*,
        *::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', Arial, sans-serif;
            line-height: 1.75;
            color: #1a1a2e;
            background: #f8f9fc;
            padding: 0 1rem;
        }
        a {
            color: #2b5f8a;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover,
        a:focus {
            color: #0d2b42;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        .container {
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 1rem;
        }
        h1 {
            font-size: 2.4rem;
            font-weight: 800;
            line-height: 1.25;
            margin: 1.5rem 0 0.75rem;
            color: #0d1b2a;
            letter-spacing: -0.02em;
        }
        h2 {
            font-size: 1.8rem;
            font-weight: 700;
            margin: 2.4rem 0 0.8rem;
            color: #1b2838;
            border-left: 5px solid #4a7c9b;
            padding-left: 1rem;
        }
        h3 {
            font-size: 1.35rem;
            font-weight: 600;
            margin: 1.8rem 0 0.5rem;
            color: #1f3a4b;
        }
        h4 {
            font-size: 1.1rem;
            font-weight: 600;
            margin: 1.2rem 0 0.4rem;
            color: #2b4b5e;
        }
        p {
            margin-bottom: 1.2rem;
            font-size: 1rem;
            color: #2c2c3a;
        }
        .lead {
            font-size: 1.2rem;
            font-weight: 400;
            color: #1f3a4b;
            background: #eef3f7;
            padding: 1.2rem 1.8rem;
            border-radius: 12px;
            border-left: 4px solid #4a7c9b;
        }
        .site-header {
            background: linear-gradient(135deg, #0d1b2a 0%, #1b2a3a 100%);
            padding: 0.8rem 0;
            border-radius: 0 0 20px 20px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
            position: sticky;
            top: 0;
            z-index: 100;
            backdrop-filter: blur(6px);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: #ffffff;
            text-decoration: none;
            letter-spacing: -0.02em;
            background: linear-gradient(90deg, #8fc1d9, #b8d8e8);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .my-logo:hover {
            opacity: 0.85;
            text-decoration: none;
        }
        .my-logo small {
            font-size: 0.7rem;
            font-weight: 400;
            -webkit-text-fill-color: #aac7d9;
            display: block;
            letter-spacing: 0.3px;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: 2px solid rgba(255, 255, 255, 0.3);
            color: #fff;
            font-size: 1.5rem;
            padding: 0.3rem 0.7rem;
            border-radius: 8px;
            cursor: pointer;
            transition: 0.2s;
        }
        .nav-toggle:hover {
            border-color: #8fc1d9;
            color: #8fc1d9;
        }
        .primary-nav {
            display: flex;
            gap: 0.2rem;
            flex-wrap: wrap;
            align-items: center;
        }
        .primary-nav a {
            color: #dce8f0;
            padding: 0.4rem 0.9rem;
            border-radius: 30px;
            font-size: 0.88rem;
            font-weight: 500;
            transition: 0.2s;
        }
        .primary-nav a:hover {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            text-decoration: none;
        }
        .breadcrumb {
            background: #e8edf2;
            padding: 0.5rem 1.2rem;
            border-radius: 30px;
            font-size: 0.85rem;
            margin: 1rem 0 0.5rem;
            display: flex;
            flex-wrap: wrap;
            gap: 0.3rem;
        }
        .breadcrumb a {
            color: #2b5f8a;
        }
        .breadcrumb span {
            color: #5a6a7a;
        }
        .article-wrapper {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            margin: 1.5rem 0 2.5rem;
        }
        .article-main {
            background: #fff;
            border-radius: 20px;
            padding: 2rem 2.2rem;
            box-shadow: 0 2px 24px rgba(0, 0, 0, 0.04);
        }
        .article-sidebar {
            background: #fff;
            border-radius: 20px;
            padding: 1.8rem 1.5rem;
            box-shadow: 0 2px 24px rgba(0, 0, 0, 0.04);
            align-self: start;
            position: sticky;
            top: 100px;
        }
        .sidebar-section {
            margin-bottom: 1.8rem;
        }
        .sidebar-section h3 {
            font-size: 1.1rem;
            margin-top: 0;
            border-bottom: 2px solid #e2e8f0;
            padding-bottom: 0.4rem;
        }
        .sidebar-section ul {
            list-style: none;
            padding: 0;
        }
        .sidebar-section li {
            margin: 0.5rem 0;
        }
        .sidebar-section li a {
            display: block;
            padding: 0.3rem 0.6rem;
            border-radius: 6px;
            font-size: 0.9rem;
        }
        .sidebar-section li a:hover {
            background: #eef3f7;
            text-decoration: none;
        }
        .feature-image-wrap {
            margin: 1.5rem 0 2rem;
            border-radius: 16px;
            overflow: hidden;
            background: #eef3f7;
            text-align: center;
            padding: 0.5rem;
        }
        .feature-image-wrap img {
            border-radius: 12px;
            width: 100%;
            max-height: 480px;
            object-fit: cover;
        }
        .data-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            font-size: 0.95rem;
            background: #f8fafc;
            border-radius: 12px;
            overflow: hidden;
        }
        .data-table th {
            background: #1b2a3a;
            color: #fff;
            padding: 0.7rem 1rem;
            text-align: left;
            font-weight: 600;
        }
        .data-table td {
            padding: 0.6rem 1rem;
            border-bottom: 1px solid #e2e8f0;
        }
        .data-table tr:last-child td {
            border-bottom: none;
        }
        .interaction-section {
            background: #f0f4f9;
            border-radius: 20px;
            padding: 1.8rem 2rem;
            margin: 2.5rem 0 1.5rem;
        }
        .interaction-section h2 {
            margin-top: 0;
            border-left-color: #7a9bb5;
        }
        .form-group {
            display: flex;
            flex-wrap: wrap;
            gap: 0.8rem;
            margin: 1rem 0;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            flex: 1 1 200px;
            padding: 0.7rem 1rem;
            border: 1px solid #cbd5e1;
            border-radius: 10px;
            font-size: 0.95rem;
            background: #fff;
            transition: 0.2s;
        }
        .form-group input:focus,
        .form-group textarea:focus {
            border-color: #4a7c9b;
            outline: none;
            box-shadow: 0 0 0 3px rgba(74, 124, 155, 0.15);
        }
        .form-group textarea {
            min-height: 80px;
            flex-basis: 100%;
        }
        .btn {
            background: #1b2a3a;
            color: #fff;
            border: none;
            padding: 0.6rem 1.6rem;
            border-radius: 30px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: 0.2s;
        }
        .btn:hover {
            background: #0d1b2a;
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
        }
        .btn-outline {
            background: transparent;
            border: 2px solid #1b2a3a;
            color: #1b2a3a;
        }
        .btn-outline:hover {
            background: #1b2a3a;
            color: #fff;
        }
        .star-rating {
            display: flex;
            gap: 0.2rem;
            font-size: 1.6rem;
            color: #d1d5db;
            cursor: pointer;
            direction: rtl;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            transition: 0.15s;
            color: #d1d5db;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f5b342;
        }
        .site-footer {
            background: #0d1b2a;
            color: #cbd5e1;
            border-radius: 20px 20px 0 0;
            padding: 2rem 1.5rem 1.2rem;
            margin-top: 2.5rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1.8rem;
        }
        .footer-grid h4 {
            color: #e2e8f0;
            margin-bottom: 0.6rem;
            border-bottom: 1px solid #2a3a4a;
            padding-bottom: 0.3rem;
        }
        .footer-grid a {
            color: #94a3b8;
            display: block;
            padding: 0.2rem 0;
            font-size: 0.9rem;
        }
        .footer-grid a:hover {
            color: #fff;
            text-decoration: none;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            margin-top: 1.5rem;
            border-top: 1px solid #1f2f3f;
            font-size: 0.85rem;
            color: #6a7a8a;
        }
        friend-link {
            display: block;
            padding: 0.8rem 0 0.2rem;
        }
        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: 0.85rem;
            color: #94a3b8;
        }
        friend-link a:hover {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
        }
        .last-updated {
            font-size: 0.85rem;
            color: #6a7a8a;
            background: #eef3f7;
            display: inline-block;
            padding: 0.2rem 1rem;
            border-radius: 30px;
            margin-bottom: 1rem;
        }
        @media (max-width: 1024px) {
            .article-wrapper {
                grid-template-columns: 1fr;
            }
            .article-sidebar {
                position: static;
                order: 2;
            }
            .article-main {
                order: 1;
            }
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            h3 {
                font-size: 1.15rem;
            }
            .article-main {
                padding: 1.2rem 1rem;
            }
            .article-sidebar {
                padding: 1.2rem 1rem;
            }
            .header-inner {
                flex-wrap: wrap;
            }
            .nav-toggle {
                display: inline-block;
            }
            .primary-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                gap: 0.1rem;
                padding-top: 0.8rem;
                border-top: 1px solid rgba(255, 255, 255, 0.1);
                margin-top: 0.6rem;
            }
            .primary-nav.open {
                display: flex;
            }
            .primary-nav a {
                padding: 0.6rem 0.8rem;
                border-radius: 8px;
            }
            .interaction-section {
                padding: 1.2rem 1rem;
            }
            .site-footer {
                padding: 1.5rem 1rem 1rem;
            }
            .data-table {
                font-size: 0.8rem;
            }
            .data-table th,
            .data-table td {
                padding: 0.4rem 0.6rem;
            }
        }
        @media (max-width: 480px) {
            body {
                padding: 0 0.5rem;
            }
            h1 {
                font-size: 1.5rem;
            }
            .my-logo {
                font-size: 1.4rem;
            }
            .breadcrumb {
                font-size: 0.75rem;
                padding: 0.3rem 0.8rem;
            }
            .form-group input,
            .form-group textarea,
            .form-group select {
                flex-basis: 100%;
            }
        }
        .highlight-box {
            background: #eef3f7;
            border-left: 4px solid #4a7c9b;
            padding: 1.2rem 1.5rem;
            border-radius: 12px;
            margin: 1.5rem 0;
        }
        .emoji-lg {
            font-size: 1.4rem;
        }
        .tag {
            display: inline-block;
            background: #dce8f0;
            color: #1b2a3a;
            padding: 0.1rem 0.7rem;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 500;
        }
        .flex-between {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }