:root{color-scheme:dark;--bg:#070b15;--ink:#f4f7ff;--muted:#aebbd1;--cyan:#64f0f4;--purple:#bb9aff;--line:#273348;--panel:#101a2a;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-synthesis:none}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:25px}body{margin:0;background:var(--bg);color:var(--ink);font-size:18px;line-height:1.65}a{color:var(--cyan);text-underline-offset:5px}a:hover{color:white}button,a{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--cyan);outline-offset:5px}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.1;letter-spacing:-.045em}h1{font-size:clamp(43px,6.8vw,83px);max-width:12ch;margin-bottom:24px;font-weight:820}h2{font-size:clamp(30px,4vw,46px);margin-bottom:24px;max-width:21ch}h3{font-size:25px;letter-spacing:-.025em;margin-bottom:12px}p{margin-bottom:22px}.wrap{width:min(1120px,calc(100% - 48px));margin-inline:auto}.skip{position:absolute;left:16px;top:-80px;background:var(--ink);color:var(--bg);padding:12px;z-index:20}.skip:focus{top:16px}.header{display:flex;align-items:center;justify-content:space-between;gap:24px;padding-block:24px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none;font-weight:850;letter-spacing:.18em;font-size:20px}.brand img{width:40px;height:40px;border-radius:10px}.nav{display:flex;gap:24px;flex-wrap:wrap;font-size:14px;font-weight:650}.nav a{color:var(--muted);text-decoration:none}.nav a[aria-current=page],.nav a:hover{color:var(--cyan)}.hero{display:grid;grid-template-columns:1.15fr .85fr;gap:58px;align-items:center;padding-block:82px 72px}.hero>*{min-width:0}.eyebrow{color:var(--cyan);text-transform:uppercase;font-weight:760;font-size:13px;letter-spacing:.18em;margin-bottom:20px}.accent{color:var(--cyan)}.lead{font-size:21px;line-height:1.6;color:var(--muted);max-width:50ch}.cta{display:inline-flex;justify-content:center;align-items:center;gap:14px;border-radius:12px;background:var(--cyan);color:#061018;text-decoration:none;font-weight:780;line-height:1.3;padding:18px 24px;min-height:58px}.cta:hover{background:#b1ffff;color:#061018}.cta .arrow{font-size:23px}.fine{color:var(--muted);font-size:13px;margin:14px 0 0}.hero-note{font-size:14px;margin:23px 0 0;color:var(--muted)}.board-figure{margin:0;position:relative}.board-frame{padding:24px;background:linear-gradient(135deg,#16253a,#0e1424);border:1px solid #344866;border-radius:25px;box-shadow:0 24px 80px #0005}.board-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:19px;font-size:11px;font-weight:750;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}.board-top span:last-child{color:var(--cyan)}.board{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:7px;margin:0;padding:0;list-style:none}.tile{aspect-ratio:1;display:grid;place-items:center;border-radius:9px;background:#21304a;border:1px solid #3c4d68;font-size:clamp(17px,2.5vw,26px);font-weight:750;position:relative;line-height:1;transition:background .15s,color .15s}.tile.selected{background:var(--cyan);color:#071522;border-color:#baffff;box-shadow:0 0 16px #64f0f425}.tile.selected:after{content:attr(data-step);position:absolute;top:3px;right:4px;font-size:9px;opacity:.7}.board-controls{display:flex;gap:8px;justify-content:center;margin-top:21px}.word-btn{font:inherit;font-size:12px;font-weight:750;letter-spacing:.06em;border:1px solid #53627a;background:transparent;color:var(--muted);padding:10px 13px;border-radius:7px;cursor:pointer;min-height:42px}.word-btn[aria-pressed=true]{color:var(--cyan);border-color:var(--cyan);background:#1a3a45}.board-caption{font-size:13px;color:var(--muted);margin-top:18px;text-align:center;line-height:1.55;min-height:42px}.board-caption strong{color:var(--ink)}.caption-label{display:block;color:var(--muted);font-size:11px;letter-spacing:.06em;text-transform:uppercase;margin-top:9px}.strip{border-block:1px solid var(--line);display:flex;gap:25px;justify-content:space-between;padding-block:25px;font-size:14px;color:var(--muted)}.strip strong{color:var(--ink);display:block;font-size:20px;letter-spacing:-.02em}.section{padding-block:70px;border-bottom:1px solid var(--line)}.section-head{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:start;margin-bottom:24px}.section-head p{color:var(--muted);margin-top:3px}.columns{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}.columns p,.article p,.article li{color:var(--muted)}.columns .number{color:var(--purple);font-size:14px;font-weight:700;margin-bottom:18px}.text-link{font-size:15px;font-weight:700}.mode{display:grid;grid-template-columns:1fr 1.3fr auto;gap:32px;padding-block:32px;align-items:center;border-top:1px solid var(--line)}.mode h3{margin:0}.mode p{margin:0;color:var(--muted);font-size:16px}.mode .text-link{white-space:nowrap}.article{max-width:790px}.article h2{margin-top:45px}.article h2:first-child{margin-top:0}.article ul,.article ol{padding-left:25px}.article li{padding-left:5px;margin-bottom:15px}.article strong{color:var(--ink)}.callout{border-left:3px solid var(--purple);padding:5px 0 5px 22px;margin-block:30px;font-size:18px;color:var(--ink)}.timer-panel{display:flex;flex-direction:column;justify-content:center;text-align:center;aspect-ratio:1.06;border:1px solid #3a365c;border-radius:25px;background:radial-gradient(ellipse at center,#2b204d,#111828 68%);padding:30px}.timer{font-size:clamp(88px,12vw,145px);line-height:1;font-weight:820;letter-spacing:-.07em;color:var(--purple);font-variant-numeric:tabular-nums}.timer-label{color:var(--muted);font-size:14px;margin-top:21px}.timer-tags{display:flex;flex-wrap:wrap;justify-content:center;gap:15px;font-size:12px;margin-top:32px;color:#ddd2f3}.challenge-note{background:linear-gradient(145deg,#14293a,#19182f);border-radius:24px;padding:38px;border:1px solid #355066}.challenge-note p{font-size:clamp(32px,3.8vw,45px);font-weight:790;line-height:1.15;letter-spacing:-.035em;margin-bottom:24px}.challenge-note .small{font-size:14px;color:var(--muted);font-weight:450;letter-spacing:0;line-height:1.6;margin:0}.challenge-word{color:var(--cyan)}.faq{max-width:790px}details{border-top:1px solid var(--line);padding-block:20px}summary{cursor:pointer;font-size:18px;font-weight:650;padding-right:20px}details p{margin:14px 0 0;color:var(--muted);font-size:16px}.close-cta{display:flex;justify-content:space-between;gap:40px;align-items:center;padding-block:66px}.close-cta h2{margin-bottom:12px;max-width:20ch}.close-cta p{color:var(--muted);margin:0;font-size:16px}.footer{border-top:1px solid var(--line);padding-block:25px 40px;color:var(--muted);font-size:12px;display:flex;justify-content:space-between;gap:22px}.footer a{color:var(--muted)}.footer p{margin:0}.breadcrumb{font-size:13px;color:var(--muted);margin-top:25px}.breadcrumb a{color:var(--muted)}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}
@media(max-width:800px){.hero{gap:32px;grid-template-columns:1fr 1fr;padding-block:58px}.header{gap:20px}.nav{gap:16px}h1{font-size:52px}.lead{font-size:18px}.board-frame{padding:17px}.section-head{gap:35px}.columns{gap:23px}.mode{grid-template-columns:1fr 1.4fr}.mode .text-link{grid-column:2}.challenge-note{padding:25px}.word-btn{padding-inline:9px}}
@media(max-width:620px){.wrap{width:calc(100% - 36px)}.header{align-items:flex-start;flex-direction:column;gap:19px;padding-block:20px}.brand img{width:35px;height:35px}.brand{font-size:18px}.nav{justify-content:space-between;width:100%;gap:10px;font-size:13px}.hero{grid-template-columns:1fr;gap:38px;padding-block:40px 36px}h1{font-size:clamp(43px,11vw,58px);max-width:13ch;margin-bottom:20px}.lead{font-size:18px}.cta{font-size:16px;min-height:55px;width:100%}.hero .fine{text-align:center}.hero-note{margin-top:19px;font-size:13px}.board-figure{max-width:440px;width:100%;margin-inline:auto}.board-frame{padding:21px}.tile{font-size:23px}.board-caption{font-size:12px}.strip{gap:16px;flex-wrap:wrap;padding-block:20px}.strip strong{font-size:17px}.strip div{font-size:12px;min-width:80px}.section{padding-block:44px}.section-head{grid-template-columns:1fr;gap:0;margin-bottom:15px}.section-head h2{margin-bottom:18px}.columns{grid-template-columns:1fr;gap:30px}.columns h3{font-size:23px}.columns p{font-size:16px}.columns .number{margin-bottom:9px}.mode{grid-template-columns:1fr;gap:13px;padding-block:25px}.mode .text-link{grid-column:1}.mode h3{font-size:25px}.article p,.article li{font-size:16px}.article h2{margin-top:35px}.timer-panel{max-width:440px;width:100%;margin-inline:auto;aspect-ratio:1.4}.timer{font-size:clamp(88px,27vw,110px)}.timer-tags{margin-top:20px}.challenge-note{padding:30px}.challenge-note p{font-size:38px}.close-cta{flex-direction:column;align-items:stretch;gap:26px;padding-block:44px}.close-cta h2{font-size:34px}.footer{flex-direction:column;gap:12px;font-size:12px}summary{font-size:17px}.callout{font-size:17px}h2{font-size:34px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}