@import url('https://fonts.googleapis.com/css2?family=Zilla+Slab:wght@500;600;700&family=IBM+Plex+Sans:wght@400;500;600;700&display=swap');

/* Black ink = the test itself (what a student sees on paper).
   Red ink = the teacher's own mark - type, points, the correct answer, the
   key. The two never mix: red never appears on anything that ends up in
   the student's copy of the PDF. */
:root{
  --paper:#f6f4ef;
  --ink:#221f1a;
  --ink-soft:#5b5648;
  --red:#b23b2e;
  --red-soft:#f3e4e1;
  --line:#dad5c7;
}
*{box-sizing:border-box}
body{margin:0;background:var(--paper);color:var(--ink);font:400 15px/1.6 'IBM Plex Sans',sans-serif}
main{width:min(760px,calc(100% - 40px));margin:auto;padding:32px 0 80px}

header{border-bottom:1px solid var(--line);padding-bottom:16px;margin-bottom:36px}
.brand{font:700 22px 'Zilla Slab',serif;color:var(--ink);text-decoration:none}

.workspace h1{font:600 21px 'Zilla Slab',serif;margin:0 0 22px}

.field{margin-bottom:18px}
.field label{display:block;font-size:13px;color:var(--ink-soft);margin-bottom:4px}
.field input[type=text],.field input[type=number]{
  width:100%;border:0;border-bottom:1px solid var(--line);background:transparent;
  padding:7px 2px;font:15px 'IBM Plex Sans';color:var(--ink);border-radius:0;
}
.field input:focus{outline:none;border-bottom:1.5px solid var(--ink)}
.field-narrow{width:150px}

.tabs{display:flex;gap:22px;border-bottom:1px solid var(--line);margin:30px 0 0}
.tab{appearance:none;border:0;background:none;padding:0 0 10px;
  font:500 14px 'IBM Plex Sans';color:var(--ink-soft);cursor:pointer;
  border-bottom:2px solid transparent;margin-bottom:-1px}
.tab.active{color:var(--ink);border-bottom-color:var(--ink)}

textarea#text{
  width:100%;min-height:224px;border:1px solid var(--line);outline:none;resize:vertical;
  padding:9px 12px 0;margin-top:16px;color:var(--ink);font:15px/28px 'IBM Plex Sans';
  background:var(--paper) repeating-linear-gradient(to bottom,
    transparent 0, transparent 27px, var(--line) 27px, var(--line) 28px);
}
.drop{border:1px dashed var(--line);min-height:224px;margin-top:16px;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:5px;cursor:pointer;color:var(--ink-soft);text-align:center}
.drop input{position:absolute;width:1px;height:1px;overflow:hidden}
.drop strong{font:600 15px 'IBM Plex Sans';color:var(--ink)}
.drop span{font-size:13px}

.run{display:flex;justify-content:space-between;align-items:center;
  margin-top:22px;padding-top:18px;border-top:1px solid var(--line);
  color:var(--ink-soft);font-size:13px}
.run button,.result-head button,.edit-actions .save-btn{
  background:var(--ink);color:var(--paper);border:0;padding:12px 22px;
  font:600 14px 'IBM Plex Sans';cursor:pointer}
.run button:hover,.result-head button:hover,.edit-actions .save-btn:hover{background:#000}
.run button:disabled{opacity:.5;cursor:wait}

#result{margin-top:60px}
.result-head{display:flex;justify-content:space-between;align-items:flex-end;
  border-bottom:2px solid var(--ink);padding-bottom:14px;margin-bottom:6px;
  flex-wrap:wrap;gap:14px}
.result-head h2{font:600 22px 'Zilla Slab',serif;margin:0 0 6px}
.stats{display:flex;gap:18px;color:var(--red);font:600 13px 'IBM Plex Sans'}
.stats strong{font-size:14px}

.error{margin:16px 0;padding:12px 15px;border-left:3px solid var(--red);
  background:var(--red-soft);color:var(--ink);font-size:13.5px}

.question{padding:24px 0;border-bottom:1px solid var(--line);transition:opacity .15s}
.question.excluded{opacity:.4}
.q-head{display:flex;justify-content:space-between;align-items:baseline;
  gap:12px;flex-wrap:wrap;margin-bottom:10px}
.use{display:inline-flex;align-items:center;gap:6px;font-size:13px;
  color:var(--ink-soft);cursor:pointer}
.tags{display:flex;gap:12px;color:var(--red);font:600 12px 'IBM Plex Sans'}
.edit-btn{border:0;background:none;color:var(--red);font:600 12px 'IBM Plex Sans';
  cursor:pointer;padding:0;text-decoration:underline;text-underline-offset:2px}
.question h3{font:600 17px/1.45 'Zilla Slab',serif;margin:0 0 14px;font-weight:600}
.question ol{margin:0 0 12px;padding-left:22px}
.question ol li{margin-bottom:4px}

.option{display:flex;align-items:flex-start;gap:11px;padding:5px 0}
.letter{flex:0 0 auto;width:22px;height:22px;border:1.5px solid var(--ink-soft);
  border-radius:50%;display:flex;align-items:center;justify-content:center;
  font:600 12px 'IBM Plex Sans';color:var(--ink)}
.option.correct .letter{border:2px solid var(--red);color:var(--red)}
.answer{color:var(--red);font:600 14px 'IBM Plex Sans';margin:14px 0 0}
.explanation{color:var(--ink-soft);font-size:13.5px;margin:8px 0 0}
.evidence{font:italic 13.5px/1.5 'IBM Plex Sans';color:var(--ink-soft);margin-top:8px}

.edit-question-text{width:100%;min-height:72px;border:1px solid var(--line);
  padding:9px;font:15px/1.5 'IBM Plex Sans';color:var(--ink);resize:vertical;
  background:var(--paper)}
.edit-options{margin-top:10px;display:flex;flex-direction:column;gap:8px}
.edit-option{display:flex;align-items:center;gap:9px}
.edit-option-text{flex:1;border:0;border-bottom:1px solid var(--line);
  background:transparent;padding:5px 2px;font:14px 'IBM Plex Sans';color:var(--ink)}
.edit-tasks{margin-top:10px;display:flex;flex-direction:column;gap:8px}
.edit-task-item{border:0;border-bottom:1px solid var(--line);background:transparent;
  padding:5px 2px;font:14px 'IBM Plex Sans';color:var(--ink)}
.edit-field{display:flex;flex-direction:column;gap:5px;margin-top:12px;
  font-size:13px;color:var(--ink-soft)}
.edit-field input{border:0;border-bottom:1px solid var(--line);background:transparent;
  padding:5px 2px;font:14px 'IBM Plex Sans';color:var(--ink)}
.note{color:var(--ink-soft);font-size:12px;margin:2px 0 4px}
.edit-actions{display:flex;gap:10px;margin-top:14px}
.edit-actions .cancel-btn{background:none;border:1px solid var(--line);
  color:var(--ink-soft);padding:11px 21px;font:600 13px 'IBM Plex Sans';cursor:pointer}

@media(max-width:600px){
  main{width:min(100% - 32px,760px)}
  .field-narrow{width:100%}
}