*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        :root {
            --primary: #1a3c4a;
            --primary-light: #2a5c6e;
            --accent: #d4a843;
            --accent-light: #f0d68a;
            --bg: #faf7f2;
            --card-bg: #ffffff;
            --text: #2d2d2d;
            --text-light: #5a5a5a;
            --border: #e8e0d4;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            --radius: 12px;
            --font: 'Segoe UI', system-ui, -apple-system, Roboto, sans-serif;
            --max-width: 1120px;
            --header-bg: #0f2a35;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: var(--accent);
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius);
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: var(--header-bg);
            padding: 12px 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 16px rgba(0, 0, 0, 0.15);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 10px;
        }
        .my-logo {
            font-size: 1.6rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: var(--accent);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .my-logo i {
            font-size: 1.8rem;
            color: var(--accent-light);
        }
        .my-logo:hover {
            color: #fff;
            text-decoration: none;
        }
        .my-logo span {
            color: #fff;
            font-weight: 400;
            font-size: 0.75rem;
            display: block;
            letter-spacing: 1px;
            opacity: 0.7;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: #fff;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 6px;
            transition: background 0.2s;
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .main-nav {
            display: flex;
            gap: 6px;
            flex-wrap: wrap;
            align-items: center;
        }
        .main-nav a {
            color: rgba(255, 255, 255, 0.85);
            padding: 6px 14px;
            border-radius: 6px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: all 0.2s;
            white-space: nowrap;
        }
        .main-nav a:hover,
        .main-nav a.active {
            background: rgba(212, 168, 67, 0.2);
            color: var(--accent-light);
            text-decoration: none;
        }
        .breadcrumb {
            padding: 12px 0 6px;
            font-size: 0.85rem;
            color: var(--text-light);
            display: flex;
            flex-wrap: wrap;
            gap: 4px 8px;
            background: var(--bg);
            border-bottom: 1px solid var(--border);
        }
        .breadcrumb a {
            color: var(--primary-light);
        }
        .breadcrumb a:hover {
            color: var(--accent);
        }
        .breadcrumb .sep {
            color: #bbb;
        }
        .breadcrumb .current {
            color: var(--text);
            font-weight: 500;
        }
        .content-wrap {
            padding: 30px 0 50px;
        }
        .content-wrap h1 {
            font-size: 2.4rem;
            font-weight: 800;
            line-height: 1.2;
            color: var(--primary);
            margin-bottom: 0.5rem;
            letter-spacing: -0.5px;
        }
        .content-wrap h1 i {
            color: var(--accent);
            margin-right: 10px;
        }
        .subhead {
            font-size: 1.1rem;
            color: var(--text-light);
            margin-bottom: 1.8rem;
            border-left: 4px solid var(--accent);
            padding-left: 18px;
        }
        .last-updated {
            display: inline-block;
            background: var(--accent-light);
            color: var(--primary);
            padding: 4px 16px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 20px;
        }
        .content-wrap h2 {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary);
            margin: 2.5rem 0 1rem;
            padding-bottom: 6px;
            border-bottom: 3px solid var(--accent);
        }
        .content-wrap h2 i {
            color: var(--accent);
            margin-right: 8px;
        }
        .content-wrap h3 {
            font-size: 1.35rem;
            font-weight: 600;
            color: var(--primary-light);
            margin: 1.8rem 0 0.8rem;
        }
        .content-wrap h3 i {
            color: var(--accent);
            margin-right: 6px;
        }
        .content-wrap h4 {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--text);
            margin: 1.2rem 0 0.5rem;
        }
        .content-wrap p {
            margin-bottom: 1.2rem;
            color: var(--text);
        }
        .content-wrap ul,
        .content-wrap ol {
            margin: 0.8rem 0 1.5rem 1.5rem;
        }
        .content-wrap li {
            margin-bottom: 0.5rem;
        }
        .content-wrap .highlight-box {
            background: var(--card-bg);
            border-left: 5px solid var(--accent);
            padding: 20px 24px;
            border-radius: 0 var(--radius) var(--radius) 0;
            margin: 1.5rem 0;
            box-shadow: var(--shadow);
        }
        .content-wrap .highlight-box p:last-child {
            margin-bottom: 0;
        }
        .feature-img {
            margin: 1.8rem 0;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        .feature-img img {
            width: 100%;
            max-height: 480px;
            object-fit: cover;
        }
        .feature-img figcaption {
            font-size: 0.85rem;
            color: var(--text-light);
            padding: 8px 4px 0;
            font-style: italic;
        }
        .insight-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin: 1.5rem 0;
        }
        .insight-card {
            background: var(--card-bg);
            padding: 20px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            transition: transform 0.2s, box-shadow 0.2s;
        }
        .insight-card:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
        }
        .insight-card i {
            font-size: 1.6rem;
            color: var(--accent);
            margin-bottom: 8px;
        }
        .insight-card h4 {
            margin-top: 0;
        }
        .form-section {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 28px 30px;
            margin: 2rem 0;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
        }
        .form-section h3 {
            margin-top: 0;
        }
        .form-group {
            margin-bottom: 16px;
        }
        .form-group label {
            display: block;
            font-weight: 600;
            margin-bottom: 4px;
            font-size: 0.9rem;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 10px 14px;
            border: 1px solid var(--border);
            border-radius: 8px;
            font-family: var(--font);
            font-size: 0.95rem;
            transition: border 0.2s;
            background: #fff;
        }
        .form-group input:focus,
        .form-group textarea:focus {
            outline: none;
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(212, 168, 67, 0.15);
        }
        .form-group textarea {
            min-height: 100px;
            resize: vertical;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 28px;
            border: none;
            border-radius: 8px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: all 0.2s;
            background: var(--primary);
            color: #fff;
        }
        .btn:hover {
            background: var(--primary-light);
            transform: translateY(-1px);
        }
        .btn-accent {
            background: var(--accent);
            color: var(--primary);
        }
        .btn-accent:hover {
            background: #c99a36;
            color: var(--primary);
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            gap: 4px;
            justify-content: flex-end;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: var(--accent);
        }
        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }
        .comment-item {
            background: var(--bg);
            padding: 14px 18px;
            border-radius: 8px;
            margin-bottom: 12px;
            border-left: 3px solid var(--accent);
        }
        .comment-item .meta {
            font-size: 0.8rem;
            color: var(--text-light);
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }
        .comment-item .meta strong {
            color: var(--primary);
        }
        .site-footer {
            background: var(--header-bg);
            color: rgba(255, 255, 255, 0.85);
            padding: 40px 0 20px;
            margin-top: 40px;
        }
        .site-footer .container {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 30px;
        }
        .site-footer h4 {
            color: var(--accent);
            margin-bottom: 12px;
            font-size: 1rem;
        }
        .site-footer a {
            color: rgba(255, 255, 255, 0.7);
        }
        .site-footer a:hover {
            color: var(--accent-light);
        }
        .site-footer .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .site-footer .footer-links li {
            margin-bottom: 6px;
        }
        .friend-link {
            display: block;
            padding: 8px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            margin-top: 12px;
        }
        .friend-link a {
            display: inline-block;
            margin-right: 16px;
            padding: 4px 0;
        }
        .copyright {
            grid-column: 1 / -1;
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
            margin-top: 10px;
        }
        @media (max-width: 900px) {
            .site-footer .container {
                grid-template-columns: 1fr 1fr;
            }
            .insight-grid {
                grid-template-columns: 1fr;
            }
            .form-row {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: stretch;
                padding: 12px 0 4px;
                gap: 2px;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 10px 14px;
                border-radius: 6px;
            }
            .header-inner {
                align-items: center;
            }
            .content-wrap h1 {
                font-size: 1.8rem;
            }
            .content-wrap h2 {
                font-size: 1.4rem;
            }
            .content-wrap h3 {
                font-size: 1.15rem;
            }
            .site-footer .container {
                grid-template-columns: 1fr;
            }
            .breadcrumb {
                font-size: 0.75rem;
                padding: 8px 0 4px;
            }
            .form-section {
                padding: 18px 16px;
            }
            .my-logo {
                font-size: 1.3rem;
            }
            .feature-img img {
                max-height: 260px;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 14px;
            }
            .content-wrap h1 {
                font-size: 1.5rem;
            }
            .content-wrap h2 {
                font-size: 1.2rem;
            }
            .star-rating label {
                font-size: 1.5rem;
            }
            .btn {
                width: 100%;
                justify-content: center;
            }
        }
        .scroll-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            border: none;
            font-size: 1.2rem;
            cursor: pointer;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
            transition: all 0.3s;
            opacity: 0;
            visibility: hidden;
            z-index: 999;
        }
        .scroll-top.visible {
            opacity: 1;
            visibility: visible;
        }
        .scroll-top:hover {
            background: var(--accent);
            color: var(--primary);
            transform: translateY(-3px);
        }
        .styled-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            font-size: 0.95rem;
            background: var(--card-bg);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .styled-table thead {
            background: var(--primary);
            color: #fff;
        }
        .styled-table th,
        .styled-table td {
            padding: 12px 16px;
            text-align: left;
            border-bottom: 1px solid var(--border);
        }
        .styled-table tbody tr:hover {
            background: rgba(212, 168, 67, 0.06);
        }
        @media (max-width: 600px) {
            .styled-table {
                font-size: 0.8rem;
            }
            .styled-table th,
            .styled-table td {
                padding: 8px 10px;
            }
        }
        .toc {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 20px 24px;
            margin: 1.5rem 0;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
        }
        .toc summary {
            font-weight: 700;
            font-size: 1.1rem;
            cursor: pointer;
            color: var(--primary);
        }
        .toc ol {
            margin: 12px 0 0 1.2rem;
        }
        .toc ol li {
            margin-bottom: 4px;
        }
        .toc ol a {
            color: var(--primary-light);
        }