:root{
  --bg:#f6f7fc; --panel:#ffffff; --ink:#151a36; --mute:#5f6685; --line:#e4e7f3; --soft:#eef0fa;
  --navy:#1d2a7a; --navy2:#2c3cb0; --gold:#f2b51d; --ok:#11a36a; --bad:#e5484d;
  --shadow:0 12px 32px -16px rgba(29,42,122,.28); --r:18px;
  color-scheme:light;
}
body{transition:background .25s,color .25s}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);font-family:"Plus Jakarta Sans","Hind Siliguri",system-ui,sans-serif;line-height:1.55;font-size:15px}
.bn,[lang=bn]{font-family:"Hind Siliguri","Plus Jakarta Sans",sans-serif}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
a{color:var(--navy2)}
/* layout */
.app{display:grid;grid-template-columns:300px 1fr;min-height:100vh}
aside{background:var(--panel);border-right:1px solid var(--line);position:sticky;top:0;height:100vh;display:flex;flex-direction:column}
.brand{display:flex;gap:10px;align-items:center;padding:18px 18px 12px}
.brand .mk{width:42px;height:42px;border-radius:12px;background:var(--navy);display:grid;place-items:center;color:var(--gold);font-weight:800;font-size:22px;box-shadow:inset 0 -4px 0 var(--gold)}
.brand b{display:block;font-size:15px;letter-spacing:.6px}
.brand small{color:var(--mute);font-size:12px}
.nav{padding:4px 12px;display:grid;gap:2px}
.nav button{display:flex;align-items:center;gap:10px;border:0;background:none;padding:9px 12px;border-radius:12px;text-align:left;font-weight:600;color:var(--mute)}
.nav button:hover{background:var(--soft)}
.nav button.on{background:var(--navy);color:#fff}
.nav .ic{width:22px;text-align:center}
.side-h{padding:14px 18px 6px;font-size:11px;font-weight:800;letter-spacing:1.2px;color:var(--mute);text-transform:uppercase;display:flex;justify-content:space-between;align-items:center}
.side-search{margin:0 12px 6px;display:flex;align-items:center;gap:6px;background:var(--soft);border-radius:10px;padding:7px 10px}
.side-search input{border:0;background:none;outline:0;width:100%;font-size:13px}
.lesson-list{overflow:auto;padding:0 8px 16px;flex:1}
.ll-group{font-size:11px;font-weight:800;color:var(--mute);padding:10px 10px 4px;text-transform:uppercase;letter-spacing:.8px}
.ll{display:flex;gap:8px;align-items:center;width:100%;border:0;background:none;padding:7px 10px;border-radius:10px;text-align:left;font-size:13px}
.ll:hover{background:var(--soft)}
.ll.on{background:color-mix(in srgb,var(--c) 14%,white);font-weight:700}
.ll .n{flex:none;width:30px;height:24px;border-radius:7px;display:grid;place-items:center;font-size:11px;font-weight:800;color:#fff;background:var(--c)}
.ll .t{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ll .dn{color:var(--ok);font-weight:800}
.scrim{display:none;position:fixed;inset:0;background:rgba(10,14,40,.4);z-index:55}
main{min-width:0}
.topbar{position:sticky;top:0;z-index:30;background:rgba(246,247,252,.86);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);display:flex;gap:10px;align-items:center;padding:10px 24px}
.menu-btn{display:none;border:1px solid var(--line);background:var(--panel);border-radius:10px;padding:7px 10px}
.gsearch{flex:1;max-width:560px;display:flex;align-items:center;gap:8px;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:9px 14px}
.gsearch input{border:0;outline:0;background:none;width:100%}
.langseg{display:inline-flex;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:3px;flex:none}
.langseg button{border:0;background:none;padding:6px 11px;border-radius:9px;font-weight:700;font-size:13px;color:var(--mute);white-space:nowrap}
.langseg button.on{background:var(--gold);color:var(--navy)}
.content{padding:24px 28px;max-width:none;margin:0}
.view{display:none}.view.on{display:block;animation:fade .25s ease}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
/* hero */
.hero{border-radius:26px;padding:38px 34px 54px;color:#fff;position:relative;overflow:hidden;background:radial-gradient(1200px 400px at 90% -10%,#5b4bff 0,transparent 60%),linear-gradient(135deg,#1d2a7a,#2c3cb0)}
.hero:after{content:"";position:absolute;left:0;right:0;bottom:0;height:20px;background:conic-gradient(from 45deg,var(--gold) 0 25%,#1d2a7a 0 50%,var(--gold) 0 75%,#1d2a7a 0) 0 0/20px 20px}
.hero .arch{position:absolute;right:30px;top:24px;width:220px;height:200px;border:3px solid var(--gold);border-bottom:0;border-radius:110px 110px 0 0;opacity:.35}
.hero h1{font-size:clamp(30px,5vw,54px);line-height:1.02;margin:0 0 12px;font-weight:800;letter-spacing:1px}
.hero h1 span{color:var(--gold)}
.hero p{max-width:620px;margin:0 0 22px;opacity:.92}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:12px;max-width:820px;position:relative}
.stat{background:rgba(255,255,255,.13);border:1px solid rgba(255,255,255,.22);border-radius:16px;padding:12px 14px}
.stat b{display:block;font-size:26px;line-height:1.1}
.stat small{opacity:.85}
.row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.btn{border:0;border-radius:12px;padding:10px 16px;font-weight:700;background:var(--navy);color:#fff;display:inline-flex;gap:8px;align-items:center}
.btn.gold{background:var(--gold);color:var(--navy)}
.btn.ghost{background:var(--panel);color:var(--ink);border:1px solid var(--line)}
.btn.ok{background:var(--ok)}
.btn.red{background:var(--bad)}
.btn.sm{padding:6px 11px;font-size:13px;border-radius:9px}
.sec-h{display:flex;align-items:end;justify-content:space-between;gap:10px;margin:30px 0 14px}
.sec-h h2{margin:0;font-size:22px}
.sec-h p{margin:2px 0 0;color:var(--mute)}
.chip{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:700;padding:3px 10px;border-radius:999px;background:color-mix(in srgb,var(--c,#5b4bff) 14%,white);color:color-mix(in srgb,var(--c,#5b4bff) 75%,black)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px}
.lcard{position:relative;border:0;text-align:left;border-radius:20px;padding:16px;background:var(--panel);box-shadow:var(--shadow);overflow:hidden;display:flex;flex-direction:column;gap:8px;min-height:150px;transition:transform .18s}
.lcard:hover{transform:translateY(-3px)}
.lcard:before{content:"";position:absolute;inset:0 0 auto 0;height:6px;background:var(--c)}
.lcard .num{font-size:12px;font-weight:800;color:var(--c)}
.lcard h3{margin:0;font-size:16px;line-height:1.3}
.lcard .bn{color:var(--mute);font-size:13px}
.lcard .foot{margin-top:auto;display:flex;justify-content:space-between;align-items:center;font-size:12px;color:var(--mute)}
.bar{height:6px;background:var(--soft);border-radius:9px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--c,var(--ok));border-radius:9px}
.groups{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:6px}
.groups button{border:1px solid var(--line);background:var(--panel);padding:7px 12px;border-radius:999px;font-weight:700;font-size:13px;color:var(--mute)}
.groups button.on{background:var(--c);border-color:var(--c);color:#fff}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:20px;box-shadow:var(--shadow)}
/* lesson reader */
.lhead{border-radius:24px;padding:26px;color:#fff;background:linear-gradient(135deg,var(--c),color-mix(in srgb,var(--c) 55%,#151a36));position:relative;overflow:hidden}
.lhead h1{margin:6px 0 4px;font-size:clamp(22px,3.4vw,34px);line-height:1.15}
.lhead .bn{opacity:.92}
.lhead .tags{display:flex;gap:6px;flex-wrap:wrap;margin-top:12px}
.lhead .tags span{background:rgba(255,255,255,.18);padding:3px 10px;border-radius:999px;font-size:12px;font-weight:700}
.lhead .acts{margin-top:16px}
.ltools{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin:16px 0}
.reader h2{font-size:20px;margin:28px 0 10px;padding-left:12px;border-left:5px solid var(--c)}
.reader h3{font-size:15px;margin:22px 0 10px;color:color-mix(in srgb,var(--c) 70%,black);text-transform:none;display:flex;align-items:center;gap:8px}
.reader h3:before{content:"";width:10px;height:10px;border-radius:3px;background:var(--c)}
.struct{background:color-mix(in srgb,var(--gold) 16%,white);border:1px dashed color-mix(in srgb,var(--gold) 70%,black);border-radius:14px;padding:12px 14px;margin:10px 0;font-weight:700;font-family:ui-monospace,Menlo,Consolas,monospace,"Hind Siliguri";font-size:14px}
.struct:before{content:"STRUCTURE ";font-size:10px;letter-spacing:1px;color:#8a6200;display:block;font-family:"Plus Jakarta Sans"}
.para{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:14px 16px;margin:10px 0;font-size:15.5px}
.note{background:color-mix(in srgb,#5b4bff 7%,white);border-left:4px solid #5b4bff;border-radius:10px;padding:10px 14px;margin:10px 0;font-size:14px}
.note:before{content:"💡 ";}
.qlist{margin:6px 0 10px;padding-left:22px}
.qlist li{margin:3px 0}
.blist{margin:6px 0 10px;padding-left:22px}
.items{display:grid;gap:8px;margin:8px 0}
.it{display:grid;grid-template-columns:34px 1fr 1fr auto;gap:12px;align-items:start;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:11px 12px;border-left:4px solid var(--c)}
.it .ix{font-size:11px;font-weight:800;color:var(--mute);padding-top:3px}
.it .en{font-weight:600}
.it .bnt{color:#3b4163}
.it .ex{grid-column:2/4;font-size:13px;color:var(--mute);font-style:italic}
.it .acts{display:flex;gap:4px}
.ib{border:1px solid var(--line);background:var(--bg);border-radius:9px;width:32px;height:30px;display:grid;place-items:center;font-size:14px}
.ib.on{background:var(--ok);border-color:var(--ok);color:#fff}
.ib.fav{background:var(--gold);border-color:var(--gold)}
.it.qa .en{color:var(--navy2)}
.tbl{overflow:auto;margin:10px 0;border-radius:14px;border:1px solid var(--line);background:var(--panel)}
.tbl table{border-collapse:collapse;width:100%;font-size:14px}
.tbl th{background:color-mix(in srgb,var(--c) 15%,white);text-align:left;padding:9px 10px;font-size:13px;white-space:nowrap}
.tbl td{padding:8px 10px;border-top:1px solid var(--line);vertical-align:top}
.tbl td span.cell{display:inline-block;background:var(--soft);border-radius:7px;padding:1px 7px;margin:2px 3px 2px 0}
.dlg{display:grid;gap:8px;margin:10px 0}
.bub{max-width:80%;padding:9px 13px;border-radius:16px;background:var(--panel);border:1px solid var(--line)}
.bub.a{justify-self:start;border-bottom-left-radius:4px}
.bub.b{justify-self:end;background:color-mix(in srgb,var(--c) 12%,white);border-color:transparent;border-bottom-right-radius:4px}
.bub b{font-size:12px;color:var(--mute);display:block}
/* language modes */
.hide-bn .bnt,.hide-bn .bnh{filter:blur(6px);cursor:pointer;user-select:none}
.hide-en .en,.hide-en .ex{filter:blur(6px);cursor:pointer;user-select:none}
.hide-en .ex.rev{filter:none}
.vforms{display:flex;flex-wrap:wrap;gap:6px;margin-top:6px}.vforms span{font-size:12px;font-weight:600;background:var(--soft);border-radius:8px;padding:2px 8px;color:var(--mute)}.vforms b{color:var(--ink)}
.hide-bn .bnh.rev,.hide-bn .bnt.rev,.hide-en .en.rev{filter:none}
.bnh{color:#7a5a00}
/* practice */
.ptools{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-bottom:14px}
select,.inp{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:9px 12px;max-width:100%}
.flash{min-height:280px;border-radius:26px;display:grid;place-items:center;text-align:center;padding:34px;color:#fff;cursor:pointer;position:relative;box-shadow:var(--shadow);transition:transform .35s}
.flash .q{font-size:clamp(20px,3vw,30px);font-weight:700;line-height:1.3}
.flash small{display:block;margin-top:14px;opacity:.85;font-size:13px}
.flash .side{position:absolute;top:14px;left:18px;font-size:12px;font-weight:800;letter-spacing:1px;opacity:.85}
.pbar{height:8px;background:var(--line);border-radius:9px;overflow:hidden;margin:12px 0}
.pbar i{display:block;height:100%;background:linear-gradient(90deg,var(--gold),#ff7a45)}
.typebox{display:flex;gap:8px;margin-top:12px}
.typebox input{flex:1}
.diff .ok{background:#d6f5e6;color:#0a6b45;border-radius:4px;padding:0 2px}
.diff .no{background:#ffe0e0;color:#b4232a;border-radius:4px;padding:0 2px;text-decoration:line-through}
.diff .miss{background:#fff3cc;color:#7a5a00;border-radius:4px;padding:0 2px}
.opts{display:grid;gap:10px;margin-top:16px}
.opts button{text-align:left;padding:14px 16px;border-radius:14px;border:1px solid var(--line);background:var(--panel);font-weight:600}
.opts button:hover{border-color:var(--navy2)}
.opts button.right{background:var(--ok);color:#fff;border-color:var(--ok)}
.opts button.wrong{background:var(--bad);color:#fff;border-color:var(--bad)}
.tips{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:14px}
.tip{background:var(--panel);border-radius:18px;padding:18px;border:1px solid var(--line);border-top:6px solid var(--c);box-shadow:var(--shadow)}
.tip h4{margin:4px 0 8px;font-size:16px}
.tip p{margin:0;color:#3b4163;font-size:14px}
.res{display:grid;gap:8px}
.res .r{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:10px 14px;cursor:pointer;border-left:4px solid var(--c)}
.res .r:hover{background:var(--soft)}
mark{background:#ffe48a;border-radius:3px;padding:0 1px}
.story{background:var(--panel);border-radius:20px;padding:22px;border:1px solid var(--line);margin-bottom:14px;box-shadow:var(--shadow);border-top:6px solid var(--c)}
.story h3{margin:0 0 8px}
.story p{font-size:16.5px;line-height:1.75}
.story input.blank{border:0;border-bottom:2px solid var(--gold);background:color-mix(in srgb,var(--gold) 10%,white);border-radius:4px;padding:0 4px;width:7em;font-size:15px}
.modal{position:fixed;inset:0;background:rgba(10,14,40,.55);display:none;place-items:center;z-index:80;padding:16px}
.modal.on{display:grid}
.modal .card{width:min(820px,100%);max-height:92vh;overflow:auto}
label.l{display:block;font-size:12px;font-weight:800;color:var(--mute);margin:12px 0 5px;text-transform:uppercase;letter-spacing:.6px}
.field{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:#fbfbfe}
textarea.field{min-height:280px;font-family:ui-monospace,Menlo,Consolas,monospace,"Hind Siliguri";font-size:13px;line-height:1.5}
.adm{width:100%;border-collapse:collapse;font-size:14px}
.adm td,.adm th{padding:8px;border-bottom:1px solid var(--line);text-align:left;vertical-align:middle}
.toast{position:fixed;bottom:22px;left:50%;transform:translateX(-50%) translateY(20px);background:var(--navy);color:#fff;padding:11px 18px;border-radius:12px;opacity:0;transition:.25s;z-index:99;pointer-events:none}
.toast.on{opacity:1;transform:translateX(-50%)}
.empty{text-align:center;color:var(--mute);padding:40px}
.kbd{font-size:11px;border:1px solid var(--line);border-radius:5px;padding:1px 5px;background:var(--panel)}
.goal{display:flex;gap:14px;align-items:center}
.ring{--p:0;width:74px;height:74px;border-radius:50%;background:conic-gradient(var(--gold) calc(var(--p)*1%),rgba(255,255,255,.2) 0);display:grid;place-items:center;flex:none}
.ring b{width:56px;height:56px;border-radius:50%;background:#24318f;display:grid;place-items:center;font-size:14px}
.cheat{font-size:12.5px;background:var(--soft);border-radius:10px;padding:10px 12px;line-height:1.7}
.cheat code{background:#fff;border:1px solid var(--line);border-radius:5px;padding:0 4px}

.ll .pg{font-size:10.5px;color:var(--mute);font-weight:700;flex:none}
.lwrap{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:24px;align-items:start}
.toc{position:sticky;top:76px;max-height:calc(100vh - 92px);overflow:auto;background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:14px;box-shadow:var(--shadow)}
.toc h4{margin:4px 4px 10px;font-size:12px;letter-spacing:1px;text-transform:uppercase;color:var(--mute)}
.toc .ts{display:flex;gap:6px;align-items:center;background:var(--soft);border-radius:10px;padding:8px 10px;margin-bottom:8px}
.toc .ts input{border:0;background:none;outline:0;width:100%;font-size:13px}
.toc a{display:block;padding:6px 8px;border-radius:8px;text-decoration:none;color:var(--ink);font-size:13px;line-height:1.35}
.toc a:hover{background:var(--soft)}
.toc a.sub{padding-left:20px;color:var(--mute);font-size:12.5px}
.toc .meta{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:10px 0}
.toc .meta div{background:var(--soft);border-radius:12px;padding:8px 10px;font-size:12px;color:var(--mute)}
.toc .meta b{display:block;font-size:17px;color:var(--ink)}
.hidden-f{display:none!important}
.readbar{position:fixed;top:0;left:0;height:3px;background:linear-gradient(90deg,var(--gold),#ff7a45,#5b4bff);z-index:90;width:0;transition:width .1s}
.pgchip{display:inline-block;font-size:11px;font-weight:800;padding:2px 8px;border-radius:999px;background:var(--soft);color:var(--mute)}
.lhead .pgbig{position:absolute;right:24px;top:22px;text-align:right;opacity:.95}
.lhead .pgbig b{display:block;font-size:30px;line-height:1}
.lhead .pgbig small{font-size:11px;letter-spacing:1px;text-transform:uppercase}
.fsz{display:inline-flex;border:1px solid var(--line);border-radius:12px;background:var(--panel);overflow:hidden;flex:none}
.fsz button{border:0;background:none;padding:7px 10px;font-weight:800;color:var(--mute)}
.cmd{position:fixed;inset:0;background:rgba(10,14,40,.5);display:none;z-index:95;padding:10vh 16px}
.cmd.on{display:block}
.cmd .box{max-width:640px;margin:0 auto;background:#fff;border-radius:20px;box-shadow:0 30px 80px -20px rgba(0,0,0,.4);overflow:hidden}
.cmd input{width:100%;border:0;outline:0;padding:18px 20px;font-size:17px;border-bottom:1px solid var(--line)}
.cmd .rs{max-height:55vh;overflow:auto;padding:8px}
.cmd .rs button{display:flex;gap:10px;align-items:center;width:100%;border:0;background:none;text-align:left;padding:10px 12px;border-radius:12px}
.cmd .rs button.sel,.cmd .rs button:hover{background:var(--soft)}
aside{background:linear-gradient(180deg,#fff 0,#fbfbff 100%)}
.brand .mk{background:linear-gradient(135deg,#1d2a7a,#5b4bff)}
.lcard{border:1px solid transparent;background:linear-gradient(#fff,#fff) padding-box,linear-gradient(135deg,color-mix(in srgb,var(--c) 40%,white),#e9ecf8) border-box}
.it{transition:box-shadow .15s,transform .15s}
.it:hover{box-shadow:0 10px 24px -14px rgba(29,42,122,.35);transform:translateY(-1px)}
.install{display:none}
.gate{position:fixed;inset:0;z-index:200;display:grid;place-items:center;padding:16px;background:radial-gradient(900px 500px at 85% -10%,#5b4bff 0,transparent 60%),linear-gradient(135deg,#1d2a7a,#2c3cb0)}
.gate .gc{width:min(420px,100%);background:var(--panel);color:var(--ink);border-radius:24px;padding:28px;box-shadow:0 30px 80px -20px rgba(0,0,0,.5)}
.gate h1{margin:14px 0 4px;font-size:24px}.gate p{margin:0 0 6px;color:var(--mute)}
.gate .tag{color:var(--gold);font-weight:800;letter-spacing:2px;font-size:12px}
.gate .hint{font-size:12.5px;color:var(--mute);margin-top:14px;text-align:center}
.who{margin:6px 12px 0;padding:10px 12px;border-radius:12px;background:var(--soft);font-size:12.5px;display:flex;align-items:center;gap:8px}
.who b{flex:1}
body.locked .app{filter:blur(8px);pointer-events:none}
@media (max-width:1200px){.lwrap{grid-template-columns:1fr}.toc{position:relative;top:0;max-height:none;order:-1}}

:root[data-theme="dark"]{--bg:#0e1124;--panel:#171b33;--ink:#eceefc;--mute:#9aa1c6;--line:#272d50;--soft:#20264a;--shadow:0 14px 34px -18px rgba(0,0,0,.7);color-scheme:dark}
:root[data-theme="dark"] aside{background:linear-gradient(180deg,#151935,#121630)}
:root[data-theme="dark"] .topbar{background:rgba(14,17,36,.86)}
:root[data-theme="dark"] .lcard{background:linear-gradient(var(--panel),var(--panel)) padding-box,linear-gradient(135deg,color-mix(in srgb,var(--c) 45%,#171b33),#272d50) border-box}
:root[data-theme="dark"] .ll.on{background:color-mix(in srgb,var(--c) 28%,#171b33)}
:root[data-theme="dark"] .chip{background:color-mix(in srgb,var(--c,#5b4bff) 25%,#171b33);color:color-mix(in srgb,var(--c,#5b4bff) 55%,white)}
:root[data-theme="dark"] .struct{background:color-mix(in srgb,var(--gold) 14%,#171b33);border-color:color-mix(in srgb,var(--gold) 55%,#171b33)}
:root[data-theme="dark"] .struct:before{color:var(--gold)}
:root[data-theme="dark"] .note{background:color-mix(in srgb,#5b4bff 16%,#171b33)}
:root[data-theme="dark"] .it .bnt,:root[data-theme="dark"] .tip p{color:#c6cae6}
:root[data-theme="dark"] .bnh{color:#f2c94c}
:root[data-theme="dark"] .tbl th{background:color-mix(in srgb,var(--c) 26%,#171b33)}
:root[data-theme="dark"] .bub.b{background:color-mix(in srgb,var(--c) 24%,#171b33)}
:root[data-theme="dark"] .field{background:#11152b}
:root[data-theme="dark"] .cmd .box{background:var(--panel)}
:root[data-theme="dark"] .cmd input{background:var(--panel)}
:root[data-theme="dark"] .story input.blank{background:color-mix(in srgb,var(--gold) 14%,#171b33)}
:root[data-theme="dark"] mark{background:#8a6a00;color:#fff}
:root[data-theme="dark"] .diff .ok{background:#0f4d33;color:#9ff0c8}:root[data-theme="dark"] .diff .no{background:#5a1a1e;color:#ffb3b6}:root[data-theme="dark"] .diff .miss{background:#4d3b00;color:#ffe08a}
.themebtn{border:1px solid var(--line);background:var(--panel);border-radius:12px;padding:7px 12px;font-size:13px;font-weight:700;flex:none;white-space:nowrap}
@media (max-width:980px){
  .app{grid-template-columns:1fr}
  aside{position:fixed;inset:0 auto 0 0;width:300px;z-index:60;transform:translateX(-105%);transition:transform .25s;box-shadow:var(--shadow)}
  aside.open{transform:none}
  .menu-btn{display:block}
  .scrim{position:fixed;inset:0;background:rgba(10,14,40,.4);z-index:55;display:none}
  .scrim.on{display:block}
}
@media (max-width:640px){
  .content{padding:16px}
  .topbar{padding:10px 16px;flex-wrap:wrap}
  .gsearch{order:3;max-width:none;flex-basis:100%}
  .it{grid-template-columns:1fr auto}
  .it .ix{display:none}
  .it .bnt{grid-column:1/2}
  .it .acts{grid-row:1/3;grid-column:2}
  .it .ex{grid-column:1/2}
  .hero{padding:28px 20px 46px}
  .hero .arch{display:none}
  .bub{max-width:92%}
}