/**
 * Layout: base temática del documento (html/body), estructura del header,
 * footer, contenedores y grillas. Estilos mobile-first — los ajustes por
 * breakpoint (sm/md/lg/xl) viven en responsive.css, no acá.
 */

/* ---------- Base del documento ---------- */

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-ink-900);
  background-image: var(--gradient-radial-brand);
  background-attachment: fixed;
  background-size: cover;
  color: var(--color-text);
  font-family: var(--font-body);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
}

section[id] {
  scroll-margin-top: var(--header-height, 90px);
}

::selection {
  background-color: color-mix(in srgb, var(--color-accent) 30%, transparent);
  color: var(--color-white);
}

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

::placeholder {
  color: var(--color-muted);
  opacity: 0.8;
}

/* ---------- Contenedores y ritmo vertical ---------- */

.container {
  width: 100%;
  margin-inline: auto;
  padding-inline: var(--space-5);
  max-width: var(--container-6xl);
}

.container--sm {
  max-width: var(--container-md);
}

.container--md {
  max-width: var(--container-4xl);
}

.container--lg {
  max-width: var(--container-5xl);
}

.section {
  padding-block: var(--space-20);
}

.section--sm {
  padding-block: var(--space-16);
}

.section--lg {
  padding-block: var(--space-24);
}

/* ---------- Grillas reutilizables ---------- */

.grid {
  display: grid;
  gap: var(--space-6);
}

.grid--2,
.grid--3 {
  grid-template-columns: minmax(0, 1fr);
}

.grid--centered {
  max-width: var(--container-2xl);
  margin-inline: auto;
}

/* ---------- Header ---------- */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.site-header--scrolled {
  background-color: color-mix(in srgb, var(--color-ink-950) 95%, transparent);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-lg);
}

.navbar {
  margin-inline: auto;
  display: flex;
  max-width: var(--container-6xl);
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-5);
}

.brand {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text);
}

.brand__logo {
  height: var(--space-14);
  width: auto;
  object-fit: contain;
  transition: transform var(--transition-base);
}

.brand:hover .brand__logo {
  transform: scale(1.05);
}

.brand__name {
  display: none;
  font-size: var(--text-lg);
  font-weight: var(--fw-bold);
  letter-spacing: 0.02em;
}

.nav-menu {
  position: absolute;
  left: 0;
  top: 100%;
  display: none;
  width: 100%;
  flex-direction: column;
  gap: var(--space-4);
  border-top: 1px solid color-mix(in srgb, var(--color-white) 5%, transparent);
  background-color: color-mix(in srgb, var(--color-ink-950) 98%, transparent);
  padding-block: var(--space-6);
  text-align: center;
  border-radius: 0 0 var(--radius-2xl) var(--radius-2xl);
  box-shadow: var(--shadow-lg);
  list-style: none;
}

.nav-menu.is-open {
  display: flex;
}

.nav-menu__item--cta {
  margin-top: var(--space-2);
}

/* ---------- Footer ---------- */

.site-footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-5);
  border-top: 1px solid color-mix(in srgb, var(--color-white) 5%, transparent);
  background-color: var(--color-ink-950);
  padding: var(--space-16) var(--space-5);
  text-align: center;
}

.site-footer__logo {
  width: 100%;
  max-width: 220px;
  object-fit: contain;
  transition: transform var(--transition-base);
}

.site-footer__logo:hover {
  transform: scale(1.03);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  column-gap: var(--space-6);
  row-gap: var(--space-2);
}

.footer-links a {
  font-size: var(--text-sm);
  color: var(--color-muted);
  transition: color var(--transition-base);
}

.footer-links a:hover {
  color: var(--color-accent);
}

.site-footer__tagline {
  max-width: var(--container-md);
  font-size: var(--text-sm);
  color: var(--color-muted);
}

.site-footer__copyright {
  font-size: var(--text-sm);
  color: var(--color-muted);
}