*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Roboto, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
            background: #f6f8fc;
            color: #1e293b;
            line-height: 1.7;
            padding: 0;
            margin: 0;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        a {
            color: #1a4b8c;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #e63946;
            text-decoration: underline;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, #0a1f3c 0%, #1a3a6b 100%);
            color: #fff;
            padding: 14px 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            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: 1.8rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #f9d976, #f39c12);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-shadow: none;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .my-logo i {
            -webkit-text-fill-color: #f9d976;
            font-size: 1.6rem;
        }
        .my-logo:hover {
            opacity: 0.85;
            text-decoration: none;
        }
        .nav-bar {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }
        .nav-bar a {
            color: #e0e9f5;
            font-weight: 500;
            padding: 6px 14px;
            border-radius: 30px;
            font-size: 0.9rem;
            transition: background 0.25s, color 0.25s;
        }
        .nav-bar a:hover {
            background: rgba(255, 255, 255, 0.15);
            color: #f9d976;
            text-decoration: none;
        }
        .nav-bar .active {
            background: rgba(249, 217, 118, 0.18);
            color: #f9d976;
        }
        .hamburger {
            display: none;
            font-size: 1.6rem;
            background: none;
            border: none;
            color: #fff;
            cursor: pointer;
            padding: 4px 10px;
            border-radius: 8px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .nav-mobile {
            display: none;
            width: 100%;
            flex-direction: column;
            background: #0f2a4a;
            border-radius: 16px;
            padding: 12px 8px;
            margin-top: 12px;
            gap: 4px;
        }
        .nav-mobile a {
            color: #e0e9f5;
            padding: 10px 16px;
            border-radius: 10px;
            font-weight: 500;
        }
        .nav-mobile a:hover {
            background: rgba(255, 255, 255, 0.08);
            color: #f9d976;
        }
        .breadcrumb {
            background: #fff;
            padding: 12px 0;
            border-bottom: 1px solid #e9edf4;
            font-size: 0.88rem;
        }
        .breadcrumb ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 6px 12px;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 10px;
            color: #94a3b8;
        }
        .breadcrumb a {
            color: #1a4b8c;
        }
        .breadcrumb .current {
            color: #64748b;
            font-weight: 500;
        }
        .main-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            padding: 30px 0 50px;
        }
        @media (max-width: 900px) {
            .main-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }
        }
        .sidebar {
            position: sticky;
            top: 100px;
            align-self: start;
        }
        .sidebar-card {
            background: #fff;
            border-radius: 16px;
            padding: 24px 20px;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
            margin-bottom: 24px;
            border: 1px solid #eef2f8;
        }
        .sidebar-card h3 {
            font-size: 1.1rem;
            margin-bottom: 14px;
            color: #0a1f3c;
            border-left: 4px solid #f39c12;
            padding-left: 12px;
        }
        .sidebar-card ul {
            list-style: none;
        }
        .sidebar-card ul li {
            padding: 6px 0;
            border-bottom: 1px dashed #e9edf4;
        }
        .sidebar-card ul li:last-child {
            border-bottom: none;
        }
        .sidebar-card ul li a {
            font-size: 0.9rem;
            display: block;
            padding: 4px 0;
        }
        .sidebar-card .highlight-link {
            color: #e63946;
            font-weight: 600;
        }
        .content-area h1 {
            font-size: 2.4rem;
            font-weight: 800;
            color: #0a1f3c;
            line-height: 1.25;
            margin-bottom: 12px;
        }
        .content-area .subtitle {
            font-size: 1.1rem;
            color: #475569;
            margin-bottom: 28px;
            border-left: 4px solid #f39c12;
            padding-left: 18px;
        }
        .content-area h2 {
            font-size: 1.7rem;
            font-weight: 700;
            color: #0a1f3c;
            margin-top: 48px;
            margin-bottom: 16px;
            border-bottom: 2px solid #e9edf4;
            padding-bottom: 8px;
        }
        .content-area h3 {
            font-size: 1.25rem;
            font-weight: 600;
            color: #1e3a5f;
            margin-top: 32px;
            margin-bottom: 10px;
        }
        .content-area h4 {
            font-size: 1.05rem;
            font-weight: 600;
            color: #2d4a72;
            margin-top: 24px;
            margin-bottom: 8px;
        }
        .content-area p {
            margin-bottom: 18px;
            font-size: 1.02rem;
            color: #1e293b;
        }
        .content-area .intro-highlight {
            background: #eef6ff;
            border-radius: 16px;
            padding: 24px 28px;
            margin-bottom: 28px;
            border-left: 6px solid #1a4b8c;
        }
        .content-area ul,
        .content-area ol {
            margin-bottom: 20px;
            padding-left: 28px;
        }
        .content-area li {
            margin-bottom: 8px;
            font-size: 1.02rem;
        }
        .featured-image {
            margin: 30px 0 30px;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.06);
        }
        .featured-image figcaption {
            background: #f1f5f9;
            padding: 10px 18px;
            font-size: 0.88rem;
            color: #475569;
            text-align: center;
            font-style: italic;
        }
        .search-box {
            background: #fff;
            border-radius: 60px;
            display: flex;
            align-items: center;
            padding: 0 6px 0 20px;
            border: 1px solid #dce2ec;
            transition: box-shadow 0.25s, border-color 0.25s;
            max-width: 520px;
            margin: 20px 0 28px;
        }
        .search-box:focus-within {
            box-shadow: 0 0 0 4px rgba(26, 75, 140, 0.12);
            border-color: #1a4b8c;
        }
        .search-box input {
            flex: 1;
            border: none;
            padding: 14px 0;
            font-size: 1rem;
            background: transparent;
            outline: none;
            color: #1e293b;
        }
        .search-box button {
            background: #1a4b8c;
            border: none;
            color: #fff;
            padding: 10px 22px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: background 0.2s;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .search-box button:hover {
            background: #e63946;
        }
        .interaction-section {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
            margin: 50px 0 30px;
            padding: 28px 0;
            border-top: 2px solid #e9edf4;
            border-bottom: 2px solid #e9edf4;
        }
        @media (max-width: 640px) {
            .interaction-section {
                grid-template-columns: 1fr;
                gap: 32px;
            }
        }
        .interaction-card {
            background: #fff;
            border-radius: 16px;
            padding: 24px 22px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
            border: 1px solid #eef2f8;
        }
        .interaction-card h3 {
            font-size: 1.15rem;
            margin-bottom: 14px;
            color: #0a1f3c;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .interaction-card form {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .interaction-card textarea,
        .interaction-card input {
            border: 1px solid #dce2ec;
            border-radius: 12px;
            padding: 12px 16px;
            font-size: 0.95rem;
            font-family: inherit;
            resize: vertical;
            transition: border-color 0.2s;
        }
        .interaction-card textarea:focus,
        .interaction-card input:focus {
            border-color: #1a4b8c;
            outline: none;
            box-shadow: 0 0 0 3px rgba(26, 75, 140, 0.08);
        }
        .interaction-card .btn-submit {
            background: #1a4b8c;
            color: #fff;
            border: none;
            padding: 12px 20px;
            border-radius: 40px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
            font-size: 0.95rem;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }
        .interaction-card .btn-submit:hover {
            background: #e63946;
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 4px;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 1.8rem;
            color: #d1d9e6;
            cursor: pointer;
            transition: color 0.15s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f5b342;
        }
        .data-table {
            width: 100%;
            border-collapse: collapse;
            border-radius: 12px;
            overflow: hidden;
            margin: 24px 0 30px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
        }
        .data-table thead {
            background: #0a1f3c;
            color: #fff;
        }
        .data-table th {
            padding: 14px 18px;
            text-align: left;
            font-weight: 600;
        }
        .data-table td {
            padding: 12px 18px;
            border-bottom: 1px solid #e9edf4;
            background: #fff;
        }
        .data-table tbody tr:hover td {
            background: #f8faff;
        }
        .site-footer {
            background: #0a1f3c;
            color: #cbd5e1;
            padding: 40px 0 24px;
            margin-top: 50px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 36px;
            margin-bottom: 28px;
        }
        @media (max-width: 700px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
        }
        .site-footer h4 {
            color: #f9d976;
            font-size: 1.05rem;
            margin-bottom: 14px;
        }
        .site-footer a {
            color: #b0c8e0;
        }
        .site-footer a:hover {
            color: #f9d976;
        }
        .friend-link {
            display: flex;
            flex-wrap: wrap;
            gap: 10px 20px;
            padding: 16px 0;
            border-top: 1px solid #1e3a5f;
            border-bottom: 1px solid #1e3a5f;
            margin-bottom: 20px;
            font-size: 0.92rem;
        }
        .friend-link a {
            color: #b0c8e0;
            font-weight: 400;
        }
        .friend-link a:hover {
            color: #f9d976;
        }
        .friend-link::before {
            content: "🔗 Friends:";
            color: #f9d976;
            font-weight: 600;
            margin-right: 6px;
        }
        .copyright {
            text-align: center;
            font-size: 0.85rem;
            color: #8899b0;
            padding-top: 16px;
            border-top: 1px solid #1e3a5f;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .nav-bar {
                display: none;
            }
            .nav-mobile.open {
                display: flex;
            }
            .content-area h1 {
                font-size: 1.8rem;
            }
            .content-area h2 {
                font-size: 1.4rem;
            }
            .breadcrumb ol {
                font-size: 0.8rem;
                gap: 4px 8px;
            }
            .search-box {
                max-width: 100%;
                border-radius: 40px;
            }
            .search-box button span {
                display: none;
            }
            .sidebar {
                position: static;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 14px;
            }
            .my-logo {
                font-size: 1.4rem;
            }
            .header-inner {
                gap: 8px;
            }
            .content-area h1 {
                font-size: 1.5rem;
            }
            .data-table {
                font-size: 0.82rem;
            }
            .data-table th,
            .data-table td {
                padding: 8px 10px;
            }
        }
        .schema-hidden {
            display: none;
        }
        .anchor-offset {
            scroll-margin-top: 90px;
        }
        .text-muted {
            color: #64748b;
            font-size: 0.92rem;
        }
        .last-updated {
            display: inline-block;
            background: #eef2f8;
            padding: 4px 16px;
            border-radius: 40px;
            font-size: 0.82rem;
            color: #475569;
            margin-bottom: 18px;
        }
        .badge {
            display: inline-block;
            background: #f39c12;
            color: #0a1f3c;
            font-weight: 700;
            padding: 2px 12px;
            border-radius: 40px;
            font-size: 0.75rem;
            letter-spacing: 0.3px;
        }