@font-face{font-family:"Geist";src:url("/assets/fonts/Geist.woff2") format("woff2");font-weight:100 900;font-style:normal;font-display:swap}
@font-face{font-family:"Geist Mono";src:url("/assets/fonts/GeistMono.woff2") format("woff2");font-weight:100 900;font-style:normal;font-display:swap}

/* Layout: v0 / Geist docs language — monochrome canvas, hairline borders, black primary actions; the lessons area is a docs layout with a sticky sidebar. */
:root{
  --bg:#FFFFFF; --bg-2:#FAFAFA; --fg:#0A0A0A; --muted:#666666; --faint:#8F8F8F;
  --line:#EBEBEB; --line-2:#D9D9D9; --btn:#0A0A0A; --btn-ink:#FFFFFF; --hover:#F2F2F2;
  --link:#0068D6; --link-soft:#EAF3FF; --green:#107D32; --green-soft:#EBF8EE; --red:#CA2A30; --red-soft:#FFEDEE;
  --f-display:"Geist", "Inter", system-ui, sans-serif;
  --f-body:"Geist", "Inter", system-ui, sans-serif;
  --f-mono:"Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --r:6px; --r-lg:12px;
  --ee-fg:#0A0A0A; --ee-soft:#737373; --ee-tile:#0A0A0A; --ee-ink:#FFFFFF; --ee-dot:#62C073; --ee-ok:#107D32;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#0A0A0A; --bg-2:#111111; --fg:#EDEDED; --muted:#A1A1A1; --faint:#7A7A7A;
  --line:#1F1F1F; --line-2:#2E2E2E; --btn:#EDEDED; --btn-ink:#0A0A0A; --hover:#1A1A1A;
  --link:#52A8FF; --link-soft:#0B2340; --green:#62C073; --green-soft:#0F2E18; --red:#FF6166; --red-soft:#3C1618; --ee-fg:#EDEDED; --ee-soft:#A1A1A1; --ee-tile:#EDEDED; --ee-ink:#0A0A0A; --ee-dot:#107D32; --ee-ok:#62C073; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0A0A0A; --bg-2:#111111; --fg:#EDEDED; --muted:#A1A1A1; --faint:#7A7A7A;
  --line:#1F1F1F; --line-2:#2E2E2E; --btn:#EDEDED; --btn-ink:#0A0A0A; --hover:#1A1A1A;
  --link:#52A8FF; --link-soft:#0B2340; --green:#62C073; --green-soft:#0F2E18; --red:#FF6166; --red-soft:#3C1618; --ee-fg:#EDEDED; --ee-soft:#A1A1A1; --ee-tile:#EDEDED; --ee-ink:#0A0A0A; --ee-dot:#107D32; --ee-ok:#62C073; color-scheme:dark}

*{box-sizing:border-box}
body{background:var(--bg);color:var(--fg);font:15px/1.6 var(--f-body);-webkit-font-smoothing:antialiased}
.wrap{max-width:1200px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
h1,h2,h3{font-family:var(--f-display);line-height:1.15;text-wrap:balance;margin:0;font-weight:600}
h1{font-size:clamp(2.2rem,5.2vw,3.6rem);letter-spacing:-.045em;font-weight:600}
h2{font-size:clamp(1.5rem,3vw,2rem);letter-spacing:-.03em}
h3{font-size:1.05rem;letter-spacing:-.01em}
p{margin:0}
.mark{font-family:var(--f-mono);font-size:.88em;background:var(--bg-2);border:1px solid var(--line);border-radius:5px;padding:.05em .35em}
h1 .soft,h2 .soft{color:var(--faint)}
.label{font:500 .72rem/1 var(--f-mono);letter-spacing:.04em;text-transform:uppercase;color:var(--muted)}
.muted{color:var(--muted)}
kbd{font:500 .72rem/1 var(--f-mono);border:1px solid var(--line-2);border-bottom-width:2px;border-radius:4px;padding:2px 5px;color:var(--muted);background:var(--bg)}
button{font:inherit;color:inherit;cursor:pointer}
:focus-visible{outline:2px solid var(--link);outline-offset:2px;border-radius:6px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid var(--btn);border-radius:var(--r);height:40px;padding:0 16px;font-weight:500;font-size:.92rem;background:var(--btn);color:var(--btn-ink);transition:opacity .12s,background .12s}
.btn:hover{opacity:.86}
.btn.ghost{background:var(--bg);color:var(--fg);border-color:var(--line-2)}
.btn.ghost:hover{background:var(--hover);opacity:1}
.btn.small{height:32px;padding:0 12px;font-size:.85rem}

/* header */
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:10;background:var(--bg)}
header.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:5;background:color-mix(in srgb,var(--bg) 85%,transparent);backdrop-filter:saturate(1.6) blur(10px);border-bottom:1px solid var(--line)}
header.top .wrap{display:flex;align-items:center;gap:16px;height:60px}
.logo{display:flex;align-items:center;gap:9px;font:600 1rem/1 var(--f-display);letter-spacing:-.02em;color:var(--fg);background:none;border:0;padding:0}
.logo .caret{display:grid;place-items:center;width:24px;height:24px;border-radius:6px;background:var(--btn);color:var(--btn-ink);font:600 .95rem/1 var(--f-mono)}
.logo .slash{color:var(--line-2);font-weight:300;font-size:1.3rem;margin-left:2px}
.logo .tag{font:500 .8rem var(--f-body);color:var(--muted)}
nav.links{display:flex;gap:2px;margin-left:12px;flex-wrap:wrap}
nav.links button{background:none;border:0;padding:6px 10px;border-radius:6px;font-size:.88rem;color:var(--muted)}
nav.links button:hover{color:var(--fg);background:var(--hover)}
nav.links button[aria-current="page"]{color:var(--fg)}
.hdr-right{margin-left:auto;display:flex;align-items:center;gap:10px}
.pts{font:500 .78rem/1 var(--f-mono);height:32px;display:inline-flex;align-items:center;padding:0 10px;border-radius:var(--r);border:1px solid var(--line);color:var(--muted);white-space:nowrap}
@media (max-width:720px){nav.links .hide-sm,.logo .slash,.logo .tag,.pts{display:none}}

/* hero */
.hero{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;padding-block:72px 48px}
.hero>*{min-width:0}
.pill{display:inline-flex;align-items:center;gap:8px;height:28px;padding:0 12px;border:1px solid var(--line);border-radius:999px;font-size:.8rem;color:var(--muted)}
.pill i{width:6px;height:6px;border-radius:50%;background:var(--green)}
.hero p.lede{font-size:1.1rem;color:var(--muted);max-width:33rem;margin-top:18px}
.hero .ctas{display:flex;gap:10px;flex-wrap:wrap;margin-top:28px}
.hero .note{margin-top:14px;font-size:.85rem}
@media (max-width:900px){.hero{grid-template-columns:1fr;gap:32px;padding-block:44px 24px}}
.grid-bg{background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:32px 32px;background-position:-1px -1px}

.sheet{background:var(--bg);border:1px solid var(--line);border-radius:var(--r-lg)}
.window{overflow:hidden;box-shadow:0 0 0 1px var(--line),0 12px 32px -12px rgba(0,0,0,.14);border:0}
.window .bar{display:flex;align-items:center;gap:8px;height:40px;padding:0 14px;border-bottom:1px solid var(--line);background:var(--bg-2)}
.window .bar span.dot{width:10px;height:10px;border-radius:50%;background:var(--line-2)}
.window .bar .label{margin-left:8px;text-transform:none;letter-spacing:0}
.demo .inner{padding:24px}
.demo .q{font:500 1.3rem/1.45 var(--f-body);letter-spacing:-.01em;margin:10px 0 14px}
.demo .q del{color:var(--red);text-decoration-thickness:1.5px}
.row{display:flex;gap:8px;flex-wrap:wrap}
input[type=text]{flex:1 1 220px;min-width:0;height:40px;font:400 .95rem var(--f-body);color:var(--fg);background:var(--bg);border:1px solid var(--line-2);border-radius:var(--r);padding:0 12px;transition:box-shadow .12s,border-color .12s}
input[type=text]:focus{outline:none;border-color:var(--faint);box-shadow:0 0 0 3px var(--hover)}

.fb{margin-top:14px;padding:12px 14px;border-radius:var(--r);font-size:.92rem;border:1px solid}
.fb.ok{background:var(--green-soft);border-color:color-mix(in srgb,var(--green) 30%,transparent)}
.fb.no{background:var(--red-soft);border-color:color-mix(in srgb,var(--red) 30%,transparent)}
.fb b{display:block;margin-bottom:2px;font-weight:600}
.fb.ok b{color:var(--green)} .fb.no b{color:var(--red)}

/* stats strip */
.proof{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-radius:var(--r-lg);margin-block:24px;overflow:hidden}
.proof div{padding:20px;border-left:1px solid var(--line);font-size:.85rem;color:var(--muted)}
.proof div:first-child{border-left:0}
.proof strong{display:block;font:600 1.6rem/1.1 var(--f-display);letter-spacing:-.03em;color:var(--fg);margin-bottom:4px;font-variant-numeric:tabular-nums}
@media (max-width:720px){.proof{grid-template-columns:1fr 1fr}.proof div:nth-child(3){border-left:0}.proof div:nth-child(n+3){border-top:1px solid var(--line)}}

section.band{padding-block:64px;border-top:1px solid var(--line)}
.section-head{max-width:40rem;display:grid;gap:10px;margin-bottom:32px}

.how{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden}
.how>div{padding:24px;border-left:1px solid var(--line);display:grid;gap:8px;align-content:start}
.how>div:first-child{border-left:0}
@media (max-width:760px){.how{grid-template-columns:1fr}.how>div{border-left:0;border-top:1px solid var(--line)}.how>div:first-child{border-top:0}}

/* curriculum */
.units{display:grid;gap:36px}
.unit h3{display:flex;align-items:baseline;gap:10px;margin-bottom:12px;scroll-margin-top:80px}
.lessons{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}
.lesson{display:grid;gap:6px;align-content:start;text-align:left;padding:16px;border-radius:var(--r-lg);background:var(--bg);border:1px solid var(--line);transition:border-color .12s,background .12s}
button.lesson:hover{border-color:var(--line-2);background:var(--bg-2)}
.lesson .t{font-weight:600;font-size:.98rem;letter-spacing:-.01em}
.lesson .d{font-size:.86rem;color:var(--muted)}
.lesson .meta{display:flex;justify-content:space-between;align-items:center;margin-top:8px;font-size:.85rem}
.chip{font:500 .7rem/1 var(--f-mono);padding:5px 8px;border-radius:999px;border:1px solid}
.chip.free{background:var(--link-soft);color:var(--link);border-color:transparent}
.chip.done{background:var(--green-soft);color:var(--green);border-color:transparent}
.chip.lock{color:var(--muted);border-color:var(--line)}
.lesson.locked{background:var(--bg-2);cursor:default}
.lesson.locked .t{color:var(--muted)}

/* pricing */
.plans{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden}
.plan{display:flex;flex-direction:column;gap:14px;padding:28px;border-left:1px solid var(--line)}
.plan:first-child{border-left:0}
.plan.feature{background:var(--bg-2)}
.plan .head{display:flex;justify-content:space-between;align-items:center}
.plan .price{font:600 2.2rem/1 var(--f-display);letter-spacing:-.04em;font-variant-numeric:tabular-nums}
.plan .price small{font:400 .85rem var(--f-body);letter-spacing:0;color:var(--muted)}
.plan ul{list-style:none;padding:0;margin:0;display:grid;gap:8px;flex:1;font-size:.92rem}
.plan li{padding-left:22px;position:relative}
.plan li::before{content:"";position:absolute;left:2px;top:.45em;width:9px;height:5px;border-left:1.5px solid var(--fg);border-bottom:1.5px solid var(--fg);transform:rotate(-45deg)}
@media (max-width:900px){.plans{grid-template-columns:1fr}.plan{border-left:0;border-top:1px solid var(--line)}.plan:first-child{border-top:0}}
.fine{font-size:.82rem;color:var(--muted);margin-top:14px}

footer{border-top:1px solid var(--line);padding-block:28px;margin-top:0;font-size:.85rem;color:var(--muted)}
footer .wrap{display:flex;flex-wrap:wrap;gap:12px 24px;justify-content:space-between}

/* docs layout (dashboard + lessons) */
.docs{display:grid;grid-template-columns:240px minmax(0,1fr);gap:48px}
.side{position:sticky;top:calc(60px + env(safe-area-inset-top,0px));align-self:start;max-height:calc(100vh - 60px);overflow:auto;padding-block:28px;border-right:1px solid var(--line);padding-right:16px}
.side h4{font:600 .8rem var(--f-body);margin:18px 0 6px;padding:0 10px}
.side h4:first-child{margin-top:0}
.side button{display:flex;justify-content:space-between;align-items:center;width:100%;text-align:left;background:none;border:0;padding:6px 10px;border-radius:6px;font-size:.88rem;color:var(--muted)}
.side button:hover{color:var(--fg);background:var(--hover)}
.side button[aria-current="page"]{color:var(--fg);background:var(--hover);font-weight:500}
.side .lk{display:block;padding:6px 10px;font-size:.88rem;color:var(--faint)}
.side .ok{color:var(--green);font-size:.8rem}
.docs-main{padding-block:28px 64px;min-width:0}
@media (max-width:900px){.docs{grid-template-columns:1fr;gap:0}.side{display:none}}
.crumbs{display:flex;gap:6px;align-items:center;font-size:.85rem;color:var(--muted);margin-bottom:14px}
.crumbs button{background:none;border:0;padding:0;color:var(--muted)}
.crumbs button:hover{color:var(--fg)}

.dash-head{display:grid;grid-template-columns:1fr auto;gap:20px;align-items:end;margin-bottom:32px}
.dash-head>*{min-width:0}
.stats{display:flex;border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden}
.stat{padding:12px 18px;border-left:1px solid var(--line);min-width:112px}
.stat:first-child{border-left:0}
.stat b{display:block;font:600 1.35rem/1.2 var(--f-display);letter-spacing:-.03em;font-variant-numeric:tabular-nums;margin-top:4px}
.levelbar{height:4px;border-radius:99px;background:var(--line);overflow:hidden;margin-top:6px}
.levelbar i{display:block;height:100%;background:var(--fg);transition:width .4s}
@media (max-width:760px){.dash-head{grid-template-columns:1fr}.stat{min-width:0;flex:1}}

/* lesson player */
.player{max-width:720px}
.player-top{display:flex;align-items:center;gap:14px;margin-bottom:20px}
.progress{flex:1;height:4px;background:var(--line);border-radius:99px;overflow:hidden}
.progress i{display:block;height:100%;background:var(--fg);transition:width .35s}
.card{padding:28px}
.card .prompt{font:600 1.2rem/1.35 var(--f-display);letter-spacing:-.02em;margin:10px 0 18px}
.learn p{margin-bottom:12px;max-width:62ch}
.learn .ex{font-family:var(--f-mono);font-size:.86rem;background:var(--bg-2);border:1px solid var(--line);border-radius:var(--r);padding:14px 16px;display:grid;gap:6px;margin:6px 0 16px;overflow-x:auto}
.sentence{display:flex;flex-wrap:wrap;gap:8px;font-size:1.15rem;margin-bottom:6px}
.word{border:1px solid var(--line-2);background:var(--bg);border-radius:var(--r);padding:6px 12px;font-weight:500;transition:background .12s}
.word:hover{background:var(--hover)}
.word.right{background:var(--green-soft);border-color:var(--green);color:var(--green)}
.word.wrong{background:var(--red-soft);border-color:var(--red);color:var(--red);text-decoration:line-through}
.blank-sent{font-size:1.2rem;font-weight:500;margin-bottom:16px}
.blank-sent .gap{display:inline-block;min-width:3.5em;border-bottom:1.5px dashed var(--faint);text-align:center;font-family:var(--f-mono);font-size:.85em;color:var(--muted)}
.opts{display:flex;gap:8px;flex-wrap:wrap}
.opt{border:1px solid var(--line-2);background:var(--bg);border-radius:var(--r);height:40px;padding:0 20px;font-weight:500}
.opt:hover{background:var(--hover)}
.opt.right{background:var(--green-soft);border-color:var(--green);color:var(--green)}
.opt.wrong{background:var(--red-soft);border-color:var(--red);color:var(--red)}
.faulty{font-size:1.1rem;font-weight:500;padding:12px 14px;border-radius:var(--r);background:var(--red-soft);border:1px solid color-mix(in srgb,var(--red) 25%,transparent);margin-bottom:14px}
.faulty s{text-decoration-color:var(--red)}
.actions{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:22px;flex-wrap:wrap}
.linkbtn{background:none;border:0;color:var(--link);font-size:.9rem;padding:4px 0}
.linkbtn:hover{text-decoration:underline;text-underline-offset:3px}
.shake{animation:shake .32s}
@keyframes shake{25%{transform:translateX(-4px)}75%{transform:translateX(4px)}}
.pop{animation:pop .3s}
@keyframes pop{from{opacity:.4;transform:translateY(3px)}}
@media (prefers-reduced-motion:reduce){.shake,.pop{animation:none}*{transition:none!important}}
.summary{text-align:center;display:grid;gap:12px;justify-items:center;padding-block:12px}
.summary .big{font:600 3.2rem/1 var(--f-display);letter-spacing:-.05em;font-variant-numeric:tabular-nums}

/* certificate */
.cert{position:relative;padding:48px 40px;text-align:center;display:grid;gap:14px;justify-items:center;overflow:hidden}
.cert .who{font:600 clamp(1.8rem,5vw,2.6rem)/1.1 var(--f-display);letter-spacing:-.04em;border-bottom:1px solid var(--line-2);padding:0 20px 10px;min-width:min(60%,420px)}
.cert .meta{display:flex;gap:24px;flex-wrap:wrap;justify-content:center;font:400 .78rem var(--f-mono);color:var(--muted);margin-top:8px}
.stamp{position:absolute;right:22px;top:22px;width:68px;height:68px;border-radius:50%;border:1px solid var(--line-2);color:var(--muted);display:grid;place-items:center;font:500 .6rem/1.2 var(--f-mono);text-align:center;letter-spacing:.06em;transform:rotate(-10deg)}
@media (max-width:520px){.cert{padding:64px 18px 30px}.stamp{width:56px;height:56px;right:14px;top:12px}}
.xbtn{background:none;border:1px solid var(--line);border-radius:var(--r);width:32px;height:32px;display:grid;place-items:center;font-size:1.1rem;line-height:1;color:var(--muted)}
.xbtn:hover{background:var(--hover);color:var(--fg)}
.how .n{font:500 .72rem var(--f-mono);color:var(--muted)}
.badge{font:500 .7rem/1 var(--f-mono);padding:5px 8px;border-radius:999px;background:var(--btn);color:var(--btn-ink)}
.secname{font:500 .82rem var(--f-body);color:var(--muted);margin:18px 0 10px}
.unit .secname:first-of-type{margin-top:0}
.side .lvl{font:500 .68rem var(--f-mono);letter-spacing:.06em;text-transform:uppercase;color:var(--faint);margin:26px 0 0;padding:0 10px}
.side h4{font-weight:500;color:var(--fg)}
.syllabus{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden}
.syllabus>div{padding:22px;border-left:1px solid var(--line);min-width:0}
.syllabus>div:first-child{border-left:0}
.syllabus .head{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:12px}
.syllabus ul{list-style:none;margin:0;padding:0;display:grid}
.syllabus li{display:flex;justify-content:space-between;gap:12px;padding:8px 0;border-top:1px solid var(--line);font-size:.92rem;font-variant-numeric:tabular-nums}
@media (max-width:860px){.syllabus{grid-template-columns:1fr}.syllabus>div{border-left:0;border-top:1px solid var(--line)}.syllabus>div:first-child{border-top:0}}
.stephead{display:flex;align-items:center;gap:10px}
.tier{font:500 .68rem/1 var(--f-mono);padding:4px 8px;border-radius:999px;border:1px solid var(--line-2);color:var(--muted)}
.tier.t1{color:var(--green);border-color:color-mix(in srgb,var(--green) 35%,transparent)}
.tier.t2{color:var(--link);border-color:color-mix(in srgb,var(--link) 35%,transparent)}
.tier.t3{color:var(--red);border-color:color-mix(in srgb,var(--red) 35%,transparent)}
.given{font-size:1.1rem;font-weight:500;padding:12px 14px;border-radius:var(--r);background:var(--bg-2);border:1px solid var(--line);margin-bottom:14px}
.opts.stack{flex-direction:column;align-items:stretch}
.opts.stack .opt{height:auto;min-height:44px;padding:10px 16px;text-align:left}
/* lesson page */
.lhead{display:grid;gap:8px;margin-bottom:8px}
.lhead h1{font-size:clamp(1.9rem,4.2vw,2.6rem)}
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin-top:18px;overflow-x:auto}
.tabs button{background:none;border:0;border-bottom:2px solid transparent;padding:10px 12px;font-size:.9rem;color:var(--muted);margin-bottom:-1px;white-space:nowrap}
.tabs button:hover{color:var(--fg)}
.tabs button[aria-selected="true"]{color:var(--fg);border-bottom-color:var(--fg);font-weight:500}
.lgrid{display:grid;grid-template-columns:minmax(0,1fr) 180px;gap:40px;margin-top:28px}
.lgrid:has(.toc[hidden]){grid-template-columns:minmax(0,1fr)}
.toc{position:sticky;top:calc(84px + env(safe-area-inset-top,0px));align-self:start;display:grid;gap:2px}
.toc .label{margin-bottom:8px}
.toc button{background:none;border:0;text-align:left;padding:4px 0;font-size:.85rem;color:var(--muted)}
.toc button:hover{color:var(--fg)}
@media (max-width:1100px){.lgrid{grid-template-columns:minmax(0,1fr)}.toc{display:none}}
.article{display:grid;gap:44px;max-width:720px}
.article section{scroll-margin-top:84px;display:grid;gap:14px;min-width:0}
.article h2{font-size:1.35rem;padding-bottom:10px;border-bottom:1px solid var(--line)}
.article .lead{font-size:1.08rem;line-height:1.65}
.related{display:flex;flex-wrap:wrap;align-items:center;gap:6px}
.related .label{margin-right:4px}
.rchip{background:var(--bg);border:1px solid var(--line);border-radius:999px;padding:4px 10px;font-size:.82rem;color:var(--muted)}
.rchip:hover{color:var(--fg);border-color:var(--line-2)}
.defn{border:1px solid var(--line);border-left:3px solid var(--fg);border-radius:0 var(--r) var(--r) 0;padding:14px 16px;background:var(--bg-2);display:grid;gap:6px}
.defn p{font-size:1.02rem}
.exlist{margin:0;padding-left:1.2em;display:grid;gap:8px}
.exlist li::marker{color:var(--faint)}
.points{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden}
.point{padding:18px;display:grid;gap:6px;align-content:start;border-top:1px solid var(--line);border-left:1px solid var(--line)}
.point:nth-child(-n+2){border-top:0}.point:nth-child(odd){border-left:0}
.point p{font-size:.93rem}
.point .eg{font-family:var(--f-mono);font-size:.82rem;color:var(--muted);background:var(--bg-2);border-radius:var(--r);padding:8px 10px}
@media (max-width:640px){.points{grid-template-columns:1fr}.point{border-left:0!important;border-top:1px solid var(--line)!important}.point:first-child{border-top:0!important}}
.tblwrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r-lg)}
table{border-collapse:collapse;width:100%;font-size:.9rem}
caption{caption-side:top;text-align:left;padding:12px 14px;font-size:.82rem;color:var(--muted);border-bottom:1px solid var(--line)}
th{text-align:left;font-weight:500;color:var(--muted);background:var(--bg-2);font-size:.8rem}
th,td{padding:10px 14px;border-bottom:1px solid var(--line);vertical-align:top}
tbody tr:last-child td{border-bottom:0}
.mistakes{display:grid;gap:10px}
.mistake{border:1px solid var(--line);border-radius:var(--r-lg);padding:14px 16px;display:grid;gap:6px}
.mistake p{display:flex;gap:10px;align-items:baseline}
.mistake .w s{color:var(--muted);text-decoration-color:var(--red)}
.mistake .note{font-size:.86rem;padding-left:30px;display:block}
.tag{flex:none;display:inline-grid;place-items:center;width:20px;height:20px;border-radius:50%;font-size:.7rem;font-weight:700}
.tag.no{background:var(--red-soft);color:var(--red)} .tag.yes{background:var(--green-soft);color:var(--green)}
.qc{margin:0;padding-left:1.4em;display:grid;gap:12px;font-variant-numeric:tabular-nums}
.qc li::marker{color:var(--muted);font-family:var(--f-mono);font-size:.85em}
.sol{margin-top:4px;color:var(--green);font-size:.9rem}
.sol::before{content:"→ ";color:var(--faint)}
#solBtn{justify-self:start}
.pairs td:first-child{width:45%}
.cta{display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between;padding:22px}
.cta>div{min-width:0;display:grid;gap:6px}
.cta h2{border:0;padding:0;font-size:1.2rem}
.pager{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:48px;max-width:720px}
.pg{display:grid;gap:4px;text-align:left;padding:14px 16px;border:1px solid var(--line);border-radius:var(--r-lg);background:var(--bg)}
.pg:hover{border-color:var(--line-2)}
.pg.next{text-align:right;grid-column:2}
.pg span:last-child{font-weight:500}
@media (max-width:520px){.pager{grid-template-columns:1fr}.pg.next{grid-column:1}}

/* ===== Additions for the multi-page site (layered on base.css tokens) ===== */
/* Base reset (the artifact host used to add these) */
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%}
body{margin:0}
img,svg{max-width:100%}
.btn{white-space:nowrap}
a{color:var(--link)}
.skip{position:absolute;left:-9999px;top:8px;z-index:50;background:var(--btn);color:var(--btn-ink);padding:8px 12px;border-radius:var(--r)}
.skip:focus{left:max(16px,env(safe-area-inset-left,0px))}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.mono{font-family:var(--f-mono);font-size:.9em}
.center{text-align:center;justify-content:center}
.between{justify-content:space-between}
.tiny{font-size:.75rem}
.narrow{max-width:760px}
.wrap.narrow{max-width:760px}
.page{padding-block:32px 72px}
.phead{display:grid;gap:12px;margin-bottom:36px;max-width:46rem}
.phead h1{font-size:clamp(2rem,4.6vw,2.9rem)}
.lede{font-size:1.06rem}
a.btn{text-decoration:none}
.btn.danger{background:var(--red);border-color:var(--red);color:#fff}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* header links */
nav.links a{padding:6px 10px;border-radius:6px;font-size:.88rem;color:var(--muted);text-decoration:none}
nav.links a:hover{color:var(--fg);background:var(--hover)}
.logo{text-decoration:none}
a.pts{text-decoration:none}
a.pts:hover{color:var(--fg)}
.acct{position:relative}
.avatar{width:32px;height:32px;border-radius:50%;border:1px solid var(--line-2);background:var(--btn);color:var(--btn-ink);font-weight:600;font-size:.85rem}
.menu{position:absolute;right:0;top:40px;min-width:220px;background:var(--bg);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:0 12px 32px -12px rgba(0,0,0,.25);padding:6px;display:grid;z-index:20}
.menu a,.menu button{display:block;text-align:left;background:none;border:0;padding:8px 10px;border-radius:6px;font-size:.9rem;color:var(--fg);text-decoration:none}
.menu a:hover,.menu button:hover{background:var(--hover)}
.menu .mhead{padding:8px 10px;font-size:.8rem;border-bottom:1px solid var(--line);margin-bottom:4px;word-break:break-all}
@media (max-width:420px){.hide-xs{display:none}}

/* breadcrumbs */
.crumbs ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:6px;font-size:.85rem;color:var(--muted)}
.crumbs li+li::before{content:"/";margin-right:6px;color:var(--faint)}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{color:var(--fg)}

/* lesson cards and sidebar as links */
a.lesson{text-decoration:none;color:var(--fg)}
a.lesson:hover{border-color:var(--line-2);background:var(--bg-2)}
a.lesson.done{border-color:color-mix(in srgb,var(--green) 35%,var(--line))}
.lesson .go{font-size:.85rem}
.chip.open{color:var(--link);border-color:color-mix(in srgb,var(--link) 35%,transparent)}
.chip.ai{background:var(--link-soft);color:var(--link);border-color:transparent;padding:3px 6px}
.unit h2{display:flex;align-items:baseline;gap:10px;margin-bottom:12px;scroll-margin-top:80px;font-size:1.3rem}
h3.secname{font:500 .82rem var(--f-body);color:var(--muted);margin:18px 0 10px}
.side a{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:6px 10px;border-radius:6px;font-size:.88rem;color:var(--muted);text-decoration:none}
.side a:hover{color:var(--fg);background:var(--hover)}
.side a[aria-current="page"]{color:var(--fg);background:var(--hover);font-weight:500}
.side .side-top{font-weight:500;color:var(--fg)}
.side .sh{font:500 .8rem var(--f-body);margin:14px 0 4px;padding:0 10px;color:var(--fg)}
.side .mini{font:500 .62rem var(--f-mono);color:var(--link);text-transform:uppercase}
.side .tick{color:var(--green);font-size:.8rem}
.toc a{padding:4px 0;font-size:.85rem;color:var(--muted);text-decoration:none}
.toc a:hover{color:var(--fg)}
.pg{text-decoration:none;color:var(--fg)}
.rchip{text-decoration:none}
.lmeta{display:flex;flex-wrap:wrap;gap:10px;align-items:center;font-size:.88rem}
.asec{scroll-margin-top:84px;display:grid;gap:14px;min-width:0}
.practice-sec{margin-top:8px}
.steptitle{font-size:1.2rem;margin:12px 0 14px}

/* paywall */
.paycard{padding:26px;display:grid;gap:14px;border:1px solid var(--line-2);background:linear-gradient(var(--bg-2),var(--bg))}
.paycard h2{border:0!important;padding:0!important;font-size:1.3rem}
.ticks{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.ticks li{padding-left:22px;position:relative}
.ticks li::before{content:"";position:absolute;left:2px;top:.45em;width:9px;height:5px;border-left:1.5px solid var(--green);border-bottom:1.5px solid var(--green);transform:rotate(-45deg)}

/* modal */
body.modal-open{overflow:hidden}
.modal-back{position:fixed;inset:0;z-index:40;background:rgba(0,0,0,.45);display:grid;place-items:center;padding:max(16px,env(safe-area-inset-top,0px)) max(16px,env(safe-area-inset-right,0px)) max(16px,env(safe-area-inset-bottom,0px)) max(16px,env(safe-area-inset-left,0px));animation:fade .15s}
@keyframes fade{from{opacity:0}}
.modal{position:relative;background:var(--bg);color:var(--fg);border:1px solid var(--line);border-radius:16px;width:min(460px,100%);max-height:calc(100dvh - 32px);overflow:auto;padding:28px 24px 24px;box-shadow:0 24px 64px -16px rgba(0,0,0,.4)}
.modal.wide{width:min(600px,100%)}
.mclose{position:absolute;right:12px;top:12px}
.mbody{display:grid;gap:14px}
.mbody h2{font-size:1.35rem;padding-right:28px}
.stack{display:grid;gap:10px}
.stack label,.grid2 label{font-size:.88rem;font-weight:500;display:grid;gap:6px}
input[type=email],select{height:40px;font:400 .95rem var(--f-body);color:var(--fg);background:var(--bg);border:1px solid var(--line-2);border-radius:var(--r);padding:0 12px;width:100%}
input[type=email]:focus,select:focus{outline:none;border-color:var(--faint);box-shadow:0 0 0 3px var(--hover)}
.stack input[type=text]{flex:none;width:100%}
#siCode{font-family:var(--f-mono);font-size:1.3rem;letter-spacing:.4em;text-align:center;height:48px}
.ferr{color:var(--red);font-size:.88rem;min-height:1px;margin:0}
.ferr:empty{display:none}
.signin{display:grid;gap:12px}

/* onboarding */
.onb{display:grid;gap:18px}
.onb-top{display:flex;justify-content:space-between;align-items:center;padding-right:36px}
.dots{display:flex;gap:6px}
.dots i{width:28px;height:4px;border-radius:99px;background:var(--line)}
.dots i.done,.dots i.on{background:var(--fg)}
.dots i.on{opacity:.55}
.onb-body{display:grid;gap:14px}
.onb-body h2{font-size:1.4rem;padding-right:0}
.opt-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.opt-card{display:grid;gap:4px;text-align:left;padding:14px;border-radius:var(--r-lg);border:1px solid var(--line-2);background:var(--bg);min-height:72px;transition:border-color .12s,background .12s}
.opt-card:hover{background:var(--hover)}
.opt-card.sel{border-color:var(--fg);box-shadow:inset 0 0 0 1px var(--fg)}
.opt-card .muted{font-size:.82rem}
@media (max-width:480px){.opt-cards{grid-template-columns:1fr}}
.qtext{font-weight:500!important;line-height:1.5}
.hl{background:var(--link-soft);color:var(--link);padding:0 .25em;border-radius:4px}

/* toast */
#toast{position:fixed;left:50%;bottom:calc(20px + env(safe-area-inset-bottom,0px));transform:translate(-50%,20px);background:var(--btn);color:var(--btn-ink);padding:10px 16px;border-radius:var(--r);font-size:.9rem;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;z-index:60;max-width:calc(100% - 32px)}
#toast.show{opacity:1;transform:translate(-50%,0)}

/* dashboard */
.dash{display:grid;gap:32px}
.dhead{display:flex;justify-content:space-between;align-items:end;gap:16px;flex-wrap:wrap}
.dhead h1{font-size:clamp(1.8rem,4vw,2.4rem);margin-top:8px}
.stats.wide{display:grid;grid-template-columns:repeat(4,minmax(0,1fr))}
.stats.wide .stat{min-width:0}
.stat b small{font-size:.8rem;color:var(--muted);font-weight:500;letter-spacing:0;margin-left:2px}
@media (max-width:760px){.stats.wide{grid-template-columns:repeat(2,minmax(0,1fr))}.stats.wide .stat:nth-child(3){border-left:0}.stats.wide .stat:nth-child(n+3){border-top:1px solid var(--line)}}
.dsec{display:grid;gap:12px}
.dsec h2{font-size:1.15rem}
.upnext{padding:22px;display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between}
.upnext>div:first-child{min-width:0;display:grid;gap:6px;flex:1 1 280px}
.banner{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;padding:14px 16px;border-radius:var(--r-lg);background:var(--link-soft);border:1px solid color-mix(in srgb,var(--link) 25%,transparent)}
.banner p{min-width:0;flex:1 1 260px}
.welcome{padding:32px;display:grid;gap:14px;max-width:640px}
.memb{padding:18px;display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between}
td.num{font-variant-numeric:tabular-nums;white-space:nowrap}
.grid2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.grid2 .row{grid-column:1/-1}
@media (max-width:560px){.grid2{grid-template-columns:1fr}}
.band.tight{padding-block:24px;border-top:1px solid var(--line);display:grid;gap:12px}
.band.tight h2{font-size:1.15rem}
.confirm{display:grid;gap:10px}

/* practice extras */
.fb.hint{background:var(--bg-2);border-color:var(--line)}
.fb.hint b{color:var(--fg)}
.review{text-align:left;width:100%;display:grid;gap:10px}
.review ul{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.review li{border:1px solid var(--line);border-radius:var(--r-lg);padding:12px 14px;display:grid;gap:4px}
.review .sol{margin:0}
.aibox{width:100%;text-align:left;padding:18px;display:flex;flex-wrap:wrap;gap:14px;align-items:center;justify-content:space-between}
.aibox>div{min-width:0;flex:1 1 260px;display:grid;gap:4px}
.loading{display:flex;gap:16px;align-items:center}
.spinner{flex:none;width:22px;height:22px;border-radius:50%;border:2.5px solid var(--line-2);border-top-color:var(--fg);animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion:reduce){.spinner{animation-duration:2s}}
.kbdhint{font-size:.8rem}
.stage:focus{outline:none}

/* pricing */
.plans.four{grid-template-columns:repeat(4,minmax(0,1fr))}
.plans.four .plan{padding:22px}
.plan .price s.was{font-size:1rem;color:var(--faint);font-weight:400;letter-spacing:0}
.plan .intl{font-size:.82rem;margin-top:-6px}
.plan .fine{margin-top:0}
@media (max-width:1100px){.plans.four{grid-template-columns:repeat(2,minmax(0,1fr))}.plans.four .plan:nth-child(3){border-left:0}.plans.four .plan:nth-child(n+3){border-top:1px solid var(--line)}}
@media (max-width:620px){.plans.four{grid-template-columns:1fr}.plans.four .plan{border-left:0;border-top:1px solid var(--line)}.plans.four .plan:first-child{border-top:0}}

/* FAQ */
.faq{display:grid;border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden}
.faq details{border-top:1px solid var(--line);padding:0 18px}
.faq details:first-child{border-top:0}
.faq summary{cursor:pointer;padding:16px 0;font-weight:500;list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::after{content:"+";color:var(--muted)}
.faq details[open] summary::after{content:"−"}
.faq summary::-webkit-details-marker{display:none}
.faq details p{padding-bottom:16px;color:var(--muted)}

/* prose pages */
.prose{display:grid;gap:14px}
.prose h1{font-size:clamp(1.9rem,4vw,2.5rem);margin:8px 0}
.prose h2{font-size:1.2rem;margin-top:12px}
.prose ul,.prose ol{margin:0;padding-left:1.3em;display:grid;gap:8px}
.note-box{padding:12px 14px;border-radius:var(--r);background:var(--bg-2);border:1px dashed var(--line-2);font-size:.88rem;color:var(--muted)}

/* footer */
footer{padding-block:40px 24px}
footer .fgrid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:28px}
footer nav{display:grid;gap:8px;align-content:start}
footer nav a{color:var(--muted);text-decoration:none;font-size:.88rem}
footer nav a:hover{color:var(--fg)}
footer .fbrand{display:grid;gap:10px;align-content:start;max-width:30ch}
footer .fbase{display:flex;flex-wrap:wrap;gap:8px 24px;justify-content:space-between;margin-top:28px;padding-top:18px;border-top:1px solid var(--line)}
@media (max-width:760px){footer .fgrid{grid-template-columns:1fr 1fr}footer .fbrand{grid-column:1/-1}}

/* Dark mode: dim the page behind dialogs properly and lift the dialog surface so it stands apart. */
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .modal-back{background:rgba(0,0,0,.72)} :root:not([data-theme="light"]) .modal{background:var(--bg-2);border-color:var(--line-2)}}
:root[data-theme="dark"] .modal-back{background:rgba(0,0,0,.72)}
:root[data-theme="dark"] .modal{background:var(--bg-2);border-color:var(--line-2)}

/* Small phones: keep the header inside the screen (no sideways scroll). */
@media (max-width:480px){
  header.top .wrap{gap:8px}
  nav.links{margin-left:0}
  .logo{font-size:.95rem}
  .hdr-right{gap:6px}
  .hdr-right .btn.small{padding-left:10px;padding-right:10px}
}
@media (max-width:360px){nav.links{display:none}}
@media (max-width:480px){.btn:not(.small){white-space:normal;height:auto;min-height:40px;padding-top:9px;padding-bottom:9px;line-height:1.3;text-align:center;max-width:100%}}

/* ===== Brand: Progress E mark and motion (ExerciseEnglish motion kit) ===== */
.logo.ee-nav{display:inline-flex;align-items:center;gap:10px;font:600 1.12rem/1 var(--f-body);letter-spacing:-.035em;color:var(--ee-fg);text-decoration:none;padding:6px 8px;margin-left:-8px;border-radius:8px}
.ee-soft{color:var(--ee-soft);transition:color .3s}
.ee-nav svg{flex:none;transition:transform .35s cubic-bezier(.2,.8,.2,1)}
.ee-nav__tile{fill:var(--ee-tile)}
.ee-nav__bar{fill:var(--ee-ink)}
.ee-nav__mid{transform-box:fill-box;transform-origin:left center;transition:transform .35s cubic-bezier(.2,.8,.2,1)}
.ee-nav__dot{fill:var(--ee-dot);transition:transform .35s cubic-bezier(.2,.8,.2,1)}
.ee-nav:hover svg,.ee-nav:focus-visible svg{transform:rotate(-6deg)}
.ee-nav:hover .ee-nav__mid,.ee-nav:focus-visible .ee-nav__mid{transform:scaleX(1.78)}
.ee-nav:hover .ee-nav__dot,.ee-nav:focus-visible .ee-nav__dot{transform:translateX(12px)}
.ee-nav:hover .ee-soft,.ee-nav:focus-visible .ee-soft{color:var(--ee-fg)}
footer .logo.ee-nav{font-size:1.05rem}

/* Hero intro: plays once on the home page */
.ee-intro{display:flex;width:max-content;margin-bottom:20px}
.ee-intro__tile{fill:var(--ee-tile);transform-box:fill-box;transform-origin:center;animation:ee-intro-tile .55s cubic-bezier(.2,.8,.2,1) both}
.ee-intro__bar{fill:var(--ee-ink);transform-box:fill-box;transform-origin:left center;animation:ee-intro-bar .45s cubic-bezier(.2,.8,.2,1) .25s both}
.ee-intro__bar:nth-of-type(3){animation-delay:.35s}
.ee-intro__bar:nth-of-type(4){animation-delay:.45s}
.ee-intro__dot{fill:var(--ee-dot);transform-box:fill-box;transform-origin:center;animation:ee-intro-dot .45s cubic-bezier(.3,1.6,.5,1) .7s both}
@keyframes ee-intro-tile{from{opacity:0;transform:scale(.6) rotate(-8deg)}}
@keyframes ee-intro-bar{from{transform:scaleX(0)}}
@keyframes ee-intro-dot{from{transform:scale(0)}}

/* Loader: lesson loading, answer checking */
.ee-load{display:inline-flex;flex:none}
.ee-load__tile{fill:var(--ee-tile)}
.ee-load__track{fill:var(--ee-ink);opacity:.2}
.ee-load__bar{fill:var(--ee-ink);transform-box:fill-box;transform-origin:left center;animation:ee-load-bar 1.8s cubic-bezier(.6,0,.3,1) infinite}
.ee-load__bar:nth-of-type(6){animation-delay:.15s}
.ee-load__bar:nth-of-type(7){animation-delay:.3s}
.ee-load__dot{fill:var(--ee-dot);transform-box:fill-box;transform-origin:center;animation:ee-load-dot 1.8s cubic-bezier(.3,1.4,.5,1) infinite}
@keyframes ee-load-bar{0%{transform:scaleX(0);opacity:1}40%,80%{transform:scaleX(1);opacity:1}100%{transform:scaleX(1);opacity:0}}
@keyframes ee-load-dot{0%,40%{transform:scale(0)}55%,82%{transform:scale(1)}100%{transform:scale(0)}}
.ee-loading{display:flex;gap:14px;align-items:center;padding:18px;color:var(--muted)}

/* Correct answer: the tile turns green and the E completes */
.ee-done{display:inline-flex;border-radius:22%;flex:none}
.ee-done__tile{fill:var(--ee-tile);transition:fill .3s}
.ee-done__bar{fill:var(--ee-ink)}
.ee-done__mid{transform-box:fill-box;transform-origin:left center;transition:transform .4s cubic-bezier(.2,.8,.2,1) .1s}
.ee-done__dot{fill:var(--ee-dot);transform-box:fill-box;transform-origin:center;transition:transform .2s}
.ee-done.is-done{animation:ee-done-ring .7s ease-out,ee-done-pop .45s cubic-bezier(.3,1.6,.5,1)}
.ee-done.is-done .ee-done__tile{fill:var(--ee-ok)}
.ee-done.is-done .ee-done__mid{transform:scaleX(1.78)}
.ee-done.is-done .ee-done__dot{transform:scale(0)}
@keyframes ee-done-ring{from{box-shadow:0 0 0 0 rgba(16,125,50,.45)}to{box-shadow:0 0 0 14px rgba(16,125,50,0)}}
@keyframes ee-done-pop{40%{transform:scale(1.08)}}
.fb.ok.has-mark{display:grid;grid-template-columns:auto 1fr;column-gap:12px;align-items:start}
.fb.ok.has-mark>.ee-done{grid-row:1/span 9;margin-top:1px}
.summary .ee-done{margin-bottom:6px}

@media (prefers-reduced-motion:reduce){.ee-intro *,.ee-load *,.ee-done,.ee-done *,.ee-nav *{animation:none!important;transition:none!important}}

/* Sign-in: Google button and divider */
.btn.google{background:var(--bg);color:var(--fg);border-color:var(--line-2);gap:10px}
.btn.google:hover{background:var(--hover);opacity:1}
.btn.google svg{width:18px;height:18px;flex:none}
.or{display:flex;align-items:center;gap:10px;color:var(--faint);font:500 .72rem/1 var(--f-mono);text-transform:uppercase;letter-spacing:.06em;margin:4px 0}
.or::before,.or::after{content:"";flex:1;height:1px;background:var(--line)}

/* Worked example (free Exercise 1 on Premium lessons) */
.worked { padding: 18px 20px; }
.worked .label { margin: 0 0 6px; }
.worked .task { font-size: 1.08rem; margin: 10px 0; }
.worked .ans { display: flex; gap: 10px; align-items: baseline; margin: 10px 0; }
.worked .ans .tag.yes { color: var(--ok, #1a7f4b); font-weight: 700; }
.worked .fill { background: color-mix(in srgb, var(--accent, #2b6) 18%, transparent); padding: 0 4px; border-radius: 4px; }

/* Free reference pages (tense chart, irregular verbs) */
.ref .phead .row { margin-top: 14px; }
.ref .asec { margin-top: 36px; }
.ref .asec > h2 { margin-bottom: 12px; }
.jump { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0 4px; }
.jump a { font-size: .85rem; padding: 6px 12px; border: 1px solid var(--line); border-radius: 999px; text-decoration: none; color: inherit; }
.jump a:hover { background: var(--bg-2); }
.tchart th[scope="row"] { color: inherit; font-weight: 600; white-space: nowrap; background: none; font-size: .9rem; }
.tchart td { min-width: 150px; vertical-align: top; }
.tcards { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.tcard { padding: 16px 18px; display: grid; gap: 8px; align-content: start; }
.tcard h3 { margin: 0; font-size: 1.05rem; }
.tcard p { margin: 0; }
.tcard .formula code { font-family: var(--mono, ui-monospace, monospace); font-size: .85rem; background: var(--bg-2); padding: 3px 6px; border-radius: 6px; display: inline-block; }
.tcard .tex { margin: 0; padding-left: 1.1em; display: grid; gap: 4px; }
.ref .mistakes { display: grid; gap: 12px; }
.ref .cta { margin-top: 36px; }
.vfilter { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-bottom: 12px; }
.vfilter input { flex: 1 1 220px; max-width: 360px; }
.vtable td:first-child { font-weight: 600; }
.vgroup { display: flex; flex-wrap: wrap; gap: 6px 8px; margin: 6px 0 18px; }
.vgroup span { font-size: .88rem; padding: 4px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg-2); }
.vnotes { display: grid; gap: 4px 0; margin: 0; }
.vnotes dt { font-weight: 600; margin-top: 10px; }
.vnotes dd { margin: 0; }
@media print {
  header.top, footer, .noprint, .ref .cta, .ref .band, .crumbs { display: none !important; }
  .ref .asec { break-inside: auto; margin-top: 18px; }
  .tcard, .mistake, .tchart tr, .vtable tr { break-inside: avoid; }
  .tblwrap { overflow: visible; border: none; }
  body { background: #fff; color: #000; }
}