 :root {
        --primary-color: #3b82f6;
        --primary-hover: #2563eb;
        --secondary-color: #64748b;
        --accent-color: #f43f5e;
        --light-bg: #f8fafc;
        --dark-bg: #0f172a;
        --border-color: #e2e8f0;
        --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
        --transition: all 0.3s ease;
        --surface: #ffffff;
        --text-primary: #1e293b;
        --text-secondary: #64748b;
    }

    .dark-mode {
        --light-bg: #1e293b;
        --surface: #1e293b;
        --dark-bg: #f8fafc;
        --border-color: #334155;
        --text-primary: #f1f5f9;
        --text-secondary: #94a3b8;
    }

    body {
        background-color: var(--light-bg);
        color: var(--text-primary);
        transition: var(--transition);
        line-height: 1.6;
    }

    .blog-container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 1rem;
    }

    /* Breadcrumb */
    .breadcrumb {
        padding: 1.5rem 0;
        font-size: 0.9rem;
    }

    .breadcrumb a {
        color: var(--text-secondary);
        transition: var(--transition);
        text-decoration: none;
        display: flex;
        align-items: center;
        gap: 0.25rem;
    }

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

    .breadcrumb ol {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        flex-wrap: wrap;
    }

    .breadcrumb li {
        display: flex;
        align-items: center;
        gap: 0.5rem;
    }

    .breadcrumb .separator {
        color: var(--text-secondary);
        font-size: 0.7rem;
    }

    /* Blog Header */
    .blog-header {
        margin-bottom: 3rem;
        position: relative;
    }

    .blog-title {
        font-size: 2.75rem;
        font-weight: 800;
        line-height: 1.2;
        margin-bottom: 1.5rem;
        color: var(--text-primary);
        transition: var(--transition);
    }

    .blog-meta {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        gap: 1.5rem;
        margin-bottom: 1.5rem;
    }

    .meta-item {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        color: var(--text-secondary);
        font-size: 0.9rem;
    }

    .author-info {
        display: flex;
        align-items: center;
        gap: 0.75rem;
    }

    .author-avatar {
        width: 44px;
        height: 44px;
        border-radius: 50%;
        background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
        color: white;
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: bold;
        font-size: 1.1rem;
        box-shadow: var(--card-shadow);
    }

    .tag-list {
        display: flex;
        flex-wrap: wrap;
        gap: 0.5rem;
        margin-bottom: 1.5rem;
    }

    .tag {
        display: inline-flex;
        align-items: center;
        gap: 0.25rem;
        background: var(--surface);
        padding: 0.5rem 1rem;
        border-radius: 2rem;
        font-size: 0.85rem;
        color: var(--text-secondary);
        transition: var(--transition);
        text-decoration: none;
        border: 1px solid var(--border-color);
        box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    }

    .tag:hover {
        background: var(--primary-color);
        color: white;
        transform: translateY(-2px);
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        border-color: var(--primary-color);
    }

    .featured-image {
        border-radius: 1.25rem;
        overflow: hidden;
        box-shadow: var(--card-shadow);
        margin: 2.5rem 0;
        position: relative;
        transition: var(--transition);
    }

    .featured-image img {
        width: 100%;
        height: auto;
        transition: transform 0.5s ease;
        display: block;
    }

    .featured-image:hover {
        box-shadow: 0 15px 30px -5px rgba(0, 0, 0, 0.15);
    }

    .featured-image:hover img {
        transform: scale(1.03);
    }

    /* Blog Content */
    .blog-content {
        line-height: 1.8;
        font-size: 1.125rem;
        color: var(--text-primary);
        transition: var(--transition);
    }

    .blog-content p {
        margin-bottom: 1.5rem;
    }

    .blog-content h2 {
        font-size: 1.875rem;
        font-weight: 700;
        margin-top: 3rem;
        margin-bottom: 1.25rem;
        padding-bottom: 0.5rem;
        border-bottom: 2px solid var(--border-color);
        color: var(--text-primary);
        transition: var(--transition);
    }

    .blog-content h3 {
        font-size: 1.5rem;
        font-weight: 600;
        margin-top: 2.5rem;
        margin-bottom: 1rem;
        color: var(--text-primary);
        transition: var(--transition);
    }

    .blog-content blockquote {
        border-left: 4px solid var(--primary-color);
        padding: 1.5rem 2rem;
        margin: 2.5rem 0;
        font-style: italic;
        background: var(--surface);
        border-radius: 0 0.5rem 0.5rem 0;
        position: relative;
        transition: var(--transition);
        box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    }

    .blog-content blockquote::before {
        content: """;
        position: absolute;
        top: -0.5rem;
        left: 0.5rem;
        font-size: 4rem;
        color: var(--primary-color);
        opacity: 0.2;
        font-family: Georgia, serif;
    }

    .blog-content img {
        border-radius: 0.75rem;
        margin: 2.5rem 0;
        box-shadow: var(--card-shadow);
        max-width: 100%;
        height: auto;
    }

    .blog-content ul, .blog-content ol {
        margin-bottom: 1.5rem;
        padding-left: 1.75rem;
    }

    .blog-content li {
        margin-bottom: 0.75rem;
        position: relative;
    }

    .blog-content ul li::before {
        content: "•";
        color: var(--primary-color);
        font-weight: bold;
        display: inline-block;
        width: 1em;
        margin-left: -1em;
    }

    /* Cards */
    .card {
        background: var(--surface);
        border-radius: 1.25rem;
        padding: 2rem;
        box-shadow: var(--card-shadow);
        transition: var(--transition);
        border: 1px solid var(--border-color);
    }

    .author-card {
        margin: 3rem 0;
        display: flex;
        flex-direction: column;
    }

    .author-header {
        display: flex;
        align-items: center;
        margin-bottom: 1.25rem;
    }

    .social-share {
        margin: 3rem 0;
    }

    .social-share h3 {
        font-size: 1.25rem;
        font-weight: 700;
        margin-bottom: 1.25rem;
        display: flex;
        align-items: center;
        gap: 0.5rem;
        color: var(--text-primary);
    }

    .social-share-buttons {
        display: flex;
        flex-wrap: wrap;
        gap: 0.75rem;
    }

    .social-share-btn {
        width: 3.25rem;
        height: 3.25rem;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        color: white;
        transition: var(--transition);
        position: relative;
        overflow: hidden;
        text-decoration: none;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    }

    .social-share-btn::after {
        content: '';
        position: absolute;
        width: 100%;
        height: 100%;
        background: linear-gradient(rgba(255,255,255,0.1), rgba(255,255,255,0));
        border-radius: 50%;
    }

    .social-share-btn:hover {
        transform: translateY(-0.25rem) scale(1.05);
        box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.2);
    }

    .social-share-btn i {
        position: relative;
        z-index: 1;
        font-size: 1.1rem;
    }

    /* Comments */
    .comments-section {
        margin: 3rem 0;
    }

    .comments-section h2 {
        font-size: 1.75rem;
        font-weight: 700;
        margin-bottom: 1.5rem;
        display: flex;
        align-items: center;
        gap: 0.5rem;
        color: var(--text-primary);
    }

    .comment {
        padding: 1.75rem;
        border-radius: 1.25rem;
        background: var(--surface);
        margin-bottom: 1.5rem;
        transition: var(--transition);
        box-shadow: 0 4px 12px rgba(0,0,0,0.05);
        border: 1px solid var(--border-color);
    }

    .comment-header {
        display: flex;
        align-items: center;
        margin-bottom: 1rem;
    }

    .comment-avatar {
        width: 3.25rem;
        height: 3.25rem;
        border-radius: 50%;
        background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
        color: white;
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: bold;
        margin-right: 1rem;
        flex-shrink: 0;
        box-shadow: var(--card-shadow);
    }

    .replies {
        margin-left: 2.5rem;
        margin-top: 1.5rem;
        padding-left: 1.5rem;
        border-left: 2px solid var(--border-color);
    }

    .reply-form {
        background: var(--surface);
        padding: 1.5rem;
        border-radius: 0.75rem;
        margin-top: 1rem;
        box-shadow: 0 4px 12px rgba(0,0,0,0.05);
        border: 1px solid var(--border-color);
    }

    /* Sidebar */
    .sidebar {
        position: sticky;
        top: 6rem;
    }

    .sidebar-widget {
        margin-bottom: 2.5rem;
    }

    .widget-title {
        font-size: 1.25rem;
        font-weight: 700;
        margin-bottom: 1.25rem;
        padding-bottom: 0.75rem;
        border-bottom: 2px solid var(--border-color);
        display: flex;
        align-items: center;
        gap: 0.5rem;
        color: var(--text-primary);
    }

    .toc-list {
        list-style: none;
        padding: 0;
        margin: 0;
    }

    .toc-item {
        margin-bottom: 0.5rem;
    }

    .toc-link {
        display: block;
        padding: 0.75rem 1rem;
        border-radius: 0.75rem;
        color: var(--text-secondary);
        text-decoration: none;
        transition: var(--transition);
        position: relative;
        padding-left: 1.5rem;
        font-size: 0.95rem;
    }

    .toc-link::before {
        content: "";
        position: absolute;
        left: 0.5rem;
        top: 50%;
        transform: translateY(-50%);
        width: 0.5rem;
        height: 0.5rem;
        border-radius: 50%;
        background: var(--primary-color);
        opacity: 0.7;
        transition: var(--transition);
    }

    .toc-link:hover {
        color: var(--primary-color);
        background: var(--light-bg);
        padding-left: 1.75rem;
    }

    .toc-link:hover::before {
        opacity: 1;
        transform: translateY(-50%) scale(1.2);
    }

    .related-post {
        display: flex;
        gap: 1rem;
        margin-bottom: 1.5rem;
        padding: 1rem;
        border-radius: 1rem;
        transition: var(--transition);
        text-decoration: none;
        color: inherit;
        border: 1px solid transparent;
    }

    .related-post:hover {
        background: var(--light-bg);
        border-color: var(--border-color);
        transform: translateY(-2px);
    }

    .related-post-image {
        width: 5rem;
        height: 4rem;
        border-radius: 0.75rem;
        overflow: hidden;
        flex-shrink: 0;
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    }

    .related-post-image img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform 0.3s ease;
    }

    .related-post:hover .related-post-image img {
        transform: scale(1.1);
    }

    .newsletter-widget {
        background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
        color: white;
        padding: 2.25rem;
        border-radius: 1.25rem;
        box-shadow: var(--card-shadow);
    }

    /* Utilities */
    .divider {
        height: 1px;
        background: var(--border-color);
        margin: 2.5rem 0;
        opacity: 0.7;
    }

    .btn {
        display: inline-flex;
        align-items: center;
        gap: 0.5rem;
        padding: 0.875rem 1.75rem;
        border-radius: 0.875rem;
        font-weight: 500;
        transition: var(--transition);
        cursor: pointer;
        border: none;
        text-decoration: none;
        font-size: 0.95rem;
    }

    .btn-primary {
        background: var(--primary-color);
        color: white;
        box-shadow: 0 4px 6px rgba(59, 130, 246, 0.25);
    }

    .btn-primary:hover {
        background: var(--primary-hover);
        transform: translateY(-2px);
        box-shadow: 0 6px 10px rgba(59, 130, 246, 0.3);
    }

    .btn-outline {
        background: transparent;
        border: 1px solid var(--border-color);
        color: var(--text-secondary);
    }

    .btn-outline:hover {
        border-color: var(--primary-color);
        color: var(--primary-color);
        transform: translateY(-2px);
    }

    /* Dark mode toggle */
    .dark-mode-toggle {
        position: fixed;
        bottom: 2rem;
        right: 2rem;
        width: 3.5rem;
        height: 3.5rem;
        border-radius: 50%;
        background: var(--surface);
        color: var(--text-secondary);
        display: flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        box-shadow: var(--card-shadow);
        z-index: 999;
        transition: var(--transition);
        border: 1px solid var(--border-color);
    }

    .dark-mode-toggle:hover {
        transform: rotate(15deg) scale(1.05);
        color: var(--primary-color);
    }

    /* Forms */
    input, textarea {
        width: 100%;
        padding: 1rem;
        border: 1px solid var(--border-color);
        border-radius: 0.75rem;
        background: var(--surface);
        color: var(--text-primary);
        transition: var(--transition);
        font-family: inherit;
        font-size: 0.95rem;
    }

    input:focus, textarea:focus {
        outline: none;
        border-color: var(--primary-color);
        box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    }

    /* Alert */
    .alert {
        padding: 1.25rem;
        border-radius: 0.875rem;
        margin-bottom: 1.5rem;
        display: flex;
        gap: 0.75rem;
        align-items: flex-start;
        border-left: 4px solid;
    }

    .alert-warning {
        background: #fffbeb;
        border-color: #f59e0b;
        color: #92400e;
    }

    /* Responsive */
    @media (max-width: 1024px) {
        .blog-title {
            font-size: 2.25rem;
        }
    }

    @media (max-width: 768px) {
        .blog-title {
            font-size: 2rem;
        }

        .blog-meta {
            gap: 1rem;
        }

        .sidebar {
            position: static;
        }

        .replies {
            margin-left: 1rem;
        }

        .dark-mode-toggle {
            bottom: 1rem;
            right: 1rem;
            width: 3rem;
            height: 3rem;
        }

        .grid-layout {
            grid-template-columns: 1fr !important;
            gap: 2rem !important;
        }
    }

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

    .animate-in {
        animation: fadeIn 0.5s ease forwards;
    }

    .delay-1 { animation-delay: 0.1s; }
    .delay-2 { animation-delay: 0.2s; }
    .delay-3 { animation-delay: 0.3s; }

    /* Grid Layout */
    .grid-layout {
        display: grid;
        grid-template-columns: 1fr 350px;
        gap: 4rem;
        align-items: start;
    }