* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary: #1a73e8;
            --secondary: #ff6b35;
            --dark: #2d3748;
            --light: #f7fafc;
            --gray: #718096;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            line-height: 1.7;
            color: var(--dark);
            background-color: #fff;
            overflow-x: hidden;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 900;
            color: var(--primary);
            text-transform: uppercase;
            letter-spacing: -1px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .my-logo:hover {
            opacity: 0.9;
        }
        .main-nav {
            display: flex;
            align-items: center;
        }
        .nav-list {
            display: flex;
            list-style: none;
        }
        .nav-list li {
            margin-left: 30px;
        }
        .nav-list a {
            font-weight: 600;
            color: var(--dark);
            padding: 8px 0;
            border-bottom: 2px solid transparent;
        }
        .nav-list a:hover, .nav-list a.active {
            color: var(--primary);
            border-bottom-color: var(--primary);
        }
        .hamburger {
            display: none;
            flex-direction: column;
            cursor: pointer;
            background: none;
            border: none;
            padding: 5px;
        }
        .hamburger span {
            width: 25px;
            height: 3px;
            background: var(--dark);
            margin: 3px 0;
            transition: var(--transition);
            border-radius: 2px;
        }
        .breadcrumb {
            background: var(--light);
            padding: 15px 0;
            font-size: 0.9rem;
            margin-bottom: 30px;
        }
        .breadcrumb .container {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--gray);
        }
        .breadcrumb i {
            margin: 0 10px;
            color: #cbd5e0;
        }
        .search-container {
            background: linear-gradient(135deg, #1a73e8 0%, #6c8ef5 100%);
            padding: 40px 0;
            text-align: center;
            color: white;
            margin-bottom: 40px;
        }
        .search-box {
            max-width: 600px;
            margin: 20px auto 0;
            display: flex;
            border-radius: 50px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .search-box input {
            flex: 1;
            padding: 18px 25px;
            border: none;
            font-size: 1rem;
            outline: none;
        }
        .search-box button {
            background: var(--secondary);
            color: white;
            border: none;
            padding: 0 30px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            transition: var(--transition);
        }
        .search-box button:hover {
            background: #e55a2b;
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            margin: 40px 0;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }
        article {
            background: white;
            border-radius: 12px;
            padding: 30px;
            box-shadow: var(--shadow);
        }
        h1, h2, h3, h4 {
            color: var(--dark);
            line-height: 1.3;
            margin-top: 1.5em;
            margin-bottom: 0.7em;
            font-weight: 800;
        }
        h1 {
            font-size: 2.8rem;
            border-bottom: 3px solid var(--secondary);
            padding-bottom: 15px;
            margin-top: 0;
        }
        h2 {
            font-size: 2rem;
            color: var(--primary);
        }
        h3 {
            font-size: 1.6rem;
        }
        h4 {
            font-size: 1.3rem;
            color: var(--secondary);
        }
        p {
            margin-bottom: 1.5em;
            font-size: 1.1rem;
            color: #4a5568;
        }
        .intro {
            font-size: 1.3rem;
            color: var(--dark);
            font-weight: 500;
            background: #f0f9ff;
            padding: 25px;
            border-left: 5px solid var(--primary);
            border-radius: 0 8px 8px 0;
            margin-bottom: 2.5em;
        }
        .highlight {
            background: linear-gradient(120deg, #fffbcc 0%, #fffbcc 100%);
            padding: 3px 6px;
            border-radius: 4px;
            font-weight: 600;
        }
        .code-block {
            background: #2d3748;
            color: #e2e8f0;
            padding: 25px;
            border-radius: 10px;
            font-family: 'Courier New', monospace;
            margin: 25px 0;
            overflow-x: auto;
            box-shadow: inset 0 0 10px rgba(0,0,0,0.5);
        }
        .code-block .code {
            color: #68d391;
            font-weight: bold;
            font-size: 1.2rem;
        }
        .note {
            background: #e6fffa;
            border-left: 5px solid #38b2ac;
            padding: 20px;
            border-radius: 0 8px 8px 0;
            margin: 25px 0;
        }
        .note strong {
            color: #285e61;
        }
        .responsive-table {
            overflow-x: auto;
            margin: 30px 0;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            min-width: 600px;
        }
        th, td {
            padding: 18px 15px;
            text-align: left;
            border-bottom: 1px solid #e2e8f0;
        }
        th {
            background: var(--primary);
            color: white;
            font-weight: 700;
        }
        tr:nth-child(even) {
            background: #f8fafc;
        }
        tr:hover {
            background: #edf2f7;
        }
        .sidebar {
            background: white;
            border-radius: 12px;
            padding: 25px;
            box-shadow: var(--shadow);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        .sidebar h3 {
            font-size: 1.4rem;
            padding-bottom: 10px;
            border-bottom: 2px solid #e2e8f0;
            margin-top: 0;
        }
        .sidebar ul {
            list-style: none;
        }
        .sidebar li {
            margin-bottom: 15px;
            padding-bottom: 15px;
            border-bottom: 1px dashed #e2e8f0;
        }
        .sidebar li:last-child {
            border-bottom: none;
        }
        .sidebar a {
            display: flex;
            align-items: center;
            color: var(--dark);
            font-weight: 500;
        }
        .sidebar i {
            color: var(--primary);
            margin-right: 12px;
            width: 20px;
            text-align: center;
        }
        .update-time {
            background: #fff8e1;
            padding: 15px;
            border-radius: 8px;
            margin-top: 25px;
            font-size: 0.9rem;
            color: #5d4037;
        }
        .user-interaction {
            background: white;
            border-radius: 12px;
            padding: 30px;
            box-shadow: var(--shadow);
            margin-top: 40px;
        }
        .interaction-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
        }
        @media (max-width: 768px) {
            .interaction-grid {
                grid-template-columns: 1fr;
            }
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--dark);
        }
        .form-control {
            width: 100%;
            padding: 14px;
            border: 1px solid #cbd5e0;
            border-radius: 8px;
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            border-color: var(--primary);
            outline: none;
            box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.2);
        }
        textarea.form-control {
            min-height: 150px;
            resize: vertical;
        }
        .rating-stars {
            display: flex;
            gap: 10px;
            font-size: 2rem;
            color: #e2e8f0;
            margin: 10px 0;
        }
        .rating-stars .star {
            cursor: pointer;
            transition: var(--transition);
        }
        .rating-stars .star:hover,
        .rating-stars .star.active {
            color: #fbbf24;
        }
        .btn {
            display: inline-block;
            background: var(--primary);
            color: white;
            padding: 16px 32px;
            border: none;
            border-radius: 8px;
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
        }
        .btn:hover {
            background: #1669c1;
            transform: translateY(-3px);
            box-shadow: 0 7px 14px rgba(0,0,0,0.1);
        }
        .btn-secondary {
            background: var(--secondary);
        }
        .btn-secondary:hover {
            background: #e55a2b;
        }
        .site-footer {
            background: var(--dark);
            color: #cbd5e0;
            padding: 50px 0 20px;
            margin-top: 60px;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
        }
        @media (max-width: 992px) {
            .footer-container {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 576px) {
            .footer-container {
                grid-template-columns: 1fr;
            }
        }
        .footer-col h4 {
            color: white;
            font-size: 1.3rem;
            margin-bottom: 25px;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 15px;
        }
        .footer-links a {
            color: #a0aec0;
            display: flex;
            align-items: center;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .footer-links i {
            margin-right: 10px;
            width: 20px;
        }
        friend-link {
            display: block;
            background: rgba(255,255,255,0.05);
            padding: 15px;
            border-radius: 8px;
            margin-bottom: 15px;
            border-left: 3px solid var(--primary);
        }
        friend-link a {
            color: white;
            font-weight: 600;
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            margin-top: 30px;
            border-top: 1px solid #4a5568;
            font-size: 0.9rem;
            color: #a0aec0;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: flex;
            }
            .main-nav {
                position: fixed;
                top: 80px;
                left: 0;
                width: 100%;
                background: white;
                box-shadow: var(--shadow);
                flex-direction: column;
                align-items: stretch;
                padding: 0;
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.5s ease;
            }
            .main-nav.active {
                max-height: 400px;
                padding: 20px 0;
            }
            .nav-list {
                flex-direction: column;
                align-items: center;
            }
            .nav-list li {
                margin: 10px 0;
            }
            .hamburger.active span:nth-child(1) {
                transform: rotate(45deg) translate(5px, 5px);
            }
            .hamburger.active span:nth-child(2) {
                opacity: 0;
            }
            .hamburger.active span:nth-child(3) {
                transform: rotate(-45deg) translate(7px, -6px);
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
        }