/* v2.5.0 — Tự đấu, Thách đấu, bộ câu hỏi nhiều dạng. Tiền tố dx-. Dùng màu chung của trang (tokens.css), hợp cả nền tối. */
:root{--dx-a:#6d5efc;--dx-b:#0f9bd7;--dx-c:#14b8a6;--dx-gold:#f5b301;--dx-red:#ef5b5b;--dx-blue:#2f8be6;--dx-yel:#e0a100;--dx-grn:#2fa66a;--dx-r:20px}

/* ---- Nút lớn ở trang Của em ---- */
.dx-launch{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:4px 0 14px}
.dx-go{display:flex;align-items:center;gap:12px;padding:14px 16px;border-radius:18px;color:#fff;text-decoration:none;box-shadow:0 6px 0 rgba(0,0,0,.18),0 10px 24px rgba(20,33,30,.12);transform:translateY(0);transition:transform .08s,box-shadow .08s}
.dx-go:active{transform:translateY(5px);box-shadow:0 1px 0 rgba(0,0,0,.18)}
.dx-go.td{background:linear-gradient(135deg,#6d5efc,#0f9bd7)}.dx-go.vs{background:linear-gradient(135deg,#f97316,#ef4444)}
.dx-go .ic{font-size:2rem;width:48px;height:48px;border-radius:14px;background:rgba(255,255,255,.2);display:grid;place-items:center;flex:none}
.dx-go b{display:block;font-size:1.1rem}.dx-go small{opacity:.9}
@media(max-width:520px){.dx-launch{grid-template-columns:1fr}}

/* ---- Sảnh Tự đấu ---- */
.dx-arena{display:flex;flex-direction:column;gap:14px}
.dx-heroCard{position:relative;overflow:hidden;display:flex;gap:16px;align-items:center;border-radius:24px;padding:24px 22px;color:#fff;background:radial-gradient(120% 140% at 0% 0%,#8b7dff 0%,#6d5efc 38%,#0f9bd7 100%);box-shadow:0 14px 34px rgba(80,70,220,.28)}
.dx-heroCard::after{content:"";position:absolute;inset:auto -60px -80px auto;width:260px;height:260px;border-radius:50%;background:rgba(255,255,255,.08)}
.dx-heroTx{flex:1;min-width:0;position:relative;z-index:1}
.dx-kicker{display:inline-block;font-weight:800;letter-spacing:.02em;background:rgba(255,255,255,.18);padding:4px 10px;border-radius:999px;font-size:.85rem}
.dx-heroCard h2{margin:10px 0 6px;font-size:clamp(1.4rem,4.6vw,2rem);line-height:1.15}
.dx-heroCard p{margin:0 0 12px;opacity:.95;max-width:56ch}
.dx-chips{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:16px}.dx-chips span{background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.25);padding:5px 10px;border-radius:999px;font-weight:700;font-size:.88rem}
.dx-heroArt{position:relative;z-index:1;display:grid;grid-template-columns:1fr 1fr;gap:10px;flex:none}
.dx-heroArt span{width:64px;height:64px;border-radius:18px;background:rgba(255,255,255,.18);display:grid;place-items:center;font-size:2rem;animation:dxFloat 3s ease-in-out infinite}
.dx-heroArt span:nth-child(2){animation-delay:.4s}.dx-heroArt span:nth-child(3){animation-delay:.8s}.dx-heroArt span:nth-child(4){animation-delay:1.2s}
@keyframes dxFloat{50%{transform:translateY(-8px) rotate(-4deg)}}
@media(max-width:560px){.dx-heroArt{display:none}}
.dx-start{display:inline-flex;align-items:center;gap:8px;border:0;border-radius:16px;padding:14px 30px;font-size:1.2rem;font-weight:900;color:#3b2a00;background:linear-gradient(180deg,#ffd84d,#f5b301);box-shadow:0 6px 0 #b98400,0 12px 22px rgba(0,0,0,.18);cursor:pointer;transition:transform .08s,box-shadow .08s;text-decoration:none}
.dx-start:hover{filter:brightness(1.04)}.dx-start:active{transform:translateY(5px);box-shadow:0 1px 0 #b98400}
.dx-start:disabled{opacity:.6;cursor:not-allowed}.dx-start.sm{padding:11px 20px;font-size:1rem}
.dx-left{margin:12px 0 0;font-size:.95rem;opacity:.95}.dx-warn{display:inline-block;background:#fff3;padding:6px 10px;border-radius:10px;font-weight:700}
.dx-pick{display:flex;align-items:center;gap:8px;margin-bottom:12px;font-weight:700}.dx-pick select{border-radius:10px;padding:4px 8px;border:0;font-weight:800}
.dx-two{display:grid;grid-template-columns:1fr 1fr;gap:14px}@media(max-width:720px){.dx-two{grid-template-columns:1fr}}
.dx-panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--dx-r);padding:16px 18px;box-shadow:var(--shadow)}
.dx-panel h3{margin:0 0 10px;font-size:1.05rem}.dx-mute{color:var(--mute);margin:0}
.dx-steps{margin:0;padding-left:20px;display:grid;gap:8px}.dx-steps li::marker{font-weight:900;color:var(--dx-a)}
.dx-bestTop{background:var(--acc-t);border-radius:12px;padding:8px 12px;margin-bottom:8px}
.dx-hist{list-style:none;margin:0;padding:0;display:grid;gap:6px}.dx-hist li{display:flex;gap:10px;align-items:baseline;border-bottom:1px dashed var(--line);padding:4px 0}.dx-hist li span{color:var(--mute);min-width:84px}.dx-hist li small{margin-left:auto;color:var(--mute)}

/* ---- Đếm ngược ---- */
.dx-count{min-height:52vh;display:grid;place-items:center;align-content:center;text-align:center}
.dx-count .num{font-size:clamp(5rem,26vw,10rem);font-weight:900;background:linear-gradient(135deg,#6d5efc,#0f9bd7);-webkit-background-clip:text;background-clip:text;color:transparent;animation:dxPop .8s cubic-bezier(.2,1.6,.4,1)}
.dx-count p{color:var(--mute);font-weight:700;margin:0}
@keyframes dxPop{from{transform:scale(1.8);opacity:0}to{transform:scale(1);opacity:1}}

/* ---- Khung làm bài ---- */
.dx-play{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.dx-bar{display:flex;align-items:center;gap:12px;background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:8px 12px;box-shadow:var(--shadow);position:sticky;top:6px;z-index:5}
.dx-timer{position:relative;width:56px;height:56px;flex:none}.dx-timer svg{width:56px;height:56px;transform:rotate(-90deg)}
.dx-timer circle{fill:none;stroke-width:6}.dx-timer .bg{stroke:var(--surface2)}.dx-timer .fg{stroke:var(--dx-a);stroke-linecap:round;transition:stroke-dashoffset .25s linear,stroke .3s}
.dx-timer span{position:absolute;inset:0;display:grid;place-items:center;font-weight:900;font-size:.82rem;font-variant-numeric:tabular-nums}
.dx-timer.low .fg{stroke:var(--dx-red)}.dx-timer.low span{color:var(--dx-red);animation:dxBeat 1s ease-in-out infinite}
@keyframes dxBeat{50%{transform:scale(1.08)}}
.dx-mid{flex:1;min-width:0}.dx-title{font-weight:800;font-size:.92rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.dx-segs{display:flex;gap:3px;margin-top:6px}.dx-segs i{flex:1;height:8px;border-radius:99px;background:var(--surface2);transition:background .2s}
.dx-segs i.cur{background:color-mix(in srgb,var(--dx-a) 45%,var(--surface2))}.dx-segs i.ok{background:var(--dx-grn)}.dx-segs i.no{background:var(--dx-red)}
.dx-score{text-align:center;min-width:54px}.dx-score small{display:block;color:var(--mute);font-size:.72rem;font-weight:700}.dx-score b{font-size:1.4rem;font-weight:900;color:var(--dx-a);font-variant-numeric:tabular-nums}
.dx-sound{border:0;background:none;font-size:1.2rem;cursor:pointer;padding:4px;border-radius:8px}
.dx-vs{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.dx-vs>div{display:flex;align-items:center;gap:8px;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:8px 10px}
.dx-vs span{font-weight:800;font-size:.85rem;max-width:90px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.dx-vs .track{flex:1;height:10px;border-radius:99px;background:var(--surface2);overflow:hidden}.dx-vs .track i{display:block;height:100%;width:0;border-radius:99px;transition:width .5s cubic-bezier(.2,1.2,.4,1)}
.dx-vs .me .track i{background:linear-gradient(90deg,#6d5efc,#0f9bd7)}.dx-vs .op .track i{background:linear-gradient(90deg,#f97316,#ef4444)}
.dx-vs b{font-variant-numeric:tabular-nums;min-width:30px;text-align:right}
.dx-stage{display:flex;flex-direction:column;gap:10px}.dx-num{color:var(--mute);font-weight:800;font-size:.9rem;text-align:center}
.dx-enter{animation:dxIn .35s cubic-bezier(.2,1,.3,1)}@keyframes dxIn{from{opacity:0;transform:translateY(14px) scale(.98)}}
.dx-foot{display:flex;align-items:center;gap:10px}.dx-foot .grow{flex:1}
.dx-btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:44px;padding:0 18px;border-radius:14px;border:0;font-weight:800;font-size:1rem;cursor:pointer;color:#fff;background:var(--dx-a);box-shadow:0 4px 0 #4b3fd1;text-decoration:none;transition:transform .08s,box-shadow .08s}
.dx-btn:active{transform:translateY(4px);box-shadow:none}.dx-btn.ghost{background:var(--surface);color:var(--fg);border:1px solid var(--line);box-shadow:0 3px 0 var(--line)}

/* ---- Thẻ câu hỏi ---- */
.dx-card{background:var(--surface);border:1px solid var(--line);border-radius:24px;padding:18px 18px 20px;box-shadow:0 10px 30px rgba(20,33,30,.08);display:flex;flex-direction:column;gap:14px}
.dx-qhead{display:flex;align-items:center;gap:10px}
.dx-type{display:inline-flex;align-items:center;gap:6px;font-weight:800;font-size:.82rem;color:var(--dx-a);background:color-mix(in srgb,var(--dx-a) 12%,transparent);padding:4px 10px;border-radius:999px}
.dx-qic{margin-left:auto;font-size:2rem;line-height:1}
.dx-qtext{font-size:clamp(1.15rem,4.2vw,1.6rem);font-weight:800;line-height:1.4;text-align:center;overflow-wrap:anywhere}
.dx-inline{line-height:2}
.dx-card.dx-right{border-color:var(--dx-grn);box-shadow:0 0 0 3px color-mix(in srgb,var(--dx-grn) 30%,transparent),0 10px 30px rgba(20,33,30,.08);animation:dxYes .45s}
.dx-card.dx-wrong{border-color:var(--dx-red);animation:dxNo .4s}
@keyframes dxYes{40%{transform:scale(1.015)}}@keyframes dxNo{20%,60%{transform:translateX(-6px)}40%,80%{transform:translateX(6px)}}
.dx-check{align-self:center;height:48px;padding:0 34px;border-radius:16px;border:0;font-size:1.05rem;font-weight:900;color:#fff;background:linear-gradient(180deg,#22c55e,#16a34a);box-shadow:0 5px 0 #11793a;cursor:pointer;transition:transform .08s,box-shadow .08s,opacity .2s}
.dx-check:active{transform:translateY(5px);box-shadow:none}.dx-check:disabled{opacity:.45;cursor:not-allowed;filter:grayscale(.4)}
.dx-answered .dx-check{display:none}
.dx-hint{margin:-4px 0 0;text-align:center;color:var(--mute);font-size:.85rem}.dx-answered .dx-hint{display:none}

/* chọn đáp án (1 và nhiều) */
.dx-opts{display:grid;grid-template-columns:1fr 1fr;gap:12px}@media(max-width:460px){.dx-opts{grid-template-columns:1fr}}
.dx-opt{display:flex;align-items:center;gap:10px;min-height:68px;border:0;border-radius:18px;padding:12px 14px;color:#fff;font-size:clamp(1rem,3.8vw,1.25rem);font-weight:800;text-align:left;cursor:pointer;box-shadow:0 5px 0 rgba(0,0,0,.22);transition:transform .08s,box-shadow .08s,filter .2s}
.dx-opt:active{transform:translateY(5px);box-shadow:none}
.dx-opt b{flex:none;width:32px;height:32px;border-radius:50%;background:rgba(255,255,255,.28);display:grid;place-items:center}
.dx-opt span{min-width:0;overflow-wrap:anywhere}
.dx-opt.c0{background:var(--dx-red)}.dx-opt.c1{background:var(--dx-blue)}.dx-opt.c2{background:var(--dx-yel)}.dx-opt.c3{background:var(--dx-grn)}
.dx-t-multi .dx-opt b::after{content:""}.dx-t-multi .dx-opt.pick b::after{content:"✓"}.dx-t-multi .dx-opt.pick{outline:4px solid #fff;outline-offset:-7px}
.dx-opt.right{outline:4px solid #fff;outline-offset:-7px;box-shadow:0 0 0 5px var(--dx-grn)}.dx-opt.wrong{filter:grayscale(.5) brightness(.85)}.dx-opt.dim{filter:grayscale(.85) opacity(.55)}

/* đúng / sai */
.dx-tf{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.dx-tf button{display:flex;flex-direction:column;align-items:center;gap:4px;min-height:96px;border:0;border-radius:20px;font-size:1.25rem;font-weight:900;color:#fff;cursor:pointer;box-shadow:0 6px 0 rgba(0,0,0,.2);transition:transform .08s,box-shadow .08s}
.dx-tf button i{font-style:normal;font-size:2rem;line-height:1}.dx-tf button:active{transform:translateY(6px);box-shadow:none}
.dx-yes{background:linear-gradient(180deg,#34d27a,#1f9d55)}.dx-no{background:linear-gradient(180deg,#ff7a7a,#e04848)}
.dx-tf .right{outline:4px solid #fff;outline-offset:-8px;box-shadow:0 0 0 5px var(--dx-gold)}.dx-tf .wrong,.dx-tf .dim{filter:grayscale(.85) opacity(.6)}

/* đúng / sai nhiều ý */
.dx-tfm{display:flex;flex-direction:column;gap:8px}
.dx-row{display:flex;align-items:center;gap:12px;border:1px solid var(--line);border-radius:14px;padding:10px 12px;background:var(--surface2)}
.dx-st{flex:1;font-weight:700}.dx-pill{display:flex;border-radius:999px;overflow:hidden;border:1px solid var(--line);flex:none}
.dx-pill button{width:44px;height:38px;border:0;background:var(--surface);font-weight:900;cursor:pointer;color:var(--mute)}
.dx-pill button[data-v="1"].on{background:var(--dx-grn);color:#fff}.dx-pill button[data-v="0"].on{background:var(--dx-red);color:#fff}
.dx-row.right{border-color:var(--dx-grn);background:var(--ok-t)}.dx-row.wrong{border-color:var(--dx-red);background:var(--bad-t)}
.dx-pill button.truth{box-shadow:inset 0 0 0 3px var(--dx-gold)}

/* điền ô, điền chữ */
.dx-in{font:inherit;font-weight:900;text-align:center;min-width:3ch;padding:4px 8px;margin:0 4px;border:0;border-bottom:3px solid var(--dx-a);background:color-mix(in srgb,var(--dx-a) 8%,transparent);border-radius:10px 10px 4px 4px;color:var(--fg);outline:none}
.dx-in:focus{background:color-mix(in srgb,var(--dx-a) 16%,transparent)}
.dx-word{display:flex;justify-content:center}.dx-word .dx-in{font-size:1.3rem;min-width:min(260px,80%);padding:10px 14px}
.dx-in.right{border-color:var(--dx-grn);background:var(--ok-t)}.dx-in.wrong{border-color:var(--dx-red);background:var(--bad-t);text-decoration:line-through}

/* so sánh */
.dx-cmp{display:flex;align-items:center;justify-content:center;gap:14px;flex-wrap:wrap}
.dx-side{min-width:96px;text-align:center;font-size:clamp(1.4rem,5.5vw,2.1rem);font-weight:900;padding:14px 16px;border-radius:18px;background:var(--surface2);border:1px solid var(--line)}
.dx-sign{width:68px;height:68px;border-radius:50%;display:grid;place-items:center;font-size:2rem;font-weight:900;border:3px dashed var(--dx-a);color:var(--dx-a)}
.dx-sign.right{border-style:solid;border-color:var(--dx-grn);color:var(--dx-grn);background:var(--ok-t)}.dx-sign.wrong{border-style:solid;border-color:var(--dx-red);color:var(--dx-red)}
.dx-signs{display:flex;justify-content:center;gap:14px}
.dx-signs button{width:76px;height:64px;border:0;border-radius:18px;font-size:2rem;font-weight:900;color:#fff;cursor:pointer;background:linear-gradient(180deg,#8b7dff,#6d5efc);box-shadow:0 5px 0 #4b3fd1;transition:transform .08s,box-shadow .08s}
.dx-signs button:active{transform:translateY(5px);box-shadow:none}.dx-signs .right{background:linear-gradient(180deg,#34d27a,#1f9d55);box-shadow:0 5px 0 #11793a}.dx-signs .wrong,.dx-signs .dim{filter:grayscale(.85) opacity(.55)}

/* sắp xếp, kéo thả */
.dx-seq{display:flex;align-items:center;justify-content:center;gap:6px;flex-wrap:wrap}.dx-arrow{font-style:normal;color:var(--mute);font-weight:900}
.dx-slot{display:inline-flex;align-items:center;justify-content:center;vertical-align:middle;min-width:76px;min-height:52px;margin:0 3px;padding:3px;border-radius:14px;border:2.5px dashed color-mix(in srgb,var(--dx-a) 55%,var(--line));background:color-mix(in srgb,var(--dx-a) 6%,transparent);transition:background .15s,border-color .15s,transform .15s}
.dx-slot em{font-style:normal;color:var(--mute);font-weight:800;font-size:.9rem}
.dx-slot.hov{background:color-mix(in srgb,var(--dx-a) 18%,transparent);border-color:var(--dx-a);transform:scale(1.05)}
.dx-slot.full{border-style:solid}.dx-slot.right{border-color:var(--dx-grn);background:var(--ok-t)}
.dx-slot.wrong{border-color:var(--dx-red);background:var(--bad-t);position:relative}
.dx-slot.wrong::after{content:"→ " attr(data-truth);position:absolute;top:100%;left:50%;transform:translateX(-50%);font-size:.75rem;font-weight:800;color:var(--dx-grn);white-space:nowrap;margin-top:2px}
.dx-tray{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;padding:12px;border-radius:18px;background:var(--surface2);min-height:68px}
.dx-chip{touch-action:none;user-select:none;-webkit-user-select:none;min-width:64px;min-height:46px;padding:6px 16px;border:0;border-radius:14px;font:inherit;font-size:1.1rem;font-weight:900;color:#fff;cursor:grab;background:linear-gradient(180deg,#38bdf8,#0f9bd7);box-shadow:0 4px 0 #0b6f9c;transition:transform .1s,opacity .2s}
.dx-chip:active{cursor:grabbing}.dx-chip.used{opacity:.25;pointer-events:none;box-shadow:none}.dx-chip.in{min-height:42px;background:linear-gradient(180deg,#8b7dff,#6d5efc);box-shadow:0 3px 0 #4b3fd1}
.dx-chip.dx-lift{opacity:.35}
.dx-ghost{position:fixed;left:0;top:0;z-index:9999;pointer-events:none;transform-origin:center;box-shadow:0 14px 30px rgba(0,0,0,.25)!important;rotate:-4deg}
.dx-answered .dx-chip{pointer-events:none}

/* nối cột */
.dx-match{display:grid;grid-template-columns:1fr 1fr;gap:18px}.dx-col{display:flex;flex-direction:column;gap:10px}
.dx-m{position:relative;min-height:54px;padding:8px 12px;border-radius:14px;border:2px solid var(--line);background:var(--surface2);font:inherit;font-weight:800;font-size:1.05rem;cursor:pointer;transition:transform .1s,border-color .15s,background .15s}
.dx-m.sel{border-color:var(--dx-a);background:color-mix(in srgb,var(--dx-a) 14%,transparent);transform:scale(1.03)}
.dx-m[data-n]:not([data-n=""])::after{content:attr(data-n);position:absolute;top:-9px;width:22px;height:22px;border-radius:50%;color:#fff;font-size:.75rem;display:grid;place-items:center;background:var(--pc,#6d5efc)}
.dx-m.l::after{right:-9px}.dx-m.r::after{left:-9px}
.dx-m.p0{--pc:#6d5efc;border-color:#6d5efc}.dx-m.p1{--pc:#f97316;border-color:#f97316}.dx-m.p2{--pc:#14b8a6;border-color:#14b8a6}.dx-m.p3{--pc:#ec4899;border-color:#ec4899}
.dx-m.right{background:var(--ok-t)}.dx-m.wrong{background:var(--bad-t);border-color:var(--dx-red)}

/* phản hồi sau mỗi câu */
.dx-fb{display:flex;flex-direction:column;gap:2px;border-radius:16px;padding:12px 14px;animation:dxIn .3s}
.dx-fb.ok{background:var(--ok-t);border:1px solid color-mix(in srgb,var(--dx-grn) 40%,transparent)}.dx-fb.no{background:var(--acc-t);border:1px solid color-mix(in srgb,var(--dx-yel) 50%,transparent)}
.dx-fb b{font-size:1.05rem}.dx-fb span{color:var(--fg)}

/* ---- Kết quả ---- */
.dx-result{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:14px}
.dx-hero{position:relative;overflow:hidden;text-align:center;border-radius:26px;padding:26px 18px 22px;color:#fff;background:radial-gradient(120% 120% at 50% 0%,#8b7dff,#6d5efc 45%,#0f9bd7);box-shadow:0 16px 40px rgba(80,70,220,.3)}
.dx-hero.lose{background:radial-gradient(120% 120% at 50% 0%,#94a3b8,#64748b 50%,#475569)}.dx-hero.draw{background:radial-gradient(120% 120% at 50% 0%,#fbbf24,#f59e0b 50%,#d97706)}
.dx-big{font-size:clamp(4rem,18vw,6.5rem);line-height:1;animation:dxPop .9s cubic-bezier(.2,1.6,.4,1);filter:drop-shadow(0 8px 14px rgba(0,0,0,.25))}
.dx-hero h2{margin:8px 0 4px;font-size:clamp(1.4rem,5vw,2rem)}.dx-hero p{margin:0 0 6px;opacity:.95}
.dx-stars{display:flex;justify-content:center;gap:8px;margin:6px 0 12px}
.dx-stars span{font-size:2.6rem;color:rgba(255,255,255,.28);transform:scale(.4);animation:dxStar .5s cubic-bezier(.2,1.8,.4,1) forwards}
.dx-stars span.on{color:var(--dx-gold);text-shadow:0 4px 12px rgba(245,179,1,.6)}
@keyframes dxStar{to{transform:scale(1)}}
.dx-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;background:rgba(255,255,255,.14);border-radius:18px;padding:10px}
.dx-stats b{display:block;font-size:clamp(1.2rem,4.5vw,1.7rem);font-weight:900;font-variant-numeric:tabular-nums}.dx-stats small{opacity:.85;font-weight:700}
@media(max-width:420px){.dx-stats{grid-template-columns:1fr 1fr}}
.dx-btns{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin-top:16px}.dx-hero .dx-btn.ghost{background:rgba(255,255,255,.18);border-color:rgba(255,255,255,.35);color:#fff;box-shadow:none}
.dx-review{background:var(--surface);border:1px solid var(--line);border-radius:var(--dx-r);padding:6px 14px}
.dx-review summary{cursor:pointer;font-weight:800;padding:10px 0}
.dx-rv{display:flex;gap:12px;padding:10px 0;border-top:1px dashed var(--line)}
.dx-rv .n{flex:none;width:30px;height:30px;border-radius:50%;display:grid;place-items:center;font-weight:900;background:var(--surface2)}
.dx-rv.ok .n{background:var(--dx-grn);color:#fff}.dx-rv.no .n{background:var(--dx-red);color:#fff}
.dx-rv .t{font-weight:700}.dx-rv .a{color:var(--mute);font-size:.9rem}.dx-rv .a b{color:var(--fg)}.dx-rv .ex{font-size:.88rem;margin-top:2px}
.dx-rep{margin-top:4px;border:0;background:none;color:var(--mute);text-decoration:underline;font-size:.8rem;cursor:pointer;padding:0}

/* ---- Chọn chế độ Thách đấu ---- */
.dx-lv{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:4px 0 8px}
.dx-lvc{position:relative;display:flex;flex-direction:column;gap:2px;border:2px solid var(--line);border-radius:16px;padding:12px;cursor:pointer;transition:border-color .15s,transform .1s,box-shadow .15s}
.dx-lvc input{position:absolute;opacity:0}.dx-lvc .ic{font-size:1.8rem}.dx-lvc b{font-size:1.1rem}.dx-lvc small{font-weight:800;color:var(--mute)}.dx-lvc em{font-style:normal;font-size:.82rem;color:var(--mute)}
.dx-lvc:has(input:checked){transform:translateY(-2px);box-shadow:0 8px 18px rgba(20,33,30,.12)}
.dx-lvc.de:has(input:checked){border-color:#0f9bd7;background:color-mix(in srgb,#0f9bd7 8%,transparent)}.dx-lvc.kho:has(input:checked){border-color:#ef4444;background:color-mix(in srgb,#ef4444 8%,transparent)}

.dx-confetti{position:fixed;inset:0;width:100vw;height:100vh;pointer-events:none;z-index:10000}
@media (prefers-reduced-motion:reduce){.dx-heroArt span,.dx-count .num,.dx-big,.dx-stars span,.dx-enter,.dx-card.dx-right,.dx-card.dx-wrong,.dx-timer.low span{animation:none!important}.dx-stars span{transform:none}}
/* phần tử đang ẩn (hidden) thì luôn ẩn, kể cả khi kiểu dáng ở trên đặt display */
.dx-fb[hidden],.dx-btn[hidden],.dx-play [hidden]{display:none!important}