*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        :root {
            --bg-primary: #0c0f14;
            --bg-secondary: #151a21;
            --bg-card: #1e252e;
            --text-primary: #e8edf2;
            --text-secondary: #a0aab5;
            --accent: #f5c542;
            --accent-hover: #ffd866;
            --border: #2c3540;
            --success: #4caf7d;
            --danger: #e0535c;
            --font-sans: 'Segoe UI', system-ui, -apple-system, Roboto, 'Helvetica Neue', sans-serif;
            --shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
            --radius: 12px;
            --radius-sm: 6px;
            --transition: 0.25s ease;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: var(--font-sans);
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.7;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a {
            color: var(--accent);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--accent-hover);
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: var(--bg-secondary);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 1000;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }
        .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: 1.5rem;
            font-weight: 800;
            color: var(--accent);
            letter-spacing: -0.5px;
            transition: opacity var(--transition);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .my-logo:hover {
            opacity: 0.85;
            text-decoration: none;
        }
        .my-logo i {
            font-size: 1.8rem;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: 1px solid var(--border);
            color: var(--text-primary);
            font-size: 1.6rem;
            padding: 6px 14px;
            border-radius: var(--radius-sm);
            cursor: pointer;
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: var(--bg-card);
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }
        .nav-menu a {
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 0.95rem;
            transition: all var(--transition);
            white-space: nowrap;
        }
        .nav-menu a:hover,
        .nav-menu a.active {
            color: var(--text-primary);
            background: var(--bg-card);
            text-decoration: none;
        }
        .breadcrumb {
            background: var(--bg-secondary);
            padding: 10px 20px;
            border-bottom: 1px solid var(--border);
            font-size: 0.88rem;
            color: var(--text-secondary);
        }
        .breadcrumb ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 6px 12px;
            max-width: 1200px;
            margin: 0 auto;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 12px;
            color: var(--text-secondary);
            font-weight: 600;
        }
        .breadcrumb a {
            color: var(--accent);
        }
        .breadcrumb a:hover {
            color: var(--accent-hover);
        }
        main {
            flex: 1;
            padding: 40px 0 60px;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        .article-body h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 10px;
            color: var(--accent);
            letter-spacing: -0.5px;
        }
        .article-body .subtitle {
            font-size: 1.15rem;
            color: var(--text-secondary);
            margin-bottom: 24px;
            border-left: 4px solid var(--accent);
            padding-left: 18px;
        }
        .article-body .meta {
            display: flex;
            flex-wrap: wrap;
            gap: 16px 30px;
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-bottom: 30px;
            padding-bottom: 18px;
            border-bottom: 1px solid var(--border);
        }
        .meta i {
            margin-right: 6px;
            color: var(--accent);
        }
        .article-body h2 {
            font-size: 2rem;
            font-weight: 700;
            margin: 48px 0 16px;
            color: var(--accent);
            border-bottom: 2px solid var(--border);
            padding-bottom: 8px;
        }
        .article-body h3 {
            font-size: 1.5rem;
            font-weight: 600;
            margin: 32px 0 12px;
            color: var(--text-primary);
        }
        .article-body h4 {
            font-size: 1.2rem;
            font-weight: 600;
            margin: 24px 0 10px;
            color: var(--text-secondary);
        }
        .article-body p {
            margin-bottom: 18px;
            color: var(--text-secondary);
            max-width: 75ch;
        }
        .article-body strong {
            color: var(--text-primary);
            font-weight: 600;
        }
        .article-body ul,
        .article-body ol {
            margin: 16px 0 24px 28px;
            color: var(--text-secondary);
        }
        .article-body li {
            margin-bottom: 8px;
        }
        .article-body blockquote {
            border-left: 4px solid var(--accent);
            padding: 16px 24px;
            margin: 24px 0;
            background: var(--bg-card);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            font-style: italic;
            color: var(--text-secondary);
        }
        .blockquote-author {
            margin-top: 8px;
            font-style: normal;
            font-weight: 600;
            color: var(--accent);
        }
        .featured-image {
            margin: 32px 0;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            background: var(--bg-card);
        }
        .featured-image img {
            width: 100%;
            max-height: 500px;
            object-fit: cover;
        }
        .featured-image figcaption {
            padding: 12px 18px;
            font-size: 0.88rem;
            color: var(--text-secondary);
            background: var(--bg-card);
            border-top: 1px solid var(--border);
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 24px 0;
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            overflow: hidden;
        }
        th,
        td {
            padding: 12px 18px;
            text-align: left;
            border-bottom: 1px solid var(--border);
        }
        th {
            background: var(--bg-secondary);
            color: var(--accent);
            font-weight: 600;
        }
        td {
            color: var(--text-secondary);
        }
        tr:last-child td {
            border-bottom: none;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 16px;
            margin: 28px 0;
        }
        .stat-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 20px 24px;
            text-align: center;
            transition: transform var(--transition), border-color var(--transition);
        }
        .stat-card:hover {
            transform: translateY(-4px);
            border-color: var(--accent);
        }
        .stat-card .num {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--accent);
            display: block;
        }
        .stat-card .label {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-top: 4px;
        }
        .tip-box {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 20px 24px;
            margin: 24px 0;
            border-left: 4px solid var(--accent);
        }
        .tip-box strong {
            color: var(--accent);
        }
        .link-list-inline {
            display: flex;
            flex-wrap: wrap;
            gap: 8px 16px;
            margin: 16px 0 24px;
        }
        .link-list-inline a {
            background: var(--bg-card);
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 0.9rem;
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .link-list-inline a:hover {
            background: var(--border);
            text-decoration: none;
            border-color: var(--accent);
        }
        .sidebar {
            position: sticky;
            top: 100px;
            align-self: start;
        }
        .sidebar-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 20px;
            margin-bottom: 24px;
        }
        .sidebar-card h3 {
            font-size: 1.15rem;
            color: var(--accent);
            margin-bottom: 12px;
            border-bottom: 1px solid var(--border);
            padding-bottom: 8px;
        }
        .sidebar-card ul {
            list-style: none;
            padding: 0;
        }
        .sidebar-card li {
            margin-bottom: 6px;
        }
        .sidebar-card a {
            color: var(--text-secondary);
            font-size: 0.92rem;
        }
        .sidebar-card a:hover {
            color: var(--accent);
        }
        .interaction-section {
            margin-top: 56px;
            padding-top: 32px;
            border-top: 1px solid var(--border);
        }
        .interaction-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
        }
        .form-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 24px 28px;
        }
        .form-card h3 {
            font-size: 1.3rem;
            color: var(--accent);
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .form-card label {
            display: block;
            font-size: 0.92rem;
            color: var(--text-secondary);
            margin-bottom: 4px;
            font-weight: 500;
        }
        .form-card input,
        .form-card textarea,
        .form-card select {
            width: 100%;
            padding: 10px 14px;
            background: var(--bg-primary);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            color: var(--text-primary);
            font-family: var(--font-sans);
            font-size: 0.95rem;
            transition: border-color var(--transition);
            margin-bottom: 14px;
        }
        .form-card input:focus,
        .form-card textarea:focus,
        .form-card select:focus {
            outline: none;
            border-color: var(--accent);
        }
        .form-card textarea {
            min-height: 100px;
            resize: vertical;
        }
        .form-card .btn {
            background: var(--accent);
            color: #0c0f14;
            font-weight: 700;
            border: none;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            cursor: pointer;
            transition: all var(--transition);
            font-size: 1rem;
        }
        .form-card .btn:hover {
            background: var(--accent-hover);
            transform: translateY(-2px);
        }
        .form-card .btn i {
            margin-right: 8px;
        }
        .star-rating {
            display: flex;
            gap: 6px;
            margin-bottom: 14px;
            direction: rtl;
            justify-content: flex-end;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 1.8rem;
            color: var(--border);
            cursor: pointer;
            transition: color var(--transition);
        }
        .star-rating input:checked~label,
        .star-rating label:hover,
        .star-rating label:hover~label {
            color: var(--accent);
        }
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border);
            padding: 36px 20px 24px;
            margin-top: auto;
        }
        .footer-inner {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 32px;
        }
        .footer-inner h4 {
            color: var(--accent);
            font-size: 1.1rem;
            margin-bottom: 12px;
        }
        .footer-inner p,
        .footer-inner a {
            color: var(--text-secondary);
            font-size: 0.9rem;
        }
        .footer-inner a:hover {
            color: var(--accent-hover);
        }
        .footer-bottom {
            text-align: center;
            padding-top: 24px;
            margin-top: 24px;
            border-top: 1px solid var(--border);
            color: var(--text-secondary);
            font-size: 0.85rem;
        }
        .footer-bottom .copy {
            color: var(--text-secondary);
        }
        friend-link {
            display: block;
            margin-top: 12px;
        }
        friend-link a {
            display: inline-block;
            margin-right: 16px;
            margin-bottom: 6px;
        }
        @media (max-width: 992px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .interaction-grid {
                grid-template-columns: 1fr;
            }
            .footer-inner {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            .nav-menu {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: stretch;
                padding: 12px 0 4px;
                gap: 4px;
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-menu a {
                padding: 10px 16px;
                border-radius: var(--radius-sm);
            }
            .header-inner {
                padding: 10px 16px;
            }
            .my-logo {
                font-size: 1.25rem;
            }
            .my-logo i {
                font-size: 1.4rem;
            }
            .article-body h1 {
                font-size: 1.9rem;
            }
            .article-body h2 {
                font-size: 1.5rem;
            }
            .article-body h3 {
                font-size: 1.25rem;
            }
            .sidebar {
                grid-template-columns: 1fr;
            }
            .footer-inner {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }
            .breadcrumb {
                font-size: 0.8rem;
                padding: 8px 16px;
            }
            .breadcrumb ol {
                gap: 4px 8px;
            }
        }
        @media (max-width: 480px) {
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .form-card {
                padding: 16px 18px;
            }
            .star-rating label {
                font-size: 1.5rem;
            }
            .article-body ul,
            .article-body ol {
                margin-left: 18px;
            }
        }
        .skeleton {
            background: linear-gradient(90deg, var(--bg-card) 25%, var(--bg-secondary) 50%, var(--bg-card) 75%);
            background-size: 200% 100%;
            animation: skeleton-loading 1.5s infinite;
            border-radius: var(--radius-sm);
        }
        @keyframes skeleton-loading {
            0% {
                background-position: 200% 0;
            }
            100% {
                background-position: -200% 0;
            }
        }
        ::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-primary);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--border);
            border-radius: 3px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-secondary);
        }