* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f8f9fa;
            max-width: 100%;
            overflow-x: hidden;
        }
        img { max-width: 100%; height: auto; display: block; }
        h1, h2, h3, h4 { color: #1a1a1a; margin-bottom: 0.75rem; line-height: 1.3; }
        h1 { font-size: 2.5rem; margin-top: 1.5rem; }
        h2 { font-size: 2rem; margin-top: 2rem; padding-bottom: 0.5rem; border-bottom: 2px solid #e0e0e0; }
        h3 { font-size: 1.5rem; margin-top: 1.5rem; }
        h4 { font-size: 1.25rem; margin-top: 1.25rem; }
        p { margin-bottom: 1rem; }
        a { color: #0066cc; text-decoration: none; transition: color 0.2s; }
        a:hover { color: #004080; text-decoration: underline; }
        strong { font-weight: 700; }
        em { font-style: italic; }
        ul, ol { margin-left: 2rem; margin-bottom: 1rem; }
        li { margin-bottom: 0.5rem; }
        blockquote {
            border-left: 4px solid #ccc;
            padding-left: 1rem;
            margin: 1.5rem 0;
            color: #555;
            font-style: italic;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1rem;
        }
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2rem;
            margin: 2rem auto;
        }
        @media (max-width: 768px) {
            main { grid-template-columns: 1fr; }
        }
        header {
            background: linear-gradient(135deg, #0d47a1, #2196f3);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 800;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo a { color: white; text-decoration: none; }
        .my-logo i { color: #ffcc00; }
        nav ul {
            display: flex;
            list-style: none;
            margin: 0;
            gap: 1.5rem;
        }
        nav a {
            color: white;
            font-weight: 500;
            padding: 0.5rem;
            border-radius: 4px;
            transition: background-color 0.2s;
        }
        nav a:hover {
            background-color: rgba(255,255,255,0.2);
            text-decoration: none;
        }
        .hamburger {
            display: none;
            font-size: 1.5rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        @media (max-width: 768px) {
            nav ul {
                flex-direction: column;
                width: 100%;
                display: none;
                background-color: #0d47a1;
                padding: 1rem;
                border-radius: 5px;
                margin-top: 1rem;
            }
            nav ul.active { display: flex; }
            .hamburger { display: block; }
        }
        .content-section {
            background: white;
            padding: 2rem;
            border-radius: 8px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.05);
            margin-bottom: 2rem;
        }
        .content-section h2:first-child { margin-top: 0; }
        aside {
            background: white;
            padding: 1.5rem;
            border-radius: 8px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.05);
            height: fit-content;
            position: sticky;
            top: 100px;
        }
        .info-box {
            border: 1px solid #e0e0e0;
            padding: 1rem;
            background: #f9f9f9;
            border-radius: 5px;
            margin-bottom: 1.5rem;
        }
        .info-box h3 {
            margin-top: 0;
            text-align: center;
            border-bottom: 1px solid #ccc;
            padding-bottom: 0.5rem;
        }
        .info-box ul { list-style: none; margin-left: 0; }
        .info-box li { margin-bottom: 0.75rem; }
        .info-box .label { font-weight: bold; display: inline-block; width: 100px; }
        .button, button {
            display: inline-block;
            background: #2196f3;
            color: white;
            padding: 0.75rem 1.5rem;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-weight: 600;
            text-align: center;
            transition: background-color 0.2s, transform 0.2s;
            min-height: 44px;
            min-width: 44px;
        }
        .button:hover, button:hover {
            background: #0d47a1;
            transform: translateY(-2px);
            text-decoration: none;
            color: white;
        }
        .button-secondary {
            background: #6c757d;
        }
        .button-secondary:hover {
            background: #545b62;
        }
        .form-group {
            margin-bottom: 1rem;
        }
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        input, textarea, select {
            width: 100%;
            padding: 0.75rem;
            border: 1px solid #ccc;
            border-radius: 4px;
            font-family: inherit;
            font-size: 1rem;
        }
        textarea {
            min-height: 120px;
            resize: vertical;
        }
        .social-share {
            display: flex;
            gap: 0.5rem;
            margin: 1.5rem 0;
        }
        .social-share a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            background: #eee;
            border-radius: 50%;
            color: #333;
            font-size: 1.2rem;
            transition: background-color 0.2s;
        }
        .social-share a:hover {
            background: #ddd;
            text-decoration: none;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: #2196f3;
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            box-shadow: 0 3px 10px rgba(0,0,0,0.2);
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.3s, visibility 0.3s;
            z-index: 999;
        }
        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }
        footer {
            background: #1a1a1a;
            color: #ddd;
            padding: 3rem 0 2rem;
            margin-top: 3rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
        }
        footer h3 {
            color: white;
            margin-bottom: 1rem;
            border-bottom: none;
        }
        friend-link {
            display: block;
            margin-bottom: 0.5rem;
        }
        friend-link a {
            color: #4da6ff;
        }
        .copyright {
            text-align: center;
            margin-top: 2rem;
            padding-top: 2rem;
            border-top: 1px solid #333;
            font-size: 0.9rem;
            color: #aaa;
        }
        @media (max-width: 480px) {
            h1 { font-size: 2rem; }
            h2 { font-size: 1.75rem; }
            .content-section, aside { padding: 1.5rem; }
        }