:root {
            --primary-color: #1a73e8;
            --secondary-color: #34a853;
            --accent-color: #fbbc04;
            --dark-bg: #202124;
            --light-bg: #f8f9fa;
            --text-primary: #202124;
            --text-secondary: #5f6368;
            --border-color: #dadce0;
            --header-height: 70px;
            --font-main: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            --max-width: 1200px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: var(--font-main);
            line-height: 1.6;
            color: var(--text-primary);
            background-color: #fff;
            overflow-x: hidden;
        }
        header {
            background-color: #fff;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
            border-bottom: 3px solid var(--primary-color);
        }
        .header-container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: var(--header-height);
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary-color);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo span {
            color: var(--accent-color);
        }
        .my-logo:hover {
            color: #0d62c9;
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 25px;
        }
        .main-nav a {
            text-decoration: none;
            color: var(--text-primary);
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 4px;
            transition: all 0.3s ease;
        }
        .main-nav a:hover {
            background-color: var(--light-bg);
            color: var(--primary-color);
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text-primary);
            cursor: pointer;
            padding: 5px;
        }
        .search-form {
            display: flex;
            max-width: 400px;
            margin: 30px auto;
            border: 2px solid var(--border-color);
            border-radius: 30px;
            overflow: hidden;
        }
        .search-input {
            flex-grow: 1;
            padding: 12px 20px;
            border: none;
            outline: none;
            font-size: 1rem;
        }
        .search-btn {
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 0 25px;
            cursor: pointer;
            transition: background-color 0.3s;
        }
        .search-btn:hover {
            background-color: #0d62c9;
        }
        main {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 20px;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        article {
            grid-column: 1;
        }
        aside {
            grid-column: 2;
        }
        section {
            margin-bottom: 40px;
            padding-bottom: 20px;
            border-bottom: 1px solid var(--border-color);
        }
        h1 {
            font-size: 2.5rem;
            margin-bottom: 20px;
            color: var(--text-primary);
            line-height: 1.2;
        }
        h2 {
            font-size: 1.8rem;
            margin: 30px 0 15px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--primary-color);
            color: var(--text-primary);
        }
        h3 {
            font-size: 1.4rem;
            margin: 20px 0 10px;
            color: var(--text-secondary);
        }
        h4 {
            font-size: 1.1rem;
            margin: 15px 0 8px;
            color: var(--text-secondary);
        }
        p {
            margin-bottom: 15px;
            color: var(--text-primary);
        }
        .lead {
            font-size: 1.2rem;
            color: var(--text-secondary);
            margin-bottom: 30px;
            padding: 15px;
            background-color: var(--light-bg);
            border-left: 4px solid var(--primary-color);
        }
        .article-image {
            width: 100%;
            height: auto;
            border-radius: 8px;
            margin: 20px 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            transition: transform 0.3s ease;
        }
        .article-image:hover {
            transform: scale(1.01);
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: var(--text-secondary);
            margin-top: -15px;
            margin-bottom: 20px;
            font-size: 0.9rem;
        }
        a {
            color: var(--primary-color);
            text-decoration: none;
        }
        a:hover {
            text-decoration: underline;
        }
        .internal-link {
            background-color: #e8f0fe;
            padding: 2px 6px;
            border-radius: 3px;
        }
        ul, ol {
            margin-left: 25px;
            margin-bottom: 20px;
        }
        li {
            margin-bottom: 8px;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            box-shadow: 0 2px 5px rgba(0,0,0,0.05);
        }
        th, td {
            border: 1px solid var(--border-color);
            padding: 12px 15px;
            text-align: left;
        }
        th {
            background-color: var(--light-bg);
            font-weight: 600;
        }
        tr:nth-child(even) {
            background-color: #f9f9f9;
        }
        aside {
            background-color: var(--light-bg);
            padding: 25px;
            border-radius: 10px;
            align-self: start;
            position: sticky;
            top: calc(var(--header-height) + 20px);
        }
        .info-box {
            margin-bottom: 30px;
        }
        .info-box h3 {
            background-color: var(--primary-color);
            color: white;
            padding: 12px 15px;
            margin: -25px -25px 20px -25px;
            border-radius: 10px 10px 0 0;
        }
        .info-box ul {
            list-style: none;
            margin-left: 0;
        }
        .info-box li {
            padding: 8px 0;
            border-bottom: 1px dashed var(--border-color);
        }
        .info-box li:last-child {
            border-bottom: none;
        }
        .btn {
            display: inline-block;
            background-color: var(--primary-color);
            color: white;
            padding: 12px 24px;
            border-radius: 5px;
            font-weight: 600;
            cursor: pointer;
            border: none;
            transition: all 0.3s ease;
            text-align: center;
            min-height: 44px;
            min-width: 44px;
        }
        .btn:hover {
            background-color: #0d62c9;
            text-decoration: none;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .btn-secondary {
            background-color: var(--secondary-color);
        }
        .btn-secondary:hover {
            background-color: #2e8b57;
        }
        form {
            background-color: white;
            padding: 25px;
            border-radius: 10px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.05);
            margin-bottom: 30px;
        }
        .form-group {
            margin-bottom: 20px;
        }
        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
        }
        input, textarea, select {
            width: 100%;
            padding: 12px;
            border: 1px solid var(--border-color);
            border-radius: 5px;
            font-family: var(--font-main);
            font-size: 1rem;
        }
        textarea {
            min-height: 150px;
            resize: vertical;
        }
        .rating-stars {
            display: flex;
            gap: 5px;
            margin: 10px 0;
        }
        .star {
            font-size: 1.5rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star:hover,
        .star.active {
            color: var(--accent-color);
        }
        .social-share {
            display: flex;
            gap: 15px;
            margin: 30px 0;
        }
        .social-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            background-color: var(--light-bg);
            border-radius: 50%;
            color: var(--text-primary);
            font-size: 1.2rem;
            transition: all 0.3s ease;
        }
        .social-icon:hover {
            transform: translateY(-3px);
            text-decoration: none;
        }
        .facebook:hover { background-color: #3b5998; color: white; }
        .twitter:hover { background-color: #1da1f2; color: white; }
        .reddit:hover { background-color: #ff4500; color: white; }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            text-decoration: none;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            z-index: 999;
        }
        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: #0d62c9;
            text-decoration: none;
        }
        footer {
            background-color: var(--dark-bg);
            color: #e8eaed;
            padding: 40px 20px;
            margin-top: 60px;
        }
        .footer-container {
            max-width: var(--max-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
        }
        .footer-section h3 {
            color: white;
            margin-bottom: 20px;
            font-size: 1.2rem;
        }
        .footer-links {
            list-style: none;
            margin-left: 0;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a {
            color: #bdc1c6;
            text-decoration: none;
        }
        .footer-links a:hover {
            color: white;
            text-decoration: underline;
        }
        friend-link {
            display: block;
            margin: 5px 0;
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            margin-top: 30px;
            border-top: 1px solid #3c4043;
            color: #9aa0a6;
            font-size: 0.9rem;
        }
        @media (max-width: 1024px) {
            main {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            aside {
                grid-column: 1;
                position: static;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                padding: 0 15px;
            }
            .main-nav {
                position: fixed;
                top: var(--header-height);
                left: 0;
                width: 100%;
                background-color: white;
                box-shadow: 0 5px 10px rgba(0,0,0,0.1);
                padding: 20px;
                transform: translateY(-100%);
                opacity: 0;
                visibility: hidden;
                transition: all 0.3s ease;
            }
            .main-nav.active {
                transform: translateY(0);
                opacity: 1;
                visibility: visible;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 0;
            }
            .main-nav a {
                display: block;
                padding: 15px;
                border-bottom: 1px solid var(--border-color);
            }
            .main-nav a:last-child {
                border-bottom: none;
            }
            .nav-toggle {
                display: block;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.6rem;
            }
            h3 {
                font-size: 1.3rem;
            }
            .lead {
                font-size: 1.1rem;
            }
            .social-share {
                justify-content: center;
                flex-wrap: wrap;
            }
            .back-to-top {
                bottom: 20px;
                right: 20px;
                width: 44px;
                height: 44px;
            }
        }
        @media (max-width: 480px) {
            html {
                font-size: 14px;
            }
            .header-container {
                height: 60px;
            }
            .my-logo {
                font-size: 1.5rem;
            }
            .search-form {
                flex-direction: column;
                border-radius: 10px;
                overflow: hidden;
            }
            .search-input, .search-btn {
                width: 100%;
                border-radius: 0;
            }
            form {
                padding: 15px;
            }
        }
        .text-center { text-align: center; }
        .text-bold { font-weight: 700; }
        .text-muted { color: var(--text-secondary); }
        .mb-20 { margin-bottom: 20px; }
        .mt-30 { margin-top: 30px; }
        .p-20 { padding: 20px; }
        .bg-light { background-color: var(--light-bg); }
        .border { border: 1px solid var(--border-color); }
        .border-radius { border-radius: 8px; }
        .d-flex { display: flex; }
        .align-center { align-items: center; }
        .justify-between { justify-content: space-between; }
        .flex-wrap { flex-wrap: wrap; }
        .gap-15 { gap: 15px; }
        .highlight {
            background-color: #fff3cd;
            padding: 10px 15px;
            border-left: 4px solid var(--accent-color);
            margin: 20px 0;
        }
        .update-card {
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            padding: 20px;
            border-radius: 10px;
            margin: 20px 0;
            border-left: 5px solid var(--primary-color);
        }
        .update-date {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-bottom: 10px;
        }
        .faq-item {
            margin-bottom: 20px;
            border-bottom: 1px solid var(--border-color);
            padding-bottom: 20px;
        }
        .faq-question {
            font-weight: 600;
            color: var(--primary-color);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }
        .faq-answer.active {
            max-height: 500px;
            margin-top: 15px;
        }
        .tip-card {
            background-color: white;
            border: 2px solid var(--secondary-color);
            border-radius: 10px;
            padding: 20px;
            margin: 20px 0;
            position: relative;
        }
        .tip-card::before {
            content: "💡";
            position: absolute;
            top: -15px;
            left: 20px;
            background-color: white;
            padding: 5px 10px;
            border-radius: 20px;
            font-size: 1.2rem;
        }