:root{
    --paper:#F6F4EE;
    --paper-line:#DCD7C9;
    --ink:#1C2B45;
    --ink-soft:#4C5A73;
    --gray:#8B8578;
    --correct:#2F6F4F;
    --correct-bg:#E7F0EA;
    --wrong:#B23A2E;
    --wrong-bg:#F5E7E4;
    --gold:#A8823C;
  }
  *{box-sizing:border-box;}
  body{
    margin:0;
    background:var(--paper);
    background-image:
      repeating-linear-gradient(var(--paper-line) 0 1px, transparent 1px 32px);
    font-family:-apple-system, 'Apple SD Gothic Neo', 'Malgun Gothic', sans-serif;
    color:var(--ink);
    padding-bottom:60px;
  }
  header{
    padding:24px 20px 16px;
    border-bottom:2px solid var(--ink);
    position:sticky;
    top:0;
    background:var(--paper);
    z-index:10;
    position:sticky;
  }
  .headtop{
    position:relative;
  }
  .resetcorner{
    margin-top:14px;
    font-family:'Consolas','Menlo',monospace;
    font-size:11px;
    padding:8px 14px;
    border:1.5px solid var(--wrong);
    color:var(--wrong);
    background:transparent;
    border-radius:2px;
    cursor:pointer;
    white-space:nowrap;
  }
  .resetcorner.confirming{
    background:var(--wrong);
    color:#fff;
  }
  .footerbtns{
    display:flex;
    justify-content:center;
    align-items:center;
    gap:8px;
    flex-wrap:wrap;
    margin-top:14px;
  }
  .footerbtns .reportbtn{margin-top:0;}
  .footerbtns .resetcorner{margin-top:0;}
  .eyebrow{
    font-family:'Consolas', 'Menlo', monospace;
    font-size:11px;
    letter-spacing:0.18em;
    color:var(--gold);
    text-transform:uppercase;
  }
  h1{
    font-family:'Georgia', serif;
    font-weight:900;
    font-size:19px;
    margin:2px 0 0;
    letter-spacing:-0.01em;
  }
  .titlerow{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:10px;
    flex-wrap:wrap;
  }
  .toptabs{
    display:flex;
    gap:0;
    border:1.5px solid var(--ink);
    border-radius:3px;
    overflow:hidden;
    flex-shrink:0;
  }
  .toptab{
    text-align:center;
    padding:5px 10px;
    font-size:11.5px;
    font-weight:700;
    background:transparent;
    color:var(--ink);
    border:none;
    cursor:pointer;
    border-right:1.5px solid var(--ink);
    white-space:nowrap;
  }
  .toptab:last-child{border-right:none;}
  .toptab.active{
    background:var(--ink);
    color:var(--paper);
  }
  .reportrow{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:10px;
    margin-top:12px;
    flex-wrap:wrap;
  }
  .reportbtn{
    font-family:'Consolas','Menlo',monospace;
    font-size:11.5px;
    padding:6px 11px;
    border:1.5px solid var(--gold);
    color:var(--gold);
    background:transparent;
    border-radius:2px;
    cursor:pointer;
  }
  .summary{
    font-family:'Consolas','Menlo',monospace;
    font-size:12px;
    color:var(--ink-soft);
  }
  main{
    max-width:640px;
    margin:0 auto;
    padding:10px 16px 0;
  }
  .modalbackdrop{
    display:none;
    position:fixed;
    inset:0;
    background:rgba(28,43,69,0.45);
    z-index:100;
  }
  .modalbackdrop.show{display:block;}
  .reportcard{
    display:none;
    position:fixed;
    top:50%;
    left:50%;
    transform:translate(-50%,-50%);
    width:min(560px, 92vw);
    max-height:80vh;
    overflow-y:auto;
    background:#fff;
    border:1.5px solid var(--gold);
    border-radius:4px;
    padding:20px;
    z-index:101;
    box-shadow:0 8px 0 var(--paper-line);
  }
  .reportcard.show{display:block;}
  .reportcardhead{
    display:flex;
    justify-content:space-between;
    align-items:center;
    gap:10px;
  }
  .modalclose{
    font-family:'Consolas','Menlo',monospace;
    font-size:11px;
    padding:6px 11px;
    border:1.5px solid var(--ink-soft);
    color:var(--ink-soft);
    background:transparent;
    border-radius:2px;
    cursor:pointer;
    flex-shrink:0;
  }
  .reportcard h2{font-family:'Georgia', serif;font-size:17px;margin:0 0 4px;}
  .reportcard .sub{font-family:'Consolas','Menlo',monospace;font-size:11px;color:var(--gray);margin-bottom:14px;}
  .catrow{margin-bottom:11px;}
  .catrow .catlabel{display:flex;justify-content:space-between;font-size:13px;margin-bottom:3px;}
  .catrow .catname{font-weight:700;}
  .catrow .catstat{font-family:'Consolas','Menlo',monospace;font-size:11.5px;color:var(--ink-soft);}
  .barbg{height:8px;background:var(--paper);border:1px solid var(--paper-line);border-radius:4px;overflow:hidden;}
  .barfill{height:100%;background:var(--correct);}
  .barfill.weak{background:var(--wrong);}
  .barfill.mid{background:var(--gold);}
  .noattempt{font-size:12px;color:var(--gray);font-style:italic;}
  .reportempty{font-size:13.5px;color:var(--ink-soft);line-height:1.6;}

  .pickgrid{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:10px;
    margin:18px 0;
  }
  .pickcard{
    border:1.5px solid var(--ink);
    background:#fff;
    border-radius:2px;
    padding:14px 12px;
    cursor:pointer;
    box-shadow:3px 3px 0 var(--paper-line);
    text-align:left;
  }
  .pickcard.weakpick{
    border-color:var(--wrong);
    background:var(--wrong-bg);
  }
  .pickcard .picktitle{
    font-weight:700;
    font-size:14.5px;
    margin-bottom:4px;
  }
  .pickcard .pickmeta{
    font-family:'Consolas','Menlo',monospace;
    font-size:11px;
    color:var(--ink-soft);
  }
  .pickcard.weakpick .pickmeta{color:var(--wrong);}
  .setgrid{
    display:grid;
    grid-template-columns:1fr;
    gap:10px;
    margin:18px 0;
  }
  .setcard{
    border:1.5px solid var(--ink);
    background:#fff;
    border-radius:2px;
    padding:14px 14px;
    cursor:pointer;
    box-shadow:3px 3px 0 var(--paper-line);
    display:flex;
    justify-content:space-between;
    align-items:center;
  }
  .setcard .settitle{font-weight:700;font-size:15px;}
  .setcard .setmeta{font-family:'Consolas','Menlo',monospace;font-size:11.5px;color:var(--ink-soft);}
  .tiergroup{
    background:#fff;
    border:1.5px solid var(--ink);
    border-radius:2px;
    margin:16px 0;
    padding:14px 16px 16px;
    box-shadow:3px 3px 0 var(--paper-line);
  }
  .tiergroup.t800{border-left:5px solid var(--correct);}
  .tiergroup.t900{border-left:5px solid var(--gold);}
  .tiergroup.t990{border-left:5px solid var(--wrong);}
  .tiertitle{font-family:'Georgia', serif;font-weight:900;font-size:16px;margin-bottom:2px;}
  .tierdesc{font-size:12px;color:var(--ink-soft);margin-bottom:10px;}
  .tiersetgrid{
    display:grid;
    grid-template-columns:1fr 1fr 1fr;
    gap:8px;
  }
  .tiersetcard{
    border:1.5px solid var(--ink-soft);
    background:var(--paper);
    border-radius:2px;
    padding:9px 4px 8px;
    text-align:center;
    cursor:pointer;
  }
  .tiersetcard:active{transform:scale(0.97);}
  .tiersetcard .tiersetlabel{
    font-family:'Consolas','Menlo',monospace;
    font-size:12px;
    font-weight:700;
  }
  .tiersetcard .tiersetmeta{
    font-family:'Consolas','Menlo',monospace;
    font-size:9.5px;
    color:var(--ink-soft);
    margin-top:3px;
  }
  .tiersetcard.done{
    border-color:var(--correct);
    background:var(--correct-bg);
  }
  .tiersetcard.done .tiersetmeta{color:var(--correct);font-weight:700;}
  .backbtn{
    font-family:'Consolas','Menlo',monospace;
    font-size:12px;
    padding:6px 12px;
    border:1.5px solid var(--ink-soft);
    background:transparent;
    color:var(--ink-soft);
    border-radius:2px;
    cursor:pointer;
    margin:14px 0 4px;
  }
  .sectiontitle{
    font-family:'Georgia', serif;
    font-size:17px;
    font-weight:900;
    margin:18px 0 2px;
  }
  .daytitle{
    font-family:'Georgia', serif;
    font-size:13px;
    font-weight:800;
    color:var(--ink-soft);
    margin:16px 0 6px;
    padding-bottom:4px;
    border-bottom:1.5px solid var(--paper-line);
  }
  .subtabs{
    display:flex;
    flex-wrap:wrap;
    gap:6px;
    margin:8px 0 12px;
  }
  .subtab{
    font-size:11.5px;
    padding:6px 10px;
    border:1.5px solid var(--paper-line);
    background:transparent;
    color:var(--ink-soft);
    border-radius:2px;
    cursor:pointer;
  }
  .subtab.active{
    background:var(--ink);
    color:var(--paper);
    border-color:var(--ink);
    font-weight:700;
  }
  .sectionsub{
    font-size:12.5px;
    color:var(--ink-soft);
    margin-bottom:4px;
  }

  .cheatgroup{
    background:#fff;
    border:1.5px solid var(--ink);
    border-radius:2px;
    margin:14px 0;
    box-shadow:3px 3px 0 var(--paper-line);
    overflow:hidden;
  }
  .cheatgroup summary{
    list-style:none;
    cursor:pointer;
    padding:14px 16px;
    display:flex;
    justify-content:space-between;
    align-items:center;
    font-weight:700;
    font-size:15px;
  }
  .cheatgroup summary::-webkit-details-marker{display:none;}
  .cheatgroup summary::after{
    content:'+';
    font-family:'Consolas','Menlo',monospace;
    color:var(--gold);
    font-size:18px;
    flex-shrink:0;
    margin-left:10px;
  }
  .cheatgroup[open] summary::after{content:'-';}
  .cheatgroup .cheatintro{
    padding:0 16px 10px;
    font-size:12.5px;
    color:var(--ink-soft);
    line-height:1.55;
  }
  .cheattable{
    border-top:1px solid var(--paper-line);
    padding:10px 16px 16px;
  }
  .cheatitem{
    padding:8px 0;
    border-bottom:1px dashed var(--paper-line);
    font-size:13.5px;
    line-height:1.55;
  }
  .cheatitem:last-child{border-bottom:none;}
  .cheatitem .term{
    display:block;
    font-family:'Consolas','Menlo',monospace;
    font-weight:700;
    color:var(--ink);
    margin-bottom:2px;
    word-break:break-word;
  }
  .cheatitem .meaning{display:block;color:var(--ink-soft);word-break:break-word;}
  .cheatitem .meaning b{color:var(--gold);font-weight:700;}
  .cheatitem .example{
    display:block;
    margin-top:4px;
    padding:6px 8px;
    background:var(--paper);
    border-left:2px solid var(--paper-line);
    font-size:12.5px;
    color:var(--ink-soft);
    font-style:italic;
  }
  .qcard{
    background:#fff;
    border:1.5px solid var(--ink);
    border-radius:2px;
    margin:22px 0;
    padding:20px 18px 18px;
    box-shadow:3px 3px 0 var(--paper-line);
  }
  .qhead{display:flex;justify-content:space-between;align-items:baseline;}
  .qnum{font-family:'Consolas','Menlo',monospace;font-weight:700;font-size:13px;color:var(--gold);letter-spacing:0.05em;}
  .qcat{font-family:'Consolas','Menlo',monospace;font-size:11px;color:var(--ink-soft);border:1px solid var(--paper-line);padding:2px 7px;border-radius:10px;}
  .qtext{font-size:16.5px;line-height:1.65;margin:8px 0 16px;}
  .blank{display:inline-block;min-width:52px;border-bottom:2px solid var(--ink);text-align:center;}
  .choices{display:grid;grid-template-columns:1fr 1fr;gap:8px;}
  .choice{
    display:flex;align-items:center;gap:8px;
    border:1.5px solid var(--ink-soft);background:var(--paper);
    padding:10px 10px;border-radius:2px;font-size:14.5px;
    cursor:pointer;text-align:left;transition:transform .06s ease;color:var(--ink);
  }
  .choice:active{transform:scale(0.98);}
  .choice .tag{
    font-family:'Consolas','Menlo',monospace;font-weight:700;font-size:12px;
    width:20px;height:20px;border-radius:50%;border:1.5px solid var(--ink-soft);
    display:flex;align-items:center;justify-content:center;flex-shrink:0;
  }
  .choice.correct{background:var(--correct-bg);border-color:var(--correct);color:var(--correct);}
  .choice.correct .tag{background:var(--correct);color:#fff;border-color:var(--correct);}
  .choice.wrong{background:var(--wrong-bg);border-color:var(--wrong);color:var(--wrong);}
  .choice.wrong .tag{background:var(--wrong);color:#fff;border-color:var(--wrong);}
  .choice[disabled]{cursor:default;}
  .choice.dim{opacity:0.45;}
  .explain{
    margin-top:14px;padding:12px 14px;border-left:3px solid var(--gold);
    background:#FBF9F3;font-size:13.5px;line-height:1.6;color:var(--ink-soft);display:none;
  }
  .explain.show{display:block;}
  .explain b{color:var(--ink);}
  .result-tag{font-family:'Consolas','Menlo',monospace;font-weight:700;font-size:12px;margin-top:12px;display:none;}
  .result-tag.show{display:block;}
  .result-tag.ok{color:var(--correct);}
  .result-tag.no{color:var(--wrong);}
  footer{
    max-width:640px;margin:0 auto;padding:24px 16px 40px;text-align:center;
    font-family:'Consolas','Menlo',monospace;font-size:12px;color:var(--gray);
  }