*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            background: #f0f8ff;
            color: #1e2a3a;
            line-height: 1.7;
            padding: 0 0 0 0;
        }
        a {
            color: #0a6b8c;
            text-decoration: none;
            transition: color 0.2s, border-bottom 0.2s;
        }
        a:hover {
            color: #e67e22;
            border-bottom: 1px solid #e67e22;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        ul,
        ol {
            padding-left: 1.5rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.2rem;
        }
        .site-header {
            background: linear-gradient(135deg, #0a3d62, #0a6b8c);
            color: #fff;
            padding: 0.8rem 0;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 4px 16px 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(to right, #f9d423, #f0a500);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-shadow: none;
        }
        .my-logo i {
            -webkit-text-fill-color: #f0a500;
            margin-right: 4px;
        }
        .my-logo:hover {
            border-bottom: none;
            opacity: 0.9;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.2rem 0.4rem;
        }
        .nav-menu {
            display: flex;
            gap: 0.3rem 1.2rem;
            flex-wrap: wrap;
            align-items: center;
            list-style: none;
            padding: 0;
        }
        .nav-menu li a {
            color: #e0f0ff;
            font-weight: 500;
            padding: 0.3rem 0.6rem;
            border-radius: 6px;
            font-size: 0.95rem;
            transition: background 0.2s, color 0.2s;
            border-bottom: none;
        }
        .nav-menu li a:hover {
            background: rgba(255, 255, 255, 0.15);
            color: #f9d423;
            border-bottom: none;
        }
        .nav-menu li a.active {
            color: #f9d423;
            border-bottom: 2px solid #f9d423;
        }
        .breadcrumb {
            background: #e8f4f8;
            padding: 0.6rem 0;
            font-size: 0.9rem;
            border-bottom: 1px solid #d0e4ed;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            padding: 0;
            gap: 0.4rem;
        }
        .breadcrumb ol li+li::before {
            content: "›";
            padding: 0 0.5rem;
            color: #7f8c8d;
        }
        .breadcrumb a {
            color: #0a6b8c;
        }
        .breadcrumb .current {
            color: #2d3436;
            font-weight: 600;
        }
        main {
            padding: 2.2rem 0 3rem;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
        }
        @media(max-width:920px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
        }
        article h1 {
            font-size: 2.4rem;
            font-weight: 800;
            color: #0a3d62;
            margin-bottom: 0.3rem;
            line-height: 1.2;
        }
        article .subhead {
            font-size: 1.1rem;
            color: #4a6a7a;
            margin-bottom: 1.2rem;
            border-left: 4px solid #f0a500;
            padding-left: 1rem;
        }
        .meta-line {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem 1.8rem;
            font-size: 0.9rem;
            color: #5d6d7e;
            margin-bottom: 1.8rem;
            padding-bottom: 1rem;
            border-bottom: 1px solid #d0e4ed;
        }
        .meta-line i {
            margin-right: 4px;
            color: #0a6b8c;
        }
        .last-updated {
            font-weight: 600;
            color: #0a3d62;
        }
        article h2 {
            font-size: 1.8rem;
            font-weight: 700;
            color: #0a3d62;
            margin-top: 2.8rem;
            margin-bottom: 1rem;
            padding-bottom: 0.4rem;
            border-bottom: 3px solid #f0a500;
        }
        article h3 {
            font-size: 1.35rem;
            font-weight: 700;
            color: #0a6b8c;
            margin-top: 2rem;
            margin-bottom: 0.6rem;
        }
        article h4 {
            font-size: 1.1rem;
            font-weight: 700;
            color: #1e2a3a;
            margin-top: 1.4rem;
            margin-bottom: 0.4rem;
        }
        article p {
            margin-bottom: 1rem;
        }
        article ul,
        article ol {
            margin-bottom: 1.2rem;
        }
        article li {
            margin-bottom: 0.3rem;
        }
        .highlight-box {
            background: #e6f3fa;
            border-left: 5px solid #0a6b8c;
            padding: 1.2rem 1.5rem;
            border-radius: 8px;
            margin: 1.6rem 0;
        }
        .highlight-box strong {
            color: #0a3d62;
        }
        .emoji-big {
            font-size: 1.3rem;
        }
        .feature-image {
            margin: 2rem 0;
            border-radius: 14px;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
        }
        .feature-image figcaption {
            font-size: 0.85rem;
            color: #5d6d7e;
            margin-top: 0.5rem;
            text-align: center;
            font-style: italic;
        }
        .sidebar {
            background: #ffffff;
            border-radius: 16px;
            padding: 1.5rem 1.2rem;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
            border: 1px solid #e0edf4;
            height: fit-content;
            position: sticky;
            top: 80px;
        }
        .sidebar h3 {
            font-size: 1.2rem;
            color: #0a3d62;
            border-bottom: 2px solid #f0a500;
            padding-bottom: 0.4rem;
            margin-bottom: 1rem;
        }
        .sidebar ul {
            list-style: none;
            padding: 0;
        }
        .sidebar ul li {
            margin-bottom: 0.5rem;
        }
        .sidebar ul li a {
            color: #0a6b8c;
            font-weight: 500;
            border-bottom: none;
        }
        .sidebar ul li a:hover {
            color: #e67e22;
            border-bottom: none;
        }
        .sidebar .code-block {
            background: #f4f9fc;
            padding: 0.4rem 0.8rem;
            border-radius: 6px;
            font-family: monospace;
            font-size: 0.9rem;
            color: #0a3d62;
            border: 1px solid #d0e4ed;
            display: inline-block;
        }
        .search-section {
            background: #ffffff;
            border-radius: 16px;
            padding: 2rem;
            margin: 2.5rem 0;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
            border: 1px solid #e0edf4;
        }
        .search-section h2 {
            margin-top: 0;
            border-bottom: none;
            font-size: 1.6rem;
        }
        .search-form {
            display: flex;
            gap: 0.6rem;
            flex-wrap: wrap;
            margin-top: 0.8rem;
        }
        .search-form input[type="text"] {
            flex: 1 1 240px;
            padding: 0.8rem 1.2rem;
            border: 2px solid #d0e4ed;
            border-radius: 40px;
            font-size: 1rem;
            outline: none;
            transition: border-color 0.3s;
        }
        .search-form input[type="text"]:focus {
            border-color: #0a6b8c;
        }
        .search-form button {
            background: #0a6b8c;
            color: #fff;
            border: none;
            padding: 0.8rem 2rem;
            border-radius: 40px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
        }
        .search-form button:hover {
            background: #0a3d62;
            transform: scale(1.02);
        }
        .user-feedback {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.8rem;
            margin: 2.5rem 0;
        }
        @media(max-width:700px) {
            .user-feedback {
                grid-template-columns: 1fr;
            }
        }
        .feedback-card {
            background: #ffffff;
            border-radius: 16px;
            padding: 1.8rem 1.6rem;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
            border: 1px solid #e0edf4;
        }
        .feedback-card h3 {
            font-size: 1.3rem;
            color: #0a3d62;
            margin-top: 0;
            margin-bottom: 1rem;
            border-bottom: 2px solid #f0a500;
            padding-bottom: 0.3rem;
        }
        .feedback-card form {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
        }
        .feedback-card label {
            font-weight: 600;
            font-size: 0.95rem;
            color: #1e2a3a;
        }
        .feedback-card input,
        .feedback-card textarea,
        .feedback-card select {
            padding: 0.6rem 1rem;
            border: 2px solid #d0e4ed;
            border-radius: 10px;
            font-size: 0.95rem;
            outline: none;
            font-family: inherit;
            transition: border-color 0.3s;
        }
        .feedback-card input:focus,
        .feedback-card textarea:focus,
        .feedback-card select:focus {
            border-color: #0a6b8c;
        }
        .feedback-card textarea {
            min-height: 80px;
            resize: vertical;
        }
        .feedback-card .star-rating {
            display: flex;
            gap: 0.3rem;
            font-size: 1.6rem;
            color: #ddd;
            cursor: pointer;
            direction: rtl;
        }
        .feedback-card .star-rating input {
            display: none;
        }
        .feedback-card .star-rating label {
            color: #ddd;
            transition: color 0.2s;
            font-size: 1.6rem;
            cursor: pointer;
        }
        .feedback-card .star-rating input:checked~label,
        .feedback-card .star-rating label:hover,
        .feedback-card .star-rating label:hover~label {
            color: #f0a500;
        }
        .feedback-card .btn-submit {
            background: #f0a500;
            color: #1e2a3a;
            border: none;
            padding: 0.7rem 1.8rem;
            border-radius: 40px;
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            align-self: flex-start;
        }
        .feedback-card .btn-submit:hover {
            background: #d9910a;
            transform: scale(1.02);
        }
        .site-footer {
            background: #0a2a3a;
            color: #c0d4de;
            padding: 2.5rem 0 1.5rem;
            margin-top: 3rem;
            border-top: 4px solid #f0a500;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 2rem;
        }
        @media(max-width:700px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }
        .site-footer h4 {
            color: #f9d423;
            font-size: 1.1rem;
            margin-bottom: 0.6rem;
        }
        .site-footer a {
            color: #8bb9d0;
            border-bottom: none;
        }
        .site-footer a:hover {
            color: #f9d423;
            border-bottom: none;
        }
        friend-link {
            display: block;
            padding: 1rem 0;
            border-top: 1px solid #1a4a5a;
            margin-top: 1.2rem;
        }
        friend-link a {
            display: inline-block;
            margin: 0.2rem 0.6rem 0.2rem 0;
            padding: 0.2rem 0.8rem;
            background: rgba(255, 255, 255, 0.06);
            border-radius: 20px;
            font-size: 0.9rem;
            border: 1px solid rgba(255, 255, 255, 0.08);
        }
        .copyright {
            text-align: center;
            padding-top: 1.2rem;
            font-size: 0.85rem;
            color: #6a8a9a;
            border-top: 1px solid #1a4a5a;
            margin-top: 1rem;
        }
        @media(max-width:768px) {
            .nav-toggle {
                display: block;
            }
            .nav-menu {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #0a4a6a;
                padding: 1rem 0.8rem;
                border-radius: 0 0 12px 12px;
                margin-top: 0.6rem;
                gap: 0.4rem;
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-menu li a {
                padding: 0.5rem 0.8rem;
                display: block;
            }
            article h1 {
                font-size: 1.8rem;
            }
            article h2 {
                font-size: 1.4rem;
            }
            article h3 {
                font-size: 1.15rem;
            }
            .sidebar {
                position: relative;
                top: 0;
            }
        }
        @media(max-width:480px) {
            .container {
                padding: 0 0.8rem;
            }
            .my-logo {
                font-size: 1.4rem;
            }
            .search-form input[type="text"] {
                flex: 1 1 100%;
            }
            .search-form button {
                width: 100%;
            }
        }
        .anchor-offset {
            scroll-margin-top: 90px;
        }