*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        :root {
            --f1-red: #e10600;
            --f1-dark: #1a1a2e;
            --f1-grey: #2d2d44;
            --f1-light: #f5f5fa;
            --f1-accent: #ffd700;
            --f1-text: #1e1e2f;
            --f1-text-light: #6b6b80;
            --f1-white: #ffffff;
            --f1-border: #d0d0dd;
            --f1-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
            --f1-radius: 12px;
            --f1-transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-primary: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: var(--font-primary);
            color: var(--f1-text);
            background: var(--f1-light);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            color: var(--f1-red);
            text-decoration: none;
            transition: color var(--f1-transition);
        }
        a:hover,
        a:focus-visible {
            color: #b00500;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--f1-radius);
        }
        ul,
        ol {
            padding-left: 1.5rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.25rem;
        }
        .site-header {
            background: var(--f1-dark);
            color: var(--f1-white);
            padding: 0.75rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.15);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 0.75rem;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            color: var(--f1-white);
            background: var(--f1-red);
            padding: 0.2rem 1rem;
            border-radius: 6px;
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            transition: transform var(--f1-transition), background var(--f1-transition);
            text-decoration: none !important;
        }
        .my-logo i {
            font-size: 1.4rem;
        }
        .my-logo:hover {
            transform: scale(1.04);
            background: #c00500;
            text-decoration: none !important;
        }
        .my-logo span {
            font-weight: 300;
            opacity: 0.8;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: 2px solid var(--f1-white);
            color: var(--f1-white);
            font-size: 1.5rem;
            padding: 0.3rem 0.7rem;
            border-radius: 6px;
            cursor: pointer;
            transition: background var(--f1-transition);
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .primary-nav {
            display: flex;
            align-items: center;
            gap: 1.25rem;
            flex-wrap: wrap;
        }
        .primary-nav a {
            color: rgba(255, 255, 255, 0.85);
            font-weight: 500;
            font-size: 0.95rem;
            padding: 0.3rem 0.2rem;
            border-bottom: 2px solid transparent;
            transition: color var(--f1-transition), border-color var(--f1-transition);
            text-decoration: none;
        }
        .primary-nav a:hover,
        .primary-nav a:focus-visible {
            color: var(--f1-white);
            border-bottom-color: var(--f1-red);
            text-decoration: none;
        }
        .primary-nav a.active {
            color: var(--f1-white);
            border-bottom-color: var(--f1-red);
        }
        .breadcrumb {
            background: var(--f1-white);
            padding: 0.6rem 0;
            border-bottom: 1px solid var(--f1-border);
            font-size: 0.85rem;
        }
        .breadcrumb ul {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 0.4rem 0.6rem;
            padding: 0;
            margin: 0;
        }
        .breadcrumb li {
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .breadcrumb li+li::before {
            content: "/";
            color: var(--f1-text-light);
            font-weight: 300;
        }
        .breadcrumb a {
            color: var(--f1-text-light);
        }
        .breadcrumb a:hover {
            color: var(--f1-red);
        }
        .breadcrumb .current {
            color: var(--f1-text);
            font-weight: 600;
        }
        main {
            padding: 2.5rem 0 4rem;
        }
        article h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.2;
            color: var(--f1-dark);
            margin-bottom: 0.75rem;
            letter-spacing: -0.02em;
        }
        article h1 i {
            color: var(--f1-red);
            margin-right: 0.3rem;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 1.25rem;
            color: var(--f1-text-light);
            font-size: 0.9rem;
            margin-bottom: 2rem;
            padding-bottom: 1rem;
            border-bottom: 1px solid var(--f1-border);
        }
        .article-meta span {
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        h2 {
            font-size: 1.9rem;
            font-weight: 700;
            color: var(--f1-dark);
            margin-top: 3rem;
            margin-bottom: 1rem;
            line-height: 1.3;
            border-left: 5px solid var(--f1-red);
            padding-left: 1rem;
        }
        h2 i {
            color: var(--f1-red);
            margin-right: 0.4rem;
        }
        h3 {
            font-size: 1.4rem;
            font-weight: 600;
            color: var(--f1-grey);
            margin-top: 2.2rem;
            margin-bottom: 0.75rem;
            line-height: 1.3;
        }
        h3 i {
            color: var(--f1-accent);
            margin-right: 0.3rem;
        }
        h4 {
            font-size: 1.15rem;
            font-weight: 600;
            color: var(--f1-dark);
            margin-top: 1.6rem;
            margin-bottom: 0.5rem;
        }
        p {
            margin-bottom: 1.2rem;
            font-size: 1.05rem;
        }
        .lead {
            font-size: 1.2rem;
            font-weight: 400;
            color: var(--f1-grey);
            background: var(--f1-white);
            padding: 1.5rem 2rem;
            border-radius: var(--f1-radius);
            box-shadow: var(--f1-shadow);
            border-left: 4px solid var(--f1-red);
            margin-bottom: 2rem;
        }
        .highlight-box {
            background: var(--f1-white);
            padding: 1.5rem 2rem;
            border-radius: var(--f1-radius);
            box-shadow: var(--f1-shadow);
            border-left: 4px solid var(--f1-accent);
            margin: 1.8rem 0;
        }
        .highlight-box strong {
            color: var(--f1-red);
        }
        .feature-list {
            list-style: none;
            padding: 0;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 0.8rem 1.5rem;
            margin: 1.2rem 0;
        }
        .feature-list li {
            display: flex;
            align-items: flex-start;
            gap: 0.6rem;
            background: var(--f1-white);
            padding: 0.8rem 1rem;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
        }
        .feature-list li i {
            color: var(--f1-red);
            font-size: 1.1rem;
            margin-top: 0.15rem;
        }
        .feature-list li strong {
            color: var(--f1-dark);
        }
        @media (max-width: 640px) {
            .feature-list {
                grid-template-columns: 1fr;
            }
        }
        .featured-image {
            margin: 2rem 0;
            border-radius: var(--f1-radius);
            overflow: hidden;
            box-shadow: var(--f1-shadow);
        }
        .featured-image img {
            width: 100%;
            height: auto;
            object-fit: cover;
        }
        .featured-image figcaption {
            background: var(--f1-white);
            padding: 0.75rem 1.25rem;
            font-size: 0.9rem;
            color: var(--f1-text-light);
            border-top: 1px solid var(--f1-border);
        }
        .related-links {
            background: var(--f1-white);
            padding: 1.5rem 2rem;
            border-radius: var(--f1-radius);
            box-shadow: var(--f1-shadow);
            margin: 2rem 0;
        }
        .related-links h4 {
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .related-links ul {
            list-style: none;
            padding: 0;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 0.5rem 1.5rem;
        }
        .related-links li a {
            display: flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.3rem 0;
        }
        .related-links li a i {
            font-size: 0.8rem;
            color: var(--f1-red);
        }
        @media (max-width: 640px) {
            .related-links ul {
                grid-template-columns: 1fr;
            }
        }
        .interactive-section {
            background: var(--f1-white);
            padding: 2rem 2.5rem;
            border-radius: var(--f1-radius);
            box-shadow: var(--f1-shadow);
            margin: 2.5rem 0;
        }
        .interactive-section h3 {
            margin-top: 0;
        }
        .search-form {
            display: flex;
            gap: 0.75rem;
            flex-wrap: wrap;
            margin-top: 0.5rem;
        }
        .search-form input[type="text"] {
            flex: 1;
            min-width: 200px;
            padding: 0.75rem 1.2rem;
            border: 2px solid var(--f1-border);
            border-radius: 8px;
            font-size: 1rem;
            transition: border-color var(--f1-transition);
            background: var(--f1-light);
        }
        .search-form input[type="text"]:focus {
            outline: none;
            border-color: var(--f1-red);
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.75rem 1.6rem;
            border: none;
            border-radius: 8px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background var(--f1-transition), transform var(--f1-transition);
            background: var(--f1-red);
            color: var(--f1-white);
            text-decoration: none;
        }
        .btn:hover {
            background: #b00500;
            transform: translateY(-2px);
            text-decoration: none;
            color: var(--f1-white);
        }
        .btn-secondary {
            background: var(--f1-dark);
        }
        .btn-secondary:hover {
            background: #2d2d44;
        }
        .btn-outline {
            background: transparent;
            border: 2px solid var(--f1-red);
            color: var(--f1-red);
        }
        .btn-outline:hover {
            background: var(--f1-red);
            color: var(--f1-white);
        }
        .comment-form textarea {
            width: 100%;
            padding: 0.75rem 1.2rem;
            border: 2px solid var(--f1-border);
            border-radius: 8px;
            font-size: 1rem;
            font-family: var(--font-primary);
            resize: vertical;
            min-height: 120px;
            transition: border-color var(--f1-transition);
            background: var(--f1-light);
        }
        .comment-form textarea:focus {
            outline: none;
            border-color: var(--f1-red);
        }
        .comment-form .form-row {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
            margin-top: 0.75rem;
        }
        .comment-form .form-row input {
            flex: 1;
            min-width: 180px;
            padding: 0.75rem 1.2rem;
            border: 2px solid var(--f1-border);
            border-radius: 8px;
            font-size: 1rem;
            background: var(--f1-light);
            transition: border-color var(--f1-transition);
        }
        .comment-form .form-row input:focus {
            outline: none;
            border-color: var(--f1-red);
        }
        .score-group {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            align-items: center;
            margin: 1rem 0;
        }
        .score-group label {
            font-weight: 600;
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            gap: 0.2rem;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 1.8rem;
            color: var(--f1-border);
            cursor: pointer;
            transition: color var(--f1-transition);
        }
        .star-rating input:checked~label,
        .star-rating label:hover,
        .star-rating label:hover~label {
            color: var(--f1-accent);
        }
        .site-footer {
            background: var(--f1-dark);
            color: rgba(255, 255, 255, 0.8);
            padding: 2.5rem 0 1.5rem;
            margin-top: 2rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-grid h4 {
            color: var(--f1-white);
            font-size: 1.1rem;
            margin-bottom: 0.8rem;
            margin-top: 0;
        }
        .footer-grid p {
            font-size: 0.95rem;
            color: rgba(255, 255, 255, 0.7);
        }
        .footer-grid a {
            color: rgba(255, 255, 255, 0.7);
            display: block;
            padding: 0.2rem 0;
            font-size: 0.95rem;
        }
        .footer-grid a:hover {
            color: var(--f1-white);
        }
        friend-link {
            display: block;
            grid-column: 1 / -1;
            background: rgba(255, 255, 255, 0.05);
            padding: 1.2rem 1.5rem;
            border-radius: 8px;
            margin-top: 0.5rem;
            font-size: 0.95rem;
        }
        friend-link a {
            display: inline-block;
            margin: 0.2rem 0.8rem 0.2rem 0;
            color: var(--f1-accent);
        }
        friend-link a:hover {
            color: #ffe44d;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 1.2rem;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 0.5rem;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            friend-link {
                grid-column: 1;
            }
        }
        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            .primary-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: flex-start;
                gap: 0.5rem;
                padding: 1rem 0 0.5rem;
                border-top: 1px solid rgba(255, 255, 255, 0.1);
                margin-top: 0.75rem;
            }
            .primary-nav.open {
                display: flex;
            }
            .primary-nav a {
                width: 100%;
                padding: 0.5rem 0;
                border-bottom: none;
                border-left: 3px solid transparent;
                padding-left: 0.5rem;
            }
            .primary-nav a:hover,
            .primary-nav a.active {
                border-left-color: var(--f1-red);
                border-bottom: none;
            }
            article h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            h3 {
                font-size: 1.2rem;
            }
            .lead {
                font-size: 1.05rem;
                padding: 1.2rem 1.2rem;
            }
            .interactive-section {
                padding: 1.5rem 1.2rem;
            }
            .search-form {
                flex-direction: column;
            }
            .comment-form .form-row {
                flex-direction: column;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 0.9rem;
            }
            article h1 {
                font-size: 1.5rem;
            }
            h2 {
                font-size: 1.3rem;
                padding-left: 0.7rem;
            }
            .my-logo {
                font-size: 1.4rem;
                padding: 0.15rem 0.7rem;
            }
            .feature-list li {
                font-size: 0.95rem;
            }
        }
        .text-muted {
            color: var(--f1-text-light);
        }
        .mt-1 {
            margin-top: 1rem;
        }
        .mt-2 {
            margin-top: 2rem;
        }
        .mb-1 {
            margin-bottom: 1rem;
        }
        .mb-2 {
            margin-bottom: 2rem;
        }
        .flex {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            flex-wrap: wrap;
        }
        @media print {
            .site-header {
                position: static;
                box-shadow: none;
            }
            .nav-toggle,
            .primary-nav {
                display: none !important;
            }
            .interactive-section {
                break-inside: avoid;
            }
            .site-footer {
                break-inside: avoid;
            }
        }