:root {
            --primary: #1a237e;
            --secondary: #ff4081;
            --accent: #00bcd4;
            --dark: #121212;
            --light: #f5f5f7;
            --gray: #2d2d2d;
            --shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
            --radius: 12px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            line-height: 1.8;
            color: var(--light);
            background: linear-gradient(135deg, var(--dark) 0%, #1e1b2e 100%);
            min-height: 100vh;
        }
        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: rgba(26, 35, 126, 0.95);
            backdrop-filter: blur(10px);
            position: sticky;
            top: 0;
            z-index: 1000;
            border-bottom: 3px solid var(--secondary);
        }
        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 900;
            color: var(--accent);
            text-decoration: none;
            text-transform: uppercase;
            letter-spacing: 2px;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo:hover {
            color: var(--secondary);
            transform: scale(1.05);
        }
        .my-logo i {
            font-size: 2.5rem;
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 25px;
        }
        .main-nav a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            padding: 10px 15px;
            border-radius: var(--radius);
            transition: all 0.3s;
        }
        .main-nav a:hover {
            background: var(--secondary);
            color: var(--dark);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .breadcrumb {
            padding: 15px 0;
            background: rgba(255, 255, 255, 0.05);
            margin-bottom: 30px;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            gap: 10px;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--accent);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        main {
            padding: 30px 0 60px;
        }
        article {
            background: rgba(45, 45, 45, 0.7);
            border-radius: var(--radius);
            padding: 40px;
            box-shadow: var(--shadow);
            margin-bottom: 40px;
        }
        h1, h2, h3, h4 {
            color: var(--accent);
            margin-top: 1.5em;
            margin-bottom: 0.7em;
            line-height: 1.3;
        }
        h1 {
            font-size: 3.2rem;
            text-align: center;
            border-bottom: 4px solid var(--secondary);
            padding-bottom: 20px;
            margin-top: 0;
        }
        h2 {
            font-size: 2.4rem;
            border-left: 6px solid var(--secondary);
            padding-left: 15px;
        }
        h3 {
            font-size: 1.8rem;
        }
        h4 {
            font-size: 1.4rem;
            color: var(--secondary);
        }
        p {
            margin-bottom: 1.5em;
            text-align: justify;
            font-size: 1.1rem;
        }
        .highlight {
            background: linear-gradient(90deg, rgba(26, 35, 126, 0.3) 0%, rgba(255, 64, 129, 0.2) 100%);
            border-left: 5px solid var(--accent);
            padding: 25px;
            margin: 30px 0;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius);
            margin: 30px auto;
            display: block;
            box-shadow: var(--shadow);
            border: 3px solid var(--accent);
        }
        .function-card {
            background: rgba(26, 35, 126, 0.2);
            border-radius: var(--radius);
            padding: 25px;
            margin: 40px 0;
            border: 1px solid var(--accent);
        }
        .function-card h3 {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--secondary);
        }
        .function-card form {
            display: grid;
            gap: 15px;
            max-width: 500px;
        }
        input, textarea, select {
            padding: 14px;
            border: 2px solid var(--gray);
            border-radius: 8px;
            background: rgba(255, 255, 255, 0.1);
            color: white;
            font-size: 1rem;
            transition: border 0.3s;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--accent);
        }
        button {
            padding: 14px 28px;
            background: linear-gradient(45deg, var(--secondary), #ff79a9);
            color: white;
            border: none;
            border-radius: 8px;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s;
            font-size: 1.1rem;
        }
        button:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(255, 64, 129, 0.3);
        }
        footer {
            background: rgba(18, 18, 18, 0.95);
            padding: 50px 0 20px;
            border-top: 3px solid var(--primary);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-section h4 {
            color: var(--accent);
            margin-bottom: 20px;
            font-size: 1.3rem;
        }
        friend-link {
            display: block;
            margin-bottom: 12px;
        }
        friend-link a {
            color: #ccc;
            text-decoration: none;
            transition: all 0.3s;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        friend-link a:hover {
            color: var(--secondary);
            padding-left: 5px;
        }
        .copyright {
            text-align: center;
            padding-top: 25px;
            border-top: 1px solid var(--gray);
            color: #aaa;
            font-size: 0.95rem;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.7rem; }
            h2 { font-size: 2.1rem; }
            article { padding: 30px; }
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .main-nav ul {
                flex-direction: column;
                position: fixed;
                top: 80px;
                left: 0;
                width: 100%;
                background: rgba(26, 35, 126, 0.98);
                padding: 20px;
                display: none;
                z-index: 999;
            }
            .main-nav.active ul {
                display: flex;
            }
            .header-inner {
                flex-wrap: wrap;
            }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 480px) {
            .container { padding: 0 15px; }
            article { padding: 20px; }
            h1 { font-size: 1.9rem; }
            .my-logo { font-size: 1.8rem; }
        }
        .emoji { font-size: 1.2em; margin-right: 5px; }
        .strong { color: var(--secondary); font-weight: 800; }
        .update-time {
            display: inline-block;
            background: var(--primary);
            color: white;
            padding: 8px 15px;
            border-radius: 20px;
            font-size: 0.9rem;
            margin-bottom: 20px;
        }
        .link-inline {
            color: var(--secondary);
            text-decoration: underline;
            font-weight: 600;
        }
        .link-inline:hover {
            color: var(--accent);
        }