* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary: #2a4365; 
            --secondary: #f6ad55; 
            --accent: #e53e3e; 
            --light: #f7fafc;
            --dark: #1a202c;
            --gray: #718096;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            --radius: 8px;
            --transition: all 0.3s ease;
            --max-width: 1200px;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            line-height: 1.8;
            color: var(--dark);
            background-color: var(--light);
            overflow-x: hidden;
        }
        a {
            color: var(--accent);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius);
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, var(--primary), #1a365d);
            color: white;
            padding: 1rem 0;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 900;
            color: var(--secondary);
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .my-logo:hover {
            transform: scale(1.05);
            color: white;
        }
        .breadcrumb {
            padding: 1rem 0;
            background-color: #edf2f7;
            font-size: 0.9rem;
            color: var(--gray);
        }
        .breadcrumb a {
            color: var(--primary);
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: var(--radius);
        }
        .main-nav a:hover {
            background-color: rgba(255, 255, 255, 0.1);
            color: var(--secondary);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
        }
        @media (max-width: 768px) {
            .main-nav ul {
                flex-direction: column;
                position: fixed;
                top: 70px;
                right: -100%;
                background: var(--primary);
                width: 80%;
                height: calc(100vh - 70px);
                padding: 2rem;
                transition: var(--transition);
                box-shadow: -5px 0 15px rgba(0,0,0,0.2);
            }
            .main-nav.active ul {
                right: 0;
            }
            .hamburger {
                display: block;
            }
        }
        .hero {
            padding: 3rem 0;
            text-align: center;
            background: linear-gradient(rgba(42, 67, 101, 0.9), rgba(42, 67, 101, 0.8)), url('https://images.unsplash.com/photo-1550745165-9bc0b252726f?ixlib=rb-4.0.3&auto=format&fit=crop&w=1350&q=80') center/cover no-repeat;
            color: white;
        }
        .hero h1 {
            font-size: clamp(2.5rem, 5vw, 4rem);
            margin-bottom: 1rem;
            line-height: 1.2;
        }
        .hero p {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto 2rem;
            opacity: 0.9;
        }
        .search-box {
            max-width: 600px;
            margin: 2rem auto;
            background: white;
            padding: 2rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        .search-box form {
            display: flex;
        }
        .search-box input {
            flex: 1;
            padding: 1rem;
            border: 2px solid #e2e8f0;
            border-radius: var(--radius) 0 0 var(--radius);
            font-size: 1rem;
        }
        .search-box button {
            background: var(--accent);
            color: white;
            border: none;
            padding: 1rem 2rem;
            border-radius: 0 var(--radius) var(--radius) 0;
            cursor: pointer;
            font-weight: 600;
        }
        .search-box button:hover {
            background: #c53030;
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            padding: 3rem 0;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }
        article {
            background: white;
            padding: 2.5rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        h1, h2, h3, h4 {
            color: var(--primary);
            margin-top: 2.5rem;
            margin-bottom: 1rem;
            line-height: 1.3;
        }
        h1 {
            border-bottom: 3px solid var(--secondary);
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 2rem;
            color: var(--accent);
        }
        h3 {
            font-size: 1.5rem;
        }
        h4 {
            font-size: 1.2rem;
            color: var(--gray);
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.25rem;
            font-weight: 500;
            color: var(--primary);
            background: #f0fff4;
            padding: 1.5rem;
            border-left: 5px solid var(--secondary);
            border-radius: 0 var(--radius) var(--radius) 0;
            margin-bottom: 2rem;
        }
        .highlight {
            background-color: #fffaf0;
            padding: 1.5rem;
            border-radius: var(--radius);
            border: 1px dashed var(--secondary);
            margin: 2rem 0;
        }
        .tip {
            background-color: #e6fffa;
            padding: 1.5rem;
            border-radius: var(--radius);
            border-left: 5px solid #38b2ac;
            margin: 2rem 0;
        }
        .tip i {
            color: #38b2ac;
            margin-right: 10px;
        }
        ul, ol {
            margin-left: 2rem;
            margin-bottom: 1.5rem;
        }
        li {
            margin-bottom: 0.5rem;
        }
        .content-link {
            background: #fefcbf;
            padding: 2px 6px;
            border-radius: 4px;
            font-weight: 600;
        }
        .content-link:hover {
            background: var(--secondary);
        }
        .sidebar {
            background: white;
            padding: 2rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            align-self: start;
            position: sticky;
            top: 100px;
        }
        .sidebar h3 {
            color: var(--accent);
            margin-top: 0;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #e2e8f0;
        }
        .sidebar ul {
            list-style: none;
            margin-left: 0;
        }
        .sidebar li {
            margin-bottom: 0.8rem;
        }
        .sidebar a {
            display: block;
            padding: 0.8rem;
            background: #f7fafc;
            border-radius: var(--radius);
            color: var(--dark);
        }
        .sidebar a:hover {
            background: var(--primary);
            color: white;
            transform: translateX(5px);
        }
        .article-img {
            margin: 2.5rem auto;
            max-width: 800px;
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.2);
        }
        .article-img figcaption {
            text-align: center;
            font-style: italic;
            color: var(--gray);
            margin-top: 0.5rem;
        }
        .user-feedback {
            background: white;
            padding: 2.5rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            margin-top: 3rem;
        }
        .rating {
            display: flex;
            align-items: center;
            gap: 1rem;
            margin-bottom: 2rem;
        }
        .stars {
            color: #f6ad55;
            font-size: 1.5rem;
        }
        .stars i {
            cursor: pointer;
            transition: var(--transition);
        }
        .stars i:hover {
            transform: scale(1.2);
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }
        .form-group {
            display: flex;
            flex-direction: column;
        }
        label {
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--primary);
        }
        input, textarea, select {
            padding: 1rem;
            border: 2px solid #e2e8f0;
            border-radius: var(--radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(229, 62, 62, 0.2);
        }
        button[type="submit"] {
            background: var(--primary);
            color: white;
            border: none;
            padding: 1rem 2rem;
            border-radius: var(--radius);
            cursor: pointer;
            font-size: 1.1rem;
            font-weight: 600;
            transition: var(--transition);
        }
        button[type="submit"]:hover {
            background: #1a365d;
            transform: translateY(-3px);
        }
        .site-footer {
            background: var(--dark);
            color: white;
            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 h3 {
            color: var(--secondary);
            margin-top: 0;
            margin-bottom: 1.5rem;
            font-size: 1.3rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #cbd5e0;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background: rgba(255,255,255,0.1);
            padding: 1rem;
            border-radius: var(--radius);
            margin-bottom: 1rem;
            font-weight: 600;
        }
        friend-link a {
            color: var(--secondary);
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #4a5568;
            color: #a0aec0;
            font-size: 0.9rem;
        }
        .update-time {
            background: #fefcbf;
            padding: 1rem;
            border-radius: var(--radius);
            text-align: center;
            margin: 2rem 0;
            color: #744210;
            font-weight: 600;
        }
        .text-center { text-align: center; }
        .mb-2 { margin-bottom: 2rem; }
        .emoji { font-size: 1.2em; }