:root{
  --ink:#14112B; --ink2:#46415F; --mute:#7C7896; --line:#E4E0F2; --mist:#F4F2FB; --paper:#fff;
  --vio:#5B2EFF; --vio-d:#4320D6; --vio-l:#EEE9FF; --marker:#FFB020; --live:#FF3D6E; --ok:#0FA88F;
  --r:14px; --max:1180px;
  --display:"Bricolage Grotesque",system-ui,sans-serif;
  --body:"Plus Jakarta Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"JetBrains Mono",ui-monospace,Menlo,monospace;
  --hand:"Caveat",cursive;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--body);font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased}
img,svg{max-width:100%;display:block}
a{color:var(--vio);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--vio-d)}
:focus-visible{outline:3px solid var(--marker);outline-offset:2px;border-radius:4px}
h1,h2,h3{font-family:var(--display);line-height:1.08;letter-spacing:-.02em;margin:0 0 .5em;color:var(--ink)}
h1{font-size:clamp(2.3rem,5.4vw,4.1rem);font-weight:800}
h2{font-size:clamp(1.7rem,3.2vw,2.5rem);font-weight:750}
h3{font-size:1.22rem;font-weight:700;letter-spacing:-.01em}
p{margin:0 0 1em}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
.narrow{max-width:780px}
.eyebrow{font-family:var(--mono);font-size:.74rem;letter-spacing:.16em;text-transform:uppercase;color:var(--vio);font-weight:600;margin-bottom:14px;display:block}
.lede{font-size:1.18rem;color:var(--ink2);max-width:640px}
.mute{color:var(--mute)}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;background:#fff;padding:8px 12px;z-index:99}

/* header */
.hdr{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.hdr .wrap{display:flex;align-items:center;gap:28px;height:68px}
.logo{display:flex;align-items:center;gap:9px;font-family:var(--display);font-weight:800;font-size:1.28rem;color:var(--ink);text-decoration:none;letter-spacing:-.02em}
.logo svg{width:30px;height:30px}
.nav{display:flex;gap:4px;align-items:center;margin-left:auto}
.nav a,.nav summary{color:var(--ink);text-decoration:none;font-size:.95rem;font-weight:600;padding:8px 12px;border-radius:9px;cursor:pointer;list-style:none}
.nav summary::-webkit-details-marker{display:none}
.nav a:hover,.nav summary:hover{background:var(--mist)}
.nav details{position:relative}
.nav .dd{position:absolute;top:44px;left:0;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:0 18px 40px -18px rgba(20,17,43,.35);padding:8px;min-width:250px;display:grid}
.nav .dd a{font-weight:500;padding:8px 12px}
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--vio);color:#fff !important;text-decoration:none;font-weight:700;font-size:.98rem;padding:12px 20px;border-radius:11px;border:0;cursor:pointer;font-family:var(--body);transition:background .15s,transform .15s}
.btn:hover{background:var(--vio-d);transform:translateY(-1px)}
.btn.ghost{background:transparent;color:var(--ink) !important;box-shadow:inset 0 0 0 1.5px var(--line)}
.btn.ghost:hover{background:var(--mist)}
.btn.sm{padding:9px 15px;font-size:.92rem}
.menu-t{display:none}

/* hero */
.hero{padding:72px 0 56px;overflow:hidden}
.hero .grid{display:grid;grid-template-columns:1.02fr 1fr;gap:56px;align-items:center}
.hero h1 .hl{position:relative;white-space:nowrap}
.hero h1 .hl svg{position:absolute;left:-4%;bottom:-.16em;width:108%;height:.42em;overflow:visible}
.hero .ctas{display:flex;gap:12px;flex-wrap:wrap;margin:28px 0 22px}
.proof{display:flex;gap:22px;flex-wrap:wrap;font-size:.92rem;color:var(--ink2)}
.proof b{color:var(--ink)}
.mark-path{fill:none;stroke:var(--marker);stroke-width:9;stroke-linecap:round;stroke-dasharray:420;stroke-dashoffset:420;animation:draw 1.1s .5s cubic-bezier(.6,.1,.3,1) forwards}
@keyframes draw{to{stroke-dashoffset:0}}

/* signature: the live board */
.board{position:relative;background:#fff;border-radius:18px;box-shadow:0 1px 0 var(--line),0 40px 80px -40px rgba(42,22,140,.45);border:1px solid var(--line);aspect-ratio:16/12}
.board .bar{display:flex;align-items:center;gap:10px;padding:12px 16px;border-bottom:1px solid var(--line);font-size:.8rem;color:var(--ink2);font-weight:600}
.live{display:inline-flex;align-items:center;gap:6px;background:var(--live);color:#fff;font-family:var(--mono);font-size:.68rem;letter-spacing:.12em;padding:3px 8px;border-radius:6px}
.live i{width:7px;height:7px;border-radius:50%;background:#fff;animation:pulse 1.4s infinite}
@keyframes pulse{50%{opacity:.25}}
.board .bar .w{margin-left:auto;font-family:var(--mono);font-size:.74rem;color:var(--mute)}
.board .slide{position:absolute;inset:46px 0 0 0;padding:22px 26px}
.board .slide h4{font-family:var(--display);font-size:1.25rem;margin:0 0 4px}
.board .slide .sub{font-size:.82rem;color:var(--mute);margin-bottom:12px}
.board .inkable{max-width:78%}
.board .ink{fill:none;stroke:var(--marker);stroke-width:4;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:900;stroke-dashoffset:900;animation:draw 1.4s forwards}
.board .ink.red{stroke:var(--live)}
.board .hand{font-family:var(--hand);font-size:28px;fill:var(--live);opacity:0;animation:fade .4s forwards}
@keyframes fade{to{opacity:1}}
.board .cam{position:absolute;right:18px;bottom:18px;width:21%;aspect-ratio:1;border-radius:50%;background:linear-gradient(160deg,#3b2a9a,#14112B);border:4px solid #fff;box-shadow:0 10px 24px -8px rgba(0,0,0,.4);overflow:hidden}
.board .tools{position:absolute;left:14px;bottom:16px;display:flex;gap:6px}
.board .tools span{width:32px;height:32px;border-radius:8px;background:var(--mist);display:grid;place-items:center;color:var(--ink2)}
.board .tools svg{width:16px;height:16px}
.board .tools span.on{background:var(--marker);color:var(--ink)}
.board .chat{position:absolute;right:-18px;top:92px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:9px 12px;font-size:.78rem;box-shadow:0 12px 30px -14px rgba(20,17,43,.4);max-width:190px;animation:pop .5s 2.2s both}
.board .chat b{display:block;font-size:.72rem;color:var(--vio)}
@keyframes pop{from{opacity:0;transform:translateY(8px)}}

/* hero stage: class ↔ meeting */
.stage-tabs{display:inline-flex;gap:4px;background:var(--mist);border:1px solid var(--line);border-radius:12px;padding:4px;margin-bottom:16px}
.stage-tabs button{font:inherit;font-size:.88rem;font-weight:700;border:0;background:none;color:var(--ink2);padding:7px 14px;border-radius:9px;cursor:pointer}
.stage-tabs button[aria-selected="true"]{background:#fff;color:var(--vio);box-shadow:0 2px 8px -3px rgba(20,17,43,.25)}
.stage-view{display:grid}
.stage-view .scene{grid-area:1/1;opacity:0;transform:translateY(10px) scale(.985);transition:opacity .55s ease,transform .55s ease;pointer-events:none}
.stage-view .scene.on{opacity:1;transform:none;pointer-events:auto}
.scene:not(.on) .ink,.scene:not(.on) .hand,.scene:not(.on) .chat{animation:none}
.meet .tiles{position:absolute;inset:46px 0 58px 0;padding:14px;display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:1fr 1fr;gap:10px}
.tile{position:relative;border-radius:12px;background:linear-gradient(150deg,var(--g1),var(--g2));display:grid;place-items:center;overflow:hidden}
.tile .av{width:46px;height:46px;border-radius:50%;background:rgba(255,255,255,.22);color:#fff;font-weight:800;display:grid;place-items:center;font-size:.95rem}
.tile .nm{position:absolute;left:8px;bottom:6px;font-size:.68rem;color:#fff;font-weight:600;background:rgba(0,0,0,.28);padding:1px 6px;border-radius:5px}
.tile .mute-ic{position:absolute;right:7px;top:6px;font-style:normal;font-size:.62rem;color:#fff;background:var(--live);width:16px;height:16px;border-radius:50%;display:grid;place-items:center}
.tile.spk{box-shadow:0 0 0 3px var(--marker)}
.scene.on .tile.spk .av{animation:talk 1.1s ease-in-out infinite}
@keyframes talk{50%{box-shadow:0 0 0 8px rgba(255,176,32,.35)}}
.tile.more{background:var(--mist);color:var(--ink);font-family:var(--display);font-weight:800;font-size:1.5rem;align-content:center;gap:2px}
.tile.more .nm{position:static;background:none;color:var(--mute);font-family:var(--body)}
.meet .ctrl{position:absolute;left:0;right:0;bottom:12px;display:flex;justify-content:center;gap:8px}
.meet .ctrl span{height:36px;min-width:36px;padding:0 10px;border-radius:10px;background:var(--mist);color:var(--ink2);display:grid;place-items:center;font-size:.85rem}
.meet .ctrl span.act{background:var(--vio-l);color:var(--vio)}
.meet .ctrl .end{background:var(--live);color:#fff;font-weight:700;font-size:.8rem}
.meet .chat{top:auto;right:auto;left:-22px;bottom:70px}

/* sections */
section.s{padding:84px 0}
section.s.alt{background:var(--mist)}
section.s.dark{background:var(--ink);color:#fff}
section.s.dark h2,section.s.dark h3{color:#fff}
section.s.dark .lede,section.s.dark p{color:rgba(255,255,255,.78)}
.sec-head{max-width:720px;margin-bottom:44px}
.cols{display:grid;gap:22px}
.c2{grid-template-columns:repeat(2,1fr)}.c3{grid-template-columns:repeat(3,1fr)}.c4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:26px}
.card p{color:var(--ink2);font-size:.97rem;margin:0}
.card h3{margin-bottom:8px}
.alt .card{border-color:transparent}
.ico{width:42px;height:42px;border-radius:11px;background:var(--vio-l);color:var(--vio);display:grid;place-items:center;margin-bottom:16px}
.ico svg{width:22px;height:22px}
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
ul.ticks{list-style:none;padding:0;margin:0 0 1em}
ul.ticks li{padding:6px 0 6px 30px;position:relative}
ul.ticks li:before{content:"";position:absolute;left:2px;top:13px;width:14px;height:8px;border-left:2.5px solid var(--ok);border-bottom:2.5px solid var(--ok);transform:rotate(-45deg)}

/* price anchor — teacher annotation */
.anchor{display:grid;grid-template-columns:auto 1fr;gap:48px;align-items:center}
.big-price{font-family:var(--display);font-weight:800;font-size:clamp(4rem,10vw,7.5rem);line-height:.9;letter-spacing:-.05em;position:relative;display:inline-block}
.big-price small{font-size:.22em;letter-spacing:0;font-weight:600;color:var(--ink2);display:block;margin-top:10px}
.big-price .circle{position:absolute;inset:-18% -12% -8% -10%;pointer-events:none}
.big-price .circle path{fill:none;stroke:var(--marker);stroke-width:5;stroke-linecap:round;stroke-dasharray:1000;stroke-dashoffset:1000}
.in .big-price .circle path{animation:draw 1.3s .2s forwards}
.note-hand{font-family:var(--hand);font-size:1.6rem;color:var(--live);line-height:1.1}

/* tables */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:#fff}
table{border-collapse:collapse;width:100%;font-size:.95rem;min-width:620px}
th,td{text-align:left;padding:13px 16px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-family:var(--mono);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--mute);background:var(--mist);font-weight:600}
tr:last-child td{border-bottom:0}
td.us,th.us{background:var(--vio-l)}
td.num{font-variant-numeric:tabular-nums;white-space:nowrap}
.y{color:var(--ok);font-weight:700}.n{color:var(--mute)}

/* answer block (GEO) */
.answer{border-left:4px solid var(--marker);background:#FFF9EC;padding:18px 22px;border-radius:0 12px 12px 0;margin:0 0 32px;font-size:1.05rem}
.answer b{color:var(--ink)}

/* faq */
.faq details{border-bottom:1px solid var(--line);padding:18px 0}
.faq summary{font-weight:700;font-size:1.08rem;cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary:after{content:"+";font-family:var(--mono);color:var(--vio);font-size:1.3rem;line-height:1}
.faq details[open] summary:after{content:"–"}
.faq details p{margin:12px 0 0;color:var(--ink2)}

/* code */
pre{background:var(--ink);color:#E9E5FF;border-radius:var(--r);padding:20px 22px;overflow-x:auto;font-family:var(--mono);font-size:.84rem;line-height:1.6;margin:0}
pre .c{color:#8F8AB8}pre .s{color:#8CF0DA}pre .k{color:#C9A6FF}
code{font-family:var(--mono);font-size:.88em;background:var(--mist);padding:1px 6px;border-radius:5px}

/* steps (real sequence) */
.steps{counter-reset:st;display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.steps .card{position:relative;padding-top:58px}
.steps .card:before{counter-increment:st;content:counter(st);position:absolute;top:22px;left:26px;font-family:var(--display);font-weight:800;font-size:1.5rem;color:var(--vio)}

/* breadcrumbs + page head */
.crumbs{font-size:.86rem;color:var(--mute);margin-bottom:18px}
.crumbs a{color:var(--mute);text-decoration:none}.crumbs a:hover{color:var(--vio)}
.phead{padding:56px 0 40px;border-bottom:1px solid var(--line)}
.prose{max-width:760px}
.prose h2{margin-top:1.6em;font-size:clamp(1.5rem,2.6vw,2rem)}
.prose h3{margin-top:1.3em}
.prose ul,.prose ol{padding-left:1.3em}.prose li{margin:.35em 0}
.meta-line{font-size:.88rem;color:var(--mute)}

/* cta band */
.cta-band{background:var(--vio);color:#fff;border-radius:22px;padding:52px;display:grid;grid-template-columns:1.4fr auto;gap:32px;align-items:center;position:relative;overflow:hidden}
.cta-band h2{color:#fff;margin:0 0 8px}
.cta-band p{color:rgba(255,255,255,.85);margin:0}
.cta-band .btn{background:#fff;color:var(--vio) !important}
.cta-band .btn:hover{background:var(--marker);color:var(--ink) !important}
.cta-band .btn.ghost-light{background:transparent;color:#fff !important;box-shadow:inset 0 0 0 1.5px rgba(255,255,255,.55)}
.cta-band .btn.ghost-light:hover{background:rgba(255,255,255,.12);color:#fff !important}
.nav > a:not(.btn){display:inline-flex}
.cta-band svg.sq{position:absolute;right:-30px;top:-30px;width:220px;opacity:.18}

/* form */
.form{display:grid;gap:16px}
.form .row2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form label{font-weight:600;font-size:.92rem;display:grid;gap:6px}
.form input,.form select,.form textarea{font:inherit;font-size:1rem;padding:12px 14px;border:1.5px solid var(--line);border-radius:10px;background:#fff;color:var(--ink);width:100%}
.form input:focus,.form select:focus,.form textarea:focus{border-color:var(--vio);outline:none;box-shadow:0 0 0 3px var(--vio-l)}
.form .msg{font-size:.95rem;padding:12px 14px;border-radius:10px;display:none}
.form .msg.ok{display:block;background:#E6F8F4;color:#06614F}
.form .msg.err{display:block;background:#FFECEF;color:#A3123A}
.hp{position:absolute;left:-9999px}

/* footer */
.ftr{background:var(--ink);color:rgba(255,255,255,.72);padding:64px 0 28px;margin-top:90px;font-size:.93rem}
.ftr a{color:rgba(255,255,255,.72);text-decoration:none}.ftr a:hover{color:#fff}
.ftr .cols{grid-template-columns:1.4fr repeat(4,1fr);gap:28px}
.ftr h4{color:#fff;font-size:.82rem;font-family:var(--mono);letter-spacing:.14em;text-transform:uppercase;margin:0 0 14px;font-weight:600}
.ftr ul{list-style:none;padding:0;margin:0;display:grid;gap:8px}
.ftr .logo{color:#fff;margin-bottom:12px}
.ftr .legal{border-top:1px solid rgba(255,255,255,.12);margin-top:44px;padding-top:22px;font-size:.82rem;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}

.reveal{opacity:0;transform:translateY(14px);transition:opacity .6s,transform .6s}
.reveal.in{opacity:1;transform:none}

@media (max-width:980px){
  .hero .grid,.split,.anchor{grid-template-columns:1fr;gap:40px}
  .c3,.c4,.steps{grid-template-columns:1fr 1fr}
  .ftr .cols{grid-template-columns:1fr 1fr}
  .board .chat{right:8px}
}
@media (max-width:760px){
  body{font-size:16px}
  .wrap{padding:0 16px}
  .menu-t{display:inline-flex;margin-left:auto;background:none;border:1.5px solid var(--line);border-radius:10px;padding:8px 12px;font:inherit;font-weight:700;color:var(--ink)}
  .nav{display:none;position:absolute;top:68px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;padding:10px 16px 18px;margin:0}
  .nav.open{display:flex}
  .nav .dd{position:static;box-shadow:none;border:0;padding:0 0 0 12px}
  .hdr .btn.sm.desk{display:none}
  .c2,.c3,.c4,.steps,.form .row2{grid-template-columns:1fr}
  section.s{padding:60px 0}
  .hero{padding:40px 0 36px}
  .hero h1 .hl{white-space:normal}
  .cta-band{grid-template-columns:1fr;padding:34px 24px}
  .board .chat{display:none}
  .ftr .cols{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){
  *,*:before,*:after{animation:none !important;transition:none !important}
  .mark-path,.board .ink,.big-price .circle path{stroke-dashoffset:0}
  .board .hand{opacity:1}
  .reveal{opacity:1;transform:none}
}