*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            background: #f4f7fc;
            color: #1a2634;
            line-height: 1.7;
        }
        a {
            color: #0057a3;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover,
        a:focus {
            color: #003b6f;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.25;
            margin-bottom: 0.5rem;
            color: #0b1e2e;
        }
        h1 {
            font-size: 2.2rem;
            margin-top: 0.5rem;
        }
        h2 {
            font-size: 1.6rem;
            margin-top: 2rem;
            border-left: 5px solid #0057a3;
            padding-left: 0.9rem;
        }
        h3 {
            font-size: 1.25rem;
            margin-top: 1.5rem;
            color: #13324b;
        }
        h4 {
            font-size: 1.05rem;
            margin-top: 1rem;
            color: #1e405e;
        }
        p {
            margin-bottom: 1.2rem;
        }
        ul,
        ol {
            margin-bottom: 1.2rem;
            padding-left: 1.6rem;
        }
        li {
            margin-bottom: 0.4rem;
        }
        blockquote {
            border-left: 4px solid #0057a3;
            background: #eaf1fa;
            padding: 1rem 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
            font-style: italic;
            color: #1e3a5f;
        }
        hr {
            border: none;
            border-top: 2px dashed #cbd5e1;
            margin: 2.5rem 0;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.2rem;
        }
        .site-header {
            background: linear-gradient(135deg, #0b1e2e 0%, #1a3a5a 100%);
            color: #fff;
            padding: 0.6rem 0;
            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: 1.8rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: #fff;
            background: rgba(255, 255, 255, 0.06);
            padding: 0.2rem 1rem 0.2rem 0.6rem;
            border-radius: 40px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            text-decoration: none;
            border: 1px solid rgba(255, 255, 255, 0.08);
        }
        .my-logo i {
            color: #f5c842;
            font-size: 1.6rem;
        }
        .my-logo:hover {
            background: rgba(255, 255, 255, 0.12);
            text-decoration: none;
            color: #fff;
        }
        .my-logo span {
            font-weight: 300;
            font-size: 0.7rem;
            opacity: 0.7;
            display: block;
            line-height: 1;
        }
        .nav-wrapper {
            display: flex;
            align-items: center;
            gap: 0.3rem;
        }
        .nav-list {
            display: flex;
            list-style: none;
            gap: 0.2rem;
            padding: 0;
            margin: 0;
        }
        .nav-list li a {
            color: #e8f0fe;
            padding: 0.4rem 0.9rem;
            border-radius: 30px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: background 0.2s, color 0.2s;
            white-space: nowrap;
            display: inline-block;
        }
        .nav-list li a:hover,
        .nav-list li a:focus {
            background: rgba(255, 255, 255, 0.15);
            color: #fff;
            text-decoration: none;
        }
        .nav-list li a.active {
            background: #f5c842;
            color: #0b1e2e;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.6rem;
            cursor: pointer;
            padding: 0.2rem 0.5rem;
            border-radius: 6px;
        }
        .hamburger:focus {
            outline: 2px solid #f5c842;
        }
        .breadcrumb-wrap {
            background: #e9f0f7;
            padding: 0.5rem 0;
            border-bottom: 1px solid #d0ddee;
            font-size: 0.85rem;
        }
        .breadcrumb-wrap nav {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 0.3rem;
        }
        .breadcrumb-wrap a {
            color: #0057a3;
        }
        .breadcrumb-wrap .separator {
            color: #7a8da0;
            margin: 0 0.2rem;
        }
        .breadcrumb-wrap .current {
            color: #1e3a5f;
            font-weight: 600;
        }
        .hero-section {
            background: linear-gradient(145deg, #e5eff9 0%, #d4e2f0 100%);
            padding: 2.5rem 0 2rem;
            border-bottom: 1px solid #c8d8ea;
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            align-items: center;
        }
        .hero-text .badge {
            display: inline-block;
            background: #0057a3;
            color: #fff;
            padding: 0.2rem 1rem;
            border-radius: 30px;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.5px;
            text-transform: uppercase;
            margin-bottom: 0.7rem;
        }
        .hero-text h1 {
            font-size: 2.6rem;
            margin-top: 0;
        }
        .hero-text p {
            font-size: 1.1rem;
            color: #1e3a5f;
        }
        .hero-stats {
            display: flex;
            gap: 1.5rem;
            margin-top: 1.2rem;
            flex-wrap: wrap;
        }
        .hero-stats .stat {
            background: #fff;
            padding: 0.8rem 1.4rem;
            border-radius: 16px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
            text-align: center;
            flex: 1 0 100px;
        }
        .hero-stats .stat .num {
            font-size: 1.6rem;
            font-weight: 800;
            color: #0057a3;
            display: block;
        }
        .hero-stats .stat .label {
            font-size: 0.75rem;
            text-transform: uppercase;
            color: #4d6a8a;
            letter-spacing: 0.3px;
        }
        .hero-img img {
            border-radius: 20px;
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
            width: 100%;
            height: auto;
            object-fit: cover;
        }
        .main-content {
            padding: 2.5rem 0 3rem;
        }
        .content-layout {
            display: grid;
            grid-template-columns: 2.5fr 1fr;
            gap: 2.5rem;
        }
        .article-body p,
        .article-body li {
            font-size: 1.02rem;
            color: #1f2e3f;
        }
        .article-body .section-img {
            margin: 1.8rem 0;
            border-radius: 16px;
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.06);
        }
        .article-body .section-img figcaption {
            text-align: center;
            font-size: 0.85rem;
            color: #4d6a8a;
            margin-top: 0.5rem;
            font-style: italic;
        }
        .highlight-box {
            background: #eaf1fa;
            border-radius: 16px;
            padding: 1.6rem 2rem;
            margin: 1.8rem 0;
            border: 1px solid #c8d8ea;
        }
        .highlight-box h4 {
            margin-top: 0;
            color: #0057a3;
        }
        .insight-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1.2rem;
            margin: 1.5rem 0;
        }
        .insight-card {
            background: #fff;
            padding: 1.2rem 1.2rem;
            border-radius: 14px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
            border: 1px solid #e2ebf5;
            text-align: center;
            transition: transform 0.2s, box-shadow 0.2s;
        }
        .insight-card:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.06);
        }
        .insight-card i {
            font-size: 1.8rem;
            color: #0057a3;
            margin-bottom: 0.5rem;
        }
        .insight-card h4 {
            margin: 0.2rem 0 0.3rem;
        }
        .insight-card p {
            font-size: 0.9rem;
            margin-bottom: 0;
            color: #3b5777;
        }
        .table-wrap {
            overflow-x: auto;
            margin: 1.8rem 0;
        }
        .table-wrap table {
            width: 100%;
            border-collapse: collapse;
            background: #fff;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
        }
        .table-wrap th {
            background: #0b1e2e;
            color: #fff;
            padding: 0.8rem 1rem;
            text-align: left;
            font-weight: 600;
        }
        .table-wrap td {
            padding: 0.7rem 1rem;
            border-bottom: 1px solid #e8eff7;
        }
        .table-wrap tr:last-child td {
            border-bottom: none;
        }
        .table-wrap tr:hover td {
            background: #f6faff;
        }
        .sidebar {
            background: #fff;
            border-radius: 20px;
            padding: 1.6rem 1.4rem;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
            border: 1px solid #dfe9f3;
            height: fit-content;
            position: sticky;
            top: 100px;
        }
        .sidebar h3 {
            margin-top: 0;
            font-size: 1.2rem;
            border-bottom: 2px solid #e2ebf5;
            padding-bottom: 0.5rem;
        }
        .sidebar ul {
            list-style: none;
            padding: 0;
            margin: 0.8rem 0 0;
        }
        .sidebar ul li {
            padding: 0.4rem 0;
            border-bottom: 1px solid #f0f4fa;
        }
        .sidebar ul li a {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            font-weight: 500;
        }
        .sidebar ul li a i {
            width: 1.2rem;
            color: #0057a3;
        }
        .search-section {
            background: #eaf1fa;
            padding: 1.6rem 1.8rem;
            border-radius: 20px;
            margin: 2.5rem 0 1.2rem;
            border: 1px solid #c8d8ea;
        }
        .search-form {
            display: flex;
            gap: 0.6rem;
            flex-wrap: wrap;
        }
        .search-form input[type="text"] {
            flex: 1;
            min-width: 180px;
            padding: 0.7rem 1.2rem;
            border: 2px solid #c8d8ea;
            border-radius: 40px;
            font-size: 1rem;
            background: #fff;
            transition: border 0.2s;
        }
        .search-form input[type="text"]:focus {
            border-color: #0057a3;
            outline: none;
        }
        .search-form button {
            padding: 0.7rem 1.6rem;
            background: #0057a3;
            color: #fff;
            border: none;
            border-radius: 40px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .search-form button:hover {
            background: #003b6f;
            transform: scale(1.02);
        }
        .feedback-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.8rem;
            margin: 2rem 0;
        }
        .feedback-card {
            background: #fff;
            padding: 1.6rem 1.8rem;
            border-radius: 20px;
            border: 1px solid #dfe9f3;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.03);
        }
        .feedback-card h3 {
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        .feedback-card form {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
            margin-top: 1rem;
        }
        .feedback-card form input,
        .feedback-card form textarea {
            padding: 0.6rem 1rem;
            border: 2px solid #dce6f0;
            border-radius: 12px;
            font-size: 0.95rem;
            font-family: inherit;
            transition: border 0.2s;
        }
        .feedback-card form input:focus,
        .feedback-card form textarea:focus {
            border-color: #0057a3;
            outline: none;
        }
        .feedback-card form textarea {
            min-height: 80px;
            resize: vertical;
        }
        .feedback-card form button {
            padding: 0.65rem 1.4rem;
            background: #0057a3;
            color: #fff;
            border: none;
            border-radius: 40px;
            font-weight: 600;
            cursor: pointer;
            align-self: flex-start;
            transition: background 0.2s;
        }
        .feedback-card form button:hover {
            background: #003b6f;
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 0.2rem;
            font-size: 1.6rem;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            cursor: pointer;
            color: #cbd5e1;
            transition: color 0.15s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f5b342;
        }
        .site-footer {
            background: #0b1e2e;
            color: #c8d8ea;
            padding: 2.5rem 0 1.5rem;
            margin-top: 2rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2rem;
        }
        .footer-grid h4 {
            color: #fff;
            margin-top: 0;
            font-size: 1.1rem;
        }
        .footer-grid a {
            color: #b0c8e0;
        }
        .footer-grid a:hover {
            color: #f5c842;
        }
        friend-link {
            display: block;
            margin-top: 0.8rem;
        }
        friend-link a {
            display: inline-block;
            padding: 0.3rem 0.8rem;
            margin: 0.2rem 0.2rem 0.2rem 0;
            background: rgba(255, 255, 255, 0.06);
            border-radius: 30px;
            font-size: 0.85rem;
            border: 1px solid rgba(255, 255, 255, 0.08);
        }
        friend-link a:hover {
            background: rgba(255, 255, 255, 0.12);
            text-decoration: none;
        }
        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            margin-top: 2rem;
            padding-top: 1.2rem;
            text-align: center;
            font-size: 0.85rem;
            color: #8aa4be;
        }
        .copyright strong {
            color: #d4e2f0;
        }
        @media (max-width: 992px) {
            .content-layout {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
                margin-top: 2rem;
            }
            .hero-grid {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .hero-grid .hero-text .hero-stats {
                justify-content: center;
            }
            .feedback-row {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .nav-list {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #0b1e2e;
                padding: 0.8rem 0.6rem;
                border-radius: 0 0 16px 16px;
                gap: 0.2rem;
                margin-top: 0.6rem;
            }
            .nav-list.open {
                display: flex;
            }
            .nav-list li a {
                padding: 0.6rem 1rem;
                width: 100%;
                border-radius: 8px;
            }
            .nav-wrapper {
                flex-wrap: wrap;
            }
            .header-inner {
                align-items: center;
            }
            h1 {
                font-size: 1.7rem;
            }
            h2 {
                font-size: 1.3rem;
            }
            .hero-text h1 {
                font-size: 1.9rem;
            }
            .hero-stats .stat {
                flex: 1 0 80px;
                padding: 0.6rem 0.8rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .search-form {
                flex-direction: column;
            }
            .search-form button {
                width: 100%;
                justify-content: center;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 0.8rem;
            }
            .my-logo {
                font-size: 1.3rem;
                padding: 0.2rem 0.8rem;
            }
            .my-logo span {
                font-size: 0.6rem;
            }
            .hero-text h1 {
                font-size: 1.5rem;
            }
            .insight-grid {
                grid-template-columns: 1fr 1fr;
            }
            .feedback-card {
                padding: 1.2rem;
            }
        }
        .author-note {
            display: flex;
            align-items: center;
            gap: 0.8rem;
            background: #f0f6fe;
            padding: 1rem 1.4rem;
            border-radius: 14px;
            margin: 1.8rem 0;
            border: 1px solid #d4e2f0;
        }
        .author-note i {
            font-size: 2rem;
            color: #0057a3;
        }
        .author-note .auth-info {
            font-size: 0.9rem;
        }
        .author-note .auth-info strong {
            color: #0b1e2e;
        }
        .last-updated {
            font-size: 0.85rem;
            color: #4d6a8a;
            background: #eaf1fa;
            display: inline-block;
            padding: 0.2rem 1rem;
            border-radius: 30px;
            margin-bottom: 0.8rem;
        }
        .toc-list {
            background: #f6faff;
            padding: 1.2rem 1.6rem;
            border-radius: 16px;
            border: 1px solid #dce6f0;
            margin: 1.5rem 0;
        }
        .toc-list ol {
            margin-bottom: 0;
            padding-left: 1.4rem;
        }
        .toc-list ol li {
            margin-bottom: 0.3rem;
        }
        .toc-list ol li a {
            font-weight: 500;
        }
        .faq-item {
            background: #fff;
            border-radius: 14px;
            border: 1px solid #e2ebf5;
            padding: 1rem 1.4rem;
            margin-bottom: 0.8rem;
        }
        .faq-item h4 {
            margin: 0 0 0.3rem;
            display: flex;
            gap: 0.5rem;
            align-items: center;
            cursor: pointer;
        }
        .faq-item p {
            margin-bottom: 0;
            color: #2b4663;
        }