html{color-scheme:dark}
:root{--panel:#3d3a78;--deep:#14122b;--deepa:#14122bee;--line:#4a4690;--line2:#5a56a8;--sel:#5b57b5;--badbg:#7a1f2b;--okbg:#1f6f43;--accink:var(--acc);
--bg:#1d1b3a;--card:#2b2858;--ink:#f4f3ff;--mute:#a9a6d6;--acc:#ffcc33;--ok:#2ecc71;--bad:#ef4444;
--c0:#e21b3c;--c1:#1368ce;--c2:#d89e00;--c3:#26890c}
*{box-sizing:border-box}
body{margin:0;font:16px/1.45 system-ui,sans-serif;background:var(--bg);color:var(--ink)}
.logo{color:var(--accink);font-weight:700;text-decoration:none;font-size:20px}
main{max-width:min(1400px,100%);margin:0 auto;padding:20px}
.card{background:var(--card);border-radius:14px;padding:20px;margin-bottom:16px}
h1,h2{margin:.2em 0 .5em}
.mute{color:var(--mute)}
button,.btn{font:inherit;font-weight:600;border:0;border-radius:10px;padding:10px 18px;background:var(--acc);color:#222;cursor:pointer}
button.sec{background:var(--panel);color:var(--ink)}
button:disabled{opacity:.5;cursor:default}
input,textarea{font:inherit;width:100%;padding:9px 12px;border-radius:8px;border:2px solid var(--line);background:var(--bg);color:var(--ink)}
.drop{border:3px dashed var(--line2);border-radius:14px;padding:40px;text-align:center;cursor:pointer}
.drop.over{border-color:var(--acc);background:#2f2c63}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.grow{flex:1}
.modes{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:12px}
.mode{background:var(--panel);color:var(--ink);padding:18px;text-align:left}
.mode b{display:block;font-size:18px}.mode span{font-weight:400;color:var(--mute);font-size:14px}
.qedit{border-left:5px solid var(--ok)}.qedit.warn{border-color:var(--bad)}
.opt{display:flex;gap:8px;align-items:center;margin:6px 0}
.opt input[type=radio]{width:auto}
.answers{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media(max-width:600px){.answers{grid-template-columns:1fr}}
.ans{min-height:80px;font-size:18px;color:#fff;text-align:left;border-radius:12px}
.ans:nth-child(1){background:var(--c0)}.ans:nth-child(2){background:var(--c1)}
.ans:nth-child(3){background:var(--c2)}.ans:nth-child(4){background:var(--c3)}
.ans:nth-child(n+5){background:#6b46c1}
.ans.right{outline:5px solid var(--ok)}.ans.wrong{opacity:.35}
.qtext{font-size:24px;font-weight:700;margin:10px 0 18px}
.bar{height:10px;background:var(--deep);border-radius:6px;overflow:hidden}
.bar>i{display:block;height:100%;background:var(--acc);transition:width .2s linear}
.stats{display:flex;justify-content:space-between;color:var(--mute);margin-bottom:8px}
.code{font-size:64px;font-weight:800;letter-spacing:8px;color:var(--accink);text-align:center}
.chips{display:flex;flex-wrap:wrap;gap:8px}.chip{background:var(--panel);padding:6px 12px;border-radius:20px}
.lb{width:100%;border-collapse:collapse}.lb td{padding:8px;border-bottom:1px solid var(--line)}.lb td:last-child{text-align:right}
.flash{perspective:900px;height:260px;cursor:pointer;margin-bottom:14px}
.flash>div{position:relative;height:100%;transition:transform .5s;transform-style:preserve-3d}
.flash.flip>div{transform:rotateY(180deg)}
.flash .f{position:absolute;inset:0;backface-visibility:hidden;display:flex;align-items:center;justify-content:center;text-align:center;padding:24px;border-radius:14px;background:var(--card);font-size:22px;font-weight:600}
.flash .b{transform:rotateY(180deg);background:var(--okbg)}
canvas{width:100%;max-width:520px;display:block;margin:0 auto;border-radius:12px;background:#0f0d24;touch-action:none}
.center{text-align:center}.big{font-size:44px}
.fb{font-size:22px;font-weight:700;margin:10px 0}.ok{color:var(--ok)}.bad{color:var(--bad)}
.btn{text-decoration:none;display:inline-block}.btn.sec{background:var(--panel);color:var(--ink)}
.qimg{max-width:100%;max-height:260px;border-radius:6px;background:#fff;vertical-align:middle}
.ans .qimg,.block .qimg{max-height:90px}
.expl{margin-top:12px;padding:12px 14px;background:var(--deep);border-left:4px solid var(--acc);border-radius:8px;font-weight:400}
.expl b{color:var(--accink)}
.preview{margin:4px 0 8px;padding:8px 12px;background:var(--deep);border-radius:8px;font-size:15px}
.arena{position:relative;height:560px;max-width:520px;margin:0 auto;overflow:hidden;border-radius:12px;background:#0f0d24;touch-action:none}
.block{position:absolute;top:0;height:120px;padding:8px;color:#fff;font-weight:600;font-size:14px;text-align:center;border-radius:10px;overflow:hidden;will-change:transform}
.ship{position:absolute;bottom:20px;font-size:38px;transition:left .08s;transform:translateX(-50%);line-height:1}
.hud{position:absolute;top:6px;left:10px;right:10px;display:flex;justify-content:space-between;font-weight:700;z-index:2}
.flashfx{position:absolute;inset:0;pointer-events:none;opacity:0}
textarea.small{min-height:60px}
.imgbox{display:inline-block;position:relative;vertical-align:middle;margin:2px}
.imgtools{position:absolute;top:-9px;right:-9px;display:flex;gap:3px;opacity:0;pointer-events:none;transition:opacity .12s}
.imgbox:hover .imgtools,.imgbox:focus-within .imgtools{opacity:1;pointer-events:auto}
.imgtools button{width:20px;height:20px;padding:0;font-size:12px;line-height:20px;border-radius:50%;box-shadow:0 1px 4px #0008}
.imgtools .del:hover{background:var(--bad)}
button.tiny{padding:3px 10px;font-size:12px;font-weight:500}
.tools{margin-top:4px}
.mgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:10px}
.mcard{min-height:80px;background:var(--panel);color:var(--ink);border:3px solid transparent;font-weight:500;text-align:center}
.mcard.q{border-color:#1368ce}.mcard.a{border-color:#26890c}
.mcard.sel{background:var(--sel);border-color:var(--acc)}
.mcard.done{opacity:.25;pointer-events:none}
.mcard.bad{background:var(--badbg);animation:shake .4s}
@keyframes shake{25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}
.shake{animation:shake .4s}
.tfcard{background:var(--deep);border-radius:12px;padding:18px;margin:14px 0}
.tfans{font-size:20px;padding:10px 12px;background:var(--card);border-radius:8px}
.tfrow{justify-content:center;gap:16px}
.tfbtn{font-size:20px;padding:14px 30px;color:#fff}.tfbtn.yes{background:var(--c3)}.tfbtn.no{background:var(--c0)}
.bossrow{display:flex;gap:14px;align-items:center;margin-bottom:10px}
.boss{font-size:64px;line-height:1;transition:transform .15s}.boss.hit{animation:shake .4s;filter:hue-rotate(90deg)}
.hpbar{height:16px;background:var(--deep);border-radius:8px;overflow:hidden}.hpbar>i{display:block;height:100%;background:#ef4444;transition:width .5s}
.lane{display:flex;align-items:center;gap:8px;margin:8px 0}.lname{width:64px;font-size:13px;color:var(--mute)}
.track{position:relative;flex:1;height:38px;background:var(--deep);border-radius:8px}
.car{position:absolute;top:2px;font-size:28px;transition:left .5s}.flag{position:absolute;right:6px;top:4px;font-size:24px}
.qimg.wait{opacity:.35;min-width:56px;min-height:24px;background:#ddd}
.millwrap{display:grid;grid-template-columns:1fr 230px;gap:14px;align-items:start}
@media(max-width:700px){.millwrap{grid-template-columns:1fr}}
.mq{background:linear-gradient(#1a1650,#0e0b33);border:2px solid #6c63ff;border-radius:40px;padding:16px 24px;text-align:center}
.ans.mil{border-radius:30px;border:2px solid #6c63ff;background:linear-gradient(#1a1650,#0e0b33)!important;font-size:17px}
.ans.mil:hover:not(:disabled){border-color:var(--acc)}
.ans.mil.picked{background:#c77b00!important;color:#fff}
.ans.mil.right{background:var(--c3)!important;outline:none;border-color:#fff;opacity:1}
.ans.mil.wrongpick{background:var(--c0)!important;opacity:1}
.lifes{display:flex;gap:10px;justify-content:center;margin:6px 0 10px}
.life{border-radius:50%;width:56px;height:56px;padding:0;background:#1a1650;color:var(--acc);border:2px solid var(--acc);font-size:16px}
.life.used{opacity:.3;text-decoration:line-through}
.ladder{display:flex;flex-direction:column;gap:3px;font-size:13px}
.rung{display:flex;justify-content:space-between;padding:3px 10px;border-radius:6px;color:var(--accink)}
.rung.safe{color:#fff;font-weight:700}.rung.passed{opacity:.4}.rung.now{background:#c77b00;color:#fff;font-weight:700}
.aud{display:flex;gap:18px;align-items:flex-end;justify-content:center;height:130px;margin-top:8px}
.audcol{display:flex;flex-direction:column;align-items:center;justify-content:flex-end}
.audbar{width:30px;background:linear-gradient(#ffcc33,#c77b00);border-radius:4px 4px 0 0;min-height:2px}
.pond{position:relative;height:440px;overflow:hidden;border-radius:12px;background:linear-gradient(#9be0ff 0 44px,#2a9bd8 44px,#1366a8 55%,#08224f);margin:10px 0}
.boat{position:absolute;top:2px;left:50%;transform:translateX(-50%);font-size:40px;line-height:1}
.fline{display:none;position:absolute;width:2px;background:#fff;transform-origin:top center;z-index:2}
.fish{position:absolute;left:0;z-index:1;display:flex;align-items:center;gap:6px;max-width:260px;min-height:50px;padding:6px 14px 6px 8px;border-radius:30px;background:#fffffff0;border:3px solid var(--c,#ff9f43);color:#222;font-weight:600;font-size:15px;cursor:pointer;box-shadow:0 2px 6px #0006;will-change:transform}
.fish:hover{filter:brightness(1.08);box-shadow:0 0 0 3px #fff8,0 2px 8px #0008}.csvg svg{display:block;width:60px;height:45px;overflow:visible}
.fhead{display:flex;line-height:0;filter:drop-shadow(0 2px 2px #0005);animation:fbob 1.4s ease-in-out infinite alternate}@keyframes fbob{to{translate:0 -4px}}.fbody{overflow:hidden;text-align:center}
.fish .qimg{max-height:56px}
.fish.right{outline:4px solid var(--ok)}.fish.caught{background:var(--ok);outline:4px solid #fff}.fish.wrong{background:var(--bad);color:#fff}
.mtime{font-weight:800;font-size:26px;line-height:1;color:var(--accink);background:var(--deep);border:3px solid var(--acc);border-radius:30px;padding:4px 16px}.mtime.low{color:#fff;background:var(--bad);border-color:var(--bad);animation:pulse .6s infinite alternate}
@keyframes pulse{to{transform:scale(1.12)}}
.mbar{margin:4px 0 8px}.mbar>i.low{background:var(--bad)}
.qimg.sized{max-height:none;vertical-align:middle;padding:0 1px;border-radius:2px}
.qimg.sized.wait{width:2em}
.music{display:none}body.playing .music{display:flex}.music{align-items:center;gap:6px}.musicbtn{padding:2px 8px;background:var(--panel);color:var(--ink);font-size:16px}.musicvol{width:80px;padding:0;accent-color:var(--acc)}
#exitbar{max-width:min(1400px,100%);margin:10px auto 0;padding:0 20px;display:flex;align-items:center;gap:10px}#exitbar button{padding:6px 14px;font-size:14px}
/* ---- Lớp học: màn hình giáo viên (chiếu lên máy chiếu) ---- */
.joinbox{display:flex;gap:28px;align-items:center;justify-content:center;flex-wrap:wrap}
.qr{width:200px;height:200px;border-radius:12px;background:#fff}
.chip.off{opacity:.45}.chip .x{padding:0 0 0 8px;background:none;color:var(--mute);font-size:13px}.chip .x:hover{color:var(--bad)}
.big-q .qtext{font-size:30px}.big-q .ans{font-size:22px}
.dist{display:flex;gap:18px;align-items:flex-end;justify-content:center;height:170px;margin:10px 0}
.distcol{display:flex;flex-direction:column;align-items:center;justify-content:flex-end;gap:4px;min-width:60px;font-size:20px}
.distbar{width:56px;min-height:0!important;border-radius:8px 8px 0 0;outline-offset:2px}
.distbar.c0{background:var(--c0)}.distbar.c1{background:var(--c1)}.distbar.c2{background:var(--c2)}.distbar.c3{background:var(--c3)}
.help{margin:8px 0;padding:8px 12px;background:var(--deep);border-radius:8px}
.hardq{padding:6px 0;border-bottom:1px solid var(--line)}
.tblwrap{overflow-x:auto}.rep th{text-align:left;padding:6px 8px;color:var(--mute)}.rep td{text-align:left!important}
.marks{white-space:nowrap}.mk{display:inline-block;width:22px;text-align:center;font-weight:700}.mk.ok{color:var(--ok)}.mk.bad{color:var(--bad)}
@media(max-width:600px){.big-q .qtext{font-size:22px}}
.mode.pick{display:block;cursor:pointer}.mode.pick input{float:right}
/* ---- Tài khoản ---- */
footer{text-align:center;padding:20px;font-size:13px}footer a{color:var(--mute)}
a{color:var(--accink)}
select{font:inherit;padding:8px 10px;border-radius:8px;border:2px solid var(--line);background:var(--bg);color:var(--ink)}
.prog th{text-align:center;font-size:12px;white-space:nowrap}.prog th:first-child,.prog td:first-child{text-align:left;position:sticky;left:0;background:var(--card)}
.cell{text-align:center!important;font-weight:700;min-width:54px}.cell.hi{color:var(--ok)}.cell.mid{color:var(--accink)}.cell.lo{color:var(--bad)}.cell.none{color:var(--mute);font-weight:400}.cell.avg{border-left:2px solid var(--line)}
.prog th .gtitle{max-width:110px;white-space:normal;line-height:1.2;margin:0 auto}
.card:empty{display:none}
/* ---- Bài kiểm tra ---- */
.examhead{position:sticky;top:0;z-index:5;display:flex;gap:14px;align-items:center;background:var(--deep);border:2px solid var(--line)}
.examopts{display:grid;gap:10px}
.exopt{text-align:left;background:var(--panel);color:var(--ink);font-weight:500;border:3px solid transparent;border-radius:12px;padding:12px 16px}
.exopt.on{background:var(--sel);border-color:var(--acc)}
.rules{text-align:left;max-width:520px;margin:12px auto;color:var(--mute)}
[hidden]{display:none!important}
.planbadge{background:var(--acc);color:#222;font-weight:700;padding:4px 14px;border-radius:20px}
.usage{margin:10px 0}.plans th.cur,.plans td.cur{background:var(--panel)}.plans td:not(:first-child),.plans th:not(:first-child){text-align:center!important}
.planbadge.small{font-size:12px;padding:1px 10px;margin-left:8px}.planbadge.bad{background:var(--bad);color:#fff}
.sharebox{margin-top:6px}
.exfill{font-size:18px;padding:12px 14px}
.tabs{margin-bottom:12px}.planbadge.off{background:var(--panel);color:var(--ink)}.statcard .big{color:var(--accink);font-weight:800}
.planbox{text-align:center}.planbox.hot{border:2px solid var(--acc)}.price{font-size:26px;font-weight:800;color:var(--accink);margin-top:6px}
.feat{list-style:none;padding:0;text-align:left;margin:14px 0}.feat li{padding:5px 0;border-bottom:1px solid var(--line)}
.planedit{display:grid;grid-template-columns:repeat(auto-fit,minmax(340px,1fr));gap:14px}.fld{margin:6px 0}.fld input{text-align:right}
.fld input:not([type=number]){text-align:left;max-width:220px}.fld small{width:104px;text-align:left}

/* ---- Thanh đầu trang ---- */
header{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:10px 20px;background:var(--deep);position:relative}
.logo{white-space:nowrap}
header nav{display:flex;align-items:center;gap:2px;flex:1;margin-left:10px;flex-wrap:wrap;min-width:0}
header nav a{color:var(--ink);text-decoration:none;font-size:14px;padding:7px 8px;border-radius:8px;white-space:nowrap}
header nav a:hover{background:var(--card)}
header nav a.on{background:var(--card);color:var(--accink);font-weight:600}
header nav a.cta{background:var(--acc);color:#222;font-weight:700}
header nav .acct{margin-left:auto;display:flex;align-items:center;gap:8px}
header nav .who{color:var(--mute)}
.tools{display:flex;align-items:center;gap:6px}
.burger{display:none;padding:0;width:44px;height:44px;font-size:22px;background:var(--panel);color:var(--ink);line-height:1}
body.student header nav,body.student .burger{display:none}
footer #ver{color:var(--mute);font-size:11px}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--acc);outline-offset:2px}

/* Menu gọn trên màn hình hẹp: nút ☰ mở danh sách mục lớn, dễ chạm */
@media (max-width:1100px){
  .burger{display:inline-flex;align-items:center;justify-content:center}
  .logo{flex:1}
  header nav{display:none;order:10;flex:none;width:100%;margin:4px 0 0;flex-direction:column;align-items:stretch;gap:0;border-top:1px solid var(--card);padding-top:4px}
  header nav.open{display:flex}
  header nav a{padding:14px 10px;font-size:16px;border-radius:8px}
  header nav .acct{margin:6px 0 0;padding-top:10px;border-top:1px solid var(--card);justify-content:space-between}
  header nav .acct a{flex:1}
  header nav .acct button{padding:10px 16px;font-size:14px}
  header nav a.cta{text-align:center}
}

/* ---- Điện thoại ---- */
@media (max-width:720px){
  header{padding:8px 12px}
  .logo{font-size:17px}
  .musicvol{display:none}
  .musicbtn{width:44px;height:44px;font-size:18px}
  main{padding:12px}
  .card{padding:14px;border-radius:12px;margin-bottom:12px}
  h1{font-size:24px}h2{font-size:20px}h3{font-size:17px}
  button:not(.tiny):not(.x):not(.musicbtn):not(.burger),.btn{min-height:44px}
  .row{gap:8px}
  .row>input,.row>select,.row>textarea{min-width:0}
  .card.row>div.grow{flex-basis:100%}
  .row>select{flex:1 1 170px}
  .plangrid{grid-template-columns:1fr}
  .modes{grid-template-columns:1fr 1fr;gap:8px}
  .mode{padding:12px}.mode b{font-size:16px}.mode span{font-size:13px}
  .code{font-size:42px;letter-spacing:5px}
  .joinbox{gap:12px}.qr{width:170px;height:170px}
  .qtext{font-size:20px}.big-q .qtext{font-size:22px}.big-q .ans{font-size:18px}
  .ans{min-height:64px;font-size:17px}
  .dist{gap:10px;height:150px}.distcol{min-width:44px;font-size:17px}.distbar{width:44px}
  .tabs{flex-wrap:nowrap;overflow-x:auto;-webkit-overflow-scrolling:touch;padding-bottom:4px}.tabs button{white-space:nowrap;flex:none}
  .planedit{grid-template-columns:1fr}
  .fld{flex-wrap:nowrap}.fld .grow{flex-basis:auto}
  #exitbar{padding:0 12px;margin-top:8px}
  .examhead{padding:10px 12px;gap:8px;flex-wrap:wrap}
  .prog th:first-child,.prog td:first-child{max-width:110px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
}
@media (max-width:380px){.logo span{display:none}.modes{grid-template-columns:1fr}}
input[type=checkbox],input[type=radio]{width:auto;padding:0;accent-color:var(--acc);flex:none}
.plangrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:14px;align-items:start}
@media (max-width:1240px){.musicvol{display:none}}

/* ---- Công cụ vẽ trên màn hình ---- */
/* ghi đè luật `canvas` chung của các game (rộng tối đa 520px, căn giữa, nền tối) */
canvas.ink{position:fixed;inset:0;z-index:900;pointer-events:none;touch-action:none;display:block;max-width:none;margin:0;border-radius:0;background:transparent}
canvas.ink.live{pointer-events:auto}
canvas.ink.board-white{background:#fff}canvas.ink.board-black{background:#14141c}
canvas.ink.board-grid{background-color:#fff;background-image:linear-gradient(#c9d6ea 1px,transparent 1px),linear-gradient(90deg,#c9d6ea 1px,transparent 1px);background-size:32px 32px}
.inkbar{position:fixed;left:0;right:0;margin:0 auto;width:max-content;bottom:10px;z-index:910;max-width:calc(100vw - 16px);background:var(--deepa);border:2px solid var(--line);border-radius:16px;padding:8px 10px;box-shadow:0 6px 24px #000a;backdrop-filter:blur(6px)}
.inkbar.top{bottom:auto;top:10px}.inkbar[hidden]{display:none!important}
.ik-row{display:flex;align-items:center;gap:4px;flex-wrap:wrap;justify-content:center}.ik-row+.ik-row{margin-top:6px}
.ik-sep{width:1px;height:26px;background:var(--line);margin:0 4px}
.ib{padding:0;min-width:40px;height:40px;background:var(--card);color:var(--ink);font-size:18px;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;line-height:1}
.ib.wide{padding:0 10px;font-size:14px;min-width:0}.ib.on{background:var(--acc);color:#222}
.ib:disabled{opacity:.35}
.ib.sz i{display:block;background:currentColor;border-radius:50%}
.sw{width:30px;height:30px;padding:0;border-radius:50%;border:3px solid var(--deep);box-shadow:0 0 0 1px #6c63ff;cursor:pointer;display:inline-block;position:relative}
.sw.on{box-shadow:0 0 0 3px var(--acc);transform:scale(1.12)}
.sw.custom{background:conic-gradient(red,yellow,lime,aqua,blue,magenta,red);overflow:hidden}.sw.custom input{position:absolute;inset:0;opacity:0;width:100%;height:100%;padding:0;cursor:pointer}
.ink-text{position:fixed;z-index:920;background:#0009;border:2px dashed var(--acc);border-radius:6px;padding:2px 6px;min-width:180px;width:auto;font-weight:600}
.inkbtn.on{background:var(--acc);color:#222}
body.student #inkbtn,body.student canvas.ink,body.student .inkbar{display:none!important}
@media (max-width:720px){.ib{min-width:36px;height:36px;font-size:16px}.sw{width:26px;height:26px}.inkbar{padding:6px}}

/* ---- Game trình chiếu (toàn khung, chữ lớn) ---- */
body.stage header,body.stage footer,body.stage #exitbar{display:none}
body.stage main{max-width:none;padding:0}
.sg{min-height:100vh;display:flex;flex-direction:column;gap:clamp(10px,1.6vw,22px);padding:clamp(12px,2.2vw,32px);padding-top:clamp(52px,5vw,64px);position:relative}
.stagebar{position:fixed;top:8px;right:8px;z-index:800;display:flex;gap:6px}.stagebar button{width:44px;height:44px;padding:0;font-size:18px}
.sg-top{display:flex;align-items:center;gap:14px;flex-wrap:wrap}.sg-count{font-size:clamp(16px,1.8vw,24px);font-weight:700;color:var(--accink);white-space:nowrap}
.sg-prog{flex:1;min-width:80px;height:10px;background:var(--deep);border-radius:6px;overflow:hidden}.sg-prog i{display:block;height:100%;background:var(--acc);transition:width .25s}
.sg-main{flex:1}.sg-body{display:flex;flex-direction:column;gap:clamp(12px,2vw,28px)}
.sg-q{font-size:clamp(26px,4.4vw,68px);font-weight:800;line-height:1.25}
.sg-q .qimg{max-height:34vh}
.sg-opts{display:grid;grid-template-columns:1fr 1fr;gap:clamp(8px,1.4vw,20px)}
.sg-opt{border-radius:18px;padding:clamp(12px,2vw,28px);font-size:clamp(20px,3vw,46px);font-weight:700;color:#fff;transition:opacity .25s,transform .25s;display:flex;align-items:center}
.sg-opt:nth-child(1){background:var(--c0)}.sg-opt:nth-child(2){background:var(--c1)}.sg-opt:nth-child(3){background:var(--c2)}.sg-opt:nth-child(4){background:var(--c3)}.sg-opt:nth-child(n+5){background:#6b46c1}
.sg-opt.right{outline:6px solid #fff;transform:scale(1.02)}.sg-opt.dim{opacity:.22}
.sg-fill{border:4px dashed var(--line2);border-radius:18px;padding:clamp(16px,2.6vw,40px);font-size:clamp(24px,4vw,60px);font-weight:800;text-align:center}.sg-fill small{display:block;font-size:.4em;color:var(--mute);font-weight:500;margin-bottom:6px}
.sg-fill.show{border:4px solid var(--ok);color:#b9ffd0;background:#14341f}
.sg-expl{font-size:clamp(18px,2.2vw,32px);padding:14px 18px;background:var(--deep);border-left:6px solid var(--acc);border-radius:10px}
.sg-ctl{display:flex;gap:12px;align-items:center;justify-content:center;flex-wrap:wrap}.sg-ctl button{font-size:clamp(16px,1.6vw,22px);padding:12px 24px}
.sg-hint{text-align:center;font-size:13px}
.sg-end,.sg-setup{align-items:center;justify-content:center;text-align:center}.sg-setup .card{width:min(560px,100%);text-align:left}
.tm{display:flex;align-items:center;gap:8px}.tm-show{font-size:clamp(22px,2.6vw,38px);font-weight:800;min-width:92px;text-align:center;color:var(--accink);background:var(--deep);border:3px solid var(--acc);border-radius:30px;padding:2px 16px}
.tm-show.low{background:var(--bad);color:#fff;border-color:var(--bad);animation:pulse .5s infinite alternate}.tm-show.end{background:var(--badbg);color:#fff;border-color:var(--bad)}
.tm select{width:auto;padding:6px 8px}.tm button{width:44px;height:44px;padding:0}
/* ô bí mật */
.bx-score{display:flex;gap:10px;flex-wrap:wrap;justify-content:center}
.bx-team{min-width:140px;background:var(--deep);border:4px solid;border-radius:16px;padding:8px 14px;text-align:center}.bx-tn{font-weight:700}.bx-pt{font-size:clamp(28px,3.4vw,48px);font-weight:800;color:var(--accink);line-height:1.1}.bx-adj{display:flex;gap:6px;justify-content:center}.bx-adj button{width:34px;height:28px}
.bx-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(clamp(84px,11vw,150px),1fr));gap:clamp(8px,1.2vw,16px);flex:1;align-content:start}
.bx-box{aspect-ratio:1.15;font-size:clamp(28px,4vw,60px);font-weight:800;color:#fff;background:linear-gradient(145deg,#6c63ff,var(--panel));border:4px solid #8f88ff;border-radius:18px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;transition:transform .15s}
.bx-box:hover:not(:disabled){transform:scale(1.06)}.bx-box.done{background:var(--deep);color:#6a67a8;border-width:4px}.bx-box small{font-size:13px;font-weight:600}
.bx-award{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;align-items:center}.bx-award button{font-size:clamp(16px,1.8vw,24px);padding:14px 22px}
.bx-dot{width:18px;height:18px;border-radius:50%;flex:none}.bx-names{display:grid;gap:8px}
.bx-final{display:grid;gap:10px;width:min(520px,100%);margin:10px auto}.bx-frow{display:flex;justify-content:space-between;background:var(--deep);border-left:10px solid;border-radius:12px;padding:14px 18px;font-size:clamp(18px,2.4vw,30px)}
/* vòng quay */
.wh-grid{display:grid;grid-template-columns:auto 1fr;gap:clamp(12px,2vw,32px);align-items:start}
.wh-stage{display:flex;flex-direction:column;align-items:center;gap:10px}.wh-canvas{display:block;max-width:100%;background:none;border-radius:50%;box-shadow:0 8px 30px #0008}
.wh-spin{font-size:clamp(20px,2.4vw,30px);padding:14px 40px}.wh-panel{display:flex;flex-direction:column;gap:12px;min-width:0}.wh-side{display:flex;flex-direction:column;gap:8px}
.wh-name{font-size:clamp(30px,5vw,72px);font-weight:800;color:var(--accink);text-align:center;margin:6px 0}.wh-result{min-height:60px}.wh-q{display:flex;flex-direction:column;gap:12px}
@media (max-width:900px){.wh-grid{grid-template-columns:1fr}.sg-opts{grid-template-columns:1fr}.sg{padding-top:56px}}
.sw,.ib,.ik-sep{flex:none}
@media (max-width:720px){.ib{min-width:34px;height:36px}.sw{width:24px;height:24px}.ik-sep{display:none}.ik-row{gap:3px}}
.inkbar button{min-height:0!important}

/* đối kháng + triệu phú trên màn hình lớn */
.dl-score{display:grid;grid-template-columns:1fr 1fr;gap:clamp(8px,1.6vw,24px)}
.dl-team{background:var(--deep);border:5px solid;border-radius:20px;padding:10px 16px;text-align:center;display:flex;flex-direction:column;align-items:center;gap:4px;transition:transform .15s,box-shadow .15s}
.dl-team.hot{transform:scale(1.03);box-shadow:0 0 0 6px #fff4,0 0 30px var(--acc)}
.dl-team .bx-tn{font-size:clamp(18px,2.2vw,32px)}.dl-team .bx-pt{font-size:clamp(40px,6vw,92px)}
.dl-buzz{width:100%;font-size:clamp(20px,2.6vw,36px);padding:14px;color:#fff;border-radius:16px}
.dl-status{text-align:center;font-size:clamp(20px,2.6vw,38px);font-weight:700;padding:12px;border-radius:14px;border:4px dashed var(--line2)}
.dl-status.hot{border-style:solid;background:var(--deep)}
body.stage .millwrap{padding:clamp(12px,2vw,28px);padding-top:56px;min-height:100vh;grid-template-columns:1fr clamp(220px,22vw,340px)}
body.stage .mq{font-size:clamp(20px,2.8vw,44px);padding:clamp(14px,2vw,28px)}
body.stage .ans.mil{font-size:clamp(16px,2.2vw,32px);min-height:clamp(64px,10vh,110px)}
body.stage .ladder{font-size:clamp(12px,1.4vw,20px)}
body.stage .life{width:clamp(56px,6vw,84px);height:clamp(56px,6vw,84px)}


[data-mode=light]{color-scheme:light;--g1:#e3dcff;--g2:#d7e8ff;--brand:#5b4bdb;--brand2:#7c5cf0;--brand3:#b04fe0;--bg:#f6f7fc;--card:#fff;--ink:#1b1f3b;--mute:#6b7194;--acc:#f5b301;--accink:#a15c07;--ok:#12a150;--bad:#e03146;
--panel:#eef0fb;--deep:#f3f4fc;--deepa:#ffffffe6;--line:#dfe2f3;--line2:#c3c9ec;--sel:#dfe4ff;--badbg:#ffe1e5;--okbg:#d3f5e1;
--shadow:0 1px 2px #1b1f3b0d,0 8px 24px -8px #3b3f8f26;
--c0:#e5384f;--c1:#3b6fe0;--c2:#e9a20b;--c3:#1fa563}
[data-mode=light] body{background:radial-gradient(900px 420px at 85% -80px,var(--g1) 0,transparent 70%),radial-gradient(700px 380px at -5% -60px,var(--g2) 0,transparent 70%),var(--bg) fixed;letter-spacing:.005px}
[data-mode=light] header{background:#ffffffcc;backdrop-filter:saturate(1.6) blur(14px);border-bottom:1px solid var(--line);box-shadow:0 1px 0 #fff inset,0 4px 20px -10px #3b3f8f33;position:sticky;top:0;z-index:50}
[data-mode=light] .logo{background:linear-gradient(90deg,var(--brand),var(--brand3));-webkit-background-clip:text;background-clip:text;color:transparent}
[data-mode=light] header nav a{color:#454b78}
[data-mode=light] header nav a:hover{background:var(--panel)}
[data-mode=light] header nav a.on{background:color-mix(in srgb,var(--brand) 10%,#fff);color:var(--brand)}
[data-mode=light] header nav a.cta{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:0 4px 12px -3px color-mix(in srgb,var(--brand) 40%,transparent)}
[data-mode=light] .card{border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
[data-mode=light] h1,[data-mode=light] h2{letter-spacing:-.02em;color:#141836}
[data-mode=light] :where(button,.btn){background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:0 4px 12px -4px color-mix(in srgb,var(--brand) 47%,transparent),inset 0 1px 0 #ffffff33;transition:transform .15s,box-shadow .15s,filter .15s}
[data-mode=light] :where(button:hover:not(:disabled),.btn:hover){transform:translateY(-1px);box-shadow:0 8px 18px -6px color-mix(in srgb,var(--brand) 53%,transparent),inset 0 1px 0 #ffffff33;filter:brightness(1.05)}
[data-mode=light] button:active:not(:disabled){transform:none}
[data-mode=light] button.sec,[data-mode=light] .btn.sec,[data-mode=light] .mode,[data-mode=light] .chip,[data-mode=light] .exopt,[data-mode=light] .mcard,[data-mode=light] .musicbtn,[data-mode=light] .themebtn,[data-mode=light] .planbadge.off,[data-mode=light] .ib,[data-mode=light] .burger{background:#fff;color:var(--ink);border:1px solid var(--line);box-shadow:0 1px 2px #1b1f3b0d}
[data-mode=light] button.sec:hover:not(:disabled),[data-mode=light] .mode:hover,[data-mode=light] .exopt:hover,[data-mode=light] .mcard:hover{background:color-mix(in srgb,var(--brand) 5%,#fff);border-color:color-mix(in srgb,var(--brand) 40%,#fff);box-shadow:0 6px 16px -8px color-mix(in srgb,var(--brand) 33%,transparent)}
[data-mode=light] .mcard{border-width:2px}[data-mode=light] .mcard.sel,[data-mode=light] .exopt.on{background:color-mix(in srgb,var(--brand) 10%,#fff);border-color:var(--brand)}
[data-mode=light] .mcard.q{border-color:#9db8f5}[data-mode=light] .mcard.a{border-color:#8fd9b3}
[data-mode=light] .mode b{color:#141836}
[data-mode=light] .ib.on,[data-mode=light] .inkbtn.on{background:var(--brand);color:#fff}
[data-mode=light] button:disabled{opacity:.45}
[data-mode=light] input,[data-mode=light] textarea,[data-mode=light] select{background:#fff;border:1.5px solid var(--line2);box-shadow:inset 0 1px 2px #1b1f3b0a;transition:border-color .15s,box-shadow .15s}
[data-mode=light] input:focus,[data-mode=light] textarea:focus,[data-mode=light] select:focus{outline:0;border-color:var(--brand2);box-shadow:0 0 0 4px color-mix(in srgb,var(--brand) 13%,transparent)}
[data-mode=light] .drop{background:color-mix(in srgb,var(--brand) 3%,#fff);border-color:color-mix(in srgb,var(--brand) 40%,#fff)}[data-mode=light] .drop:hover,[data-mode=light] .drop.over{background:color-mix(in srgb,var(--brand) 8%,#fff);border-color:var(--brand)}
[data-mode=light] .ans,[data-mode=light] .sg-opt,[data-mode=light] .tfbtn{box-shadow:0 6px 14px -6px #1b1f3b55,inset 0 -3px 0 #00000022}
[data-mode=light] .ans:nth-child(n+5),[data-mode=light] .sg-opt:nth-child(n+5){background:var(--brand2)}
[data-mode=light] .bar,[data-mode=light] .sg-prog,[data-mode=light] .hpbar,[data-mode=light] .track{background:#e6e8f6}
[data-mode=light] .expl,[data-mode=light] .sg-expl,[data-mode=light] .preview,[data-mode=light] .help,[data-mode=light] .tfcard{border-color:var(--brand2);box-shadow:none}
[data-mode=light] .tfans{background:#f3f4fc}
[data-mode=light] .lb td,[data-mode=light] .feat li,[data-mode=light] .hardq{border-color:var(--line)}
[data-mode=light] .examhead,[data-mode=light] .inkbar{background:#ffffffee;border-color:var(--line);box-shadow:var(--shadow)}
[data-mode=light] .planbadge,[data-mode=light] .mtime{background:#fff7dd;color:#8a5200;border-color:var(--acc)}
[data-mode=light] .planbadge{border:0;background:linear-gradient(135deg,#ffd45a,#f5b301)}
[data-mode=light] .planbadge.bad{color:#fff;background:var(--bad)}
[data-mode=light] .mtime.low,[data-mode=light] .tm-show.low{color:#fff;background:var(--bad);border-color:var(--bad)}
[data-mode=light] .tm-show{background:#fff7dd;color:#8a5200}
[data-mode=light] .bx-box{background:linear-gradient(145deg,var(--brand2),var(--brand));border-color:color-mix(in srgb,var(--brand) 60%,#fff);color:#fff;box-shadow:0 8px 18px -8px color-mix(in srgb,var(--brand) 60%,transparent)}
[data-mode=light] .bx-box.done{background:#eceefa;border-color:var(--line);color:#a0a6cc;box-shadow:none}
[data-mode=light] .dl-team,[data-mode=light] .bx-team,[data-mode=light] .bx-frow{box-shadow:var(--shadow)}
[data-mode=light] .sg-fill.show{color:#0f6b36}
[data-mode=light] .mcard.bad{color:#9f1239}
[data-mode=light] .flash .b{color:var(--ink);background:linear-gradient(145deg,#e4f8ec,#cdf1dc)}
[data-mode=light] .flash .f{box-shadow:var(--shadow);border:1px solid var(--line)}
[data-mode=light] .tm-show.end{color:#9f1239}
[data-mode=light] .rung.safe{color:#a15c07}[data-mode=light] .rung.now,[data-mode=light] .rung.now.safe{color:#fff}
[data-mode=light] footer,[data-mode=light] footer a{color:var(--mute)}
[data-mode=light] ::selection{background:color-mix(in srgb,var(--brand) 25%,#fff)}

[data-theme=ocean]{--g1:#c9ecff;--g2:#d4f5ee;--brand:#0a7bd1;--brand2:#14a3c7;--brand3:#13b5a6;--bg:#f2f9fd;--ink:#102a43;--mute:#5a7691;--line:#d8e8f3;--line2:#b6d3e6;--c0:#e5484d;--c1:#1f7ae0;--c2:#f0a30a;--c3:#17a673}
[data-theme=mint]{--g1:#d3f7de;--g2:#e3f4ff;--brand:#0f9d6b;--brand2:#2bb673;--brand3:#7cc417;--bg:#f3fbf6;--ink:#10301f;--mute:#5b7a68;--line:#dcefe3;--line2:#b9dcc8}
[data-theme=peach]{--g1:#ffe0d1;--g2:#fff0c9;--brand:#e8590c;--brand2:#f08c00;--brand3:#e64980;--bg:#fff9f4;--ink:#3a1d12;--mute:#85685a;--line:#f3e3d8;--line2:#e6c9b6}
[data-theme=lilac]{--g1:#f3d9ff;--g2:#ffe1ee;--brand:#a03bd6;--brand2:#d04fb5;--brand3:#e8438a;--bg:#fcf7ff;--ink:#2e1744;--mute:#7c6694;--line:#eee0f7;--line2:#dcc3ee}
[data-theme=night]{--bg:#0e1b24;--card:#162a36;--panel:#21404f;--deep:#0a141b;--deepa:#0a141bee;--line:#2c5366;--line2:#3a6a80;--sel:#2f6277;--ink:#eaf6fb;--mute:#8fb3c4;--acc:#4dd6c1;--badbg:#6b1f2a}
.mq,.ans.mil{color:#f4f3ff}
.themebtn{padding:2px 8px;background:var(--panel);color:var(--ink);font-size:16px;margin-right:6px}
.thpanel{position:fixed;top:60px;right:12px;z-index:960;width:min(340px,calc(100vw - 24px));background:var(--card);color:var(--ink);border:1px solid var(--line);border-radius:18px;padding:16px;box-shadow:0 18px 50px -12px #0008}
.thpanel h3{margin:0 0 4px}.thpanel p{margin:0 0 12px;font-size:14px}
.thgrid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.thopt{display:flex;flex-direction:column;gap:6px;align-items:stretch;text-align:left;padding:8px;background:var(--panel)!important;color:var(--ink)!important;border:2px solid transparent!important;box-shadow:none!important;font-size:14px}
.thopt.on{border-color:var(--acc)!important}
.thopt i{display:block;height:34px;border-radius:8px;border:1px solid #0002}
.thcustom{display:flex;align-items:center;gap:10px;margin-top:14px;font-size:14px}.thcustom input[type=color]{width:44px;height:34px;padding:2px;border-radius:8px;cursor:pointer}
.thcustom button{margin-left:auto;padding:6px 12px;font-size:13px}

/* Phần giới thiệu/FAQ ở trang chủ (cũng là nội dung cho công cụ tìm kiếm) */
.about{max-width:900px;margin:0 auto;padding:8px 20px 28px;color:var(--mute,inherit)}.about h2{font-size:1.2rem}.about h3{font-size:1rem;margin:16px 0 6px}.about summary{cursor:pointer;font-weight:600;padding:4px 0}.about[hidden]{display:none}

/* ---- Trang chủ (landing) ---- */
main.landing{max-width:min(1400px,100%)}
.lp-hero{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:36px;align-items:center;padding:28px 0 36px}
.lp-pill{display:inline-block;padding:6px 14px;border-radius:99px;font-size:14px;font-weight:600;background:color-mix(in srgb,var(--brand,var(--acc)) 14%,transparent);color:var(--brand,var(--acc))}
.lp-h1{font-size:clamp(34px,5vw,56px);line-height:1.08;letter-spacing:-.03em;margin:.35em 0 .3em}
.lp-grad{background:linear-gradient(90deg,var(--brand,var(--acc)),var(--brand3,#e8438a));-webkit-background-clip:text;background-clip:text;color:transparent}
.lp-sub{font-size:clamp(16px,2vw,19px);color:var(--mute);max-width:560px;margin:0 0 20px}
.lp-drop{margin-bottom:10px}
.drop.lp-dropzone{display:flex;gap:16px;align-items:center;text-align:left;padding:22px 24px;border-width:2px;transition:transform .15s,border-color .15s,background .15s}
.drop.lp-dropzone:hover{transform:translateY(-2px)}
.lp-dropicon{font-size:38px;line-height:1}
.lp-opts{display:flex;gap:10px 18px;flex-wrap:wrap;align-items:center;margin-bottom:14px;font-size:14px}
.lp-ai{display:flex;gap:6px;align-items:center;color:var(--mute)}.lp-ai input{width:auto}
.lp-cta{align-items:center;gap:12px}
.lp-big{padding:13px 22px;font-size:16px;border-radius:12px}
.lp-link{color:var(--brand,var(--acc));font-size:14px;font-weight:600;text-decoration:none}.lp-link:hover{text-decoration:underline}
.lp-trust{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}
.lp-trust span{font-size:13px;padding:5px 12px;border-radius:99px;background:var(--panel);color:var(--mute)}
.lp-visual{position:relative;display:flex;align-items:center;justify-content:center;gap:10px;min-height:380px}
.lp-doc{width:36%;padding:14px 12px;border-radius:14px;background:var(--card);box-shadow:0 18px 40px -18px #0006;transform:rotate(-5deg)}
.lp-docbar{width:26px;height:26px;border-radius:7px;background:#2b579a;color:#fff;font-weight:800;text-align:center;line-height:26px;margin-bottom:12px}
.lp-doc i{display:block;height:7px;border-radius:4px;background:var(--line2);margin:9px 0}.lp-doc i.u{background:var(--ok)}
.lp-arrow{font-size:26px;color:var(--brand,var(--acc));font-weight:800}
.lp-phone{width:46%;padding:16px 12px 12px;border-radius:26px;background:var(--deep);border:4px solid var(--line2);box-shadow:0 26px 50px -20px #0008;animation:lpfloat 5s ease-in-out infinite}
.lp-q{font-weight:700;font-size:14px;margin-bottom:10px;color:var(--ink)}
.lp-ans{display:grid;grid-template-columns:1fr 1fr;gap:6px}
.lp-ans span{display:flex;gap:5px;align-items:center;padding:9px 6px;border-radius:9px;font-size:12px;font-weight:600;color:#fff}
.lp-ans span b{opacity:.8}
.lp-ans span:nth-child(1){background:var(--c0)}.lp-ans span:nth-child(2){background:var(--c1)}.lp-ans span:nth-child(3){background:var(--c2)}.lp-ans span:nth-child(4){background:var(--c3)}
.lp-ans span:not(.ok){opacity:.55}.lp-ans span.ok{outline:3px solid var(--ok);outline-offset:1px}
.lp-rank{margin-top:10px;font-size:12px;text-align:center;color:var(--mute)}
.lp-chip{position:absolute;padding:7px 13px;border-radius:99px;font-size:13px;font-weight:700;background:var(--card);color:var(--ink);box-shadow:0 10px 24px -10px #0006;animation:lpfloat 4s ease-in-out infinite}
.lp-chip.c1{top:8%;right:2%;animation-delay:-1s}.lp-chip.c2{bottom:10%;left:4%;animation-delay:-2.5s}
@keyframes lpfloat{50%{transform:translateY(-8px)}}
@media(prefers-reduced-motion:reduce){.lp-phone,.lp-chip{animation:none}}
.lp-sec{padding:34px 0}
.lp-sec h2{font-size:clamp(24px,3.4vw,34px);text-align:center;letter-spacing:-.02em;margin:0 0 8px}
.lp-secsub{text-align:center;margin:0 0 24px}
.lp-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:24px}
.lp-step,.lp-feat,.lp-game{background:var(--card);border-radius:16px;padding:20px;border:1px solid var(--line)}
.lp-step h3{margin:10px 0 4px}.lp-step p,.lp-feat p{margin:0}
.lp-num{display:inline-grid;place-items:center;width:36px;height:36px;border-radius:50%;font-weight:800;color:#fff;background:linear-gradient(135deg,var(--brand,#6c5ce7),var(--brand3,#e8438a))}
.lp-games{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px}
.lp-game{display:flex;flex-direction:column;gap:4px;padding:16px;transition:transform .15s,border-color .15s}
.lp-game:hover{transform:translateY(-3px);border-color:var(--brand,var(--acc))}
.lp-emo{font-size:30px;line-height:1.1}.lp-game .mute{font-size:14px}
.lp-feats{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.lp-feat{display:flex;gap:14px;align-items:flex-start}.lp-feat b{font-size:17px}
.lp-fi{flex:none;display:grid;place-items:center;width:46px;height:46px;border-radius:13px;font-size:22px;font-weight:800;background:color-mix(in srgb,var(--brand,var(--acc)) 14%,transparent);color:var(--brand,var(--acc))}
.lp-final{margin:26px 0;padding:44px 24px;border-radius:24px;text-align:center;color:#fff;background:linear-gradient(135deg,var(--brand,#5b4bdb),var(--brand3,#b04fe0))}
.lp-final h2{color:#fff;font-size:clamp(24px,3.4vw,34px);margin:0 0 8px}.lp-final p{margin:0 0 20px;opacity:.9}
.lp-final .lp-white{background:#fff;color:#222;box-shadow:0 10px 24px -10px #0007}
.lp-final button.sec{background:#ffffff26;color:#fff;border:1px solid #ffffff55}
.lp-resume{display:flex;gap:12px;align-items:center;justify-content:space-between;flex-wrap:wrap;padding:12px 16px;border-radius:14px;background:var(--card);border:1px solid var(--line);margin-bottom:6px}
.lp-toolh{margin-top:36px}
.about{max-width:760px}.about h2{text-align:center}
@media(max-width:860px){
  .lp-hero{grid-template-columns:1fr;gap:20px;padding-top:12px}.lp-visual{min-height:300px;order:2}
  .lp-steps,.lp-feats{grid-template-columns:1fr}
  .lp-cta .lp-big{flex:1 1 100%}
}
@media(max-width:560px){.lp-games{grid-template-columns:1fr 1fr;gap:10px}.lp-game{padding:12px}.lp-game .mute{font-size:13px}}
/* nút phụ trong khối kêu gọi: giữ nền mờ trắng cả khi hover (quy tắc hover của giao diện sáng nền trắng làm chữ trắng biến mất) */
html .lp-final button.sec,html .lp-final button.sec:hover:not(:disabled){background:#ffffff26;color:#fff;border-color:#ffffff66;box-shadow:none}
html .lp-final button.sec:hover:not(:disabled){background:#ffffff40;border-color:#fff}

/* ---- Trình soạn câu hỏi (public/editor.js) ---- */
.rf{flex:1;min-width:0;padding:9px 12px;border-radius:8px;border:2px solid var(--line);background:var(--bg);color:var(--ink);line-height:1.5;white-space:pre-wrap;word-break:break-word;outline:0;cursor:text;min-height:calc(1.5em + 22px)}
.rf:focus{border-color:var(--brand2,var(--acc));box-shadow:0 0 0 4px color-mix(in srgb,var(--brand,var(--acc)) 13%,transparent)}
.rf:empty::before{content:attr(data-ph);color:var(--mute);pointer-events:none}
.rf .qimg{max-height:220px;vertical-align:middle;margin:2px;cursor:pointer}
.rf .opt .qimg,.opt .rf .qimg{max-height:90px}
.rf .fx{display:inline-block;padding:0 3px;border-radius:5px;cursor:pointer;user-select:all}.rf .fx:hover{background:color-mix(in srgb,var(--brand,var(--acc)) 14%,transparent)}
.rf sub,.rf sup{line-height:0}
[data-mode=light] .rf{background:#fff;border:1.5px solid var(--line2);box-shadow:inset 0 1px 2px #1b1f3b0a}
.rtb{position:sticky;z-index:40;display:flex;flex-wrap:wrap;gap:6px;align-items:center;padding:8px 10px;margin:0 0 14px}
.rtb-b{padding:6px 11px;min-width:36px;border-radius:8px;font-size:15px;background:var(--panel);color:var(--ink);box-shadow:none}
.rtb-b.wide{padding:6px 12px}.rtb-b.on{background:var(--brand,var(--acc));color:#fff}
[data-mode=light] .rtb-b{background:#fff;color:var(--ink);border:1px solid var(--line2);box-shadow:none}
[data-mode=light] .rtb-b.on{background:var(--brand);color:#fff;border-color:var(--brand)}
[data-mode=light] .rtb-b:hover:not(.on){background:color-mix(in srgb,var(--brand) 8%,#fff);transform:none}
.rtb-sep{width:1px;height:24px;background:var(--line2);margin:0 4px}
.rtb-hint{font-size:13px;margin-left:auto}
.rtb-pop{flex-basis:100%;display:flex;flex-wrap:wrap;gap:4px;padding:8px;border-radius:10px;background:var(--deep);border:1px solid var(--line)}
.rtb-pop[hidden]{display:none}
.rtb-sym{padding:4px 0;width:36px;min-height:34px;font-size:17px}
.fx-overlay{position:fixed;inset:0;z-index:200;background:#0008;display:flex;align-items:center;justify-content:center;padding:16px}
.fx-dlg{width:min(640px,100%);max-height:92vh;overflow:auto;margin:0}
.fx-dlg textarea{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:15px}
.fx-pv{min-height:64px;margin:10px 0;padding:14px;border-radius:10px;background:var(--deep);display:flex;align-items:center;justify-content:center;font-size:1.35em;overflow-x:auto}
.fx-pv.empty{color:var(--mute);font-size:15px}.fx-pv.err{color:var(--bad);font-size:14px;justify-content:flex-start}
.fx-tpl{display:flex;flex-wrap:wrap;gap:6px;margin-top:6px}.fx-tpl button{padding:6px 11px;min-height:36px;font-size:16px}
@media(max-width:560px){.rtb{padding:6px}.rtb-hint{flex-basis:100%;margin:0}.rtb-b.wide{padding:6px 9px;font-size:14px}}

.contactbox .cname { font-weight: 700; font-size: 1.1rem; margin: 6px 0 10px; }
.contactbox .actions { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.contactbox .actions .btn { text-decoration: none; }

.sea{position:absolute;inset:44px 0 0;pointer-events:none;overflow:hidden}
.sea .rays{position:absolute;inset:0;background:repeating-linear-gradient(105deg,#ffffff14 0 36px,transparent 36px 110px);mask-image:linear-gradient(#000,transparent 75%)}
.sea .bub{position:absolute;bottom:-20px;border-radius:50%;border:2px solid #ffffff88;background:#ffffff22;animation:bubup linear infinite}
@keyframes bubup{to{transform:translateY(-440px)}}
.sea .floor{position:absolute;left:0;right:0;bottom:0;height:46px;background:linear-gradient(transparent,#d9b36c 70%,#b8924d)}
.sea .floor span{position:absolute;bottom:2px;line-height:1;transform-origin:bottom center;animation:sway 3s ease-in-out infinite alternate}
@keyframes sway{from{transform:rotate(-6deg)}to{transform:rotate(6deg)}}
@media (prefers-reduced-motion:reduce){.sea .bub,.sea .floor span,.fhead{animation:none}}

/* Người dùng chọn giảm chuyển động: tắt hoạt ảnh và chuyển cảnh trên mọi màn hình */
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}
/* Bingo, Đoán chữ, Rắn */
.bingo{display:grid;gap:8px;margin:14px 0}
.bcell{min-height:64px;font-size:16px;background:var(--deep);color:inherit;border-radius:10px}
.bcell.hit{background:var(--c3);color:#fff}.bcell.win{outline:3px solid #fbbf24}.bcell.bad{animation:shake .4s;background:var(--badbg)}
.hmword{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;margin:18px 0}
.hmch{min-width:32px;height:42px;border-bottom:3px solid var(--acc);text-align:center;font-size:26px;font-weight:700}.hmch.gap{border-bottom-color:transparent;min-width:14px}
.hmkeys{display:flex;flex-wrap:wrap;gap:6px;justify-content:center}.hmkey{min-width:38px;padding:8px}
.sncanvas{max-width:100%;border-radius:10px;touch-action:none}
.snlegend{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:8px;margin:12px 0}.snopt{background:var(--deep);padding:8px 10px;border-radius:8px}
/* Tháp phòng thủ */
.tdcanvas{display:block;width:100%;max-width:640px;margin:0 auto 12px;border-radius:12px}