/* Páginas del framework ANVERSO (anverso.html / anverso-es.html). Misma paleta que la landing. */
:root {
  --paper: #F6F4EF; --white: #FFFFFF; --deep: #EEEBE4;
  --ink: #161412; --ink-soft: #3B3631; --mute: #6E665B;
  --coral: #E4403F; --coral-deep: #B92E2F; --hl: #F08A80;
  --line: rgba(22, 20, 18, 0.1);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 5rem; -webkit-text-size-adjust: 100%; }
body {
  background: var(--paper); color: var(--ink);
  font-family: Lora, Georgia, 'Times New Roman', serif; line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--ink); text-decoration: underline; text-decoration-color: var(--coral); text-decoration-thickness: 2px; text-underline-offset: 5px; }
a:hover { color: var(--coral-deep); }
.sans { font-family: 'Open Sans', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif; }
.wrap { max-width: 50rem; margin: 0 auto; padding: 0 1.25rem; }
@media (min-width: 640px) { .wrap { padding: 0 2rem; } }

nav.top {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255, 255, 255, 0.88); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  padding-top: env(safe-area-inset-top, 0px);
}
nav.top .wrap { max-width: 72rem; height: 4rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
nav.top .brand { text-decoration: none; font-weight: 600; font-size: 1.15rem; white-space: nowrap; }
nav.top .brand i { font-weight: 400; font-size: 0.85rem; color: var(--mute); margin-right: 0.3rem; }
nav.top .right { display: flex; align-items: center; gap: 0.5rem; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem;
  font-family: 'Open Sans', system-ui, sans-serif; font-weight: 600; font-size: 0.92rem;
  border-radius: 999px; padding: 0.7rem 1.4rem; text-decoration: none; transition: background 0.2s, color 0.2s;
}
.btn-ink { background: var(--ink); color: #fff; }
.btn-ink:hover { background: var(--coral-deep); color: #fff; }
.btn-line { border: 1px solid rgba(22, 20, 18, 0.25); color: var(--ink-soft); padding: 0.5rem 0.85rem; font-size: 0.75rem; letter-spacing: 0.08em; }
.btn-line:hover { border-color: var(--ink); color: var(--ink); }
nav.top .btn-ink { padding: 0.5rem 1rem; font-size: 0.85rem; }

.label {
  font-family: 'Open Sans', system-ui, sans-serif; font-variant: small-caps; text-transform: lowercase;
  letter-spacing: 0.14em; font-size: 0.85rem; font-weight: 600; color: var(--coral-deep);
  display: flex; align-items: center; gap: 0.5rem; margin-bottom: 1rem;
}
.label svg { width: 1.05em; height: 1.05em; }

header.hero { background: var(--white); border-bottom: 1px solid var(--line); padding: 4.5rem 0 3.5rem; }
h1 { font-size: clamp(2.2rem, 5.4vw, 3.6rem); line-height: 1.06; letter-spacing: -0.015em; font-weight: 700; margin-bottom: 1.5rem; }
h1 em { font-weight: 500; color: var(--coral-deep); }
h2 { font-size: clamp(1.7rem, 3.6vw, 2.4rem); line-height: 1.15; letter-spacing: -0.01em; font-weight: 600; margin-bottom: 1.1rem; }
h3 { font-size: 1.4rem; line-height: 1.25; font-weight: 600; margin-bottom: 0.75rem; }
p { margin-bottom: 1.1rem; color: var(--ink-soft); font-size: 1.075rem; }
.lead { font-size: 1.2rem; color: var(--ink); }
.byline { font-family: 'Open Sans', system-ui, sans-serif; font-size: 0.92rem; color: var(--mute); margin: -0.6rem 0 1.4rem; }
.byline a { color: var(--ink-soft); text-underline-offset: 4px; }
ul { margin: 0 0 1.1rem; list-style: none; }
li { position: relative; padding-left: 1.2rem; margin-bottom: 0.55rem; color: var(--ink-soft); }
li::before { content: ''; position: absolute; left: 0; top: 0.72em; width: 6px; height: 6px; border-radius: 50%; background: var(--coral); }
mark { background: linear-gradient(transparent 12%, var(--hl) 12%, var(--hl) 92%, transparent 92%); color: inherit; padding: 0 0.12em; }

.letters { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.75rem; margin-top: 2.25rem; }
@media (min-width: 760px) { .letters { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.letters a {
  display: block; text-decoration: none; background: var(--paper); border: 1px solid var(--line);
  border-radius: 1rem; padding: 1rem 1.1rem; transition: border-color 0.2s, transform 0.2s;
}
.letters a:hover { border-color: var(--ink); transform: translateY(-2px); color: var(--ink); }
.letters b {
  display: inline-flex; align-items: center; justify-content: center; min-width: 2.6rem; height: 2.6rem; padding: 0 0.6rem;
  border-radius: 999px; background: var(--ink); color: #fff; font-size: 1rem; margin-bottom: 0.6rem;
}
.letters span { display: block; font-weight: 600; font-size: 1.05rem; }
.letters small { display: block; font-family: 'Open Sans', system-ui, sans-serif; font-size: 0.8rem; color: var(--mute); line-height: 1.45; margin-top: 0.2rem; }

section.block { padding: 4.5rem 0; border-bottom: 1px solid var(--line); }
section.white { background: var(--white); }
section.deep { background: var(--deep); }

.rule { display: grid; gap: 1.5rem; align-items: center; margin: 1.75rem 0 1.5rem; background: var(--white); border: 1px solid var(--line); border-radius: 1.75rem; padding: 1.75rem; }
@media (min-width: 640px) { .rule { grid-template-columns: 15rem 1fr; padding: 2rem 2.25rem; } }
.rule img { mix-blend-mode: multiply; width: 100%; max-width: 15rem; margin: 0 auto; }
.rule .eq { font-size: clamp(1.8rem, 4vw, 2.4rem); font-weight: 700; line-height: 1.1; margin-bottom: 0.75rem; color: var(--ink); white-space: nowrap; }

.model { display: grid; gap: 1.25rem; grid-template-columns: auto 1fr; padding: 2.25rem 0; border-top: 1px solid var(--line); }
.model:first-of-type { border-top: 0; padding-top: 0.5rem; }
.model .k {
  display: flex; align-items: center; justify-content: center; min-width: 3.6rem; height: 3.6rem; padding: 0 0.7rem;
  border-radius: 999px; background: var(--ink); color: #fff; font-weight: 700; font-size: 1.15rem;
}
.model .step { font-family: 'Open Sans', system-ui, sans-serif; font-size: 0.75rem; font-weight: 600; color: var(--mute); display: block; margin-bottom: 0.25rem; }
.doodle { mix-blend-mode: multiply; }
.split { display: grid; gap: 2rem; align-items: center; }
@media (min-width: 760px) { .split { grid-template-columns: 1.4fr 1fr; } }

.compare p strong { color: var(--ink); }

.cta-block {
  background: var(--ink); color: #fff; border-radius: 2rem; padding: 2.5rem 1.75rem; margin: 4.5rem auto; text-align: center;
  display: grid; gap: 2rem; align-items: center;
}
@media (min-width: 700px) { .cta-block { grid-template-columns: 11rem 1fr; text-align: left; padding: 2.75rem; } }
.cta-block img { width: 11rem; margin: 0 auto; border-radius: 3px; transform: rotate(-2deg); box-shadow: 0 18px 40px -14px rgba(0,0,0,0.6); }
.cta-block h2 { color: #fff; }
.cta-block p { color: rgba(255, 255, 255, 0.75); }
.cta-block .btn-ink { background: var(--coral); }
.cta-block .btn-ink:hover { background: var(--coral-deep); }
.cta-block .alt { font-family: 'Open Sans', system-ui, sans-serif; font-size: 0.88rem; margin: 1rem 0 0; }
.cta-block .alt a { color: #fff; text-decoration-color: rgba(255,255,255,0.4); }

footer { background: var(--ink); color: rgba(255, 255, 255, 0.6); padding: 3rem 0 calc(3rem + env(safe-area-inset-bottom, 0px)); font-family: 'Open Sans', system-ui, sans-serif; font-size: 0.88rem; }
footer .wrap { max-width: 72rem; display: flex; flex-wrap: wrap; gap: 0.75rem 1.5rem; align-items: center; justify-content: space-between; }
footer a { color: rgba(255, 255, 255, 0.8); text-decoration: none; }
footer a:hover { color: #fff; }
footer .links { display: flex; flex-wrap: wrap; gap: 0.5rem 1.25rem; }