*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background: #f8f9fa;
            color: #1a1a2e;
            line-height: 1.7;
            padding: 0;
            margin: 0;
        }
        a {
            color: #2563eb;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #1d4ed8;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
            color: #fff;
            padding: 12px 0;
            position: sticky;
            top: 0;
            z-index: 999;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 1.9rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(120deg, #f7971e, #ffd200);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-shadow: none;
            transition: transform 0.2s;
            display: inline-block;
        }
        .my-logo:hover {
            transform: scale(1.02);
            text-decoration: none;
        }
        .my-logo small {
            font-size: 0.7rem;
            -webkit-text-fill-color: #aaa;
            color: #aaa;
            background: none;
            display: block;
            font-weight: 400;
            letter-spacing: 1px;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: 2px solid rgba(255, 255, 255, 0.4);
            color: #fff;
            font-size: 1.6rem;
            padding: 6px 14px;
            border-radius: 8px;
            cursor: pointer;
            transition: 0.2s;
        }
        .nav-toggle:hover {
            border-color: #f7971e;
            color: #f7971e;
        }
        .main-nav {
            display: flex;
            gap: 6px;
            flex-wrap: wrap;
            align-items: center;
        }
        .main-nav a {
            color: #ddd;
            padding: 8px 16px;
            border-radius: 30px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: 0.25s;
            white-space: nowrap;
        }
        .main-nav a:hover,
        .main-nav a.active {
            background: rgba(247, 151, 30, 0.18);
            color: #ffd200;
            text-decoration: none;
        }
        .main-nav a i {
            margin-right: 6px;
        }
        .breadcrumb-wrap {
            background: #fff;
            border-bottom: 1px solid #e9ecef;
            padding: 10px 0;
            font-size: 0.85rem;
        }
        .breadcrumb-wrap nav ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            align-items: center;
        }
        .breadcrumb-wrap nav ol li {
            display: flex;
            align-items: center;
            gap: 6px;
            color: #6c757d;
        }
        .breadcrumb-wrap nav ol li+li::before {
            content: "›";
            color: #adb5bd;
            font-size: 1.2rem;
            margin-right: 4px;
        }
        .breadcrumb-wrap nav ol li a {
            color: #2563eb;
        }
        .breadcrumb-wrap nav ol li a:hover {
            text-decoration: underline;
        }
        .breadcrumb-wrap nav ol li [aria-current="page"] {
            color: #1a1a2e;
            font-weight: 600;
        }
        .hero {
            background: linear-gradient(145deg, #1e1b4b, #312e81);
            color: #fff;
            padding: 50px 0 40px;
            margin-bottom: 32px;
            border-radius: 0 0 40px 40px;
        }
        .hero h1 {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.15;
            letter-spacing: -0.5px;
            margin-bottom: 16px;
        }
        .hero h1 span {
            background: linear-gradient(120deg, #f7971e, #ffd200);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: 1.2rem;
            opacity: 0.9;
            max-width: 720px;
            margin-bottom: 24px;
        }
        .hero-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            font-size: 0.95rem;
            opacity: 0.8;
        }
        .hero-meta i {
            margin-right: 6px;
        }
        .search-section {
            background: #fff;
            border-radius: 60px;
            padding: 6px 6px 6px 24px;
            display: flex;
            align-items: center;
            max-width: 560px;
            margin: 20px 0 0;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
        }
        .search-section input {
            flex: 1;
            border: none;
            outline: none;
            padding: 14px 8px;
            font-size: 1rem;
            background: transparent;
            color: #1a1a2e;
            min-width: 0;
        }
        .search-section input::placeholder {
            color: #999;
        }
        .search-section button {
            background: linear-gradient(135deg, #f7971e, #ffd200);
            border: none;
            color: #1a1a2e;
            font-weight: 700;
            padding: 12px 28px;
            border-radius: 40px;
            cursor: pointer;
            font-size: 1rem;
            transition: 0.25s;
            display: flex;
            align-items: center;
            gap: 8px;
            white-space: nowrap;
        }
        .search-section button:hover {
            transform: scale(1.04);
            box-shadow: 0 4px 15px rgba(247, 151, 30, 0.5);
        }
        .main-grid {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 40px;
            margin: 30px 0 50px;
        }
        .main-content {
            min-width: 0;
        }
        .sidebar {
            min-width: 0;
        }
        .main-content h2 {
            font-size: 2rem;
            font-weight: 700;
            margin: 48px 0 16px;
            padding-bottom: 8px;
            border-bottom: 4px solid #f7971e;
            display: inline-block;
        }
        .main-content h2 i {
            color: #f7971e;
            margin-right: 10px;
        }
        .main-content h3 {
            font-size: 1.5rem;
            font-weight: 600;
            margin: 32px 0 12px;
            color: #1e1b4b;
        }
        .main-content h3 i {
            color: #f7971e;
            margin-right: 8px;
        }
        .main-content h4 {
            font-size: 1.2rem;
            font-weight: 600;
            margin: 24px 0 10px;
            color: #302b63;
        }
        .main-content p {
            margin-bottom: 16px;
            font-size: 1.02rem;
            color: #2d2d44;
        }
        .main-content ul,
        .main-content ol {
            margin: 12px 0 20px 24px;
        }
        .main-content li {
            margin-bottom: 8px;
        }
        .main-content .highlight-box {
            background: #f0f4ff;
            border-left: 6px solid #f7971e;
            padding: 20px 24px;
            border-radius: 12px;
            margin: 24px 0;
        }
        .main-content .highlight-box p {
            margin-bottom: 6px;
        }
        .main-content .stat-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 16px;
            margin: 24px 0;
        }
        .main-content .stat-card {
            background: #fff;
            border-radius: 16px;
            padding: 20px;
            text-align: center;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.06);
            border: 1px solid #e9ecef;
        }
        .main-content .stat-card .num {
            font-size: 2.2rem;
            font-weight: 800;
            color: #f7971e;
        }
        .main-content .stat-card .label {
            color: #6c757d;
            font-size: 0.9rem;
        }
        .main-content .feature-img {
            border-radius: 20px;
            margin: 28px 0;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
            width: 100%;
        }
        .sidebar .card {
            background: #fff;
            border-radius: 20px;
            padding: 24px;
            margin-bottom: 28px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
            border: 1px solid #eef2f7;
        }
        .sidebar .card h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 16px;
            color: #1e1b4b;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .sidebar .card h3 i {
            color: #f7971e;
        }
        .sidebar .link-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .sidebar .link-list li {
            padding: 8px 0;
            border-bottom: 1px solid #f0f0f5;
        }
        .sidebar .link-list li:last-child {
            border-bottom: none;
        }
        .sidebar .link-list li a {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.95rem;
        }
        .sidebar .link-list li a i {
            color: #f7971e;
            font-size: 0.8rem;
        }
        .interact-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin: 40px 0 30px;
        }
        .interact-card {
            background: #fff;
            border-radius: 20px;
            padding: 28px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
            border: 1px solid #eef2f7;
        }
        .interact-card h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 18px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .interact-card h3 i {
            color: #f7971e;
        }
        .interact-card form {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .interact-card form input,
        .interact-card form textarea,
        .interact-card form select {
            padding: 12px 16px;
            border: 1px solid #dde1e6;
            border-radius: 12px;
            font-size: 0.95rem;
            font-family: inherit;
            background: #fafbfc;
            transition: 0.2s;
            width: 100%;
        }
        .interact-card form input:focus,
        .interact-card form textarea:focus,
        .interact-card form select:focus {
            outline: none;
            border-color: #f7971e;
            box-shadow: 0 0 0 3px rgba(247, 151, 30, 0.15);
        }
        .interact-card form textarea {
            min-height: 100px;
            resize: vertical;
        }
        .interact-card form button {
            background: linear-gradient(135deg, #f7971e, #ffd200);
            border: none;
            color: #1a1a2e;
            font-weight: 700;
            padding: 14px 20px;
            border-radius: 40px;
            cursor: pointer;
            font-size: 1rem;
            transition: 0.25s;
        }
        .interact-card form button:hover {
            transform: scale(1.02);
            box-shadow: 0 4px 15px rgba(247, 151, 30, 0.4);
        }
        .star-rating {
            display: flex;
            gap: 4px;
            font-size: 1.8rem;
            cursor: pointer;
            direction: rtl;
            justify-content: flex-end;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            color: #ddd;
            transition: 0.2s;
            cursor: pointer;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f7971e;
        }
        .site-footer {
            background: #0f0c29;
            color: #ccc;
            padding: 40px 0 20px;
            margin-top: 60px;
            border-top: 4px solid #f7971e;
        }
        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 30px;
        }
        .site-footer h4 {
            color: #fff;
            font-size: 1.1rem;
            margin-bottom: 14px;
            font-weight: 600;
        }
        .site-footer a {
            color: #bbb;
            font-size: 0.9rem;
        }
        .site-footer a:hover {
            color: #ffd200;
        }
        .site-footer .copy {
            border-top: 1px solid #2a2a4a;
            padding-top: 20px;
            text-align: center;
            font-size: 0.85rem;
            color: #888;
        }
        friend-link {
            display: block;
            margin: 16px 0;
            padding: 12px 16px;
            background: rgba(255, 255, 255, 0.04);
            border-radius: 12px;
            border: 1px solid #2a2a4a;
        }
        friend-link a {
            display: inline-block;
            margin: 4px 12px 4px 0;
            padding: 4px 0;
        }
        @media (max-width: 992px) {
            .main-grid {
                grid-template-columns: 1fr;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .hero h1 {
                font-size: 2.2rem;
            }
        }
        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                padding: 16px 0 8px;
                gap: 2px;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 10px 16px;
                width: 100%;
                border-radius: 10px;
            }
            .header-inner {
                align-items: center;
            }
            .search-section {
                flex-wrap: wrap;
                border-radius: 30px;
                padding: 6px 6px 6px 16px;
            }
            .search-section button {
                padding: 10px 18px;
                font-size: 0.9rem;
            }
            .hero h1 {
                font-size: 1.8rem;
            }
            .interact-grid {
                grid-template-columns: 1fr;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .breadcrumb-wrap nav ol {
                font-size: 0.75rem;
                gap: 4px;
            }
            .main-content h2 {
                font-size: 1.6rem;
            }
            .main-content h3 {
                font-size: 1.3rem;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 14px;
            }
            .hero {
                padding: 30px 0 30px;
            }
            .hero h1 {
                font-size: 1.5rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .my-logo {
                font-size: 1.5rem;
            }
            .search-section input {
                padding: 10px 6px;
                font-size: 0.9rem;
            }
            .search-section button {
                padding: 8px 14px;
                font-size: 0.8rem;
            }
        }
        .last-updated {
            display: inline-block;
            background: #e9ecef;
            padding: 4px 16px;
            border-radius: 30px;
            font-size: 0.85rem;
            color: #495057;
            margin-bottom: 12px;
        }
        .toc {
            background: #f0f4ff;
            border-radius: 16px;
            padding: 20px 24px;
            margin: 24px 0;
            border: 1px solid #dde7f5;
        }
        .toc h3 {
            margin-top: 0;
        }
        .toc ul {
            list-style: none;
            padding: 0;
            margin: 0;
            columns: 2;
            column-gap: 24px;
        }
        .toc ul li {
            padding: 4px 0;
            break-inside: avoid;
        }
        .toc ul li a {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .toc ul li a::before {
            content: "▸";
            color: #f7971e;
        }
        @media (max-width: 600px) {
            .toc ul {
                columns: 1;
            }
        }
        .btn-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: #f7971e;
            color: #1a1a2e;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            box-shadow: 0 4px 15px rgba(247, 151, 30, 0.4);
            cursor: pointer;
            z-index: 99;
            border: none;
            transition: 0.25s;
            opacity: 0.8;
        }
        .btn-top:hover {
            opacity: 1;
            transform: translateY(-4px);
        }