/* ============================================================
   LAYOUT — estructura, grid y breakpoints
   Breakpoints:
     mobile:  < 768px   (base, mobile-first)
     tablet:  >= 768px
     desktop: >= 1024px
     wide:    >= 1280px
   ============================================================ */

/* --- App shell --- */
#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.app-main {
  flex: 1;
  padding: var(--space-4);
}

.app-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-4);
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

/* --- Contenedor centralizado --- */
.container {
  width: 100%;
  margin-inline: auto;
  padding-inline: var(--space-4);
}

@media (min-width: 640px)  { .container { max-width: var(--container-sm);  } }
@media (min-width: 768px)  { .container { max-width: var(--container-md);  padding-inline: var(--space-6); } }
@media (min-width: 1024px) { .container { max-width: var(--container-lg);  } }
@media (min-width: 1280px) { .container { max-width: var(--container-xl);  } }
@media (min-width: 1536px) { .container { max-width: var(--container-2xl); } }

/* --- Grid system --- */
.grid {
  display: grid;
  gap: var(--space-4);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* En mobile todos los grids colapsan a 1 columna */
@media (max-width: 767px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .grid-3, .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Grid auto-responsive sin clases extra */
.grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(280px, 100%), 1fr));
  gap: var(--space-4);
}

/* --- Flex helpers --- */
.flex       { display: flex; }
.flex-col   { flex-direction: column; }
.flex-wrap  { flex-wrap: wrap; }
.items-center  { align-items: center; }
.items-start   { align-items: flex-start; }
.items-end     { align-items: flex-end; }
.justify-center  { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end     { justify-content: flex-end; }
.gap-2  { gap: var(--space-2); }
.gap-4  { gap: var(--space-4); }
.gap-6  { gap: var(--space-6); }
.gap-8  { gap: var(--space-8); }

/* --- Spacing helpers --- */
.mt-auto { margin-top: auto; }
.p-4  { padding: var(--space-4); }
.p-6  { padding: var(--space-6); }
.py-4 { padding-block: var(--space-4); }
.py-8 { padding-block: var(--space-8); }
.px-4 { padding-inline: var(--space-4); }

/* --- Navigation --- */
.nav {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  height: 56px;
  padding-inline: var(--space-4);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-base);
  font-weight: var(--font-bold);
  color: var(--color-text);
  text-decoration: none;
  flex-shrink: 0;
  letter-spacing: -0.01em;
}
.nav-brand:hover { opacity: 0.85; }

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-left: auto;
  list-style: none;
  margin-block: 0;
  padding: 0;
}

/* ── Estilos base de cada link ─────────────────────────── */
.nav-link {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-muted);
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--transition-fast), color var(--transition-fast);
  line-height: 1;
}

/* Hover — fondo sutil */
.nav-link:hover {
  background: var(--color-bg-alt);
  color: var(--color-text);
}

/* Activo — pill de color primario */
.nav-link.is-active {
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: var(--font-semi);
}

/* Link de acción destacada ("Nuevo Viaje") */
.nav-link.nav-link-accent {
  color: var(--color-primary);
  font-weight: var(--font-semi);
  border: 1px solid var(--color-primary-light);
}
.nav-link.nav-link-accent:hover {
  background: var(--color-primary-light);
}
.nav-link.nav-link-accent.is-active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* Hamburger menu para mobile */
.nav-toggle {
  display: none;
  margin-left: auto;
  padding: var(--space-2);
  border: none;
  background: transparent;
  color: var(--color-text);
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}
.nav-toggle:hover { background: var(--color-bg-alt); }

@media (max-width: 767px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-1);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-3) var(--space-4);
    box-shadow: var(--shadow-md);
    z-index: var(--z-dropdown);
  }

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

  .nav-toggle { display: flex; }

  /* En mobile los links ocupan todo el ancho */
  .nav-link {
    border-radius: var(--radius-md);
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-base);
    justify-content: flex-start;
  }

  /* Activo en mobile: pill + borde izquierdo */
  .nav-link.is-active {
    background: var(--color-primary-light);
    color: var(--color-primary);
    border-left: 3px solid var(--color-primary);
    padding-left: calc(var(--space-4) - 3px);
  }

  .nav-link.nav-link-accent.is-active {
    border-left: 3px solid var(--color-primary);
    padding-left: calc(var(--space-4) - 3px);
  }
}

/* --- Page views (SPA router) --- */
.view {
  display: none;
  animation: fadeIn var(--transition-normal);
}

.view.is-active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* --- Loading state --- */
.page-loader {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
}

/* --- Overlay de carga inicial --- */
.carga-inicial-overlay {
  position: fixed;
  inset: 0;
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity var(--transition-normal);
}

.carga-inicial-overlay.oculto {
  opacity: 0;
  pointer-events: none;
}

.carga-inicial-contenido {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-8);
}

/* --- Nav: sección de usuario autenticado --- */
.nav-usuario {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.nav-nombre {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text);
  max-width: 110px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* --- Modo login: oculta nav, footer y padding para pantalla limpia --- */
/* La clase se activa/desactiva desde login.js en mount/unmount */
body.login-mode .app-header,
body.login-mode .app-footer {
  display: none;
}

body.login-mode .app-main {
  padding: 0;
}