/* ============================================================
   mariosergio.co — Sistema de diseño v1.0
   Autor: Mario Sergio Gómez Rueda
   Estrategia: minimalismo editorial académico.
   Serif (Fraunces) para autoridad + Sans (Inter) para claridad.
   Paleta sobria con un único acento (teal) usado con disciplina.
   ============================================================ */

/* -----------------------------------------------------------
   1. TOKENS DE DISEÑO (variables CSS)
   Centralizar aquí facilita una futura migración a Next.js/WP.
   ----------------------------------------------------------- */
:root {
  /* Paleta */
  --color-ink:        #0F2A43;  /* azul profundo: autoridad, finanzas */
  --color-ink-soft:   #1B3A57;
  --color-accent:     #2C7A7B;  /* teal: datos e innovación (uso disciplinado) */
  --color-accent-dk:  #226364;
  --color-paper:      #FAF8F4;  /* marfil cálido: premium, no blanco frío */
  --color-paper-alt:  #F2EEE6;
  --color-text:       #2D3748;  /* gris carbón para cuerpo */
  --color-text-soft:  #5A6675;
  --color-line:       #E4DED3;  /* líneas finas */
  --color-white:      #FFFFFF;

  /* Tipografía */
  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
  --font-body:    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  /* Escala tipográfica modular (1.250 — tercera mayor) */
  --fs-xs:   0.78rem;
  --fs-sm:   0.9rem;
  --fs-base: 1rem;
  --fs-md:   1.18rem;
  --fs-lg:   1.5rem;
  --fs-xl:   2rem;
  --fs-2xl:  2.75rem;
  --fs-3xl:  3.75rem;
  --fs-hero: clamp(2.6rem, 6vw, 5rem);

  /* Espaciado (sistema base 8) */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4.5rem;
  --space-7: 7rem;

  /* Otros */
  --radius:   4px;
  --radius-lg: 10px;
  --max-width: 1180px;
  --shadow-sm: 0 1px 3px rgba(15, 42, 67, 0.06);
  --shadow-md: 0 10px 40px rgba(15, 42, 67, 0.08);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* -----------------------------------------------------------
   2. RESET Y BASE
   ----------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--transition); }
ul { list-style: none; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.15;
  color: var(--color-ink);
  letter-spacing: -0.01em;
}

/* Respeta preferencia de movimiento reducido */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* -----------------------------------------------------------
   3. UTILIDADES DE LAYOUT
   ----------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

.section { padding: var(--space-7) 0; }
.section--alt { background: var(--color-paper-alt); }
.section--ink { background: var(--color-ink); color: var(--color-paper); }
.section--ink h2, .section--ink h3 { color: var(--color-white); }

.eyebrow {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}
.section--ink .eyebrow { color: #6FB7B8; }

.section-title { font-size: var(--fs-2xl); margin-bottom: var(--space-2); }
.section-lead {
  font-size: var(--fs-md);
  color: var(--color-text-soft);
  max-width: 60ch;
  margin-bottom: var(--space-5);
}
.section--ink .section-lead { color: #B9C7D4; }

/* -----------------------------------------------------------
   4. BOTONES Y CTAs
   ----------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--fs-sm);
  padding: 0.85rem 1.6rem;
  border-radius: var(--radius);
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
}
.btn--primary { background: var(--color-accent); color: var(--color-white); }
.btn--primary:hover { background: var(--color-accent-dk); transform: translateY(-2px); }
.btn--ghost { background: transparent; border-color: currentColor; color: var(--color-ink); }
.btn--ghost:hover { background: var(--color-ink); color: var(--color-paper); }
.btn--light { background: var(--color-paper); color: var(--color-ink); }
.btn--light:hover { background: var(--color-white); transform: translateY(-2px); }

.link-arrow {
  font-weight: 600;
  color: var(--color-accent);
  font-size: var(--fs-sm);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.link-arrow:hover { gap: 0.7rem; color: var(--color-accent-dk); }

/* -----------------------------------------------------------
   5. HEADER / NAVEGACIÓN
   ----------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 248, 244, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.nav__brand {
  font-family: var(--font-display);
  font-size: var(--fs-md);
  font-weight: 600;
  color: var(--color-ink);
  letter-spacing: -0.02em;
}
.nav__brand span { color: var(--color-accent); }
.nav__menu { display: flex; gap: var(--space-4); align-items: center; }
.nav__link {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-text);
  position: relative;
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0; bottom: -6px;
  width: 0; height: 2px;
  background: var(--color-accent);
  transition: width var(--transition);
}
.nav__link:hover::after,
.nav__link[aria-current="page"]::after { width: 100%; }
.nav__link:hover { color: var(--color-ink); }

.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 32px; height: 32px;
}
.nav__toggle span {
  display: block;
  width: 24px; height: 2px;
  background: var(--color-ink);
  margin: 5px auto;
  transition: var(--transition);
}

/* -----------------------------------------------------------
   6. HERO — la tesis del sitio
   "Tres mundos que convergen" como elemento de firma
   ----------------------------------------------------------- */
.hero { padding: var(--space-7) 0 var(--space-6); overflow: hidden; }
.hero__grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--space-6);
  align-items: center;
}
.hero__title {
  font-size: var(--fs-hero);
  font-weight: 400;
  margin-bottom: var(--space-3);
}
.hero__title em {
  font-style: italic;
  color: var(--color-accent);
}
.hero__lead {
  font-size: var(--fs-md);
  color: var(--color-text-soft);
  max-width: 48ch;
  margin-bottom: var(--space-4);
}
.hero__actions { display: flex; gap: var(--space-2); flex-wrap: wrap; }
.hero__roles {
  margin-top: var(--space-5);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-3);
  font-size: var(--fs-sm);
  color: var(--color-text-soft);
}
.hero__roles span { display: inline-flex; align-items: center; gap: 0.5rem; }
.hero__roles span::before {
  content: ""; width: 6px; height: 6px;
  background: var(--color-accent); border-radius: 50%;
}

/* Retrato profesional */
.hero__portrait {
  position: relative;
}
.hero__portrait img {
  border-radius: var(--radius-lg);
  aspect-ratio: 4/5;
  object-fit: cover;
  box-shadow: var(--shadow-md);
}
.hero__portrait::before {
  content: "";
  position: absolute;
  inset: -16px -16px auto auto;
  width: 60%; height: 60%;
  border: 1.5px solid var(--color-accent);
  border-radius: var(--radius-lg);
  z-index: -1;
}
/* Marcador de posición si aún no hay foto */
.portrait-placeholder {
  aspect-ratio: 4/5;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--color-ink), var(--color-ink-soft));
  display: flex; align-items: center; justify-content: center;
  color: var(--color-paper);
  font-family: var(--font-display);
  font-size: var(--fs-3xl);
  box-shadow: var(--shadow-md);
}

/* -----------------------------------------------------------
   7. CONVERGENCIA — elemento de firma (tres pilares)
   ----------------------------------------------------------- */
.pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
.pillar {
  padding: var(--space-4);
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  transition: transform var(--transition), box-shadow var(--transition);
}
.pillar:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.pillar__icon { color: var(--color-accent); margin-bottom: var(--space-2); }
.pillar__num {
  font-family: var(--font-display);
  font-size: var(--fs-sm);
  color: var(--color-text-soft);
  display: block;
  margin-bottom: var(--space-1);
}
.pillar h3 { font-size: var(--fs-lg); margin-bottom: var(--space-1); }
.pillar p { font-size: var(--fs-sm); color: var(--color-text-soft); }

/* -----------------------------------------------------------
   8. MÉTRICAS
   ----------------------------------------------------------- */
.metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-4); }
.metric { text-align: center; }
.metric__value {
  font-family: var(--font-display);
  font-size: var(--fs-3xl);
  font-weight: 500;
  color: var(--color-accent);
  line-height: 1;
}
.section--ink .metric__value { color: #6FB7B8; }
.metric__label {
  font-size: var(--fs-sm);
  color: var(--color-text-soft);
  margin-top: var(--space-1);
}
.section--ink .metric__label { color: #B9C7D4; }

/* -----------------------------------------------------------
   9. TARJETAS (publicaciones, recursos, blog)
   ----------------------------------------------------------- */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
.card-grid--2 { grid-template-columns: repeat(2, 1fr); }
.card {
  display: flex;
  flex-direction: column;
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.card__body { padding: var(--space-3); display: flex; flex-direction: column; flex: 1; }
.card__tag {
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-1);
}
.card h3 { font-size: var(--fs-md); margin-bottom: var(--space-1); }
.card p { font-size: var(--fs-sm); color: var(--color-text-soft); margin-bottom: var(--space-2); }
.card__meta {
  margin-top: auto;
  font-size: var(--fs-xs);
  color: var(--color-text-soft);
  display: flex; justify-content: space-between; align-items: center;
}

/* -----------------------------------------------------------
   10. CTA FINAL
   ----------------------------------------------------------- */
.cta-band { text-align: center; }
.cta-band h2 { font-size: var(--fs-2xl); margin-bottom: var(--space-2); }
.cta-band p { color: #B9C7D4; max-width: 50ch; margin: 0 auto var(--space-4); }

/* -----------------------------------------------------------
   11. FOOTER
   ----------------------------------------------------------- */
.site-footer {
  background: var(--color-ink);
  color: var(--color-paper);
  padding: var(--space-6) 0 var(--space-4);
}
.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}
.footer__brand { font-family: var(--font-display); font-size: var(--fs-lg); margin-bottom: var(--space-2); }
.footer__brand span { color: #6FB7B8; }
.footer p { font-size: var(--fs-sm); color: #B9C7D4; max-width: 36ch; }
.footer h4 {
  font-family: var(--font-body);
  font-size: var(--fs-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #6FB7B8;
  margin-bottom: var(--space-2);
}
.footer ul li { margin-bottom: var(--space-1); }
.footer ul a { font-size: var(--fs-sm); color: #D5DEE6; }
.footer ul a:hover { color: var(--color-white); }
.footer__bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: var(--space-3);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: var(--space-2);
  font-size: var(--fs-xs); color: #8FA0B0;
}
.footer__social { display: flex; gap: var(--space-2); }
.footer__social a { color: #B9C7D4; }
.footer__social a:hover { color: var(--color-white); }

/* -----------------------------------------------------------
   12. PÁGINAS INTERNAS — encabezado y contenido
   ----------------------------------------------------------- */
.page-head { padding: var(--space-6) 0 var(--space-5); border-bottom: 1px solid var(--color-line); }
.page-head h1 { font-size: var(--fs-3xl); font-weight: 400; margin-bottom: var(--space-2); }
.page-head p { font-size: var(--fs-md); color: var(--color-text-soft); max-width: 60ch; }

.prose { max-width: 70ch; }
.prose p { margin-bottom: var(--space-3); }
.prose h2 { font-size: var(--fs-xl); margin: var(--space-5) 0 var(--space-2); }
.prose h3 { font-size: var(--fs-lg); margin: var(--space-4) 0 var(--space-1); }

/* Línea de tiempo (Sobre mí) */
.timeline { border-left: 2px solid var(--color-line); padding-left: var(--space-4); }
.timeline__item { position: relative; padding-bottom: var(--space-4); }
.timeline__item::before {
  content: ""; position: absolute; left: calc(-1 * var(--space-4) - 7px); top: 4px;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--color-paper); border: 2px solid var(--color-accent);
}
.timeline__year { font-family: var(--font-display); color: var(--color-accent); font-size: var(--fs-md); }
.timeline__item h3 { font-size: var(--fs-md); margin: var(--space-1) 0; }

/* Lista de credenciales */
.creds { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-2) var(--space-4); }
.cred { display: flex; gap: var(--space-2); padding: var(--space-2) 0; border-bottom: 1px solid var(--color-line); }
.cred__icon { color: var(--color-accent); flex-shrink: 0; }
.cred strong { display: block; color: var(--color-ink); font-family: var(--font-display); }
.cred span { font-size: var(--fs-sm); color: var(--color-text-soft); }

/* Cursos (Docencia) */
.course { display: grid; grid-template-columns: auto 1fr; gap: var(--space-3); padding: var(--space-3) 0; border-bottom: 1px solid var(--color-line); }
.course__index { font-family: var(--font-display); font-size: var(--fs-xl); color: var(--color-line); }
.course h3 { font-size: var(--fs-lg); margin-bottom: var(--space-1); }
.course p { color: var(--color-text-soft); font-size: var(--fs-sm); }

/* Formulario de contacto */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-6); }
.form-group { margin-bottom: var(--space-3); }
.form-group label { display: block; font-size: var(--fs-sm); font-weight: 600; margin-bottom: var(--space-1); color: var(--color-ink); }
.form-group input,
.form-group textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: var(--fs-base);
  padding: 0.8rem 1rem;
  border: 1.5px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-white);
  transition: border-color var(--transition);
}
.form-group input:focus,
.form-group textarea:focus { outline: none; border-color: var(--color-accent); }
.form-note { font-size: var(--fs-sm); color: var(--color-text-soft); }
.contact-detail { display: flex; gap: var(--space-2); margin-bottom: var(--space-3); }
.contact-detail__icon { color: var(--color-accent); }

/* -----------------------------------------------------------
   13. ACCESIBILIDAD — foco visible
   ----------------------------------------------------------- */
:focus-visible { outline: 3px solid var(--color-accent); outline-offset: 3px; border-radius: 2px; }
.skip-link {
  position: absolute; left: -999px;
  background: var(--color-ink); color: var(--color-white);
  padding: var(--space-2); z-index: 999;
}
.skip-link:focus { left: var(--space-2); top: var(--space-2); }

/* -----------------------------------------------------------
   14. ANIMACIÓN DE ENTRADA (revelado al hacer scroll)
   ----------------------------------------------------------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

/* -----------------------------------------------------------
   15. RESPONSIVE
   ----------------------------------------------------------- */
@media (max-width: 1024px) {
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .metrics { grid-template-columns: repeat(2, 1fr); gap: var(--space-5) var(--space-4); }
}

@media (max-width: 768px) {
  :root { --space-7: 4.5rem; --space-6: 3.5rem; }
  .hero__grid { grid-template-columns: 1fr; gap: var(--space-5); }
  .hero__portrait { order: -1; max-width: 320px; }
  .pillars { grid-template-columns: 1fr; }
  .card-grid, .card-grid--2 { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: var(--space-5); }
  .creds { grid-template-columns: 1fr; }

  /* Menú móvil */
  .nav__toggle { display: block; }
  .nav__menu {
    position: fixed;
    inset: 72px 0 auto 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--color-paper);
    border-bottom: 1px solid var(--color-line);
    padding: var(--space-2) var(--space-3);
    transform: translateY(-120%);
    transition: transform var(--transition);
    box-shadow: var(--shadow-md);
  }
  .nav__menu.is-open { transform: translateY(0); }
  .nav__menu li { width: 100%; }
  .nav__link { display: block; padding: var(--space-2) 0; width: 100%; border-bottom: 1px solid var(--color-line); }
  .nav__menu .btn { margin-top: var(--space-2); }
}

@media (max-width: 480px) {
  .metrics { grid-template-columns: 1fr; }
  .page-head h1 { font-size: var(--fs-2xl); }
}