*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, Roboto, 'Helvetica Neue', sans-serif;
            background: #f8faff;
            color: #1a2634;
            line-height: 1.7;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a {
            color: #1e6f9f;
            text-decoration: none;
            transition: color 0.25s ease;
        }
        a:hover,
        a:focus {
            color: #0d3b5c;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        ul,
        ol {
            padding-left: 1.5rem;
            margin: 1rem 0;
        }
        li {
            margin-bottom: 0.4rem;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.25;
            color: #0a1a2b;
            font-weight: 700;
            margin-top: 1.8rem;
            margin-bottom: 0.6rem;
        }
        h1 {
            font-size: 2.4rem;
            margin-top: 0.2rem;
        }
        h2 {
            font-size: 1.8rem;
            border-bottom: 3px solid #dce7f5;
            padding-bottom: 0.3rem;
        }
        h3 {
            font-size: 1.4rem;
            color: #123b5e;
        }
        h4 {
            font-size: 1.15rem;
            color: #1f4a6e;
            font-weight: 600;
        }
        p {
            margin: 1rem 0;
        }
        .container {
            max-width: 1140px;
            margin: 0 auto;
            padding: 0 20px;
            width: 100%;
        }
        .site-header {
            background: linear-gradient(135deg, #0a1a2b 0%, #1a3a55 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;
            gap: 0.6rem 1.2rem;
        }
        .my-logo {
            font-size: 1.6rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(to right, #f9d976, #f39c12);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-shadow: 0 0 30px rgba(243, 156, 18, 0.15);
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
        }
        .my-logo i {
            -webkit-text-fill-color: initial;
            color: #f9d976;
            font-size: 1.8rem;
        }
        .my-logo:hover {
            opacity: 0.9;
            text-decoration: none;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: 2px solid rgba(255, 255, 255, 0.3);
            color: #fff;
            font-size: 1.6rem;
            padding: 0.3rem 0.7rem;
            border-radius: 8px;
            cursor: pointer;
            transition: background 0.2s;
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.08);
        }
        .primary-nav {
            display: flex;
            flex-wrap: wrap;
            gap: 0.2rem 0.8rem;
            align-items: center;
        }
        .primary-nav a {
            color: #e0edf9;
            font-weight: 500;
            font-size: 0.92rem;
            padding: 0.4rem 0.7rem;
            border-radius: 6px;
            transition: background 0.2s, color 0.2s;
            white-space: nowrap;
        }
        .primary-nav a:hover,
        .primary-nav a:focus {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            text-decoration: none;
        }
        .breadcrumb-wrap {
            background: #edf3fa;
            padding: 0.6rem 0;
            border-bottom: 1px solid #dce7f5;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            gap: 0.3rem 0.6rem;
            font-size: 0.87rem;
            color: #3a5770;
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 0.5rem;
            color: #8aa3bb;
            font-weight: 700;
        }
        .breadcrumb a {
            color: #1e6f9f;
        }
        .breadcrumb .current {
            color: #0a1a2b;
            font-weight: 600;
        }
        .main-content {
            flex: 1;
            padding: 2rem 0 3rem;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
        }
        @media(max-width:860px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
        }
        .article-body {
            background: #fff;
            padding: 2rem 2.2rem;
            border-radius: 18px;
            box-shadow: 0 2px 24px rgba(0, 0, 0, 0.04);
            border: 1px solid #eaf0f7;
        }
        @media(max-width:600px) {
            .article-body {
                padding: 1.2rem 1rem;
            }
            h1 {
                font-size: 1.7rem;
            }
            h2 {
                font-size: 1.35rem;
            }
            h3 {
                font-size: 1.15rem;
            }
            .header-inner {
                flex-direction: row;
            }
            .primary-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                background: #0f2940;
                padding: 1rem;
                border-radius: 12px;
                margin-top: 0.5rem;
            }
            .primary-nav.show {
                display: flex;
            }
            .nav-toggle {
                display: inline-block;
            }
        }
        @media(min-width:601px) {
            .primary-nav {
                display: flex !important;
            }
            .nav-toggle {
                display: none !important;
            }
        }
        .featured-image {
            margin: 1.8rem 0;
            border-radius: 14px;
            overflow: hidden;
            background: #eaf0f7;
            text-align: center;
        }
        .featured-image img {
            width: 100%;
            max-height: 420px;
            object-fit: cover;
        }
        .featured-image figcaption {
            padding: 0.6rem 1rem;
            font-size: 0.85rem;
            color: #3a5770;
            background: #f0f5fc;
        }
        .last-updated {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 0.9rem;
            color: #3a5770;
            background: #f0f5fc;
            padding: 0.3rem 1rem 0.3rem 0.8rem;
            border-radius: 30px;
            margin-bottom: 1rem;
        }
        .last-updated i {
            color: #1e6f9f;
        }
        .toc {
            background: #f4f8fe;
            border: 1px solid #dce7f5;
            border-radius: 14px;
            padding: 1.2rem 1.8rem;
            margin: 1.8rem 0;
        }
        .toc strong {
            font-size: 1.1rem;
            display: block;
            margin-bottom: 0.5rem;
            color: #0a1a2b;
        }
        .toc ul {
            list-style: none;
            padding: 0;
            margin: 0;
            columns: 2;
            column-gap: 2rem;
        }
        .toc li {
            margin-bottom: 0.3rem;
        }
        .toc a {
            color: #1e6f9f;
            font-weight: 500;
        }
        @media(max-width:500px) {
            .toc ul {
                columns: 1;
            }
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 1.8rem;
        }
        .sidebar-card {
            background: #fff;
            padding: 1.4rem 1.6rem;
            border-radius: 14px;
            box-shadow: 0 2px 16px rgba(0, 0, 0, 0.03);
            border: 1px solid #eaf0f7;
        }
        .sidebar-card h3 {
            font-size: 1.1rem;
            margin-top: 0;
            margin-bottom: 0.8rem;
            border-bottom: 2px solid #dce7f5;
            padding-bottom: 0.4rem;
        }
        .sidebar-link-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .sidebar-link-list li {
            margin-bottom: 0.5rem;
            border-bottom: 1px solid #f0f5fc;
            padding-bottom: 0.4rem;
        }
        .sidebar-link-list li:last-child {
            border-bottom: none;
        }
        .sidebar-link-list a {
            font-weight: 500;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .sidebar-link-list a i {
            font-size: 0.75rem;
            color: #8aa3bb;
        }
        .search-form {
            display: flex;
            gap: 0.5rem;
            margin: 1.2rem 0;
        }
        .search-form input[type="text"] {
            flex: 1;
            padding: 0.65rem 1rem;
            border: 2px solid #dce7f5;
            border-radius: 30px;
            font-size: 0.95rem;
            outline: none;
            transition: border-color 0.2s;
            background: #fafcff;
        }
        .search-form input[type="text"]:focus {
            border-color: #1e6f9f;
        }
        .search-form button {
            background: #1e6f9f;
            color: #fff;
            border: none;
            padding: 0.65rem 1.4rem;
            border-radius: 30px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
        }
        .search-form button:hover {
            background: #0d3b5c;
            transform: scale(1.02);
        }
        .feedback-section {
            margin-top: 2.5rem;
            padding-top: 2rem;
            border-top: 2px solid #eaf0f7;
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.8rem;
        }
        @media(max-width:640px) {
            .feedback-grid {
                grid-template-columns: 1fr;
            }
        }
        .feedback-card {
            background: #f8faff;
            padding: 1.4rem 1.6rem;
            border-radius: 14px;
            border: 1px solid #eaf0f7;
        }
        .feedback-card h3 {
            margin-top: 0;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .feedback-card form {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
            margin-top: 0.6rem;
        }
        .feedback-card label {
            font-weight: 600;
            font-size: 0.9rem;
            color: #1a3a55;
        }
        .feedback-card input,
        .feedback-card textarea,
        .feedback-card select {
            padding: 0.6rem 1rem;
            border: 2px solid #dce7f5;
            border-radius: 10px;
            font-size: 0.92rem;
            background: #fff;
            outline: none;
            transition: border-color 0.2s;
            font-family: inherit;
            width: 100%;
        }
        .feedback-card input:focus,
        .feedback-card textarea:focus,
        .feedback-card select:focus {
            border-color: #1e6f9f;
        }
        .feedback-card textarea {
            min-height: 80px;
            resize: vertical;
        }
        .feedback-card .btn-submit {
            background: #1e6f9f;
            color: #fff;
            border: none;
            padding: 0.65rem 1.4rem;
            border-radius: 30px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            justify-content: center;
            width: fit-content;
        }
        .feedback-card .btn-submit:hover {
            background: #0d3b5c;
            transform: scale(1.02);
        }
        .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: #dce7f5;
            transition: color 0.2s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f39c12;
        }
        .site-footer {
            background: #0a1a2b;
            color: #c8d8e8;
            padding: 2.5rem 0 1.8rem;
            margin-top: 2.5rem;
            border-top: 4px solid #1e6f9f;
        }
        .footer-inner {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2rem;
        }
        @media(max-width:700px) {
            .footer-inner {
                grid-template-columns: 1fr;
            }
        }
        .footer-inner h4 {
            color: #f9d976;
            margin-top: 0;
            font-size: 1rem;
            border-bottom: 1px solid #1f4a6e;
            padding-bottom: 0.4rem;
        }
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links li {
            margin-bottom: 0.3rem;
        }
        .footer-links a {
            color: #b0c8dd;
            font-size: 0.9rem;
        }
        .footer-links a:hover {
            color: #f9d976;
        }
        .footer-copy {
            grid-column: 1 / -1;
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #1f4a6e;
            margin-top: 1.5rem;
            font-size: 0.85rem;
            color: #6f8aa3;
        }
        friend-link {
            display: block;
            background: #112233;
            padding: 1.2rem 1.6rem;
            border-radius: 12px;
            margin: 1.2rem 0 0.6rem;
            border: 1px solid #1f4a6e;
        }
        friend-link a {
            color: #b0c8dd;
            font-size: 0.92rem;
            display: inline-block;
            margin: 0.2rem 0.6rem 0.2rem 0;
            padding: 0.2rem 0.6rem;
            background: rgba(255, 255, 255, 0.04);
            border-radius: 6px;
            transition: background 0.2s, color 0.2s;
        }
        friend-link a:hover {
            background: rgba(255, 255, 255, 0.1);
            color: #f9d976;
            text-decoration: none;
        }
        friend-link::before {
            content: "🔗 Friendly Links";
            display: block;
            font-weight: 700;
            color: #f9d976;
            font-size: 0.9rem;
            margin-bottom: 0.5rem;
            letter-spacing: 0.5px;
        }
        .highlight {
            background: #fef9e7;
            padding: 0.1rem 0.3rem;
            border-radius: 4px;
            font-weight: 600;
        }
        .emoji-big {
            font-size: 1.3em;
        }
        .text-muted {
            color: #4a6a85;
        }
        .mt-1 {
            margin-top: 1rem;
        }
        .mb-1 {
            margin-bottom: 1rem;
        }
        .flex-between {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 0.6rem;
        }
        .inline-icon {
            margin-right: 0.3rem;
        }
        @media(max-width:480px) {
            .article-body {
                padding: 1rem 0.8rem;
            }
            .sidebar-card {
                padding: 1rem;
            }
            .feedback-card {
                padding: 1rem;
            }
            .search-form {
                flex-direction: column;
            }
            .search-form button {
                width: 100%;
                justify-content: center;
            }
        }