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

:root {
  --bg: #0a0a0f;
  --bg2: #12121a;
  --bg3: #1a1a2e;
  --pink: #ff2d78;
  --pink-glow: rgba(255, 45, 120, 0.4);
  --cyan: #00f5ff;
  --cyan-glow: rgba(0, 245, 255, 0.4);
  --gold: #ffd700;
  --white: #f0f0f0;
  --gray: #888;
  --font-en: 'Orbitron', sans-serif;
  --font-ja: 'Noto Sans JP', sans-serif;
  --board-size: min(90vw, 500px);
}

html { font-size: 16px; }

body {
  font-family: var(--font-ja);
  background: var(--bg);
  color: var(--white);
  min-height: 100dvh;
  overflow-x: hidden;
  -webkit-user-select: none;
  user-select: none;
  touch-action: manipulation;
}

/* === SCREENS === */
.screen {
  display: none;
  flex-direction: column;
  align-items: center;
  min-height: 100dvh;
  padding: 1rem;
}
.screen.active { display: flex; }

/* === COMMON === */
.en-small {
  font-size: 0.7em;
  color: var(--gray);
  font-family: var(--font-en);
}

/* === START SCREEN === */
#start-screen {
  justify-content: center;
  gap: 1.5rem;
  text-align: center;
  background: radial-gradient(ellipse at 50% 30%, rgba(255,45,120,0.08) 0%, transparent 70%),
              radial-gradient(ellipse at 50% 80%, rgba(0,245,255,0.05) 0%, transparent 70%),
              var(--bg);
}

.logo-container { margin-bottom: 0.5rem; }

.logo {
  font-family: var(--font-en);
  font-size: clamp(2rem, 8vw, 3.5rem);
  font-weight: 900;
  letter-spacing: 2px;
}
.logo-muscle { color: var(--cyan); text-shadow: 0 0 20px var(--cyan-glow); }
.logo-love { color: var(--pink); text-shadow: 0 0 20px var(--pink-glow); }

.game-title { margin-top: 0.5rem; }
.title-ja {
  display: block;
  font-size: clamp(1.2rem, 5vw, 2rem);
  font-weight: 900;
  background: linear-gradient(135deg, var(--pink), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.title-en {
  display: block;
  font-family: var(--font-en);
  font-size: clamp(0.6rem, 2.5vw, 0.9rem);
  color: var(--gray);
  letter-spacing: 3px;
  margin-top: 0.2rem;
}

.puzzle-icon {
  font-size: 4rem;
  animation: float 3s ease-in-out infinite;
}
@keyframes float {
  0%,100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-10px) rotate(5deg); }
}

/* Difficulty Select */
.select-label {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
}

.difficulty-buttons {
  display: flex;
  gap: 0.6rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-difficulty {
  background: var(--bg3);
  border: 2px solid #333;
  color: var(--white);
  padding: 0.8rem 1.2rem;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.3s;
  min-width: 100px;
}
.btn-difficulty .diff-name {
  display: block;
  font-family: var(--font-en);
  font-size: 0.9rem;
  font-weight: 700;
}
.btn-difficulty .diff-detail {
  display: block;
  font-size: 0.7rem;
  color: var(--gray);
  margin-top: 0.2rem;
}
.btn-difficulty:hover { border-color: var(--cyan); }
.btn-difficulty.selected {
  border-color: var(--pink);
  background: rgba(255,45,120,0.15);
  box-shadow: 0 0 15px var(--pink-glow);
}

/* Buttons */
.btn-primary {
  font-family: var(--font-ja);
  font-size: 1.1rem;
  font-weight: 700;
  padding: 0.9rem 2.5rem;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.3s;
  background: linear-gradient(135deg, var(--pink), #ff6b9d);
  color: #fff;
  box-shadow: 0 4px 20px var(--pink-glow);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px var(--pink-glow);
}
.btn-primary:active { transform: translateY(0); }

.btn-icon {
  background: var(--bg3);
  border: 1px solid #333;
  color: var(--white);
  font-size: 1.2rem;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s;
}
.btn-icon:hover { border-color: var(--cyan); }

/* Patreon */
.patreon-link, .patreon-cta {
  display: inline-block;
  color: var(--pink);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.6rem 1.5rem;
  border: 1px solid var(--pink);
  border-radius: 30px;
  transition: all 0.3s;
  margin-top: 0.5rem;
}
.patreon-link:hover, .patreon-cta:hover {
  background: rgba(255,45,120,0.15);
  box-shadow: 0 0 20px var(--pink-glow);
}
.patreon-cta {
  font-size: 1rem;
  padding: 1rem 2rem;
  line-height: 1.6;
  animation: pulse-border 2s ease-in-out infinite;
}
@keyframes pulse-border {
  0%,100% { box-shadow: 0 0 5px var(--pink-glow); }
  50% { box-shadow: 0 0 25px var(--pink-glow); }
}

/* === GAME SCREEN === */
#game-screen {
  gap: 0.5rem;
  padding: 0.5rem;
}

.game-header {
  width: 100%;
  max-width: 600px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.4rem 0;
}
.header-left, .header-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.game-info {
  display: flex;
  gap: 0.8rem;
}
.info-item {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

/* Game Area */
.game-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.8rem;
  width: 100%;
  max-width: 600px;
  flex: 1;
}

.board-section {
  position: relative;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* Reference thumbnail */
.reference-thumb {
  position: absolute;
  top: 0;
  right: -5px;
  z-index: 10;
  width: 70px;
  height: 70px;
  border: 2px solid var(--cyan);
  border-radius: 8px;
  overflow: hidden;
  opacity: 0.8;
  transition: all 0.3s;
  cursor: pointer;
}
.reference-thumb:hover {
  width: 150px;
  height: 150px;
  opacity: 1;
  z-index: 100;
}
.reference-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.ref-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0,0,0,0.7);
  font-size: 0.5rem;
  text-align: center;
  padding: 1px;
}

/* Puzzle Board */
.puzzle-board {
  width: var(--board-size);
  height: var(--board-size);
  display: grid;
  background: var(--bg2);
  border: 2px solid #333;
  border-radius: 8px;
  position: relative;
  overflow: hidden;
}

.board-cell {
  border: 1px dashed rgba(255,255,255,0.1);
  position: relative;
  transition: background 0.2s;
}
.board-cell.highlight {
  background: rgba(0,245,255,0.15);
  border-color: var(--cyan);
}
.board-cell.ghost {
  background-size: cover;
  opacity: 0.08;
}
.board-cell.filled {
  border-color: transparent;
}

/* Placed piece on board */
.board-cell .placed-piece {
  width: 100%;
  height: 100%;
  background-size: cover;
  position: absolute;
  top: 0; left: 0;
  pointer-events: none;
}

/* Piece Tray */
.tray-section {
  width: 100%;
}
.tray-label {
  text-align: center;
  font-size: 0.75rem;
  color: var(--gray);
  margin-bottom: 0.4rem;
}

.piece-tray {
  width: 100%;
  min-height: 80px;
  max-height: 200px;
  overflow-y: auto;
  background: var(--bg2);
  border: 2px solid #333;
  border-radius: 8px;
  padding: 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
  align-content: flex-start;
}

/* Puzzle Piece in tray */
.puzzle-piece {
  border: 2px solid var(--pink);
  border-radius: 4px;
  cursor: grab;
  transition: transform 0.15s, box-shadow 0.15s;
  background-size: cover;
  position: relative;
  flex-shrink: 0;
}
.puzzle-piece:hover {
  transform: scale(1.05);
  box-shadow: 0 0 15px var(--pink-glow);
  z-index: 10;
}
.puzzle-piece.dragging {
  opacity: 0.7;
  cursor: grabbing;
  transform: scale(1.1);
  box-shadow: 0 0 25px var(--cyan-glow);
  border-color: var(--cyan);
  z-index: 1000;
  position: fixed;
  pointer-events: none;
}
.puzzle-piece.wrong {
  animation: shake 0.4s ease-out;
}
@keyframes shake {
  0%,100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-5px); }
  80% { transform: translateX(5px); }
}
.puzzle-piece.correct {
  animation: pop 0.3s ease-out;
}
@keyframes pop {
  0% { transform: scale(1); }
  50% { transform: scale(1.15); }
  100% { transform: scale(1); }
}

/* === RESULT SCREEN === */
#result-screen {
  justify-content: center;
  gap: 1rem;
  text-align: center;
  position: relative;
  overflow: hidden;
  background: radial-gradient(ellipse at 50% 50%, rgba(255,45,120,0.1) 0%, transparent 70%),
              var(--bg);
}

.result-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  z-index: 2;
}

.result-title .title-ja {
  font-size: clamp(1.5rem, 6vw, 2.5rem);
  display: block;
}
.result-title .title-en {
  font-size: clamp(0.7rem, 3vw, 1rem);
  display: block;
}

.result-image {
  width: min(80vw, 350px);
  height: min(80vw, 350px);
  border: 3px solid var(--gold);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 0 40px rgba(255,215,0,0.3);
}
.result-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.result-stats {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  justify-content: center;
}
.stat-item {
  text-align: center;
}
.stat-label {
  display: block;
  font-size: 0.75rem;
  color: var(--gray);
}
.stat-value {
  display: block;
  font-family: var(--font-en);
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--cyan);
  text-shadow: 0 0 10px var(--cyan-glow);
}

.result-buttons {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  justify-content: center;
}
.btn-share { background: linear-gradient(135deg, #1DA1F2, #0d8bd9); box-shadow: 0 4px 15px rgba(29,161,242,0.3); }
.btn-retry { background: linear-gradient(135deg, var(--cyan), #00c4cc); box-shadow: 0 4px 15px var(--cyan-glow); color: #000; }
.btn-new { background: linear-gradient(135deg, var(--pink), #ff6b9d); }
.result-buttons .btn-primary { padding: 0.7rem 1.5rem; font-size: 0.9rem; }

/* === CONFETTI === */
.confetti-container {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 1;
  overflow: hidden;
}
.confetti {
  position: absolute;
  top: -10px;
  width: 10px;
  height: 10px;
  opacity: 0;
  animation: confetti-fall linear forwards;
}
@keyframes confetti-fall {
  0% { opacity: 1; transform: translateY(0) rotate(0deg); }
  100% { opacity: 0; transform: translateY(100vh) rotate(720deg); }
}

/* === SCROLLBAR === */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb { background: #444; border-radius: 3px; }

/* === RESPONSIVE === */
@media (max-width: 480px) {
  :root { --board-size: min(92vw, 400px); }
  .reference-thumb { width: 55px; height: 55px; right: -2px; }
  .reference-thumb:hover { width: 120px; height: 120px; }
  .game-info { gap: 0.4rem; }
  .info-item { font-size: 0.75rem; }
  .piece-tray { max-height: 150px; }
}

@media (min-width: 768px) {
  :root { --board-size: min(60vw, 500px); }
}