*,
        *::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, sans-serif;
            background: #0d0f14;
            color: #e8edf2;
            line-height: 1.75;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a {
            color: #7ec8e3;
            text-decoration: none;
            transition: color 0.25s ease;
        }
        a:hover,
        a:focus-visible {
            color: #b3e4ff;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        ul,
        ol {
            padding-left: 1.5rem;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            color: #f0f4fa;
            margin-top: 1.8rem;
            margin-bottom: 0.6rem;
        }
        h1 {
            font-size: 2.4rem;
            margin-top: 0.5rem;
            border-bottom: 3px solid #4a6fa5;
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 1.8rem;
            border-left: 5px solid #6a8fc0;
            padding-left: 0.8rem;
        }
        h3 {
            font-size: 1.4rem;
            color: #c8d8f0;
        }
        h4 {
            font-size: 1.15rem;
            color: #aac0dd;
        }
        p {
            margin-bottom: 1rem;
            color: #d6dee8;
        }
        strong {
            color: #f0f7ff;
            font-weight: 600;
        }
        hr {
            border: none;
            border-top: 1px solid #2a3140;
            margin: 2rem 0;
        }
        blockquote {
            border-left: 4px solid #6a8fc0;
            padding: 0.8rem 1.2rem;
            margin: 1.2rem 0;
            background: #151b26;
            border-radius: 0 10px 10px 0;
            font-style: italic;
            color: #c0ccdd;
        }
        code {
            background: #1e2635;
            padding: 0.2rem 0.5rem;
            border-radius: 6px;
            font-size: 0.9rem;
            color: #c8d8f0;
        }
        .wrapper {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.2rem;
            flex: 1;
        }
        .site-header {
            background: #131a26;
            border-bottom: 2px solid #2a3a52;
            padding: 0.8rem 0;
            position: sticky;
            top: 0;
            z-index: 100;
            backdrop-filter: blur(6px);
            background: rgba(13, 15, 20, 0.96);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.2rem;
            flex-wrap: wrap;
            gap: 0.6rem;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            background: linear-gradient(135deg, #7ec8e3, #4a8fc5);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .my-logo i {
            -webkit-text-fill-color: initial;
            color: #6a8fc0;
            font-size: 1.6rem;
        }
        .my-logo:hover {
            opacity: 0.85;
            text-decoration: none;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: #e8edf2;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.2rem 0.4rem;
            border-radius: 6px;
            transition: background 0.2s;
        }
        .nav-toggle:hover {
            background: #1e2a3a;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 0.2rem;
            flex-wrap: wrap;
        }
        .main-nav a {
            padding: 0.5rem 0.9rem;
            border-radius: 8px;
            font-weight: 500;
            font-size: 0.9rem;
            color: #c8d8f0;
            transition: background 0.2s, color 0.2s;
            white-space: nowrap;
        }
        .main-nav a:hover,
        .main-nav a:focus-visible {
            background: #1e2a3a;
            color: #ffffff;
            text-decoration: none;
        }
        .main-nav a.active {
            background: #2a3a52;
            color: #ffffff;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 0.4rem;
            padding: 0.8rem 0 0.2rem;
            font-size: 0.85rem;
            color: #8899b0;
        }
        .breadcrumb a {
            color: #7ec8e3;
        }
        .breadcrumb a:hover {
            color: #b3e4ff;
        }
        .breadcrumb .sep {
            color: #4a5a70;
        }
        .toc {
            background: #151b26;
            border: 1px solid #2a3a52;
            border-radius: 14px;
            padding: 1.5rem 1.8rem;
            margin: 1.8rem 0 2.4rem;
        }
        .toc summary {
            font-weight: 700;
            font-size: 1.2rem;
            cursor: pointer;
            color: #b3cce8;
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        .toc ol {
            margin-top: 0.8rem;
            columns: 1;
            list-style: decimal;
            padding-left: 1.8rem;
        }
        .toc li {
            margin-bottom: 0.3rem;
        }
        .toc li a {
            color: #a0b8d4;
        }
        .toc li a:hover {
            color: #ffffff;
        }
        .content-area {
            padding: 1.2rem 0 2rem;
        }
        .content-area img {
            margin: 1.8rem auto;
            border-radius: 14px;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.6);
            max-width: 100%;
        }
        .content-area figure {
            margin: 1.8rem 0;
            text-align: center;
        }
        .content-area figcaption {
            font-size: 0.85rem;
            color: #8899b0;
            margin-top: 0.4rem;
        }
        .stat-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 1rem;
            margin: 1.8rem 0;
        }
        .stat-card {
            background: #151b26;
            border: 1px solid #2a3a52;
            border-radius: 12px;
            padding: 1.2rem 0.8rem;
            text-align: center;
            transition: transform 0.2s, box-shadow 0.2s;
        }
        .stat-card:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 24px rgba(74, 111, 165, 0.25);
        }
        .stat-card .num {
            font-size: 2.2rem;
            font-weight: 800;
            color: #7ec8e3;
            display: block;
        }
        .stat-card .label {
            font-size: 0.85rem;
            color: #8899b0;
            margin-top: 0.2rem;
        }
        .table-wrap {
            overflow-x: auto;
            margin: 1.5rem 0;
            border-radius: 12px;
            border: 1px solid #2a3a52;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            background: #11171f;
            font-size: 0.9rem;
        }
        th,
        td {
            padding: 0.8rem 1rem;
            text-align: left;
            border-bottom: 1px solid #1e2635;
        }
        th {
            background: #1a2332;
            font-weight: 600;
            color: #b3cce8;
            white-space: nowrap;
        }
        tr:hover td {
            background: #1a2332;
        }
        .search-box {
            display: flex;
            gap: 0.5rem;
            max-width: 520px;
            margin: 1.8rem 0;
            flex-wrap: wrap;
        }
        .search-box input {
            flex: 1;
            padding: 0.7rem 1.2rem;
            border: 1px solid #2a3a52;
            border-radius: 30px;
            background: #131a26;
            color: #e8edf2;
            font-size: 0.95rem;
            outline: none;
            transition: border 0.3s, box-shadow 0.3s;
            min-width: 180px;
        }
        .search-box input:focus {
            border-color: #6a8fc0;
            box-shadow: 0 0 0 3px rgba(106, 143, 192, 0.25);
        }
        .search-box button {
            padding: 0.7rem 1.6rem;
            border: none;
            border-radius: 30px;
            background: #4a6fa5;
            color: #fff;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.25s, transform 0.1s;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .search-box button:hover {
            background: #5a80b8;
            transform: scale(1.02);
        }
        .rating-section {
            background: #151b26;
            border: 1px solid #2a3a52;
            border-radius: 14px;
            padding: 1.8rem;
            margin: 2rem 0;
        }
        .star-group {
            display: flex;
            gap: 0.3rem;
            font-size: 2rem;
            cursor: pointer;
            color: #4a5a70;
            transition: color 0.15s;
        }
        .star-group i {
            transition: color 0.15s, transform 0.15s;
        }
        .star-group i:hover,
        .star-group i.active {
            color: #f7c948;
            transform: scale(1.1);
        }
        .star-group i.selected {
            color: #f7c948;
        }
        .rating-result {
            margin-top: 0.6rem;
            font-size: 1rem;
            color: #b0c4dd;
        }
        .comment-section {
            background: #151b26;
            border: 1px solid #2a3a52;
            border-radius: 14px;
            padding: 1.8rem;
            margin: 2rem 0;
        }
        .comment-section textarea {
            width: 100%;
            padding: 0.8rem 1.2rem;
            border: 1px solid #2a3a52;
            border-radius: 12px;
            background: #0d0f14;
            color: #e8edf2;
            font-size: 0.95rem;
            resize: vertical;
            min-height: 110px;
            outline: none;
            transition: border 0.3s;
        }
        .comment-section textarea:focus {
            border-color: #6a8fc0;
        }
        .comment-section .form-group {
            margin-bottom: 1rem;
        }
        .comment-section .form-group label {
            display: block;
            font-weight: 500;
            margin-bottom: 0.3rem;
            color: #b0c4dd;
        }
        .comment-section input[type="text"] {
            width: 100%;
            padding: 0.6rem 1rem;
            border: 1px solid #2a3a52;
            border-radius: 8px;
            background: #0d0f14;
            color: #e8edf2;
            outline: none;
        }
        .comment-section input[type="text"]:focus {
            border-color: #6a8fc0;
        }
        .btn-primary {
            padding: 0.7rem 2rem;
            border: none;
            border-radius: 30px;
            background: #4a6fa5;
            color: #fff;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.25s, transform 0.1s;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }
        .btn-primary:hover {
            background: #5a80b8;
            transform: scale(1.02);
        }
        .btn-secondary {
            padding: 0.6rem 1.4rem;
            border: 1px solid #2a3a52;
            border-radius: 30px;
            background: transparent;
            color: #c8d8f0;
            cursor: pointer;
            transition: background 0.2s;
        }
        .btn-secondary:hover {
            background: #1e2a3a;
        }
        .site-footer {
            background: #0a0e16;
            border-top: 2px solid #1a2636;
            padding: 2rem 0 1.5rem;
            margin-top: 2.5rem;
        }
        .footer-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.2rem;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 1.5rem;
        }
        .footer-col {
            flex: 1 1 220px;
        }
        .footer-col h4 {
            font-size: 1rem;
            margin-bottom: 0.8rem;
            color: #b0c4dd;
            border-bottom: 1px solid #1e2a3a;
            padding-bottom: 0.3rem;
        }
        .footer-col a {
            display: block;
            padding: 0.25rem 0;
            font-size: 0.9rem;
            color: #8899b0;
        }
        .footer-col a:hover {
            color: #7ec8e3;
        }
        friend-link {
            display: block;
            padding: 0.6rem 0;
        }
        friend-link a {
            display: inline-block;
            margin-right: 1.2rem;
            color: #7ec8e3;
        }
        .copyright {
            text-align: center;
            padding: 1.2rem 1.2rem 0;
            font-size: 0.8rem;
            color: #5a6a80;
            border-top: 1px solid #1a2636;
            margin-top: 1.2rem;
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            h3 {
                font-size: 1.15rem;
            }
            .header-inner {
                flex-wrap: wrap;
            }
            .nav-toggle {
                display: block;
            }
            .main-nav {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #131a26;
                padding: 0.8rem 0;
                border-radius: 0 0 12px 12px;
                gap: 0.1rem;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 0.6rem 1.2rem;
                width: 100%;
                border-radius: 0;
            }
            .toc ol {
                columns: 1;
            }
            .stat-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .search-box button span {
                display: none;
            }
            .footer-inner {
                flex-direction: column;
            }
        }
        @media (max-width: 480px) {
            .wrapper {
                padding: 0 0.8rem;
            }
            .stat-grid {
                grid-template-columns: 1fr;
            }
            .star-group {
                font-size: 1.6rem;
            }
        }
        @media (min-width: 769px) {
            .main-nav {
                display: flex !important;
            }
        }
        .text-muted {
            color: #8899b0;
        }
        .text-accent {
            color: #7ec8e3;
        }
        .flex-between {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
        }
        .gap-1 {
            gap: 1rem;
        }
        .mt-1 {
            margin-top: 1rem;
        }
        .mt-2 {
            margin-top: 2rem;
        }
        .mb-1 {
            margin-bottom: 1rem;
        }
        .mb-2 {
            margin-bottom: 2rem;
        }
        .last-updated {
            font-size: 0.85rem;
            color: #6a7a90;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            margin: 0.5rem 0 1.2rem;
        }
        .last-updated i {
            color: #6a8fc0;
        }
        .anchor-offset {
            scroll-margin-top: 80px;
        }