* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
            background: #f4f7fc;
            color: #1a2634;
            line-height: 1.7;
            font-size: 16px;
            scroll-behavior: smooth;
        }
        a {
            color: #0066cc;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #004499;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(145deg, #0b1a2e, #1a2f44);
            color: #fff;
            padding: 18px 0;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 1.9rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #a0d4ff, #6ab0ff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            transition: transform 0.2s;
            display: inline-block;
        }
        .my-logo:hover {
            transform: scale(1.02);
            text-decoration: none;
        }
        .my-logo i {
            -webkit-text-fill-color: #6ab0ff;
            margin-right: 6px;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: 2px solid rgba(255, 255, 255, 0.3);
            color: #fff;
            font-size: 1.6rem;
            padding: 6px 14px;
            border-radius: 8px;
            cursor: pointer;
            transition: background 0.2s;
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        nav {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            align-items: center;
        }
        nav a {
            color: #e0edff;
            padding: 8px 16px;
            border-radius: 8px;
            font-weight: 500;
            font-size: 0.95rem;
            transition: background 0.2s, color 0.2s;
            white-space: nowrap;
        }
        nav a:hover {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            text-decoration: none;
        }
        nav a i {
            margin-right: 6px;
        }
        .breadcrumb {
            background: #e9eef3;
            padding: 12px 0;
            font-size: 0.9rem;
            border-bottom: 1px solid #d4dce6;
        }
        .breadcrumb ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 6px 12px;
            align-items: center;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 10px;
            color: #7a8a9e;
            font-weight: 600;
        }
        .breadcrumb a {
            color: #2c5f8a;
        }
        .breadcrumb .current {
            color: #1a2634;
            font-weight: 600;
        }
        main {
            padding: 40px 0 60px;
        }
        h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 16px;
            color: #0b1a2e;
            letter-spacing: -0.5px;
        }
        h2 {
            font-size: 1.9rem;
            font-weight: 700;
            margin-top: 48px;
            margin-bottom: 16px;
            color: #0b1a2e;
            border-left: 6px solid #3b82f6;
            padding-left: 18px;
        }
        h3 {
            font-size: 1.4rem;
            font-weight: 600;
            margin-top: 32px;
            margin-bottom: 12px;
            color: #1a2f44;
        }
        h4 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-top: 24px;
            margin-bottom: 8px;
            color: #2c3e5a;
        }
        p {
            margin-bottom: 18px;
            font-size: 1.05rem;
        }
        .lead {
            font-size: 1.2rem;
            color: #2c3e5a;
            font-weight: 400;
            border-left: 4px solid #6ab0ff;
            padding-left: 20px;
            margin-bottom: 28px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 16px 30px;
            align-items: center;
            padding: 14px 0 20px;
            color: #4a5a6e;
            font-size: 0.95rem;
            border-bottom: 1px solid #dce3ec;
            margin-bottom: 30px;
        }
        .article-meta i {
            margin-right: 6px;
            color: #3b82f6;
        }
        .feature-image {
            margin: 30px 0 40px;
            border-radius: 16px;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
        }
        .feature-image figcaption {
            text-align: center;
            font-size: 0.9rem;
            color: #5a6a7e;
            margin-top: 10px;
            font-style: italic;
        }
        .highlight-box {
            background: #e8f0fe;
            border-radius: 14px;
            padding: 24px 28px;
            margin: 30px 0;
            border-left: 6px solid #3b82f6;
        }
        .highlight-box strong {
            color: #0b1a2e;
        }
        ul,
        ol {
            margin: 16px 0 24px 24px;
        }
        li {
            margin-bottom: 8px;
            font-size: 1.02rem;
        }
        .link-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px 18px;
            list-style: none;
            margin: 16px 0 24px 0;
            padding: 0;
        }
        .link-list li a {
            background: #eef3f9;
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 0.95rem;
            display: inline-block;
            transition: background 0.2s, transform 0.15s;
        }
        .link-list li a:hover {
            background: #dce6f2;
            transform: translateY(-1px);
            text-decoration: none;
        }
        .link-list li a i {
            margin-right: 5px;
            color: #3b82f6;
        }
        .interactive-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin: 50px 0 40px;
        }
        .card {
            background: #fff;
            border-radius: 18px;
            padding: 28px 30px;
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
            border: 1px solid #e6edf5;
            transition: box-shadow 0.25s;
        }
        .card:hover {
            box-shadow: 0 10px 36px rgba(0, 0, 0, 0.06);
        }
        .card h3 {
            margin-top: 0;
            font-size: 1.5rem;
            border-left: 4px solid #3b82f6;
            padding-left: 14px;
        }
        .card input,
        .card textarea,
        .card select {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid #d4dce6;
            border-radius: 10px;
            font-size: 1rem;
            font-family: inherit;
            transition: border 0.2s;
            background: #fafcff;
        }
        .card input:focus,
        .card textarea:focus,
        .card select:focus {
            outline: none;
            border-color: #3b82f6;
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.12);
        }
        .card textarea {
            min-height: 100px;
            resize: vertical;
        }
        .card .btn {
            background: #1a2f44;
            color: #fff;
            border: none;
            padding: 12px 28px;
            border-radius: 10px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            margin-top: 8px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .card .btn:hover {
            background: #0b1a2e;
            transform: translateY(-1px);
        }
        .card .btn i {
            font-size: 1.1rem;
        }
        .score-stars {
            display: flex;
            gap: 8px;
            font-size: 1.8rem;
            color: #d4dce6;
            cursor: pointer;
            margin: 10px 0 16px;
            flex-wrap: wrap;
        }
        .score-stars .star {
            transition: color 0.15s, transform 0.1s;
        }
        .score-stars .star:hover,
        .score-stars .star.active {
            color: #f5b342;
            transform: scale(1.1);
        }
        .comment-list {
            margin-top: 18px;
            border-top: 1px solid #e6edf5;
            padding-top: 16px;
            max-height: 200px;
            overflow-y: auto;
        }
        .comment-item {
            padding: 10px 0;
            border-bottom: 1px solid #edf2f8;
            font-size: 0.95rem;
        }
        .comment-item strong {
            color: #0b1a2e;
        }
        .comment-item .date {
            color: #7a8a9e;
            font-size: 0.8rem;
            margin-left: 12px;
        }
        footer {
            background: #0b1a2e;
            color: #c8d6e6;
            padding: 40px 0 20px;
            margin-top: 40px;
        }
        footer a {
            color: #8bb8f0;
        }
        footer a:hover {
            color: #b0d4ff;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 30px;
        }
        .footer-grid h4 {
            color: #e0edff;
            margin-top: 0;
            font-size: 1.15rem;
            border-left: 3px solid #3b82f6;
            padding-left: 12px;
        }
        friend-link {
            display: block;
            background: rgba(255, 255, 255, 0.04);
            border-radius: 12px;
            padding: 16px 20px;
            margin-top: 8px;
        }
        friend-link a {
            display: inline-block;
            margin: 4px 12px 4px 0;
            padding: 4px 0;
        }
        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 22px;
            text-align: center;
            font-size: 0.9rem;
            color: #8a9eb0;
        }
        .copyright span {
            color: #b0c8e0;
        }
        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            nav {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: stretch;
                padding-top: 16px;
                gap: 6px;
            }
            nav.open {
                display: flex;
            }
            nav a {
                padding: 12px 16px;
                border-radius: 8px;
                background: rgba(255, 255, 255, 0.05);
            }
            h1 {
                font-size: 1.9rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            .interactive-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .header-inner {
                gap: 10px;
            }
            .breadcrumb ol {
                font-size: 0.8rem;
            }
            .container {
                padding: 0 14px;
            }
            .card {
                padding: 20px;
            }
            .lead {
                font-size: 1.05rem;
            }
        }
        @media (min-width: 769px) and (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        .text-center {
            text-align: center;
        }
        .mt-20 {
            margin-top: 20px;
        }
        .mb-20 {
            margin-bottom: 20px;
        }
        .flex-wrap {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .badge {
            display: inline-block;
            background: #dce6f2;
            padding: 2px 14px;
            border-radius: 30px;
            font-size: 0.8rem;
            font-weight: 600;
            color: #1a2f44;
        }
        hr {
            border: none;
            border-top: 2px solid #e6edf5;
            margin: 40px 0;
        }