* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            line-height: 1.6;
            color: #e0e0e0;
            background: #0f1419;
            background-image: radial-gradient(circle at 15% 50%, rgba(30, 60, 114, 0.1) 0%, transparent 55%),
                              radial-gradient(circle at 85% 30%, rgba(114, 30, 90, 0.1) 0%, transparent 55%);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a { color: #6ab0ff; text-decoration: none; transition: color 0.3s ease, transform 0.2s ease; }
        a:hover { color: #a3d4ff; transform: translateY(-1px); }
        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 { color: #ffcc66; }
        .emoji { font-style: normal; margin-right: 5px; }
        .site-header {
            background: rgba(15, 20, 25, 0.92);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid #2a3441;
            position: sticky;
            top: 0;
            z-index: 1000;
            padding: 15px 0;
        }
        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            background: linear-gradient(90deg, #6ab0ff, #ff66c4);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.5px;
        }
        .my-logo:hover { transform: scale(1.03); }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        .main-nav a {
            color: #b0b8c5;
            font-weight: 500;
            padding: 8px 0;
            position: relative;
        }
        .main-nav a:hover { color: #fff; }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, #6ab0ff, #ff66c4);
            transition: width 0.3s ease;
        }
        .main-nav a:hover::after { width: 100%; }
        .breadcrumb {
            padding: 15px 0;
            font-size: 0.9rem;
            color: #8a9ba8;
            border-bottom: 1px solid #2a3441;
        }
        .breadcrumb a { color: #8a9ba8; }
        .breadcrumb a:hover { color: #6ab0ff; }
        .hamburger {
            display: none;
            font-size: 1.5rem;
            background: none;
            border: none;
            color: #b0b8c5;
            cursor: pointer;
            padding: 5px;
        }
        .main-content {
            flex: 1;
            padding: 40px 0;
        }
        article {
            background: rgba(25, 32, 45, 0.7);
            border-radius: 16px;
            padding: 40px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
            border: 1px solid #2a3441;
            margin-bottom: 40px;
        }
        h1, h2, h3, h4 {
            color: #fff;
            line-height: 1.3;
            margin-top: 1.8em;
            margin-bottom: 0.7em;
            font-weight: 700;
        }
        h1 {
            font-size: 2.8rem;
            margin-top: 0;
            background: linear-gradient(90deg, #fff, #6ab0ff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-align: center;
            padding-bottom: 20px;
            border-bottom: 2px solid #2a3441;
        }
        h2 {
            font-size: 2rem;
            color: #ffcc66;
            padding-left: 15px;
            border-left: 5px solid #ff9966;
        }
        h3 { font-size: 1.6rem; color: #a3d4ff; }
        h4 { font-size: 1.3rem; color: #b0b8c5; }
        p {
            margin-bottom: 1.5em;
            font-size: 1.1rem;
            text-align: justify;
            hyphens: auto;
        }
        .intro {
            font-size: 1.3rem;
            color: #c0c8d5;
            border-left: 4px solid #6ab0ff;
            padding-left: 20px;
            margin-bottom: 2.5em;
        }
        .feature-img {
            width: 100%;
            border-radius: 12px;
            overflow: hidden;
            margin: 30px 0;
            border: 2px solid #3a4555;
            box-shadow: 0 15px 25px rgba(0, 0, 0, 0.5);
        }
        .feature-img img {
            width: 100%;
            transition: transform 0.5s ease;
        }
        .feature-img:hover img { transform: scale(1.02); }
        .interactive-module {
            background: linear-gradient(145deg, rgba(40, 50, 70, 0.8), rgba(20, 25, 35, 0.8));
            border-radius: 12px;
            padding: 25px;
            margin: 40px 0;
            border: 1px solid #3a4a60;
        }
        .module-title {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 20px;
            color: #ffcc66;
        }
        .module-title i { font-size: 1.5rem; }
        .form-group {
            margin-bottom: 20px;
        }
        label {
            display: block;
            margin-bottom: 8px;
            color: #b0b8c5;
            font-weight: 500;
        }
        input, textarea, select {
            width: 100%;
            padding: 12px 15px;
            background: rgba(15, 20, 25, 0.7);
            border: 1px solid #4a5a70;
            border-radius: 8px;
            color: #e0e0e0;
            font-size: 1rem;
            transition: border-color 0.3s ease;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #6ab0ff;
            box-shadow: 0 0 0 3px rgba(106, 176, 255, 0.2);
        }
        button, .btn {
            background: linear-gradient(90deg, #4a8cff, #6ab0ff);
            color: white;
            border: none;
            padding: 12px 25px;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: inline-block;
        }
        button:hover, .btn:hover {
            background: linear-gradient(90deg, #6ab0ff, #8ac4ff);
            transform: translateY(-2px);
            box-shadow: 0 7px 14px rgba(106, 176, 255, 0.3);
        }
        .rating-stars {
            display: flex;
            gap: 10px;
            font-size: 2rem;
            color: #4a5a70;
            margin: 15px 0;
        }
        .rating-stars .star {
            cursor: pointer;
            transition: color 0.2s ease;
        }
        .rating-stars .star:hover,
        .rating-stars .star.active { color: #ffcc00; }
        .site-footer {
            background: rgba(10, 15, 20, 0.95);
            border-top: 1px solid #2a3441;
            padding: 40px 0 20px;
            margin-top: 60px;
        }
        .footer-links {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 30px;
            margin-bottom: 30px;
        }
        .footer-col h4 {
            color: #ffcc66;
            font-size: 1.2rem;
            margin-bottom: 20px;
        }
        .footer-col ul {
            list-style: none;
        }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col a { color: #b0b8c5; }
        .footer-col a:hover { color: #6ab0ff; }
        friend-link {
            display: block;
            padding: 10px 15px;
            background: rgba(255, 255, 255, 0.05);
            border-radius: 6px;
            margin-bottom: 8px;
            border-left: 3px solid #6ab0ff;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #2a3441;
            color: #8a9ba8;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 1.8rem; }
            .main-nav ul { gap: 20px; }
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .main-nav {
                position: fixed;
                top: 70px;
                left: 0;
                width: 100%;
                background: rgba(15, 20, 25, 0.98);
                backdrop-filter: blur(10px);
                padding: 20px;
                border-bottom: 1px solid #2a3441;
                transform: translateY(-100%);
                opacity: 0;
                visibility: hidden;
                transition: all 0.3s ease;
            }
            .main-nav.active {
                transform: translateY(0);
                opacity: 1;
                visibility: visible;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 15px;
            }
            .header-inner { padding: 0 15px; }
            article { padding: 25px; }
            .interactive-module { padding: 20px; }
        }
        @media (max-width: 480px) {
            h1 { font-size: 2rem; }
            .container { padding: 0 15px; }
            .intro { font-size: 1.1rem; }
        }