*,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary: #1a3e60;
            --primary-light: #2d5a82;
            --accent: #e67e22;
            --accent-hover: #cf6d1a;
            --bg: #f5f7fa;
            --card-bg: #ffffff;
            --text: #2c3e50;
            --text-light: #5d7a94;
            --border: #e2e8f0;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.75;
        }
        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: var(--accent);
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
            color: #fff;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.2);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding: 15px 20px;
            max-width: 1200px;
            margin: 0 auto;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -1px;
            text-transform: lowercase;
            position: relative;
        }
        .my-logo::after {
            content: '™';
            font-size: 0.9rem;
            vertical-align: super;
            color: var(--accent);
            margin-left: 2px;
        }
        .my-logo:hover {
            color: #fff;
            opacity: 0.9;
        }
        .nav-menu {
            display: flex;
            list-style: none;
            gap: 25px;
        }
        .nav-menu li a {
            color: rgba(255, 255, 255, 0.9);
            font-weight: 500;
            font-size: 0.95rem;
            padding: 5px 0;
            border-bottom: 2px solid transparent;
            transition: all 0.3s;
        }
        .nav-menu li a:hover {
            color: var(--accent);
            border-bottom-color: var(--accent);
        }
        .hamburger {
            display: none;
            background: transparent;
            border: none;
            font-size: 1.5rem;
            color: #fff;
            cursor: pointer;
            padding: 5px;
        }
        .breadcrumb-wrap {
            background: rgba(255, 255, 255, 0.08);
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 8px 0;
        }
        .breadcrumb {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.8);
        }
        .breadcrumb a {
            color: rgba(255, 255, 255, 0.8);
        }
        .breadcrumb a:hover {
            color: var(--accent);
        }
        .breadcrumb .sep {
            margin: 0 6px;
            opacity: 0.6;
        }
        .breadcrumb .current {
            color: var(--accent);
        }
        .hero-section {
            background: linear-gradient(135deg, #0f2a44 0%, #1a3e60 50%, #2d5a82 100%);
            color: #fff;
            padding: 70px 20px;
            text-align: center;
        }
        .hero-section .container {
            max-width: 900px;
        }
        .hero-section h1 {
            font-size: 3rem;
            font-weight: 800;
            margin-bottom: 10px;
            letter-spacing: -1px;
            line-height: 1.2;
        }
        .hero-section .hero-sub {
            font-size: 1.2rem;
            opacity: 0.9;
            margin-bottom: 20px;
        }
        .hero-section .hero-tagline {
            font-size: 1rem;
            opacity: 0.75;
            max-width: 600px;
            margin: 0 auto;
        }
        .search-section {
            background: var(--card-bg);
            padding: 25px 0;
            border-bottom: 1px solid var(--border);
        }
        .search-form {
            display: flex;
            gap: 10px;
            max-width: 600px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .search-form input[type="text"] {
            flex: 1;
            padding: 14px 20px;
            border: 2px solid var(--border);
            border-radius: 30px;
            font-size: 1rem;
            outline: none;
            transition: border-color 0.3s;
        }
        .search-form input[type="text"]:focus {
            border-color: var(--primary-light);
        }
        .search-form button {
            background: var(--accent);
            color: #fff;
            border: none;
            border-radius: 30px;
            padding: 14px 25px;
            font-size: 1rem;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 8px;
            transition: background 0.3s;
        }
        .search-form button:hover {
            background: var(--accent-hover);
        }
        .main-content {
            padding: 30px 0 60px;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 40px;
        }
        .article-body {
            background: var(--card-bg);
            border-radius: 12px;
            padding: 40px;
            box-shadow: var(--shadow);
            line-height: 1.8;
        }
        .article-body p {
            margin-bottom: 18px;
        }
        .article-body h2 {
            font-size: 1.8rem;
            color: var(--primary);
            margin: 40px 0 15px;
            padding-bottom: 8px;
            border-bottom: 3px solid var(--accent);
            display: inline-block;
        }
        .article-body h3 {
            font-size: 1.3rem;
            color: var(--primary-light);
            margin: 30px 0 10px;
        }
        .article-body h4 {
            font-size: 1.1rem;
            color: var(--text);
            margin: 20px 0 10px;
            font-weight: 600;
        }
        .article-body ul,
        .article-body ol {
            margin: 0 0 20px 20px;
        }
        .article-body li {
            margin-bottom: 8px;
        }
        .article-body img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
            margin: 20px 0;
            box-shadow: var(--shadow);
        }
        .highlight-box {
            background: #eef4fb;
            border-left: 4px solid var(--primary);
            padding: 15px 20px;
            border-radius: 0 8px 8px 0;
            margin: 20px 0;
        }
        .tip-box {
            background: #fdf3e7;
            border-left: 4px solid var(--accent);
            padding: 15px 20px;
            border-radius: 0 8px 8px 0;
            margin: 20px 0;
        }
        .stat-box {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            margin: 25px 0;
        }
        .stat-item {
            background: #f8fafc;
            border-radius: 8px;
            padding: 20px;
            text-align: center;
            flex: 1;
            min-width: 120px;
            border: 1px solid var(--border);
        }
        .stat-item .num {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary);
        }
        .stat-item .label {
            font-size: 0.85rem;
            color: var(--text-light);
            margin-top: 5px;
        }
        .sidebar {
            background: var(--card-bg);
            border-radius: 12px;
            padding: 25px;
            box-shadow: var(--shadow);
            height: fit-content;
            position: sticky;
            top: 90px;
        }
        .sidebar h3 {
            font-size: 1.1rem;
            margin-bottom: 15px;
            color: var(--primary);
            padding-bottom: 8px;
            border-bottom: 2px solid var(--border);
        }
        .sidebar ul {
            list-style: none;
        }
        .sidebar ul li {
            margin-bottom: 10px;
        }
        .sidebar ul li a {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            padding: 6px 0;
            color: var(--text);
        }
        .sidebar ul li a:hover {
            color: var(--accent);
        }
        .sidebar ul li a i {
            color: var(--accent);
            width: 18px;
            text-align: center;
        }
        .interaction-section {
            background: var(--card-bg);
            border-radius: 12px;
            padding: 35px;
            box-shadow: var(--shadow);
            margin-top: 40px;
        }
        .interaction-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
        }
        .interaction-section h3 {
            font-size: 1.3rem;
            margin-bottom: 15px;
            color: var(--primary);
        }
        .comment-form textarea {
            width: 100%;
            padding: 12px;
            border: 2px solid var(--border);
            border-radius: 8px;
            resize: vertical;
            min-height: 100px;
            font-family: inherit;
            font-size: 0.95rem;
            outline: none;
        }
        .comment-form textarea:focus {
            border-color: var(--primary-light);
        }
        .rating-form select {
            width: 100%;
            padding: 12px;
            border: 2px solid var(--border);
            border-radius: 8px;
            font-family: inherit;
            font-size: 0.95rem;
            background: #fff;
            outline: none;
        }
        .btn-submit {
            background: var(--primary);
            color: #fff;
            border: none;
            padding: 12px 25px;
            border-radius: 30px;
            font-size: 0.95rem;
            cursor: pointer;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: background 0.3s;
            margin-top: 10px;
        }
        .btn-submit:hover {
            background: var(--primary-light);
        }
        .stars-display {
            font-size: 1.5rem;
            color: var(--accent);
            letter-spacing: 4px;
        }
        .site-footer {
            background: #0e2440;
            color: rgba(255, 255, 255, 0.8);
            padding: 50px 0 20px;
            margin-top: 40px;
        }
        .footer-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 40px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 1.1rem;
            margin-bottom: 15px;
        }
        .footer-col ul {
            list-style: none;
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.7);
        }
        .footer-col ul li a:hover {
            color: var(--accent);
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            margin-top: 30px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 20px;
            padding-right: 20px;
        }
        friend-link {
            display: block;
            padding: 25px 0;
            background: rgba(255, 255, 255, 0.04);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            margin-top: 20px;
        }
        friend-link .friend-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            font-size: 0.9rem;
        }
        friend-link a {
            color: var(--accent);
            margin: 0 12px 0 4px;
            display: inline-block;
        }
        friend-link a:hover {
            text-decoration: underline;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: var(--primary);
            color: #fff;
            width: 45px;
            height: 45px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
            cursor: pointer;
            z-index: 999;
        }
        .back-to-top.show {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--accent);
        }
        @media (max-width: 992px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
                margin-top: 30px;
            }
            .interaction-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .footer-inner {
                grid-template-columns: 1fr;
                gap: 30px;
            }
        }
        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                flex-direction: column;
                width: 100%;
                padding: 15px 0;
                gap: 10px;
                border-top: 1px solid rgba(255, 255, 255, 0.1);
                margin-top: 10px;
            }
            .nav-menu.active {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            .header-inner {
                flex-wrap: wrap;
            }
            .hero-section h1 {
                font-size: 2rem;
            }
            .hero-section .hero-sub {
                font-size: 1rem;
            }
            .article-body {
                padding: 25px;
            }
            .search-form {
                flex-direction: column;
            }
            .search-form button {
                justify-content: center;
            }
            .stat-box {
                flex-direction: column;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 15px;
            }
            .article-body {
                padding: 20px;
            }
            .article-body h2 {
                font-size: 1.4rem;
            }
            .article-body h3 {
                font-size: 1.1rem;
            }
        }