/* Một cột để đọc và trả lời từng câu; màu lấy từ men ngọc, đồng và đất phù sa. */
:root {
  --nen: #eff3ec;
  --mat: #fbfcf8;
  --chu: #1f2a25;
  --chu-phu: #55635b;
  --vien: #cbd6cb;
  --ngoc: #2f6f60;
  --ngoc-nhat: #dcebe3;
  --tren-ngoc: #f6fbf8;
  --dong: #8a5a1f;
  --dong-nhat: #f3e6d0;
  --loi: #a3362a;
  --so-chu: 'Spectral', 'Noto Serif', Georgia, serif;
  --than-chu: 'Be Vietnam Pro', 'Segoe UI', system-ui, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --nen: #141b18; --mat: #1c2521; --chu: #e6ece7; --chu-phu: #a3b1a8; --vien: #34423b;
    --ngoc: #6fbba7; --ngoc-nhat: #20382f; --tren-ngoc: #0f1a16;
    --dong: #d7a860; --dong-nhat: #3a2d19; --loi: #ee8a7d; color-scheme: dark;
  }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; background: var(--nen); color: var(--chu); font: 400 15px/1.6 var(--than-chu); }
.khung {
  max-width: 760px; margin: 0 auto; display: grid; gap: 28px; padding-block: 36px 24px;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
h1, h2 { font-family: var(--so-chu); font-weight: 600; text-wrap: balance; margin: 0; }
h1 { font-size: clamp(28px, 6vw, 38px); line-height: 1.15; }
h2 { font-size: 22px; line-height: 1.3; }
p { margin: 0; }
.dau { display: grid; gap: 10px; }
.vong { font-size: 13px; font-weight: 600; letter-spacing: .06em; color: var(--dong); }
.loi-moi { color: var(--chu-phu); max-width: 62ch; }
.tinh-hinh { font-size: 14px; color: var(--chu-phu); font-variant-numeric: tabular-nums; }
.bao { padding: 12px 14px; border-radius: 6px; background: var(--dong-nhat); }
.ds-cau { display: grid; gap: 20px; }
.cau { background: var(--mat); border: 1px solid var(--vien); border-radius: 8px; padding: 20px; display: grid; gap: 14px; min-width: 0; }
.cau-dau { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.ma { font-size: 13px; font-weight: 600; color: var(--ngoc); font-variant-numeric: tabular-nums; }
.the { font-size: 12px; font-weight: 500; padding: 1px 8px; border-radius: 99px; background: var(--dong-nhat); color: var(--dong); }
.the.chot { background: var(--ngoc); color: var(--tren-ngoc); }
.boi-canh { color: var(--chu-phu); max-width: 65ch; }
fieldset { border: 0; margin: 0; padding: 0; display: grid; gap: 8px; min-width: 0; }
legend { padding: 0; margin-bottom: 8px; font-size: 13px; font-weight: 600; }
.lc { display: grid; grid-template-columns: 20px 1fr; gap: 10px; padding: 10px 12px; border: 1px solid var(--vien); border-radius: 6px; cursor: pointer; }
.lc:has(input:checked) { border-color: var(--ngoc); background: var(--ngoc-nhat); }
.lc:has(input:disabled) { cursor: default; }
.lc input { margin: 4px 0 0; align-self: start; accent-color: var(--ngoc); }
.lc-ten { font-weight: 500; }
.lc-ta { display: block; font-size: 14px; color: var(--chu-phu); }
.de-xuat { font-size: 12px; font-weight: 500; color: var(--dong); margin-left: 6px; white-space: nowrap; }
label.nhan { font-size: 13px; font-weight: 600; display: block; margin-bottom: 6px; }
textarea { width: 100%; min-height: 76px; resize: vertical; padding: 10px 12px; font: inherit; color: inherit; background: var(--nen); border: 1px solid var(--vien); border-radius: 6px; }
button { font: inherit; font-weight: 600; cursor: pointer; padding: 10px 18px; border-radius: 6px; border: 1px solid var(--ngoc); background: var(--ngoc); color: var(--tren-ngoc); }
button.phu { background: transparent; color: var(--ngoc); }
button:disabled { opacity: .55; cursor: default; }
:focus-visible { outline: 2px solid var(--dong); outline-offset: 2px; }
.y-team { border-top: 1px solid var(--vien); padding-top: 12px; display: grid; gap: 10px; }
.y-team h3 { margin: 0; font-size: 13px; font-weight: 600; }
.y { font-size: 14px; display: grid; gap: 2px; min-width: 0; overflow-wrap: anywhere; }
.y b { font-weight: 600; }
.y span { color: var(--chu-phu); }
.chot-hop { border-top: 1px solid var(--vien); padding-top: 12px; display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.chot-hop select { font: inherit; color: inherit; background: var(--nen); border: 1px solid var(--vien); border-radius: 6px; padding: 9px 10px; max-width: 100%; }
.day-gui {
  position: sticky; bottom: 0; background: var(--mat); border-top: 1px solid var(--vien);
  padding-block: 12px calc(12px + env(safe-area-inset-bottom, 0px));
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.day-trong { max-width: 760px; margin: 0 auto; display: flex; gap: 12px; flex-wrap: wrap; align-items: center; justify-content: space-between; }
#ket-qua { flex: 1 1 260px; min-width: 0; font-size: 14px; }
#ket-qua.loi { color: var(--loi); }