* {
            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;
            max-width: 100vw;
            overflow-x: hidden;
        }
        a {
            color: #2a5caa;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #e63946;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .section {
            padding: 60px 0;
        }
        .hidden {
            display: none !important;
        }
        .site-header {
            background: linear-gradient(135deg, #1e3c72, #2a5298);
            color: white;
            padding: 1rem 0;
            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;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i {
            color: #4cd964;
        }
        .my-logo:hover {
            color: #ffdd59;
        }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
        }
        .nav-desktop a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 4px;
        }
        .nav-desktop a:hover {
            background-color: rgba(255, 255, 255, 0.15);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 5px;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
        }
        .nav-mobile {
            position: fixed;
            top: 70px;
            left: 0;
            width: 100%;
            background: #1e3c72;
            flex-direction: column;
            padding: 1rem;
            gap: 1rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
            transform: translateY(-100%);
            opacity: 0;
            transition: transform 0.4s ease, opacity 0.4s ease;
            z-index: 999;
        }
        .nav-mobile.active {
            transform: translateY(0);
            opacity: 1;
            display: flex;
        }
        .nav-mobile a {
            color: white;
            padding: 1rem;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            font-weight: 600;
        }
        .breadcrumb {
            background-color: #e9ecef;
            padding: 1rem;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
        .breadcrumb a {
            color: #555;
        }
        .breadcrumb a:hover {
            color: #2a5caa;
        }
        .breadcrumb span {
            color: #777;
        }
        .hero {
            background: linear-gradient(rgba(42, 82, 152, 0.85), rgba(30, 60, 114, 0.9)), url('https://images.unsplash.com/photo-1518834103328-93d45986dce1?ixlib=rb-4.0.3&auto=format&fit=crop&w=1200&q=80') center/cover no-repeat;
            color: white;
            text-align: center;
            padding: 5rem 1rem;
            border-radius: 0 0 20px 20px;
            margin-bottom: 3rem;
        }
        .hero h1 {
            font-size: 3.2rem;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
        }
        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2.5rem;
            }
        }
        .hero p {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto 2rem;
            opacity: 0.95;
        }
        .content-area {
            background: white;
            border-radius: 12px;
            padding: 3rem;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
            margin-bottom: 3rem;
        }
        @media (max-width: 768px) {
            .content-area {
                padding: 2rem 1.5rem;
            }
        }
        h1, h2, h3, h4 {
            color: #1e3c72;
            margin-top: 2.5rem;
            margin-bottom: 1rem;
            line-height: 1.3;
        }
        h1 {
            font-size: 2.8rem;
            border-bottom: 3px solid #4cd964;
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 2.2rem;
            border-left: 5px solid #e63946;
            padding-left: 15px;
        }
        h3 {
            font-size: 1.8rem;
            color: #2a5298;
        }
        h4 {
            font-size: 1.4rem;
            color: #555;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            font-size: 1.1rem;
        }
        .lead {
            font-size: 1.3rem;
            font-weight: 500;
            color: #444;
            background-color: #f1f8ff;
            padding: 1.5rem;
            border-radius: 10px;
            border-left: 4px solid #2a5caa;
        }
        .highlight {
            background-color: #fff9db;
            padding: 0.2rem 0.5rem;
            border-radius: 3px;
            font-weight: 600;
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 5px;
        }
        .info-box {
            background: #e8f4fc;
            border-left: 5px solid #2a5caa;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .info-box h4 {
            margin-top: 0;
            color: #1e3c72;
        }
        .figure {
            margin: 2.5rem 0;
            text-align: center;
        }
        .figure img {
            border-radius: 12px;
            box-shadow: 0 8px 20px rgba(0,0,0,0.1);
            border: 1px solid #eee;
        }
        .figcaption {
            font-style: italic;
            color: #666;
            margin-top: 0.8rem;
            font-size: 0.95rem;
        }
        .content-link {
            color: #d35400;
            border-bottom: 1px dotted #d35400;
            font-weight: 600;
        }
        .content-link:hover {
            color: #a52714;
            border-bottom: 1px solid #a52714;
        }
        .interactive-module {
            background: #f8f9fa;
            border: 2px dashed #ced4da;
            border-radius: 12px;
            padding: 2rem;
            margin: 3rem 0;
            text-align: center;
        }
        .module-title {
            font-size: 1.8rem;
            margin-bottom: 1.5rem;
            color: #1e3c72;
        }
        .form-group {
            margin-bottom: 1.5rem;
            text-align: left;
        }
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: #444;
        }
        input, textarea, select {
            width: 100%;
            padding: 0.9rem;
            border: 1px solid #ced4da;
            border-radius: 8px;
            font-family: inherit;
            font-size: 1rem;
            transition: border 0.3s, box-shadow 0.3s;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #2a5caa;
            box-shadow: 0 0 0 3px rgba(42, 92, 170, 0.2);
        }
        .btn {
            background: linear-gradient(to right, #2a5caa, #1e3c72);
            color: white;
            border: none;
            padding: 1rem 2rem;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: inline-block;
        }
        .btn:hover {
            background: linear-gradient(to right, #e63946, #c1121f);
            transform: translateY(-3px);
            box-shadow: 0 7px 14px rgba(0,0,0,0.15);
        }
        .rating-stars {
            display: flex;
            justify-content: center;
            gap: 10px;
            margin: 1rem 0;
            font-size: 2rem;
            color: #ffc107;
        }
        .rating-stars i {
            cursor: pointer;
            transition: transform 0.2s;
        }
        .rating-stars i:hover {
            transform: scale(1.2);
        }
        .site-footer {
            background: #1a1a2e;
            color: #ddd;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
        }
        .footer-section h3 {
            color: #fff;
            font-size: 1.5rem;
            margin-bottom: 1.5rem;
            border-bottom: 2px solid #2a5caa;
            padding-bottom: 0.5rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #aaa;
        }
        .footer-links a:hover {
            color: #4cd964;
        }
        friend-link {
            display: block;
            background: #252547;
            padding: 1.5rem;
            border-radius: 8px;
            margin: 1.5rem 0;
            border-left: 5px solid #e63946;
        }
        friend-link a {
            color: #ffdd59;
            font-weight: 700;
            font-size: 1.2rem;
        }
        .copyright {
            text-align: center;
            margin-top: 3rem;
            padding-top: 1.5rem;
            border-top: 1px solid #333;
            color: #aaa;
            font-size: 0.9rem;
        }
        .update-time {
            color: #4cd964;
            font-weight: bold;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0,0,0,0);
            border: 0;
        }