*,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, Roboto, 'Helvetica Neue', sans-serif;
            background: #0d0f14;
            color: #e8edf2;
            line-height: 1.7;
            font-size: 1.05rem;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: #6ec3f7;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover,
        a:focus {
            color: #b8e2ff;
            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: #f0f5fa;
            margin-top: 1.8rem;
            margin-bottom: 0.6rem;
        }
        h1 {
            font-size: 2.6rem;
            margin-top: 0.2rem;
        }
        h2 {
            font-size: 2rem;
            border-bottom: 2px solid #2a3a4e;
            padding-bottom: 0.4rem;
        }
        h3 {
            font-size: 1.5rem;
        }
        h4 {
            font-size: 1.2rem;
        }
        p {
            margin-bottom: 1.2rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.2rem;
        }
        .site-header {
            background: #151a22;
            border-bottom: 2px solid #2a3a4e;
            padding: 0.8rem 0;
            position: sticky;
            top: 0;
            z-index: 100;
            backdrop-filter: blur(6px);
            background: rgba(21, 26, 34, 0.96);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 1.7rem;
            font-weight: 800;
            background: linear-gradient(135deg, #f9a826, #ff6b9d);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.5px;
        }
        .my-logo:hover {
            text-decoration: none;
            opacity: 0.9;
        }
        .my-logo small {
            font-size: 0.8rem;
            -webkit-text-fill-color: #8899aa;
            background: none;
            font-weight: 400;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: 2px solid #3a4a5e;
            color: #e8edf2;
            font-size: 1.6rem;
            padding: 0.3rem 0.9rem;
            border-radius: 8px;
            cursor: pointer;
            transition: background 0.2s;
        }
        .nav-toggle:hover {
            background: #2a3a4e;
        }
        .main-nav {
            display: flex;
            gap: 1.2rem;
            flex-wrap: wrap;
            align-items: center;
        }
        .main-nav a {
            color: #c8d4e0;
            font-weight: 500;
            padding: 0.3rem 0.6rem;
            border-radius: 6px;
            transition: background 0.2s, color 0.2s;
        }
        .main-nav a:hover {
            background: #2a3a4e;
            color: #fff;
            text-decoration: none;
        }
        .breadcrumb {
            background: #1a212b;
            padding: 0.6rem 0;
            font-size: 0.9rem;
            border-bottom: 1px solid #2a3a4e;
        }
        .breadcrumb ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 0.4rem;
            padding: 0;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 0.4rem;
            color: #6a7a8e;
        }
        .breadcrumb a {
            color: #8aa0b8;
        }
        .breadcrumb .current {
            color: #c8d4e0;
            font-weight: 600;
        }
        .hero {
            background: linear-gradient(145deg, #181f2a, #0d1117);
            padding: 2.5rem 0 2rem;
            text-align: center;
        }
        .hero h1 {
            font-size: 3rem;
            background: linear-gradient(135deg, #f9a826, #ff6b9d, #6ec3f7);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: 1.2rem;
            color: #b0c4d8;
            max-width: 780px;
            margin: 0.6rem auto 1.2rem;
        }
        .hero-meta {
            display: flex;
            justify-content: center;
            gap: 2rem;
            flex-wrap: wrap;
            font-size: 0.95rem;
            color: #7a8ea2;
        }
        .hero-meta i {
            margin-right: 0.3rem;
        }
        .search-section {
            background: #151a22;
            padding: 1.5rem 0;
            border-bottom: 1px solid #2a3a4e;
        }
        .search-form {
            display: flex;
            max-width: 580px;
            margin: 0 auto;
            gap: 0.5rem;
        }
        .search-form input {
            flex: 1;
            padding: 0.8rem 1.2rem;
            border: 2px solid #2a3a4e;
            border-radius: 40px;
            background: #0d1117;
            color: #e8edf2;
            font-size: 1rem;
            outline: none;
            transition: border 0.3s;
        }
        .search-form input:focus {
            border-color: #6ec3f7;
        }
        .search-form button {
            background: #6ec3f7;
            border: none;
            border-radius: 40px;
            padding: 0 1.6rem;
            color: #0d1117;
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
        }
        .search-form button:hover {
            background: #8ad0ff;
            transform: scale(1.02);
        }
        .content-wrapper {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 2.5rem;
            padding: 2.5rem 0;
        }
        .main-content {
            min-width: 0;
        }
        .sidebar {
            background: #151a22;
            border-radius: 16px;
            padding: 1.6rem 1.2rem;
            border: 1px solid #2a3a4e;
            align-self: start;
            position: sticky;
            top: 90px;
        }
        .sidebar h3 {
            font-size: 1.2rem;
            margin-top: 0;
            border-bottom: 1px solid #2a3a4e;
            padding-bottom: 0.5rem;
        }
        .sidebar ul {
            list-style: none;
            padding: 0;
        }
        .sidebar li {
            margin-bottom: 0.6rem;
        }
        .sidebar a {
            display: block;
            padding: 0.4rem 0.6rem;
            border-radius: 6px;
            transition: background 0.2s;
        }
        .sidebar a:hover {
            background: #1f2a36;
            text-decoration: none;
        }
        .info-box {
            background: #1a232f;
            border-left: 4px solid #f9a826;
            padding: 1.2rem 1.5rem;
            border-radius: 0 12px 12px 0;
            margin: 1.5rem 0;
        }
        .info-box strong {
            color: #f9a826;
        }
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 1.2rem;
            margin: 1.5rem 0;
        }
        .feature-item {
            background: #151a22;
            padding: 1.2rem;
            border-radius: 12px;
            border: 1px solid #2a3a4e;
            transition: border-color 0.3s, transform 0.2s;
        }
        .feature-item:hover {
            border-color: #6ec3f7;
            transform: translateY(-3px);
        }
        .feature-item i {
            font-size: 1.8rem;
            color: #f9a826;
            margin-bottom: 0.5rem;
        }
        .feature-item h4 {
            margin-top: 0.2rem;
        }
        .system-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.2rem 0;
            background: #151a22;
            border-radius: 12px;
            overflow: hidden;
        }
        .system-table th,
        .system-table td {
            padding: 0.8rem 1rem;
            text-align: left;
            border-bottom: 1px solid #2a3a4e;
        }
        .system-table th {
            background: #1f2a36;
            font-weight: 700;
            color: #f0f5fa;
        }
        .system-table tr:last-child td {
            border-bottom: none;
        }
        .rating-area,
        .comment-area {
            background: #151a22;
            border-radius: 16px;
            padding: 1.6rem 1.5rem;
            border: 1px solid #2a3a4e;
            margin: 2rem 0;
        }
        .rating-area h3,
        .comment-area h3 {
            margin-top: 0;
        }
        .star-group {
            display: flex;
            gap: 0.3rem;
            font-size: 1.8rem;
            color: #4a5a6e;
            cursor: pointer;
            margin: 0.6rem 0;
        }
        .star-group i.active {
            color: #f9a826;
        }
        .star-group i:hover,
        .star-group i.hover {
            color: #f9a826;
        }
        .rating-form button,
        .comment-form button {
            background: #6ec3f7;
            border: none;
            padding: 0.6rem 1.8rem;
            border-radius: 40px;
            font-weight: 700;
            color: #0d1117;
            cursor: pointer;
            transition: background 0.2s;
            font-size: 1rem;
        }
        .rating-form button:hover,
        .comment-form button:hover {
            background: #8ad0ff;
        }
        .comment-form textarea {
            width: 100%;
            padding: 0.8rem 1rem;
            border-radius: 12px;
            border: 2px solid #2a3a4e;
            background: #0d1117;
            color: #e8edf2;
            font-size: 1rem;
            resize: vertical;
            min-height: 90px;
            font-family: inherit;
            transition: border 0.3s;
        }
        .comment-form textarea:focus {
            border-color: #6ec3f7;
            outline: none;
        }
        .comment-form input {
            width: 100%;
            padding: 0.7rem 1rem;
            border-radius: 40px;
            border: 2px solid #2a3a4e;
            background: #0d1117;
            color: #e8edf2;
            font-size: 1rem;
            margin-bottom: 0.8rem;
            transition: border 0.3s;
        }
        .comment-form input:focus {
            border-color: #6ec3f7;
            outline: none;
        }
        .site-footer {
            background: #0d1117;
            border-top: 2px solid #2a3a4e;
            padding: 2rem 0 1.2rem;
            margin-top: 2rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 1.5rem;
        }
        .footer-grid h4 {
            margin-top: 0;
            font-size: 1.1rem;
        }
        .footer-grid ul {
            list-style: none;
            padding: 0;
        }
        .footer-grid li {
            margin-bottom: 0.4rem;
        }
        .footer-grid a {
            color: #8aa0b8;
        }
        .footer-grid a:hover {
            color: #b8e2ff;
        }
        friend-link {
            display: block;
            margin-top: 1rem;
            padding: 0.8rem 1rem;
            background: #151a22;
            border-radius: 12px;
            border: 1px solid #2a3a4e;
        }
        friend-link a {
            display: inline-block;
            margin: 0.2rem 0.6rem 0.2rem 0;
        }
        .copyright {
            text-align: center;
            padding-top: 1.2rem;
            margin-top: 1.2rem;
            border-top: 1px solid #1f2a36;
            font-size: 0.9rem;
            color: #6a7a8e;
        }
        @media (max-width: 900px) {
            .content-wrapper {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
            }
            h1 {
                font-size: 2rem;
            }
            .hero h1 {
                font-size: 2.2rem;
            }
        }
        @media (max-width: 680px) {
            .nav-toggle {
                display: block;
            }
            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                padding: 1rem 0 0.4rem;
                gap: 0.6rem;
            }
            .main-nav.open {
                display: flex;
            }
            .header-inner {
                align-items: center;
            }
            .my-logo {
                font-size: 1.3rem;
            }
            .breadcrumb ol {
                font-size: 0.8rem;
            }
            .hero-meta {
                flex-direction: column;
                gap: 0.4rem;
            }
            .search-form {
                flex-direction: column;
            }
            .search-form button {
                padding: 0.7rem;
            }
            .system-table {
                font-size: 0.85rem;
            }
            .system-table th,
            .system-table td {
                padding: 0.5rem 0.6rem;
            }
            .feature-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 480px) {
            body {
                font-size: 0.95rem;
            }
            h1 {
                font-size: 1.6rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            .container {
                padding: 0 0.8rem;
            }
        }
        .tag {
            display: inline-block;
            background: #2a3a4e;
            padding: 0.1rem 0.7rem;
            border-radius: 30px;
            font-size: 0.75rem;
            font-weight: 600;
            color: #b0c4d8;
            margin-right: 0.3rem;
        }
        .highlight {
            background: linear-gradient(120deg, rgba(249, 168, 38, 0.15), rgba(255, 107, 157, 0.15));
            padding: 0 0.3rem;
            border-radius: 4px;
        }
        .emoji-lg {
            font-size: 1.3rem;
        }
        .updated-badge {
            background: #1f2a36;
            padding: 0.2rem 0.8rem;
            border-radius: 30px;
            font-size: 0.8rem;
            color: #8aa0b8;
        }
        .figure-caption {
            text-align: center;
            font-size: 0.9rem;
            color: #7a8ea2;
            margin-top: 0.4rem;
        }
        blockquote {
            border-left: 4px solid #6ec3f7;
            padding: 0.8rem 1.2rem;
            margin: 1.2rem 0;
            background: #151a22;
            border-radius: 0 12px 12px 0;
            font-style: italic;
            color: #c8d4e0;
        }
        .btn-top {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            background: #2a3a4e;
            color: #e8edf2;
            border: none;
            border-radius: 50%;
            width: 48px;
            height: 48px;
            font-size: 1.4rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.2s;
            z-index: 50;
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0.7;
        }
        .btn-top:hover {
            background: #6ec3f7;
            color: #0d1117;
            transform: translateY(-3px);
            opacity: 1;
        }