@import url('https://fonts.googleapis.com/css2?family=Fredoka+One&family=Share+Tech+Mono&display=swap');

:root {
  --bg: #05070f;
  --surface: rgba(17, 22, 40, 0.92);
  --surface-alt: rgba(11, 16, 34, 0.88);
  --accent: #64ffda;
  --accent-dark: #1ea38a;
  --danger: #ff4d6d;
  --text: #f5f8ff;
  --subtle: rgba(245, 248, 255, 0.65);
  --border: rgba(100, 255, 218, 0.25);
  --shadow: 0 18px 38px rgba(3, 8, 24, 0.45);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Share Tech Mono', 'Helvetica Neue', sans-serif;
  background: radial-gradient(120% 120% at 50% 0%, rgba(100, 255, 218, 0.15) 0%, rgba(5, 7, 15, 0.95) 65%), var(--bg);
  color: var(--text);
  display: flex;
  justify-content: center;
  min-height: 100vh;
  padding: 28px 12px 24px;
}

.game-shell {
  width: min(480px, 100%);
  background: var(--surface);
  border-radius: 22px;
  padding: 24px 18px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.game-header {
  display: flex;
  flex-direction: column;
  gap: 14px;
  text-align: center;
}

.title {
  margin: 0;
  font-family: 'Fredoka One', cursive;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: clamp(1.9rem, 8vw, 2.6rem);
  color: var(--accent);
  text-shadow: 0 12px 22px rgba(0, 0, 0, 0.5);
}

.controls {
  display: flex;
  justify-content: center;
}

.difficulty-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--subtle);
}

.difficulty-select {
  padding: 8px 14px;
  border-radius: 999px;
  border: none;
  background: linear-gradient(135deg, #ff6ec7, #ffcc70, #60efff, #ff6ec7);
  background-size: 300%;
  color: #06121a;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  box-shadow: 0 12px 20px rgba(6, 18, 32, 0.35);
  animation: hueShift 8s ease infinite;
}

.status-panel {
  display: flex;
  justify-content: center;
}

.timer {
  width: min(88vw, 210px);
  min-height: 52px;
  background: var(--surface-alt);
  border-radius: 10px;
  padding: 8px 12px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  border: 1px solid var(--border);
  box-shadow: inset 0 0 18px rgba(100, 255, 218, 0.22);
}

.timer-label,
.timer-unit {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--subtle);
}

.timer-value {
  font-size: clamp(1.7rem, 8.5vw, 2.3rem);
  font-weight: 700;
  font-family: 'Share Tech Mono', monospace;
}

.card-stage {
  background: var(--surface-alt);
  border-radius: 16px;
  padding: 12px;
  border: 1px solid var(--border);
}

.card-display {
  display: grid;
  grid-template-columns: repeat(3, minmax(54px, 1fr));
  gap: 6px;
  justify-items: center;
}

.card {
  width: 100%;
  aspect-ratio: 3 / 4;
  max-width: 74px;
  border-radius: 9px;
  background: linear-gradient(145deg, rgba(30, 44, 84, 0.95), rgba(18, 28, 60, 0.95));
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  font-size: clamp(1.4rem, 7vw, 1.9rem);
  color: var(--text);
  text-shadow: 0 10px 20px rgba(0, 0, 0, 0.5);
}

.card.covered {
  color: transparent;
  position: relative;
}

.card.covered::after {
  content: '✦';
  color: var(--accent);
  font-size: 1.6rem;
  position: absolute;
}

#message {
  margin: 0;
  font-size: 1rem;
  letter-spacing: 0.05em;
  color: var(--subtle);
}

.choice-panel {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px 12px;
}

.choices {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(52px, 1fr));
  gap: 6px;
}

.choice-btn {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: linear-gradient(145deg, rgba(20, 30, 66, 0.95), rgba(12, 20, 50, 0.95));
  color: var(--text);
  font-size: clamp(1.3rem, 6.5vw, 1.7rem);
}

.choice-btn::after {
  content: attr(data-result);
  position: absolute;
  left: 50%;
  bottom: 4px;
  transform: translateX(-50%);
  font-size: 1rem;
  letter-spacing: 0.08em;
  color: var(--accent);
  display: none;
}

.choice-btn.choice-success::after,
.choice-btn.choice-fail::after {
  display: block;
}

.choice-btn.choice-fail::after {
  color: var(--danger);
}

.choice-btn:disabled {
  opacity: 0.6;
}

.history-panel {
  text-align: center;
  display: grid;
  gap: 10px;
}

.history-title {
  margin: 0;
  font-size: 0.9rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--subtle);
}

.selection-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
}

.selection-chip {
  min-width: 44px;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(15, 22, 46, 0.9);
  border: 1px solid var(--border);
  font-size: 1.1rem;
}

.score-panel {
  display: flex;
  justify-content: center;
  gap: 18px;
  font-size: 0.95rem;
  color: var(--subtle);
}

.score-item span {
  color: var(--accent);
  font-size: 1.2rem;
  margin-left: 4px;
}

.action-panel {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.action-btn {
  width: 100%;
  padding: 10px;
  border-radius: 999px;
  border: none;
  background: var(--accent);
  color: #001d15;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.action-btn--danger {
  background: linear-gradient(135deg, #ff758c, #ff4d6d);
  color: #1a0108;
}

.action-btn.hidden {
  display: none;
}

/* Popups */
.status-popup,
.start-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  backdrop-filter: blur(8px);
  background: rgba(5, 7, 15, 0.8);
  z-index: 200;
  padding: 24px;
}

.status-popup.hidden,
.start-overlay.hidden {
  display: none;
}

.status-text {
  font-family: 'Fredoka One', cursive;
  font-size: clamp(1.6rem, 6vw, 2.6rem);
  text-align: center;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 24px;
}

.status-actions {
  display: flex;
  flex-direction: row;
  justify-content: center;
  gap: 12px;
  width: 100%;
  margin-top: 16px;
}

.status-actions .popup-btn {
  flex: 1 1 140px;
  padding: 12px 16px;
  border-radius: 999px;
  background: var(--accent);
  border: none;
  letter-spacing: 0.1em;
  font-size: 0.9rem;
}

.popup-btn.share {
  background: linear-gradient(135deg, #f6d365, #fda085);
}

@keyframes hueShift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

.start-dialog {
  background: var(--surface);
  padding: 26px 20px;
  border-radius: 18px;
  text-align: center;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  width: min(420px, 100%);
  display: grid;
  gap: 16px;
}

.start-title {
  margin: 0;
  font-family: 'Fredoka One', cursive;
  font-size: 1.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.start-description {
  margin: 0;
  color: var(--subtle);
  font-size: 0.95rem;
  line-height: 1.6;
}

.start-description b {
  color: var(--accent);
}

.start-btn {
  padding: 12px;
  border-radius: 999px;
  background: var(--accent);
  border: none;
  color: #011b11;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

@media (min-width: 640px) {
  body {
    padding: 40px;
  }

  .game-shell {
    gap: 22px;
    padding: 32px 28px;
    width: min(640px, 100%);
  }

  .card-display {
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
  }

  .choice-panel {
    padding: 20px;
  }

  .choices {
    gap: 12px;
  }

  .choice-btn {
    font-size: 2.2rem;
  }
}