*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background: #fafafa;
            color: #212121;
            line-height: 1.75;
        }
        a {
            color: #1a237e;
            text-decoration: none;
            transition: color .2s;
        }
        a:hover {
            color: #d32f2f;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, #1a237e, #283593);
            padding: 14px 0;
            box-shadow: 0 2px 10px rgba(0, 0, 0, .12);
            position: sticky;
            top: 0;
            z-index: 999;
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            max-width: 1300px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: 2px;
            text-transform: uppercase;
            background: rgba(255, 255, 255, .12);
            padding: 6px 18px;
            border-radius: 30px;
            border: 2px solid #ffca28;
            transition: transform .3s;
        }
        .my-logo:hover {
            transform: scale(1.03);
            color: #ffca28;
        }
        .main-nav {
            display: flex;
            gap: 22px;
            align-items: center;
            flex-wrap: wrap;
        }
        .main-nav a {
            color: #e8eaf6;
            font-weight: 500;
            font-size: .92rem;
            padding: 6px 0;
            border-bottom: 2px solid transparent;
            transition: all .2s;
        }
        .main-nav a:hover {
            color: #ffca28;
            border-bottom-color: #ffca28;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.5rem;
            cursor: pointer;
            padding: 4px 10px;
            border-radius: 4px;
        }
        .hamburger:hover {
            background: rgba(255, 255, 255, .1);
        }
        .breadcrumb-wrap {
            background: #eceff1;
            padding: 10px 0;
            border-bottom: 1px solid #cfd8dc;
        }
        .breadcrumb {
            max-width: 1300px;
            margin: 0 auto;
            padding: 0 20px;
            font-size: .85rem;
            color: #546e7a;
        }
        .breadcrumb a {
            color: #1a237e;
        }
        .breadcrumb a:hover {
            color: #d32f2f;
        }
        .breadcrumb span {
            margin: 0 8px;
            color: #90a4ae;
        }
        .main-wrapper {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 40px;
            max-width: 1300px;
            margin: 30px auto;
            padding: 0 20px;
        }
        @media(max-width:900px) {
            .main-wrapper {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }
        .article-content {
            background: #fff;
            border-radius: 12px;
            padding: 40px 34px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, .05);
        }
        .article-content h1 {
            font-size: 2.2rem;
            color: #1a237e;
            margin-bottom: 12px;
            line-height: 1.3;
            border-left: 5px solid #d32f2f;
            padding-left: 16px;
        }
        .article-content h2 {
            font-size: 1.6rem;
            color: #1a237e;
            margin: 42px 0 14px;
            padding-bottom: 8px;
            border-bottom: 2px solid #e0e0e0;
            position: relative;
        }
        .article-content h2::after {
            content: "";
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 60px;
            height: 2px;
            background: #d32f2f;
        }
        .article-content h3 {
            font-size: 1.2rem;
            color: #37474f;
            margin: 26px 0 10px;
        }
        .article-content h4 {
            font-size: 1.05rem;
            color: #455a64;
            margin: 18px 0 8px;
            font-style: italic;
        }
        .article-content p {
            margin-bottom: 16px;
            text-align: justify;
        }
        .article-content ul,
        .article-content ol {
            margin: 10px 0 20px 24px;
        }
        .article-content li {
            margin-bottom: 6px;
        }
        .highlight-box {
            background: #fff8e1;
            border-left: 4px solid #ffca28;
            padding: 16px 18px;
            border-radius: 0 8px 8px 0;
            margin: 24px 0;
            font-style: italic;
        }
        .tip-box {
            background: #e8f5e9;
            border-left: 4px solid #388e3c;
            padding: 16px 18px;
            border-radius: 0 8px 8px 0;
            margin: 24px 0;
        }
        .warning-box {
            background: #ffebee;
            border-left: 4px solid #d32f2f;
            padding: 16px 18px;
            border-radius: 0 8px 8px 0;
            margin: 24px 0;
        }
        .infographic {
            background: #f5f5f5;
            border-radius: 10px;
            padding: 20px;
            margin: 30px 0;
            text-align: center;
        }
        .infographic img {
            border-radius: 8px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, .1);
        }
        .featured-image {
            margin: 24px 0;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 4px 20px rgba(0, 0, 0, .08);
        }
        .featured-image img {
            width: 100%;
            display: block;
        }
        .featured-image figcaption {
            font-size: .85rem;
            color: #777;
            padding: 10px 14px;
            background: #f5f5f5;
            text-align: center;
        }
        .rule-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
            margin: 24px 0;
        }
        .rule-card {
            background: #f5f7fa;
            border-radius: 10px;
            padding: 20px;
            text-align: center;
            border-top: 4px solid #1a237e;
            transition: transform .2s;
        }
        .rule-card:hover {
            transform: translateY(-4px);
        }
        .rule-card i {
            font-size: 2rem;
            color: #d32f2f;
            margin-bottom: 10px;
        }
        .rule-card h4 {
            font-size: 1rem;
            margin: 6px 0;
            color: #1a237e;
        }
        .rule-card p {
            font-size: .88rem;
            color: #555;
            margin: 0;
        }
        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 24px 0;
            font-size: .92rem;
        }
        .comparison-table th,
        .comparison-table td {
            border: 1px solid #e0e0e0;
            padding: 10px 14px;
            text-align: left;
        }
        .comparison-table th {
            background: #1a237e;
            color: #fff;
            font-weight: 600;
        }
        .comparison-table tr:nth-child(even) {
            background: #f5f7fa;
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 24px;
            position: sticky;
            top: 80px;
            align-self: start;
            max-height: calc(100vh - 100px);
            overflow-y: auto;
        }
        .sidebar-card {
            background: #fff;
            border-radius: 12px;
            padding: 22px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, .04);
        }
        .sidebar-card h3 {
            font-size: 1.1rem;
            color: #1a237e;
            margin-bottom: 12px;
            border-bottom: 2px solid #eee;
            padding-bottom: 8px;
        }
        .sidebar-card ul {
            list-style: none;
            margin-left: 0;
        }
        .sidebar-card li {
            margin-bottom: 8px;
        }
        .sidebar-card a {
            font-size: .9rem;
        }
        .toc-link {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .toc-link i {
            color: #d32f2f;
            font-size: .8rem;
        }
        .interactive-section {
            background: #fff;
            border-radius: 12px;
            padding: 30px;
            margin-top: 30px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, .05);
        }
        .interactive-section h2 {
            font-size: 1.4rem;
            color: #1a237e;
            margin-bottom: 16px;
            border-bottom: 2px solid #eee;
            padding-bottom: 10px;
        }
        .search-form {
            display: flex;
            gap: 10px;
            margin-top: 14px;
        }
        .search-form input[type="text"] {
            flex: 1;
            padding: 12px 16px;
            border: 2px solid #e0e0e0;
            border-radius: 30px;
            font-size: .95rem;
            outline: none;
            transition: border .2s;
        }
        .search-form input[type="text"]:focus {
            border-color: #1a237e;
        }
        .search-form button {
            background: #1a237e;
            color: #fff;
            border: none;
            padding: 12px 22px;
            border-radius: 30px;
            cursor: pointer;
            font-weight: 600;
            transition: background .2s;
        }
        .search-form button:hover {
            background: #d32f2f;
        }
        .comment-form textarea {
            width: 100%;
            padding: 14px;
            border: 2px solid #e0e0e0;
            border-radius: 8px;
            font-size: .95rem;
            min-height: 120px;
            resize: vertical;
            font-family: inherit;
        }
        .comment-form input {
            width: 100%;
            padding: 10px 14px;
            border: 2px solid #e0e0e0;
            border-radius: 8px;
            margin-bottom: 12px;
            font-size: .92rem;
        }
        .comment-form button {
            background: #388e3c;
            color: #fff;
            border: none;
            padding: 10px 28px;
            border-radius: 30px;
            cursor: pointer;
            font-weight: 600;
            transition: background .2s;
        }
        .comment-form button:hover {
            background: #2e7d32;
        }
        .rating-form {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .rating-stars {
            display: flex;
            gap: 6px;
            font-size: 1.6rem;
            color: #ffa000;
            cursor: pointer;
            user-select: none;
        }
        .rating-stars i {
            transition: transform .15s;
        }
        .rating-stars i:hover {
            transform: scale(1.2);
        }
        .rating-form button {
            background: #ff8f00;
            color: #fff;
            border: none;
            padding: 10px 28px;
            border-radius: 30px;
            cursor: pointer;
            font-weight: 600;
            transition: background .2s;
        }
        .rating-form button:hover {
            background: #ef6c00;
        }
        .site-footer {
            background: #1a237e;
            color: #c5cae9;
            padding: 40px 0 20px;
            margin-top: 50px;
        }
        .footer-inner {
            max-width: 1300px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 30px;
            margin-bottom: 30px;
        }
        .footer-col h4 {
            color: #fff;
            margin-bottom: 12px;
            font-size: 1rem;
        }
        .footer-col a {
            color: #9fa8da;
            display: block;
            margin-bottom: 6px;
            font-size: .88rem;
        }
        .footer-col a:hover {
            color: #ffca28;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, .1);
            padding-top: 20px;
            text-align: center;
            font-size: .82rem;
            color: #9fa8da;
        }
        friend-link {
            display: block;
            padding: 12px 0;
            font-size: .9rem;
        }
        friend-link a {
            margin: 0 6px;
            color: #ffca28;
        }
        friend-link a:hover {
            color: #fff;
        }
        @media(max-width:768px) {
            .header-inner {
                padding: 0 12px;
            }
            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                background: #1a237e;
                padding: 10px 0;
                border-radius: 0 0 12px 12px;
                gap: 0;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 12px 20px;
                border-bottom: 1px solid rgba(255, 255, 255, .1);
                width: 100%;
            }
            .hamburger {
                display: block;
            }
            .article-content {
                padding: 24px 18px;
            }
            .article-content h1 {
                font-size: 1.7rem;
            }
            .article-content h2 {
                font-size: 1.3rem;
            }
            .breadcrumb {
                font-size: .78rem;
            }
            .search-form {
                flex-direction: column;
            }
        }
        @media(max-width:480px) {
            .article-content h1 {
                font-size: 1.4rem;
            }
            .article-content p {
                font-size: .95rem;
            }
            .rule-grid {
                grid-template-columns: 1fr;
            }
        }