*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: #f4f7fa;
            color: #1a1a2e;
            line-height: 1.8;
            padding: 0;
            margin: 0;
        }
        a {
            color: #e67e22;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #d35400;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        ul,
        ol {
            padding-left: 1.8rem;
            margin: 1rem 0;
        }
        li {
            margin-bottom: 0.4rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.2rem;
        }
        .site-header {
            background: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
            color: #fff;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 800;
            color: #f1c40f;
            text-shadow: 2px 2px 0 #e67e22;
            letter-spacing: 2px;
            transition: transform 0.3s;
        }
        .my-logo:hover {
            transform: scale(1.03);
            color: #f39c12;
        }
        .my-logo a {
            color: inherit;
            text-decoration: none;
        }
        .my-logo span {
            color: #ecf0f1;
            font-weight: 300;
            font-size: 1rem;
            display: block;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 1.5rem;
        }
        .main-nav a {
            color: #ecf0f1;
            font-weight: 500;
            padding: 0.4rem 0.8rem;
            border-radius: 6px;
            transition: background 0.3s, color 0.3s;
            font-size: 0.95rem;
        }
        .main-nav a:hover {
            background: rgba(241, 196, 15, 0.2);
            color: #f1c40f;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.2rem 0.6rem;
            border-radius: 6px;
            transition: background 0.3s;
        }
        .hamburger:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .breadcrumb {
            background: #fff;
            padding: 0.8rem 0;
            border-bottom: 1px solid #e0e0e0;
            font-size: 0.9rem;
            color: #555;
        }
        .breadcrumb a {
            color: #e67e22;
        }
        .breadcrumb a:hover {
            color: #d35400;
        }
        .breadcrumb .sep {
            margin: 0 0.5rem;
            color: #aaa;
        }
        main {
            padding: 2.5rem 0;
        }
        .content-wrapper {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
        }
        @media (max-width: 992px) {
            .content-wrapper {
                grid-template-columns: 1fr;
            }
        }
        .article-body {
            background: #fff;
            border-radius: 16px;
            padding: 2.5rem;
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
        }
        h1 {
            font-size: 2.4rem;
            font-weight: 800;
            color: #1a1a2e;
            margin-bottom: 0.8rem;
            line-height: 1.3;
            border-left: 6px solid #f1c40f;
            padding-left: 1.2rem;
        }
        h2 {
            font-size: 1.8rem;
            font-weight: 700;
            color: #2c3e50;
            margin-top: 2.5rem;
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 3px solid #f1c40f;
        }
        h3 {
            font-size: 1.4rem;
            font-weight: 600;
            color: #34495e;
            margin-top: 2rem;
            margin-bottom: 0.8rem;
        }
        h4 {
            font-size: 1.15rem;
            font-weight: 600;
            color: #2c3e50;
            margin-top: 1.5rem;
            margin-bottom: 0.5rem;
        }
        .meta-info {
            display: flex;
            flex-wrap: wrap;
            gap: 1.2rem;
            color: #7f8c8d;
            font-size: 0.9rem;
            margin-bottom: 1.8rem;
            padding-bottom: 1rem;
            border-bottom: 1px solid #ecf0f1;
        }
        .meta-info i {
            margin-right: 0.4rem;
            color: #e67e22;
        }
        .last-updated {
            font-weight: 600;
            color: #2c3e50;
        }
        .featured-image {
            margin: 1.8rem 0 2.2rem;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
        }
        .featured-image img {
            width: 100%;
            max-height: 480px;
            object-fit: cover;
        }
        .featured-image figcaption {
            padding: 0.8rem 1.2rem;
            background: #f8f9fa;
            font-size: 0.85rem;
            color: #555;
            text-align: center;
            font-style: italic;
        }
        .sidebar {
            background: #fff;
            border-radius: 16px;
            padding: 1.8rem;
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
            position: sticky;
            top: 100px;
            align-self: start;
        }
        .sidebar h3 {
            font-size: 1.2rem;
            margin-top: 0;
            color: #e67e22;
            border-bottom: 2px solid #f1c40f;
            padding-bottom: 0.5rem;
        }
        .sidebar ul {
            list-style: none;
            padding: 0;
        }
        .sidebar ul li {
            padding: 0.5rem 0;
            border-bottom: 1px solid #f0f0f0;
        }
        .sidebar ul li a {
            font-size: 0.95rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .sidebar ul li a i {
            color: #f1c40f;
            font-size: 0.8rem;
        }
        .search-box {
            background: #f8f9fa;
            padding: 1.5rem;
            border-radius: 12px;
            margin: 2rem 0 1.5rem;
        }
        .search-box form {
            display: flex;
            gap: 0.8rem;
            flex-wrap: wrap;
        }
        .search-box input[type="text"] {
            flex: 1;
            min-width: 180px;
            padding: 0.8rem 1.2rem;
            border: 2px solid #ddd;
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s;
            outline: none;
        }
        .search-box input[type="text"]:focus {
            border-color: #e67e22;
        }
        .search-box button {
            padding: 0.8rem 2rem;
            background: #e67e22;
            color: #fff;
            border: none;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s, transform 0.2s;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .search-box button:hover {
            background: #d35400;
            transform: translateY(-2px);
        }
        .user-feedback {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
            margin: 2.5rem 0 1rem;
        }
        @media (max-width: 700px) {
            .user-feedback {
                grid-template-columns: 1fr;
            }
        }
        .feedback-card {
            background: #f8f9fa;
            padding: 1.8rem;
            border-radius: 14px;
            border: 1px solid #e8e8e8;
        }
        .feedback-card h4 {
            margin-top: 0;
            font-size: 1.2rem;
            color: #2c3e50;
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        .feedback-card form {
            display: flex;
            flex-direction: column;
            gap: 1rem;
            margin-top: 1rem;
        }
        .feedback-card textarea,
        .feedback-card input[type="text"],
        .feedback-card input[type="number"] {
            padding: 0.8rem 1rem;
            border: 2px solid #ddd;
            border-radius: 8px;
            font-size: 0.95rem;
            font-family: inherit;
            outline: none;
            transition: border 0.3s;
            resize: vertical;
        }
        .feedback-card textarea:focus,
        .feedback-card input:focus {
            border-color: #e67e22;
        }
        .feedback-card button {
            padding: 0.8rem 1.8rem;
            background: #2c3e50;
            color: #fff;
            border: none;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s, transform 0.2s;
            align-self: flex-start;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .feedback-card button:hover {
            background: #1a252f;
            transform: translateY(-2px);
        }
        .rating-stars {
            display: flex;
            gap: 0.3rem;
            font-size: 1.8rem;
            color: #f1c40f;
            cursor: pointer;
        }
        .rating-stars i {
            transition: transform 0.2s;
        }
        .rating-stars i:hover {
            transform: scale(1.2);
        }
        .highlight-box {
            background: linear-gradient(135deg, #fff9e6, #fff3cd);
            border-left: 6px solid #f1c40f;
            padding: 1.5rem 2rem;
            border-radius: 12px;
            margin: 1.8rem 0;
        }
        .highlight-box strong {
            color: #d35400;
        }
        .tip-box {
            background: #eaf7ee;
            border-left: 6px solid #27ae60;
            padding: 1.5rem 2rem;
            border-radius: 12px;
            margin: 1.8rem 0;
        }
        .tip-box strong {
            color: #1e8449;
        }
        .fact-box {
            background: #eaf2f8;
            border-left: 6px solid #3498db;
            padding: 1.5rem 2rem;
            border-radius: 12px;
            margin: 1.8rem 0;
        }
        .site-footer {
            background: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
            color: #ccc;
            padding: 2.5rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-inner {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2rem;
        }
        @media (max-width: 768px) {
            .footer-inner {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
        }
        .footer-inner h4 {
            color: #f1c40f;
            margin-top: 0;
            font-size: 1.1rem;
        }
        .footer-inner a {
            color: #bbb;
            transition: color 0.3s;
        }
        .footer-inner a:hover {
            color: #f1c40f;
        }
        .footer-inner ul {
            list-style: none;
            padding: 0;
        }
        .footer-inner ul li {
            padding: 0.3rem 0;
        }
        friend-link {
            display: block;
            margin-top: 0.8rem;
        }
        friend-link a {
            display: inline-block;
            padding: 0.4rem 0.8rem;
            background: rgba(241, 196, 15, 0.1);
            border-radius: 6px;
            margin: 0.2rem 0.4rem 0.2rem 0;
            font-size: 0.9rem;
            border: 1px solid rgba(241, 196, 15, 0.2);
        }
        friend-link a:hover {
            background: rgba(241, 196, 15, 0.2);
            color: #f1c40f;
        }
        .copyright {
            text-align: center;
            padding-top: 1.8rem;
            margin-top: 1.8rem;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            font-size: 0.85rem;
            color: #888;
        }
        .copyright strong {
            color: #f1c40f;
        }
        @media (max-width: 768px) {
            .header-inner {
                flex-direction: row;
                flex-wrap: wrap;
            }
            .my-logo {
                font-size: 1.5rem;
            }
            .hamburger {
                display: block;
            }
            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                gap: 0.5rem;
                padding-top: 1rem;
                border-top: 1px solid rgba(255, 255, 255, 0.1);
                margin-top: 0.8rem;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 0.6rem 0.8rem;
                font-size: 1rem;
            }
            .article-body {
                padding: 1.5rem;
            }
            h1 {
                font-size: 1.8rem;
                padding-left: 0.8rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            h3 {
                font-size: 1.2rem;
            }
            .content-wrapper {
                gap: 1.5rem;
            }
            .sidebar {
                position: static;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 0.8rem;
            }
            .article-body {
                padding: 1rem;
            }
            h1 {
                font-size: 1.5rem;
            }
            .meta-info {
                flex-direction: column;
                gap: 0.4rem;
            }
            .search-box form {
                flex-direction: column;
            }
            .search-box button {
                width: 100%;
                justify-content: center;
            }
            .feedback-card button {
                width: 100%;
                justify-content: center;
            }
        }
        .scroll-top {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            background: #e67e22;
            color: #fff;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            cursor: pointer;
            box-shadow: 0 4px 16px rgba(230, 126, 34, 0.4);
            transition: transform 0.3s, background 0.3s;
            border: none;
            z-index: 999;
        }
        .scroll-top:hover {
            transform: translateY(-4px);
            background: #d35400;
        }
        @media print {
            .site-header,
            .scroll-top,
            .search-box,
            .user-feedback,
            .sidebar {
                display: none !important;
            }
            .content-wrapper {
                grid-template-columns: 1fr;
            }
            .article-body {
                box-shadow: none;
                padding: 0;
            }
            body {
                background: #fff;
            }
        }