* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary: #1a3a5c;
            --primary-light: #2c5f8a;
            --accent: #e8b830;
            --accent-hover: #d4a520;
            --bg: #f8f9fc;
            --card-bg: #ffffff;
            --text: #1e2a3a;
            --text-light: #4a5a6a;
            --border: #dce0e8;
            --radius: 12px;
            --shadow: 0 6px 24px rgba(0, 0, 0, 0.06);
            --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
            --max-width: 1200px;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: var(--accent-hover);
        }
        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(--primary);
            color: #fff;
            padding: 14px 0;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.12);
        }
        .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;
            letter-spacing: -0.5px;
            color: #fff;
            background: linear-gradient(135deg, var(--accent), #f5d94a);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            transition: opacity 0.25s;
        }
        .my-logo:hover {
            opacity: 0.85;
        }
        .my-logo i {
            -webkit-text-fill-color: initial;
            color: var(--accent);
            margin-right: 6px;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: 2px solid rgba(255, 255, 255, 0.3);
            color: #fff;
            font-size: 1.5rem;
            padding: 6px 14px;
            border-radius: 6px;
            cursor: pointer;
            transition: background 0.2s;
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .nav-menu {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            align-items: center;
        }
        .nav-menu a {
            color: rgba(255, 255, 255, 0.92);
            padding: 8px 16px;
            border-radius: 6px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: background 0.2s, color 0.2s;
        }
        .nav-menu a:hover {
            background: rgba(255, 255, 255, 0.12);
            color: var(--accent);
        }
        .nav-menu a.active {
            background: rgba(255, 255, 255, 0.15);
            color: var(--accent);
        }
        .breadcrumb {
            background: var(--card-bg);
            padding: 12px 0;
            border-bottom: 1px solid var(--border);
            font-size: 0.85rem;
        }
        .breadcrumb ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 6px 12px;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 10px;
            color: var(--text-light);
            font-weight: 600;
        }
        .breadcrumb a {
            color: var(--text-light);
        }
        .breadcrumb .current {
            color: var(--primary);
            font-weight: 600;
        }
        main {
            padding: 40px 0 60px;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        @media (max-width: 992px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
        }
        .article-body h1 {
            font-size: 2.4rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 10px;
            color: var(--primary);
        }
        .article-body h1 i {
            color: var(--accent);
            margin-right: 10px;
        }
        .meta-line {
            display: flex;
            flex-wrap: wrap;
            gap: 16px 28px;
            color: var(--text-light);
            font-size: 0.9rem;
            margin-bottom: 24px;
            padding-bottom: 16px;
            border-bottom: 1px solid var(--border);
        }
        .meta-line i {
            margin-right: 6px;
            color: var(--accent);
        }
        .article-body h2 {
            font-size: 1.8rem;
            font-weight: 700;
            margin: 48px 0 16px;
            padding-bottom: 8px;
            border-bottom: 3px solid var(--accent);
            color: var(--primary);
        }
        .article-body h2 i {
            color: var(--accent);
            margin-right: 10px;
        }
        .article-body h3 {
            font-size: 1.35rem;
            font-weight: 600;
            margin: 32px 0 12px;
            color: var(--primary-light);
        }
        .article-body h4 {
            font-size: 1.1rem;
            font-weight: 600;
            margin: 24px 0 10px;
            color: var(--text);
        }
        .article-body p {
            margin-bottom: 18px;
            color: var(--text);
        }
        .article-body ul,
        .article-body ol {
            margin: 12px 0 20px 24px;
        }
        .article-body li {
            margin-bottom: 8px;
        }
        .article-body strong {
            color: var(--primary);
            font-weight: 700;
        }
        .highlight-box {
            background: linear-gradient(135deg, #f0f6ff, #fff8e0);
            padding: 24px 28px;
            border-radius: var(--radius);
            border-left: 5px solid var(--accent);
            margin: 28px 0;
            box-shadow: var(--shadow);
        }
        .highlight-box i {
            color: var(--accent);
            margin-right: 8px;
        }
        .feature-img {
            margin: 32px 0 20px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        .feature-img figcaption {
            text-align: center;
            font-size: 0.85rem;
            color: var(--text-light);
            margin-top: 10px;
            font-style: italic;
        }
        .sidebar {
            position: sticky;
            top: 100px;
            align-self: start;
        }
        .sidebar-card {
            background: var(--card-bg);
            padding: 24px 20px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            margin-bottom: 28px;
        }
        .sidebar-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 14px;
            color: var(--primary);
            border-bottom: 2px solid var(--accent);
            padding-bottom: 8px;
        }
        .sidebar-card ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .sidebar-card li {
            margin-bottom: 10px;
        }
        .sidebar-card li a {
            font-size: 0.9rem;
            display: block;
            padding: 6px 0;
            border-bottom: 1px dashed var(--border);
        }
        .sidebar-card li a i {
            color: var(--accent);
            width: 20px;
            margin-right: 6px;
        }
        .search-form {
            display: flex;
            gap: 8px;
            margin: 16px 0 24px;
        }
        .search-form input {
            flex: 1;
            padding: 12px 18px;
            border: 2px solid var(--border);
            border-radius: 8px;
            font-size: 0.95rem;
            outline: none;
            transition: border 0.25s;
            background: #fff;
        }
        .search-form input:focus {
            border-color: var(--accent);
        }
        .search-form button {
            padding: 12px 24px;
            background: var(--accent);
            color: var(--primary);
            border: none;
            border-radius: 8px;
            font-weight: 700;
            font-size: 0.95rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.15s;
        }
        .search-form button:hover {
            background: var(--accent-hover);
            transform: scale(1.02);
        }
        .interaction-section {
            margin-top: 48px;
            padding-top: 32px;
            border-top: 2px solid var(--border);
        }
        .interaction-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }
        @media (max-width: 768px) {
            .interaction-grid {
                grid-template-columns: 1fr;
            }
        }
        .interaction-card {
            background: var(--card-bg);
            padding: 28px 24px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        .interaction-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 18px;
            color: var(--primary);
        }
        .interaction-card h3 i {
            color: var(--accent);
            margin-right: 8px;
        }
        .form-group {
            margin-bottom: 16px;
        }
        .form-group label {
            display: block;
            font-weight: 600;
            font-size: 0.9rem;
            margin-bottom: 4px;
            color: var(--text);
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 10px 14px;
            border: 2px solid var(--border);
            border-radius: 8px;
            font-size: 0.95rem;
            font-family: inherit;
            outline: none;
            transition: border 0.25s;
            background: #fff;
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            border-color: var(--accent);
        }
        .form-group textarea {
            min-height: 90px;
            resize: vertical;
        }
        .form-group .star-rating {
            display: flex;
            gap: 6px;
            font-size: 1.6rem;
            color: #ddd;
            cursor: pointer;
        }
        .form-group .star-rating i {
            transition: color 0.2s, transform 0.15s;
        }
        .form-group .star-rating i:hover,
        .form-group .star-rating i.active {
            color: var(--accent);
            transform: scale(1.1);
        }
        .btn-submit {
            padding: 12px 32px;
            background: var(--primary);
            color: #fff;
            border: none;
            border-radius: 8px;
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: background 0.25s, transform 0.15s;
        }
        .btn-submit:hover {
            background: var(--primary-light);
            transform: scale(1.02);
        }
        .site-footer {
            background: var(--primary);
            color: rgba(255, 255, 255, 0.9);
            padding: 40px 0 24px;
            margin-top: 40px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 28px;
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
        }
        .footer-brand h4 {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--accent);
            margin-bottom: 8px;
        }
        .footer-brand p {
            font-size: 0.9rem;
            opacity: 0.85;
            max-width: 360px;
        }
        .footer-links h5,
        .footer-friends h5 {
            font-weight: 600;
            font-size: 1rem;
            margin-bottom: 12px;
            color: var(--accent);
        }
        .footer-links ul,
        .footer-friends ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-links li,
        .footer-friends li {
            margin-bottom: 6px;
        }
        .footer-links a,
        .footer-friends a {
            color: rgba(255, 255, 255, 0.8);
            font-size: 0.88rem;
            transition: color 0.2s;
        }
        .footer-links a:hover,
        .footer-friends a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.15);
            padding-top: 20px;
            text-align: center;
            font-size: 0.85rem;
            opacity: 0.8;
        }
        .footer-bottom i {
            color: var(--accent);
        }
        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            .nav-menu {
                display: none;
                flex-direction: column;
                width: 100%;
                background: rgba(0, 0, 0, 0.2);
                padding: 12px 0;
                border-radius: 8px;
                margin-top: 8px;
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-menu a {
                padding: 10px 20px;
                width: 100%;
            }
            .header-inner {
                align-items: center;
            }
            .article-body h1 {
                font-size: 1.8rem;
            }
            .article-body h2 {
                font-size: 1.4rem;
            }
            .article-body h3 {
                font-size: 1.15rem;
            }
            .search-form {
                flex-direction: column;
            }
            .search-form button {
                width: 100%;
            }
            .meta-line {
                flex-direction: column;
                gap: 6px;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 14px;
            }
            .article-body h1 {
                font-size: 1.5rem;
            }
            .article-body h2 {
                font-size: 1.25rem;
            }
            .sidebar-card {
                padding: 16px;
            }
            .interaction-card {
                padding: 18px;
            }
        }
        .text-accent {
            color: var(--accent);
        }
        .fw-700 {
            font-weight: 700;
        }
        .mb-0 {
            margin-bottom: 0;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .gap-8 {
            gap: 8px;
        }
        friend-link {
            display: inline;
            font-weight: 500;
        }
        friend-link a {
            color: var(--accent);
            text-decoration: underline;
        }
        friend-link a:hover {
            color: #fff;
        }