*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        :root {
            --primary: #4a6cf7;
            --primary-dark: #3a56d4;
            --secondary: #ff6b6b;
            --accent: #ffd93d;
            --bg: #f8f9fe;
            --bg-card: #ffffff;
            --text: #1a1a2e;
            --text-light: #555577;
            --border: #e2e5f0;
            --shadow: 0 4px 20px rgba(74, 108, 247, 0.10);
            --radius: 16px;
            --radius-sm: 10px;
            --transition: 0.25s ease;
            --font: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
            --max-width: 1120px;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            padding: 0 20px;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            width: 100%;
        }
        header {
            background: var(--bg-card);
            border-bottom: 2px solid var(--border);
            padding: 0 0;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
            backdrop-filter: blur(6px);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 0;
            flex-wrap: wrap;
            gap: 10px;
        }
        .my-logo {
            font-size: 1.6rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary), #8b5cf6);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .my-logo i {
            -webkit-text-fill-color: var(--primary);
            font-size: 1.8rem;
        }
        .my-logo:hover {
            text-decoration: none;
            opacity: 0.9;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.6rem;
            color: var(--text);
            cursor: pointer;
            padding: 6px 10px;
            border-radius: 8px;
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: var(--border);
        }
        nav {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }
        nav a {
            padding: 8px 16px;
            border-radius: 50px;
            font-weight: 500;
            font-size: 0.92rem;
            color: var(--text-light);
            transition: all var(--transition);
            white-space: nowrap;
        }
        nav a:hover,
        nav a.active {
            background: var(--primary);
            color: #fff;
            text-decoration: none;
        }
        .breadcrumb {
            padding: 18px 0 4px 0;
            font-size: 0.85rem;
            color: var(--text-light);
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 6px;
        }
        .breadcrumb a {
            color: var(--text-light);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb span {
            color: var(--text);
            font-weight: 500;
        }
        .breadcrumb i {
            font-size: 0.6rem;
            color: #aaa;
        }
        main {
            flex: 1;
            padding: 24px 0 50px 0;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 32px;
        }
        .article-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 32px 36px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
        }
        h1 {
            font-size: 2.4rem;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 12px;
            color: var(--text);
            letter-spacing: -0.5px;
        }
        h1 i {
            color: var(--secondary);
            margin-right: 10px;
        }
        .last-updated {
            display: inline-block;
            font-size: 0.8rem;
            color: var(--text-light);
            background: var(--bg);
            padding: 4px 16px;
            border-radius: 50px;
            margin-bottom: 20px;
            border: 1px solid var(--border);
        }
        .last-updated i {
            margin-right: 6px;
        }
        h2 {
            font-size: 1.8rem;
            font-weight: 700;
            margin-top: 36px;
            margin-bottom: 16px;
            color: var(--text);
            border-bottom: 3px solid var(--accent);
            padding-bottom: 8px;
            display: inline-block;
        }
        h3 {
            font-size: 1.35rem;
            font-weight: 600;
            margin-top: 28px;
            margin-bottom: 10px;
            color: var(--primary-dark);
        }
        h4 {
            font-size: 1.1rem;
            font-weight: 600;
            margin-top: 20px;
            margin-bottom: 8px;
            color: var(--text);
        }
        p {
            margin-bottom: 18px;
            color: var(--text-light);
            font-size: 1.02rem;
        }
        p strong {
            color: var(--text);
            font-weight: 600;
        }
        ul,
        ol {
            margin: 12px 0 22px 24px;
            color: var(--text-light);
        }
        li {
            margin-bottom: 8px;
            line-height: 1.6;
        }
        .highlight-box {
            background: #f0f4ff;
            border-left: 5px solid var(--primary);
            padding: 18px 24px;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            margin: 24px 0;
        }
        .highlight-box p {
            margin-bottom: 0;
        }
        .feature-list {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
            list-style: none;
            margin-left: 0;
            padding: 0;
        }
        .feature-list li {
            background: var(--bg);
            padding: 12px 18px;
            border-radius: var(--radius-sm);
            border-left: 4px solid var(--primary);
            font-weight: 500;
        }
        .feature-list li i {
            color: var(--primary);
            margin-right: 10px;
        }
        .word-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
            gap: 10px;
            margin: 16px 0 24px 0;
            list-style: none;
            padding: 0;
        }
        .word-grid li {
            background: var(--bg);
            padding: 10px 16px;
            border-radius: var(--radius-sm);
            text-align: center;
            font-weight: 500;
            border: 1px solid var(--border);
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .word-grid li:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(74, 108, 247, 0.12);
        }
        .word-grid li i {
            color: var(--secondary);
            margin-right: 6px;
        }
        .btn {
            display: inline-block;
            padding: 10px 28px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            background: var(--primary);
            color: #fff;
        }
        .btn:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(74, 108, 247, 0.25);
            text-decoration: none;
        }
        .btn-secondary {
            background: var(--bg);
            color: var(--text);
            border: 2px solid var(--border);
        }
        .btn-secondary:hover {
            background: var(--border);
            color: var(--text);
        }
        .featured-image-wrapper {
            margin: 28px 0 32px 0;
            border-radius: var(--radius);
            overflow: hidden;
            background: var(--bg);
            text-align: center;
            padding: 16px;
            border: 1px solid var(--border);
        }
        .featured-image-wrapper img {
            border-radius: var(--radius-sm);
            width: 100%;
            max-height: 420px;
            object-fit: cover;
        }
        .featured-image-wrapper figcaption {
            margin-top: 10px;
            font-size: 0.85rem;
            color: var(--text-light);
            font-style: italic;
        }
        .search-section {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 28px 36px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            margin-top: 20px;
        }
        .search-form {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            margin-top: 10px;
        }
        .search-form input {
            flex: 1;
            min-width: 200px;
            padding: 14px 20px;
            border: 2px solid var(--border);
            border-radius: 50px;
            font-size: 1rem;
            outline: none;
            transition: border var(--transition);
            background: var(--bg);
            color: var(--text);
        }
        .search-form input:focus {
            border-color: var(--primary);
        }
        .search-form button {
            padding: 14px 32px;
        }
        .comment-section {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 28px 36px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            margin-top: 20px;
        }
        .comment-form textarea {
            width: 100%;
            padding: 14px 18px;
            border: 2px solid var(--border);
            border-radius: var(--radius-sm);
            font-size: 1rem;
            font-family: var(--font);
            resize: vertical;
            min-height: 110px;
            outline: none;
            transition: border var(--transition);
            background: var(--bg);
            color: var(--text);
        }
        .comment-form textarea:focus {
            border-color: var(--primary);
        }
        .comment-form .form-row {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
            margin-top: 12px;
        }
        .comment-form .form-row input {
            flex: 1;
            min-width: 180px;
            padding: 12px 18px;
            border: 2px solid var(--border);
            border-radius: 50px;
            font-size: 0.95rem;
            outline: none;
            transition: border var(--transition);
            background: var(--bg);
            color: var(--text);
        }
        .comment-form .form-row input:focus {
            border-color: var(--primary);
        }
        .score-section {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 28px 36px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            margin-top: 20px;
        }
        .score-stars {
            display: flex;
            gap: 6px;
            font-size: 2rem;
            cursor: pointer;
            margin: 10px 0 16px 0;
            direction: rtl;
        }
        .score-stars i {
            color: #ddd;
            transition: color var(--transition);
        }
        .score-stars i:hover,
        .score-stars i:hover~i {
            color: var(--accent);
        }
        .score-stars i.active {
            color: var(--accent);
        }
        friend-link {
            display: block;
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 28px 36px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            margin-top: 20px;
        }
        friend-link h3 {
            margin-top: 0;
        }
        friend-link ul {
            list-style: none;
            margin-left: 0;
            padding: 0;
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }
        friend-link ul li a {
            display: inline-block;
            padding: 8px 20px;
            background: var(--bg);
            border-radius: 50px;
            border: 1px solid var(--border);
            font-weight: 500;
            transition: all var(--transition);
        }
        friend-link ul li a:hover {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            text-decoration: none;
        }
        footer {
            background: var(--bg-card);
            border-top: 2px solid var(--border);
            padding: 28px 0 32px 0;
            margin-top: 30px;
            text-align: center;
        }
        footer p {
            font-size: 0.9rem;
            color: var(--text-light);
            margin-bottom: 0;
        }
        footer .copyright {
            font-weight: 500;
            color: var(--text);
        }
        @media (max-width: 820px) {
            body {
                padding: 0 14px;
            }
            .article-card,
            .search-section,
            .comment-section,
            .score-section,
            friend-link {
                padding: 20px 18px;
            }
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.45rem;
            }
            h3 {
                font-size: 1.2rem;
            }
            .feature-list {
                grid-template-columns: 1fr;
            }
            .nav-toggle {
                display: block;
            }
            nav {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: stretch;
                gap: 4px;
                padding: 12px 0 6px 0;
                border-top: 1px solid var(--border);
                margin-top: 10px;
            }
            nav.open {
                display: flex;
            }
            nav a {
                padding: 10px 16px;
                border-radius: var(--radius-sm);
            }
            .header-inner {
                padding: 10px 0;
            }
            .my-logo {
                font-size: 1.3rem;
            }
            .breadcrumb {
                font-size: 0.75rem;
                padding: 12px 0 2px 0;
            }
            .search-form {
                flex-direction: column;
            }
            .search-form button {
                width: 100%;
            }
            .word-grid {
                grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
            }
        }
        @media (max-width: 480px) {
            h1 {
                font-size: 1.5rem;
            }
            h2 {
                font-size: 1.25rem;
            }
            .article-card,
            .search-section,
            .comment-section,
            .score-section,
            friend-link {
                padding: 16px 14px;
            }
            .score-stars {
                font-size: 1.6rem;
            }
            .comment-form .form-row {
                flex-direction: column;
            }
            .comment-form .form-row input {
                min-width: auto;
            }
        }
        .fade-up {
            opacity: 0;
            transform: translateY(30px);
            animation: fadeUp 0.6s ease forwards;
        }
        @keyframes fadeUp {
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .fade-up:nth-child(1) {
            animation-delay: 0.05s;
        }
        .fade-up:nth-child(2) {
            animation-delay: 0.10s;
        }
        .fade-up:nth-child(3) {
            animation-delay: 0.15s;
        }
        .fade-up:nth-child(4) {
            animation-delay: 0.20s;
        }
        .fade-up:nth-child(5) {
            animation-delay: 0.25s;
        }
        .fade-up:nth-child(6) {
            animation-delay: 0.30s;
        }