:root {
  --ink: #0a0b0d;
  --ink-soft: #1a1d22;
  --paper: #f5f2e9;
  --paper-2: #eae6da;
  --white: #fffefa;
  --blue: #1f63ff;
  --blue-dark: #1247c9;
  --signal: #ff4c35;
  --muted: #686b71;
  --line: rgba(10, 11, 13, .16);
  --line-dark: rgba(255, 255, 255, .17);
  --max: 1200px;
  --radius: 22px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .28;
  background-image: linear-gradient(rgba(10,11,13,.035) 1px, transparent 1px), linear-gradient(90deg, rgba(10,11,13,.035) 1px, transparent 1px);
  background-size: 32px 32px;
  z-index: -1;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
::selection { background: var(--blue); color: white; }
.shell { width: min(var(--max), calc(100% - 48px)); margin-inline: auto; }
.skip-link { position: fixed; top: 10px; left: 10px; z-index: 99; transform: translateY(-150%); padding: 10px 14px; background: var(--ink); color: white; border-radius: 8px; }
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  padding: 14px 0;
  background: rgba(245, 242, 233, .92);
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s ease, background .25s ease;
}
.site-header.scrolled { border-color: var(--line); background: rgba(245, 242, 233, .97); background: color-mix(in srgb, var(--paper) 96%, transparent); }
.nav { min-height: 50px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 11px; text-decoration: none; font-weight: 900; letter-spacing: -.035em; }
.brand-mark { width: 35px; height: 35px; display: grid; place-items: center; color: white; background: var(--ink); border-radius: 9px; font-size: .76rem; letter-spacing: -.03em; transform: rotate(-3deg); }
.brand-name { font-size: .93rem; }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links > a:not(.button) { color: #303238; text-decoration: none; font-size: .9rem; font-weight: 720; }
.nav-links > a:not(.button):hover { color: var(--blue); }
.menu-toggle { display: none; border: 1px solid var(--line); background: transparent; border-radius: 999px; padding: 9px 14px; font: inherit; font-weight: 800; color: var(--ink); }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 50px;
  padding: 13px 21px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  background: var(--ink);
  color: white;
  text-decoration: none;
  font-weight: 850;
  letter-spacing: -.01em;
  transition: transform .2s ease, background .2s ease, border-color .2s ease;
}
.button:hover { transform: translateY(-2px); background: var(--blue); border-color: var(--blue); }
.button:focus-visible, .text-link:focus-visible, .nav a:focus-visible, .menu-toggle:focus-visible { outline: 3px solid var(--signal); outline-offset: 3px; }
.button-small { min-height: 42px; padding: 9px 16px; font-size: .87rem; }
.button-blue { background: var(--blue); border-color: var(--blue); }
.button-blue:hover { background: var(--white); border-color: var(--white); color: var(--ink); }
.button-ghost { background: transparent; color: var(--ink); }
.button-ghost:hover { color: white; }
.arrow { font-size: 1.1em; transition: transform .2s ease; }
.button:hover .arrow, .text-link:hover .arrow { transform: translateX(4px); }

.hero { padding: 58px 0 86px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.18fr) minmax(340px, .82fr); gap: clamp(42px, 7vw, 94px); align-items: center; }
.kicker { display: inline-flex; align-items: center; gap: 11px; margin: 0 0 26px; color: var(--blue-dark); font-size: .78rem; line-height: 1; font-weight: 900; letter-spacing: .12em; text-transform: uppercase; }
.kicker::before { content: ""; width: 34px; height: 3px; background: var(--blue); }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 28px; font-size: clamp(4rem, 8.2vw, 7.7rem); line-height: .86; letter-spacing: -.083em; font-weight: 950; }
h1 span, h1 em { display: block; }
h1 em { color: var(--blue); font-style: normal; }
.hero-copy { max-width: 690px; margin-bottom: 30px; font-size: clamp(1.08rem, 1.7vw, 1.32rem); line-height: 1.58; color: #3e4148; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.micro-proof { display: flex; flex-wrap: wrap; gap: 12px 24px; margin-top: 34px; color: var(--muted); font-size: .82rem; font-weight: 760; }
.micro-proof span { display: inline-flex; gap: 8px; align-items: center; }
.micro-proof span::before { content: "+"; width: 18px; height: 18px; display: grid; place-items: center; background: var(--ink); color: white; border-radius: 50%; font-size: .7rem; }
.portrait-stage { position: relative; padding: 28px 0 0 28px; }
.portrait-stage::before { content: ""; position: absolute; inset: 0 28px 28px 0; border: 2px solid var(--ink); border-radius: var(--radius); transform: rotate(-2.5deg); }
.portrait-card { position: relative; overflow: hidden; min-height: 560px; border-radius: var(--radius); background: var(--ink); box-shadow: 22px 22px 0 var(--blue); }
.portrait-card img { width: 100%; height: 100%; min-height: 560px; object-fit: cover; object-position: 50% 43%; filter: saturate(.78) contrast(1.08); }
.portrait-card::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 52%, rgba(4,6,10,.83)); }
.portrait-label { position: absolute; z-index: 2; left: 25px; right: 25px; bottom: 23px; display: flex; justify-content: space-between; align-items: end; gap: 18px; color: white; }
.portrait-label strong { display: block; font-size: 1.18rem; }
.portrait-label span { display: block; color: rgba(255,255,255,.72); font-size: .77rem; text-transform: uppercase; letter-spacing: .09em; }
.portrait-label b { color: var(--signal); font-size: 2rem; line-height: 1; }
.coordinate { position: absolute; z-index: 3; padding: 8px 11px; background: var(--signal); color: white; font-size: .69rem; font-weight: 900; letter-spacing: .1em; text-transform: uppercase; }
.coordinate.top { top: 12px; right: -12px; transform: rotate(3deg); }

.proof-rail { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.proof-grid { display: grid; grid-template-columns: 1.1fr repeat(3, 1fr); }
.proof-item { min-height: 148px; padding: 28px; display: flex; flex-direction: column; justify-content: space-between; border-left: 1px solid var(--line); }
.proof-item:first-child { border-left: 0; padding-left: 0; }
.proof-item small { color: var(--muted); font-size: .7rem; font-weight: 850; letter-spacing: .1em; text-transform: uppercase; }
.proof-item strong { font-size: clamp(1.35rem, 2.5vw, 2.15rem); line-height: 1.05; letter-spacing: -.045em; }
.proof-intro { justify-content: center; }
.proof-intro strong { max-width: 230px; font-size: 1rem; line-height: 1.4; letter-spacing: -.02em; }

.manifesto { padding: 140px 0; }
.section-index { display: flex; align-items: center; gap: 12px; margin-bottom: 40px; color: var(--muted); font-size: .72rem; font-weight: 900; letter-spacing: .12em; text-transform: uppercase; }
.section-index::after { content: ""; width: 72px; height: 1px; background: currentColor; }
.manifesto-grid { display: grid; grid-template-columns: .34fr 1fr; gap: 68px; align-items: start; }
.manifesto-note { position: sticky; top: 108px; color: var(--blue); font-size: .78rem; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; }
.manifesto h2 { max-width: 950px; margin-bottom: 42px; font-size: clamp(2.8rem, 6.2vw, 6.4rem); line-height: .96; letter-spacing: -.07em; }
.manifesto h2 em { color: var(--blue); font-style: normal; }
.manifesto-text { display: grid; grid-template-columns: 1fr 1fr; gap: 34px; border-top: 1px solid var(--line); padding-top: 28px; }
.manifesto-text p { color: #41444a; font-size: 1.02rem; }

.method { position: relative; overflow: hidden; padding: 126px 0; color: white; background: var(--ink); }
.method::after { content: "03"; position: absolute; right: -35px; bottom: -140px; color: rgba(255,255,255,.035); font-weight: 950; font-size: min(38vw, 530px); line-height: 1; letter-spacing: -.12em; pointer-events: none; }
.method .section-index { color: #969aa3; }
.section-heading { display: grid; grid-template-columns: 1fr .62fr; gap: 64px; align-items: end; margin-bottom: 66px; }
.section-heading h2 { margin: 0; font-size: clamp(3rem, 6vw, 6rem); line-height: .94; letter-spacing: -.065em; }
.section-heading p { margin: 0 0 7px; color: #b9bdc7; font-size: 1.08rem; }
.systems { position: relative; z-index: 2; display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--line-dark); }
.system { min-height: 440px; padding: clamp(26px, 4vw, 42px); border-left: 1px solid var(--line-dark); transition: background .25s ease, transform .25s ease; }
.system:first-child { border-left: 0; }
.system:hover, .system.visible:hover { background: var(--blue); transform: translateY(-7px); }
.system-number { display: flex; justify-content: space-between; align-items: center; margin-bottom: 96px; color: #888d98; font-size: .78rem; font-weight: 850; letter-spacing: .1em; }
.system:hover .system-number { color: rgba(255,255,255,.7); }
.system-icon { width: 42px; height: 42px; border: 1px solid currentColor; border-radius: 50%; display: grid; place-items: center; font-size: 1.2rem; }
.system h3 { margin-bottom: 18px; font-size: clamp(1.85rem, 3vw, 2.7rem); line-height: 1; letter-spacing: -.05em; }
.system p { margin-bottom: 30px; color: #afb3bd; }
.system:hover p { color: rgba(255,255,255,.82); }
.system ul { margin: 0; padding: 0; list-style: none; color: #d8dbe2; font-size: .84rem; font-weight: 750; }
.system li { padding: 8px 0; border-top: 1px solid var(--line-dark); }
.method-line { margin: 60px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); align-items: center; color: #9da1ac; font-size: .75rem; font-weight: 850; text-transform: uppercase; letter-spacing: .1em; }
.method-line span:nth-child(2) { text-align: center; }
.method-line span:nth-child(3) { text-align: right; }

.offers { padding: 140px 0 120px; }
.offers .section-heading { margin-bottom: 48px; }
.offers .section-heading p { color: var(--muted); }
.offer-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 18px; }
.offer { position: relative; min-height: 430px; padding: 34px; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); display: flex; flex-direction: column; background: rgba(255,255,255,.44); }
.offer:nth-child(1) { grid-column: span 5; background: var(--blue); color: white; border-color: var(--blue); }
.offer:nth-child(2) { grid-column: span 3; }
.offer:nth-child(3) { grid-column: span 4; background: var(--ink); color: white; border-color: var(--ink); }
.offer-code { display: flex; align-items: center; justify-content: space-between; margin-bottom: 58px; font-size: .7rem; font-weight: 900; letter-spacing: .11em; text-transform: uppercase; opacity: .68; }
.offer-code span:last-child { width: 10px; height: 10px; border-radius: 50%; background: currentColor; }
.offer h3 { max-width: 340px; margin-bottom: 16px; font-size: clamp(2rem, 3vw, 3.3rem); line-height: .96; letter-spacing: -.06em; }
.offer p { margin-bottom: 28px; color: inherit; opacity: .73; }
.offer .text-link { margin-top: auto; align-self: flex-start; }
.text-link { display: inline-flex; align-items: center; gap: 10px; color: inherit; font-weight: 900; text-decoration: none; border-bottom: 2px solid currentColor; padding-bottom: 4px; }
.offer:nth-child(1)::after { content: "400"; position: absolute; right: -18px; bottom: -34px; color: rgba(255,255,255,.12); font-size: 10rem; line-height: 1; font-weight: 950; letter-spacing: -.1em; pointer-events: none; }
.offer:nth-child(3)::after { content: "S"; position: absolute; right: -15px; bottom: -50px; color: rgba(255,255,255,.07); font-family: Georgia, serif; font-size: 15rem; line-height: 1; pointer-events: none; }
.offer > * { position: relative; z-index: 2; }

.process { padding: 0 0 140px; }
.process-card { display: grid; grid-template-columns: .73fr 1.27fr; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--white); }
.process-lead { padding: clamp(34px, 5vw, 62px); background: var(--signal); color: white; }
.process-lead .section-index { color: white; opacity: .74; }
.process-lead h2 { margin-bottom: 24px; font-size: clamp(2.55rem, 5vw, 4.7rem); line-height: .95; letter-spacing: -.065em; }
.process-lead p { color: rgba(255,255,255,.82); }
.process-steps { padding: 18px clamp(28px, 5vw, 60px); }
.step { display: grid; grid-template-columns: 58px 1fr; gap: 24px; padding: 36px 0; border-top: 1px solid var(--line); }
.step:first-child { border-top: 0; }
.step-number { width: 42px; height: 42px; display: grid; place-items: center; border: 1px solid var(--ink); border-radius: 50%; font-size: .78rem; font-weight: 900; }
.step h3 { margin-bottom: 7px; font-size: 1.25rem; letter-spacing: -.025em; }
.step p { margin: 0; color: var(--muted); font-size: .95rem; }

.about { padding: 126px 0; background: var(--paper-2); }
.about-grid { display: grid; grid-template-columns: .6fr 1.4fr; gap: clamp(42px, 9vw, 120px); }
.about-stamp { align-self: start; padding: 28px; border: 1px solid var(--line); border-radius: 50%; aspect-ratio: 1; display: grid; place-items: center; text-align: center; transform: rotate(-5deg); }
.about-stamp span { max-width: 140px; font-size: .78rem; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; }
.about-copy h2 { margin-bottom: 30px; font-size: clamp(3.1rem, 6vw, 6.4rem); line-height: .92; letter-spacing: -.075em; }
.about-copy h2 em { color: var(--blue); font-style: normal; }
.about-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 34px; }
.about-columns p { color: #3f4249; }
.about-facts { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 12px; margin-top: 8px; }
.about-facts span { padding: 9px 13px; border: 1px solid var(--line); border-radius: 999px; font-size: .76rem; font-weight: 820; }

.cta { position: relative; overflow: hidden; padding: 132px 0; background: var(--blue); color: white; }
.cta::before { content: ""; position: absolute; width: 580px; height: 580px; border: 1px solid rgba(255,255,255,.24); border-radius: 50%; right: -180px; top: -300px; box-shadow: 0 0 0 80px rgba(255,255,255,.035), 0 0 0 160px rgba(255,255,255,.025); }
.cta-grid { position: relative; display: grid; grid-template-columns: 1fr .38fr; gap: 70px; align-items: end; }
.cta h2 { max-width: 900px; margin-bottom: 28px; font-size: clamp(3.4rem, 7.6vw, 7.7rem); line-height: .88; letter-spacing: -.075em; }
.cta p { max-width: 650px; margin-bottom: 0; color: rgba(255,255,255,.8); font-size: 1.12rem; }
.cta-action { text-align: right; }
.cta-action .button { background: white; border-color: white; color: var(--ink); }
.cta-action .button:hover { background: var(--ink); border-color: var(--ink); color: white; }
.cta-action small { display: block; margin-top: 14px; color: rgba(255,255,255,.68); font-size: .76rem; }

/* 400 empresas */
.book-page { --book-orange: #ff8a18; }
.book-page .nav-links a[aria-current="page"] { color: var(--blue); }
.book-hero { position: relative; overflow: hidden; padding: 66px 0 100px; color: white; background: var(--ink); }
.book-hero::after { content: "400"; position: absolute; right: -4vw; bottom: -13vw; color: rgba(255,255,255,.025); font-size: min(39vw, 560px); line-height: 1; font-weight: 950; letter-spacing: -.11em; pointer-events: none; }
.book-hero-grid { position: relative; z-index: 2; display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(360px, .72fr); gap: clamp(54px, 8vw, 110px); align-items: center; }
.book-kicker { display: inline-flex; align-items: center; gap: 12px; margin-bottom: 27px; color: var(--book-orange); font-size: .76rem; font-weight: 900; letter-spacing: .12em; text-transform: uppercase; }
.book-kicker::before { content: ""; width: 34px; height: 3px; background: currentColor; }
.book-title { margin-bottom: 18px; font-size: clamp(5.1rem, 10.5vw, 10.2rem); line-height: .75; letter-spacing: -.085em; text-transform: uppercase; }
.book-title span, .book-title em { display: block; }
.book-title em { color: var(--book-orange); font-size: .46em; line-height: 1.08; letter-spacing: -.06em; }
.book-subtitle { max-width: 710px; margin-bottom: 19px; color: white; font-size: clamp(1.25rem, 2.2vw, 1.78rem); line-height: 1.25; font-weight: 820; letter-spacing: -.035em; }
.book-intro { max-width: 680px; margin-bottom: 31px; color: #b9bdc7; font-size: 1.06rem; }
.book-buy-row { display: flex; align-items: center; flex-wrap: wrap; gap: 22px; }
.book-button { background: var(--book-orange); border-color: var(--book-orange); color: var(--ink); }
.book-button:hover { background: white; border-color: white; color: var(--ink); }
.book-price { display: flex; flex-direction: column; padding-left: 22px; border-left: 1px solid var(--line-dark); }
.book-price small { color: #8e939d; font-size: .69rem; font-weight: 850; letter-spacing: .1em; text-transform: uppercase; }
.book-price strong { font-size: 1.58rem; line-height: 1.1; letter-spacing: -.04em; }
.book-price strong span { color: #8e939d; font-size: .7rem; letter-spacing: .06em; }
.book-meta { display: flex; flex-wrap: wrap; gap: 11px; margin-top: 32px; }
.book-meta span { padding: 8px 11px; border: 1px solid var(--line-dark); border-radius: 999px; color: #c8cbd2; font-size: .72rem; font-weight: 790; }
.book-cover-stage { position: relative; width: min(100%, 520px); min-width: 0; justify-self: end; padding: 34px 24px 38px 0; }
.book-cover-stage::before { content: ""; position: absolute; inset: 0 0 12px 42px; border: 1px solid rgba(255,255,255,.32); border-radius: var(--radius); }
.book-cover-frame { position: relative; z-index: 2; width: 100%; aspect-ratio: 1; overflow: hidden; border-radius: var(--radius); background: #e8e3da; box-shadow: 18px 18px 0 var(--blue), -13px -13px 0 var(--book-orange); }
.book-cover-frame img { width: 100%; height: 100%; object-fit: contain; object-position: center; }
.book-edition { position: absolute; z-index: 3; top: 9px; right: 0; padding: 8px 11px; background: var(--book-orange); color: var(--ink); font-size: .67rem; font-weight: 950; letter-spacing: .1em; text-transform: uppercase; }
.book-caption { position: absolute; z-index: 3; left: -31px; bottom: 11px; padding: 9px 12px; background: white; color: var(--ink); font-size: .68rem; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; }
.book-rail { border-bottom: 1px solid var(--line); background: var(--book-orange); }
.book-rail-grid { min-height: 130px; display: grid; grid-template-columns: .72fr 1.28fr; gap: 50px; align-items: center; }
.book-rail p, .book-rail strong { margin: 0; }
.book-rail p { max-width: 330px; color: rgba(10,11,13,.68); font-size: .78rem; font-weight: 850; letter-spacing: .08em; text-transform: uppercase; }
.book-rail strong { font-size: clamp(1.45rem, 3vw, 2.65rem); line-height: 1.04; letter-spacing: -.045em; }
.book-premise { padding: 136px 0; }
.book-premise-grid { display: grid; grid-template-columns: .34fr 1fr; gap: 68px; align-items: start; }
.book-side-note { max-width: 220px; color: var(--blue); font-size: .8rem; font-weight: 900; letter-spacing: .07em; text-transform: uppercase; }
.book-premise h2 { max-width: 950px; margin-bottom: 44px; font-size: clamp(3rem, 6.4vw, 6.5rem); line-height: .94; letter-spacing: -.07em; }
.book-premise h2 em { color: var(--book-orange); font-style: normal; }
.book-premise-copy { display: grid; grid-template-columns: 1fr 1fr; gap: 34px; padding-top: 28px; border-top: 1px solid var(--line); }
.book-premise-copy p { color: #41444a; font-size: 1.03rem; }
.book-systems { position: relative; overflow: hidden; padding: 128px 0; color: white; background: var(--blue); }
.book-systems::after { content: "03"; position: absolute; right: -30px; bottom: -135px; color: rgba(255,255,255,.045); font-size: min(37vw, 510px); line-height: 1; font-weight: 950; letter-spacing: -.12em; }
.book-systems .section-index { color: rgba(255,255,255,.66); }
.book-section-heading { position: relative; z-index: 2; display: grid; grid-template-columns: 1fr .52fr; gap: 70px; align-items: end; margin-bottom: 62px; }
.book-section-heading h2 { margin: 0; font-size: clamp(3rem, 6.1vw, 6.1rem); line-height: .92; letter-spacing: -.068em; }
.book-section-heading p { margin: 0 0 7px; color: rgba(255,255,255,.75); font-size: 1.08rem; }
.book-system-grid { position: relative; z-index: 2; display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid rgba(255,255,255,.28); }
.book-system-card { min-height: 380px; padding: clamp(28px, 4vw, 42px); border-left: 1px solid rgba(255,255,255,.28); display: flex; flex-direction: column; transition: background .25s ease, transform .25s ease; }
.book-system-card:first-child { border-left: 0; }
.book-system-card:hover { background: var(--ink); transform: translateY(-7px); }
.book-system-card > span { color: rgba(255,255,255,.63); font-size: .72rem; font-weight: 900; letter-spacing: .1em; text-transform: uppercase; }
.book-system-card h3 { margin: auto 0 18px; font-size: clamp(2.1rem, 3.7vw, 3.55rem); line-height: .95; letter-spacing: -.06em; }
.book-system-card p { margin: 0; color: rgba(255,255,255,.76); }
.book-reader { padding: 132px 0; background: var(--paper-2); }
.book-reader-grid { display: grid; grid-template-columns: .88fr 1.12fr; gap: clamp(50px, 9vw, 130px); }
.book-reader-lead h2 { max-width: 640px; margin: 0; font-size: clamp(3rem, 6vw, 6rem); line-height: .93; letter-spacing: -.07em; }
.book-reader-list { border-top: 1px solid var(--line); }
.book-reader-list > div { display: grid; grid-template-columns: 55px 1fr; gap: 18px; padding: 27px 0; border-bottom: 1px solid var(--line); }
.book-reader-list span { width: 38px; height: 38px; display: grid; place-items: center; border: 1px solid var(--ink); border-radius: 50%; font-size: .73rem; font-weight: 900; }
.book-reader-list p { margin: 4px 0 0; color: #3f4249; font-size: 1.02rem; }
.book-author { padding: 120px 0; }
.book-author-grid { display: grid; grid-template-columns: .34fr 1fr; gap: clamp(50px, 9vw, 120px); align-items: start; }
.book-author-mark { width: min(250px, 100%); aspect-ratio: 1; display: grid; place-items: center; border-radius: 50%; background: var(--ink); color: var(--book-orange); font-size: clamp(3.4rem, 7vw, 6.5rem); font-weight: 950; letter-spacing: -.09em; transform: rotate(-5deg); }
.book-author h2 { margin-bottom: 30px; font-size: clamp(3rem, 6vw, 6.2rem); line-height: .92; letter-spacing: -.075em; }
.book-author-copy { display: grid; grid-template-columns: 1fr 1fr; gap: 34px; padding-top: 28px; border-top: 1px solid var(--line); }
.book-author-copy p { color: #41444a; }
.book-purchase { position: relative; overflow: hidden; padding: 130px 0; color: white; background: var(--ink); }
.book-purchase::before { content: ""; position: absolute; width: 620px; height: 620px; top: -330px; left: -210px; border: 1px solid rgba(255,255,255,.17); border-radius: 50%; box-shadow: 0 0 0 90px rgba(255,138,24,.035), 0 0 0 180px rgba(31,99,255,.04); }
.book-purchase .shell { position: relative; }
.book-purchase-intro { display: grid; grid-template-columns: 1fr .72fr; gap: clamp(40px, 8vw, 110px); align-items: end; margin-bottom: 54px; }
.book-purchase .section-index { color: #8f949e; }
.book-purchase h2 { max-width: 760px; margin-bottom: 0; font-size: clamp(3.6rem, 7.5vw, 7.6rem); line-height: .86; letter-spacing: -.075em; }
.book-purchase-intro > p { max-width: 560px; margin: 0 0 5px; color: #b5bac4; font-size: 1.06rem; }
.book-editions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.book-edition-card { display: flex; flex-direction: column; min-height: 520px; padding: clamp(29px, 4vw, 44px); border: 1px solid rgba(255,255,255,.2); border-radius: var(--radius); background: #15171b; color: white; }
.book-edition-print { border-color: var(--book-orange); background: var(--book-orange); color: var(--ink); box-shadow: 14px 14px 0 var(--blue); }
.book-edition-topline { display: flex; justify-content: space-between; gap: 18px; align-items: flex-start; margin-bottom: 30px; }
.book-order-label { display: block; margin-bottom: 28px; font-size: .7rem; font-weight: 950; letter-spacing: .12em; text-transform: uppercase; }
.book-edition-topline .book-order-label { margin-bottom: 0; }
.book-edition-tag { padding: 6px 9px; border: 1px solid currentColor; border-radius: 999px; font-size: .65rem; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; white-space: nowrap; }
.book-order-price { margin-bottom: 18px; font-size: clamp(3.7rem, 7vw, 6.5rem); line-height: .82; font-weight: 950; letter-spacing: -.075em; }
.book-order-price small { font-size: .8rem; letter-spacing: .07em; }
.book-edition-card > p { min-height: 58px; margin-bottom: 24px; color: #b5bac4; }
.book-edition-print > p { color: rgba(10,11,13,.72); }
.book-edition-benefits { display: grid; gap: 12px; margin: 0 0 32px; padding: 24px 0 0; border-top: 1px solid rgba(255,255,255,.18); list-style: none; }
.book-edition-benefits li { position: relative; padding-left: 23px; color: #d1d4db; font-size: .9rem; }
.book-edition-benefits li::before { content: "✓"; position: absolute; left: 0; color: var(--book-orange); font-weight: 950; }
.book-edition-print .book-edition-benefits { border-top-color: rgba(10,11,13,.22); }
.book-edition-print .book-edition-benefits li { color: rgba(10,11,13,.76); }
.book-edition-print .book-edition-benefits li::before { color: var(--ink); }
.book-order-button { width: 100%; margin-top: auto; background: white; color: var(--ink); }
.book-order-button:hover { background: var(--blue); border-color: var(--blue); color: white; }
.book-edition-print .book-order-button { background: var(--ink); color: white; }
.book-checkout-note { margin: 28px 0 0; color: #8f949e; font-size: .78rem; }

footer { padding: 44px 0 30px; color: #c9ccd3; background: var(--ink); }
.footer-top { display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: start; padding-bottom: 44px; border-bottom: 1px solid var(--line-dark); }
.footer-brand { max-width: 430px; }
.footer-brand strong { display: block; margin-bottom: 11px; color: white; font-size: 1.3rem; letter-spacing: -.03em; }
.footer-brand p { margin-bottom: 0; color: #9297a1; font-size: .9rem; }
.footer-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 12px 22px; }
.footer-links a { color: white; text-decoration: none; font-size: .85rem; font-weight: 780; }
.footer-links a:hover { color: #76a0ff; }
.footer-bottom { display: flex; justify-content: space-between; gap: 24px; padding-top: 26px; color: #777c86; font-size: .75rem; }

[data-reveal] { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
[data-reveal].visible { opacity: 1; transform: none; }

@media (max-width: 980px) {
  .nav-links { position: absolute; left: 24px; right: 24px; top: calc(100% + 4px); display: none; padding: 20px; align-items: stretch; flex-direction: column; gap: 6px; background: var(--white); border: 1px solid var(--line); border-radius: 16px; box-shadow: 0 20px 55px rgba(10,11,13,.13); }
  .nav-links.open { display: flex; }
  .nav-links > a:not(.button) { padding: 10px 5px; }
  .menu-toggle { display: inline-flex; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-copy { max-width: 780px; }
  .portrait-stage { width: min(620px, 90%); margin-left: auto; }
  .proof-grid { grid-template-columns: 1fr 1fr; }
  .proof-item:nth-child(3) { border-left: 0; }
  .proof-item { border-top: 1px solid var(--line); }
  .proof-item:nth-child(-n+2) { border-top: 0; }
  .manifesto-grid { grid-template-columns: 1fr; gap: 24px; }
  .manifesto-note { position: static; }
  .section-heading { grid-template-columns: 1fr; gap: 24px; }
  .systems { grid-template-columns: 1fr; }
  .system { min-height: auto; border-left: 0; border-top: 1px solid var(--line-dark); }
  .system:first-child { border-top: 0; }
  .system-number { margin-bottom: 50px; }
  .offer:nth-child(1), .offer:nth-child(2), .offer:nth-child(3) { grid-column: span 12; min-height: 360px; }
  .process-card { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 190px 1fr; gap: 48px; }
  .cta-grid { grid-template-columns: 1fr; }
  .cta-action { text-align: left; }
  .book-hero-grid { grid-template-columns: 1fr; }
  .book-hero-copy { max-width: 800px; }
  .book-cover-stage { width: min(620px, 84%); margin-left: auto; }
  .book-rail-grid, .book-premise-grid, .book-author-grid { grid-template-columns: 1fr; }
  .book-side-note { max-width: 420px; }
  .book-section-heading { grid-template-columns: 1fr; gap: 24px; }
  .book-system-grid { grid-template-columns: 1fr; }
  .book-system-card { min-height: 300px; border-left: 0; border-top: 1px solid rgba(255,255,255,.28); }
  .book-system-card:first-child { border-top: 0; }
  .book-reader-grid { grid-template-columns: 1fr; }
  .book-purchase-intro { grid-template-columns: 1fr; gap: 24px; }
  .book-author-mark { width: 180px; }
  .footer-top { grid-template-columns: 1fr; }
  .footer-links { justify-content: flex-start; }
}

@media (max-width: 680px) {
  .shell { width: min(100% - 30px, var(--max)); }
  .brand-name { max-width: 145px; font-size: .81rem; line-height: 1.05; }
  .hero { padding: 34px 0 68px; }
  h1 { font-size: clamp(3.6rem, 18vw, 5.6rem); }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .hero-actions .button { width: 100%; }
  .portrait-stage { width: calc(100% - 12px); padding: 16px 0 0 16px; }
  .portrait-stage::before { inset: 0 16px 16px 0; }
  .portrait-card, .portrait-card img { min-height: 430px; }
  .portrait-card { box-shadow: 12px 12px 0 var(--blue); }
  .coordinate.top { right: -5px; }
  .proof-grid { grid-template-columns: 1fr; }
  .proof-item, .proof-item:nth-child(3) { min-height: 120px; padding: 24px 0; border-left: 0; border-top: 1px solid var(--line); }
  .proof-item:first-child { border-top: 0; }
  .manifesto, .method, .offers, .about, .cta { padding-top: 92px; padding-bottom: 92px; }
  .manifesto-text, .about-columns { grid-template-columns: 1fr; gap: 8px; }
  .systems { border-left: 0; border-right: 0; }
  .system { padding: 34px 12px; }
  .method-line { display: none; }
  .offer { padding: 28px; }
  .process { padding-bottom: 92px; }
  .process-steps { padding-inline: 24px; }
  .step { grid-template-columns: 46px 1fr; gap: 12px; }
  .about-grid { grid-template-columns: 1fr; }
  .about-stamp { width: 150px; }
  .cta h2 { font-size: clamp(3.5rem, 17vw, 5.8rem); }
  .book-hero { padding: 42px 0 78px; }
  .book-title { font-size: clamp(4.8rem, 26vw, 7rem); }
  .book-buy-row { align-items: stretch; flex-direction: column; }
  .book-buy-row .button { width: 100%; }
  .book-price { padding: 16px 0 0; border-top: 1px solid var(--line-dark); border-left: 0; }
  .book-meta { gap: 7px; }
  .book-cover-stage { width: calc(100% - 13px); padding: 22px 8px 30px 12px; }
  .book-cover-stage::before { inset: 0 0 8px 24px; }
  .book-cover-frame { box-shadow: 11px 11px 0 var(--blue), -8px -8px 0 var(--book-orange); }
  .book-caption { left: -3px; font-size: .58rem; }
  .book-rail-grid { min-height: 0; padding: 30px 0; gap: 15px; }
  .book-premise, .book-systems, .book-reader, .book-author, .book-purchase { padding-top: 90px; padding-bottom: 90px; }
  .book-premise-copy, .book-author-copy { grid-template-columns: 1fr; gap: 8px; }
  .book-system-grid { border-left: 0; border-right: 0; }
  .book-system-card { min-height: 280px; padding: 32px 12px; }
  .book-reader-list > div { grid-template-columns: 45px 1fr; gap: 10px; }
  .book-author-mark { width: 145px; }
  .book-purchase h2 { font-size: clamp(3.5rem, 17vw, 5.8rem); }
  .book-editions { grid-template-columns: 1fr; }
  .book-edition-card { min-height: 0; }
  .book-edition-print { box-shadow: 9px 9px 0 var(--blue); }
  .footer-bottom { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  [data-reveal] { opacity: 1; transform: none; }
}