:root{
  --bg:#F3F5FB; --paper:#FFFFFF; --paper-2:#ECEFF7; --ink:#111833; --ink-2:#465069; --ink-3:#7A829B;
  --line:#DCE1EE; --navy:#1D2B5C; --sun:#FFB31F; --sun-soft:rgba(255,179,31,.18); --mint:#0FA88A; --coral:#EE5A45;
  --link:#2A47D4; --btn:#1D2B5C; --btn-ink:#FFFFFF; --focus:#2A47D4;
  --good:#118A5E; --good-soft:rgba(17,138,94,.12); --bad:#C83A3F; --bad-soft:rgba(200,58,63,.10); --warn:#B87500;
  --pro:#0F8F77; --pro-soft:rgba(15,143,119,.12); --plus:#B86E00; --plus-soft:rgba(255,179,31,.22);
  --b0:#2A47D4; --b1:#0F8F77; --b2:#C2590C; --b3:#A1358F; --b4:#5B6D0B; --b5:#1C73B7;
  --grid:rgba(29,43,92,.055);
  --shadow:0 1px 2px rgba(17,24,51,.05),0 8px 24px rgba(17,24,51,.07);
  --f-display:"Bricolage Grotesque","Be Vietnam Pro",system-ui,sans-serif;
  --f-body:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    color-scheme:dark;
    --bg:#0B1021; --paper:#131A31; --paper-2:#1A2241; --ink:#EEF1FA; --ink-2:#AEB5CD; --ink-3:#7F87A4;
    --line:#283157; --link:#9EB0FF; --btn:#FFB31F; --btn-ink:#1A1300; --focus:#9EB0FF;
    --good:#45C994; --good-soft:rgba(69,201,148,.14); --bad:#FF7C80; --bad-soft:rgba(255,124,128,.12); --warn:#FFC24D;
    --pro:#3FD2B4; --pro-soft:rgba(63,210,180,.14); --plus:#FFC24D; --plus-soft:rgba(255,179,31,.16);
    --b0:#93A6FF; --b1:#3FD2B4; --b2:#F49A55; --b3:#E37CD3; --b4:#B9CC4E; --b5:#62B5F3;
    --grid:rgba(160,180,255,.05);
    --shadow:0 1px 2px rgba(0,0,0,.35),0 8px 24px rgba(0,0,0,.3);
  }
}
:root[data-theme="dark"]{
  color-scheme:dark;
  --bg:#0B1021; --paper:#131A31; --paper-2:#1A2241; --ink:#EEF1FA; --ink-2:#AEB5CD; --ink-3:#7F87A4;
  --line:#283157; --link:#9EB0FF; --btn:#FFB31F; --btn-ink:#1A1300; --focus:#9EB0FF;
  --good:#45C994; --good-soft:rgba(69,201,148,.14); --bad:#FF7C80; --bad-soft:rgba(255,124,128,.12); --warn:#FFC24D;
  --pro:#3FD2B4; --pro-soft:rgba(63,210,180,.14); --plus:#FFC24D; --plus-soft:rgba(255,179,31,.16);
  --b0:#93A6FF; --b1:#3FD2B4; --b2:#F49A55; --b3:#E37CD3; --b4:#B9CC4E; --b5:#62B5F3;
  --grid:rgba(160,180,255,.05);
  --shadow:0 1px 2px rgba(0,0,0,.35),0 8px 24px rgba(0,0,0,.3);
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{background:var(--bg)}
body{color:var(--ink);font-family:var(--f-body);font-size:15px;line-height:1.55;padding-inline:16px;padding-block:0 40px;
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:28px 28px}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
a{color:var(--link)}
:focus-visible{outline:2px solid var(--focus);outline-offset:2px}
h1,h2,h3{font-family:var(--f-display);font-weight:800;text-wrap:balance;margin:0;letter-spacing:-.02em;line-height:1.1}
h2{font-size:clamp(26px,3.2vw,36px)}
h3{font-size:18px;font-weight:600;letter-spacing:-.01em}
.wrap{max-width:1200px;margin:0 auto}
.eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:.1em;font-weight:600;color:var(--ink-3)}
.muted{color:var(--ink-3)}
.hint{font-size:13px;color:var(--ink-3)}

/* nav */
.nav{position:sticky;top:env(safe-area-inset-top,0px);z-index:10;margin-inline:-16px;padding-inline:16px;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;gap:14px;height:64px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}
.brand svg{flex:none}
.wordmark{font-family:var(--f-display);font-weight:800;font-size:22px;letter-spacing:-.03em}
.wordmark .ai{background:linear-gradient(transparent 58%,var(--sun) 58%,var(--sun) 92%,transparent 92%);padding:0 1px}
.links{display:flex;gap:2px;margin-left:12px}
.links a{text-decoration:none;color:var(--ink-2);font-weight:500;padding:8px 12px;border-radius:9px;font-size:14.5px;white-space:nowrap}
.links a:hover{color:var(--ink);background:var(--paper-2)}
.links a.on{color:var(--ink);background:var(--paper);box-shadow:var(--shadow)}
.links a.admin{color:var(--plus)}
.spacer{flex:1}
.me{display:flex;align-items:center;gap:8px;border:1px solid var(--line);background:var(--paper);border-radius:99px;padding:3px 10px 3px 3px;text-decoration:none;color:var(--ink);font-size:14px;font-weight:500;max-width:220px}
.me span.n{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.av{width:30px;height:30px;border-radius:50%;object-fit:cover;flex:none;background:var(--paper-2)}
.av.sm{width:24px;height:24px}
.av.lg{width:44px;height:44px}
.btn.menu-btn{display:none}
@media (max-width:900px){
  .links{position:fixed;left:0;right:0;top:calc(64px + env(safe-area-inset-top,0px));flex-direction:column;background:var(--paper);border-bottom:1px solid var(--line);padding:8px 16px 14px;margin:0;display:none;box-shadow:var(--shadow)}
  .links.open{display:flex}
  .btn.menu-btn{display:inline-flex}
  .me span.n{display:none}
}
.plan{display:inline-flex;align-items:center;font-size:11px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;border-radius:99px;padding:2px 8px;white-space:nowrap;line-height:1.5}
.plan.free{background:var(--paper-2);color:var(--ink-2)}
.plan.pro{background:var(--pro-soft);color:var(--pro)}
.plan.plus{background:var(--plus-soft);color:var(--plus)}
.plan.team{background:var(--navy);color:#fff}

/* buttons */
.btn{border:1px solid var(--line);background:var(--paper);border-radius:10px;padding:8px 14px;font-size:14px;font-weight:600;display:inline-flex;align-items:center;justify-content:center;gap:8px;text-decoration:none;color:var(--ink);white-space:nowrap}
.btn:hover{border-color:var(--ink-3)}
.btn.primary{background:var(--btn);border-color:var(--btn);color:var(--btn-ink)}
.btn.primary:hover{filter:brightness(1.12)}
.btn.sun{background:var(--sun);border-color:var(--sun);color:#1A1300}
.btn.sun:hover{filter:brightness(1.05)}
.btn.ghost{border-color:transparent;background:transparent;color:var(--link);padding-inline:6px}
.btn.danger{color:var(--bad)}
.btn.lg{padding:12px 20px;font-size:15.5px;border-radius:12px}
.btn.sm{padding:5px 10px;font-size:13px;border-radius:8px}
.btn.sq{width:34px;height:34px;padding:0}
.btn:disabled{opacity:.5;cursor:default;filter:none}
.card{background:var(--paper);border:1px solid var(--line);border-radius:16px}
.note{font-size:13.5px;color:var(--ink-2);background:var(--paper-2);border-radius:12px;padding:12px 14px}
.note.warn{background:var(--plus-soft);color:var(--ink)}
.err{color:var(--bad);background:var(--bad-soft);border-radius:10px;padding:10px 12px;font-size:14px}
input[type=text],input[type=search],textarea,select{border:1px solid var(--line);border-radius:10px;padding:9px 12px;background:var(--paper);width:100%}
select{width:auto;padding:7px 10px}
textarea{resize:vertical}
label.f{display:grid;gap:6px;font-size:13.5px;font-weight:600;color:var(--ink-2)}
.toast{position:fixed;left:50%;bottom:calc(20px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:10px 16px;border-radius:12px;font-size:14px;z-index:40;box-shadow:var(--shadow);max-width:calc(100% - 32px)}
main{padding-top:28px;min-height:60vh}
.spin{display:inline-block;width:12px;height:12px;border-radius:50%;border:2px solid currentColor;border-right-color:transparent;animation:sp .8s linear infinite;vertical-align:-1px}
@keyframes sp{to{transform:rotate(360deg)}}

/* home */
.hero{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center;padding-block:24px 56px}
@media (max-width:900px){.hero{grid-template-columns:1fr}}
.hero h1{font-size:clamp(38px,5.6vw,66px);margin:14px 0 18px}
.hero h1 .hl{background:linear-gradient(transparent 62%,var(--sun) 62%,var(--sun) 94%,transparent 94%);padding:0 4px}
.hero p.lead{font-size:18px;color:var(--ink-2);max-width:52ch;margin:0 0 26px}
.cta{display:flex;flex-wrap:wrap;gap:10px}
.stats{display:flex;flex-wrap:wrap;gap:28px;margin-top:34px}
.stats div b{display:block;font-family:var(--f-display);font-size:30px;font-weight:800;font-variant-numeric:tabular-nums;letter-spacing:-.02em}
.stats div span{font-size:13px;color:var(--ink-3)}
.chip-live{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--ink-2);background:var(--paper);border:1px solid var(--line);border-radius:99px;padding:5px 12px 5px 8px}
.chip-live i{width:8px;height:8px;border-radius:50%;background:var(--mint);box-shadow:0 0 0 3px var(--pro-soft)}
.art{position:relative;min-height:440px}
.art .c{position:absolute;background:var(--paper);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:16px}
.art .doc{left:0;top:18px;width:58%;transform:rotate(-3deg);animation:rise .7s ease-out both}
.art .map{right:0;top:0;width:66%;animation:rise .7s .15s ease-out both}
.art .quizc{left:12%;bottom:0;width:62%;transform:rotate(1.5deg);animation:rise .7s .3s ease-out both}
@keyframes rise{from{translate:0 18px}to{translate:0 0}}
@media (prefers-reduced-motion:reduce){.art .c,.spin{animation:none}}
.doc .fn{display:flex;align-items:center;gap:10px;font-weight:600;font-size:14px;margin-bottom:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ft{width:30px;height:36px;border-radius:6px;display:grid;place-items:center;font-family:var(--f-mono);font-size:9px;color:#fff;background:#5B6378;flex:none}
.ft.pdf{background:#C8414A}.ft.docx{background:#2F63C8}.ft.pptx{background:#C8642F}
.lines i{display:block;height:7px;border-radius:4px;background:var(--paper-2);margin:7px 0}
.lines i.m{background:var(--sun-soft)}
.map svg{width:100%;height:auto;display:block}
.quizc .q{font-weight:600;font-size:14px;margin:6px 0 10px}
.quizc .o{display:flex;gap:8px;align-items:center;font-size:13px;padding:7px 10px;border:1px solid var(--line);border-radius:9px;margin-top:6px}
.quizc .o.r{border-color:var(--good);background:var(--good-soft)}
.quizc .o b{font-family:var(--f-mono);font-size:11px;width:20px;height:20px;border-radius:5px;display:grid;place-items:center;background:var(--paper-2)}
.quizc .o.r b{background:var(--good);color:#fff}
.section{padding-block:40px}
.section-head{display:flex;flex-wrap:wrap;align-items:end;justify-content:space-between;gap:12px;margin-bottom:22px}
.section-head p{margin:8px 0 0;color:var(--ink-2);max-width:60ch}
.feats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
@media (max-width:980px){.feats{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:560px){.feats{grid-template-columns:1fr}}
.feat{padding:20px;display:grid;gap:10px;align-content:start}
.feat .ic{width:42px;height:42px;border-radius:12px;display:grid;place-items:center}
.feat p{margin:0;color:var(--ink-2);font-size:14.5px}
.ic.a{background:var(--sun-soft);color:var(--plus)}.ic.b{background:var(--pro-soft);color:var(--pro)}.ic.c{background:rgba(42,71,212,.12);color:var(--b0)}.ic.d{background:var(--bad-soft);color:var(--coral)}
.steps3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;counter-reset:s}
@media (max-width:760px){.steps3{grid-template-columns:1fr}}
.steps3 li{list-style:none;padding:18px 20px;display:grid;gap:6px}
.steps3 li::before{counter-increment:s;content:counter(s);font-family:var(--f-display);font-weight:800;font-size:28px;color:var(--sun);line-height:1}
.steps3 p{margin:0;color:var(--ink-2);font-size:14.5px}
footer{margin-top:40px;padding-top:24px;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;color:var(--ink-3);font-size:13.5px}

/* pricing */
.prices{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;align-items:stretch}
@media (max-width:900px){.prices{grid-template-columns:1fr}}
.price{padding:24px;display:flex;flex-direction:column;gap:14px;position:relative}
.price.pop{border:2px solid var(--sun);box-shadow:var(--shadow)}
.price .ribbon{position:absolute;top:-12px;left:24px;background:var(--sun);color:#1A1300;font-size:11.5px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;padding:3px 10px;border-radius:99px}
.price .amt{font-family:var(--f-display);font-weight:800;font-size:38px;letter-spacing:-.03em;font-variant-numeric:tabular-nums;line-height:1}
.price .amt small{font-family:var(--f-body);font-size:14px;font-weight:500;color:var(--ink-3);letter-spacing:0}
.price ul{margin:0;padding:0;list-style:none;display:grid;gap:8px;font-size:14.5px;flex:1}
.price li{display:grid;grid-template-columns:18px 1fr;gap:8px}
.price li svg{margin-top:4px}
.price .cur{font-size:13px;font-weight:600;color:var(--good);text-align:center}

/* study */
.study{display:grid;grid-template-columns:290px minmax(0,1fr);gap:20px;align-items:start}
@media (max-width:900px){.study{grid-template-columns:1fr}}
.side{display:flex;flex-direction:column;gap:14px}
.drop{position:relative;display:flex;flex-direction:column;align-items:center;text-align:center;gap:6px;padding:22px 16px;border:2px dashed var(--line);border-radius:16px;background:var(--paper);cursor:pointer;transition:border-color .15s,background .15s}
.drop:hover,.drop.over{border-color:var(--sun);background:var(--sun-soft)}
.drop strong{font-family:var(--f-display);font-weight:600;font-size:17px}
.drop small{color:var(--ink-3);font-size:12.5px}
.drop input{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}
.upicon{width:42px;height:42px;border-radius:12px;background:var(--navy);display:grid;place-items:center;color:#fff;margin-bottom:4px}
.meter{display:grid;gap:6px;padding:12px 14px}
.meter .row{display:flex;justify-content:space-between;font-size:13px;font-variant-numeric:tabular-nums}
.bar{height:6px;border-radius:99px;background:var(--paper-2);overflow:hidden}
.bar i{display:block;height:100%;background:var(--sun);border-radius:99px;transition:width .3s}
.lib{display:flex;flex-direction:column;gap:6px}
.lib-item{display:grid;grid-template-columns:30px 1fr auto;gap:10px;align-items:center;text-align:left;width:100%;padding:9px 10px;border-radius:12px;border:1px solid transparent;background:transparent;cursor:pointer}
.lib-item:hover{background:var(--paper)}
.lib-item.on{background:var(--paper);border-color:var(--line);box-shadow:var(--shadow)}
.lib-item .nm{font-weight:600;font-size:13.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.lib-item .st{font-size:12px;color:var(--ink-3);display:flex;align-items:center;gap:6px}
.lib-item .x{border:0;background:transparent;color:var(--ink-3);border-radius:6px;padding:2px 6px;font-size:12px}
.lib-item .x:hover{color:var(--bad);background:var(--bad-soft)}
.dot{width:8px;height:8px;border-radius:50%;background:var(--ink-3);display:inline-block}
.dot.ok{background:var(--good)}.dot.off{background:var(--bad)}.dot.wait{background:var(--sun)}
.paste{padding:10px 14px}
.paste summary{cursor:pointer;font-weight:600;font-size:14px}
.paste[open]{display:grid;gap:8px}
.work{display:flex;flex-direction:column;gap:16px;min-width:0}
.dochead{padding:22px 24px;display:flex;flex-direction:column;gap:12px}
.dochead h1{font-size:28px}
.meta{display:flex;flex-wrap:wrap;gap:6px 14px;color:var(--ink-3);font-size:13.5px;font-variant-numeric:tabular-nums;align-items:center}
.linkbtn{background:none;border:0;padding:0;color:var(--link);font-weight:600}
.summary{margin:0;padding-left:20px;display:grid;gap:4px;color:var(--ink-2);max-width:80ch}
.summary li::marker{color:var(--sun)}
.stepchips{display:flex;flex-wrap:wrap;gap:8px}
.stepc{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;padding:4px 10px;border-radius:99px;background:var(--paper-2);color:var(--ink-3)}
.stepc.done{color:var(--good);background:var(--good-soft)}.stepc.run{color:var(--plus);background:var(--plus-soft)}.stepc.fail{color:var(--bad);background:var(--bad-soft)}
.tabs{display:flex;gap:4px;padding:4px;background:var(--paper-2);border-radius:12px;width:max-content;max-width:100%;overflow-x:auto}
.tab{border:0;background:transparent;padding:8px 16px;border-radius:9px;font-weight:600;color:var(--ink-2);white-space:nowrap}
.tab.on{background:var(--paper);color:var(--ink);box-shadow:var(--shadow)}
.panel{padding:16px}
.toolbar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:12px}
.mm-wrap{position:relative;overflow:auto;border-radius:12px;background:radial-gradient(circle at 1px 1px,var(--line) 1px,transparent 0) 0 0/20px 20px,var(--paper);border:1px solid var(--line);height:min(560px,70vh);cursor:grab}
.mm-wrap.drag{cursor:grabbing;user-select:none}
.mm-wrap svg{display:block}
.mm-node,.mm-toggle{cursor:pointer}
.mm-node text{font-family:var(--f-body)}
.mm-sel{margin-top:12px;display:flex;flex-wrap:wrap;align-items:center;gap:10px;padding:10px 12px;border-radius:12px;background:var(--paper-2)}
.empty{display:grid;place-items:center;text-align:center;gap:10px;padding:48px 16px;color:var(--ink-3)}
.empty p{margin:0;max-width:52ch}
.quiz{max-width:740px}
.qprog{display:flex;align-items:center;gap:12px;font-size:13px;color:var(--ink-3);font-variant-numeric:tabular-nums;margin-bottom:14px}
.qprog .bar{flex:1}
.qtext{font-family:var(--f-display);font-weight:600;font-size:20px;line-height:1.35;margin-bottom:14px;letter-spacing:-.01em}
.opts{display:grid;gap:8px}
.opt{display:grid;grid-template-columns:30px 1fr;gap:10px;align-items:start;text-align:left;padding:12px;border:1px solid var(--line);border-radius:12px;background:var(--paper)}
.opt:hover:not(:disabled){border-color:var(--sun)}
.opt .k{width:28px;height:28px;border-radius:8px;display:grid;place-items:center;background:var(--paper-2);font-family:var(--f-mono);font-size:12px}
.opt:disabled{cursor:default}
.opt.right{border-color:var(--good);background:var(--good-soft)}.opt.right .k{background:var(--good);color:#fff}
.opt.wrong{border-color:var(--bad);background:var(--bad-soft)}.opt.wrong .k{background:var(--bad);color:#fff}
.explain{margin-top:14px;padding:12px 14px;border-radius:12px;background:var(--paper-2);display:grid;gap:8px}
.explain .v{font-weight:700}.explain .v.ok{color:var(--good)}.explain .v.no{color:var(--bad)}
.qnav{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px;align-items:center}
.score{display:flex;align-items:baseline;gap:12px;margin-bottom:6px}
.score b{font-family:var(--f-display);font-size:52px;font-weight:800;font-variant-numeric:tabular-nums;line-height:1;letter-spacing:-.03em}
.topics{display:grid;gap:10px;margin:16px 0}
.trow{display:grid;grid-template-columns:minmax(110px,200px) 1fr 52px;gap:10px;align-items:center;font-size:14px}
.trow .bar{height:8px}
.trow .bar i.lo{background:var(--bad)}.trow .bar i.mid{background:var(--sun)}.trow .bar i.hi{background:var(--good)}
.trow span:last-child{text-align:right;font-variant-numeric:tabular-nums;color:var(--ink-3)}
.wronglist{display:grid;gap:8px;margin:0 0 16px;padding:0;list-style:none}
.wronglist li{padding:10px 12px;border-radius:12px;border:1px solid var(--line);display:grid;gap:4px}
.wronglist .a{font-size:13.5px;color:var(--ink-2)}
.chat{display:flex;flex-direction:column;height:min(620px,74vh)}
.msgs{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:12px;padding:4px 2px 12px}
.msg{max-width:min(660px,92%);padding:10px 14px;border-radius:14px;line-height:1.6}
.msg.u{align-self:flex-end;background:var(--navy);color:#fff;border-bottom-right-radius:4px}
.msg.a{align-self:flex-start;background:var(--paper-2);border-bottom-left-radius:4px}
.msg.a p{margin:0 0 8px}.msg.a p:last-child{margin:0}
.msg.a ul,.msg.a ol{margin:0 0 8px;padding-left:20px}
.cite{display:inline-flex;align-items:center;font-family:var(--f-mono);font-size:11px;padding:1px 6px;margin:0 2px;border-radius:6px;border:1px solid var(--line);background:var(--paper);color:var(--link);vertical-align:1px}
.cite:hover{border-color:var(--link)}
.sugs{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}
.sug{border:1px solid var(--line);background:var(--paper);border-radius:99px;padding:6px 12px;font-size:13.5px}
.sug:hover{border-color:var(--sun)}
.compose{display:flex;gap:8px;align-items:flex-end;border-top:1px solid var(--line);padding-top:12px}
.compose textarea{flex:1;resize:none;min-height:46px;max-height:140px}

/* forum */
.forum{display:grid;grid-template-columns:220px minmax(0,1fr);gap:24px;align-items:start}
@media (max-width:900px){.forum{grid-template-columns:1fr}}
.cats{display:flex;flex-direction:column;gap:4px}
@media (max-width:900px){.cats{flex-direction:row;overflow-x:auto;padding-bottom:4px}}
.cat{display:flex;align-items:center;gap:10px;border:0;background:transparent;padding:8px 10px;border-radius:10px;text-align:left;font-weight:500;color:var(--ink-2);white-space:nowrap}
.cat:hover{background:var(--paper)}
.cat.on{background:var(--paper);color:var(--ink);box-shadow:var(--shadow);font-weight:600}
.cat i{width:10px;height:10px;border-radius:3px;flex:none}
.cat .n{margin-left:auto;font-size:12px;color:var(--ink-3);font-variant-numeric:tabular-nums}
.tag{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:600;padding:2px 9px;border-radius:99px;background:var(--paper-2);color:var(--ink-2)}
.tag i{width:7px;height:7px;border-radius:2px}
.threads{display:grid;gap:10px}
.thread{display:grid;grid-template-columns:44px 1fr auto;gap:14px;padding:16px 18px;text-align:left;width:100%;cursor:pointer;transition:border-color .15s,transform .15s}
.thread:hover{border-color:var(--sun)}
.thread h3{font-size:17px;margin:4px 0 4px}
.thread p{margin:0;color:var(--ink-2);font-size:14px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.thread .by{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-top:8px;font-size:13px;color:var(--ink-3)}
.thread .rc{text-align:center;font-variant-numeric:tabular-nums;color:var(--ink-3);font-size:12px;min-width:48px}
.thread .rc b{display:block;font-family:var(--f-display);font-size:22px;color:var(--ink)}
@media (max-width:560px){.thread{grid-template-columns:1fr auto}.thread>.av{display:none}}
.composer{padding:18px;display:grid;gap:12px}
.composer .row{display:grid;grid-template-columns:1fr 200px;gap:12px}
@media (max-width:560px){.composer .row{grid-template-columns:1fr}}
.post{padding:20px 22px;display:grid;gap:12px}
.post .body{white-space:pre-wrap;word-wrap:break-word;line-height:1.65}
.who{display:flex;align-items:center;gap:10px;font-size:14px}
.who b{font-weight:600}
.replies{display:grid;gap:10px;margin:14px 0}
.reply{padding:14px 16px;display:grid;gap:8px;border-left:3px solid var(--line)}
.reply.op{border-left-color:var(--sun)}
.reply .body{white-space:pre-wrap;word-wrap:break-word}
.toolbar-s{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-bottom:14px}
.toolbar-s input{max-width:320px}

/* admin */
.kpis{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-bottom:24px}
.kpi{padding:16px 18px}
.kpi b{display:block;font-family:var(--f-display);font-size:30px;font-weight:800;font-variant-numeric:tabular-nums;letter-spacing:-.02em;line-height:1.15;margin-top:4px}
.kpi .s{font-size:12.5px;color:var(--ink-3)}
.kpi.accent{background:var(--navy);border-color:var(--navy);color:#fff}
.kpi.accent .eyebrow,.kpi.accent .s{color:rgba(255,255,255,.7)}
.mix{display:flex;height:10px;border-radius:99px;overflow:hidden;background:var(--paper-2);margin-top:10px}
.mix i{display:block;height:100%}
.tablewrap{overflow-x:auto;border:1px solid var(--line);border-radius:14px;background:var(--paper)}
table{border-collapse:collapse;width:100%;font-size:14px}
th,td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--line);vertical-align:middle;white-space:nowrap}
th{font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--ink-3);font-weight:600;background:var(--paper-2)}
tr:last-child td{border-bottom:0}
td.num{font-variant-numeric:tabular-nums;text-align:right}
.person{display:flex;align-items:center;gap:10px}
.person div{display:grid;line-height:1.3}
.person small{color:var(--ink-3);font-size:12.5px}
.admin-grid{display:grid;gap:28px}

/* modal/drawer */
.scrim{position:fixed;inset:0;background:rgba(8,10,24,.45);z-index:30}
.drawer{position:fixed;top:0;right:0;bottom:0;width:min(520px,100%);background:var(--paper);border-left:1px solid var(--line);z-index:31;display:flex;flex-direction:column;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
.dhead{display:flex;align-items:center;gap:8px;padding:14px 16px;border-bottom:1px solid var(--line)}
.dhead h3{flex:1;font-size:16px}
.dbody{padding:16px 20px;overflow-y:auto;white-space:pre-wrap;line-height:1.7}
.dbody mark{background:var(--sun-soft);color:inherit;border-radius:3px;padding:0 1px}
.pg{font-family:var(--f-mono);font-size:12px;color:var(--ink-3)}
.modal{position:fixed;z-index:31;left:50%;top:50%;transform:translate(-50%,-50%);width:min(480px,calc(100% - 32px));max-height:calc(100% - 40px);overflow:auto;padding:24px;display:grid;gap:14px}
.profile-top{display:flex;gap:14px;align-items:center}

/* ===== bổ sung cho bản chạy thật ===== */
.auth{max-width:440px;margin:24px auto;padding:28px;display:grid;gap:16px}
.auth h2{font-size:30px}
.auth form{display:grid;gap:12px}
.auth .alt{font-size:14px;color:var(--ink-2);text-align:center}
.divider{display:flex;align-items:center;gap:10px;color:var(--ink-3);font-size:12.5px}
.divider::before,.divider::after{content:"";flex:1;height:1px;background:var(--line)}
input[type=email],input[type=password],input[type=number]{border:1px solid var(--line);border-radius:10px;padding:9px 12px;background:var(--paper);width:100%}
.ok-note{color:var(--good);background:var(--good-soft);border-radius:10px;padding:10px 12px;font-size:14px}
.acts{display:flex;align-items:center;gap:8px}
.subtabs{display:flex;gap:4px;padding:4px;background:var(--paper-2);border-radius:12px;width:max-content;max-width:100%;overflow-x:auto;margin-bottom:20px}
.subtabs button{border:0;background:transparent;padding:8px 14px;border-radius:9px;font-weight:600;color:var(--ink-2);white-space:nowrap}
.subtabs button.on{background:var(--paper);color:var(--ink);box-shadow:var(--shadow)}
.subtabs .cnt{display:inline-grid;place-items:center;min-width:20px;height:20px;padding:0 6px;border-radius:99px;background:var(--sun);color:#1A1300;font-size:11.5px;margin-left:6px}
td input[type=text],td input[type=number],td select{padding:6px 8px;font-size:13.5px}
td input.model{min-width:260px;font-family:var(--f-mono);font-size:12.5px}
td input.num{width:96px}
.status{font-size:12px;font-weight:700;border-radius:99px;padding:2px 8px}
.status.active{background:var(--good-soft);color:var(--good)}
.status.banned{background:var(--bad-soft);color:var(--bad)}
.status.pending{background:var(--plus-soft);color:var(--plus)}
.pay{display:grid;gap:8px;padding:16px;border-radius:12px;background:var(--paper-2);font-size:14.5px}
.pay code{font-family:var(--f-mono);background:var(--paper);border:1px solid var(--line);border-radius:6px;padding:2px 6px}
.mm-edit{margin-top:12px;display:grid;gap:10px;padding:12px;border-radius:12px;background:var(--paper-2)}
.mm-edit .row{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.mm-edit input{flex:1;min-width:200px}
.save-state{font-size:12.5px;color:var(--ink-3)}
.save-state.dirty{color:var(--warn)}
.kbd{font-family:var(--f-mono);font-size:11px;border:1px solid var(--line);border-bottom-width:2px;border-radius:5px;padding:0 5px;background:var(--paper)}
.mm-wrap:focus-visible{outline:2px solid var(--sun);outline-offset:2px}
.modelpill{font-family:var(--f-mono);font-size:11px;color:var(--ink-3)}
.pinned{color:var(--plus);font-weight:700;font-size:12px}
input[type=date]{border:1px solid var(--line);border-radius:10px;padding:6px 8px;background:var(--paper);font-size:13.5px}
/* thương hiệu F&D Education */
.wordmark{white-space:nowrap}
.wordmark .amp{color:var(--plus);margin:0 1px}
.wordmark .edu{font-weight:600;font-size:.78em;color:var(--ink-2);letter-spacing:-.01em}
@media (max-width:420px){.wordmark .edu{display:none}}