/* ==========================================================================
   base.css — Design tokens, reset y estilos globales
   ========================================================================== */

/* ---- Design tokens ---- */
:root {
  /* Marca */
  --color-primary: #0f172a;
  --color-primary-soft: #1e293b;
  --color-accent: #991b1b;
  --color-accent-dark: #7f1d1d;
  --color-accent-soft: #fee2e2;

  /* Neutros */
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-text: #1f2937;
  --color-text-muted: #4b5563;
  --color-text-light: #cbd5e1;
  --color-border: #e2e8f0;

  /* Fondos oscuros compartidos (hero y footer) */
  --gradient-dark: linear-gradient(135deg, #0f172a 0%, #292524 55%, #1c1917 100%);

  /* Tipografía */
  --font-sans: 'Inter', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, Arial, sans-serif;
  --text-h1: clamp(2.25rem, 4.5vw + 1rem, 3.75rem);
  --text-h2: clamp(1.75rem, 2.5vw + 1rem, 2.375rem);
  --text-lead: clamp(1.0625rem, 0.5vw + 1rem, 1.25rem);

  /* Layout */
  --container-max: 80rem;
  --header-height: 4rem;

  /* Elevación */
  --shadow-sm: 0 1px 2px rgb(15 23 42 / 0.06);
  --shadow-md: 0 4px 12px rgb(15 23 42 / 0.08);
  --shadow-lg: 0 12px 32px rgb(15 23 42 / 0.14);

  /* Radios y transiciones */
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

/* ---- Reset ---- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
}

html {
  scroll-behavior: smooth;
  /* Evita que el header fijo tape los destinos de las anclas */
  scroll-padding-top: calc(var(--header-height) + 1rem);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
  padding: 0;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

h1, h2, h3, h4 {
  line-height: 1.2;
  color: var(--color-primary);
}

/* ---- Accesibilidad ---- */
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 100;
  padding: 0.75rem 1.25rem;
  background: var(--color-primary);
  color: #fff;
  font-weight: 600;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.skip-link:focus {
  top: 0;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ---- Layout ---- */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 1rem;
}

@media (min-width: 640px) {
  .container {
    padding-inline: 1.5rem;
  }
}

@media (min-width: 1024px) {
  .container {
    padding-inline: 2rem;
  }
}

.section {
  padding-block: 5rem;
}

@media (min-width: 1024px) {
  .section {
    padding-block: 7rem;
  }
}

.section--alt {
  background-color: var(--color-bg-alt);
}

/* ---- Iconos (sprite SVG) ---- */
.icon {
  width: 1.5rem;
  height: 1.5rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  flex-shrink: 0;
}

.icon--sm {
  width: 1.125rem;
  height: 1.125rem;
  stroke-width: 2;
}

/* ---- Animación de aparición ----
   Solo se oculta el contenido cuando hay JavaScript disponible;
   sin JS todo permanece visible. */
.js .fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.js .fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .js .fade-in {
    opacity: 1;
    transform: none;
  }
}