:root {
  --navy: #1f3a4d; --navy-d: #142836; --rust: #c4622d; --rust-d: #a84f20; --rust-l: #f0a46f;
  --cream: #fbf8f2; --sand: #f3ede3; --line: #e6dccb; --ink: #1f1d1b; --mute: #5a544b; --green: #3f7d4a;
  --serif: 'Source Serif 4', Georgia, serif; --slab: 'Roboto Slab', Georgia, serif; --sans: Inter, system-ui, Arial, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
body { margin: 0; font: 19px/1.6 var(--serif); color: var(--ink); background: var(--cream); -webkit-font-smoothing: antialiased; }
img { max-width: 100%; display: block; }
a { color: inherit; }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 820px; }
.center { text-align: center; }

/* botones */
.btn { display: inline-block; background: var(--rust); color: #fff; text-decoration: none; font: 700 17px/1 var(--sans); padding: 17px 26px; border-radius: 8px; box-shadow: 0 6px 18px rgba(196, 98, 45, .32); transition: transform .15s, background .15s; }
.btn:hover { background: var(--rust-d); transform: translateY(-1px); }
.btn-lg { font-size: 19px; padding: 21px 32px; }
.btn-sm { font-size: 14.5px; padding: 11px 16px; box-shadow: none; }
.btn-block { display: block; text-align: center; width: 100%; }
.btn-ghost { font: 600 17px var(--sans); color: #fff; text-decoration: none; opacity: .92; }
.btn-ghost:hover { opacity: 1; text-decoration: underline; }

/* barra */
.topbar { position: sticky; top: 0; z-index: 30; background: rgba(20, 40, 54, .96); backdrop-filter: blur(6px); color: #fff; }
.topbar-in { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; font: 800 13px/1.15 var(--sans); letter-spacing: 1.6px; text-transform: uppercase; }
.brand img { width: 42px; height: 42px; border-radius: 50%; object-fit: cover; box-shadow: 0 0 0 2px var(--rust); }
.nav { display: flex; align-items: center; gap: 26px; }
.nav a:not(.btn) { font: 600 15.5px var(--sans); text-decoration: none; opacity: .85; }
.nav a:not(.btn):hover { opacity: 1; }

/* hero */
.hero { position: relative; color: #fff; overflow: hidden; background: var(--navy-d); }
.hero-bg { position: absolute; inset: 0; background-size: cover; background-position: center 60%; opacity: .45; }
.hero::after { content: ''; position: absolute; inset: 0; background: linear-gradient(100deg, rgba(14, 28, 38, .96) 0%, rgba(14, 28, 38, .82) 45%, rgba(14, 28, 38, .35) 100%); }
.hero-in { position: relative; z-index: 1; display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center; padding-top: 84px; padding-bottom: 96px; }
.kicker, .eyebrow { font: 800 13.5px var(--sans); letter-spacing: 3.5px; text-transform: uppercase; color: var(--rust); margin-bottom: 14px; }
.hero .kicker { color: var(--rust-l); }
.hero h1 { font: 800 clamp(40px, 5.4vw, 66px)/1.04 var(--slab); margin: 0 0 22px; letter-spacing: -.5px; }
.hero h1 span { color: var(--rust-l); }
.lead { font-size: 22px; line-height: 1.55; color: #ede6da; margin: 0 0 32px; max-width: 600px; }
.hero-cta { display: flex; align-items: center; gap: 26px; flex-wrap: wrap; margin-bottom: 34px; }
.hero-facts { list-style: none; padding: 0; margin: 0; display: flex; gap: 28px; flex-wrap: wrap; font: 500 15.5px var(--sans); color: #d9d1c3; }
.hero-facts b { color: #fff; font-size: 22px; font-family: var(--slab); margin-right: 4px; }
.hero-book { position: relative; display: flex; justify-content: center; }
.book3d { perspective: 1600px; }
.book3d img { width: min(380px, 80vw); border-radius: 3px 8px 8px 3px; transform: rotateY(-16deg) rotateX(3deg); box-shadow: -2px 0 0 #0b161e inset, 22px 30px 50px rgba(0, 0, 0, .55), 6px 6px 0 #d8cdbd, 9px 9px 0 #cfc3b0; }
.badge { position: absolute; bottom: -14px; right: 4%; background: #fff; color: var(--navy); font: 600 14px/1.35 var(--sans); padding: 12px 16px; border-radius: 10px; box-shadow: 0 10px 30px rgba(0, 0, 0, .35); border-left: 5px solid var(--rust); }
.badge b { font-weight: 800; }

/* secciones */
.sec { padding: 96px 0; }
.h2 { font: 800 clamp(30px, 3.6vw, 44px)/1.12 var(--slab); color: var(--navy); margin: 0 0 22px; letter-spacing: -.3px; }
.sub { font-size: 20px; color: var(--mute); max-width: 720px; margin: 0 auto 40px; }
.big { font-size: 21px; line-height: 1.65; }
.problem { background: #fff; border-bottom: 1px solid var(--line); }
.problem .h2 { text-align: center; }

.cards3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; margin-top: 44px; }
.card { background: #fff; border-radius: 14px; overflow: hidden; box-shadow: 0 2px 0 var(--line), 0 14px 34px rgba(31, 58, 77, .08); display: flex; flex-direction: column; }
.card img { aspect-ratio: 16/10; object-fit: cover; width: 100%; }
.card-b { padding: 24px 26px 28px; }
.tag { display: inline-block; font: 800 12px var(--sans); letter-spacing: 2px; text-transform: uppercase; color: #fff; background: var(--navy); padding: 6px 10px; border-radius: 4px; margin-bottom: 14px; }
.card h3 { font: 700 22px/1.25 var(--slab); color: var(--navy); margin: 0 0 12px; }
.card p { margin: 0; font-size: 17.5px; color: #3a3631; }

.inside { background: var(--sand); }
.part { display: grid; grid-template-columns: .9fr 1.1fr; gap: 0; background: #fff; border-radius: 16px; overflow: hidden; margin-top: 40px; box-shadow: 0 14px 34px rgba(31, 58, 77, .08); }
.part.rev .part-img { order: 2; }
.part-img { min-height: 380px; background-size: cover; background-position: center; position: relative; display: flex; flex-direction: column; justify-content: flex-end; padding: 30px; color: #fff; }
.part-img::before { content: ''; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(14, 28, 38, .85), rgba(14, 28, 38, 0) 60%); }
.part-img span, .part-img b { position: relative; }
.part-img span { font: 800 13px var(--sans); letter-spacing: 3.5px; text-transform: uppercase; color: var(--rust-l); }
.part-img b { font: 800 50px/1.05 var(--slab); }
.part-b { padding: 36px 40px; }
.part-b ol { margin: 0; padding-left: 32px; }
.part-b li { margin: 0 0 14px; font-size: 18px; line-height: 1.5; }
.part-b li::marker { font: 800 17px var(--slab); color: var(--rust); }
.part-b li b { color: var(--navy); font-family: var(--slab); font-weight: 700; }
.appx { margin: 18px 0 0; padding-top: 16px; border-top: 1px dashed var(--line); font: 500 15.5px/1.5 var(--sans); color: var(--mute); }
.appx b { color: var(--navy); }

.look { background: #fff; }
.eyebrow.center { display: block; }
.pages { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.pg { border: 0; padding: 0; background: none; cursor: zoom-in; text-align: left; }
.pg img { width: 100%; aspect-ratio: 8.5/11; object-fit: cover; object-position: top; border-radius: 4px; box-shadow: 0 1px 0 var(--line), 0 16px 34px rgba(31, 58, 77, .16); transition: transform .2s; }
.pg:hover img { transform: translateY(-4px); }
.pg span { display: block; font: 700 15px var(--sans); color: var(--navy); margin-top: 14px; }

.diagrams { background: var(--navy-d); color: #fff; }
.light { color: #fff !important; }
.eyebrow.light { color: var(--rust-l) !important; }
.dg-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 40px; }
.dg-grid figure { margin: 0; background: #fbf8f2; border-radius: 10px; overflow: hidden; }
.dg-grid img { width: 100%; aspect-ratio: 4/3; object-fit: contain; background: #fbf8f2; padding: 10px; }
.dg-grid figcaption { font: 700 15px var(--sans); color: var(--navy); padding: 12px 16px 14px; border-top: 1px solid var(--line); }

.two { display: grid; grid-template-columns: 1.1fr .9fr; gap: 56px; align-items: center; }
.checks { list-style: none; padding: 0; margin: 10px 0 0; }
.checks li { position: relative; padding-left: 42px; margin: 0 0 15px; font-size: 19px; }
.checks li::before { content: '✓'; position: absolute; left: 0; top: 1px; width: 28px; height: 28px; border-radius: 50%; background: var(--green); color: #fff; font: 800 15px/28px var(--sans); text-align: center; }
.outcome-img img { border-radius: 14px; box-shadow: 0 20px 44px rgba(31, 58, 77, .2); aspect-ratio: 4/5; object-fit: cover; }

.guide { background: var(--sand); }
.guide-in { display: grid; grid-template-columns: 260px 1fr; gap: 54px; align-items: center; max-width: 1000px; }
.guide-face { width: 260px; height: 260px; border-radius: 50%; object-fit: cover; box-shadow: 0 0 0 7px #fff, 0 0 0 10px var(--rust), 0 20px 40px rgba(0, 0, 0, .2); }
.guide blockquote { margin: 22px 0 0; padding: 4px 0 4px 22px; border-left: 4px solid var(--rust); font: italic 22px/1.5 var(--serif); color: var(--navy); }

.honest { background: #fff; }
.two-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.col { border-radius: 14px; padding: 32px 34px; }
.col h3 { font: 700 24px var(--slab); margin: 0 0 16px; }
.col ul { margin: 0; padding-left: 22px; }
.col li { margin: 0 0 12px; font-size: 18px; }
.yes { background: #eef5ec; } .yes h3 { color: #2f6a3a; }
.no { background: #fdf0ea; } .no h3 { color: #b4401a; }

.buy { background: linear-gradient(180deg, var(--cream), var(--sand)); }
.buy-in { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; max-width: 1040px; }
.buy-book { display: flex; justify-content: center; }
.price-card { background: #fff; border-radius: 18px; padding: 42px 40px 34px; box-shadow: 0 2px 0 var(--line), 0 26px 60px rgba(31, 58, 77, .16); border-top: 6px solid var(--rust); }
.price-card h2 { font: 800 38px/1.1 var(--slab); color: var(--navy); margin: 0; }
.pc-sub { margin: 4px 0 18px; color: var(--mute); font-size: 18px; }
.price { font: 800 76px/1 var(--slab); color: var(--navy); }
.price .cur { font-size: 36px; vertical-align: top; position: relative; top: 10px; margin-right: 2px; }
.pc-note { margin: 8px 0 22px; font: 500 15.5px var(--sans); color: var(--mute); }
.incl { list-style: none; padding: 0; margin: 0 0 28px; }
.incl li { position: relative; padding-left: 30px; margin: 0 0 11px; font: 500 16.5px/1.45 var(--sans); }
.incl li::before { content: '✓'; position: absolute; left: 0; color: var(--green); font-weight: 800; }
.secure { text-align: center; font: 500 14px var(--sans); color: var(--mute); margin: 14px 0 0; }
.checkout-msg { text-align: center; font: 700 15px var(--sans); color: var(--rust-d); margin: 10px 0 0; }

.faq details { background: #fff; border: 1px solid var(--line); border-radius: 12px; margin: 0 0 14px; padding: 0 26px; }
.faq summary { cursor: pointer; list-style: none; font: 700 20px/1.35 var(--slab); color: var(--navy); padding: 22px 30px 22px 0; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; position: absolute; right: 0; top: 18px; font: 600 28px var(--sans); color: var(--rust); }
.faq details[open] summary::after { content: '–'; }
.faq details p { margin: 0 0 22px; font-size: 18px; color: #3a3631; }

.final { position: relative; color: #fff; text-align: center; overflow: hidden; background: var(--navy-d); }
.final-bg { position: absolute; inset: 0; background-size: cover; background-position: center; opacity: .4; }
.final-in { position: relative; padding: 110px 24px; }
.final h2 { font: 800 clamp(36px, 4.6vw, 56px)/1.1 var(--slab); margin: 0 0 14px; }
.final p { font-size: 21px; color: #ede6da; margin: 0 auto 32px; max-width: 640px; }

.foot { background: #0e1c26; color: #c9c2b6; padding: 44px 0 90px; }
.foot-in { display: grid; grid-template-columns: auto 1fr; gap: 20px 40px; align-items: center; }
.foot .brand { color: #fff; }
.foot nav { justify-self: end; display: flex; gap: 24px; font: 600 15px var(--sans); }
.foot nav a { text-decoration: none; }
.fine { grid-column: 1 / -1; font: 400 13.5px/1.6 var(--sans); margin: 0; opacity: .75; }

.lightbox { position: fixed; inset: 0; z-index: 60; background: rgba(8, 16, 22, .9); display: flex; align-items: center; justify-content: center; padding: 24px; }
.lightbox[hidden] { display: none; }
.lightbox img { max-height: 92vh; max-width: 92vw; border-radius: 4px; box-shadow: 0 20px 60px rgba(0, 0, 0, .6); }
.lightbox button { position: absolute; top: 16px; right: 22px; background: none; border: 0; color: #fff; font: 300 46px var(--sans); cursor: pointer; }

.sticky-buy { display: none; }

@media (max-width: 960px) {
  body { font-size: 18px; }
  .nav a:not(.btn) { display: none; }
  .hero-in { grid-template-columns: 1fr; padding-top: 56px; padding-bottom: 72px; text-align: left; }
  .hero-book { order: -1; }
  .book3d img { width: min(250px, 64vw); }
  .badge { right: 2%; bottom: -10px; font-size: 13px; }
  .cards3, .pages, .dg-grid { grid-template-columns: 1fr 1fr; }
  .part, .two, .buy-in, .two-cols { grid-template-columns: 1fr; }
  .part.rev .part-img { order: 0; }
  .part-img { min-height: 240px; }
  .guide-in { grid-template-columns: 1fr; text-align: center; justify-items: center; }
  .guide blockquote { text-align: left; }
  .sec { padding: 72px 0; }
}
@media (max-width: 600px) {
  .wrap { padding: 0 16px; }
  .cards3, .pages, .dg-grid { grid-template-columns: 1fr; }
  .pages { grid-template-columns: 1fr 1fr; gap: 16px; }
  .lead { font-size: 19.5px; }
  .hero-facts { gap: 14px 22px; font-size: 14.5px; }
  .part-b { padding: 26px 22px; }
  .price-card { padding: 32px 22px 26px; }
  .faq details { padding: 0 18px; }
  .guide-face { width: 200px; height: 200px; }
  .foot-in { grid-template-columns: 1fr; }
  .foot nav { justify-self: start; }
  .sticky-buy { display: flex; position: fixed; left: 0; right: 0; bottom: 0; z-index: 40; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 16px; background: rgba(20, 40, 54, .97); color: #fff; font: 600 15px var(--sans); transform: translateY(100%); transition: transform .25s; }
  .sticky-buy.on { transform: none; }
}

.legal-page p { font-size: 18px; margin: 0 0 18px; }
.legal-page b { color: var(--navy); }
.fine-dark { font: 500 14px var(--sans); color: var(--mute); margin-top: 30px !important; }

.btn.busy { opacity: .75; pointer-events: none; }
.pay-methods { text-align: center; font: 500 14px var(--sans); color: var(--mute); margin: 12px 0 0; }
.pay-methods b { color: #635bff; }

/* página de descarga */
.dl { background: linear-gradient(180deg, var(--cream), var(--sand)); padding: 80px 0 96px; }
.dl-in { display: grid; grid-template-columns: .8fr 1.2fr; gap: 56px; align-items: center; max-width: 1040px; }
.dl-book { display: flex; justify-content: center; }
.dl-card { background: #fff; border-radius: 18px; padding: 40px 40px 34px; border-top: 6px solid var(--rust); box-shadow: 0 2px 0 var(--line), 0 26px 60px rgba(31, 58, 77, .16); }
.dl-card h1 { font: 800 34px/1.15 var(--slab); color: var(--navy); margin: 0 0 14px; }
.dl-card p { font-size: 18px; margin: 0 0 18px; }
.eyebrow.ok { color: var(--green); }
.eyebrow.err { color: #b4401a; }
.dl-mail { background: var(--sand); border-radius: 10px; padding: 14px 16px; font-size: 16.5px !important; margin-top: 20px !important; }
.dl-tips { margin: 18px 0 0; padding-left: 20px; font: 500 15.5px/1.5 var(--sans); color: #3a3631; }
.dl-tips li { margin: 0 0 8px; }
.spinner { width: 42px; height: 42px; border: 4px solid var(--line); border-top-color: var(--rust); border-radius: 50%; animation: spin 0.9s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
@media (max-width: 960px) { .dl-in { grid-template-columns: 1fr; } .dl-book .book3d img { width: min(200px, 55vw); } .dl { padding: 48px 0 72px; } }
@media (max-width: 600px) { .dl-card { padding: 30px 22px 26px; } .dl-card h1 { font-size: 28px; } }