/* =====================================================================================
   HỎI ĐÁP (/Hoidap, /Hoidapmb.aspx, /HoiDaPost.aspx, /HoiDaPostmb.aspx) — 20/10/2026, user: "style lại
   mục hỏi đáp cho đẹp" (ảnh thpthanthuyen.hcm.edu.vn). Trước: thống kê là danh sách chấm, nút "Đặt câu
   hỏi" là ẢNH chữ nghiêng, mỗi câu hỏi một hàng bảng với ô đỏ "1 Trả lời"; biểu mẫu là cột ô nhập dài
   hết khung, ảnh mã bảo vệ lưới xanh lá.
   Nay: thẻ đầu trang có 3 ô số liệu + nút "Đặt câu hỏi"; ô lọc nhanh; mỗi câu hỏi một thẻ (huy hiệu số
   trả lời, tiêu đề, người hỏi · ngày, nội dung gập 3 dòng "Xem thêm"); biểu mẫu 2 cột có nhãn, đếm ký
   tự. Màu theo `--mau-md` (màu chủ đạo đơn vị, khối ThemeStyles). Mã bảo vệ: `.qi-mbv` (qi-nut.css).
   Mọi luật khoá trong `.qi-hd` để không đụng skin từng mẫu giao diện.
   ===================================================================================== */
.qi-hd {
    --hd-md: var(--mau-md, #0071a6);
    --hd-vien: #e2e8f0; --hd-mo: #64748b; --hd-chu: #0f172a;
    display: flex; flex-direction: column; gap: 16px;
    margin: 14px 10px 24px; color: #1f2937; font-size: 15px; line-height: 1.55;
}
.qi-hd *, .qi-hd *::before, .qi-hd *::after { box-sizing: border-box; }
.qi-hd__the {
    background: #fff; border: 1px solid var(--hd-vien); border-radius: 14px;
    padding: 22px 24px; box-shadow: 0 1px 2px rgba(15, 23, 42, .04);
}

/* ---------- Thẻ đầu trang ---------- */
.qi-hd__dau { display: flex; align-items: center; justify-content: space-between; gap: 16px 24px; flex-wrap: wrap; }
.qi-hd__tieude { margin: 0; font-size: 22px; font-weight: 700; line-height: 1.3; color: var(--hd-chu); }
.qi-hd__phu { margin: 4px 0 0; font-size: 14px; color: var(--hd-mo); }
.qi-hd__so { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-top: 18px; }
.qi-hd__o-so {
    display: flex; align-items: center; gap: 12px; padding: 14px 16px; border-radius: 12px;
    background: #f8fafc; border: 1px solid var(--hd-vien);
}
.qi-hd__o-so svg { flex: 0 0 auto; color: var(--hd-md); }
.qi-hd__o-so b { display: block; font-size: 22px; line-height: 1.1; color: var(--hd-chu); font-variant-numeric: tabular-nums; }
.qi-hd__o-so span { font-size: 13px; color: var(--hd-mo); }

.qi-hd .qi-hd__nut, .qi-hd a.qi-hd__nut {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    height: 46px; padding: 0 22px; border: 0; border-radius: 10px;
    background: var(--hd-md); color: #fff !important; font-size: 15px; font-weight: 600;
    text-decoration: none !important; white-space: nowrap; cursor: pointer; transition: filter .15s;
}
.qi-hd .qi-hd__nut:hover { filter: brightness(.92); }
.qi-hd .qi-hd__nut:focus-visible { outline: 3px solid rgba(37, 99, 235, .35); outline-offset: 2px; }
.qi-hd .qi-hd__nut[disabled] { opacity: .7; cursor: progress; }

/* ---------- Thanh lọc ---------- */
.qi-hd__loc { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 6px; }
.qi-hd__loc h3 { margin: 0; font-size: 18px; font-weight: 700; color: var(--hd-chu); }
.qi-hd__tim { position: relative; flex: 0 1 320px; min-width: 0; }
.qi-hd__tim svg { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: #94a3b8; pointer-events: none; }
html body .qi-hd .qi-hd__tim input { padding-left: 38px; height: 42px; }
.qi-hd__khong { padding: 24px 0; text-align: center; color: var(--hd-mo); }

/* ---------- Danh sách câu hỏi ---------- */
.qi-hd__ds { list-style: none; margin: 0; padding: 0; }
.qi-hd__muc { display: flex; gap: 16px; padding: 18px 0; border-top: 1px solid var(--hd-vien); }
.qi-hd__ds .qi-hd__muc:first-child { border-top: 0; }
.qi-hd__huy {
    flex: 0 0 auto; display: flex; flex-direction: column; align-items: center; justify-content: center;
    width: 72px; height: 64px; border-radius: 12px; text-align: center; line-height: 1.1;
    background: #ecfdf5; color: #047857; border: 1px solid #a7f3d0;
}
.qi-hd__huy b { font-size: 20px; }
.qi-hd__huy span { font-size: 11.5px; font-weight: 600; margin-top: 2px; }
.qi-hd__huy--chua { background: #f8fafc; color: var(--hd-mo); border-color: var(--hd-vien); }
.qi-hd__than { min-width: 0; flex: 1 1 auto; }
.qi-hd .qi-hd__tieu {
    display: inline; font-size: 17px; font-weight: 700; line-height: 1.4;
    color: var(--hd-chu); text-decoration: none; overflow-wrap: anywhere;
}
.qi-hd .qi-hd__tieu:hover { color: var(--hd-md); text-decoration: underline; }
.qi-hd__meta { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 14px; margin-top: 4px; font-size: 13.5px; color: var(--hd-mo); }
.qi-hd__meta span { display: inline-flex; align-items: center; gap: 5px; }
.qi-hd__meta b { color: #334155; font-weight: 600; }
.qi-hd__nd {
    margin: 8px 0 0; color: #334155; white-space: pre-line; overflow-wrap: anywhere;
    display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 3; overflow: hidden;
}
.qi-hd__muc.mo-rong .qi-hd__nd { display: block; -webkit-line-clamp: unset; overflow: visible; }
.qi-hd__them {
    margin-top: 4px; padding: 0; border: 0; background: none; cursor: pointer;
    font-size: 13.5px; font-weight: 600; color: var(--hd-md);
}
.qi-hd__them:hover { text-decoration: underline; }

/* ---------- Biểu mẫu đặt câu hỏi ---------- */
.qi-hd__luoi { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.qi-hd__o { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.qi-hd__o--rong { grid-column: 1 / -1; }
.qi-hd label, .qi-hd .qi-mbv > label { margin: 0; font-size: 14px; font-weight: 600; color: #334155; }
.qi-hd__bb { color: #dc2626; margin-left: 2px; }
html body .qi-hd .form-control {
    height: 46px; padding: 0 14px; font-size: 15px; color: var(--hd-chu);
    border: 1px solid #cbd5e1; border-radius: 10px; background: #fff; box-shadow: none;
    transition: border-color .15s, box-shadow .15s;
}
html body .qi-hd textarea.form-control { height: auto; min-height: 150px; padding: 12px 14px; resize: vertical; }
html body .qi-hd select.form-control { padding-right: 32px; }
html body .qi-hd .form-control::placeholder { color: #94a3b8; }
html body .qi-hd .form-control:focus {
    border-color: var(--hd-md); outline: 0;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .18); box-shadow: 0 0 0 3px color-mix(in srgb, var(--hd-md) 22%, transparent);
}
.qi-hd__dem { align-self: flex-end; font-size: 12.5px; color: var(--hd-mo); font-variant-numeric: tabular-nums; }
.qi-hd .qi-mbv { margin: 0; display: flex; flex-direction: column; gap: 6px; }
html body .qi-hd .qi-mbv__anh img, html body .qi-hd .qi-mbv__doi { border-radius: 10px; }
.qi-hd__cuoi { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; margin-top: 4px; padding-top: 18px; border-top: 1px solid var(--hd-vien); }
.qi-hd__luuy { margin: 0; font-size: 13px; color: var(--hd-mo); }
.qi-hd__quaylai { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; font-weight: 600; color: var(--hd-md) !important; text-decoration: none !important; }
.qi-hd__quaylai:hover { text-decoration: underline !important; }

.qi-hd__tb { display: flex; align-items: flex-start; gap: 10px; padding: 12px 14px; border-radius: 10px; font-size: 14.5px; font-weight: 500; }
.qi-hd__tb--ok { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
.qi-hd__tb--loi { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }
.qi-hd__tb--tin { background: #eff6ff; color: #1e3a8a; border: 1px solid #bfdbfe; }

/* ---------- Khổ hẹp ---------- */
@media (max-width: 767.98px) {
    .qi-hd { margin: 10px 0 20px; gap: 12px; }      /* khung vỏ mobile đã chừa 10px mỗi bên ⇒ thẻ đúng mép 10px */
    .qi-hd__the { padding: 16px 14px; border-radius: 12px; }
    .qi-hd__tieude { font-size: 19px; }
    .qi-hd__so { gap: 8px; margin-top: 14px; }
    .qi-hd__o-so { flex-direction: column; align-items: flex-start; gap: 4px; padding: 10px 12px; }
    .qi-hd__o-so svg { display: none; }
    .qi-hd__o-so b { font-size: 20px; }
    .qi-hd__o-so span { font-size: 12px; line-height: 1.3; }
    .qi-hd__dau > .qi-hd__nut, .qi-hd__dau > a.qi-hd__nut { width: 100%; }
    .qi-hd__tim { flex-basis: 100%; }
    .qi-hd__muc { gap: 12px; padding: 14px 0; }
    .qi-hd__huy { width: 54px; height: 54px; border-radius: 10px; }
    .qi-hd__huy b { font-size: 17px; }
    .qi-hd__huy span { font-size: 10.5px; }
    .qi-hd .qi-hd__tieu { font-size: 16px; }
    .qi-hd__luoi { grid-template-columns: minmax(0, 1fr); gap: 14px; }
    .qi-hd__cuoi { flex-direction: column-reverse; align-items: stretch; }
    .qi-hd__cuoi .qi-hd__nut { width: 100%; }
}