*,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary: #1a2a3a;
            --secondary: #e63946;
            --accent: #f1c40f;
            --bg: #f8f9fa;
            --text: #222;
            --light: #ffffff;
            --gray: #6c757d;
            --border: #dee2e6;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            --radius: 12px;
            --transition: 0.3s ease;
            --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: var(--secondary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: #b71c1c;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius);
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: var(--primary);
            color: var(--light);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 20px;
            max-width: 1200px;
            margin: 0 auto;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: var(--light);
            background: linear-gradient(135deg, var(--accent), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-decoration: none;
            transition: transform var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .my-logo:hover {
            transform: scale(1.02);
            text-decoration: none;
            -webkit-text-fill-color: transparent;
        }
        .my-logo i {
            -webkit-text-fill-color: var(--accent);
            font-size: 1.6rem;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--light);
            font-size: 1.6rem;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 6px;
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 24px;
            flex-wrap: wrap;
        }
        .main-nav a {
            color: rgba(255, 255, 255, 0.88);
            font-weight: 500;
            font-size: 0.95rem;
            padding: 6px 0;
            border-bottom: 2px solid transparent;
            transition: all var(--transition);
        }
        .main-nav a:hover {
            color: var(--accent);
            border-bottom-color: var(--accent);
            text-decoration: none;
        }
        .main-nav a i {
            margin-right: 6px;
            font-size: 0.85rem;
        }
        .breadcrumb-wrap {
            background: var(--light);
            border-bottom: 1px solid var(--border);
            padding: 10px 0;
            font-size: 0.85rem;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 6px 10px;
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .breadcrumb li {
            display: flex;
            align-items: center;
            gap: 6px;
            color: var(--gray);
        }
        .breadcrumb li+li::before {
            content: "›";
            color: var(--gray);
            font-size: 1.1rem;
            margin-right: 4px;
        }
        .breadcrumb a {
            color: var(--secondary);
        }
        .breadcrumb .current {
            color: var(--text);
            font-weight: 600;
        }
        .hero {
            background: linear-gradient(145deg, #0d1b2a, #1b2d3f);
            color: var(--light);
            padding: 50px 20px 40px;
            text-align: center;
            border-radius: 0 0 var(--radius) var(--radius);
            margin-bottom: 32px;
        }
        .hero h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 12px;
            letter-spacing: -0.5px;
        }
        .hero h1 span {
            background: linear-gradient(135deg, var(--accent), #f39c12);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: 1.15rem;
            max-width: 720px;
            margin: 0 auto 20px;
            opacity: 0.9;
            line-height: 1.6;
        }
        .hero .meta-info {
            display: flex;
            justify-content: center;
            gap: 24px;
            flex-wrap: wrap;
            font-size: 0.95rem;
            opacity: 0.8;
        }
        .hero .meta-info i {
            margin-right: 6px;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 36px;
            padding-bottom: 48px;
        }
        .main-content {
            background: var(--light);
            border-radius: var(--radius);
            padding: 32px 30px;
            box-shadow: var(--shadow);
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }
        .sidebar-card {
            background: var(--light);
            border-radius: var(--radius);
            padding: 22px 20px;
            box-shadow: var(--shadow);
        }
        .sidebar-card h3 {
            font-size: 1.1rem;
            margin-bottom: 14px;
            border-bottom: 2px solid var(--secondary);
            padding-bottom: 8px;
            color: var(--primary);
        }
        .sidebar-card ul {
            list-style: none;
            padding: 0;
        }
        .sidebar-card ul li {
            padding: 6px 0;
            border-bottom: 1px solid var(--border);
        }
        .sidebar-card ul li:last-child {
            border-bottom: none;
        }
        .sidebar-card ul li a {
            font-size: 0.92rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .sidebar-card ul li a i {
            font-size: 0.75rem;
            color: var(--secondary);
        }
        .main-content h2 {
            font-size: 1.8rem;
            margin: 38px 0 16px;
            color: var(--primary);
            border-left: 5px solid var(--secondary);
            padding-left: 16px;
            line-height: 1.3;
        }
        .main-content h2:first-of-type {
            margin-top: 0;
        }
        .main-content h3 {
            font-size: 1.35rem;
            margin: 28px 0 12px;
            color: #1a2a3a;
            font-weight: 700;
        }
        .main-content h4 {
            font-size: 1.1rem;
            margin: 20px 0 10px;
            color: #2c3e50;
            font-weight: 600;
        }
        .main-content p {
            margin-bottom: 18px;
            font-size: 1rem;
            letter-spacing: 0.01em;
        }
        .main-content .highlight {
            background: #fff9e6;
            padding: 4px 10px;
            border-radius: 4px;
            font-weight: 600;
        }
        .main-content .emoji-big {
            font-size: 1.6rem;
            margin-right: 6px;
        }
        .main-content blockquote {
            border-left: 4px solid var(--secondary);
            background: #fef3f3;
            padding: 16px 22px;
            margin: 24px 0;
            border-radius: 0 8px 8px 0;
            font-style: italic;
            color: #333;
        }
        .main-content blockquote strong {
            color: var(--secondary);
        }
        .main-content ul,
        .main-content ol {
            margin: 0 0 18px 24px;
        }
        .main-content li {
            margin-bottom: 8px;
        }
        .main-content .feature-box {
            background: linear-gradient(135deg, #f8f9fa, #e9ecef);
            border-radius: var(--radius);
            padding: 20px 24px;
            margin: 24px 0;
            border-left: 5px solid var(--accent);
        }
        .main-content .feature-box i {
            color: var(--secondary);
            margin-right: 8px;
        }
        .main-content .data-table {
            width: 100%;
            border-collapse: collapse;
            margin: 24px 0;
            font-size: 0.95rem;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 1px 6px rgba(0, 0, 0, 0.06);
        }
        .main-content .data-table th {
            background: var(--primary);
            color: var(--light);
            padding: 12px 16px;
            text-align: left;
            font-weight: 600;
        }
        .main-content .data-table td {
            padding: 10px 16px;
            border-bottom: 1px solid var(--border);
        }
        .main-content .data-table tr:nth-child(even) {
            background: #f1f3f5;
        }
        .main-content .data-table tr:hover {
            background: #e9ecef;
        }
        .content-image {
            margin: 28px 0;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .content-image figcaption {
            background: var(--primary);
            color: var(--light);
            padding: 10px 16px;
            font-size: 0.85rem;
            text-align: center;
            font-style: italic;
        }
        .search-section {
            background: var(--primary);
            color: var(--light);
            padding: 28px 24px;
            border-radius: var(--radius);
            margin: 32px 0;
        }
        .search-section h3 {
            color: var(--accent);
            margin-bottom: 12px;
            font-size: 1.3rem;
        }
        .search-form {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }
        .search-form input {
            flex: 1;
            min-width: 200px;
            padding: 12px 18px;
            border: none;
            border-radius: 8px;
            font-size: 1rem;
            background: var(--light);
            color: var(--text);
            outline: none;
            transition: box-shadow var(--transition);
        }
        .search-form input:focus {
            box-shadow: 0 0 0 3px var(--accent);
        }
        .search-form button {
            padding: 12px 28px;
            background: var(--secondary);
            color: var(--light);
            border: none;
            border-radius: 8px;
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: background var(--transition), transform var(--transition);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .search-form button:hover {
            background: #b71c1c;
            transform: translateY(-2px);
        }
        .feedback-section {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
            margin: 32px 0;
        }
        .feedback-card {
            background: var(--light);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 24px 22px;
            box-shadow: var(--shadow);
        }
        .feedback-card h3 {
            font-size: 1.15rem;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--primary);
        }
        .feedback-card h3 i {
            color: var(--secondary);
        }
        .feedback-card form {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .feedback-card input,
        .feedback-card textarea,
        .feedback-card select {
            padding: 10px 14px;
            border: 1px solid var(--border);
            border-radius: 8px;
            font-size: 0.95rem;
            font-family: var(--font);
            transition: border-color var(--transition);
            background: #fafafa;
        }
        .feedback-card input:focus,
        .feedback-card textarea:focus,
        .feedback-card select:focus {
            border-color: var(--secondary);
            outline: none;
            background: var(--light);
        }
        .feedback-card textarea {
            resize: vertical;
            min-height: 80px;
        }
        .feedback-card button {
            padding: 10px 20px;
            background: var(--secondary);
            color: var(--light);
            border: none;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: background var(--transition), transform var(--transition);
            align-self: flex-start;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .feedback-card button:hover {
            background: #b71c1c;
            transform: translateY(-2px);
        }
        friend-link {
            display: block;
            background: var(--primary);
            color: var(--light);
            padding: 28px 24px;
            border-radius: var(--radius);
            margin-top: 32px;
        }
        friend-link h3 {
            color: var(--accent);
            font-size: 1.2rem;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        friend-link .friend-list {
            display: flex;
            flex-wrap: wrap;
            gap: 12px 24px;
            list-style: none;
            padding: 0;
        }
        friend-link .friend-list li a {
            color: rgba(255, 255, 255, 0.85);
            font-size: 0.95rem;
            transition: color var(--transition);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        friend-link .friend-list li a:hover {
            color: var(--accent);
            text-decoration: none;
        }
        friend-link .friend-list li a i {
            font-size: 0.7rem;
            color: var(--accent);
        }
        .site-footer {
            background: #0d1b2a;
            color: rgba(255, 255, 255, 0.75);
            padding: 32px 20px 24px;
            margin-top: 40px;
            border-radius: var(--radius) var(--radius) 0 0;
        }
        .site-footer .footer-inner {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
        }
        .site-footer .copyright {
            font-size: 0.88rem;
            opacity: 0.8;
        }
        .site-footer .copyright strong {
            color: var(--accent);
        }
        .site-footer .footer-links {
            display: flex;
            gap: 18px;
            flex-wrap: wrap;
        }
        .site-footer .footer-links a {
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.88rem;
        }
        .site-footer .footer-links a:hover {
            color: var(--accent);
        }
        @media (max-width: 992px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
            .sidebar {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
            .hero h1 {
                font-size: 2rem;
            }
            .feedback-section {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 768px) {
            .header-inner {
                padding: 10px 16px;
            }
            .my-logo {
                font-size: 1.4rem;
            }
            .nav-toggle {
                display: block;
            }
            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                gap: 4px;
                padding-top: 12px;
                border-top: 1px solid rgba(255, 255, 255, 0.1);
                margin-top: 8px;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 10px 0;
                font-size: 1rem;
                width: 100%;
                border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            }
            .main-nav a:last-child {
                border-bottom: none;
            }
            .hero {
                padding: 32px 16px 28px;
            }
            .hero h1 {
                font-size: 1.6rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .main-content {
                padding: 20px 16px;
            }
            .main-content h2 {
                font-size: 1.4rem;
            }
            .main-content h3 {
                font-size: 1.15rem;
            }
            .sidebar {
                grid-template-columns: 1fr;
            }
            .search-form {
                flex-direction: column;
            }
            .search-form button {
                width: 100%;
                justify-content: center;
            }
            .feedback-section {
                grid-template-columns: 1fr;
            }
            .site-footer .footer-inner {
                flex-direction: column;
                text-align: center;
            }
            .breadcrumb-wrap {
                font-size: 0.78rem;
            }
            friend-link .friend-list {
                flex-direction: column;
                gap: 6px;
            }
            .data-table {
                font-size: 0.82rem;
            }
            .data-table th,
            .data-table td {
                padding: 8px 10px;
            }
        }
        @media (max-width: 480px) {
            .hero h1 {
                font-size: 1.35rem;
            }
            .main-content h2 {
                font-size: 1.2rem;
                padding-left: 10px;
            }
            .container {
                padding: 0 12px;
            }
            .main-content {
                padding: 16px 12px;
            }
            .feedback-card {
                padding: 16px 14px;
            }
            .sidebar-card {
                padding: 16px 14px;
            }
            friend-link {
                padding: 20px 16px;
            }
        }
        .main-nav {
            transition: all 0.25s ease;
        }
        ::-webkit-scrollbar {
            width: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--gray);
            border-radius: 10px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--primary);
        }