/* Giao dien chung cho ca 3 trang cua Unit 2 Online */
:root{
  /* Tong mau chu dao: HONG PHAN NHE */
  --xanh:#c04a7a;        /* mau nhan chinh (nut, vien o da chon) */
  --xanh-nhat:#ffe3ef;   /* hong phan rat nhat - nen o da chon */
  --xanh-dam:#8f3358;    /* hong dam - chu nhan manh */
  --hong-dinh-1:#ffd9e8; /* dau trang: hong phan */
  --hong-dinh-2:#ffc7dd;
  --vang:#f59e0b; --do:#dc2626; --luc:#16a34a;
  --nen:#fff6fa; --the:#ffffff; --chu:#3b2b33; --chu-mo:#8a7480;
  --vien:#f6dfe8; --bo-goc:16px;
  --bong:0 1px 2px rgba(143,51,88,.06), 0 8px 24px rgba(143,51,88,.10);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:"Segoe UI",system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;
  background:var(--nen); color:var(--chu); line-height:1.6;
  -webkit-text-size-adjust:100%;
}
.boc{max-width:820px;margin:0 auto;padding:16px}
.boc-rong{max-width:1180px;margin:0 auto;padding:16px}

.dinh{
  background:linear-gradient(135deg,var(--hong-dinh-1),var(--hong-dinh-2));
  color:var(--xanh-dam);
  padding:22px 16px; text-align:center;
}
.dinh h1{margin:0;font-size:24px;letter-spacing:.2px}
.dinh p{margin:6px 0 0;opacity:.85;font-size:15px}

.the{
  background:var(--the); border:1px solid var(--vien); border-radius:var(--bo-goc);
  padding:18px; box-shadow:var(--bong); margin-bottom:16px;
}

label{display:block;font-weight:600;margin:14px 0 6px;font-size:15px}
input[type=text],input[type=password],select{
  width:100%;padding:13px 14px;font-size:17px;border:2px solid var(--vien);
  border-radius:12px;background:#fff;color:var(--chu);font-family:inherit;
}
input:focus,select:focus{outline:none;border-color:var(--xanh)}

.nut{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:14px 20px;font-size:17px;font-weight:700;border:none;border-radius:12px;
  background:var(--xanh);color:#fff;cursor:pointer;font-family:inherit;
  transition:transform .08s ease, filter .15s ease;
}
.nut:hover{filter:brightness(1.07)}
.nut:active{transform:scale(.98)}
.nut[disabled]{opacity:.55;cursor:not-allowed}
.nut-to{width:100%;padding:16px;font-size:18px}
.nut-phu{background:#fff;color:var(--xanh-dam);border:2px solid var(--xanh)}
.nut-xam{background:#f3e3ea;color:#6b4a58}
.nut-do{background:var(--do)}
.nut-nho{padding:8px 14px;font-size:14px;border-radius:10px}

.tab{display:flex;gap:8px;margin-bottom:6px}
.tab button{
  flex:1;padding:13px 10px;font-size:16px;font-weight:700;cursor:pointer;
  border:2px solid var(--vien);background:#fff;color:var(--chu-mo);
  border-radius:12px;font-family:inherit;
}
.tab button.chon{background:var(--xanh-nhat);border-color:var(--xanh);color:var(--xanh-dam)}

.bao{padding:12px 14px;border-radius:12px;font-weight:600;margin-top:12px;display:none}
.bao.hien{display:block}
.bao-loi{background:#fee2e2;color:#991b1b}
.bao-ok{background:#dcfce7;color:#166534}

.mo{color:var(--chu-mo);font-size:14px}
.giua{text-align:center}

/* Logo va ten web HUEVERSE */
.anh-logo{
  width:74px;height:74px;border-radius:50%;object-fit:cover;display:block;
  margin:0 auto 10px;border:3px solid #fff;
  box-shadow:0 6px 18px rgba(143,51,88,.25);
}
.anh-logo.to{width:96px;height:96px}
.ten-web{
  font-weight:800;letter-spacing:4px;text-transform:uppercase;
  text-shadow:0 2px 8px rgba(143,51,88,.14);
}

/* ---------- Noi dung dung chung cua de (bai doc, file nghe, hinh, video) + cac kieu cau moi ---------- */
.doan.khoi h3{margin:0 0 8px;font-size:16px;color:#8f3358}
.doan.khoi p{margin:8px 0 0;white-space:pre-line;font-size:16px}
.may-nghe{display:block;width:100%;margin:6px 0}
.khung-video{position:relative;width:100%;aspect-ratio:16/9;margin:8px 0;border-radius:12px;overflow:hidden;background:#000}
.khung-video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.anh-khoi,.anh-cau{display:block;max-width:100%;max-height:420px;border-radius:12px;margin:8px auto;border:1px solid var(--vien);background:#fff}
.anh-cau{max-height:300px;margin:0 0 12px}
.nhan-loai{display:inline-block;font-size:12px;font-weight:800;padding:2px 9px;border-radius:99px;
           background:#eef2ff;color:#3730a3;margin-left:6px;vertical-align:middle;white-space:nowrap}
.o-dien{width:100%;padding:12px 14px;font-size:17px;border:2px solid var(--vien);border-radius:12px;
        font-family:inherit;color:var(--chu);background:#fff}
.o-dien:focus{outline:none;border-color:var(--xanh)}
.o-dien.co{border-color:var(--xanh);background:var(--xanh-nhat)}
.sx-dong{min-height:54px;padding:8px;border:2px dashed var(--vien);border-radius:12px;background:#fff;
         display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.sx-dong.co{border-style:solid;border-color:var(--xanh);background:var(--xanh-nhat)}
.sx-dong .goi-y{color:var(--chu-mo);font-size:14px;padding:0 6px}
.sx-kho{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.sx-tu{padding:9px 14px;font-size:16px;font-family:inherit;font-weight:600;cursor:pointer;color:var(--chu);
       border:2px solid var(--vien);border-radius:10px;background:#fff;box-shadow:0 2px 0 var(--vien)}
.sx-tu:hover{border-color:#e9a9c4}
.sx-dong .sx-tu{border-color:var(--xanh);box-shadow:0 2px 0 #e9a9c4}
.sx-tu.da{visibility:hidden}
.noi-hang{display:flex;gap:10px;align-items:center;margin-bottom:8px;flex-wrap:wrap}
.noi-hang .trai{flex:1;min-width:120px;padding:10px 12px;border:2px solid var(--vien);border-radius:12px;background:#fff6fa;font-weight:600}
.noi-hang select{flex:1;min-width:140px;width:auto}
.noi-hang select.co{border-color:var(--xanh);background:var(--xanh-nhat)}
/* kiểu câu mới (06/10/2026): kho từ của điền từ bằng lựa chọn, khuôn số ký tự, sắp xếp câu */
.kho-tu{display:flex;flex-wrap:wrap;gap:8px;margin:2px 0 12px}
.kho-tu span{padding:6px 12px;border:2px dashed var(--vien);border-radius:999px;background:#fff;font-weight:600;font-size:15px}
.khuon-kt{font-family:ui-monospace,Consolas,monospace;font-size:20px;letter-spacing:2px;color:var(--chu-mo);margin:0 0 8px;word-break:break-all}
.sx-cau .sx-kho{flex-direction:column;align-items:stretch}
.sx-cau .sx-tu,.sx-cau .sx-dong .sx-tu{display:block;text-align:left;border-radius:12px}
.sx-cau .sx-dong{flex-direction:column;align-items:stretch}
.lua button .o-tick{flex:none;width:20px;height:20px;border:2px solid var(--chu-mo);border-radius:5px;margin-top:3px;
                    display:inline-flex;align-items:center;justify-content:center;font-size:14px;line-height:1;color:#fff}
.lua button.chon .o-tick{background:var(--xanh);border-color:var(--xanh)}
@media print{ .may-nghe,.khung-video,.sx-kho{display:none !important} }

/* ===== BANG DIEM CUA DE (11/10/2026): tong diem ca de + diem tung phan (HVCau.veBangDiem) ===== */
.bang-diem{background:#fffbeb;border:1px solid #fde68a;border-radius:14px;padding:12px 14px;margin:0 0 12px;color:#5b3a0a;font-size:15px}
.bang-diem .bd-dau{font-weight:800;color:#92400e;font-size:16px;margin-bottom:8px}
.bang-diem .bd-hang{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:4px 10px;padding:7px 0;border-top:1px dashed #fde68a}
.bang-diem .bd-hang.bd-tong{border-top:0;padding-top:0}
.bang-diem .bd-tong .bd-ten{font-weight:800;color:#92400e}
.bang-diem .bd-ten{min-width:0;font-weight:600}
.bang-diem label.bd-ten{margin:0;display:block;font-size:15px}
.bang-diem .bd-ten small{font-weight:500;color:#a16207;margin-left:4px;white-space:nowrap}
.bang-diem .bd-nhap{white-space:nowrap}
.bang-diem input.bd-o{width:84px;padding:6px 8px;font-size:16px;text-align:right;border:2px solid #fcd34d;border-radius:9px;background:#fff;margin:0 4px 0 0}
.bang-diem input.bd-o:focus{border-color:var(--xanh);outline:none}
.bang-diem input.bd-o::placeholder{color:#b8a27a}
.bang-diem .bd-tong input.bd-o{font-weight:800;color:var(--xanh-dam)}
.bang-diem .bd-moi{grid-column:1 / -1;font-size:13px;color:#a16207}
.bang-diem .bd-nut{border:1.5px solid #fcd34d;background:#fff;color:#92400e;border-radius:99px;padding:5px 11px;font:inherit;font-size:13.5px;font-weight:700;cursor:pointer}
.bang-diem .bd-nut:hover{background:#fef3c7}
.bang-diem .bd-tieu{margin:8px 0 2px;font-weight:700;color:#92400e}
.bang-diem .bd-tieu span{font-weight:500;font-size:13px;color:#a16207}
.bang-diem .bd-ket{margin-top:8px;color:#166534;font-weight:600}
.bang-diem .bd-loi{margin-top:8px;color:#b91c1c;font-weight:700}
.bang-diem .bd-ghi{margin-top:6px;font-size:13px;color:#a16207}
@media (min-width:620px){
  .bang-diem .bd-hang{grid-template-columns:minmax(0,1fr) auto 190px}
  .bang-diem .bd-moi{grid-column:auto}
}