/* 영어 학습 앱 공통 스타일 */

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

body {
  font-family: 'Noto Sans KR', sans-serif;
  background-color: #f5f5f5;
  color: #333;
  line-height: 1.6;
}

/* 컨테이너 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
}

/* 헤더 스타일 */
.main-header {
  background-color: #4a6da7;
  color: white;
  padding: 15px 0;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.logo {
  font-size: 1.8rem;
  margin: 0;
}

.main-nav ul {
  display: flex;
  list-style: none;
  padding-top: 10px;
}

.main-nav li {
  margin-right: 20px;
}

.main-nav a {
  color: white;
  text-decoration: none;
  font-weight: 500;
  padding: 5px 0;
  transition: all 0.3s ease;
}

.main-nav a.active, .main-nav a:hover {
  color: #ffeb3b;
  border-bottom: 2px solid #ffeb3b;
}

/* 메인 콘텐츠 스타일 */
main {
  padding: 30px 0;
  min-height: calc(100vh - 200px);
}

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.page-title {
  font-size: 1.8rem;
  color: #4a6da7;
}

.back-btn {
  display: inline-block;
  color: #4a6da7;
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s ease;
}

.back-btn:hover {
  color: #345286;
}

/* 푸터 스타일 */
.main-footer {
  background-color: #2c3e50;
  color: white;
  padding: 20px 0;
  margin-top: 40px;
  text-align: center;
}

.main-footer p {
  margin: 0;
  font-size: 0.9rem;
}

/* 링크 스타일 */
a {
  color: #4a6da7;
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: #345286;
}

/* 버튼 스타일 */
.btn {
  display: inline-block;
  padding: 8px 16px;
  background-color: #4a6da7;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 500;
  transition: all 0.3s ease;
}

.btn:hover {
  background-color: #345286;
}

/* 모바일 대응 */
@media (max-width: 768px) {
  .container {
    padding: 0 10px;
  }
  
  .main-nav ul {
    flex-wrap: wrap;
  }
  
  .main-nav li {
    margin-right: 15px;
    margin-bottom: 5px;
  }
  
  .page-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .page-title {
    margin-bottom: 10px;
  }
}

/* 푸터 내비게이션 컨테이너 - 하단 고정 */
#footer-container {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
}

/* 카테고리 선택 */
.category-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin: 1rem 0;
}

.category-card {
  background-color: white;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  padding: 1rem;
  text-align: center;
  cursor: pointer;
  transition: transform 0.3s, box-shadow 0.3s;
}

.category-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.category-card.selected {
  border: 2px solid #3f51b5;
  background-color: #e8eaf6;
}

.category-image {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: #3f51b5;
}

.category-name {
  font-weight: 500;
}

/* 난이도 선택 */
.difficulty-selector {
  margin: 1rem 0;
}

.difficulty-buttons {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.difficulty-button {
  flex: 1;
  padding: 0.5rem;
  border: 1px solid #dee2e6;
  background-color: white;
  color: #495057;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.3s;
  font-size: 0.9rem;
}

.difficulty-button.active {
  background-color: #3f51b5;
  color: white;
  border-color: #3f51b5;
}

/* 시작 버튼 */
.start-button {
  display: block;
  width: 100%;
  padding: 1rem;
  margin-top: 1.5rem;
  font-size: 1.1rem;
}

/* 결과 모달 */
.result-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s;
}

.result-modal.show {
  opacity: 1;
  visibility: visible;
}

.result-content {
  background-color: white;
  border-radius: 8px;
  padding: 2rem;
  width: 90%;
  max-width: 500px;
  text-align: center;
}

.result-title {
  color: #3f51b5;
  margin-bottom: 1rem;
}

.result-list {
  margin-bottom: 1.5rem;
}

.result-item {
  margin: 0.5rem 0;
  font-size: 1.1rem;
}

.result-button {
  margin: 0.5rem;
  padding: 0.75rem 1.5rem;
}

/* 반응형 스타일 */
@media (min-width: 768px) {
  .container {
    width: 100%;
    margin: 0 auto;
  }
  
  .category-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .container {
    max-width: 960px;
  }
  
  .category-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}