/* ==========================================================================
           IPcece Design System - WordPress 适配极简专业风格
           ========================================================================== */
        
        /* 1. 变量声明 (CSS Variables) */
        :root {
            --color-primary: #2563EB;
            --color-primary-hover: #1D4ED8;
            --color-bg-main: #FFFFFF;
            --color-bg-sub: #F8FAFC;
            --color-bg-hover: #F1F5F9;
            --color-text-title: #0F172A;
            --color-text-body: #475569;
            --color-text-muted: #94A3B8;
            --color-border: #E2E8F0;
            --color-border-light: #EDF2F7;
            --color-success: #10B981;
            --color-warning: #F59E0B;
            --color-error: #EF4444;
            --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
            --lh-title: 1.3;
            --lh-body: 1.6;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* 2. 基础重置 (Reset & Base) */
        *, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            font-size: 16px;
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-stack);
            background-color: var(--color-bg-main);
            color: var(--color-text-body);
            line-height: var(--lh-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        .container {
            width: 100%;
            max-width: 1120px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }

        /* ==========================================================================
           3. 顶部导航 (Site Header)
           ========================================================================== */
        body .site-header {
            background-color: var(--color-bg-main);
            border-bottom: 1px solid var(--color-border);
            height: 64px;
            display: flex;
            align-items: center;
            position: relative !important;
            z-index: 100;
        }

        .header-wrapper {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
        }

        .site-logo {
            font-size: 20px;
            font-weight: 600;
            color: var(--color-text-title);
            text-decoration: none;
            letter-spacing: -0.02em;
            display: flex;
            align-items: center;
            gap: 8px;
            flex-shrink: 0;
        }



        .site-logo .logo-badge {
            font-size: 11px;
            font-weight: 500;
            color: var(--color-primary);
            background-color: rgba(37, 99, 235, 0.08);
            padding: 1px 6px;
            border-radius: 2px;
            letter-spacing: 0;
        }

        .site-nav {
            display: flex;
            gap: 2px;
            list-style: none;
            align-items: center;
            flex-wrap: wrap;
        }

        .site-nav>li>a {
            color: var(--color-text-body);
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
            padding: 6px 12px;
            border-radius: 4px;
            transition: color 0.15s ease, background 0.15s ease;
            white-space: nowrap;
            display: block;
        }

        .site-nav>li>a:hover,
        .site-nav>li>a.active {
            color: var(--color-primary);
            background-color: rgba(37, 99, 235, 0.06);
        }

        /* ===== 下拉菜单 (hover 触发 + 滑动动画) ===== */
        .dropdown {
            position: relative;
        }

        .dropdown-toggle {
            cursor: pointer;
        }

        .dropdown-toggle::after {
            content: " ▾";
            font-size: 10px;
            transition: transform var(--transition);
        }

        .dropdown:hover .dropdown-toggle::after {
            transform: rotate(180deg);
        }

        .dropdown-menu {
            display: block;
            position: absolute;
            top: 100%;
            left: 0;
            min-width: 190px;
            background-color: var(--color-bg-main);
            border: 1px solid var(--color-border);
            border-radius: 4px;
            padding: 12px 0 6px;
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
            z-index: 200;
            opacity: 0;
            visibility: hidden;
            transform: translateY(-6px);
            transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
            transition-delay: 0.1s;
            pointer-events: none;
        }

        .dropdown:hover .dropdown-menu {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
            pointer-events: auto;
            transition-delay: 0s;
        }

        .dropdown-menu li {
            list-style: none;
        }

        .dropdown-menu a {
            display: block;
            padding: 6px 16px;
            font-weight: 400;
            color: var(--color-text-body);
            text-decoration: none;
            font-size: 13px;
            border-radius: 0;
            transition: background 0.15s ease, color 0.15s ease;
        }

        .dropdown-menu a:hover {
            background-color: var(--color-bg-sub);
            color: var(--color-primary);
        }

        .site-header .mobile-menu-toggle {
            display: none;
            background: transparent !important;
            border: none !important;
            box-shadow: none !important;
            cursor: pointer;
            padding: 6px;
            color: var(--color-text-title) !important;
            font-size: 22px;
            line-height: 1;
        }

        /* ==========================================================================
           4. IP 信息栏 (Utility Bar)
           ========================================================================== */
        .utility-bar {
            background-color: var(--color-bg-sub);
            border-bottom: 1px solid var(--color-border);
            padding: 8px 0;
            font-size: 13px;
        }

        .utility-bar-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 8px 16px;
        }

        .utility-left {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
        }

        .utility-ip-block {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
            background-color: var(--color-bg-main);
            padding: 4px 14px 4px 12px;
            border-radius: 4px;
            border: 1px solid var(--color-border);
        }

        .utility-ip-block .ip-label {
            font-weight: 500;
            color: var(--color-text-muted);
            font-size: 12px;
        }

        .utility-ip-block .ip-value {
            font-family: var(--font-mono);
            font-weight: 600;
            color: var(--color-primary);
            font-size: 14px;
        }

        .utility-ip-block .ip-detail {
            color: var(--color-text-body);
            font-size: 12px;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .utility-ip-block .ip-detail .sep {
            color: var(--color-text-muted);
        }

        .utility-ip-block .ip-detail .operator {
            color: var(--color-text-muted);
        }

        .utility-ip-block .ip-link {
            color: var(--color-primary);
            text-decoration: none;
            font-size: 12px;
            font-weight: 500;
            padding: 2px 10px;
            border-radius: 4px;
            background-color: rgba(37, 99, 235, 0.06);
            transition: background var(--transition);
            margin-left: 2px;
        }

        .utility-ip-block .ip-link:hover {
            background-color: rgba(37, 99, 235, 0.12);
        }

        .utility-right {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .utility-tag {
            font-size: 11px;
            padding: 2px 10px;
            border-radius: 4px;
            background-color: rgba(37, 99, 235, 0.08);
            color: var(--color-primary);
            font-weight: 500;
        }

        .utility-tag.green {
            background-color: rgba(16, 185, 129, 0.10);
            color: var(--color-success);
        }

        .utility-stats {
            display: flex;
            gap: 16px;
            color: var(--color-text-muted);
            font-size: 12px;
        }

        .utility-stats span {
            color: var(--color-text-title);
            font-weight: 500;
        }

        /* ==========================================================================
           5. 标准 UI 组件 (UI Elements)
           ========================================================================== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 0 20px;
            height: 44px;
            font-size: 15px;
            font-weight: 500;
            border-radius: 4px;
            border: none;
            cursor: pointer;
            text-decoration: none;
            white-space: nowrap;
            transition: background-color 0.15s ease, border-color 0.15s ease;
            font-family: inherit;
        }

        .btn-primary {
            background-color: var(--color-primary);
            color: #FFFFFF;
        }

        .btn-primary:hover {
            background-color: var(--color-primary-hover);
        }

        .btn-secondary {
            background-color: var(--color-bg-sub);
            color: var(--color-text-body);
            border: 1px solid var(--color-border);
        }

        .btn-secondary:hover {
            background-color: var(--color-bg-hover);
        }

        .btn-large {
            height: 48px;
            padding: 0 28px;
            font-size: 16px;
        }

        .btn-sm {
            height: 32px;
            padding: 0 12px;
            font-size: 13px;
        }

        .btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
        }

        .input-text {
            width: 100%;
            height: 44px;
            padding: 0 14px;
            background-color: #FFFFFF;
            border: 1px solid var(--color-border);
            border-radius: 4px;
            font-size: 15px;
            color: var(--color-text-title);
            font-family: var(--font-mono);
            outline: none;
            transition: border-color 0.15s ease;
        }

        .input-text:focus {
            border-color: var(--color-primary);
        }

        .input-text::placeholder {
            color: var(--color-text-muted);
            font-family: var(--font-stack);
        }

        .field-help {
            font-size: 14px;
            color: var(--color-text-muted);
            margin-top: 8px;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--color-text-muted);
            margin-bottom: 24px;
        }

        .breadcrumb a {
            color: var(--color-text-body);
            text-decoration: none;
        }

        .breadcrumb a:hover {
            color: var(--color-primary);
        }

        .icon {
            width: 20px;
            height: 20px;
            stroke-width: 1.75;
            stroke: currentColor;
            fill: none;
            stroke-linecap: round;
            stroke-linejoin: round;
            flex-shrink: 0;
        }

        .toast {
            position: fixed;
            bottom: 24px;
            right: 24px;
            background-color: var(--color-text-title);
            color: #FFFFFF;
            padding: 10px 18px;
            border-radius: 4px;
            font-size: 14px;
            font-weight: 500;
            display: flex;
            align-items: center;
            gap: 8px;
            z-index: 1000;
            opacity: 0;
            transform: translateY(12px);
            transition: opacity 0.2s ease, transform 0.2s ease;
            pointer-events: none;
        }

        .toast.show {
            opacity: 1;
            transform: translateY(0);
        }

        /* ==========================================================================
           6. 页面视图控制
           ========================================================================== */
        .page-view {
            display: none;
            padding: 0 0 80px 0;
            flex: 1;
        }

        .page-view.active {
            display: block;
        }

        /* ==========================================================================
           7. 首页 (Homepage)
           ========================================================================== */
        .hero-section {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
            padding: 48px 0 40px;
            border-bottom: 1px solid var(--color-border);
            margin-bottom: 40px;
        }

        .hero-left .site-title {
            font-size: 28px;
            font-weight: 600;
            color: var(--color-text-title);
            line-height: var(--lh-title);
            margin-bottom: 8px;
        }

        .hero-left .site-slogan {
            font-size: 16px;
            color: var(--color-text-body);
            font-weight: 400;
            margin-bottom: 20px;
        }

        .quick-metrics {
            display: flex;
            gap: 20px;
            font-size: 13px;
            color: var(--color-text-muted);
        }

        .quick-metrics span {
            color: var(--color-text-title);
            font-weight: 500;
        }

        /* ===== 网络摘要 - index.html 样式 (ip-info-box) ===== */
        .ip-info-box {
            background-color: var(--color-bg-sub);
            border: 1px solid var(--color-border);
            border-radius: 4px;
            padding: 24px;
        }

        .ip-info-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 16px;
            padding-bottom: 12px;
            border-bottom: 1px solid var(--color-border);
        }

        .ip-info-label {
            font-size: 14px;
            color: var(--color-text-muted);
            font-weight: 500;
        }

        .ip-info-status {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 12px;
            color: var(--color-success);
            font-weight: 500;
        }

        .status-dot {
            width: 7px;
            height: 7px;
            border-radius: 50%;
            background-color: var(--color-success);
        }

        .ip-display-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            margin-bottom: 16px;
            min-width: 0;
        }

        .ip-address-display {
            flex: 1 1 auto;
            min-width: 0;
            font-size: 22px;
            font-weight: 600;
            color: var(--color-primary);
            font-family: var(--font-mono);
            letter-spacing: -0.01em;
            word-break: break-all;
            overflow-wrap: anywhere;
            line-height: 1.4;
        }

        .ip-details-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
            font-size: 14px;
        }

        .ip-detail-item {
            display: flex;
            flex-direction: column;
            gap: 2px;
        }

        .ip-detail-item .label {
            font-size: 12px;
            color: var(--color-text-muted);
        }

        .ip-detail-item .val {
            color: var(--color-text-title);
            font-weight: 500;
        }

        /* ===== 工具卡片 - 平铺样式 ===== */
        .tools-section-title {
            font-size: 20px;
            font-weight: 600;
            color: var(--color-text-title);
            margin-bottom: 24px;
        }

        /* ===== 工具分组大卡片 ===== */
        .tool-group {
            border: 1px solid var(--color-border);
            border-radius: 4px;
            padding: 16px 16px 16px 16px;
            margin-bottom: 24px;
            background-color: var(--color-bg-sub);
        }

        .tool-group:last-child {
            margin-bottom: 0;
        }

        .tool-group .group-title {
            font-size: 14px;
            font-weight: 600;
            color: var(--color-text-muted);
            margin-bottom: 12px;
            padding-left: 4px;
            letter-spacing: 0.03em;
        }

        .tool-group .tools-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 12px;
        }

        .tool-card {
            background-color: var(--color-bg-main);
            border: 1px solid var(--color-border);
            border-radius: 4px;
            padding: 16px 18px 14px;
            text-decoration: none;
            display: block;
            transition: border-color 0.15s ease, box-shadow 0.15s ease;
        }

        .tool-card:hover {
            border-color: #94A3B8;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
        }

        .tool-card-header {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 8px;
        }

        .tool-card-icon {
            color: var(--color-text-title);
            flex-shrink: 0;
        }

        .tool-card-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--color-text-title);
        }

        .tool-card-desc {
            font-size: 13px;
            color: var(--color-text-muted);
            line-height: 1.5;
        }

        /* ==========================================================================
           8. 工具通用页 (Tool Detail Page)
           ========================================================================== */
        .tool-page-container {
            max-width: 100%;
            padding-top: 24px;
        }

        .tool-page-header {
            margin-bottom: 28px;
        }

        .tool-page-title {
            font-size: 28px;
            font-weight: 600;
            color: var(--color-text-title);
            line-height: var(--lh-title);
        }

        .tool-action-area {
            margin-bottom: 40px;
        }

        .input-group {
            display: flex;
            gap: 12px;
        }

        .input-group .input-text {
            flex: 1;
            height: 48px;
        }

        .loading-spinner {
            display: inline-block;
            width: 16px;
            height: 16px;
            border: 2px solid rgba(255, 255, 255, 0.3);
            border-radius: 50%;
            border-top-color: #ffffff;
            animation: spin 0.8s linear infinite;
            margin-right: 8px;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        .result-section {
            margin-bottom: 48px;
            border-top: 1px solid var(--color-border);
            padding-top: 32px;
        }

        .result-header {
            font-size: 18px;
            font-weight: 600;
            color: var(--color-text-title);
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .result-card {
            background-color: var(--color-bg-sub);
            border: 1px solid var(--color-border);
            border-radius: 4px;
            padding: 24px;
        }

        .result-table-wrapper {
            width: 100%;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
        }

        .result-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            font-size: 14px;
        }

        .result-table th,
        .result-table td {
            padding: 12px 16px;
            border-bottom: 1px solid var(--color-border);
        }

        .result-table tr:last-child th,
        .result-table tr:last-child td {
            border-bottom: none;
        }

        .result-table th {
            color: var(--color-text-muted);
            font-weight: 400;
            width: 28%;
        }

        .result-table td {
            color: var(--color-text-title);
            font-weight: 500;
        }

        .result-highlight {
            color: var(--color-primary) !important;
            font-weight: 600 !important;
            font-family: var(--font-mono);
        }

        .tool-doc-section {
            border-top: 1px solid var(--color-border);
            padding-top: 32px;
            font-size: 14px;
            color: var(--color-text-muted);
            line-height: 1.7;
        }

        .tool-doc-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--color-text-body);
            margin-bottom: 8px;
        }

        /* ==========================================================================
           9. 使用帮助页 (Help & FAQ)
           ========================================================================== */
        .help-layout {
            display: grid;
            grid-template-columns: 200px 1fr;
            gap: 48px;
            align-items: start;
            padding-top: 24px;
        }

        .help-sidebar {
            position: sticky;
            top: 88px;
        }

        .help-nav {
            list-style: none;
        }

        .help-nav li {
            margin-bottom: 12px;
        }

        .help-nav a {
            color: var(--color-text-body);
            text-decoration: none;
            font-size: 14px;
            font-weight: 400;
            display: block;
            padding: 4px 0;
            transition: color 0.15s ease;
        }

        .help-nav a:hover,
        .help-nav a.active {
            color: var(--color-primary);
            font-weight: 500;
        }

        .help-content {
            max-width: 720px;
        }

        .help-article-title {
            font-size: 28px;
            font-weight: 600;
            color: var(--color-text-title);
            margin-bottom: 32px;
            line-height: var(--lh-title);
        }

        .faq-item {
            margin-bottom: 36px;
            scroll-margin-top: 88px;
        }

        .faq-question {
            font-size: 18px;
            font-weight: 600;
            color: var(--color-text-title);
            margin-bottom: 12px;
        }

        .faq-answer {
            font-size: 15px;
            color: var(--color-text-body);
            line-height: 1.7;
        }

        /* ==========================================================================
           10. 页脚 (Footer)
           ========================================================================== */
        /* 屏蔽 Astra 主题默认页脚，避免与自定义页脚冲突 */
        .site-below-footer-wrap,
        .ast-footer-copyright,
        .ast-footer-widget-area,
        .footer-adv {
            display: none !important;
        }

        .site-footer {
            background-color: var(--color-bg-main);
            border-top: 1px solid var(--color-border);
            padding: 24px 0;
            margin-top: auto;
            font-size: 14px;
            color: var(--color-text-muted);
        }

        .footer-wrapper {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .footer-links,
        .footer-links li {
            display: flex;
            gap: 24px;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .footer-links a {
            color: var(--color-text-muted);
            text-decoration: none;
        }

        .footer-links a:hover {
            color: var(--color-text-body);
        }

        /* ==========================================================================
           11. 移动端响应式适配
           ========================================================================== */
        @media (max-width: 820px) {
            .site-nav {
                gap: 0;
            }
            .site-nav>li>a {
                font-size: 13px;
                padding: 6px 10px;
            }

            .utility-bar-inner {
                flex-direction: row;
                justify-content: space-between;
                align-items: center;
                flex-wrap: nowrap;
                gap: 4px;
            }

            .utility-left {
                flex: 1;
                min-width: 0;
            }

            .utility-ip-block {
                background: none;
                border: none;
                padding: 0;
                border-radius: 0;
                gap: 4px;
                flex-wrap: nowrap;
                width: 100%;
                overflow: hidden;
            }

            .utility-ip-block .ip-label {
                display: none !important;
            }

            .utility-ip-block .ip-value {
                font-size: 13px;
                color: var(--color-primary);
                white-space: nowrap;
                overflow: hidden;
                text-overflow: ellipsis;
                flex-shrink: 1;
                min-width: 0;
            }

            .utility-ip-block .ip-detail {
                display: none !important;
            }

            .utility-ip-block .ip-link {
                font-size: 12px;
                padding: 2px 6px;
                background: none;
                color: var(--color-primary);
                margin-left: 4px;
                flex-shrink: 0;
                white-space: nowrap;
            }

            .utility-ip-block .ip-link:hover {
                background: none;
                text-decoration: underline;
            }

            .utility-right {
                gap: 4px;
                flex-shrink: 0;
            }

            .utility-tag {
                font-size: 10px;
                padding: 1px 6px;
            }

            .utility-tag.green {
                display: none !important;
            }

            .utility-stats {
                display: none !important;
            }

            .hero-section {
                grid-template-columns: 1fr;
                gap: 32px;
                padding-bottom: 36px;
                margin-bottom: 36px;
            }
            .hero-left .site-title {
                font-size: 22px;
            }

            .tool-group .tools-grid {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }

            .tool-group {
                padding: 12px 12px 4px 12px;
            }

            .dropdown-menu {
                position: static;
                border: none;
                box-shadow: none;
                padding-left: 16px;
                background-color: var(--color-bg-sub);
                margin-top: 2px;
                border-radius: 4px;
                opacity: 1;
                visibility: visible;
                transform: none;
                display: none;
                pointer-events: auto;
                width: 100%;
            }

            .dropdown.open .dropdown-menu {
                display: block;
            }

            .dropdown:hover .dropdown-menu {
                display: none;
            }

            .dropdown.open .dropdown-menu {
                display: block;
            }

            .dropdown-toggle::after {
                content: " ▾";
            }

            .ip-details-grid {
                grid-template-columns: 1fr 1fr;
                gap: 8px;
            }
        }

        @media (max-width: 768px) {
            body .site-header {
                height: 56px;
            }

            .site-header .mobile-menu-toggle {
                display: block;
            }

            /* 移动端本机 IP 信息栏单行精简样式 */
            .utility-bar-inner {
                flex-direction: row;
                justify-content: space-between;
                align-items: center;
                flex-wrap: nowrap;
                gap: 4px;
            }

            .utility-left {
                flex: 1;
                min-width: 0;
            }

            .utility-ip-block {
                background: none;
                border: none;
                padding: 0;
                border-radius: 0;
                gap: 4px;
                flex-wrap: nowrap;
                width: 100%;
                overflow: hidden;
            }

            .utility-ip-block .ip-label,
            .utility-ip-block .ip-detail,
            .utility-stats,
            .utility-tag.green {
                display: none !important;
            }

            .utility-ip-block .ip-value {
                font-size: 13px;
                color: var(--color-primary);
                white-space: nowrap;
                overflow: hidden;
                text-overflow: ellipsis;
                flex-shrink: 1;
                min-width: 0;
            }

            .utility-ip-block .ip-link {
                font-size: 12px;
                padding: 2px 6px;
                background: none;
                color: var(--color-primary);
                margin-left: 4px;
                flex-shrink: 0;
                white-space: nowrap;
            }

            .utility-right {
                gap: 4px;
                flex-shrink: 0;
            }

            .utility-tag {
                font-size: 10px;
                padding: 1px 6px;
            }

            .site-nav {
                display: none;
                position: absolute;
                top: 56px;
                left: 0;
                right: 0;
                background-color: var(--color-bg-main);
                border-bottom: 1px solid var(--color-border);
                flex-direction: column;
                padding: 12px 20px;
                gap: 4px;
                box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
                max-height: 80vh;
                overflow-y: auto;
                align-items: stretch;
                text-align: left;
                z-index: 200;
            }

            .site-nav.mobile-open {
                display: flex;
            }

            .site-nav>li>a {
                padding: 8px 12px;
                font-size: 14px;
                width: 100%;
            }

            .tool-page-title {
                font-size: 22px;
            }

            .input-group {
                flex-direction: column;
            }

            .input-group .btn {
                width: 100%;
                height: 48px;
            }

            .result-table-wrapper {
                overflow-x: auto;
                -webkit-overflow-scrolling: touch;
            }

            .help-layout {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .help-sidebar {
                position: static;
                border-bottom: 1px solid var(--color-border);
                padding-bottom: 16px;
            }

            .help-nav {
                display: flex;
                gap: 16px;
                overflow-x: auto;
                padding-bottom: 8px;
            }

            .help-nav li {
                margin-bottom: 0;
                white-space: nowrap;
            }

            .footer-wrapper {
                flex-direction: column;
                gap: 12px;
                align-items: flex-start;
            }
        }

        @media (max-width: 480px) {
            .tool-group .tools-grid {
                grid-template-columns: 1fr;
                gap: 8px;
            }
            .hero-left .site-title {
                font-size: 20px;
            }
            .quick-metrics {
                flex-direction: column;
                gap: 8px;
            }

            .utility-bar-inner {
                flex-wrap: nowrap;
            }

            .utility-ip-block .ip-value {
                font-size: 12px;
            }
            .utility-ip-block .ip-link {
                font-size: 11px;
                padding: 2px 4px;
            }
            .utility-tag {
                font-size: 9px;
                padding: 1px 4px;
            }
            .utility-tag.green {
                display: none !important;
            }

            .ip-details-grid {
                grid-template-columns: 1fr;
                gap: 6px;
            }
            .ip-address-display {
                font-size: 18px;
                word-break: break-all;
                overflow-wrap: anywhere;
            }
        }

        /* ===== 文章栏目 ===== */
        .article-section {
            margin-top: 0;
        }
        .article-columns {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
        }
        .article-column {
            background-color: var(--color-bg-sub);
            border: 1px solid var(--color-border);
            border-radius: 4px;
            padding: 16px;
        }
        .article-column-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 12px;
            padding-left: 8px;
            border-left: 3px solid #3B82F6;
        }
        .article-column-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--color-text-title);
        }
        .article-column-more {
            font-size: 13px;
            color: var(--color-text-muted);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 2px;
        }
        .article-column-more:hover {
            color: #3B82F6;
        }
        .article-list {
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .article-list li {
            margin-bottom: 10px;
        }
        .article-list li:last-child {
            margin-bottom: 0;
        }
        .article-list a {
            display: flex;
            align-items: center;
            gap: 8px;
            text-decoration: none;
            color: var(--color-text-title);
            font-size: 14px;
            line-height: 1.4;
        }
        .article-list a:hover {
            color: #3B82F6;
        }
        .article-list .arrow {
            color: var(--color-text-muted);
            font-size: 10px;
            flex-shrink: 0;
        }
        .article-list .title {
            flex: 1;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }
        .article-list .date {
            color: var(--color-text-muted);
            font-size: 12px;
            flex-shrink: 0;
        }
        .article-empty {
            color: var(--color-text-muted);
            font-size: 13px;
            padding: 12px 0;
            text-align: center;
        }
        @media (max-width: 768px) {
            .article-columns {
                grid-template-columns: 1fr;
            }
        }