/**
 * styles.css — Game UI styles.
 * Matches the TinyStudy Games platform design system (global.css tokens).
 * Dark glassmorphism theme, vertical flashcard layout, no-scroll viewport.
 */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* Platform-aligned tokens (from games/src/styles/global.css) */
  --bg:              #0b0b0f;
  --bg-elevated:     #141418;
  --bg-overlay:      #1c1c22;
  --bg-hover:        #222228;

  --surface-border:       rgba(255, 255, 255, 0.07);
  --surface-border-strong: rgba(255, 255, 255, 0.14);

  --text:            #ededf0;
  --text-secondary:  #9898a0;
  --text-muted:      #6e6e78;

  --accent:          #e8b84b;
  --accent-hover:    #f0c65e;
  --accent-muted:    rgba(232, 184, 75, 0.12);
  --accent-dim:      rgba(232, 184, 75, 0.06);

  --purple:          #a78bfa;
  --purple-muted:    rgba(167, 139, 250, 0.16);

  --teal:            #2dd4bf;
  --success:         #34d399;
  --success-muted:   rgba(52, 211, 153, 0.10);
  --danger:          #f87171;
  --danger-muted:    rgba(248, 113, 113, 0.08);

  --radius-sm:  8px;
  --radius-md:  12px;
  --radius-lg:  18px;
  --radius-xl:  24px;

  --font:   'Space Grotesk', system-ui, sans-serif;
  --font-h: 'Fraunces', Georgia, serif;

  --ease-out:    cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast:   120ms;
  --duration-normal: 200ms;
  --duration-slow:   350ms;

  /* Glass card */
  --card-bg:     rgba(20, 20, 26, 0.65);
  --card-border: rgba(255, 255, 255, 0.08);
  --card-glow:   rgba(232, 184, 75, 0.04);
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.5;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding: 0;
  margin: 0;
}

/* ===================================================================
   GAME SHELL — root layout
   =================================================================== */

.game-shell {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  width: 100%;
}

.game-shell__header {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px 16px 16px;
  flex-shrink: 0;
  position: relative;
}

.game-shell__mute {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: color var(--duration-fast), background var(--duration-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.game-shell__mute:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
}

.game-shell__area {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 16px 24px;
}

/* ===================================================================
   SCORE BAR — streak + combo + best
   =================================================================== */

.score-bar {
  display: flex;
  align-items: center;
  gap: 20px;
}

.score-bar__group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.score-bar__icon {
  display: flex;
  color: var(--text-muted);
  opacity: 0.4;
  transition: all var(--duration-normal);
}

.score-bar__icon--active {
  color: var(--accent);
  opacity: 1;
  filter: drop-shadow(0 0 6px rgba(232, 184, 75, 0.5));
}

.score-bar__icon--muted {
  opacity: 0.3;
}

.score-bar__data {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.score-bar__label {
  font-size: 0.6rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
}

.score-bar__value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}

.score-bar__value--secondary {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.score-bar__combo {
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--accent);
  background: var(--accent-muted);
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  letter-spacing: 0.05em;
}

.score-bar__divider {
  width: 1px;
  height: 28px;
  background: var(--surface-border);
}

/* Bounce animation on streak increment */
.score-bar__value.is-bouncing {
  animation: bounce-in 0.35s var(--ease-spring);
}

@keyframes bounce-in {
  0%   { transform: scale(1.5); }
  100% { transform: scale(1); }
}

/* Combo flash */
.score-bar__combo.is-flashing {
  animation: combo-flash 0.5s ease-out;
}

@keyframes combo-flash {
  0%   { transform: scale(1.3); background: rgba(232, 184, 75, 0.3); }
  100% { transform: scale(1); background: var(--accent-muted); }
}

/* ===================================================================
   CARD — glassmorphism flashcard, fills available space
   =================================================================== */

.card {
  width: 100%;
  max-width: 600px;
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-xl);
  box-shadow:
    0 0 40px var(--card-glow),
    0 8px 32px rgba(0, 0, 0, 0.3);
  overflow: hidden;
  display: flex;
  flex-direction: column;

  /* Card entrance/exit transitions */
  opacity: 1;
  transform: translateY(0) scale(1);
  transition:
    opacity var(--duration-slow) var(--ease-out),
    transform var(--duration-slow) var(--ease-out);
}

.card--entering {
  opacity: 0;
  transform: translateY(20px) scale(0.97);
}

.card--exiting {
  opacity: 0;
  transform: translateY(-20px) scale(0.97);
  transition-duration: 250ms;
}

/* ===================================================================
   CARD BANNER — result feedback at top
   =================================================================== */

.card__banner {
  text-align: center;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: all 0.3s var(--ease-out);
}

.card__banner--visible {
  padding: 10px 16px;
  max-height: 50px;
  opacity: 1;
}

.card__banner--correct {
  background: var(--success-muted);
  color: var(--success);
}

.card__banner--wrong {
  background: var(--danger-muted);
  color: var(--danger);
}

/* ===================================================================
   CARD FIELDS — vertical layout, each field is a tappable row
   =================================================================== */

.card__fields {
  display: flex;
  flex-direction: column;
}

.card__field {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 14px 28px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: background var(--duration-fast);
  min-height: 56px;
  -webkit-tap-highlight-color: transparent;
  outline: none;
}

.card__field:last-child {
  border-bottom: none;
}

/* Clickable fields — tap to answer */
.card__field--clickable {
  cursor: pointer;
}

.card__field--clickable:hover {
  background: rgba(255, 255, 255, 0.03);
}

.card__field--clickable:active {
  background: transparent;
}

/* Hidden field — tap to answer */
.card__field--hidden:hover {
  background: rgba(255, 255, 255, 0.03);
}

/* Answered (filled) field — pale purple background */
.card__field--answered,
.card__field--answered:hover {
  background: var(--purple-muted);
}

/* Checked states */
.card__field--correct {
  background: var(--success-muted);
}

.card__field--wrong {
  background: var(--danger-muted);
}

/* ===================================================================
   CARD LABEL + VALUE — vertical hierarchy
   =================================================================== */

.card__label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 6px;
  line-height: 1;
}

.card__status {
  font-size: 0.72rem;
  font-weight: 700;
}

.card__status--correct { color: var(--success); }
.card__status--wrong   { color: var(--danger); }

.card__value {
  font-weight: 600;
  font-size: 1rem;
  line-height: 1.35;
  word-break: break-word;
}

/* Shown values — gold accent */
.card__value--shown {
  color: var(--accent);
}

/* User's guessed values (pre-check) — purple */
.card__value--answered {
  color: var(--purple);
}

/* After check: correct = green, wrong = red strikethrough */
.card__value--correct {
  color: var(--success);
}

.card__value--wrong {
  color: var(--danger);
  text-decoration: line-through;
  text-decoration-thickness: 2px;
}

/* Correct answer shown below wrong guess */
.card__value--correction {
  color: var(--success);
  opacity: 0.7;
  font-size: 0.9rem;
  margin-top: 2px;
}

/* Display size variants */
.card__value--rune {
  font-size: 2rem;
  line-height: 1;
}

.card__value--symbol {
  font-size: 1.6rem;
  line-height: 1;
  font-variant-emoji: text;
}

.card__value--long {
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* Answered purple overrides display-variant grays */
.card__value--long.card__value--answered,
.card__value--long.card__value--shown {
  color: var(--purple);
}

.card__value--long.card__value--shown {
  color: var(--accent);
}

/* Placeholder — shimmer animation */
.card__placeholder {
  font-size: 0.88rem;
  color: var(--text-muted);
  opacity: 0.5;
  animation: shimmer-pulse 2.5s ease-in-out infinite;
  user-select: none;
}

@keyframes shimmer-pulse {
  0%, 100% { opacity: 0.3; }
  50%      { opacity: 0.6; }
}

/* ===================================================================
   CARD ACTIONS — check / next buttons
   =================================================================== */

.card__actions {
  padding: 16px 28px 20px;
}

.card__action {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  height: 48px;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--duration-fast);
}

.card__action--ready {
  background: var(--accent-muted);
  border: 1px solid rgba(232, 184, 75, 0.25);
  color: var(--accent);
}

.card__action--ready:hover {
  background: rgba(232, 184, 75, 0.2);
  border-color: rgba(232, 184, 75, 0.4);
}

.card__action--ready:active {
  transform: scale(0.98);
}

.card__action--disabled {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--surface-border);
  color: var(--text-muted);
  opacity: 0.4;
  cursor: not-allowed;
}

/* Back to difficulty link */
.card__back {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 100%;
  padding: 10px;
  margin-top: 4px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 0.78rem;
  cursor: pointer;
  opacity: 0.5;
  transition: opacity var(--duration-fast);
}

.card__back:hover {
  opacity: 1;
}

/* ===================================================================
   DIFFICULTY PICKER
   =================================================================== */

.picker {
  text-align: center;
  width: 100%;
  max-width: 600px;
}

.picker__title {
  font-family: var(--font-h);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
}

.picker__stars {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.picker__star {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 16px 20px;
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--duration-fast);
  text-align: left;
}

.picker__star:hover {
  border-color: rgba(232, 184, 75, 0.25);
  background: rgba(232, 184, 75, 0.05);
  color: var(--accent);
}

.picker__star:active {
  transform: scale(0.98);
}

.picker__star-icons {
  display: flex;
  gap: 2px;
  color: var(--accent);
  flex-shrink: 0;
}

.picker__star-label {
  font-size: 0.78rem;
  font-weight: 500;
  color: inherit;
}

/* ===================================================================
   MODAL — bottom sheet (mobile) / centered (desktop)
   =================================================================== */

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0;
  opacity: 0;
  transition: opacity 0.25s var(--ease-out);
}

.modal-overlay.is-visible {
  opacity: 1;
}

.modal-overlay__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.modal {
  position: relative;
  z-index: 1;
  background: var(--bg-elevated);
  border: 1px solid var(--surface-border-strong);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  padding: 20px 24px 28px;
  width: 100%;
  max-width: 100%;
  max-height: 85dvh;
  overflow-y: auto;

  transform: translateY(20px);
  transition: transform 0.25s var(--ease-out);
}

.modal-overlay.is-visible .modal {
  transform: translateY(0);
}

.modal--compact {
  max-width: 360px;
}

/* Drag indicator (mobile affordance) */
.modal__drag-indicator {
  width: 36px;
  height: 4px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.15);
  margin: 0 auto 16px;
}

.modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.modal__title {
  font-family: var(--font-h);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}

.modal__close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--duration-fast);
}

.modal__close:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

/* Option grids */
.modal__grid {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.modal__grid--symbols {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(64px, 1fr));
  gap: 8px;
}

.modal__grid--text {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.modal__grid--long {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* Option buttons */
.modal__option {
  padding: 12px 16px;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  transition: all 0.1s;
  min-height: 44px;
  display: flex;
  align-items: center;
}

.modal__option:hover {
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--surface-border-strong);
}

.modal__option--symbol,
.modal__option--rune {
  justify-content: center;
  text-align: center;
  font-size: 1.6rem;
  padding: 14px 8px;
  min-height: 56px;
  font-variant-emoji: text;
}

.modal__option--rune {
  font-size: 2rem;
}

/* Active state — brief flash on pick */
.modal__option:active {
  background: rgba(232, 184, 75, 0.1);
  border-color: var(--accent);
}

/* Number input modal */
.modal__number {
  display: flex;
  gap: 8px;
}

.modal__input {
  flex: 1;
  padding: 12px 16px;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  background: rgba(0, 0, 0, 0.3);
  color: var(--text);
  font-family: var(--font);
  font-size: 1.2rem;
  text-align: center;
  outline: none;
  min-height: 48px;
  -moz-appearance: textfield;
}

.modal__input::-webkit-outer-spin-button,
.modal__input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.modal__input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-muted);
}

.modal__error {
  font-size: 0.78rem;
  color: var(--danger);
  text-align: center;
  min-height: 1.2em;
  margin-top: 8px;
}

.modal__submit {
  flex-shrink: 0;
}

/* ===================================================================
   BUTTONS
   =================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--duration-fast);
}

.btn:disabled {
  opacity: 0.4;
  cursor: default;
}

.btn--primary {
  background: var(--accent);
  color: #111;
}

.btn--primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn--primary:active:not(:disabled) {
  transform: scale(0.97);
}

/* ===================================================================
   GAME TITLE (legacy support, hidden in new shell)
   =================================================================== */

#game-title {
  display: none;
}

/* ===================================================================
   ERROR MESSAGE
   =================================================================== */

.error-message {
  color: var(--danger);
  padding: 2rem;
  text-align: center;
}

/* ===================================================================
   ANIMATIONS
   =================================================================== */

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%      { transform: translateX(-6px); }
  40%      { transform: translateX(6px); }
  60%      { transform: translateX(-4px); }
  80%      { transform: translateX(4px); }
}

/* ===================================================================
   DESKTOP — modal centered, bigger card padding
   =================================================================== */

@media (min-width: 640px) {
  .modal-overlay {
    align-items: center;
    padding: 24px;
  }

  .modal {
    border-radius: var(--radius-xl);
    max-width: 480px;
  }

  .modal--compact {
    max-width: 360px;
  }

  .modal__drag-indicator {
    display: none;
  }

  .card__field {
    padding: 16px 36px;
  }

  .card__actions {
    padding: 20px 36px 24px;
  }

  .card__value {
    font-size: 1.05rem;
  }
}

/* ===================================================================
   DONATION INTERSTITIAL
   =================================================================== */

.donation-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  transition: opacity 0.3s var(--ease-out);
}

.donation-overlay.is-visible {
  opacity: 1;
}

.donation-overlay__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.donation {
  position: relative;
  z-index: 1;
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-xl);
  padding: 40px 32px 24px;
  max-width: 380px;
  width: 100%;
  text-align: center;
  box-shadow:
    0 0 60px rgba(232, 184, 75, 0.08),
    0 8px 32px rgba(0, 0, 0, 0.4);
  transform: scale(0.95) translateY(10px);
  transition: transform 0.3s var(--ease-spring);
}

.donation-overlay.is-visible .donation {
  transform: scale(1) translateY(0);
}

.donation__heart {
  color: var(--accent);
  margin-bottom: 16px;
  filter: drop-shadow(0 0 12px rgba(232, 184, 75, 0.4));
  animation: heart-pulse 1.5s ease-in-out infinite;
}

@keyframes heart-pulse {
  0%, 100% { transform: scale(1); }
  50%      { transform: scale(1.1); }
}

.donation__message {
  font-family: var(--font-h);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.5;
  margin-bottom: 24px;
  white-space: pre-line;
}

.donation__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 48px;
  padding: 0 32px;
  background: var(--accent);
  color: #111;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font);
  font-size: 0.92rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--duration-fast);
}

.donation__cta:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.donation__cta:active {
  transform: scale(0.97);
}

.donation__close {
  position: absolute;
  top: 10px;
  right: 10px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  padding: 4px 8px;
  opacity: 0.5;
  transition: opacity var(--duration-fast);
}

.donation__close:hover {
  opacity: 1;
}

/* ===================================================================
   REDUCED MOTION
   =================================================================== */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .card--entering,
  .card--exiting {
    opacity: 1;
    transform: none;
  }
}