:root{
  --bg:#f6f4ef; --paper:#fffdf8; --ink:#1c1b19; --muted:#6b675f;
  --line:#d9d3c7; --accent:#8a3b2e; --accent2:#1f5c4a;
  --hl-main:#ffe08a; --hl-conn:#bfe3ff; --hl-ref:#ffd0e0; --hl-evi:#c9f0c9;
  --shadow:0 1px 2px rgba(0,0,0,.06),0 8px 24px rgba(0,0,0,.06);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);
  font-family:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,"Times New Roman",serif;
  -webkit-font-smoothing:antialiased}
button{font:inherit;color:inherit;cursor:pointer}
.topbar{position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;
  gap:16px;padding:12px 22px;background:rgba(246,244,239,.94);border-bottom:1px solid var(--line);
  backdrop-filter:blur(8px)}
.brand{font-size:15px;letter-spacing:.14em;text-transform:uppercase;font-weight:700}
.brand span{color:var(--accent);font-weight:500}
.topmeta{font-size:13px;color:var(--muted);font-family:ui-sans-serif,system-ui,sans-serif}
#app{max-width:1180px;margin:0 auto;padding:26px 22px 80px}
.boot{padding:60px;text-align:center;color:var(--muted)}
h1,h2,h3{font-weight:600;line-height:1.2;margin:0 0 12px}
p{line-height:1.62}
.lede{font-size:15px;color:var(--muted);max-width:760px;margin:0 0 22px}
.card{background:var(--paper);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow)}
.start{padding:34px 36px}
.start h1{font-size:34px;letter-spacing:-.01em}
.pillrow{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0 24px}
.pill{font-family:ui-sans-serif,system-ui,sans-serif;font-size:12px;padding:6px 10px;border-radius:999px;
  background:#efeae0;border:1px solid var(--line);color:#4b463e}
.pill b{font-weight:700;color:var(--ink)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid var(--ink);
  background:var(--ink);color:#fff;padding:12px 20px;border-radius:10px;font-family:ui-sans-serif,system-ui,sans-serif;
  font-size:14px;font-weight:600;letter-spacing:.01em}
.btn:hover{opacity:.9}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn.ghost:hover{background:#f0ece3}
.btn.small{padding:8px 12px;font-size:12px;border-radius:8px}
.btn:disabled{opacity:.4;cursor:not-allowed}
.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.spacer{flex:1}

/* question layout */
.qhead{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:0 0 14px}
.qhead .qno{font-family:ui-sans-serif,system-ui,sans-serif;font-size:12px;letter-spacing:.08em;
  text-transform:uppercase;color:var(--muted)}
.badge{font-family:ui-sans-serif,system-ui,sans-serif;font-size:11px;font-weight:700;letter-spacing:.06em;
  text-transform:uppercase;padding:4px 8px;border-radius:6px;border:1px solid var(--line);background:#f2ede4}
.badge.A{background:#eef4ff;border-color:#c9d9f5}
.badge.B{background:#eef8f1;border-color:#c6e4cf}
.badge.C{background:#fdf3e7;border-color:#ecd2ad}
.timer{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;color:var(--muted);
  margin-left:auto;background:#f2ede4;border:1px solid var(--line);padding:5px 9px;border-radius:7px}
.workspace{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(360px,.95fr);gap:22px;align-items:start}
.pane{background:var(--paper);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);padding:24px 26px}
.passage{font-size:18px;line-height:1.72;letter-spacing:.005em}
.passage p{margin:0 0 14px}
.passage em,.passage i{font-style:italic}
.passage u{text-decoration-thickness:1.5px;text-underline-offset:3px}
.passage .blank{display:inline-block;min-width:84px;border-bottom:1.5px solid var(--ink);transform:translateY(-2px)}
.question .stem{font-size:17px;line-height:1.55;margin:0 0 16px;font-weight:600}
.options{display:flex;flex-direction:column;gap:10px;margin:0 0 18px}
.option{display:flex;gap:10px;text-align:left;width:100%;padding:12px 14px;border:1px solid var(--line);
  background:#fff;border-radius:10px;font-size:15.5px;line-height:1.5;transition:.12s}
.option:hover{border-color:#b9b1a3;background:#fdfaf4}
.option.sel{border-color:var(--ink);background:#f4efe5;box-shadow:inset 0 0 0 1px var(--ink)}
.option .letter{font-family:ui-sans-serif,system-ui,sans-serif;font-size:12px;font-weight:700;color:var(--muted);
  width:18px;flex:0 0 18px;padding-top:3px}
.option p{display:inline;margin:0}
.toolbar{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 12px;padding:10px;background:#f2ede4;border:1px dashed var(--line);
  border-radius:10px}
.tool{font-family:ui-sans-serif,system-ui,sans-serif;font-size:12px;padding:7px 10px;border:1px solid var(--line);
  background:#fff;border-radius:7px}
.tool:hover{border-color:var(--ink)}
.hint{font-family:ui-sans-serif,system-ui,sans-serif;font-size:12px;color:var(--muted);margin:0 0 10px}
.annlist{display:flex;flex-direction:column;gap:6px;margin:0 0 14px;font-family:ui-sans-serif,system-ui,sans-serif;font-size:12px}
.ann{display:flex;gap:8px;align-items:flex-start;padding:6px 8px;border-radius:6px;background:#f7f3ea;border:1px solid #e8e1d3}
.ann b{font-weight:700;white-space:nowrap}
.ann span{color:#444;overflow-wrap:anywhere}
.hl-main_clause{background:var(--hl-main)}
.hl-connective{background:var(--hl-conn)}
.hl-reference{background:var(--hl-ref)}
.hl-evidence{background:var(--hl-evi)}
.qfoot{display:flex;gap:10px;align-items:center;flex-wrap:wrap;border-top:1px solid var(--line);padding-top:14px}
.smallnote{font-family:ui-sans-serif,system-ui,sans-serif;font-size:12px;color:var(--muted)}

/* drills */
.drill{padding:26px 28px;max-width:820px;margin:0 auto}
.drill .dtype{font-family:ui-sans-serif,system-ui,sans-serif;font-size:11px;font-weight:700;letter-spacing:.1em;
  text-transform:uppercase;color:var(--accent);margin-bottom:10px}
.drill .sentence{font-size:20px;line-height:1.6;padding:16px 18px;background:#f7f3ea;border-left:3px solid var(--accent);border-radius:6px;margin:0 0 18px}
.drill .options .option{font-size:15px}
.feedback{margin-top:14px;padding:12px 14px;border-radius:8px;font-family:ui-sans-serif,system-ui,sans-serif;font-size:14px;line-height:1.5}
.feedback.ok{background:#e9f5ec;border:1px solid #bfe1c7}
.feedback.no{background:#fbeceb;border:1px solid #e7c0bc}

/* results */
.scorecard{display:flex;gap:22px;align-items:center;flex-wrap:wrap;padding:26px 28px;margin-bottom:18px}
.scorebig{font-size:46px;line-height:1;font-weight:700;letter-spacing:-.02em}
.scoresub{font-family:ui-sans-serif,system-ui,sans-serif;font-size:13px;color:var(--muted)}
.result{padding:20px 22px;margin:0 0 14px}
.result .rhead{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:10px}
.result .rhead .ok{color:var(--accent2);font-weight:700}
.result .rhead .no{color:var(--accent);font-weight:700}
.result .stem{font-size:15px;font-weight:600;margin:0 0 8px}
.result .answerline{font-family:ui-sans-serif,system-ui,sans-serif;font-size:13px;color:#3c3933;margin:0 0 8px}
.result .rationale{font-size:14.5px;line-height:1.6;color:#3c3933;margin:8px 0 0;white-space:pre-wrap}
.result .expert{font-family:ui-sans-serif,system-ui,sans-serif;font-size:12.5px;color:var(--muted);margin-top:8px}
.result .anns{margin:8px 0 0;font-family:ui-sans-serif,system-ui,sans-serif;font-size:12px;color:#4c483f}
@media (max-width: 900px){
  .workspace{grid-template-columns:1fr}
  .pane{padding:20px}
  .passage{font-size:17px}
  #app{padding:18px 14px 60px}
  .start{padding:24px}
  .start h1{font-size:28px}
}