* {
            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-color: #f8f9fa;
            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; }
        .italic { font-style: italic; }
        .highlight {
            background-color: #fff3cd;
            padding: 2px 5px;
            border-radius: 3px;
        }
        .section-spacing {
            padding: 60px 0;
        }
        .btn {
            display: inline-block;
            padding: 12px 30px;
            background: linear-gradient(135deg, #1e3c72, #2a5298);
            color: white;
            text-decoration: none;
            border-radius: 50px;
            font-weight: 600;
            transition: all 0.3s ease;
            border: none;
            cursor: pointer;
        }
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.2);
            background: linear-gradient(135deg, #2a5298, #1e3c72);
        }
        .site-header {
            background-color: #0a2e5c;
            color: white;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 20px;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 900;
            color: #fff;
            text-decoration: none;
            font-family: 'Arial Black', sans-serif;
            letter-spacing: -1px;
            display: flex;
            align-items: center;
        }
        .my-logo span {
            color: #00b4ff;
            margin-left: 5px;
        }
        .my-logo:hover {
            color: #00b4ff;
        }
        .my-logo:hover span {
            color: #fff;
        }
        .nav-desktop {
            display: flex;
            gap: 30px;
        }
        @media (max-width: 992px) {
            .nav-desktop { display: none; }
        }
        .nav-desktop a {
            color: #e6e6e6;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.05rem;
            padding: 5px 0;
            position: relative;
            transition: color 0.3s;
        }
        .nav-desktop a:hover,
        .nav-desktop a.active {
            color: #00b4ff;
        }
        .nav-desktop a::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            background: #00b4ff;
            left: 0;
            bottom: -5px;
            transition: width 0.3s;
        }
        .nav-desktop a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 5px;
        }
        @media (max-width: 992px) {
            .hamburger { display: block; }
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background-color: #0a2e5c;
            padding: 20px;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            box-shadow: 0 5px 10px rgba(0,0,0,0.2);
            z-index: 999;
        }
        .nav-mobile.active {
            display: flex;
        }
        .nav-mobile a {
            color: #e6e6e6;
            text-decoration: none;
            padding: 15px 10px;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            font-weight: 600;
        }
        .nav-mobile a:hover {
            background-color: rgba(0, 180, 255, 0.2);
            color: #00b4ff;
        }
        .breadcrumb {
            padding: 15px 20px;
            background-color: #e9ecef;
            font-size: 0.9rem;
            border-bottom: 1px solid #dee2e6;
        }
        .breadcrumb a {
            color: #0a2e5c;
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .hero {
            background: linear-gradient(rgba(10, 46, 92, 0.85), rgba(10, 46, 92, 0.9)), url('https://images.unsplash.com/photo-1558618666-fcd25c85cd64?ixlib=rb-4.0.3&auto=format&fit=crop&w=1200&q=80') center/cover no-repeat;
            color: white;
            padding: 80px 20px;
            text-align: center;
            margin-bottom: 40px;
        }
        .hero h1 {
            font-size: 3.2rem;
            margin-bottom: 20px;
            text-shadow: 2px 2px 5px rgba(0,0,0,0.5);
        }
        @media (max-width: 768px) {
            .hero h1 { font-size: 2.5rem; }
        }
        .hero p {
            font-size: 1.3rem;
            max-width: 800px;
            margin: 0 auto 30px;
            opacity: 0.9;
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 50px;
            padding: 20px;
        }
        @media (max-width: 992px) {
            .main-content { grid-template-columns: 1fr; }
        }
        .article-content {
            background: white;
            padding: 40px;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
        }
        .sidebar {
            background: white;
            padding: 30px;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        h1, h2, h3, h4 {
            color: #0a2e5c;
            margin-top: 1.8em;
            margin-bottom: 0.8em;
            line-height: 1.3;
        }
        h1 { font-size: 2.8rem; }
        h2 { font-size: 2.2rem; border-bottom: 3px solid #00b4ff; padding-bottom: 10px; }
        h3 { font-size: 1.8rem; color: #2a5298; }
        h4 { font-size: 1.4rem; color: #555; }
        p {
            margin-bottom: 1.5em;
            font-size: 1.1rem;
            text-align: justify;
        }
        ul, ol {
            margin-bottom: 1.5em;
            padding-left: 2em;
        }
        li {
            margin-bottom: 0.8em;
        }
        a.content-link {
            color: #00b4ff;
            text-decoration: none;
            border-bottom: 1px dotted #00b4ff;
            font-weight: 600;
        }
        a.content-link:hover {
            color: #0a2e5c;
            border-bottom: 1px solid #0a2e5c;
        }
        .figure-container {
            margin: 40px 0;
            text-align: center;
        }
        .figure-container img {
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            margin: 0 auto;
        }
        figcaption {
            font-style: italic;
            color: #666;
            margin-top: 10px;
            font-size: 0.95rem;
        }
        .update-time {
            background-color: #e7f4ff;
            padding: 15px;
            border-radius: 10px;
            margin: 30px 0;
            border-left: 5px solid #00b4ff;
        }
        .update-time i {
            color: #00b4ff;
            margin-right: 10px;
        }
        .module {
            background: #f8f9fa;
            padding: 25px;
            border-radius: 10px;
            margin-bottom: 30px;
            border: 1px solid #dee2e6;
        }
        .module h3 {
            margin-top: 0;
            color: #0a2e5c;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .module h3 i {
            color: #00b4ff;
        }
        .form-group {
            margin-bottom: 20px;
        }
        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #555;
        }
        input, textarea, select {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ccc;
            border-radius: 8px;
            font-family: inherit;
            font-size: 1rem;
            transition: border 0.3s;
        }
        input:focus,
        textarea:focus,
        select:focus {
            outline: none;
            border-color: #00b4ff;
            box-shadow: 0 0 0 3px rgba(0, 180, 255, 0.2);
        }
        textarea {
            min-height: 120px;
            resize: vertical;
        }
        .star-rating {
            display: flex;
            gap: 10px;
            margin: 10px 0;
            font-size: 1.8rem;
            color: #ffc107;
        }
        .star-rating i {
            cursor: pointer;
            transition: transform 0.2s;
        }
        .star-rating i:hover {
            transform: scale(1.2);
        }
        .site-footer {
            background-color: #0a2e5c;
            color: #e6e6e6;
            padding: 60px 20px 30px;
            margin-top: 80px;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            max-width: 1200px;
            margin: 0 auto;
        }
        .footer-logo {
            font-size: 2rem;
            font-weight: 900;
            color: #fff;
            margin-bottom: 20px;
            display: block;
        }
        .footer-logo span {
            color: #00b4ff;
        }
        .footer-heading {
            color: #fff;
            font-size: 1.3rem;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-heading::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 50px;
            height: 3px;
            background: #00b4ff;
        }
        .footer-links a {
            display: block;
            color: #b0b0b0;
            text-decoration: none;
            margin-bottom: 12px;
            transition: color 0.3s, padding-left 0.3s;
        }
        .footer-links a:hover {
            color: #00b4ff;
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background: rgba(255,255,255,0.05);
            padding: 15px;
            border-radius: 8px;
            margin-bottom: 15px;
        }
        friend-link a {
            color: #00b4ff;
            text-decoration: none;
            font-weight: 600;
        }
        friend-link a:hover {
            text-decoration: underline;
        }
        .copyright {
            text-align: center;
            padding-top: 40px;
            margin-top: 40px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #b0b0b0;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .hero { padding: 50px 20px; }
            .article-content, .sidebar { padding: 25px; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.9rem; }
            h3 { font-size: 1.6rem; }
            .main-content { padding: 10px; gap: 30px; }
        }