*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Roboto, -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
            background: #f4f7fc;
            color: #1a1a2e;
            line-height: 1.7;
            font-size: 16px;
        }
        a {
            color: #3b82f6;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #7c3aed;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            border-radius: 12px;
        }
        ul,
        ol {
            padding-left: 1.25rem;
            margin-bottom: 1rem;
        }
        li {
            margin-bottom: 0.35rem;
        }
        strong {
            font-weight: 700;
            color: #0f172a;
        }
        h1,
        h2,
        h3,
        h4 {
            color: #0f172a;
            font-weight: 700;
            line-height: 1.25;
            margin-top: 1.8rem;
            margin-bottom: 0.75rem;
        }
        h1 {
            font-size: 2.2rem;
            margin-top: 0.5rem;
            border-bottom: 4px solid #7c3aed;
            padding-bottom: 0.4rem;
            display: inline-block;
        }
        h2 {
            font-size: 1.75rem;
            border-left: 6px solid #7c3aed;
            padding-left: 1rem;
            margin-top: 2.2rem;
        }
        h3 {
            font-size: 1.35rem;
            margin-top: 1.6rem;
        }
        h4 {
            font-size: 1.1rem;
            font-weight: 600;
            margin-top: 1.2rem;
        }
        p {
            margin-bottom: 1.1rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.2rem;
        }
        .site-header {
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
            color: #fff;
            padding: 0 0 0.2rem 0;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding: 0.8rem 0;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            background: linear-gradient(135deg, #fbbf24, #7c3aed);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.5px;
        }
        .my-logo i {
            -webkit-text-fill-color: #fbbf24;
            margin-right: 0.3rem;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.2rem 0.6rem;
            border-radius: 8px;
            transition: background 0.2s;
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .nav-menu {
            display: flex;
            gap: 1.2rem;
            flex-wrap: wrap;
            align-items: center;
        }
        .nav-menu a {
            color: #e2e8f0;
            font-weight: 500;
            font-size: 0.95rem;
            padding: 0.3rem 0.6rem;
            border-radius: 6px;
            transition: background 0.2s, color 0.2s;
        }
        .nav-menu a:hover {
            background: rgba(255, 255, 255, 0.12);
            color: #fbbf24;
            text-decoration: none;
        }
        .nav-menu a i {
            margin-right: 0.35rem;
        }
        .breadcrumb {
            background: #e9edf5;
            padding: 0.5rem 0;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            padding: 0;
            margin: 0;
            gap: 0.3rem 0.6rem;
        }
        .breadcrumb li {
            margin: 0;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 0.5rem;
            color: #64748b;
        }
        .breadcrumb a {
            color: #3b82f6;
        }
        .breadcrumb .current {
            color: #475569;
            font-weight: 500;
        }
        .hero {
            background: linear-gradient(145deg, #1e1b4b 0%, #0f172a 100%);
            color: #fff;
            padding: 2.8rem 0 2.2rem;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .hero::after {
            content: "✦";
            font-size: 14rem;
            opacity: 0.04;
            position: absolute;
            right: -2rem;
            top: -3rem;
            color: #fbbf24;
            pointer-events: none;
        }
        .hero h1 {
            color: #fff;
            border-bottom-color: #fbbf24;
            font-size: 2.6rem;
        }
        .hero p {
            font-size: 1.15rem;
            max-width: 780px;
            margin: 1rem auto 0;
            color: #cbd5e1;
        }
        .hero .badge {
            display: inline-block;
            background: #7c3aed;
            padding: 0.25rem 1.2rem;
            border-radius: 40px;
            font-size: 0.85rem;
            font-weight: 600;
            color: #fff;
            margin-top: 1rem;
            letter-spacing: 0.5px;
        }
        .hero .badge i {
            margin-right: 0.4rem;
        }
        .main-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            padding: 2.5rem 0;
        }
        .content-area {
            min-width: 0;
        }
        .sidebar {
            position: sticky;
            top: 5.5rem;
            align-self: start;
        }
        .sidebar-box {
            background: #fff;
            border-radius: 16px;
            padding: 1.2rem 1.4rem;
            margin-bottom: 1.6rem;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
            border: 1px solid #e9edf5;
        }
        .sidebar-box h4 {
            font-size: 1.1rem;
            margin-top: 0;
            border-bottom: 2px solid #e9edf5;
            padding-bottom: 0.5rem;
            margin-bottom: 0.8rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .sidebar-box ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .sidebar-box li {
            padding: 0.35rem 0;
            border-bottom: 1px solid #f1f5f9;
        }
        .sidebar-box li:last-child {
            border-bottom: none;
        }
        .sidebar-box a {
            font-weight: 500;
            font-size: 0.92rem;
        }
        .search-form {
            display: flex;
            gap: 0.4rem;
            margin-bottom: 1.8rem;
            background: #fff;
            padding: 0.4rem;
            border-radius: 60px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
            border: 1px solid #e9edf5;
        }
        .search-form input {
            flex: 1;
            border: none;
            padding: 0.7rem 1.2rem;
            font-size: 1rem;
            border-radius: 40px;
            outline: none;
            background: transparent;
            font-family: inherit;
        }
        .search-form button {
            background: #7c3aed;
            color: #fff;
            border: none;
            padding: 0.7rem 1.6rem;
            border-radius: 40px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            font-size: 0.95rem;
        }
        .search-form button:hover {
            background: #6d28d9;
            transform: scale(1.02);
        }
        .search-form button i {
            margin-right: 0.4rem;
        }
        .styled-table {
            width: 100%;
            border-collapse: collapse;
            background: #fff;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
            margin: 1.2rem 0 1.8rem;
        }
        .styled-table thead {
            background: #1e293b;
            color: #fff;
        }
        .styled-table th {
            padding: 0.8rem 1rem;
            text-align: left;
            font-weight: 600;
            font-size: 0.95rem;
        }
        .styled-table td {
            padding: 0.7rem 1rem;
            border-bottom: 1px solid #f1f5f9;
        }
        .styled-table tbody tr:hover {
            background: #f8fafc;
        }
        .feedback-section {
            background: #fff;
            border-radius: 20px;
            padding: 1.8rem 2rem;
            margin: 2.5rem 0;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
            border: 1px solid #e9edf5;
        }
        .feedback-section h3 {
            margin-top: 0;
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            margin-top: 1.2rem;
        }
        .feedback-item label {
            font-weight: 600;
            display: block;
            margin-bottom: 0.3rem;
            font-size: 0.95rem;
        }
        .feedback-item textarea {
            width: 100%;
            border: 2px solid #e2e8f0;
            border-radius: 12px;
            padding: 0.8rem 1rem;
            font-size: 0.95rem;
            font-family: inherit;
            resize: vertical;
            min-height: 90px;
            transition: border 0.2s;
        }
        .feedback-item textarea:focus {
            border-color: #7c3aed;
            outline: none;
        }
        .feedback-item input[type="number"] {
            width: 100%;
            border: 2px solid #e2e8f0;
            border-radius: 12px;
            padding: 0.7rem 1rem;
            font-size: 1rem;
            transition: border 0.2s;
        }
        .feedback-item input[type="number"]:focus {
            border-color: #7c3aed;
            outline: none;
        }
        .feedback-item .star-desc {
            font-size: 0.85rem;
            color: #64748b;
            margin-top: 0.2rem;
        }
        .btn-feedback {
            background: #7c3aed;
            color: #fff;
            border: none;
            padding: 0.7rem 2rem;
            border-radius: 40px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            font-size: 1rem;
            margin-top: 0.8rem;
        }
        .btn-feedback:hover {
            background: #6d28d9;
            transform: scale(1.02);
        }
        .btn-feedback i {
            margin-right: 0.4rem;
        }
        .content-img {
            margin: 1.8rem 0;
            border-radius: 16px;
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.10);
        }
        .fig-caption {
            font-size: 0.85rem;
            color: #64748b;
            text-align: center;
            margin-top: 0.3rem;
            font-style: italic;
        }
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 2.5rem 0 1.8rem;
            margin-top: 2rem;
        }
        .footer-inner {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2rem;
        }
        .footer-inner h4 {
            color: #fbbf24;
            margin-top: 0;
            font-size: 1.1rem;
        }
        .footer-inner a {
            color: #94a3b8;
        }
        .footer-inner a:hover {
            color: #fbbf24;
        }
        .footer-bottom {
            border-top: 1px solid #1e293b;
            padding-top: 1.2rem;
            margin-top: 1.8rem;
            text-align: center;
            font-size: 0.85rem;
            color: #64748b;
        }
        .footer-bottom .copyright {
            font-weight: 500;
        }
        friend-link {
            display: block;
            background: #1e293b;
            padding: 1rem 1.4rem;
            border-radius: 12px;
            margin-top: 1rem;
            font-size: 0.9rem;
        }
        friend-link a {
            display: inline-block;
            margin: 0.2rem 0.8rem 0.2rem 0;
            color: #94a3b8;
        }
        friend-link a:hover {
            color: #fbbf24;
        }
        @media (max-width: 992px) {
            .main-grid {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 1rem;
            }
            .sidebar-box {
                margin-bottom: 0;
            }
            .footer-inner {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                width: 100%;
                flex-direction: column;
                padding: 0.8rem 0 0.4rem;
                gap: 0.4rem;
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-toggle {
                display: block;
            }
            .header-inner {
                padding: 0.5rem 0;
            }
            .hero h1 {
                font-size: 1.8rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .feedback-grid {
                grid-template-columns: 1fr;
                gap: 1.2rem;
            }
            .sidebar {
                grid-template-columns: 1fr;
            }
            .footer-inner {
                grid-template-columns: 1fr;
            }
            .styled-table {
                font-size: 0.85rem;
            }
            .styled-table th,
            .styled-table td {
                padding: 0.5rem 0.6rem;
            }
            .search-form {
                flex-wrap: wrap;
                border-radius: 20px;
            }
            .search-form input {
                width: 100%;
                flex: 0 0 100%;
            }
            .search-form button {
                width: 100%;
                border-radius: 30px;
            }
        }
        @media (max-width: 480px) {
            body {
                font-size: 15px;
            }
            h1 {
                font-size: 1.5rem;
            }
            h2 {
                font-size: 1.3rem;
            }
            h3 {
                font-size: 1.1rem;
            }
            .my-logo {
                font-size: 1.3rem;
            }
            .container {
                padding: 0 0.8rem;
            }
            .feedback-section {
                padding: 1.2rem 1rem;
            }
        }
        .scroll-top {
            position: fixed;
            right: 1.2rem;
            bottom: 1.8rem;
            background: #7c3aed;
            color: #fff;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            box-shadow: 0 4px 16px rgba(124, 58, 237, 0.35);
            cursor: pointer;
            border: none;
            transition: transform 0.2s, background 0.2s;
            z-index: 50;
        }
        .scroll-top:hover {
            transform: scale(1.08);
            background: #6d28d9;
        }
        .tag {
            display: inline-block;
            background: #e9edf5;
            padding: 0.15rem 0.7rem;
            border-radius: 30px;
            font-size: 0.75rem;
            font-weight: 600;
            color: #475569;
            margin-right: 0.3rem;
        }
        .divider {
            border: none;
            height: 2px;
            background: linear-gradient(to right, transparent, #7c3aed, transparent);
            margin: 2rem 0;
        }
        .highlight-box {
            background: #f0f4ff;
            border-left: 5px solid #7c3aed;
            padding: 1.2rem 1.6rem;
            border-radius: 0 12px 12px 0;
            margin: 1.5rem 0;
        }
        .highlight-box p:last-child {
            margin-bottom: 0;
        }
        .emoji-lg {
            font-size: 1.3rem;
        }