[hidden]{display:none!important}
:root{
  --bg:#f4f6f8; --card:#ffffff; --ink:#0f172a; --muted:#64748b; --line:#e2e8f0;
  --brand:#0f766e; --brand-ink:#ffffff; --brand-soft:#ccfbf1;
  --ok:#15803d; --ok-bg:#dcfce7; --warn:#a16207; --warn-bg:#fef3c7; --bad:#b91c1c; --bad-bg:#fee2e2; --miss:#475569; --miss-bg:#e2e8f0;
  --radius:14px; --safe-b:env(safe-area-inset-bottom,0px); --safe-t:env(safe-area-inset-top,0px);
}
@media (prefers-color-scheme:dark){
  :root{--bg:#0b1220;--card:#131c2e;--ink:#e6edf7;--muted:#93a3ba;--line:#24324a;--brand:#2dd4bf;--brand-ink:#04211e;--brand-soft:#0f3a37;
    --ok:#4ade80;--ok-bg:#12351f;--warn:#fbbf24;--warn-bg:#3a2d0b;--bad:#f87171;--bad-bg:#3d1618;--miss:#cbd5e1;--miss-bg:#25324a;}
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.45 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif}
body{padding-top:var(--safe-t);padding-bottom:calc(64px + var(--safe-b))}
h2,h3{margin:.1em 0 .4em}
h2{font-size:1.2rem}h3{font-size:1.02rem}
code{background:var(--line);padding:1px 5px;border-radius:5px;font-size:.85em}
.muted{color:var(--muted)}.small{font-size:.82rem}.center{text-align:center}

.topbar{position:sticky;top:0;z-index:5;display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding:10px 16px;background:var(--card);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.brand .logo{font-size:1.6rem;color:var(--brand)}
.brand b{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:56vw}
.brand small{display:block;color:var(--muted);font-size:.74rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:56vw}
.chip{font-size:.74rem;padding:4px 9px;border-radius:999px;white-space:nowrap}
.chip.ok{background:var(--ok-bg);color:var(--ok)}.chip.warn{background:var(--warn-bg);color:var(--warn)}.chip.bad{background:var(--bad-bg);color:var(--bad)}

main{max-width:760px;margin:0 auto;padding:12px 16px}
.tab{display:none}.tab.active{display:block}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;margin:0 0 12px}
.card.hero{border-color:var(--brand)}
label{display:block;margin:10px 0;font-size:.9rem;font-weight:600}
label.check{display:flex;gap:10px;align-items:flex-start;font-weight:500}
label.check input{width:22px;height:22px;margin-top:1px;flex:none}
input[type=text],input[type=search],input[type=number],select,textarea{width:100%;margin-top:5px;padding:11px 12px;border:1px solid var(--line);
  border-radius:10px;background:var(--bg);color:var(--ink);font:inherit;font-weight:400}
textarea{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.85rem;resize:vertical}
input[type=range]{width:100%;margin-top:8px}
.two{display:grid;grid-template-columns:1fr 1fr;gap:10px}

.btn{appearance:none;border:1px solid var(--line);background:var(--card);color:var(--ink);padding:11px 14px;border-radius:12px;font:inherit;font-weight:600;
  cursor:pointer;min-height:44px}
.btn:active{transform:scale(.98)}
.btn.primary{background:var(--brand);color:var(--brand-ink);border-color:var(--brand)}
.btn.danger{color:var(--bad);border-color:var(--bad)}
.btn.big{flex:1;padding:16px 10px;font-size:1.02rem}
.btn.small{padding:7px 11px;min-height:36px;font-size:.85rem}
.btn[disabled]{opacity:.5}
.btnrow{display:flex;gap:10px;align-items:center;margin-top:10px}
.btnrow.wrap{flex-wrap:wrap}.btnrow.pad{padding:12px 16px}.btnrow.pad .btn{flex:1}
.btnrow.sticky{position:sticky;bottom:calc(70px + var(--safe-b));padding:8px 0}
.btnrow.sticky .btn{flex:1;box-shadow:0 2px 8px rgba(0,0,0,.12)}

.tabbar{position:fixed;left:0;right:0;bottom:0;z-index:6;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));background:var(--card);
  border-top:1px solid var(--line);padding-bottom:var(--safe-b)}
.tabbar button{position:relative;background:none;border:0;color:var(--muted);padding:8px 0 7px;min-width:0;white-space:nowrap;font:inherit;font-size:.72rem;cursor:pointer}
.tabbar button span{display:block;font-size:1.3rem;line-height:1.1}
.tabbar button.active{color:var(--brand);font-weight:700}
.badge{position:absolute;top:3px;left:55%;background:var(--bad);color:#fff;border-radius:999px;font-style:normal;font-size:.66rem;padding:1px 6px}

.toolbar{display:grid;grid-template-columns:1fr 130px;gap:8px;margin-bottom:6px}
.toolbar input,.toolbar select{margin-top:0}
.list{display:flex;flex-direction:column;gap:8px;margin:8px 0}
.row{display:grid;grid-template-columns:1fr auto;gap:2px 10px;align-items:center;background:var(--card);border:1px solid var(--line);
  border-left:5px solid var(--line);border-radius:12px;padding:10px 12px;cursor:pointer}
.row.warn{border-left-color:var(--warn);background:var(--warn-bg)}
.row.bad{border-left-color:var(--bad);background:var(--bad-bg)}
.row.miss{border-left-color:var(--miss);opacity:.8;cursor:default}
.row .nm{font-weight:700;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.row .sc{font-weight:800;font-size:1.25rem;text-align:right}
.row .meta{grid-column:1/3;color:var(--muted);font-size:.8rem}
.row .meta b{color:var(--ink)}
.empty{padding:28px 10px;text-align:center;color:var(--muted)}

.overlay{position:fixed;inset:0;z-index:20;background:var(--bg);display:flex;flex-direction:column;padding-top:var(--safe-t)}
.overlay.dark{background:#05080f;color:#e6edf7}
.overlay[hidden],.sheet[hidden],.toast[hidden]{display:none}
.ovbar{display:flex;align-items:center;gap:10px;padding:10px 12px;background:var(--card);border-bottom:1px solid var(--line);color:var(--ink)}
.overlay.dark .ovbar{background:#0b1220;border-color:#1c2a44;color:#e6edf7}
.ovtitle{flex:1;min-width:0}.ovtitle b{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ovtitle small{display:block;color:var(--muted);font-size:.75rem}
.iconbtn{background:none;border:0;font-size:1.4rem;color:inherit;padding:6px 10px;cursor:pointer;min-width:44px;min-height:44px}
.scorepill{background:var(--brand);color:var(--brand-ink);font-weight:800;border-radius:999px;padding:6px 14px;font-size:1.05rem}
.ovbody{flex:1;overflow:auto;padding:12px 16px calc(24px + var(--safe-b));-webkit-overflow-scrolling:touch}

.seg{display:flex;gap:6px;margin-bottom:8px}
.seg button{flex:1;padding:9px 0;border-radius:10px;border:1px solid var(--line);background:var(--bg);color:var(--ink);font:inherit;font-weight:700;cursor:pointer}
.seg button.on{background:var(--brand);color:var(--brand-ink);border-color:var(--brand)}
.imgbox{overflow:auto;border:1px solid var(--line);border-radius:12px;background:#000;max-height:62vh;-webkit-overflow-scrolling:touch;touch-action:pan-x pan-y}
.imgbox img{display:block;width:100%;height:auto}
.imgbox.zoom img{width:230%}
.legend{display:flex;flex-wrap:wrap;gap:6px 12px;font-size:.74rem;color:var(--muted);margin:8px 0}
.legend i{display:inline-block;width:11px;height:11px;border-radius:50%;margin-right:4px;vertical-align:-1px;border:2px solid}
.note{padding:9px 12px;border-radius:10px;margin:8px 0;font-size:.88rem}
.note.warn{background:var(--warn-bg);color:var(--warn)}.note.bad{background:var(--bad-bg);color:var(--bad)}.note.ok{background:var(--ok-bg);color:var(--ok)}
.fields{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.qrow{display:flex;align-items:center;gap:8px;padding:6px 0;border-bottom:1px solid var(--line)}
.qrow .ql{width:3.3em;font-weight:700;font-size:.88rem;flex:none}
.qrow .opts{display:flex;gap:6px;flex-wrap:wrap;flex:1}
.opt{min-width:40px;min-height:38px;border-radius:9px;border:1px solid var(--line);background:var(--bg);color:var(--ink);font:inherit;font-weight:700;cursor:pointer;padding:0 8px}
.opt.sel{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.opt.sel.right{background:var(--ok);color:#fff;border-color:var(--ok)}
.opt.sel.wrong{background:var(--bad);color:#fff;border-color:var(--bad)}
.opt.key{outline:2px dashed var(--ok);outline-offset:1px}
.qrow input[type=text]{margin:0;padding:7px 9px;max-width:9em}
.qrow .mark{width:1.4em;text-align:center;flex:none}
.sechead{margin:16px 0 4px;font-weight:800;color:var(--brand)}

.cwrap{position:relative;flex:1;overflow:hidden;display:flex;align-items:center;justify-content:center;touch-action:none}
#cCanvas{touch-action:none;max-width:100%;max-height:100%}
#cLoupe{position:absolute;top:10px;left:10px;border-radius:50%;border:3px solid #2dd4bf;background:#000;display:none;pointer-events:none}

.sheet{position:fixed;inset:0;z-index:30;background:rgba(2,6,23,.55);display:flex;align-items:flex-end;justify-content:center}
.sheetbox{width:100%;max-width:760px;background:var(--card);border-radius:18px 18px 0 0;padding:14px 16px calc(18px + var(--safe-b));max-height:78vh;overflow:auto}
#busy{align-items:center}#busy .sheetbox{border-radius:18px;max-width:340px;margin:0 16px}
.sheethead{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.bar{height:10px;background:var(--line);border-radius:999px;overflow:hidden;margin:12px 0 8px}
.bar i{display:block;height:100%;width:0;background:var(--brand);transition:width .2s}
.toast{position:fixed;left:50%;bottom:calc(84px + var(--safe-b));transform:translateX(-50%);z-index:40;background:#0f172a;color:#fff;
  padding:10px 16px;border-radius:12px;font-size:.9rem;max-width:90vw;text-align:center}

.stat3{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-bottom:12px}
.stat3 .card{margin:0;text-align:center;padding:10px 6px}.stat3 b{display:block;font-size:1.35rem}.stat3 span{font-size:.75rem;color:var(--muted)}
.hist{display:flex;align-items:flex-end;gap:4px;height:90px;margin:6px 0}
.hist div{flex:1;background:var(--brand);border-radius:4px 4px 0 0;position:relative;min-height:2px}
.hist div span{position:absolute;top:-16px;left:0;right:0;text-align:center;font-size:.68rem;color:var(--muted)}
.hlab{display:flex;gap:4px;font-size:.68rem;color:var(--muted)}.hlab span{flex:1;text-align:center}
.qitem{display:grid;grid-template-columns:5.6em 1fr auto;gap:8px;align-items:center;padding:9px 6px;border-bottom:1px solid var(--line);cursor:pointer}
.qitem.problem{background:var(--bad-bg)}.qitem.warn{background:var(--warn-bg)}
.qitem .pbar{height:8px;background:var(--line);border-radius:99px;overflow:hidden}.qitem .pbar i{display:block;height:100%;background:var(--ok)}
.qitem .tag{font-size:.7rem;font-weight:700}
.qitem.problem .tag{color:var(--bad)}.qitem.warn .tag{color:var(--warn)}
.sub{font-size:.78rem;color:var(--muted)}

.chips{display:flex;gap:6px;align-items:center}
button.chip{border:0;font:inherit;font-size:.74rem;cursor:pointer;background:var(--ok-bg);color:var(--ok)}
button.chip.warn{background:var(--warn-bg);color:var(--warn)}button.chip.bad{background:var(--bad-bg);color:var(--bad)}
.chk2{display:grid;grid-template-columns:1fr 1fr;gap:6px 12px;margin:10px 0}
.btnrow.sticky{flex-wrap:wrap}.btnrow.sticky .btn{min-width:70px;padding-left:8px;padding-right:8px}
#dlg{z-index:40}#dlg .sheetbox{max-height:80vh}
#dlgBody ul{margin:6px 0 6px 18px;padding:0}
.legend span i.or{border-color:#f97316}

/* ======================= Camera trực tiếp ======================= */
body.camOpen{overflow:hidden}
.cam{position:fixed;left:0;top:0;width:100%;height:100vh;height:100dvh;z-index:60;background:#000;color:#fff;display:flex;flex-direction:column;
  padding-top:var(--safe-t);padding-bottom:var(--safe-b)}
.camTop{display:flex;align-items:center;gap:10px;padding:8px 12px;background:rgba(0,0,0,.55)}
.camBtn{width:44px;height:44px;border-radius:50%;border:0;background:rgba(255,255,255,.16);color:#fff;font-size:1.15rem}
.camBtn.on{background:#fbbf24;color:#000}
.camSeg{flex:1;display:flex;background:rgba(255,255,255,.14);border-radius:999px;padding:3px}
.camSeg button{flex:1;border:0;background:none;color:#e5e7eb;padding:9px 4px;border-radius:999px;font-size:.88rem;font-weight:600}
.camSeg button.on{background:#fff;color:#0f172a}
.camView{position:relative;flex:1;min-height:0;overflow:hidden;background:#000}
.camView video{position:absolute;inset:0;width:100%;height:100%;object-fit:contain}
.camView canvas{position:absolute;left:0;top:0}
.camHint{position:absolute;left:12px;right:12px;bottom:12px;text-align:center;font-weight:600;font-size:.95rem;padding:9px 12px;border-radius:12px;
  background:rgba(0,0,0,.6);color:#fff}
.camHint.ok{background:rgba(21,128,61,.9)}.camHint.warn{background:rgba(180,83,9,.9)}.camHint.busy{background:rgba(15,118,110,.92)}
.camMini{position:absolute;left:10px;right:10px;top:10px;display:flex;flex-wrap:wrap;gap:4px 10px;align-items:baseline;padding:10px 12px;border-radius:12px;
  background:rgba(21,128,61,.94);color:#fff}
.camMini.warn{background:rgba(180,83,9,.95)}.camMini.bad{background:rgba(185,28,28,.95)}
.camMini b{font-size:1.05rem}.camMini span{font-size:.85rem;opacity:.92;flex:1}.camMini em{font-style:normal;font-weight:800;font-size:1.5rem}
.camMini small{flex-basis:100%;font-size:.8rem}
.camMini[hidden],.camHint[hidden]{display:none}
.camFlash{position:absolute;inset:0;background:#fff;opacity:0;pointer-events:none}
.camFlash.go{animation:camFl .25s ease-out}
@keyframes camFl{from{opacity:.75}to{opacity:0}}
.camBot{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 16px 14px;background:rgba(0,0,0,.55)}
.camChip{border:1px solid rgba(255,255,255,.4);background:none;color:#fff;border-radius:999px;padding:9px 12px;font-size:.82rem;min-width:104px}
.camChip.on{background:#22c55e;border-color:#22c55e;color:#04210f;font-weight:700}
.camCount{min-width:104px;text-align:right;font-size:.85rem;color:#e5e7eb}
.camShutter{width:76px;height:76px;border-radius:50%;border:4px solid #fff;background:none;padding:4px}
.camShutter i{display:block;width:100%;height:100%;border-radius:50%;background:#fff;transition:background .15s}
.camShutter.ready{border-color:#22c55e}.camShutter.ready i{background:#22c55e}
.camShutter:active i{transform:scale(.9)}
.camRes{position:absolute;inset:0;z-index:5;background:var(--bg);color:var(--ink);display:flex;flex-direction:column;padding-top:var(--safe-t)}
.camRes[hidden]{display:none}
.crHead{display:flex;align-items:center;gap:10px;padding:12px 16px;background:var(--card);border-bottom:1px solid var(--line)}
.crWho{flex:1;min-width:0}.crWho b{display:block;font-size:1.15rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.crWho small{color:var(--muted);font-size:.82rem}
.crScore{min-width:62px;height:62px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.5rem;font-weight:800;background:var(--ok-bg);color:var(--ok)}
.crScore.warn{background:var(--warn-bg);color:var(--warn)}.crScore.bad{background:var(--bad-bg);color:var(--bad)}
.crNote{padding:6px 16px 0;display:flex;flex-wrap:wrap;gap:6px;font-size:.8rem}
.crNote:empty{display:none}
.crTag{background:var(--warn-bg);color:var(--warn);border-radius:999px;padding:2px 9px;font-weight:600}
.crNoteTxt{color:var(--muted)}
.crImgWrap{flex:1;min-height:0;overflow:auto;padding:8px;background:var(--bg);-webkit-overflow-scrolling:touch}
.crImgWrap img{display:block;width:100%;max-width:520px;margin:0 auto;border-radius:10px;background:#fff}
.crBtns{display:flex;gap:8px;padding:10px 12px calc(10px + var(--safe-b));background:var(--card);border-top:1px solid var(--line)}
.crBtns:empty{display:none}
.crBtns .btn{flex:1;padding:14px 8px}
.crTimer{position:absolute;left:0;top:0;height:4px;width:100%;background:var(--brand);transform-origin:left;transform:scaleX(0)}
@keyframes crT{from{transform:scaleX(1)}to{transform:scaleX(0)}}
.crNoteTxt{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;flex-basis:100%}

/* ======================= Nhập đáp án bằng bảng ======================= */
.seg.slim button{padding:7px 0;font-size:.85rem;font-weight:600}
#keyGrid h4{margin:14px 0 6px;font-size:.95rem}

/* ===== v6: gọn giao diện ===== */
button.brand{appearance:none;background:none;border:0;padding:0;font:inherit;color:inherit;text-align:left;cursor:pointer}
.brand .caret{color:var(--muted);font-size:.9rem;margin-left:-4px}
.btn.bigcam{width:100%;padding:20px 10px;font-size:1.2rem;margin-bottom:10px}
.hero .btnrow{margin-top:0}
.sumRow{display:flex;align-items:center;justify-content:space-between;gap:10px}
details.acc{padding:0}
details.acc>summary{list-style:none;cursor:pointer;padding:14px 16px;font-weight:700;font-size:1.02rem;display:flex;align-items:center;gap:8px;min-height:48px}
details.acc>summary::-webkit-details-marker{display:none}
details.acc>summary::after{content:"▾";margin-left:auto;color:var(--muted);transition:transform .15s}
details.acc[open]>summary::after{transform:rotate(180deg)}
details.acc[open]>summary{border-bottom:1px solid var(--line)}
details.acc>*:not(summary){margin-left:16px;margin-right:16px}
details.acc>*:last-child{margin-bottom:14px}
details.acc>textarea,details.acc>select,details.acc>input[type=text]{width:calc(100% - 32px)}
details.acc>summary+*{margin-top:12px}
details.acc h4{margin:16px 16px 4px}
details.sub{margin:12px 0 0;border-top:1px dashed var(--line);padding-top:6px}
details.sub>summary{cursor:pointer;color:var(--brand);font-weight:600;padding:8px 0;font-size:.9rem}
.menuList{display:flex;flex-direction:column;gap:8px}
.menuItem{appearance:none;display:block;width:100%;text-align:left;background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:12px 14px;font:inherit;color:var(--ink);cursor:pointer;min-height:56px}
.menuItem b{display:block}.menuItem small{display:block;color:var(--muted);margin-top:2px}
.menuItem.off{opacity:.55}
.libTop{display:flex;gap:10px;flex-wrap:wrap}.libStat{margin:8px 0}
.libList{display:flex;flex-direction:column;gap:8px;margin-top:6px}
.libRow{position:relative;display:flex;flex-direction:column;gap:6px;background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:12px 44px 12px 14px;cursor:pointer}
.libRow.cur{border-color:var(--brand);background:var(--brand-soft)}
.libMain b{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.libMain small{color:var(--muted)}
.libTags{display:flex;gap:6px;flex-wrap:wrap}
.tg{font-size:.7rem;padding:2px 8px;border-radius:999px;background:var(--line);color:var(--muted)}
.tg.on{background:var(--brand);color:var(--brand-ink)}.tg.dr{background:var(--warn-bg);color:var(--warn)}
.libDel{position:absolute;right:6px;top:50%;transform:translateY(-50%);appearance:none;border:0;background:none;font-size:1.2rem;padding:10px;cursor:pointer}
#perfCard{padding:0}#perfCard>summary{font-weight:600;font-size:.9rem}

/* iOS tự phóng to trang khi chạm vào ô nhập có chữ < 16px → làm mọi thứ to hơn màn hình */
@media (pointer:coarse){input,select,textarea{font-size:16px !important}}
.cam{touch-action:none}.camRes{touch-action:pan-y}

/* Không phần tử nào được rộng hơn màn hình (iPhone sẽ nới cả trang ra rộng hơn màn hình nếu có 1 phần tử tràn) */
html,body{max-width:100%;overflow-x:hidden}
body{position:relative;overflow-wrap:anywhere}
body *{min-width:0;max-width:100%}
.cam,.cam *,.imgbox *,.cwrap *{max-width:none}
img,canvas,video,svg{max-width:100%}
.cam{left:0;right:0}
.dtools{display:flex;gap:6px;margin:0 0 10px}.dtools .btn{flex:1;padding:7px 4px;font-size:.82rem;border-radius:9px;min-height:0;white-space:nowrap}

/* sửa SBD: gợi ý học sinh còn thiếu bài */
.sbdName{margin-top:8px;font-weight:700;font-size:.95rem}.sbdName.ok{color:var(--ok)}.sbdName.bad{color:var(--bad)}
.chips{display:flex;flex-wrap:wrap;gap:6px;margin:6px 0 12px;max-height:210px;overflow:auto;-webkit-overflow-scrolling:touch}
.chip{border:1px solid var(--line);background:var(--card);color:var(--ink);border-radius:999px;padding:7px 11px;font:inherit;font-size:.85rem;text-align:left}
.chip b{color:var(--brand)}
.crDup{background:var(--bad-bg);color:var(--bad);flex-basis:100%;border-radius:10px;padding:8px 10px}
#resList{padding-bottom:96px}

/* ======================= v7: giao diện mới — menu trên cùng, mềm mại, hiện đại ======================= */
:root{--shadow:0 1px 2px rgba(15,23,42,.05),0 10px 24px -18px rgba(15,23,42,.35);--grad:linear-gradient(135deg,#0f766e 0%,#0d9488 60%,#14b8a6 100%);--radius:18px}
@media (prefers-color-scheme:dark){:root{--shadow:0 1px 2px rgba(0,0,0,.4);--grad:linear-gradient(135deg,#115e59 0%,#0f766e 100%)}}
body{padding-top:0;padding-bottom:calc(28px + var(--safe-b));background:var(--bg)}
.chrome{position:sticky;top:0;z-index:8;padding-top:var(--safe-t);background:var(--grad);box-shadow:0 8px 22px -14px rgba(15,23,42,.55)}
.topbar{position:static;background:none;border:0;padding:10px 16px 6px;color:#fff}
.topbar .brand{color:#fff}.topbar .brand .logo{color:#fff;font-size:1.5rem}.topbar .brand small{color:rgba(255,255,255,.82)}.topbar .brand .caret{color:rgba(255,255,255,.85)}
.topbar .chip{box-shadow:0 1px 0 rgba(0,0,0,.08)}
.tabbar{position:static;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:4px;padding:4px 10px 10px;background:none;border:0}
.tabbar button{position:relative;display:flex;flex-direction:column;align-items:center;gap:3px;padding:8px 2px 7px;border-radius:14px;background:rgba(255,255,255,.12);color:rgba(255,255,255,.88);font-size:.74rem;font-weight:600;min-height:54px;transition:background .15s,color .15s}
.tabbar button svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.tabbar button em{font-style:normal;line-height:1.1}
.tabbar button.active{background:#fff;color:var(--brand);font-weight:800;box-shadow:0 4px 12px -6px rgba(0,0,0,.5)}
@media (prefers-color-scheme:dark){.tabbar button.active{background:var(--card);color:var(--brand)}}
.tabbar .badge{top:3px;left:auto;right:12%;border:2px solid #0f766e}
main{padding:14px 14px 8px}
.card{border-radius:var(--radius);box-shadow:var(--shadow);border-color:transparent}
.card.hero{border:0;background:var(--card);padding:16px}
.btn{border-radius:14px;box-shadow:0 1px 0 rgba(15,23,42,.04)}
.btn.primary{background:var(--grad);border-color:transparent;box-shadow:0 8px 18px -10px rgba(15,118,110,.8)}
.btn.bigcam{padding:22px 10px;font-size:1.25rem;border-radius:18px;letter-spacing:.2px}
.btn.big{display:flex;flex-direction:column;align-items:center;gap:2px;border-radius:16px}
.toolbar{grid-template-columns:minmax(0,1fr) 112px auto;align-items:center}
.toolbar .btn{min-height:46px;padding:0 14px;white-space:nowrap}
.toolbar input,.toolbar select{min-height:46px;border-radius:12px;background:var(--card);box-shadow:var(--shadow)}
.row{border-radius:14px;border-left-width:6px;box-shadow:var(--shadow);border-top-color:transparent;border-right-color:transparent;border-bottom-color:transparent}
.row .sc{font-size:1.2rem}
.list{gap:10px}
.seg button{border-radius:12px;padding:10px 0;background:var(--card);box-shadow:var(--shadow);border-color:transparent}
.seg button.on{background:var(--grad);color:#fff}
.stseg{margin:0 0 12px;position:sticky;top:calc(var(--chrome-h,118px));z-index:4;background:var(--bg);padding:4px 0}
#resList{padding-bottom:12px}
details.acc>summary{font-size:1rem}
.ovbar{box-shadow:0 6px 16px -14px rgba(15,23,42,.6)}
.scorepill{background:var(--grad)}
.sheetbox{border-radius:22px 22px 0 0}

/* ----- khi trang đang chạy trên Netlify Drop: tấm biển «Powered by Netlify» nổi ở góc dưới bên phải → chừa chỗ ----- */
body.ext-badge{padding-bottom:calc(84px + var(--safe-b))}
.ext-badge .cam .camBot{padding-bottom:64px}
.ext-badge .camRes .crBtns{padding-bottom:calc(64px + var(--safe-b))}
.ext-badge .toast{bottom:calc(92px + var(--safe-b))}
.ext-badge .ovbody{padding-bottom:calc(84px + var(--safe-b))}
.ext-badge .sheetbox{padding-bottom:calc(72px + var(--safe-b))}
.ext-badge .btnrow.pad{padding-bottom:calc(64px + var(--safe-b))}
.ext-badge .camChip,.ext-badge .camCount{margin-bottom:0}

/* ===== Bảng nhập đáp án (v8): phản hồi tức thì, gọn, dễ nhìn ===== */
#keyGrid button,.kp button{touch-action:manipulation;-webkit-user-select:none;user-select:none;cursor:pointer}
.kgHead{display:flex;align-items:center;justify-content:space-between;margin:16px 0 6px}
.kgHead h4{margin:0;font-size:.95rem;letter-spacing:.1px}
.kgCnt{font-size:.78rem;font-weight:700;padding:2px 9px;border-radius:999px;background:var(--bg);color:var(--muted);border:1px solid var(--line);font-variant-numeric:tabular-nums;transition:background .2s,color .2s}
.kgCnt.full{background:var(--ok-bg);color:var(--ok);border-color:transparent}
.kgBar{height:4px;border-radius:4px;background:var(--line);overflow:hidden;margin-bottom:10px}
.kgBar i{display:block;height:100%;width:0;border-radius:4px;background:var(--grad,var(--brand));transition:width .25s ease}
.kgMcq{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:6px 12px}
.kgQ{display:flex;align-items:center;gap:8px;padding:4px 6px;border-radius:12px;transition:background .15s}
.kgQ.set{background:color-mix(in srgb,var(--brand-soft) 45%,transparent)}
.kgQ b{width:30px;height:30px;line-height:30px;border-radius:50%;text-align:center;font-size:.8rem;font-weight:700;color:var(--muted);background:var(--bg);flex:none;transition:background .15s,color .15s}
.kgQ.set b{background:var(--brand);color:var(--brand-ink)}
.kgOpts{display:flex;gap:8px;flex:1;justify-content:space-between}
.kgOpts button{width:42px;height:42px;border-radius:50%;border:1.5px solid var(--line);background:var(--card);color:var(--ink);font:inherit;font-weight:700;font-size:1rem;padding:0;
  transition:transform .12s ease,background .12s,border-color .12s,color .12s,box-shadow .12s}
.kgOpts button:active{transform:scale(.88)}
.kgOpts button.on{background:var(--brand);border-color:var(--brand);color:var(--brand-ink);box-shadow:0 3px 10px color-mix(in srgb,var(--brand) 40%,transparent);animation:kgPop .22s ease}
@keyframes kgPop{0%{transform:scale(.8)}60%{transform:scale(1.1)}100%{transform:scale(1)}}
.kgTf{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:10px}
.kgT{border:1px solid var(--line);border-radius:14px;padding:10px 12px;background:var(--card);transition:border-color .2s,background .2s}
.kgT.done{border-color:color-mix(in srgb,var(--ok) 55%,var(--line));background:color-mix(in srgb,var(--ok-bg) 35%,var(--card))}
.kgTh{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.kgTh b{font-size:.88rem}
.kgTh em{font-style:normal;font-weight:800;font-size:.8rem;color:var(--ok);opacity:0;transform:scale(.6);transition:opacity .2s,transform .2s}
.kgT.done .kgTh em{opacity:1;transform:none}
.kgTg{display:grid;grid-template-columns:1fr 1fr;gap:8px 10px}
.kgI{display:flex;align-items:center;gap:6px;min-width:0}
.kgI i{font-style:normal;font-weight:700;font-size:.8rem;color:var(--muted);width:16px;text-align:center;flex:none}
.kgPill{display:flex;flex:1;background:var(--bg);border-radius:999px;padding:3px;gap:3px;min-width:0}
.kgPill button{flex:1;min-width:0;height:36px;border:0;border-radius:999px;background:transparent;color:var(--muted);font:inherit;font-weight:700;padding:0;
  transition:background .14s,color .14s,transform .12s,box-shadow .14s}
.kgPill button:active{transform:scale(.92)}
.kgPill button.on.t{background:var(--ok);color:#fff;box-shadow:0 2px 8px color-mix(in srgb,var(--ok) 40%,transparent)}
.kgPill button.on.f{background:var(--bad);color:#fff;box-shadow:0 2px 8px color-mix(in srgb,var(--bad) 40%,transparent)}
.kgSh{display:grid;grid-template-columns:repeat(auto-fill,minmax(104px,1fr));gap:10px}
.kgS{display:flex;flex-direction:column;align-items:center;gap:2px;padding:10px 6px;border-radius:14px;border:1.5px dashed var(--line);background:var(--card);color:var(--ink);font:inherit;
  transition:transform .12s,border-color .15s,background .15s}
.kgS:active{transform:scale(.95)}
.kgS b{color:var(--muted);font-size:.74rem;font-weight:600}
.kgS span{font-weight:800;font-size:1.25rem;color:var(--line);min-height:1.5em;line-height:1.5}
.kgS.has{border:1.5px solid var(--brand);background:color-mix(in srgb,var(--brand-soft) 45%,var(--card))}
.kgS.has span{color:var(--ink)}
/* bàn phím số */
.sheet:not([hidden]){animation:kgFade .18s ease}
.sheet:not([hidden]) .sheetbox.kp{animation:kgUp .24s cubic-bezier(.2,.8,.2,1)}
@keyframes kgFade{from{opacity:0}to{opacity:1}}
@keyframes kgUp{from{transform:translateY(40px);opacity:.6}to{transform:none;opacity:1}}
.sheetbox.kp{max-width:400px;padding-top:12px}
.kpTop{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}
.kpTop b{font-size:.95rem}
.kpNav{width:42px;height:42px;border-radius:50%;border:1px solid var(--line);background:var(--bg);color:var(--ink);font-size:1.5rem;line-height:1;padding:0 0 3px}
.kpDisp{margin:4px 0 2px;padding:10px;border-radius:16px;background:var(--bg);text-align:center;font-size:2.2rem;font-weight:800;letter-spacing:4px;min-height:68px;display:flex;align-items:center;justify-content:center;font-variant-numeric:tabular-nums}
.kpDisp.empty{color:var(--line)}
.kpHint{text-align:center;min-height:1.3em;margin:4px 0 8px;font-size:.76rem;color:var(--muted)}
.kpGrid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.kpGrid button{height:54px;font-size:1.4rem;font-weight:700;border-radius:16px;border:1px solid var(--line);background:var(--card);color:var(--ink);padding:0;
  transition:transform .1s,background .1s}
.kpGrid button:active:not(:disabled){transform:scale(.94);background:var(--brand-soft)}
.kpGrid button:disabled{opacity:.28}
.kpRow{display:grid;grid-template-columns:1fr 1fr 1.6fr;gap:8px;margin-top:10px}
.kpAct{height:50px;border-radius:16px;border:1px solid var(--line);background:var(--bg);color:var(--ink);font:inherit;font-weight:700;padding:0;transition:transform .1s}
.kpAct:active{transform:scale(.95)}
.kpAct.main{background:var(--grad,var(--brand));background-color:var(--brand);color:var(--brand-ink);border-color:transparent}
@media(prefers-reduced-motion:reduce){#keyGrid *,.kp,.kp *,.sheet{animation:none!important;transition:none!important}}

.aboutFoot{margin:18px 4px 8px;font-size:.75rem;color:var(--muted);text-align:center;line-height:1.5}.aboutFoot a{color:var(--muted)}