/* deu-uebung.css — luyện lẻ Viết / Nói A1, A2, B1 (/writing-speaking, public/deu/uebung/{index,task}.php). Giao diện 13/10/2026: cùng khuôn
   danh sách đề / kết quả thi thử (dải đậm + thẻ chồng mép dải, thanh điểm, thẻ chấm AI). Làm lại danh sách 20/10/2026: ô cấp độ, ô Làm tiếp,
   các phần của đề, thanh lọc (phần thi · trạng thái · tìm), nhóm chỉ chữ; trang làm bài thêm bản nháp, khung thư, đánh dấu ý.
   Chỉ token màu (tự lật chế độ tối). */
.du { --du-ok: var(--color-gender-das); --du-ok-soft: var(--color-gender-das-soft); --du-ok-fg: var(--color-gender-das-fg);
      --du-no-soft: var(--color-gender-die-soft); --du-no-fg: var(--color-gender-die-fg); --du-mid: var(--color-brand-gold); --du-link: var(--lv-brand-fg); }
html[data-user-theme="dark"] .du { --du-link: color-mix(in srgb, var(--color-primary) 32%, var(--color-on-dark)); }
@media (prefers-color-scheme: dark) { html[data-user-theme="system"] .du { --du-link: color-mix(in srgb, var(--color-primary) 32%, var(--color-on-dark)); } }
.du .lv-ico, .du svg { flex: none; }

/* ── Dải đầu ──────────────────────────────────────────────────────────────────────────────────────── */
.du-band { --lv-band-pb: 104px; }
.du-band--task { --lv-band-pb: 96px; }
.du-hero { display: flex; align-items: center; justify-content: space-between; gap: 28px; flex-wrap: wrap; }
.du-hero__l { flex: 1 1 440px; min-width: 0; }
.du-title { font-size: clamp(26px, 3vw, 38px); font-weight: 700; letter-spacing: -.025em; line-height: 1.15; }
.du-title span { color: var(--color-brand-gold); }
.du-kicker { margin: 0 0 8px !important; font-size: 13px; color: var(--lv-on-2); }
.du-kicker a { color: var(--lv-on); text-decoration: underline; text-underline-offset: 3px; }
.du-stats { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 18px; }
.du-stats .lv-chip-d { gap: 6px; }
/* Ô số liệu (danh sách, đã đăng nhập): đã làm · đã đạt · lượt chấm hôm nay */
.du-sum { flex: none; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); padding: 0 !important; overflow: hidden; color: var(--lv-on); max-width: 470px; }
.du-sum > div { display: flex; flex-direction: column; gap: 3px; padding: 16px 18px 12px; min-width: 0; }
.du-sum > div + div { border-left: 1px solid var(--lv-line-d); }
.du-sum small { font-size: 12.5px; font-weight: 600; color: var(--color-brand-gold); white-space: nowrap; }
.du-sum b { font-size: 28px; font-weight: 700; letter-spacing: -.02em; line-height: 1.1; }
.du-sum b i { font-style: normal; font-size: 15px; font-weight: 500; color: var(--lv-on-2); margin-left: 1px; }
.du-sum div > span { font-size: 12.5px; color: var(--lv-on-2); }
.du-sum__bar { display: block; height: 5px; margin-top: 5px; border-radius: 999px; background: color-mix(in srgb, var(--color-on-dark) 16%, transparent); }
.du-sum__bar i { display: block; height: 100%; border-radius: inherit; background: var(--color-on-dark); }
.du-sum__bar.is-full i { background: var(--du-mid); }
.du-sum__n { grid-column: 1 / -1; margin: 0 !important; padding: 9px 18px 12px; border-top: 1px solid var(--lv-line-d); font-size: 12.5px; line-height: 1.45; color: var(--lv-on-2); }

/* ── Danh sách ────────────────────────────────────────────────────────────────────────────────────── */
.du-body { position: relative; z-index: 1; margin-top: -76px; }
.du--list .du-body { display: flex; flex-direction: column; gap: 16px; }
.du--list .du-body > .lv-card, .du--list .du-body > section, .du--list .du-body > nav, .du--list .du-body > div { margin: 0; }
.du [lang="de"] { hyphens: manual; -webkit-hyphens: manual; }   /* site-deu.css đặt hyphens:auto cho [lang=de] ⇒ "Fri-seur" */

/* Ô cấp độ (cùng kiểu trang Hội thoại / Ngữ pháp / der · die · das) */
.du-levels { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.du .lv-card.du-lv { display: flex; flex-direction: column; gap: 5px; padding: 16px 18px; text-decoration: none; color: var(--lv-text); box-shadow: none;
    transition: border-color .15s, box-shadow .15s; }
.du-lv:hover { border-color: color-mix(in srgb, var(--color-primary) 40%, var(--lv-hair)); box-shadow: var(--lv-sh-2); }
.du-lv:focus-visible { outline: 2px solid var(--du-link); outline-offset: 2px; }
.du-lv__top { display: flex; align-items: baseline; gap: 10px; min-width: 0; }
.du-lv__top b { font-size: 26px; line-height: 1; font-weight: 800; letter-spacing: -.03em; color: var(--lv-ink); }
.du-lv__top span { font-size: 14px; font-weight: 600; color: var(--lv-ink); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.du-lv small { font-size: 13px; color: var(--lv-muted); }
.du-lv__bar { display: block; height: 5px; margin-top: 4px; border-radius: 999px; overflow: hidden; background: var(--lv-sunken); }
.du-lv__bar i { display: block; height: 100%; border-radius: inherit; background: var(--lv-brand-strong); }
.du .lv-card.du-lv.is-on { border-color: transparent; color: var(--lv-on-2);
    background: radial-gradient(80% 120% at 100% 0%, color-mix(in srgb, var(--color-brand-gold) 26%, transparent), transparent 62%),
                linear-gradient(155deg, var(--color-primary), color-mix(in srgb, var(--color-primary) 58%, black));
    box-shadow: 0 14px 30px -18px color-mix(in srgb, var(--color-primary) 90%, transparent); }
.du-lv.is-on .du-lv__top b { color: var(--color-brand-gold); }
.du-lv.is-on .du-lv__top span { color: var(--color-on-dark); }
.du-lv.is-on small { color: color-mix(in srgb, var(--color-on-dark) 78%, transparent); }
.du-lv.is-on .du-lv__bar { background: color-mix(in srgb, var(--color-on-dark) 22%, transparent); }
.du-lv.is-on .du-lv__bar i { background: var(--color-brand-gold); }

/* Làm tiếp */
.du .lv-card.du-next { display: flex; align-items: center; justify-content: space-between; gap: 14px 24px; padding: 18px 22px; text-decoration: none;
    color: var(--lv-text); border-left: 4px solid var(--color-primary); transition: border-color .15s, box-shadow .15s; }
a.du-next:hover { box-shadow: var(--lv-sh-2); }
.du-next__l { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.du-next__l small { font-size: 13px; font-weight: 600; color: var(--du-link); }
.du-next__l b { font-size: 18px; font-weight: 700; color: var(--lv-ink); letter-spacing: -.01em; }
.du-next__p { font-size: 14px; line-height: 1.5; color: var(--lv-muted); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.du-next__go { flex: none; }
.du-next--done { border-left-color: var(--du-ok) !important; }

/* Các phần của đề */
.du-parts h2 { margin: 6px 0 10px !important; font-size: 16px; font-weight: 700; color: var(--lv-ink); }
.du-parts__row { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; }
.du-part { display: flex; flex-direction: column; gap: 3px; padding: 12px 14px; border-radius: 14px; border: 1px solid var(--lv-hair);
    background: var(--lv-surface); text-decoration: none; color: var(--lv-text); border-top: 3px solid var(--color-primary); transition: border-color .15s; }
.du-part--sprechen { border-top-color: var(--color-brand-gold); }
.du-part:hover { border-color: color-mix(in srgb, var(--color-primary) 35%, var(--lv-hair)); }
.du-part small { font-size: 12px; font-weight: 600; color: var(--lv-muted); }
.du-part b { font-size: 14.5px; font-weight: 700; line-height: 1.3; color: var(--lv-ink); }
.du-part span { margin-top: auto; padding-top: 4px; font-size: 12.5px; color: var(--lv-text); }

/* Thanh lọc */
.du-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; margin-top: 8px !important; }
.du-seg { display: inline-flex; flex-wrap: wrap; gap: 4px; padding: 4px; border-radius: 13px; background: var(--lv-sunken); }
.du-seg button { display: inline-flex; align-items: center; gap: 7px; height: 36px; padding: 0 13px; border: 0; border-radius: 10px;
    background: transparent; font: inherit; font-size: 14px; font-weight: 600; color: var(--lv-muted); cursor: pointer; }
.du-seg button i { font-style: normal; font-size: 12.5px; font-weight: 700; color: var(--lv-faint); }
.du-seg button:hover { color: var(--lv-ink); }
.du-seg button.is-on { background: var(--lv-surface); color: var(--lv-ink); box-shadow: 0 1px 2px color-mix(in srgb, var(--lv-shade, black) 18%, transparent); }
.du-seg button.is-on i { color: var(--du-link); }
.du-seg button:focus-visible { outline: 2px solid var(--du-link); outline-offset: 1px; }
.du-find { flex: 1 1 220px; display: flex; }
.du-find input { width: 100%; height: 44px; padding: 0 14px; border: 1px solid var(--lv-hair); border-radius: 12px; background: var(--lv-surface);
    color: var(--lv-ink); font: inherit; font-size: 14.5px; }
.du-find input:focus { outline: none; border-color: var(--color-primary); }

/* Nhóm theo Teil */
.du-group { scroll-margin-top: calc(var(--nav-h, 64px) + 14px); margin-top: 8px !important; }
.du-group[hidden] { display: none; }
.du-group__h { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 12px; padding-bottom: 10px; border-bottom: 1px solid var(--lv-hair); }
.du-group__h > div { flex: 1; min-width: 0; }
.du-group__k { margin: 0 0 2px !important; font-size: 13px; font-weight: 600; color: var(--du-link); }
.du-group__h h2 { font-size: 19px; font-weight: 700; letter-spacing: -.01em; color: var(--lv-ink); }
.du-group__h div > p:last-child { margin: 4px 0 0 !important; font-size: 13.5px; line-height: 1.5; color: var(--lv-muted); max-width: 720px; }
.du-group__n { flex: none; padding: 4px 10px; border-radius: 999px; font-size: 12.5px; font-weight: 600; background: var(--lv-sunken); color: var(--lv-ink); }
.du-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 12px; }
.du .lv-card.du-card { display: flex; flex-direction: column; gap: 6px; padding: 14px 16px; text-decoration: none; color: var(--lv-text);
    transition: border-color .15s, transform .15s, box-shadow .15s; }
.du-card[hidden] { display: none !important; }
.du-card:hover { border-color: color-mix(in srgb, var(--color-primary) 35%, var(--lv-hair)); transform: translateY(-1px); }
.du-card__top { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.du-tag { padding: 2px 8px; border-radius: 6px; font-size: 11.5px; font-weight: 600; background: var(--du-ok-soft); color: var(--du-ok-fg); }
.du-tag--ai { background: var(--lv-wash); color: var(--du-link); }
.du-card__max { font-size: 12px; color: var(--lv-muted); }
.du-card b { font-size: 15px; font-weight: 600; color: var(--lv-ink); }
.du-card small { font-size: 13px; line-height: 1.45; color: var(--lv-muted); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.du-card__st { margin-top: auto; padding-top: 8px; display: flex; flex-direction: column; gap: 6px; font-size: 13px; font-weight: 500; }
.du-card__sc { display: flex; justify-content: space-between; gap: 8px; color: var(--lv-ink); }
.du-card__sc em { font-style: normal; font-weight: 600; color: var(--du-no-fg); }
.du-card.is-ok .du-card__sc em { color: var(--du-ok-fg); }
.du-card__wait { color: var(--lv-muted); }
.du-card__new { color: var(--du-link); font-weight: 600; }
.du-card.is-ok { border-color: color-mix(in srgb, var(--du-ok) 35%, var(--lv-hair)); }
.du-meter { position: relative; display: block; height: 6px; border-radius: 999px; background: var(--lv-sunken); }
.du-meter i { display: block; height: 100%; border-radius: inherit; background: var(--du-mid); }
.du-meter.is-ok i { background: var(--du-ok); }
.du-empty { margin: 0 !important; font-size: 14.5px; color: var(--lv-text); }
.du-empty[hidden] { display: none; }
.du-empty button { margin-left: 6px; padding: 0; border: 0; background: none; font: inherit; font-weight: 600; color: var(--du-link); text-decoration: underline; cursor: pointer; }

/* ── Làm bài: hai cột ─────────────────────────────────────────────────────────────────────────────── */
.du-cols { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: 18px; align-items: start; }
.du-col { display: flex; flex-direction: column; gap: 14px; min-width: 0; }
.du-col--task { position: sticky; top: calc(var(--nav-h, 64px) + 14px); }
.du .lv-card { padding: 20px 22px; }
.du-col h2 { margin: 0 0 10px !important; font-size: 16px; font-weight: 700; color: var(--lv-ink); }
.du-de { margin: 0 0 8px !important; font-size: 16px; line-height: 1.65; color: var(--lv-ink); }
.du-vi { margin: 0 !important; font-size: 14px; color: var(--lv-text); line-height: 1.55; }
.du-note { margin: 10px 0 0 !important; padding: 10px 12px; border-radius: 10px; background: var(--lv-sunken); font-size: 13.5px; color: var(--lv-text); line-height: 1.55; }
.du-tr summary, .du-mine summary { width: fit-content; cursor: pointer; font-size: 13.5px; font-weight: 600; color: var(--du-link); }
.du-tr p { margin: 6px 0 0 !important; font-size: 14px; line-height: 1.6; color: var(--lv-text); }
.du-points { margin: 6px 0 0; padding: 0; list-style: none; counter-reset: pt; display: grid; gap: 8px; }
.du-points li { counter-increment: pt; display: grid; grid-template-columns: 26px 1fr; column-gap: 10px; }
.du-points li::before { content: counter(pt); grid-row: 1 / 3; width: 24px; height: 24px; display: grid; place-items: center; border-radius: 7px;
    font-size: 12.5px; font-weight: 700; background: var(--color-primary); color: var(--color-on-dark); }
.du-points b { font-weight: 600; color: var(--lv-ink); }
.du-points small { color: var(--lv-muted); font-size: 13px; }

/* Mẫu đơn */
.du-form { display: flex; flex-direction: column; gap: 10px; }
.du-field { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: 4px 12px; align-items: center; padding: 8px 0; border-bottom: 1px solid var(--lv-hair); }
.du-field > span { display: flex; flex-direction: column; }
.du-field b { font-size: 14.5px; font-weight: 600; color: var(--lv-ink); }
.du-field small { color: var(--lv-muted); font-size: 12.5px; }
.du-field input { width: 100%; height: 42px; padding: 0 12px; border: 1.5px solid var(--lv-hair); border-radius: 10px; font: inherit; font-size: 15px;
    background: var(--lv-surface); color: var(--lv-ink); transition: border-color .15s; }
.du-field input:focus { outline: none; border-color: var(--color-primary); }
.du-field.is-ok input { border-color: var(--du-ok); background: var(--du-ok-soft); }
.du-field.is-bad input { border-color: var(--color-gender-die); background: var(--du-no-soft); }
.du-field__fb { grid-column: 2; font-style: normal; font-size: 13px; font-weight: 600; color: var(--du-ok-fg); }

/* Viết tin nhắn */
.du-write textarea { width: 100%; min-height: 200px; padding: 14px 16px; border: 1.5px solid var(--lv-hair); border-radius: 12px; font: inherit; font-size: 16px;
    line-height: 1.65; resize: vertical; background: var(--lv-surface); color: var(--lv-ink); transition: border-color .15s; }
.du-write textarea:focus { outline: none; border-color: var(--color-primary); }
.du-wc { display: flex; align-items: center; gap: 12px; margin-top: 10px; }
.du-wc .du-count { flex: none; }
.du-wc__bar { flex: 1; height: 6px; border-radius: 999px; background: var(--lv-sunken); overflow: hidden; }
.du-wc__bar i { display: block; height: 100%; width: 0; border-radius: inherit; background: var(--du-mid); transition: width .2s; }
.du-wc__bar.is-ok i { background: var(--du-ok); }
.du-act { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 14px; }
.du-act .lv-btn { margin-left: auto; }
.du-count { font-size: 13px; color: var(--lv-muted); }

/* Thẻ đề Nói */
.du-cardbox { display: flex; flex-direction: column; align-items: center; gap: 8px; margin-bottom: 14px; padding: 18px 16px 20px; text-align: center;
    border: 2px dashed color-mix(in srgb, var(--color-primary) 35%, var(--lv-hair)); border-radius: 16px; background: var(--lv-surface); }
.du-cardbox > small { font-size: 13px; font-weight: 600; color: var(--lv-muted); }
.du-cardbox p { margin: 0 !important; }
.du-cardbox__th { font-size: 14px; color: var(--lv-text); }
.du-cardbox__w { font-size: clamp(24px, 4vw, 32px); font-weight: 700; letter-spacing: -.01em; color: var(--lv-ink); }
.du-cardbox__vi { font-size: 13.5px; color: var(--lv-muted); }
/* Thẻ nhiều dòng (A2 lịch hẹn, thẻ 4 gợi ý; B1 tình huống + gạch đầu dòng, 5 slide): chữ thường, căn trái */
.du-cardbox__w--multi { align-self: stretch; font-size: 15.5px; font-weight: 500; line-height: 1.7; letter-spacing: 0; text-align: left; hyphens: manual; -webkit-hyphens: manual; }
.du-say--big { display: inline-flex; align-items: center; gap: 8px; margin-top: 4px; }
.du-ic { display: inline-grid; place-items: center; width: 32px; height: 32px; vertical-align: middle; border-radius: 50%; border: 1px solid var(--lv-hair);
    background: var(--lv-surface); color: var(--lv-ink); cursor: pointer; }
.du-ic.is-playing { background: var(--lv-wash); }

/* Ghi âm: như phòng thi */
.du-consent { display: flex; gap: 12px; align-items: flex-start; padding: 12px 14px; border-radius: 12px; cursor: pointer; font-size: 13.5px; color: var(--lv-text);
    background: var(--lv-sunken); border-left: 4px solid var(--du-mid); }
.du-consent:has(input:checked) { border-left-color: var(--du-ok); }
.du-consent input { width: 18px; height: 18px; margin-top: 2px; accent-color: var(--color-primary); flex: none; }
.du-consent b { display: block; font-weight: 600; color: var(--lv-ink); margin-bottom: 2px; }
.du-recbox { display: flex; flex-direction: column; align-items: center; gap: 10px; padding: 22px 0 6px; }
.du-recbtn { display: inline-flex; flex-direction: column; align-items: center; gap: 10px; border: 0; background: transparent; cursor: pointer; font: inherit;
    font-size: 14px; font-weight: 600; color: var(--lv-ink); }
.du-recbtn .lv-ico, .du-recbtn svg { width: 72px; height: 72px; padding: 22px; border-radius: 50%; box-sizing: border-box;
    background: var(--color-primary); color: var(--color-on-dark); box-shadow: 0 10px 24px -12px var(--color-primary); transition: transform .15s; }
.du-recbtn:hover .lv-ico, .du-recbtn:hover svg { transform: scale(1.04); }
.du-recbtn.is-rec .lv-ico, .du-recbtn.is-rec svg { background: var(--color-danger); animation: du-pulse 1.2s infinite; }
@keyframes du-pulse { 50% { box-shadow: 0 0 0 10px color-mix(in srgb, var(--color-danger) 22%, transparent); } }
.du-recbtn:disabled { opacity: .6; cursor: default; }
#duAudio { width: 100%; margin-top: 12px; }

/* Kết quả chấm */
.du-quota-line { margin: -4px 2px 0 !important; font-size: 13px; color: var(--lv-muted); }
.du-res { display: flex; flex-direction: column; gap: 12px; }
.du-res p { margin: 0 !important; }
.du-res__h { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.du-res__h small { font-size: 14px; font-weight: 700; color: var(--lv-ink); }
.du-res__s { margin-left: auto; display: inline-flex; align-items: baseline; gap: 2px; padding: 5px 14px; border-radius: 999px; font-size: 14px;
    background: var(--du-no-soft); color: var(--du-no-fg); }
.du-res__s b { font-size: 22px; font-weight: 700; }
.du-res__s.is-ok { background: var(--du-ok-soft); color: var(--du-ok-fg); }
.du-res__sub { font-size: 14px; color: var(--lv-text); }
.du-res__wait { color: var(--lv-text); font-size: 14px; }
.du-xp { display: inline-block; padding: 2px 10px; border-radius: 999px; background: var(--color-accent-soft); color: var(--color-accent-deep); font-size: 12.5px; font-weight: 600; }
.du-pts { margin: 0; padding: 12px 14px; list-style: none; display: grid; gap: 8px; border-radius: 12px; background: var(--lv-sunken); }
.du-pts li { display: grid; grid-template-columns: minmax(0, 1fr) 100px 40px; gap: 12px; align-items: center; font-size: 13.5px; color: var(--lv-text); }
.du-pts i { font-style: normal; color: var(--lv-ink); }
.du-pts b { text-align: right; font-weight: 600; color: var(--lv-ink); }
.du-pts .du-meter { background: var(--lv-surface); }
.du-heard { display: grid; gap: 6px; }
.du-heard audio { width: 100%; height: 40px; }
.du-heard small { font-size: 12.5px; color: var(--lv-muted); }
.du-res blockquote { margin: 6px 0 0; padding: 12px 14px; border-radius: 10px; border-left: 3px solid var(--lv-hair); background: var(--lv-sunken);
    font-size: 15px; line-height: 1.6; color: var(--lv-ink); }
.du-cmt { padding: 12px 14px; border-radius: 12px; background: var(--lv-wash); }
.du-cmt b, .du-fixbox > b { display: block; margin-bottom: 4px; font-size: 13px; font-weight: 600; color: var(--lv-ink); }
.du-cmt p { font-size: 14px; line-height: 1.6; color: var(--lv-text); }
.du-fix { margin: 0; padding: 0; list-style: none; }
.du-fix li { display: grid; gap: 2px; padding: 8px 0; border-bottom: 1px solid var(--lv-hair); font-size: 14.5px; }
.du-fix li:last-child { border-bottom: 0; }
.du-fix s { color: var(--du-no-fg); text-decoration-thickness: 1.5px; }
.du-fix em { margin: 0 8px; font-style: normal; color: var(--lv-muted); }
.du-fix ins { text-decoration: none; font-weight: 600; color: var(--du-ok-fg); }
.du-fix small { font-size: 12.5px; color: var(--lv-muted); }
.du-ff { margin: 0; padding: 0; list-style: none; display: grid; gap: 6px; }
.du-ff li { display: grid; grid-template-columns: 22px minmax(0, 1fr); column-gap: 10px; align-items: center; font-size: 14px; color: var(--lv-text); }
.du-ff i { width: 22px; height: 22px; display: grid; place-items: center; border-radius: 50%; font-style: normal; font-size: 11px; font-weight: 700;
    background: var(--du-ok); color: var(--color-on-dark); }
.du-ff li.is-no i { background: var(--color-gender-die); }
.du-ff b { font-weight: 600; color: var(--lv-ink); }
.du-ff small { grid-column: 2; font-size: 12.5px; color: var(--du-ok-fg); }

.du-model summary { cursor: pointer; font-size: 14.5px; font-weight: 600; color: var(--lv-ink); }
.du-model[open] summary { margin-bottom: 10px; }
.du-alt { margin: 10px 0 0 !important; font-size: 15px; color: var(--lv-text); }
.du-alt span { color: var(--lv-muted); font-size: 13px; }
.du-hist ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 4px; }
.du-hist li { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 12px; padding: 6px 0; border-bottom: 1px solid var(--lv-hair); font-size: 13.5px; }
.du-hist li:last-child { border-bottom: 0; }
.du-hist li span { color: var(--lv-muted); font-variant-numeric: tabular-nums; }
.du-hist li b { font-weight: 600; color: var(--lv-ink); }
.du-hist li .lv-btn { margin-left: auto; }

/* Bài trước / Bài tiếp */
.du-pager { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 22px; }
.du .lv-card.du-pager__a { display: flex; align-items: center; gap: 12px; padding: 14px 16px; text-decoration: none; color: var(--lv-muted); transition: border-color .15s; }
.du-pager__a:hover { border-color: color-mix(in srgb, var(--color-primary) 35%, var(--lv-hair)); }
.du-pager__a span { display: flex; flex-direction: column; min-width: 0; }
.du-pager__a small { font-size: 12px; color: var(--lv-muted); }
.du-pager__a b { font-size: 14.5px; font-weight: 600; color: var(--lv-ink); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.du-pager__a--next { grid-column: 2; justify-content: flex-end; text-align: right; }

@media (max-width: 960px) {
  .du-cols { grid-template-columns: 1fr; }
  .du-col--task { position: static; }
}
@media (max-width: 720px) {
  .du-body { margin-top: -64px; }
  .du-sum { max-width: none; width: 100%; }
  .du-sum > div { padding: 12px 12px 10px; }
  .du-sum small { font-size: 11.5px; white-space: normal; line-height: 1.3; }
  .du-sum b { font-size: 23px; }
  .du-sum b i { font-size: 13px; }
  .du-sum div > span { font-size: 11.5px; }
  .du-sum__n { padding: 8px 12px 10px; font-size: 12px; }
  .du-levels { grid-template-columns: minmax(0, 1fr); gap: 8px; }
  .du .lv-card.du-lv { padding: 12px 14px; gap: 4px; }
  .du-lv__top b { font-size: 22px; }
  .du-lv small { font-size: 12.5px; }
  .du .lv-card.du-next { flex-direction: column; align-items: stretch; padding: 16px; }
  .du-next__go { justify-content: center; }
  .du-parts__row { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .du-seg { width: 100%; flex-wrap: nowrap; }
  .du-seg button { flex: 1 1 auto; justify-content: center; gap: 4px; padding: 0 7px; font-size: 13px; white-space: nowrap; }
}
@media (max-width: 560px) {
  .du .lv-card { padding: 16px; }
  .du-field { grid-template-columns: minmax(0, 1fr); }
  .du-field__fb { grid-column: 1; }
  .du-pts li { grid-template-columns: minmax(0, 1fr) 40px; }
  .du-pts li .du-meter { grid-column: 1 / -1; order: 3; }
  .du-pager { grid-template-columns: 1fr; }
  .du-pager__a--next { grid-column: 1; }
}


/* ── Trang làm bài: phần thêm 20/10/2026 ─────────────────────────────────────────────────────────── */
.du-pt { display: flex; align-items: flex-start; gap: 10px; cursor: pointer; }
.du-pt > span { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.du-pt input { order: 2; flex: none; width: 18px; height: 18px; margin: 3px 0 0; accent-color: var(--du-ok); cursor: pointer; }
.du-pt:has(input:checked) b, .du-pt:has(input:checked) small { color: var(--lv-muted); }
.du-pt:has(input:checked) b { text-decoration: line-through; text-decoration-color: color-mix(in srgb, var(--lv-muted) 60%, transparent); }
.du-pts-hint { margin: 8px 0 0 !important; font-size: 12.5px; color: var(--lv-muted); }
.du-tools { display: flex; flex-wrap: wrap; gap: 8px; margin: -2px 0 10px; }
.du-draft { margin: 8px 0 0 !important; font-size: 13px; color: var(--lv-muted); }
.du-draft[hidden] { display: none; }
.du-draft button { padding: 0; border: 0; background: none; font: inherit; font-weight: 600; color: var(--du-link); text-decoration: underline; cursor: pointer; }
.du-kbd { font-size: 12.5px; color: var(--lv-muted); }
@media (hover: none) { .du-kbd { display: none; } }
.du-res__act { display: flex; flex-wrap: wrap; gap: 8px; padding-top: 4px; border-top: 1px solid var(--lv-hair); margin-top: 2px; }
.du-res__act .lv-btn { max-width: 100%; }
.du-res__act .lv-btn span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }