* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            min-height: 100vh;
        }
        a {
            text-decoration: none;
            color: #2a6ebb;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #1d4f91;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .site-header {
            background: #1a237e;
            color: white;
            padding: 1rem 2rem;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            max-width: 1200px;
            margin: 0 auto;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 900;
            text-transform: uppercase;
            letter-spacing: 2px;
            color: #ffeb3b;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }
        .my-logo:hover {
            color: #fff;
        }
        .nav-main {
            display: flex;
            gap: 2rem;
        }
        .nav-main a {
            color: #e8eaf6;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 5px;
        }
        .nav-main a:hover {
            background: rgba(255, 255, 255, 0.2);
            color: #ffeb3b;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: #ffeb3b;
        }
        .breadcrumb {
            background: #e8eaf6;
            padding: 0.8rem 2rem;
            font-size: 0.9rem;
            border-bottom: 1px solid #c5cae9;
        }
        .breadcrumb a {
            color: #5c6bc0;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .content-wrapper {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            max-width: 1200px;
            margin: 2rem auto;
            padding: 0 2rem;
        }
        .main-content {
            background: white;
            padding: 2.5rem;
            border-radius: 15px;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
        }
        .sidebar {
            background: white;
            padding: 1.5rem;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        article {
            margin-bottom: 2.5rem;
        }
        h1 {
            font-size: 2.8rem;
            color: #1a237e;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 4px solid #ffeb3b;
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 2rem;
            color: #303f9f;
            margin: 2rem 0 1rem;
            padding-left: 0.5rem;
            border-left: 5px solid #5c6bc0;
        }
        h3 {
            font-size: 1.5rem;
            color: #5c6bc0;
            margin: 1.5rem 0 0.8rem;
        }
        h4 {
            font-size: 1.2rem;
            color: #7986cb;
            margin: 1.2rem 0 0.6rem;
        }
        p {
            margin-bottom: 1.2rem;
            text-align: justify;
            font-size: 1.05rem;
        }
        .highlight {
            background: #fffde7;
            padding: 1.2rem;
            border-left: 5px solid #ffeb3b;
            margin: 1.5rem 0;
            border-radius: 0 10px 10px 0;
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 0.3rem;
        }
        .featured-image {
            margin: 2rem auto;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 6px 18px rgba(0,0,0,0.1);
            max-width: 800px;
        }
        .featured-image figcaption {
            text-align: center;
            font-style: italic;
            color: #666;
            padding: 0.5rem;
            background: #f9f9f9;
        }
        .internal-links {
            list-style: none;
            padding: 1rem;
            background: #f3f4ff;
            border-radius: 10px;
            margin: 1.5rem 0;
        }
        .internal-links li {
            margin-bottom: 0.5rem;
        }
        .internal-links a {
            color: #3949ab;
            font-weight: 600;
        }
        .internal-links a:hover {
            text-decoration: underline;
        }
        .update-time {
            font-size: 0.9rem;
            color: #777;
            text-align: right;
            margin-top: 2rem;
            padding-top: 1rem;
            border-top: 1px dashed #ccc;
        }
        .interaction-section {
            background: #f8f9ff;
            padding: 2rem;
            border-radius: 12px;
            margin-top: 3rem;
        }
        .interaction-section h2 {
            color: #1a237e;
            border-left: none;
            padding-left: 0;
            text-align: center;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 1.2rem;
            margin-top: 1.5rem;
        }
        .form-group {
            display: flex;
            flex-direction: column;
        }
        label {
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: #444;
        }
        input, textarea, select {
            padding: 0.8rem;
            border: 1px solid #c5cae9;
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s ease;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #5c6bc0;
            box-shadow: 0 0 0 3px rgba(92, 107, 192, 0.2);
        }
        button {
            background: linear-gradient(to right, #5c6bc0, #3949ab);
            color: white;
            border: none;
            padding: 0.9rem 1.5rem;
            border-radius: 8px;
            font-size: 1rem;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s ease;
            align-self: flex-start;
        }
        button:hover {
            background: linear-gradient(to right, #3949ab, #283593);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        .site-footer {
            background: #1a237e;
            color: #e8eaf6;
            padding: 2.5rem 2rem;
            margin-top: 3rem;
        }
        .footer-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }
        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
            justify-content: center;
        }
        friend-link {
            background: rgba(255, 255, 255, 0.1);
            padding: 0.8rem 1.5rem;
            border-radius: 25px;
            transition: background 0.3s ease;
        }
        friend-link:hover {
            background: rgba(255, 255, 255, 0.2);
        }
        friend-link a {
            color: #ffeb3b;
            font-weight: 600;
        }
        .copyright {
            text-align: center;
            font-size: 0.9rem;
            color: #c5cae9;
            border-top: 1px solid #3949ab;
            padding-top: 1.5rem;
        }
        @media (max-width: 992px) {
            .content-wrapper {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                flex-wrap: wrap;
            }
            .nav-main {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #283593;
                position: absolute;
                top: 100%;
                left: 0;
                padding: 1rem 0;
                border-top: 1px solid #3949ab;
            }
            .nav-main.active {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
            .main-content {
                padding: 1.5rem;
            }
            .site-header, .breadcrumb {
                padding: 1rem;
            }
        }
        @media (max-width: 480px) {
            .content-wrapper {
                padding: 0 1rem;
            }
            button {
                align-self: stretch;
                text-align: center;
            }
        }
        ::selection {
            background: #ffeb3b;
            color: #1a237e;
        }
        .tooltip {
            position: relative;
            display: inline-block;
            border-bottom: 1px dotted #5c6bc0;
            cursor: help;
        }
        .tooltip .tooltiptext {
            visibility: hidden;
            width: 200px;
            background-color: #333;
            color: #fff;
            text-align: center;
            border-radius: 6px;
            padding: 5px;
            position: absolute;
            z-index: 1;
            bottom: 125%;
            left: 50%;
            transform: translateX(-50%);
            opacity: 0;
            transition: opacity 0.3s;
            font-size: 0.9rem;
        }
        .tooltip:hover .tooltiptext {
            visibility: visible;
            opacity: 1;
        }
        .rating-stars {
            display: flex;
            gap: 0.3rem;
            margin: 0.5rem 0;
        }
        .rating-stars i {
            color: #ffc107;
            cursor: pointer;
            transition: transform 0.2s;
        }
        .rating-stars i:hover {
            transform: scale(1.2);
        }