*, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            line-height: 1.7;
            background: #f5f7fa;
            color: #2d2d2d;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: #1a5c8c;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: #0e3e60;
            text-decoration: underline;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .header {
            background: linear-gradient(135deg, #0b2e4f 0%, #1a4a6e 50%, #234d6b 100%);
            color: white;
            padding: 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding: 15px 20px;
            max-width: 1200px;
            margin: 0 auto;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            text-decoration: none;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i {
            color: #f0a500;
            font-size: 2rem;
        }
        .my-logo:hover {
            text-decoration: none;
            opacity: 0.9;
        }
        .logo-sub {
            font-size: 0.7rem;
            font-weight: 400;
            display: block;
            color: #b0c4d8;
            letter-spacing: 1px;
            text-transform: uppercase;
            margin-top: -5px;
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 5px;
            list-style: none;
            flex-wrap: wrap;
        }
        .nav-menu li a {
            color: #dce8f0;
            font-size: 0.9rem;
            font-weight: 500;
            padding: 8px 14px;
            border-radius: 30px;
            transition: background 0.2s, color 0.2s;
        }
        .nav-menu li a:hover {
            background: rgba(255,255,255,0.15);
            color: #fff;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 5px 10px;
        }
        .breadcrumb-wrap {
            background: #eef2f5;
            border-bottom: 1px solid #dde2e6;
        }
        .breadcrumb {
            max-width: 1200px;
            margin: 0 auto;
            padding: 10px 20px;
            font-size: 0.85rem;
            color: #4a5a66;
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
        }
        .breadcrumb li + li::before {
            content: "›";
            margin-right: 6px;
            color: #8296a5;
        }
        .breadcrumb a {
            color: #1a5c8c;
        }
        .breadcrumb .current {
            font-weight: 600;
            color: #333;
        }
        .main {
            flex: 1;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            max-width: 1200px;
            margin: 30px auto;
            padding: 0 20px;
            width: 100%;
        }
        .content {
            background: white;
            border-radius: 12px;
            padding: 40px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.04);
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 25px;
        }
        .sidebar-widget {
            background: white;
            border-radius: 12px;
            padding: 25px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.04);
        }
        .sidebar-widget h3 {
            font-size: 1.1rem;
            margin-bottom: 15px;
            border-left: 4px solid #f0a500;
            padding-left: 12px;
            color: #1a3a52;
        }
        .sidebar-widget ul {
            list-style: none;
        }
        .sidebar-widget ul li {
            margin-bottom: 10px;
            padding-left: 18px;
            position: relative;
        }
        .sidebar-widget ul li i {
            position: absolute;
            left: 0;
            top: 4px;
            font-size: 0.8rem;
            color: #f0a500;
        }
        h1 {
            font-size: 2.4rem;
            line-height: 1.2;
            color: #0b2e4f;
            margin-bottom: 15px;
            font-weight: 800;
        }
        h2 {
            font-size: 1.8rem;
            color: #0b2e4f;
            margin: 45px 0 15px;
            padding-bottom: 8px;
            border-bottom: 2px solid #f0a500;
            font-weight: 700;
        }
        h3 {
            font-size: 1.3rem;
            color: #134b6e;
            margin: 30px 0 10px;
            font-weight: 600;
        }
        h4 {
            font-size: 1.1rem;
            color: #1a4a6e;
            margin: 20px 0 8px;
            font-weight: 600;
        }
        p {
            margin-bottom: 16px;
        }
        ul, ol {
            margin: 0 0 20px 25px;
        }
        li {
            margin-bottom: 8px;
        }
        .highlight-box {
            background: #f0f8ff;
            border-left: 5px solid #f0a500;
            padding: 20px 25px;
            border-radius: 0 8px 8px 0;
            margin: 25px 0;
        }
        .stats-row {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            margin: 25px 0;
        }
        .stat-card {
            flex: 1 1 160px;
            background: #f5f9fc;
            border-radius: 10px;
            padding: 20px;
            text-align: center;
            border: 1px solid #e0e8ee;
        }
        .stat-card i {
            font-size: 2rem;
            color: #f0a500;
            margin-bottom: 8px;
        }
        .stat-value {
            font-size: 1.6rem;
            font-weight: 700;
            color: #0b2e4f;
        }
        .stat-label {
            font-size: 0.85rem;
            color: #5a6a78;
        }
        .data-table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0 30px;
            font-size: 0.9rem;
        }
        .data-table th, .data-table td {
            padding: 12px 15px;
            border: 1px solid #e0e6ec;
            text-align: left;
        }
        .data-table th {
            background: #0b2e4f;
            color: white;
            font-weight: 600;
        }
        .data-table tr:nth-child(even) {
            background: #f8fafb;
        }
        .feedback-section {
            margin-top: 50px;
        }
        .feedback-form {
            background: #f8fafc;
            border-radius: 10px;
            padding: 25px;
            margin-bottom: 30px;
        }
        .feedback-form label {
            display: block;
            margin-bottom: 6px;
            font-weight: 600;
            font-size: 0.9rem;
        }
        .feedback-form input, .feedback-form textarea, .feedback-form select {
            width: 100%;
            padding: 10px 14px;
            border: 1px solid #ced8df;
            border-radius: 6px;
            font-family: inherit;
            margin-bottom: 15px;
            font-size: 0.9rem;
        }
        .feedback-form textarea {
            height: 100px;
            resize: vertical;
        }
        .btn {
            background: #f0a500;
            color: #0b2e4f;
            border: none;
            border-radius: 30px;
            padding: 10px 30px;
            font-weight: 700;
            cursor: pointer;
            font-size: 0.9rem;
            transition: background 0.2s, transform 0.1s;
        }
        .btn:hover {
            background: #d49100;
            transform: scale(1.02);
        }
        .star-rating {
            display: flex;
            gap: 5px;
            font-size: 1.8rem;
            color: #ccc;
            margin-bottom: 15px;
        }
        .star-rating i.active {
            color: #f0a500;
        }
        .footer {
            background: #0b2e4f;
            color: #a8bdd0;
            padding: 50px 0 20px;
            margin-top: 50px;
        }
        .footer-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
            margin-bottom: 40px;
        }
        .footer h4 {
            color: #fff;
            margin-bottom: 15px;
            font-size: 1.1rem;
        }
        .footer a {
            color: #a8bdd0;
        }
        .footer a:hover {
            color: #fff;
        }
        friend-link {
            display: block;
            background: rgba(255,255,255,0.06);
            padding: 20px 25px;
            border-radius: 8px;
            font-size: 0.9rem;
            line-height: 2;
            margin-top: 20px;
        }
        friend-link a {
            margin-right: 15px;
        }
        .copyright {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 20px;
            text-align: center;
            font-size: 0.82rem;
            color: #6b879a;
        }
        .copyright p {
            margin-bottom: 5px;
        }
        .toc {
            background: #f8fafc;
            border-radius: 8px;
            padding: 20px 25px;
            margin-bottom: 30px;
            border: 1px solid #e0e8ef;
        }
        .toc h3 {
            margin-top: 0;
            margin-bottom: 12px;
            font-size: 1rem;
            color: #0b2e4f;
        }
        .toc ul {
            list-style: none;
            margin: 0;
            padding: 0;
            columns: 2;
            column-gap: 20px;
        }
        .toc ul li {
            margin-bottom: 5px;
            font-size: 0.88rem;
        }
        .toc ul li a::before {
            content: "• ";
            color: #f0a500;
        }
        @media (max-width: 900px) {
            .toc ul {
                columns: 1;
            }
        }
        @media (max-width: 1024px) {
            .main {
                grid-template-columns: 1fr;
            }
            .sidebar {
                order: 2;
            }
        }
        @media (max-width: 768px) {
            .header-inner {
                flex-wrap: wrap;
            }
            .hamburger {
                display: block;
                order: 3;
            }
            .nav-menu {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: flex-start;
                padding: 10px 0 0;
                gap: 2px;
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-menu li {
                width: 100%;
            }
            .nav-menu li a {
                display: block;
                padding: 10px 10px;
                border-radius: 0;
                border-bottom: 1px solid rgba(255,255,255,0.1);
            }
            .content {
                padding: 25px 18px;
            }
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            h3 {
                font-size: 1.1rem;
            }
            .stats-row {
                flex-direction: column;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 25px;
            }
            .data-table {
                font-size: 0.75rem;
            }
            .data-table th, .data-table td {
                padding: 8px 6px;
            }
        }
        @media (max-width: 480px) {
            .container, .main, .footer-inner {
                padding-left: 12px;
                padding-right: 12px;
            }
            .content {
                padding: 20px 14px;
            }
        }