*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        :root {
            --primary: #0b4fae;
            --secondary: #f90;
            --bg: #f2f7fc;
            --card: #fff;
            --text: #222;
            --dark: #0a1e3c;
            --success: #0a7a2f;
            --radius: 16px;
            --shadow: 0 8px 30px rgba(0, 0, 0, .08);
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Inter', system-ui, -apple-system, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.75;
            font-size: 17px;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: .25s;
        }
        a:hover {
            color: var(--secondary);
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            border-radius: 12px;
        }
        .container {
            width: min(1200px, 94%);
            margin-inline: auto;
        }
        .site-header {
            background: linear-gradient(135deg, var(--dark), #123c75);
            padding: 18px 0;
            position: sticky;
            top: 0;
            z-index: 999;
            box-shadow: 0 6px 18px rgba(0, 0, 0, .15);
        }
        .header-wrap {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 1.55rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.5px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .my-logo i {
            color: var(--secondary);
        }
        .my-logo:hover {
            color: #ffeebb;
            text-decoration: none;
        }
        .nav-links {
            display: flex;
            gap: 6px;
            align-items: center;
            flex-wrap: wrap;
        }
        .nav-links a {
            color: #e7f0ff;
            font-weight: 600;
            padding: 8px 14px;
            border-radius: 50px;
            font-size: .9rem;
        }
        .nav-links a:hover {
            background: rgba(255, 255, 255, .15);
            color: #fff;
            text-decoration: none;
            transform: translateY(-1px);
        }
        .search-icon-btn {
            background: rgba(255, 255, 255, .1);
            border: 0;
            color: #fff;
            font-size: 1.1rem;
            padding: 8px 14px;
            border-radius: 50px;
            cursor: pointer;
        }
        .hamburger {
            display: none;
            background: transparent;
            border: 0;
            color: #fff;
            font-size: 1.6rem;
            cursor: pointer;
        }
        .breadcrumb-wrap {
            background: #e9f0fa;
            font-size: .9rem;
            padding: 12px 0;
            border-bottom: 1px solid #d9e4f0;
        }
        .breadcrumb-wrap ol {
            list-style: none;
            display: flex;
            gap: 6px;
            flex-wrap: wrap;
        }
        .breadcrumb-wrap li+li::before {
            content: "/";
            margin-right: 8px;
            color: #8496aa;
        }
        .breadcrumb-wrap a {
            color: var(--primary);
        }
        .breadcrumb-wrap li[aria-current="page"] {
            color: #555;
        }
        .article-hero {
            padding: 40px 0 30px;
        }
        .article-hero .lead {
            font-size: 1.2rem;
            color: #333c4a;
            margin-top: 12px;
        }
        .title-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin: 20px 0 30px;
            align-items: center;
            font-size: .9rem;
            color: #5f6c7d;
        }
        .title-meta .badge {
            background: var(--secondary);
            color: #222;
            padding: 4px 14px;
            border-radius: 40px;
            font-weight: 700;
            font-size: .8rem;
        }
        .featured-img {
            width: 100%;
            border-radius: 20px;
            box-shadow: var(--shadow);
            margin: 30px 0 20px;
            object-fit: cover;
            max-height: 480px;
        }
        .img-caption {
            font-size: .9rem;
            color: #54657a;
            text-align: center;
            margin-bottom: 30px;
        }
        .layout {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            margin: 20px 0 40px;
        }
        .article-content {
            background: var(--card);
            padding: 30px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        .sidebar {
            background: var(--card);
            border-radius: var(--radius);
            padding: 24px;
            box-shadow: var(--shadow);
            height: fit-content;
            position: sticky;
            top: 100px;
        }
        .section-card {
            margin-bottom: 28px;
            border-left: 4px solid var(--secondary);
        }
        h1,
        h2,
        h3,
        h4,
        h5 {
            line-height: 1.35;
            font-weight: 800;
            color: var(--dark);
            margin: 28px 0 14px;
        }
        h1 {
            font-size: clamp(1.9rem, 4vw, 2.8rem);
        }
        h2 {
            font-size: clamp(1.4rem, 3vw, 1.9rem);
            border-bottom: 2px solid #dbe6f2;
            padding-bottom: 8px;
            margin-top: 46px;
        }
        h3 {
            font-size: 1.22rem;
            font-weight: 700;
        }
        h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: #133561;
        }
        p {
            margin-bottom: 18px;
        }
        ul,
        ol {
            margin: 0 0 22px 20px;
        }
        li {
            margin-bottom: 8px;
        }
        blockquote {
            border-left: 6px solid var(--secondary);
            background: #fff8ec;
            padding: 20px 24px;
            border-radius: 0 14px 14px 0;
            margin: 24px 0;
            font-style: italic;
            font-size: 1.05rem;
        }
        .tdk-table,
        .compare-table {
            width: 100%;
            border-collapse: collapse;
            margin: 24px 0;
            font-size: .98rem;
            box-shadow: 0 2px 12px rgba(0, 0, 0, .05);
        }
        .tdk-table th,
        .tdk-table td,
        .compare-table th,
        .compare-table td {
            border: 1px solid #dee7f0;
            padding: 12px 16px;
            text-align: left;
        }
        .tdk-table th,
        .compare-table th {
            background: #f0f6fc;
            font-weight: 700;
        }
        .compare-table tr:nth-child(even),
        .tdk-table tr:nth-child(even) {
            background: #fbfdff;
        }
        .widget-box {
            background: #f5faff;
            border: 1px solid #dcebfa;
            border-radius: 16px;
            padding: 24px;
            margin: 26px 0;
        }
        .rating-stars {
            color: var(--secondary);
            font-size: 1.2rem;
        }
        .btn {
            display: inline-block;
            background: var(--primary);
            color: #fff;
            font-weight: 700;
            padding: 12px 24px;
            border-radius: 60px;
            border: 0;
            cursor: pointer;
            transition: .3s;
        }
        .btn:hover {
            background: #0a3a75;
            transform: translateY(-2px);
            color: #fff;
            text-decoration: none;
        }
        .btn-orange {
            background: var(--secondary);
            color: #1a1a2e;
        }
        .btn-orange:hover {
            background: #dd8700;
            color: #fff;
        }
        input,
        textarea,
        select {
            width: 100%;
            padding: 13px 15px;
            border-radius: 12px;
            border: 1px solid #bfd0e1;
            font-size: 1rem;
            background: #fff;
            margin-bottom: 14px;
        }
        textarea {
            min-height: 90px;
            resize: vertical;
        }
        label {
            font-weight: 600;
            font-size: .9rem;
            margin-bottom: 6px;
            display: block;
        }
        .site-footer {
            background: var(--dark);
            color: #c0d1e5;
            padding: 40px 0 20px;
            margin-top: 60px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 30px;
        }
        .site-footer .my-logo {
            color: #fff;
            font-size: 1.4rem;
        }
        .site-footer a {
            color: #bcd2ef;
        }
        friend-link {
            display: block;
            background: rgba(255, 255, 255, .05);
            border-left: 4px solid var(--secondary);
            padding: 18px 22px;
            margin: 20px 0;
            font-size: .95rem;
            line-height: 2;
        }
        .copyright {
            text-align: center;
            border-top: 1px solid rgba(255, 255, 255, .15);
            padding-top: 22px;
            font-size: .88rem;
            color: #9fb3c8;
        }
        .back2top {
            position: fixed;
            right: 15px;
            bottom: 20px;
            background: var(--primary);
            border-radius: 60px;
            width: 44px;
            height: 44px;
            display: grid;
            place-items: center;
            color: #fff;
            border: 0;
            font-size: 1.2rem;
            box-shadow: 0 6px 20px rgba(11, 79, 174, .4);
            z-index: 999;
            cursor: pointer;
        }
        @media (max-width: 992px) {
            .layout {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #0a2a5c;
                padding: 10px;
                border-radius: 16px;
            }
            .nav-links.show {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 576px) {
            body {
                font-size: 16px;
            }
            .article-content,
            .sidebar {
                padding: 18px;
            }
            .header-wrap {
                padding: 10px 0;
            }
        }