/* Estilos base. Modo claro/oscuro según la preferencia del sistema. */
:root {
  --bg: #ffffff;
  --text: #1a1a1a;
  --muted: #5c5c5c;
  --border: #e4e4e4;
  --surface: #f6f6f6;
  --accent: #2f5bd3;
  --accent-text: #ffffff;
  --radius: 10px;
  --max-width: 52rem;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111214;
    --text: #ececec;
    --muted: #a3a3a3;
    --border: #2a2c30;
    --surface: #1a1b1e;
    --accent: #7a9cff;
    --accent-text: #0b0d12;
  }
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.6;
}

a {
  color: var(--accent);
}

.skip-link {
  position: absolute;
  left: -999px;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

.site-header,
main,
.site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1rem;
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  padding-block: 1.25rem;
}

.site-header nav {
  display: flex;
  gap: 1rem;
}

.brand {
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
}

section {
  padding-block: 2.5rem;
}

.hero {
  padding-block: 4rem 3rem;
}

.eyebrow {
  margin: 0;
  color: var(--muted);
  font-size: 0.875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

h1 {
  margin: 0.5rem 0;
  font-size: clamp(2rem, 6vw, 3.25rem);
  line-height: 1.1;
}

.lead {
  color: var(--muted);
  font-size: 1.2rem;
}

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

.button {
  display: inline-block;
  padding: 0.7rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-weight: 600;
  text-decoration: none;
}

.button-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-text);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.card {
  padding: 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.card h3 {
  margin-top: 0;
}

.site-footer {
  padding-block: 2rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
}

.error-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}