*,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            line-height: 1.7;
            background: #f8f9fa;
            color: #1e2a3a;
            padding-top: 0;
        }
        a {
            color: #0d6efd;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: #0a58ca;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        ul,
        ol {
            padding-left: 1.5rem;
            margin-bottom: 1rem;
        }
        li {
            margin-bottom: 0.4rem;
        }
        .container {
            max-width: 1140px;
            margin: 0 auto;
            padding: 0 1.25rem;
        }
        .site-header {
            background: linear-gradient(135deg, #0b1a2e, #1c3a5a);
            padding: 0.75rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.25);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 1.7rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.5px;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .my-logo i {
            color: #ffc107;
            font-size: 1.9rem;
        }
        .my-logo:hover {
            color: #ffc107;
            text-decoration: none;
        }
        .my-logo span {
            font-weight: 300;
            color: #b0cfe0;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 1.8rem;
        }
        .main-nav a {
            color: #e8f0fe;
            font-size: 0.95rem;
            font-weight: 500;
            padding: 0.3rem 0;
            position: relative;
            transition: color 0.2s;
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: #ffc107;
            transition: width 0.3s;
        }
        .main-nav a:hover::after,
        .main-nav a:focus::after {
            width: 100%;
        }
        .main-nav a:hover {
            color: #ffc107;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.2rem;
            transition: transform 0.2s;
        }
        .hamburger:hover {
            transform: scale(1.1);
        }
        .nav-open .main-nav {
            display: flex;
            flex-direction: column;
            background: #0b1a2e;
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            padding: 1.5rem 2rem;
            gap: 1rem;
            border-top: 1px solid #2a4a6a;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
            z-index: 999;
        }
        .nav-open .main-nav a {
            font-size: 1.1rem;
        }
        .breadcrumb {
            background: #e9ecef;
            padding: 0.6rem 0;
            font-size: 0.9rem;
            border-bottom: 1px solid #dde3e9;
        }
        .breadcrumb ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 0.4rem 0.8rem;
            margin: 0;
            padding: 0;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 0.6rem;
            color: #6c757d;
            font-weight: 700;
        }
        .breadcrumb a {
            color: #0d6efd;
        }
        .breadcrumb .current {
            color: #495057;
            font-weight: 600;
        }
        .hero {
            background: linear-gradient(145deg, #e9f0f7, #d4e0ed);
            padding: 3rem 0 2.5rem;
            border-bottom: 3px solid #ffc107;
        }
        .hero h1 {
            font-size: 2.6rem;
            font-weight: 800;
            color: #0b1a2e;
            line-height: 1.25;
            margin-bottom: 0.75rem;
        }
        .hero h1 i {
            color: #ffc107;
            margin-right: 0.5rem;
        }
        .hero p {
            font-size: 1.15rem;
            color: #2c3e50;
            max-width: 800px;
            margin-bottom: 0.3rem;
        }
        .hero .meta {
            font-size: 0.95rem;
            color: #5a6b7c;
            margin-top: 0.8rem;
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
        }
        .hero .meta i {
            margin-right: 0.3rem;
            color: #0d6efd;
        }
        .content-area {
            padding: 2.5rem 0 3rem;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
        }
        .article-body h2 {
            font-size: 2rem;
            font-weight: 700;
            color: #0b1a2e;
            margin: 2.5rem 0 1rem 0;
            padding-bottom: 0.5rem;
            border-bottom: 3px solid #ffc107;
        }
        .article-body h3 {
            font-size: 1.5rem;
            font-weight: 600;
            color: #1c3a5a;
            margin: 2rem 0 0.8rem 0;
        }
        .article-body h4 {
            font-size: 1.2rem;
            font-weight: 600;
            color: #2c4a6a;
            margin: 1.5rem 0 0.5rem 0;
        }
        .article-body p {
            margin-bottom: 1.2rem;
            font-size: 1.05rem;
            color: #1e2a3a;
        }
        .article-body strong {
            color: #0b1a2e;
        }
        .article-body .highlight-box {
            background: #f0f4fa;
            border-left: 5px solid #ffc107;
            padding: 1.2rem 1.8rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .article-body .highlight-box i {
            color: #ffc107;
            margin-right: 0.5rem;
        }
        .article-body ul,
        .article-body ol {
            margin-bottom: 1.5rem;
        }
        .article-body li {
            font-size: 1.05rem;
        }
        .content-figure {
            margin: 2rem 0;
            background: #fff;
            border-radius: 12px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            padding: 0.8rem;
            text-align: center;
        }
        .content-figure img {
            border-radius: 8px;
            width: 100%;
            max-width: 720px;
            margin: 0 auto;
        }
        .content-figure figcaption {
            font-size: 0.9rem;
            color: #6c757d;
            margin-top: 0.5rem;
            font-style: italic;
        }
        .sidebar {
            position: sticky;
            top: 100px;
            align-self: start;
        }
        .sidebar-card {
            background: #fff;
            border-radius: 12px;
            padding: 1.5rem;
            margin-bottom: 1.5rem;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
        }
        .sidebar-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 1rem;
            color: #0b1a2e;
            border-bottom: 2px solid #ffc107;
            padding-bottom: 0.4rem;
        }
        .sidebar-card ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .sidebar-card li {
            margin-bottom: 0.6rem;
        }
        .sidebar-card li a {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 0.95rem;
        }
        .sidebar-card li a i {
            color: #ffc107;
            width: 1.2rem;
        }
        .search-form {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .search-form input {
            flex: 1;
            padding: 0.6rem 1rem;
            border: 2px solid #dde3e9;
            border-radius: 50px;
            font-size: 0.95rem;
            outline: none;
            transition: border-color 0.3s;
        }
        .search-form input:focus {
            border-color: #ffc107;
        }
        .search-form button {
            padding: 0.6rem 1.4rem;
            background: #0b1a2e;
            color: #fff;
            border: none;
            border-radius: 50px;
            cursor: pointer;
            font-size: 0.95rem;
            font-weight: 600;
            transition: background 0.3s;
        }
        .search-form button:hover {
            background: #1c3a5a;
        }
        .feedback-section {
            margin-top: 3rem;
            padding-top: 2rem;
            border-top: 2px solid #e9ecef;
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
        }
        .feedback-card {
            background: #fff;
            border-radius: 12px;
            padding: 1.8rem;
            box-shadow: 0 2px 16px rgba(0, 0, 0, 0.05);
        }
        .feedback-card h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 1rem;
            color: #0b1a2e;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .feedback-card h3 i {
            color: #ffc107;
        }
        .feedback-card form {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
        }
        .feedback-card input,
        .feedback-card textarea,
        .feedback-card select {
            padding: 0.7rem 1rem;
            border: 2px solid #dde3e9;
            border-radius: 8px;
            font-size: 0.95rem;
            outline: none;
            transition: border-color 0.3s;
            font-family: inherit;
        }
        .feedback-card input:focus,
        .feedback-card textarea:focus,
        .feedback-card select:focus {
            border-color: #ffc107;
        }
        .feedback-card textarea {
            min-height: 100px;
            resize: vertical;
        }
        .feedback-card .btn-submit {
            padding: 0.7rem 1.5rem;
            background: #0b1a2e;
            color: #fff;
            border: none;
            border-radius: 50px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            transition: background 0.3s, transform 0.2s;
            align-self: flex-start;
        }
        .feedback-card .btn-submit:hover {
            background: #1c3a5a;
            transform: translateY(-1px);
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 0.2rem;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 1.6rem;
            color: #dde3e9;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #ffc107;
        }
        .site-footer {
            background: #0b1a2e;
            color: #c8d6e5;
            padding: 2.5rem 0 1.5rem;
            margin-top: 2rem;
        }
        .footer-inner {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2rem;
        }
        .footer-inner h4 {
            color: #ffc107;
            font-size: 1.1rem;
            margin-bottom: 0.8rem;
        }
        .footer-inner a {
            color: #b0cfe0;
        }
        .footer-inner a:hover {
            color: #ffc107;
        }
        .footer-inner ul {
            list-style: none;
            padding: 0;
        }
        .footer-inner li {
            margin-bottom: 0.4rem;
        }
        friend-link {
            display: block;
            margin: 1rem 0 0.5rem;
            font-size: 0.95rem;
        }
        friend-link a {
            display: inline-block;
            margin-right: 1rem;
            padding: 0.2rem 0;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            margin-top: 1.5rem;
            border-top: 1px solid #2a4a6a;
            font-size: 0.9rem;
            color: #8a9db0;
        }
        @media (max-width: 992px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
            }
            .footer-inner {
                grid-template-columns: 1fr 1fr;
            }
            .hero h1 {
                font-size: 2rem;
            }
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .main-nav {
                display: none;
                width: 100%;
            }
            .header-inner {
                position: relative;
            }
            .nav-open .main-nav {
                display: flex;
            }
            .feedback-grid {
                grid-template-columns: 1fr;
            }
            .footer-inner {
                grid-template-columns: 1fr;
            }
            .hero h1 {
                font-size: 1.7rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .article-body h2 {
                font-size: 1.6rem;
            }
            .article-body h3 {
                font-size: 1.3rem;
            }
            .breadcrumb ol {
                font-size: 0.8rem;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 0.9rem;
            }
            .hero {
                padding: 2rem 0 1.5rem;
            }
            .hero h1 {
                font-size: 1.4rem;
            }
            .search-form {
                flex-direction: column;
            }
            .search-form button {
                width: 100%;
            }
        }
        @media print {
            .site-header,
            .breadcrumb,
            .sidebar,
            .feedback-section,
            .site-footer {
                display: none !important;
            }
            .content-grid {
                display: block;
            }
            body {
                font-size: 12pt;
                color: #000;
            }
        }