*,
        *::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;
            background: #f5f7fa;
            color: #1a1a2e;
            line-height: 1.7;
            padding: 0 16px;
            max-width: 1280px;
            margin: 0 auto;
        }
        a {
            color: #0057b3;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover,
        a:focus-visible {
            color: #ff6b00;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        ul,
        ol {
            padding-left: 1.5rem;
            margin: 0.75rem 0;
        }
        li {
            margin-bottom: 0.3rem;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.2;
            color: #0b1c2f;
            margin-top: 1.8rem;
            margin-bottom: 0.6rem;
            font-weight: 700;
        }
        h1 {
            font-size: 2.2rem;
            border-left: 6px solid #ff6b00;
            padding-left: 1rem;
        }
        h2 {
            font-size: 1.8rem;
            border-bottom: 2px solid #e0e6ed;
            padding-bottom: 0.3rem;
        }
        h3 {
            font-size: 1.4rem;
            color: #1e3a5f;
        }
        h4 {
            font-size: 1.15rem;
            color: #2c4c6b;
        }
        p {
            margin-bottom: 1rem;
        }
        .container {
            background: #ffffff;
            border-radius: 24px;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
            padding: 20px 24px 30px;
            margin: 20px 0 30px;
        }
        .badge {
            display: inline-block;
            background: #ff6b00;
            color: #fff;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 0.2rem 0.8rem;
            border-radius: 40px;
            letter-spacing: 0.3px;
        }
        .tag {
            display: inline-block;
            background: #eef3f9;
            color: #1e3a5f;
            font-size: 0.75rem;
            padding: 0.2rem 0.8rem;
            border-radius: 40px;
            margin-right: 0.3rem;
        }
        .divider {
            height: 2px;
            background: linear-gradient(to right, #e0e6ed, transparent);
            margin: 2rem 0;
        }
        .emoji-lg {
            font-size: 1.4em;
        }
        .text-muted {
            color: #5a6a7c;
            font-size: 0.9rem;
        }
        .highlight-box {
            background: #f0f6ff;
            border-left: 5px solid #0057b3;
            padding: 1rem 1.5rem;
            border-radius: 0 12px 12px 0;
            margin: 1.5rem 0;
        }
        .highlight-box--warn {
            background: #fff8eb;
            border-left-color: #ff6b00;
        }
        .btn {
            display: inline-block;
            background: #0057b3;
            color: #fff !important;
            padding: 0.5rem 1.5rem;
            border-radius: 40px;
            font-weight: 600;
            transition: background 0.2s, transform 0.1s;
            border: none;
            cursor: pointer;
            font-size: 0.95rem;
        }
        .btn:hover {
            background: #003d80;
            transform: translateY(-1px);
            text-decoration: none;
        }
        .btn--secondary {
            background: #ff6b00;
        }
        .btn--secondary:hover {
            background: #cc5500;
        }
        .site-header {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 18px 0 10px;
            border-bottom: 1px solid #e0e6ed;
            position: relative;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: #0b1c2f;
            letter-spacing: -0.5px;
            line-height: 1.1;
            transition: opacity 0.2s;
        }
        .my-logo:hover {
            opacity: 0.8;
            text-decoration: none;
        }
        .my-logo span {
            color: #ff6b00;
        }
        .my-logo small {
            display: block;
            font-size: 0.65rem;
            font-weight: 400;
            color: #5a6a7c;
            letter-spacing: 1px;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: #0b1c2f;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 8px;
            transition: background 0.2s;
        }
        .nav-toggle:hover {
            background: #eef3f9;
        }
        .primary-nav {
            display: flex;
            flex-wrap: wrap;
            gap: 0.3rem 0.8rem;
            align-items: center;
        }
        .primary-nav a {
            font-weight: 500;
            padding: 0.3rem 0.6rem;
            border-radius: 30px;
            font-size: 0.9rem;
            color: #1e3a5f;
            transition: background 0.2s, color 0.2s;
        }
        .primary-nav a:hover {
            background: #eef3f9;
            color: #0057b3;
            text-decoration: none;
        }
        .primary-nav .active {
            background: #0057b3;
            color: #fff;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            padding: 0.6rem 0;
            margin: 0;
            font-size: 0.85rem;
            color: #5a6a7c;
        }
        .breadcrumb li+li::before {
            content: "›";
            padding: 0 0.6rem;
            color: #b0c0d0;
            font-weight: 700;
        }
        .breadcrumb a {
            color: #5a6a7c;
        }
        .breadcrumb a:hover {
            color: #0057b3;
        }
        .breadcrumb .current {
            color: #1a1a2e;
            font-weight: 600;
        }
        .search-form {
            display: flex;
            gap: 0.5rem;
            max-width: 560px;
            margin: 1.2rem 0 0.8rem;
        }
        .search-form input[type="text"] {
            flex: 1;
            padding: 0.6rem 1rem;
            border: 2px solid #dce3ec;
            border-radius: 40px;
            font-size: 0.95rem;
            outline: none;
            transition: border-color 0.2s;
        }
        .search-form input[type="text"]:focus {
            border-color: #0057b3;
        }
        .search-form button {
            background: #0057b3;
            color: #fff;
            border: none;
            border-radius: 40px;
            padding: 0 1.4rem;
            font-size: 1rem;
            cursor: pointer;
            transition: background 0.2s;
        }
        .search-form button:hover {
            background: #003d80;
        }
        .user-feedback {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem 2.5rem;
            margin: 2rem 0 1rem;
            padding: 1.2rem 0;
            border-top: 1px solid #e0e6ed;
            border-bottom: 1px solid #e0e6ed;
        }
        .feedback-block {
            flex: 1 1 200px;
        }
        .feedback-block h4 {
            margin-top: 0;
            font-size: 1rem;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .feedback-block form {
            display: flex;
            flex-wrap: wrap;
            gap: 0.4rem;
            margin-top: 0.3rem;
        }
        .feedback-block input,
        .feedback-block textarea,
        .feedback-block select {
            border: 2px solid #dce3ec;
            border-radius: 12px;
            padding: 0.4rem 0.8rem;
            font-size: 0.9rem;
            outline: none;
            width: 100%;
            transition: border-color 0.2s;
        }
        .feedback-block input:focus,
        .feedback-block textarea:focus,
        .feedback-block select:focus {
            border-color: #0057b3;
        }
        .feedback-block textarea {
            min-height: 60px;
            resize: vertical;
        }
        .feedback-block .fb-row {
            display: flex;
            gap: 0.4rem;
            width: 100%;
        }
        .feedback-block .fb-row input {
            flex: 1;
        }
        .feedback-block .fb-row button {
            flex-shrink: 0;
        }
        .star-select {
            display: flex;
            gap: 0.2rem;
            align-items: center;
        }
        .star-select i {
            font-size: 1.4rem;
            color: #ffb83b;
            cursor: pointer;
            transition: transform 0.1s;
        }
        .star-select i:hover {
            transform: scale(1.2);
        }
        .featured-image {
            margin: 1.8rem 0;
            border-radius: 16px;
            overflow: hidden;
            background: #eef3f9;
        }
        .featured-image figcaption {
            padding: 0.5rem 1rem 0.8rem;
            font-size: 0.85rem;
            color: #5a6a7c;
            background: #f9fafc;
        }
        .site-footer {
            margin-top: 3rem;
            padding: 2rem 0 1.5rem;
            border-top: 2px solid #e0e6ed;
            font-size: 0.9rem;
            color: #5a6a7c;
        }
        .site-footer .footer-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem 3rem;
            justify-content: space-between;
        }
        .site-footer .footer-col {
            flex: 1 1 180px;
        }
        .site-footer h5 {
            font-size: 1rem;
            margin-top: 0;
            color: #0b1c2f;
        }
        friend-link {
            display: block;
            margin: 0.5rem 0;
        }
        friend-link a {
            display: inline-block;
            margin-right: 1.2rem;
            margin-bottom: 0.3rem;
            color: #5a6a7c;
            font-size: 0.9rem;
        }
        friend-link a:hover {
            color: #0057b3;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            margin-top: 1.5rem;
            border-top: 1px solid #e0e6ed;
            font-size: 0.8rem;
        }
        @media (max-width: 768px) {
            body {
                padding: 0 10px;
            }
            .container {
                padding: 14px 14px 20px;
                border-radius: 16px;
            }
            h1 {
                font-size: 1.6rem;
                padding-left: 0.8rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            h3 {
                font-size: 1.15rem;
            }
            .site-header {
                padding: 12px 0 6px;
            }
            .my-logo {
                font-size: 1.4rem;
            }
            .nav-toggle {
                display: block;
            }
            .primary-nav {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #fff;
                padding: 1rem 0 0.5rem;
                border-top: 1px solid #e0e6ed;
                margin-top: 8px;
            }
            .primary-nav.open {
                display: flex;
            }
            .primary-nav a {
                padding: 0.5rem 0.8rem;
                font-size: 1rem;
            }
            .user-feedback {
                flex-direction: column;
                gap: 1.2rem;
            }
            .search-form {
                max-width: 100%;
            }
            .site-footer .footer-grid {
                flex-direction: column;
                gap: 1rem;
            }
            .breadcrumb {
                font-size: 0.75rem;
            }
            .feedback-block .fb-row {
                flex-wrap: wrap;
            }
        }
        @media (min-width: 769px) {
            .primary-nav {
                display: flex !important;
            }
            .nav-toggle {
                display: none !important;
            }
        }
        .scroll-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: #0b1c2f;
            color: #fff;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
            transition: opacity 0.3s, transform 0.2s;
            opacity: 0.8;
            z-index: 99;
            border: none;
            cursor: pointer;
        }
        .scroll-top:hover {
            opacity: 1;
            transform: translateY(-4px);
        }
        @media (max-width: 480px) {
            .scroll-top {
                bottom: 16px;
                right: 16px;
                width: 40px;
                height: 40px;
                font-size: 1.2rem;
            }
        }
        .data-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.2rem 0;
            font-size: 0.9rem;
        }
        .data-table th {
            background: #0b1c2f;
            color: #fff;
            padding: 0.6rem 0.8rem;
            text-align: left;
            font-weight: 600;
        }
        .data-table td {
            padding: 0.5rem 0.8rem;
            border-bottom: 1px solid #e0e6ed;
        }
        .data-table tr:nth-child(even) td {
            background: #f9fafc;
        }
        .data-table tr:hover td {
            background: #f0f6ff;
        }
        .author-bio {
            display: flex;
            align-items: center;
            gap: 1rem;
            padding: 1rem 1.2rem;
            background: #f5f7fa;
            border-radius: 16px;
            margin: 1.5rem 0;
        }
        .author-bio .avatar {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: #0057b3;
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            font-weight: 700;
            flex-shrink: 0;
        }
        .author-bio .info {
            font-size: 0.9rem;
        }
        .author-bio .info strong {
            display: block;
            font-size: 1rem;
        }
        .update-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            background: #e8f0fe;
            color: #0057b3;
            padding: 0.2rem 0.8rem;
            border-radius: 40px;
            font-size: 0.8rem;
            font-weight: 500;
        }