/* style.css */

/* ===========================
   Variables y base
   =========================== */

:root {
  --bg-main: #F4F7F5;
  --text-main: #333333;
  --accent-primary: #0A9396;
  --accent-secondary: #EE9B00;
  --accent-muted: #94D2BD;
  --border-soft: rgba(0, 0, 0, 0.06);
  --shadow-soft: 0 18px 40px rgba(15, 23, 42, 0.12);
}

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Roboto', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background:
    radial-gradient(circle at 0% 0%, rgba(10, 147, 150, 0.18), transparent 55%),
    radial-gradient(circle at 100% 100%, rgba(238, 155, 0, 0.16), transparent 55%),
    radial-gradient(circle at 0% 100%, rgba(0, 43, 51, 0.16), #F4F7F5);
  color: var(--text-main);
  line-height: 1.7;
}

/* Quita márgenes por defecto de headings y párrafos */
h1,
h2,
h3,
h4,
p {
  margin: 0;
}

img,
video {
  max-width: 100%;
  display: block;
  border-radius: 12px;
}

main {
  padding-block: 1.5rem 3rem;
}

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

a:hover {
  text-decoration: underline;
}

/* ===========================
   Layout general
   =========================== */

.container {
  max-width: 960px;
  margin: 2.25rem auto 2.75rem;
  padding: 1.9rem 1.6rem 2.7rem;
  background: rgba(244, 247, 245, 0.9);
  border-radius: 26px;
  box-shadow: 0 24px 50px rgba(15, 23, 42, 0.22);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid rgba(148, 210, 189, 0.55);
  position: relative;
  overflow: hidden;
}

.container.narrow {
  max-width: 780px;
}

.page-hero .container {
  margin-top: 6.5rem;
}

.section {
  margin-top: 3rem;
}

.section + .section {
  padding-top: 0;
}

/* ===========================
   Tipografía
   =========================== */

h1,
h2,
h3,
h4 {
  font-weight: 700;
  color: #12302E;
}

h1 {
  font-size: clamp(2rem, 1.6rem + 1.5vw, 2.6rem);
  letter-spacing: 0.02em;
}

h2 {
  font-size: clamp(1.5rem, 1.3rem + 0.7vw, 2rem);
}

h3 {
  font-size: 1.25rem;
}

p {
  font-size: 0.98rem;
}

.eyebrow {
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--accent-primary);
  margin-bottom: 0.4rem;
}

/* ===========================
   Header y navegación
   =========================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(22px);
  -webkit-backdrop-filter: blur(22px);
  background: linear-gradient(120deg, #022129 0%, #024552 40%, #0A9396 100%);
  border-bottom: 1px solid rgba(148, 210, 189, 0.55);
  box-shadow: 0 18px 40px rgba(3, 7, 18, 0.5);
}

.nav {
  max-width: 960px;
  margin: 0 auto;
  padding: 0.7rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo + icono IA */

.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 0.92rem;
  color: #FDFDFD;
  text-decoration: none;
  text-shadow: 0 0 18px rgba(148, 210, 189, 0.55);
}

.logo_AI {
  width: 28px;
  height: 28px;
  border-radius: 9px;
  object-fit: cover;
  flex-shrink: 0;
  box-shadow: 0 0 0 2px rgba(244, 247, 245, 0.35);
}

/* Links del menú */

.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 1.6rem;
  margin: 0;
  padding: 0;
}

.nav-links a {
  text-decoration: none;
  font-size: 0.95rem;
  color: #FDFDFD;
  font-weight: 500;
  position: relative;
  padding-block: 0.2rem;
  transition: color 0.2s ease-out;
}

.nav-links a[aria-current="page"] {
  color: #FFFAE5;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.25rem;
  height: 3px;
  border-radius: 999px;
  background: linear-gradient(90deg, #94D2BD, #EE9B00);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.22s ease-out;
}

.nav-links a:hover::after,
.nav-links a[aria-current="page"]::after {
  transform: scaleX(1);
}

/* Botón hamburguesa */

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem;
}

.nav-toggle .bar {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 999px;
  background-color: #E6FEFA;
  margin: 4px 0;
  transition: transform 0.2s ease-out, opacity 0.2s ease-out;
}

/* ===========================
   Hero
   =========================== */

.hero {
  margin-top: 6rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2.3fr);
  gap: 2.2rem;
  align-items: center;
}

.hero-text p {
  margin-top: 0.75rem;
}

.hero-text p + p {
  margin-top: 0.4rem;
}

.hero-actions {
  margin-top: 1.4rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero-media,
.media-block {
  background:
    radial-gradient(circle at 0% 0%, rgba(148, 210, 189, 0.24), transparent 55%),
    radial-gradient(circle at 100% 100%, rgba(238, 155, 0, 0.24), transparent 50%),
    rgba(255, 255, 255, 0.16);
  border-radius: 24px;
  padding: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.35);
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.28);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.hero-media img {
  width: 100%;
  height: auto;
  border-radius: 18px;
}

/* ===========================
   Secciones / tarjetas
   =========================== */

.section-intro {
  margin-bottom: 1.6rem;
}

.section-intro p {
  margin-top: 0.4rem;
}

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

.topic-card {
  position: relative;
  background: rgba(255, 255, 255, 0.9);
  border-radius: 20px;
  padding: 1.5rem 1.4rem 1.4rem;
  border: 1px solid rgba(148, 210, 189, 0.45);
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.18);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  overflow: hidden;
  transition: transform 0.25s ease-out, box-shadow 0.25s ease-out, border-color 0.25s ease-out;
}

.topic-card::before {
  content: '';
  position: absolute;
  inset: -40%;
  background:
    radial-gradient(circle at 0% 0%, rgba(10, 147, 150, 0.24), transparent 55%),
    radial-gradient(circle at 100% 100%, rgba(238, 155, 0, 0.22), transparent 50%);
  opacity: 0;
  transform: translate3d(-8%, -8%, 0);
  transition: opacity 0.35s ease-out, transform 0.35s ease-out;
  pointer-events: none;
}

.topic-card:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: 0 26px 60px rgba(15, 23, 42, 0.26);
  border-color: rgba(10, 147, 150, 0.9);
}

.topic-card:hover::before {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

.topic-image {
  border-radius: 16px;
  margin-bottom: 0.6rem;
  box-shadow: 0 14px 32px rgba(15, 23, 42, 0.25);
}

/* ===========================
   Botones
   =========================== */

.btn-primary,
.btn-secondary,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 1.1rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition:
    background-color 0.2s ease-out,
    color 0.2s ease-out,
    border-color 0.2s ease-out,
    box-shadow 0.2s ease-out,
    transform 0.15s ease-out;
}

.btn-primary {
  background: linear-gradient(135deg, #0A9396, #94D2BD);
  color: #F8FAF9;
  box-shadow: 0 14px 30px rgba(12, 94, 108, 0.7);
  border-color: rgba(148, 210, 189, 0.8);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 40px rgba(12, 94, 108, 0.9);
}

.btn-secondary {
  background-color: transparent;
  color: var(--accent-primary);
  border-color: rgba(10, 147, 150, 0.65);
}

.btn-secondary:hover {
  background-color: rgba(10, 147, 150, 0.06);
}

.btn-ghost {
  background-color: transparent;
  color: #0B3B3B;
  border-color: rgba(0, 0, 0, 0.18);
}

.btn-ghost:hover {
  background-color: rgba(0, 0, 0, 0.03);
}

/* ===========================
   Bloques de contenido
   =========================== */

.media-block + .media-block {
  margin-top: 1.5rem;
}

.media-block h3 {
  margin-bottom: 0.5rem;
}

.media-block p + p {
  margin-top: 0.4rem;
}

/* Video recomendado con link a YouTube */

.video-block {
  margin-top: 2rem;
}

.video-intro {
  margin-bottom: 1rem;
}

.video-link-card {
  border-radius: 22px;
  overflow: hidden;
  background: radial-gradient(circle at 0% 0%, rgba(15, 23, 42, 0.9), rgba(7, 15, 20, 1));
  box-shadow: 0 20px 48px rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(148, 210, 189, 0.4);
}

.video-link-card:hover {
  box-shadow: 0 26px 72px rgba(15, 23, 42, 1);
}

.video-link-card a {
  display: flex;
  flex-direction: column;
  color: inherit;
  text-decoration: none;
}

.video-link-text {
  display: block;
  width: 100%;
  padding: 0.75rem 1rem;
  color: #F4F7F5;
  font-weight: 500;
  text-align: center;
}

.video-link-card:hover .video-link-text {
  background-color: #0A9396;
}

/* ===========================
   Fuentes y enlaces de regreso
   =========================== */

.sources-list {
  margin-top: 1.25rem;
  padding-left: 1.2rem;
}

.sources-list li + li {
  margin-top: 0.6rem;
}

.source-note {
  margin-top: 1.5rem;
  font-size: 0.85rem;
  color: #4b5563;
}

.back-links {
  margin-top: 2rem;
  font-size: 0.9rem;
}

.text-link {
  color: var(--accent-primary);
  font-weight: 500;
}

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

/* ===========================
   Footer
   =========================== */

.site-footer {
  text-align: center;
  padding: 1rem 0 1.4rem;
  font-size: 0.82rem;
  color: #4b5563;
}

/* ===========================
   Responsive
   =========================== */

@media (max-width: 960px) {
  .nav {
    padding-inline: 1.25rem;
  }

  .container {
    margin-inline: 1rem;
  }

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

@media (max-width: 768px) {
  main {
    padding-top: 1rem;
  }

  .hero {
    margin-top: 5.2rem;
  }

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

  .hero-media {
    order: -1;
  }

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

  .nav-toggle {
    display: block;
  }

  .nav-links {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    margin: 0;
    padding: 0.8rem 1.25rem 1.25rem;
    flex-direction: column;
    gap: 0.75rem;
    background: rgba(1, 28, 34, 0.96);
    border-bottom: 1px solid rgba(148, 210, 189, 0.45);
    transform-origin: top;
    transform: scaleY(0.75);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.22s ease-out, transform 0.22s ease-out;
  }

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

@media (max-width: 480px) {
  .container {
    margin-inline: 0.75rem;
    padding-inline: 1.1rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
}