/* Đọc chính tả (/cong-cu/doc-chinh-ta). Tệp nạp ở mọi trang → mọi lớp có tiền tố dc-. */
.chinh:has(> .dc) { max-width: 1100px; }
.dc-an { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.dc-dau { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: 12px; margin-bottom: 10px; }
.dc-dau h1 { margin: 0; }
.dc-dau .phu { margin: 2px 0 0; }
.dc-dau__phai { display: flex; gap: 10px; align-items: flex-end; flex-wrap: wrap; }
.dc-chon { min-width: 280px; }
.dc-luu-y { margin: 0 0 12px; }
.dc-thieu p { margin: 0 0 6px; }
.dc-thieu details summary { cursor: pointer; font-weight: 700; }
.dc-thieu ul { margin: 8px 0; padding-left: 20px; }
.dc-thieu li { margin-bottom: 6px; }

.dc-tab { display: flex; gap: 6px; overflow-x: auto; margin-bottom: 12px; }
.dc-tab [role="tab"] { flex: none; min-height: 46px; padding: 8px 18px; border-radius: 999px; border: 1px solid var(--vien); background: var(--the);
  color: var(--chu); font: inherit; font-weight: 700; cursor: pointer; }
.dc-tab [role="tab"]:hover { border-color: var(--c-vien); color: var(--c-dam); }
.dc-tab [role="tab"][aria-selected="true"] { background: var(--c-dam); border-color: var(--c-dam); color: #fff; }
.dc-h { font-size: 1rem; margin: 0 0 10px; }

/* Màn đọc (chiếu lên lớp được) */
.dc-man { background: var(--c-dam); color: #fff; border-radius: var(--r); padding: clamp(18px, 3vw, 36px); text-align: center; margin-bottom: 14px; }
.dc-man__ten { margin: 0 0 4px; font-weight: 600; color: var(--nhan); }
.dc-man__so { margin: 0; font-size: clamp(2rem, 6vw, 4rem); font-weight: 900; line-height: 1.15; }
.dc-tien { max-width: 560px; margin: 12px auto; background: rgba(255,255,255,.18); }
.dc-tien > span { background: var(--nhan); transition: width .3s; }
.dc-man__tt { min-height: 1.6em; margin: 0 0 8px; font-size: 1.125rem; }
.dc-man__chu { margin: 4px auto 16px; max-width: 900px; font-size: clamp(1.5rem, 4.2vw, 3rem); font-weight: 800; line-height: 1.3; }
.dc-man__chu[hidden] { display: none; }
.dc-dk { justify-content: center; }
.dc-man .nut--vien { color: #fff; border-color: rgba(255,255,255,.45); }
.dc-man .nut--vien:hover { background: rgba(255,255,255,.12); color: #fff; }
.dc-man .nut { background: var(--nhan); border-color: var(--nhan); color: var(--c-dam); }
.dc-man .nut:hover { background: #f5cf7d; border-color: #f5cf7d; color: var(--c-dam); }
.dc-man .nut.nut--vien { background: transparent; color: #fff; border-color: rgba(255,255,255,.45); }
.dc-nut-to { min-height: 52px; padding: 12px 28px; font-size: 1.1rem; min-width: 170px; }
.dc-man:fullscreen { display: flex; flex-direction: column; justify-content: center; border-radius: 0; }
.dc-man:fullscreen .dc-man__so { font-size: clamp(3rem, 9vw, 7rem); }
.dc-man:fullscreen .dc-man__chu { font-size: clamp(2rem, 6vw, 5rem); }
.dc-man:-webkit-full-screen { display: flex; flex-direction: column; justify-content: center; }

.dc-cai { padding: 14px 16px; }
.dc-cai__luoi { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.dc-cai__luoi .field:first-child { grid-column: span 2; }
.dc-chk { display: flex; flex-wrap: wrap; gap: 8px 22px; margin: 12px 0 0; }
.dc-chk label { display: inline-flex; gap: 8px; align-items: center; font-weight: 600; font-size: .9375rem; min-height: 32px; cursor: pointer; }
.dc-chk input { width: 20px; height: 20px; }

.dc-ds-khung { padding: 12px 16px; }
.dc-ds-khung > summary { cursor: pointer; margin: 0; }
.dc-ds { margin: 10px 0 0; padding-left: 28px; columns: 2 260px; column-gap: 24px; }
.dc-ds li { break-inside: avoid; margin-bottom: 4px; }
.dc-ds__nut { border: 0; background: none; padding: 4px 6px; border-radius: 6px; font: inherit; color: var(--chu); text-align: left; cursor: pointer; }
.dc-ds__nut:hover { background: var(--c-nhat); }
.dc-ds__nut[aria-current="true"] { background: var(--nhan-nhat); color: var(--nhan-dam); font-weight: 700; }

/* Luyện viết */
.dc-viet { padding: 14px 16px; }
.dc-viet__so { font-weight: 800; font-size: 1.125rem; margin: 0 0 10px; }
.dc-go { margin: 14px 0 0; }
.dc-go textarea { font-size: 1.25rem; line-height: 1.6; min-height: 180px; }
.dc-viet > .hang-nut:last-child { margin-top: 12px; }
.dc-kq { padding: 14px 16px; }
.dc-kq__tong { font-weight: 700; font-size: 1.125rem; }
.dc-kq__bai { font-size: 1.25rem; line-height: 2.1; }
.dc-w { display: inline-block; padding: 0 5px; border-radius: 6px; line-height: 1.6; }
.dc-w--dung { color: var(--xanh-la); }
.dc-w--sai { background: var(--do-nhat); color: var(--do); }
.dc-w--sai s { color: #7a1a12; opacity: .8; }
.dc-w--thieu { border: 2px dashed var(--do); color: var(--do); }
.dc-w--thua { background: var(--nhan-nhat); color: var(--nhan-dam); text-decoration: line-through; }
.dc-chu-giai { list-style: none; margin: 10px 0 0; padding: 10px 0 0; border-top: 1px solid var(--vien); display: flex; flex-wrap: wrap; gap: 8px 16px; }

/* Soạn bài */
.dc-soan { padding: 16px; }
.dc-soan__hang { display: grid; gap: 12px; grid-template-columns: 1fr; }
@media (min-width: 760px) { .dc-soan__hang { grid-template-columns: minmax(0, 1fr) 200px 160px; } }
.dc-soan__nut { margin-top: 14px; }
.dc-bao { margin-top: 12px; }
.dc-bao:empty { display: none; }

@media (max-width: 640px) {
  .dc-chon { min-width: 0; flex: 1; }
  .dc-dau__phai { width: 100%; }
  .dc-cai__luoi .field:first-child { grid-column: auto; }
  .dc-dk .nut { flex: 1 1 45%; }
  .dc-nut-to { flex-basis: 100% !important; }
}