:root{
  --ground:#f6f1e6;
  --surface:#ffffff;
  --surface-2:#f0e9d8;
  --ink:#1c1622;
  --ink-soft:#5a5064;
  --ink-faint:#8a7f96;
  --line:#e0d6c2;
  --line-strong:#cabf9f;
  --yellow:#e8a400;
  --yellow-bright:#ffc21a;
  --purple:#8a3fb0;
  --teal:#1897a3;
  --pink:#dc3f6a;
  --green:#2f9e5c;
  --code-ground:#1a1424;
  --code-ink:#ece6f3;
  --shadow:0 1px 2px rgba(28,22,34,.08),0 8px 30px rgba(28,22,34,.10);
  --shadow-lift:0 2px 6px rgba(28,22,34,.12),0 20px 50px rgba(28,22,34,.16);
  --focus:#8a3fb0;
  color-scheme:light;
}
:root:not([data-theme="light"]){
  @media (prefers-color-scheme: dark){
    --ground:#15111c;
    --surface:#1e1826;
    --surface-2:#251d31;
    --ink:#ece6f3;
    --ink-soft:#b7abc6;
    --ink-faint:#8a7d9c;
    --line:#332a41;
    --line-strong:#463956;
    --yellow:#ffc21a;
    --yellow-bright:#ffd24d;
    --purple:#b06fd6;
    --teal:#43c5d0;
    --pink:#f0658a;
    --green:#4fd18a;
    --code-ground:#0f0b16;
    --code-ink:#ece6f3;
    --shadow:0 1px 2px rgba(0,0,0,.4),0 12px 40px rgba(0,0,0,.5);
    --shadow-lift:0 2px 8px rgba(0,0,0,.5),0 24px 70px rgba(0,0,0,.6);
    --focus:#ffc21a;
    color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --ground:#15111c;
  --surface:#1e1826;
  --surface-2:#251d31;
  --ink:#ece6f3;
  --ink-soft:#b7abc6;
  --ink-faint:#8a7d9c;
  --line:#332a41;
  --line-strong:#463956;
  --yellow:#ffc21a;
  --yellow-bright:#ffd24d;
  --purple:#b06fd6;
  --teal:#43c5d0;
  --pink:#f0658a;
  --green:#4fd18a;
  --code-ground:#0f0b16;
  --code-ink:#ece6f3;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 12px 40px rgba(0,0,0,.5);
  --shadow-lift:0 2px 8px rgba(0,0,0,.5),0 24px 70px rgba(0,0,0,.6);
  --focus:#ffc21a;
  color-scheme:dark;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto}*{animation-duration:.001ms!important;transition-duration:.001ms!important}}
body{
  margin:0;
  background:var(--ground);
  color:var(--ink);
  font-family:"Hanken Grotesk",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  font-size:17px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:inherit}
img{max-width:100%;display:block}
[hidden]{display:none!important}
:focus-visible{outline:3px solid var(--focus);outline-offset:2px;border-radius:3px}

.wrap{width:100%;max-width:1120px;margin-inline:auto;padding-inline:22px}
.mono{font-family:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace}
h1,h2,h3{font-family:"Bricolage Grotesque","Hanken Grotesk",system-ui,sans-serif;line-height:1.02;text-wrap:balance;margin:0;letter-spacing:-.01em}
.eyebrow{font-family:"JetBrains Mono",monospace;font-size:.72rem;letter-spacing:.22em;text-transform:uppercase;color:var(--ink-faint);font-weight:500}

/* ---------- top nav ---------- */
.nav{position:sticky;top:0;z-index:40;background:color-mix(in srgb,var(--ground) 82%,transparent);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav .row{display:flex;align-items:center;gap:18px;height:62px}
.brand{display:flex;align-items:center;gap:10px;font-family:"Bricolage Grotesque",sans-serif;font-weight:800;font-size:1.02rem;letter-spacing:-.02em;text-decoration:none}
.brand .dot{color:var(--yellow)}
.brand img{width:26px;height:34px;border-radius:3px;box-shadow:0 2px 6px rgba(0,0,0,.3)}
.nav .links{margin-left:auto;display:flex;gap:26px}
.nav .links a{text-decoration:none;color:var(--ink-soft);font-weight:500;font-size:.95rem}
.nav .links a:hover{color:var(--ink)}
.nav-cta{text-decoration:none;background:var(--yellow);color:#1c1200;font-weight:700;padding:9px 16px;border-radius:9px;font-size:.92rem;box-shadow:0 2px 0 rgba(0,0,0,.15)}
.nav-cta:hover{background:var(--yellow-bright)}
.themebtn{background:transparent;border:1px solid var(--line-strong);color:var(--ink-soft);width:38px;height:38px;border-radius:9px;cursor:pointer;font-size:1.05rem;display:grid;place-items:center}
.themebtn:hover{color:var(--ink);border-color:var(--ink-faint)}
@media (max-width:820px){.nav .links{display:none}}

/* ---------- hero ---------- */
.hero{position:relative;padding-block:64px 76px;overflow:hidden}
.hero-bg{position:absolute;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.hero-bg .vec{position:absolute;font-family:"JetBrains Mono",monospace;font-size:14px;color:var(--ink);opacity:.05;white-space:nowrap;font-weight:500}
.hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:1.15fr .85fr;gap:52px;align-items:center}
@media (max-width:900px){.hero-grid{grid-template-columns:1fr;gap:40px}}
.hero h1{font-size:clamp(2.7rem,6.4vw,4.7rem);font-weight:800}
.hero h1 .l2{display:block;color:var(--purple);font-size:.5em;font-weight:700;margin-top:.35em;letter-spacing:0}
.hero .kicker{display:inline-flex;align-items:center;gap:9px;border:1px solid var(--line-strong);border-radius:999px;padding:6px 14px;margin-bottom:22px;font-size:.82rem;color:var(--ink-soft);background:var(--surface)}
.hero .kicker b{color:var(--yellow);font-family:"JetBrains Mono",monospace}
.lede{font-size:1.16rem;color:var(--ink-soft);max-width:33em;margin:22px 0 8px}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;align-items:center;margin-top:26px}
.btn{display:inline-flex;align-items:center;gap:9px;text-decoration:none;font-weight:700;border-radius:11px;padding:14px 22px;font-size:1rem;transition:transform .12s ease}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--yellow);color:#1c1200;box-shadow:0 3px 0 rgba(0,0,0,.22),var(--shadow)}
.btn-primary:hover{background:var(--yellow-bright)}
.btn-ghost{border:1px solid var(--line-strong);color:var(--ink);background:var(--surface)}
.btn-ghost:hover{border-color:var(--ink-faint)}
.rating-inline{display:flex;align-items:center;gap:10px;margin-top:22px;font-size:.95rem;color:var(--ink-soft)}
.stars{color:var(--yellow);letter-spacing:2px;font-size:1.05rem}
.rating-inline b{color:var(--ink)}

/* cover */
.cover-stage{position:relative;display:grid;place-items:center}
.cover-glow{position:absolute;width:78%;aspect-ratio:1;border-radius:50%;background:radial-gradient(circle,var(--yellow) 0%,transparent 68%);opacity:.32;filter:blur(20px);z-index:0}
.cover{position:relative;z-index:1;width:min(340px,80%);border-radius:8px;box-shadow:0 30px 70px rgba(0,0,0,.45),0 8px 20px rgba(0,0,0,.3);transform:rotate(-2.2deg);transition:transform .3s ease}
.cover:hover{transform:rotate(0deg) scale(1.02)}
.cover-tag{position:absolute;z-index:2;bottom:12px;right:2px;background:var(--code-ground);color:var(--code-ink);font-family:"JetBrains Mono",monospace;font-size:.72rem;padding:8px 12px;border-radius:9px;box-shadow:var(--shadow-lift);border:1px solid rgba(255,255,255,.08);transform:rotate(3deg)}
.cover-tag b{color:var(--yellow)}

/* ---------- playground ---------- */
.play{background:var(--code-ground);border-radius:20px;padding:26px;box-shadow:var(--shadow-lift);border:1px solid rgba(255,255,255,.07);position:relative}
.play-head{display:flex;align-items:center;gap:8px;margin-bottom:6px}
.play-head .tl{width:12px;height:12px;border-radius:50%;background:#ff5f57}
.play-head .tl:nth-child(2){background:#febc2e}
.play-head .tl:nth-child(3){background:#28c840}
.play-head .title{margin-left:12px;color:#8a7d9c;font-family:"JetBrains Mono",monospace;font-size:.8rem}
.play-sub{color:#b7abc6;font-size:.95rem;margin:14px 2px 18px}
.play-sub b{color:var(--yellow-bright)}
.vec-list{display:flex;flex-direction:column;gap:10px}
.vec-btn{display:flex;align-items:center;gap:14px;width:100%;text-align:left;cursor:pointer;background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.08);border-radius:12px;padding:13px 15px;transition:border-color .15s,background .15s;color:var(--code-ink)}
.vec-btn:hover{border-color:var(--yellow);background:rgba(255,194,26,.07)}
.vec-btn .run{flex:none;width:34px;height:34px;border-radius:8px;background:var(--yellow);color:#1c1200;display:grid;place-items:center;font-size:.9rem}
.vec-btn code{font-family:"JetBrains Mono",monospace;font-size:.86rem;color:#ece6f3;line-height:1.4;word-break:break-word}
.vec-btn .tok-k{color:#f0658a}
.vec-btn .tok-f{color:#ffc21a}
.vec-btn .tok-s{color:#4fd18a}
.vec-btn .tok-n{color:#43c5d0}
.vec-btn .lbl{display:block;color:#8a7d9c;font-size:.72rem;font-family:"JetBrains Mono",monospace;margin-top:5px;letter-spacing:.04em}
.play-foot{margin-top:16px;color:#6f6383;font-size:.78rem;font-family:"JetBrains Mono",monospace;text-align:center}

/* fake alert dialog */
.alert-back{position:fixed;inset:0;z-index:100;background:rgba(10,7,15,.55);backdrop-filter:blur(3px);display:grid;place-items:start center;padding-top:14vh;opacity:0;transition:opacity .16s ease}
.alert-back.show{opacity:1}
.alert-box{width:min(420px,90vw);background:#f4f4f5;color:#18181b;border-radius:13px;box-shadow:0 30px 80px rgba(0,0,0,.5);overflow:hidden;transform:translateY(-10px) scale(.97);transition:transform .18s cubic-bezier(.2,.8,.3,1.4)}
.alert-back.show .alert-box{transform:none}
:root[data-theme="dark"] .alert-box, :root:not([data-theme="light"]) .alert-box{background:#2b2b30;color:#f4f4f5}
.alert-top{padding:20px 22px 16px;display:flex;gap:14px;align-items:flex-start}
.alert-ico{flex:none;width:42px;height:42px;border-radius:50%;background:var(--yellow);color:#1c1200;display:grid;place-items:center;font-family:"Bricolage Grotesque";font-weight:800;font-size:1.4rem}
.alert-host{font-size:.78rem;color:#71717a;font-family:"JetBrains Mono",monospace}
.alert-msg{font-family:"JetBrains Mono",monospace;font-size:1.15rem;font-weight:700;margin-top:3px;word-break:break-word}
.alert-btns{display:flex;justify-content:flex-end;gap:10px;padding:0 18px 18px}
.alert-ok{background:#3b82f6;color:#fff;border:none;border-radius:8px;padding:9px 20px;font-weight:700;font-size:.92rem;cursor:pointer;font-family:inherit}
.alert-ok:hover{background:#2f6fe0}

/* ---------- generic section ---------- */
section{position:relative}
.band{padding-block:74px}
.sec-head{max-width:38em;margin-bottom:40px}
.sec-head h2{font-size:clamp(1.9rem,4vw,2.7rem);font-weight:800}
.sec-head p{color:var(--ink-soft);font-size:1.08rem;margin:14px 0 0}
.sec-head .eyebrow{display:block;margin-bottom:14px}

/* learn grid */
.learn{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
@media (max-width:860px){.cards{grid-template-columns:repeat(2,1fr)}}
@media (max-width:560px){.cards{grid-template-columns:1fr}}
.card{background:var(--ground);border:1px solid var(--line);border-radius:15px;padding:22px;display:flex;flex-direction:column;gap:12px}
.card .num{font-family:"JetBrains Mono",monospace;font-size:.74rem;color:var(--ink-faint);letter-spacing:.1em}
.card h3{font-size:1.24rem;font-weight:700;letter-spacing:-.01em}
.card p{margin:0;color:var(--ink-soft);font-size:.96rem;flex:1}
.card .snip{font-family:"JetBrains Mono",monospace;font-size:.8rem;background:var(--code-ground);color:var(--code-ink);padding:11px 13px;border-radius:9px;overflow-x:auto;border:1px solid rgba(255,255,255,.06)}
.snip .tok-k{color:var(--pink)}.snip .tok-f{color:var(--yellow-bright)}.snip .tok-s{color:var(--green)}.snip .tok-n{color:var(--teal)}.snip .tok-c{color:#6f6383}
.chapter-line{border-top:1px solid var(--line);color:var(--pink)}

/* stats strip */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:44px}
@media (max-width:640px){.stats{grid-template-columns:repeat(2,1fr)}}
.stat{text-align:center;padding:20px 8px;border:1px solid var(--line);border-radius:14px;background:var(--ground)}
.stat .big{font-family:"Bricolage Grotesque";font-weight:800;font-size:2rem;color:var(--yellow);line-height:1;font-variant-numeric:tabular-nums}
.stat .lbl{color:var(--ink-soft);font-size:.86rem;margin-top:8px}

/* reviews */
.reviews-grid{columns:3;column-gap:18px}
@media (max-width:900px){.reviews-grid{columns:2}}
@media (max-width:600px){.reviews-grid{columns:1}}
.review{break-inside:avoid;background:var(--surface);border:1px solid var(--line);border-radius:15px;padding:20px 21px;margin-bottom:18px;box-shadow:var(--shadow)}
.review .rstars{color:var(--yellow);letter-spacing:1px;font-size:.95rem}
.review h3{font-size:1.08rem;font-weight:700;margin:11px 0 8px}
.review p{margin:0;color:var(--ink-soft);font-size:.96rem}
.review .who{display:flex;align-items:center;gap:10px;margin-top:16px;padding-top:14px;border-top:1px solid var(--line)}
.review .av{flex:none;width:34px;height:34px;border-radius:50%;background:var(--surface-2);display:grid;place-items:center;font-weight:700;font-family:"Bricolage Grotesque";color:var(--purple);font-size:.95rem}
.review .who .n{font-weight:600;font-size:.9rem}
.review .who .m{font-size:.76rem;color:var(--ink-faint);font-family:"JetBrains Mono",monospace}

/* author */
.author{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.author-grid{display:grid;grid-template-columns:.9fr 1.4fr;gap:44px;align-items:center}
@media (max-width:820px){.author-grid{grid-template-columns:1fr;gap:30px}}
.author-card{background:var(--code-ground);border-radius:18px;padding:30px;color:var(--code-ink);border:1px solid rgba(255,255,255,.07)}
.author-card .h{font-family:"Bricolage Grotesque";font-weight:800;font-size:1.5rem}
.author-card .role{color:var(--yellow-bright);font-family:"JetBrains Mono",monospace;font-size:.82rem;margin-top:4px}
.author-card ul{list-style:none;padding:0;margin:20px 0 0;display:flex;flex-direction:column;gap:11px}
.author-card li{position:relative;padding-left:20px;font-size:.92rem;color:#c9bed6}
.author-card li::before{content:"›";position:absolute;left:0;top:0;color:var(--yellow);font-weight:700}
.author-card a{color:var(--yellow-bright);text-decoration:none;border-bottom:1px solid rgba(255,210,77,.4)}
.author-card a:hover{border-bottom-color:var(--yellow-bright)}
.author h2{font-size:clamp(1.8rem,4vw,2.5rem);font-weight:800}
.author-title{margin-top:14px}
.author p{color:var(--ink-soft);font-size:1.06rem}

/* buy */
.buy-layout{display:grid;grid-template-columns:.72fr 1.28fr;gap:44px;align-items:start}
@media (max-width:840px){.buy-layout{grid-template-columns:1fr;gap:34px}}
.buy-cover{position:relative;display:grid;place-items:center;padding-top:6px}
.buy-cover .glow{position:absolute;width:80%;aspect-ratio:1;border-radius:50%;background:radial-gradient(circle,var(--yellow) 0%,transparent 68%);opacity:.22;filter:blur(22px)}
.buy-cover img{position:relative;width:min(300px,78%);border-radius:8px;box-shadow:var(--shadow-lift);transform:rotate(-2deg)}
.buy-cover .cap{position:relative;margin-top:20px;text-align:center;color:var(--ink-soft);font-size:.9rem}
.buy-cover .cap b{display:block;font-family:"Bricolage Grotesque";font-weight:800;color:var(--ink);font-size:1.15rem;letter-spacing:-.01em}
.buy-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
@media (max-width:520px){.buy-grid{grid-template-columns:1fr}}
.store{display:flex;flex-direction:column;gap:6px;text-decoration:none;background:var(--surface);border:1px solid var(--line);border-radius:15px;padding:20px 20px 18px;transition:transform .14s ease,border-color .14s;position:relative}
.store:hover{transform:translateY(-3px);border-color:var(--yellow)}
.store .badge{position:absolute;top:14px;right:14px;font-size:.66rem;font-family:"JetBrains Mono",monospace;letter-spacing:.08em;text-transform:uppercase;padding:3px 8px;border-radius:6px;background:var(--surface-2);color:var(--ink-soft)}
.store .badge.hot{background:var(--yellow);color:#1c1200}
.store .st-name{font-family:"Bricolage Grotesque";font-weight:700;font-size:1.2rem}
.store .st-meta{color:var(--ink-soft);font-size:.9rem}
.store.deal{border-color:var(--yellow);box-shadow:var(--shadow)}
.store .st-price{display:flex;align-items:baseline;gap:8px;margin-top:4px;font-family:"JetBrains Mono",monospace}
.store .st-price b{font-family:"Bricolage Grotesque",sans-serif;font-weight:800;font-size:1.6rem;color:var(--yellow);letter-spacing:-.02em;line-height:1}
.store .st-price small{font-size:.74rem;color:var(--ink-faint)}
.store .st-go{margin-top:8px;color:var(--purple);font-weight:700;font-size:.9rem;font-family:"JetBrains Mono",monospace}
.buy-note{margin-top:22px;color:var(--ink-faint);font-size:.9rem;text-align:center}

/* promo band */
.promo{background:var(--code-ground);color:var(--code-ink)}
.promo-grid{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center}
@media (max-width:820px){.promo-grid{grid-template-columns:1fr;gap:28px}}
.promo h2{color:#fff;font-size:clamp(1.8rem,4vw,2.5rem)}
.promo p{color:#b7abc6;font-size:1.06rem}
.promo .eyebrow{color:var(--yellow-bright)}
.promo .hl{color:var(--yellow-bright)}
.promo-cta{margin-top:8px}
.promo img{border-radius:14px;box-shadow:0 20px 60px rgba(0,0,0,.5);border:1px solid rgba(255,255,255,.08)}

/* footer */
footer{padding-block:44px;border-top:1px solid var(--line)}
.foot-row{display:flex;flex-wrap:wrap;gap:18px;align-items:center;justify-content:space-between}
.foot-row .c{color:var(--ink-faint);font-size:.86rem}
.foot-links{display:flex;gap:20px;flex-wrap:wrap}
.foot-links a{color:var(--ink-soft);text-decoration:none;font-size:.9rem}
.foot-links a:hover{color:var(--ink)}