* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.8;
            color: #333;
            background-color: #f8f9fa;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }
        a {
            color: #1a73e8;
            text-decoration: none;
            transition: color 0.3s;
        }
        a:hover {
            color: #0d47a1;
            text-decoration: underline;
        }
        .site-header {
            background: linear-gradient(135deg, #1a237e, #311b92);
            color: white;
            padding: 20px 0;
            border-radius: 0 0 10px 10px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0 20px;
        }
        .my-logo {
            font-size: 2.5rem;
            font-weight: 800;
            letter-spacing: 2px;
            text-transform: uppercase;
            background: linear-gradient(90deg, #ff9800, #ffeb3b);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }
        .my-logo:hover {
            transform: scale(1.05);
            transition: transform 0.3s;
        }
        .nav-container {
            display: flex;
            align-items: center;
        }
        .main-nav {
            display: flex;
            gap: 25px;
            list-style: none;
        }
        .main-nav a {
            color: white;
            font-weight: 600;
            padding: 8px 12px;
            border-radius: 5px;
        }
        .main-nav a:hover {
            background-color: rgba(255,255,255,0.2);
            text-decoration: none;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .breadcrumb {
            padding: 15px 20px;
            background-color: #e3f2fd;
            border-radius: 5px;
            margin: 15px 0;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: #555;
        }
        .content-area {
            display: grid;
            grid-template-columns: 1fr;
            gap: 30px;
            margin: 30px 0;
        }
        article {
            background: white;
            padding: 30px;
            border-radius: 12px;
            box-shadow: 0 6px 15px rgba(0,0,0,0.08);
        }
        h1 {
            font-size: 2.8rem;
            color: #1a237e;
            margin-bottom: 20px;
            border-left: 6px solid #ff9800;
            padding-left: 15px;
            line-height: 1.2;
        }
        h2 {
            font-size: 2rem;
            color: #311b92;
            margin: 30px 0 15px;
            padding-bottom: 8px;
            border-bottom: 3px solid #c5cae9;
        }
        h3 {
            font-size: 1.6rem;
            color: #5e35b1;
            margin: 25px 0 12px;
        }
        h4 {
            font-size: 1.3rem;
            color: #7e57c2;
            margin: 20px 0 10px;
        }
        p {
            margin-bottom: 20px;
            text-align: justify;
            font-size: 1.1rem;
            line-height: 1.9;
        }
        .highlight {
            background-color: #fff9c4;
            padding: 10px;
            border-left: 4px solid #ffd600;
            margin: 20px 0;
            font-weight: bold;
        }
        .image-container {
            text-align: center;
            margin: 30px 0;
        }
        .image-container img {
            max-width: 100%;
            height: auto;
            border-radius: 10px;
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
            transition: transform 0.5s;
        }
        .image-container img:hover {
            transform: scale(1.02);
        }
        .features {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
            margin: 40px 0;
        }
        .feature-box {
            background: white;
            padding: 25px;
            border-radius: 10px;
            box-shadow: 0 4px 10px rgba(0,0,0,0.08);
            text-align: center;
        }
        .feature-box h3 {
            color: #1a237e;
            margin-bottom: 15px;
        }
        .feature-box form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        .feature-box input, .feature-box textarea, .feature-box select {
            padding: 12px;
            border: 1px solid #ccc;
            border-radius: 6px;
            font-size: 1rem;
            width: 100%;
        }
        .feature-box button {
            background: linear-gradient(135deg, #1a237e, #311b92);
            color: white;
            border: none;
            padding: 14px;
            border-radius: 6px;
            font-weight: bold;
            cursor: pointer;
            transition: background 0.3s;
        }
        .feature-box button:hover {
            background: linear-gradient(135deg, #0d1b6e, #1a0d6e);
        }
        footer {
            background: #1a237e;
            color: white;
            padding: 40px 20px;
            border-radius: 10px 10px 0 0;
            margin-top: 50px;
        }
        .footer-content {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 30px;
        }
        .footer-section {
            flex: 1;
            min-width: 250px;
        }
        .footer-section h3 {
            color: #ffeb3b;
            margin-bottom: 20px;
            font-size: 1.5rem;
        }
        friend-link {
            display: block;
            padding: 10px;
            background: rgba(255,255,255,0.1);
            margin: 10px 0;
            border-radius: 5px;
            transition: background 0.3s;
        }
        friend-link:hover {
            background: rgba(255,255,255,0.2);
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255,255,255,0.2);
            margin-top: 30px;
            font-size: 0.9rem;
            opacity: 0.8;
        }
        @media (max-width: 768px) {
            .header-container {
                flex-direction: column;
                align-items: flex-start;
            }
            .nav-container {
                width: 100%;
                justify-content: space-between;
                margin-top: 15px;
            }
            .main-nav {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #311b92;
                position: absolute;
                top: 100px;
                left: 0;
                padding: 20px;
                border-radius: 0 0 10px 10px;
                z-index: 1000;
            }
            .main-nav.active {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            .content-area, .features {
                grid-template-columns: 1fr;
            }
            article {
                padding: 20px;
            }
        }
        .update-time {
            font-style: italic;
            color: #666;
            margin-bottom: 30px;
            text-align: right;
            font-size: 0.95rem;
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 5px;
        }