/* ===== RESET & BASE ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --pink: #ff2d78;
  --pink-glow: rgba(255, 45, 120, 0.5);
  --cyan: #00e5ff;
  --cyan-glow: rgba(0, 229, 255, 0.5);
  --bg-dark: #0a0a0f;
  --bg-card: #141420;
  --bg-surface: #1a1a2e;
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --gold: #ffd700;
  --board-gap: 3px;
}

html {
  font-size: 16px;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: 'Noto Sans JP', sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  user-select: none;
  -webkit-user-select: none;
}

/* ===== SCREENS ===== */
.screen {
  display: none;
  min-height: 100vh;
  padding: 16px;
}
.screen.active {
  display: flex;
  align-items: center;
  justify-content: center;
}

.container {
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 1;
}

/* ===== TITLES ===== */
.main-title {
  margin-bottom: 12px;
}
.brand, .brand-sm {
  font-family: 'Orbitron', sans-serif;
  background: linear-gradient(135deg, var(--pink), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
}
.brand {
  font-size: clamp(1.8rem, 6vw, 2.8rem);
  font-weight: 900;
  letter-spacing: 2px;
  filter: drop-shadow(0 0 20px var(--pink-glow));
}
.brand-sm {
  font-size: 1rem;
  font-weight: 700;
  display: inline;
}
.subtitle {
  font-size: clamp(1rem, 3.5vw, 1.5rem);
  font-weight: 700;
  color: var(--text-primary);
  display: block;
  margin-top: 4px;
}
.game-title {
  font-size: 1rem;
  font-weight: 700;
}

/* ===== BILINGUAL ENGLISH SUB-TEXT ===== */
.subtitle-en {
  display: block;
  font-size: clamp(0.7rem, 2.2vw, 0.95rem);
  font-weight: 400;
  color: var(--text-secondary);
  margin-top: 2px;
  letter-spacing: 1px;
}
.desc-en {
  display: block;
  font-size: 0.8em;
  color: var(--text-secondary);
  opacity: 0.7;
  margin-top: 2px;
}
.label-en {
  font-size: 0.85em;
  font-weight: 400;
  color: var(--text-secondary);
  opacity: 0.7;
}
.title-en {
  font-size: 0.8em;
  font-weight: 400;
  color: var(--text-secondary);
  opacity: 0.7;
}
.btn-en {
  display: block;
  font-size: 0.75em;
  font-weight: 400;
  color: rgba(255, 255, 255, 0.7);
  margin-top: 2px;
}
.diff-name-en {
  display: block;
  font-size: 0.8em;
  font-weight: 400;
  opacity: 0.7;
  margin-top: 1px;
  font-family: 'Orbitron', sans-serif;
}
.complete-title-en {
  display: block;
  font-size: 0.55em;
  font-weight: 400;
  -webkit-text-fill-color: var(--text-secondary);
  opacity: 0.8;
  margin-top: 4px;
}

.start-visual {
  font-size: 4rem;
  margin: 16px 0;
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.description {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 24px;
}

/* ===== DIFFICULTY SELECT ===== */
.difficulty-select {
  margin-bottom: 24px;
}
.difficulty-select h2 {
  font-size: 1rem;
  margin-bottom: 12px;
  color: var(--cyan);
}
.difficulty-buttons {
  display: flex;
  gap: 8px;
  justify-content: center;
}
.btn-difficulty {
  flex: 1;
  max-width: 140px;
  padding: 12px 8px;
  background: var(--bg-surface);
  border: 2px solid transparent;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.3s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  color: var(--text-primary);
}
.btn-difficulty:hover {
  border-color: var(--cyan);
  background: rgba(0, 229, 255, 0.1);
}
.btn-difficulty.selected {
  border-color: var(--pink);
  background: rgba(255, 45, 120, 0.15);
  box-shadow: 0 0 15px var(--pink-glow);
}
.diff-name {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--cyan);
}
.btn-difficulty.selected .diff-name {
  color: var(--pink);
}
.diff-grid {
  font-size: 1.3rem;
  font-weight: 900;
}
.diff-desc {
  font-size: 0.7rem;
  color: var(--text-secondary);
}

/* ===== BUTTONS ===== */
.btn {
  border: none;
  border-radius: 12px;
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.3s;
  padding: 12px 24px;
  font-size: 1rem;
}
.btn-primary {
  background: linear-gradient(135deg, var(--pink), #ff6b9d);
  color: white;
  box-shadow: 0 4px 15px var(--pink-glow);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px var(--pink-glow);
}
.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid rgba(255, 255, 255, 0.1);
}
.btn-secondary:hover {
  background: rgba(0, 229, 255, 0.15);
  border-color: var(--cyan);
}
.btn-large {
  padding: 16px 48px;
  font-size: 1.2rem;
  width: 100%;
  max-width: 320px;
}
.pulse {
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 4px 15px var(--pink-glow); }
  50% { box-shadow: 0 4px 30px var(--pink-glow), 0 0 50px rgba(255, 45, 120, 0.3); }
}

/* ===== GAME HEADER ===== */
.game-header {
  margin-bottom: 12px;
}
.game-stats {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 8px;
}
.stat {
  background: var(--bg-surface);
  border-radius: 8px;
  padding: 6px 14px;
  border: 1px solid rgba(255, 255, 255, 0.05);
}
.stat-label {
  font-size: 0.7rem;
  color: var(--text-secondary);
  display: block;
}
.stat-value {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--cyan);
}
#difficulty-label {
  font-size: 0.75rem;
}

/* ===== GAME AREA ===== */
.game-area {
  display: flex;
  gap: 16px;
  justify-content: center;
  align-items: flex-start;
  flex-wrap: wrap;
}

/* ===== PUZZLE BOARD ===== */
.puzzle-board {
  width: min(85vw, 400px);
  height: min(85vw, 400px);
  display: grid;
  gap: var(--board-gap);
  background: var(--bg-surface);
  border-radius: 12px;
  padding: var(--board-gap);
  border: 2px solid rgba(255, 45, 120, 0.3);
  box-shadow: 0 0 30px rgba(255, 45, 120, 0.15);
  position: relative;
}

.puzzle-tile {
  border-radius: 4px;
  cursor: pointer;
  transition: transform 0.15s ease-out;
  background-size: cover;
  position: relative;
  overflow: hidden;
}
.puzzle-tile:hover {
  filter: brightness(1.1);
}
.puzzle-tile:active {
  transform: scale(0.95);
}
.puzzle-tile.empty {
  background: transparent !important;
  cursor: default;
  border: 1px dashed rgba(255, 255, 255, 0.1);
}
.puzzle-tile.correct {
  box-shadow: inset 0 0 0 2px rgba(0, 229, 255, 0.4);
}
.puzzle-tile.sliding {
  transition: none;
  z-index: 10;
}
.puzzle-tile .tile-number {
  position: absolute;
  top: 2px;
  left: 2px;
  background: rgba(0, 0, 0, 0.6);
  color: var(--cyan);
  font-size: 0.6rem;
  font-family: 'Orbitron', sans-serif;
  padding: 1px 4px;
  border-radius: 3px;
  pointer-events: none;
}

/* ===== SIDE PANEL ===== */
.side-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 120px;
}
.reference-box {
  background: var(--bg-surface);
  border-radius: 12px;
  padding: 10px;
  border: 1px solid rgba(0, 229, 255, 0.2);
}
.reference-box h3 {
  font-size: 0.75rem;
  color: var(--cyan);
  margin-bottom: 8px;
}
.reference-image {
  width: 100px;
  height: 100px;
  border-radius: 8px;
  background-size: cover;
  background-position: center;
  margin: 0 auto;
  border: 1px solid rgba(255, 255, 255, 0.1);
}
.game-controls {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.game-controls .btn {
  font-size: 0.85rem;
  padding: 10px 16px;
}

/* ===== COMPLETE SCREEN ===== */
.completed-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  filter: blur(30px) brightness(0.3);
  z-index: 0;
}
.complete-overlay {
  position: relative;
  z-index: 1;
}
.complete-title {
  font-size: clamp(1.5rem, 5vw, 2.2rem);
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--gold), #ffaa00);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 10px rgba(255, 215, 0, 0.5));
  animation: completePulse 1s ease-in-out infinite alternate;
}
@keyframes completePulse {
  from { filter: drop-shadow(0 0 10px rgba(255, 215, 0, 0.3)); }
  to { filter: drop-shadow(0 0 25px rgba(255, 215, 0, 0.7)); }
}
.completed-image {
  width: min(80vw, 350px);
  height: min(80vw, 350px);
  margin: 0 auto 20px;
  border-radius: 16px;
  background-size: cover;
  background-position: center;
  border: 3px solid var(--gold);
  box-shadow: 0 0 40px rgba(255, 215, 0, 0.3);
  animation: imageReveal 0.8s ease-out;
}
@keyframes imageReveal {
  from { transform: scale(0.5); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.complete-stats {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 20px;
}
.result-stat {
  background: var(--bg-surface);
  border-radius: 12px;
  padding: 12px 24px;
  border: 1px solid rgba(255, 215, 0, 0.3);
}
.result-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  display: block;
}
.result-value {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gold);
}

.complete-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
  margin-bottom: 20px;
}
.complete-actions .btn {
  width: 100%;
  max-width: 300px;
}

/* ===== PATREON CTA ===== */
.patreon-cta {
  margin-top: 24px;
  padding: 14px 20px;
  background: linear-gradient(135deg, rgba(255, 45, 120, 0.15), rgba(0, 229, 255, 0.1));
  border-radius: 12px;
  border: 1px solid rgba(255, 45, 120, 0.3);
}
.patreon-cta a {
  color: var(--pink);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.95rem;
  transition: color 0.3s;
}
.patreon-cta a:hover {
  color: var(--cyan);
  text-shadow: 0 0 10px var(--cyan-glow);
}
.complete-cta {
  background: linear-gradient(135deg, rgba(255, 215, 0, 0.15), rgba(255, 45, 120, 0.15));
  border-color: rgba(255, 215, 0, 0.4);
  animation: ctaPulse 2s ease-in-out infinite;
}
@keyframes ctaPulse {
  0%, 100% { box-shadow: 0 0 10px rgba(255, 215, 0, 0.1); }
  50% { box-shadow: 0 0 25px rgba(255, 215, 0, 0.25); }
}
.complete-cta a {
  color: var(--gold);
  font-size: 1rem;
}

/* ===== CONFETTI CANVAS ===== */
#confetti-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 100;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 560px) {
  .game-area {
    flex-direction: column;
    align-items: center;
  }
  .side-panel {
    flex-direction: row;
    align-items: center;
    width: 100%;
    justify-content: center;
  }
  .reference-image {
    width: 70px;
    height: 70px;
  }
  .game-controls {
    flex-direction: row;
  }
  .puzzle-board {
    width: min(92vw, 400px);
    height: min(92vw, 400px);
  }
}

@media (max-width: 380px) {
  .difficulty-buttons {
    flex-direction: column;
    align-items: center;
  }
  .btn-difficulty {
    max-width: 200px;
    width: 100%;
    flex-direction: row;
    justify-content: center;
    gap: 12px;
    padding: 10px 16px;
  }
}