*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Roboto, -apple-system, BlinkMacSystemFont, sans-serif;
            background: #f8fafc;
            color: #1e293b;
            line-height: 1.8;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        a {
            color: #0f3b5e;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #e67e22;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, #0f3b5e 0%, #1a5276 100%);
            color: #fff;
            padding: 16px 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;
            color: #fff;
            background: rgba(255, 255, 255, 0.12);
            padding: 6px 18px;
            border-radius: 40px;
            border: 2px solid rgba(255, 255, 255, 0.25);
            transition: 0.3s;
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i {
            color: #f1c40f;
            font-size: 1.6rem;
        }
        .my-logo:hover {
            background: rgba(255, 255, 255, 0.22);
            transform: scale(1.02);
            text-decoration: none;
            color: #fff;
        }
        .my-logo small {
            font-size: 0.7rem;
            font-weight: 400;
            opacity: 0.8;
            display: block;
            line-height: 1.2;
        }
        .nav-wrap {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .main-nav {
            display: flex;
            gap: 6px;
            flex-wrap: wrap;
        }
        .main-nav a {
            color: #e2e8f0;
            padding: 8px 16px;
            border-radius: 30px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: 0.25s;
            border: 1px solid transparent;
        }
        .main-nav a:hover {
            background: rgba(255, 255, 255, 0.15);
            color: #fff;
            border-color: rgba(255, 255, 255, 0.2);
            text-decoration: none;
        }
        .main-nav a i {
            margin-right: 6px;
            font-size: 0.85rem;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 4px 10px;
            border-radius: 8px;
            transition: 0.2s;
        }
        .hamburger:hover {
            background: rgba(255, 255, 255, 0.12);
        }
        .nav-toggle {
            display: none;
        }
        .breadcrumb {
            background: #e9edf2;
            padding: 10px 0;
            font-size: 0.85rem;
            border-bottom: 1px solid #dce1e8;
        }
        .breadcrumb ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 6px 12px;
            padding: 0 20px;
            max-width: 1200px;
            margin: 0 auto;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 12px;
            color: #888;
        }
        .breadcrumb a {
            color: #0f3b5e;
        }
        .breadcrumb .current {
            color: #64748b;
            font-weight: 600;
        }
        main {
            flex: 1;
            padding: 30px 0 50px;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 40px;
        }
        @media(min-width:992px) {
            .content-grid {
                grid-template-columns: 1fr 300px;
            }
        }
        .article-body h1 {
            font-size: 2.6rem;
            font-weight: 800;
            color: #0f3b5e;
            line-height: 1.2;
            margin-bottom: 12px;
            border-left: 6px solid #e67e22;
            padding-left: 20px;
        }
        .article-body .subhead {
            font-size: 1.1rem;
            color: #475569;
            margin-bottom: 28px;
            font-weight: 400;
        }
        .article-body .meta-info {
            display: flex;
            flex-wrap: wrap;
            gap: 16px 30px;
            font-size: 0.9rem;
            color: #64748b;
            margin-bottom: 30px;
            padding-bottom: 18px;
            border-bottom: 2px dashed #dce1e8;
        }
        .article-body .meta-info i {
            margin-right: 6px;
            color: #e67e22;
        }
        .article-body h2 {
            font-size: 2rem;
            font-weight: 700;
            color: #0f3b5e;
            margin-top: 50px;
            margin-bottom: 18px;
            padding-bottom: 8px;
            border-bottom: 3px solid #e67e22;
        }
        .article-body h3 {
            font-size: 1.5rem;
            font-weight: 600;
            color: #1a5276;
            margin-top: 36px;
            margin-bottom: 14px;
        }
        .article-body h4 {
            font-size: 1.2rem;
            font-weight: 600;
            color: #2c3e50;
            margin-top: 26px;
            margin-bottom: 10px;
        }
        .article-body p {
            margin-bottom: 18px;
            font-size: 1.05rem;
            color: #1e293b;
        }
        .article-body ul,
        .article-body ol {
            margin-bottom: 20px;
            padding-left: 28px;
        }
        .article-body li {
            margin-bottom: 8px;
            font-size: 1.02rem;
        }
        .article-body .highlight-box {
            background: #eef6fb;
            border-left: 5px solid #0f3b5e;
            padding: 20px 24px;
            border-radius: 0 12px 12px 0;
            margin: 24px 0;
        }
        .article-body .highlight-box strong {
            color: #0f3b5e;
        }
        .article-body .emoji-big {
            font-size: 1.8rem;
            margin-right: 8px;
        }
        .table-wrap {
            overflow-x: auto;
            margin: 24px 0 30px;
            border-radius: 12px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
        }
        .table-wrap table {
            width: 100%;
            border-collapse: collapse;
            background: #fff;
            font-size: 0.95rem;
        }
        .table-wrap th {
            background: #0f3b5e;
            color: #fff;
            padding: 14px 16px;
            text-align: left;
            font-weight: 600;
        }
        .table-wrap td {
            padding: 12px 16px;
            border-bottom: 1px solid #e9edf2;
        }
        .table-wrap tr:nth-child(even) {
            background: #f8fafc;
        }
        .table-wrap tr:hover {
            background: #eef6fb;
        }
        .featured-img {
            margin: 30px 0 32px;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.10);
            background: #fff;
            padding: 8px;
        }
        .featured-img img {
            border-radius: 12px;
            width: 100%;
            height: auto;
            object-fit: cover;
        }
        .featured-img figcaption {
            padding: 12px 16px 6px;
            font-size: 0.9rem;
            color: #64748b;
            font-style: italic;
            text-align: center;
        }
        .sidebar {
            background: #fff;
            border-radius: 16px;
            padding: 24px 20px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            align-self: start;
            position: sticky;
            top: 100px;
        }
        .sidebar h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: #0f3b5e;
            margin-bottom: 16px;
            border-bottom: 2px solid #e67e22;
            padding-bottom: 8px;
        }
        .sidebar ul {
            list-style: none;
            padding: 0;
        }
        .sidebar li {
            margin-bottom: 10px;
        }
        .sidebar a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 8px 12px;
            border-radius: 10px;
            background: #f8fafc;
            transition: 0.2s;
            font-size: 0.95rem;
        }
        .sidebar a:hover {
            background: #eef6fb;
            color: #0f3b5e;
            text-decoration: none;
            transform: translateX(4px);
        }
        .sidebar a i {
            color: #e67e22;
            width: 20px;
            text-align: center;
        }
        .interactive-section {
            display: grid;
            grid-template-columns: 1fr;
            gap: 30px;
            margin: 50px 0 40px;
            padding: 30px 0;
            border-top: 3px solid #e9edf2;
            border-bottom: 3px solid #e9edf2;
        }
        @media(min-width:768px) {
            .interactive-section {
                grid-template-columns: 1fr 1fr 1fr;
            }
        }
        .interactive-card {
            background: #fff;
            border-radius: 16px;
            padding: 24px 22px;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
            border: 1px solid #e9edf2;
        }
        .interactive-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: #0f3b5e;
            margin-bottom: 14px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .interactive-card h3 i {
            color: #e67e22;
        }
        .interactive-card form {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .interactive-card input,
        .interactive-card textarea,
        .interactive-card select {
            padding: 12px 16px;
            border-radius: 10px;
            border: 1.5px solid #dce1e8;
            font-size: 0.95rem;
            transition: 0.2s;
            font-family: inherit;
            background: #fafcff;
        }
        .interactive-card input:focus,
        .interactive-card textarea:focus,
        .interactive-card select:focus {
            outline: none;
            border-color: #0f3b5e;
            box-shadow: 0 0 0 3px rgba(15, 59, 94, 0.12);
        }
        .interactive-card textarea {
            resize: vertical;
            min-height: 80px;
        }
        .interactive-card .btn {
            background: #0f3b5e;
            color: #fff;
            border: none;
            padding: 12px 20px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: 0.25s;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }
        .interactive-card .btn:hover {
            background: #e67e22;
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(230, 126, 34, 0.3);
        }
        .interactive-card .btn i {
            font-size: 0.9rem;
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 4px;
            font-size: 1.8rem;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            cursor: pointer;
            color: #dce1e8;
            transition: 0.2s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f1c40f;
        }
        .site-footer {
            background: #0a2a40;
            color: #cbd5e1;
            padding: 40px 0 20px;
            margin-top: 40px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 30px;
            margin-bottom: 30px;
        }
        @media(min-width:768px) {
            .footer-grid {
                grid-template-columns: 2fr 1fr 1fr;
            }
        }
        .site-footer h4 {
            color: #fff;
            font-size: 1.1rem;
            margin-bottom: 14px;
            border-bottom: 2px solid #e67e22;
            padding-bottom: 6px;
            display: inline-block;
        }
        .site-footer a {
            color: #94a3b8;
        }
        .site-footer a:hover {
            color: #e67e22;
        }
        .friend-link {
            display: block;
            padding: 8px 0;
            font-size: 0.95rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }
        .friend-link a {
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .friend-link i {
            font-size: 0.8rem;
            color: #e67e22;
        }
        .copyright {
            text-align: center;
            padding-top: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            font-size: 0.85rem;
            color: #94a3b8;
        }
        .copyright strong {
            color: #e67e22;
        }
        @media(max-width:767px) {
            .header-inner {
                flex-wrap: wrap;
            }
            .hamburger {
                display: block;
            }
            .nav-wrap {
                width: 100%;
                flex-direction: column;
                align-items: stretch;
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.4s ease;
            }
            .nav-toggle:checked~.nav-wrap {
                max-height: 600px;
            }
            .main-nav {
                flex-direction: column;
                gap: 2px;
                padding: 12px 0 4px;
            }
            .main-nav a {
                padding: 10px 16px;
                border-radius: 8px;
            }
            .article-body h1 {
                font-size: 1.8rem;
                padding-left: 14px;
            }
            .article-body h2 {
                font-size: 1.5rem;
            }
            .article-body h3 {
                font-size: 1.25rem;
            }
            .my-logo {
                font-size: 1.4rem;
                padding: 4px 14px;
            }
            .sidebar {
                position: relative;
                top: 0;
            }
            .interactive-section {
                grid-template-columns: 1fr;
            }
            .breadcrumb ol {
                padding: 0 12px;
                font-size: 0.8rem;
            }
        }
        @media(min-width:768px) and (max-width:991px) {
            .article-body h1 {
                font-size: 2.2rem;
            }
            .content-grid {
                gap: 30px;
            }
        }
        .scroll-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: #0f3b5e;
            color: #fff;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
            transition: 0.3s;
            border: none;
            cursor: pointer;
            z-index: 99;
        }
        .scroll-top:hover {
            background: #e67e22;
            transform: translateY(-4px);
        }
        .mt-1 {
            margin-top: 10px;
        }
        .mb-1 {
            margin-bottom: 10px;
        }
        .text-muted {
            color: #64748b;
        }