:root{--tim:#3D1F8C;--tim-dam:#1d0d45;--tim-vua:#2a1460;--cam:#C2410C;--cam-sang:#F39A2B;--chu:#2a1f4a;--nen:#F4F1FA;--W:#15803D;--M:#1D4ED8;--T:#C2410C;--Wl:#6EE7A0;--Ml:#8FC1FF;--Tl:#FFB454}
*{box-sizing:border-box;margin:0;padding:0}
html,body{background:var(--nen);color:var(--chu);font-family:-apple-system,'SF Pro Text','Segoe UI',Roboto,'Helvetica Neue',sans-serif;-webkit-text-size-adjust:100%}
body{min-height:100vh;padding-bottom:env(safe-area-inset-bottom)}
button{font:inherit;cursor:pointer;border:0;touch-action:manipulation}
.top{position:sticky;top:0;z-index:5;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:calc(8px + env(safe-area-inset-top)) 16px 8px;background:#fff;color:var(--chu);border-bottom:1px solid #e6e0f3;box-shadow:0 2px 8px rgba(40,20,90,.06)}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;white-space:nowrap;flex:none}
.brand img{height:34px;width:auto;display:block}
.brand span{font-weight:800;font-size:18px;color:#1F4E9C;letter-spacing:.2px}.brand b{color:#6B2C7A;font-weight:800}
.top .sub{font-size:13px;color:#6b6585;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;text-align:right}
main{max-width:760px;margin:0 auto;padding:16px}
h1{font-size:26px;line-height:1.2;color:var(--tim);margin:6px 0 4px}
h2{font-size:20px;color:var(--tim);margin:18px 0 8px}
.muted{color:#6b6585;font-size:15px;line-height:1.45}
.list{display:grid;gap:12px;margin-top:14px}
.item{display:flex;gap:14px;align-items:center;background:#fff;border-radius:18px;padding:14px;box-shadow:0 2px 10px rgba(40,20,90,.08);text-decoration:none;color:inherit;text-align:left;width:100%}
.item img,.item .ph{width:88px;height:56px;border-radius:12px;object-fit:cover;flex:none;background:var(--tim-vua)}
.item .t{font-weight:800;font-size:17px;color:var(--tim)}.item .d{font-size:14px;color:#6b6585;margin-top:2px}
.mode{border-left:6px solid var(--tim)}.mode.b{border-left-color:var(--cam)}.mode.c{border-left-color:var(--tim-dam)}
.mode .k{font-size:28px;width:48px;height:48px;border-radius:50%;background:var(--tim);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:900;flex:none}
.mode.b .k{background:var(--cam)}.mode.c .k{background:var(--tim-dam)}
/* màn luyện */
.card{background:#fff;border-radius:20px;overflow:hidden;box-shadow:0 4px 18px rgba(40,20,90,.12)}
.pic{position:relative;aspect-ratio:16/9;background:linear-gradient(135deg,var(--tim),var(--tim-dam))}
.pic{overflow:hidden}
.pic .nen{position:absolute;inset:-24px;background-size:cover;background-position:center;filter:blur(18px) brightness(.85)}
.pic img{position:relative;width:100%;height:100%;object-fit:contain;display:block}
.pic .so{position:absolute;top:10px;right:10px;background:var(--cam);color:#fff;font-weight:900;font-size:14px;border-radius:14px;padding:5px 12px}
.pic .cd{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:96px;height:96px;border-radius:50%;background:var(--cam);border:6px solid #fff;color:#fff;font-weight:900;font-size:48px;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 24px rgba(0,0,0,.35)}
.pic .ph{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:64px;color:#fff;opacity:.85}
.bar{height:6px;background:#e6e0f3}.bar i{display:block;height:100%;background:var(--cam);transition:width .3s}
.body{padding:16px 16px 18px}
.tag{display:inline-block;font-weight:800;font-size:14px;border-radius:14px;padding:5px 12px;background:var(--tim);color:#fff}
.tag.cam{background:var(--cam)}
.q{font-weight:900;font-size:24px;line-height:1.2;margin-top:10px;color:var(--tim-dam)}
.qvi{color:#6b6585;font-size:16px;margin-top:4px}
.a{font-weight:800;font-size:20px;line-height:1.35;margin-top:14px}
.a b{white-space:nowrap}
.a .W{color:var(--W)}.a .M{color:var(--M)}.a .T{color:var(--T)}
.avi{color:#6b6585;font-size:15px;margin-top:4px}
.leg{display:flex;gap:14px;flex-wrap:wrap;font-size:13px;font-weight:700;margin-top:10px}
.leg span::before{content:"";display:inline-block;width:10px;height:10px;border-radius:50%;background:currentColor;margin-right:6px}
.hint{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}
.hint span{font-weight:900;font-size:20px;border:3px solid currentColor;border-radius:24px;padding:6px 16px}
.btns{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:16px}
.btn{background:#ece7f7;color:var(--tim);font-weight:800;font-size:16px;border-radius:14px;padding:14px 10px;min-height:52px}
.btn.chinh{background:var(--tim);color:#fff;grid-column:1/-1}
.btn.cam{background:var(--cam);color:#fff}
.btn:disabled{opacity:.45}
.rec{display:flex;align-items:center;gap:8px;color:var(--cam);font-weight:800;margin-top:12px}
.rec::before{content:"";width:12px;height:12px;border-radius:50%;background:var(--cam);animation:nhay 1s infinite}
@keyframes nhay{50%{opacity:.2}}
.huongdan{background:#fff;border-radius:18px;padding:16px;margin-top:14px;line-height:1.5;font-size:16px}
.huongdan li{margin:6px 0 6px 20px}
.review{display:grid;gap:10px;margin-top:12px}
.review .r{background:#fff;border-radius:14px;padding:12px}
.review .r .q{font-size:18px;margin-top:0}
.review .btns{margin-top:10px}
.foot{font-size:12px;color:#8a85a0;text-align:center;margin:26px 0 10px;line-height:1.4}
/* nhóm từ / khung từ (bước 2) */
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{font:inherit;font-size:15px;font-weight:700;background:#fff;border:2px solid currentColor;border-radius:18px;padding:5px 11px;line-height:1.2;cursor:pointer;min-height:44px}
span.chip{cursor:default;display:inline-flex;align-items:center}
.chip.W{color:var(--W)}.chip.M{color:var(--M)}.chip.T{color:var(--T)}
.chip.chon{color:#fff}.chip.W.chon{background:var(--W);border-color:var(--W)}.chip.M.chon{background:var(--M);border-color:var(--M)}.chip.T.chon{background:var(--T);border-color:var(--T)}
.thamkhao{margin-top:6px}.thamkhao summary{cursor:pointer;font-weight:700;color:var(--tim)}
.mode.tu{border-left-color:var(--W)}.mode.tu .k{background:var(--W);font-size:18px}
.card.nho .pic{aspect-ratio:auto;height:110px}
.rec.nho{display:inline-block;margin:0 0 0 8px;font-size:13px;vertical-align:middle}
@media (max-width:600px){.card.chude .pic{aspect-ratio:auto;height:150px}.card.chude .body{padding-top:10px;padding-bottom:10px}}
/* trang chủ */
.hero{text-align:center;background:#fff;border-radius:22px;padding:22px 16px 18px;box-shadow:0 2px 12px rgba(40,20,90,.08)}
.hero img{height:84px;width:auto}
.hero-ten{font-weight:900;font-size:26px;color:#1F4E9C;letter-spacing:.3px;margin-top:6px}.hero-ten b{color:#6B2C7A}
.hero h1{font-size:22px;margin-top:8px}
.tds{display:flex;gap:10px;flex-wrap:wrap}
.td{font-size:18px;font-weight:900;min-width:72px;min-height:48px;border-radius:14px;background:#fff;color:var(--tim);border:2px solid var(--tim)}
.td.chon{background:var(--tim);color:#fff}
.dem{font-size:14px;font-weight:700;color:#6b6585;margin-left:6px}
.chude-the img{width:96px;height:60px}
.chude-the .nd{flex:1;min-width:0}
.chude-the .vao{flex:none;font-weight:800;font-size:14px;color:#fff;background:var(--cam);border-radius:12px;padding:8px 10px}
.capdo{margin-top:16px;background:#fff;border-radius:18px;padding:14px;display:grid;gap:8px;font-size:15px;line-height:1.4}
.cd-dong{display:flex;gap:10px;align-items:center}
.cd-so{flex:none;width:28px;height:28px;border-radius:50%;color:#fff;font-weight:900;display:flex;align-items:center;justify-content:center;background:var(--tim)}
.cd-so.s2{background:var(--cam)}.cd-so.s3{background:var(--tim-dam)}
@media (max-width:420px){.chude-the img{width:72px;height:48px}.chude-the .vao{padding:7px 8px;font-size:14px}}
@media (min-width:601px){.card.chude .pic{aspect-ratio:auto;height:min(200px,24vh)}}
/* màn luyện: thanh hướng dẫn bên trái (VKT 10/11/2026) */
body.dang-luyen main{max-width:1080px}
.luyen{display:grid;grid-template-columns:270px 1fr;gap:18px;align-items:start}
.thanh{position:sticky;top:70px;background:#fff;border-radius:20px;padding:16px;box-shadow:0 4px 18px rgba(40,20,90,.10);display:grid;gap:12px}
.th-dau{display:flex;flex-direction:column;gap:2px}
.th-cap{font-weight:900;font-size:17px;color:var(--tim)}
.th-so{font-weight:700;font-size:14px;color:#6b6585}
.thanh .bar{border-radius:3px;overflow:hidden}
.buoc{list-style:none;display:grid;gap:8px}
.buoc li{display:flex;gap:10px;align-items:flex-start;padding:10px;border-radius:14px;color:#8a85a0}
.buoc .bs{flex:none;width:30px;height:30px;border-radius:50%;background:#ece7f7;color:var(--tim);font-weight:900;display:flex;align-items:center;justify-content:center}
.buoc .bv{font-weight:800;font-size:16px;line-height:1.25}
.buoc .bv small{display:block;font-weight:600;font-size:14px;margin-top:2px}
.buoc li.qua .bs{background:var(--W);color:#fff}
.buoc li.dang{background:#fff4ea;color:var(--chu);outline:2px solid var(--cam)}
.buoc li.dang .bs{background:var(--cam);color:#fff}
.buoc li.dang .bv{color:var(--cam)}.buoc li.dang .bv small{color:var(--chu)}
.th-dem{display:flex;align-items:center;gap:12px;font-weight:800;color:var(--tim)}
.th-dem .cd{flex:none;width:64px;height:64px;border-radius:50%;background:var(--tim);color:#fff;font-size:30px;font-weight:900;display:flex;align-items:center;justify-content:center}
.th-dem.ghi{color:var(--cam)}.th-dem.ghi .cd{background:var(--cam);animation:vien 1.2s infinite}
@keyframes vien{0%{box-shadow:0 0 0 0 rgba(194,65,12,.45)}100%{box-shadow:0 0 0 14px rgba(194,65,12,0)}}
.th-thoat{background:none;color:#6b6585;font-weight:700;font-size:15px;min-height:44px;border:2px solid #ece7f7;border-radius:12px}
.the .pic{aspect-ratio:auto;height:min(240px,28vh)}
.the .body>.q:first-child{margin-top:0}
.q.nho{font-size:20px}
.cho{font-size:20px;font-weight:800;color:var(--tim);text-align:center;padding:18px 0}
@media (max-width:759px){
  .luyen{grid-template-columns:1fr;gap:10px}
  .thanh{position:static;padding:10px 12px;gap:8px;grid-template-columns:1fr auto;align-items:center;border-radius:16px}
  .th-dau{flex-direction:row;gap:8px;align-items:baseline;flex-wrap:wrap}.th-cap{font-size:15px}.th-so{font-size:14px}
  .thanh .bar{grid-column:1/-1;order:-1;display:none}
  .buoc{grid-column:1/-1;display:flex;gap:6px}.buoc li.dang{flex:1;min-width:0}
  .buoc li{padding:4px;gap:6px;align-items:center}.buoc li:not(.dang) .bv{display:none}
  .buoc li.dang{padding:4px 10px 4px 4px}.buoc .bv{font-size:15px}.buoc .bv small{font-size:14px}
  .th-dem{grid-column:2;grid-row:2;flex-direction:column;gap:2px;font-size:14px;text-align:center;max-width:96px;line-height:1.15}.th-dem .cd{width:46px;height:46px;font-size:22px}
  .buoc{grid-column:1}
  .th-thoat{grid-column:2;grid-row:1;font-size:14px;min-height:44px;padding:0 12px}
  .thanh:not(:has(.th-dem)) .buoc{grid-column:1/-1}
  .btns.ba{grid-template-columns:1fr 1fr 1fr;gap:8px}.btns.ba .btn{font-size:14px;padding:10px 6px;min-height:52px}
  .the .pic{height:min(calc((100vw - 32px) * .5625),24vh)}
  .the .body{padding:12px 14px 14px}
}
.btns.ba .btn.chinh{grid-column:1/-1}
@media (min-width:760px){.btns.ba #minh{grid-column:1/-1}}
/* cấp độ 2: mục tiêu câu trả lời (thay khung câu + cụm gợi ý, VKT 10/11/2026) */
.muctieu{margin-top:12px;display:grid;gap:8px}
.mt-ten{font-weight:800;font-size:16px;color:var(--tim)}
.mt-ds{display:grid;gap:8px}
.mt{display:flex;justify-content:space-between;align-items:center;gap:10px;width:100%;background:#fff;border:2px solid currentColor;border-radius:14px;padding:10px 14px;min-height:52px;text-align:left}
.mt b{font-size:18px;font-weight:900}.mt small{font-size:15px;font-weight:700}
.mt.W{color:var(--W)}.mt.M{color:var(--M)}.mt.T{color:var(--T)}
.mt.chon{color:#fff}.mt.W.chon{background:var(--W)}.mt.M.chon{background:var(--M)}.mt.T.chon{background:var(--T)}
.mt.chon b::before{content:"✓ "}
.mt-goi{font-size:14px;color:#6b6585}

/* màn đáp án: các nút nghe một hàng (3 hoặc 4 nút), nút Câu tiếp cả hàng */
.btns.gon{grid-template-columns:repeat(3,1fr);gap:8px}.btns.gon4{grid-template-columns:repeat(4,1fr)}
.btns.gon .btn{padding:10px 6px;line-height:1.2}.btns.gon .btn.chinh{grid-column:1/-1}
@media (max-width:600px){.btns.gon .btn{font-size:14px}.the:has(.btns.gon) .pic{height:120px}}
.pic .cd{z-index:2;background:var(--tim)}.pic .cd.ghi{background:var(--cam);animation:vien 1.2s infinite}
@media (max-width:600px){.pic .cd{width:72px;height:72px;font-size:36px;border-width:4px}}
/* điện thoại: đồng hồ ở thanh thành một hàng ngang riêng dưới các bước (đủ chức năng như máy tính); hình lúc nói thấp lại cho vừa màn */
@media (max-width:600px){.thanh .buoc{grid-column:1/-1}.thanh .th-dem{grid-column:1/-1;grid-row:auto;flex-direction:row;justify-content:center;max-width:none;gap:10px;font-size:15px}.thanh .th-dem .cd{width:40px;height:40px;font-size:20px}.luyen:has(.th-dem) .the .pic{height:140px}}