:root {
  --sky-top: #dbeafe;
  --sky-bottom: #fef3c7;
  --panel-bg: rgba(255, 255, 255, 0.92);
  --ink: #0f172a;
  --muted: #475569;
  --border-soft: #bfdbfe;
  --shadow-lg: 0 12px 30px rgba(15, 23, 42, 0.12);
  --radius-lg: 22px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  font-family: "Nunito", "Verdana", "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at top left, #e0f2fe 0%, transparent 45%),
              radial-gradient(circle at top right, #fce7f3 0%, transparent 40%),
              linear-gradient(180deg, var(--sky-top) 0%, var(--sky-bottom) 100%);
  background-attachment: fixed;
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent;
}

#explosion-canvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 50;
}

.app-shell {
  max-width: 1120px;
  margin: 0 auto;
  padding: 1rem 1.25rem 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: relative;
  z-index: 1;
}

.top-bar {
  background: var(--panel-bg);
  border: 3px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 0.85rem 1.15rem;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.9rem;
}

.top-left {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 0.85rem;
  border-radius: 12px;
  background: #f1f5f9;
  color: #334155;
  text-decoration: none;
  font-weight: 800;
  font-size: 0.95rem;
  border: 2px solid #cbd5e1;
  transition: background 0.15s ease, transform 0.1s ease;
}

.back-link:hover {
  background: #e2e8f0;
}

.game-title {
  margin: 0;
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  font-weight: 900;
  color: #1e293b;
  letter-spacing: -0.01em;
}

.hud-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
}

.stat-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  font-weight: 800;
  border: 2px solid transparent;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--muted);
}

.stat-value {
  font-size: 1.15rem;
  font-weight: 900;
}

.stat-score {
  background: #fef9c3;
  border-color: #fde047;
  color: #854d0e;
}

.stat-wall {
  background: #e0f2fe;
  border-color: #7dd3fc;
  color: #075985;
}

.stat-streak {
  background: #dcfce7;
  border-color: #86efac;
  color: #166534;
}

.start-control {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  background: #f8fafc;
  border: 2px solid #cbd5e1;
  border-radius: 14px;
  padding: 0.25rem 0.5rem;
  font-weight: 800;
  font-size: 0.9rem;
}

.start-control label {
  color: #334155;
  margin-right: 0.15rem;
}

.start-control input[type="number"] {
  width: 2.6rem;
  text-align: center;
  font-size: 1rem;
  font-weight: 900;
  border: none;
  background: transparent;
  color: #0f172a;
  font-family: inherit;
  -moz-appearance: textfield;
}

.start-control input[type="number"]::-webkit-outer-spin-button,
.start-control input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.stepper-btn {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  border: 2px solid #cbd5e1;
  background: #ffffff;
  color: #0f172a;
  font-size: 1.05rem;
  font-weight: 900;
  line-height: 1;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.stepper-btn:hover {
  background: #e2e8f0;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 0.9rem;
  border-radius: 14px;
  border: 2px solid #cbd5e1;
  background: #ffffff;
  color: #1e293b;
  font-family: inherit;
  font-weight: 800;
  font-size: 0.95rem;
  cursor: pointer;
}

.icon-btn:hover {
  background: #f1f5f9;
}

.settings-panel {
  background: var(--panel-bg);
  border: 3px solid #ddd6fe;
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  box-shadow: var(--shadow-lg);
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 1rem;
  align-items: end;
}

.setting-item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.setting-item label {
  font-size: 0.88rem;
  font-weight: 800;
  color: #334155;
}

.setting-item select,
.setting-item input[type="number"],
.setting-item input[type="text"] {
  padding: 0.5rem 0.7rem;
  border-radius: 12px;
  border: 2px solid #cbd5e1;
  font-family: inherit;
  font-size: 0.98rem;
  font-weight: 700;
  color: #0f172a;
  background: #ffffff;
}

.setting-checkbox {
  justify-content: center;
  padding-bottom: 0.45rem;
}

.setting-checkbox label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.98rem;
  cursor: pointer;
}

.setting-checkbox input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: #2563eb;
}

.setting-custom {
  grid-column: 1 / -1;
}

.custom-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.custom-row input {
  flex: 1 1 260px;
}

.apply-btn {
  padding: 0.55rem 1rem;
  border-radius: 12px;
  border: none;
  background: #2563eb;
  color: #ffffff;
  font-family: inherit;
  font-weight: 800;
  cursor: pointer;
}

.apply-btn:hover {
  background: #1d4ed8;
}

.prompt-banner {
  background: var(--panel-bg);
  border: 3px solid #fde68a;
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.speak-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  background: linear-gradient(180deg, #38bdf8 0%, #0284c7 100%);
  color: #ffffff;
  border: none;
  border-radius: 18px;
  padding: 0.9rem 1.5rem;
  font-family: inherit;
  font-size: 1.25rem;
  font-weight: 900;
  cursor: pointer;
  box-shadow: 0 5px 0 #0369a1, 0 8px 18px rgba(2, 132, 199, 0.25);
  transition: transform 0.1s ease, box-shadow 0.1s ease;
}

.speak-btn:hover {
  filter: brightness(1.06);
}

.speak-btn:active {
  transform: translateY(3px);
  box-shadow: 0 2px 0 #0369a1;
}

.speak-btn.speaking {
  animation: pulseSpeak 0.55s ease-in-out;
}

.speak-icon {
  font-size: 1.45rem;
}

.prompt-message-wrap {
  flex: 1 1 240px;
  text-align: center;
}

.prompt-text {
  margin: 0;
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  font-weight: 900;
  color: #1e293b;
}

.prompt-text.celebrate {
  color: #15803d;
}

.prompt-text.encourage {
  color: #b45309;
}

.hint-word {
  margin: 0.25rem 0 0;
  font-size: 1.15rem;
  font-weight: 900;
  color: #2563eb;
  letter-spacing: 0.03em;
}

.prompt-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.secondary-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 1.05rem;
  border-radius: 14px;
  border: 2px solid #cbd5e1;
  background: #f8fafc;
  color: #1e293b;
  font-family: inherit;
  font-weight: 800;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease;
}

.secondary-btn:hover {
  background: #e2e8f0;
}

.secondary-btn:active {
  transform: translateY(2px);
}

.wall-stage {
  background: rgba(255, 255, 255, 0.55);
  border: 4px solid rgba(255, 255, 255, 0.85);
  border-radius: 28px;
  padding: clamp(1rem, 3vw, 1.75rem);
  box-shadow: var(--shadow-lg);
  min-height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.word-wall {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(155px, 1fr));
  gap: 1.05rem;
  align-items: stretch;
}

.word-card {
  position: relative;
  min-height: 88px;
  padding: 0.85rem 1rem;
  border-radius: 20px;
  border: 3px solid rgba(15, 23, 42, 0.12);
  font-family: "Andika", "Verdana", "Trebuchet MS", sans-serif;
  font-size: clamp(1.55rem, 3.2vw, 2.25rem);
  font-weight: 800;
  letter-spacing: 0.02em;
  color: #0f172a;
  cursor: pointer;
  user-select: none;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  box-shadow: 0 7px 0 rgba(15, 23, 42, 0.16), 0 10px 18px rgba(15, 23, 42, 0.1);
  transition: transform 0.16s ease, box-shadow 0.16s ease, opacity 0.25s ease, filter 0.25s ease;
}

.word-card:hover:not(.dimmed):not(.exploding) {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 10px 0 rgba(15, 23, 42, 0.16), 0 14px 22px rgba(15, 23, 42, 0.14);
}

.word-card:active:not(.dimmed):not(.exploding) {
  transform: translateY(3px) scale(0.98);
  box-shadow: 0 3px 0 rgba(15, 23, 42, 0.16);
}

.word-card:focus-visible {
  outline: 4px solid #2563eb;
  outline-offset: 3px;
}

/* Tactile playful brick color palette with high text contrast */
.word-card.color-0 { background: linear-gradient(180deg, #fef08a 0%, #facc15 100%); border-color: #eab308; }
.word-card.color-1 { background: linear-gradient(180deg, #bae6fd 0%, #38bdf8 100%); border-color: #0284c7; }
.word-card.color-2 { background: linear-gradient(180deg, #bbf7d0 0%, #4ade80 100%); border-color: #16a34a; }
.word-card.color-3 { background: linear-gradient(180deg, #fbcfe8 0%, #f472b6 100%); border-color: #db2777; }
.word-card.color-4 { background: linear-gradient(180deg, #fed7aa 0%, #fb923c 100%); border-color: #ea580c; }
.word-card.color-5 { background: linear-gradient(180deg, #ddd6fe 0%, #a78bfa 100%); border-color: #7c3aed; }
.word-card.color-6 { background: linear-gradient(180deg, #99f6e4 0%, #2dd4bf 100%); border-color: #0d9488; }
.word-card.color-7 { background: linear-gradient(180deg, #fecaca 0%, #f87171 100%); border-color: #dc2626; }

.word-card.card-enter {
  animation: cardEnter 0.35s cubic-bezier(0.22, 1.35, 0.36, 1) both;
}

.word-card.dimmed {
  opacity: 0.22;
  filter: grayscale(75%);
  transform: scale(0.94);
  box-shadow: 0 2px 0 rgba(15, 23, 42, 0.08);
  pointer-events: none;
}

.word-card.wrong-shake {
  animation: wrongShake 0.42s ease-in-out;
}

.word-card.exploding {
  pointer-events: none;
  z-index: 20;
  animation: explodeCard 0.65s cubic-bezier(0.18, 0.89, 0.32, 1.28) forwards;
}

@keyframes cardEnter {
  0% {
    opacity: 0;
    transform: scale(0.75) translateY(10px);
  }
  100% {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

@keyframes wrongShake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px) rotate(-2deg); }
  40% { transform: translateX(8px) rotate(2deg); }
  60% { transform: translateX(-6px) rotate(-1deg); }
  80% { transform: translateX(6px) rotate(1deg); }
}

@keyframes explodeCard {
  0% {
    transform: scale(1);
    opacity: 1;
    filter: brightness(1);
  }
  30% {
    transform: scale(1.26) rotate(-3deg);
    opacity: 1;
    filter: brightness(1.45);
    box-shadow: 0 0 36px rgba(250, 204, 21, 0.95);
  }
  100% {
    transform: scale(1.65) rotate(6deg);
    opacity: 0;
    filter: brightness(1.8);
  }
}

@keyframes pulseSpeak {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.06); }
}

@media (max-width: 640px) {
  .app-shell {
    padding: 0.75rem 0.75rem 2rem;
  }

  .word-wall {
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 0.8rem;
  }

  .word-card {
    min-height: 76px;
  }

  .prompt-banner {
    justify-content: center;
    text-align: center;
  }

  .speak-btn {
    width: 100%;
  }
}