gap:12px;align-items:flex-start}
.weak-list li:last-child{border-bottom:none}
.weak-list .u{flex:none;font-size:.72rem;font-weight:600;color:var(--primary-ink);background:var(--primary-soft);border-radius:6px;padding:2px 7px;margin-top:2px}
.weak-list .why{color:var(--incorrect);font-size:.78rem;font-weight:600;margin-left:auto;white-space:nowrap}
.calib{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.calib div{background:var(--surface-2);border-radius:8px;padding:12px}
.calib b{display:block;font-family:'Space Grotesk';font-size:1.4rem;color:var(--primary)}
.calib span{font-size:.78rem;color:var(--muted)}
.unit-bars{display:grid;gap:8px}
.ubar{display:grid;grid-template-columns:28px 1fr 46px;gap:10px;align-items:center;font-size:.84rem}
.ubar .track{height:8px;background:var(--surface-2);border-radius:4px;overflow:hidden}
.ubar .track i{display:block;height:100%;background:var(--primary)}
.ubar .track i.pass{background:var(--correct)}
.ubar .n{color:var(--faint);font-weight:600}
.ubar .pct{text-align:right;color:var(--muted)}
.empty{color:var(--muted);font-size:.9rem;padding:6px 0}

/* confidence strip */
.conf{display:none;margin-top:14px;padding:12px 14px;background:var(--surface-2);border-radius:9px;align-items:center;gap:10px;flex-wrap:wrap}
.conf.show{display:flex}
.conf .lbl{font-size:.85rem;font-weight:600;color:var(--ink);margin-right:auto}
.conf button{font:inherit;font-size:.82rem;font-weight:600;padding:8px 14px;border-radius:20px;border:1.5px solid var(--line);background:var(--surface);cursor:pointer;color:var(--ink)}
.conf button:hover{border-color:var(--primary);background:var(--primary-soft)}
.opt.picked{border-color:var(--primary);background:var(--primary-soft)}
.opt.picked .key{background:var(--primary);color:#fff}
.tag{display:inline-block;font-size:.68rem;font-weight:600;padding:2px 7px;border-radius:20px;margin-left:8px;vertical-align:middle}
.tag.t2{background:#efe6f7;color:#6b3fa0}
.tag.dg{background:#e0f0e6;color:#1f6a44}
.tag.rev{background:#fff3d6;color:#8a5a00}
.timer{font-size:.85rem;font-weight:600;color:var(--muted);font-variant-numeric:tabular-nums}
.timer.low{color:var(--incorrect)}

/* result breakdown */
.breakdown{text-align:left;margin:14px auto 0;max-width:420px}
.breakdown .ubar{grid-template-columns:1fr 60px}
.result .cal{font-size:.85rem;color:var(--muted);margin:6px 0 14px}

/* diagram */
.dg-wrap{background:var(--surface-2);border-radius:10px;padding:10px;margin:0 0 16px}
.dg-wrap svg{width:100%;height:auto;display:block;max-height:420px}
.part *{transition:fill .15s,stroke .15s}
.part.hl *{stroke:#c0472e !important;stroke-width:4px !important}
.part.hl:not([data-hollow]) *{fill:#f6b9a6 !important}
.part.hl [fill="transparent"]{fill:rgba(192,71,46,.28) !important}
.dg-title{font-size:.8rem;color:var(--muted);text-align:center;margin:4px 0 0}

/* flashcards */
.fc-stage{perspective:1200px;margin:6px 0 16px}
.fc{position:relative;width:100%;min-height:220px;cursor:pointer;transform-style:preserve-3d;transition:transform .35s}
.fc.flipped{transform:rotateY(180deg)}
.fc .face{position:absolute;inset:0;border-radius:14px;padding:26px 28px;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;backface-visibility:hidden}
.fc .front{background:var(--primary);color:#fff}
.fc .front .term{font-family:'Space Grotesk';font-size:1.6rem;font-weight:700;line-height:1.2}
.fc .front .hint{font-size:.78rem;color:#a9dcdd;margin-top:14px}
.fc .back{background:var(--surface);border:1.5px solid var(--line);transform:rotateY(180deg);font-size:1.05rem;line-height:1.5}
.fc .back .term{font-weight:600;color:var(--primary-ink);font-size:.85rem;margin-bottom:10px}
.fc-actions{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
.fc-actions .btn.again{background:var(--incorrect-soft);color:var(--incorrect)}
.fc-actions .btn.again:hover{background:#efd0cf}
.fc-actions .btn.got{background:var(--correct-soft);color:var(--correct)}
.fc-actions .btn.got:hover{background:#c8e6d4}
.fc-count{text-align:center;font-size:.82rem;color:var(--muted);margin-bottom:8px}
.modal.wide{width:min(720px,100%)}

/* tutor extras */
.paste-box textarea{width:100%;font:inherit;font-size:.88rem;padding:10px 12px;border:1.5px solid var(--line);border-radius:8px;min-height:120px;resize:vertical}
.paste-box textarea:focus{outline:none;border-color:var(--primary)}
.paste-meta{font-size:.78rem;color:var(--muted);margin-top:6px}
.nav-btn{display:flex;gap:11px;align-items:center;width:100%;text-align:left;border:none;background:none;padding:9px 12px;border-radius:8px;cursor:pointer;color:var(--ink);font:inherit;font-size:.86rem;font-weight:600}
.nav-btn:hover{background:var(--surface-2)}
.nav-btn.active{background:var(--primary-soft);color:var(--primary-ink)}
.nav-btn .ic{width:24px;height:24px;border-radius:6px;background:var(--surface-2);display:grid;place-items:center;font-size:.85rem}
.nav-btn.active .ic{background:var(--primary);color:#fff}
.nav-btn .cnt{margin-left:auto;font-size:.68rem;font-weight:700;background:#fff3d6;color:#8a5a00;border-radius:20px;padding:2px 7px}
.unlock-note{font-size:.85rem;color:var(--muted);background:var(--surface-2);border-radius:8px;padding:10px 12px;margin-top:10px}
@media (max-width:640px){.calib{grid-template-columns:1fr 1fr}}

/* ============================================================
   Additions (Oct 2026): Patton map, class card, AI practice, tutor upgrades, guide
============================================================ */
.unit-btn .num.ch{width:auto;min-width:30px;padding:0 6px;font-size:.66rem;white-space:nowrap}
.unit-btn .badge.now{background:#fff3d6;color:#8a5a00}
.unit-btn .badge + .badge{margin-left:4px}
.ubar{grid-template-columns:48px 1fr 46px}
.btn.small{padding:7px 13px;font-size:.82rem}
.actions-row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.tag.book{background:var(--primary-soft);color:var(--primary-ink)}
.tag.ai{background:#e6ecfb;color:#3450a0}

/* In class now */
.class-now{display:flex;gap:16px;align-items:center;margin:0 0 14px}
.class-now .ch-big{font-family:'Space Grotesk';font-weight:700;font-size:1.6rem;color:#fff;background:var(--primary);border-radius:10px;padding:10px 14px;flex:none}
.class-now .ch-info{display:flex;flex-direction:column}
.class-now .ch-info b{font-size:1.05rem}
.class-now .ch-info span{font-size:.85rem;color:var(--muted)}
.test-row{margin-top:14px;padding:12px 14px;border-radius:9px;background:var(--surface-2);display:flex;flex-direction:column;gap:10px}
.test-row.soon{background:#fff3d6}
.test-row.soon b{color:#8a5a00}

/* chapters on a unit page */
.ch-list{list-style:none;margin:0;padding:0}
.ch-list li{display:flex;gap:12px;align-items:flex-start;padding:10px 0;border-bottom:1px solid var(--line)}
.ch-list li:last-child{border-bottom:none}
.ch-list .chn{flex:none;font-weight:700;font-size:.78rem;color:var(--primary-ink);background:var(--primary-soft);border-radius:6px;padding:3px 8px;margin-top:2px;white-space:nowrap}
.ch-list .cht{flex:1;display:flex;flex-direction:column;font-size:.92rem}
.ch-list .cht small{color:var(--muted);font-size:.8rem;margin-top:2px}
.ch-list .chb{flex:none;display:flex;gap:6px}
@media (max-width:640px){ .ch-list li{flex-wrap:wrap} .ch-list .chb{width:100%;padding-left:52px} }

/* quiz extras */
.conf kbd,.guide-body kbd{font:600 .68rem 'IBM Plex Sans',sans-serif;background:var(--surface-2);border:1px solid var(--line);border-radius:4px;padding:0 4px;color:var(--muted);margin-left:3px}
.ex-actions{margin-top:10px}
.fc-ex{font-size:.85rem;color:var(--muted);margin-top:10px}

/* study dialog (AI practice / chapter picker / class setup) */
.study-ov .m-body{max-height:75vh}
.st-wait{text-align:center;padding:26px 10px}
.st-wait .muted,.muted{color:var(--muted);font-size:.88rem}
.spinner{width:34px;height:34px;border-radius:50%;border:3px solid var(--primary-soft);border-top-color:var(--primary);margin:0 auto 14px;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.st-opts{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:14px}
.st-unit{font-size:.72rem;font-weight:700;color:var(--faint);margin:14px 0 6px;text-transform:uppercase;letter-spacing:.03em}
.st-chs{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:6px}
.st-ch{display:flex;gap:9px;align-items:center;text-align:left;font:inherit;font-size:.84rem;background:var(--surface);border:1.5px solid var(--line);border-radius:8px;padding:8px 10px;cursor:pointer;color:var(--ink)}
.st-ch:hover{border-color:var(--primary);background:var(--surface-2)}
.st-ch b{flex:none;width:26px;height:26px;border-radius:6px;background:var(--surface-2);display:grid;place-items:center;font-size:.78rem;color:var(--primary-ink)}
.st-ch.cur{border-color:var(--primary)} .st-ch.cur b{background:var(--primary);color:#fff}
.field input.bad{border-color:var(--incorrect)}

/* tutor drawer extras */
.msg.rich{white-space:normal}
.msg.rich p{margin:0 0 8px} .msg.rich p:last-child{margin-bottom:0}
.msg.rich ul,.msg.rich ol{margin:4px 0 8px;padding-left:20px} .msg.rich li{margin:2px 0}
.msg.rich code{background:var(--surface-2);border-radius:4px;padding:0 4px;font-size:.85em}
.msg .chat-img{display:block;max-width:100%;max-height:220px;border-radius:8px;margin-bottom:8px}
.img-preview{display:flex;gap:10px;align-items:center;padding:8px 16px;background:var(--surface);border-top:1px solid var(--line);font-size:.8rem;color:var(--muted);position:relative}
.img-preview[hidden]{display:none}
.img-preview img{height:54px;width:auto;border-radius:6px;border:1px solid var(--line)}
.img-preview .x{background:var(--incorrect-soft);color:var(--incorrect);border:none;border-radius:50%;width:22px;height:22px;cursor:pointer;font-size:.9rem;line-height:1;flex:none}
.composer .photo-btn{align-self:flex-end;padding:11px 12px;font-size:1rem}

/* how-to guide */
.guide-body .g-title{font-size:1.2rem;margin:0 0 12px}
.guide-body p,.guide-body li{font-size:.94rem}
.guide-body ol,.guide-body ul{padding-left:20px}
.guide-body li{margin-bottom:6px}
.hbtn.nudge{background:#ffd166;color:#3a2a00;animation:nudge 1.6s ease-in-out 3}
@keyframes nudge{50%{transform:scale(1.07)}}