:root {
            --primary: #c62828;
            --primary-dark: #8e1c1c;
            --dark: #1a1a2e;
            --gray: #f5f5f5;
            --text: #2d2d2d;
            --accent: #f9a825;
            --link: #1565c0;
            --radius: 8px;
            --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            color: var(--text);
            line-height: 1.7;
            background: #fff;
        }
        a {
            color: var(--link);
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: var(--primary);
            text-decoration: underline;
        }
        .site-header {
            background: linear-gradient(135deg, var(--dark) 0%, #16213e 100%);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
            flex-wrap: nowrap;
        }
        .my-logo {
            font-size: 1.5rem;
            font-weight: 900;
            color: #fff !important;
            text-decoration: none !important;
            letter-spacing: 0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
            white-space: nowrap;
        }
        .my-logo span {
            color: var(--accent);
        }
        .my-logo i {
            color: var(--accent);
            font-size: 1.3rem;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .main-nav a {
            color: rgba(255, 255, 255, 0.9);
            padding: 8px 14px;
            font-size: 0.9rem;
            font-weight: 500;
            border-radius: 4px;
            transition: background 0.2s, color 0.2s;
        }
        .main-nav a:hover {
            background: rgba(255, 255, 255, 0.1);
            color: var(--accent);
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.5rem;
            cursor: pointer;
            padding: 8px;
        }
        .breadcrumb {
            max-width: 1280px;
            margin: 0 auto;
            padding: 14px 20px;
            font-size: 0.85rem;
            color: #888;
            background: transparent;
        }
        .breadcrumb a {
            color: var(--primary);
        }
        .breadcrumb span {
            margin: 0 6px;
            color: #aaa;
        }
        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 20px;
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }
        .content-wrapper {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 30px;
        }
        .main-content {
            min-width: 0;
        }
        .sidebar {
            background: var(--gray);
            border-radius: var(--radius);
            padding: 20px;
            height: fit-content;
            position: sticky;
            top: 84px;
            box-shadow: var(--shadow);
        }
        h1 {
            font-size: 2.2rem;
            line-height: 1.2;
            color: var(--dark);
            margin-bottom: 16px;
            font-weight: 800;
            border-bottom: 3px solid var(--primary);
            padding-bottom: 12px;
        }
        h2 {
            font-size: 1.7rem;
            font-weight: 700;
            color: var(--dark);
            margin-top: 48px;
            margin-bottom: 16px;
            position: relative;
            padding-left: 14px;
            border-left: 4px solid var(--primary);
        }
        h3 {
            font-size: 1.25rem;
            font-weight: 600;
            color: var(--dark);
            margin-top: 28px;
            margin-bottom: 10px;
        }
        h4 {
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--primary);
            margin-top: 20px;
            margin-bottom: 8px;
        }
        p {
            margin-bottom: 14px;
        }
        ul,
        ol {
            margin-left: 24px;
            margin-bottom: 14px;
        }
        li {
            margin-bottom: 4px;
        }
        .data-table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0 30px;
            font-size: 0.9rem;
            background: #fff;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .data-table th {
            background: var(--dark);
            color: #fff;
            padding: 12px 16px;
            text-align: left;
            font-weight: 600;
        }
        .data-table td {
            padding: 10px 16px;
            border-bottom: 1px solid #eee;
        }
        .data-table tr:last-child td {
            border-bottom: none;
        }
        .data-table tr:hover {
            background: #f8f9fa;
        }
        .callout {
            background: linear-gradient(135deg, #fff8e1, #fff3cd);
            border-left: 4px solid var(--accent);
            padding: 16px 20px;
            border-radius: 0 var(--radius) var(--radius) 0;
            margin: 20px 0;
            font-size: 0.95rem;
        }
        .callout strong {
            color: var(--primary-dark);
        }
        .pro-tip {
            background: #e8f5e9;
            border-left: 4px solid #2e7d32;
            padding: 14px 18px;
            border-radius: 0 var(--radius) var(--radius) 0;
            margin: 20px 0;
        }
        figure {
            margin: 24px 0;
            text-align: center;
        }
        figure img {
            max-width: 100%;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            height: auto;
        }
        figcaption {
            font-size: 0.85rem;
            color: #777;
            margin-top: 8px;
            font-style: italic;
        }
        .search-section {
            background: var(--gray);
            padding: 20px;
            border-radius: var(--radius);
            margin: 20px 0;
            box-shadow: var(--shadow);
        }
        .search-section form {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }
        .search-section input[type="text"] {
            flex: 1;
            min-width: 200px;
            padding: 10px 14px;
            border: 2px solid #ddd;
            border-radius: var(--radius);
            font-size: 0.95rem;
            outline: none;
            transition: border-color 0.2s;
        }
        .search-section input[type="text"]:focus {
            border-color: var(--primary);
        }
        .search-section button {
            padding: 10px 20px;
            background: var(--primary);
            color: #fff;
            border: none;
            border-radius: var(--radius);
            font-size: 0.95rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
        }
        .search-section button:hover {
            background: var(--primary-dark);
        }
        .comment-section,
        .rating-section {
            background: var(--gray);
            padding: 20px;
            border-radius: var(--radius);
            margin: 20px 0;
            box-shadow: var(--shadow);
        }
        .comment-section textarea {
            width: 100%;
            padding: 12px;
            border: 2px solid #ddd;
            border-radius: var(--radius);
            font-size: 0.95rem;
            resize: vertical;
            min-height: 100px;
            outline: none;
            transition: border-color 0.2s;
        }
        .comment-section textarea:focus {
            border-color: var(--primary);
        }
        .comment-section input[type="text"] {
            width: 100%;
            padding: 10px 14px;
            border: 2px solid #ddd;
            border-radius: var(--radius);
            font-size: 0.95rem;
            margin-bottom: 10px;
            outline: none;
        }
        .comment-section button,
        .rating-section button {
            padding: 10px 20px;
            background: var(--primary);
            color: #fff;
            border: none;
            border-radius: var(--radius);
            font-size: 0.95rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
        }
        .comment-section button:hover,
        .rating-section button:hover {
            background: var(--primary-dark);
        }
        .rating-section .stars {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            display: flex;
            gap: 4px;
            margin-bottom: 10px;
        }
        .rating-section .stars i.active {
            color: var(--accent);
        }
        .site-footer {
            background: var(--dark);
            color: rgba(255, 255, 255, 0.8);
            padding: 30px 20px 20px;
            margin-top: 40px;
        }
        .footer-container {
            max-width: 1280px;
            margin: 0 auto;
        }
        .footer-copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.6);
        }
        friend-link {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            padding: 16px 0;
            font-size: 0.9rem;
        }
        friend-link a {
            color: rgba(255, 255, 255, 0.8);
            transition: color 0.2s;
        }
        friend-link a:hover {
            color: var(--accent);
            text-decoration: none;
        }
        @media (max-width: 900px) {
            .content-wrapper {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
                margin-top: 20px;
            }
        }
        @media (max-width: 768px) {
            .main-nav {
                display: none;
                position: absolute;
                top: 64px;
                left: 0;
                right: 0;
                background: var(--dark);
                flex-direction: column;
                padding: 10px;
                box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 12px 14px;
                width: 100%;
                text-align: center;
            }
            .hamburger {
                display: block;
            }
            .header-container {
                flex-wrap: nowrap;
            }
            h1 {
                font-size: 1.6rem;
            }
            h2 {
                font-size: 1.35rem;
            }
            h3 {
                font-size: 1.1rem;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 12px;
            }
            .breadcrumb {
                font-size: 0.75rem;
                padding: 10px 12px;
            }
            .data-table {
                font-size: 0.78rem;
            }
            .data-table th,
            .data-table td {
                padding: 8px 10px;
            }
        }
        @media print {
            .site-header,
            .site-footer,
            .sidebar,
            .search-section,
            .comment-section,
            .rating-section {
                display: none;
            }
            .content-wrapper {
                display: block;
            }
            body {
                color: #000;
            }
            h1 {
                border-bottom: 2px solid #000;
            }
            h2 {
                border-left: none;
            }
        }