*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        :root {
            --primary: #0a3d62;
            --primary-light: #1e6fa0;
            --accent: #e67e22;
            --accent-light: #f39c12;
            --bg: #f8f9fa;
            --card-bg: #ffffff;
            --text: #2c3e50;
            --text-light: #6c7a89;
            --border: #dee2e6;
            --shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
            --radius: 16px;
            --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
            --max-width: 1200px;
            --header-bg: linear-gradient(135deg, #0a3d62 0%, #1e6fa0 100%);
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: var(--accent);
        }
        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);
            color: #fff;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 20px;
            max-width: var(--max-width);
            margin: 0 auto;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 8px;
            text-decoration: none;
        }
        .my-logo span {
            background: var(--accent);
            padding: 2px 10px;
            border-radius: 40px;
            font-size: 0.9rem;
            font-weight: 600;
            color: #fff;
        }
        .my-logo i {
            color: var(--accent-light);
        }
        .my-logo:hover {
            color: #fff;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.6rem;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 8px;
            transition: background 0.2s;
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.15);
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }
        .nav-menu a {
            color: rgba(255, 255, 255, 0.85);
            padding: 6px 14px;
            border-radius: 40px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: all 0.25s;
            position: relative;
        }
        .nav-menu a:hover,
        .nav-menu a.active {
            background: rgba(255, 255, 255, 0.18);
            color: #fff;
        }
        .nav-menu a i {
            margin-right: 6px;
            font-size: 0.8rem;
        }
        .breadcrumb-wrap {
            background: #fff;
            border-bottom: 1px solid var(--border);
            padding: 10px 0;
            font-size: 0.85rem;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 6px;
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 6px;
            color: var(--text-light);
            font-weight: 600;
        }
        .breadcrumb a {
            color: var(--primary-light);
        }
        .breadcrumb .current {
            color: var(--text-light);
            font-weight: 500;
        }
        .hero {
            background: linear-gradient(135deg, #e8f0fe 0%, #f0f4ff 100%);
            padding: 50px 0 40px;
            text-align: center;
            border-bottom: 1px solid var(--border);
        }
        .hero h1 {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
            margin-bottom: 12px;
        }
        .hero h1 i {
            color: var(--accent);
        }
        .hero p {
            font-size: 1.15rem;
            color: var(--text-light);
            max-width: 700px;
            margin: 0 auto 16px;
        }
        .hero-badge {
            display: inline-block;
            background: var(--accent);
            color: #fff;
            padding: 4px 20px;
            border-radius: 40px;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.3px;
        }
        section {
            padding: 40px 0;
        }
        .section-title {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 12px;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 60px;
            height: 4px;
            background: var(--accent);
            border-radius: 4px;
        }
        .section-title i {
            color: var(--accent);
            margin-right: 10px;
        }
        .card {
            background: var(--card-bg);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 28px 30px;
            margin-bottom: 30px;
            border: 1px solid rgba(0, 0, 0, 0.04);
            transition: transform 0.2s, box-shadow 0.2s;
        }
        .card:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.10);
        }
        .card h2,
        .card h3,
        .card h4 {
            color: var(--primary);
            margin-bottom: 10px;
        }
        .card h2 {
            font-size: 1.5rem;
        }
        .card h3 {
            font-size: 1.2rem;
        }
        .card h4 {
            font-size: 1.05rem;
            font-weight: 600;
        }
        .card p {
            margin-bottom: 14px;
            color: var(--text);
        }
        .card p:last-child {
            margin-bottom: 0;
        }
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 24px;
        }
        .highlight-box {
            background: #fef9e7;
            border-left: 5px solid var(--accent);
            padding: 18px 22px;
            border-radius: 0 var(--radius) var(--radius) 0;
            margin: 20px 0;
        }
        .highlight-box strong {
            color: var(--primary);
        }
        .insight-box {
            background: #eaf3fa;
            border-radius: var(--radius);
            padding: 20px 24px;
            margin: 20px 0;
            border: 1px solid #d4e4f0;
        }
        .insight-box i {
            color: var(--primary-light);
            margin-right: 8px;
        }
        .featured-image {
            margin: 30px 0;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .featured-image img {
            width: 100%;
            height: auto;
            object-fit: cover;
        }
        .featured-image figcaption {
            background: var(--card-bg);
            padding: 12px 20px;
            font-size: 0.85rem;
            color: var(--text-light);
            text-align: center;
            border-top: 1px solid var(--border);
        }
        .interactive-area {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 24px;
            margin: 30px 0;
        }
        .form-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 24px 22px;
            border: 1px solid rgba(0, 0, 0, 0.04);
        }
        .form-card h3 {
            font-size: 1.15rem;
            margin-bottom: 14px;
            color: var(--primary);
        }
        .form-card h3 i {
            color: var(--accent);
            margin-right: 8px;
        }
        .form-group {
            margin-bottom: 14px;
        }
        .form-group label {
            display: block;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 4px;
            color: var(--text-light);
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 10px 14px;
            border: 1px solid var(--border);
            border-radius: 10px;
            font-family: var(--font);
            font-size: 0.95rem;
            transition: border 0.2s, box-shadow 0.2s;
            background: #fff;
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            outline: none;
            border-color: var(--primary-light);
            box-shadow: 0 0 0 3px rgba(30, 111, 160, 0.15);
        }
        .form-group textarea {
            resize: vertical;
            min-height: 70px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px;
            background: var(--primary);
            color: #fff;
            border: none;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.9rem;
            cursor: pointer;
            transition: background 0.25s, transform 0.15s;
        }
        .btn:hover {
            background: var(--primary-light);
            transform: scale(1.02);
        }
        .btn-accent {
            background: var(--accent);
        }
        .btn-accent:hover {
            background: var(--accent-light);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
        }
        .star-rating {
            display: flex;
            gap: 6px;
            font-size: 1.6rem;
            cursor: pointer;
            color: #d5d5d5;
            transition: color 0.2s;
        }
        .star-rating i:hover,
        .star-rating i.active {
            color: var(--accent);
        }
        .table-wrap {
            overflow-x: auto;
            margin: 20px 0;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.9rem;
            background: var(--card-bg);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        thead {
            background: var(--primary);
            color: #fff;
        }
        th,
        td {
            padding: 12px 16px;
            text-align: left;
            border-bottom: 1px solid var(--border);
        }
        th {
            font-weight: 600;
            font-size: 0.85rem;
            letter-spacing: 0.3px;
        }
        tr:last-child td {
            border-bottom: none;
        }
        tr:hover td {
            background: #f1f7fd;
        }
        .site-footer {
            background: var(--primary);
            color: rgba(255, 255, 255, 0.85);
            padding: 40px 0 20px;
            margin-top: 40px;
        }
        .footer-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 32px;
        }
        .footer-inner h4 {
            color: #fff;
            font-size: 1.1rem;
            margin-bottom: 14px;
            position: relative;
            padding-bottom: 8px;
        }
        .footer-inner h4::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 30px;
            height: 3px;
            background: var(--accent);
            border-radius: 4px;
        }
        .footer-inner a {
            color: rgba(255, 255, 255, 0.75);
            display: block;
            padding: 3px 0;
            font-size: 0.9rem;
            transition: color 0.2s;
        }
        .footer-inner a:hover {
            color: var(--accent-light);
        }
        .footer-bottom {
            max-width: var(--max-width);
            margin: 20px auto 0;
            padding: 16px 20px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.15);
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            font-size: 0.85rem;
        }
        .footer-bottom p {
            margin: 0;
        }
        friend-link {
            display: block;
            margin: 8px 0;
        }
        friend-link a {
            display: inline-block;
            margin-right: 16px;
            color: rgba(255, 255, 255, 0.8);
        }
        friend-link a:hover {
            color: var(--accent-light);
        }
        @media (max-width: 992px) {
            .grid-3 {
                grid-template-columns: 1fr 1fr;
            }
            .interactive-area {
                grid-template-columns: 1fr 1fr;
            }
            .footer-inner {
                grid-template-columns: 1fr 1fr;
            }
            .hero h1 {
                font-size: 2rem;
            }
        }
        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            .nav-menu {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: stretch;
                padding: 12px 0 4px;
                gap: 4px;
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-menu a {
                padding: 10px 16px;
                border-radius: 8px;
            }
            .grid-2,
            .grid-3 {
                grid-template-columns: 1fr;
            }
            .interactive-area {
                grid-template-columns: 1fr;
            }
            .footer-inner {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
                gap: 8px;
            }
            .hero h1 {
                font-size: 1.6rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .card {
                padding: 20px 18px;
            }
            .header-inner {
                padding: 10px 16px;
            }
            .my-logo {
                font-size: 1.4rem;
            }
            .breadcrumb-wrap {
                font-size: 0.75rem;
                padding: 6px 0;
            }
            .star-rating {
                font-size: 1.4rem;
            }
            table {
                font-size: 0.8rem;
            }
            th,
            td {
                padding: 8px 10px;
            }
        }
        @media (max-width: 480px) {
            .hero {
                padding: 30px 0 24px;
            }
            section {
                padding: 24px 0;
            }
            .container {
                padding: 0 14px;
            }
            .btn {
                padding: 8px 18px;
                font-size: 0.8rem;
            }
            .form-card {
                padding: 16px 14px;
            }
        }
        .emoji-lg {
            font-size: 1.4rem;
        }
        .tag {
            display: inline-block;
            background: #e8f0fe;
            color: var(--primary);
            padding: 2px 12px;
            border-radius: 40px;
            font-size: 0.75rem;
            font-weight: 600;
            margin-right: 4px;
        }
        .last-updated {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--text-light);
            font-size: 0.85rem;
            background: #f1f3f5;
            padding: 4px 16px;
            border-radius: 40px;
        }
        .last-updated i {
            color: var(--accent);
        }
        .toc {
            background: var(--card-bg);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 20px 24px;
            margin-bottom: 30px;
            border: 1px solid rgba(0, 0, 0, 0.04);
        }
        .toc h3 {
            margin-bottom: 12px;
        }
        .toc ul {
            list-style: none;
            padding: 0;
            columns: 2;
            column-gap: 24px;
        }
        .toc li {
            padding: 4px 0;
            break-inside: avoid;
        }
        .toc a {
            color: var(--primary-light);
            font-weight: 500;
        }
        .toc a:hover {
            color: var(--accent);
        }
        @media (max-width: 600px) {
            .toc ul {
                columns: 1;
            }
        }