* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: #f5f7fa;
            color: #1a1a2e;
            line-height: 1.7;
            font-size: 16px;
        }
        a {
            color: #0f4c81;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #e74c3c;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, #0f4c81, #1a1a2e);
            color: #fff;
            padding: 15px 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
        }
        header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: #f9ca24;
            letter-spacing: 1px;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
            transition: transform 0.2s;
        }
        .my-logo:hover {
            transform: scale(1.03);
            text-decoration: none;
            color: #f9ca24;
        }
        .my-logo span {
            color: #fff;
        }
        .my-logo i {
            margin-right: 8px;
            color: #2ecc71;
        }
        nav {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        nav a {
            color: #f0f0f0;
            padding: 8px 16px;
            border-radius: 6px;
            font-weight: 500;
            font-size: 0.95rem;
            transition: background 0.2s, color 0.2s;
        }
        nav a:hover {
            background: rgba(255, 255, 255, 0.15);
            color: #f9ca24;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: 2px solid #f0f0f0;
            color: #fff;
            font-size: 1.5rem;
            padding: 6px 12px;
            border-radius: 6px;
            cursor: pointer;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .breadcrumb {
            background: #eef2f7;
            padding: 12px 0;
            border-bottom: 1px solid #dce3ed;
        }
        .breadcrumb ul {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 6px 12px;
            align-items: center;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 10px;
            color: #888;
            font-weight: 700;
        }
        .breadcrumb a {
            color: #0f4c81;
            font-size: 0.9rem;
        }
        .breadcrumb li:last-child a {
            color: #555;
            pointer-events: none;
        }
        main {
            padding: 40px 0;
        }
        h1 {
            font-size: 2.6rem;
            color: #0f4c81;
            margin-bottom: 20px;
            line-height: 1.2;
            border-left: 6px solid #f9ca24;
            padding-left: 20px;
        }
        h2 {
            font-size: 2rem;
            color: #1a1a2e;
            margin: 48px 0 16px;
            padding-bottom: 8px;
            border-bottom: 3px solid #f9ca24;
        }
        h3 {
            font-size: 1.5rem;
            color: #0f4c81;
            margin: 32px 0 12px;
        }
        h4 {
            font-size: 1.2rem;
            color: #2c3e50;
            margin: 24px 0 10px;
            font-weight: 600;
        }
        p {
            margin: 0 0 18px;
            color: #2d3436;
        }
        .highlight {
            background: #fef9e7;
            padding: 2px 8px;
            border-radius: 4px;
            font-weight: 600;
        }
        .emoji {
            font-size: 1.2rem;
        }
        .card {
            background: #fff;
            border-radius: 16px;
            padding: 28px 32px;
            margin-bottom: 32px;
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.06);
            transition: transform 0.2s, box-shadow 0.2s;
        }
        .card:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 36px rgba(0, 0, 0, 0.1);
        }
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 24px;
        }
        .feature-list {
            list-style: none;
            padding: 0;
        }
        .feature-list li {
            padding: 12px 0 12px 36px;
            position: relative;
            border-bottom: 1px solid #eee;
        }
        .feature-list li::before {
            content: "✅";
            position: absolute;
            left: 0;
            top: 12px;
            font-size: 1.1rem;
        }
        .featured-image {
            border-radius: 16px;
            overflow: hidden;
            margin: 32px 0;
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.1);
        }
        .featured-image img {
            width: 100%;
            height: auto;
            display: block;
        }
        .featured-image figcaption {
            background: #f0f4f8;
            padding: 12px 20px;
            font-size: 0.9rem;
            color: #555;
            font-style: italic;
        }
        .search-box {
            background: #fff;
            border-radius: 60px;
            padding: 6px 6px 6px 24px;
            display: flex;
            align-items: center;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
            max-width: 560px;
            margin: 20px 0 30px;
            border: 1px solid #dce3ed;
            transition: box-shadow 0.2s;
        }
        .search-box:focus-within {
            box-shadow: 0 6px 24px rgba(15, 76, 129, 0.12);
            border-color: #0f4c81;
        }
        .search-box input {
            flex: 1;
            border: none;
            padding: 14px 10px;
            font-size: 1rem;
            outline: none;
            background: transparent;
            font-family: inherit;
        }
        .search-box button {
            background: #0f4c81;
            color: #fff;
            border: none;
            padding: 12px 28px;
            border-radius: 40px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
        }
        .search-box button:hover {
            background: #1a1a2e;
            transform: scale(1.02);
        }
        .comment-form,
        .rating-form {
            background: #fff;
            border-radius: 16px;
            padding: 28px 32px;
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.06);
            margin-bottom: 28px;
        }
        .comment-form h3,
        .rating-form h3 {
            margin-top: 0;
        }
        .comment-form input,
        .comment-form textarea,
        .rating-form select {
            width: 100%;
            padding: 14px 18px;
            border: 1px solid #dce3ed;
            border-radius: 10px;
            font-size: 1rem;
            font-family: inherit;
            margin-bottom: 16px;
            transition: border-color 0.2s;
        }
        .comment-form input:focus,
        .comment-form textarea:focus,
        .rating-form select:focus {
            border-color: #0f4c81;
            outline: none;
            box-shadow: 0 0 0 3px rgba(15, 76, 129, 0.08);
        }
        .comment-form textarea {
            min-height: 120px;
            resize: vertical;
        }
        .btn {
            background: #0f4c81;
            color: #fff;
            border: none;
            padding: 14px 32px;
            border-radius: 40px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            display: inline-block;
        }
        .btn:hover {
            background: #1a1a2e;
            transform: scale(1.02);
            text-decoration: none;
        }
        .btn-secondary {
            background: #6c7a89;
        }
        .btn-secondary:hover {
            background: #4a5568;
        }
        .comment-list {
            margin-top: 20px;
        }
        .comment-item {
            background: #f8fafc;
            border-radius: 12px;
            padding: 18px 22px;
            margin-bottom: 14px;
            border-left: 4px solid #f9ca24;
        }
        .comment-item strong {
            color: #0f4c81;
        }
        .comment-item .date {
            font-size: 0.8rem;
            color: #888;
            margin-left: 10px;
        }
        .rating-display {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
            margin: 12px 0 20px;
        }
        .stars {
            color: #f9ca24;
            font-size: 1.4rem;
            letter-spacing: 2px;
        }
        .rating-value {
            font-size: 1.2rem;
            font-weight: 700;
            color: #0f4c81;
        }
        .links-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px 18px;
            padding: 16px 0;
        }
        .links-list a {
            background: #eef2f7;
            padding: 6px 16px;
            border-radius: 30px;
            font-size: 0.9rem;
            transition: background 0.2s, color 0.2s;
        }
        .links-list a:hover {
            background: #0f4c81;
            color: #fff;
            text-decoration: none;
        }
        footer {
            background: #1a1a2e;
            color: #ddd;
            padding: 48px 0 28px;
            margin-top: 40px;
        }
        footer .container {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 32px;
        }
        footer h4 {
            color: #f9ca24;
            margin-bottom: 16px;
            font-size: 1.1rem;
        }
        footer a {
            color: #bbb;
        }
        footer a:hover {
            color: #f9ca24;
            text-decoration: none;
        }
        .footer-links {
            list-style: none;
            padding: 0;
        }
        .footer-links li {
            padding: 4px 0;
        }
        .copyright {
            grid-column: 1 / -1;
            border-top: 1px solid #2d3436;
            padding-top: 24px;
            margin-top: 24px;
            text-align: center;
            font-size: 0.9rem;
            color: #999;
        }
        friend-link {
            display: block;
            margin-top: 16px;
            padding: 12px 0;
            border-top: 1px solid #2d3436;
        }
        friend-link a {
            display: inline-block;
            margin: 4px 12px 4px 0;
            padding: 4px 12px;
            background: rgba(255, 255, 255, 0.05);
            border-radius: 20px;
            font-size: 0.9rem;
        }
        friend-link a:hover {
            background: rgba(255, 255, 255, 0.12);
        }
        .last-updated {
            display: inline-block;
            background: #eef2f7;
            padding: 6px 18px;
            border-radius: 30px;
            font-size: 0.85rem;
            color: #666;
            margin-bottom: 20px;
        }
        .last-updated i {
            margin-right: 6px;
            color: #0f4c81;
        }
        .toc {
            background: #f0f4f8;
            border-radius: 16px;
            padding: 24px 28px;
            margin-bottom: 32px;
            border: 1px solid #dce3ed;
        }
        .toc h3 {
            margin-top: 0;
        }
        .toc ul {
            list-style: none;
            padding: 0;
            columns: 2;
            column-gap: 32px;
        }
        .toc li {
            padding: 4px 0;
            break-inside: avoid;
        }
        .toc a {
            display: block;
            padding: 4px 0;
        }
        .toc a::before {
            content: "📖 ";
        }
        @media (max-width: 992px) {
            .grid-2,
            .grid-3 {
                grid-template-columns: 1fr;
            }
            footer .container {
                grid-template-columns: 1fr 1fr;
            }
            .toc ul {
                columns: 1;
            }
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 1.9rem;
                padding-left: 14px;
            }
            h2 {
                font-size: 1.5rem;
            }
            h3 {
                font-size: 1.25rem;
            }
            .container {
                padding: 0 14px;
            }
            .card {
                padding: 20px 18px;
            }
            .search-box {
                border-radius: 30px;
                flex-wrap: wrap;
                padding: 6px;
            }
            .search-box input {
                padding: 10px 14px;
                width: 100%;
            }
            .search-box button {
                width: 100%;
                border-radius: 30px;
                padding: 12px;
                margin-top: 4px;
            }
            nav {
                display: none;
                width: 100%;
                flex-direction: column;
                gap: 4px;
                padding: 16px 0 8px;
            }
            nav.show {
                display: flex;
            }
            nav a {
                padding: 10px 16px;
                border-radius: 8px;
                width: 100%;
            }
            .hamburger {
                display: block;
            }
            footer .container {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .toc ul {
                columns: 1;
            }
            .comment-form,
            .rating-form {
                padding: 20px 18px;
            }
            header .container {
                position: relative;
            }
            .my-logo {
                font-size: 1.4rem;
            }
        }
        @media (max-width: 480px) {
            h1 {
                font-size: 1.6rem;
            }
            .grid-2,
            .grid-3 {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .rating-display {
                flex-direction: column;
                align-items: flex-start;
            }
        }
        :target {
            scroll-margin-top: 100px;
        }
        .lead {
            font-size: 1.15rem;
            color: #2c3e50;
            font-weight: 400;
            line-height: 1.9;
        }
        .stat-box {
            background: linear-gradient(135deg, #0f4c81, #1a1a2e);
            color: #fff;
            border-radius: 16px;
            padding: 24px 28px;
            text-align: center;
        }
        .stat-box .number {
            font-size: 2.8rem;
            font-weight: 800;
            color: #f9ca24;
            display: block;
        }
        .stat-box .label {
            font-size: 1rem;
            opacity: 0.9;
        }
        .inline-icon {
            margin-right: 6px;
            color: #f9ca24;
        }
        blockquote {
            border-left: 4px solid #f9ca24;
            padding: 12px 24px;
            margin: 24px 0;
            background: #f8fafc;
            border-radius: 0 12px 12px 0;
            font-style: italic;
            color: #2c3e50;
        }
        .tag {
            display: inline-block;
            background: #eef2f7;
            padding: 2px 14px;
            border-radius: 30px;
            font-size: 0.8rem;
            color: #0f4c81;
            font-weight: 600;
            margin: 2px 4px 2px 0;
        }