*,
        *::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: #f8fafc;
            color: #1e293b;
            line-height: 1.75;
            padding-bottom: 2rem;
        }
        a {
            color: #1d4ed8;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #0f3a9e;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        .container {
            max-width: 1180px;
            margin: 0 auto;
            padding: 0 1.25rem;
        }
        .site-header {
            background: linear-gradient(135deg, #0b1a2e 0%, #1a3a5c 100%);
            color: #fff;
            padding: 1rem 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;
            gap: 0.75rem;
        }
        .my-logo {
            font-size: 1.6rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: #facc15;
            text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
            display: flex;
            align-items: center;
            gap: 0.5rem;
            transition: transform 0.2s;
        }
        .my-logo:hover {
            transform: scale(1.02);
            text-decoration: none;
            color: #fde047;
        }
        .my-logo i {
            font-size: 1.8rem;
            color: #fff;
        }
        .my-logo small {
            font-size: 0.55rem;
            font-weight: 400;
            color: #94a3b8;
            display: block;
            letter-spacing: 0.3px;
        }
        .hamburger {
            display: none;
            background: none;
            border: 2px solid rgba(255, 255, 255, 0.3);
            color: #fff;
            font-size: 1.5rem;
            padding: 0.4rem 0.7rem;
            border-radius: 8px;
            cursor: pointer;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .main-nav {
            display: flex;
            gap: 1.2rem;
            flex-wrap: wrap;
            align-items: center;
        }
        .main-nav a {
            color: #e2e8f0;
            font-weight: 500;
            font-size: 0.95rem;
            padding: 0.4rem 0.2rem;
            border-bottom: 2px solid transparent;
            transition: border-color 0.2s, color 0.2s;
        }
        .main-nav a:hover {
            color: #facc15;
            border-bottom-color: #facc15;
            text-decoration: none;
        }
        .main-nav a i {
            margin-right: 0.3rem;
            font-size: 0.85rem;
        }
        .breadcrumb {
            background: #f1f5f9;
            padding: 0.6rem 0;
            font-size: 0.85rem;
            border-bottom: 1px solid #e2e8f0;
        }
        .breadcrumb .container {
            display: flex;
            flex-wrap: wrap;
            gap: 0.3rem 0.6rem;
        }
        .breadcrumb a {
            color: #475569;
        }
        .breadcrumb a:hover {
            color: #1d4ed8;
        }
        .breadcrumb span.sep {
            color: #94a3b8;
        }
        .breadcrumb .current {
            color: #1e293b;
            font-weight: 600;
        }
        .hero {
            background: linear-gradient(145deg, #0f2b44, #1e4a6f);
            color: #fff;
            padding: 3rem 0 2.5rem;
            margin-bottom: 2.5rem;
            border-radius: 0 0 32px 32px;
        }
        .hero h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -0.5px;
            margin-bottom: 0.75rem;
        }
        .hero h1 i {
            color: #facc15;
        }
        .hero p {
            font-size: 1.1rem;
            color: #cbd5e1;
            max-width: 720px;
        }
        .hero .meta-info {
            display: flex;
            flex-wrap: wrap;
            gap: 1.2rem;
            margin-top: 1.2rem;
            font-size: 0.9rem;
            color: #94a3b8;
        }
        .hero .meta-info span i {
            margin-right: 0.4rem;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            margin: 2rem 0;
        }
        .main-content {
            background: #fff;
            border-radius: 20px;
            padding: 2rem 2.2rem;
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
        }
        .sidebar {
            position: sticky;
            top: 90px;
            align-self: start;
        }
        .main-content h2 {
            font-size: 1.8rem;
            font-weight: 700;
            margin: 2.2rem 0 1rem 0;
            color: #0f2b44;
            border-left: 5px solid #facc15;
            padding-left: 1rem;
        }
        .main-content h2:first-of-type {
            margin-top: 0;
        }
        .main-content h3 {
            font-size: 1.35rem;
            font-weight: 600;
            margin: 1.8rem 0 0.8rem 0;
            color: #1e4a6f;
        }
        .main-content h4 {
            font-size: 1.1rem;
            font-weight: 600;
            margin: 1.2rem 0 0.5rem 0;
            color: #334155;
        }
        .main-content p {
            margin-bottom: 1.2rem;
            font-size: 1.02rem;
            color: #1e293b;
        }
        .main-content p strong {
            color: #0f2b44;
        }
        .main-content ul,
        .main-content ol {
            margin: 0.8rem 0 1.2rem 1.8rem;
        }
        .main-content li {
            margin-bottom: 0.5rem;
        }
        .main-content .highlight-box {
            background: #f0f7ff;
            border-left: 4px solid #1d4ed8;
            padding: 1.2rem 1.5rem;
            border-radius: 0 12px 12px 0;
            margin: 1.5rem 0;
        }
        .main-content .highlight-box.warn {
            background: #fff9e6;
            border-left-color: #facc15;
        }
        .main-content .highlight-box.tip {
            background: #e6f7e6;
            border-left-color: #16a34a;
        }
        .main-content .stat-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            font-size: 0.95rem;
        }
        .main-content .stat-table th {
            background: #0f2b44;
            color: #fff;
            padding: 0.7rem 1rem;
            text-align: left;
        }
        .main-content .stat-table td {
            padding: 0.6rem 1rem;
            border-bottom: 1px solid #e2e8f0;
        }
        .main-content .stat-table tr:nth-child(even) td {
            background: #f8fafc;
        }
        .main-content .image-wrapper {
            margin: 2rem 0;
            border-radius: 14px;
            overflow: hidden;
            background: #f1f5f9;
            padding: 0.5rem;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
        }
        .main-content .image-wrapper figcaption {
            font-size: 0.85rem;
            color: #64748b;
            text-align: center;
            padding: 0.6rem 0 0.2rem 0;
            font-style: italic;
        }
        .sidebar-card {
            background: #fff;
            border-radius: 16px;
            padding: 1.5rem;
            margin-bottom: 1.5rem;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
            border: 1px solid #eef2f6;
        }
        .sidebar-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 1rem;
            color: #0f2b44;
            border-bottom: 2px solid #facc15;
            padding-bottom: 0.5rem;
        }
        .sidebar-card ul {
            list-style: none;
            padding: 0;
        }
        .sidebar-card ul li {
            padding: 0.4rem 0;
            border-bottom: 1px solid #f1f5f9;
        }
        .sidebar-card ul li:last-child {
            border-bottom: none;
        }
        .sidebar-card ul li a {
            font-size: 0.92rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .sidebar-card ul li a i {
            color: #facc15;
            font-size: 0.75rem;
        }
        .interactive-section {
            background: #fff;
            border-radius: 20px;
            padding: 2rem 2.2rem;
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
            margin: 2.5rem 0;
        }
        .interactive-section h2 {
            font-size: 1.6rem;
            font-weight: 700;
            color: #0f2b44;
            margin-bottom: 1.2rem;
            border-left: 5px solid #facc15;
            padding-left: 1rem;
        }
        .form-group {
            margin-bottom: 1.2rem;
        }
        .form-group label {
            display: block;
            font-weight: 600;
            margin-bottom: 0.3rem;
            color: #1e293b;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 0.7rem 1rem;
            border: 2px solid #e2e8f0;
            border-radius: 10px;
            font-size: 1rem;
            font-family: inherit;
            transition: border-color 0.2s;
            background: #fafcff;
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            border-color: #1d4ed8;
            outline: none;
            background: #fff;
        }
        .form-group textarea {
            min-height: 100px;
            resize: vertical;
        }
        .btn {
            background: #1d4ed8;
            color: #fff;
            border: none;
            padding: 0.7rem 1.8rem;
            border-radius: 10px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }
        .btn:hover {
            background: #0f3a9e;
            transform: translateY(-1px);
        }
        .btn:active {
            transform: scale(0.98);
        }
        .rating-stars {
            display: flex;
            gap: 0.3rem;
            font-size: 1.8rem;
            color: #d1d5db;
            cursor: pointer;
            direction: rtl;
        }
        .rating-stars i {
            transition: color 0.15s;
        }
        .rating-stars i:hover,
        .rating-stars i:hover~i {
            color: #facc15;
        }
        .rating-stars.active i.active-star {
            color: #facc15;
        }
        .footer-area {
            background: #0b1a2e;
            color: #cbd5e1;
            padding: 2.5rem 0 1.5rem;
            margin-top: 3rem;
            border-radius: 32px 32px 0 0;
        }
        .footer-area .container {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2rem;
        }
        .footer-area h4 {
            color: #facc15;
            font-size: 1.1rem;
            margin-bottom: 1rem;
            font-weight: 600;
        }
        .footer-area a {
            color: #94a3b8;
        }
        .footer-area a:hover {
            color: #facc15;
        }
        .footer-area .copyright {
            grid-column: 1 / -1;
            text-align: center;
            border-top: 1px solid #1e3a5f;
            padding-top: 1.5rem;
            margin-top: 1.5rem;
            font-size: 0.88rem;
            color: #64748b;
        }
        friend-link {
            display: block;
            margin: 0.4rem 0;
        }
        friend-link a {
            display: inline-block;
            padding: 0.25rem 0;
        }
        @media (max-width: 1024px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 1.2rem;
            }
            .sidebar .sidebar-card {
                margin-bottom: 0;
            }
        }
        @media (max-width: 768px) {
            .header-inner {
                flex-wrap: wrap;
            }
            .hamburger {
                display: block;
            }
            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                gap: 0.5rem;
                padding: 1rem 0 0.5rem 0;
                border-top: 1px solid rgba(255, 255, 255, 0.1);
                margin-top: 0.5rem;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 0.5rem 0;
                border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            }
            .hero h1 {
                font-size: 1.8rem;
            }
            .main-content {
                padding: 1.2rem 1rem;
            }
            .interactive-section {
                padding: 1.2rem 1rem;
            }
            .sidebar {
                grid-template-columns: 1fr;
            }
            .footer-area .container {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .breadcrumb .container {
                font-size: 0.75rem;
            }
            .main-content .stat-table {
                font-size: 0.8rem;
            }
            .main-content .stat-table th,
            .main-content .stat-table td {
                padding: 0.4rem 0.5rem;
            }
        }
        @media (max-width: 480px) {
            .my-logo {
                font-size: 1.2rem;
            }
            .my-logo i {
                font-size: 1.3rem;
            }
            .hero h1 {
                font-size: 1.5rem;
            }
            .hero p {
                font-size: 0.95rem;
            }
            .container {
                padding: 0 0.9rem;
            }
        }
        .scroll-top {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            background: #1d4ed8;
            color: #fff;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
            z-index: 99;
            transition: background 0.2s, transform 0.2s;
            border: none;
            cursor: pointer;
        }
        .scroll-top:hover {
            background: #0f3a9e;
            transform: translateY(-3px);
        }