/* CSS 변수를 사용하여 색상 및 폰트를 쉽게 변경할 수 있도록 설정 */
:root {
    --bg-dark: #0A0A0A;
    --bg-secondary: #1A1A1A;
    --text-primary: #FFFFFF;
    --text-secondary: #A1A1A1;
    --accent: #FFFFFF;
    --font-eng: 'Inter', sans-serif;
    --font-kor: 'Noto Sans KR', sans-serif;
    
    /* 블로그 테마 색상 */
    --blog-bg: #FFFFFF;
    --blog-bg-secondary: #F8F9FA;
    --blog-text-primary: #1A1A1A;
    --blog-text-secondary: #6B7280;
    --blog-text-muted: #9CA3AF;
    --blog-border: #E5E7EB;
    --blog-border-light: #F3F4F6;
    --blog-accent: #3B82F6;
    --blog-accent-hover: #2563EB;
    --blog-code-bg: #F1F5F9;
    --blog-code-border: #CBD5E1;
}

/* 기본 스타일 (포트폴리오용) */
body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-eng), var(--font-kor);
    margin: 0;
    overflow-x: hidden;
    line-height: 1.6;
}

/* 블로그 테마 오버라이드 */
body.blog-theme {
    background-color: var(--blog-bg);
    color: var(--blog-text-primary);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 100px 0;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-eng), var(--font-kor);
    font-weight: 700;
    margin: 0;
}

p {
    color: var(--text-secondary);
    font-size: 16px;
    line-height: 1.7;
    margin: 0;
}

.blog-theme p {
    color: var(--blog-text-secondary);
}

/* 프로필 원형 이미지 */
.profile-circle {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 16px;
    background: #fff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.07);
}
.profile-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    display: block;
}

/* 헤더 */
.header {
    padding: 12px 0;
    position: fixed;
    width: 100%;
    z-index: 100;
    background: rgba(10, 10, 10, 0.7);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.blog-theme .header {
    top: 0;
    margin: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--blog-border);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo { 
    font-size: 22px; 
    font-weight: 700; 
    color: var(--text-primary);
}

.blog-theme .logo {
    color: var(--blog-text-primary);
}

.nav {
    display: flex;
    align-items: center;
    gap: 16px;
}

.nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    transition: color 0.2s;
    padding: 8px 16px;
    border-radius: 6px;
}

.blog-theme .nav a {
    color: var(--blog-text-secondary);
}

.nav a:hover { 
    color: var(--text-primary); 
}

.blog-theme .nav a:hover {
    color: var(--blog-accent);
    background-color: var(--blog-bg-secondary);
}

/* 언어 선택 버튼 */
.lang-btn {
    background: none;
    border: 1px solid var(--text-secondary);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
}

.blog-theme .lang-btn {
    border-color: var(--blog-border);
    color: var(--blog-text-secondary);
}

.lang-btn:hover {
    background-color: var(--text-secondary);
    color: var(--bg-dark);
}

.blog-theme .lang-btn:hover {
    background-color: var(--blog-accent);
    color: white;
    border-color: var(--blog-accent);
}

.lang-btn.active {
    background-color: var(--accent);
    color: var(--bg-dark);
    border-color: var(--accent);
}

.blog-theme .lang-btn.active {
    background-color: var(--blog-accent);
    color: white;
    border-color: var(--blog-accent);
}

/* === 블로그 레이아웃 === */
.blog-layout {
    display: flex;
    min-height: calc(100vh - 80px);
    margin-top: 60px;
    background-color: var(--blog-bg);
}

/* 사이드바 */
.blog-theme .sidebar {
    width: 300px;
    background-color: #FFFFFF;
    border-right: 1px solid #E5E7EB;
    overflow-y: auto;
    position: fixed;
    height: calc(100vh - 60px);
    left: 0;
    top: 60px;
}

.blog-theme .sidebar-header {
    padding: 24px 20px 12px;
    border-bottom: 1px solid #E5E7EB;
    background-color: #FFFFFF;
}

.blog-theme .sidebar-header h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--blog-text-primary);
    margin: 0;
}

.blog-theme .sidebar-content {
    padding: 12px 0;
}

/* 카테고리 스타일 */
.blog-theme .sidebar .category {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    padding: 12px 20px;
    margin: 2px 0;
    transition: background-color 0.2s;
    user-select: none;
}

.blog-theme .sidebar .category:hover {
    background-color: #F3F4F6;
}

.blog-theme .sidebar .category.active {
    background-color: #3B82F6;
    color: white;
}

.blog-theme .category-title {
    display: flex;
    align-items: center;
    font-weight: 600;
    font-size: 15px;
    color: #1A1A1A;
}

.sidebar .category.active .category-title {
    color: white;
}

.folder-icon {
    margin-right: 8px;
    font-size: 14px;
    opacity: 0.7;
}

.toggle-icon {
    font-size: 12px;
    transition: transform 0.2s ease;
    opacity: 0.6;
}

.sidebar .category.active .toggle-icon {
    opacity: 0.9;
}

/* 게시글 목록 */
.post-list {
    list-style: none;
    padding: 0;
    margin: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.post-list.open {
    max-height: 1000px;
    padding: 4px 0 8px 0;
}

.post-list li {
    margin: 0;
}

.post-list li a {
    display: block;
    padding: 8px 20px 8px 48px;
    color: #6B7280;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

.post-list li a:hover {
    background-color: #F3F4F6;
    color: #1A1A1A;
    border-left-color: #3B82F6;
}

.post-list li a.selected {
    background-color: #3B82F6;
    color: white;
    border-left-color: #2563EB;
    font-weight: 600;
}

/* 메인 콘텐츠 */
.main-content {
    flex: 1;
    margin-left: 300px;
    background-color: var(--blog-bg);
}

.post-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 32px;
}

/* 게시글 내용 */
.post-content {
    background-color: var(--blog-bg);
    min-height: 400px;
}

/* 플레이스홀더 및 에러메시지 */
.post-placeholder, .error-message, .loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 300px;
    color: var(--blog-text-muted);
    text-align: center;
}

.post-placeholder i, .error-message i, .loading i {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.post-placeholder p, .error-message p {
    font-size: 18px;
    margin: 0;
}

/* === 마크다운 스타일링 === */
.markdown-content {
    font-family: var(--font-eng), var(--font-kor);
    line-height: 1.7;
    color: var(--blog-text-primary);
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4,
.markdown-content h5,
.markdown-content h6 {
    color: var(--blog-text-primary);
    margin: 32px 0 16px 0;
    font-weight: 700;
    line-height: 1.3;
}

.markdown-content h1 {
    font-size: 32px;
    border-bottom: 2px solid var(--blog-border);
    padding-bottom: 12px;
    margin-bottom: 24px;
}

.markdown-content h2 {
    font-size: 26px;
    border-bottom: 1px solid var(--blog-border-light);
    padding-bottom: 8px;
}

.markdown-content h3 {
    font-size: 22px;
}

.markdown-content h4 {
    font-size: 18px;
}

.markdown-content p {
    margin: 16px 0;
    color: var(--blog-text-secondary);
    font-size: 16px;
}

.markdown-content a {
    color: var(--blog-accent);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
}

.markdown-content a:hover {
    border-bottom-color: var(--blog-accent);
}

.markdown-content ul,
.markdown-content ol {
    margin: 16px 0;
    padding-left: 24px;
}

.markdown-content li {
    margin: 8px 0;
    color: var(--blog-text-secondary);
}

.markdown-content blockquote {
    margin: 20px 0;
    padding: 16px 20px;
    background-color: var(--blog-bg-secondary);
    border-left: 4px solid var(--blog-accent);
    border-radius: 0 6px 6px 0;
}

.markdown-content blockquote p {
    margin: 0;
    font-style: italic;
    color: var(--blog-text-secondary);
}

/* 코드 스타일링 */
.markdown-content code {
    background-color: var(--blog-code-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    color: var(--blog-text-primary);
    border: 1px solid var(--blog-code-border);
}

.markdown-content pre {
    background-color: var(--blog-code-bg);
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 20px 0;
    border: 1px solid var(--blog-code-border);
    position: relative;
}

.markdown-content pre code {
    background: none;
    padding: 0;
    border: none;
    font-size: 14px;
    line-height: 1.5;
}

/* 코드 복사 버튼 */
.copy-btn {
    position: absolute;
    top: 12px;
    right: 12px;
    background: var(--blog-bg);
    border: 1px solid var(--blog-border);
    border-radius: 4px;
    padding: 6px 8px;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.2s;
    color: var(--blog-text-secondary);
}

.copy-btn:hover {
    background-color: var(--blog-accent);
    color: white;
    border-color: var(--blog-accent);
}

/* 테이블 스타일링 */
.markdown-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    background-color: var(--blog-bg);
    border: 1px solid var(--blog-border);
    border-radius: 6px;
    overflow: hidden;
}

.markdown-content th,
.markdown-content td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--blog-border-light);
}

.markdown-content th {
    background-color: var(--blog-bg-secondary);
    font-weight: 600;
    color: var(--blog-text-primary);
}

.markdown-content td {
    color: var(--blog-text-secondary);
}

.markdown-content tr:last-child td {
    border-bottom: none;
}

/* 이미지 스타일링 */
.markdown-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 20px 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* 푸터 */
.footer {
    background-color: var(--bg-secondary);
    padding: 50px 0;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.blog-theme .footer {
    background-color: var(--blog-bg-secondary);
    border-top: 1px solid var(--blog-border);
}

.footer-links {
    margin-bottom: 20px;
}

.footer-links a {
    color: var(--text-secondary);
    margin: 0 15px;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.blog-theme .footer-links a {
    color: var(--blog-text-secondary);
}

.footer-links a:hover {
    color: var(--text-primary);
}

.blog-theme .footer-links a:hover {
    color: var(--blog-accent);
}

.footer p {
    font-size: 14px;
    margin: 0;
    color: var(--text-secondary);
}

.blog-theme .footer p {
    color: var(--blog-text-muted);
}

/* 반응형 디자인 */
@media (max-width: 1024px) {
    .sidebar {
        width: 280px;
    }
    
    .main-content {
        margin-left: 280px;
    }
    
    .post-container {
        padding: 32px 24px;
    }
}

@media (max-width: 768px) {
    .sidebar {
        position: relative;
        width: 100%;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--blog-border);
        top: 0;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .blog-layout {
        flex-direction: column;
    }
    
    .post-container {
        padding: 24px 16px;
    }
    
    .sidebar-header {
        padding: 16px;
    }
    
    .post-list li a {
        padding: 8px 16px 8px 32px;
    }
    
    .sidebar .category {
        padding: 10px 16px;
    }
    
    .header .container {
        padding: 0 16px;
    }
    
    .nav {
        gap: 8px;
    }
    
    .nav a {
        padding: 6px 12px;
        font-size: 14px;
    }
    
    .lang-btn {
        padding: 4px 8px;
        font-size: 12px;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 18px;
    }
    
    .markdown-content h1 {
        font-size: 24px;
    }
    
    .markdown-content h2 {
        font-size: 20px;
    }
    
    .markdown-content h3 {
        font-size: 18px;
    }
    
    .post-container {
        padding: 16px 12px;
    }
    
    .markdown-content p {
        font-size: 15px;
    }
    
    .markdown-content pre {
        padding: 12px;
        font-size: 13px;
    }
}

/* 스크롤바 커스터마이징 (블로그 테마) */
.blog-theme .sidebar::-webkit-scrollbar {
    width: 6px;
}

.blog-theme .sidebar::-webkit-scrollbar-track {
    background: #FFFFFF;
}

.blog-theme .sidebar::-webkit-scrollbar-thumb {
    background-color: #E5E7EB;
    border-radius: 3px;
}

.blog-theme .sidebar::-webkit-scrollbar-thumb:hover {
    background-color: #9CA3AF;
}

/* 애니메이션 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.markdown-content {
    animation: fadeIn 0.3s ease-out;
}

.post-placeholder,
.error-message,
.loading {
    animation: fadeIn 0.3s ease-out;
}

/* 포커스 스타일 */
.lang-btn:focus,
.nav a:focus,
.post-list li a:focus,
.sidebar .category:focus {
    outline: 2px solid var(--blog-accent);
    outline-offset: 2px;
}

/* 선택 불가 텍스트 */
.sidebar-header h3,
.category-title,
.toggle-icon {
    user-select: none;
}

/* 호버 효과 개선 */
.sidebar .category,
.post-list li a,
.lang-btn,
.nav a {
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 로딩 스피너 애니메이션 */
.loading i.fa-spinner {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* 코드 언어 라벨 (선택사항) */
.markdown-content pre[class*="language-"]::before {
    content: attr(class);
    position: absolute;
    top: 8px;
    right: 50px;
    font-size: 11px;
    background: var(--blog-text-muted);
    color: white;
    padding: 2px 6px;
    border-radius: 3px;
    text-transform: uppercase;
    font-weight: 500;
}

/* 인라인 코드 개선 */
.markdown-content p code,
.markdown-content li code {
    word-break: break-word;
}

/* 긴 URL 처리 */
.markdown-content a {
    word-break: break-word;
}

/* 리스트 마커 색상 */
.markdown-content ul li::marker,
.markdown-content ol li::marker {
    color: var(--blog-accent);
}

/* 강조 텍스트 */
.markdown-content strong {
    color: var(--blog-text-primary);
    font-weight: 600;
}

.markdown-content em {
    color: var(--blog-text-secondary);
    font-style: italic;
}

/* 구분선 */
.markdown-content hr {
    border: none;
    border-top: 1px solid var(--blog-border);
    margin: 32px 0;
}

/* 포트폴리오 관련 기존 스타일들 (기존 코드 유지) */
.tag {
    display: inline-block;
    padding: 6px 14px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 20px;
}

.hero {
    min-height: 100vh;
    padding: 0;
    display: flex;
    align-items: center;
    position: relative;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    align-items: center;
    gap: 60px;
}

.hero-text {
    margin-top: 140px;
}

.hero-text h1 {
    font-size: 50px;
    line-height: 1.2;
    margin: 10px 0;
}

.hero-text p {
    font-size: 18px;
    margin-bottom: 32px;
}

.hero-image {
    position: absolute;
    right: 0;
    width: 50vw;
    height: 100vh;
    z-index: -1;
}

.hero-image img {
    top: -100px;
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 0;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    background-color: var(--accent);
    color: var(--bg-dark);
    text-decoration: none;
    border-radius: 30px;
    font-weight: 700;
    transition: transform 0.2s;
}

.cta-button:hover {
    transform: scale(1.05);
}

/* 기타 포트폴리오 스타일들은 기존 유지... */

/* 소개 및 통계 섹션 */
.about-intro { text-align: center; max-width: 700px; margin: 0 auto 80px; }
.about-intro h2 { font-size: 42px; }
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    text-align: center;
}
.stat-item h3 {
    font-size: 60px;
    margin: 0 0 10px;
    color: var(--text-primary);
}
.stat-item p { margin: 0; font-size: 16px; }

section.skills-section {
    background-color: #fff !important;
}
section.skills-section, section.skills-section h2, section.skills-section p {
    color: #222;
}
section.skills-section .tag {
    color: #222 !important;
    background-color: rgba(0,0,0,0.06);
}

.skill-item {
    background: rgb(255, 255, 255);
    backdrop-filter: blur(4px);
    border-radius: 0.5rem;
    padding: 1.5rem;
    text-align: center;
    transition: all 0.3s;
}
.skill-item:hover {
    background: rgba(255,255,255,0.9);
    transform: translateY(-1px);
}


.accordion-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-size: 22px;
    font-weight: 500;
}
.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out, padding-top 0.3s ease-out;
}
.accordion-content p {
    margin: 0;
    padding-top: 16px;
}
.accordion-item.active .accordion-content {
    max-height: 200px; /* 충분한 높이 설정 */
}
.accordion-icon {
    font-size: 28px;
    transition: transform 0.3s;
}
.accordion-item.active .accordion-icon {
    transform: rotate(45deg);
}

/* 연락처 섹션 */
.contact { text-align: center; }
.contact h2 { font-size: 42px; }
.contact p { max-width: 500px; margin: 20px auto 40px; }

/* 연락처 버튼 가로 정렬 */
.contact-links {
    display: flex;
    flex-direction: row;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
    margin-top: 32px;
}

/* Experience/Education 카드 스타일 */
.experience-grid {
    display: flex;
    gap: 48px;
    align-items: flex-start;
    margin-top: 40px;
}
.exp-left, .exp-right {
    flex: 1 1 0;
    min-width: 0;
}
.exp-list, .edu-list, .cert-list {
    list-style: none;
    padding: 0;
    margin: 0 0 24px 0;
    display: flex;
    flex-direction: column;
    gap: 32px;
}
.exp-job {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}
.exp-logo {
    width: 48px;
    height: 48px;
    object-fit: contain;
    border-radius: 12px;
    background: #222;
}
.exp-main {
    flex: 1;
}
.exp-company {
    font-size: 18px;
    font-weight: 700;
    color: #fff;
}
.exp-role {
    font-size: 15px;
    color: #bbb;
    margin-top: 2px;
    font-weight: 500;
}
.exp-period {
    font-size: 14px;
    color: #888;
    margin-top: 2px;
}
.edu-list .exp-logo {
    background: #fff;
}

.cert-list {
    gap: 24px;
}
.cert-item {
    display: flex;
    align-items: center;
    gap: 16px;
    background: rgba(255,255,255,0.04);
    border-radius: 10px;
    padding: 12px 16px;
}
.cert-icon {
    width: 36px;
    height: 36px;
    object-fit: contain;
    border-radius: 8px;
    background: #fff;
}
.cert-name {
    font-size: 16px;
    font-weight: 600;
    color: #fff;
}
.cert-date {
    font-size: 13px;
    color: #aaa;
}
@media (max-width: 900px) {
    .experience-grid {
        flex-direction: column;
        gap: 32px;
    }
    .exp-left, .exp-right {
        width: 100%;
    }
}

.exp-card {
    background: transparent;
    border-radius: 0;
    box-shadow: none;
    padding: 32px 0;
    margin-bottom: 0;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}
.exp-header {
    display: flex;
    align-items: center;
    gap: 20px;
    justify-content: space-between;
    flex-wrap: wrap;
}
.exp-logo {
    width: 48px;
    height: 48px;
    object-fit: contain;
    border-radius: 12px;
    background: #f5f5f5;
}
.exp-company {
    font-size: 20px;
    font-weight: 700;
    color: #fff;
}
.exp-role {
    font-size: 15px;
    color: var(--text-secondary);
    margin-top: 2px;
    font-weight: 500;
}
.exp-period {
    font-size: 14px;
    color: #888;
    min-width: 120px;
    text-align: right;
}
.exp-desc {
    margin: 20px 0 0 68px;
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
    padding-left: 0;
}
.exp-desc li {
    margin-bottom: 6px;
    list-style: disc inside;
}
@media (max-width: 600px) {
    .exp-header { flex-direction: column; align-items: flex-start; gap: 10px; }
    .exp-desc { margin-left: 0; }
}


/* 푸터 */
.footer {
    background-color: var(--bg-secondary);
    padding: 50px 0;
    text-align: center;
}
.footer-links a { color: var(--text-secondary); margin: 0 15px; text-decoration: none; }
.footer-links { margin-bottom: 20px; }
.footer p { font-size: 14px; margin: 0; }

/* 반응형 디자인 */
@media (max-width: 992px) {
    .hero-grid, .skills-grid { grid-template-columns: 1fr; }
    .hero-text { text-align: center; }
    .hero-image { display: none; } /* 모바일에서는 히어로 이미지 숨김 */
}

/* 프로젝트 슬라이더 스타일 */
.project-slider {
    width: 100%;
    overflow: hidden;
    padding: 40px 0;
    /* 슬라이더 양 옆을 자연스럽게 가리는 마스크 효과 */
    -webkit-mask-image: linear-gradient(to right, transparent, white 10%, white 90%, transparent);
    mask-image: linear-gradient(to right, transparent, white 10%, white 90%, transparent);
}

.slider-track {
    display: flex;
    /* (이미지 너비 + 갭) * 총 이미지 개수 */
    width: calc(350px * 10); 
    animation: scrollAnimation 40s linear infinite;
}

/* 마우스를 올리면 애니메이션 일시 정지 */
.project-slider:hover .slider-track {
    animation-play-state: paused;
}

.slide {
    width: 330px; /* 이미지 너비 */
    margin: 0 10px; /* 이미지 간격 */
    flex-shrink: 0;
}

.slide img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    border-radius: 12px;
}

/* --- 사이드바 스타일 --- */
.sidebar {
    width: 280px;
    background-color: var(--bg-secondary);
    border-right: 1px solid rgba(255,255,255,0.1);
    height: calc(100vh - 80px);
    overflow-y: auto;
    padding: 24px 16px;
    font-size: 16px;
    position: fixed;
    top: 80px; /* header 높이 맞춰서 조정 필요 */
    left: 0;
    box-sizing: border-box;
    user-select: none;
}

/* 카테고리 제목 */
.sidebar .category {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-weight: 700;
    color: var(--accent);
    padding: 10px 8px;
    border-radius: 8px;
    margin-bottom: 6px;
    transition: background-color 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.sidebar .category:hover {
    background-color: rgba(59, 130, 246, 0.1);
}

/* 접기/펼치기 아이콘 */
.sidebar .category .toggle-icon {
    font-size: 20px;
    transition: transform 0.3s ease;
}

/* 접힌 상태 아이콘 회전 */
.sidebar .category.active .toggle-icon {
    transform: rotate(90deg);
}

/* 게시글 리스트 (하위 항목) */
.sidebar ul.post-list {
    list-style: none;
    padding-left: 20px;
    margin-top: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), 
                padding 0.4s cubic-bezier(0.4, 0, 0.2, 1),
                opacity 0.3s ease;
}

/* 펼쳐진 게시글 리스트 */
.sidebar ul.post-list.open {
    max-height: 1000px; /* 충분한 최대 높이 */
    padding-top: 8px;
}

/* 게시글 항목 */
.sidebar ul.post-list li {
    margin-bottom: 6px;
}

/* 게시글 링크 */
.sidebar ul.post-list li a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 6px 12px;
    display: block;
    border-radius: 6px;
    font-weight: 500;
    font-size: 14px;
    transition: background-color 0.2s, color 0.2s;
}

/* 게시글 링크 호버 */
.sidebar ul.post-list li a:hover {
    color: var(--accent);
    background-color: rgba(21, 4, 104, 0.1);
}

/* 선택된 게시글 강조 */
.sidebar ul.post-list li a.selected {
    background-color: var(--accent);
    color: var(--bg-dark);
    font-weight: 700;
}

/* 카테고리 구분선 */
.sidebar .divider {
    height: 1px;
    background-color: rgba(255, 255, 255, 0.12);
    margin: 16px 0;
}

/* 카테고리 제목 앞 폴더 아이콘 */
.sidebar .category .folder-icon {
    margin-right: 10px;
    font-size: 18px;
    color: var(--accent);
}

/* 스크롤바 스타일 (웹킷) */
.sidebar::-webkit-scrollbar {
    width: 6px;
}
.sidebar::-webkit-scrollbar-track {
    background: transparent;
}
.sidebar::-webkit-scrollbar-thumb {
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
}

.blog-theme .sidebar .category .folder-icon {
    color: var(--blog-accent); /* 파란색 */
}

/* 토글 아이콘 회전 애니메이션 개선 */
.toggle-icon {
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 반응형: 900px 이하에서 사이드바 숨김 */
@media (max-width: 900px) {
    .sidebar {
        position: relative;
        width: 100%;
        height: auto;
        border-right: none;
        padding: 0 16px;
        top: 0;
    }
}


/* 스크롤 애니메이션 정의 */
@keyframes scrollAnimation {
    0% {
        transform: translateX(0);
    }
    100% {
        /* (이미지 너비 + 갭) * 원본 이미지 개수 만큼 이동 */
        transform: translateX(calc(-350px * 5));
    }
}