*,
        *::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: #f4f7fc;
            color: #1a2634;
            line-height: 1.7;
            padding: 0;
            margin: 0;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: #1a6dd4;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: #e67e22;
            text-decoration: underline;
        }
        ul,
        ol {
            padding-left: 1.5rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, #0b2b3f 0%, #1a4a6b 100%);
            color: #fff;
            padding: 0.8rem 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: 1.6rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: #f5d742;
            text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
            transition: transform 0.2s;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .my-logo i {
            font-size: 1.8rem;
            color: #ffb347;
        }
        .my-logo:hover {
            transform: scale(1.02);
            color: #ffe270;
        }
        .my-logo small {
            font-size: 0.6rem;
            font-weight: 400;
            color: #bcd9f0;
            display: block;
            letter-spacing: 0.3px;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: 2px solid rgba(255, 255, 255, 0.4);
            color: #fff;
            font-size: 1.8rem;
            padding: 0.2rem 0.8rem;
            border-radius: 6px;
            cursor: pointer;
            transition: 0.2s;
        }
        .nav-toggle:hover {
            border-color: #f5d742;
            color: #f5d742;
        }
        .main-nav {
            display: flex;
            gap: 0.2rem;
            flex-wrap: wrap;
            align-items: center;
        }
        .main-nav a {
            color: #e8f0fe;
            padding: 0.5rem 1rem;
            border-radius: 30px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: 0.2s;
            white-space: nowrap;
        }
        .main-nav a:hover {
            background: rgba(255, 255, 255, 0.15);
            color: #f5d742;
            text-decoration: none;
        }
        .main-nav a i {
            margin-right: 6px;
            font-size: 0.85rem;
        }
        .breadcrumb {
            background: #e9eef3;
            padding: 0.6rem 0;
            font-size: 0.85rem;
            border-bottom: 1px solid #d0dae6;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin: 0 10px;
            color: #7f8c8d;
        }
        .breadcrumb a {
            color: #2c6fbb;
        }
        .breadcrumb .active {
            color: #4a5b6e;
            font-weight: 600;
        }
        main {
            padding: 2rem 0 3rem;
        }
        h1 {
            font-size: 2.2rem;
            font-weight: 800;
            color: #0b2b3f;
            margin-bottom: 0.8rem;
            line-height: 1.2;
            border-left: 6px solid #f5b342;
            padding-left: 1.2rem;
        }
        h1 i {
            color: #f5b342;
        }
        h2 {
            font-size: 1.7rem;
            font-weight: 700;
            color: #1a4a6b;
            margin: 2.4rem 0 1rem 0;
            padding-bottom: 0.4rem;
            border-bottom: 3px solid #e0e9f2;
        }
        h2 i {
            color: #e67e22;
            margin-right: 10px;
        }
        h3 {
            font-size: 1.3rem;
            font-weight: 600;
            color: #1f3a4f;
            margin: 1.8rem 0 0.8rem 0;
        }
        h3 i {
            color: #e67e22;
            margin-right: 8px;
        }
        h4 {
            font-size: 1.1rem;
            font-weight: 600;
            color: #2a4b66;
            margin: 1.2rem 0 0.5rem 0;
        }
        p {
            margin-bottom: 1.1rem;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            font-size: 0.9rem;
            color: #5a6f82;
            margin-bottom: 1.8rem;
            padding: 0.6rem 0;
            border-bottom: 1px dashed #cbd8e6;
        }
        .article-meta span i {
            margin-right: 6px;
        }
        .content-card {
            background: #fff;
            border-radius: 20px;
            padding: 2rem 2.2rem;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
            margin-bottom: 2.5rem;
        }
        .content-card img {
            border-radius: 16px;
            margin: 1.5rem auto;
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.08);
            max-width: 100%;
        }
        .feature-box {
            background: #f0f6fe;
            border-left: 6px solid #f5b342;
            padding: 1.2rem 1.6rem;
            border-radius: 0 16px 16px 0;
            margin: 1.5rem 0;
        }
        .feature-box i {
            color: #e67e22;
            margin-right: 8px;
        }
        .highlight {
            background: #fef9e7;
            padding: 0.2rem 0.6rem;
            border-radius: 6px;
            font-weight: 600;
        }
        .badge {
            display: inline-block;
            background: #1a4a6b;
            color: #fff;
            padding: 0.1rem 0.9rem;
            border-radius: 40px;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.3px;
        }
        .badge.gold {
            background: #f5b342;
            color: #1a2634;
        }
        .badge.green {
            background: #2e8b57;
        }
        .link-list-inline {
            display: flex;
            flex-wrap: wrap;
            gap: 0.4rem 1.2rem;
            list-style: none;
            padding: 0.8rem 0;
            margin: 1rem 0;
        }
        .link-list-inline li a {
            font-weight: 500;
        }
        .link-list-inline li a i {
            margin-right: 5px;
            font-size: 0.8rem;
        }
        .search-form {
            display: flex;
            max-width: 560px;
            margin: 1.2rem 0 1.8rem;
            border-radius: 60px;
            overflow: hidden;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
            border: 1px solid #dae2ed;
            background: #fff;
        }
        .search-form input {
            flex: 1;
            border: none;
            padding: 0.8rem 1.4rem;
            font-size: 1rem;
            outline: none;
            background: transparent;
        }
        .search-form button {
            background: #1a4a6b;
            color: #fff;
            border: none;
            padding: 0 1.8rem;
            font-size: 1.1rem;
            cursor: pointer;
            transition: 0.2s;
        }
        .search-form button:hover {
            background: #e67e22;
        }
        .user-feedback {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            margin: 2.5rem 0;
        }
        .feedback-card {
            background: #fff;
            border-radius: 18px;
            padding: 1.6rem 2rem;
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.04);
            border: 1px solid #e6edf5;
        }
        .feedback-card h3 {
            margin-top: 0;
            border-bottom: 2px solid #eef4fa;
            padding-bottom: 0.6rem;
        }
        .feedback-card form {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
        }
        .feedback-card textarea,
        .feedback-card input,
        .feedback-card select {
            padding: 0.7rem 1rem;
            border: 1px solid #d4e0ec;
            border-radius: 10px;
            font-size: 0.95rem;
            font-family: inherit;
            transition: 0.2s;
            background: #fafcff;
        }
        .feedback-card textarea:focus,
        .feedback-card input:focus,
        .feedback-card select:focus {
            border-color: #1a6dd4;
            box-shadow: 0 0 0 3px rgba(26, 109, 212, 0.1);
            outline: none;
        }
        .feedback-card textarea {
            min-height: 80px;
            resize: vertical;
        }
        .feedback-card .btn-submit {
            background: #1a4a6b;
            color: #fff;
            border: none;
            padding: 0.7rem 1.4rem;
            border-radius: 40px;
            font-weight: 600;
            cursor: pointer;
            transition: 0.2s;
            font-size: 0.95rem;
            align-self: flex-start;
        }
        .feedback-card .btn-submit:hover {
            background: #e67e22;
            transform: translateY(-2px);
        }
        .rating-stars {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-start;
            gap: 0.2rem;
        }
        .rating-stars input {
            display: none;
        }
        .rating-stars label {
            font-size: 2rem;
            color: #d0dae6;
            cursor: pointer;
            transition: 0.15s;
        }
        .rating-stars input:checked~label,
        .rating-stars label:hover,
        .rating-stars label:hover~label {
            color: #f5b342;
        }
        .related-links {
            background: #f0f6fe;
            border-radius: 18px;
            padding: 1.6rem 2rem;
            margin: 2rem 0;
            border: 1px solid #dce6f2;
        }
        .related-links h3 {
            margin-top: 0;
        }
        .related-links ul {
            columns: 2;
            column-gap: 2rem;
            list-style: none;
            padding: 0;
        }
        .related-links ul li {
            break-inside: avoid;
            margin-bottom: 0.4rem;
        }
        .related-links ul li a {
            display: block;
            padding: 0.3rem 0;
            font-weight: 500;
        }
        .related-links ul li a i {
            margin-right: 8px;
            color: #e67e22;
            font-size: 0.8rem;
        }
        .site-footer {
            background: #0b2b3f;
            color: #cbd8e6;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2.5rem;
            margin-bottom: 2rem;
        }
        .footer-grid h4 {
            color: #f5d742;
            margin-bottom: 1rem;
            font-size: 1.1rem;
        }
        .footer-grid a {
            color: #bcd9f0;
            display: block;
            padding: 0.2rem 0;
            font-size: 0.9rem;
        }
        .footer-grid a:hover {
            color: #f5d742;
        }
        friend-link {
            display: block;
            margin-top: 0.8rem;
            font-size: 0.9rem;
        }
        friend-link a {
            display: inline-block;
            margin-right: 1.2rem;
            padding: 0.2rem 0;
        }
        .copyright {
            border-top: 1px solid #1f4a6b;
            padding-top: 1.5rem;
            text-align: center;
            font-size: 0.85rem;
            color: #8aa3bb;
        }
        .copyright strong {
            color: #f5d742;
        }
        @media (max-width: 992px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .user-feedback {
                grid-template-columns: 1fr;
            }
            .related-links ul {
                columns: 1;
            }
        }
        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: flex-start;
                padding: 1rem 0 0.5rem;
                gap: 0.2rem;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                width: 100%;
                padding: 0.6rem 0.8rem;
                border-radius: 8px;
            }
            .header-inner {
                align-items: center;
            }
            h1 {
                font-size: 1.6rem;
                padding-left: 0.8rem;
            }
            h2 {
                font-size: 1.35rem;
            }
            h3 {
                font-size: 1.1rem;
            }
            .content-card {
                padding: 1.2rem 1.2rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .search-form {
                max-width: 100%;
                flex-direction: column;
                border-radius: 16px;
            }
            .search-form input {
                padding: 0.8rem 1rem;
            }
            .search-form button {
                padding: 0.7rem;
            }
            .rating-stars label {
                font-size: 1.6rem;
            }
            .my-logo {
                font-size: 1.2rem;
            }
            .my-logo small {
                font-size: 0.5rem;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 12px;
            }
            .content-card {
                padding: 0.8rem 0.8rem;
            }
            h1 {
                font-size: 1.3rem;
            }
            .breadcrumb {
                font-size: 0.75rem;
            }
            .article-meta {
                font-size: 0.78rem;
                gap: 0.4rem;
            }
        }
        .schema-hidden {
            display: none;
        }
        .emoji-lg {
            font-size: 1.4rem;
        }
        .text-muted {
            color: #5a6f82;
        }
        .mt-2 {
            margin-top: 1.2rem;
        }
        .mb-1 {
            margin-bottom: 0.6rem;
        }
        .flex-center {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .img-caption {
            text-align: center;
            font-size: 0.85rem;
            color: #4f6b82;
            margin-top: -0.8rem;
            margin-bottom: 1.2rem;
            font-style: italic;
        }
        :target {
            scroll-margin-top: 90px;
        }