/* My BitLab — site styles. Brand: Lab Ink / Paper / Bit Orange, Readex Pro + Martian Mono. */
:root{
  --ink:#0F1223;--ink-2:#151932;--ink-3:#1B2036;--paper:#F5F2EA;--paper-2:#FFFDF8;--bit:#FF5A1F;--bit-d:#E84B12;
  --graphite:#2B2F42;--slate:#5E6379;--mist:#B9BBC6;--grid:#E6E1D5;--line:#DDD7CA;
  --blue:#3B5BFF;--yellow:#FFC21F;--green:#12B886;--violet:#8C5CFF;
  --font:'Readex Pro',system-ui,sans-serif;--mono:'Martian Mono','Readex Pro',ui-monospace,monospace;
  --r:6px;--wrap:1240px;--ease:cubic-bezier(.2,.7,.2,1);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--paper);line-height:1.6;font-size:17px;overflow-x:hidden}
[dir=rtl] body{line-height:1.75}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
h1,h2,h3,p,ul,ol,dl{margin:0}
ul,ol{padding:0;list-style:none}
.wrap{width:min(var(--wrap),100% - 40px);margin-inline:auto}
.mono{font-family:var(--mono);font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;font-weight:500}
[dir=rtl] .mono{letter-spacing:.03em}
.skip{position:absolute;inset-inline-start:12px;top:-60px;background:var(--bit);color:var(--ink);padding:10px 14px;z-index:99;border-radius:var(--r)}
.skip:focus{top:12px}
.ink{background:var(--ink);color:var(--paper)}
.ink h2,.ink h1{color:#fff}
.grid-bg{background-image:linear-gradient(#181C30 1px,transparent 1px),linear-gradient(90deg,#181C30 1px,transparent 1px);background-size:40px 40px}
.bit-bg{background:var(--bit);color:var(--ink)}
.ic{width:1.1em;height:1.1em;flex:none}
.ic-arrow{transition:transform .35s var(--ease)}
[dir=rtl] .ic-arrow{transform:scaleX(-1)}

/* ---------- type ---------- */
h1{font-size:clamp(46px,7vw,96px);font-weight:600;letter-spacing:-.035em;line-height:1}
[dir=rtl] h1{letter-spacing:0;line-height:1.2}
h2{font-size:clamp(34px,4.4vw,60px);font-weight:600;letter-spacing:-.03em;line-height:1.08}
[dir=rtl] h2{letter-spacing:0;line-height:1.3}
h2 .thin{font-weight:400;color:var(--slate)}
.ink h2 .thin{color:var(--mist)}
.h3{font-size:clamp(24px,2.6vw,34px);line-height:1.3;letter-spacing:-.015em}
[dir=rtl] .h3{letter-spacing:0;line-height:1.55}
.eyebrow{display:flex;align-items:center;gap:12px;font-family:var(--mono);font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:var(--bit);font-weight:600;margin-bottom:18px}
[dir=rtl] .eyebrow{letter-spacing:.03em;font-size:.84rem}
.eyebrow::before{content:"";width:12px;height:12px;background:var(--bit);flex:none}
.eyebrow.dark{color:var(--ink)}.eyebrow.dark::before{background:var(--ink)}
.sec-lead{font-size:clamp(17px,1.35vw,20px);color:var(--graphite);max-width:720px;margin-top:20px}
.ink .sec-lead{color:#C9CBD6}
.bit-bg .sec-lead{color:var(--ink)}
.sec{padding:clamp(80px,10vw,140px) 0;position:relative}
.sec-head{max-width:860px;margin-bottom:clamp(40px,5vw,70px)}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:12px;padding:16px 26px;border-radius:var(--r);font-weight:600;font-size:1rem;border:1.5px solid transparent;cursor:pointer;transition:transform .35s var(--ease),background .25s,color .25s,border-color .25s;white-space:nowrap}
.btn:hover{transform:translateY(-2px)}
.btn:hover .ic-arrow{transform:translateX(4px)}
[dir=rtl] .btn:hover .ic-arrow{transform:scaleX(-1) translateX(4px)}
.btn-bit{background:var(--bit);color:var(--ink)}
.btn-bit:hover{background:#FF6E3A}
.btn-ink{background:var(--ink);color:var(--paper)}
.btn-ink:hover{background:var(--ink-2)}
.btn-ghost{border-color:#3A3F5C;color:var(--paper)}
.btn-ghost:hover{border-color:var(--paper)}
.btn-sm{padding:10px 18px;font-size:.92rem}
.btn.full{width:100%;justify-content:center}
.tag{display:inline-flex;align-items:center;gap:10px;font-family:var(--mono);font-size:.74rem;letter-spacing:.12em;text-transform:uppercase;padding:8px 14px;border-radius:3px;font-weight:600;margin-bottom:22px}
[dir=rtl] .tag{letter-spacing:.03em;font-size:.8rem}
.tag-yellow{background:var(--yellow);color:var(--ink)}
.tag-soon{background:transparent;border:1px solid var(--line);color:var(--slate)}
.tag .bitsq{width:9px;height:9px;background:currentColor}

/* ---------- nav ---------- */
.nav{position:fixed;inset-inline:0;top:0;z-index:50;transition:background .3s,box-shadow .3s,padding .3s;padding:14px 0;color:var(--paper)}
.nav.solid{background:rgba(15,18,35,.86);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);box-shadow:0 1px 0 rgba(255,255,255,.06);padding:8px 0}
.nav-in{display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{color:var(--paper)}.brand .lockup{font-size:28px}
.lockup{display:inline-flex;align-items:center;gap:.4em;line-height:1;font-size:30px;direction:ltr;unicode-bidi:isolate;color:inherit}
.lockup .lk-sym{height:1.25em;width:auto}
.wm{font-family:var(--font);font-weight:700;letter-spacing:-.025em;white-space:nowrap;position:relative;top:.02em}
.wm-i{position:relative;display:inline-block}
.wm-i i{position:absolute;left:50%;top:.08em;width:.18em;height:.18em;background:var(--bit);transform:translateX(-50%)}
.lockup.stack{flex-direction:column;align-items:flex-start;gap:.32em;font-size:40px}
.lockup.stack .lk-sym{height:1.6em}
.lk-tag{font-family:var(--mono);font-size:.3em;letter-spacing:.28em;text-transform:uppercase;font-weight:500;color:#C9CBD6;display:inline-flex;align-items:center;gap:.35em}
.lk-tag i{width:.6em;height:.6em;background:var(--bit);display:inline-block}
.menu{display:flex;gap:28px;align-items:center;font-size:.95rem;font-weight:500}
.menu a{opacity:.85;transition:opacity .2s,color .2s;position:relative}
.menu a:hover{opacity:1}
.menu a::after{content:"";position:absolute;inset-inline:0;bottom:-6px;height:2px;background:var(--bit);transform:scaleX(0);transition:transform .3s var(--ease);transform-origin:center}
.menu a:hover::after{transform:scaleX(1)}
.menu .lang{font-family:var(--mono);font-size:.78rem;border:1px solid #3A3F5C;padding:5px 10px;border-radius:3px;letter-spacing:.08em}
.menu .lang::after{display:none}
.nav-right{display:flex;align-items:center;gap:18px}
.bits-progress{display:flex;align-items:center;gap:3px}
.bits-progress i{width:9px;height:9px;background:#2A2F48;display:block;transition:background .25s}
.bits-progress i.on{background:var(--bit)}
.bits-progress .mono{margin-inline-start:8px;color:#7E8399;font-size:.68rem;letter-spacing:.12em}
.burger{display:none;width:44px;height:44px;border:0;background:transparent;position:relative;cursor:pointer}
.burger span{position:absolute;left:11px;right:11px;height:2px;background:var(--paper);transition:transform .3s var(--ease),top .3s}
.burger span:first-child{top:17px}.burger span:last-child{top:26px}
.burger[aria-expanded=true] span:first-child{top:21px;transform:rotate(45deg)}
.burger[aria-expanded=true] span:last-child{top:21px;transform:rotate(-45deg)}

/* ---------- hero ---------- */
.hero{min-height:100svh;display:flex;flex-direction:column;justify-content:center;padding:140px 0 60px;position:relative;overflow:hidden}
.hero-in{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center}
.hero .eyebrow{color:var(--bit)}
.hero h1{margin-bottom:22px}
.lead{font-size:clamp(22px,2.3vw,32px);font-weight:600;letter-spacing:-.02em;color:#fff;line-height:1.25}
[dir=rtl] .lead{letter-spacing:0;line-height:1.5}
.sub{font-size:clamp(17px,1.3vw,20px);color:#C9CBD6;max-width:600px;margin-top:20px}
.cta-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:36px}
.stats{display:flex;gap:clamp(22px,3vw,44px);margin-top:48px;padding-top:28px;border-top:1px solid #262B45;flex-wrap:wrap}
.stats li{display:flex;flex-direction:column;gap:2px}
.stats b{font-size:clamp(26px,2.4vw,36px);letter-spacing:0;text-transform:none;font-weight:600;color:#fff;line-height:1}
.stats span{font-size:.85rem;color:#7E8399}
.hero-art{position:relative;aspect-ratio:1;max-width:560px;width:100%;justify-self:center}
.hero-art canvas{position:absolute;inset:0;width:100%;height:100%}
.hero-logo{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity 1s var(--ease)}
.hero-logo.show{opacity:1}
.hero-logo svg{height:72%;width:auto;color:var(--paper)}
.bitpath{transform-box:fill-box;transform-origin:center}
.hero-logo.show .bitpath{animation:bitpulse 1.6s var(--ease) 1}
@keyframes bitpulse{0%{transform:scale(1)}30%{transform:scale(1.35)}100%{transform:scale(1)}}
.hero-foot{display:flex;justify-content:space-between;margin-top:auto;padding-top:60px;color:#7E8399}
.hero-foot .mono{font-size:.7rem}

/* ---------- reveal ---------- */
.rv{opacity:0;transform:translateY(26px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.rv.in{opacity:1;transform:none}
.rv.d1{transition-delay:.1s}.rv.d2{transition-delay:.2s}.rv.d3{transition-delay:.3s}.rv.d4{transition-delay:.4s}.rv.d5{transition-delay:.55s}
[data-stagger]>*{opacity:0;transform:translateY(22px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
[data-stagger].in>*{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .rv,[data-stagger]>*{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}

/* ---------- pillars ---------- */
.pillars{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.pillar{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:30px 28px 32px;position:relative;transition:transform .5s var(--ease),box-shadow .5s var(--ease)}
.pillar:hover{transform:translateY(-6px);box-shadow:0 30px 50px -30px rgba(15,18,35,.35)}
.pillar-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:26px}
.pillar-top .mono{color:var(--bit)}
.bits{display:inline-flex;gap:4px}
.bits i{width:10px;height:10px;background:var(--grid);display:block}
.bits i.on{background:var(--bit)}
.pillar h3{font-size:30px;font-weight:600;letter-spacing:-.02em;margin-bottom:8px}
[dir=rtl] .pillar h3{letter-spacing:0}
.pillar p{color:var(--graphite);font-size:1rem}

/* ---------- pilot ---------- */
.pilot{background:var(--paper-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.pilot-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(40px,6vw,100px);align-items:start}
.facts{display:grid;grid-template-columns:1fr 1fr;gap:0 30px;margin:36px 0 38px;border-top:1px solid var(--line)}
.facts div{display:flex;flex-direction:column;gap:2px;padding:14px 0;border-bottom:1px solid var(--line)}
.facts dt{font-family:var(--mono);font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--slate)}
.facts dd{margin:0;font-weight:600;font-size:1.05rem}
.sessions{display:flex;flex-direction:column;gap:14px;counter-reset:s}
.session{display:grid;grid-template-columns:64px 1fr;gap:20px;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:26px 28px;position:relative;overflow:hidden;transition:transform .5s var(--ease),border-color .3s}
.session::before{content:"";position:absolute;inset-inline-start:0;top:0;bottom:0;width:4px;background:var(--yellow);transform:scaleY(0);transition:transform .6s var(--ease);transform-origin:top}
.session.in::before,.session:hover::before{transform:scaleY(1)}
.session:hover{transform:translateX(4px)}
[dir=rtl] .session:hover{transform:translateX(-4px)}
.session .n{font-family:var(--mono);font-size:1.4rem;font-weight:600;color:var(--bit);line-height:1}
.session h3{font-size:22px;font-weight:600;margin-bottom:4px}
.session p{color:var(--graphite);font-size:1rem}
.draft-note{margin-top:34px;color:var(--slate);font-size:.7rem;text-align:center}

/* ---------- demo ---------- */
.demo-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(30px,4vw,60px);align-items:stretch}
.board{background:var(--ink-2);border:1px solid #232843;border-radius:var(--r);padding:30px;display:flex;flex-direction:column;gap:18px;background-image:linear-gradient(#1B2036 1px,transparent 1px),linear-gradient(90deg,#1B2036 1px,transparent 1px);background-size:28px 28px}
.tl{width:100%;height:auto;max-height:380px;direction:ltr}
.svgmono{font-family:var(--mono);font-size:12px;letter-spacing:2px}
.wire{stroke-width:4;stroke-linecap:square;stroke:#3A3F5C;transition:stroke .3s}
.wire.on.w-red{stroke:#FF4D4D}.wire.on.w-yel{stroke:var(--yellow)}.wire.on.w-grn{stroke:var(--green)}
.led{transition:fill .25s,filter .25s}
#ledR.on{fill:#FF4D4D;filter:drop-shadow(0 0 14px #FF4D4D)}
#ledY.on{fill:var(--yellow);filter:drop-shadow(0 0 14px var(--yellow))}
#ledG.on{fill:var(--green);filter:drop-shadow(0 0 14px var(--green))}
.pwr{opacity:.35;transition:opacity .3s}.running .pwr{opacity:1}
.demo-ctl{display:flex;align-items:center;gap:18px;margin-top:auto}
.demo-state{color:#7E8399;font-size:.72rem}
.code{margin:0;background:#0B0D18;border:1px solid #232843;border-radius:var(--r);padding:28px 30px;font-family:var(--mono);font-size:clamp(12.5px,1.05vw,15px);line-height:1.9;color:#C9CBD6;overflow:auto;text-align:left}
.code .ln{display:block;padding:0 10px;margin:0 -10px;border-radius:3px;transition:background .25s,color .25s;white-space:pre}
.code .ln.hl{background:#1E2340;color:#fff}
.code .ln.hl::before{content:"▶";position:absolute;margin-left:-20px;color:var(--bit);font-size:.75em;line-height:2.4}
.code .c{color:#5E6379}
.code .kw{color:var(--violet);font-style:normal}
.code .num{color:var(--bit);font-style:normal}
.demo-note{margin-top:30px;color:#7E8399;text-align:center}

/* ---------- steps ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:2px solid var(--ink)}
.step{padding:32px 28px 36px 0;border-inline-end:1px solid var(--line);position:relative}
[dir=rtl] .step{padding:32px 0 36px 28px}
.step:last-child{border-inline-end:0}
.step+.step{padding-inline-start:28px}
.step .n{font-family:var(--mono);font-size:.78rem;color:var(--bit);font-weight:600;letter-spacing:.12em;display:flex;align-items:center;gap:10px;margin-bottom:20px}
.step .n::after{content:"";height:1px;background:var(--line);flex:1}
.step h3{font-size:24px;font-weight:600;margin-bottom:8px}
.step p{color:var(--graphite);font-size:1rem}
.levels{margin-top:clamp(40px,5vw,70px);display:grid;grid-template-columns:120px 1fr;gap:20px 40px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:30px 34px}
.levels>.mono{color:var(--slate)}
.levels-row{display:flex;gap:clamp(18px,3vw,40px);flex-wrap:wrap}
.lvl{display:flex;flex-direction:column;gap:8px}
.lvl b{font-size:.95rem;font-weight:600}
.lvl .bits i{width:12px;height:12px}
.levels-note{grid-column:1/-1;color:var(--slate);font-size:.95rem;border-top:1px solid var(--line);padding-top:16px}

/* ---------- tracks ---------- */
.tracks-sec{background:var(--paper-2);border-top:1px solid var(--line)}
.tracks{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.track{border-radius:var(--r);overflow:hidden;border:1px solid var(--line);background:#fff;display:flex;flex-direction:column;transition:transform .5s var(--ease),box-shadow .5s var(--ease)}
.track:hover{transform:translateY(-6px);box-shadow:0 30px 50px -30px rgba(15,18,35,.35)}
.track-top{padding:26px 26px 22px;display:flex;justify-content:space-between;align-items:flex-start;min-height:150px;position:relative;overflow:hidden}
.track-top .icn{width:52px;height:52px}
.track-top .status{font-family:var(--mono);font-size:.66rem;letter-spacing:.12em;text-transform:uppercase;padding:6px 10px;border-radius:3px;background:rgba(15,18,35,.14);font-weight:600}
.track.soon .track-top{filter:saturate(.75)}
.track.soon .track-top .status{background:rgba(255,255,255,.22)}
.track-body{padding:22px 26px 28px;display:flex;flex-direction:column;gap:8px;flex:1}
.track-body h3{font-size:22px;font-weight:600;line-height:1.25}
.track-body p{color:var(--graphite);font-size:.98rem}
.track-body .mono{margin-top:auto;padding-top:14px;color:var(--slate);font-size:.66rem}

/* ---------- parents ---------- */
.parents-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(40px,6vw,100px);align-items:center}
.commit{display:flex;flex-direction:column;gap:0;margin-top:40px;border-top:1px solid #262B45}
.commit-item{display:grid;grid-template-columns:48px 1fr;gap:18px;padding:22px 0;border-bottom:1px solid #262B45}
.commit-item .icn{width:40px;height:40px;color:var(--paper)}
.commit-item b{display:block;font-size:1.1rem;font-weight:600;color:#fff}
.commit-item span{color:#C9CBD6;font-size:.98rem}
.chat-wrap{justify-self:center;width:100%;max-width:440px}
.chat{background:#EFEAE0;border-radius:22px;overflow:hidden;color:var(--ink);box-shadow:0 50px 90px -50px rgba(0,0,0,.7)}
.chat-head{background:var(--ink-2);color:#fff;padding:16px 20px;display:flex;align-items:center;gap:14px}
.chat-av{width:46px;height:46px;border-radius:50%;background:var(--bit);display:flex;align-items:center;justify-content:center}
.chat-av svg{height:24px;width:auto;color:var(--ink)}
.chat-head b{display:block;font-size:1rem}.chat-head small{opacity:.7;font-size:.78rem}
.chat-body{padding:18px 16px 22px;display:flex;flex-direction:column;gap:12px;min-height:300px}
.msg{background:#fff;border-radius:14px;padding:14px 16px;font-size:.98rem;line-height:1.65;max-width:88%;opacity:0;transform:translateY(12px) scale(.98);transition:opacity .5s var(--ease),transform .5s var(--ease);align-self:flex-start}
[dir=rtl] .msg{align-self:flex-start}
.msg.me{background:#D9FDD3;align-self:flex-end}
.msg.show{opacity:1;transform:none}
.msg .lvl-row{display:flex;align-items:center;gap:10px;margin-top:10px;font-size:.85rem}
.msg .lvl-row b{font-family:var(--mono);font-size:.72rem;letter-spacing:.08em}
.illus{margin-top:14px;text-align:center;color:#7E8399;font-size:.68rem}
.typing{display:inline-flex;gap:4px;padding:6px 2px}
.typing i{width:7px;height:7px;border-radius:50%;background:var(--mist);animation:blink 1.2s infinite}
.typing i:nth-child(2){animation-delay:.2s}.typing i:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,80%,100%{opacity:.3}40%{opacity:1}}

/* ---------- founders ---------- */
.founders{padding:clamp(60px,7vw,90px) 0;border-top:1px solid var(--line)}
.founders-in{display:grid;grid-template-columns:1.2fr .8fr;gap:clamp(30px,5vw,80px);align-items:center}
.founders-list{display:flex;flex-direction:column;gap:14px}
.founder{display:flex;align-items:center;gap:18px;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:18px 22px}
.founder .av{width:54px;height:54px;border-radius:50%;background:var(--ink);color:var(--paper);display:flex;align-items:center;justify-content:center;font-weight:600;font-size:1.2rem;flex:none;position:relative}
.founder .av::after{content:"";position:absolute;width:9px;height:9px;background:var(--bit);top:2px;inset-inline-end:2px}
.founder b{display:block;font-size:1.1rem;font-weight:600}
.founder span{color:var(--slate);font-size:.92rem}

/* ---------- faq ---------- */
.faq-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:clamp(30px,5vw,80px);align-items:start}
.faq-grid .sec-head{margin-bottom:0;position:sticky;top:110px}
.faq{border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:20px;padding:22px 0;font-size:1.15rem;font-weight:600}
.faq summary::-webkit-details-marker{display:none}
.faq summary .pm{width:28px;height:28px;flex:none;position:relative}
.faq summary .pm::before,.faq summary .pm::after{content:"";position:absolute;background:var(--bit);left:50%;top:50%;transform:translate(-50%,-50%)}
.faq summary .pm::before{width:14px;height:2px}.faq summary .pm::after{width:2px;height:14px;transition:transform .3s var(--ease)}
.faq details[open] summary .pm::after{transform:translate(-50%,-50%) rotate(90deg)}
.faq .ans{padding:0 0 24px;color:var(--graphite);max-width:640px}

/* ---------- book ---------- */
.book-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(40px,6vw,100px);align-items:center}
.book h2{color:var(--ink)}
.wa-direct{display:inline-flex;align-items:center;gap:12px;margin-top:34px;font-weight:600;font-size:1.15rem;border-bottom:2px solid var(--ink);padding-bottom:4px}
.wa-direct .ic{width:1.3em;height:1.3em}
.form{background:var(--paper-2);border-radius:var(--r);padding:clamp(24px,3vw,40px);display:grid;grid-template-columns:1fr 1fr;gap:18px;color:var(--ink);box-shadow:0 50px 90px -50px rgba(15,18,35,.5)}
.form label{display:flex;flex-direction:column;gap:8px}
.form label span{font-family:var(--mono);font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--slate)}
.form input,.form select,.form textarea{border:1.5px solid var(--line);border-radius:4px;padding:13px 14px;background:#fff;outline:0;transition:border-color .2s;width:100%}
.form input:focus,.form select:focus,.form textarea:focus{border-color:var(--ink)}
.form .full{grid-column:1/-1}
.form .invalid{border-color:var(--bit)}
.form-note{grid-column:1/-1;font-size:.85rem;color:var(--slate);text-align:center}

/* ---------- footer ---------- */
.foot{background:var(--ink);color:var(--paper);padding:60px 0 40px}
.foot-in{display:grid;grid-template-columns:1fr auto;gap:30px 60px;align-items:start}
.foot-brand .lockup{color:var(--paper)}
.foot-brand p{margin-top:18px;color:#C9CBD6;font-size:1.05rem}
.foot-links{display:flex;gap:22px;flex-wrap:wrap;font-size:.95rem}
.foot-links a{opacity:.8}.foot-links a:hover{opacity:1}
.foot-meta{grid-column:1/-1;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;border-top:1px solid #262B45;padding-top:22px;color:#7E8399;font-size:.68rem}
.wa-float{position:fixed;inset-inline-end:22px;bottom:22px;width:58px;height:58px;border-radius:50%;background:#25D366;color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 14px 30px -10px rgba(0,0,0,.45);z-index:40;transition:transform .35s var(--ease)}
.wa-float:hover{transform:scale(1.08)}
.wa-float .ic{width:28px;height:28px}

/* ---------- responsive ---------- */
@media (max-width:1100px){
  .pillars,.tracks,.steps{grid-template-columns:repeat(2,1fr)}
  .steps{border-top:0;gap:22px}
  .step,.step+.step{padding:26px;border:1px solid var(--line);border-radius:var(--r);background:#fff}
  .menu{gap:20px}
  .bits-progress{display:none}
}
@media (max-width:900px){
  .hero{padding-top:120px}
  .hero-in{grid-template-columns:1fr}
  .hero-art{max-width:380px;order:-1;margin-inline:auto}
  .pilot-grid,.demo-grid,.parents-grid,.founders-in,.faq-grid,.book-grid{grid-template-columns:1fr}
  .faq-grid .sec-head{position:static;margin-bottom:30px}
  .levels{grid-template-columns:1fr}
  .menu{position:fixed;inset:0;top:0;background:var(--ink);flex-direction:column;justify-content:center;align-items:center;gap:28px;font-size:1.4rem;transform:translateY(-100%);transition:transform .45s var(--ease);z-index:-1;opacity:0}
  .menu.open{transform:none;opacity:1;z-index:1}
  .nav.open{background:var(--ink)}
  .burger{display:block}
  .nav .btn{display:none}
  .foot-in{grid-template-columns:1fr}
}
@media (max-width:600px){
  body{font-size:16px}
  .wrap{width:min(var(--wrap),100% - 32px)}
  .pillars,.tracks,.steps,.facts,.form{grid-template-columns:1fr}
  .stats{gap:18px 28px}
  .session{grid-template-columns:44px 1fr;padding:20px}
  .hero-art{max-width:300px}
  .hero{padding-top:104px}
  .hero .eyebrow{font-size:.7rem;letter-spacing:.02em}
  [dir=rtl] .hero .eyebrow{font-size:.78rem}
  .code{padding:20px 18px 20px 30px}
  .wa-float{width:52px;height:52px;inset-inline-end:16px;bottom:16px}
  .brand .lockup{font-size:24px}
  .lockup.stack{font-size:34px}
}

[dir=rtl] .facts dt,[dir=rtl] .form label span,[dir=rtl] .step .n,[dir=rtl] .status,[dir=rtl] .draft-note,[dir=rtl] .illus,[dir=rtl] .demo-state,[dir=rtl] .chat-head small{letter-spacing:.02em;font-weight:600}