:root {
  --bg: #070b14;
  --bg-2: #0c1322;
  --bg-3: #121b2e;
  --navy: #0b1c3a;
  --line: rgba(142, 200, 230, 0.16);
  --text: #f3f6fb;
  --muted: #9aa8bd;
  --sky: #8ec8e6;
  --orange: #e07a3a;
  --orange-2: #f19a5c;
  --ok: #3dd68c;
  --err: #ff6b6b;
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
  --radius: 22px;
  --max: 1160px;
  --font-display: "Syne", system-ui, sans-serif;
  --font-body: "Source Sans 3", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.65;
  overflow-x: hidden;
}

img,
video {
  max-width: 100%;
  display: block;
}

a {
  color: var(--sky);
  text-decoration: none;
}

a:hover {
  color: #c5e7f6;
}

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  background: var(--orange);
  color: #140c08;
  padding: 0.6rem 1rem;
  z-index: 20;
}

.skip:focus {
  top: 1rem;
}

.wrap {
  width: min(calc(100% - 2rem), var(--max));
  margin-inline: auto;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--sky);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 0.72rem;
  font-weight: 700;
}

.eyebrow::before {
  content: "";
  width: 1.5rem;
  height: 2px;
  background: var(--orange);
}

h1,
h2,
h3,
.display {
  font-family: var(--font-display);
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin: 0 0 0.75rem;
}

h1 {
  font-size: clamp(2.6rem, 7vw, 5.4rem);
  font-weight: 800;
}

h2 {
  font-size: clamp(2rem, 4.4vw, 3.2rem);
}

h3 {
  font-size: 1.25rem;
}

.lede {
  color: var(--muted);
  font-size: 1.15rem;
  max-width: 42rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(18px);
  background: rgba(7, 11, 20, 0.72);
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4.4rem;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--text);
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.logo small {
  display: block;
  font-family: var(--font-body);
  color: var(--muted);
  font-weight: 400;
  letter-spacing: 0.12em;
  font-size: 0.62rem;
  text-transform: uppercase;
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.4rem;
}

.nav a {
  color: var(--muted);
  font-size: 0.95rem;
}

.nav a:hover,
.nav a:focus-visible {
  color: var(--text);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border: 0;
  border-radius: 999px;
  padding: 0.85rem 1.3rem;
  font: 700 0.95rem var(--font-body);
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(180deg, var(--orange-2), var(--orange));
  color: #1a0d06;
  box-shadow: 0 10px 30px rgba(224, 122, 58, 0.28);
}

.btn-primary:hover {
  color: #1a0d06;
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
}

.btn-ghost:hover {
  color: var(--text);
  border-color: var(--sky);
}

.menu-toggle {
  display: none;
  width: 2.6rem;
  height: 2.6rem;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  border-radius: 10px;
}

.hero {
  position: relative;
  padding: 4.5rem 0 3.5rem;
  isolation: isolate;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(900px 420px at 80% 10%, rgba(224, 122, 58, 0.16), transparent 55%),
    radial-gradient(700px 360px at 10% 80%, rgba(142, 200, 230, 0.12), transparent 50%),
    linear-gradient(180deg, #0b1424 0%, var(--bg) 70%);
  overflow: hidden;
}

.cubes {
  position: absolute;
  inset: auto -8% -20% 42%;
  width: 70%;
  height: 80%;
  opacity: 0.45;
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 2.5rem;
  align-items: center;
}

.hero h1 span {
  color: var(--sky);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin: 1.6rem 0 1.4rem;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.hero-meta strong {
  color: var(--text);
}

.book-stage {
  position: relative;
  display: grid;
  place-items: center;
}

.book-glow {
  position: absolute;
  width: 70%;
  height: 50%;
  background: radial-gradient(circle, rgba(142, 200, 230, 0.28), transparent 70%);
  filter: blur(10px);
}

.book-stage img {
  position: relative;
  width: min(100%, 420px);
  height: auto;
  aspect-ratio: 1080 / 1350;
  object-fit: contain;
  filter: drop-shadow(0 28px 40px rgba(0, 0, 0, 0.55));
}

.proof {
  border-block: 1px solid var(--line);
  background: rgba(18, 27, 46, 0.55);
  padding: 1.1rem 0;
}

.proof .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1.6rem;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.92rem;
}

.pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.pill {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  color: var(--sky);
  background: rgba(142, 200, 230, 0.06);
}

.section {
  padding: 5.5rem 0;
}

.section-head {
  margin-bottom: 2.2rem;
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.4rem;
  align-items: center;
}

.quote {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1.1;
  margin: 0 0 1rem;
}

.panel {
  background: linear-gradient(180deg, rgba(18, 27, 46, 0.9), rgba(12, 19, 34, 0.9));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.panel img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.flow {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 0.8rem;
  align-items: stretch;
}

.flow-card,
.code-card,
.valid-card {
  background: var(--bg-3);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1.1rem 1.15rem;
}

.flow-card h3,
.code-card h3,
.valid-card h3 {
  margin-bottom: 0.8rem;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.arrow {
  display: grid;
  place-items: center;
  color: var(--sky);
  font-size: 1.6rem;
}

pre,
.code {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.55;
  overflow: auto;
}

.kw { color: #c792ea; }
.cls { color: var(--sky); }
.typ { color: #82d4a8; }
.bool { color: var(--orange-2); }
.str { color: #ecc48d; }
.num { color: #f78c6c; }
.cmt { color: #6d7b8f; }

.bad {
  color: #ffb4a8;
}

.ok {
  color: var(--ok);
}

.grid-3,
.grid-2,
.learn-grid,
.toc,
.audience,
.look {
  display: grid;
  gap: 1rem;
}

.learn-grid {
  grid-template-columns: repeat(3, 1fr);
}

.card {
  background: rgba(18, 27, 46, 0.7);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1.3rem;
}

.card p {
  margin: 0;
  color: var(--muted);
}

.icon {
  width: 2.3rem;
  height: 2.3rem;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: rgba(224, 122, 58, 0.12);
  color: var(--orange-2);
  margin-bottom: 0.9rem;
  font-size: 1.1rem;
}

.toc {
  grid-template-columns: repeat(3, 1fr);
}

.toc-col {
  background:
    linear-gradient(180deg, rgba(224, 122, 58, 0.08), transparent 18%),
    var(--bg-3);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 1.4rem;
}

.toc-col ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.toc-col li {
  display: grid;
  grid-template-columns: 1.8rem 1fr;
  gap: 0.7rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--muted);
}

.toc-col li span {
  color: var(--sky);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding-top: 0.15rem;
}

.logo img {
  border-radius: 10px;
}

.look-stack img {
  max-height: 280px;
  object-fit: cover;
}

.look .cover-desk {
  max-height: 860px;
  object-fit: cover;
  object-position: center top;
}

:focus-visible {
  outline: 2px solid var(--sky);
  outline-offset: 3px;
}

.look {
  grid-template-columns: 1.3fr 0.9fr;
}

.look-stack {
  display: grid;
  gap: 1rem;
}

.look img,
.cover-desk {
  width: 100%;
  border-radius: 20px;
  border: 1px solid var(--line);
  object-fit: cover;
}

.video-wrap {
  position: relative;
  border-radius: 24px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #000;
  box-shadow: var(--shadow);
}

.video-wrap video {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.audience {
  grid-template-columns: repeat(3, 1fr);
}

.author {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 2rem;
  align-items: center;
}

.author-card {
  padding: 0;
}

.author-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 320px;
}

.get {
  background:
    radial-gradient(700px 280px at 20% 0%, rgba(224, 122, 58, 0.18), transparent 60%),
    linear-gradient(180deg, #10192b, #0a1220);
  border-top: 1px solid var(--line);
}

.price-box {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 1.5rem;
  align-items: center;
  padding: 1.8rem;
}

.price {
  display: flex;
  gap: 1.4rem;
  align-items: baseline;
  flex-wrap: wrap;
}

.price b {
  font-size: 2.6rem;
  font-family: var(--font-display);
}

.price span {
  color: var(--muted);
}

.site-footer {
  padding: 2rem 0 3rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.socials {
  display: flex;
  gap: 1rem;
}

@media (max-width: 980px) {
  .hero-grid,
  .split,
  .flow,
  .learn-grid,
  .toc,
  .look,
  .audience,
  .author,
  .price-box {
    grid-template-columns: 1fr;
  }

  .flow {
    gap: 0.7rem;
  }

  .arrow {
    transform: rotate(90deg);
    height: 1.4rem;
  }

  .nav {
    display: none;
    position: absolute;
    inset: 4.4rem 1rem auto;
    background: #10182a;
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 1rem;
    flex-direction: column;
    align-items: flex-start;
  }

  .nav.is-open {
    display: flex;
  }

  .menu-toggle {
    display: grid;
    place-items: center;
  }

  .hero {
    padding-top: 2.2rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .btn,
  .cubes {
    transition: none;
    animation: none;
  }
}