:root {
  color-scheme: dark;
  --page: var(--surface-page);
  --layer: var(--surface-card);
  --primary-200: var(--color-primary-200);
  --primary-300: var(--color-primary-300);
  --primary-400: var(--color-primary-400);
  --primary-500: var(--color-primary-500);
  --primary-600: var(--color-primary-600);
  --primary-700: var(--color-primary-700);
  --primary-800: var(--color-primary-800);
  --primary-900: var(--color-primary-900);
  --body: var(--text-body);
  --body-light: var(--color-primary-700);
  --placeholder: var(--mapped-text-placeholder);
  --border: var(--color-primary-200);
  --again: var(--color-error-500);
  --again-border: var(--color-error-500);
  --hard: var(--color-warning-500);
  --good: var(--color-info-500);
  --easy: var(--color-primary-500);
  --learned: var(--color-success-500);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--page);
}

body {
  min-width: 320px;
  min-height: 100%;
  margin: 0;
  overflow: hidden;
  color: var(--body);
  background: var(--page);
  font-family: "Poppins", sans-serif;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

.anki-app {
  --card-width: min(calc(100vw - 48px), 480px, calc(80svh - 141px));
  position: relative;
  width: min(100%, 512px);
  height: 100svh;
  min-height: 568px;
  margin: 0 auto;
  background: var(--page);
}

.anki-header {
  position: absolute;
  inset: 8px 16px auto;
  height: 40px;
}

.close-button {
  position: absolute;
  inset: 0 auto auto 0;
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  background: var(--layer);
  border: 1px solid var(--border);
  border-radius: 50%;
}

.close-button img {
  width: 24px;
  height: 24px;
}

.brand-lockup {
  position: absolute;
  top: 0;
  left: 50%;
  display: flex;
  height: 40px;
  align-items: center;
  justify-content: center;
  gap: 4px;
  transform: translateX(-50%);
  white-space: nowrap;
}

.tango-logo {
  position: relative;
  display: block;
  width: 45px;
  height: 24px;
}

.tango-logo img {
  position: absolute;
  top: 0;
  display: block;
}

.tango-logo-tan {
  left: 0;
  width: 20.83px;
  height: 22.76px;
}

.tango-logo-go {
  left: 23.77px;
  width: 21.23px;
  height: 23.34px;
}

.brand-slash {
  color: var(--placeholder);
  font-size: 24px;
  font-weight: 400;
  line-height: 1;
}

.brand-anki {
  color: var(--body);
  font-family: "Fugaz One", sans-serif;
  font-size: 24px;
  line-height: 1;
}

.deck-card-numbers {
  position: absolute;
  top: 0;
  right: 0;
  display: grid;
  width: 92px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-template-rows: 29px 29px;
  gap: 6px 4px;
}

.count-pill {
  display: grid;
  min-width: 56px;
  min-height: 30px;
  padding: 4px 12px;
  place-items: center;
  min-width: 0;
  color: var(--body);
  background: rgba(0, 82, 68, 0.34);
  border: 1px solid transparent;
  border-radius: 16px;
  font-size: 14px;
  line-height: 20px;
}

.count-again {
  color: var(--status-error-text);
  background: var(--status-error-bg);
  border-color: var(--status-error-border);
}

.count-learned {
  color: var(--status-success-text);
  background: var(--status-success-bg);
  border-color: var(--status-success-border);
}

.count-remaining {
  grid-column: 1 / -1;
  color: var(--text-body);
  background: rgba(244, 248, 247, 0.07);
  border-color: rgba(231, 239, 237, 0.18);
}

.review-card {
  position: absolute;
  top: 117px;
  left: 50%;
  width: var(--card-width);
  aspect-ratio: 4 / 5;
  margin-left: calc(var(--card-width) / -2);
  perspective: 1200px;
  transform-origin: 50% 78%;
  touch-action: pan-y;
  user-select: none;
  cursor: grab;
  transition:
    transform 220ms ease,
    opacity 220ms ease;
}

.review-card.is-dragging {
  cursor: grabbing;
  transition: none;
}

.card-flipper {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  transition: transform 360ms cubic-bezier(0.2, 0.72, 0.18, 1);
}

.card-flipper.is-flipped {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  inset: 0;
  overflow: hidden;
  background: var(--surface-layer-1);
  border: 1px solid var(--border-subtle);
  border-radius: 24px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.07);
  backface-visibility: hidden;
}

.card-back {
  display: grid;
  padding: 56px 24px 72px;
  place-items: center;
  transform: rotateY(180deg);
}

.card-content {
  position: absolute;
  inset: 0 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.card-reading,
.card-term,
.card-answer {
  margin: 0;
}

.card-reading {
  min-height: 24px;
  color: var(--body-light);
  font-size: 16px;
  font-weight: 500;
  line-height: 24px;
  white-space: pre;
}

.card-term {
  color: var(--body);
  font-size: 48px;
  font-weight: 500;
  line-height: 1.25;
}

.card-answer {
  color: var(--body);
  font-size: clamp(24px, 8vw, 42px);
  font-weight: 600;
  line-height: 1.35;
  text-align: center;
}

.bottom-controls {
  position: absolute;
  right: 16px;
  bottom: 34px;
  left: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.copy-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  gap: 8px;
}

.copy-button {
  display: flex;
  min-width: 140px;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 8px 16px;
  color: var(--text-body);
  background: rgba(244, 248, 247, 0.06);
  border: 1px solid rgba(231, 239, 237, 0.16);
  border-radius: 10px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 400;
  line-height: 20px;
}

.copy-icon {
  display: block;
  width: 12px;
  height: 12px;
  flex: 0 0 auto;
}

.copy-button:disabled {
  cursor: not-allowed;
  opacity: 0.4;
}

.copy-button.is-success {
  color: var(--status-success-text);
  background: var(--status-success-bg);
  border-color: var(--status-success-border);
}

.copy-button.is-error {
  color: var(--status-error-text);
  background: var(--status-error-bg);
  border-color: var(--status-error-border);
}

.answer-buttons {
  display: grid;
  width: 100%;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.answer-button {
  min-width: 0;
  min-height: 40px;
  padding: 8px 5px;
  color: var(--primary-900);
  border: 1px solid transparent;
  border-radius: 10px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  line-height: 20px;
}

.answer-again {
  color: var(--primary-700);
  background: var(--layer);
  border-color: var(--primary-200);
}

.answer-hard {
  color: var(--primary-800);
  background: var(--primary-200);
  border-color: var(--primary-300);
}

.answer-good {
  color: var(--primary-900);
  background: var(--primary-300);
  border-color: var(--primary-400);
}

.answer-easy {
  color: var(--page);
  background: var(--primary-500);
  border-color: var(--primary-600);
  box-shadow: 0 5px 14px rgba(0, 204, 170, 0.16);
}

.swipe-indicators {
  position: absolute;
  z-index: 5;
  top: calc(117px + (var(--card-width) * 0.625));
  right: 6px;
  left: 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  pointer-events: none;
}

.swipe-badge {
  display: flex;
  min-height: 40px;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border: 1px solid transparent;
  border-radius: 12px;
  box-shadow: 0 8px 22px rgba(0, 18, 15, 0.38);
  font-size: 14px;
  font-weight: 600;
  opacity: 0;
  filter: saturate(0.75);
  transition:
    opacity 140ms ease,
    transform 140ms ease,
    filter 140ms ease;
}

.swipe-left {
  color: var(--status-error-text);
  background: var(--status-error-bg);
  border-color: var(--status-error-border);
  transform: translateX(-8px) scale(0.92);
}

.swipe-right {
  color: var(--page);
  background: var(--primary-500);
  border-color: var(--primary-600);
  transform: translateX(8px) scale(0.92);
}

.swipe-arrow {
  font-size: 18px;
  font-weight: 400;
  line-height: 1;
}

.swipe-badge.is-visible {
  opacity: 1;
  filter: saturate(1);
  transform: translateX(0) scale(1);
}

.close-button:focus-visible,
.answer-button:focus-visible,
.copy-button:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

.answer-button:active,
.close-button:active {
  transform: scale(0.98);
}

.answer-button,
.copy-button {
  transition:
    transform 140ms ease,
    color 140ms ease,
    background-color 140ms ease,
    border-color 140ms ease;
}

@media (hover: hover) {
  .answer-button:hover,
  .copy-button:not(:disabled):hover {
    transform: translateY(-1px);
  }

  .copy-button:not(:disabled):hover {
    color: var(--text-heading);
    background: rgba(244, 248, 247, 0.1);
    border-color: rgba(231, 239, 237, 0.28);
  }
}

.sync-status {
  position: absolute;
  right: 16px;
  bottom: 6px;
  left: 16px;
  margin: 0;
  overflow: hidden;
  color: var(--body-light);
  font-size: 11px;
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sync-status:empty {
  display: none;
}

@media (max-height: 650px) {
  .anki-app {
    --card-width: min(calc(100vw - 48px), 480px, calc(80svh - 193px));
  }

  .review-card {
    top: 98px;
  }

  .swipe-indicators {
    top: calc(98px + (var(--card-width) * 0.625));
  }

  .bottom-controls {
    gap: 7px;
  }

  .copy-button {
    min-width: 0;
    flex: 1 1 0;
    min-height: 34px;
    padding-block: 6px;
  }
}

@media (max-width: 350px) {
  .brand-lockup {
    transform: translateX(-50%) scale(0.84);
  }
}

@media (min-width: 403px) {
  body {
    display: grid;
    min-height: 100svh;
    place-items: start center;
  }
}