*,
        *::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, BlinkMacSystemFont, sans-serif;
            line-height: 1.7;
            background: #f4f7fc;
            color: #1a2634;
            padding: 0;
            margin: 0;
        }
        a {
            color: #0d47a1;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #ff6d00;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        ul,
        ol {
            padding-left: 1.5rem;
            margin: 1rem 0;
        }
        li {
            margin-bottom: 0.4rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.2rem;
        }
        .section-title {
            font-size: 1.9rem;
            font-weight: 700;
            color: #0d47a1;
            border-left: 5px solid #ff6d00;
            padding-left: 1rem;
            margin: 2.5rem 0 1.5rem 0;
        }
        .section-subtitle {
            font-size: 1.4rem;
            font-weight: 600;
            color: #1a3a5c;
            margin: 2rem 0 1rem 0;
        }
        .section-subtitle-4 {
            font-size: 1.15rem;
            font-weight: 600;
            color: #2c3e50;
            margin: 1.5rem 0 0.8rem 0;
        }
        .text-muted {
            color: #5a6a7a;
            font-size: 0.95rem;
        }
        .highlight-box {
            background: #e8f0fe;
            border-left: 4px solid #0d47a1;
            padding: 1.2rem 1.5rem;
            border-radius: 0 8px 8px 0;
            margin: 1.5rem 0;
        }
        .emoji-lg {
            font-size: 1.4rem;
        }
        .btn {
            display: inline-block;
            background: #0d47a1;
            color: #fff;
            padding: 0.6rem 1.8rem;
            border-radius: 40px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: background 0.25s, transform 0.15s;
            font-size: 1rem;
        }
        .btn:hover {
            background: #ff6d00;
            transform: translateY(-2px);
            text-decoration: none;
            color: #fff;
        }
        .btn-outline {
            background: transparent;
            border: 2px solid #0d47a1;
            color: #0d47a1;
        }
        .btn-outline:hover {
            background: #0d47a1;
            color: #fff;
        }
        .site-header {
            background: linear-gradient(135deg, #0d1b2a 0%, #1a3a5c 100%);
            color: #fff;
            padding: 0.5rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding: 0.6rem 0;
        }
        .my-logo {
            font-size: 1.7rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: #fff;
            background: linear-gradient(135deg, #ff6d00, #ffab00);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .my-logo i {
            background: #ff6d00;
            -webkit-text-fill-color: #fff;
            background: #ff6d00;
            padding: 0.3rem 0.5rem;
            border-radius: 8px;
            font-size: 1.2rem;
        }
        .my-logo:hover {
            text-decoration: none;
            opacity: 0.9;
        }
        .my-logo span {
            font-size: 0.9rem;
            font-weight: 400;
            -webkit-text-fill-color: #aac4e0;
            letter-spacing: 0.2px;
            display: block;
            font-size: 0.7rem;
            margin-top: -4px;
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 1.8rem;
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .nav-menu li a {
            color: #d0e0f0;
            font-weight: 500;
            font-size: 0.95rem;
            padding: 0.3rem 0;
            border-bottom: 2px solid transparent;
            transition: border-color 0.2s, color 0.2s;
            display: flex;
            align-items: center;
            gap: 0.3rem;
        }
        .nav-menu li a:hover {
            color: #ffab00;
            border-bottom-color: #ffab00;
            text-decoration: none;
        }
        .nav-menu li a i {
            font-size: 0.85rem;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 6px 4px;
            border-radius: 4px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .hamburger span {
            display: block;
            width: 28px;
            height: 3px;
            background: #fff;
            border-radius: 4px;
            transition: all 0.3s;
        }
        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 6px);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -6px);
        }
        .breadcrumb {
            background: #e8edf4;
            padding: 0.7rem 0;
            font-size: 0.9rem;
            border-bottom: 1px solid #dce3ec;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            padding: 0;
            margin: 0;
            gap: 0.3rem 0.6rem;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 0.6rem;
            color: #8a9baa;
            font-weight: 600;
        }
        .breadcrumb a {
            color: #0d47a1;
        }
        .breadcrumb .current {
            color: #5a6a7a;
            font-weight: 500;
        }
        .hero {
            background: linear-gradient(145deg, #0d1b2a 0%, #1a3a5c 100%);
            color: #fff;
            padding: 3.5rem 0 3rem 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .hero::after {
            content: "🎯";
            position: absolute;
            right: 5%;
            bottom: -20px;
            font-size: 8rem;
            opacity: 0.06;
            pointer-events: none;
        }
        .hero h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 1rem;
            letter-spacing: -0.5px;
        }
        .hero h1 span {
            background: linear-gradient(135deg, #ffab00, #ff6d00);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: 1.15rem;
            max-width: 720px;
            margin: 0 auto 1.8rem auto;
            opacity: 0.9;
            color: #c8d8e8;
        }
        .hero .btn-group {
            display: flex;
            gap: 1rem;
            justify-content: center;
            flex-wrap: wrap;
        }
        .main-content {
            background: #fff;
            padding: 2.5rem 0 3rem 0;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 2.5rem;
        }
        .content-body p {
            margin-bottom: 1.2rem;
            color: #2a3747;
        }
        .content-body h2 {
            font-size: 1.9rem;
            font-weight: 700;
            color: #0d47a1;
            border-left: 5px solid #ff6d00;
            padding-left: 1rem;
            margin: 2.8rem 0 1.2rem 0;
        }
        .content-body h3 {
            font-size: 1.4rem;
            font-weight: 600;
            color: #1a3a5c;
            margin: 2rem 0 0.8rem 0;
        }
        .content-body h4 {
            font-size: 1.15rem;
            font-weight: 600;
            color: #2c3e50;
            margin: 1.5rem 0 0.5rem 0;
        }
        .sidebar {
            position: sticky;
            top: 90px;
            align-self: start;
        }
        .sidebar-card {
            background: #f4f7fc;
            border-radius: 12px;
            padding: 1.5rem;
            margin-bottom: 1.8rem;
            border: 1px solid #e0e8f0;
        }
        .sidebar-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: #0d47a1;
            margin-bottom: 1rem;
            border-bottom: 2px solid #dce3ec;
            padding-bottom: 0.6rem;
        }
        .sidebar-link-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .sidebar-link-list li {
            padding: 0.5rem 0;
            border-bottom: 1px solid #e8edf4;
        }
        .sidebar-link-list li:last-child {
            border-bottom: none;
        }
        .sidebar-link-list a {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            font-weight: 500;
            color: #1a3a5c;
        }
        .sidebar-link-list a i {
            color: #ff6d00;
            font-size: 0.8rem;
        }
        .sidebar-link-list a:hover {
            color: #ff6d00;
            text-decoration: none;
        }
        .feature-img {
            border-radius: 12px;
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.08);
            margin: 1.8rem 0;
            width: 100%;
            background: #f0f4fa;
        }
        .feature-img figcaption {
            font-size: 0.85rem;
            color: #6a7a8a;
            text-align: center;
            padding: 0.6rem 0 0 0;
            font-style: italic;
        }
        .search-form {
            display: flex;
            gap: 0.6rem;
            margin: 1.2rem 0;
            flex-wrap: wrap;
        }
        .search-form input {
            flex: 1;
            min-width: 180px;
            padding: 0.7rem 1.2rem;
            border: 2px solid #dce3ec;
            border-radius: 40px;
            font-size: 1rem;
            outline: none;
            transition: border-color 0.25s;
            background: #fff;
        }
        .search-form input:focus {
            border-color: #0d47a1;
        }
        .search-form button {
            padding: 0.7rem 1.8rem;
            border-radius: 40px;
            background: #0d47a1;
            color: #fff;
            border: none;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.25s;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .search-form button:hover {
            background: #ff6d00;
        }
        .comment-section,
        .rating-section {
            background: #f8faff;
            border-radius: 16px;
            padding: 1.8rem 2rem;
            margin: 2.5rem 0;
            border: 1px solid #e0e8f0;
        }
        .comment-section h3,
        .rating-section h3 {
            font-size: 1.4rem;
            font-weight: 700;
            color: #0d47a1;
            margin-bottom: 1.2rem;
            display: flex;
            align-items: center;
            gap: 0.7rem;
        }
        .form-group {
            margin-bottom: 1rem;
        }
        .form-group label {
            display: block;
            font-weight: 600;
            margin-bottom: 0.3rem;
            color: #1a3a5c;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 0.7rem 1rem;
            border: 2px solid #dce3ec;
            border-radius: 8px;
            font-size: 1rem;
            font-family: inherit;
            transition: border-color 0.25s;
            background: #fff;
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            border-color: #0d47a1;
            outline: none;
        }
        .form-group textarea {
            min-height: 100px;
            resize: vertical;
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 0.2rem;
            font-size: 1.8rem;
            margin: 0.5rem 0 1rem 0;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            cursor: pointer;
            color: #d0d8e0;
            transition: color 0.15s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #ffab00;
        }
        .site-footer {
            background: #0d1b2a;
            color: #b0c4d8;
            padding: 2.5rem 0 1.5rem 0;
            margin-top: 2rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2rem;
        }
        .site-footer h4 {
            color: #fff;
            font-size: 1.1rem;
            margin-bottom: 1rem;
            font-weight: 600;
        }
        .site-footer a {
            color: #90b0d0;
        }
        .site-footer a:hover {
            color: #ffab00;
        }
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links li {
            padding: 0.3rem 0;
        }
        .footer-links a {
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .friend-link {
            display: block;
            margin: 0.6rem 0;
            padding: 0.4rem 0;
            border-bottom: 1px solid #1a3a5c;
        }
        .friend-link a {
            color: #90b0d0;
            font-weight: 500;
        }
        .friend-link a:hover {
            color: #ffab00;
        }
        .copyright {
            border-top: 1px solid #1a3a5c;
            padding-top: 1.5rem;
            margin-top: 2rem;
            text-align: center;
            font-size: 0.9rem;
            color: #7a8a9a;
        }
        @media(max-width:992px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .hero h1 {
                font-size: 2rem;
            }
        }
        @media(max-width:768px) {
            .nav-menu {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #0d1b2a;
                padding: 1rem 0 1.5rem 0;
                gap: 0.2rem;
                border-top: 1px solid #1a3a5c;
                margin-top: 0.8rem;
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-menu li a {
                padding: 0.7rem 1rem;
                border-bottom: none;
                font-size: 1.05rem;
                border-left: 3px solid transparent;
            }
            .nav-menu li a:hover {
                border-left-color: #ffab00;
                border-bottom: none;
            }
            .hamburger {
                display: flex;
            }
            .hero h1 {
                font-size: 1.7rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .comment-section,
            .rating-section {
                padding: 1.2rem 1.2rem;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .content-body h2 {
                font-size: 1.5rem;
            }
            .content-body h3 {
                font-size: 1.2rem;
            }
            .my-logo {
                font-size: 1.3rem;
            }
            .breadcrumb ol {
                font-size: 0.8rem;
            }
        }
        @media(max-width:480px) {
            .hero h1 {
                font-size: 1.4rem;
            }
            .container {
                padding: 0 0.9rem;
            }
            .search-form input {
                min-width: 120px;
                font-size: 0.9rem;
            }
            .btn {
                font-size: 0.9rem;
                padding: 0.5rem 1.2rem;
            }
            .star-rating {
                font-size: 1.4rem;
            }
        }
        @media print {
            .site-header {
                position: static;
                background: #fff;
                color: #000;
            }
            .site-header .my-logo {
                -webkit-text-fill-color: #0d47a1;
            }
            .nav-menu,
            .hamburger,
            .search-form,
            .comment-section .btn,
            .rating-section .btn {
                display: none !important;
            }
            .sidebar {
                position: static;
            }
            .hero {
                padding: 1rem 0;
                background: #f4f7fc;
                color: #000;
            }
            .hero h1 span {
                -webkit-text-fill-color: #0d47a1;
            }
            .site-footer {
                background: #f4f7fc;
                color: #000;
            }
            .site-footer a {
                color: #0d47a1;
            }
            .breadcrumb {
                background: #f4f7fc;
            }
        }