*,
        *::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;
            background: #f5f7fc;
            color: #1a1a2e;
            line-height: 1.7;
            padding: 0 1rem;
        }
        a {
            color: #0066cc;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: #004499;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        h1,
        h2,
        h3,
        h4 {
            font-weight: 700;
            line-height: 1.25;
            color: #0b0b1a;
        }
        h1 {
            font-size: 2.4rem;
            margin: 0 0 0.75rem;
        }
        h2 {
            font-size: 1.8rem;
            margin: 2.5rem 0 1rem;
            border-bottom: 3px solid #e0e7ff;
            padding-bottom: 0.5rem;
        }
        h3 {
            font-size: 1.35rem;
            margin: 1.8rem 0 0.75rem;
        }
        h4 {
            font-size: 1.1rem;
            margin: 1.2rem 0 0.5rem;
        }
        p {
            margin-bottom: 1.2rem;
        }
        ul,
        ol {
            margin: 0 0 1.5rem 1.5rem;
        }
        li {
            margin-bottom: 0.4rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: #ffffff;
            border-radius: 24px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.06);
            padding: 0 1.5rem 2rem;
        }
        .site-header {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 1.2rem 0;
            border-bottom: 1px solid #e8ecf4;
            position: relative;
        }
        .my-logo {
            font-size: 1.9rem;
            font-weight: 800;
            background: linear-gradient(135deg, #0a1628, #1a3a6b);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.5px;
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
        }
        .my-logo i {
            -webkit-text-fill-color: #1a3a6b;
            font-size: 1.6rem;
        }
        .my-logo:hover {
            opacity: 0.85;
            text-decoration: none;
        }
        .nav-toggle {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: #1a1a2e;
            cursor: pointer;
            padding: 0.25rem 0.5rem;
            border-radius: 8px;
            transition: background 0.2s;
        }
        .nav-toggle:hover {
            background: #eef2f9;
        }
        .nav-toggle:focus-visible {
            outline: 2px solid #0066cc;
            outline-offset: 2px;
        }
        .primary-nav {
            display: flex;
            gap: 1.8rem;
            align-items: center;
            flex-wrap: wrap;
        }
        .primary-nav a {
            font-weight: 500;
            font-size: 0.95rem;
            color: #1a1a2e;
            padding: 0.3rem 0;
            border-bottom: 2px solid transparent;
            transition: border-color 0.2s, color 0.2s;
        }
        .primary-nav a:hover {
            border-bottom-color: #0066cc;
            color: #0066cc;
            text-decoration: none;
        }
        .primary-nav a.active {
            border-bottom-color: #0066cc;
            color: #0066cc;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            padding: 0.8rem 0 0.4rem;
            font-size: 0.85rem;
            color: #5a6a7a;
            border-bottom: 1px solid #f0f2f8;
            margin-bottom: 1.5rem;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin: 0 0.6rem;
            color: #aab2c0;
        }
        .breadcrumb a {
            color: #5a6a7a;
        }
        .breadcrumb a:hover {
            color: #0066cc;
        }
        .breadcrumb .current {
            color: #0b0b1a;
            font-weight: 500;
        }
        .search-section {
            background: #f0f4fe;
            border-radius: 18px;
            padding: 1.2rem 1.8rem;
            margin: 1.2rem 0 2rem;
            display: flex;
            flex-wrap: wrap;
            gap: 0.8rem;
            align-items: center;
        }
        .search-section label {
            font-weight: 600;
            font-size: 1rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .search-form {
            display: flex;
            flex: 1 1 280px;
            gap: 0.5rem;
        }
        .search-form input {
            flex: 1;
            padding: 0.7rem 1rem;
            border: 1px solid #d0d9e8;
            border-radius: 40px;
            font-size: 0.95rem;
            background: #fff;
            transition: border 0.25s, box-shadow 0.25s;
        }
        .search-form input:focus {
            border-color: #0066cc;
            box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.15);
            outline: none;
        }
        .search-form button {
            background: #1a3a6b;
            color: #fff;
            border: none;
            border-radius: 40px;
            padding: 0.7rem 1.5rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.25s, transform 0.1s;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .search-form button:hover {
            background: #0f2647;
        }
        .search-form button:active {
            transform: scale(0.97);
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            margin: 1.5rem 0 2rem;
        }
        .main-article {
            min-width: 0;
        }
        .sidebar {
            background: #f9faff;
            border-radius: 18px;
            padding: 1.6rem 1.4rem;
            border: 1px solid #e8ecf6;
            align-self: start;
            position: sticky;
            top: 1.5rem;
        }
        .sidebar h3 {
            font-size: 1.1rem;
            margin-top: 0;
            border-bottom: 2px solid #dce3f0;
            padding-bottom: 0.5rem;
        }
        .sidebar ul {
            list-style: none;
            margin-left: 0;
        }
        .sidebar li {
            padding: 0.35rem 0;
            border-bottom: 1px solid #edf0f8;
        }
        .sidebar li a {
            font-size: 0.92rem;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .sidebar li a i {
            width: 1rem;
            color: #1a3a6b;
        }
        .featured-img {
            margin: 1.8rem 0 2rem;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
        }
        .featured-img img {
            width: 100%;
            max-height: 460px;
            object-fit: cover;
        }
        .featured-img figcaption {
            font-size: 0.85rem;
            color: #5a6a7a;
            padding: 0.6rem 1rem;
            background: #f9faff;
            border-top: 1px solid #e8ecf6;
        }
        .data-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0 2rem;
            font-size: 0.95rem;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
        }
        .data-table th {
            background: #0b1a33;
            color: #fff;
            padding: 0.8rem 1rem;
            text-align: left;
            font-weight: 600;
        }
        .data-table td {
            padding: 0.75rem 1rem;
            border-bottom: 1px solid #e8ecf6;
            background: #fff;
        }
        .data-table tr:hover td {
            background: #f5f8ff;
        }
        .user-feedback {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.8rem;
            margin: 2.5rem 0 1.5rem;
            padding: 1.8rem;
            background: #f9faff;
            border-radius: 20px;
            border: 1px solid #e8ecf6;
        }
        .feedback-card {
            background: #fff;
            border-radius: 16px;
            padding: 1.4rem 1.6rem;
            box-shadow: 0 4px 14px rgba(0, 0, 0, 0.03);
        }
        .feedback-card h3 {
            margin-top: 0;
            font-size: 1.15rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .feedback-card form {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
            margin-top: 0.8rem;
        }
        .feedback-card input,
        .feedback-card textarea {
            padding: 0.65rem 1rem;
            border: 1px solid #d0d9e8;
            border-radius: 10px;
            font-size: 0.95rem;
            font-family: inherit;
            transition: border 0.2s;
        }
        .feedback-card input:focus,
        .feedback-card textarea:focus {
            border-color: #0066cc;
            outline: none;
            box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
        }
        .feedback-card textarea {
            resize: vertical;
            min-height: 80px;
        }
        .feedback-card button {
            background: #1a3a6b;
            color: #fff;
            border: none;
            border-radius: 40px;
            padding: 0.65rem 1.5rem;
            font-weight: 600;
            cursor: pointer;
            align-self: flex-start;
            transition: background 0.25s, transform 0.1s;
        }
        .feedback-card button:hover {
            background: #0f2647;
        }
        .feedback-card button:active {
            transform: scale(0.97);
        }
        .star-rating {
            display: flex;
            gap: 0.3rem;
            font-size: 1.6rem;
            color: #d4d9e4;
            cursor: pointer;
            direction: rtl;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            cursor: pointer;
            transition: color 0.15s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f5b342;
        }
        friend-link {
            display: block;
            padding: 1.2rem 0 0.5rem;
        }
        friend-link a {
            display: inline-block;
            margin: 0.25rem 0.8rem 0.25rem 0;
            padding: 0.3rem 0.9rem;
            background: #eef2f9;
            border-radius: 30px;
            font-size: 0.9rem;
            transition: background 0.2s, color 0.2s;
        }
        friend-link a:hover {
            background: #dce3f0;
            text-decoration: none;
        }
        .site-footer {
            border-top: 1px solid #e8ecf4;
            padding: 1.6rem 0 1rem;
            margin-top: 2.5rem;
            font-size: 0.9rem;
            color: #4a5a6a;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
        }
        .site-footer .copyright {
            font-size: 0.85rem;
        }
        .site-footer .copyright strong {
            color: #0b1a33;
        }
        @media (max-width: 820px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
                order: 2;
            }
            .user-feedback {
                grid-template-columns: 1fr;
            }
            h1 {
                font-size: 1.9rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            .site-header {
                padding: 0.8rem 0;
            }
            .nav-toggle {
                display: block;
            }
            .primary-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: flex-start;
                gap: 0.6rem;
                padding: 1rem 0 0.5rem;
                border-top: 1px solid #e8ecf4;
                margin-top: 0.6rem;
            }
            .primary-nav.open {
                display: flex;
            }
            .primary-nav a {
                font-size: 1rem;
                padding: 0.4rem 0;
            }
            .search-section {
                flex-direction: column;
                align-items: stretch;
                padding: 1rem 1.2rem;
            }
            .search-form {
                flex: 1 1 auto;
            }
            .data-table {
                font-size: 0.82rem;
            }
            .site-footer {
                flex-direction: column;
                gap: 0.5rem;
                text-align: center;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 0.8rem 1.2rem;
                border-radius: 16px;
            }
            h1 {
                font-size: 1.6rem;
            }
            h2 {
                font-size: 1.3rem;
            }
            .my-logo {
                font-size: 1.5rem;
            }
            .feedback-card {
                padding: 1rem;
            }
            .star-rating {
                font-size: 1.4rem;
            }
        }
        .highlight {
            background: #fcf2d9;
            padding: 0.1rem 0.3rem;
            border-radius: 4px;
            font-weight: 600;
        }
        .badge {
            display: inline-block;
            background: #1a3a6b;
            color: #fff;
            font-size: 0.7rem;
            padding: 0.15rem 0.6rem;
            border-radius: 30px;
            letter-spacing: 0.3px;
            font-weight: 600;
        }
        .emoji-big {
            font-size: 1.4rem;
        }
        .last-updated {
            font-size: 0.85rem;
            color: #5a6a7a;
            margin: 0.8rem 0 1.5rem;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .last-updated i {
            color: #1a3a6b;
        }
        .btn-back-top {
            position: fixed;
            bottom: 1.8rem;
            right: 1.8rem;
            background: #1a3a6b;
            color: #fff;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
            transition: background 0.25s, transform 0.2s;
            z-index: 99;
            border: none;
            cursor: pointer;
        }
        .btn-back-top:hover {
            background: #0f2647;
            transform: translateY(-3px);
        }
        @media (max-width: 480px) {
            .btn-back-top {
                bottom: 1rem;
                right: 1rem;
                width: 38px;
                height: 38px;
                font-size: 1rem;
            }
        }
        .schema-hidden {
            display: none;
        }
        .skip-link {
            position: absolute;
            top: -100px;
            left: 1rem;
            background: #1a3a6b;
            color: #fff;
            padding: 0.5rem 1.2rem;
            border-radius: 8px;
            z-index: 1000;
            font-weight: 600;
        }
        .skip-link:focus {
            top: 0.5rem;
        }