*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Roboto, system-ui, -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
            background: #f5f7fa;
            color: #1e2a3a;
            line-height: 1.7;
            padding: 0;
            margin: 0;
        }
        a {
            color: #1a6bb0;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: #0d4a7a;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        ul,
        ol {
            padding-left: 1.5rem;
            margin-bottom: 1.2rem;
        }
        li {
            margin-bottom: 0.4rem;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.25;
            color: #0b1a2b;
            margin-top: 2rem;
            margin-bottom: 1rem;
            font-weight: 700;
            letter-spacing: -0.01em;
        }
        h1 {
            font-size: 2.4rem;
            margin-top: 0.5rem;
        }
        h2 {
            font-size: 1.8rem;
            border-bottom: 2px solid #e2e8f0;
            padding-bottom: 0.4rem;
        }
        h3 {
            font-size: 1.35rem;
            color: #1e3a5f;
        }
        h4 {
            font-size: 1.1rem;
            color: #2d4a6e;
        }
        p {
            margin-bottom: 1.2rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, #0f2b4b 0%, #1a4a7a 100%);
            color: #fff;
            padding: 0.8rem 0;
            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;
            flex-wrap: wrap;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .my-logo {
            font-size: 1.6rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
            text-decoration: none;
        }
        .my-logo i {
            color: #ffd966;
            font-size: 1.8rem;
        }
        .my-logo:hover {
            color: #ffd966;
            text-decoration: none;
        }
        .my-logo span {
            font-weight: 300;
            color: #b8d4f0;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 1.2rem;
        }
        .main-nav a {
            color: #e0edff;
            font-weight: 500;
            font-size: 0.95rem;
            padding: 0.4rem 0.8rem;
            border-radius: 6px;
            transition: background 0.2s, color 0.2s;
        }
        .main-nav a:hover {
            background: rgba(255, 255, 255, 0.15);
            color: #fff;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.2rem 0.5rem;
            border-radius: 6px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .breadcrumb {
            background: #e9edf2;
            padding: 0.7rem 0;
            font-size: 0.9rem;
            border-bottom: 1px solid #dce2ea;
        }
        .breadcrumb .container {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 0.3rem 0.6rem;
        }
        .breadcrumb a {
            color: #1a6bb0;
        }
        .breadcrumb span {
            color: #5a6f84;
        }
        .breadcrumb .sep {
            color: #a0b3c9;
            font-weight: 300;
        }
        .page-wrap {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 2.5rem;
            max-width: 1200px;
            margin: 2rem auto;
            padding: 0 20px;
        }
        .main-content {
            min-width: 0;
        }
        .sidebar {
            background: #ffffff;
            border-radius: 16px;
            padding: 1.8rem 1.5rem;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
            border: 1px solid #eef2f7;
            height: fit-content;
            position: sticky;
            top: 100px;
        }
        .sidebar h3 {
            margin-top: 0;
            font-size: 1.2rem;
            color: #0b1a2b;
            border-bottom: 2px solid #e2e8f0;
            padding-bottom: 0.5rem;
            margin-bottom: 1rem;
        }
        .sidebar ul {
            list-style: none;
            padding-left: 0;
        }
        .sidebar li {
            margin-bottom: 0.6rem;
            border-bottom: 1px solid #f0f3f8;
            padding-bottom: 0.6rem;
        }
        .sidebar a {
            font-weight: 500;
            display: block;
            padding: 0.2rem 0;
        }
        .search-box {
            background: #ffffff;
            border-radius: 12px;
            padding: 1.5rem 1.2rem;
            margin-bottom: 2rem;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
            border: 1px solid #eef2f7;
        }
        .search-box h3 {
            margin-top: 0;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .search-form {
            display: flex;
            gap: 0.6rem;
            margin-top: 0.8rem;
        }
        .search-form input {
            flex: 1;
            padding: 0.7rem 1rem;
            border: 1px solid #d0d9e6;
            border-radius: 8px;
            font-size: 1rem;
            outline: none;
            transition: border 0.2s;
        }
        .search-form input:focus {
            border-color: #1a6bb0;
            box-shadow: 0 0 0 3px rgba(26, 107, 176, 0.1);
        }
        .search-form button {
            background: #1a6bb0;
            color: #fff;
            border: none;
            padding: 0.7rem 1.4rem;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
            font-size: 1rem;
        }
        .search-form button:hover {
            background: #0d4a7a;
        }
        .featured-image-wrap {
            margin: 1.8rem 0 2.2rem;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
            background: #e9edf2;
        }
        .featured-image-wrap img {
            width: 100%;
            display: block;
        }
        .featured-image-wrap figcaption {
            padding: 0.8rem 1.2rem;
            background: #f8faff;
            font-size: 0.9rem;
            color: #4a5f75;
            border-top: 1px solid #e2e8f0;
        }
        .user-feedback {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.8rem;
            margin: 2.5rem 0;
            background: #ffffff;
            border-radius: 16px;
            padding: 1.8rem 2rem;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
            border: 1px solid #eef2f7;
        }
        .feedback-section h3 {
            margin-top: 0;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .feedback-section textarea {
            width: 100%;
            padding: 0.8rem 1rem;
            border: 1px solid #d0d9e6;
            border-radius: 8px;
            font-size: 0.95rem;
            font-family: inherit;
            resize: vertical;
            min-height: 100px;
            outline: none;
            transition: border 0.2s;
        }
        .feedback-section textarea:focus {
            border-color: #1a6bb0;
            box-shadow: 0 0 0 3px rgba(26, 107, 176, 0.08);
        }
        .feedback-section input[type="text"],
        .feedback-section input[type="number"] {
            width: 100%;
            padding: 0.7rem 1rem;
            border: 1px solid #d0d9e6;
            border-radius: 8px;
            font-size: 0.95rem;
            outline: none;
            transition: border 0.2s;
            margin-bottom: 0.8rem;
        }
        .feedback-section input:focus {
            border-color: #1a6bb0;
            box-shadow: 0 0 0 3px rgba(26, 107, 176, 0.08);
        }
        .feedback-section .submit-btn {
            background: #1a6bb0;
            color: #fff;
            border: none;
            padding: 0.7rem 1.8rem;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
            font-size: 0.95rem;
        }
        .feedback-section .submit-btn:hover {
            background: #0d4a7a;
        }
        .star-rating {
            display: flex;
            gap: 4px;
            font-size: 1.8rem;
            color: #ffca3a;
            margin-bottom: 0.8rem;
            cursor: pointer;
        }
        .star-rating i {
            transition: transform 0.15s, color 0.15s;
        }
        .star-rating i:hover {
            transform: scale(1.2);
            color: #f0b400;
        }
        .site-footer {
            background: #0f2b4b;
            color: #c8d9ee;
            padding: 2.5rem 0 1.5rem;
            margin-top: 3rem;
            border-top: 4px solid #1a6bb0;
        }
        .footer-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2.5rem;
        }
        .footer-inner h4 {
            color: #fff;
            margin-top: 0;
            font-size: 1.1rem;
            border-bottom: 1px solid #2a4a6e;
            padding-bottom: 0.5rem;
            margin-bottom: 1rem;
        }
        .footer-inner a {
            color: #b8d4f0;
        }
        .footer-inner a:hover {
            color: #ffd966;
        }
        .footer-bottom {
            max-width: 1200px;
            margin: 1.5rem auto 0;
            padding: 1.2rem 20px 0;
            border-top: 1px solid #2a4a6e;
            text-align: center;
            font-size: 0.9rem;
            color: #8aa3bf;
        }
        .footer-bottom .copyright {
            font-weight: 400;
        }
        friend-link {
            display: block;
            margin-top: 0.8rem;
        }
        friend-link a {
            display: inline-block;
            margin-right: 1.2rem;
            margin-bottom: 0.4rem;
        }
        .last-updated {
            display: inline-block;
            background: #eef4fa;
            padding: 0.3rem 1rem;
            border-radius: 20px;
            font-size: 0.85rem;
            color: #2d5a7a;
            margin-bottom: 1.2rem;
            font-weight: 500;
        }
        .last-updated i {
            margin-right: 6px;
        }
        @media (max-width: 992px) {
            .page-wrap {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
                order: 2;
                margin-top: 2rem;
            }
            .footer-inner {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 768px) {
            .header-inner {
                flex-wrap: wrap;
            }
            .hamburger {
                display: block;
            }
            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                gap: 0.3rem;
                padding: 1rem 0 0.5rem;
                border-top: 1px solid rgba(255, 255, 255, 0.1);
                margin-top: 0.8rem;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 0.6rem 0.8rem;
                border-radius: 6px;
                width: 100%;
            }
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            .user-feedback {
                grid-template-columns: 1fr;
            }
            .footer-inner {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .search-form {
                flex-direction: column;
            }
            .search-form button {
                width: 100%;
            }
            .featured-image-wrap {
                margin: 1rem 0 1.5rem;
            }
        }
        @media (max-width: 480px) {
            .container,
            .header-inner,
            .page-wrap,
            .footer-inner,
            .footer-bottom {
                padding-left: 14px;
                padding-right: 14px;
            }
            .my-logo {
                font-size: 1.3rem;
            }
            .breadcrumb {
                font-size: 0.8rem;
            }
            .sidebar {
                padding: 1.2rem 1rem;
            }
            .feedback-section textarea {
                min-height: 80px;
            }
        }
        .highlight-box {
            background: #f0f6ff;
            border-left: 4px solid #1a6bb0;
            padding: 1rem 1.5rem;
            border-radius: 0 12px 12px 0;
            margin: 1.5rem 0;
        }
        .highlight-box strong {
            color: #0b1a2b;
        }
        .pro-tip {
            background: #fefcf0;
            border-left: 4px solid #f5b342;
            padding: 1rem 1.5rem;
            border-radius: 0 12px 12px 0;
            margin: 1.5rem 0;
        }
        .pro-tip strong {
            color: #8a6a1a;
        }
        .stat-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 1rem;
            margin: 1.8rem 0;
        }
        .stat-card {
            background: #fff;
            border-radius: 12px;
            padding: 1.2rem 1rem;
            text-align: center;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
            border: 1px solid #eef2f7;
        }
        .stat-card .num {
            font-size: 2.2rem;
            font-weight: 800;
            color: #1a6bb0;
            display: block;
        }
        .stat-card .label {
            font-size: 0.9rem;
            color: #5a6f84;
        }
        .table-wrap {
            overflow-x: auto;
            margin: 1.8rem 0;
        }
        .table-wrap table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.95rem;
            background: #fff;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
        }
        .table-wrap th {
            background: #0f2b4b;
            color: #fff;
            padding: 0.8rem 1rem;
            text-align: left;
            font-weight: 600;
        }
        .table-wrap td {
            padding: 0.7rem 1rem;
            border-bottom: 1px solid #eef2f7;
        }
        .table-wrap tr:last-child td {
            border-bottom: none;
        }
        .table-wrap tr:hover td {
            background: #f8fbff;
        }
        .btn {
            display: inline-block;
            background: #1a6bb0;
            color: #fff;
            padding: 0.5rem 1.4rem;
            border-radius: 8px;
            font-weight: 600;
            transition: background 0.2s;
            border: none;
            cursor: pointer;
            font-size: 0.95rem;
        }
        .btn:hover {
            background: #0d4a7a;
            text-decoration: none;
        }
        .toc {
            background: #fff;
            border-radius: 12px;
            padding: 1.5rem 1.8rem;
            border: 1px solid #eef2f7;
            margin: 1.8rem 0;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
        }
        .toc summary {
            font-size: 1.2rem;
            font-weight: 700;
            cursor: pointer;
            color: #0b1a2b;
            padding: 0.3rem 0;
        }
        .toc ol {
            margin-top: 1rem;
            margin-bottom: 0;
        }
        .toc a {
            color: #1a6bb0;
        }
        .toc a:hover {
            text-decoration: underline;
        }
        .inline-icon {
            margin-right: 6px;
        }
        .emoji-big {
            font-size: 1.4rem;
            vertical-align: middle;
        }
        .tag {
            display: inline-block;
            background: #e2e8f0;
            padding: 0.15rem 0.7rem;
            border-radius: 12px;
            font-size: 0.8rem;
            color: #2d4a6e;
            font-weight: 500;
        }