*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        :root {
            --primary: #1a2a3a;
            --accent: #f36f21;
            --accent2: #0077b6;
            --bg: #f8f6f2;
            --text: #1e1e1e;
            --text-light: #555;
            --white: #fff;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            --radius: 12px;
            --font: 'Segoe UI', 'Roboto', system-ui, -apple-system, sans-serif;
            --max-width: 1160px;
            --header-bg: linear-gradient(135deg, #0d1b2a 0%, #1b2a3a 100%);
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: var(--accent2);
            text-decoration: none;
            transition: color 0.25s;
        }
        a:hover {
            color: var(--accent);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius);
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: var(--header-bg);
            color: var(--white);
            padding: 16px 0;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 16px rgba(0, 0, 0, 0.2);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
        }
        .my-logo {
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--white);
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .my-logo i {
            color: var(--accent);
            font-size: 1.8rem;
        }
        .my-logo:hover {
            color: var(--accent);
        }
        .my-logo span {
            background: var(--accent);
            padding: 0 8px;
            border-radius: 6px;
            font-size: 0.7rem;
            color: #fff;
            margin-left: 4px;
        }
        .main-nav {
            display: flex;
            gap: 6px;
            flex-wrap: wrap;
            align-items: center;
        }
        .main-nav a {
            color: #ddd;
            padding: 8px 16px;
            border-radius: 30px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: all 0.25s;
            white-space: nowrap;
        }
        .main-nav a:hover,
        .main-nav a.active {
            background: var(--accent);
            color: #fff;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: var(--white);
            font-size: 1.8rem;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 6px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                background: rgba(13, 27, 42, 0.98);
                padding: 16px 12px;
                border-radius: var(--radius);
                margin-top: 8px;
                gap: 4px;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 12px 16px;
                border-radius: 8px;
                border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            }
            .my-logo {
                font-size: 1.3rem;
            }
        }
        .breadcrumb {
            background: var(--white);
            padding: 12px 0;
            border-bottom: 1px solid #eae7e2;
            font-size: 0.85rem;
            color: var(--text-light);
        }
        .breadcrumb ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 6px 12px;
        }
        .breadcrumb li+li::before {
            content: "›";
            color: #aaa;
            margin-right: 10px;
        }
        .breadcrumb a {
            color: var(--accent2);
        }
        .breadcrumb .current {
            color: var(--text-light);
            font-weight: 500;
        }
        .main-content {
            padding: 40px 0 60px;
        }
        .article-card {
            background: var(--white);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 40px 36px;
        }
        @media (max-width: 640px) {
            .article-card {
                padding: 24px 16px;
            }
        }
        h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 12px;
            color: var(--primary);
        }
        h1 i {
            color: var(--accent);
        }
        .subhead {
            font-size: 1.1rem;
            color: var(--text-light);
            margin-bottom: 24px;
            border-left: 4px solid var(--accent);
            padding-left: 18px;
        }
        .last-updated {
            display: inline-block;
            background: #f0ede8;
            padding: 6px 16px;
            border-radius: 30px;
            font-size: 0.85rem;
            color: var(--text-light);
            margin-bottom: 28px;
        }
        .last-updated i {
            margin-right: 6px;
            color: var(--accent);
        }
        h2 {
            font-size: 1.9rem;
            font-weight: 700;
            margin-top: 48px;
            margin-bottom: 16px;
            color: var(--primary);
            border-bottom: 3px solid var(--accent);
            padding-bottom: 8px;
            display: inline-block;
        }
        h3 {
            font-size: 1.4rem;
            font-weight: 600;
            margin-top: 32px;
            margin-bottom: 10px;
            color: #1a2a3a;
        }
        h4 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-top: 24px;
            margin-bottom: 6px;
            color: #2a3a4a;
        }
        p {
            margin-bottom: 18px;
            color: #2e2e2e;
        }
        .highlight-box {
            background: #fef7ee;
            border-left: 5px solid var(--accent);
            padding: 20px 24px;
            border-radius: 0 12px 12px 0;
            margin: 24px 0;
        }
        .highlight-box strong {
            color: var(--primary);
        }
        ul,
        ol {
            margin: 12px 0 20px 24px;
        }
        li {
            margin-bottom: 8px;
        }
        .featured-image {
            margin: 28px 0;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .featured-image img {
            width: 100%;
            max-height: 520px;
            object-fit: cover;
        }
        .featured-image figcaption {
            background: #f0ede8;
            padding: 10px 18px;
            font-size: 0.9rem;
            color: var(--text-light);
            font-style: italic;
        }
        .search-section {
            background: #eef4f8;
            border-radius: var(--radius);
            padding: 28px 32px;
            margin: 32px 0 24px;
        }
        .search-section form {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }
        .search-section input[type="text"] {
            flex: 1;
            min-width: 200px;
            padding: 14px 20px;
            border: 2px solid #d0d8e0;
            border-radius: 40px;
            font-size: 1rem;
            outline: none;
            transition: border 0.3s;
            background: var(--white);
        }
        .search-section input[type="text"]:focus {
            border-color: var(--accent);
        }
        .search-section button {
            background: var(--accent);
            color: #fff;
            border: none;
            padding: 14px 32px;
            border-radius: 40px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s, transform 0.15s;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .search-section button:hover {
            background: #d85c0f;
            transform: scale(1.02);
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
            margin: 40px 0 20px;
        }
        @media (max-width: 720px) {
            .feedback-grid {
                grid-template-columns: 1fr;
            }
        }
        .feedback-card {
            background: #f9f7f4;
            border-radius: var(--radius);
            padding: 28px 26px;
            border: 1px solid #eae7e2;
        }
        .feedback-card h3 {
            margin-top: 0;
            font-size: 1.3rem;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .feedback-card form {
            display: flex;
            flex-direction: column;
            gap: 14px;
            margin-top: 14px;
        }
        .feedback-card textarea,
        .feedback-card input[type="text"],
        .feedback-card input[type="number"] {
            padding: 12px 16px;
            border: 2px solid #d0d8e0;
            border-radius: 10px;
            font-size: 0.95rem;
            font-family: inherit;
            outline: none;
            transition: border 0.3s;
            background: var(--white);
        }
        .feedback-card textarea:focus,
        .feedback-card input:focus {
            border-color: var(--accent2);
        }
        .feedback-card textarea {
            min-height: 90px;
            resize: vertical;
        }
        .feedback-card .btn-submit {
            background: var(--accent2);
            color: #fff;
            border: none;
            padding: 12px 24px;
            border-radius: 30px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s, transform 0.15s;
            align-self: flex-start;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .feedback-card .btn-submit:hover {
            background: #005f8c;
            transform: scale(1.02);
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 4px;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 1.8rem;
            color: #ccc;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f5b342;
        }
        .site-footer {
            background: var(--header-bg);
            color: #ccc;
            padding: 40px 0 20px;
            margin-top: 40px;
        }
        .footer-inner {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 40px;
            margin-bottom: 28px;
        }
        @media (max-width: 640px) {
            .footer-inner {
                grid-template-columns: 1fr;
                gap: 24px;
            }
        }
        .footer-inner h4 {
            color: var(--white);
            font-size: 1.1rem;
            margin-bottom: 12px;
            border-bottom: 2px solid var(--accent);
            display: inline-block;
            padding-bottom: 4px;
        }
        .footer-links {
            list-style: none;
            margin: 0;
        }
        .footer-links li {
            margin-bottom: 8px;
        }
        .footer-links a {
            color: #bbb;
            font-size: 0.9rem;
        }
        .footer-links a:hover {
            color: var(--accent);
        }
        friend-link {
            display: block;
            background: rgba(255, 255, 255, 0.05);
            padding: 16px 20px;
            border-radius: 10px;
            margin-top: 8px;
            font-size: 0.9rem;
            border-left: 3px solid var(--accent);
        }
        friend-link a {
            color: #f0c8a0;
            display: inline-block;
            margin: 0 12px 4px 0;
        }
        friend-link a:hover {
            color: var(--accent);
        }
        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 20px;
            text-align: center;
            font-size: 0.85rem;
            color: #888;
        }
        .copyright strong {
            color: #ddd;
        }
        .back-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: var(--accent);
            color: #fff;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
            cursor: pointer;
            transition: all 0.3s;
            border: none;
            z-index: 50;
            opacity: 0;
            pointer-events: none;
        }
        .back-top.visible {
            opacity: 1;
            pointer-events: all;
        }
        .back-top:hover {
            background: #d85c0f;
            transform: translateY(-3px);
        }
        .tag {
            display: inline-block;
            background: var(--accent);
            color: #fff;
            padding: 2px 12px;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            margin-right: 4px;
        }
        .inline-icon {
            margin-right: 6px;
        }
        .stat-badge {
            background: #1a2a3a;
            color: #fff;
            padding: 2px 10px;
            border-radius: 6px;
            font-size: 0.8rem;
            font-weight: 600;
            display: inline-block;
        }
        @media (max-width: 480px) {
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            h3 {
                font-size: 1.15rem;
            }
            .article-card {
                padding: 16px 12px;
            }
        }
        .table-wrap {
            overflow-x: auto;
            margin: 20px 0;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.95rem;
        }
        table th {
            background: var(--primary);
            color: #fff;
            padding: 12px 16px;
            text-align: left;
        }
        table td {
            padding: 10px 16px;
            border-bottom: 1px solid #eae7e2;
        }
        table tr:hover td {
            background: #f5f3ef;
        }