/* Lumia DS — App shell
 * Layout applicativo condiviso da tutte le pagine:
 * skip link, sr-only, sidebar, transizioni di pagina,
 * section base, doc-page layout (heading, content, nav). */

/* ─── Skip link ─────────────────────────────────────── */
.lumia-skip-link {
  position: absolute;
  top: var(--spacing-100);
  left: var(--spacing-100);
  padding: var(--spacing-100) var(--spacing-200);
  background-color: var(--color-item-primary-idle);
  color: var(--color-text-inverse);
  font-size: var(--font-size-body-small);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-medium);
  transform: translateY(-200%);
  transition: transform var(--motion-duration-short) var(--motion-easing-emphasized);
  z-index: 100;
  text-decoration: none;
}

.lumia-skip-link:focus-visible {
  transform: translateY(0);
}

/* ─── Screen-reader only ────────────────────────────── */
.lumia-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ─── App shell / Sidebar ───────────────────────────── */
.lumia-app-shell {
  --sidebar-width: calc(var(--spacing-800) * 4);
  --sidebar-width-collapsed: var(--spacing-800);
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  min-height: 100vh;
  transition: grid-template-columns var(--motion-duration-long) var(--motion-easing-standard);
}

.lumia-app-shell[data-sidebar="collapsed"] {
  grid-template-columns: var(--sidebar-width-collapsed) minmax(0, 1fr);
}

.lumia-sidebar {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  background-color: var(--color-surface-default);
  border-inline-end: var(--border-width-thin) solid var(--color-border-default);
  z-index: 50;
}

.lumia-sidebar__inner {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding-block: var(--spacing-200);
  padding-inline: var(--spacing-200);
  gap: var(--spacing-300);
  transition: padding-inline var(--motion-duration-long) var(--motion-easing-standard);
}

.lumia-sidebar__brand-row {
  display: flex;
  align-items: center;
  gap: var(--spacing-100);
}

.lumia-shell__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-100);
  color: var(--color-text-default);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-heading-h3);
  text-decoration: none;
  letter-spacing: 0;
  min-width: 0;
}

.lumia-shell__brand-logo {
  color: var(--color-item-primary-idle);
  flex: none;
}

.lumia-shell__brand-mark {
  color: var(--color-text-subtle);
  font-weight: var(--font-weight-regular);
}

.lumia-sidebar__brand-label,
.lumia-sidebar__nav-label {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 12rem;
  transition: opacity var(--motion-duration-long) var(--motion-easing-standard),
              max-width var(--motion-duration-long) var(--motion-easing-standard);
}

.lumia-sidebar .lumia-shell__brand,
.lumia-sidebar__page-nav {
  overflow: hidden;
  max-width: calc(var(--sidebar-width) - var(--spacing-200) * 2);
  transition: opacity var(--motion-duration-long) var(--motion-easing-standard),
              max-width var(--motion-duration-long) var(--motion-easing-standard);
}

.lumia-sidebar__toggle {
  margin-inline-start: auto;
  flex: none;
}

.lumia-sidebar__nav {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-050);
}

.lumia-sidebar__nav .lumia-button {
  justify-content: flex-start;
  width: 100%;
  gap: var(--spacing-150);
}

.lumia-sidebar__nav .lumia-button:not([href]) {
  cursor: default;
  pointer-events: none;
}

.lumia-sidebar__nav-icon {
  flex: none;
  width: var(--spacing-250);
  height: var(--spacing-250);
  color: currentColor;
}

.lumia-sidebar__page-nav {
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.lumia-sidebar__page-nav:not(:empty) {
  padding-top: var(--spacing-200);
  border-top: var(--border-width-thin) solid var(--color-border-default);
}

.lumia-sidebar__footer {
  margin-top: auto;
}

/* Collapsed state: fade out labels & brand, center icons */
.lumia-app-shell[data-sidebar="collapsed"] :is(.lumia-sidebar__brand-label, .lumia-sidebar__nav-label, .lumia-sidebar .lumia-shell__brand, .lumia-sidebar__page-nav, .lumia-theme-select .lumia-select__value) {
  opacity: 0;
  max-width: 0;
  pointer-events: none;
}

.lumia-app-shell[data-sidebar="collapsed"] .lumia-sidebar__inner {
  padding-inline: var(--spacing-100);
}

/* Tooltip on collapsed sidebar buttons */
.lumia-app-shell[data-sidebar="collapsed"] .lumia-sidebar :is(.lumia-button, .lumia-icon-button, .lumia-select__trigger)[aria-label] {
  position: relative;
}

.lumia-app-shell[data-sidebar="collapsed"] .lumia-sidebar :is(.lumia-button, .lumia-icon-button, .lumia-select__trigger)[aria-label]:is(:hover, :focus-visible)::after {
  content: attr(aria-label);
  position: absolute;
  left: calc(100% + var(--spacing-200));
  top: 50%;
  transform: translateY(-50%);
  padding: var(--spacing-075) var(--spacing-150);
  background-color: var(--color-surface-raised);
  color: var(--color-text-default);
  border: var(--border-width-thin) solid var(--color-border-default);
  border-radius: var(--radius-medium);
  box-shadow: var(--shadow-idle);
  font-size: var(--font-size-body-small);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  white-space: nowrap;
  pointer-events: none;
  z-index: 60;
}

/* ─── Theme select (sidebar footer) ─────────────────── */
.lumia-app-shell[data-sidebar="collapsed"] .lumia-theme-select .lumia-select__caret {
  display: none;
}

.lumia-app-shell[data-sidebar="collapsed"] .lumia-theme-select .lumia-select__list {
  left: auto;
  right: 0;
  min-width: 8rem;
}

/* ─── Main area / page transitions ──────────────────── */
.lumia-shell__main {
  min-height: 60vh;
  animation: lumia-page-enter var(--motion-duration-medium) var(--motion-easing-standard);
}

::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: var(--motion-duration-medium);
  animation-timing-function: var(--motion-easing-standard);
}

:root[data-page-transition="leaving"] .lumia-shell__main {
  opacity: 0;
  transform: translateY(var(--spacing-100));
  transition: opacity var(--motion-duration-short) var(--motion-easing-standard), transform var(--motion-duration-short) var(--motion-easing-standard);
}

@keyframes lumia-page-enter {
  from {
    opacity: 0;
    transform: translateY(var(--spacing-100));
  }
}

@media (prefers-reduced-motion: reduce) {
  .lumia-shell__main {
    animation: none;
  }

  :root[data-page-transition="leaving"] .lumia-shell__main {
    opacity: 1;
    transform: none;
    transition: none;
  }

  ::view-transition-old(root),
  ::view-transition-new(root) {
    animation: none;
  }
}

/* ─── Section base ──────────────────────────────────── */
.lumia-section {
  padding: var(--spacing-800) 0;
}

.lumia-section__inner {
  max-width: calc(var(--spacing-1000) * 14);
  margin: 0 auto;
  padding: 0 var(--spacing-300);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-400);
}

.lumia-section__inner > h3.lumia-heading:not(:first-child) {
  margin-top: var(--spacing-400);
}

.lumia-section__header {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-200);
}

.lumia-section__description,
.lumia-section__caption {
  margin: 0;
  color: var(--color-text-subtle);
}

.lumia-section__description {
  font-size: var(--font-size-body-medium);
  line-height: 1.5;
}

.lumia-section__caption {
  font-size: var(--font-size-body-small);
  line-height: 1.4;
}

/* ─── Doc-page layout (tokens, components) ──────────── */
.lumia-page-heading {
  margin: 0 0 var(--spacing-200);
  padding-inline: var(--spacing-100);
}

.lumia-page-heading .lumia-heading {
  font-size: var(--font-size-body-small);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-subtle);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  line-height: 1.2;
}

.lumia-doc-layout {
  padding: 0 var(--spacing-300);
}

.lumia-doc-content {
  min-width: 0;
  max-width: calc(var(--spacing-1000) * 14);
  margin: 0 auto;
}

.lumia-doc-content__title {
  margin: 0;
  padding-top: var(--spacing-600);
}

.lumia-doc-content__title + .lumia-section {
  padding-top: var(--spacing-300);
}

.lumia-doc-content .lumia-section {
  padding: var(--spacing-600) 0;
}

.lumia-doc-content .lumia-section__inner {
  padding: 0;
}

.lumia-page-nav {
  min-height: 0;
  overflow-x: clip;
  overflow-y: auto;
  padding-inline-end: var(--spacing-100);
}

.lumia-page-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-100);
}

.lumia-page-nav .lumia-button {
  justify-content: flex-start;
  width: 100%;
}

.lumia-page-nav__details > summary {
  list-style: none;
  cursor: pointer;
}

.lumia-page-nav__details > summary::-webkit-details-marker {
  display: none;
}

.lumia-page-nav__details > summary::before {
  content: "▸";
  color: var(--color-text-subtle);
  font-size: var(--font-size-body-small);
  transition: transform var(--motion-duration-short) var(--motion-easing-emphasized);
}

.lumia-page-nav__details[open] > summary::before {
  transform: rotate(90deg);
}

.lumia-page-nav__details > summary a {
  flex: 1;
  color: inherit;
  text-decoration: none;
}

.lumia-page-nav__details > summary:has(a[aria-current="true"]) {
  background-color: var(--color-surface-raised);
  color: var(--color-text-default);
}

.lumia-page-nav__sublist {
  list-style: none;
  margin: var(--spacing-050) 0 0;
  padding: 0 0 0 var(--spacing-150);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-025);
  border-left: var(--border-width-thin) solid var(--color-border-default);
}

.lumia-doc-content :is(.lumia-heading[id], .lumia-demo[id], .lumia-token-table tbody[id], .lumia-token-table tr[id]) {
  scroll-margin-top: var(--spacing-600);
}

/* ─── Responsive ────────────────────────────────────── */
@media (max-width: 720px) {
  .lumia-app-shell,
  .lumia-app-shell[data-sidebar="collapsed"] {
    grid-template-columns: minmax(0, 1fr);
  }

  .lumia-sidebar {
    position: fixed;
    inset-block: 0;
    inset-inline-start: 0;
    width: var(--sidebar-width);
    max-width: 86vw;
    transform: translateX(-100%);
    transition: transform var(--motion-duration-long) var(--motion-easing-standard);
    box-shadow: var(--shadow-idle);
  }

  .lumia-app-shell:not([data-sidebar="collapsed"]) .lumia-sidebar {
    transform: translateX(0);
  }

  .lumia-app-shell:not([data-sidebar="collapsed"])::before {
    content: "";
    position: fixed;
    inset: 0;
    background-color: color-mix(in srgb, var(--color-surface-default) 92%, transparent);
    backdrop-filter: saturate(140%) blur(8px);
    z-index: 40;
  }

  .lumia-app-shell[data-sidebar="collapsed"] :is(.lumia-sidebar__brand-label, .lumia-sidebar__nav-label, .lumia-sidebar__page-nav, .lumia-shell__brand, .lumia-theme-select .lumia-select__value) {
    opacity: 1;
    max-width: 12rem;
    pointer-events: auto;
  }

  .lumia-sidebar__floating-toggle {
    position: fixed;
    top: var(--spacing-150);
    left: var(--spacing-150);
    z-index: 60;
    box-shadow: var(--shadow-static);
  }

  .lumia-app-shell:not([data-sidebar="collapsed"]) .lumia-sidebar__floating-toggle {
    display: none;
  }

  .lumia-section { padding: var(--spacing-500) 0; }
  .lumia-section__inner { padding-inline: var(--spacing-200); }
}

@media (min-width: 721px) {
  .lumia-sidebar__floating-toggle {
    display: none;
  }
}