*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        :root {
            --primary: #E2231A;
            --primary-dark: #b01810;
            --accent: #00A2FF;
            --bg: #f4f6f9;
            --card: #ffffff;
            --text: #212529;
            --text-light: #6c757d;
            --border: #e9ecef;
            --radius: 12px;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.07);
            --header-bg: #101820;
            --footer-bg: #101820;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.75;
        }
        a {
            color: var(--accent);
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: var(--primary);
        }
        img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius);
        }
        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: var(--header-bg);
            color: #fff;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding: 14px 20px;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 900;
            letter-spacing: 2px;
            text-transform: uppercase;
            background: linear-gradient(135deg, var(--primary), #ff6b6b);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-decoration: none;
        }
        .my-logo:hover {
            opacity: 0.85;
        }
        .main-nav {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            align-items: center;
        }
        .main-nav a {
            color: #e0e0e0;
            padding: 8px 16px;
            border-radius: 30px;
            font-size: 0.95rem;
            font-weight: 500;
            transition: all 0.2s;
            border: 1px solid transparent;
        }
        .main-nav a:hover {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            border-color: rgba(255, 255, 255, 0.2);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 4px 10px;
            line-height: 1;
            border-radius: 8px;
        }
        .hamburger:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .breadcrumb {
            background: rgba(255, 255, 255, 0.06);
            padding: 10px 20px;
            font-size: 0.85rem;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }
        .breadcrumb a {
            color: #bbb;
        }
        .breadcrumb a:hover {
            color: #fff;
        }
        .breadcrumb .sep {
            margin: 0 8px;
            color: #777;
        }
        .hero {
            background: linear-gradient(135deg, #101820 0%, #1a2a3a 60%, #222 100%);
            color: #fff;
            padding: 60px 20px 40px;
            text-align: center;
            border-bottom: 4px solid var(--primary);
        }
        .hero h1 {
            font-size: clamp(1.8rem, 4vw, 3rem);
            font-weight: 800;
            margin-bottom: 12px;
        }
        .hero p {
            font-size: 1.1rem;
            color: #cfd8dc;
            max-width: 720px;
            margin: 0 auto;
        }
        .hero .meta-badge {
            display: inline-block;
            margin-top: 20px;
            background: rgba(255, 255, 255, 0.1);
            padding: 8px 20px;
            border-radius: 30px;
            font-size: 0.9rem;
        }
        .layout {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            padding: 40px 0;
        }
        @media (max-width: 992px) {
            .layout {
                grid-template-columns: 1fr;
            }
        }
        .article-card {
            background: var(--card);
            border-radius: var(--radius);
            padding: 40px;
            box-shadow: var(--shadow);
        }
        @media (max-width: 576px) {
            .article-card {
                padding: 20px;
            }
        }
        .article-card h2 {
            font-size: 1.75rem;
            margin: 40px 0 16px;
            color: #111;
            border-left: 4px solid var(--primary);
            padding-left: 16px;
            line-height: 1.3;
        }
        .article-card h3 {
            font-size: 1.3rem;
            margin: 28px 0 12px;
            color: #222;
        }
        .article-card h4 {
            font-size: 1.1rem;
            margin: 20px 0 8px;
            color: #333;
            font-weight: 600;
        }
        .article-card p {
            margin-bottom: 16px;
            color: #444;
        }
        .article-card ul,
        .article-card ol {
            margin: 0 0 20px 24px;
            color: #444;
        }
        .article-card li {
            margin-bottom: 6px;
        }
        .highlight-box {
            background: #eef7ff;
            border-left: 4px solid var(--accent);
            padding: 18px 20px;
            border-radius: 8px;
            margin: 20px 0;
        }
        .tip-box {
            background: #fff9e6;
            border-left: 4px solid #f0ad4e;
            padding: 18px 20px;
            border-radius: 8px;
            margin: 20px 0;
        }
        .table-wrap {
            overflow-x: auto;
            margin: 20px 0;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.95rem;
        }
        th,
        td {
            border: 1px solid var(--border);
            padding: 12px;
            text-align: left;
        }
        th {
            background: #f8f9fa;
            font-weight: 600;
        }
        .img-caption {
            font-size: 0.85rem;
            color: var(--text-light);
            text-align: center;
            margin-top: 8px;
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }
        .widget {
            background: var(--card);
            border-radius: var(--radius);
            padding: 24px;
            box-shadow: var(--shadow);
        }
        .widget h3 {
            font-size: 1.1rem;
            margin-bottom: 12px;
            color: #111;
            border-bottom: 2px solid var(--primary);
            padding-bottom: 6px;
        }
        .widget ul {
            list-style: none;
        }
        .widget li {
            margin-bottom: 8px;
        }
        .widget li a {
            color: #444;
        }
        .widget li a:hover {
            color: var(--primary);
        }
        .form-group {
            margin-bottom: 16px;
        }
        .form-group label {
            display: block;
            font-weight: 600;
            margin-bottom: 6px;
            font-size: 0.9rem;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 10px 14px;
            border: 1px solid var(--border);
            border-radius: 8px;
            font-size: 0.95rem;
            font-family: inherit;
            background: #f8f9fa;
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            outline: none;
            border-color: var(--accent);
            background: #fff;
        }
        .btn {
            display: inline-block;
            background: var(--primary);
            color: #fff !important;
            padding: 10px 24px;
            border: none;
            border-radius: 30px;
            font-size: 0.95rem;
            cursor: pointer;
            transition: background 0.2s;
            font-weight: 600;
        }
        .btn:hover {
            background: var(--primary-dark);
        }
        .btn-block {
            width: 100%;
            text-align: center;
        }
        .star-rating {
            display: flex;
            gap: 4px;
            font-size: 1.4rem;
            cursor: pointer;
            margin-bottom: 8px;
        }
        .star-rating .star {
            color: #ccc;
            transition: color 0.2s;
        }
        .star-rating .star.active {
            color: #ffc107;
        }
        .site-footer {
            background: var(--footer-bg);
            color: #aaa;
            padding: 40px 20px 20px;
            margin-top: 60px;
        }
        .footer-inner {
            max-width: 1280px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 30px;
        }
        .site-footer h3 {
            color: #fff;
            margin-bottom: 10px;
            font-size: 1rem;
        }
        .site-footer a {
            color: #aaa;
        }
        .site-footer a:hover {
            color: #fff;
        }
        friend-link {
            display: block;
            border-top: 1px solid #222;
            padding: 16px 0;
            font-size: 0.85rem;
        }
        .copyright {
            text-align: center;
            padding-top: 16px;
            border-top: 1px solid #222;
            font-size: 0.85rem;
            color: #777;
        }
        @media (max-width: 768px) {
            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                gap: 4px;
                padding: 12px 0;
            }
            .main-nav.open {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            .header-inner {
                flex-wrap: wrap;
            }
            .article-card {
                padding: 20px;
            }
        }
        @media (min-width: 769px) {
            .main-nav {
                display: flex !important;
            }
        }
        .back-to-top {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: var(--primary);
            color: #fff;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 16px rgba(226, 35, 26, 0.4);
            transition: background 0.2s;
            z-index: 999;
        }
        .back-to-top:hover {
            background: var(--primary-dark);
        }