/* ==================================================
   Variables globales y reset
   ================================================== */
:root {
  --primary-color: #58c2e7;
  --bg-color: #ffffff;
  --text-color: #213547;
  --header-bg: #f9f9f9;
  --card-bg: #f9f9f9;
  --border-color: #e0e0e0;
  --hover-bg: #70d2f0;
  --hover-text: #333333;
  --spacing-unit: 8px;
  --border-radius: 8px;

  font-family: Inter, system-ui, Avenir, Helvetica, Arial, sans-serif;
  line-height: 1.5;
  font-weight: 400;
  color-scheme: light; /* eliminado "only" (no válido) */
}

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

html,
body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-color);
  color: var(--text-color);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

#root {
  width: 100%;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ==================================================
   Layout principal
   ================================================== */
.App {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--bg-color);
}

/* ==================================================
   Header / navegación
   ================================================== */
.app-header {
  background-color: var(--header-bg);
  padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 3);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.app-header h1 {
  margin: 0;
  font-size: 1.8rem;
  color: var(--primary-color);
}

.app-header nav {
  display: flex;
  gap: calc(var(--spacing-unit) * 2);
  align-items: center;
}

.nav-link,
.app-header nav a,
.app-header nav button {
  color: var(--text-color);
  text-decoration: none;
  font-size: 1rem;
  padding: calc(var(--spacing-unit) * 0.75) 0;
  border: none;
  background: none;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color 0.3s, border-color 0.3s;
}

.nav-link:hover,
.app-header nav a:hover,
.app-header nav button:hover {
  color: var(--primary-color);
  border-bottom-color: var(--primary-color);
}

.nav-link:focus-visible,
.app-header nav a:focus-visible,
.app-header nav button:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* ==================================================
   Contenido principal
   ================================================== */
.app-main {
  flex: 1 0 auto;
  padding: calc(var(--spacing-unit) * 4);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

/* ==================================================
   Página de inicio
   ================================================== */
.inicio-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: calc(var(--spacing-unit) * 4);
}

.inicio-logo-img {
  width: 350px;
  max-width: 90%;
  height: auto;
}

.inicio-frase {
  font-size: clamp(1.8rem, 5vw, 2.5rem);
  font-weight: 300;
  color: var(--text-color);
  max-width: 600px;
  margin: 0;
}

.boton-entrar {
  background-color: var(--text-color);
  color: var(--bg-color);
  border: 2px solid var(--text-color);
  padding: 12px 40px;
  font-size: 1.1rem;
  border-radius: 50px;
  cursor: pointer;
  transition: background-color 0.3s, color 0.3s;
}

.boton-entrar:hover,
.boton-entrar:focus-visible {
  background-color: var(--bg-color);
  color: var(--text-color);
}

.boton-entrar:active {
  transform: scale(0.98);
}

/* ==================================================
   Página de categorías
   ================================================== */
.categorias-container {
  width: 100%;
  max-width: 1200px;
}

.categorias-container h2 {
  font-size: 2.2rem;
  margin-bottom: calc(var(--spacing-unit) * 1.5);
}

.categorias-container p {
  font-size: 1.1rem;
  color: #666;
  margin-bottom: calc(var(--spacing-unit) * 4);
}

.categorias-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
  gap: calc(var(--spacing-unit) * 3);
  width: 100%;
}

.categoria-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: calc(var(--spacing-unit) * 3);
  cursor: pointer;
  transition: transform 0.3s, box-shadow 0.3s;
  text-align: left;
  display: flex;
  flex-direction: column;
}

.categoria-card:hover,
.categoria-card:focus-visible {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
}

.categoria-card:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

.categoria-icono {
  color: var(--primary-color);
  margin-bottom: calc(var(--spacing-unit) * 1.5);
}

.categoria-card h3 {
  margin: 0 0 calc(var(--spacing-unit) * 0.75);
  font-size: 1.5rem;
}

.categoria-card p {
  font-size: 1rem;
  color: #666;
  margin: 0;
}

/* ==================================================
   Modales
   ================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.6);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.modal-content {
  background: var(--bg-color);
  padding: calc(var(--spacing-unit) * 3);
  border-radius: 12px;
  width: 90%;
  max-width: 450px;
  position: relative;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.modal-close {
  position: absolute;
  top: calc(var(--spacing-unit) * 2);
  right: calc(var(--spacing-unit) * 2);
  background: none;
  border: none;
  font-size: 1.8rem;
  cursor: pointer;
  color: #888;
}

.modal-tabs {
  display: flex;
  border-bottom: 1px solid #eee;
  margin-bottom: calc(var(--spacing-unit) * 2);
}

.modal-tabs button {
  flex: 1;
  padding: calc(var(--spacing-unit) * 1.5);
  border: none;
  background: none;
  cursor: pointer;
  font-size: 1.1rem;
  color: #aaa;
  border-bottom: 3px solid transparent;
}

.modal-tabs button.active {
  color: var(--text-color);
  border-bottom-color: var(--primary-color);
}

.modal-form {
  display: flex;
  flex-direction: column;
  gap: calc(var(--spacing-unit) * 1.5);
}

.modal-form h3 {
  margin-top: 0;
  text-align: center;
}

.modal-form input {
  padding: calc(var(--spacing-unit) * 1.5);
  border: 1px solid #ccc;
  border-radius: var(--border-radius);
  font-size: 1rem;
}

.modal-submit-button {
  padding: calc(var(--spacing-unit) * 1.5);
  border: none;
  border-radius: var(--border-radius);
  background-color: var(--primary-color);
  color: #fff;
  font-size: 1.1rem;
  cursor: pointer;
  margin-top: calc(var(--spacing-unit) * 1.5);
  transition: background-color 0.3s;
}

.modal-submit-button:hover,
.modal-submit-button:focus-visible {
  background-color: var(--hover-bg);
}

/* ==================================================
   Banner de cookies
   ================================================== */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--text-color);
  color: #fff;
  padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 3);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: calc(var(--spacing-unit) * 2);
  z-index: 1001;
}

.cookie-banner button {
  background-color: var(--primary-color);
  color: var(--text-color);
  border: none;
  padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: background-color 0.3s;
}

.cookie-banner button:hover,
.cookie-banner button:focus-visible {
  background-color: var(--hover-bg);
}

/* ==================================================
   Footer
   ================================================== */
.app-footer {
  background-color: var(--header-bg);
  padding: calc(var(--spacing-unit) * 1.5);
  border-top: 1px solid var(--border-color);
  color: #666;
  font-size: 0.9rem;
  flex-shrink: 0;
}

/* ==================================================
   Media queries
   ================================================== */
@media (max-width: 600px) {
  .app-header {
    flex-direction: column;
    gap: calc(var(--spacing-unit) * 1.5);
  }

  .inicio-frase {
    font-size: 1.8rem;
  }

  .categoria-card {
    padding: calc(var(--spacing-unit) * 2);
  }
}