*,
        *::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: #f4f7fb;
            color: #1e2a3a;
            line-height: 1.7;
            padding: 0;
            margin: 0;
        }
        a {
            color: #1a6bb0;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #0d3e6b;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        ul,
        ol {
            padding-left: 1.5rem;
            margin: 0.8rem 0;
        }
        li {
            margin-bottom: 0.4rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.2rem;
        }
        .site-header {
            background: linear-gradient(145deg, #0b1a2e, #132a44);
            padding: 0.8rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 0.8rem;
        }
        .my-logo {
            font-size: 1.9rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: #fff;
            text-shadow: 0 2px 8px rgba(0, 200, 255, 0.3);
            background: linear-gradient(135deg, #f5d76e, #ffb347);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            transition: transform 0.2s;
        }
        .my-logo:hover {
            transform: scale(1.02);
            text-decoration: none;
        }
        .my-logo span {
            font-weight: 300;
            font-size: 0.9rem;
            color: #8ab4d6;
            -webkit-text-fill-color: #8ab4d6;
        }
        .nav-toggle {
            display: none;
            background: transparent;
            border: 2px solid rgba(255, 255, 255, 0.3);
            color: #fff;
            font-size: 1.6rem;
            padding: 0.3rem 0.8rem;
            border-radius: 8px;
            cursor: pointer;
            transition: 0.2s;
        }
        .nav-toggle:hover {
            border-color: #f5d76e;
            color: #f5d76e;
        }
        .nav-menu {
            display: flex;
            gap: 0.2rem;
            flex-wrap: wrap;
            align-items: center;
        }
        .nav-menu a {
            color: #e0edf7;
            padding: 0.5rem 1rem;
            border-radius: 30px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: 0.2s;
            white-space: nowrap;
        }
        .nav-menu a:hover,
        .nav-menu a.active {
            background: rgba(255, 255, 255, 0.12);
            color: #f5d76e;
            text-decoration: none;
        }
        .nav-menu a i {
            margin-right: 0.4rem;
        }
        .breadcrumb {
            background: #eaf0f6;
            padding: 0.6rem 1.2rem;
            border-radius: 30px;
            display: inline-flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 0.3rem 0.6rem;
            font-size: 0.85rem;
            margin: 1.2rem 0 0.8rem;
        }
        .breadcrumb a {
            color: #1a6bb0;
        }
        .breadcrumb span {
            color: #5f7d9c;
        }
        .breadcrumb .sep {
            color: #a0b8cf;
            font-weight: 300;
        }
        .search-box {
            display: flex;
            max-width: 480px;
            margin: 1.5rem 0 0.5rem;
            border-radius: 50px;
            overflow: hidden;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
            background: #fff;
            border: 1px solid #dce6ef;
            transition: 0.2s;
        }
        .search-box:focus-within {
            border-color: #1a6bb0;
            box-shadow: 0 2px 20px rgba(26, 107, 176, 0.15);
        }
        .search-box input {
            flex: 1;
            border: none;
            padding: 0.8rem 1.2rem;
            font-size: 1rem;
            outline: none;
            background: transparent;
            color: #1e2a3a;
        }
        .search-box button {
            background: #1a6bb0;
            color: #fff;
            border: none;
            padding: 0.8rem 1.6rem;
            font-size: 1rem;
            cursor: pointer;
            transition: 0.2s;
            font-weight: 600;
        }
        .search-box button:hover {
            background: #0d4f8a;
        }
        .main-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
            margin: 2rem 0;
        }
        @media (min-width: 992px) {
            .main-grid {
                grid-template-columns: 2fr 1fr;
            }
        }
        .article-body {
            background: #fff;
            border-radius: 20px;
            padding: 2rem 1.8rem;
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
        }
        .sidebar {
            background: #fff;
            border-radius: 20px;
            padding: 1.8rem 1.5rem;
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
            height: fit-content;
            position: sticky;
            top: 100px;
        }
        h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.2;
            margin: 0.5rem 0 1rem;
            color: #0b1a2e;
            letter-spacing: -0.5px;
        }
        h2 {
            font-size: 1.9rem;
            font-weight: 700;
            margin: 2.2rem 0 1rem;
            color: #0b1a2e;
            border-left: 5px solid #f5d76e;
            padding-left: 1rem;
        }
        h3 {
            font-size: 1.4rem;
            font-weight: 600;
            margin: 1.8rem 0 0.8rem;
            color: #132a44;
        }
        h4 {
            font-size: 1.15rem;
            font-weight: 600;
            margin: 1.2rem 0 0.5rem;
            color: #1e3a5a;
        }
        p {
            margin: 0.8rem 0;
            color: #2c3e50;
        }
        .lead {
            font-size: 1.15rem;
            color: #2c4a6a;
            font-weight: 400;
        }
        .highlight {
            background: #fef9e7;
            padding: 0.1rem 0.4rem;
            border-radius: 4px;
            font-weight: 600;
        }
        .badge {
            display: inline-block;
            background: #eef3f9;
            padding: 0.2rem 0.8rem;
            border-radius: 30px;
            font-size: 0.8rem;
            color: #1a6bb0;
            font-weight: 500;
        }
        .table-wrap {
            overflow-x: auto;
            margin: 1.5rem 0;
            border-radius: 12px;
            border: 1px solid #e4ecf5;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.95rem;
        }
        th,
        td {
            padding: 0.8rem 1rem;
            text-align: left;
            border-bottom: 1px solid #e4ecf5;
        }
        th {
            background: #eaf1f9;
            font-weight: 600;
            color: #0b1a2e;
        }
        tr:last-child td {
            border-bottom: none;
        }
        tr:hover td {
            background: #f8fbfe;
        }
        .featured-img {
            margin: 1.8rem 0;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
        }
        .featured-img img {
            width: 100%;
            max-height: 400px;
            object-fit: cover;
        }
        .featured-img figcaption {
            background: #f4f8fc;
            padding: 0.6rem 1rem;
            font-size: 0.85rem;
            color: #4a6a8a;
            text-align: center;
        }
        .feedback-section {
            margin: 2.5rem 0;
            padding: 1.8rem;
            background: #f8fbfe;
            border-radius: 16px;
            border: 1px solid #e4ecf5;
        }
        .feedback-section h3 {
            margin-top: 0;
        }
        .form-group {
            margin-bottom: 1.2rem;
        }
        .form-group label {
            display: block;
            font-weight: 600;
            margin-bottom: 0.3rem;
            color: #1e3a5a;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 0.7rem 1rem;
            border: 1px solid #d0dce8;
            border-radius: 10px;
            font-size: 1rem;
            font-family: inherit;
            transition: 0.2s;
            background: #fff;
        }
        .form-group input:focus,
        .form-group textarea:focus {
            border-color: #1a6bb0;
            box-shadow: 0 0 0 3px rgba(26, 107, 176, 0.1);
            outline: none;
        }
        .form-group textarea {
            min-height: 100px;
            resize: vertical;
        }
        .btn {
            background: #1a6bb0;
            color: #fff;
            border: none;
            padding: 0.7rem 2rem;
            border-radius: 40px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: 0.2s;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }
        .btn:hover {
            background: #0d4f8a;
            transform: translateY(-1px);
            box-shadow: 0 4px 16px rgba(26, 107, 176, 0.25);
        }
        .btn-secondary {
            background: #e4ecf5;
            color: #1e3a5a;
        }
        .btn-secondary:hover {
            background: #d0dce8;
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 0.3rem;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            color: #d0d8e0;
            transition: 0.15s;
            cursor: pointer;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f5b342;
        }
        .sidebar-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .sidebar-links li {
            padding: 0.5rem 0;
            border-bottom: 1px solid #edf2f7;
            margin: 0;
        }
        .sidebar-links li:last-child {
            border-bottom: none;
        }
        .sidebar-links a {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            color: #1e3a5a;
            font-weight: 500;
        }
        .sidebar-links a i {
            color: #1a6bb0;
            width: 1.2rem;
        }
        .sidebar-links a:hover {
            color: #1a6bb0;
            text-decoration: none;
        }
        friend-link {
            display: block;
            background: #f0f5fc;
            padding: 1.2rem 1.5rem;
            border-radius: 16px;
            margin: 1.5rem 0 0.8rem;
            border: 1px solid #dce6ef;
        }
        friend-link a {
            display: inline-block;
            margin: 0.3rem 0.8rem 0.3rem 0;
            padding: 0.3rem 0.8rem;
            background: #fff;
            border-radius: 30px;
            font-size: 0.9rem;
            border: 1px solid #dce6ef;
            transition: 0.2s;
        }
        friend-link a:hover {
            background: #1a6bb0;
            color: #fff;
            border-color: #1a6bb0;
            text-decoration: none;
        }
        .site-footer {
            background: #0b1a2e;
            color: #b0c8dd;
            padding: 2rem 0;
            margin-top: 3rem;
            border-radius: 30px 30px 0 0;
        }
        .site-footer .container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
        }
        .site-footer a {
            color: #8ab4d6;
        }
        .site-footer a:hover {
            color: #f5d76e;
        }
        .copyright {
            font-size: 0.85rem;
            opacity: 0.8;
        }
        @media (max-width: 768px) {
            .nav-toggle {
                display: inline-block;
            }
            .nav-menu {
                display: none;
                width: 100%;
                flex-direction: column;
                background: rgba(11, 26, 46, 0.98);
                padding: 1rem 0;
                border-radius: 16px;
                margin-top: 0.5rem;
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-menu a {
                padding: 0.6rem 1.2rem;
                width: 100%;
                text-align: center;
            }
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            h3 {
                font-size: 1.2rem;
            }
            .article-body {
                padding: 1.2rem 1rem;
            }
            .sidebar {
                position: static;
                margin-top: 1.5rem;
            }
            .site-footer .container {
                flex-direction: column;
                text-align: center;
            }
            .breadcrumb {
                font-size: 0.75rem;
                padding: 0.4rem 0.8rem;
            }
            .my-logo {
                font-size: 1.5rem;
            }
            .header-inner {
                gap: 0.4rem;
            }
            .search-box {
                max-width: 100%;
            }
            .feedback-section {
                padding: 1rem;
            }
        }
        @media (min-width: 769px) {
            .nav-menu {
                display: flex !important;
            }
        }
        .mt-1 {
            margin-top: 1rem;
        }
        .mt-2 {
            margin-top: 2rem;
        }
        .mb-1 {
            margin-bottom: 1rem;
        }
        .flex-center {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            flex-wrap: wrap;
        }
        .text-small {
            font-size: 0.9rem;
            color: #5f7d9c;
        }
        .updated-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            background: #e6f0fa;
            padding: 0.3rem 1rem;
            border-radius: 30px;
            font-size: 0.8rem;
            color: #1a6bb0;
            font-weight: 500;
        }
        .emoji-big {
            font-size: 1.4rem;
        }
        hr {
            border: none;
            border-top: 2px solid #e4ecf5;
            margin: 2rem 0;
        }
        .card {
            background: #f8fbfe;
            border-radius: 14px;
            padding: 1.2rem 1.5rem;
            border-left: 4px solid #f5d76e;
            margin: 1.2rem 0;
        }
        .card.green {
            border-left-color: #27ae60;
        }
        .card.blue {
            border-left-color: #1a6bb0;
        }