*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        :root {
            --primary: #1a3a5c;
            --primary-light: #2a5a8c;
            --accent: #f5a623;
            --accent-dark: #d48e1a;
            --bg: #f4f7fa;
            --card-bg: #ffffff;
            --text: #1e2a3a;
            --text-light: #4a5a6a;
            --border: #dce4ec;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            --radius: 14px;
            --transition: 0.25s ease;
            --font: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
            --max-width: 1200px;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            padding: 0 0 0 0;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover,
        a:focus {
            color: var(--accent-dark);
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius);
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: var(--primary);
            color: #fff;
            padding: 16px 0;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
        }
        header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
        }
        .my-logo {
            font-size: 1.6rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #f5a623, #ffd966);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-shadow: none;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .my-logo i {
            -webkit-text-fill-color: #f5a623;
            font-size: 1.4rem;
        }
        .my-logo:hover {
            opacity: 0.9;
            text-decoration: none;
        }
        .my-logo small {
            font-size: 0.7rem;
            font-weight: 400;
            -webkit-text-fill-color: rgba(255, 255, 255, 0.7);
            display: block;
            letter-spacing: 0.3px;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 6px;
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        nav ul {
            list-style: none;
            display: flex;
            gap: 6px;
            flex-wrap: wrap;
            align-items: center;
        }
        nav ul li a {
            color: rgba(255, 255, 255, 0.85);
            padding: 8px 14px;
            border-radius: 30px;
            font-weight: 500;
            font-size: 0.92rem;
            transition: background var(--transition), color var(--transition);
            display: block;
        }
        nav ul li a:hover,
        nav ul li a:focus {
            background: rgba(255, 255, 255, 0.15);
            color: #fff;
            text-decoration: none;
        }
        nav ul li a.active {
            background: var(--accent);
            color: var(--primary);
        }
        .breadcrumb {
            background: #e8edf3;
            padding: 10px 0;
            font-size: 0.85rem;
            color: var(--text-light);
        }
        .breadcrumb .container {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 6px;
        }
        .breadcrumb a {
            color: var(--primary-light);
        }
        .breadcrumb span {
            color: var(--text-light);
        }
        main {
            padding: 30px 0 50px;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        @media (max-width: 960px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
        }
        .article-body h1 {
            font-size: 2.4rem;
            font-weight: 800;
            line-height: 1.2;
            margin: 0 0 12px 0;
            color: var(--primary);
        }
        .article-body h2 {
            font-size: 1.7rem;
            font-weight: 700;
            margin: 40px 0 14px 0;
            padding-bottom: 8px;
            border-bottom: 3px solid var(--accent);
            color: var(--primary);
        }
        .article-body h3 {
            font-size: 1.3rem;
            font-weight: 600;
            margin: 28px 0 10px 0;
            color: var(--primary-light);
        }
        .article-body h4 {
            font-size: 1.1rem;
            font-weight: 600;
            margin: 20px 0 8px 0;
            color: var(--text);
        }
        .article-body p {
            margin: 0 0 16px 0;
            color: var(--text);
        }
        .article-body ul,
        .article-body ol {
            margin: 0 0 20px 28px;
        }
        .article-body li {
            margin-bottom: 6px;
        }
        .article-body .highlight-box {
            background: #eef4ff;
            border-left: 5px solid var(--accent);
            padding: 18px 22px;
            border-radius: 0 var(--radius) var(--radius) 0;
            margin: 24px 0;
        }
        .article-body .highlight-box p:last-child {
            margin-bottom: 0;
        }
        .article-body .emoji-big {
            font-size: 1.4rem;
            display: inline-block;
            margin-right: 4px;
        }
        .meta-info {
            display: flex;
            flex-wrap: wrap;
            gap: 16px 28px;
            font-size: 0.9rem;
            color: var(--text-light);
            margin: 8px 0 20px 0;
            padding: 12px 0;
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }
        .meta-info i {
            margin-right: 6px;
            color: var(--accent);
        }
        .last-updated {
            font-weight: 600;
            color: var(--primary);
        }
        .featured-image {
            margin: 24px 0 28px;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .featured-image img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
            background: #dce4ec;
        }
        .featured-image figcaption {
            background: var(--card-bg);
            padding: 10px 16px;
            font-size: 0.85rem;
            color: var(--text-light);
            border-top: 1px solid var(--border);
        }
        .sidebar {
            position: sticky;
            top: 100px;
            align-self: start;
        }
        .sidebar-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 22px 20px;
            box-shadow: var(--shadow);
            margin-bottom: 24px;
        }
        .sidebar-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--primary);
            border-left: 4px solid var(--accent);
            padding-left: 12px;
        }
        .sidebar-card ul {
            list-style: none;
            margin: 0;
        }
        .sidebar-card ul li {
            padding: 8px 0;
            border-bottom: 1px solid var(--border);
        }
        .sidebar-card ul li:last-child {
            border-bottom: none;
        }
        .sidebar-card ul li a {
            font-weight: 500;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .sidebar-card ul li a i {
            color: var(--accent);
            font-size: 0.8rem;
        }
        .search-form {
            display: flex;
            gap: 8px;
            margin: 12px 0 4px;
        }
        .search-form input {
            flex: 1;
            padding: 10px 14px;
            border: 2px solid var(--border);
            border-radius: 30px;
            font-size: 0.95rem;
            outline: none;
            transition: border var(--transition);
        }
        .search-form input:focus {
            border-color: var(--accent);
        }
        .search-form button {
            background: var(--accent);
            border: none;
            border-radius: 30px;
            padding: 10px 18px;
            color: var(--primary);
            font-weight: 600;
            cursor: pointer;
            transition: background var(--transition);
            font-size: 0.95rem;
        }
        .search-form button:hover {
            background: var(--accent-dark);
        }
        .feedback-section {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 28px 26px;
            box-shadow: var(--shadow);
            margin: 40px 0 20px;
        }
        .feedback-section h2 {
            border-bottom: none !important;
            margin-top: 0 !important;
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
            margin-top: 16px;
        }
        @media (max-width: 640px) {
            .feedback-grid {
                grid-template-columns: 1fr;
            }
        }
        .feedback-form label {
            display: block;
            font-weight: 600;
            margin: 12px 0 4px;
            font-size: 0.95rem;
        }
        .feedback-form input,
        .feedback-form textarea,
        .feedback-form select {
            width: 100%;
            padding: 10px 14px;
            border: 2px solid var(--border);
            border-radius: 8px;
            font-size: 0.95rem;
            font-family: var(--font);
            outline: none;
            transition: border var(--transition);
        }
        .feedback-form input:focus,
        .feedback-form textarea:focus,
        .feedback-form select:focus {
            border-color: var(--accent);
        }
        .feedback-form textarea {
            min-height: 90px;
            resize: vertical;
        }
        .feedback-form .btn {
            background: var(--primary);
            color: #fff;
            border: none;
            padding: 12px 28px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: background var(--transition);
            margin-top: 14px;
            display: inline-block;
        }
        .feedback-form .btn:hover {
            background: var(--primary-light);
        }
        .rating-stars {
            display: flex;
            gap: 6px;
            font-size: 1.6rem;
            color: #ddd;
            cursor: pointer;
            margin: 6px 0 4px;
        }
        .rating-stars i {
            transition: color var(--transition);
        }
        .rating-stars i.active,
        .rating-stars i:hover {
            color: var(--accent);
        }
        footer {
            background: var(--primary);
            color: rgba(255, 255, 255, 0.8);
            padding: 36px 0 20px;
            margin-top: 40px;
        }
        footer .container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
        }
        @media (max-width: 640px) {
            footer .container {
                grid-template-columns: 1fr;
            }
        }
        footer h4 {
            color: #fff;
            font-size: 1.05rem;
            margin-bottom: 12px;
            border-left: 3px solid var(--accent);
            padding-left: 12px;
        }
        footer a {
            color: rgba(255, 255, 255, 0.7);
        }
        footer a:hover {
            color: var(--accent);
        }
        friend-link {
            display: block;
            background: rgba(255, 255, 255, 0.05);
            padding: 14px 18px;
            border-radius: var(--radius);
            margin: 12px 0;
        }
        friend-link a {
            display: inline-block;
            margin: 4px 12px 4px 0;
        }
        .copyright {
            grid-column: 1 / -1;
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.15);
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
        }
        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            nav ul {
                display: none;
                flex-direction: column;
                width: 100%;
                background: var(--primary-light);
                padding: 12px 0;
                border-radius: 12px;
                margin-top: 8px;
            }
            nav ul.open {
                display: flex;
            }
            nav ul li a {
                padding: 10px 20px;
                border-radius: 0;
            }
            header .container {
                flex-wrap: wrap;
            }
            .article-body h1 {
                font-size: 1.8rem;
            }
            .article-body h2 {
                font-size: 1.35rem;
            }
            .article-body h3 {
                font-size: 1.1rem;
            }
            .meta-info {
                flex-direction: column;
                gap: 6px;
            }
            .breadcrumb .container {
                font-size: 0.78rem;
            }
            .feedback-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 480px) {
            .my-logo {
                font-size: 1.2rem;
            }
            .my-logo small {
                font-size: 0.6rem;
            }
            .article-body h1 {
                font-size: 1.5rem;
            }
            .container {
                padding: 0 14px;
            }
            .sidebar-card {
                padding: 16px;
            }
            .feedback-section {
                padding: 18px 16px;
            }
        }
        .smooth-img {
            background: #e2e8f0;
            position: relative;
            overflow: hidden;
        }
        @media print {
            header,
            .breadcrumb,
            .sidebar,
            .feedback-section,
            footer {
                display: none;
            }
            .content-grid {
                display: block;
            }
            body {
                background: #fff;
            }
        }