*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Roboto, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
            background: #f5f7fc;
            color: #1a1a2e;
            line-height: 1.7;
            padding: 0 1rem;
        }
        a {
            color: #0047ab;
            text-decoration: none;
            transition: color 0.25s;
        }
        a:hover,
        a:focus-visible {
            color: #e85d04;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        ul,
        ol {
            padding-left: 1.5rem;
            margin-bottom: 1.2rem;
        }
        li {
            margin-bottom: 0.4rem;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            margin-top: 0;
            color: #0b1a33;
        }
        h1 {
            font-size: 2.4rem;
            margin-bottom: 0.75rem;
        }
        h2 {
            font-size: 1.8rem;
            margin: 2.2rem 0 1rem;
            border-left: 5px solid #e85d04;
            padding-left: 1rem;
        }
        h3 {
            font-size: 1.35rem;
            margin: 1.8rem 0 0.7rem;
        }
        h4 {
            font-size: 1.1rem;
            margin: 1.2rem 0 0.5rem;
            color: #2d3a5e;
        }
        p {
            margin-bottom: 1.2rem;
        }
        blockquote {
            background: #eef1fa;
            border-left: 5px solid #e85d04;
            padding: 1rem 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 12px 12px 0;
            font-style: italic;
            color: #2c3e66;
        }
        hr {
            border: none;
            border-top: 2px dashed #cbd5e1;
            margin: 2.5rem 0;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: #ffffff;
            border-radius: 20px;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.06);
            padding: 1.5rem 2rem 2rem;
        }
        .site-header {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 1rem 0 0.8rem;
            border-bottom: 2px solid #e2e8f0;
            position: relative;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #0047ab, #e85d04);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            display: inline-block;
        }
        .my-logo:hover {
            opacity: 0.85;
            text-decoration: none;
        }
        .my-logo small {
            font-size: 0.7rem;
            font-weight: 400;
            -webkit-text-fill-color: #4a5568;
            color: #4a5568;
            display: block;
            letter-spacing: 1px;
        }
        .nav-bar {
            display: flex;
            align-items: center;
            gap: 0.2rem;
            flex-wrap: wrap;
        }
        .nav-bar a {
            padding: 0.5rem 1rem;
            font-weight: 500;
            border-radius: 30px;
            transition: background 0.2s, color 0.2s;
            color: #1a1a2e;
            font-size: 0.95rem;
        }
        .nav-bar a:hover {
            background: #eef1fa;
            color: #0047ab;
            text-decoration: none;
        }
        .nav-bar a i {
            margin-right: 6px;
            font-size: 0.85rem;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: #1a1a2e;
            cursor: pointer;
            padding: 0.2rem 0.5rem;
            border-radius: 8px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: #eef1fa;
        }
        #nav-toggle {
            display: none;
        }
        .breadcrumb {
            padding: 0.8rem 0 0.2rem;
            font-size: 0.9rem;
            color: #64748b;
            display: flex;
            flex-wrap: wrap;
            gap: 0.4rem;
        }
        .breadcrumb a {
            color: #0047ab;
        }
        .breadcrumb a:hover {
            color: #e85d04;
        }
        .breadcrumb span {
            color: #94a3b8;
        }
        .search-section {
            background: #f1f4fd;
            padding: 1.5rem 2rem;
            border-radius: 16px;
            margin: 1.5rem 0 2rem;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 1rem;
        }
        .search-section form {
            display: flex;
            flex: 1 1 300px;
            gap: 0.5rem;
        }
        .search-section input[type="text"] {
            flex: 1;
            padding: 0.75rem 1.2rem;
            border: 2px solid #dce3f0;
            border-radius: 40px;
            font-size: 1rem;
            outline: none;
            transition: border 0.25s;
        }
        .search-section input[type="text"]:focus {
            border-color: #0047ab;
        }
        .search-section button {
            padding: 0.75rem 1.8rem;
            background: #0047ab;
            color: #fff;
            border: none;
            border-radius: 40px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.25s;
            font-size: 1rem;
        }
        .search-section button:hover {
            background: #e85d04;
        }
        .interaction-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
            margin: 2rem 0;
        }
        .interaction-card {
            background: #f8faff;
            border-radius: 16px;
            padding: 1.5rem 1.8rem;
            border: 1px solid #e6edf8;
        }
        .interaction-card h3 {
            margin-top: 0;
            font-size: 1.3rem;
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        .interaction-card form {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
            margin-top: 0.8rem;
        }
        .interaction-card input,
        .interaction-card textarea,
        .interaction-card select {
            padding: 0.7rem 1rem;
            border: 2px solid #dce3f0;
            border-radius: 10px;
            font-size: 0.95rem;
            outline: none;
            transition: border 0.25s;
            font-family: inherit;
        }
        .interaction-card input:focus,
        .interaction-card textarea:focus,
        .interaction-card select:focus {
            border-color: #0047ab;
        }
        .interaction-card textarea {
            min-height: 80px;
            resize: vertical;
        }
        .interaction-card .btn-submit {
            background: #0047ab;
            color: #fff;
            border: none;
            padding: 0.7rem 1.5rem;
            border-radius: 40px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.25s;
            align-self: flex-start;
        }
        .interaction-card .btn-submit:hover {
            background: #e85d04;
        }
        .star-rating {
            display: flex;
            gap: 0.3rem;
            font-size: 1.6rem;
            color: #fbbf24;
            cursor: pointer;
            direction: rtl;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            cursor: pointer;
            transition: transform 0.15s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            transform: scale(1.15);
            color: #f59e0b;
        }
        .featured-image {
            margin: 2rem 0;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
        }
        .featured-image figcaption {
            background: #f1f4fd;
            padding: 0.6rem 1.2rem;
            font-size: 0.9rem;
            color: #475569;
            text-align: center;
        }
        .data-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            font-size: 0.95rem;
            border-radius: 12px;
            overflow: hidden;
        }
        .data-table th {
            background: #0b1a33;
            color: #fff;
            padding: 0.8rem 1rem;
            text-align: left;
        }
        .data-table td {
            padding: 0.7rem 1rem;
            border-bottom: 1px solid #e2e8f0;
        }
        .data-table tr:nth-child(even) {
            background: #f8faff;
        }
        .data-table tr:hover {
            background: #eef1fa;
        }
        friend-link {
            display: block;
            padding: 1.5rem 0 0.5rem;
            border-top: 2px solid #e2e8f0;
            margin-top: 2.5rem;
        }
        friend-link h3 {
            font-size: 1.2rem;
            margin-bottom: 1rem;
            color: #0b1a33;
        }
        friend-link ul {
            list-style: none;
            padding: 0;
            display: flex;
            flex-wrap: wrap;
            gap: 0.8rem 1.8rem;
        }
        friend-link li a {
            font-weight: 500;
        }
        .site-footer {
            text-align: center;
            padding: 1.8rem 0 0.8rem;
            color: #64748b;
            font-size: 0.9rem;
            border-top: 1px solid #e2e8f0;
            margin-top: 1.5rem;
        }
        .site-footer p {
            margin-bottom: 0.4rem;
        }
        @media (max-width: 900px) {
            .container {
                padding: 1rem 1.2rem;
            }
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            .interaction-grid {
                grid-template-columns: 1fr;
            }
            .nav-bar {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #ffffff;
                padding: 1rem 0;
                border-top: 1px solid #e2e8f0;
                margin-top: 0.8rem;
            }
            .nav-bar a {
                padding: 0.7rem 1.2rem;
                width: 100%;
                border-radius: 0;
            }
            .hamburger {
                display: block;
            }
            #nav-toggle:checked~.nav-bar {
                display: flex;
            }
            .search-section {
                padding: 1.2rem;
                flex-direction: column;
            }
            .search-section form {
                width: 100%;
            }
            .data-table {
                font-size: 0.85rem;
            }
            .data-table th,
            .data-table td {
                padding: 0.5rem 0.6rem;
            }
        }
        @media (max-width: 480px) {
            body {
                padding: 0 0.5rem;
            }
            .container {
                padding: 0.8rem 0.8rem;
                border-radius: 12px;
            }
            h1 {
                font-size: 1.5rem;
            }
            h2 {
                font-size: 1.25rem;
                padding-left: 0.6rem;
            }
            .my-logo {
                font-size: 1.5rem;
            }
            .breadcrumb {
                font-size: 0.8rem;
            }
            .interaction-card {
                padding: 1rem;
            }
        }
        .highlight {
            background: #fef9e7;
            padding: 0.1rem 0.3rem;
            border-radius: 4px;
            font-weight: 600;
        }
        .badge {
            display: inline-block;
            background: #e85d04;
            color: #fff;
            padding: 0.2rem 0.9rem;
            border-radius: 40px;
            font-size: 0.75rem;
            font-weight: 700;
            letter-spacing: 0.5px;
        }
        .toc {
            background: #f1f4fd;
            padding: 1.2rem 1.8rem;
            border-radius: 16px;
            margin: 1.5rem 0;
        }
        .toc ol {
            margin-bottom: 0;
        }
        .toc a {
            color: #1a1a2e;
        }
        .toc a:hover {
            color: #e85d04;
        }
        .last-updated {
            display: block;
            text-align: right;
            font-size: 0.85rem;
            color: #64748b;
            margin-top: 0.5rem;
            font-style: italic;
        }
        .btn-top {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            background: #0047ab;
            color: #fff;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            box-shadow: 0 6px 20px rgba(0, 71, 171, 0.3);
            transition: background 0.25s, transform 0.25s;
            z-index: 99;
            border: none;
            cursor: pointer;
        }
        .btn-top:hover {
            background: #e85d04;
            transform: translateY(-4px);
        }
        @media (max-width: 600px) {
            .btn-top {
                bottom: 1rem;
                right: 1rem;
                width: 40px;
                height: 40px;
                font-size: 1.1rem;
            }
        }