/* Ôn thi ENT · giao diện sạch, xanh dương + cam, chế độ tối, song ngữ chỉnh được */
:root{
  --bg:#f5f7fb; --card:#fff; --card2:#eef2f9; --ink:#142038; --muted:#5a6684; --line:#dfe5f0;
  --brand:#1a6dff; --brand-d:#0f4fc4; --brand-soft:#e5eeff; --accent:#ff7a1a; --accent-soft:#fff0e3;
  --ok:#14885a; --ok-bg:#e1f5eb; --bad:#d3403a; --bad-bg:#fdebea; --warn:#9a5a00; --warn-bg:#fff3d9; --info-bg:#e8f1ff;
  --d1:#1b9a60; --d2:#1a6dff; --d3:#e98200; --d4:#d12f68;
  --lv2:#0c9a95; --lv3:#2f6bff; --lv4:#7650f5; --lv5:#ec7600; --lv6:#d0316a;
  --r:14px; --fs:16px; --gap:16px;
  --shadow:0 1px 2px rgba(20,32,56,.05),0 10px 28px -14px rgba(20,32,56,.22);
  --f:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  color-scheme:light;
}
:root[data-theme="dark"]{
  --bg:#0d1322; --card:#151d31; --card2:#1b2540; --ink:#e8edf8; --muted:#a3aec7; --line:#27324f;
  --brand:#6ea8ff; --brand-d:#9bc2ff; --brand-soft:#192a4d; --accent:#ffa24d; --accent-soft:#3a2a15;
  --ok:#5fd29a; --ok-bg:#12301f; --bad:#ff8c84; --bad-bg:#3a1c1b; --warn:#f6c26b; --warn-bg:#392d12; --info-bg:#18294a;
  --d1:#5fd29a; --d2:#6ea8ff; --d3:#ffb347; --d4:#ff7fae;
  --lv2:#4fd6d0; --lv3:#7ea5ff; --lv4:#a58cff; --lv5:#ffa24d; --lv6:#ff85ae;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 12px 28px -14px rgba(0,0,0,.65);
  color-scheme:dark;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#0d1322; --card:#151d31; --card2:#1b2540; --ink:#e8edf8; --muted:#a3aec7; --line:#27324f;
    --brand:#6ea8ff; --brand-d:#9bc2ff; --brand-soft:#192a4d; --accent:#ffa24d; --accent-soft:#3a2a15;
    --ok:#5fd29a; --ok-bg:#12301f; --bad:#ff8c84; --bad-bg:#3a1c1b; --warn:#f6c26b; --warn-bg:#392d12; --info-bg:#18294a;
    --d1:#5fd29a; --d2:#6ea8ff; --d3:#ffb347; --d4:#ff7fae;
    --lv2:#4fd6d0; --lv3:#7ea5ff; --lv4:#a58cff; --lv5:#ffa24d; --lv6:#ff85ae;
    --shadow:0 1px 2px rgba(0,0,0,.4),0 12px 28px -14px rgba(0,0,0,.65);
    color-scheme:dark;
  }
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;font-family:var(--f);font-size:var(--fs);line-height:1.62;background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0 0 .45em;line-height:1.25;letter-spacing:-.01em}
p{margin:.55em 0}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
:focus-visible{outline:3px solid var(--brand);outline-offset:2px;border-radius:8px}
[hidden]{display:none!important}
.wrap{max-width:1180px;margin:0 auto;padding-inline:max(16px,env(safe-area-inset-left));}
.muted{color:var(--muted)}
.small{font-size:.86em}
.num{font-variant-numeric:tabular-nums}
.skip{position:absolute;left:-999px;top:0;background:var(--brand);color:#fff;padding:8px 14px;z-index:200}
.skip:focus{left:8px;top:8px}
mark{background:var(--accent-soft);color:inherit;border-radius:4px;padding:0 2px}

/* ---------- song ngữ ---------- */
.bi>.en,.bi>.vi{display:inline}
body[data-lang="en"] .bi>.vi,body[data-lang="en"] .pair>.t{display:none}
body[data-lang="vi"] .bi>.en{display:none}
body[data-lang="both"] .bi:not(.lbl)>.vi{display:block;color:var(--muted);font-size:.94em}
body[data-lang="both"] .bi:not(.lbl)>.en{display:block}
body[data-lang="both"] .bi.lbl>.vi::before{content:" · ";opacity:.5}
.bi.lbl>.vi{opacity:.82}
body[data-lang="both"] .bi.lbl>.en,body[data-lang="both"] .bi.lbl>.vi{display:inline}
.pair{display:block}
.pair>.e{display:block;font-weight:500}
.pair>.t{display:block;color:var(--muted);font-size:.93em}
body[data-layout="side"][data-lang="both"] .bi:not(.lbl),body[data-layout="side"] .pair{display:grid;grid-template-columns:1fr 1fr;gap:6px 18px;align-items:start}
body[data-layout="side"][data-lang="en"] .pair,body[data-layout="side"][data-lang="vi"] .bi:not(.lbl){display:block}
body[data-layout="side"][data-lang="vi"] .pair{display:grid}
@media (max-width:760px){
  body[data-layout="side"][data-lang="both"] .bi:not(.lbl),body[data-layout="side"] .pair{grid-template-columns:1fr}
}
body[data-reveal="1"] .vi[data-k]:not(.show),body[data-reveal="1"] .t[data-k]:not(.show),body[data-reveal="1"] .meanv[data-k]:not(.show){filter:blur(6px);cursor:pointer;user-select:none;transition:filter .2s}
body[data-edit="1"] .vi[data-k],body[data-edit="1"] .t[data-k],body[data-edit="1"] .meanv[data-k]{outline:1.5px dashed var(--accent);outline-offset:2px;border-radius:4px;cursor:text;background:var(--accent-soft)}
.vi[data-k].edited::after,.t[data-k].edited::after,.meanv[data-k].edited::after{content:"✎";font-size:.7em;margin-left:4px;color:var(--accent)}

/* ---------- thanh trên cùng ---------- */
.topbar{position:sticky;top:0;z-index:60;background:color-mix(in srgb,var(--card) 92%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.topbar .wrap{display:flex;align-items:center;gap:14px;min-height:60px;flex-wrap:wrap;padding-block:6px}
.logo{display:flex;align-items:center;gap:9px;font-weight:800;font-size:21px;letter-spacing:-.03em;white-space:nowrap}
.logo i{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--brand),#5a8dff);color:#fff;font-style:normal;font-size:15px;box-shadow:0 6px 14px -6px var(--brand)}
.logo b{color:var(--accent)}
.nav{display:flex;gap:2px;flex-wrap:wrap}
.nav a{padding:8px 12px;border-radius:10px;font-weight:600;font-size:.93rem;color:var(--muted)}
.nav a:hover{background:var(--card2);color:var(--ink)}
.nav a.on{background:var(--brand-soft);color:var(--brand)}
.search{flex:1;min-width:170px;max-width:360px;position:relative;margin-left:auto}
.search input{width:100%;padding:9px 14px 9px 38px;border:1px solid var(--line);border-radius:999px;background:var(--bg);outline:0}
.search input:focus{border-color:var(--brand);background:var(--card)}
.search::before{content:"";position:absolute;left:13px;top:50%;width:14px;height:14px;transform:translateY(-55%);background:currentColor;opacity:.45;-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='3' stroke-linecap='round'%3E%3Ccircle cx='10' cy='10' r='7'/%3E%3Cpath d='m20 20-5-5'/%3E%3C/svg%3E") center/contain no-repeat;mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='3' stroke-linecap='round'%3E%3Ccircle cx='10' cy='10' r='7'/%3E%3Cpath d='m20 20-5-5'/%3E%3C/svg%3E") center/contain no-repeat}
.sugg{position:absolute;left:0;right:0;top:calc(100% + 6px);background:var(--card);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);overflow:hidden;z-index:70;max-height:60vh;overflow-y:auto}
.sugg a{display:block;padding:9px 14px;border-bottom:1px solid var(--line);font-size:.92rem}
.sugg a:last-child{border:0}
.sugg a:hover,.sugg a.on{background:var(--brand-soft)}
.sugg small{color:var(--muted);display:block}
.ib{display:inline-grid;place-items:center;min-width:38px;height:38px;border-radius:10px;border:1px solid var(--line);background:var(--card);font-weight:700}
.ib:hover{background:var(--card2)}
.burger{display:none}

/* thanh song ngữ */
.bar2{position:sticky;top:60px;z-index:50;background:var(--card);border-bottom:1px solid var(--line)}
.bar2 .wrap{display:flex;align-items:center;gap:10px 14px;flex-wrap:wrap;padding-block:7px;font-size:.88rem}
.bar2 .ttl{font-weight:700;color:var(--muted);display:flex;align-items:center;gap:6px}
.seg{display:inline-flex;background:var(--card2);border:1px solid var(--line);border-radius:10px;padding:2px;gap:2px}
.seg button{border:0;background:transparent;padding:5px 11px;border-radius:8px;font-weight:700;font-size:.85rem;color:var(--muted)}
.seg button[aria-pressed="true"]{background:var(--card);color:var(--brand);box-shadow:0 1px 3px rgba(0,0,0,.14)}
.tg{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:var(--card);border-radius:10px;padding:5px 10px;font-weight:600;font-size:.85rem;color:var(--muted)}
.tg[aria-pressed="true"]{border-color:var(--brand);color:var(--brand);background:var(--brand-soft)}
.fsz{display:inline-flex;align-items:center;gap:6px}
.fsz input{width:92px;accent-color:var(--brand)}
.bar2 .grow{flex:1}
@media (max-width:760px){
  .bar2{top:0;position:static}
  .nav{order:5;width:100%;overflow-x:auto;flex-wrap:nowrap;padding-bottom:2px}
  .nav a{white-space:nowrap;flex:0 0 auto}
  .search{max-width:none;order:4;width:100%;flex-basis:100%}
  .bar2 .wrap{gap:8px}
  .bar2.collapsed .opt-more{display:none}
}

/* dải thời gian thực */
.live{background:linear-gradient(90deg,#0f3ea8,#1a6dff 60%,#3d8bff);color:#fff;font-size:.86rem}
.live .wrap{display:flex;gap:6px 22px;align-items:center;flex-wrap:wrap;padding-block:7px}
.live b{font-variant-numeric:tabular-nums;font-weight:700}
.pulse{display:inline-block;width:8px;height:8px;border-radius:50%;background:#53f0a1;box-shadow:0 0 0 0 rgba(83,240,161,.7);animation:pl 1.8s infinite;margin-right:6px}
@keyframes pl{70%{box-shadow:0 0 0 9px rgba(83,240,161,0)}100%{box-shadow:0 0 0 0 rgba(83,240,161,0)}}
.live .sp{flex:1}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* ---------- bố cục chung ---------- */
#app{padding-block:22px 64px;min-height:62vh;outline:0}
.crumb{display:flex;gap:6px;align-items:center;flex-wrap:wrap;font-size:.88rem;color:var(--muted);margin-bottom:12px}
.crumb a:hover{color:var(--brand)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px;box-shadow:var(--shadow)}
.card.flat{box-shadow:none}
.grid{display:grid;gap:var(--gap)}
.g2{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}
.g-auto{grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}
@media (max-width:900px){.g3,.g4{grid-template-columns:repeat(2,1fr)}}
@media (max-width:600px){.g2,.g3,.g4{grid-template-columns:1fr}}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.sp{flex:1}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;border:1px solid var(--line);background:var(--card);padding:9px 16px;border-radius:11px;font-weight:700;font-size:.93rem;transition:transform .08s,background .15s,border-color .15s}
.btn:hover{background:var(--card2)}
.btn:active{transform:translateY(1px)}
.btn.pri{background:var(--brand);border-color:var(--brand);color:#fff}
.btn.pri:hover{background:var(--brand-d)}
.btn.acc{background:var(--accent);border-color:var(--accent);color:#fff}
.btn.sm{padding:5px 11px;font-size:.84rem;border-radius:9px}
.btn.ghost{background:transparent}
.btn[disabled]{opacity:.5;cursor:not-allowed}
.chip{display:inline-flex;align-items:center;gap:5px;padding:2px 10px;border-radius:999px;font-size:.78rem;font-weight:700;background:var(--card2);color:var(--muted);white-space:nowrap}
.chip.lv{background:color-mix(in srgb,var(--c) 14%,transparent);color:var(--c)}
.dtag{--c:var(--d1);background:color-mix(in srgb,var(--c) 15%,transparent);color:var(--c)}
.dtag.d2{--c:var(--d2)}.dtag.d3{--c:var(--d3)}.dtag.d4{--c:var(--d4)}
.bar{height:7px;border-radius:99px;background:var(--card2);overflow:hidden}
.bar i{display:block;height:100%;background:linear-gradient(90deg,var(--brand),#53a0ff);border-radius:99px;transition:width .5s cubic-bezier(.2,.8,.2,1)}
h1.pt{font-size:clamp(1.55rem,3.4vw,2.2rem);font-weight:800}
h2.st{font-size:1.25rem;font-weight:800;margin:26px 0 12px;display:flex;align-items:center;gap:10px}
h2.st .sp{height:1px;background:var(--line)}

/* ---------- trang chủ ---------- */
.hero{display:grid;grid-template-columns:1.25fr .9fr;gap:var(--gap)}
@media (max-width:900px){.hero{grid-template-columns:1fr}}
.hero-main{background:linear-gradient(135deg,#0f3ea8 0%,#1a6dff 55%,#4e9bff 100%);color:#fff;border:0;position:relative;overflow:hidden}
.hero-main::after{content:"";position:absolute;right:-70px;top:-70px;width:260px;height:260px;border-radius:50%;background:radial-gradient(circle,rgba(255,255,255,.22),transparent 65%)}
.hero-main h1{font-size:clamp(1.8rem,4vw,2.7rem);font-weight:800;margin-bottom:6px}
.hero-main p{opacity:.92;max-width:52ch}
.hero-main .btn{border-color:rgba(255,255,255,.4);background:rgba(255,255,255,.14);color:#fff}
.hero-main .btn.pri{background:#fff;color:#0f3ea8;border-color:#fff}
.clock{font-size:2.5rem;font-weight:800;letter-spacing:-.03em;font-variant-numeric:tabular-nums;line-height:1}
.today{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:14px}
.today div{background:var(--card2);border-radius:12px;padding:10px 12px}
.today b{display:block;font-size:1.35rem;font-variant-numeric:tabular-nums}
.today span{font-size:.78rem;color:var(--muted);font-weight:600}
.lvcard{position:relative;overflow:hidden;padding:0;display:flex;flex-direction:column;transition:transform .15s,box-shadow .15s}
.lvcard:hover{transform:translateY(-3px)}
.lvcard .top{background:linear-gradient(135deg,var(--c),color-mix(in srgb,var(--c) 55%,#fff));color:#fff;padding:16px 18px}
.lvcard .top h3{margin:0;font-size:1.35rem;font-weight:800}
.lvcard .top small{opacity:.9;font-weight:600}
.lvcard .bd{padding:14px 18px 16px;display:grid;gap:8px;flex:1}
.lvcard .meta{display:flex;gap:12px;flex-wrap:wrap;font-size:.84rem;color:var(--muted);font-weight:600}
.diffs{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
@media (max-width:760px){.diffs{grid-template-columns:repeat(2,1fr)}}
.dcard{border:1px solid var(--line);background:var(--card);border-radius:14px;padding:13px 14px;border-top:4px solid var(--c)}
.dcard h4{margin:0 0 3px;font-size:1rem;color:var(--c)}
.dcard p{margin:0;font-size:.84rem;color:var(--muted)}

/* ---------- level / unit ---------- */
.unitcard{padding:15px 16px;display:grid;gap:8px;transition:transform .15s,border-color .15s}
.unitcard:hover{transform:translateY(-2px);border-color:var(--c)}
.unitcard .no{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:10px;background:color-mix(in srgb,var(--c) 14%,transparent);color:var(--c);font-weight:800}
.unitcard h3{margin:0;font-size:1.02rem}
.unitcard .acts{display:flex;gap:6px;flex-wrap:wrap}
.unithead{display:flex;gap:16px;align-items:flex-start;flex-wrap:wrap;margin-bottom:6px}
.unithead .no{width:58px;height:58px;border-radius:16px;background:var(--c);color:#fff;display:grid;place-items:center;font-size:1.7rem;font-weight:800;box-shadow:0 10px 20px -10px var(--c)}
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin:14px 0 20px;overflow-x:auto}
.tabs a{padding:10px 16px;font-weight:700;color:var(--muted);border-bottom:3px solid transparent;white-space:nowrap}
.tabs a:hover{color:var(--ink)}
.tabs a.on{color:var(--c);border-color:var(--c)}
.pn{display:flex;justify-content:space-between;gap:10px;margin-top:28px;flex-wrap:wrap}

/* ---------- lý thuyết ---------- */
.toc{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px}
.toc a{padding:5px 12px;border-radius:99px;border:1px solid var(--line);background:var(--card);font-size:.85rem;font-weight:600}
.toc a:hover{border-color:var(--brand);color:var(--brand)}
.topic{scroll-margin-top:130px}
.topic>h3{font-size:1.2rem;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.topic>h3 .no{background:var(--c);color:#fff;border-radius:8px;padding:1px 9px;font-size:.85rem}
.blk{margin:12px 0}
.formula{background:var(--info-bg);border:1px solid color-mix(in srgb,var(--brand) 25%,transparent);border-left:5px solid var(--brand);border-radius:12px;padding:11px 15px;font-weight:700;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.95em;overflow-x:auto;white-space:pre-wrap}
.formula small{display:block;font-family:var(--f);font-weight:500;color:var(--muted);font-size:.86em;margin-top:3px}
.callout{border-radius:12px;padding:11px 15px;border:1px solid transparent;display:grid;grid-template-columns:auto 1fr;gap:0 10px}
.callout::before{font-size:1.15em;line-height:1.5}
.callout.tip{background:var(--ok-bg);border-color:color-mix(in srgb,var(--ok) 30%,transparent)}.callout.tip::before{content:"💡"}
.callout.warn{background:var(--bad-bg);border-color:color-mix(in srgb,var(--bad) 30%,transparent)}.callout.warn::before{content:"⚠️"}
.callout.key{background:var(--warn-bg);border-color:color-mix(in srgb,var(--warn) 30%,transparent)}.callout.key::before{content:"🔑"}
.exlist{display:grid;gap:8px;margin:0;padding:0;list-style:none}
.exlist li{padding:9px 14px;background:var(--card2);border-radius:11px;border-left:4px solid var(--c)}
.exlist .pair>.e{font-weight:600}
.exlist .spk{float:right;margin:0 0 0 8px}
.tbl{overflow-x:auto;border:1px solid var(--line);border-radius:12px}
.tbl table{border-collapse:collapse;width:100%;font-size:.94em}
.tbl th{background:var(--card2);text-align:left;font-weight:800}
.tbl th,.tbl td{padding:8px 12px;border-bottom:1px solid var(--line);vertical-align:top}
.tbl tr:last-child td{border-bottom:0}
.tbl td .bi:not(.lbl)>.vi{font-size:.9em}
.fixlist{display:grid;gap:8px}
.fix{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.fix div{padding:8px 13px;border-radius:11px;font-weight:500}
.fix .x{background:var(--bad-bg);color:var(--bad)}.fix .x::before{content:"✗ ";font-weight:800}
.fix .o{background:var(--ok-bg);color:var(--ok)}.fix .o::before{content:"✓ ";font-weight:800}
@media (max-width:620px){.fix{grid-template-columns:1fr}}
.blk ul.ul{margin:.3em 0;padding-left:1.25em}
.blk ul.ul li{margin:.25em 0}
.spk-btn{border:0;background:var(--brand-soft);color:var(--brand);width:30px;height:30px;border-radius:50%;display:inline-grid;place-items:center;font-size:.85rem;flex:none}
.spk-btn:hover{background:var(--brand);color:#fff}

/* ---------- từ vựng ---------- */
.vtools{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-bottom:12px}
.vtools input[type=search]{padding:8px 13px;border:1px solid var(--line);border-radius:10px;background:var(--card);min-width:200px;outline:0}
.vlist{display:grid;gap:8px}
.vrow{display:grid;grid-template-columns:34px minmax(150px,1.1fr) 52px minmax(130px,1fr) minmax(200px,1.7fr);gap:10px;align-items:start;padding:10px 12px;background:var(--card);border:1px solid var(--line);border-radius:12px}
.vrow.known{opacity:.55}
.vrow .w{font-weight:800;font-size:1.04em}
.vrow .pos{font-size:.76rem;font-weight:800;color:var(--brand);background:var(--brand-soft);border-radius:6px;padding:1px 6px;text-align:center;height:fit-content}
.vrow .ex{font-size:.9em;color:var(--muted)}
.vrow .ex .e{color:var(--ink)}
.vrow input[type=checkbox]{width:19px;height:19px;accent-color:var(--ok);margin-top:3px}
body.hidemean .vrow .mean{filter:blur(7px);cursor:pointer}
body.hidemean .vrow .mean.show{filter:none}
@media (max-width:820px){.vrow{grid-template-columns:30px 1fr 50px}.vrow .mean,.vrow .ex{grid-column:2/-1}}
.fc-wrap{max-width:560px;margin:0 auto}
.fc{perspective:1200px;height:270px;margin:14px 0}
.fc-in{position:relative;width:100%;height:100%;transition:transform .5s;transform-style:preserve-3d;cursor:pointer}
.fc.flip .fc-in{transform:rotateY(180deg)}
.fc-f,.fc-b{position:absolute;inset:0;backface-visibility:hidden;border-radius:20px;border:1px solid var(--line);background:var(--card);box-shadow:var(--shadow);display:grid;place-content:center;text-align:center;padding:22px;gap:6px}
.fc-b{transform:rotateY(180deg);background:var(--brand-soft)}
.fc-f .w{font-size:2.1rem;font-weight:800}

/* ---------- luyện tập ---------- */
.qhead{position:sticky;top:112px;z-index:30;background:color-mix(in srgb,var(--bg) 94%,transparent);backdrop-filter:blur(8px);padding:8px 0 10px}
@media (max-width:760px){.qhead{top:0}}
.qstat{display:flex;gap:16px;flex-wrap:wrap;align-items:center;font-weight:700;font-size:.92rem}
.qstat .t{font-variant-numeric:tabular-nums}
.qseg{display:flex;gap:3px;margin-top:8px}
.qseg i{flex:1;height:7px;border-radius:99px;background:var(--line);transition:background .2s}
.qseg i.ok{background:var(--ok)}.qseg i.no{background:var(--bad)}.qseg i.cur{background:var(--brand)}
.qcard{padding:22px}
.qcard .stem{font-size:1.14em;font-weight:600;line-height:1.55;margin-bottom:16px}
.qcard .stem u{text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:4px;text-decoration-color:var(--brand);white-space:nowrap}
.qcard .stem u sup{font-size:.62em;font-weight:800;color:var(--brand);margin-left:1px}
.blank{display:inline-block;min-width:72px;border-bottom:2.5px solid var(--brand);text-align:center;font-weight:800;color:var(--brand);padding:0 6px}
.opts{display:grid;gap:9px}
.opt{display:flex;gap:12px;align-items:flex-start;text-align:left;width:100%;padding:12px 15px;border:1.5px solid var(--line);background:var(--card);border-radius:13px;font-weight:600;transition:border-color .12s,background .12s,transform .08s}
.opt:hover:not([disabled]){border-color:var(--brand);background:var(--brand-soft)}
.opt kbd{flex:none;display:inline-grid;place-items:center;width:26px;height:26px;border-radius:8px;background:var(--card2);font-weight:800;font-size:.8rem;font-family:inherit}
.opt.ok{border-color:var(--ok);background:var(--ok-bg)}.opt.ok kbd{background:var(--ok);color:#fff}
.opt.no{border-color:var(--bad);background:var(--bad-bg)}.opt.no kbd{background:var(--bad);color:#fff}
.opt.dim{opacity:.6}
.opt[disabled]{cursor:default}
.typebox{display:flex;gap:10px;flex-wrap:wrap}
.typebox input{flex:1;min-width:180px;padding:12px 14px;border:1.5px solid var(--line);border-radius:12px;background:var(--card);font-size:1.05em;font-weight:600;outline:0}
.typebox input:focus{border-color:var(--brand)}
.typebox input.ok{border-color:var(--ok);background:var(--ok-bg)}.typebox input.no{border-color:var(--bad);background:var(--bad-bg)}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0;min-height:44px}
.chips.ans{padding:8px;border:1.5px dashed var(--line);border-radius:12px;background:var(--card2)}
.wchip{padding:7px 13px;border-radius:10px;border:1.5px solid var(--line);background:var(--card);font-weight:700}
.wchip:hover{border-color:var(--brand)}
.fb{margin-top:14px;padding:13px 16px;border-radius:13px;animation:up .25s ease}
@keyframes up{from{opacity:0;transform:translateY(6px)}}
.fb.ok{background:var(--ok-bg);border:1px solid color-mix(in srgb,var(--ok) 35%,transparent)}
.fb.no{background:var(--bad-bg);border:1px solid color-mix(in srgb,var(--bad) 35%,transparent)}
.fb h4{margin:0 0 4px;font-size:1rem}
.fb.ok h4{color:var(--ok)}.fb.no h4{color:var(--bad)}
.ring{--p:0;width:130px;height:130px;border-radius:50%;background:conic-gradient(var(--c,var(--ok)) calc(var(--p)*1%),var(--card2) 0);display:grid;place-items:center;position:relative}
.ring::after{content:"";position:absolute;inset:12px;border-radius:50%;background:var(--card)}
.ring b{position:relative;z-index:1;font-size:1.9rem;font-weight:800;font-variant-numeric:tabular-nums}
.sumgrid{display:grid;grid-template-columns:auto 1fr;gap:24px;align-items:center}
@media (max-width:620px){.sumgrid{grid-template-columns:1fr;justify-items:center;text-align:center}}
.rv{display:grid;gap:8px;margin-top:10px}
.rvi{padding:10px 14px;border-radius:12px;border:1px solid var(--line);background:var(--card);border-left-width:5px}
.rvi.ok{border-left-color:var(--ok)}.rvi.no{border-left-color:var(--bad)}
.rvi .q{font-weight:600}
.stars{letter-spacing:2px;color:#f4b400;font-size:1.05rem}
.stars .off{color:var(--line)}

/* ---------- nghe ---------- */
.ctl{display:flex;gap:10px 16px;flex-wrap:wrap;align-items:center}
.ctl label{font-size:.85rem;font-weight:700;color:var(--muted);display:flex;gap:7px;align-items:center}
.ctl select,.ctl input[type=range]{accent-color:var(--brand)}
.ctl select{padding:6px 10px;border-radius:9px;border:1px solid var(--line);background:var(--card);max-width:240px}
.player{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:12px 14px;border-radius:14px;background:var(--card2)}
.playbtn{width:52px;height:52px;border-radius:50%;border:0;background:var(--brand);color:#fff;font-size:1.3rem;display:grid;place-items:center;box-shadow:0 8px 18px -8px var(--brand)}
.playbtn:hover{background:var(--brand-d)}
.trans{display:grid;gap:4px;margin-top:14px}
.sent{padding:8px 13px;border-radius:11px;border-left:4px solid transparent;cursor:pointer;transition:background .15s}
.sent:hover{background:var(--card2)}
.sent.now{background:var(--brand-soft);border-left-color:var(--brand)}
.sent.done{opacity:.6}
.sent .w{border-radius:4px;transition:background .1s}
.sent .w.on{background:var(--accent);color:#fff}
.sent .who{font-size:.74rem;font-weight:800;letter-spacing:.04em;text-transform:uppercase;color:var(--c,var(--brand));margin-right:6px}
.cloze-in{display:inline-block;width:var(--w,90px);padding:1px 6px;border:0;border-bottom:2px solid var(--brand);background:var(--brand-soft);font-weight:700;text-align:center;border-radius:5px 5px 0 0;outline:0;color:var(--ink)}
.cloze-in.ok{border-color:var(--ok);background:var(--ok-bg)}.cloze-in.no{border-color:var(--bad);background:var(--bad-bg)}
.bank{display:flex;gap:7px;flex-wrap:wrap;margin:10px 0}
.bank span{padding:3px 11px;border-radius:99px;background:var(--card2);font-weight:700;font-size:.9em}
.modes{display:flex;gap:6px;flex-wrap:wrap}
.modes button{padding:8px 14px;border-radius:11px;border:1.5px solid var(--line);background:var(--card);font-weight:700}
.modes button[aria-pressed="true"]{border-color:var(--c,var(--brand));background:color-mix(in srgb,var(--c,var(--brand)) 12%,transparent);color:var(--c,var(--brand))}
.dict{display:grid;gap:10px}
.dict textarea{width:100%;min-height:74px;padding:11px 14px;border:1.5px solid var(--line);border-radius:12px;background:var(--card);resize:vertical;outline:0;font-weight:500}
.dict textarea:focus{border-color:var(--brand)}
.diffout{line-height:1.9}
.diffout .ok{color:var(--ok);font-weight:700}.diffout .miss{color:var(--bad);font-weight:800;text-decoration:underline wavy}.diffout .extra{color:var(--bad);text-decoration:line-through;opacity:.8}

/* ---------- khác ---------- */
.empty{text-align:center;padding:42px 16px;color:var(--muted)}
.empty .big{font-size:2.5rem}
.toast{position:fixed;left:50%;bottom:22px;transform:translate(-50%,40px);background:#142038;color:#fff;padding:10px 18px;border-radius:12px;box-shadow:var(--shadow);opacity:0;transition:.25s;z-index:300;pointer-events:none;max-width:90vw}
.toast.on{opacity:1;transform:translate(-50%,0)}
table.stat{border-collapse:collapse;width:100%}
table.stat th,table.stat td{padding:8px 10px;border-bottom:1px solid var(--line);text-align:center;font-size:.92rem}
table.stat td:first-child,table.stat th:first-child{text-align:left}
.heat{display:flex;gap:4px;flex-wrap:wrap}
.heat i{width:22px;height:22px;border-radius:6px;background:var(--card2);display:inline-block}
.heat i[data-l="1"]{background:color-mix(in srgb,var(--brand) 25%,var(--card2))}.heat i[data-l="2"]{background:color-mix(in srgb,var(--brand) 50%,var(--card2))}.heat i[data-l="3"]{background:color-mix(in srgb,var(--brand) 75%,var(--card2))}.heat i[data-l="4"]{background:var(--brand)}
footer{border-top:1px solid var(--line);background:var(--card);padding:22px 0;color:var(--muted);font-size:.88rem}
footer .wrap{display:flex;gap:10px 28px;flex-wrap:wrap;justify-content:space-between}
@media print{.topbar,.bar2,.live,footer,.btn,.tabs,.pn{display:none!important}body{background:#fff}}

.hero-main .bi:not(.lbl)>.vi{color:#e2ecff!important}