* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Roboto, system-ui, -apple-system, sans-serif;
            background: #f6f8fc;
            color: #1e293b;
            line-height: 1.7;
            font-size: 16px;
        }
        a {
            color: #1d4ed8;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #0f3b8e;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            border-radius: 12px;
            display: block;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, #0b1a33 0%, #1a3a5c 100%);
            padding: 16px 0;
            border-bottom: 4px solid #f59e0b;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 28px;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(to right, #f59e0b, #fbbf24);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-decoration: none !important;
        }
        .my-logo:hover {
            opacity: 0.85;
        }
        .my-logo span {
            font-weight: 300;
            font-size: 14px;
            display: block;
            -webkit-text-fill-color: #94a3b8;
            color: #94a3b8;
            letter-spacing: 1px;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: 2px solid #f59e0b;
            color: #f59e0b;
            font-size: 24px;
            padding: 6px 14px;
            border-radius: 8px;
            cursor: pointer;
            transition: 0.2s;
        }
        .nav-toggle:hover {
            background: #f59e0b;
            color: #0b1a33;
        }
        .main-nav {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            align-items: center;
        }
        .main-nav a {
            color: #e2e8f0;
            padding: 8px 16px;
            border-radius: 30px;
            font-weight: 500;
            font-size: 14px;
            transition: 0.2s;
            white-space: nowrap;
        }
        .main-nav a:hover {
            background: rgba(245, 158, 11, 0.2);
            color: #fbbf24;
            text-decoration: none;
        }
        .main-nav a i {
            margin-right: 6px;
        }
        .breadcrumb {
            background: #e9edf4;
            padding: 12px 0;
            font-size: 13px;
            border-bottom: 1px solid #d1d9e6;
        }
        .breadcrumb ul {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 8px;
            color: #64748b;
        }
        .breadcrumb a {
            color: #1d4ed8;
        }
        .breadcrumb .current {
            color: #475569;
            font-weight: 600;
        }
        .page-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            padding: 40px 0;
        }
        @media (max-width: 992px) {
            .page-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }
        }
        .main-content {
            min-width: 0;
        }
        .sidebar {
            min-width: 0;
        }
        .sidebar-card {
            background: #fff;
            border-radius: 16px;
            padding: 24px;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
            margin-bottom: 24px;
            border: 1px solid #e9edf4;
        }
        .sidebar-card h3 {
            font-size: 18px;
            margin-bottom: 12px;
            border-left: 4px solid #f59e0b;
            padding-left: 12px;
            color: #0b1a33;
        }
        .sidebar-card ul {
            list-style: none;
        }
        .sidebar-card li {
            margin-bottom: 10px;
        }
        .sidebar-card li a {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
        }
        .sidebar-card li a i {
            color: #f59e0b;
            width: 18px;
            text-align: center;
        }
        h1 {
            font-size: 40px;
            font-weight: 800;
            line-height: 1.2;
            color: #0b1a33;
            margin-bottom: 16px;
        }
        h2 {
            font-size: 30px;
            font-weight: 700;
            margin-top: 48px;
            margin-bottom: 16px;
            color: #0b1a33;
            border-bottom: 3px solid #f59e0b;
            padding-bottom: 8px;
        }
        h3 {
            font-size: 24px;
            font-weight: 600;
            margin-top: 32px;
            margin-bottom: 12px;
            color: #1a3a5c;
        }
        h4 {
            font-size: 19px;
            font-weight: 600;
            margin-top: 24px;
            margin-bottom: 8px;
            color: #2d4a6e;
        }
        p {
            margin-bottom: 18px;
            color: #334155;
        }
        .lead {
            font-size: 19px;
            color: #1e293b;
            font-weight: 500;
            margin-bottom: 24px;
            padding: 16px 20px;
            background: #eef2f9;
            border-radius: 12px;
            border-left: 5px solid #f59e0b;
        }
        .highlight-box {
            background: linear-gradient(145deg, #fef9e7, #fdf2d7);
            padding: 20px 24px;
            border-radius: 14px;
            border: 1px solid #fde68a;
            margin: 24px 0;
        }
        .highlight-box strong {
            color: #92400e;
        }
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 16px;
            margin: 20px 0 30px;
        }
        .feature-item {
            background: #fff;
            padding: 18px 16px;
            border-radius: 14px;
            text-align: center;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
            border: 1px solid #e9edf4;
            transition: transform 0.2s, box-shadow 0.2s;
        }
        .feature-item:hover {
            transform: translateY(-4px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
        }
        .feature-item i {
            font-size: 36px;
            color: #f59e0b;
            margin-bottom: 10px;
        }
        .feature-item h4 {
            margin-top: 0;
            font-size: 16px;
        }
        .feature-item p {
            font-size: 13px;
            margin-bottom: 0;
            color: #64748b;
        }
        .featured-image {
            margin: 30px 0;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
            background: #e2e8f0;
        }
        .featured-image img {
            width: 100%;
            height: auto;
            display: block;
        }
        .featured-image figcaption {
            padding: 12px 20px;
            font-size: 13px;
            color: #475569;
            background: #f1f5f9;
            border-top: 1px solid #d1d9e6;
        }
        .interaction-section {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
            margin: 40px 0;
        }
        @media (max-width: 700px) {
            .interaction-section {
                grid-template-columns: 1fr;
            }
        }
        .interaction-card {
            background: #fff;
            border-radius: 16px;
            padding: 24px 28px;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
            border: 1px solid #e9edf4;
        }
        .interaction-card h3 {
            margin-top: 0;
            font-size: 20px;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .interaction-card h3 i {
            color: #f59e0b;
        }
        .form-group {
            margin-bottom: 16px;
        }
        .form-group label {
            display: block;
            font-weight: 600;
            font-size: 14px;
            margin-bottom: 4px;
            color: #1e293b;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 10px 14px;
            border: 2px solid #d1d9e6;
            border-radius: 10px;
            font-size: 15px;
            font-family: inherit;
            transition: 0.2s;
            background: #fafcff;
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            border-color: #f59e0b;
            outline: none;
            box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.15);
        }
        .btn {
            display: inline-block;
            padding: 10px 28px;
            border: none;
            border-radius: 30px;
            font-weight: 700;
            font-size: 15px;
            cursor: pointer;
            transition: 0.25s;
            background: #1d4ed8;
            color: #fff;
        }
        .btn:hover {
            background: #0f3b8e;
            transform: scale(1.02);
        }
        .btn-warning {
            background: #f59e0b;
            color: #0b1a33;
        }
        .btn-warning:hover {
            background: #d97706;
            color: #fff;
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            gap: 6px;
            justify-content: flex-end;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 30px;
            color: #d1d9e6;
            cursor: pointer;
            transition: 0.15s;
        }
        .star-rating input:checked~label,
        .star-rating label:hover,
        .star-rating label:hover~label {
            color: #f59e0b;
        }
        .link-list-vertical a {
            display: block;
            padding: 8px 0;
            border-bottom: 1px solid #e9edf4;
            font-size: 14px;
        }
        .link-list-vertical a i {
            margin-right: 8px;
            color: #f59e0b;
        }
        .link-list-vertical a:last-child {
            border-bottom: none;
        }
        .site-footer {
            background: #0b1a33;
            color: #cbd5e1;
            padding: 40px 0 24px;
            margin-top: 40px;
            border-top: 4px solid #f59e0b;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }
        @media (max-width: 700px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
        }
        .footer-grid h4 {
            color: #fbbf24;
            margin-top: 0;
            font-size: 17px;
            border-bottom: 2px solid #1a3a5c;
            padding-bottom: 8px;
        }
        .footer-grid a {
            color: #94a3b8;
            display: block;
            margin-bottom: 6px;
            font-size: 14px;
        }
        .footer-grid a:hover {
            color: #fbbf24;
            text-decoration: none;
        }
        friend-link {
            display: block;
            background: rgba(255, 255, 255, 0.04);
            padding: 16px 20px;
            border-radius: 12px;
            border: 1px solid #1a3a5c;
            margin-top: 8px;
        }
        friend-link a {
            display: inline-block;
            margin-right: 20px;
            margin-bottom: 4px;
        }
        .copyright {
            border-top: 1px solid #1a3a5c;
            padding-top: 20px;
            text-align: center;
            font-size: 13px;
            color: #64748b;
        }
        .copyright strong {
            color: #94a3b8;
        }
        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                padding-top: 16px;
                gap: 4px;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 12px 16px;
                border-radius: 10px;
                background: rgba(255, 255, 255, 0.05);
            }
            h1 {
                font-size: 30px;
            }
            h2 {
                font-size: 24px;
            }
            h3 {
                font-size: 20px;
            }
            .page-grid {
                padding: 20px 0;
            }
            .site-header {
                padding: 12px 0;
            }
            .my-logo {
                font-size: 22px;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 14px;
            }
            h1 {
                font-size: 26px;
            }
            .interaction-card {
                padding: 18px;
            }
        }
        .last-updated {
            display: inline-block;
            font-size: 13px;
            color: #64748b;
            background: #e9edf4;
            padding: 4px 14px;
            border-radius: 30px;
            margin-bottom: 20px;
        }
        .last-updated i {
            margin-right: 6px;
        }
        .toc {
            background: #fff;
            border-radius: 16px;
            padding: 20px 24px;
            border: 1px solid #e9edf4;
            margin-bottom: 30px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
        }
        .toc h3 {
            margin-top: 0;
            font-size: 18px;
        }
        .toc ol {
            padding-left: 20px;
            columns: 2;
            column-gap: 30px;
        }
        .toc ol li {
            margin-bottom: 6px;
            break-inside: avoid;
        }
        @media (max-width: 600px) {
            .toc ol {
                columns: 1;
            }
        }
        .toc a {
            font-size: 14px;
        }
        blockquote {
            border-left: 5px solid #f59e0b;
            padding: 16px 20px;
            margin: 20px 0;
            background: #f8fafc;
            border-radius: 0 12px 12px 0;
            font-style: italic;
            color: #1e293b;
        }
        blockquote cite {
            display: block;
            margin-top: 8px;
            font-size: 13px;
            color: #64748b;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            font-size: 14px;
            background: #fff;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
        }
        th {
            background: #0b1a33;
            color: #fbbf24;
            padding: 12px 16px;
            text-align: left;
            font-weight: 600;
        }
        td {
            padding: 10px 16px;
            border-bottom: 1px solid #e9edf4;
        }
        tr:last-child td {
            border-bottom: none;
        }
        tr:hover td {
            background: #f8fafc;
        }
        .badge {
            display: inline-block;
            background: #f59e0b;
            color: #0b1a33;
            padding: 2px 12px;
            border-radius: 30px;
            font-size: 12px;
            font-weight: 700;
        }