/* ĐỐ VUI TRỰC TIẾP — mọi lớp tiền tố dv- (file này nạp ở mọi trang). Màu 4 đáp án đủ tương phản với chữ, kèm hình ▲◆●■ để không chỉ dựa vào màu. */
.dv-mau-0 { background: #c62828; color: #fff; }
.dv-mau-1 { background: #1565c0; color: #fff; }
.dv-mau-2 { background: #f2b705; color: #1d2a2c; }
.dv-mau-3 { background: #2e7d32; color: #fff; }
.dv-hinh { flex: none; display: inline-block; vertical-align: middle; }
.dv-o--mo { opacity: .38; }
.dv-lk-nho { font-weight: 600 !important; }

/* Danh sách bộ */
.dv-ds-bo { display: grid; gap: 12px; margin-bottom: 14px; }
@media (min-width: 720px) { .dv-ds-bo { grid-template-columns: 1fr 1fr; } }
.dv-bo { margin: 0; display: flex; flex-direction: column; }
.dv-bo__ten { font-size: 1.1rem; margin-bottom: 2px; }
.dv-bo__ten a { color: var(--chu); text-decoration: none; }
.dv-bo__ten a:hover { color: var(--c-dam); }
.dv-bo .hang-nut { margin-top: auto; }

/* Soạn */
.dv-cau { border: 1px solid var(--vien); min-width: 0; }
.dv-cau--loi { border-color: var(--do); box-shadow: 0 0 0 2px var(--do-nhat); }
.dv-cau__so { font-weight: 800; color: var(--c-dam); padding: 0 6px; font-size: 1.05rem; }
.dv-cau .field { margin-bottom: 12px; }
.dv-cau__hang { display: grid; gap: 0 10px; grid-template-columns: 1fr 1fr; }
.dv-cau__hang .field:first-child { grid-column: 1 / -1; }
@media (min-width: 640px) { .dv-cau__hang { grid-template-columns: 1.3fr 1fr 1.3fr; } .dv-cau__hang .field:first-child { grid-column: auto; } }
.dv-da { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.dv-da__nhan { flex: none; display: inline-flex; align-items: center; gap: 4px; min-width: 52px; height: 44px; padding: 0 8px; border-radius: var(--r-nho); font-weight: 800; }
.dv-da input[type=text] { flex: 1; min-width: 0; min-height: 44px; padding: 8px 10px; border: 1px solid #cfd6d1; border-radius: var(--r-nho); font: inherit; }
.dv-da input[type=text]:focus { border-color: var(--c); outline: 3px solid var(--c-nhat); }
.dv-da__dung { flex: none; display: inline-flex; align-items: center; gap: 6px; font-weight: 600; font-size: .9375rem; cursor: pointer; }
.dv-da__dung input, .dv-ds__o input { width: 20px; height: 20px; accent-color: var(--xanh-la); }
.dv-ds { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 12px; }
.dv-ds__h { width: 100%; margin: 0; font-weight: 600; font-size: .9375rem; }
.dv-ds__o { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 6px 16px; border-radius: 999px; font-weight: 700; cursor: pointer; }
/* Dạng câu: chỉ hiện phần nhập tương ứng (không cần JS) */
.dv-cau:has(.dv-loai option[value="dung_sai"]:checked) .dv-chon { display: none; }
.dv-cau:has(.dv-loai option[value="chon"]:checked) .dv-ds { display: none; }
.dv-cau__nut { justify-content: flex-end; border-top: 1px solid var(--vien); padding-top: 12px; }
.dv-soan__cuoi { margin: 6px 0 10px; }

/* Máy giáo viên */
.dv-moi { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
.dv-moi__chu { flex: 1 1 260px; min-width: 0; }
.dv-moi__ma { font-size: clamp(2.6rem, 11vw, 3.6rem); font-weight: 900; letter-spacing: .14em; color: var(--c-dam); font-variant-numeric: tabular-nums; line-height: 1.2; margin: 4px 0 8px; }
.dv-qr { flex: none; width: 150px; background: #fff; border-radius: var(--r-nho); line-height: 0; }
.dv-qr svg { width: 100%; height: auto; display: block; }
.dv-dk__cau { font-size: 1.15rem; font-weight: 700; }
.dv-dk__dem { margin-bottom: 6px; }
.dv-dk__da { display: grid; gap: 8px; margin: 12px 0; }
@media (min-width: 640px) { .dv-dk__da { grid-template-columns: 1fr 1fr; } }
.dv-dk .hang-nut { margin-top: 8px; }
.dv-o { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: var(--r-nho); font-weight: 700; min-width: 0; }
.dv-o__chu { flex: 1; min-width: 0; overflow-wrap: anywhere; }
.dv-o__dung { flex: none; display: inline-flex; align-items: center; gap: 4px; background: rgba(255,255,255,.92); color: #14532d; border-radius: 999px; padding: 2px 10px; font-size: .875rem; }
.dv-o__so { flex: none; min-width: 34px; text-align: center; background: rgba(0,0,0,.22); border-radius: 999px; padding: 1px 8px; font-variant-numeric: tabular-nums; }
.dv-mau-2 .dv-o__so { background: rgba(0,0,0,.12); }
.dv-ds-hs .ds__muc { align-items: center; }
.dv-ds-hs__hang { flex: none; width: 28px; text-align: center; font-weight: 800; color: var(--phu); }
.dv-bao-loi { position: fixed; left: 50%; bottom: 20px; transform: translateX(-50%); z-index: 60; max-width: calc(100% - 32px); margin: 0;
  background: #2b2f2e; color: #fff; padding: 12px 18px; border-radius: var(--r-nho); box-shadow: var(--bong); font-weight: 600; }

/* Kết quả */
.dv-bang-cuon { overflow-x: auto; }
.dv-bang { width: 100%; border-collapse: collapse; font-size: .9375rem; }
.dv-bang th, .dv-bang td { padding: 9px 8px; border-bottom: 1px solid var(--vien); text-align: left; }
.dv-bang th { font-size: .8125rem; color: var(--phu); }
.dv-bang .so { text-align: right; font-variant-numeric: tabular-nums; }
.dv-kq-cau { margin: 0; padding-left: 1.4em; }
.dv-kq-cau li { padding: 10px 0; border-bottom: 1px solid var(--vien); }
.dv-kq-cau li:last-child { border-bottom: 0; }
.dv-kq-cau__nd { font-weight: 700; margin-bottom: 2px; }
.dv-kq-cau .phu { margin-bottom: 6px; }
.dv-kq-cau__tl { display: grid; grid-template-columns: minmax(80px, 200px) 1fr; gap: 10px; align-items: center; }
.dv-kq-cau__tl .thanh-tien > span { background: var(--xanh-la); }

/* ══ Học sinh ══ */
.dv-vao h1 { margin-bottom: 12px; }
.dv-hs__dau { display: flex; justify-content: space-between; align-items: center; gap: 10px; background: var(--the); border: 1px solid var(--vien);
  border-radius: var(--r); padding: 10px 14px; margin-bottom: 12px; font-weight: 700; }
.dv-hs__ten { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.dv-hs__diem { flex: none; color: var(--c-dam); font-variant-numeric: tabular-nums; }
.dv-hs__thanh { display: flex; justify-content: space-between; align-items: center; font-weight: 700; margin-bottom: 10px; }
.dv-hs__dem { background: var(--c-dam); color: #fff; border-radius: 999px; padding: 4px 14px; font-variant-numeric: tabular-nums; }
.dv-hs__cau { font-size: 1.2rem; font-weight: 700; background: var(--the); border: 1px solid var(--vien); border-radius: var(--r); padding: 12px 14px; }
.dv-hs__o { text-align: center; background: var(--the); border: 1px solid var(--vien); border-radius: var(--r); padding: 32px 18px; }
.dv-lon { font-size: 1.7rem; font-weight: 900; margin-bottom: 6px; color: var(--c-dam); }
.dv-nut-luoi { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.dv-nut { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px; min-height: 150px; border: 0; border-radius: var(--r);
  font: inherit; font-weight: 900; font-size: 1.6rem; cursor: pointer; padding: 12px; box-shadow: 0 4px 0 rgba(0,0,0,.22); touch-action: manipulation; }
.dv-nut:active { transform: translateY(2px); box-shadow: 0 2px 0 rgba(0,0,0,.22); }
.dv-nut:disabled { opacity: .5; cursor: default; }
.dv-nut.dv-nut--chon { opacity: 1; outline: 4px solid var(--chu); outline-offset: 2px; }
.dv-nut__chu { font-size: 1rem; font-weight: 700; line-height: 1.3; overflow-wrap: anywhere; }
.dv-nut-luoi--chu .dv-nut { min-height: 120px; }
@media (max-height: 640px) { .dv-nut { min-height: 110px; } }
.dv-o-hinh { display: inline-flex; align-items: center; gap: 8px; padding: 12px 20px; border-radius: var(--r); font-size: 1.6rem; font-weight: 900; margin-bottom: 12px; }
.dv-kq--dung { background: var(--xanh-la-nhat); border-color: #bfe2c9; }
.dv-kq--dung .dv-lon { color: var(--xanh-la); }
.dv-kq--sai { background: var(--do-nhat); border-color: #f1c2bc; }
.dv-kq--sai .dv-lon { color: var(--do); }
.dv-kq__diem { font-size: 1.4rem; font-weight: 800; color: var(--xanh-la); }
.dv-kq__hang { font-size: 1.15rem; }
.dv-kq__hang b { font-size: 1.6rem; color: var(--c-dam); }
.dv-chu-dung { display: inline-flex; align-items: center; gap: 3px; padding: 1px 8px; border-radius: 6px; font-weight: 800; }
.dv-cho-cham { display: flex; justify-content: center; gap: 8px; margin-top: 14px; }
.dv-cho-cham i { width: 12px; height: 12px; border-radius: 50%; background: var(--c); animation: dv-nhay 1.2s infinite ease-in-out; }
.dv-cho-cham i:nth-child(2) { animation-delay: .2s; } .dv-cho-cham i:nth-child(3) { animation-delay: .4s; }
@keyframes dv-nhay { 0%, 80%, 100% { opacity: .25; transform: scale(.8); } 40% { opacity: 1; transform: scale(1); } }

/* ══ Màn chiếu (ưu tiên 1280–1920px) ══ */
.dv-chieu { min-height: calc(100vh - 48px); display: flex; flex-direction: column; padding-bottom: 52px; }
.dv-chieu .dv-ve { flex: 1; display: flex; flex-direction: column; }
.dv-c-nho { font-size: clamp(1.1rem, 1.8vw, 1.8rem); margin: 0; color: #dbe6f5; }
.dv-c-nho b { color: #fff; }
.dv-c-giua { text-align: center; }
.dv-c-cho { display: flex; align-items: center; justify-content: center; gap: clamp(24px, 5vw, 80px); flex-wrap: wrap; padding: 2vh 0; }
.dv-c-cho__chu { text-align: center; }
.dv-c-ma { font-size: clamp(4rem, 11vw, 10rem); line-height: 1.1; margin: 8px 0; }
.dv-qr--to { width: clamp(200px, 22vw, 380px); padding: 12px; border-radius: 16px; }
.dv-c-nguoi { margin-top: 2vh; text-align: center; }
.dv-c-nguoi__so { font-size: clamp(1.3rem, 2.2vw, 2.2rem); margin-bottom: 12px; }
.dv-c-nguoi__so b { color: var(--nhan); font-size: 1.3em; }
.dv-chip { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.dv-chip li { background: rgba(255,255,255,.14); border-radius: 999px; padding: 6px 18px; font-size: clamp(1rem, 1.5vw, 1.5rem); font-weight: 700; }
.dv-c-dau { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 2vh; }
.dv-c-the { background: rgba(255,255,255,.14); border-radius: 999px; padding: 8px 20px; font-size: clamp(1rem, 1.6vw, 1.6rem); font-weight: 700; }
.dv-c-dem { --p: 1; display: grid; place-items: center; width: clamp(80px, 8vw, 130px); aspect-ratio: 1; border-radius: 50%; font-size: clamp(2rem, 3.6vw, 3.8rem);
  font-weight: 900; font-variant-numeric: tabular-nums; background: conic-gradient(var(--nhan) calc(var(--p) * 360deg), rgba(255,255,255,.15) 0); position: relative; }
.dv-c-dem::before { content: ""; position: absolute; inset: 8px; border-radius: 50%; background: var(--c-dam); }
.dv-c-dem span { position: relative; }
.dv-c-cau { background: #fff; color: var(--chu); border-radius: 16px; padding: clamp(16px, 2.4vw, 36px); text-align: center;
  font-size: clamp(1.6rem, 3.2vw, 3.4rem); line-height: 1.25; margin: 0 0 2.5vh; overflow-wrap: anywhere; }
.dv-c-luoi { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(10px, 1.4vw, 20px); flex: 1; }
.dv-c-luoi .dv-o { font-size: clamp(1.3rem, 2.4vw, 2.6rem); padding: clamp(14px, 2vw, 30px); border-radius: 14px; gap: clamp(10px, 1.4vw, 24px); min-height: 12vh; }
.dv-c-luoi .dv-hinh { width: clamp(32px, 3.4vw, 60px); height: clamp(32px, 3.4vw, 60px); }
.dv-c-luoi--gon { flex: none; }
.dv-c-luoi--gon .dv-o { min-height: 0; font-size: clamp(1.1rem, 1.8vw, 2rem); padding: clamp(10px, 1.2vw, 18px); }
.dv-c-luoi .dv-o__dung { font-size: .7em; padding: 4px 14px; }
.dv-c-bd { display: flex; justify-content: center; align-items: flex-end; gap: clamp(16px, 3vw, 56px); height: 30vh; margin-bottom: 2.5vh; }
.dv-c-bd__cot { display: flex; flex-direction: column; align-items: center; justify-content: flex-end; height: 100%; width: clamp(70px, 9vw, 150px); }
.dv-c-bd__so { font-size: clamp(1.4rem, 2.4vw, 2.6rem); font-weight: 900; }
.dv-c-bd__thanh { display: block; width: 100%; border-radius: 10px 10px 0 0; min-height: 6px; }
.dv-c-bd__nhan { display: flex; align-items: center; justify-content: center; gap: 6px; width: 100%; padding: 8px 0; border-radius: 0 0 10px 10px; font-size: 1.8rem; }
.dv-c-tieu { text-align: center; font-size: clamp(2rem, 4vw, 4.2rem); color: var(--nhan); margin: 1vh 0; }
.dv-c-xh { list-style: none; margin: 3vh auto 0; padding: 0; width: min(1100px, 100%); display: grid; gap: 14px; }
.dv-c-xh li { display: flex; align-items: center; gap: 20px; background: #fff; color: var(--chu); border-radius: 14px; padding: clamp(10px, 1.4vw, 20px) 24px;
  font-size: clamp(1.3rem, 2.4vw, 2.6rem); font-weight: 800; }
.dv-c-xh:not(.dv-c-xh--nho) li:first-child { background: var(--nhan); }
.dv-c-xh__hang { flex: none; width: 1.6em; height: 1.6em; display: grid; place-items: center; border-radius: 50%; background: var(--c-dam); color: #fff; font-size: .8em; }
.dv-c-xh__ten { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.dv-c-xh__diem { flex: none; font-variant-numeric: tabular-nums; }
.dv-c-xh--nho { margin-top: 3vh; width: min(800px, 100%); }
.dv-c-xh--nho li { font-size: clamp(1rem, 1.6vw, 1.6rem); background: rgba(255,255,255,.9); }
.dv-buc { display: flex; justify-content: center; align-items: flex-end; gap: clamp(10px, 2vw, 30px); margin-top: 3vh; height: 46vh; }
.dv-buc__cot { display: flex; flex-direction: column; align-items: center; justify-content: flex-end; width: clamp(160px, 20vw, 320px); height: 100%; text-align: center; }
.dv-buc__ten { font-size: clamp(1.3rem, 2.4vw, 2.8rem); font-weight: 900; overflow-wrap: anywhere; }
.dv-buc__diem { font-size: clamp(1rem, 1.6vw, 1.7rem); color: #dbe6f5; margin-bottom: 10px; }
.dv-buc__khoi { width: 100%; border-radius: 14px 14px 0 0; display: grid; place-items: start center; padding-top: 14px; background: #d9e3f1; color: var(--c-dam); }
.dv-buc__cot--1 .dv-buc__khoi { height: 62%; background: var(--nhan); }
.dv-buc__cot--2 .dv-buc__khoi { height: 44%; }
.dv-buc__cot--3 .dv-buc__khoi { height: 30%; background: #e9c79a; }
.dv-buc__hang { font-size: clamp(2.4rem, 5vw, 5rem); font-weight: 900; }
.dv-c-dk { position: fixed; right: 16px; bottom: 14px; display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; opacity: .55; transition: opacity .2s; z-index: 50; }
.dv-c-dk:hover, .dv-c-dk:focus-within { opacity: 1; }
.che-do-chieu .dv-c-dk__nut { background: rgba(255,255,255,.12); border-color: rgba(255,255,255,.4); color: #fff; }
.che-do-chieu .dv-c-dk__nut:hover { background: #fff; color: var(--c-dam); }
.che-do-chieu .dv-c-dk__nut.nut--nguy { color: #ffd4cf; }
.che-do-chieu .dv-bao-loi { bottom: 70px; }
@media (prefers-reduced-motion: reduce) { .dv-cho-cham i { animation: none; opacity: .7; } }