/* 블로그 CSS 변수 (메인 테마 연동) */
:root {
    --card-bg: rgba(255, 255, 255, 0.03);
    --text-color: #ffffff;
    --text-muted: #a0a0b0;
    --primary-color: #00f3ff;
    --secondary-color: #bd00ff;
    --code-bg: #1e1e1e;
    --code-inline-bg: #2d2d2d;
    --border-color: #333;
    --sidebar-width: 280px;
    --sidebar-bg: rgba(10, 10, 18, 0.85);
    --sidebar-hover: rgba(255, 255, 255, 0.06);
    --sidebar-active-bg: rgba(0, 243, 255, 0.08);
    --sidebar-active-border: var(--primary-color);
}

[data-theme="light"] {
    --card-bg: rgba(0, 0, 0, 0.03);
    --text-color: #1a1a2e;
    --text-muted: #555570;
    --primary-color: #0097a7;
    --secondary-color: #7b1fa2;
    --code-bg: #f0f0f5;
    --code-inline-bg: #e8e8f0;
    --border-color: #ddd;
    --sidebar-bg: rgba(245, 245, 250, 0.92);
    --sidebar-hover: rgba(0, 0, 0, 0.04);
    --sidebar-active-bg: rgba(0, 151, 167, 0.08);
}

/* ===== Docs-style 2-column Layout ===== */
.blog-layout {
    display: flex;
    min-height: 100vh;
    padding-top: 90px;
}

/* ===== Sidebar ===== */
.blog-sidebar {
    position: fixed;
    top: 90px;
    left: 0;
    width: var(--sidebar-width);
    height: calc(100vh - 90px);
    overflow-y: auto;
    background: var(--sidebar-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 0;
    border: none;
    border-right: 1px solid var(--border-color);
    box-shadow: none;
    z-index: 100;
    padding: 1.5rem 0;
    scrollbar-width: thin;
    scrollbar-color: rgba(255,255,255,0.1) transparent;
}

.blog-sidebar::-webkit-scrollbar {
    width: 4px;
}
.blog-sidebar::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.1);
    border-radius: 2px;
}

.sidebar-close {
    display: none;
}

.sidebar-content {
    padding: 0 1rem;
}

.sidebar-title {
    font-family: var(--font-ui, 'Rajdhani', sans-serif);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-muted);
    padding: 0 0.75rem 1rem;
    margin-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

/* Category Toggle */
.sidebar-category {
    margin-bottom: 0.25rem;
}

.category-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.6rem 0.75rem;
    background: transparent;
    border: none;
    color: var(--text-color);
    font-family: var(--font-ui, 'Rajdhani', sans-serif);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: 6px;
    text-align: left;
    letter-spacing: 0.5px;
    transition: background 0.2s;
}

.category-toggle:hover {
    background: var(--sidebar-hover);
}

.toggle-icon {
    flex-shrink: 0;
    transition: transform 0.2s ease;
    opacity: 0.5;
}

/* Post Links */
.category-posts {
    list-style: none;
    padding: 0 0 0.5rem 0;
    margin: 0;
}

.category-posts li {
    margin: 0;
}

.sidebar-link {
    display: block;
    padding: 0.45rem 0.75rem 0.45rem 2rem;
    font-size: 0.88rem;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: 6px;
    border-left: 2px solid transparent;
    transition: all 0.2s ease;
    line-height: 1.4;
    font-family: var(--font-body, 'Pretendard', sans-serif);
}

.sidebar-link:hover {
    color: var(--text-color);
    background: var(--sidebar-hover);
}

.sidebar-link.active {
    color: var(--primary-color);
    background: var(--sidebar-active-bg);
    border-left-color: var(--sidebar-active-border);
    font-weight: 600;
}

/* Sidebar Toggle (mobile) */
.sidebar-toggle {
    display: none;
    position: fixed;
    bottom: 24px;
    left: 24px;
    z-index: 200;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background: var(--sidebar-bg);
    backdrop-filter: blur(12px);
    color: var(--text-color);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    transition: all 0.3s;
}

.sidebar-toggle:hover {
    border-color: var(--primary-color);
    box-shadow: 0 0 20px rgba(0,243,255,0.2);
}

/* ===== Blog Content Area ===== */
.blog-layout .blog-container {
    margin-left: var(--sidebar-width);
    max-width: 860px;
    padding: 2rem 3rem 3rem;
    min-height: calc(100vh - 90px);
    flex: 1;
}

/* ===== Blog List ===== */
.blog-list h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.blog-description {
    color: var(--text-muted);
    margin-bottom: 3rem;
}

.post-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin-bottom: 1.25rem;
    transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
}

.post-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.08);
    border-color: var(--primary-color);
}

.post-card a {
    display: block;
    padding: 1.5rem 2rem;
    text-decoration: none;
    color: inherit;
}

.post-card h2 {
    font-size: 1.3rem;
    margin-bottom: 0.4rem;
    color: var(--text-color);
    text-transform: none;
    letter-spacing: 0;
}

.post-card time {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.post-card p {
    margin-top: 0.75rem;
    color: var(--text-muted);
    line-height: 1.6;
    font-size: 0.95rem;
}

/* 카테고리 뱃지 */
.post-categories {
    margin-top: 0.75rem;
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.category {
    background: var(--primary-color);
    color: white;
    padding: 0.2rem 0.65rem;
    border-radius: 2rem;
    font-size: 0.7rem;
    text-decoration: none;
    font-weight: 600;
    letter-spacing: 0.5px;
}

/* ===== Single Post ===== */
.post-single {
    padding-top: 1rem;
}

.post-header h1 {
    font-size: 2.2rem;
    margin-bottom: 1rem;
    line-height: 1.3;
    text-transform: none;
    letter-spacing: 0;
}

.post-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
}

.post-content {
    line-height: 1.85;
    font-size: 1.05rem;
}

.post-content h1 {
    margin-top: 3rem;
    margin-bottom: 1rem;
    font-size: 1.8rem;
    color: var(--primary-color);
    text-transform: none;
    letter-spacing: 0;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.post-content h2 {
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    font-size: 1.5rem;
    color: var(--primary-color);
    text-transform: none;
    letter-spacing: 0;
}

.post-content h3 {
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
    text-transform: none;
    letter-spacing: 0;
}

.post-content p {
    margin-bottom: 1.25rem;
}

.post-content ul,
.post-content ol {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
}

.post-content li {
    margin-bottom: 0.3rem;
    line-height: 1.7;
}

.post-content blockquote {
    border-left: 3px solid var(--primary-color);
    padding: 0.75rem 1.25rem;
    margin: 1.5rem 0;
    background: var(--sidebar-active-bg);
    border-radius: 0 8px 8px 0;
    color: var(--text-muted);
    font-style: italic;
}

.post-content strong {
    color: var(--text-color);
}

.post-content hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 2.5rem 0;
}

.post-content code {
    background: var(--code-inline-bg);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-size: 0.88em;
}

.post-content pre {
    background: var(--code-bg);
    padding: 1.25rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1.5rem 0;
    border: 1px solid var(--border-color);
}

.post-content pre code {
    background: none;
    padding: 0;
}

/* 태그 */
.post-tags {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.tag {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.85rem;
    padding: 0.2rem 0.6rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    transition: all 0.2s;
}

.tag:hover {
    background: var(--sidebar-active-bg);
    border-color: var(--primary-color);
}

/* 푸터 */
.footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .blog-sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        box-shadow: none;
    }
    .blog-sidebar.open {
        transform: translateX(0);
        box-shadow: 4px 0 30px rgba(0,0,0,0.4);
    }
    .sidebar-close {
        display: block;
        position: absolute;
        top: 1rem;
        right: 1rem;
        background: transparent;
        border: none;
        color: var(--text-muted);
        font-size: 1.5rem;
        cursor: pointer;
        width: 32px;
        height: 32px;
        border-radius: 50%;
        transition: all 0.2s;
    }
    .sidebar-close:hover {
        color: var(--text-color);
        background: var(--sidebar-hover);
    }
    .sidebar-toggle {
        display: flex;
    }
    .blog-layout .blog-container {
        margin-left: 0;
        padding: 2rem 1.5rem 3rem;
    }
}

@media (max-width: 640px) {
    .blog-list h1 {
        font-size: 2rem;
    }
    .post-header h1 {
        font-size: 1.6rem;
    }
    .post-content {
        font-size: 1rem;
    }
    .blog-layout .blog-container {
        padding: 1.5rem 1rem 3rem;
    }
}