/* CSS 변수 정의 */
:root {
  /* 라이트 모드 색상 */
  --bg-color: #ffffff;
  --text-color: #333333;
  --text-secondary: #666666;
  --border-color: #e0e0e0;
  --header-bg: #f8f9fa;
  --card-bg: #ffffff;
  --link-color: #007bff;
  --code-bg: #f6f8fa;
  --shadow: rgba(0, 0, 0, 0.1);
}

/* 다크 모드 색상 */
[data-theme='dark'] {
  --bg-color: #1a1a1a;
  --text-color: #e0e0e0;
  --text-secondary: #b0b0b0;
  --border-color: #333333;
  --header-bg: #2d2d2d;
  --card-bg: #2d2d2d;
  --link-color: #4dabf7;
  --code-bg: #2d2d2d;
  --shadow: rgba(0, 0, 0, 0.3);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--bg-color);
  transition: background-color 0.3s, color 0.3s;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 헤더 */
.header {
  background-color: var(--header-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 20px 0;
  margin-bottom: 40px;
}

.site-title {
  font-size: 2rem;
  font-weight: bold;
  margin-bottom: 10px;
}

.site-title-link {
  text-decoration: none;
  color: var(--text-color);
}

/* 네비게이션 */
.nav {
  display: flex;
  justify-content: flex-end;
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  cursor: pointer;
  font-size: 18px;
  transition: all 0.3s;
}

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

/* 메인 콘텐츠 */
.main {
  min-height: calc(100vh - 200px);
}

/* 검색 섹션 */
.search-section {
  margin-bottom: 40px;
}

.search-input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 16px;
  background-color: var(--card-bg);
  color: var(--text-color);
  margin-bottom: 20px;
}

.search-input:focus {
  outline: none;
  border-color: var(--link-color);
}

/* 태그 필터 */
.tag-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.tag-button {
  background-color: var(--border-color);
  color: var(--text-color);
  border: none;
  padding: 6px 12px;
  border-radius: 16px;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.3s;
}

.tag-button:hover,
.tag-button.active {
  background-color: var(--link-color);
  color: white;
}

/* 게시글 목록 */
.posts-list {
  display: grid;
  gap: 20px;
}

.post-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 24px;
  box-shadow: 0 2px 4px var(--shadow);
  transition: all 0.3s;
}

.post-card:hover {
  box-shadow: 0 4px 8px var(--shadow);
  transform: translateY(-2px);
}

.post-title {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.post-title a {
  text-decoration: none;
  color: var(--text-color);
}

.post-title a:hover {
  color: var(--link-color);
}

.post-meta {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.post-excerpt {
  color: var(--text-secondary);
  line-height: 1.6;
}

.post-tags {
  margin-top: 12px;
}

.post-tags .tag-button {
  font-size: 12px;
  padding: 4px 8px;
}

/* 게시글 상세 */
.post-content {
  max-width: 100%;
  line-height: 1.8;
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
  margin-top: 2rem;
  margin-bottom: 1rem;
  color: var(--text-color);
}

.post-content h1 {
  font-size: 2.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
}

.post-content h2 {
  font-size: 2rem;
}

.post-content h3 {
  font-size: 1.5rem;
}

.post-content p {
  margin-bottom: 1rem;
}

.post-content ul,
.post-content ol {
  margin-bottom: 1rem;
  padding-left: 2rem;
}

.post-content li {
  margin-bottom: 0.5rem;
}

.post-content blockquote {
  border-left: 4px solid var(--link-color);
  padding-left: 1rem;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--text-secondary);
}

.post-content code {
  background-color: var(--code-bg);
  padding: 2px 4px;
  border-radius: 4px;
  font-family: 'Monaco', 'Menlo', monospace;
  font-size: 0.9em;
}

.post-content pre {
  background-color: var(--code-bg);
  padding: 1rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1rem 0;
}

.post-content pre code {
  background-color: transparent;
  padding: 0;
}

/* Giscus 댓글 */
.giscus-container {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.giscus-container h3 {
  margin-bottom: 1rem;
  color: var(--text-color);
}

/* 푸터 */
.footer {
  background-color: var(--header-bg);
  border-top: 1px solid var(--border-color);
  padding: 20px 0;
  margin-top: 60px;
}

.footer p {
  text-align: center;
  color: var(--text-secondary);
  font-size: 14px;
}

/* 반응형 디자인 */
@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }

  .header {
    padding: 16px 0;
    margin-bottom: 20px;
  }

  .site-title {
    font-size: 1.5rem;
  }

  .post-card {
    padding: 16px;
  }

  .post-content h1 {
    font-size: 2rem;
  }

  .search-section {
    margin-bottom: 20px;
  }
}

@media (max-width: 480px) {
  .post-card {
    padding: 12px;
  }

  .tag-filter {
    gap: 6px;
  }

  .tag-button {
    font-size: 12px;
    padding: 4px 8px;
  }
}

/* 로딩 상태 */
.loading {
  text-align: center;
  padding: 40px;
  color: var(--text-secondary);
}

.error {
  text-align: center;
  padding: 40px;
  color: #dc3545;
  background-color: var(--card-bg);
  border: 1px solid #dc3545;
  border-radius: 8px;
  margin: 20px 0;
}

/* 애니메이션 */
.fade-in {
  animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 프린트 스타일 */
@media print {
  .theme-toggle,
  .nav,
  .giscus-container {
    display: none !important;
  }

  body {
    background-color: white !important;
    color: black !important;
  }

  .post-card {
    box-shadow: none !important;
    border: 1px solid #ccc !important;
  }
}