/* 글로벌 디자인 시스템 및 챕터 대시보드 스타일 */

:root {
  --lego-red: #ef4444;
  --lego-red-dark: #dc2626;
  --lego-blue: #3b82f6;
  --lego-blue-dark: #1d4ed8;
  --lego-yellow: #facc15;
  --lego-yellow-dark: #eab308;
  --lego-green: #22c55e;
  --lego-green-dark: #16a34a;
  
  --bg-pastel-red: #ffe4e6;
  --bg-pastel-blue: #dbeafe;
  --bg-pastel-yellow: #fef9c3;
  --bg-pastel-green: #dcfce7;
  --bg-pastel-purple: #f3e8ff;

  --text-dark: #1e293b;
  --text-light: #64748b;
  --board-grid: #e2e8f0;

  --font-kids: 'Jua', 'Gaegu', sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent; /* 터치 시 파란 박스 제거 */
}

body {
  font-family: var(--font-kids);
  background: radial-gradient(circle, #f8fafc 0%, #e2e8f0 100%);
  color: var(--text-dark);
  min-height: 100vh;
  overflow-x: hidden;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}

button,
[role="button"] {
  font-family: var(--font-kids);
}

button:focus-visible,
[role="button"]:focus-visible {
  outline: 4px solid #38bdf8;
  outline-offset: 4px;
}

/* 네이티브 앱 느낌의 SPA 화면 배치 */
.screen {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  min-height: 100%;
  display: none;
  flex-direction: column;
  padding: 20px;
  overflow-y: auto;
  opacity: 0;
  transition: opacity 0.35s ease-in-out;
}

.screen.active {
  display: flex;
  opacity: 1;
}

/* 탄력 있는 바운스 애니메이션 */
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

/* 헤더 및 내비게이션 바 */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
  width: 100%;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
  z-index: 10;
}

.btn-back {
  background: var(--lego-red);
  color: white;
  border: none;
  padding: 10px 18px;
  font-family: var(--font-kids);
  font-size: 18px;
  border-radius: 12px;
  cursor: pointer;
  box-shadow: 0 4px 0 var(--lego-red-dark);
  transition: transform 0.1s;
}

.btn-back:active {
  transform: translateY(4px);
  box-shadow: none;
}

.header-title {
  font-size: 26px;
  color: var(--text-dark);
  text-shadow: 2px 2px 0px #ffffff;
}

.header-status {
  display: flex;
  gap: 10px;
  align-items: center;
}

.trophy-badge {
  background: gold;
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 18px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  display: flex;
  align-items: center;
  gap: 5px;
}

.btn-mute {
  background: white;
  border: 3px solid var(--text-dark);
  font-size: 20px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

/* 1. 스플래시 화면 */
#splash-screen {
  background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  color: white;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.logo-container {
  margin-bottom: 30px;
  animation: bounce 2s infinite ease-in-out;
}

.logo-text {
  font-size: 55px;
  text-shadow: 4px 4px 0 var(--lego-yellow-dark), -2px -2px 0 var(--lego-red);
  color: var(--lego-yellow);
  margin-top: 15px;
  letter-spacing: 0;
}

.logo-sub {
  font-size: 22px;
  margin-top: 5px;
  color: #bfdbfe;
  font-weight: 700;
}

.logo-car-illustration {
  width: 180px;
  height: auto;
  filter: drop-shadow(0px 8px 12px rgba(0, 0, 0, 0.3));
}

.btn-start {
  background: var(--lego-yellow);
  color: var(--text-dark);
  font-family: var(--font-kids);
  font-size: 32px;
  padding: 15px 45px;
  border: none;
  border-radius: 25px;
  cursor: pointer;
  box-shadow: 0 8px 0 var(--lego-yellow-dark);
  transition: transform 0.1s, box-shadow 0.1s;
  animation: pulse 1.5s infinite ease-in-out;
}

.btn-start:active {
  transform: translateY(8px);
  box-shadow: none;
}

/* 2. 챕터 선택 화면 (대시보드) */
.chapter-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  max-width: 900px;
  width: 100%;
  margin: auto;
  padding: 10px 0;
}

.chapter-card {
  border-radius: 24px;
  padding: 24px;
  text-align: center;
  cursor: pointer;
  box-shadow: 0 8px 16px rgba(0,0,0,0.08);
  transition: transform 0.2s, box-shadow 0.2s;
  border: 4px solid white;
}

.chapter-card:hover {
  transform: scale(1.04) translateY(-5px);
  box-shadow: 0 12px 24px rgba(0,0,0,0.12);
}

.chapter-card:active {
  transform: scale(0.98);
}

.chapter-card.ch1 { background-color: var(--bg-pastel-red); border-color: var(--lego-red); }
.chapter-card.ch2 { background-color: var(--bg-pastel-blue); border-color: var(--lego-blue); }
.chapter-card.ch3 { background-color: var(--bg-pastel-yellow); border-color: var(--lego-yellow); }
.chapter-card.ch4 { background-color: var(--bg-pastel-green); border-color: var(--lego-green); }
.chapter-card.ch5 { 
  background-color: var(--bg-pastel-purple); 
  border-color: #a855f7;
  animation: pulse 3s infinite ease-in-out;
}

.chapter-icon {
  font-size: 50px;
  margin-bottom: 12px;
}

.chapter-title {
  font-size: 24px;
  margin-bottom: 8px;
  color: var(--text-dark);
}

.chapter-desc {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.4;
  margin-bottom: 15px;
}

.chapter-progress {
  font-size: 16px;
  color: var(--text-dark);
  font-weight: bold;
  background: white;
  padding: 4px 12px;
  border-radius: 12px;
  display: inline-block;
}

/* 3. 글자/카드 선택 화면 */
.letter-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(85px, 1fr));
  gap: 15px;
  max-width: 900px;
  width: 100%;
  margin: auto;
  padding: 10px 0;
}

.letter-card {
  aspect-ratio: 1;
  background: white;
  border-radius: 18px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
  cursor: pointer;
  box-shadow: 0 6px 10px rgba(0,0,0,0.06);
  border: 3px solid #e2e8f0;
  transition: transform 0.15s, border-color 0.15s;
  min-width: 0;
}

.letter-card:hover {
  transform: translateY(-4px) scale(1.05);
  border-color: var(--lego-blue);
}

.letter-card.completed {
  background: var(--bg-pastel-green);
  border-color: var(--lego-green);
}

.card-char {
  font-size: 32px;
  font-weight: bold;
  max-width: 100%;
  overflow-wrap: anywhere;
  text-align: center;
}

.card-stars {
  font-size: 14px;
  margin-top: 4px;
  color: gold;
}

/* 낱말 카드 전용 넒은 그리드 */
.word-list {
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
}

.word-card .card-char {
  font-size: 22px;
}

.word-card-illustration {
  width: 50px;
  height: 50px;
  margin-bottom: 4px;
}

/* 젤리 바운스 호버 효과 */
.bounce-hover {
  transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.bounce-hover:hover {
  transform: scale(1.07);
}

.bounce-hover:active {
  transform: scale(0.95);
}

@media (max-width: 640px) {
  .screen {
    padding: 12px;
  }

  header {
    gap: 8px;
    margin-bottom: 10px;
  }

  .btn-back {
    padding: 8px 12px;
    font-size: 15px;
    border-radius: 10px;
  }

  .header-title {
    font-size: 20px;
    text-align: center;
    flex: 1;
  }

  .trophy-badge {
    padding: 5px 9px;
    font-size: 15px;
  }

  .btn-mute {
    width: 38px;
    height: 38px;
    font-size: 18px;
  }

  .logo-car-illustration {
    width: 140px;
  }

  .logo-text {
    font-size: 38px;
    line-height: 1.05;
    text-shadow: 3px 3px 0 var(--lego-yellow-dark), -1px -1px 0 var(--lego-red);
  }

  .logo-sub {
    font-size: 18px;
  }

  .btn-start {
    width: min(100%, 310px);
    padding: 14px 22px;
    font-size: 26px;
  }

  .chapter-container {
    grid-template-columns: 1fr;
    gap: 12px;
    margin: 0 auto;
  }

  .chapter-card {
    padding: 18px;
    border-radius: 18px;
  }

  .chapter-icon {
    font-size: 38px;
    margin-bottom: 6px;
  }

  .chapter-title {
    font-size: 21px;
  }

  .letter-list {
    grid-template-columns: repeat(auto-fill, minmax(72px, 1fr));
    gap: 10px;
    margin: 0 auto;
  }

  .word-list {
    grid-template-columns: repeat(auto-fill, minmax(118px, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}