/* ─── 기본 리셋 ─────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #1b5e20;
  font-family: 'Segoe UI', system-ui, sans-serif;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

/* ─── 앱 래퍼 ────────────────────────────────────────────── */
#app {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
}

/* ─── 헤더 ───────────────────────────────────────────────── */
#header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 10px;
  background: rgba(0, 0, 0, 0.4);
  color: #fff;
  flex-shrink: 0;
  gap: 6px;
  min-height: 42px;
  flex-wrap: wrap;
}

#header h1 {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: #ffd54f;
  text-shadow: 0 1px 3px rgba(0,0,0,0.5);
  white-space: nowrap;
}

.header-info {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.78rem;
  color: #c8e6c9;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.62rem;
  color: #81c784;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.stat-value {
  font-size: 0.9rem;
  font-weight: 700;
  color: #fff;
}

/* ─── 헤더 버튼 ─────────────────────────────────────────── */
.btn-group {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.btn {
  display: flex;
  align-items: center;
  gap: 3px;
  padding: 4px 8px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.72rem;
  font-weight: 600;
  transition: background 0.15s, transform 0.1s;
  white-space: nowrap;
}

.btn:active { transform: scale(0.95); }

.btn-new {
  background: #43a047;
  color: #fff;
}
.btn-new:hover { background: #388e3c; }

.btn-undo {
  background: #1565c0;
  color: #fff;
}
.btn-undo:hover { background: #0d47a1; }
.btn-undo:disabled {
  background: #455a64;
  cursor: not-allowed;
  opacity: 0.6;
}

.btn-pause {
  background: #f57c00;
  color: #fff;
}
.btn-pause:hover { background: #e65100; }

.btn-mute {
  background: #546e7a;
  color: #fff;
}
.btn-mute:hover { background: #37474f; }

.btn-restart {
  background: #e65100;
  color: #fff;
}
.btn-restart:hover { background: #bf360c; }

.btn-giveup {
  background: #b71c1c;
  color: #fff;
}
.btn-giveup:hover { background: #7f0000; }

.btn-autocomplete {
  background: #6a1b9a;
  color: #fff;
}
.btn-autocomplete:hover { background: #4a148c; }

.btn-continue {
  background: #1565c0;
  color: #fff;
  border: 2px solid #90caf9;
  padding: 10px 28px;
  font-size: 1rem;
}
.btn-continue:hover { background: #0d47a1; }

/* ─── 캔버스 영역 ────────────────────────────────────────── */
#canvas-wrapper {
  flex: 1;
  position: relative;
  overflow: hidden;
}

#game-canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: default;
}

#game-canvas.dragging {
  cursor: grabbing;
}

/* ─── 자동저장 토스트 알림 ───────────────────────────────── */
#save-toast {
  position: absolute;
  bottom: 16px;
  right: 16px;
  background: rgba(0, 0, 0, 0.65);
  color: #a5d6a7;
  font-size: 0.75rem;
  padding: 6px 12px;
  border-radius: 20px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s;
  z-index: 20;
}
#save-toast.show { opacity: 1; }

/* ─── 오버레이 ────────────────────────────────────────────── */
.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  color: #fff;
  z-index: 10;
}

.overlay.hidden { display: none; }

.overlay h2 {
  font-size: 1.8rem;
  font-weight: 800;
  text-shadow: 0 2px 8px rgba(0,0,0,0.7);
  color: #ffd54f;
}

.overlay p {
  font-size: 1rem;
  color: #c8e6c9;
}

.overlay .btn {
  padding: 10px 24px;
  font-size: 0.95rem;
}

/* ─── 시작 화면 ─────────────────────────────────────────── */
#start-overlay {
  background: linear-gradient(160deg, #1a3a1a 0%, #0d2b0d 100%);
}

#start-overlay .logo {
  font-size: 2.5rem;
  font-weight: 900;
  color: #ffd54f;
  text-shadow: 0 3px 12px rgba(0,0,0,0.6);
  letter-spacing: 0.04em;
}

#start-overlay .subtitle {
  font-size: 0.9rem;
  color: #81c784;
}

.start-hints {
  font-size: 0.78rem;
  color: #aed581;
  text-align: center;
  line-height: 1.8;
}

.saved-info {
  font-size: 0.78rem;
  color: #90caf9;
  margin-top: -4px;
  letter-spacing: 0.02em;
}

.hidden { display: none !important; }

/* ─── 승리 화면 ─────────────────────────────────────────── */
#win-overlay {
  background: radial-gradient(circle at center, rgba(255,193,7,0.15) 0%, rgba(0,0,0,0.75) 100%);
}

#win-overlay h2 {
  font-size: 2.2rem;
  animation: pulse 1s ease-in-out infinite alternate;
}

/* ─── 패배 화면 ─────────────────────────────────────────── */
#fail-overlay h2 {
  color: #ef9a9a;
}

@keyframes pulse {
  from { text-shadow: 0 0 10px #ffd54f; }
  to   { text-shadow: 0 0 30px #ffd54f, 0 0 60px #ff8f00; }
}

/* ─── 도움말 패널 ────────────────────────────────────────── */
.help-panel {
  background: #1b3a1b;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 12px;
  padding: 18px 22px;
  max-width: 440px;
  width: 92%;
  max-height: 86vh;
  overflow-y: auto;
}

.help-panel h2 {
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffd54f;
  margin-bottom: 12px;
  text-align: center;
}

.help-panel h3 {
  font-size: 0.82rem;
  font-weight: 600;
  color: #a5d6a7;
  margin: 12px 0 5px;
  padding-bottom: 3px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.help-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.83rem;
}

.help-table th {
  text-align: left;
  color: #81c784;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 4px 8px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.help-table td {
  padding: 5px 8px;
  color: #e8f5e9;
  vertical-align: middle;
}

.help-table tr:hover td {
  background: rgba(255,255,255,0.04);
}

kbd {
  display: inline-block;
  padding: 1px 6px;
  font-family: monospace;
  font-size: 0.82rem;
  background: #2e4d2e;
  border: 1px solid rgba(255,255,255,0.25);
  border-bottom-width: 2px;
  border-radius: 4px;
  color: #c8e6c9;
  white-space: nowrap;
}

.help-note {
  font-size: 0.74rem;
  color: #81c784;
  margin-top: 3px;
}

.help-rules {
  list-style: none;
  padding: 0;
  font-size: 0.82rem;
  color: #c8e6c9;
  line-height: 1.9;
}

.help-rules li::before {
  content: '→ ';
  color: #66bb6a;
}

/* ─── 확인 팝업 ──────────────────────────────────────────── */
.confirm-panel {
  background: #1b3a1b;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 14px;
  padding: 28px 32px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-width: 240px;
}

.confirm-msg {
  font-size: 1rem;
  color: #e8f5e9;
  line-height: 1.7;
}

.confirm-btns {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.btn-cancel {
  background: #546e7a;
  color: #fff;
  padding: 8px 20px;
  font-size: 0.9rem;
}
.btn-cancel:hover { background: #37474f; }

/* ─── 반응형 ─────────────────────────────────────────────── */
@media (max-width: 600px) {
  #header { padding: 3px 6px; }
  #header h1 { font-size: 0.85rem; }
  .btn { padding: 3px 6px; font-size: 0.66rem; }
  .stat-value { font-size: 0.82rem; }
  .btn-autocomplete { display: none; }
  .btn-restart { font-size: 0.66rem; }
}

@media (max-width: 400px) {
  .stat-item:last-child { display: none; }
  .btn-mute { display: none; }
}