*,
        *::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, Arial, sans-serif;
            background: #f6f8fc;
            color: #1a1e2b;
            line-height: 1.75;
            padding: 0 16px;
        }
        a {
            color: #1a6b8a;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover,
        a:focus {
            color: #0d3f55;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 10px;
        }
        .container {
            max-width: 1120px;
            margin: 0 auto;
            background: #ffffff;
            box-shadow: 0 0 30px rgba(0, 0, 0, 0.04);
            border-radius: 20px;
            padding: 20px 28px 40px;
            margin-top: 20px;
            margin-bottom: 40px;
        }
        @media (max-width: 640px) {
            body {
                padding: 0 8px;
            }
            .container {
                padding: 16px 14px 30px;
                border-radius: 14px;
                margin-top: 12px;
                margin-bottom: 24px;
            }
        }
        .site-header {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 12px 0 16px;
            border-bottom: 2px solid #e6edf4;
            position: relative;
        }
        .my-logo {
            font-size: 1.9rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #1a6b8a, #0d4f6b);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .my-logo i {
            font-size: 2rem;
            -webkit-text-fill-color: initial;
            color: #1a6b8a;
        }
        .my-logo:hover {
            opacity: 0.85;
            text-decoration: none;
        }
        .nav-wrapper {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .main-nav {
            display: flex;
            gap: 6px 18px;
            flex-wrap: wrap;
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .main-nav a {
            font-weight: 600;
            font-size: 0.95rem;
            padding: 4px 6px;
            border-radius: 6px;
            color: #1e2a3a;
            transition: background 0.2s, color 0.2s;
        }
        .main-nav a:hover {
            background: #e1ecf5;
            color: #0d3f55;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.7rem;
            color: #1a2a3a;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 8px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: #e1ecf5;
        }
        #nav-toggle {
            display: none;
        }
        @media (max-width: 780px) {
            .hamburger {
                display: inline-block;
            }
            .main-nav {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #ffffff;
                padding: 16px 12px 20px;
                border-radius: 0 0 16px 16px;
                box-shadow: 0 12px 24px rgba(0, 0, 0, 0.06);
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                z-index: 100;
                border: 1px solid #e6edf4;
                border-top: none;
                gap: 8px;
            }
            #nav-toggle:checked~.main-nav {
                display: flex;
            }
            .nav-wrapper {
                flex-wrap: wrap;
            }
            .main-nav a {
                padding: 10px 12px;
                font-size: 1.05rem;
                border-bottom: 1px solid #f0f4fa;
            }
            .main-nav li:last-child a {
                border-bottom: none;
            }
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 6px 10px;
            padding: 14px 0 10px;
            font-size: 0.85rem;
            color: #4a5b6b;
        }
        .breadcrumb a {
            color: #1a6b8a;
            font-weight: 500;
        }
        .breadcrumb i {
            font-size: 0.7rem;
            color: #8a9baa;
        }
        .breadcrumb .current {
            color: #2c3e50;
            font-weight: 600;
        }
        h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.2;
            margin: 0.5rem 0 1.2rem;
            color: #0b2a38;
            letter-spacing: -0.02em;
        }
        h2 {
            font-size: 1.9rem;
            font-weight: 700;
            margin: 2.2rem 0 0.8rem;
            padding-bottom: 6px;
            border-bottom: 3px solid #dde8f1;
            color: #0f3b4d;
        }
        h3 {
            font-size: 1.4rem;
            font-weight: 650;
            margin: 1.8rem 0 0.5rem;
            color: #154b60;
        }
        h4 {
            font-size: 1.15rem;
            font-weight: 600;
            margin: 1.4rem 0 0.4rem;
            color: #1d5d76;
        }
        p {
            margin-bottom: 1.1rem;
            color: #1e2a38;
        }
        .lead {
            font-size: 1.15rem;
            font-weight: 400;
            color: #2c4054;
            background: #f2f7fd;
            padding: 16px 22px;
            border-radius: 14px;
            border-left: 6px solid #1a6b8a;
            margin: 1.2rem 0 1.8rem;
        }
        strong,
        b {
            color: #0a2a37;
        }
        .highlight-box {
            background: #f0f7fe;
            border-radius: 14px;
            padding: 18px 24px;
            margin: 1.6rem 0;
            border: 1px solid #d4e3ef;
        }
        .emoji-lg {
            font-size: 1.3rem;
        }
        @media (max-width: 640px) {
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            h3 {
                font-size: 1.2rem;
            }
            .lead {
                font-size: 1rem;
                padding: 12px 16px;
            }
        }
        .search-block {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin: 24px 0 18px;
            padding: 16px 20px;
            background: #f3f8fe;
            border-radius: 14px;
            border: 1px solid #dce8f2;
        }
        .search-block label {
            font-weight: 600;
            font-size: 0.95rem;
            display: flex;
            align-items: center;
            gap: 8px;
            color: #1e3a4a;
        }
        .search-block input[type="search"] {
            flex: 1;
            min-width: 180px;
            padding: 10px 16px;
            border: 1px solid #cbdae7;
            border-radius: 30px;
            font-size: 0.95rem;
            background: #fff;
            outline: none;
            transition: border 0.2s;
        }
        .search-block input[type="search"]:focus {
            border-color: #1a6b8a;
            box-shadow: 0 0 0 3px rgba(26, 107, 138, 0.15);
        }
        .search-block button {
            background: #1a6b8a;
            color: #fff;
            border: none;
            padding: 10px 26px;
            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: 8px;
        }
        .search-block button:hover {
            background: #0d4f6b;
            transform: scale(1.02);
        }
        .search-block button:active {
            transform: scale(0.97);
        }
        @media (max-width: 500px) {
            .search-block {
                flex-direction: column;
            }
            .search-block button {
                justify-content: center;
            }
        }
        .feature-img {
            margin: 1.8rem 0 2.2rem;
            border-radius: 14px;
            overflow: hidden;
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.06);
        }
        .feature-img img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
            background: #dde8f1;
        }
        .feature-img figcaption {
            padding: 10px 16px;
            font-size: 0.85rem;
            color: #3a5165;
            background: #f6faff;
            border-top: 1px solid #e0eaf3;
            font-style: italic;
        }
        .link-list-inline {
            display: flex;
            flex-wrap: wrap;
            gap: 8px 18px;
            list-style: none;
            padding: 8px 0 12px;
            margin: 14px 0;
        }
        .link-list-inline li a {
            font-weight: 500;
            background: #eef5fb;
            padding: 4px 14px;
            border-radius: 30px;
            font-size: 0.9rem;
            border: 1px solid #d4e3ef;
            transition: background 0.2s, border 0.2s;
            display: inline-block;
        }
        .link-list-inline li a:hover {
            background: #d4e3ef;
            border-color: #1a6b8a;
            text-decoration: none;
        }
        .interaction-section {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
            margin: 2.8rem 0 1.6rem;
            padding-top: 20px;
            border-top: 2px solid #e6edf4;
        }
        .comment-block,
        .rating-block {
            background: #f7faff;
            padding: 20px 22px;
            border-radius: 16px;
            border: 1px solid #dce8f2;
        }
        .comment-block h3,
        .rating-block h3 {
            margin-top: 0;
            font-size: 1.25rem;
            border-bottom: none;
            padding-bottom: 0;
        }
        .comment-block form,
        .rating-block form {
            display: flex;
            flex-direction: column;
            gap: 12px;
            margin-top: 8px;
        }
        .comment-block input,
        .comment-block textarea,
        .rating-block input,
        .rating-block select {
            padding: 10px 14px;
            border: 1px solid #cbdae7;
            border-radius: 10px;
            font-size: 0.95rem;
            font-family: inherit;
            background: #fff;
            outline: none;
            transition: border 0.2s;
        }
        .comment-block input:focus,
        .comment-block textarea:focus,
        .rating-block input:focus,
        .rating-block select:focus {
            border-color: #1a6b8a;
            box-shadow: 0 0 0 3px rgba(26, 107, 138, 0.1);
        }
        .comment-block textarea {
            min-height: 90px;
            resize: vertical;
        }
        .comment-block button,
        .rating-block button {
            background: #1a6b8a;
            color: #fff;
            border: none;
            padding: 10px 22px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            align-self: flex-start;
        }
        .comment-block button:hover,
        .rating-block button:hover {
            background: #0d4f6b;
            transform: scale(1.02);
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 4px;
            font-size: 1.8rem;
            color: #d0dae6;
            cursor: pointer;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            cursor: pointer;
            transition: color 0.15s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f5b342;
        }
        @media (max-width: 700px) {
            .interaction-section {
                grid-template-columns: 1fr;
            }
        }
        friend-link {
            display: block;
            margin: 2.2rem 0 0.8rem;
            padding: 20px 20px 16px;
            background: #edf3fa;
            border-radius: 16px;
            border: 1px solid #d4e3ef;
        }
        friend-link::before {
            content: "🔗 Friendly Links";
            display: block;
            font-weight: 700;
            font-size: 1.1rem;
            color: #0b2a38;
            margin-bottom: 12px;
        }
        friend-link a {
            display: inline-block;
            margin: 4px 12px 4px 0;
            padding: 4px 12px;
            background: #ffffff;
            border-radius: 30px;
            font-size: 0.9rem;
            border: 1px solid #cbdae7;
            transition: background 0.2s, border 0.2s;
        }
        friend-link a:hover {
            background: #d4e3ef;
            border-color: #1a6b8a;
            text-decoration: none;
        }
        .site-footer {
            margin-top: 32px;
            padding: 24px 0 12px;
            border-top: 2px solid #e6edf4;
            text-align: center;
            font-size: 0.9rem;
            color: #3a5165;
        }
        .site-footer .copyright {
            font-weight: 500;
            letter-spacing: 0.3px;
            margin-top: 6px;
        }
        .site-footer a {
            font-weight: 500;
        }
        .schema-hidden {
            display: none;
        }
        .badge {
            display: inline-block;
            background: #1a6b8a;
            color: #fff;
            font-size: 0.7rem;
            font-weight: 700;
            padding: 2px 12px;
            border-radius: 30px;
            letter-spacing: 0.5px;
            text-transform: uppercase;
        }
        .last-updated {
            display: block;
            font-size: 0.85rem;
            color: #4a6a7a;
            margin: 6px 0 12px;
            font-style: italic;
        }
        .last-updated i {
            margin-right: 4px;
        }
        .toc {
            background: #f2f7fd;
            border-radius: 14px;
            padding: 16px 22px 18px;
            margin: 1.6rem 0 2rem;
            border: 1px solid #d4e3ef;
        }
        .toc h3 {
            margin-top: 0;
            font-size: 1.2rem;
        }
        .toc ol {
            padding-left: 24px;
            margin: 6px 0 0;
        }
        .toc li {
            margin: 4px 0;
        }
        .toc a {
            font-weight: 500;
        }
        .btn-top {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: #edf3fa;
            padding: 6px 18px;
            border-radius: 30px;
            font-size: 0.85rem;
            font-weight: 500;
            margin: 12px 0 4px;
            border: 1px solid #d4e3ef;
            transition: background 0.2s;
        }
        .btn-top:hover {
            background: #d4e3ef;
            text-decoration: none;
        }
        @media (max-width: 640px) {
            .toc ol {
                padding-left: 18px;
            }
        }
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        @media (max-width: 600px) {
            .grid-2 {
                grid-template-columns: 1fr;
            }
        }
        .flex-center {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .mt-1 {
            margin-top: 0.8rem;
        }
        .mb-1 {
            margin-bottom: 0.8rem;
        }