/* Sections & Cards */
.content-section, .app-section, .guide-overview {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2rem;
  margin-bottom: 2rem;
  transition: background-color 0.3s, border-color 0.3s;
}

.app-section {
  text-align: center;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
}

.article-header {
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.5rem;
}

.article-title {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.75rem;
  line-height: 1.35;
}

.article-meta {
  font-size: 0.875rem;
  color: var(--text-sub);
}

.section-title {
  font-size: 1.1rem;
  color: var(--text-sub);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.content-section h2, .guide-overview h2 {
  font-size: 1.35rem;
  color: var(--accent-color);
  margin-bottom: 1rem;
}

.content-section p, .guide-overview p {
  color: var(--text-sub);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

/* Articles & Projects Grid */
.articles-section, .other-projects {
  margin-bottom: 3rem;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.25rem;
}

.article-card, .project-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.2s, border-color 0.2s, background-color 0.3s;
}

.article-card:hover, .project-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-color);
  text-decoration: none;
}

/* Callouts & Episode Cards */
.episode-card {
  background-color: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  margin: 1.25rem 0;
  transition: background-color 0.3s, border-color 0.3s;
}

.episode-card h3 {
  font-size: 1.1rem;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.episode-card p {
  font-size: 0.9rem;
  color: var(--text-sub);
  margin-bottom: 0;
}

.callout {
  background-color: rgba(56, 189, 248, 0.1);
  border: 1px solid var(--accent-color);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  color: var(--text-main);
  font-size: 0.9rem;
}

/* 치트시트 테이블 기본 스타일 및 테두리 적용 */
.cheat-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
  border: 1px solid var(--border-color);
}

.cheat-table th,
.cheat-table td {
  border: 1px solid var(--border-color);
  padding: 0.75rem 1rem;
  text-align: left;
  vertical-align: middle;
}

.cheat-table thead th {
  background-color: var(--code-bg);
  color: var(--text-main);
  font-weight: 600;
}

/* 치트시트 테이블 컬럼 최소 너비 규격 */
.cheat-table .col-pattern {
  min-width: 130px;
}

.cheat-table .col-hand {
  min-width: 210px;
}

/* 치트시트 표 내부 손패 정렬 및 크기 지정 */
.cheat-table .mahjong-hand {
  justify-content: flex-start;
  gap: 2px;
  padding: 0;
  margin-top: 0;
}

.cheat-table .mahjong-hand .tile {
  height: 48px;
  width: auto;
}

/* 치트시트 목록 카드 형태 */
.cheat-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 1rem;
}

.cheat-item {
  background-color: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.25rem;
}

.cheat-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.cheat-item-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
}

.cheat-item-waits {
  font-size: 0.95rem;
  color: var(--accent-color);
  font-weight: 600;
}

.cheat-item-hand {
  margin: 0.8rem 0;
  overflow-x: auto; /* 화면이 작아져도 패가 다음 줄로 깨지지 않고 스크롤 대응 */
}

.cheat-item-hand .mahjong-hand {
  justify-content: flex-start;
  gap: 2px;
  padding: 0;
  margin: 0;
}

.cheat-item-hand .tile {
  height: 48px;
  width: auto;
}

.cheat-item-desc {
  font-size: 0.9rem;
  color: var(--text-sub);
  margin-top: 0.5rem;
  line-height: 1.5;
}


/* 보조 설명용 소형 텍스트 */
.sub-text-sm {
  font-size: 0.85rem;
  color: var(--text-sub);
}

.pattern-tag {
  font-family: monospace;
  font-size: 1rem;
  background-color: var(--card-bg);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  color: #f59e0b;
}

/* Buttons & Theme Toggle */
.cta-button {
  display: inline-block;
  background-color: var(--accent-color);
  color: #fff;
  font-weight: 700;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  margin-top: 1rem;
  transition: opacity 0.2s;
}

.cta-button:hover {
  opacity: 0.9;
  text-decoration: none;
}

.theme-toggle-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.35rem 0.75rem;
  border-radius: 20px;
  cursor: pointer;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.2s;
}

.theme-toggle-btn:hover {
  border-color: var(--accent-color);
  color: var(--accent-color);
}

/* Index Page Nav Grid Utility */
.article-header.hero-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 2rem 1rem;
  position: static;
}

.article-header.hero-header .section-title,
.article-header.hero-header .article-title,
.article-header.hero-header .article-meta {
  width: 100%;
}

.article-header.hero-header .article-title {
  font-size: 2.2rem;
  margin-top: 1rem;
  margin-bottom: 0;
}

.nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin: 2rem 0;
}

.nav-card {
  margin-bottom: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.nav-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.nav-card-header h3 {
  margin: 0;
  font-size: 1.2rem;
}

.nav-card-desc {
  font-size: 0.9rem;
  color: var(--text-sub);
  line-height: 1.6;
}

.nav-card-button {
  margin-top: 1rem;
  text-align: center;
  text-decoration: none;
}

/* 본문 내 소제목 유틸리티 */
.sub-label {
  font-size: 0.85rem;
  color: var(--text-main);
  margin-top: 1rem;
  margin-bottom: 0.3rem;
}

/* 콜아웃 상단 간격 조절 */
.callout.mt-1 {
  margin-top: 1rem;
}

/* 아티클 헤더 상단 타이틀/메타 너비 제어 */
.article-header .section-title,
.article-header .article-title,
.article-header .article-meta {
  width: 100%;
}

/* 순서 있는 리스트 (ol) 스타일 */
.callout ol, .episode-card ol {
  padding-left: 1.2rem;
  margin-top: 0.5rem;
  line-height: 1.8;
}

/* 설명용 리스트 (ul) 스타일 */
.episode-card ul {
  padding-left: 1.2rem;
  color: var(--text-sub);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.episode-card ul li {
  margin-bottom: 0.5rem;
}

/* 경고/주의용 콜아웃 (주황색 테두리) */
.callout.callout-warning {
  border-color: #f59e0b;
  background-color: rgba(245, 158, 11, 0.1);
}

/* 소제목 (h4) */
.episode-card h4 {
  color: var(--text-main);
  margin: 1rem 0 0.5rem 0;
  font-size: 1rem;
}

/* 상단 여백 유틸리티 */
.mt-1 {
  margin-top: 1rem;
}

/* 설명용 보수적인 작은 글씨 텍스트 */
.sub-text-sm {
  font-size: 0.85rem;
  color: var(--text-sub);
  margin-top: 0.4rem;
}

.main-text-sm {
  font-size: 0.85rem;
  color: var(--text-main);
  margin-bottom: 0.2rem;
}


/* 서브 배경 및 테두리 박스 유틸리티 */
.bg-sub-card {
  background-color: var(--code-bg);
  border-left: 4px solid var(--accent-color);
  padding: 1rem 1.2rem;
  border-radius: 4px;
}

.bg-sub-card h4 {
  margin: 0 0 0.5rem 0;
  color: var(--text-main);
  font-size: 0.95rem;
}

.bg-sub-card ul {
  padding-left: 1.2rem;
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text-sub);
}

/* 외부 링크 유틸리티 */
.external-link {
  margin-top: 0.4rem;
  font-size: 0.85rem;
}

.external-link a {
  color: var(--accent-color);
  text-decoration: underline;
}

/* 하단 CTA 전용 박스 */
.cta-box {
  margin-top: 2rem;
  padding: 1.5rem;
  background-color: var(--code-bg);
  border-radius: 8px;
  text-align: center;
}

.cta-box p {
  color: var(--text-sub);
  margin-bottom: 1rem;
}

/* Q&A 카드 및 항목 스타일 */
.qna-list {
  margin-top: 1rem;
}

.qna-item-title {
  color: var(--accent-color);
  font-size: 1rem;
  margin-bottom: 0.3rem;
}

.qna-item-desc {
  font-size: 0.9rem;
  color: var(--text-sub);
  margin-bottom: 1.2rem;
}

/* 퀴즈 박스 및 난이도 태그 */
.quiz-card {
  background-color: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.25rem;
  margin: 1.25rem 0;
}

.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.quiz-title {
  color: var(--text-main);
  font-size: 1.05rem;
}

.quiz-desc {
  font-size: 0.9rem;
  color: var(--text-sub);
  margin-bottom: 0.8rem;
}

.quiz-details {
  margin-top: 1rem;
  cursor: pointer;
}

.quiz-summary {
  color: var(--accent-color);
  font-weight: 600;
  font-size: 0.9rem;
}

.quiz-solution {
  margin-top: 0.8rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.9rem;
  color: var(--text-sub);
}

.quiz-solution ul {
  padding-left: 1.2rem;
  margin-top: 0.3rem;
}

/* 난이도별 태그 색상 유틸리티 */
.tag-easy {
  color: #4ade80;
}

.tag-medium {
  color: #f59e0b;
}

.tag-hard {
  color: #f43f5e;
}

/* 기본 CTA 버튼 및 위치 조정 */
.cta-box .cta-button {
  display: inline-block;
  margin-top: 1rem;
}

/* 퀴즈 게임 시작 버튼 강조 스타일 */
.cta-button-highlight {
  background: linear-gradient(135deg, #ff6b6b 0%, #ee5253 100%);
  color: #ffffff !important;
  font-weight: 700;
  font-size: 1.05rem;
  padding: 0.85rem 1.75rem;
  border-radius: 50px;
  box-shadow: 0 4px 15px rgba(238, 82, 83, 0.4);
  transition: all 0.3s ease;
  text-decoration: none;
}

.cta-button-highlight:hover {
  background: linear-gradient(135deg, #ff5252 0%, #d63031 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(238, 82, 83, 0.6);
}

.cta-button-highlight:active {
  transform: translateY(0);
}

footer {
  width: 100%;
  padding: 20px 0;
  margin-top: 50px;
  border-top: 1px solid #e5e5e5;
  text-align: center;
  font-size: 0.875rem;
  color: #666666;
}

.footer-nav {
  margin-top: 8px;
}

.footer-nav a {
  color: #555555;
  text-decoration: none;
  margin: 0 8px;
}

.footer-nav a:hover {
  text-decoration: underline;
  color: #111111;
}