*,
        *::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, BlinkMacSystemFont, Roboto, 'Helvetica Neue', Arial, sans-serif;
            background: #f8f9fc;
            color: #1e293b;
            line-height: 1.7;
            padding: 0;
            margin: 0;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: #2563eb;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: #1d4ed8;
            text-decoration: underline;
        }
        ul,
        ol {
            padding-left: 1.5rem;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.25;
            color: #0f172a;
            margin-bottom: 0.75rem;
        }
        h1 {
            font-size: 2.25rem;
            margin-top: 0;
        }
        h2 {
            font-size: 1.75rem;
            margin-top: 2.5rem;
            border-bottom: 2px solid #e2e8f0;
            padding-bottom: 0.4rem;
        }
        h3 {
            font-size: 1.35rem;
            margin-top: 1.75rem;
        }
        h4 {
            font-size: 1.1rem;
            margin-top: 1.25rem;
            font-weight: 600;
        }
        p {
            margin-bottom: 1.1rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.25rem;
        }
        .site-header {
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
            color: #f1f5f9;
            padding: 0.75rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.25);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 0.75rem;
        }
        .my-logo {
            font-size: 1.6rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: #facc15;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .my-logo i {
            font-size: 1.8rem;
            color: #f97316;
        }
        .my-logo:hover {
            color: #fde047;
            text-decoration: none;
        }
        .my-logo span {
            font-weight: 300;
            color: #94a3b8;
            font-size: 0.85rem;
            margin-left: 0.3rem;
        }
        .nav-wrapper {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .nav-list {
            display: flex;
            list-style: none;
            gap: 0.25rem;
            padding: 0;
            margin: 0;
        }
        .nav-list li a {
            display: block;
            padding: 0.5rem 0.9rem;
            color: #cbd5e1;
            font-size: 0.9rem;
            font-weight: 500;
            border-radius: 6px;
            transition: background 0.2s, color 0.2s;
        }
        .nav-list li a:hover {
            background: rgba(255, 255, 255, 0.1);
            color: #facc15;
            text-decoration: none;
        }
        .nav-list li a.active {
            color: #facc15;
            background: rgba(250, 204, 21, 0.12);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: #f1f5f9;
            font-size: 1.6rem;
            cursor: pointer;
            padding: 0.25rem 0.5rem;
            border-radius: 4px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: rgba(255, 255, 255, 0.08);
        }
        .nav-check {
            display: none;
        }
        .breadcrumb-wrap {
            background: #eef2f6;
            padding: 0.5rem 0;
            border-bottom: 1px solid #e2e8f0;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 0.3rem;
            font-size: 0.85rem;
            color: #475569;
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin: 0 0.4rem;
            color: #94a3b8;
        }
        .breadcrumb a {
            color: #2563eb;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb .current {
            color: #1e293b;
            font-weight: 600;
        }
        .main-wrap {
            padding: 2rem 0 3rem;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
        }
        @media(min-width:992px) {
            .content-grid {
                grid-template-columns: 1fr 300px;
            }
        }
        .article-body {
            background: #ffffff;
            border-radius: 16px;
            padding: 2rem 2.2rem;
            box-shadow: 0 1px 12px rgba(0, 0, 0, 0.05);
        }
        @media(max-width:600px) {
            .article-body {
                padding: 1.25rem 1rem;
            }
            h1 {
                font-size: 1.6rem;
            }
            h2 {
                font-size: 1.35rem;
            }
            h3 {
                font-size: 1.15rem;
            }
        }
        .last-updated {
            display: inline-block;
            background: #f1f5f9;
            padding: 0.3rem 1rem;
            border-radius: 30px;
            font-size: 0.8rem;
            color: #475569;
            margin-bottom: 1.25rem;
        }
        .last-updated i {
            margin-right: 0.4rem;
            color: #f97316;
        }
        .featured-img {
            border-radius: 14px;
            overflow: hidden;
            margin: 1.5rem 0 2rem;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
        }
        .featured-img img {
            width: 100%;
            height: auto;
            object-fit: cover;
        }
        .featured-img figcaption {
            background: #f8fafc;
            padding: 0.6rem 1rem;
            font-size: 0.85rem;
            color: #64748b;
            text-align: center;
            border-top: 1px solid #e2e8f0;
        }
        .highlight-box {
            background: #f0f9ff;
            border-left: 4px solid #2563eb;
            padding: 1rem 1.5rem;
            border-radius: 0 10px 10px 0;
            margin: 1.5rem 0;
        }
        .highlight-box p:last-child {
            margin-bottom: 0;
        }
        .emoji-big {
            font-size: 1.3rem;
            display: inline-block;
            margin-right: 0.2rem;
        }
        .link-list-inline {
            display: inline;
            padding: 0;
            margin: 0;
            list-style: none;
        }
        .link-list-inline li {
            display: inline;
        }
        .link-list-inline li+li::before {
            content: " · ";
            color: #94a3b8;
            margin: 0 0.2rem;
        }
        .sidebar {
            background: #ffffff;
            border-radius: 16px;
            padding: 1.5rem 1.5rem;
            box-shadow: 0 1px 12px rgba(0, 0, 0, 0.05);
            height: fit-content;
            position: sticky;
            top: 5.5rem;
        }
        .sidebar h3 {
            font-size: 1.1rem;
            margin-top: 0;
            border-bottom: 2px solid #e2e8f0;
            padding-bottom: 0.5rem;
            margin-bottom: 1rem;
        }
        .sidebar ul {
            list-style: none;
            padding: 0;
            margin: 0 0 1.5rem;
        }
        .sidebar ul li {
            padding: 0.3rem 0;
            border-bottom: 1px solid #f1f5f9;
        }
        .sidebar ul li a {
            font-size: 0.9rem;
        }
        .search-form {
            display: flex;
            margin-bottom: 1.5rem;
            border: 1px solid #e2e8f0;
            border-radius: 40px;
            overflow: hidden;
            background: #f8fafc;
            transition: border 0.2s;
        }
        .search-form:focus-within {
            border-color: #2563eb;
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
        }
        .search-form input {
            flex: 1;
            border: none;
            padding: 0.7rem 1.2rem;
            font-size: 0.95rem;
            background: transparent;
            outline: none;
            color: #1e293b;
        }
        .search-form button {
            background: #2563eb;
            color: #fff;
            border: none;
            padding: 0.7rem 1.2rem;
            cursor: pointer;
            font-size: 1rem;
            transition: background 0.2s;
        }
        .search-form button:hover {
            background: #1d4ed8;
        }
        .feedback-section {
            background: #ffffff;
            border-radius: 16px;
            padding: 2rem 2.2rem;
            box-shadow: 0 1px 12px rgba(0, 0, 0, 0.05);
            margin-top: 2rem;
        }
        @media(max-width:600px) {
            .feedback-section {
                padding: 1.25rem 1rem;
            }
        }
        .feedback-section h2 {
            margin-top: 0;
        }
        .comment-form textarea,
        .comment-form input {
            width: 100%;
            padding: 0.75rem 1rem;
            border: 1px solid #e2e8f0;
            border-radius: 10px;
            font-size: 0.95rem;
            font-family: inherit;
            transition: border 0.2s;
            background: #f8fafc;
            margin-bottom: 0.75rem;
        }
        .comment-form textarea:focus,
        .comment-form input:focus {
            border-color: #2563eb;
            outline: none;
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.08);
        }
        .comment-form textarea {
            min-height: 100px;
            resize: vertical;
        }
        .form-row {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
        }
        .form-row input {
            flex: 1;
            min-width: 180px;
        }
        .btn {
            display: inline-block;
            background: #2563eb;
            color: #fff;
            border: none;
            padding: 0.7rem 1.8rem;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
        }
        .btn:hover {
            background: #1d4ed8;
            transform: scale(1.01);
            text-decoration: none;
        }
        .btn-secondary {
            background: #475569;
        }
        .btn-secondary:hover {
            background: #334155;
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 0.15rem;
            margin: 0.5rem 0 1rem;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 1.8rem;
            color: #cbd5e1;
            cursor: pointer;
            transition: color 0.15s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #facc15;
        }
        .site-footer {
            background: #0f172a;
            color: #94a3b8;
            padding: 2.5rem 0 1.5rem;
            margin-top: 2rem;
        }
        .footer-inner {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 2rem;
        }
        .footer-col {
            flex: 1 1 220px;
        }
        .footer-col h4 {
            color: #f1f5f9;
            font-size: 1rem;
            margin-bottom: 0.75rem;
            border-bottom: 1px solid #1e293b;
            padding-bottom: 0.4rem;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            padding: 0.2rem 0;
        }
        .footer-col ul li a {
            color: #94a3b8;
            font-size: 0.88rem;
        }
        .footer-col ul li a:hover {
            color: #facc15;
            text-decoration: none;
        }
        friend-link {
            display: block;
            margin-top: 0.5rem;
        }
        friend-link a {
            color: #94a3b8;
            font-size: 0.88rem;
            display: inline-block;
            margin-right: 1rem;
        }
        friend-link a:hover {
            color: #facc15;
            text-decoration: none;
        }
        .copyright {
            border-top: 1px solid #1e293b;
            margin-top: 1.5rem;
            padding-top: 1.2rem;
            text-align: center;
            font-size: 0.82rem;
            color: #64748b;
        }
        .copyright a {
            color: #94a3b8;
        }
        @media(max-width:768px) {
            .nav-list {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #1e293b;
                border-radius: 12px;
                padding: 0.5rem 0;
                margin-top: 0.5rem;
                box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
            }
            .nav-list li a {
                padding: 0.7rem 1.2rem;
                border-radius: 0;
            }
            .hamburger {
                display: block;
            }
            .nav-check:checked~.nav-list {
                display: flex;
            }
            .nav-wrapper {
                flex-wrap: wrap;
            }
            .header-inner {
                gap: 0.5rem;
            }
            .sidebar {
                position: static;
            }
            .feedback-section .form-row {
                flex-direction: column;
            }
            .my-logo {
                font-size: 1.3rem;
            }
            .my-logo span {
                font-size: 0.7rem;
            }
        }
        @media(max-width:480px) {
            .container {
                padding: 0 0.9rem;
            }
            .article-body {
                padding: 1rem 0.8rem;
            }
            .feedback-section {
                padding: 1rem 0.8rem;
            }
            h1 {
                font-size: 1.4rem;
            }
            h2 {
                font-size: 1.2rem;
            }
            .star-rating label {
                font-size: 1.5rem;
            }
        }
        @media print {
            .site-header,
            .breadcrumb-wrap,
            .sidebar,
            .feedback-section .comment-form,
            .search-form,
            .hamburger {
                display: none;
            }
            body {
                background: #fff;
                color: #000;
            }
            .article-body {
                box-shadow: none;
                padding: 0;
            }
        }
        ::selection {
            background: #facc15;
            color: #0f172a;
        }
        .toc-list {
            list-style: none;
            padding: 0;
            margin: 1rem 0;
        }
        .toc-list li {
            padding: 0.25rem 0;
        }
        .toc-list li a {
            font-size: 0.92rem;
        }
        .toc-list li a::before {
            content: "📄 ";
            font-size: 0.8rem;
        }
        .inline-links {
            display: inline;
        }