*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        :root {
            --primary: #c62828;
            --primary-dark: #8e0000;
            --secondary: #ffb300;
            --accent: #1e1e2f;
            --bg: #f5f5f0;
            --bg-card: #ffffff;
            --text: #1a1a1a;
            --text-light: #555;
            --border: #ddd;
            --shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
            --radius: 12px;
            --max-width: 1200px;
            --font: 'Segoe UI', Roboto, system-ui, -apple-system, sans-serif;
            --transition: 0.25s ease;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            padding: 0 1rem;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover,
        a:focus-visible {
            color: var(--primary-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;
            width: 100%;
            flex: 1;
        }
        .site-header {
            background: var(--accent);
            color: #fff;
            border-radius: 0 0 var(--radius) var(--radius);
            padding: 0.75rem 1.5rem;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            position: relative;
            margin-bottom: 1.5rem;
        }
        .my-logo {
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--secondary);
            letter-spacing: -0.5px;
            text-transform: uppercase;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .my-logo i {
            font-size: 1.8rem;
            color: #fff;
        }
        .my-logo:hover {
            color: #fff;
            text-decoration: none;
        }
        .my-logo span {
            font-weight: 300;
            color: #ccc;
            font-size: 0.8rem;
            letter-spacing: 2px;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: 2px solid var(--secondary);
            color: var(--secondary);
            font-size: 1.5rem;
            padding: 0.3rem 0.7rem;
            border-radius: 6px;
            cursor: pointer;
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: rgba(255, 179, 0, 0.15);
        }
        .nav-menu {
            display: flex;
            flex-wrap: wrap;
            gap: 0.2rem;
            list-style: none;
            align-items: center;
        }
        .nav-menu li a {
            color: #eee;
            padding: 0.4rem 0.9rem;
            border-radius: 6px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: background var(--transition), color var(--transition);
            white-space: nowrap;
        }
        .nav-menu li a:hover,
        .nav-menu li a:focus-visible {
            background: var(--primary);
            color: #fff;
            text-decoration: none;
        }
        .nav-menu li a.active {
            background: var(--primary);
            color: #fff;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            gap: 0.4rem 0.8rem;
            font-size: 0.85rem;
            color: var(--text-light);
            margin-bottom: 1.2rem;
            padding: 0.5rem 0;
            list-style: none;
            align-items: center;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 0.6rem;
            color: #999;
            font-size: 1.1rem;
        }
        .breadcrumb a {
            color: var(--text-light);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb .current {
            color: var(--primary);
            font-weight: 600;
        }
        main {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 2rem 1.8rem;
            margin-bottom: 2rem;
        }
        h1 {
            font-size: 2.4rem;
            line-height: 1.2;
            color: var(--accent);
            margin-bottom: 0.75rem;
            border-left: 6px solid var(--secondary);
            padding-left: 1.2rem;
        }
        h2 {
            font-size: 1.8rem;
            margin: 2.2rem 0 1rem 0;
            color: var(--primary-dark);
            border-bottom: 2px solid var(--border);
            padding-bottom: 0.3rem;
        }
        h3 {
            font-size: 1.35rem;
            margin: 1.6rem 0 0.6rem 0;
            color: var(--accent);
        }
        h4 {
            font-size: 1.1rem;
            margin: 1rem 0 0.4rem 0;
            color: #333;
            font-weight: 600;
        }
        p {
            margin-bottom: 1.1rem;
        }
        .lead {
            font-size: 1.15rem;
            font-weight: 400;
            color: #2a2a2a;
            background: #f9f6f0;
            padding: 1.2rem 1.5rem;
            border-radius: 10px;
            border-left: 4px solid var(--secondary);
        }
        .update-time {
            display: inline-block;
            font-size: 0.85rem;
            color: var(--text-light);
            background: #f0efe9;
            padding: 0.2rem 1rem;
            border-radius: 20px;
            margin-bottom: 1rem;
        }
        .feature-img {
            margin: 1.5rem 0;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            background: #eee;
        }
        .feature-img figcaption {
            font-size: 0.85rem;
            color: var(--text-light);
            text-align: center;
            padding: 0.5rem 0 0;
        }
        .tier-mini {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
            gap: 0.8rem;
            margin: 1.2rem 0;
        }
        .tier-item {
            background: var(--accent);
            color: #fff;
            padding: 0.8rem 1rem;
            border-radius: 8px;
            text-align: center;
            font-weight: 600;
            font-size: 0.95rem;
        }
        .tier-item.s {
            background: #c62828;
        }
        .tier-item.a {
            background: #e65100;
        }
        .tier-item.b {
            background: #2e7d32;
        }
        .tier-item.c {
            background: #1565c0;
        }
        .tier-item.d {
            background: #6a1b9a;
        }
        blockquote {
            border-left: 5px solid var(--secondary);
            background: #f9f6f0;
            padding: 1rem 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 10px 10px 0;
            font-style: italic;
            color: #333;
        }
        blockquote cite {
            display: block;
            margin-top: 0.5rem;
            font-style: normal;
            font-weight: 600;
            color: var(--primary);
        }
        ul,
        ol {
            margin: 0.8rem 0 1.2rem 1.8rem;
        }
        li {
            margin-bottom: 0.4rem;
        }
        .search-box {
            background: #f0efe9;
            padding: 1.5rem;
            border-radius: var(--radius);
            margin: 2rem 0 1rem;
            display: flex;
            flex-wrap: wrap;
            gap: 0.8rem;
            align-items: center;
        }
        .search-box label {
            font-weight: 600;
            font-size: 1.05rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .search-box input[type="text"] {
            flex: 1;
            min-width: 180px;
            padding: 0.7rem 1rem;
            border: 2px solid var(--border);
            border-radius: 8px;
            font-size: 1rem;
            transition: border var(--transition);
            background: #fff;
        }
        .search-box input[type="text"]:focus {
            border-color: var(--primary);
            outline: none;
        }
        .search-box button {
            background: var(--primary);
            color: #fff;
            border: none;
            padding: 0.7rem 1.5rem;
            border-radius: 8px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background var(--transition);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .search-box button:hover {
            background: var(--primary-dark);
        }
        .feedback-section {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
            margin: 2rem 0 1rem;
        }
        .feedback-card {
            background: #f9f6f0;
            padding: 1.5rem;
            border-radius: var(--radius);
            border: 1px solid var(--border);
        }
        .feedback-card h3 {
            margin-top: 0;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .feedback-card form {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
            margin-top: 0.8rem;
        }
        .feedback-card input,
        .feedback-card textarea,
        .feedback-card select {
            padding: 0.6rem 0.9rem;
            border: 2px solid var(--border);
            border-radius: 8px;
            font-size: 0.95rem;
            font-family: var(--font);
            background: #fff;
            transition: border var(--transition);
        }
        .feedback-card input:focus,
        .feedback-card textarea:focus,
        .feedback-card select:focus {
            border-color: var(--primary);
            outline: none;
        }
        .feedback-card textarea {
            min-height: 80px;
            resize: vertical;
        }
        .feedback-card button {
            background: var(--accent);
            color: #fff;
            border: none;
            padding: 0.6rem 1.2rem;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: background var(--transition);
            align-self: flex-start;
        }
        .feedback-card button:hover {
            background: var(--primary);
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            gap: 0.3rem;
            justify-content: flex-end;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 1.6rem;
            color: #ccc;
            cursor: pointer;
            transition: color var(--transition);
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: var(--secondary);
        }
        .site-footer {
            background: var(--accent);
            color: #ddd;
            border-radius: var(--radius) var(--radius) 0 0;
            padding: 2rem 1.8rem 1.2rem;
            margin-top: 2rem;
        }
        .site-footer a {
            color: var(--secondary);
        }
        .site-footer a:hover {
            color: #fff;
        }
        friend-link {
            display: block;
            margin-bottom: 1.2rem;
        }
        friend-link a {
            display: inline-block;
            margin: 0.2rem 0.6rem 0.2rem 0;
            padding: 0.3rem 0.8rem;
            background: rgba(255, 255, 255, 0.07);
            border-radius: 6px;
            font-size: 0.9rem;
            transition: background var(--transition);
        }
        friend-link a:hover {
            background: rgba(255, 255, 255, 0.15);
            text-decoration: none;
        }
        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.15);
            padding-top: 1.2rem;
            font-size: 0.85rem;
            text-align: center;
            color: #aaa;
        }
        @media (max-width: 768px) {
            body {
                padding: 0 0.5rem;
            }
            .site-header {
                padding: 0.6rem 1rem;
            }
            .my-logo {
                font-size: 1.2rem;
            }
            .nav-toggle {
                display: block;
            }
            .nav-menu {
                display: none;
                flex-direction: column;
                width: 100%;
                background: rgba(0, 0, 0, 0.3);
                border-radius: 8px;
                padding: 0.8rem 0;
                margin-top: 0.5rem;
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-menu li a {
                padding: 0.6rem 1.2rem;
                white-space: normal;
            }
            main {
                padding: 1.2rem 1rem;
            }
            h1 {
                font-size: 1.7rem;
                padding-left: 0.8rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            h3 {
                font-size: 1.15rem;
            }
            .feedback-section {
                grid-template-columns: 1fr;
            }
            .search-box {
                flex-direction: column;
                align-items: stretch;
            }
            .search-box input[type="text"] {
                min-width: auto;
            }
            .tier-mini {
                grid-template-columns: repeat(2, 1fr);
            }
            .site-footer {
                padding: 1.5rem 1rem 1rem;
            }
        }
        @media (max-width: 480px) {
            .tier-mini {
                grid-template-columns: 1fr;
            }
            .breadcrumb {
                font-size: 0.75rem;
            }
        }
        .skip-link {
            position: absolute;
            top: -100%;
            left: 1rem;
            background: var(--primary);
            color: #fff;
            padding: 0.5rem 1rem;
            border-radius: 6px;
            z-index: 100;
            transition: top 0.2s;
        }
        .skip-link:focus {
            top: 0.5rem;
        }
        .data-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.2rem 0;
            font-size: 0.95rem;
        }
        .data-table th,
        .data-table td {
            border: 1px solid var(--border);
            padding: 0.6rem 0.8rem;
            text-align: left;
        }
        .data-table th {
            background: var(--accent);
            color: #fff;
            font-weight: 600;
        }
        .data-table tr:nth-child(even) {
            background: #f9f6f0;
        }
        .data-table tr:hover {
            background: #f0ece0;
        }
        .highlight {
            background: #fff8e0;
            padding: 0.1rem 0.3rem;
            border-radius: 4px;
        }
        .tag {
            display: inline-block;
            background: var(--primary);
            color: #fff;
            font-size: 0.7rem;
            padding: 0.15rem 0.6rem;
            border-radius: 20px;
            font-weight: 600;
            letter-spacing: 0.5px;
        }