* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            line-height: 1.7;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(90deg, #1a237e 0%, #311b92 100%);
            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-size: 1.8rem;
            font-weight: 800;
            text-decoration: none;
            color: #ffeb3b;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: transform 0.3s ease;
        }
        .my-logo:hover {
            transform: scale(1.05);
        }
        .my-logo i { font-size: 2rem; }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: #e0e0e0;
            text-decoration: none;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            transition: all 0.3s ease;
        }
        .main-nav a:hover, .main-nav a:focus {
            background-color: rgba(255, 255, 255, 0.15);
            color: #fff;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
        }
        .breadcrumb {
            padding: 1rem 0;
            background-color: #f0f4f8;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
            gap: 0.5rem;
        }
        .breadcrumb li:not(:last-child)::after {
            content: "›";
            margin-left: 0.5rem;
            color: #666;
        }
        .breadcrumb a {
            color: #1a237e;
            text-decoration: none;
        }
        .breadcrumb a:hover { text-decoration: underline; }
        main {
            flex: 1;
            padding: 2rem 0;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
        }
        @media (max-width: 992px) {
            .content-grid { grid-template-columns: 1fr; }
        }
        article {
            background: white;
            border-radius: 12px;
            padding: 2.5rem;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
        }
        article h1 {
            font-size: 2.8rem;
            color: #1a237e;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 3px solid #ffeb3b;
            padding-bottom: 0.5rem;
        }
        article h2 {
            font-size: 2rem;
            color: #311b92;
            margin: 2.5rem 0 1rem;
            padding-top: 1rem;
            border-top: 1px dashed #ccc;
        }
        article h3 {
            font-size: 1.5rem;
            color: #5c6bc0;
            margin: 1.8rem 0 0.8rem;
        }
        article h4 {
            font-size: 1.2rem;
            color: #78909c;
            margin: 1.5rem 0 0.5rem;
        }
        article p {
            margin-bottom: 1.2rem;
            text-align: justify;
        }
        article strong {
            color: #1a237e;
            font-weight: 700;
        }
        article em { font-style: italic; }
        .highlight-box {
            background: linear-gradient(to right, #e3f2fd, #f3e5f5);
            border-left: 5px solid #7e57c2;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .article-img {
            width: 100%;
            max-width: 800px;
            height: auto;
            border-radius: 10px;
            margin: 2rem auto;
            display: block;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            transition: transform 0.5s ease;
        }
        .article-img:hover {
            transform: scale(1.01);
        }
        .link-list {
            background-color: #f8f9fa;
            padding: 1.5rem;
            border-radius: 8px;
            margin: 2rem 0;
        }
        .link-list ul {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 0.8rem;
            list-style: none;
        }
        .link-list a {
            color: #3949ab;
            text-decoration: none;
            padding: 0.5rem;
            display: block;
            border-radius: 4px;
            transition: background 0.3s;
        }
        .link-list a:hover {
            background-color: #e8eaf6;
            text-decoration: underline;
        }
        .update-time {
            font-size: 0.9rem;
            color: #757575;
            text-align: right;
            margin-top: 3rem;
            padding-top: 1rem;
            border-top: 1px solid #e0e0e0;
        }
        aside {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }
        .sidebar-widget {
            background: white;
            border-radius: 10px;
            padding: 1.5rem;
            box-shadow: 0 4px 12px rgba(0,0,0,0.05);
        }
        .sidebar-widget h3 {
            color: #1a237e;
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #ffeb3b;
        }
        .search-form input[type="search"] {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid #c5cae9;
            border-radius: 25px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .search-form input[type="search"]:focus {
            outline: none;
            border-color: #3949ab;
        }
        .search-form button {
            width: 100%;
            margin-top: 10px;
            padding: 12px;
            background: linear-gradient(90deg, #3949ab, #5c6bc0);
            color: white;
            border: none;
            border-radius: 25px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s;
        }
        .search-form button:hover {
            background: linear-gradient(90deg, #303f9f, #3949ab);
        }
        .rating-widget .stars {
            display: flex;
            justify-content: center;
            gap: 5px;
            margin-bottom: 15px;
        }
        .rating-widget .star {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.2s;
        }
        .rating-widget .star:hover,
        .rating-widget .star.active {
            color: #ffc107;
        }
        .rating-form, .comment-form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        .rating-form input, .comment-form input,
        .comment-form textarea {
            padding: 12px;
            border: 1px solid #ccc;
            border-radius: 6px;
            font-size: 1rem;
        }
        .comment-form textarea {
            min-height: 120px;
            resize: vertical;
        }
        .rating-form button, .comment-form button {
            padding: 12px;
            background: #4caf50;
            color: white;
            border: none;
            border-radius: 6px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s;
        }
        .rating-form button:hover, .comment-form button:hover {
            background: #388e3c;
        }
        footer {
            background: #1a1a2e;
            color: #e0e0e0;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-logo {
            font-size: 1.8rem;
            color: #ffeb3b;
            margin-bottom: 1rem;
        }
        .footer-links h4 {
            color: #bb86fc;
            margin-bottom: 1rem;
        }
        .footer-links ul {
            list-style: none;
        }
        .footer-links a {
            color: #b0bec5;
            text-decoration: none;
            display: block;
            padding: 0.3rem 0;
            transition: color 0.3s;
        }
        .footer-links a:hover {
            color: #ffeb3b;
        }
        friend-link {
            display: block;
            background: rgba(255,255,255,0.05);
            padding: 1rem;
            border-radius: 6px;
            margin: 1rem 0;
        }
        friend-link a {
            color: #82b1ff;
            font-weight: 600;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #37474f;
            font-size: 0.9rem;
            color: #90a4ae;
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .main-nav {
                position: fixed;
                top: 70px;
                left: -100%;
                width: 80%;
                height: calc(100vh - 70px);
                background: #1a237e;
                flex-direction: column;
                transition: left 0.3s ease;
                padding: 2rem;
                box-shadow: 5px 0 15px rgba(0,0,0,0.2);
            }
            .main-nav.active { left: 0; }
            .main-nav ul {
                flex-direction: column;
                gap: 1rem;
            }
            article { padding: 1.5rem; }
            article h1 { font-size: 2.2rem; }
            article h2 { font-size: 1.8rem; }
            .content-grid { gap: 2rem; }
        }
        .fade-in {
            animation: fadeIn 0.8s ease-out;
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .visually-hidden {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }