:root {
  --bg: #f6f4ef; --card: #ffffff; --ink: #1d2433; --muted: #667085; --line: #e3e0d8;
  --accent: #3b5bdb; --accent-soft: #e7ecff; --good: #2b8a3e; --good-soft: #e6f4ea;
  --bad: #c92a2a; --bad-soft: #fdecec; --warn: #b7791f; --warn-soft: #fdf3e1;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161c; --card: #1d2029; --ink: #e8e9ee; --muted: #9aa1b2; --line: #2e3240;
    --accent: #7c95ff; --accent-soft: #252c4a; --good: #5ec27a; --good-soft: #1c3324;
    --bad: #ff7b7b; --bad-soft: #3a1f22; --warn: #f0b45a; --warn-soft: #3a2f1c;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.55 var(--sans); }
button { font: inherit; }
a { color: var(--accent); }
.wrap { max-width: 880px; margin: 0 auto; padding: 24px 16px 80px; }
h1 { font-size: 2rem; margin: .2em 0; letter-spacing: -.01em; }
h2 { font-size: 1.25rem; margin: 1.4em 0 .5em; }
.muted { color: var(--muted); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 20px; }
.btn { background: var(--accent); color: #fff; border: 0; border-radius: 10px; padding: 10px 18px; cursor: pointer; font-weight: 600; }
.btn:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; color: var(--accent); border: 1px solid var(--line); }
.btn:disabled { opacity: .4; cursor: default; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.spacer { flex: 1; }

/* home */
.hero { margin: 20px 0 28px; }
.tests { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.test-card { display: flex; flex-direction: column; gap: 8px; }
.test-card .big { font-size: 2.4rem; font-weight: 800; color: var(--accent); line-height: 1; }
.test-card .btn { margin-top: auto; align-self: flex-start; }
.hist { width: 100%; border-collapse: collapse; font-size: .95rem; }
.hist td, .hist th { padding: 8px 6px; border-bottom: 1px solid var(--line); text-align: left; }
.linkish { background: none; border: 0; color: var(--accent); cursor: pointer; padding: 0; text-decoration: underline; }

/* test chrome */
.topbar { position: sticky; top: 0; z-index: 5; background: var(--card); border-bottom: 1px solid var(--line); }
.topbar .inner { max-width: 1200px; margin: 0 auto; padding: 10px 16px; display: flex; gap: 12px; align-items: center; }
.timer { font-variant-numeric: tabular-nums; font-weight: 700; font-size: 1.1rem; padding: 4px 10px; border-radius: 8px; }
.timer.low { background: var(--bad-soft); color: var(--bad); }
.timer.hidden-t { color: transparent; text-shadow: 0 0 8px var(--muted); }
.qwrap { max-width: 1200px; margin: 0 auto; padding: 20px 16px 120px; display: grid; gap: 24px; grid-template-columns: 1fr; }
.qwrap.split { grid-template-columns: 1fr 1fr; }
@media (max-width: 860px) { .qwrap.split { grid-template-columns: 1fr; } }
.passage { font-family: var(--serif); font-size: 1.08rem; line-height: 1.7; }
.passage p:first-child { margin-top: 0; }
.qhead { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.qnum { background: var(--ink); color: var(--card); font-weight: 700; border-radius: 6px; padding: 2px 10px; }
.flag { background: none; border: 1px solid var(--line); border-radius: 8px; padding: 4px 10px; cursor: pointer; color: var(--muted); }
.flag.on { color: var(--warn); border-color: var(--warn); background: var(--warn-soft); }
.prompt { font-weight: 600; margin-bottom: 14px; }
.math-prompt { font-family: var(--serif); font-size: 1.12rem; font-weight: 400; }
.choices { display: grid; gap: 10px; }
.choice { display: flex; gap: 12px; align-items: flex-start; text-align: left; background: var(--card); color: var(--ink);
  border: 1.5px solid var(--line); border-radius: 12px; padding: 12px 14px; cursor: pointer; width: 100%; }
.choice:hover { border-color: var(--accent); }
.choice .letter { flex: none; width: 28px; height: 28px; border-radius: 50%; border: 1.5px solid var(--muted);
  display: grid; place-items: center; font-weight: 700; font-size: .9rem; }
.choice.sel { border-color: var(--accent); background: var(--accent-soft); }
.choice.sel .letter { background: var(--accent); border-color: var(--accent); color: #fff; }
.choice.struck .ctext { text-decoration: line-through; opacity: .45; }
.choice .x { margin-left: auto; flex: none; border: 0; background: none; color: var(--muted); cursor: pointer; font-size: .85rem; padding: 2px 6px; }
.spr { font-size: 1.3rem; padding: 10px 14px; border: 1.5px solid var(--line); border-radius: 10px; width: 200px; background: var(--card); color: var(--ink); }
.spr:focus { outline: none; border-color: var(--accent); }
table.data { border-collapse: collapse; margin: 6px 0 14px; font-family: var(--sans); font-size: .95rem; }
table.data caption { font-weight: 600; text-align: left; padding-bottom: 6px; }
table.data th, table.data td { border: 1px solid var(--line); padding: 6px 12px; text-align: center; }
.bottombar { position: fixed; bottom: 0; left: 0; right: 0; background: var(--card); border-top: 1px solid var(--line); z-index: 5; }
.bottombar .inner { max-width: 1200px; margin: 0 auto; padding: 10px 16px; display: flex; gap: 10px; align-items: center; }
.palette { display: grid; grid-template-columns: repeat(auto-fill, minmax(44px, 1fr)); gap: 8px; margin: 14px 0; }
.palette button { aspect-ratio: 1; border-radius: 8px; border: 1.5px dashed var(--muted); background: var(--card); color: var(--ink); cursor: pointer; font-weight: 600; position: relative; }
.palette button.ans { border: 1.5px solid var(--accent); background: var(--accent-soft); }
.palette button.cur { outline: 2px solid var(--ink); outline-offset: 2px; }
.palette button.flagged::after { content: "⚑"; position: absolute; top: -8px; right: -4px; color: var(--warn); font-size: .9rem; }
dialog { border: 1px solid var(--line); border-radius: 14px; background: var(--card); color: var(--ink); max-width: 560px; width: calc(100% - 32px); }
dialog::backdrop { background: rgba(0,0,0,.4); }
.ref-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; font-size: .95rem; }
.ref-grid div { border: 1px solid var(--line); border-radius: 8px; padding: 8px; }

/* results */
.scores { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; }
.score .n { font-size: 2.2rem; font-weight: 800; line-height: 1.1; }
.score .lbl { color: var(--muted); font-size: .9rem; }
.bar { height: 10px; border-radius: 99px; background: var(--line); overflow: hidden; }
.bar > i { display: block; height: 100%; border-radius: 99px; }
.dom { display: grid; grid-template-columns: 1fr 110px; gap: 4px 14px; align-items: center; margin: 10px 0; }
.dom .pct { text-align: right; font-variant-numeric: tabular-nums; font-weight: 600; }
.focus { border-left: 4px solid var(--bad); padding: 10px 14px; background: var(--bad-soft); border-radius: 0 10px 10px 0; margin: 10px 0; }
.focus.ok { border-color: var(--good); background: var(--good-soft); }
.skills { width: 100%; border-collapse: collapse; font-size: .95rem; }
.skills td, .skills th { padding: 8px 6px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.skills td.num { text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; }
.pill { display: inline-block; padding: 1px 8px; border-radius: 99px; font-size: .8rem; font-weight: 600; }
.pill.good { background: var(--good-soft); color: var(--good); }
.pill.bad { background: var(--bad-soft); color: var(--bad); }
.pill.mid { background: var(--warn-soft); color: var(--warn); }
.rev { margin: 14px 0; }
.rev .verdict { font-weight: 700; }
.rev .verdict.good { color: var(--good); }
.rev .verdict.bad { color: var(--bad); }
.rev .explain { background: var(--bg); border-radius: 10px; padding: 10px 14px; margin-top: 8px; }
.rev .passage { font-size: 1rem; }
details summary { cursor: pointer; }
@media print { .topbar, .bottombar, .noprint { display: none !important; } body { background: #fff; } }