* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Roboto, system-ui, -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;
            background: #f4f7fc;
            color: #1e2a3a;
            line-height: 1.7;
            font-size: 16px;
            padding: 0 16px;
        }
        a {
            color: #0a66c2;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: #06407a;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: #ffffff;
            box-shadow: 0 0 40px rgba(0, 0, 0, 0.05);
            border-radius: 20px;
            padding: 24px 28px;
            margin-top: 20px;
            margin-bottom: 40px;
        }
        @media (max-width: 640px) {
            body {
                padding: 0 8px;
            }
            .container {
                padding: 16px 14px;
                border-radius: 12px;
                margin-top: 12px;
            }
        }
        .site-header {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding-bottom: 18px;
            border-bottom: 2px solid #e2e8f0;
            margin-bottom: 12px;
            position: relative;
        }
        .my-logo {
            font-size: 1.6rem;
            font-weight: 800;
            color: #0e1c2f;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #1a3a5c, #2d6a4f);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            display: inline-block;
            transition: transform 0.2s ease;
        }
        .my-logo:hover {
            transform: scale(1.02);
            text-decoration: none;
        }
        .my-logo small {
            font-size: 0.75rem;
            font-weight: 400;
            color: #4a5b6e;
            background: none;
            -webkit-text-fill-color: #4a5b6e;
            display: inline-block;
            margin-left: 8px;
        }
        @media (max-width: 500px) {
            .my-logo {
                font-size: 1.2rem;
            }
            .my-logo small {
                font-size: 0.6rem;
                margin-left: 4px;
            }
        }
        .nav-bar {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-links {
            display: flex;
            gap: 6px 16px;
            flex-wrap: wrap;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .nav-links li a {
            font-weight: 500;
            padding: 6px 10px;
            border-radius: 30px;
            background: transparent;
            transition: background 0.2s, color 0.2s;
            font-size: 0.9rem;
            color: #2c3e50;
        }
        .nav-links li a:hover {
            background: #e2e8f0;
            color: #0a66c2;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.6rem;
            color: #1e2a3a;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 8px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: #e2e8f0;
        }
        @media (max-width: 800px) {
            .hamburger {
                display: block;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #f8fafc;
                border-radius: 16px;
                padding: 12px 16px;
                margin-top: 12px;
                box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
                border: 1px solid #e2e8f0;
            }
            .nav-links.open {
                display: flex;
            }
            .nav-links li a {
                padding: 10px 12px;
                border-radius: 12px;
                display: block;
            }
            .nav-bar {
                flex-wrap: wrap;
                justify-content: flex-end;
            }
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            font-size: 0.85rem;
            color: #5a6a7a;
            margin-bottom: 18px;
            padding: 8px 0;
            border-bottom: 1px solid #edf2f7;
        }
        .breadcrumb a {
            color: #3b6e9c;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb span {
            margin: 0 6px;
            color: #8a9aa8;
        }
        h1 {
            font-size: 2.4rem;
            font-weight: 800;
            color: #0b1a2b;
            margin: 0 0 12px 0;
            line-height: 1.2;
            letter-spacing: -0.3px;
        }
        h2 {
            font-size: 1.8rem;
            font-weight: 700;
            color: #16324b;
            margin: 40px 0 16px 0;
            padding-bottom: 6px;
            border-bottom: 3px solid #d4e0ec;
        }
        h3 {
            font-size: 1.35rem;
            font-weight: 600;
            color: #1f3e5a;
            margin: 28px 0 12px 0;
        }
        h4 {
            font-size: 1.1rem;
            font-weight: 600;
            color: #2c4a68;
            margin: 20px 0 8px 0;
        }
        @media (max-width: 640px) {
            h1 {
                font-size: 1.6rem;
            }
            h2 {
                font-size: 1.3rem;
            }
            h3 {
                font-size: 1.1rem;
            }
            h4 {
                font-size: 1rem;
            }
        }
        p {
            margin-bottom: 16px;
            color: #1f2a3a;
        }
        .lead {
            font-size: 1.2rem;
            font-weight: 400;
            color: #2a4055;
            border-left: 4px solid #3b82c4;
            padding-left: 18px;
            margin: 20px 0 24px 0;
            background: #f0f5fb;
            border-radius: 0 12px 12px 0;
            padding: 16px 20px;
        }
        .highlight {
            background: #fef9e7;
            padding: 2px 8px;
            border-radius: 6px;
            font-weight: 600;
        }
        .stat-box {
            background: #f0f5fc;
            border-radius: 16px;
            padding: 20px 24px;
            margin: 20px 0;
            border-left: 6px solid #2563eb;
        }
        .stat-box ul {
            list-style: none;
            padding: 0;
        }
        .stat-box ul li {
            padding: 6px 0;
            border-bottom: 1px solid #dce5ef;
        }
        .stat-box ul li:last-child {
            border-bottom: none;
        }
        .emoji-big {
            font-size: 1.8rem;
            margin-right: 6px;
        }
        .insight {
            background: #eef7ee;
            border-radius: 16px;
            padding: 18px 22px;
            margin: 20px 0;
            border-left: 6px solid #2d6a4f;
        }
        .feature-image {
            margin: 28px 0;
            border-radius: 20px;
            overflow: hidden;
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.08);
        }
        .feature-image img {
            width: 100%;
            height: auto;
            display: block;
        }
        .feature-image figcaption {
            background: #f1f5f9;
            padding: 10px 16px;
            font-size: 0.85rem;
            color: #3b5068;
            text-align: center;
        }
        .search-box {
            background: #eef3f9;
            border-radius: 60px;
            padding: 6px 6px 6px 20px;
            display: flex;
            align-items: center;
            max-width: 480px;
            margin: 24px 0;
            border: 1px solid #cbd8e8;
            transition: box-shadow 0.2s;
        }
        .search-box:focus-within {
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
            border-color: #2563eb;
        }
        .search-box input {
            flex: 1;
            border: none;
            background: transparent;
            padding: 12px 8px;
            font-size: 1rem;
            outline: none;
            color: #1e2a3a;
        }
        .search-box button {
            background: #2563eb;
            color: #fff;
            border: none;
            border-radius: 60px;
            padding: 10px 22px;
            font-weight: 600;
            font-size: 0.9rem;
            cursor: pointer;
            transition: background 0.2s;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .search-box button:hover {
            background: #1a4fba;
        }
        .feedback-section {
            display: flex;
            flex-wrap: wrap;
            gap: 24px 40px;
            margin: 40px 0 20px;
            padding: 24px 0;
            border-top: 2px solid #e2e8f0;
            border-bottom: 2px solid #e2e8f0;
        }
        .feedback-card {
            flex: 1 1 280px;
            background: #f8faff;
            border-radius: 20px;
            padding: 20px 24px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.03);
            border: 1px solid #e6edf6;
        }
        .feedback-card h4 {
            margin-top: 0;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .feedback-card textarea,
        .feedback-card input,
        .feedback-card select {
            width: 100%;
            padding: 10px 14px;
            border-radius: 12px;
            border: 1px solid #cbd8e8;
            font-size: 0.95rem;
            background: #fff;
            margin: 6px 0 12px;
            resize: vertical;
            font-family: inherit;
        }
        .feedback-card textarea:focus,
        .feedback-card input:focus,
        .feedback-card select:focus {
            outline: none;
            border-color: #2563eb;
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
        }
        .feedback-card .btn-submit {
            background: #1f3e5a;
            color: #fff;
            border: none;
            border-radius: 40px;
            padding: 10px 24px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
            font-size: 0.9rem;
        }
        .feedback-card .btn-submit:hover {
            background: #0b2a44;
        }
        .star-rating {
            display: flex;
            gap: 4px;
            font-size: 1.6rem;
            color: #d1d9e6;
            cursor: pointer;
            margin: 8px 0;
        }
        .star-rating .fas.fa-star {
            color: #f5b342;
        }
        .star-rating .far.fa-star {
            color: #cbd8e8;
        }
        .site-footer {
            margin-top: 40px;
            padding-top: 24px;
            border-top: 2px solid #e2e8f0;
            font-size: 0.9rem;
            color: #3b5068;
        }
        .footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 12px 28px;
            margin-bottom: 18px;
        }
        .footer-links a {
            color: #2c4a68;
        }
        .footer-links a:hover {
            color: #0a66c2;
        }
        .footer-copy {
            background: #f1f5f9;
            padding: 14px 20px;
            border-radius: 14px;
            text-align: center;
            color: #2f4055;
            font-size: 0.85rem;
        }
        friend-link {
            display: block;
            background: #f0f5fc;
            padding: 16px 20px;
            border-radius: 16px;
            margin: 16px 0 24px;
            font-weight: 500;
            border: 1px solid #d4e0ec;
        }
        friend-link a {
            display: inline-block;
            margin: 4px 14px 4px 0;
            padding: 4px 0;
        }
        friend-link a::before {
            content: "🔗 ";
            font-size: 0.8rem;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            font-size: 0.95rem;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 1px 8px rgba(0, 0, 0, 0.04);
        }
        th {
            background: #1f3e5a;
            color: #fff;
            padding: 12px 16px;
            text-align: left;
            font-weight: 600;
        }
        td {
            padding: 10px 16px;
            border-bottom: 1px solid #e2e8f0;
        }
        tr:nth-child(even) {
            background: #f9fcff;
        }
        tr:hover td {
            background: #eef5fb;
        }
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
            margin: 20px 0;
        }
        @media (max-width: 720px) {
            .grid-2 {
                grid-template-columns: 1fr;
            }
        }
        .last-updated {
            font-size: 0.85rem;
            color: #5a7a92;
            background: #f1f6fb;
            display: inline-block;
            padding: 4px 16px;
            border-radius: 40px;
            margin-bottom: 16px;
        }
        .badge {
            background: #16324b;
            color: #fff;
            font-size: 0.7rem;
            padding: 2px 10px;
            border-radius: 40px;
            font-weight: 600;
            letter-spacing: 0.3px;
        }
        hr {
            border: none;
            border-top: 2px dashed #d4e0ec;
            margin: 32px 0;
        }
        .toc {
            background: #f8fafc;
            border-radius: 16px;
            padding: 18px 24px;
            border: 1px solid #e2e8f0;
            margin: 20px 0;
        }
        .toc ol {
            margin-left: 20px;
            color: #1e3a5a;
        }
        .toc ol li {
            padding: 4px 0;
        }
        .toc ol li a {
            color: #1f3e5a;
        }