* { 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: 1.7;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            min-height: 100vh;
            padding-bottom: 2rem;
        }
        a { color: #4361ee; text-decoration: none; transition: color 0.3s ease; }
        a:hover { color: #3a0ca3; text-decoration: underline; }
        img { max-width: 100%; height: auto; display: block; }
        .container {
            width: 95%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }
        header {
            background: linear-gradient(90deg, #1a1a2e, #16213e);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            background: linear-gradient(45deg, #4cc9f0, #4361ee);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo:hover { text-decoration: none; }
        .my-logo i { color: #4cc9f0; }
        nav ul {
            display: flex;
            list-style: none;
            gap: 1.8rem;
        }
        nav a {
            color: #e2e8f0;
            font-weight: 500;
            padding: 0.5rem 0;
            position: relative;
        }
        nav a:hover { color: #4cc9f0; text-decoration: none; }
        nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: #4cc9f0;
            transition: width 0.3s ease;
        }
        nav a:hover::after { width: 100%; }
        .hamburger {
            display: none;
            font-size: 1.5rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .breadcrumb {
            background: #edf2f7;
            padding: 0.8rem 0;
            font-size: 0.9rem;
            color: #64748b;
            margin-bottom: 2rem;
        }
        .breadcrumb a { color: #4361ee; }
        .breadcrumb span { color: #94a3b8; }
        main { background: white; border-radius: 12px; padding: 2.5rem; box-shadow: 0 6px 20px rgba(0,0,0,0.08); margin-top: 1rem; }
        h1 {
            font-size: 2.8rem;
            color: #1a1a2e;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-left: 5px solid #4361ee;
            padding-left: 1rem;
        }
        h2 {
            font-size: 2rem;
            color: #1e40af;
            margin: 2.5rem 0 1.2rem 0;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #e2e8f0;
        }
        h3 {
            font-size: 1.6rem;
            color: #3730a3;
            margin: 2rem 0 1rem 0;
        }
        h4 {
            font-size: 1.3rem;
            color: #5b21b6;
            margin: 1.5rem 0 0.8rem 0;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            font-size: 1.1rem;
        }
        .lead {
            font-size: 1.3rem;
            color: #4f46e5;
            font-weight: 500;
            margin-bottom: 2rem;
            padding: 1rem;
            background: #f1f5f9;
            border-radius: 8px;
            border-left: 4px solid #4f46e5;
        }
        .highlight {
            background: linear-gradient(120deg, #a5b4fc30 0%, #a5b4fc30 100%);
            padding: 1.5rem;
            border-radius: 10px;
            border: 1px solid #c7d2fe;
            margin: 1.5rem 0;
        }
        .warning {
            background: #fef3c7;
            border-left: 5px solid #f59e0b;
            padding: 1rem 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .img-container {
            margin: 2.5rem auto;
            text-align: center;
            max-width: 800px;
        }
        .img-container img {
            border-radius: 10px;
            box-shadow: 0 8px 25px rgba(0,0,0,0.15);
            border: 1px solid #ddd;
        }
        .img-caption {
            font-style: italic;
            color: #64748b;
            margin-top: 0.8rem;
            font-size: 0.95rem;
        }
        ul, ol { margin: 1.5rem 0 1.5rem 2rem; }
        li { margin-bottom: 0.8rem; }
        .content-link {
            background: #e0e7ff;
            padding: 0.2rem 0.5rem;
            border-radius: 4px;
            font-weight: 500;
        }
        .content-link:hover { background: #c7d2fe; }
        .interactive-section {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
        }
        .feature-box {
            background: #f8fafc;
            border: 1px solid #e2e8f0;
            border-radius: 10px;
            padding: 1.8rem;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .feature-box:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(67, 97, 238, 0.15);
        }
        .feature-box h3 { margin-top: 0; }
        .feature-box form { display: flex; flex-direction: column; gap: 1rem; margin-top: 1rem; }
        .feature-box input, .feature-box textarea, .feature-box select {
            padding: 0.8rem;
            border: 1px solid #cbd5e1;
            border-radius: 6px;
            font-family: inherit;
        }
        .feature-box button {
            background: linear-gradient(45deg, #4361ee, #3a0ca3);
            color: white;
            border: none;
            padding: 0.9rem;
            border-radius: 6px;
            font-weight: 600;
            cursor: pointer;
            transition: opacity 0.3s ease;
        }
        .feature-box button:hover { opacity: 0.9; }
        .star-rating {
            display: flex;
            gap: 0.5rem;
            font-size: 1.8rem;
            color: #fbbf24;
            margin: 0.5rem 0;
            cursor: pointer;
        }
        .star-rating .star:hover { transform: scale(1.2); }
        footer {
            background: #1a1a2e;
            color: #cbd5e1;
            padding: 3rem 0 2rem;
            margin-top: 4rem;
            border-top: 5px solid #4361ee;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
        }
        .footer-section h3 {
            color: #f1f5f9;
            font-size: 1.3rem;
            margin-bottom: 1.2rem;
        }
        .footer-links { list-style: none; }
        .footer-links li { margin-bottom: 0.7rem; }
        .footer-links a { color: #94a3b8; }
        .footer-links a:hover { color: #4cc9f0; }
        friend-link {
            display: inline-block;
            background: rgba(255,255,255,0.05);
            padding: 0.5rem 1rem;
            border-radius: 20px;
            margin: 0.3rem;
            border: 1px solid #334155;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid #334155;
            color: #94a3b8;
            font-size: 0.9rem;
        }
        .update-time {
            background: #1e293b;
            color: #f8fafc;
            padding: 0.5rem 1rem;
            border-radius: 5px;
            display: inline-block;
            font-size: 0.9rem;
            margin-bottom: 1rem;
        }
        @media (max-width: 768px) {
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.7rem; }
            h3 { font-size: 1.4rem; }
            main { padding: 1.5rem; }
            nav ul {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: #16213e;
                padding: 1rem;
                box-shadow: 0 10px 15px rgba(0,0,0,0.2);
            }
            nav ul.active { display: flex; }
            .hamburger { display: block; }
            .header-content { position: relative; }
            .interactive-section { grid-template-columns: 1fr; }
        }