* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary-color: #0645ad;
            --primary-hover: #0b0080;
            --accent-color: #0645ad;
            --secondary-color: #54595d;
            --bg-color: #ffffff;
            --card-bg: #ffffff;
            --text-primary: #202122;
            --text-secondary: #54595d;
            --border-color: #c8ccd1;
            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
            --shadow-md: 0 2px 4px 0 rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 4px 8px 0 rgba(0, 0, 0, 0.1);
            --radius: 0.5rem;
            --radius-lg: 0.75rem;
            --focus-ring: #0645ad;
            --focus-ring-offset: 2px;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-color);
            font-size: 16px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        header {
            background: var(--card-bg);
            padding: 1rem 0;
            margin-bottom: 2rem;
            position: sticky;
            top: 0;
            z-index: 100;
            border-bottom: 1px solid var(--border-color);
        }
        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 2rem;
        }
        nav a {
            color: var(--text-primary);
            text-decoration: none;
            font-weight: 500;
            transition: color 0.2s ease;
            padding: 0.5rem 0.25rem;
            min-height: 44px;
            display: inline-flex;
            align-items: center;
        }
        nav a:hover {
            color: var(--primary-color);
            text-decoration: underline;
        }
        .logo {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-color);
            text-decoration: none;
            min-height: 44px;
            display: inline-flex;
            align-items: center;
        }
        .nav-links {
            display: flex;
            gap: 1.5rem;
            align-items: center;
        }
        main {
            min-height: calc(100vh - 200px);
            padding: 2rem 0;
        }
        footer {
            background: var(--text-primary);
            color: #fff;
            text-align: center;
            padding: 2.5rem 0;
            margin-top: 4rem;
        }
        footer a {
            color: #fff;
            text-decoration: none;
        }
        footer a:hover {
            text-decoration: underline;
        }
        .breadcrumbs {
            background: var(--card-bg);
            padding: 1rem 1.5rem;
            margin-bottom: 1.5rem;
            border-radius: var(--radius);
            border: 1px solid var(--border-color);
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            flex-wrap: wrap;
        }
        .breadcrumbs a {
            color: var(--primary-color);
            text-decoration: none;
            transition: color 0.2s ease;
            font-weight: 500;
        }
        .breadcrumbs a:hover {
            color: var(--primary-hover);
            text-decoration: underline;
        }
        /* 仅分隔符左右留白；当前页等普通 span 不再加 margin，避免 / 与最后一项间距加倍 */
        .breadcrumbs__sep {
            margin: 0 0.5rem;
            color: var(--text-secondary);
            user-select: none;
        }
        .breadcrumbs > span:not(.breadcrumbs__sep) {
            margin: 0;
            color: var(--text-secondary);
            user-select: none;
        }
        /* 面包屑固定：用于文章详情、景点详情等长页，滚动时始终可见且不被顶栏或下方内容遮挡 */
        .breadcrumbs--sticky {
            position: sticky;
            top: 4rem;
            z-index: 90;
            background: var(--card-bg);
            box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.06);
            isolation: isolate;
        }
        @media (max-width: 768px) {
            .breadcrumbs--sticky {
                top: 4.5rem;
            }
        }
        .card {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            padding: 2rem;
            margin-bottom: 1.5rem;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: box-shadow 0.2s ease;
        }
        .card:hover {
            box-shadow: var(--shadow-md);
        }
        .card h1 {
            margin-bottom: 1rem;
            color: var(--text-primary);
            font-size: 2rem;
            font-weight: 700;
            line-height: 1.2;
        }
        .card h2 {
            margin-bottom: 1rem;
            color: var(--text-primary);
            font-size: 1.5rem;
            font-weight: 600;
            line-height: 1.3;
        }
        .card h3 {
            margin-bottom: 0.5rem;
            color: var(--text-primary);
            font-size: 1.25rem;
            font-weight: 600;
            line-height: 1.4;
        }
        .card p {
            color: var(--text-primary);
            line-height: 1.8;
            margin-bottom: 1.5rem;
        }
        .btn {
            display: inline-block;
            padding: 0.625rem 1.25rem;
            background: var(--primary-color);
            color: #fff;
            text-decoration: none;
            border-radius: var(--radius);
            transition: all 0.2s ease;
            font-weight: 500;
            border: none;
            cursor: pointer;
        }
        .btn:hover {
            background: var(--primary-hover);
        }
        .btn-secondary {
            display: inline-block;
            padding: 0.5rem 1rem;
            background: transparent;
            color: var(--primary-color);
            text-decoration: none;
            border-radius: var(--radius);
            transition: all 0.2s ease;
            font-weight: 500;
            border: 1px solid var(--primary-color);
            font-size: 0.875rem;
        }
        .btn-secondary:hover {
            background: var(--primary-color);
            color: #fff;
        }
        .btn-link {
            display: inline-block;
            color: var(--primary-color);
            text-decoration: none;
            font-size: 0.875rem;
            font-weight: 500;
            transition: color 0.2s ease;
            padding: 0.25rem 0;
        }
        .btn-link:hover {
            color: var(--primary-hover);
            text-decoration: underline;
        }
        .btn-link::after {
            content: ' →';
            transition: transform 0.2s ease;
            display: inline-block;
        }
        .btn-link:hover::after {
            transform: translateX(3px);
        }
        .list-item {
            padding: 1.25rem 0;
            border-bottom: 1px solid var(--border-color);
            transition: background-color 0.2s ease;
        }
        .list-item:last-child {
            border-bottom: none;
        }
        .list-item:hover {
            background-color: var(--bg-color);
            margin: 0 -2rem;
            padding-left: 2rem;
            padding-right: 2rem;
            border-radius: var(--radius);
        }
        .list-item a {
            color: var(--text-primary);
            text-decoration: none;
            display: block;
        }
        .list-item a:hover h3 {
            color: var(--primary-color);
            text-decoration: underline;
        }
        .tags {
            margin-top: 0.75rem;
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
        }
        .tag {
            display: inline-block;
            padding: 0.375rem 0.75rem;
            background: #f8f9fa;
            color: var(--text-primary);
            border-radius: 9999px;
            font-size: 0.875rem;
            font-weight: 500;
            border: 1px solid var(--border-color);
            transition: all 0.2s ease;
        }
        a:hover .tag {
            background: var(--primary-color);
            color: #fff;
            border-color: var(--primary-color);
        }
        .tag:hover {
            background: var(--primary-color);
            color: #fff;
            border-color: var(--primary-color);
        }
        .grid {
            display: grid;
            gap: 1.5rem;
        }
        .grid-2 {
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        }
        .grid-3 {
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        }
        .grid-4 {
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        }

        .skip-link {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }
        .skip-link:focus {
            position: fixed;
            left: 1rem;
            top: 1rem;
            width: auto;
            height: auto;
            padding: 0.75rem 1.25rem;
            margin: 0;
            overflow: visible;
            clip: auto;
            white-space: normal;
            z-index: 200;
            background: var(--card-bg);
            color: var(--primary-color);
            font-weight: 600;
            text-decoration: none;
            border-radius: var(--radius);
            box-shadow: var(--shadow-lg);
            border: 2px solid var(--focus-ring);
        }
        .skip-link:focus-visible {
            outline: none;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible,
        .btn:focus-visible,
        .btn-secondary:focus-visible,
        .btn-link:focus-visible {
            outline: 2px solid var(--focus-ring);
            outline-offset: var(--focus-ring-offset);
        }
        footer a:focus-visible {
            outline-color: #fff;
        }

        @media (prefers-reduced-motion: reduce) {
            *,
            *::before,
            *::after {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
            }
        }

        /* 响应式设计 */
        @media (max-width: 768px) {
            .container {
                padding: 0 1rem;
            }
            nav {
                flex-direction: row;
                flex-wrap: nowrap;
                gap: 1rem;
                align-items: center;
            }
            .nav-links {
                width: auto;
                justify-content: flex-end;
                flex-wrap: nowrap;
                gap: 1rem;
            }
            .nav-links form {
                width: 100%;
                margin-top: 0.5rem;
            }
            .nav-links form input {
                flex: 1;
                min-width: 0;
            }
            .card {
                padding: 1.5rem;
            }
            .card h1 {
                font-size: 1.75rem;
            }
            .card h2 {
                font-size: 1.25rem;
            }
            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
            }
            .list-item:hover {
                margin: 0 -1.5rem;
                padding-left: 1.5rem;
                padding-right: 1.5rem;
            }
        }

        @media (max-width: 480px) {
            .logo {
                font-size: 1.25rem;
            }
            nav {
                gap: 0.75rem;
            }
            .nav-links {
                gap: 0.75rem;
            }
            .card {
                padding: 1.25rem;
            }
            main {
                padding: 1rem 0;
            }
        }