:root {
  color-scheme: light;
  --bg: var(--tg-theme-bg-color, #f4f7fb);
  --panel: var(--tg-theme-secondary-bg-color, #ffffff);
  --ink: var(--tg-theme-text-color, #182230);
  --muted: var(--tg-theme-hint-color, #667085);
  --line: var(--tg-theme-section-separator-color, #d0d5dd);
  --accent: var(--tg-theme-link-color, #2563eb);
  --study: #b45309;
  --known: #15803d;
}

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

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
select {
  font: inherit;
}

.app {
  width: min(100%, 760px);
  min-height: 100vh;
  min-height: var(--app-viewport-height, 100dvh);
  margin: 0 auto;
  padding: 16px;
  padding-top: max(16px, env(safe-area-inset-top, 0px), var(--tg-safe-area-inset-top, 0px), var(--tg-content-safe-area-inset-top, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px), var(--tg-safe-area-inset-right, 0px), var(--tg-content-safe-area-inset-right, 0px));
  padding-bottom: max(16px, env(safe-area-inset-bottom, 0px), var(--tg-safe-area-inset-bottom, 0px), var(--tg-content-safe-area-inset-bottom, 0px));
  padding-left: max(16px, env(safe-area-inset-left, 0px), var(--tg-safe-area-inset-left, 0px), var(--tg-content-safe-area-inset-left, 0px));
  display: grid;
  grid-template-rows: auto auto auto auto minmax(0, 1fr) auto;
  gap: 12px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: 28px;
  line-height: 1.1;
}

#progressText {
  margin-top: 4px;
  color: var(--muted);
  font-size: 14px;
}

.filters {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

select,
button {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--ink);
  padding: 0 12px;
}

button {
  cursor: pointer;
  font-weight: 650;
}

.card-stage {
  min-height: 0;
  display: grid;
  align-items: center;
}

.word-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 14px 34px rgba(16, 24, 40, 0.10);
  touch-action: pan-y;
}

.word-card img {
  display: block;
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  background: #eef2f6;
}

.word-body {
  padding: 16px;
}

.episode {
  color: var(--muted);
  font-size: 13px;
}

h2 {
  margin-top: 6px;
  font-size: 34px;
  line-height: 1.05;
}

.translation {
  margin-top: 6px;
  color: var(--accent);
  font-size: 22px;
  font-weight: 700;
}

.association {
  margin-top: 12px;
  color: var(--ink);
  line-height: 1.45;
}

.actions {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: 8px;
}

#studyButton {
  color: var(--study);
}

#knownButton {
  color: var(--known);
}

@media (max-width: 540px) {
  .app {
    padding: 12px;
  }

  .filters,
  .actions {
    grid-template-columns: 1fr 1fr;
  }

  h2 {
    font-size: 30px;
  }
}

/* Telegram supplies its own accessible primary action at the bottom.
   Keep the normal in-page button for standalone browsers and old clients. */
.tg-main-enabled #knownButton {
  display: none;
}

.tg-main-enabled .actions {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

:where(button, select):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (max-width: 540px) {
  .tg-main-enabled .actions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .app {
    padding-top: max(12px, env(safe-area-inset-top, 0px), var(--tg-safe-area-inset-top, 0px), var(--tg-content-safe-area-inset-top, 0px));
    padding-right: max(12px, env(safe-area-inset-right, 0px), var(--tg-safe-area-inset-right, 0px), var(--tg-content-safe-area-inset-right, 0px));
    padding-bottom: max(12px, env(safe-area-inset-bottom, 0px), var(--tg-safe-area-inset-bottom, 0px), var(--tg-content-safe-area-inset-bottom, 0px));
    padding-left: max(12px, env(safe-area-inset-left, 0px), var(--tg-safe-area-inset-left, 0px), var(--tg-content-safe-area-inset-left, 0px));
  }
}

/* Compact learning dashboard: use the Telegram palette, no external UI toolkit. */
.learning-nav {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 6px;
}
.learning-nav button {
  min-height: 44px;
  padding: 6px 4px;
  font-size: 13px;
  font-weight: 600;
}
.learning-nav button[aria-pressed="true"] {
  border-color: var(--accent);
  background: var(--tg-theme-button-color, #2563eb);
  color: var(--tg-theme-button-text-color, #fff);
}
.learning-status {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 13px;
}
.learning-status span { color: var(--muted); }
[hidden] { display: none !important; }
@media (max-width: 540px) {
  .learning-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .learning-status { display: block; }
  .learning-status span { display: block; margin-top: 3px; }
}