/*
  FYC Marketing Interactivo
  Hoja de estilos principal
  Este CSS define una paleta minimalista, tipografía legible y componentes reutilizables
  priorizando accesibilidad, rendimiento y escalabilidad.
*/

/* Variables de color y espaciado */
:root {
  --color-primary: #0a3d62;
  --color-secondary: #1e5ba3;
  --color-accent: #0068bd;
  --color-gray-light: #f5f7fa;
  --color-gray: #e5e9ef;
  --color-dark: #333333;
  --container-width: 1200px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell,
    "Open Sans", "Helvetica Neue", sans-serif;
  --transition-speed: 0.3s;
}

/* Reset básico */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-gray-light);
  color: var(--color-dark);
  line-height: 1.6;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-speed) ease;
}

a:hover,
a:focus {
  color: var(--color-accent);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Contenedor centralizado */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding: 0 1rem;
}

/* Encabezado y navegación */
header {
  background-color: #ffffff;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.logo {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.5px;
}

nav ul {
  list-style: none;
  display: flex;
  align-items: center;
}

nav li {
  margin-left: 1.5rem;
}

nav a {
  font-weight: 600;
  color: var(--color-dark);
}

nav a:focus,
nav a:hover {
  color: var(--color-accent);
}

/* Navegación móvil */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
}

@media (max-width: 768px) {
  nav ul {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: #ffffff;
    width: 200px;
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    display: none;
  }

  nav ul.open {
    display: flex;
  }

  nav li {
    margin-left: 0;
    margin-bottom: 0.75rem;
  }

  .nav-toggle {
    display: block;
  }
}

/* Sección hero */
.hero {
  background-color: var(--color-primary);
  color: #ffffff;
  padding: 4rem 0;
  text-align: center;
  background-image: linear-gradient(
    135deg,
    rgba(0, 64, 128, 0.8) 0%,
    rgba(0, 128, 192, 0.8) 100%
  );
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  font-weight: 700;
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  font-weight: 600;
  transition: background-color var(--transition-speed) ease;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #ffffff;
}

.btn-primary:hover,
.btn-primary:focus {
  background-color: var(--color-secondary);
}

.btn-outline {
  border: 2px solid #ffffff;
  color: #ffffff;
  background-color: transparent;
}

.btn-outline:hover,
.btn-outline:focus {
  background-color: #ffffff;
  color: var(--color-primary);
}

/* Secciones genéricas */
section {
  padding: 3rem 0;
}

section h2 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  color: var(--color-primary);
  text-align: center;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.card {
  background-color: #ffffff;
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  transition: transform var(--transition-speed) ease;
}

.card:hover,
.card:focus-within {
  transform: translateY(-4px);
}

.card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  color: var(--color-primary);
}

.card p {
  font-size: 1rem;
  color: var(--color-dark);
}

/* Sección de tablas / formularios */
form {
  max-width: 600px;
  margin: 0 auto;
  background-color: #ffffff;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

input,
textarea,
select {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--color-gray);
  border-radius: 4px;
  margin-bottom: 1rem;
  font-size: 1rem;
  line-height: 1.4;
}

input:focus,
textarea:focus,
select:focus {
  border-color: var(--color-accent);
  outline: none;
  box-shadow: 0 0 0 3px rgba(0, 104, 189, 0.2);
}

.form-footer {
  text-align: right;
}

small {
  display: block;
  font-size: 0.875rem;
  color: #666666;
  margin-top: -0.75rem;
  margin-bottom: 1rem;
}

/* Pie de página */
footer {
  background-color: #ffffff;
  border-top: 1px solid var(--color-gray);
  padding: 2rem 0;
  color: var(--color-dark);
  font-size: 0.875rem;
}

footer .footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
}

footer h4 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
  color: var(--color-primary);
}

footer a {
  color: var(--color-dark);
  font-size: 0.875rem;
}

footer a:hover,
footer a:focus {
  color: var(--color-accent);
}

/* Utilidades */
.text-center {
  text-align: center;
}

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 2rem; }

/* Accesibilidad */
[aria-invalid="true"] {
  border-color: #d9534f;
}

[aria-invalid="true"]:focus {
  box-shadow: 0 0 0 3px rgba(217, 83, 79, 0.3);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}