re:root {
  --bg: #ffffff;
  --text: #0f172a;
  --text-soft: #64748b;
  --border: #e5e7eb;
  --soft: #f8fafc;
  --white: #ffffff;

  --app1: #4f46e5;
  --app2: #9333ea;

  --tutorias: #16a34a;
  --catedras: #2563eb;
  --congresos: #f97316;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(1140px, calc(100% - 32px));
  margin: 0 auto;
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(229, 231, 235, 0.8);
}

.nav-inner {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.logo {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--text);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-menu a {
  color: var(--text-soft);
  font-weight: 600;
  font-size: 15px;
  transition: 0.25s ease;
  position: relative;
}

.nav-menu a:hover {
  color: var(--app1);
}

.nav-menu a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -8px;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--app1), var(--app2));
  transition: 0.25s ease;
}

.nav-menu a:hover::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border-radius: 14px;
  font-weight: 700;
  font-size: 15px;
  transition: 0.28s ease;
  border: 1px solid transparent;
  cursor: pointer;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: linear-gradient(90deg, var(--app1), var(--app2));
  color: #fff;
  box-shadow: 0 12px 28px rgba(79, 70, 229, 0.22);
}

.btn-primary:hover {
  box-shadow: 0 18px 38px rgba(79, 70, 229, 0.28);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.8);
  color: var(--text);
  border-color: var(--border);
}

.btn-secondary:hover {
  background: #f9fafb;
}

.btn-orange {
  background: linear-gradient(90deg, #f97316, #fb923c);
  color: #fff;
  box-shadow: 0 10px 24px rgba(249, 115, 22, 0.22);
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 104px 0 82px;
  background:
    radial-gradient(circle at top left, rgba(79, 70, 229, 0.12), transparent 34%),
    radial-gradient(circle at top right, rgba(249, 115, 22, 0.12), transparent 28%),
    linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
}

.hero::before {
  content: "";
  position: absolute;
  top: -120px;
  left: 50%;
  transform: translateX(-50%);
  width: 760px;
  height: 760px;
  background: radial-gradient(circle, rgba(147, 51, 234, 0.06), transparent 60%);
  pointer-events: none;
}

.hero-small {
  padding: 88px 0 62px;
}

.hero-inner {
  position: relative;
  text-align: center;
  z-index: 2;
}

.hero-badges {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 22px;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid var(--border);
  color: var(--text-soft);
  font-size: 13px;
  font-weight: 700;
  box-shadow: 0 6px 20px rgba(15, 23, 42, 0.04);
}

.orange-badge {
  border-color: #fed7aa;
  color: #c2410c;
  background: #fff7ed;
}

.hero h1 {
  margin: 0;
  font-size: clamp(42px, 6vw, 78px);
  line-height: 0.98;
  letter-spacing: -0.055em;
  font-weight: 800;
  background: linear-gradient(90deg, #0f172a 8%, #4f46e5 58%, #9333ea 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.congress-hero h1 {
  background: linear-gradient(90deg, #0f172a 15%, #f97316 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-text {
  width: min(780px, 100%);
  margin: 24px auto 0;
  font-size: 18px;
  color: var(--text-soft);
}

.hero-buttons {
  margin-top: 32px;
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-mini-stats {
  margin-top: 36px;
  display: flex;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
}

.mini-stat {
  min-width: 180px;
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: 0 10px 26px rgba(15, 23, 42, 0.05);
}

.mini-stat strong {
  display: block;
  font-size: 24px;
  color: var(--text);
}

.mini-stat span {
  display: block;
  margin-top: 4px;
  color: var(--text-soft);
  font-size: 14px;
}

.section {
  padding: 86px 0;
}

.section-soft {
  background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
}

.section-head {
  text-align: center;
  width: min(760px, 100%);
  margin: 0 auto 46px;
}

.section-kicker {
  display: inline-block;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.18em;
  color: var(--app1);
  margin-bottom: 10px;
}

.orange-text {
  color: var(--congresos);
}

.section-head h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 50px);
  letter-spacing: -0.045em;
  line-height: 1.03;
}

.section-head p {
  margin: 16px auto 0;
  color: var(--text-soft);
  font-size: 17px;
}

.cards-grid {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card {
  position: relative;
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 24px;
  box-shadow: 0 12px 34px rgba(15, 23, 42, 0.05);
  transition: 0.28s ease;
  backdrop-filter: blur(6px);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 22px 46px rgba(15, 23, 42, 0.10);
}

.card-top-line {
  position: absolute;
  top: 0;
  left: 0;
  height: 5px;
  width: 100%;
  border-radius: 24px 24px 0 0;
}

.app-line {
  background: linear-gradient(90deg, var(--app1), var(--app2));
}

.tutorias-line {
  background: var(--tutorias);
}

.catedras-line {
  background: var(--catedras);
}

.congresos-line {
  background: linear-gradient(90deg, #f97316, #fb923c);
}

.product-icon,
.audience-icon {
  width: 58px;
  height: 58px;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: 18px;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.4);
}

.app-icon {
  background: rgba(79, 70, 229, 0.12);
}

.tutorias-icon {
  background: rgba(22, 163, 74, 0.12);
}

.catedras-icon {
  background: rgba(37, 99, 235, 0.12);
}

.congresos-icon {
  background: rgba(249, 115, 22, 0.14);
}

.product-card h3,
.congress-card-large h3,
.audience-card h3,
.testimonial-card strong {
  margin: 0 0 10px;
  font-size: 22px;
  letter-spacing: -0.03em;
}

.product-card p,
.congress-card-large p,
.step-card p,
.cta-box p,
.audience-card p,
.testimonial-card p {
  color: var(--text-soft);
  margin: 0;
}

.text-link {
  display: inline-block;
  margin-top: 18px;
  font-weight: 700;
  color: var(--app1);
}

.text-link:hover {
  text-decoration: underline;
}

.audience-grid {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.audience-card {
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 24px;
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.05);
  transition: 0.28s ease;
}

.audience-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.09);
}

.steps-grid {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.step-card {
  background: rgba(255,255,255,0.94);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 24px;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.04);
  transition: 0.28s ease;
}

.step-card:hover {
  transform: translateY(-4px);
}

.step-number {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(79, 70, 229, 0.12);
  color: var(--app1);
  font-weight: 800;
  margin-bottom: 18px;
}

.step-card h3 {
  margin: 0 0 10px;
  font-size: 22px;
}

.testimonials-grid {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.testimonial-card {
  position: relative;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 28px 24px 24px;
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.05);
  transition: 0.28s ease;
}

.testimonial-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 42px rgba(15, 23, 42, 0.09);
}

.quote-mark {
  font-size: 48px;
  line-height: 1;
  color: rgba(79, 70, 229, 0.22);
  font-weight: 800;
  margin-bottom: 8px;
}

.testimonial-meta {
  margin-top: 18px;
}

.testimonial-meta strong {
  display: block;
}

.testimonial-meta span {
  color: var(--text-soft);
  font-size: 14px;
}

.cta-section {
  padding-top: 12px;
}

.cta-box {
  border: 1px solid var(--border);
  border-radius: 30px;
  background:
    radial-gradient(circle at left top, rgba(79, 70, 229, 0.08), transparent 28%),
    radial-gradient(circle at right bottom, rgba(249, 115, 22, 0.09), transparent 25%),
    rgba(255,255,255,0.94);
  padding: 36px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  box-shadow: 0 14px 34px rgba(15, 23, 42, 0.05);
}

.cta-box h2 {
  margin: 0 0 10px;
  font-size: clamp(28px, 4vw, 42px);
  letter-spacing: -0.04em;
}

.cta-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.footer {
  border-top: 1px solid var(--border);
  padding: 22px 0;
  background: rgba(255,255,255,0.9);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  color: var(--text-soft);
  font-size: 14px;
}

.footer-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.footer-links a:hover {
  color: var(--app1);
}

.congress-main-grid {
  grid-template-columns: 2fr 1fr 1fr;
  align-items: stretch;
}

.congress-card-large {
  min-height: 100%;
}

.congress-links-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 22px;
}

.mini-link-card {
  border: 1px solid #fed7aa;
  background: linear-gradient(180deg, #fff7ed 0%, #ffffff 100%);
  border-radius: 18px;
  padding: 16px;
  transition: 0.25s ease;
}

.mini-link-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 26px rgba(249, 115, 22, 0.14);
}

.mini-icon {
  display: block;
  font-size: 22px;
  margin-bottom: 10px;
}

.mini-title {
  display: block;
  font-weight: 800;
  color: #9a3412;
  margin-bottom: 6px;
}

.mini-sub {
  display: block;
  color: #7c2d12;
  font-size: 14px;
}

.reveal {
  opacity: 1;
  transform: none;
  transition: none;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 1100px) {
  .cards-grid,
  .steps-grid,
  .audience-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .testimonials-grid,
  .congress-main-grid {
    grid-template-columns: 1fr;
  }

  .cta-box {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 760px) {
  .nav-inner {
    flex-wrap: wrap;
    justify-content: center;
    padding: 14px 0;
  }

  .nav-menu {
    order: 3;
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
    gap: 14px;
    padding-bottom: 6px;
  }

  .nav-actions {
    width: 100%;
    justify-content: center;
  }

  .hero {
    padding: 74px 0 52px;
  }

  .hero-text {
    font-size: 16px;
  }

  .cards-grid,
  .steps-grid,
  .audience-grid,
  .testimonials-grid,
  .congress-main-grid,
  .congress-links-grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 62px 0;
  }

  .cta-box {
    padding: 26px;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}