* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.8;
            color: #333;
            background-color: #f8f9ff;
            background-image: radial-gradient(#e3e7ff 1.5px, transparent 1.5px);
            background-size: 30px 30px;
            padding-top: 70px;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
            color: white;
            box-shadow: 0 4px 20px rgba(106, 17, 203, 0.3);
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 20px;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 900;
            text-decoration: none;
            color: white;
            display: flex;
            align-items: center;
            transition: transform 0.3s ease;
        }
        .my-logo:hover {
            transform: scale(1.05);
        }
        .my-logo i {
            color: #ffcc00;
            margin-right: 10px;
            font-size: 2.5rem;
        }
        .nav-menu {
            display: flex;
            list-style: none;
        }
        .nav-menu li {
            margin-left: 25px;
        }
        .nav-menu a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.1rem;
            padding: 8px 12px;
            border-radius: 5px;
            transition: all 0.3s ease;
            position: relative;
        }
        .nav-menu a:hover, .nav-menu a.active {
            background-color: rgba(255, 255, 255, 0.2);
            color: #ffcc00;
        }
        .nav-menu a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 3px;
            background: #ffcc00;
            transition: all 0.3s ease;
            transform: translateX(-50%);
        }
        .nav-menu a:hover::after {
            width: 80%;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
            padding: 5px;
        }
        .breadcrumb {
            padding: 15px 20px;
            background-color: #eef2ff;
            font-size: 0.95rem;
            border-bottom: 1px solid #d0d7ff;
        }
        .breadcrumb a {
            color: #6a11cb;
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb span {
            color: #666;
        }
        main {
            background-color: white;
            border-radius: 15px;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
            margin: 30px auto;
            padding: 40px;
            overflow: hidden;
        }
        article {
            max-width: 100%;
        }
        h1 {
            font-size: 3.2rem;
            color: #2d2b6d;
            margin-bottom: 25px;
            line-height: 1.2;
            text-align: center;
            border-bottom: 4px double #2575fc;
            padding-bottom: 20px;
        }
        h2 {
            font-size: 2.4rem;
            color: #6a11cb;
            margin-top: 50px;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid #e3e7ff;
        }
        h3 {
            font-size: 1.8rem;
            color: #2575fc;
            margin-top: 35px;
            margin-bottom: 15px;
        }
        h4 {
            font-size: 1.5rem;
            color: #444;
            margin-top: 25px;
            margin-bottom: 10px;
        }
        p {
            margin-bottom: 1.8rem;
            font-size: 1.2rem;
            text-align: justify;
        }
        .intro {
            font-size: 1.4rem;
            color: #555;
            background: #f0f5ff;
            padding: 25px;
            border-left: 5px solid #6a11cb;
            border-radius: 0 10px 10px 0;
            margin-bottom: 40px;
        }
        .highlight {
            background: linear-gradient(120deg, #ffcc00 0%, #ffcc00 100%);
            background-repeat: no-repeat;
            background-size: 100% 0.4em;
            background-position: 0 88%;
            font-weight: 700;
            padding: 0 3px;
        }
        .emoji {
            font-size: 1.3em;
            margin-right: 5px;
        }
        .key-point {
            background: #eef7ff;
            border-left: 4px solid #2575fc;
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 8px 8px 0;
        }
        blockquote {
            font-style: italic;
            color: #555;
            border-left: 4px solid #6a11cb;
            padding-left: 25px;
            margin: 30px 0;
            font-size: 1.3rem;
        }
        a.content-link {
            color: #2575fc;
            text-decoration: none;
            border-bottom: 1px dashed #2575fc;
            padding-bottom: 2px;
            transition: all 0.3s ease;
        }
        a.content-link:hover {
            color: #ff3366;
            border-bottom: 1px solid #ff3366;
        }
        .feature-img {
            width: 100%;
            max-width: 900px;
            height: auto;
            border-radius: 12px;
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
            margin: 40px auto;
            display: block;
            border: 5px solid white;
            outline: 2px solid #e3e7ff;
            transition: transform 0.5s ease;
        }
        .feature-img:hover {
            transform: scale(1.01);
        }
        .interactive-section {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin: 50px 0;
        }
        .feature-box {
            background: linear-gradient(145deg, #f0f5ff, #ffffff);
            border-radius: 12px;
            padding: 30px;
            box-shadow: 0 8px 25px rgba(106, 17, 203, 0.1);
            transition: all 0.4s ease;
            border: 1px solid #dce1ff;
        }
        .feature-box:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(106, 17, 203, 0.2);
        }
        .feature-box h3 {
            color: #6a11cb;
            font-size: 1.8rem;
            margin-top: 0;
        }
        .feature-box form {
            display: flex;
            flex-direction: column;
        }
        .feature-box input, .feature-box textarea, .feature-box select {
            padding: 15px;
            margin-bottom: 15px;
            border: 1px solid #b8c4ff;
            border-radius: 8px;
            font-size: 1.1rem;
            transition: border 0.3s ease;
        }
        .feature-box input:focus, .feature-box textarea:focus, .feature-box select:focus {
            outline: none;
            border-color: #6a11cb;
            box-shadow: 0 0 0 3px rgba(106, 17, 203, 0.2);
        }
        .feature-box button {
            background: linear-gradient(to right, #6a11cb, #2575fc);
            color: white;
            border: none;
            padding: 16px;
            border-radius: 8px;
            font-size: 1.2rem;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        .feature-box button:hover {
            background: linear-gradient(to right, #2575fc, #6a11cb);
            box-shadow: 0 5px 15px rgba(37, 117, 252, 0.4);
        }
        .stars {
            display: flex;
            justify-content: center;
            margin: 20px 0;
            font-size: 2.5rem;
            color: #ffcc00;
            cursor: pointer;
        }
        .stars i {
            margin: 0 5px;
            transition: transform 0.2s ease;
        }
        .stars i:hover {
            transform: scale(1.3);
        }
        footer {
            background: linear-gradient(135deg, #2d2b6d 0%, #1a1a3a 100%);
            color: #ccc;
            padding: 50px 0 20px;
            margin-top: 60px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-section h3 {
            color: #ffcc00;
            font-size: 1.5rem;
            margin-bottom: 25px;
            border-bottom: 2px solid #444;
            padding-bottom: 10px;
        }
        .footer-section p, .footer-section a {
            color: #aaa;
            line-height: 1.8;
            margin-bottom: 15px;
            display: block;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .footer-section a:hover {
            color: #ffcc00;
        }
        friend-link {
            display: block;
            background: rgba(255, 255, 255, 0.05);
            padding: 20px;
            border-radius: 8px;
            margin-top: 10px;
            border-left: 4px solid #6a11cb;
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid #444;
            font-size: 0.95rem;
            color: #888;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.8rem; }
            h2 { font-size: 2.1rem; }
            .header-container { flex-wrap: wrap; }
            .nav-menu {
                display: none;
                flex-direction: column;
                width: 100%;
                background-color: rgba(45, 43, 109, 0.98);
                position: absolute;
                top: 100%;
                left: 0;
                padding: 20px;
                border-top: 2px solid #ffcc00;
            }
            .nav-menu.active {
                display: flex;
            }
            .nav-menu li {
                margin: 10px 0;
            }
            .hamburger {
                display: block;
            }
            .interactive-section {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 768px) {
            body { padding-top: 60px; }
            h1 { font-size: 2.3rem; }
            h2 { font-size: 1.9rem; }
            main { padding: 25px; }
            .feature-box { padding: 20px; }
            .intro { font-size: 1.2rem; padding: 20px; }
            p { font-size: 1.1rem; }
        }