/* ===================================================
   GAME — Shared game styles
   Requires --game-color to be
   defined on :root by each game's HTML <style> block.
   =================================================== */

/* ─── Layout ─────────────────────────────────────── */
html, body {
  height: 100%;
  overflow: hidden;
}

body {
  display: flex;
  flex-direction: column;
}

/* ─── Status Bar ─────────────────────────────────── */
.status-bar {
  position: relative;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-lg);
  flex-shrink: 0;
}

.back-link {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-ink-2);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: var(--radius-full);
  box-shadow: inset 0 0 0 2px var(--pop-line);
  transition:
    color var(--transition-fast),
    box-shadow var(--transition-fast),
    transform var(--transition-fast);
  white-space: nowrap;
}

.back-link:hover {
  color: var(--game-color);
  box-shadow: inset 0 0 0 2px var(--game-color);
  transform: translateX(-2px);
}

.status-center {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.timer-icon {
  display: none;
}

.timer {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.3rem;
  color: var(--game-color);
  letter-spacing: 0.03em;
  min-width: 4.5ch;
  padding: 2px 14px;
  border: 2px solid currentColor;
  border-radius: var(--radius-full);
  text-align: center;
  font-variant-numeric: tabular-nums;
  transition: color var(--transition-fast);
}

.timer.expired {
  color: var(--color-error);
  animation: timer-pulse 1s ease-in-out infinite;
}

@keyframes timer-pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}

/* ─── Score ──────────────────────────────────────── */
.score-area {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.score {
  display: flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.92rem;
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

.score-icon {
  font-size: 0.95rem;
  line-height: 1;
}

.score-value {
  min-width: 2ch;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.score--correct {
  color: var(--color-success);
  background: color-mix(in srgb, var(--color-success) 10%, transparent);
}

.score--incorrect {
  color: var(--color-error);
  background: color-mix(in srgb, var(--color-error) 10%, transparent);
}

.score-sep {
  width: 1px;
  height: 20px;
  background: var(--color-line);
}

.status-bar .help-button {
  margin-left: -4px;
}

/* ─── Game Area ──────────────────────────────────── */
.game-area {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  position: relative;
  z-index: 1;
  overflow: hidden;
}

/* ─── Game Card ──────────────────────────────────── */
.game-card {
  width: 100%;
  max-width: 620px;
  background: var(--color-paper-raised);
  border: 2px solid var(--pop-line);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
  position: relative;
  overflow: hidden;
  animation: card-enter var(--transition-slow) forwards;
}

.session-summary {
  width: 100%;
  text-align: center;
}

.session-summary h1 {
  margin: 0 0 var(--space-sm);
  color: var(--color-ink);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.6rem, 6vw, 2.1rem);
}

.session-summary > p {
  max-width: 420px;
  margin: 0 auto var(--space-lg);
  color: var(--color-ink-2);
  font-weight: 500;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

.summary-grid > div {
  display: flex;
  flex-direction: column;
  padding: var(--space-md) var(--space-xs);
  border-radius: var(--radius-md);
  background: var(--color-paper-sunken);
}

.summary-grid strong {
  color: var(--color-ink);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.5rem;
  font-variant-numeric: normal;
}

.summary-grid span {
  color: var(--color-ink-3);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.summary-actions {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.summary-home {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: inset 0 0 0 1.5px var(--color-line);
  color: var(--color-ink);
  text-decoration: none;
  background: transparent;
}

@media (max-width: 600px) {
  .summary-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .status-bar {
    gap: 6px;
    padding-inline: 8px;
  }

  .score {
    padding-inline: 6px;
  }
}

@keyframes card-enter {
  from { opacity: 0; transform: scale(0.96) translateY(10px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

/* ─── Question ───────────────────────────────────── */
.question-wrap {
  position: relative;
  overflow: hidden;
  width: 100%;
  text-align: center;
  padding: var(--space-xl) var(--space-md);
  background: var(--game-color);
  border: 2px solid var(--pop-line);
  border-radius: var(--radius-lg);
}

/* The operation, drawn huge behind the equation and cropped by the panel. */
.question-wrap::before {
  content: var(--game-glyph, "");
  position: absolute;
  right: -0.08em;
  bottom: -0.3em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 16rem;
  line-height: 1;
  color: color-mix(in srgb, var(--color-on-accent) 18%, transparent);
  pointer-events: none;
}

.question {
  z-index: 1;
  font-family: var(--font-display);
  font-weight: 700;
  position: relative;
  font-size: clamp(3rem, 10vw, 5.5rem);
  line-height: 1;
  color: var(--color-on-accent);
  letter-spacing: -0.02em;
  font-variant-numeric: normal;
  transition: transform var(--transition-med), opacity var(--transition-fast);
  animation: question-pop 0.3s cubic-bezier(0.2, 0.7, 0.3, 1) forwards;
}

/* Same weight signal as the Progress grid: the equation firms up as the
   fact does. */
.question[data-mastery="none"]     { font-weight: var(--weight-none); }
.question[data-mastery="learning"] { font-weight: var(--weight-learning); }
.question[data-mastery="review"]   { font-weight: var(--weight-due); }
.question[data-mastery="learned"]  { font-weight: var(--weight-mastered); }

@keyframes question-pop {
  from { opacity: 0; transform: scale(0.85); }
  to   { opacity: 1; transform: scale(1); }
}

/* ─── Answer Input ───────────────────────────────── */
.input-wrap {
  width: 100%;
  display: flex;
  justify-content: center;
}

.answer-input {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 7vw, 3.5rem);
  font-weight: 600;
  color: var(--color-ink);
  text-align: center;
  width: 100%;
  max-width: 280px;
  padding: 18px 24px;
  border-radius: var(--radius-lg);
  border: 2px solid var(--pop-line);
  background: var(--color-paper);
  outline: none;
  font-variant-numeric: normal;
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background var(--transition-fast);
  -moz-appearance: textfield;
  appearance: textfield;
  caret-color: var(--game-color);
}

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

.answer-input::placeholder {
  color: var(--color-ink-3);
  opacity: 0.7;
}

.answer-input:focus {
  border-color: var(--pop-line);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--game-color) 22%, transparent);
}

.answer-input.correct {
  border-color: var(--color-success);
  background: color-mix(in srgb, var(--color-success) 8%, var(--color-paper));
  color: var(--color-success);
}

.answer-input.incorrect {
  border-color: var(--color-error);
  background: color-mix(in srgb, var(--color-error) 8%, var(--color-paper));
  color: var(--color-error);
  animation: shake 0.4s cubic-bezier(0.36, 0.07, 0.19, 0.97) forwards;
}

@keyframes shake {
  0%  { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-5px); }
  80% { transform: translateX(5px); }
  100% { transform: translateX(0); }
}

/* ─── Feedback ───────────────────────────────────── */
.feedback {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  text-align: center;
  min-height: 2em;
  opacity: 0;
  transform: translateY(6px);
  transition:
    opacity var(--transition-fast),
    transform var(--transition-fast);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-lg);
  width: 100%;
}

.feedback.visible {
  opacity: 1;
  transform: translateY(0);
  animation: feedback-pop 0.25s cubic-bezier(0.2, 0.7, 0.3, 1) forwards;
}

@keyframes feedback-pop {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.feedback.success {
  color: var(--color-success);
  background: color-mix(in srgb, var(--color-success) 10%, transparent);
}

.feedback.error {
  color: var(--color-error);
  background: color-mix(in srgb, var(--color-error) 10%, transparent);
}

/* ─── Buttons ────────────────────────────────────── */
.btn-row {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.btn-check {
  font-size: 1.1rem;
  padding: 16px 40px;
  min-width: 200px;
  background: var(--game-color);
}

.btn-check:hover:not(:disabled) {
  background: var(--game-color);
  filter: brightness(0.92);
}

.btn-next {
  background: var(--color-paper-raised);
  color: var(--color-ink);
  border: 2px solid var(--pop-line);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  min-width: 200px;
  display: none;
  opacity: 0;
  transform: translateY(6px);
  cursor: pointer;
  transition:
    opacity var(--transition-med),
    transform var(--transition-med),
    background var(--transition-fast),
    color var(--transition-fast);
}

.btn-next.visible {
  display: flex !important;
  opacity: 1;
  transform: translateY(0);
  animation: btn-slide-up 0.25s cubic-bezier(0.2, 0.7, 0.3, 1) forwards;
}

@keyframes btn-slide-up {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.btn-next:hover:not(:disabled) {
  background: var(--game-color);
  color: var(--color-on-accent);
}

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

/* ─── Responsive ─────────────────────────────────── */
@media (max-width: 600px) {
  .status-bar {
    padding: var(--space-xs) var(--space-md);
  }

  .back-link {
    font-size: 0.8rem;
    padding: 5px 10px;
  }

  .timer {
    font-size: 1rem;
    min-width: 0;
    padding: 1px 8px;
  }

  .score {
    font-size: 0.82rem;
    padding: 3px 6px;
    gap: 2px;
  }

  .score-value { min-width: 1ch; }

  .game-area {
    padding: var(--space-md);
    align-items: flex-start;
    padding-top: var(--space-lg);
  }

  .game-card {
    padding: var(--space-lg) var(--space-md) var(--space-md);
    gap: var(--space-md);
  }

  .question {
    font-size: clamp(2.5rem, 13vw, 4rem);
  }

  .question-wrap {
    padding: var(--space-lg) var(--space-sm);
  }

  .question-wrap::before {
    font-size: 10rem;
  }

  .answer-input {
    font-size: clamp(2rem, 10vw, 3rem);
    padding: 16px 20px;
  }

  .btn-check {
    font-size: 1.05rem;
    padding: 16px 32px;
  }
}

@media (max-width: 480px) {
  .score-sep { display: none; }
}