/* English Practice 360 — kiểu dùng chung (bảng màu đồng bộ Không gian Nhà trường / Tổ chuyên môn 360) */
:root {
  --navy: #12283f; --navy2: #1c3a5c; --vang: #e9b949; --vang-chu: #946f12; --vang-nhat: #fdf6e3;
  --nen: #f9fafb; --trang: #ffffff; --vien: #e5e7eb; --vien-dam: #d1d5db;
  --chu: #111827; --chu-nhat: #6b7280; --chu-mo: #9ca3af;
  --xanh: #15803d; --xanh-nhat: #ecfdf5; --do: #dc2626; --do-nhat: #fef2f2; --lam: #1e5aa8; --lam-nhat: #eff6ff;
  --cam: #d19a1e; --cam-nhat: #fffbeb; --bo: 8px; --bong: 0 1px 2px rgba(17, 24, 39, .06), 0 1px 3px rgba(17, 24, 39, .08);
  --font: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; font-family: var(--font); font-size: 15px; line-height: 1.5; color: var(--chu); background: var(--nen); }
a { color: var(--lam); }
h1, h2, h3, h4 { margin: 0 0 .5rem; line-height: 1.25; color: var(--navy); }
h1 { font-size: 1.5rem; } h2 { font-size: 1.2rem; } h3 { font-size: 1.05rem; }
p { margin: 0 0 .75rem; }
.mo { color: var(--chu-nhat); } .nho { font-size: .85rem; } .dam { font-weight: 600; } .phai { text-align: right; } .giua { text-align: center; }
.an { display: none !important; }
[hidden] { display: none !important; }

/* Đầu trang */
.dau { background: var(--navy); color: #fff; position: sticky; top: 0; z-index: 20; box-shadow: 0 2px 6px rgba(0,0,0,.25); }
.dau .trong { max-width: 1140px; margin: 0 auto; padding: .55rem 1rem; display: flex; align-items: center; gap: .9rem; flex-wrap: wrap; }
.dau .thuong-hieu { font-weight: 700; letter-spacing: .01em; display: flex; align-items: center; gap: .5rem; white-space: nowrap; }
.dau .thuong-hieu .cham { width: 10px; height: 10px; border-radius: 50%; background: var(--vang); display: inline-block; }
.dau .truong { color: #dbe4ee; font-size: .9rem; flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.dau .nguoi { display: flex; align-items: center; gap: .5rem; font-size: .9rem; }
.dau .nguoi .ten { color: #fff; font-weight: 600; }
.dau .nguoi .nut { padding: .3rem .7rem; font-size: .85rem; }
.nut.trang { background: transparent; color: #fff; border: 1px solid rgba(255,255,255,.4); }
.nut.trang:hover { background: rgba(255,255,255,.12); }

/* Thanh điều hướng (tab) */
.dieu-huong { background: var(--navy2); }
.dieu-huong .trong { max-width: 1140px; margin: 0 auto; padding: 0 .5rem; display: flex; gap: .15rem; overflow-x: auto; scrollbar-width: none; }
.dieu-huong .trong::-webkit-scrollbar { display: none; }
.dieu-huong button { background: transparent; border: 0; color: #cfd9e5; padding: .7rem .9rem; font: inherit; font-size: .92rem; cursor: pointer; white-space: nowrap; border-bottom: 3px solid transparent; }
.dieu-huong button:hover { color: #fff; }
.dieu-huong button.chon { color: #fff; border-bottom-color: var(--vang); font-weight: 600; }
.dieu-huong button .dem { background: var(--vang); color: var(--navy); border-radius: 999px; font-size: .72rem; padding: 0 .4rem; margin-left: .3rem; font-weight: 700; }

/* Bố cục */
main.trong, .trong-chinh { max-width: 1140px; margin: 0 auto; padding: 1.1rem 1rem 3rem; }
.hang { display: flex; gap: .75rem; flex-wrap: wrap; align-items: center; }
.hang.cach { justify-content: space-between; }
.luoi { display: grid; gap: .9rem; }
.luoi.c2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.luoi.c3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.luoi.c4 { grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); }
.the { background: var(--trang); border: 1px solid var(--vien); border-radius: var(--bo); box-shadow: var(--bong); padding: 1rem 1.1rem; }
.the > h2:first-child, .the > h3:first-child { margin-top: 0; }
.the.noi { border-left: 4px solid var(--vang); }
.chi-so { display: flex; flex-direction: column; gap: .15rem; }
.chi-so .so { font-size: 1.9rem; font-weight: 700; color: var(--navy); line-height: 1.1; }
.chi-so .nhan-cs { color: var(--chu-nhat); font-size: .88rem; }

/* Nút */
.nut { display: inline-flex; align-items: center; gap: .4rem; background: var(--navy); color: #fff; border: 1px solid var(--navy); border-radius: var(--bo); padding: .5rem .95rem; font: inherit; font-size: .92rem; font-weight: 600; cursor: pointer; text-decoration: none; line-height: 1.2; transition: filter .15s; }
.nut:hover { filter: brightness(1.15); }
.nut:disabled { opacity: .55; cursor: not-allowed; filter: none; }
.nut.phu { background: #fff; color: var(--navy); border-color: var(--vien-dam); font-weight: 500; }
.nut.phu:hover { background: var(--nen); filter: none; }
.nut.vang { background: var(--vang); color: var(--navy); border-color: var(--vang); }
.nut.nguy { background: #fff; color: var(--do); border-color: #fecaca; font-weight: 500; }
.nut.nguy:hover { background: var(--do-nhat); filter: none; }
.nut.nho { padding: .3rem .6rem; font-size: .82rem; }
.nut.lon { padding: .75rem 1.3rem; font-size: 1rem; }
.nut.rong { width: 100%; justify-content: center; }
.lien-ket { background: none; border: 0; color: var(--lam); cursor: pointer; font: inherit; padding: 0; text-decoration: underline; }

/* Biểu mẫu */
label.o { display: block; margin-bottom: .75rem; }
label.o.hang { display: flex; }
label.o > span, .nhan-o { display: block; font-size: .85rem; font-weight: 600; color: var(--chu-nhat); margin-bottom: .25rem; }
input[type=text], input[type=email], input[type=password], input[type=number], input[type=date], input[type=tel], select, textarea {
  width: 100%; padding: .55rem .7rem; border: 1px solid var(--vien-dam); border-radius: var(--bo); font: inherit; font-size: .95rem; background: #fff; color: var(--chu); }
input:focus, select:focus, textarea:focus { outline: 2px solid rgba(233, 185, 73, .55); outline-offset: 1px; border-color: var(--vang); }
input.pin { font-size: 1.6rem; letter-spacing: .35em; text-align: center; font-variant-numeric: tabular-nums; }
input.ma { text-transform: uppercase; letter-spacing: .08em; }
textarea { min-height: 90px; resize: vertical; }
.goi-y { font-size: .82rem; color: var(--chu-nhat); margin-top: .25rem; }
.loi { color: var(--do); font-size: .88rem; }
.hop-loi { background: var(--do-nhat); border: 1px solid #fecaca; color: #991b1b; border-radius: var(--bo); padding: .6rem .8rem; font-size: .9rem; }
.hop-tot { background: var(--xanh-nhat); border: 1px solid #a7f3d0; color: #065f46; border-radius: var(--bo); padding: .6rem .8rem; font-size: .9rem; }
.hop-chu-y { background: var(--cam-nhat); border: 1px solid #fde68a; color: #92400e; border-radius: var(--bo); padding: .6rem .8rem; font-size: .9rem; }
.hop-tin { background: var(--lam-nhat); border: 1px solid #bfdbfe; color: #1e3a8a; border-radius: var(--bo); padding: .6rem .8rem; font-size: .9rem; }
.chon-tep { border: 2px dashed var(--vien-dam); border-radius: var(--bo); padding: 1.2rem; text-align: center; color: var(--chu-nhat); cursor: pointer; background: #fff; }
.chon-tep:hover, .chon-tep.keo { border-color: var(--vang); background: var(--vang-nhat); }

/* Bảng */
.bang-cuon { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table.bang { width: 100%; border-collapse: collapse; font-size: .92rem; background: #fff; }
table.bang th, table.bang td { padding: .5rem .6rem; border-bottom: 1px solid var(--vien); text-align: left; vertical-align: top; }
table.bang th { background: #f3f4f6; color: var(--navy); font-weight: 600; font-size: .82rem; text-transform: uppercase; letter-spacing: .03em; white-space: nowrap; }
table.bang tr:hover td { background: #fafafa; }
/* Bảng bộ sách có 12 cột khối (m10): để tự co thì cột tên sách bị bóp còn một chữ
   mỗi dòng. Ghim bề rộng tối thiểu rồi cho .bang-cuon cuốn ngang thay vì bóp. */
#ct-sach table.bang { min-width: 56rem; }
#ct-sach table.bang td:first-child,
#ct-sach table.bang td:nth-child(2) { min-width: 9rem; }
#ct-sach table.bang td:last-child { min-width: 11rem; }
table.bang td.so, table.bang th.so { text-align: right; font-variant-numeric: tabular-nums; }
table.bang .hanh-dong { white-space: nowrap; }
table.bang tr.loi td { background: var(--do-nhat); }
table.bang tr.chu-y td { background: var(--cam-nhat); }

/* Nhãn trạng thái */
.nhan { display: inline-block; padding: .1rem .5rem; border-radius: 999px; font-size: .78rem; font-weight: 600; white-space: nowrap; background: #eef2f7; color: var(--navy2); }
.nhan.xanh { background: var(--xanh-nhat); color: var(--xanh); }
.nhan.do { background: var(--do-nhat); color: var(--do); }
.nhan.vang { background: var(--vang-nhat); color: var(--vang-chu); }
.nhan.lam { background: var(--lam-nhat); color: var(--lam); }
.nhan.xam { background: #f3f4f6; color: var(--chu-nhat); }

.nhan.vien { background: #fff; border: 1px solid var(--vien-dam); color: var(--chu-nhat); font-size: .74rem; }

/* Ngân hàng câu hỏi */
.loc { display: flex; flex-wrap: wrap; gap: .45rem; align-items: center; margin-top: .8rem; padding: .6rem; background: var(--nen); border: 1px solid var(--vien); border-radius: var(--bo); }
.loc select, .loc input[type=search] { width: auto; min-width: 120px; max-width: 260px; padding: .35rem .5rem; font-size: .88rem; }
.loc input[type=search] { flex: 1; min-width: 180px; }
.thanh-chon { margin-top: .7rem; padding: .5rem .7rem; background: var(--vang-nhat); border: 1px solid var(--vang); border-radius: var(--bo); display: flex; flex-wrap: wrap; gap: .4rem; align-items: center; font-size: .9rem; }
h3.tieu-nhom { margin: 1rem 0 .4rem; font-size: .95rem; text-transform: uppercase; letter-spacing: .04em; color: var(--chu-nhat); border-bottom: 1px solid var(--vien); padding-bottom: .3rem; }
.ma-nho { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .8rem; }
table.bang th.hep, table.bang td.hep { width: 28px; }
table.bang td.so.trong { color: var(--chu-mo); }
.the.con { background: var(--nen); border: 1px solid var(--vien); padding: .7rem .8rem; margin-bottom: .6rem; box-shadow: none; }
.the.con label.o { margin-bottom: .5rem; }
.the.con > .hang.cach { flex-wrap: nowrap; align-items: center; margin-bottom: .45rem; }
.the.con > .hang.cach select { width: auto; min-width: 132px; padding: .25rem .4rem; font-size: .85rem; }
.pa .pa-nd { font-size: .92rem; }
.ds-loi { margin: 0; padding-left: 1.1rem; font-size: .9rem; }

/* Xem thử như học sinh */
.xem-thu { background: var(--nen); border: 1px solid var(--vien); border-radius: var(--bo); padding: .9rem; }
.xem-thu .xt-doan { background: #fff; border-left: 4px solid var(--vang); padding: .7rem .9rem; border-radius: 0 var(--bo) var(--bo) 0; margin-bottom: .8rem; }
.xem-thu .xt-doan h4 { margin: 0 0 .35rem; }
.xem-thu .xt-cau { background: #fff; border: 1px solid var(--vien); border-radius: var(--bo); padding: .7rem .8rem; margin-bottom: .5rem; }
.xem-thu .xt-de { margin-bottom: .4rem; }
.xem-thu .xt-pa { display: grid; gap: .25rem; }
.xem-thu .xt-pa.hang { display: flex; gap: 1rem; }
.xem-thu .xt-pa label { font-size: .93rem; }
.xem-thu .xt-anh { margin: .3rem 0 .5rem; }

/* Ảnh minh hoạ câu hỏi */
.anh-ch { max-width: 100%; max-height: 260px; border: 1px solid var(--vien); border-radius: var(--bo); background: #fff; display: block; }
.anh-o .anh-xem { margin-top: .4rem; }
.anh-o .anh-tep { font-size: .88rem; }
.anh-o[hidden] { display: none; }

/* Ma trận đề (m05) */
.mt-o { background: #fff; border: 1px solid var(--vien); border-left: 3px solid var(--vang); border-radius: var(--bo); padding: .55rem .7rem; margin-bottom: .5rem; }
.mt-o .luoi { margin-bottom: .15rem; }
.mt-o label.o { margin-bottom: .35rem; }
.mt-o > .hang.cach { flex-wrap: wrap; gap: .4rem; }
.mt-o select.nho, .mt-o .o-nguon { width: auto; min-width: 120px; padding: .22rem .4rem; font-size: .85rem; }
.the.con > .hang.cach .nut.phu.nho { padding: .18rem .45rem; }
.do-chu { color: #b91c1c; }
.xanh-chu { color: #15803d; }

/* Tự luận & nghe */
.tc .tc-ten { min-width: 0; }
.phat-nghe { width: 100%; max-width: 460px; height: 36px; }
.xem-thu .xt-nghe { background: #fff; border: 1px solid var(--vien); border-left: 4px solid var(--navy); border-radius: 0 var(--bo) var(--bo) 0; padding: .65rem .8rem; margin-bottom: .8rem; }
.xem-thu .xt-loi-dan { font-style: italic; margin: .25rem 0 .45rem; }
.xem-thu .xt-goi-y { margin: .2rem 0 .4rem 1.1rem; font-size: .9rem; color: var(--chu-nhat); }
.xem-thu textarea { width: 100%; }

/* Trống */
.trong-rong { text-align: center; color: var(--chu-nhat); padding: 2rem 1rem; }
.trong-rong .to { font-size: 2rem; }
.trong-rong .nut { margin-top: .75rem; }

/* Hộp thoại */
dialog.hop { border: 0; border-radius: 12px; padding: 0; max-width: min(720px, 94vw); width: 100%; box-shadow: 0 20px 60px rgba(0,0,0,.35); }
dialog.hop.rong { max-width: min(1000px, 96vw); }
dialog.hop::backdrop { background: rgba(17, 24, 39, .55); }
dialog.hop .hop-dau { display: flex; justify-content: space-between; align-items: center; padding: .9rem 1.1rem; border-bottom: 1px solid var(--vien); background: var(--navy); color: #fff; border-radius: 12px 12px 0 0; }
dialog.hop .hop-dau h3 { margin: 0; color: #fff; font-size: 1.05rem; }
dialog.hop .dong { background: transparent; border: 0; color: #fff; font-size: 1.4rem; cursor: pointer; line-height: 1; padding: 0 .2rem; }
dialog.hop .hop-than { padding: 1rem 1.1rem; max-height: 72vh; overflow: auto; }
dialog.hop .hop-chan { display: flex; justify-content: flex-end; gap: .5rem; padding: .8rem 1.1rem; border-top: 1px solid var(--vien); background: var(--nen); border-radius: 0 0 12px 12px; flex-wrap: wrap; }

/* Thông báo nổi */
#thong-bao { position: fixed; bottom: 1rem; left: 50%; transform: translateX(-50%); z-index: 100; display: flex; flex-direction: column; gap: .4rem; width: min(480px, 92vw); }
#thong-bao .tb { background: var(--navy); color: #fff; padding: .6rem .9rem; border-radius: var(--bo); box-shadow: 0 6px 20px rgba(0,0,0,.25); font-size: .92rem; animation: hien .2s ease-out; }
#thong-bao .tb.tot { background: var(--xanh); } #thong-bao .tb.loi { background: var(--do); } #thong-bao .tb.chu-y { background: var(--cam); color: #1f2937; }
@keyframes hien { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* Mật khẩu tạm / PIN hiển thị một lần */
.ma-bi-mat { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 1.35rem; letter-spacing: .12em; background: var(--vang-nhat); border: 1px dashed var(--vang); padding: .5rem .9rem; border-radius: var(--bo); display: inline-block; user-select: all; }

/* Trang đăng nhập */
.dang-nhap-nen { min-height: 100vh; display: flex; flex-direction: column; background: linear-gradient(160deg, var(--navy) 0%, var(--navy2) 55%, #23496f 100%); }
.dang-nhap-hop { margin: auto; width: min(460px, 94vw); background: #fff; border-radius: 14px; box-shadow: 0 24px 60px rgba(0,0,0,.35); overflow: hidden; }
.dang-nhap-hop .dinh { padding: 1.3rem 1.4rem .9rem; text-align: center; }
.dang-nhap-hop .dinh h1 { font-size: 1.45rem; margin: .2rem 0 .1rem; }
.dang-nhap-hop .chuyen { display: flex; border-bottom: 1px solid var(--vien); }
.dang-nhap-hop .chuyen button { flex: 1; background: transparent; border: 0; padding: .8rem; font: inherit; font-weight: 600; color: var(--chu-nhat); cursor: pointer; border-bottom: 3px solid transparent; }
.dang-nhap-hop .chuyen button.chon { color: var(--navy); border-bottom-color: var(--vang); }
.dang-nhap-hop form, .dang-nhap-hop .phan { padding: 1.2rem 1.4rem 1.4rem; }
.dang-nhap-chan { text-align: center; color: #cfd9e5; font-size: .82rem; padding: 1rem; }
.dang-nhap-chan a { color: #fff; }

/* Học sinh — mobile-first */
.hs-dau { background: var(--navy); color: #fff; padding: .9rem 1rem; }
.hs-dau .xin-chao { font-size: 1.15rem; font-weight: 700; }
.hs-dau .lop { color: #dbe4ee; font-size: .9rem; }
.hs-trong { max-width: 640px; margin: 0 auto; padding: 1rem; }
.hs-thanh { position: fixed; bottom: 0; left: 0; right: 0; background: #fff; border-top: 1px solid var(--vien); display: flex; z-index: 30; padding-bottom: env(safe-area-inset-bottom); }
.hs-thanh button { flex: 1; background: transparent; border: 0; padding: .55rem 0 .45rem; font: inherit; font-size: .78rem; color: var(--chu-nhat); cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: .1rem; }
.hs-thanh button .bt { font-size: 1.25rem; }
.hs-thanh button.chon { color: var(--navy); font-weight: 700; }
body.hs { padding-bottom: 64px; }

/* In */
@media print { .dau, .dieu-huong, .hs-thanh, .khong-in { display: none !important; } body { background: #fff; } .the { box-shadow: none; } }
@media (max-width: 640px) {
  main.trong, .trong-chinh { padding: .8rem .7rem 3rem; }
  .the { padding: .85rem .9rem; }
  dialog.hop .hop-than { max-height: 70vh; }
  .dau .truong { display: none; }
}

/* Cây kiến thức (Quản trị → Chương trình) */
.cay-nhanh { margin-bottom: .8rem; }
.cay-goc { font-weight: 700; color: var(--navy); border-bottom: 1px solid var(--vien); padding-bottom: .2rem; margin-bottom: .35rem; }
.cay-cd { margin: 0 0 .5rem .3rem; }
.cay-la { display: flex; flex-wrap: wrap; gap: .3rem; margin-top: .25rem; }
.vien-la { display: inline-block; border: 1px solid var(--vien-dam); background: #fff; border-radius: 999px; padding: .1rem .55rem; font-size: .82rem; }
.vien-la.rieng { border-color: var(--vang); background: var(--vang-nhat); color: var(--vang-chu); }

/* ===================================================================
   PHIÊN QR (giáo viên) — m06/m07
   =================================================================== */
.ma-phien { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .18em; font-weight: 700; }
.ma-phien.to { font-size: 2.1rem; letter-spacing: .22em; color: var(--navy); margin: .2rem 0 .5rem; }
.qr-nho { max-width: 180px; margin: 0 auto; }
.qr-nho svg { display: block; width: 100%; height: auto; }
/* Theo dõi phiên: cột QR hẹp cố định bên trái, chỉ số + bảng lớp chiếm phần còn lại */
.ph-theo-doi { display: grid; grid-template-columns: 320px minmax(0, 1fr); gap: .9rem; align-items: start; }
.ph-theo-doi .luoi.cs4 { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .6rem; }
@media (max-width: 1080px) { .ph-theo-doi .luoi.cs4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 820px) { .ph-theo-doi { grid-template-columns: 1fr; } }
.qr-thay { border: 1px dashed var(--vien-dam); border-radius: var(--bo); padding: .7rem; text-align: center; }
.qr-thay-nhan { font-size: .78rem; color: var(--chu-nhat); }
.qr-thay-ma { font-family: ui-monospace, monospace; font-size: 1.4rem; letter-spacing: .2em; font-weight: 700; }

.qr-toan { position: fixed; inset: 0; background: var(--navy); color: #fff; z-index: 200; display: flex; align-items: center; justify-content: center; }
.qr-toan .qr-dong { position: absolute; top: 1rem; right: 1rem; background: transparent; border: 1px solid rgba(255,255,255,.4); color: #fff; border-radius: 999px; width: 2.4rem; height: 2.4rem; font-size: 1.2rem; cursor: pointer; }
.qr-hop { text-align: center; max-width: min(90vw, 70vh); }
.qr-ten { font-size: 1.4rem; font-weight: 700; margin-bottom: 1rem; }
.qr-anh { background: #fff; padding: 1.2rem; border-radius: 12px; }
.qr-anh svg { display: block; width: 100%; height: auto; }
.qr-ma { font-family: ui-monospace, monospace; font-size: clamp(2rem, 8vw, 4rem); letter-spacing: .2em; font-weight: 700; margin-top: 1rem; color: var(--vang); }
.qr-huong-dan { color: #dbe4ee; font-size: .95rem; margin-top: .6rem; }

.tab-phu { display: flex; gap: .3rem; border-bottom: 1px solid var(--vien); flex-wrap: wrap; }
.tab-phu button { background: transparent; border: 0; border-bottom: 2px solid transparent; padding: .45rem .7rem; font: inherit; font-size: .9rem; color: var(--chu-nhat); cursor: pointer; }
.tab-phu button.chon { color: var(--navy); font-weight: 700; border-bottom-color: var(--vang); }

.thanh-ti-le { position: relative; background: #eef2f7; border-radius: 999px; height: 1.15rem; min-width: 90px; overflow: hidden; }
.thanh-ti-le .thanh { position: absolute; inset: 0 auto 0 0; border-radius: 999px; }
.thanh-ti-le .thanh.xanh { background: var(--xanh); } .thanh-ti-le .thanh.vang { background: var(--vang); } .thanh-ti-le .thanh.do { background: var(--do); }
.thanh-ti-le span { position: relative; display: block; text-align: center; font-size: .72rem; font-weight: 700; line-height: 1.15rem; color: var(--navy2); }
tr.dong-canh-bao > td { background: var(--do-nhat); }

.bai-tu-luan { margin-top: .7rem; }
.bai-tu-luan.da-cham { opacity: .78; }
.bai-tu-luan .bai-lam { background: #f9fafb; border: 1px solid var(--vien); border-radius: var(--bo); padding: .6rem .7rem; margin-top: .4rem; white-space: pre-wrap; }
.hop-chon { display: flex; flex-wrap: wrap; gap: .4rem; }
.chon-o { border: 1px solid var(--vien-dam); border-radius: 999px; padding: .25rem .7rem; font-size: .88rem; cursor: pointer; }

/* ===================================================================
   MÀN LÀM BÀI (học sinh)
   =================================================================== */
.man-bai { position: fixed; inset: 0; background: var(--nen); display: flex; flex-direction: column; z-index: 100; }
.bai-dau { background: var(--navy); color: #fff; padding: .6rem .9rem; display: flex; align-items: center; justify-content: space-between; gap: .6rem; }
.bai-ten { font-weight: 700; font-size: .98rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.dong-ho { font-family: ui-monospace, monospace; font-size: 1.25rem; font-weight: 700; font-variant-numeric: tabular-nums; background: rgba(255,255,255,.12); padding: .15rem .55rem; border-radius: 999px; }
.dong-ho.gap { background: var(--vang); color: var(--navy); }
.dong-ho.rat-gap { background: var(--do); color: #fff; animation: nhapnhay 1s steps(2, start) infinite; }
@keyframes nhapnhay { 50% { opacity: .55; } }
.bai-tien-do { height: 4px; background: #e5e7eb; }
.bai-tien-do .thanh { height: 100%; background: var(--xanh); width: 0; transition: width .25s; }
.bai-than { flex: 1; overflow-y: auto; padding: .8rem; max-width: 680px; width: 100%; margin: 0 auto; }
.bai-chan { border-top: 1px solid var(--vien); background: #fff; padding: .6rem .9rem calc(.6rem + env(safe-area-inset-bottom)); display: flex; align-items: center; justify-content: space-between; gap: .8rem; }

.bai-phan { font-weight: 700; color: var(--navy); margin: 1rem 0 .4rem; padding-bottom: .25rem; border-bottom: 2px solid var(--vang); }
.bai-phan:first-child { margin-top: 0; }
.bai-khoi { background: #fff; border: 1px solid var(--vien); border-left: 4px solid var(--navy2); border-radius: var(--bo); padding: .7rem .8rem; margin-bottom: .6rem; }
.bai-khoi .khoi-ten { font-weight: 700; }
.bai-khoi .khoi-loi-dan { font-style: italic; color: var(--chu-nhat); font-size: .9rem; margin-top: .2rem; }
.bai-khoi .khoi-doan { margin-top: .5rem; line-height: 1.65; }
.bai-khoi .khoi-nghe { margin-top: .5rem; }
.bai-khoi .phat-nghe { width: 100%; }

.bai-cau { background: #fff; border: 1px solid var(--vien); border-radius: var(--bo); padding: .7rem .8rem; margin-bottom: .6rem; }
.bai-cau.da-lam { border-left: 4px solid var(--xanh); }
.cau-dau { display: flex; align-items: center; gap: .45rem; margin-bottom: .35rem; }
.cau-so { background: var(--navy); color: #fff; border-radius: 999px; min-width: 1.7rem; height: 1.7rem; display: inline-flex; align-items: center; justify-content: center; font-weight: 700; font-size: .9rem; }
.cau-diem { font-size: .78rem; color: var(--chu-nhat); }
.cau-de { line-height: 1.6; }
.cau-anh-boc { margin: .5rem 0; }
.cau-anh-boc .anh-ch { max-width: 100%; border-radius: var(--bo); }

.pa-ds { display: flex; flex-direction: column; gap: .35rem; margin-top: .5rem; }
.pa-ds.ngang { flex-direction: row; flex-wrap: wrap; }
.pa { display: flex; align-items: flex-start; gap: .5rem; border: 1px solid var(--vien-dam); border-radius: var(--bo); padding: .55rem .6rem; cursor: pointer; line-height: 1.45; }
.pa:has(input:checked) { border-color: var(--navy); background: #eef2f7; }
.pa input { margin-top: .2rem; }
.pa-nhan { font-weight: 700; color: var(--navy); min-width: 1.1rem; }
.o-dien, .o-viet { width: 100%; margin-top: .5rem; }
.goi-y-ds { margin: .4rem 0 0; padding-left: 1.1rem; font-size: .9rem; color: var(--chu-nhat); }
.dem-tu { text-align: right; }

.viec-bai { margin-top: .6rem; }
.kq-chua { text-align: center; padding: .5rem 0; }
.kq-chua .to { font-size: 2.4rem; }
.kq-diem { text-align: center; background: var(--nen); border-radius: var(--bo); padding: .9rem; }
.kq-so { font-size: 3rem; font-weight: 800; color: var(--navy); line-height: 1; }
.kq-so .kq-tren { font-size: 1.2rem; color: var(--chu-nhat); font-weight: 600; }
.kq-chi-tiet { display: flex; gap: .35rem; justify-content: center; flex-wrap: wrap; margin-top: .5rem; }
.kq-kt-dong { display: grid; grid-template-columns: 1fr 130px; gap: .5rem; align-items: center; margin-top: .3rem; }
.kq-kt-ten { font-size: .9rem; }
.kq-mot-cau { border: 1px solid var(--vien); border-left-width: 4px; border-radius: var(--bo); padding: .55rem .65rem; margin-top: .45rem; }
.kq-mot-cau.dung { border-left-color: var(--xanh); }
.kq-mot-cau.sai { border-left-color: var(--do); }
.kq-mot-cau.trong { border-left-color: var(--vien-dam); }
.kq-mot-cau.cho { border-left-color: var(--vang); }
.kq-nhan-xet { margin-top: .4rem; background: var(--vang-nhat); border-radius: var(--bo); padding: .4rem .55rem; font-size: .88rem; }
.kq-giai-thich { margin-top: .35rem; background: var(--lam-nhat); border-radius: var(--bo); padding: .4rem .55rem; font-size: .88rem; }

@media (max-width: 560px) {
  .kq-kt-dong { grid-template-columns: 1fr 90px; }
  .bai-ten { font-size: .9rem; }
}

/* ---- S5: luyện điểm yếu và sổ câu sai ---- */
/* Trong thẻ "Em mạnh yếu ở đâu" của tab Luyện, cột phải còn có nút Luyện nên
   không nhét vừa ô 130px của .kq-kt-dong — xếp thành hai dòng cho máy điện thoại. */
.kq-kt.luyen-kt .kq-kt-dong { grid-template-columns: 1fr; gap: .25rem; margin-top: .6rem; }
.luyen-cs { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .5rem; }
@media (max-width: 520px) { .luyen-cs { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.luyen-o { background: var(--nen); border: 1px solid var(--vien); border-radius: var(--bo); padding: .5rem .6rem; text-align: center; }
.luyen-o .so { font-size: 1.5rem; font-weight: 700; color: var(--navy); line-height: 1.1; }
.luyen-o .nhan-cs { color: var(--chu-nhat); font-size: .76rem; }
.so-cau-sai { border: 1px solid var(--vien); border-radius: var(--bo); padding: .6rem .7rem; margin-bottom: .5rem; background: #fff; }
.so-cau-sai:last-child { margin-bottom: 0; }
/* nhóm cần hỗ trợ (màn giáo viên) */
.nhom-chon { display: flex; align-items: center; gap: .4rem; }
tr.dong-chon td { background: var(--vang-nhat); }

/* ---- S6: Báo cáo & tiến bộ ---- */
.bc-do { width: 100%; height: auto; max-width: 660px; display: block; }
.bc-do text { font-family: inherit; }
table.bang td .nut.nho { white-space: nowrap; }   /* nút "Hồ sơ" không được xuống dòng */
.chi-in { display: none; }                        /* chỉ hiện khi in ra giấy */

/* Bản in khổ A4: bỏ thanh điều hướng và mọi nút, để bảng chiếm trọn trang giấy */
@media print {
  @page { size: A4 portrait; margin: 1.4cm; }
  .khong-in, .dieu-huong, .dau, .hs-thanh, #thong-bao { display: none !important; }
  .chi-in { display: block !important; margin-bottom: .6rem; }
  .bc-dau-in .ten-truong { font-weight: 700; color: var(--navy); font-size: 1.05rem; }
  body { background: #fff; }
  main.trong, .trong, .trong-chinh { max-width: none; padding: 0; margin: 0; }
  .the { box-shadow: none; border: 0; padding: 0 0 .6rem; page-break-inside: auto; }
  .the + .the, .luoi { margin-top: .5rem !important; }
  .luoi.c2 { display: block; }
  .luoi.c2 > .the { margin-top: .6rem; }
  .bang-cuon { overflow: visible !important; }
  table.bang { page-break-inside: auto; font-size: 10.5pt; }
  table.bang tr { page-break-inside: avoid; page-break-after: auto; }
  table.bang thead { display: table-header-group; }
  h2, h3 { page-break-after: avoid; }
  .nhan { border: 1px solid #999; background: #fff !important; color: #000 !important; }
}