:root {
  --page: #e9ece8;
  --page-text: #1b2420;
  --page-muted: #5a6560;
  --page-accent: #2d5e48;
  --surface: #fbfcfa;
  --line: rgb(45 70 58 / 20%);
  --shadow: 0 10px 30px rgb(20 35 28 / 14%);
  color-scheme: light dark;

  @media (prefers-color-scheme: dark) {
    --page: #111614;
    --page-text: #edf2ee;
    --page-muted: #a3aea8;
    --page-accent: #8fc7a8;
    --surface: #1b2220;
    --line: rgb(163 174 168 / 22%);
    --shadow: 0 10px 30px rgb(0 0 0 / 40%);
  }
}

* {
  box-sizing: border-box;
}

body {
  background: var(--page);
  color: var(--page-text);
  font-family: ui-rounded, "Avenir Next", Avenir, system-ui, sans-serif;
  line-height: 1.5;
  margin: 0;

  /* Flashcards fill the window, so the card and its buttons stay put. */
  &:has(#study:not([hidden])) {
    display: flex;
    flex-direction: column;
    height: 100dvh;
  }
}

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

.bar {
  align-items: center;
  background: var(--page);
  border-bottom: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  padding: 10px 16px;
  position: sticky;
  top: 0;
  z-index: 1;

  h1 {
    font-family: Georgia, "Times New Roman", serif;
    font-size: 1.5rem;
    line-height: 1;
    margin: 0;
  }

  /* On a phone, everything fits on one line. */
  @media (width < 600px) {
    gap: 10px;
    padding-inline: 12px;

    h1 {
      font-size: 1.15rem;
    }

    .wide {
      display: none;
    }

    .narrow {
      display: inline;
    }
  }

  /* On the smallest phones, the download link is just its icon. */
  @media (width < 440px) {
    .narrow {
      display: none;
    }
  }

  a {
    color: var(--page-accent);
  }

  .links {
    display: flex;
    font-size: 0.9rem;
    gap: 16px;
    margin-inline-start: auto;
  }

  .download {
    align-items: center;
    display: flex;
    font-weight: 700;
    gap: 4px;

    svg {
      height: 1.1em;
      width: 1.1em;
    }
  }

  .narrow {
    display: none;
  }
}

.modes {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  display: inline-flex;
  padding: 3px;

  button {
    background: none;
    border: 0;
    border-radius: 999px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 700;
    padding: 4px 14px;

    @media (width < 600px) {
      font-size: 0.85rem;
      padding-inline: 10px;
    }

    &[aria-pressed="true"] {
      background: var(--page-accent);
      color: var(--surface);
    }
  }
}

main {
  margin-inline: auto;
  max-width: 1200px;
  padding-inline: 16px;
  width: 100%;

  body:has(#study:not([hidden])) & {
    display: flex;
    flex: 1;
    flex-direction: column;
    max-width: 760px;
    min-height: 0;
  }
}

.toolbar {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  font-size: 0.9rem;
  gap: 8px 12px;
  margin-block: 12px;

  select,
  input {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 4px 8px;
  }

  select {
    flex: 0 1 auto;
    min-width: 0;
  }

  input {
    flex: 1 1 16em;
    padding: 6px 12px;
  }

  #study & {
    flex-wrap: nowrap;
  }
}

#study:not([hidden]) {
  display: flex;
  flex: 1;
  flex-direction: column;
  min-height: 0;
  padding-bottom: 12px;
}

#progress {
  color: var(--page-muted);
  margin-inline-start: auto;
  white-space: nowrap;
}

/* The deck's own styles fill a whole Anki window; here a card is a panel. It
   takes focus only so that the keyboard reaches it, so it shows no ring. */
main .card,
#viewer .card {
  border-radius: 18px;
  outline: none;
  padding: 20px;
}

#study-card {
  box-shadow: var(--shadow);
  flex: 1;
  min-height: 0;
  overflow-y: auto;

  &:not(.revealed) {
    align-content: center;
    cursor: pointer;
    display: grid;
  }
}

/* Links between cards keep the deck's dotted underline. */
.card .extra a:not(.ref),
.card a.ref {
  color: inherit;
}

.card a.ref:hover,
.card .extra a:hover {
  color: var(--accent);
}

.actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 12px;

  button {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 10px;
    cursor: pointer;
    font-weight: 700;
    padding: 8px 18px;
    white-space: nowrap;
    width: 10.5em;

    &.primary {
      background: var(--page-accent);
      border-color: transparent;
      color: var(--surface);
    }

    &:disabled {
      cursor: default;
      opacity: 0.4;
    }
  }
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;

  button {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 999px;
    cursor: pointer;
    font-size: 0.85rem;
    padding: 3px 12px;

    &[aria-pressed="true"] {
      background: var(--page-accent);
      border-color: transparent;
      color: var(--surface);
    }
  }
}

.grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  list-style: none;
  margin: 0 0 24px;
  padding: 0;

  a {
    background: var(--surface);
    border-radius: 12px;
    box-shadow: 0 2px 10px rgb(20 35 28 / 10%);
    color: inherit;
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
    text-decoration: none;

    &:hover {
      outline: 2px solid var(--page-accent);
    }
  }

  img,
  .no-image {
    aspect-ratio: 4 / 3;
    background: var(--line);
    display: block;
    object-fit: cover;
    width: 100%;
  }

  img.mirrored {
    transform: scaleX(-1);
  }

  .no-image {
    align-content: center;
    color: var(--page-accent);
    display: grid;
    font-size: 0.7rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-align: center;
    text-transform: uppercase;
  }
}

.tile-term {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.15;
  overflow-wrap: anywhere;
  padding: 8px 10px 2px;
}

.tile-gloss {
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  color: var(--page-muted);
  display: -webkit-box;
  font-size: 0.8rem;
  line-height: 1.3;
  margin: 0 10px 10px;
  overflow: hidden;
}

#empty {
  color: var(--page-muted);
  text-align: center;
}

#viewer {
  background: none;
  border: 0;
  max-height: calc(100dvh - 32px);
  max-width: 760px;
  padding: 0;
  width: calc(100vw - 32px);

  &::backdrop {
    background: rgb(10 18 14 / 60%);
  }

  /* An icon rather than "×", whose glyph sits off-center in many fonts. */
  .close {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 999px;
    cursor: pointer;
    display: grid;
    height: 2.2rem;
    padding: 0;
    place-items: center;
    position: absolute;
    right: 10px;
    top: 10px;
    width: 2.2rem;
    z-index: 1;

    svg {
      height: 1rem;
      width: 1rem;
    }
  }
}