/* The web app's shell: page basics, screens and their transitions, and the shell's own screens
   (Home, Recent files, Settings, About, Open-source licenses, Choose a tool). Phone first (from
   320 px), centred with a maximum width on wider screens. Colours, radii and spacing come from
   ../../assets/css/tokens.css; the UI kit's components are styled in css/components.css. */

/* ---- Page ---- */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  background: var(--background);
  /* A control reached with Tab is scrolled clear of the sticky top bar (64 px and the safe area)
     and, while a screen has one, of its bottom bar (its main button), not left under them. */
  scroll-padding-block-start: calc(72px + env(safe-area-inset-top, 0px));
}

html:has(.ui-bottombar:not([hidden])) {
  scroll-padding-block-end: calc(80px + env(safe-area-inset-bottom, 0px));
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--background);
  color: var(--on-background);
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.5;
  -webkit-tap-highlight-color: transparent;
  overflow-wrap: break-word;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

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

img,
svg,
canvas {
  max-width: 100%;
}

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

/* Headings and screens take the focus to be announced, not to be operated: no ring. */
h1[tabindex="-1"]:focus,
h2[tabindex="-1"]:focus,
[role="heading"][tabindex="-1"]:focus,
.screen[tabindex="-1"]:focus,
[data-main][tabindex="-1"]:focus {
  outline: none;
}

/* hidden hides, whatever display a class gives the element. */
[hidden] {
  display: none !important;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.icon {
  display: inline-block;
  flex: none;
  vertical-align: middle;
}

[dir="rtl"] .icon-mirrored {
  transform: scaleX(-1);
}

.skip-link {
  position: fixed;
  inset-inline-start: var(--space-2);
  top: var(--space-2);
  z-index: 1000;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-full);
  background: var(--primary);
  color: var(--on-primary);
  font-weight: 600;
  text-decoration: none;
  transform: translateY(-200%);
  transition: transform var(--duration) var(--ease);
}

.skip-link:focus {
  transform: none;
}

.noscript {
  max-width: 40rem;
  margin: var(--space-7) auto;
  padding: 0 var(--gutter);
}

/* ---- Screens ---- */

.app {
  min-height: 100vh;
  min-height: 100dvh;
  /* A screen sliding in mustn't make the page scroll sideways (clip keeps sticky bars working). */
  overflow-x: clip;
}

.screen {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* Motion.kt's screen change: the new screen slides in a short way while it fades in. */
@keyframes screen-in-forward {
  from {
    opacity: 0;
    transform: translateX(24px);
  }
}

@keyframes screen-in-back {
  from {
    opacity: 0;
    transform: translateX(-24px);
  }
}

.screen-forward {
  animation: screen-in-forward calc(var(--duration) * 1.5) cubic-bezier(0.05, 0.7, 0.1, 1) both;
}

.screen-back {
  animation: screen-in-back calc(var(--duration) * 1.5) cubic-bezier(0.05, 0.7, 0.1, 1) both;
}

[dir="rtl"] .screen-forward {
  animation-name: screen-in-back;
}

[dir="rtl"] .screen-back {
  animation-name: screen-in-forward;
}

@media (prefers-reduced-motion: reduce) {
  .screen-forward,
  .screen-back {
    animation: none;
  }
}

/* A thin bar at the top while a screen takes a moment to load (shown only after 300 ms). */
@keyframes route-progress {
  from {
    transform: translateX(-100%);
  }
  to {
    transform: translateX(250%);
  }
}

@keyframes appear {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.route-progress {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 50;
  height: 3px;
  overflow: hidden;
  opacity: 0;
  animation: appear 1ms linear 300ms forwards;
  pointer-events: none;
}

.route-progress::before {
  content: "";
  display: block;
  width: 40%;
  height: 100%;
  background: var(--primary);
  animation: route-progress 1.2s var(--ease) infinite;
}

@media (prefers-reduced-motion: reduce) {
  .route-progress::before {
    width: 100%;
    animation: none;
    opacity: 0.6;
  }
}

/* The content of a screen under its top bar: the app's 20 dp sides on a phone, centred with a
   maximum width on wider screens. */
.page {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding: var(--space-3) 20px calc(var(--space-6) + env(safe-area-inset-bottom, 0px));
  padding-inline: max(20px, env(safe-area-inset-left, 0px));
}

.page--narrow {
  max-width: 760px;
}

.page--list {
  padding-inline: 0;
}

@media (min-width: 840px) {
  .page {
    padding-inline: var(--space-6);
  }

  .page--list {
    padding-inline: var(--space-5);
  }
}

/* ---- The shell's own bar and message, for a screen that couldn't load (no UI kit needed) ---- */

.shell-bar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: var(--space-1);
  min-height: 64px;
  padding: var(--space-2) var(--space-1);
  background: var(--surface);
}

.shell-bar-title {
  margin: 0;
  padding-inline: var(--space-3);
  font-size: 1.375rem;
  font-weight: 400;
  line-height: 1.3;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.shell-icon-button {
  display: inline-grid;
  place-items: center;
  width: var(--touch);
  height: var(--touch);
  padding: 0;
  border: 0;
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--on-surface-variant);
  cursor: pointer;
}

.shell-icon-button:hover {
  background: color-mix(in srgb, var(--on-surface) 8%, transparent);
}

.shell-problem {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  max-width: 34rem;
  margin: var(--space-7) auto;
  padding: 0 var(--space-5);
  text-align: center;
  color: var(--on-surface-variant);
}

.shell-problem p {
  margin: 0;
  color: var(--on-surface);
  font-size: 1.0625rem;
}

.shell-problem-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-3);
}

.shell-button {
  min-height: 40px;
  padding: 10px 24px;
  border-radius: var(--radius-full);
  font-weight: 500;
  font-size: 0.875rem;
  cursor: pointer;
}

.shell-button-filled {
  border: 0;
  background: var(--primary);
  color: var(--on-primary);
}

.shell-button-outlined {
  border: 1px solid var(--outline);
  background: transparent;
  color: var(--primary);
}

/* ---- Home ---- */

.home-subtitle {
  margin: 0;
  color: var(--on-surface-variant);
  font-size: 1rem;
  line-height: 1.5;
}

.home-top {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.home-top[hidden],
.home-sections[hidden],
.home-results[hidden] {
  display: none;
}

@media (min-width: 840px) {
  .home-top.has-recent {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* Files dragged over Home (on a computer): dropped, they open as files shared to the app do. */
.home-page.is-dragover {
  border-radius: var(--radius-l);
  outline: 2px dashed var(--primary);
  outline-offset: -4px;
  background: color-mix(in srgb, var(--primary) 4%, transparent);
}

/* Scan document: larger than the tools' cards, in the theme's main colour. */
.scan-card {
  margin: 0;
  padding: 20px 20px 16px;
  border-radius: var(--radius-m);
  background: var(--primary-container);
  color: var(--on-primary-container);
}

.scan-card-head {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.scan-card-head .icon {
  width: 48px;
  height: 48px;
}

.scan-card-title {
  margin: 0;
  font-size: 1.375rem;
  font-weight: 400;
  line-height: 1.3;
}

.scan-card-detail {
  margin: 2px 0 0;
  font-size: 0.875rem;
  line-height: 1.45;
}

/* Side by side, as tall as each other when a long label takes two lines. */
.scan-card-buttons {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.scan-card-buttons > * {
  width: 100%;
  min-width: 0;
  height: 100%;
  white-space: normal;
  text-align: center;
}

/* Recent files on Home: a heading with See all, then the last three. */
.home-recent-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-top: 6px;
}

.home-recent-head h2 {
  margin: 0;
  color: var(--primary);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.1px;
}

/* The search field: a rounded bar like Material's search bar. */
.home-search {
  position: relative;
  display: flex;
  align-items: center;
  margin-top: var(--space-4);
  min-height: 56px;
  border-radius: var(--radius-full);
  background: var(--surface-high);
  color: var(--on-surface);
}

.home-search:focus-within {
  outline: 2px solid var(--primary);
  outline-offset: 0;
}

.home-search-icon {
  display: grid;
  place-items: center;
  width: 52px;
  flex: none;
  color: var(--on-surface-variant);
}

.home-search input {
  flex: 1;
  min-width: 0;
  height: 56px;
  padding: 0;
  border: 0;
  background: transparent;
  font-size: 1rem;
  outline: none;
}

.home-search input::placeholder {
  color: var(--on-surface-variant);
  opacity: 1;
}

.home-search input::-webkit-search-cancel-button,
.home-search input::-webkit-search-decoration {
  -webkit-appearance: none;
  appearance: none;
}

.home-search-clear {
  margin-inline-end: var(--space-1);
}

.home-search-clear[hidden] {
  display: none;
}

.home-search-key {
  display: none;
  margin-inline-end: var(--space-4);
  padding: 0 var(--space-2);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-xs);
  color: var(--on-surface-variant);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

@media (min-width: 840px) and (hover: hover) and (pointer: fine) {
  .home-search-key {
    display: inline-block;
  }

  .home-search-key[hidden],
  .home-search:focus-within .home-search-key {
    display: none;
  }
}

/* A small heading over a group of tool cards, which a screen reader can jump to. */
.home-section-heading,
.home-results-count {
  margin: 18px 0 8px;
  color: var(--primary);
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.43;
  letter-spacing: 0.1px;
}

.home-results-count.is-none {
  margin-top: var(--space-5);
  color: var(--on-surface-variant);
  font-size: 1rem;
  font-weight: 400;
}

.home-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
}

@media (min-width: 600px) {
  .home-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-2);
  }
}

@media (min-width: 1100px) {
  .home-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.home-grid > * {
  min-width: 0;
}

/* The scan card among search results takes a row of its own. */
.home-grid > .scan-card {
  grid-column: 1 / -1;
}

/* ---- Recent files ---- */

.recent-list {
  display: grid;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.recent-row {
  display: flex;
  align-items: center;
  min-height: 64px;
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-m);
  background: var(--surface);
  transition: background-color var(--duration) var(--ease), transform calc(var(--duration) * 0.75) var(--ease);
}

.recent-row:active {
  transform: scale(0.99);
}

.recent-open {
  display: flex;
  flex: 1;
  align-items: center;
  gap: var(--space-4);
  min-width: 0;
  min-height: 62px;
  padding: 10px 0 10px var(--space-4);
  padding-inline: var(--space-4) 0;
  border: 0;
  border-radius: var(--radius-m);
  background: transparent;
  text-align: start;
  cursor: pointer;
}

.recent-open:hover,
.recent-menu:hover {
  background: color-mix(in srgb, var(--on-surface) 6%, transparent);
}

.recent-open > .icon {
  color: var(--primary);
}

.recent-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.recent-name {
  display: -webkit-box;
  overflow: hidden;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  font-size: 1rem;
  line-height: 1.4;
  word-break: break-word;
}

.recent-detail {
  color: var(--on-surface-variant);
  font-size: 0.8125rem;
  line-height: 1.4;
}

.recent-menu {
  display: grid;
  flex: none;
  place-items: center;
  width: var(--touch);
  height: var(--touch);
  margin-inline: var(--space-1);
  padding: 0;
  border: 0;
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--on-surface-variant);
  cursor: pointer;
}

.recent-empty {
  margin: 0;
  padding: var(--space-7) var(--space-6);
  color: var(--on-surface-variant);
  font-size: 1rem;
  text-align: center;
}

.recent-note {
  display: flex;
  gap: var(--space-3);
  margin: var(--space-5) 0 0;
  color: var(--on-surface-variant);
  font-size: 0.8125rem;
  line-height: 1.45;
}

/* ---- Settings, About, licenses ---- */

.settings-list {
  display: grid;
  margin: 0;
  padding: var(--space-2) 0;
}

.settings-external {
  display: inline-grid;
  place-items: center;
  width: var(--touch);
  color: var(--on-surface-variant);
}

/* The choices in the Language and Appearance dialogs: each row one radio choice. */
.choice-list {
  display: grid;
  margin: var(--space-1) calc(-1 * var(--space-2)) 0;
}

.choice-row {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  min-height: var(--touch);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-s);
  color: var(--on-surface);
  font-size: 1rem;
  cursor: pointer;
  user-select: none;
}

.choice-row:hover {
  background: color-mix(in srgb, var(--on-surface) 6%, transparent);
}

.choice-row:focus-visible {
  outline-offset: -2px;
}

.choice-radio {
  position: relative;
  flex: none;
  width: 20px;
  height: 20px;
  margin: 10px;
  border: 2px solid var(--on-surface-variant);
  border-radius: 50%;
}

.choice-row[aria-selected="true"] .choice-radio {
  border-color: var(--primary);
}

.choice-row[aria-selected="true"] .choice-radio::after {
  content: "";
  position: absolute;
  inset: 3px;
  border-radius: 50%;
  background: var(--primary);
}

.about-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-4) var(--space-5);
  text-align: center;
}

/* The launcher icon cropped as a launcher shows it: the middle 72 of its 108 units. */
.app-icon {
  width: 72px;
  height: 72px;
  overflow: hidden;
  border-radius: 20px;
}

.app-icon img {
  display: block;
  width: 108px;
  max-width: none;
  height: 108px;
  margin: -18px;
}

.about-name {
  margin: var(--space-4) 0 var(--space-1);
  font-size: 1.5rem;
  font-weight: 400;
  line-height: 1.33;
}

.about-line {
  margin: 0;
  color: var(--on-surface-variant);
  font-size: 0.875rem;
}

.about-privacy {
  display: flex;
  gap: var(--space-4);
  margin: var(--space-4);
  padding: var(--space-4);
  border-radius: var(--radius-l);
  background: var(--surface-container);
}

.about-privacy > .icon {
  color: var(--primary);
}

.about-privacy p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.45;
}

.about-privacy p + p {
  margin-top: var(--space-2);
  color: var(--on-surface-variant);
}

.about-copyright {
  margin: 0;
  padding: var(--space-5);
  color: var(--on-surface-variant);
  font-size: 0.75rem;
  text-align: center;
}

.licenses-intro {
  margin: 0 0 var(--space-2);
  color: var(--on-surface-variant);
}

.licenses-notices {
  margin-bottom: var(--space-4);
}

.licenses-notices p {
  margin: 0;
  color: var(--on-surface-variant);
}

.licenses-list {
  display: grid;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.license {
  padding: var(--space-4);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-m);
}

.license--own {
  border: 0;
  background: var(--surface-container);
}

.license h2 {
  margin: 0;
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.5;
}

.license-version {
  color: var(--on-surface-variant);
  font-weight: 400;
}

.license p {
  margin: var(--space-1) 0 0;
  font-size: 0.875rem;
  line-height: 1.45;
}

.license-meta {
  color: var(--on-surface-variant);
}

.license-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-4);
  margin-top: var(--space-2);
  font-size: 0.875rem;
}

.license-links a {
  display: inline-flex;
  align-items: center;
  min-height: var(--touch);
  gap: var(--space-1);
  font-weight: 500;
  text-decoration: none;
}

.license-links a:hover {
  text-decoration: underline;
}

/* ---- Choose a tool ---- */

.choose-files {
  display: grid;
  gap: var(--space-3);
}

@media (min-width: 840px) {
  .choose-files {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.choose-hint {
  margin: var(--space-4) 0 0;
  color: var(--on-surface-variant);
  font-size: 0.875rem;
}

.choose-busy {
  margin-bottom: var(--space-4);
}

.choose-tools[hidden],
.choose-busy[hidden] {
  display: none;
}

/* ---- First launch: the language ---- */

.language-page {
  display: grid;
  gap: var(--space-3);
  max-width: 34rem;
  margin: 0 auto;
  padding: var(--space-6) var(--space-5);
}

.language-page h1 {
  margin: var(--space-2) 0 0;
  font-size: 1.5rem;
  font-weight: 400;
}

.language-page p {
  margin: 0 0 var(--space-3);
  color: var(--on-surface-variant);
}

/* ---- Contrast themes (Windows' forced colours) ----
   Backgrounds and shadows are dropped there: what only a background drew gets a border, and what
   is chosen shows in the system's highlight colour. (The kit's components have their own.) */

@media (forced-colors: active) {
  .scan-card,
  .home-search,
  .shell-button-filled {
    border: 1px solid CanvasText;
  }

  .choice-row[aria-selected="true"] .choice-radio {
    border-color: Highlight;
  }

  .choice-row[aria-selected="true"] .choice-radio::after,
  .route-progress::before {
    forced-color-adjust: none;
    background: Highlight;
  }
}