:root {
            --primary-dark: #0a2a4a;
            --primary-blue: #1a5a9a;
            --accent-gold: #d4af37;
            --accent-teal: #2a9d8f;
            --light-bg: #f8f9fa;
            --dark-text: #212529;
            --light-text: #e9ecef;
            --border-color: #dee2e6;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: var(--dark-text);
            background-color: var(--light-bg);
            max-width: 100vw;
            overflow-x: hidden;
        }
        a {
            color: var(--primary-blue);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent-teal);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-blue) 100%);
            color: var(--light-text);
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--accent-gold);
            text-transform: uppercase;
            letter-spacing: 2px;
            font-family: 'Trebuchet MS', sans-serif;
            text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
        }
        .my-logo:hover {
            color: white;
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: var(--light-text);
            font-weight: 600;
            padding: 0.5rem 0.75rem;
            border-radius: 4px;
        }
        .main-nav a:hover, .main-nav a.active {
            background-color: rgba(255,255,255,0.15);
            color: var(--accent-gold);
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: var(--light-text);
            cursor: pointer;
        }
        .breadcrumb {
            background-color: var(--light-bg);
            padding: 1rem 0;
            border-bottom: 1px solid var(--border-color);
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            gap: 0.5rem;
        }
        .breadcrumb li:not(:last-child)::after {
            content: "›";
            margin-left: 0.5rem;
            color: #888;
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            padding: 2.5rem 0;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background: white;
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: var(--shadow);
        }
        h1 {
            color: var(--primary-dark);
            font-size: 2.8rem;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 3px solid var(--accent-gold);
            padding-bottom: 0.5rem;
        }
        h2 {
            color: var(--primary-blue);
            font-size: 2rem;
            margin: 2.5rem 0 1.2rem;
            padding-top: 0.5rem;
        }
        h3 {
            color: var(--accent-teal);
            font-size: 1.5rem;
            margin: 2rem 0 1rem;
        }
        h4 {
            color: var(--primary-dark);
            font-size: 1.2rem;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.2rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.2rem;
            font-weight: 500;
            color: var(--primary-blue);
            background-color: #f1f8ff;
            padding: 1.2rem;
            border-left: 4px solid var(--accent-teal);
            border-radius: 0 8px 8px 0;
            margin-bottom: 2rem;
        }
        .highlight {
            background-color: #fff9e6;
            padding: 1.5rem;
            border-left: 5px solid var(--accent-gold);
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        em {
            color: #666;
            font-style: italic;
        }
        strong {
            color: var(--primary-dark);
            font-weight: 700;
        }
        ul, ol {
            margin-bottom: 1.2rem;
            padding-left: 2rem;
        }
        li {
            margin-bottom: 0.5rem;
        }
        .featured-image {
            width: 100%;
            margin: 2rem auto;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 6px 20px rgba(0,0,0,0.1);
        }
        .featured-image figcaption {
            text-align: center;
            font-style: italic;
            padding: 0.8rem;
            background-color: #f8f9fa;
            color: #666;
            font-size: 0.9rem;
        }
        .functional-box {
            background: linear-gradient(145deg, #f0f8ff, #e6f0ff);
            border: 1px solid #cce5ff;
            border-radius: 10px;
            padding: 2rem;
            margin: 2.5rem 0;
            box-shadow: var(--shadow);
        }
        .functional-box h3 {
            margin-top: 0;
            color: var(--primary-blue);
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }
        .functional-box h3 i {
            color: var(--accent-teal);
        }
        .form-group {
            margin-bottom: 1.2rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: var(--primary-dark);
        }
        .form-control {
            width: 100%;
            padding: 0.8rem 1rem;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            outline: none;
            border-color: var(--accent-teal);
            box-shadow: 0 0 0 3px rgba(42, 157, 143, 0.2);
        }
        .btn {
            background: linear-gradient(to right, var(--primary-blue), var(--accent-teal));
            color: white;
            border: none;
            padding: 0.9rem 1.8rem;
            font-size: 1rem;
            font-weight: 600;
            border-radius: 6px;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 0.6rem;
        }
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(0,0,0,0.15);
            background: linear-gradient(to right, var(--accent-teal), var(--primary-blue));
        }
        .rating {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .rating input {
            display: none;
        }
        .rating label {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .rating label:hover,
        .rating label:hover ~ label,
        .rating input:checked ~ label {
            color: var(--accent-gold);
        }
        .sidebar {
            background: white;
            padding: 2rem;
            border-radius: 12px;
            box-shadow: var(--shadow);
            align-self: start;
        }
        .sidebar h3 {
            margin-top: 0;
            color: var(--primary-dark);
            padding-bottom: 0.75rem;
            border-bottom: 2px solid var(--accent-gold);
            margin-bottom: 1.5rem;
        }
        .related-links {
            list-style: none;
            padding-left: 0;
        }
        .related-links li {
            margin-bottom: 1rem;
            padding-bottom: 1rem;
            border-bottom: 1px dashed var(--border-color);
        }
        .related-links a {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            color: var(--primary-dark);
            font-weight: 500;
        }
        .related-links a:hover {
            color: var(--accent-teal);
        }
        .related-links i {
            color: var(--primary-blue);
        }
        .update-time {
            background-color: #f8f9fa;
            padding: 1rem;
            border-radius: 8px;
            text-align: center;
            margin-top: 2rem;
            font-size: 0.9rem;
            color: #666;
        }
        .site-footer {
            background: var(--primary-dark);
            color: var(--light-text);
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-container {
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        friend-link {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 2rem;
            margin-bottom: 2rem;
            width: 100%;
        }
        friend-link a {
            color: var(--accent-gold);
            font-weight: 600;
            padding: 0.5rem 1rem;
            border: 1px solid rgba(212, 175, 55, 0.3);
            border-radius: 6px;
        }
        friend-link a:hover {
            background-color: rgba(212, 175, 55, 0.1);
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            width: 100%;
            font-size: 0.9rem;
            color: #aaa;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .main-nav ul {
                position: fixed;
                top: 80px;
                left: 0;
                width: 100%;
                background: var(--primary-dark);
                flex-direction: column;
                align-items: center;
                padding: 2rem 0;
                gap: 1rem;
                clip-path: polygon(0 0, 100% 0, 100% 0, 0 0);
                transition: clip-path 0.4s ease;
                z-index: 999;
                box-shadow: 0 10px 20px rgba(0,0,0,0.2);
            }
            .main-nav ul.active {
                clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
            }
            .article-content {
                padding: 1.5rem;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
            .functional-box {
                padding: 1.5rem;
            }
        }
        .text-center {
            text-align: center;
        }
        .mb-3 {
            margin-bottom: 1.5rem;
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 0.3em;
        }