* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background: #f8f9fa;
            max-width: 100vw;
            overflow-x: hidden;
        }
        img { max-width: 100%; height: auto; display: block; }
        .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        .text-center { text-align: center; }
        .bold { font-weight: 700; }
        .highlight { background-color: #fff3cd; padding: 2px 5px; border-radius: 3px; }
        .emoji { font-size: 1.2em; margin-right: 5px; }
        .site-header {
            background: linear-gradient(135deg, #0b3d7d 0%, #1c6bba 100%);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 900;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            text-decoration: none;
            color: white;
            font-family: 'Impact', 'Arial Black', sans-serif;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
        }
        .my-logo:hover { color: #ffd200; }
        .breadcrumb {
            padding: 10px 20px;
            background: #e9ecef;
            font-size: 0.9rem;
            color: #6c757d;
        }
        .breadcrumb a {
            color: #0b3d7d;
            text-decoration: none;
        }
        .breadcrumb a:hover { text-decoration: underline; }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 1.8rem;
        }
        .main-nav a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.05rem;
            padding: 5px 0;
            transition: color 0.3s;
            position: relative;
        }
        .main-nav a:hover { color: #ffd200; }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background: #ffd200;
            transition: width 0.3s;
        }
        .main-nav a:hover::after { width: 100%; }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 5px;
        }
        .search-box {
            margin: 30px auto;
            max-width: 700px;
            padding: 0 20px;
        }
        .search-form {
            display: flex;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            border-radius: 50px;
            overflow: hidden;
        }
        .search-input {
            flex-grow: 1;
            padding: 18px 25px;
            border: none;
            font-size: 1.1rem;
            outline: none;
        }
        .search-btn {
            background: #0b3d7d;
            color: white;
            border: none;
            padding: 0 35px;
            cursor: pointer;
            font-size: 1.1rem;
            transition: background 0.3s;
        }
        .search-btn:hover { background: #1c6bba; }
        .main-content {
            background: white;
            padding: 40px 30px;
            border-radius: 10px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
            margin: 30px auto;
        }
        .article-meta {
            color: #666;
            font-size: 0.95rem;
            margin-bottom: 30px;
            padding-bottom: 15px;
            border-bottom: 1px solid #eee;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 10px;
        }
        h1 {
            font-size: 2.8rem;
            color: #0b3d7d;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-left: 6px solid #ffd200;
            padding-left: 20px;
        }
        h2 {
            font-size: 2.1rem;
            color: #1c6bba;
            margin: 2.5rem 0 1.2rem;
            padding-bottom: 10px;
            border-bottom: 2px dashed #e9ecef;
        }
        h3 {
            font-size: 1.7rem;
            color: #333;
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.4rem;
            color: #555;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.3rem;
            color: #444;
            font-weight: 500;
            margin-bottom: 2rem;
            padding: 15px;
            background: #f8f9fa;
            border-left: 4px solid #0b3d7d;
        }
        .article-img {
            margin: 2.5rem auto;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
            max-width: 900px;
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: #666;
            padding: 10px;
            font-size: 0.95rem;
            background: #f8f9fa;
        }
        a {
            color: #0b3d7d;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover { color: #e63946; text-decoration: underline; }
        ul, ol { margin: 1rem 0 1.5rem 2rem; }
        li { margin-bottom: 0.7rem; }
        .tip-box {
            background: #e7f3ff;
            border-left: 5px solid #1c6bba;
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 8px 8px 0;
        }
        .warning-box {
            background: #fff3cd;
            border-left: 5px solid #ffc107;
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 8px 8px 0;
        }
        .user-feedback {
            background: #f8f9fa;
            padding: 30px;
            border-radius: 10px;
            margin-top: 50px;
            border: 1px solid #dee2e6;
        }
        .feedback-title {
            color: #0b3d7d;
            margin-bottom: 25px;
            text-align: center;
        }
        .form-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin-bottom: 25px;
        }
        .form-group { display: flex; flex-direction: column; }
        .form-group label { margin-bottom: 8px; font-weight: 600; color: #555; }
        .form-control {
            padding: 12px 15px;
            border: 1px solid #ced4da;
            border-radius: 6px;
            font-size: 1rem;
        }
        textarea.form-control { min-height: 120px; resize: vertical; }
        .star-rating {
            display: flex;
            gap: 10px;
            align-items: center;
            flex-wrap: wrap;
        }
        .star-rating input { display: none; }
        .star-rating label {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star-rating input:checked ~ label,
        .star-rating label:hover,
        .star-rating label:hover ~ label { color: #ffc107; }
        .submit-btn {
            background: #0b3d7d;
            color: white;
            border: none;
            padding: 15px 40px;
            font-size: 1.1rem;
            border-radius: 6px;
            cursor: pointer;
            transition: background 0.3s;
            display: block;
            margin: 20px auto 0;
        }
        .submit-btn:hover { background: #1c6bba; }
        .site-footer {
            background: #212529;
            color: #adb5bd;
            padding: 50px 0 30px;
            margin-top: 60px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-col h4 {
            color: #f8f9fa;
            margin-bottom: 20px;
            font-size: 1.3rem;
        }
        .footer-links { list-style: none; margin: 0; }
        .footer-links li { margin-bottom: 12px; }
        .footer-links a { color: #adb5bd; }
        .footer-links a:hover { color: #ffd200; }
        friend-link {
            display: block;
            margin: 15px 0;
            padding: 8px 15px;
            background: #343a40;
            border-radius: 4px;
        }
        friend-link a { color: #4dabf7; }
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid #495057;
            font-size: 0.95rem;
            color: #6c757d;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 1.9rem; }
            .main-nav ul { gap: 1.2rem; }
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .main-nav {
                position: fixed;
                top: 80px;
                left: -100%;
                width: 80%;
                height: calc(100vh - 80px);
                background: #0b3d7d;
                flex-direction: column;
                padding: 30px;
                transition: left 0.4s ease;
                box-shadow: 5px 0 15px rgba(0,0,0,0.2);
            }
            .main-nav.active { left: 0; }
            .main-nav ul {
                flex-direction: column;
                gap: 1.5rem;
            }
            .header-inner { flex-wrap: wrap; }
            .article-meta { flex-direction: column; }
        }
        @media (max-width: 576px) {
            h1 { font-size: 2rem; }
            h2 { font-size: 1.7rem; }
            .main-content { padding: 25px 20px; }
            .search-input, .search-btn { padding: 15px; }
            .form-grid { grid-template-columns: 1fr; }
        }