/* ============================================
   PORTAL DE CALIDAD - Tecnologías para Todos
   Design system: minimalista, SaaS, accesible
   ============================================ */

:root {
  /* Colores principales */
  --navy: #0B1F3B;
  --navy-light: #132a4a;
  --accent: #1E90FF;
  --accent-hover: #1a7ae6;
  --white: #FFFFFF;
  --gray-50: #F8FAFC;
  --gray-100: #F1F5F9;
  --gray-200: #E2E8F0;
  --gray-400: #94A3B8;
  --gray-600: #475569;
  --gray-800: #1E293B;
  --text: #0F172A;
  --text-muted: #64748B;

  /* Tipografía */
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --text-base: 1rem;
  --text-sm: 0.875rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;

  /* Espaciado */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Bordes */
  --radius: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --border: 1px solid var(--gray-200);

  /* Contenedor */
  --container: min(100% - 2rem, 1140px);
  --container-narrow: min(100% - 2rem, 720px);
}

/* Reset suave */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Contenedor */
.container {
  width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

/* ========== HEADER ========== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  color: var(--navy);
  text-decoration: none;
}

.logo-img {
  height: 44px;
  width: auto;
  object-fit: contain;
  display: block;
}

.logo:hover {
  text-decoration: none;
}

.nav-list {
  display: none;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--space-6);
}

.nav-list a {
  color: var(--text);
  font-weight: 500;
}

.nav-list a:hover {
  color: var(--accent);
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--navy);
  border-radius: var(--radius);
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
}

.nav.open .nav-list {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--white);
  padding: var(--space-4);
  border-bottom: var(--border);
  margin-top: 0;
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }

  .nav-list {
    display: flex;
  }
}

/* ========== BOTONES ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-6);
  font-family: var(--font);
  font-size: var(--text-base);
  font-weight: 600;
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.2s, color 0.2s, transform 0.15s;
}

.btn:hover {
  text-decoration: none;
}

.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--accent);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 2px solid var(--accent);
}

.btn-outline:hover {
  background: var(--accent);
  color: var(--white);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
}

.btn-hero {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
}

/* ========== HERO ========== */
.hero {
  padding: var(--space-12) 0 var(--space-16);
  background: linear-gradient(180deg, var(--gray-50) 0%, var(--white) 60%);
}

.hero-inner {
  display: grid;
  gap: var(--space-12);
  align-items: center;
}

.hero-content {
  max-width: 36rem;
}

.hero-headline {
  margin: 0 0 var(--space-4);
  font-size: clamp(2rem, 5vw, var(--text-5xl));
  font-weight: 700;
  line-height: var(--leading-tight);
  letter-spacing: -0.03em;
  color: var(--navy);
}

.hero-subheadline {
  margin: 0 0 var(--space-3);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--gray-800);
}

.hero-desc {
  margin: 0 0 var(--space-6);
  font-size: var(--text-lg);
  color: var(--text-muted);
  line-height: var(--leading-relaxed);
}

.hero-cta {
  margin-top: var(--space-6);
}

.hero-cta-note {
  margin: var(--space-3) 0 0;
  font-size: var(--text-sm);
  color: var(--text-muted);
}

/* Hero visual: red neuronal / chat */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 280px;
}

.hero-visual-inner {
  position: relative;
  width: 100%;
  max-width: 380px;
  aspect-ratio: 1;
}

.hero-samantha-logo {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 120px;
  max-width: 50%;
  height: auto;
  object-fit: contain;
  z-index: 2;
}

.neural-ring {
  position: absolute;
  inset: 10%;
  border: 2px solid var(--accent);
  border-radius: 50%;
  opacity: 0.4;
  animation: pulse-ring 4s ease-in-out infinite;
}

.ring-2 {
  inset: 25%;
  animation-delay: 1s;
  opacity: 0.25;
}

@keyframes pulse-ring {
  0%, 100% { transform: scale(1); opacity: 0.4; }
  50% { transform: scale(1.05); opacity: 0.6; }
}

.neural-dots {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 30%, var(--accent) 2px, transparent 2px),
              radial-gradient(circle at 70% 50%, var(--accent) 2px, transparent 2px),
              radial-gradient(circle at 50% 70%, var(--accent) 2px, transparent 2px);
  background-size: 60px 60px;
  opacity: 0.5;
}

.chat-mockup {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
  background: var(--white);
  border: var(--border);
  border-radius: var(--radius-xl);
  box-shadow: 0 4px 24px rgba(11, 31, 59, 0.06);
}

.chat-bubble {
  padding: var(--space-3) var(--space-4);
  background: var(--gray-100);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  color: var(--text);
  max-width: 85%;
}

.chat-bubble.user {
  align-self: flex-end;
  background: var(--accent);
  color: var(--white);
}

@media (min-width: 768px) {
  .hero-inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
  }

  .hero {
    padding: var(--space-16) 0 var(--space-24);
  }
}

/* ========== SECCIONES GENÉRICAS ========== */
.section {
  padding: var(--space-16) 0;
}

.section-about {
  background: var(--white);
}

.section-portales {
  background: var(--gray-50);
}

.section-apps {
  background: var(--white);
}

.section-ia {
  background: var(--gray-50);
}

.section-cta {
  background: var(--navy);
  color: var(--white);
}

.section-cta .section-title,
.section-cta .section-lead {
  color: var(--white);
}

.section-cta .section-lead {
  opacity: 0.9;
}

.section-cta .btn-primary {
  background: var(--white);
  color: var(--navy);
}

.section-cta .btn-primary:hover {
  background: var(--gray-100);
  color: var(--navy);
}

.section-title {
  margin: 0 0 var(--space-6);
  font-size: clamp(1.5rem, 4vw, var(--text-3xl));
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--navy);
  text-align: center;
}

.section-lead {
  margin: 0 auto var(--space-8);
  max-width: var(--container-narrow);
  font-size: var(--text-lg);
  color: var(--text-muted);
  text-align: center;
  line-height: var(--leading-relaxed);
}

/* ========== SECCIÓN 2 - TECNOLOGÍAS PARA TODOS ========== */
.about-grid {
  display: grid;
  gap: var(--space-10);
  max-width: 900px;
  margin: 0 auto;
}

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

.about-lead {
  margin: 0;
  font-size: var(--text-lg);
  color: var(--text-muted);
  line-height: var(--leading-relaxed);
}

.about-icons {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.about-icon-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-6);
  background: var(--white);
  border: var(--border);
  border-radius: var(--radius-lg);
  font-weight: 500;
  color: var(--text);
  transition: border-color 0.2s, color 0.2s;
}

.about-icon-card:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.about-icon {
  display: flex;
  width: 48px;
  height: 48px;
  color: var(--accent);
}

.about-icon svg {
  width: 100%;
  height: 100%;
}

@media (min-width: 640px) {
  .about-icons {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ========== SECCIÓN 3 - PORTALES EMPRESARIALES ========== */
.portales-grid {
  display: grid;
  gap: var(--space-6);
  max-width: 720px;
  margin: 0 auto;
}

@media (min-width: 640px) {
  .portales-grid {
    grid-template-columns: repeat(2, 1fr);
    max-width: 100%;
  }
}

.portal-card {
  background: var(--white);
  border: var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.portal-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 24px rgba(30, 144, 255, 0.08);
}

.portal-card-logo {
  width: 80px;
  height: 64px;
  margin-bottom: var(--space-4);
  background: var(--gray-100);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.portal-card-logo img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.portal-card-title {
  margin: 0 0 var(--space-2);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--navy);
}

.portal-card-desc {
  margin: 0 0 var(--space-5);
  font-size: var(--text-sm);
  color: var(--text-muted);
  flex-grow: 1;
}

/* ========== SECCIÓN 4 - APPS GRATUITAS ========== */
.apps-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 480px) {
  .apps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .apps-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.app-card {
  background: var(--white);
  border: var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.app-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(30, 144, 255, 0.06);
}

.app-icon {
  display: flex;
  width: 40px;
  height: 40px;
  margin-bottom: var(--space-3);
  color: var(--accent);
}

.app-icon svg {
  width: 100%;
  height: 100%;
}

.app-card-title {
  margin: 0 0 var(--space-2);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--navy);
}

.app-card-desc {
  margin: 0 0 var(--space-4);
  font-size: var(--text-sm);
  color: var(--text-muted);
  flex-grow: 1;
}

/* ========== SECCIÓN 5 - IA EMPRESARIAL ========== */
.ia-lead {
  margin-bottom: var(--space-8);
}

.ia-list {
  list-style: none;
  margin: 0 auto var(--space-8);
  padding: 0;
  max-width: 400px;
  display: grid;
  gap: var(--space-3);
}

.ia-list li {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-lg);
  color: var(--text);
}

.ia-list .check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--accent);
  color: var(--white);
  border-radius: 50%;
  font-size: var(--text-sm);
  font-weight: 700;
  flex-shrink: 0;
}

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

.ia-cta .btn {
  min-width: 260px;
}

/* ========== SECCIÓN 6 - CIERRE ========== */
.cta-inner {
  text-align: center;
  padding: var(--space-12) var(--space-4);
}

.cta-inner .section-title {
  margin-bottom: var(--space-4);
}

.cta-inner .section-lead {
  margin-bottom: var(--space-8);
  color: rgba(255, 255, 255, 0.9);
}

/* ========== FOOTER ========== */
.footer {
  background: var(--navy);
  color: var(--white);
  padding: var(--space-12) 0 var(--space-8);
}

.footer a {
  color: var(--white);
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
  color: var(--gray-200);
}

.footer-grid {
  display: grid;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

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

.footer-logo {
  font-weight: 700;
  font-size: var(--text-lg);
}

.footer-tagline {
  font-size: var(--text-sm);
  opacity: 0.8;
}

.footer-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer-social {
  display: flex;
  gap: var(--space-4);
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.1);
  transition: background 0.2s;
}

.social-link:hover {
  background: rgba(255, 255, 255, 0.2);
  text-decoration: none;
}

.social-link svg {
  width: 20px;
  height: 20px;
}

.footer-bottom {
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-sm);
  opacity: 0.9;
}

.footer-link {
  font-size: var(--text-sm);
}

.footer-copy {
  margin: 0;
}

@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: auto 1fr auto;
    align-items: start;
  }
}

/* Reducir movimiento para preferencia de usuario */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}