:root {
            --primary-blue: #4361ee;
            --secondary-purple: #7209b7;
            --accent-orange: #f8961e;
            --light-bg: #f8f9fa;
            --dark-text: #212529;
            --gray-border: #dee2e6;
            --success-green: #2ecc71;
            --pyramid-h1: 2.8rem;
            --pyramid-h2: 2.2rem;
            --pyramid-h3: 1.8rem;
            --pyramid-h4: 1.4rem;
            --paragraph-size: 1.125rem;
            --line-height: 1.8;
            --section-spacing: 4rem;
            --mobile-breakpoint: 768px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
        }
        body {
            color: var(--dark-text);
            background-color: var(--light-bg);
            line-height: var(--line-height);
            overflow-x: hidden;
        }
        a {
            color: var(--primary-blue);
            text-decoration: none;
            transition: color 0.3s ease;
        }
        a:hover {
            color: var(--secondary-purple);
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, #1a237e 0%, var(--primary-blue) 100%);
            color: white;
            padding: 1.5rem 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            background: linear-gradient(90deg, #ffd166, var(--accent-orange));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            letter-spacing: -1px;
        }
        .my-logo a {
            background: none;
            -webkit-text-fill-color: inherit;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            cursor: pointer;
            gap: 4px;
            padding: 5px;
        }
        .hamburger span {
            width: 25px;
            height: 3px;
            background-color: white;
            border-radius: 2px;
            transition: 0.3s;
        }
        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(7px, -6px);
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--accent-orange);
            transition: width 0.3s ease;
        }
        .main-nav a:hover::after,
        .main-nav a.active::after {
            width: 100%;
        }
        .breadcrumb {
            padding: 1rem 0;
            background-color: #e9ecef;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '/';
            margin: 0 10px;
            color: #6c757d;
        }
        main {
            padding: 2rem 0;
            min-height: 200vh;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
        }
        @media (max-width: 992px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background: white;
            padding: 3rem;
            border-radius: 16px;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
        }
        h1 {
            font-size: var(--pyramid-h1);
            color: #1a237e;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 3px solid var(--accent-orange);
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: var(--pyramid-h2);
            color: var(--secondary-purple);
            margin: 2.5rem 0 1.5rem;
            padding-top: 1rem;
        }
        h3 {
            font-size: var(--pyramid-h3);
            color: var(--primary-blue);
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: var(--pyramid-h4);
            color: #555;
            margin: 1.5rem 0 0.75rem;
        }
        p, li {
            font-size: var(--paragraph-size);
            margin-bottom: 1.5rem;
        }
        .intro {
            font-size: 1.3rem;
            color: #444;
            font-weight: 500;
            background: linear-gradient(to right, #f8f9fa, #e9f5ff);
            padding: 1.5rem;
            border-left: 5px solid var(--primary-blue);
            border-radius: 0 8px 8px 0;
            margin-bottom: 2.5rem;
        }
        .highlight {
            background-color: #fff9db;
            padding: 1rem;
            border-left: 4px solid var(--accent-orange);
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 5px;
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }
        .widget {
            background: white;
            padding: 1.5rem;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        .widget h3 {
            margin-top: 0;
            font-size: 1.4rem;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .search-form {
            display: flex;
            margin-top: 1rem;
        }
        .search-form input {
            flex: 1;
            padding: 12px 15px;
            border: 2px solid var(--gray-border);
            border-radius: 8px 0 0 8px;
            font-size: 1rem;
            outline: none;
        }
        .search-form input:focus {
            border-color: var(--primary-blue);
        }
        .search-form button {
            background: var(--primary-blue);
            color: white;
            border: none;
            padding: 0 20px;
            border-radius: 0 8px 8px 0;
            cursor: pointer;
            transition: background 0.3s;
        }
        .search-form button:hover {
            background: var(--secondary-purple);
        }
        .rating-widget {
            text-align: center;
        }
        .stars {
            display: flex;
            justify-content: center;
            gap: 5px;
            margin: 1rem 0;
            font-size: 1.8rem;
            color: #ffc107;
        }
        .star {
            cursor: pointer;
            transition: transform 0.2s;
        }
        .star:hover {
            transform: scale(1.2);
        }
        .comment-form textarea {
            width: 100%;
            padding: 15px;
            border: 2px solid var(--gray-border);
            border-radius: 8px;
            font-size: 1rem;
            resize: vertical;
            min-height: 120px;
            margin-bottom: 1rem;
            outline: none;
        }
        .comment-form textarea:focus {
            border-color: var(--primary-blue);
        }
        .comment-form button {
            background: var(--success-green);
            color: white;
            border: none;
            padding: 12px 25px;
            border-radius: 8px;
            cursor: pointer;
            font-weight: 600;
            width: 100%;
            transition: background 0.3s;
        }
        .comment-form button:hover {
            background: #27ae60;
        }
        .article-image {
            width: 100%;
            max-width: 800px;
            margin: 2rem auto;
            display: block;
            border-radius: 12px;
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }
        .internal-links {
            background: #f1f8ff;
            padding: 1.5rem;
            border-radius: 10px;
            margin: 2rem 0;
        }
        .internal-links ul {
            columns: 2;
            list-style-position: inside;
        }
        .internal-links li {
            margin-bottom: 0.75rem;
            break-inside: avoid;
        }
        @media (max-width: 576px) {
            .internal-links ul {
                columns: 1;
            }
        }
        .site-footer {
            background: #1a237e;
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 2rem;
        }
        .footer-section {
            flex: 1;
            min-width: 250px;
        }
        .footer-section h3 {
            color: var(--accent-orange);
            margin-bottom: 1.5rem;
            font-size: 1.4rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #ddd;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
            transition: all 0.3s;
        }
        friend-link {
            display: inline-block;
            background: rgba(255,255,255,0.1);
            padding: 8px 15px;
            border-radius: 6px;
            margin: 5px;
            border: 1px solid rgba(255,255,255,0.2);
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
            color: #aaa;
        }
        .last-updated {
            font-style: italic;
            color: #6c757d;
            text-align: right;
            margin-bottom: 2rem;
            font-size: 0.95rem;
        }
        .mobile-only {
            display: none;
        }
        @media (max-width: 768px) {
            :root {
                --pyramid-h1: 2.2rem;
                --pyramid-h2: 1.9rem;
                --pyramid-h3: 1.6rem;
                --pyramid-h4: 1.3rem;
                --paragraph-size: 1.05rem;
                --section-spacing: 2.5rem;
            }
            .hamburger {
                display: flex;
            }
            .main-nav {
                position: fixed;
                top: 80px;
                left: 0;
                width: 100%;
                background: #1a237e;
                padding: 1rem;
                transform: translateY(-150%);
                opacity: 0;
                transition: transform 0.4s ease, opacity 0.3s ease;
                box-shadow: 0 10px 15px rgba(0,0,0,0.1);
                z-index: 999;
            }
            .main-nav.active {
                transform: translateY(0);
                opacity: 1;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 0;
            }
            .main-nav li {
                width: 100%;
                border-bottom: 1px solid rgba(255,255,255,0.1);
            }
            .main-nav a {
                display: block;
                padding: 1rem;
            }
            .article-content {
                padding: 1.5rem;
            }
            .header-container, .footer-container {
                padding: 0 15px;
            }
            .mobile-only {
                display: block;
            }
        }