* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background-color: #f9f7f1;
            background-image: radial-gradient(#e0dcd0 1px, transparent 1px);
            background-size: 20px 20px;
        }
        a { color: #2a5c9e; text-decoration: none; transition: color 0.3s; }
        a:hover { color: #e35a1c; }
        img { max-width: 100%; height: auto; display: block; }
        ul, ol { padding-left: 1.5em; margin: 1em 0; }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
        .site-header {
            background-color: #1a365d;
            color: white;
            padding: 1rem 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-family: 'Georgia', serif;
            font-size: 2.2rem;
            font-weight: bold;
            color: #fbbf24;
            text-shadow: 2px 2px 0 #2a5c9e;
            letter-spacing: 1px;
        }
        .my-logo:hover { color: #ffffff; }
        .nav-toggle { display: none; }
        .nav-toggle-label {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: #fbbf24;
        }
        .primary-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .primary-nav a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 0.75rem;
            border-radius: 4px;
        }
        .primary-nav a:hover,
        .primary-nav a:focus {
            background-color: #2a5c9e;
            color: #fbbf24;
        }
        .breadcrumb {
            padding: 1rem 0;
            background-color: #e8e5da;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .breadcrumb li:not(:last-child)::after {
            content: "›";
            margin: 0 10px;
            color: #666;
        }
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            padding: 2rem 0;
        }
        @media (max-width: 992px) {
            main { grid-template-columns: 1fr; }
        }
        .article-content {
            background: white;
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0,0,0,0.08);
        }
        .article-content h1 {
            color: #1a365d;
            font-size: 2.8rem;
            margin-bottom: 1rem;
            line-height: 1.2;
            border-bottom: 3px solid #fbbf24;
            padding-bottom: 0.5rem;
        }
        .article-content h2 {
            color: #2a5c9e;
            font-size: 2rem;
            margin: 2.5rem 0 1rem;
            padding-top: 1rem;
        }
        .article-content h3 {
            color: #e35a1c;
            font-size: 1.5rem;
            margin: 2rem 0 1rem;
        }
        .article-content h4 {
            color: #555;
            font-size: 1.2rem;
            margin: 1.5rem 0 0.75rem;
        }
        .article-content p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .article-content blockquote {
            border-left: 5px solid #fbbf24;
            padding-left: 1.5rem;
            margin: 2rem 0;
            font-style: italic;
            color: #555;
            background-color: #f9f7f1;
            padding: 1.5rem;
            border-radius: 0 8px 8px 0;
        }
        .highlight-box {
            background: linear-gradient(135deg, #e3f2fd, #f3e5f5);
            border-left: 6px solid #2a5c9e;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .updated-time {
            font-size: 0.9rem;
            color: #666;
            text-align: right;
            font-style: italic;
            margin-top: 3rem;
            padding-top: 1rem;
            border-top: 1px dashed #ccc;
        }
        .sidebar {
            background: white;
            padding: 2rem;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0,0,0,0.08);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        .widget {
            margin-bottom: 2.5rem;
        }
        .widget h3 {
            color: #1a365d;
            font-size: 1.3rem;
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #fbbf24;
        }
        .search-form input[type="search"] {
            width: 100%;
            padding: 12px;
            border: 2px solid #ddd;
            border-radius: 6px;
            font-size: 1rem;
        }
        .search-form button {
            width: 100%;
            margin-top: 10px;
            padding: 12px;
            background-color: #2a5c9e;
            color: white;
            border: none;
            border-radius: 6px;
            cursor: pointer;
            font-weight: bold;
            transition: background 0.3s;
        }
        .search-form button:hover { background-color: #1a365d; }
        .rating-form .stars {
            display: flex;
            justify-content: space-around;
            margin: 1rem 0;
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
        }
        .rating-form .stars .star:hover,
        .rating-form .stars .star.active { color: #fbbf24; }
        .rating-form input, .comment-form textarea, .comment-form input {
            width: 100%;
            padding: 10px;
            margin-bottom: 10px;
            border: 1px solid #ccc;
            border-radius: 6px;
        }
        .rating-form button, .comment-form button {
            background-color: #e35a1c;
            color: white;
            border: none;
            padding: 12px 20px;
            border-radius: 6px;
            cursor: pointer;
            width: 100%;
            font-weight: bold;
            transition: background 0.3s;
        }
        .rating-form button:hover, .comment-form button:hover { background-color: #c2410c; }
        .link-list ul {
            list-style: none;
            padding-left: 0;
        }
        .link-list li {
            margin-bottom: 0.75rem;
            padding-left: 1.5rem;
            position: relative;
        }
        .link-list li::before {
            content: "🔍";
            position: absolute;
            left: 0;
        }
        .link-list a {
            color: #333;
            display: block;
            padding: 0.5rem;
            border-radius: 4px;
            background-color: #f5f3eb;
        }
        .link-list a:hover {
            background-color: #e8e5da;
            color: #2a5c9e;
        }
        .site-footer {
            background-color: #1a365d;
            color: #ddd;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h4 {
            color: #fbbf24;
            margin-bottom: 1.2rem;
            font-size: 1.2rem;
        }
        friend-link {
            display: inline-block;
            background: #2a5c9e;
            color: white;
            padding: 0.5rem 1rem;
            margin: 0.3rem;
            border-radius: 4px;
            font-size: 0.9rem;
        }
        friend-link:hover {
            background: #e35a1c;
            color: white;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #2a5c9e;
            font-size: 0.9rem;
            color: #aaa;
        }
        @media (max-width: 768px) {
            .header-container { flex-wrap: wrap; }
            .nav-toggle-label {
                display: block;
                order: 2;
            }
            .primary-nav {
                order: 3;
                width: 100%;
                display: none;
            }
            .primary-nav ul {
                flex-direction: column;
                padding-top: 1rem;
            }
            .nav-toggle:checked ~ .primary-nav {
                display: block;
            }
            .article-content {
                padding: 1.5rem;
            }
            .article-content h1 {
                font-size: 2.2rem;
            }
            .sidebar {
                position: static;
            }
        }
        .emoji { font-size: 1.2em; margin-right: 5px; }
        .keyword { font-weight: bold; color: #1a365d; background-color: #e3f2fd; padding: 2px 6px; border-radius: 3px; }
        .puzzle-image {
            border: 8px solid #fbbf24;
            border-radius: 10px;
            margin: 2rem auto;
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
            max-width: 700px;
        }
        .puzzle-image figcaption {
            text-align: center;
            font-style: italic;
            color: #666;
            margin-top: 0.5rem;
        }