:root {
  --bg: #fbfbf8;
  --paper: #ffffff;
  --soft: #f2f4ef;
  --ink: #171916;
  --muted: #676c65;
  --line: #dfe3dc;
  --accent: #6b7bff;
  --accent-dark: #4d5fe3;
  --accent-soft: #eef0ff;
  --radius: 22px;
  --shadow: 0 22px 65px rgba(22, 27, 22, 0.10);
  --container: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
.container { width: min(calc(100% - 40px), var(--container)); margin-inline: auto; }
.narrow { max-width: 900px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(251,251,248,.88);
  border-bottom: 1px solid rgba(223,227,220,.75);
  backdrop-filter: blur(14px);
}
.nav-wrap { height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { text-decoration: none; font-size: 14px; font-weight: 900; letter-spacing: .08em; }
.brand span { color: var(--accent); }
.nav { display: flex; align-items: center; gap: 26px; font-size: 14px; }
.nav a { text-decoration: none; color: var(--muted); font-weight: 650; }
.nav a:hover { color: var(--ink); }
.nav .nav-cta { color: var(--ink); border: 1px solid var(--line); border-radius: 999px; padding: 9px 15px; background: var(--paper); }

.hero { padding: 84px 0 72px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.08fr .72fr; gap: 80px; align-items: center; }
.eyebrow { margin: 0 0 18px; font-size: 12px; font-weight: 850; letter-spacing: .15em; color: var(--accent-dark); }
h1, h2, h3 { line-height: 1.05; letter-spacing: -.035em; margin-top: 0; }
h1 { max-width: 780px; font-size: clamp(48px, 7vw, 86px); margin-bottom: 26px; }
h1 span { color: var(--accent); }
h2 { font-size: clamp(34px, 4vw, 54px); margin-bottom: 24px; }
h3 { font-size: 22px; }
.hero-lead { max-width: 720px; font-size: clamp(18px, 2vw, 22px); color: var(--muted); margin: 0 0 34px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 28px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 52px; padding: 0 23px; border-radius: 999px; text-decoration: none; font-weight: 800; transition: .2s ease; }
.button.primary { color: #fff; background: var(--ink); }
.button.primary:hover { transform: translateY(-2px); background: #000; }
.button.ghost { background: var(--paper); border: 1px solid var(--line); }
.button.ghost:hover { border-color: #bfc4bb; }
.trust-list { display: flex; flex-wrap: wrap; gap: 8px 20px; padding: 0; margin: 0; list-style: none; color: var(--muted); font-size: 14px; }
.trust-list li::before { content: "•"; color: var(--accent); margin-right: 8px; }

.hero-art { position: relative; max-width: 420px; margin-left: auto; }
.hero-art img { position: relative; z-index: 2; border-radius: 4px; box-shadow: var(--shadow); transform: rotate(2deg); }
.book-shadow { position: absolute; inset: 12% -18% -4% 18%; background: var(--accent-soft); border-radius: 50%; filter: blur(10px); transform: rotate(-8deg); }

.strip { border-block: 1px solid var(--line); background: var(--paper); }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); }
.stats div { padding: 25px 28px; border-right: 1px solid var(--line); text-align: center; }
.stats div:last-child { border-right: 0; }
.stats strong { display: block; font-size: 30px; line-height: 1; letter-spacing: -.04em; }
.stats span { display: block; margin-top: 7px; font-size: 13px; color: var(--muted); }

.section { padding: 104px 0; }
.section.soft { background: var(--soft); }
.section-intro { max-width: 780px; color: var(--muted); font-size: 19px; margin-bottom: 42px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; }
.card-number { display: inline-block; color: var(--accent-dark); font-weight: 900; font-size: 13px; margin-bottom: 34px; }
.card p { margin-bottom: 0; color: var(--muted); }

.category-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: 40px; }
.category-grid article { display: grid; grid-template-columns: 46px 150px 1fr; gap: 16px; align-items: baseline; padding: 23px 24px; border-radius: 18px; background: var(--paper); border: 1px solid var(--line); }
.category-grid b { color: var(--accent-dark); font-size: 13px; }
.category-grid h3 { font-size: 19px; margin: 0; letter-spacing: -.02em; }
.category-grid p { margin: 0; color: var(--muted); font-size: 14px; }

.sample-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; align-items: center; }
.note { padding-left: 18px; border-left: 3px solid var(--accent); color: var(--muted); }
.prompt-card { position: relative; background: #191b19; color: #fff; border-radius: 26px; padding: 40px; box-shadow: var(--shadow); }
.prompt-card span { font-size: 11px; letter-spacing: .16em; font-weight: 900; color: #aeb6ff; }
.prompt-card p { margin: 24px 0 0; font-size: 20px; line-height: 1.65; }

.audience-list { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 36px; }
.audience-list div { display: flex; gap: 14px; padding: 22px; background: var(--paper); border: 1px solid var(--line); border-radius: 18px; }
.audience-list span { color: var(--accent-dark); font-weight: 900; }
.audience-list p { margin: 0; color: var(--muted); }

.buy-section { background: #181a18; color: #fff; }
.buy-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 60px; align-items: start; }
.buy-copy .eyebrow { color: #aeb6ff; }
.buy-copy > p:not(.eyebrow):not(.microcopy) { color: #b9bdb7; max-width: 520px; }
.price { margin-top: 30px; font-weight: 900; font-size: 68px; letter-spacing: -.06em; line-height: 1; }
.price span { font-size: 28px; vertical-align: top; position: relative; top: 9px; }
.price small { font-size: 16px; letter-spacing: 0; color: #b9bdb7; }
.microcopy { font-size: 13px; color: #969b94; }
.mini-cover { width: 250px; margin-top: 36px; border-radius: 3px; box-shadow: 0 15px 30px rgba(0,0,0,.3); }
.form-shell { background: #fff; color: var(--ink); border-radius: 28px; padding: 30px; min-height: 460px; }
.form-label { font-size: 11px; font-weight: 900; letter-spacing: .15em; color: var(--accent-dark); margin-bottom: 18px; }
.cognito-placeholder { min-height: 300px; border: 2px dashed #cfd4cb; border-radius: 20px; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 30px; background: #fafbf9; }
.cognito-placeholder strong { font-size: 15px; letter-spacing: .07em; }
.cognito-placeholder p { color: var(--muted); margin: 8px 0 18px; }
.cognito-placeholder code { max-width: 100%; background: var(--accent-soft); color: var(--accent-dark); padding: 10px 12px; border-radius: 8px; font-size: 12px; overflow-wrap: anywhere; }
.form-note { margin: 18px 4px 0; color: var(--muted); font-size: 13px; }

.faq details { border-top: 1px solid var(--line); }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; padding: 22px 0; list-style: none; font-weight: 800; font-size: 18px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; float: right; color: var(--accent-dark); }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: -4px 0 24px; max-width: 760px; color: var(--muted); }

.seo-copy { padding: 78px 0; background: var(--paper); border-top: 1px solid var(--line); }
.seo-copy h2 { font-size: 30px; letter-spacing: -.025em; }
.seo-copy p { color: var(--muted); }

.footer { padding: 35px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.footer-wrap { display: flex; justify-content: space-between; gap: 30px; }
.footer p { margin: 0; }
.legal { max-width: 620px; text-align: right; }

@media (max-width: 900px) {
  .nav a:not(.nav-cta) { display: none; }
  .hero { padding-top: 58px; }
  .hero-grid, .sample-grid, .buy-grid { grid-template-columns: 1fr; gap: 48px; }
  .hero-art { margin: 0 auto; max-width: 360px; }
  .stats { grid-template-columns: 1fr 1fr; }
  .stats div:nth-child(2) { border-right: 0; }
  .stats div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .feature-grid, .audience-list { grid-template-columns: 1fr; }
  .category-grid { grid-template-columns: 1fr; }
  .footer-wrap { flex-direction: column; }
  .legal { text-align: left; }
}

@media (max-width: 620px) {
  .container { width: min(calc(100% - 26px), var(--container)); }
  .site-header .nav-wrap { height: 64px; }
  .nav .nav-cta { padding: 8px 12px; }
  .hero { padding: 42px 0 50px; }
  h1 { font-size: 49px; }
  h2 { font-size: 36px; }
  .hero-lead { font-size: 18px; }
  .hero-actions .button { width: 100%; }
  .section { padding: 76px 0; }
  .category-grid article { grid-template-columns: 34px 1fr; }
  .category-grid article p { grid-column: 2; }
  .prompt-card { padding: 28px; }
  .prompt-card p { font-size: 18px; }
  .price { font-size: 58px; }
  .form-shell { padding: 18px; border-radius: 22px; }
}

/* Demo: una misma letra, tres prompts */
.demo-section { background: var(--paper); }
.demo-heading { max-width: 920px; margin-bottom: 46px; }
.demo-heading .section-intro { margin-bottom: 0; }
.lyrics-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
  padding: 34px;
  margin-bottom: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--soft);
}
.lyrics-label { font-size: 11px; font-weight: 900; letter-spacing: .14em; color: var(--accent-dark); }
.lyrics-card h3 { font-size: 28px; margin: 0; }
.lyrics-text { color: var(--muted); font-size: 14px; }
.audio-demo-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.audio-demo-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg);
}
.demo-number { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 50%; background: var(--accent-soft); color: var(--accent-dark); font-size: 12px; font-weight: 900; margin-bottom: 26px; }
.demo-kicker { margin: 0 0 10px; font-size: 11px; font-weight: 900; letter-spacing: .12em; color: var(--accent-dark); }
.audio-demo-card h3 { margin-bottom: 14px; font-size: 25px; }
.demo-description { min-height: 92px; margin: 0 0 20px; color: var(--muted); font-size: 15px; }
.mini-prompt { flex: 1; margin-bottom: 24px; padding: 16px; border-radius: 14px; background: var(--paper); color: var(--muted); font-size: 12px; line-height: 1.55; border: 1px solid var(--line); }
.mini-prompt strong { color: var(--ink); }
.audio-demo-card audio { width: 100%; height: 42px; }
.demo-conclusion { max-width: 780px; margin: 42px auto 0; text-align: center; }
.demo-conclusion strong { display: block; font-size: 26px; letter-spacing: -.03em; }
.demo-conclusion p { margin: 10px auto 22px; color: var(--muted); }

@media (max-width: 900px) {
  .lyrics-card { grid-template-columns: 1fr; }
  .lyrics-text { grid-template-columns: repeat(3, 1fr); }
  .audio-demo-grid { grid-template-columns: 1fr; }
  .demo-description { min-height: 0; }
}

@media (max-width: 620px) {
  .lyrics-card { padding: 24px; }
  .lyrics-text { grid-template-columns: 1fr; }
  .audio-demo-card { padding: 22px; }
  .demo-conclusion strong { font-size: 22px; }
}