/* Reset, document defaults, app shell. On a laptop-sized screen the page fits the window
   (header + one working area + bottom navigation) so the learner does not scroll. */

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

[hidden] {
  display: none !important;
}

html {
  color-scheme: light;
  -webkit-tap-highlight-color: transparent;
  -webkit-text-size-adjust: 100%;
  scroll-padding-block-start: calc(var(--size-header) + var(--space-4));
  scroll-padding-block-end: calc(var(--size-navbar) + var(--space-4));
}

html[data-theme="dark"] {
  color-scheme: dark;
}

body {
  margin: 0;
  min-block-size: 100vh;
  min-block-size: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--color-surface-page);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
p,
figure,
ul,
ol,
dl,
dd,
blockquote {
  margin: 0;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

img,
svg,
video,
iframe {
  display: block;
  max-inline-size: 100%;
}

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

button {
  cursor: pointer;
}

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

:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus-ring);
  border-radius: var(--radius-sm);
}

[tabindex="-1"]:focus {
  outline: none;
}

.sr-only {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  inset-block-start: var(--space-2);
  inset-inline-start: var(--space-2);
  z-index: var(--z-overlay);
  padding: var(--space-2) var(--space-3);
  background: var(--color-action-primary);
  color: var(--color-on-action);
  border-radius: var(--radius-sm);
  transform: translateY(-200%);
}

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

.icon {
  inline-size: var(--size-icon);
  block-size: var(--size-icon);
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon--lg {
  inline-size: var(--size-icon-lg);
  block-size: var(--size-icon-lg);
}

/* ---------- header ---------- */

.app-header {
  position: sticky;
  inset-block-start: 0;
  z-index: var(--z-header);
  background: var(--color-surface-header);
  border-block-end: var(--border-hairline) solid var(--color-border-subtle);
}

.devbar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--gutter);
  background: var(--color-stage);
  color: var(--color-on-stage);
  font-size: var(--text-xs);
  font-weight: 700;
  text-align: center;
  text-wrap: balance;
}

.devbar .icon {
  flex: none;
  inline-size: 1rem;
  block-size: 1rem;
}

.app-header__inner {
  max-inline-size: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
  min-block-size: var(--size-header);
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.brand {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.brand__mark {
  inline-size: 1.75rem;
  block-size: 1.75rem;
  color: var(--color-action-primary);
}

.app-header__tools {
  margin-inline-start: auto;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* admin account only: links to the admin page and devmode */
.admin-tools {
  display: flex;
  gap: var(--space-1);
}

.admin-tools .btn {
  white-space: nowrap;
}

/* ---------- course progress (modules) ---------- */

.course-bar {
  flex: 1;
  min-inline-size: 0;
  max-inline-size: 44rem;
  margin-inline: auto;
  display: grid;
  gap: var(--space-1);
}

.course-bar__segments {
  display: flex;
  gap: var(--space-1);
}

.course-bar__seg {
  position: relative;
  min-inline-size: 0;
  display: grid;
  gap: 0.15rem;
}

/* the current page: a dot on the track that slides with every page */
.course-bar__cursor {
  position: absolute;
  inset-block-start: calc(0.375rem / 2);
  inset-inline-start: var(--at, 0%);
  inline-size: 0.75rem;
  block-size: 0.75rem;
  border-radius: var(--radius-pill);
  background: var(--color-action-primary);
  box-shadow: 0 0 0 var(--border-strong) var(--color-surface-header);
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: inset-inline-start var(--duration-moderate) var(--ease-out), opacity var(--duration-base) var(--ease-out);
}

.course-bar__seg[data-current="true"] .course-bar__cursor {
  opacity: 1;
}

.course-bar__track {
  block-size: 0.375rem;
  border-radius: var(--radius-pill);
  background: var(--color-border-subtle);
  overflow: hidden;
}

.course-bar__fill {
  display: block;
  block-size: 100%;
  inline-size: var(--fill, 0%);
  border-radius: var(--radius-pill);
  background: var(--color-action-primary);
  transition: inline-size var(--duration-moderate) var(--ease-out);
}

.course-bar__label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.2;
}

.course-bar__seg[data-current="true"] .course-bar__label {
  color: var(--color-text-primary);
  font-weight: 700;
}

/* ---------- main + footer navigation ---------- */

.app-main {
  flex: 1;
  min-block-size: 0;
  inline-size: 100%;
  max-inline-size: var(--container);
  margin-inline: auto;
  padding: var(--space-2) var(--gutter) var(--space-3);
  display: flex;
  flex-direction: column;
}

#page {
  flex: 1;
  min-block-size: 0;
  display: flex;
  flex-direction: column;
}

.app-nav {
  position: sticky;
  inset-block-end: 0;
  z-index: var(--z-sticky);
  background: var(--color-surface-header);
  border-block-start: var(--border-hairline) solid var(--color-border-subtle);
}

.app-nav__inner {
  max-inline-size: var(--container);
  margin-inline: auto;
  padding: var(--space-2) var(--gutter);
  min-block-size: var(--size-navbar);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.app-nav__status {
  flex: 1;
  min-inline-size: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  text-align: center;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  text-wrap: balance;
}

.app-nav__status[data-ready="true"] {
  color: var(--color-text-primary);
  font-weight: 600;
}

.app-nav__step {
  font-weight: 700;
  color: var(--color-text-primary);
  white-space: nowrap;
}

/* ---------- fit-to-window mode: laptop and desktop ---------- */

@media (min-width: 64rem) and (min-height: 38rem) {
  body {
    block-size: 100vh;
    block-size: 100dvh;
    overflow: hidden;
  }
}

/* ---------- narrow screens ---------- */

@media (max-width: 58rem) {
  .course-bar__label,
  .admin-tools .btn span {
    display: none;
  }
}

@media (max-width: 36rem) {
  .brand__name,
  .hud__meta [data-name],
  .admin-tools {
    display: none;
  }

  .app-header__inner,
  .app-header__tools {
    gap: var(--space-2);
  }

  .hud {
    gap: var(--space-2);
    padding-inline-end: var(--space-3);
  }

  .app-nav {
    --size-navbar: 6.25rem;
  }

  .app-nav__inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    row-gap: var(--space-2);
  }

  .app-nav__status {
    grid-column: 1 / -1;
    order: -1;
    font-size: var(--text-xs);
  }

  .app-nav .btn {
    inline-size: 100%;
    padding-inline: var(--space-3);
  }
}

@media (max-width: 30rem) {
  .brand,
  .course-bar,
  .hud .hud__meta {
    display: none;
  }
}

/* ---------- signed-out state: only the brand and the theme switch are shown ---------- */

body[data-auth="out"] .course-bar,
body[data-auth="out"] .hud,
body[data-auth="out"] #mapBtn,
body[data-auth="out"] #resetBtn,
body[data-auth="out"] .app-nav {
  display: none;
}

/* the header is empty when signed out, so the brand stays even on a phone (it is hidden there only in the course) */
body[data-auth="out"] .brand {
  display: inline-flex;
}

/* ---------- devices: touch, notch and home indicator, large monitors ---------- */

button,
a,
input,
label,
summary,
select {
  touch-action: manipulation;
}

.app-header {
  padding-block-start: env(safe-area-inset-top, 0px);
}

.app-header__inner,
.app-nav__inner {
  padding-inline-start: max(var(--gutter), env(safe-area-inset-left, 0px));
  padding-inline-end: max(var(--gutter), env(safe-area-inset-right, 0px));
}

.app-main {
  padding-inline-start: max(var(--gutter), env(safe-area-inset-left, 0px));
  padding-inline-end: max(var(--gutter), env(safe-area-inset-right, 0px));
}

.app-nav {
  padding-block-end: env(safe-area-inset-bottom, 0px);
}

/* Large monitors: the whole interface grows, so it does not float small in the middle. */
@media (min-width: 100rem) {
  html {
    font-size: 112.5%;
  }
}

@media (min-width: 140rem) {
  html {
    font-size: 125%;
  }
}