/* 전역 변수 및 기본 스타일 */
:root {
  --bg-app: #f0f7f4;          /* 파스텔 민트빛 연한 배경 */
  --bg-card: #ffffff;
  --text-main: #333d4b;
  --text-muted: #6b7684;
  
  /* 아기자기한 파스텔 컬러 */
  --color-pink: #ffb5c5;
  --color-pink-dark: #ff859f;
  --color-blue: #a0c4ff;
  --color-blue-dark: #7aa7ff;
  --color-mint: #bde0fe;
  --color-mint-dark: #8ecae6;
  --color-yellow: #ffdf00;
  --color-yellow-light: #fff2b2;
  --color-purple: #c8b6ff;
  --color-purple-dark: #b5e2fa;
  --color-gray: #e5e8eb;
  
  /* 카툰/드로잉 스타일을 위한 외곽선 및 그림자 */
  --border-width: 3px;
  --border-color: #2f3438;
  --shadow-dist: 5px;
  --shadow-color: #2f3438;
  --radius-lg: 20px;
  --radius-md: 12px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Gowun Dodum', sans-serif;
  background-color: var(--bg-app);
  color: var(--text-main);
  line-height: 1.6;
  padding: 20px;
  min-height: 100vh;
}

#app {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* 헤더 스타일 */
.app-header {
  padding: 20px;
  background-color: #ffffff;
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-dist) var(--shadow-dist) 0px var(--shadow-color);
  background-image: radial-gradient(var(--color-yellow-light) 20%, transparent 20%);
  background-size: 24px 24px;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.header-mascot {
  width: 90px;
  height: 90px;
  object-fit: contain;
  filter: drop-shadow(2px 2px 0px var(--border-color));
  animation: bounce 3s infinite ease-in-out;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0) rotate(0); }
  50% { transform: translateY(-8px) rotate(4deg); }
}

.header-text {
  text-align: left;
}

@media (max-width: 768px) {
  .header-text {
    text-align: center;
  }
}

.app-header h1 {
  font-size: 2.2rem;
  color: var(--text-main);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.icon-sparkle {
  color: var(--color-pink-dark);
  fill: var(--color-pink);
}

.app-header p {
  font-size: 1.1rem;
  color: var(--text-muted);
}

/* 메인 레이아웃 */
.app-main {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 24px;
}

@media (max-width: 992px) {
  .app-main {
    grid-template-columns: 1fr;
  }
}

/* 공통 패널 스타일 */
.panel {
  background-color: var(--bg-card);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-dist) var(--shadow-dist) 0px var(--shadow-color);
  padding: 24px;
}

.panel h2 {
  font-size: 1.4rem;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 3px dashed var(--color-blue);
  padding-bottom: 10px;
}

/* 설정 패널 스타일 */
.setup-panel {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.input-group label {
  font-weight: bold;
  font-size: 1.05rem;
}

.input-group .sub-label {
  font-weight: normal;
  font-size: 0.85rem;
  color: var(--text-muted);
}

textarea {
  font-family: inherit;
  font-size: 1rem;
  padding: 12px;
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-md);
  outline: none;
  resize: vertical;
  background-color: #fafbfb;
  transition: border-color 0.2s, background-color 0.2s;
}

textarea:focus {
  background-color: #ffffff;
  border-color: var(--color-blue-dark);
}

.grid-settings {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

input[type="number"] {
  font-family: inherit;
  font-size: 1.1rem;
  padding: 10px;
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-md);
  outline: none;
  text-align: center;
  background-color: #fafbfb;
}

input[type="number"]:focus {
  background-color: #ffffff;
  border-color: var(--color-blue-dark);
}

/* 현황 정보 카드 */
.info-card {
  background-color: #f8f9fa;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.info-card h3 {
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 6px;
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.stat-item {
  background-color: #ffffff;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  padding: 10px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.stat-value {
  font-size: 1.3rem;
  font-weight: bold;
  color: var(--text-main);
}

.guide-text {
  font-size: 0.85rem;
  color: var(--text-muted);
  background-color: var(--color-yellow-light);
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  display: flex;
  align-items: flex-start;
  gap: 6px;
}

.guide-text i {
  flex-shrink: 0;
  margin-top: 2px;
  width: 14px;
  height: 14px;
}

/* 자리 배치표 패널 스타일 */
.grid-panel {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.panel-header h2 {
  margin-bottom: 0;
  border-bottom: none;
  padding-bottom: 0;
}

/* 버튼 스타일 */
.button-group {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  font-family: inherit;
  font-size: 1.05rem;
  font-weight: bold;
  padding: 10px 20px;
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-lg);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: transform 0.1s, box-shadow 0.1s;
  box-shadow: 3px 3px 0px var(--shadow-color);
}

.btn:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0px var(--shadow-color);
}

.btn-primary {
  background-color: var(--color-pink);
}
.btn-primary:hover {
  background-color: var(--color-pink-dark);
}

.btn-secondary {
  background-color: var(--color-blue);
}
.btn-secondary:hover {
  background-color: var(--color-blue-dark);
}

.btn-danger {
  background-color: var(--color-purple);
}
.btn-danger:hover {
  background-color: var(--color-purple-dark);
}

/* 교탁 표시 영역 */
.classroom-front {
  display: flex;
  justify-content: center;
  margin-bottom: 10px;
}

.teacher-desk {
  background-color: #6c757d;
  color: #ffffff;
  padding: 12px 60px;
  border: var(--border-width) solid var(--border-color);
  border-radius: 30px;
  font-weight: bold;
  font-size: 1.1rem;
  box-shadow: 3px 3px 0px var(--shadow-color);
  background-image: linear-gradient(45deg, #5a6268 25%, transparent 25%, transparent 50%, #5a6268 50%, #5a6268 75%, transparent 75%, transparent);
  background-size: 40px 40px;
}

/* 자리 배치표 그리드 */
.grid-container {
  display: grid;
  gap: 16px;
  justify-content: center;
  align-content: start;
  margin: 10px 0;
  width: 100%;
}

/* 자리 카드 디자인 */
.seat-card {
  aspect-ratio: 4 / 3;
  background-color: #ffffff;
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: 4px 4px 0px var(--shadow-color);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
  cursor: pointer;
  user-select: none;
  transition: transform 0.2s, background-color 0.2s, box-shadow 0.2s;
  padding: 10px;
}

.seat-card:hover {
  transform: translateY(-4px);
  box-shadow: 4px 8px 0px var(--shadow-color);
}

.seat-card:active {
  transform: translateY(0);
  box-shadow: 2px 2px 0px var(--shadow-color);
}

/* 번호 배지 */
.seat-number {
  position: absolute;
  top: 6px;
  left: 8px;
  font-size: 0.75rem;
  font-weight: bold;
  background-color: var(--color-gray);
  padding: 2px 6px;
  border-radius: 10px;
  border: 1.5px solid var(--border-color);
}

/* 학생 이름 */
.student-name {
  font-size: 1.35rem;
  font-weight: bold;
  text-align: center;
  word-break: break-all;
  white-space: normal;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

/* 제외된 자리 상태 */
.seat-card.disabled {
  background-color: #e5e8eb;
  background-image: repeating-linear-gradient(45deg, transparent, transparent 10px, rgba(0,0,0,0.03) 10px, rgba(0,0,0,0.03) 20px);
  border-style: dashed;
}

.seat-card.disabled .student-name {
  color: var(--text-muted);
  font-size: 0.95rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

/* 카드 내 마스코트 이미지 스타일 */
.seat-card-img {
  width: 48px;
  height: 48px;
  object-fit: contain;
  filter: drop-shadow(1px 1.5px 0px var(--border-color));
  margin-bottom: 4px;
}

/* 빈자리 상태 */
.seat-card.empty {
  background-color: var(--color-yellow-light);
  border-color: var(--border-color);
}

.seat-card.empty .student-name {
  color: #a06a00;
  font-size: 1.05rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

/* 애니메이션 효과 */
@keyframes shake {
  0% { transform: translate(1px, 1px) rotate(0deg); }
  10% { transform: translate(-1px, -2px) rotate(-1deg); }
  20% { transform: translate(-3px, 0px) rotate(1deg); }
  30% { transform: translate(0px, 2px) rotate(0deg); }
  40% { transform: translate(1px, -1px) rotate(1deg); }
  50% { transform: translate(-1px, 2px) rotate(-1deg); }
  60% { transform: translate(-3px, 1px) rotate(0deg); }
  70% { transform: translate(2px, 1px) rotate(-1deg); }
  80% { transform: translate(-1px, -1px) rotate(1deg); }
  90% { transform: translate(2px, 2px) rotate(0deg); }
  100% { transform: translate(1px, -2px) rotate(-1deg); }
}

.shaking {
  animation: shake 0.5s;
  animation-iteration-count: infinite;
}

/* 푸터 */
.app-footer {
  text-align: center;
  padding: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
}