* { 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: #2c3e50;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a { color: #2980b9; text-decoration: none; transition: color 0.3s ease; }
        a:hover { color: #1a5276; text-decoration: underline; }
        img { max-width: 100%; height: auto; display: block; }
        .site-header {
            background: linear-gradient(90deg, #1a237e, #283593);
            color: white;
            padding: 1rem 2rem;
            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;
            max-width: 1400px;
            margin: 0 auto;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            background: linear-gradient(to right, #ffcc00, #ff9900);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            letter-spacing: 1px;
            text-shadow: 0 2px 4px rgba(0,0,0,0.2);
        }
        .my-logo a { color: inherit; text-decoration: none; }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: #e3f2fd;
            font-weight: 600;
            padding: 0.5rem 0.8rem;
            border-radius: 4px;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .main-nav a:hover {
            background: rgba(255,255,255,0.15);
            text-decoration: none;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .breadcrumb {
            background: #e8f4fc;
            padding: 0.8rem 2rem;
            font-size: 0.9rem;
            border-bottom: 1px solid #d1e3f1;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            max-width: 1400px;
            margin: 0 auto;
        }
        .breadcrumb li:not(:last-child)::after {
            content: "›";
            margin: 0 0.7rem;
            color: #7f8c8d;
        }
        .main-content {
            flex: 1;
            max-width: 1400px;
            margin: 2rem auto;
            padding: 0 2rem;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
        }
        @media (max-width: 1024px) {
            .main-content { grid-template-columns: 1fr; }
        }
        .article-container {
            background: white;
            border-radius: 12px;
            padding: 3rem;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-bottom: 2px solid #f1f8ff;
            padding-bottom: 1.5rem;
            margin-bottom: 2.5rem;
            flex-wrap: wrap;
            gap: 1rem;
        }
        .update-time {
            background: #e8f6f3;
            color: #1d8348;
            padding: 0.5rem 1rem;
            border-radius: 20px;
            font-size: 0.9rem;
            font-weight: 600;
        }
        h1 {
            font-size: 2.8rem;
            color: #1a237e;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-left: 5px solid #ff9800;
            padding-left: 1.5rem;
        }
        h2 {
            font-size: 2rem;
            color: #283593;
            margin: 3rem 0 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px dashed #dbeafe;
        }
        h3 {
            font-size: 1.6rem;
            color: #3949ab;
            margin: 2.5rem 0 1rem;
        }
        h4 {
            font-size: 1.3rem;
            color: #5c6bc0;
            margin: 2rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            font-size: 1.1rem;
        }
        .highlight {
            background: linear-gradient(120deg, #fff9c4 0%, #fff9c4 100%);
            padding: 1.5rem;
            border-left: 4px solid #ffb300;
            border-radius: 0 8px 8px 0;
            margin: 2rem 0;
        }
        .featured-image {
            width: 100%;
            border-radius: 10px;
            overflow: hidden;
            margin: 2.5rem 0;
            box-shadow: 0 8px 20px rgba(0,0,0,0.1);
        }
        .featured-image img {
            width: 100%;
            height: 400px;
            object-fit: cover;
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: #7b8a8b;
            padding: 0.8rem;
            background: #f8f9fa;
            font-size: 0.95rem;
        }
        .link-box {
            background: #f0f7ff;
            border: 1px solid #cce7ff;
            border-radius: 10px;
            padding: 1.5rem;
            margin: 2rem 0;
        }
        .link-box h4 { margin-top: 0; color: #1565c0; }
        .link-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1rem;
            margin-top: 1rem;
        }
        .link-list a {
            display: block;
            padding: 0.8rem;
            background: white;
            border-radius: 6px;
            border: 1px solid #e1f5fe;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .link-list a:hover {
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            text-decoration: none;
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }
        .sidebar-widget {
            background: white;
            border-radius: 12px;
            padding: 1.8rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .widget-title {
            font-size: 1.3rem;
            color: #1a237e;
            margin-bottom: 1.5rem;
            padding-bottom: 0.7rem;
            border-bottom: 2px solid #ffcc00;
            display: flex;
            align-items: center;
            gap: 0.7rem;
        }
        .search-form {
            display: flex;
        }
        .search-form input {
            flex: 1;
            padding: 0.9rem;
            border: 2px solid #d1d8e0;
            border-radius: 8px 0 0 8px;
            font-size: 1rem;
        }
        .search-form button {
            background: linear-gradient(90deg, #2980b9, #1a5276);
            color: white;
            border: none;
            padding: 0 1.5rem;
            border-radius: 0 8px 8px 0;
            cursor: pointer;
            font-weight: 600;
            transition: opacity 0.3s;
        }
        .search-form button:hover { opacity: 0.9; }
        .rating-form, .comment-form {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        .rating-form label, .comment-form label {
            font-weight: 600;
            color: #2c3e50;
        }
        .stars {
            display: flex;
            gap: 0.5rem;
            font-size: 1.8rem;
            color: #ffcc00;
            cursor: pointer;
        }
        .star:hover { transform: scale(1.2); }
        textarea, input[type="text"], input[type="email"] {
            width: 100%;
            padding: 0.9rem;
            border: 2px solid #e0e6ed;
            border-radius: 8px;
            font-family: inherit;
            font-size: 1rem;
            transition: border 0.3s;
        }
        textarea:focus, input:focus { outline: none; border-color: #3498db; }
        .submit-btn {
            background: linear-gradient(90deg, #27ae60, #229954);
            color: white;
            border: none;
            padding: 1rem 2rem;
            border-radius: 8px;
            font-weight: 700;
            cursor: pointer;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .submit-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(39, 174, 96, 0.4);
        }
        .site-footer {
            background: linear-gradient(90deg, #1a237e, #0d153a);
            color: #ecf0f1;
            padding: 3rem 2rem 1.5rem;
            margin-top: 4rem;
        }
        .footer-content {
            max-width: 1400px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 3rem;
            margin-bottom: 2.5rem;
        }
        .footer-logo {
            font-size: 2rem;
            font-weight: 800;
            color: #ffcc00;
            margin-bottom: 1rem;
        }
        friend-link {
            display: block;
            background: rgba(255,255,255,0.05);
            padding: 1rem;
            border-radius: 6px;
            margin-bottom: 0.8rem;
            transition: background 0.3s;
        }
        friend-link:hover {
            background: rgba(255,255,255,0.1);
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
            color: #bdc3c7;
        }
        @media (max-width: 768px) {
            .header-container { flex-wrap: wrap; }
            .main-nav { display: none; width: 100%; order: 3; margin-top: 1rem; }
            .main-nav.active { display: block; }
            .main-nav ul { flex-direction: column; gap: 0; }
            .main-nav li { border-bottom: 1px solid rgba(255,255,255,0.1); }
            .main-nav a { padding: 1rem; }
            .hamburger { display: block; }
            .article-container { padding: 1.5rem; }
            h1 { font-size: 2.2rem; padding-left: 1rem; }
            h2 { font-size: 1.8rem; }
            h3 { font-size: 1.5rem; }
            .main-content { padding: 0 1rem; }
        }
        .emoji { font-size: 1.2em; margin-right: 0.3rem; }
        .key-term {
            background: #e3f2fd;
            padding: 0.2rem 0.5rem;
            border-radius: 4px;
            font-weight: 700;
            color: #1565c0;
        }
        .tip {
            background: #e8f5e9;
            border-left: 5px solid #4caf50;
            padding: 1rem 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .interview {
            background: #f3e5f5;
            padding: 2rem;
            border-radius: 10px;
            margin: 2.5rem 0;
            border: 1px solid #ce93d8;
        }
        .interview strong { color: #7b1fa2; }