*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; font-size: 16px; }
        body { font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; line-height: 1.7; color: #1a1a2e; background: #f5f5f7; }
        :root {
            --f1-red: #e10600;
            --f1-dark: #15151e;
            --f1-grey: #2b2b3a;
            --f1-light: #f8f9fa;
            --f1-white: #ffffff;
            --f1-accent: #00d2be;
            --f1-warning: #ffb800;
            --text-primary: #1a1a2e;
            --text-secondary: #5a5a6e;
            --border-color: #e9ecef;
        }
        h1, h2, h3, h4, h5 { font-weight: 700; line-height: 1.3; color: var(--f1-dark); margin-bottom: 0.5em; }
        h1 { font-size: 2.3rem; margin-top: 0; }
        h2 { font-size: 1.8rem; margin-top: 2.5rem; border-left: 5px solid var(--f1-red); padding-left: 1rem; }
        h3 { font-size: 1.3rem; margin-top: 1.8rem; }
        h4 { font-size: 1.1rem; margin-top: 1.2rem; color: var(--f1-grey); }
        p { margin-bottom: 1.2rem; }
        a { color: var(--f1-red); text-decoration: none; transition: all 0.3s ease; }
        a:hover { color: #b00500; text-decoration: underline; }
        ul, ol { margin-left: 1.8rem; margin-bottom: 1.2rem; }
        li { margin-bottom: 0.4rem; }
        img { max-width: 100%; height: auto; border-radius: 8px; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 1rem; }
        .text-muted { color: var(--text-secondary); }
        .text-small { font-size: 0.875rem; }
        .site-header { background: var(--f1-dark); padding: 0.8rem 0; position: sticky; top: 0; z-index: 100; box-shadow: 0 2px 15px rgba(0,0,0,0.3); }
        .header-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; }
        .my-logo { font-size: 1.8rem; font-weight: 900; color: var(--f1-white); text-decoration: none; letter-spacing: -0.5px; }
        .my-logo span { color: var(--f1-red); }
        .my-logo:hover { color: var(--f1-white); text-decoration: none; }
        .nav-toggle { display: none; background: none; border: 2px solid rgba(255,255,255,0.6); color: white; font-size: 1.2rem; padding: 0.5rem 0.8rem; border-radius: 6px; cursor: pointer; }
        .main-nav ul { display: flex; list-style: none; margin: 0; padding: 0; }
        .main-nav li { margin: 0 0.2rem; }
        .main-nav a { color: rgba(255,255,255,0.85); padding: 0.5rem 0.8rem; border-radius: 4px; font-weight: 500; font-size: 0.9rem; }
        .main-nav a:hover { color: white; background: var(--f1-red); text-decoration: none; }
        .breadcrumb { background: var(--f1-light); padding: 0.6rem 0; border-bottom: 1px solid var(--border-color); font-size: 0.85rem; }
        .breadcrumb a { color: var(--text-secondary); }
        .breadcrumb a:hover { color: var(--f1-red); }
        .breadcrumb .separator { margin: 0 0.5rem; color: #adb5bd; }
        .breadcrumb .current { color: var(--f1-dark); font-weight: 600; }
        .hero { background: linear-gradient(135deg, var(--f1-dark) 0%, #2b2b3a 60%, var(--f1-red) 100%); color: white; padding: 3rem 0; text-align: center; }
        .hero h1 { color: white; font-size: 2.5rem; max-width: 800px; margin: 0 auto 0.8rem; }
        .hero p { font-size: 1.1rem; max-width: 700px; margin: 0 auto 1.5rem; color: rgba(255,255,255,0.85); }
        .hero .hero-badge { display: inline-block; background: var(--f1-red); padding: 0.3rem 1rem; border-radius: 30px; font-size: 0.8rem; letter-spacing: 1px; text-transform: uppercase; }
        .content-layout { display: grid; grid-template-columns: 1fr 280px; gap: 2rem; padding: 2rem 0; }
        .main-content { min-width: 0; }
        .sidebar { position: sticky; top: 100px; align-self: start; background: white; border-radius: 12px; padding: 1.5rem; box-shadow: 0 4px 20px rgba(0,0,0,0.06); }
        @media (max-width: 992px) {
            .content-layout { grid-template-columns: 1fr; }
            .sidebar { position: static; margin-bottom: 2rem; }
        }
        .card { background: white; border-radius: 12px; padding: 1.8rem; margin-bottom: 1.5rem; box-shadow: 0 2px 15px rgba(0,0,0,0.05); }
        .feature-card { border-left: 4px solid var(--f1-red); }
        .grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
        @media (max-width: 768px) {
            .grid-2, .grid-3 { grid-template-columns: 1fr; }
        }
        .table-wrap { overflow-x: auto; margin: 1.5rem 0; }
        table { width: 100%; border-collapse: collapse; margin: 1rem 0; }
        th, td { padding: 0.75rem 1rem; text-align: left; border-bottom: 1px solid var(--border-color); }
        th { background: var(--f1-dark); color: white; font-weight: 600; }
        tr:hover td { background: #f8f9fa; }
        .search-box { display: flex; gap: 0.5rem; margin: 1.5rem 0; }
        .search-box input, .comment-box textarea, .score-box input {
            flex: 1; padding: 0.8rem 1rem; border: 2px solid var(--border-color); border-radius: 8px; font-size: 1rem; transition: border-color 0.3s;
        }
        .search-box input:focus, .comment-box textarea:focus { border-color: var(--f1-red); outline: none; }
        .btn { background: var(--f1-red); color: white; border: none; padding: 0.7rem 1.5rem; border-radius: 8px; font-weight: 600; cursor: pointer; transition: all 0.3s; display: inline-flex; align-items: center; gap: 0.5rem; }
        .btn:hover { background: #b00500; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(225,6,0,0.3); }
        .btn-primary { background: var(--f1-dark); }
        .btn-primary:hover { background: var(--f1-red); }
        .comment-item { background: var(--f1-light); border-radius: 10px; padding: 1rem 1.2rem; margin-bottom: 1rem; border-left: 3px solid var(--f1-accent); }
        .comment-meta { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 0.4rem; }
        .star-rating { display: flex; gap: 0.2rem; color: var(--f1-warning); margin-bottom: 0.5rem; }
        .score-display { font-size: 2rem; font-weight: 900; color: var(--f1-dark); }
        .callout { background: linear-gradient(135deg, #fff5f5, #ffe8e8); border-left: 6px solid var(--f1-red); padding: 1.5rem; border-radius: 0 12px 12px 0; margin: 2rem 0; }
        .callout p:last-child { margin-bottom: 0; }
        .site-footer { background: var(--f1-dark); color: rgba(255,255,255,0.8); padding: 2.5rem 0 1rem; margin-top: 3rem; }
        .footer-content { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 2rem; margin-bottom: 2rem; }
        @media (max-width: 768px) { .footer-content { grid-template-columns: 1fr; } }
        .footer-content h4 { color: white; font-size: 1rem; margin-bottom: 1rem; }
        .footer-content ul { list-style: none; margin: 0; padding: 0; }
        .footer-content ul li { margin-bottom: 0.5rem; }
        .footer-content ul a { color: rgba(255,255,255,0.7); font-size: 0.9rem; }
        .footer-content ul a:hover { color: var(--f1-red); text-decoration: none; }
        .copyright { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 1.5rem; text-align: center; font-size: 0.85rem; color: rgba(255,255,255,0.5); }
        .copyright a { color: rgba(255,255,255,0.7); }
        friend-link { display: block; margin-top: 1.5rem; padding: 1.2rem; background: rgba(255,255,255,0.05); border-radius: 8px; }
        friend-link a { display: inline-block; margin-right: 1rem; color: var(--f1-accent); font-size: 0.9rem; }
        @media (max-width: 768px) {
            .nav-toggle { display: block; }
            .main-nav { display: none; width: 100%; margin-top: 0.8rem; }
            .main-nav.open { display: block; }
            .main-nav ul { flex-direction: column; }
            .main-nav li { margin: 0.2rem 0; }
            .main-nav a { display: block; padding: 0.6rem 1rem; }
            h1 { font-size: 1.8rem; }
            .hero h1 { font-size: 1.6rem; }
            .hero p { font-size: 1rem; }
            .site-header .header-inner { flex-wrap: wrap; }
        }
        @media (max-width: 480px) {
            h2 { font-size: 1.4rem; }
            .card { padding: 1.2rem; }
            .btn { padding: 0.6rem 1rem; font-size: 0.9rem; }
        }
        @media print {
            .site-header, .site-footer, .sidebar, .breadcrumb { display: none; }
            body { background: white; }
            .container { max-width: 100%; }
        }
        .back-to-top { position: fixed; bottom: 20px; right: 20px; background: var(--f1-red); color: white; width: 45px; height: 45px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.2rem; box-shadow: 0 4px 15px rgba(0,0,0,0.3); z-index: 99; transition: all 0.3s; border: none; cursor: pointer; }
        .back-to-top:hover { transform: translateY(-3px); background: #b00500; }