/* ==========================================================================
   ESTILOS GENERALES: EL TALLER DE ANTES (SECRETOS DEL VIEJO MUNDO)
   ========================================================================== */

:root {
  --bg-crema: #f8f5ee;
  --bg-blanco: #ffffff;
  --bg-card: #fdfbf7;
  --bg-alt: #f0eae0;
  
  --ink: #141f28;
  --ink-soft: #2e3e4d;
  --ink-muted: #576877;
  --ink-light: #7c8e9d;
  
  --oxido: #c45b28;
  --oxido-hover: #ab4b1b;
  --oxido-glow: rgba(196, 91, 40, 0.28);
  
  --acero: #1b2d3d;
  --acero-dark: #0f1a24;
  --acero-light: #2c445a;
  
  --borde: #ded4c3;
  --borde-dark: #c2b59f;
  --borde-soft: #ebe3d5;
  
  --verde: #237844;
  --verde-bg: #e6f7ed;
  
  --font-serif: 'Roboto Slab', Georgia, serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  
  --shadow-sm: 0 2px 6px rgba(20, 31, 40, 0.06);
  --shadow-md: 0 8px 24px rgba(20, 31, 40, 0.10);
  --shadow-lg: 0 16px 40px rgba(20, 31, 40, 0.14);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 18px;
  line-height: 1.6;
  color: var(--ink);
  background-color: var(--bg-crema);
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-crema);
  color: var(--ink);
  overflow-x: hidden;
}

/* CONTENEDOR GENERAL */
.wrap {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

.text-center {
  text-align: center;
}

.max-800 {
  max-width: 820px;
  margin-left: auto;
  margin-right: auto;
}

/* ==========================================================================
   TIPOGRAFÍA Y BOTONES
   ========================================================================== */

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  color: var(--ink);
  font-weight: 800;
  line-height: 1.25;
}

p {
  margin-bottom: 1rem;
}

p:last-child {
  margin-bottom: 0;
}

.accent-title {
  color: var(--oxido);
}

/* BOTONES */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-family: var(--font-sans);
  font-weight: 700;
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all 0.22s ease-in-out;
  cursor: pointer;
  border: none;
  background-color: var(--oxido);
  color: #ffffff !important;
  box-shadow: 0 4px 14px var(--oxido-glow);
}

.btn:hover {
  background-color: var(--oxido-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 22px var(--oxido-glow);
}

.btn-sm {
  font-size: 15px;
  padding: 10px 20px;
  min-height: 44px;
}

.btn-lg {
  font-size: 20px;
  padding: 18px 36px;
  min-height: 62px;
  letter-spacing: 0.5px;
}

.btn-block {
  width: 100%;
  display: flex;
}

.btn-pulse {
  animation: pulse-glow 2.8s infinite ease-in-out;
}

@keyframes pulse-glow {
  0%, 100% {
    box-shadow: 0 4px 14px var(--oxido-glow);
  }
  50% {
    box-shadow: 0 6px 26px rgba(196, 91, 40, 0.48);
  }
}

/* ==========================================================================
   BARRA SUPERIOR DE URGENCIA
   ========================================================================== */

.urgency-bar {
  background: var(--acero-dark);
  color: #ffffff;
  padding: 12px 0;
  font-size: 14.5px;
  border-bottom: 2px solid var(--oxido);
}

.ub-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.ub-tag {
  background: var(--oxido);
  color: #ffffff;
  font-size: 12px;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  margin-right: 8px;
  letter-spacing: 0.5px;
}

.ub-timer {
  background: rgba(255, 255, 255, 0.10);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
}

.ub-digits {
  font-family: var(--font-sans);
  color: #f7b28d;
  font-weight: 800;
  letter-spacing: 0.5px;
}

.ub-btn {
  background: var(--oxido);
  color: #ffffff;
  text-decoration: none;
  font-weight: 700;
  font-size: 13.5px;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: opacity 0.2s;
}

.ub-btn:hover {
  opacity: 0.9;
}

/* ==========================================================================
   HEADER
   ========================================================================== */

.head {
  background: var(--bg-blanco);
  border-bottom: 1px solid var(--borde);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 90;
}

.head-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--oxido);
}

.brand-info {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 16px;
  letter-spacing: 1.5px;
  color: var(--ink);
}

.brand-sub {
  font-size: 12.5px;
  color: var(--ink-muted);
}

.head-nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

.head-nav a:not(.btn) {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 15px;
  font-weight: 600;
  transition: color 0.2s;
}

.head-nav a:not(.btn):hover {
  color: var(--oxido);
}

/* ==========================================================================
   SECCIÓN 1: HERO
   ========================================================================== */

.hero {
  padding: 64px 0 54px;
  background: radial-gradient(circle at 10% 20%, #ffffff 0%, var(--bg-crema) 80%);
  border-bottom: 1px solid var(--borde);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-alt);
  color: var(--acero);
  border: 1px solid var(--borde);
  font-size: 12.5px;
  font-weight: 800;
  letter-spacing: 1.5px;
  padding: 6px 14px;
  border-radius: 50px;
  margin-bottom: 20px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--oxido);
}

.hero-title {
  font-size: 42px;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.hero-sub {
  font-size: 20px;
  line-height: 1.55;
  color: var(--ink-soft);
  margin-bottom: 28px;
}

.hero-points {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 34px;
}

.hp-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 17.5px;
  color: var(--ink);
}

.hp-check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--verde-bg);
  color: var(--verde);
  font-weight: 800;
  font-size: 14px;
  flex-shrink: 0;
  margin-top: 2px;
}

.hero-cta-box {
  background: var(--bg-blanco);
  border: 2px solid var(--borde);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-md);
}

.hero-pricing {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 20px;
}

.price-wrap {
  display: flex;
  align-items: baseline;
  color: var(--oxido);
  font-family: var(--font-serif);
  font-weight: 900;
}

.price-currency {
  font-size: 28px;
  margin-right: 2px;
}

.price-num {
  font-size: 56px;
  line-height: 1;
}

.price-cur-code {
  font-size: 16px;
  font-weight: 700;
  margin-left: 4px;
}

.price-details {
  display: flex;
  flex-direction: column;
}

.price-strike {
  font-size: 17px;
  color: var(--ink-light);
  text-decoration: line-through;
}

.price-save {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--verde);
}

.hero-guarantee-note {
  margin-top: 14px;
  font-size: 13.5px;
  color: var(--ink-muted);
  text-align: center;
}

/* VISUAL 3D EN HERO */
.book-card-stage {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

.hero-3d-book {
  width: 100%;
  max-width: 440px;
  height: auto;
  filter: drop-shadow(0 20px 30px rgba(10, 16, 22, 0.25));
  transition: transform 0.3s ease;
}

.hero-3d-book:hover {
  transform: translateY(-4px) scale(1.02);
}

.book-floating-badge {
  position: absolute;
  bottom: 24px;
  right: 20px;
  background: var(--acero);
  color: #ffffff;
  padding: 12px 18px;
  border-radius: var(--radius-md);
  border: 2px solid #dfa573;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  text-align: center;
}

.bf-val {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 800;
  color: #f7b28d;
}

.bf-lbl {
  font-size: 11.5px;
  font-weight: 600;
  color: #e2dbce;
}

/* ==========================================================================
   BARRA DE CONFIANZA Y MODELOS
   ========================================================================== */

.trust-bar {
  background: #ffffff;
  padding: 22px 0;
  border-bottom: 1px solid var(--borde);
}

.trust-bar-inner {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.tb-label {
  font-weight: 700;
  font-size: 14px;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.tb-models {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.model-tag {
  background: var(--bg-alt);
  color: var(--ink);
  font-size: 13.5px;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--borde);
}

/* ==========================================================================
   SECCIONES COMUNES
   ========================================================================== */

.sec {
  padding: 72px 0;
}

.sec-intro {
  margin-bottom: 48px;
}

.sec-kicker {
  display: inline-block;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--oxido);
  text-transform: uppercase;
  margin-bottom: 10px;
}

.sec-title {
  font-size: 36px;
  margin-bottom: 16px;
}

.sec-sub {
  font-size: 19.5px;
  color: var(--ink-soft);
  line-height: 1.6;
}

/* ==========================================================================
   SECCIÓN 2: EL PROBLEMA REAL
   ========================================================================== */

.problem-sec {
  background: var(--bg-blanco);
  border-bottom: 1px solid var(--borde);
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 44px;
}

.p-card {
  background: var(--bg-crema);
  border: 1px solid var(--borde);
  border-radius: var(--radius-md);
  padding: 30px 24px;
  transition: transform 0.2s;
}

.p-card:hover {
  transform: translateY(-3px);
  border-color: var(--borde-dark);
}

.p-icon {
  font-size: 36px;
  margin-bottom: 14px;
}

.p-card h3 {
  font-size: 22px;
  margin-bottom: 12px;
  color: var(--acero);
}

.p-card p {
  font-size: 16.5px;
  color: var(--ink-soft);
  line-height: 1.55;
}

.problem-banner {
  background: var(--acero);
  color: #ffffff;
  border-radius: var(--radius-lg);
  padding: 36px 42px;
  border-left: 8px solid var(--oxido);
}

.problem-banner h3 {
  color: #ffffff;
  font-size: 24px;
  margin-bottom: 12px;
}

.problem-banner p {
  color: #dfd7c8;
  font-size: 18px;
  line-height: 1.6;
}

/* ==========================================================================
   SECCIÓN 3: LA CARTA DEL VIEJO
   ========================================================================== */

.letter-sec {
  background: var(--bg-crema);
  border-bottom: 1px solid var(--borde);
}

.letter-wrap {
  max-width: 860px;
}

.letter-card {
  background: var(--bg-blanco);
  border: 1px solid var(--borde);
  border-radius: var(--radius-lg);
  padding: 44px 48px;
  box-shadow: var(--shadow-sm);
}

.letter-author {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-bottom: 30px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--borde-soft);
}

.letter-photo {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--oxido);
}

.letter-meta h3 {
  font-size: 22px;
  margin-bottom: 4px;
}

.letter-meta span {
  font-size: 14px;
  color: var(--ink-muted);
}

.letter-body {
  font-size: 19.5px;
  color: var(--ink-soft);
  line-height: 1.7;
}

.letter-body p {
  margin-bottom: 1.4rem;
}

.letter-sign {
  margin-top: 28px;
  color: var(--oxido);
  font-family: var(--font-serif);
  font-weight: 700;
}

/* ==========================================================================
   SECCIÓN 4: LAS 3 PARTES
   ========================================================================== */

.content-sec {
  background: var(--bg-blanco);
  border-bottom: 1px solid var(--borde);
}

.parts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.part-card {
  background: var(--bg-crema);
  border: 2px solid var(--borde);
  border-radius: var(--radius-lg);
  padding: 34px 26px;
  display: flex;
  flex-direction: column;
}

.part-header {
  margin-bottom: 22px;
  padding-bottom: 18px;
  border-bottom: 2px solid var(--borde);
}

.part-num {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--oxido);
  background: var(--bg-alt);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  display: inline-block;
  margin-bottom: 8px;
}

.part-header h3 {
  font-size: 23px;
  margin-bottom: 8px;
}

.part-desc {
  font-size: 15px;
  color: var(--ink-muted);
}

.part-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.part-list li {
  font-size: 16px;
  color: var(--ink-soft);
  line-height: 1.5;
  padding-left: 18px;
  position: relative;
}

.part-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--oxido);
  font-weight: 800;
}

.part-list b {
  color: var(--ink);
  display: block;
  margin-bottom: 2px;
}

/* ==========================================================================
   SECCIÓN 5: PÁGINAS DE MUESTRA
   ========================================================================== */

.samples-sec {
  background: var(--bg-crema);
  border-bottom: 1px solid var(--borde);
}

.samples-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.sample-box {
  background: var(--bg-blanco);
  border: 1px solid var(--borde);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s, box-shadow 0.2s;
}

.sample-box:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.sample-img-wrap {
  width: 100%;
  aspect-ratio: 1 / 1.35;
  background: #eae3d5;
  overflow: hidden;
  border-bottom: 1px solid var(--borde);
}

.sample-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  transition: transform 0.3s;
}

.sample-box:hover .sample-img {
  transform: scale(1.03);
}

.sample-caption {
  padding: 20px;
}

.sample-caption h4 {
  font-size: 18px;
  margin-bottom: 6px;
  color: var(--acero);
}

.sample-caption p {
  font-size: 14.5px;
  color: var(--ink-muted);
  line-height: 1.45;
}

/* ==========================================================================
   SECCIÓN 6: PARA QUIÉN ES
   ========================================================================== */

.fit-sec {
  background: var(--bg-blanco);
  border-bottom: 1px solid var(--borde);
}

.fit-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.fit-col {
  padding: 36px 32px;
  border-radius: var(--radius-lg);
}

.fit-yes {
  background: #f4faf6;
  border: 2px solid #b7e3ca;
}

.fit-no {
  background: #fdf5f5;
  border: 2px solid #f2cfcf;
}

.fit-badge {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 1px;
  margin-bottom: 22px;
  color: var(--verde);
}

.badge-no {
  color: #b82b2b;
}

.fit-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.fit-col li {
  font-size: 17px;
  line-height: 1.5;
  padding-left: 26px;
  position: relative;
  color: var(--ink-soft);
}

.fit-yes li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--verde);
  font-weight: 800;
}

.fit-no li::before {
  content: '✕';
  position: absolute;
  left: 0;
  color: #b82b2b;
  font-weight: 800;
}

/* ==========================================================================
   SECCIÓN 7: VALOR HONESTO
   ========================================================================== */

.value-sec {
  background: var(--bg-crema);
  border-bottom: 1px solid var(--borde);
}

.value-card {
  background: var(--acero);
  color: #ffffff;
  border-radius: var(--radius-lg);
  padding: 42px 48px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: center;
}

.value-text h3 {
  color: #ffffff;
  font-size: 28px;
  margin-bottom: 14px;
}

.value-text p {
  color: #dfd7c8;
  font-size: 18px;
  line-height: 1.6;
  margin-bottom: 12px;
}

.value-stat {
  background: rgba(255, 255, 255, 0.08);
  border: 2px solid var(--oxido);
  border-radius: var(--radius-md);
  padding: 28px 36px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.v-num {
  font-family: var(--font-serif);
  font-size: 58px;
  font-weight: 900;
  color: #f7b28d;
  line-height: 1;
}

.v-label {
  font-size: 13.5px;
  font-weight: 800;
  letter-spacing: 1.5px;
  color: #ffffff;
  margin-top: 4px;
}

.v-desc {
  font-size: 12px;
  color: #bfb5a3;
  margin-top: 6px;
}

/* ==========================================================================
   SECCIÓN 8: CAJA DE COMPRA (BUY CARD)
   ========================================================================== */

.buy-sec {
  background: #ffffff;
  border-bottom: 1px solid var(--borde);
}

.buy-wrap {
  max-width: 900px;
}

.buy-card {
  background: var(--bg-crema);
  border: 3px solid var(--borde-dark);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.buy-card-header {
  background: var(--acero);
  color: #ffffff;
  padding: 36px 40px;
  text-align: center;
}

.bch-kicker {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 2px;
  color: #f0a46f;
  text-transform: uppercase;
}

.bch-title {
  color: #ffffff;
  font-size: 34px;
  margin: 8px 0 10px;
}

.bch-sub {
  color: #d8cebe;
  font-size: 17.5px;
  max-width: 720px;
  margin: 0 auto;
}

.buy-card-body {
  padding: 36px 40px;
}

.buy-pricing-banner {
  background: #ffffff;
  border: 2px solid var(--oxido);
  border-radius: var(--radius-md);
  padding: 22px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
  flex-wrap: wrap;
  gap: 16px;
}

.bp-label {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 1.5px;
  color: var(--oxido);
  display: block;
  margin-bottom: 4px;
}

.bp-price-row {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.bp-currency {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 900;
  color: var(--oxido);
}

.bp-val {
  font-family: var(--font-serif);
  font-size: 52px;
  font-weight: 900;
  color: var(--oxido);
  line-height: 1;
}

.bp-code {
  font-size: 16px;
  font-weight: 700;
  color: var(--oxido);
  margin-right: 12px;
}

.bp-old {
  font-size: 18px;
  color: var(--ink-light);
  margin-right: 8px;
}

.bp-save {
  background: var(--verde-bg);
  color: var(--verde);
  font-size: 13.5px;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

.bp-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.bp-clock-lbl {
  font-size: 13px;
  color: var(--ink-muted);
  margin-bottom: 4px;
}

.bp-clock-val {
  font-family: var(--font-sans);
  font-size: 20px;
  font-weight: 800;
  color: var(--oxido);
  background: #fdf5f0;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid #f2c7af;
}

.buy-includes h4 {
  font-size: 20px;
  margin-bottom: 18px;
}

.bi-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-bottom: 34px;
}

.bi-item {
  background: #ffffff;
  border: 1px solid var(--borde);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.bi-icon {
  font-size: 28px;
  flex-shrink: 0;
}

.bi-item b {
  display: block;
  font-size: 16px;
  color: var(--ink);
  margin-bottom: 3px;
}

.bi-item span {
  font-size: 13.5px;
  color: var(--ink-muted);
  line-height: 1.4;
}

.buy-action-area {
  margin-bottom: 30px;
}

.trust-icons-row {
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.ti-item {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink-muted);
}

.guarantee-box {
  background: var(--bg-blanco);
  border: 1px solid var(--borde);
  border-radius: var(--radius-md);
  padding: 24px;
}

.gb-badge {
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--verde);
  margin-bottom: 8px;
}

.guarantee-box p {
  font-size: 15.5px;
  color: var(--ink-soft);
  line-height: 1.55;
}

.checkout-msg {
  background: #fff4e5;
  border: 1px solid #e0b07a;
  color: #7a3e08;
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  margin-top: 12px;
  font-size: 14.5px;
  text-align: center;
}

/* ==========================================================================
   SECCIÓN 9: FAQ
   ========================================================================== */

.faq-sec {
  background: var(--bg-blanco);
  border-bottom: 1px solid var(--borde);
}

.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-crema);
  border: 1px solid var(--borde);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-q {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  padding: 20px 24px;
  cursor: pointer;
  outline: none;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.faq-q::-webkit-details-marker {
  display: none;
}

.faq-q::after {
  content: '+';
  font-size: 24px;
  color: var(--oxido);
  font-weight: 700;
  transition: transform 0.2s;
}

.faq-item[open] .faq-q::after {
  content: '−';
}

.faq-a {
  padding: 0 24px 22px;
  font-size: 17.5px;
  color: var(--ink-soft);
  line-height: 1.6;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */

.foot {
  background: var(--acero-dark);
  color: #ffffff;
  padding: 56px 0 40px;
}

.foot-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-bottom: 26px;
}

.foot-brand img {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 2px solid var(--oxido);
}

.foot-brand span {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 1px;
}

.foot-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 22px;
  margin-bottom: 30px;
}

.foot-links a {
  color: #bfb5a3;
  text-decoration: none;
  font-size: 14.5px;
  transition: color 0.2s;
}

.foot-links a:hover {
  color: #ffffff;
}

.disclaimer-text {
  max-width: 820px;
  margin: 0 auto 28px;
  font-size: 12.5px;
  color: #8c9ba7;
  line-height: 1.6;
  text-align: center;
}

.foot-copy {
  text-align: center;
  font-size: 13.5px;
  color: #657582;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
}

/* ==========================================================================
   STICKY BARRA COMPRA MÓVIL
   ========================================================================== */

.sticky-buy {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: #ffffff;
  border-top: 2px solid var(--oxido);
  padding: 12px 20px;
  z-index: 999;
  box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.12);
  align-items: center;
  justify-content: space-between;
}

.sb-info {
  display: flex;
  flex-direction: column;
}

.sb-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 14px;
  color: var(--ink);
}

.sb-price {
  font-size: 15px;
}

.sb-price b {
  color: var(--oxido);
}

.sb-price s {
  color: var(--ink-light);
  font-size: 12.5px;
  margin-left: 4px;
}

/* ==========================================================================
   POP-UP PRUEBA SOCIAL (ESQUINA INFERIOR IZQUIERDA)
   ========================================================================== */

.purchase-popup {
  position: fixed;
  bottom: 24px;
  left: 24px;
  background: #ffffff;
  border: 1px solid var(--borde);
  border-left: 4px solid var(--oxido);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  box-shadow: 0 8px 24px rgba(10, 16, 22, 0.18);
  display: flex;
  align-items: center;
  gap: 14px;
  z-index: 1000;
  max-width: 360px;
  transform: translateY(120%);
  opacity: 0;
  transition: transform 0.45s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.45s ease;
  pointer-events: none;
}

.purchase-popup.show {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.popup-thumb img {
  width: 44px;
  height: 60px;
  object-fit: cover;
  border-radius: 4px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

.popup-details {
  display: flex;
  flex-direction: column;
}

.popup-time {
  font-size: 11px;
  color: var(--ink-light);
}

.popup-text {
  font-size: 13.5px;
  color: var(--ink);
  line-height: 1.35;
  margin: 2px 0 3px;
}

.popup-verified {
  font-size: 11.5px;
  font-weight: 700;
  color: var(--verde);
}

/* ==========================================================================
   PÁGINA DOWNLOAD.HTML
   ========================================================================== */

.download-page {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
}

.download-box {
  background: #ffffff;
  border: 2px solid var(--borde);
  border-radius: var(--radius-lg);
  max-width: 680px;
  width: 100%;
  padding: 44px 40px;
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.db-status-icon {
  font-size: 54px;
  margin-bottom: 16px;
}

.db-title {
  font-size: 32px;
  margin-bottom: 12px;
}

.db-sub {
  font-size: 18px;
  color: var(--ink-soft);
  margin-bottom: 30px;
}

.db-file-card {
  background: var(--bg-crema);
  border: 1px solid var(--borde);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  text-align: left;
  margin-bottom: 30px;
}

.db-file-card img {
  width: 70px;
  height: 95px;
  object-fit: cover;
  border-radius: 4px;
  box-shadow: var(--shadow-sm);
}

.db-file-info h4 {
  font-size: 18.5px;
  margin-bottom: 4px;
}

.db-file-info span {
  font-size: 14px;
  color: var(--ink-muted);
}

.db-actions {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* ==========================================================================
   SUPRESIÓN DE OVERLAYS DE NETLIFY
   ========================================================================== */
netlify-drawer,
[data-netlify-badge],
.netlify-badge,
#netlify-badge,
.netlify-hud,
iframe[src*="netlify"] {
  display: none !important;
  visibility: hidden !important;
  pointer-events: none !important;
}

/* ==========================================================================
   MEDIA QUERIES (RESPONSIVE)
   ========================================================================== */

@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .hero-visual {
    order: -1;
  }

  .hero-3d-book {
    max-width: 320px;
  }

  .problem-grid,
  .parts-grid,
  .samples-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .value-card {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .value-stat {
    width: 100%;
  }

  .bi-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 17px;
  }

  .head-nav {
    display: none;
  }

  .hero {
    padding: 36px 0 40px;
  }

  .hero-title {
    font-size: 32px;
  }

  .hero-sub {
    font-size: 18px;
  }

  .sec {
    padding: 54px 0;
  }

  .sec-title {
    font-size: 28px;
  }

  .fit-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .letter-card {
    padding: 28px 22px;
  }

  .letter-author {
    flex-direction: column;
    text-align: center;
  }

  .buy-card-header,
  .buy-card-body {
    padding: 28px 20px;
  }

  .bp-right {
    align-items: flex-start;
  }

  .sticky-buy {
    display: flex;
  }

  .purchase-popup {
    bottom: 84px;
    left: 12px;
    right: 12px;
    max-width: calc(100% - 24px);
  }
}