/* Variables CSS */
:root {
  /* Paleta basada en el logo - Modo claro */
  --color-primary: #00c9a7;      /* verde–turquesa brillante */
  --color-primary-dark: #00a389;
  --color-secondary: #0077b6;    /* azul medio */
  --color-dark: #0b1b2a;         /* azul muy oscuro */
  --color-bg: #f5f7fb;           /* fondo muy claro */
  --color-card: #ffffff;         /* tarjetas / bloques */
  --color-text: #222c35;         /* texto principal */
  --color-text-soft: #606a75;    /* texto secundario */
  --shadow-soft: 0 10px 25px rgba(0, 0, 0, 0.06);
  --radius-lg: 16px;
  --radius-md: 12px;
  --transition-fast: 0.2s ease-in-out;
  --container-width: 1120px;
}

/* Modo oscuro */
[data-theme="dark"] {
  --color-primary: #00c9a7;
  --color-primary-dark: #00e6c1;
  --color-secondary: #4da6cc;
  --color-dark: #e2edf8;
  --color-bg: #0a0f14;
  --color-card: #141d2b;
  --color-text: #e2edf8;
  --color-text-soft: #a9b8c9;
  --shadow-soft: 0 10px 25px rgba(0, 0, 0, 0.3);
}

/* Reset y base */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Open Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

img {
  max-width: 100%;
  display: block;
}

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

/* Layout base */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: 4rem 0;
}

h1, h2, h3, h4 {
  font-weight: 700;
  color: var(--color-dark);
}

/* ----------------------------------------------------
   LOADER CYTOS
------------------------------------------------------ */
#cytos-loader {
  position: fixed;
  inset: 0;
  background: linear-gradient(135deg, #021724, #012034);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 1;
  transition: opacity 0.8s ease-out, visibility 0.8s ease-out;
}

.cytos-loader-content {
  text-align: center;
}

.cytos-logo {
  width: 140px;
  animation: cytos-pulse 2s infinite ease-in-out;
}

.cytos-loading-text {
  margin-top: 1rem;
  font-family: 'Open Sans', sans-serif;
  color: #E2EDF8;
  font-size: 1rem;
  opacity: 0.8;
  letter-spacing: 0.08em;
}

/* Animación de pulso suave */
@keyframes cytos-pulse {
  0% { transform: scale(1); filter: drop-shadow(0 0 0px #00C9A7); }
  50% { transform: scale(1.08); filter: drop-shadow(0 0 8px #00C9A7); }
  100% { transform: scale(1); filter: drop-shadow(0 0 0px #00C9A7); }
}

/* Ocultar loader */
#cytos-loader.hide {
  opacity: 0;
  visibility: hidden;
}

/* Botón de cambio de tema flotante */
.theme-toggle {
  position: fixed;
  bottom: 20px;
  left: 20px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--color-card);
  border: 2px solid rgba(0, 201, 167, 0.3);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  font-size: 1.3rem;
  z-index: 1000;
  box-shadow: var(--shadow-soft);
}

.theme-toggle:hover {
  background: rgba(0, 201, 167, 0.1);
  border-color: var(--color-primary);
  transform: scale(1.05);
  box-shadow: 0 8px 25px rgba(0, 201, 167, 0.2);
}

.theme-toggle .icon {
  position: absolute;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.theme-toggle .sun-icon {
  opacity: 1;
  transform: rotate(0deg);
}

.theme-toggle .moon-icon {
  opacity: 0;
  transform: rotate(-90deg);
}

[data-theme="dark"] .theme-toggle .sun-icon {
  opacity: 0;
  transform: rotate(90deg);
}

[data-theme="dark"] .theme-toggle .moon-icon {
  opacity: 1;
  transform: rotate(0deg);
}

/* Header */
header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(245, 247, 251, 0.96);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.04);
  transition: background var(--transition-fast), box-shadow var(--transition-fast);
}

[data-theme="dark"] header {
  background: rgba(10, 15, 20, 0.96);
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.2);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-wrap img {
  height: 42px;
  width: auto;
}

.logo-text {
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-secondary);
}

nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  font-size: 0.95rem;
  font-weight: 600;
}

nav a {
  position: relative;
  color: var(--color-text-soft);
}

nav a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -0.3rem;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  transition: width var(--transition-fast);
}

nav a:hover {
  color: var(--color-dark);
}

nav a:hover::after {
  width: 100%;
}

.nav-cta {
  padding: 0.5rem 1rem;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #ffffff;
  font-size: 0.9rem;
  box-shadow: var(--shadow-soft);
}

.nav-cta:hover {
  filter: brightness(1.05);
}

/* Botón hamburguesa (móvil) */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--color-dark);
  border-radius: 999px;
}

/* Hero */
.hero {
  padding: 4rem 0 3rem;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: 2.5rem;
  align-items: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  background: rgba(0, 201, 167, 0.12);
  color: var(--color-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--color-primary);
}

.hero-title {
  font-size: clamp(2.1rem, 3vw, 2.8rem);
  margin-bottom: 1rem;
}

.hero-subtitle {
  font-size: 1rem;
  color: var(--color-text-soft);
  margin-bottom: 1.6rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.8rem 1.5rem;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #ffffff;
  box-shadow: var(--shadow-soft);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 28px rgba(0, 0, 0, 0.1);
}

.btn-outline {
  background: transparent;
  color: var(--color-secondary);
  border: 1px solid rgba(0, 119, 182, 0.3);
}

.btn-outline:hover {
  background: rgba(0, 119, 182, 0.06);
}

.hero-meta {
  font-size: 0.85rem;
  color: var(--color-text-soft);
}

.hero-meta span {
  color: var(--color-primary-dark);
  font-weight: 600;
}

.hero-logo-card {
  justify-self: center;
  background: radial-gradient(circle at top, rgba(0, 201, 167, 0.16), transparent 60%),
              radial-gradient(circle at bottom, rgba(0, 119, 182, 0.12), transparent 60%);
  padding: 1.8rem 1.5rem;
  border-radius: 24px;
  box-shadow: var(--shadow-soft);
  text-align: center;
}

.hero-logo-card img {
  margin: 0 auto 1rem;
  max-width: 220px;
}

.hero-logo-caption {
  font-size: 1.7rem;
  color: var(--color-text-soft);
}

.hero-logo-caption2 {
  font-size: 0.9rem;
  color: var(--color-text-soft);
}

/* Secciones genéricas */
.section-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.section-kicker {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-primary-dark);
  margin-bottom: 0.5rem;
  font-weight: 700;
}

.section-title {
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
}

.section-subtitle {
  max-width: 640px;
  margin: 0.25rem auto 0;
  font-size: 0.98rem;
  color: var(--color-text-soft);
}

/* Rutas de aprendizaje */
.tracks-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
}

.track-card {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  padding: 1.4rem 1.4rem 1.3rem;
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.track-label {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-primary-dark);
}

.track-title {
  font-size: 1.1rem;
}

.track-desc {
  font-size: 0.9rem;
  color: var(--color-text-soft);
}

.track-list {
  list-style: none;
  font-size: 0.9rem;
  color: var(--color-text-soft);
  margin-top: 0.25rem;
}

.track-list li::before {
  content: "• ";
  color: var(--color-primary);
}

.track-link {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-secondary);
}

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

/* Metodología */
.method-section {
  background: radial-gradient(circle at top left, rgba(0, 201, 167, 0.16), transparent 60%),
              radial-gradient(circle at bottom right, rgba(0, 119, 182, 0.13), transparent 60%),
              linear-gradient(145deg, #021724, #021520);
  color: #ffffff;
}

.method-section .section-title,
.method-section .section-subtitle {
  color: #ffffff;
}

.method-steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.2rem;
}

.method-card {
  background: rgba(3, 27, 48, 0.85);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.1rem 1rem;
  border: 1px solid rgba(0, 201, 167, 0.22);
}

.method-step-number {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(0, 201, 167, 0.9);
  margin-bottom: 0.3rem;
}

.method-card h3 {
  font-size: 1rem;
  color: #ffffff;
  margin-bottom: 0.3rem;
}

.method-card p {
  font-size: 0.88rem;
  color: #c6d2dd;
}

/* Quiénes somos */
.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 2rem;
  align-items: flex-start;
}

.about-text p + p {
  margin-top: 0.9rem;
}

.about-card {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.7rem;
  box-shadow: var(--shadow-soft);
}

.about-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.4rem;
}

.about-card p {
  font-size: 0.95rem;
  color: var(--color-text-soft);
}

.about-card + .about-card {
  margin-top: 1.2rem;
}

/* Comunidad */
.community-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  gap: 2rem;
  align-items: center;
}

.community-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.tag {
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  font-size: 0.85rem;
  background: rgba(0, 201, 167, 0.08);
  color: var(--color-secondary);
  border: 1px solid rgba(0, 201, 167, 0.25);
}

/* Testimonios */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
}

.testimonial-card {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  padding: 1.3rem 1.4rem;
  box-shadow: var(--shadow-soft);
  font-size: 0.9rem;
  color: var(--color-text-soft);
}

.testimonial-name {
  font-weight: 700;
  color: var(--color-dark);
  margin-top: 0.7rem;
}

.testimonial-role {
  font-size: 0.85rem;
  color: var(--color-primary-dark);
}

/* CTA final */
.cta-section {
  padding: 3.5rem 0;
  background: radial-gradient(circle at top, rgba(0, 201, 167, 0.18), transparent 65%),
              radial-gradient(circle at bottom, rgba(0, 119, 182, 0.2), transparent 65%),
              linear-gradient(135deg, #021724, #012034);
  color: #ffffff;
  text-align: center;
}

.cta-title {
  font-size: 2rem;
  margin-bottom: 0.75rem;
  color: #ffffff;
}

.cta-text {
  max-width: 620px;
  margin: 0 auto 1.8rem;
  font-size: 0.98rem;
  color: #e2edf8;
}

.cta-actions {
  display: flex;
  justify-content: center;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.btn-cta-outline {
  border: 1px solid rgba(255, 255, 255, 0.4);
  background: transparent;
  color: #ffffff;
}

.btn-cta-outline:hover {
  background: rgba(0, 0, 0, 0.15);
}

/* Footer */
footer {
  background: #010b13;
  color: #8d9bab;
  padding: 2.5rem 0 1.5rem;
  font-size: 0.88rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1.3fr 1.3fr;
  gap: 2rem;
  margin-bottom: 1.5rem;
}

.footer-logo img {
  height: 32px;
  margin-bottom: 0.7rem;
}

.footer-title {
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

.footer-links {
  list-style: none;
}

.footer-links li + li {
  margin-top: 0.3rem;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 1rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.8rem;
}

.footer-bottom a {
  color: #a9b8c9;
}

.footer-bottom a:hover {
  color: #ffffff;
}

/* Responsivo */
@media (max-width: 960px) {
  .theme-toggle {
    bottom: 15px;
    left: 15px;
    width: 45px;
    height: 45px;
    font-size: 1.2rem;
  }

  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    text-align: left;
  }

  .hero-logo-card {
    max-width: 380px;
    width: 100%;
  }

  .about-grid,
  .community-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .tracks-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .method-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .testimonials-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  nav {
    position: absolute;
    inset: 72px 0 auto 0;
    background: rgba(245, 247, 251, 0.98);
    flex-direction: column;
    padding: 1rem 1.5rem 1.5rem;
    gap: 1rem;
    box-shadow: 0 12px 20px rgba(0, 0, 0, 0.06);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
  }

  [data-theme="dark"] nav {
    background: rgba(10, 15, 20, 0.98);
    box-shadow: 0 12px 20px rgba(0, 0, 0, 0.3);
  }

  nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-toggle {
    display: flex;
  }

  .header-inner {
    position: relative;
  }
}

@media (max-width: 640px) {
  section {
    padding: 3rem 0;
  }

  .theme-toggle {
    bottom: 10px;
    left: 10px;
    width: 40px;
    height: 40px;
    font-size: 1.1rem;
  }

  .tracks-grid,
  .method-steps,
  .testimonials-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero {
    padding-top: 3rem;
  }
}