/* ============================================================
   FRECUENTIA — LANDING PAGE
   Design system: Studio Noir
   ============================================================ */

/* --- FUENTES --- */
@font-face {
  font-family: 'General Sans';
  src: url('/assets/fonts/GeneralSans-Semibold.woff2') format('woff2');
  font-weight: 600;
  font-display: swap;
}
@font-face {
  font-family: 'General Sans';
  src: url('/assets/fonts/GeneralSans-Bold.woff2') format('woff2');
  font-weight: 700;
  font-display: swap;
}
@font-face {
  font-family: 'Satoshi';
  src: url('/assets/fonts/Satoshi-Regular.woff2') format('woff2');
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: 'Satoshi';
  src: url('/assets/fonts/Satoshi-Medium.woff2') format('woff2');
  font-weight: 500;
  font-display: swap;
}

/* --- VARIABLES --- */
:root {
  --bg-primary: #07070A;
  --bg-secondary: #0E0E12;
  --bg-card: #141418;
  --bg-card-hover: #1A1A1F;

  --text-primary: #F0F0F0;
  --text-secondary: #8A8A95;
  --text-tertiary: #55555F;

  --accent: #10B981;
  --accent-hover: #0EA472;
  --accent-glow: rgba(16, 185, 129, 0.15);
  --accent-subtle: rgba(16, 185, 129, 0.08);

  --border: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.12);

  --danger: #EF4444;
  --warning: #F59E0B;

  --font-display: 'General Sans', sans-serif;
  --font-body: 'Satoshi', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --section-padding: 140px;
  --section-padding-mobile: 80px;
  --content-max-width: 1140px;
  --content-padding: 24px;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --transition: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 600ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- RESET --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
}

/* Noise texture sutil */
body::after {
  content: '';
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; }

/* --- LAYOUT --- */
section {
  padding: var(--section-padding) 0;
  position: relative;
}
.container {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 var(--content-padding);
}
.section-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: 16px;
}
.section-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.6;
}

/* --- NAVBAR --- */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 18px 0;
  transition: var(--transition);
  background: transparent;
}
nav.scrolled {
  background: rgba(7, 7, 10, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}
.nav-inner {
  display: flex;
  align-items: center;
  gap: 32px;
}
.logo {
  margin-right: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}
.logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}
.logo-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
}
.nav-links a:hover {
  color: var(--text-primary);
}
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  font-weight: 500;
}
.lang-option {
  color: var(--text-tertiary);
  text-decoration: none;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.lang-option:hover {
  color: var(--text-secondary);
}
.lang-option.active {
  color: var(--text-primary);
  background: var(--accent-subtle);
}
.lang-separator {
  color: var(--text-tertiary);
  font-size: 11px;
}
.btn-nav {
  font-size: 14px;
  padding: 10px 20px;
}
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 4px;
}
.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: var(--transition);
}
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(7, 7, 10, 0.97);
  z-index: 999;
  padding: 80px 24px 40px;
  flex-direction: column;
  gap: 24px;
}
.mobile-menu.open {
  display: flex;
}
.mobile-menu a {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: var(--text-secondary);
  transition: color var(--transition);
}
.mobile-menu a:hover {
  color: var(--text-primary);
}
.mobile-menu .mobile-cta {
  margin-top: 16px;
}
.mobile-lang {
  display: flex;
  gap: 12px;
  margin-top: 8px;
}
.mobile-lang a {
  font-size: 16px;
  font-weight: 600;
}

/* --- HERO --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  background-image:
    linear-gradient(rgba(255,255,255,0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.018) 1px, transparent 1px);
  background-size: 60px 60px;
}
.hero::before {
  content: '';
  position: absolute;
  top: 35%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 700px;
  height: 500px;
  background: radial-gradient(ellipse, var(--accent-glow), transparent 70%);
  pointer-events: none;
  z-index: 0;
}
.hero .container {
  position: relative;
  z-index: 1;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-subtle);
  border: 1px solid rgba(16, 185, 129, 0.2);
  color: var(--accent);
  font-size: 13px;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 28px;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(36px, 5.5vw, 72px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 24px;
  max-width: 820px;
}
.hero h1 em {
  font-style: normal;
  color: var(--accent);
}
.hero-subtitle {
  font-size: clamp(16px, 2vw, 20px);
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.6;
  margin-bottom: 40px;
}
.hero-ctas {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}
.hero-footnote {
  font-size: 13px;
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.hero-footnote span {
  display: flex;
  align-items: center;
  gap: 6px;
}
.hero-footnote span::before {
  content: '·';
  color: var(--accent);
  font-size: 16px;
  line-height: 1;
}
.hero-footnote span:first-child::before {
  display: none;
}

/* --- PROBLEMA --- */
.problema {
  background: var(--bg-secondary);
}
.problema-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 64px;
}
.problema-card {
  padding: 36px 32px;
}
.problema-icon {
  width: 44px;
  height: 44px;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.2);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 20px;
}
.problema-card h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.3;
}
.problema-card p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- CÓMO FUNCIONA --- */
.como-funciona .section-header {
  margin-bottom: 72px;
}
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  position: relative;
}
.steps::before {
  content: '';
  position: absolute;
  top: 28px;
  left: calc(12.5% + 20px);
  right: calc(12.5% + 20px);
  height: 1px;
  background: var(--border);
}
.step {
  padding: 0 20px;
  text-align: center;
}
.step-number {
  width: 56px;
  height: 56px;
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  background: var(--bg-secondary);
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--accent);
  position: relative;
  z-index: 1;
}
.step h3 {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.step p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}
.como-funciona-cta {
  text-align: center;
  margin-top: 64px;
}

/* --- PRODUCTOS --- */
.productos {
  background: var(--bg-secondary);
}
.productos .section-header {
  margin-bottom: 64px;
}
.productos-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.producto-card {
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.producto-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-subtle);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}
.producto-card h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
}
.producto-specs {
  font-size: 13px;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  line-height: 1.8;
}
.producto-uso {
  font-size: 14px;
  color: var(--text-secondary);
  padding-top: 8px;
  border-top: 1px solid var(--border);
}
.producto-uso strong {
  color: var(--text-primary);
  font-weight: 500;
}
.producto-cta-note {
  text-align: center;
  margin-top: 40px;
  font-size: 15px;
  color: var(--text-secondary);
}
.producto-cta-note a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition);
}
.producto-cta-note a:hover {
  color: var(--accent-hover);
}

/* --- ANTES Y DESPUÉS --- */
.antes-despues .section-header {
  margin-bottom: 56px;
}
.chart-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  margin-top: 32px;
}
.chart-description {
  font-size: 15px;
  color: var(--text-secondary);
  margin-top: 32px;
  line-height: 1.7;
  max-width: 680px;
}

/* --- POR QUÉ FRECUENTIA --- */
.por-que {
  background: var(--bg-secondary);
}
.por-que .section-header {
  margin-bottom: 64px;
}
.por-que-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.por-que-block {
  padding: 32px;
}
.por-que-block-icon {
  font-size: 28px;
  margin-bottom: 16px;
  line-height: 1;
}
.por-que-block h3 {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
}
.por-que-block p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- FAQ --- */
.faq .section-header {
  margin-bottom: 56px;
  max-width: 680px;
}
.faq-list {
  max-width: 800px;
}
.faq-item {
  border-bottom: 1px solid var(--border);
}
.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px 0;
  background: none;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  gap: 16px;
  transition: color var(--transition);
}
.faq-question:hover {
  color: var(--accent);
}
.faq-icon {
  transition: transform 0.3s ease;
  color: var(--text-tertiary);
  flex-shrink: 0;
}
.faq-item.open .faq-icon {
  transform: rotate(45deg);
  color: var(--accent);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding-bottom: 0;
}
.faq-item.open .faq-answer {
  max-height: 400px;
  padding-bottom: 24px;
}
.faq-answer p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.75;
}

/* --- SOCIAL PROOF --- */
.social-proof {
  background: var(--bg-secondary);
}
.social-proof .section-header {
  margin-bottom: 56px;
}
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.testimonial-card {
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.testimonial-stars {
  color: var(--warning);
  font-size: 14px;
  letter-spacing: 2px;
}
.testimonial-card blockquote {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.75;
  font-style: normal;
  flex: 1;
}
.testimonial-author {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.testimonial-name {
  font-weight: 600;
  font-size: 14px;
  color: var(--text-primary);
}
.testimonial-meta {
  font-size: 13px;
  color: var(--text-tertiary);
}

/* --- CTA FINAL --- */
.cta-final {
  text-align: center;
  padding: var(--section-padding) 0;
}
.cta-final .section-title {
  max-width: 640px;
  margin: 0 auto 16px;
}
.cta-final .section-subtitle {
  margin: 0 auto 40px;
  max-width: 520px;
  text-align: center;
}

/* --- FOOTER --- */
footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 64px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand p {
  font-size: 14px;
  color: var(--text-tertiary);
  margin-top: 12px;
  max-width: 240px;
  line-height: 1.6;
}
.footer-col h4 {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-col ul li a {
  font-size: 14px;
  color: var(--text-tertiary);
  transition: color var(--transition);
}
.footer-col ul li a:hover {
  color: var(--text-secondary);
}
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.footer-bottom p {
  font-size: 13px;
  color: var(--text-tertiary);
}

/* --- STICKY CTA MOBILE --- */
.sticky-cta {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 12px 16px;
  background: rgba(7, 7, 10, 0.93);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--border);
  z-index: 998;
  transform: translateY(100%);
  transition: transform 0.3s ease;
  display: none;
}
.sticky-cta.visible {
  transform: translateY(0);
}
.sticky-cta .btn-primary {
  width: 100%;
  justify-content: center;
}

/* --- RESPONSIVE --- */
@media (max-width: 1024px) {
  .steps {
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
  }
  .steps::before { display: none; }
  .por-que-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  section { padding: var(--section-padding-mobile) 0; }

  .nav-links,
  .btn-nav { display: none; }
  .lang-switcher { display: none; }
  .menu-toggle { display: flex; }
  .sticky-cta { display: block; }

  .problema-grid,
  .productos-grid,
  .testimonials-grid {
    grid-template-columns: 1fr;
  }

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

  .por-que-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .hero-ctas { flex-direction: column; align-items: flex-start; }
  .hero h1 { font-size: clamp(32px, 8vw, 48px); }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 30px; }
  .chart-wrapper { padding: 24px 16px; }
}