* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --primary: #0a2540;
            --primary-dark: #051a2c;
            --primary-light: #1a4a6e;
            --secondary: #0052cc;
            --accent: #00a3ff;
            --gray-50: #f8fafc;
            --gray-100: #f1f5f9;
            --gray-200: #e2e8f0;
            --gray-300: #cbd5e1;
            --gray-600: #475569;
            --gray-700: #334155;
            --gray-800: #1e293b;
            --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
            --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
            --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
            --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
            --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --radius-2xl: 40px;
            --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
            background: linear-gradient(180deg, var(--gray-50) 0%, #ffffff 100%);
            color: var(--gray-800);
            line-height: 1.5;
            -webkit-font-smoothing: antialiased;
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        .navbar {
            background: rgba(255,255,255,0.98);
            backdrop-filter: blur(12px);
            position: sticky;
            top: 0;
            z-index: 100;
            border-bottom: 1px solid rgba(0,0,0,0.05);
            transition: var(--transition-smooth);
        }

        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
            padding: 16px 0;
        }

        .logo {
            display: flex;
            flex-direction: column;
            gap: 2px;
        }

        .logo h1 {
            font-size: 1.5rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            letter-spacing: -0.3px;
        }

        .logo p {
            font-size: 0.7rem;
            color: var(--gray-600);
            letter-spacing: 0.3px;
            line-height: 1.2;
        }

        .contact-header {
            display: flex;
            gap: 20px;
            background: var(--gray-100);
            padding: 8px 24px;
            border-radius: 60px;
            backdrop-filter: blur(4px);
            align-items: center;
            margin-top: 8px;
        }

        .contact-item {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.8rem;
            font-weight: 500;
            color: var(--gray-700);
            transition: var(--transition-fast);
            cursor: pointer;
        }

        .contact-item i {
            font-size: 0.9rem;
            color: var(--secondary);
        }

        .contact-item:hover {
            color: var(--secondary);
        }

        .contact-item:hover i {
            transform: scale(1.05);
        }

        .contact-full { display: inline; }
        .contact-short { display: none; }

        .contact-divider {
            width: 1px;
            height: 20px;
            background: var(--gray-300);
        }

        .hero {
            position: relative;
            background: linear-gradient(135deg, #ffffff 0%, #f0f7ff 100%);
            border-radius: var(--radius-2xl);
            margin: 4px 0 24px;
            padding: 28px 48px;
            overflow: hidden;
            isolation: isolate;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -30%;
            width: 60%;
            height: 150%;
            background: radial-gradient(circle, rgba(0,163,255,0.06) 0%, transparent 70%);
            border-radius: 50%;
            z-index: -1;
        }

        .hero::after {
            content: '';
            position: absolute;
            bottom: -30%;
            left: -20%;
            width: 50%;
            height: 100%;
            background: radial-gradient(circle, rgba(0,82,204,0.04) 0%, transparent 70%);
            border-radius: 50%;
            z-index: -1;
        }

        .hero-header {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            margin-bottom: 20px;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: linear-gradient(135deg, var(--secondary), var(--accent));
            color: white;
            padding: 8px 20px;
            border-radius: 60px;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.5px;
            white-space: nowrap;
        }

        .hero-badge i {
            font-size: 0.9rem;
        }

        .hero-slogan {
            font-size: 0.85rem;
            font-weight: 500;
            color: var(--secondary);
            background: rgba(0,82,204,0.06);
            padding: 6px 16px;
            border-radius: 60px;
            letter-spacing: 0.3px;
            border: 1px solid rgba(0,82,204,0.15);
            white-space: nowrap;
        }

        .hero-slogan i {
            margin-right: 6px;
            color: var(--accent);
            font-size: 0.75rem;
        }

        @media (max-width: 860px) {
            .hero-header {
                flex-direction: column;
                align-items: flex-start;
                gap: 10px;
            }

            .hero-slogan {
                white-space: normal;
                font-size: 0.75rem;
            }
        }

        .company-intro {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
            margin-bottom: 0;
        }

        .intro-card {
            background: white;
            border-radius: var(--radius-xl);
            padding: 28px;
            border: 1px solid var(--gray-200);
            transition: all 0.3s ease;
        }

        .intro-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }

        .intro-card-header {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-bottom: 20px;
            padding-bottom: 16px;
            border-bottom: 2px solid var(--gray-100);
        }

        .intro-card-icon {
            width: 52px;
            height: 52px;
            background: linear-gradient(135deg, #eef2ff, #e0e7ff);
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .intro-card-icon i {
            font-size: 1.6rem;
            color: var(--secondary);
        }

        .intro-card-title {
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--primary);
        }

        .intro-card-subtitle {
            font-size: 0.75rem;
            color: var(--gray-600);
        }

        .intro-card-content {
            font-size: 0.95rem;
            color: var(--gray-700);
            line-height: 1.65;
        }

        .intro-card-content p {
            margin-bottom: 12px;
        }

        .intro-card-content p:last-child {
            margin-bottom: 0;
        }

        .industry-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 16px;
        }

        .industry-tag {
            background: var(--gray-100);
            padding: 6px 14px;
            border-radius: 30px;
            font-size: 0.75rem;
            font-weight: 500;
            color: var(--gray-700);
            transition: all 0.2s;
            cursor: pointer;
        }

        .industry-tag:hover {
            background: var(--secondary);
            color: white;
            transform: translateY(-2px);
        }

.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 24px 0 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--gray-800);
}

.section-title i {
    font-size: 1.6rem;
    color: var(--secondary);
}

        .tools-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            margin: 20px 0 0;
        }

        .tool-card {
            background: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);
            border-radius: var(--radius-xl);
            padding: 28px 20px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.2, 0.9, 0.4, 1.1);
            border: 1px solid #e2e8f0;
            position: relative;
            overflow: hidden;
            box-shadow: 0 2px 8px rgba(0,0,0,0.04);
        }

        .tool-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, #0052cc, #00a3ff, #0052cc);
            transform: scaleX(0);
            transition: transform 0.4s ease;
        }

        .tool-card:hover {
            transform: translateY(-6px);
            border-color: transparent;
            box-shadow: 0 20px 30px -12px rgba(0,82,204,0.25);
            background: linear-gradient(145deg, #ffffff 0%, #f0f7ff 100%);
        }

        .tool-card:hover::before {
            transform: scaleX(1);
        }

        .tool-icon {
            width: 72px;
            height: 72px;
            background: linear-gradient(145deg, #eef2ff, #e0e7ff);
            border-radius: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            transition: all 0.3s ease;
        }

        .tool-card:hover .tool-icon {
            background: linear-gradient(145deg, #0052cc, #00a3ff);
            transform: scale(1.05) rotate(3deg);
            box-shadow: 0 8px 20px -6px rgba(0,82,204,0.4);
        }

        .tool-icon i {
            font-size: 2rem;
            color: #0052cc;
            transition: all 0.3s ease;
        }

        .tool-card:hover .tool-icon i {
            color: white;
            transform: scale(1.05);
        }

        .tool-card h4 {
            font-weight: 700;
            font-size: 1rem;
            margin-bottom: 8px;
            color: #1e293b;
            transition: color 0.2s ease;
        }

        .tool-card:hover h4 {
            color: #0052cc;
        }

        .tool-card p {
            font-size: 0.75rem;
            color: #64748b;
            line-height: 1.5;
            transition: color 0.2s ease;
        }

        .tool-card:hover p {
            color: #475569;
        }

        .feature-section {
            background: white;
            border-radius: var(--radius-xl);
            padding: 40px;
            margin: 32px 0;
            border: 1px solid var(--gray-200);
            transition: var(--transition-smooth);
        }

        .feature-section:hover {
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }

        /* ✅ SEO：区块标题已由 h3 提升为 h2（h1 之后不再跳级），样式同步跟随 h2 */
        .feature-section h2 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            gap: 12px;
            color: var(--gray-800);
        }

        .feature-section h2 i {
            color: var(--secondary);
            font-size: 1.6rem;
        }

        /* ✅ 首页「最新开票疑难」文章内链区块（SEO：把内链权重从首页传给文章详情） */
        .latest-articles {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 14px;
            margin-top: 4px;
        }
        .latest-article-item {
            display: flex;
            flex-direction: column;
            gap: 8px;
            padding: 16px;
            background: #fff;
            border: 1px solid #e6ecf3;
            border-radius: 10px;
            text-decoration: none;
            color: inherit;
            transition: all .25s ease;
        }
        .latest-article-item:hover {
            border-color: var(--secondary, #1677ff);
            box-shadow: 0 6px 18px rgba(22, 119, 255, .10);
            transform: translateY(-2px);
        }
        .latest-article-title {
            font-size: 1rem;
            font-weight: 600;
            line-height: 1.5;
            color: var(--gray-800, #1f2937);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .latest-article-summary {
            font-size: .875rem;
            color: #64748b;
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .latest-articles-more {
            margin-top: 14px;
            text-align: right;
        }
        .latest-articles-more a {
            color: var(--secondary, #1677ff);
            text-decoration: none;
            font-size: .9rem;
        }

.feature-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

/* ✅ 智能开票·全场景指引（guideGrid）：改为一行 5 个卡片，与 .tool-icon 视觉对齐（72×72 渐变圆角方块 + 2rem 图标） */
#guideGrid.feature-grid {
    grid-template-columns: repeat(5, 1fr);
    gap: 18px;
}
#guideGrid.feature-grid .feature-item {
    padding: 22px 14px;
}
#guideGrid.feature-grid .feature-item .guide-icon {
    width: 72px;
    height: 72px;
    background: linear-gradient(145deg, #eef2ff, #e0e7ff);
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 14px;
    transition: all 0.3s ease;
}
#guideGrid.feature-grid .feature-item:hover .guide-icon {
    background: linear-gradient(145deg, #0052cc, #00a3ff);
    transform: scale(1.05) rotate(3deg);
    box-shadow: 0 8px 20px -6px rgba(0,82,204,0.4);
}
#guideGrid.feature-grid .feature-item .guide-icon i {
    font-size: 2rem;
    color: #0052cc;
    margin: 0;
    transition: all 0.3s ease;
}
#guideGrid.feature-grid .feature-item:hover .guide-icon i {
    color: #fff;
    transform: scale(1.05);
}
#guideGrid.feature-grid .feature-item h3 { font-size: 1rem; }
#guideGrid.feature-grid .feature-item p { font-size: 0.72rem; }

        .feature-item {
            position: relative;
            text-align: center;
            padding: 28px 20px;
            border-radius: var(--radius-lg);
            transition: all 0.3s ease;
            cursor: pointer;
            background: linear-gradient(145deg, #f8fafc, #f1f5f9);
            overflow: visible;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            border: 1px solid #e2e8f0;
        }

        .feature-item:hover {
            background: linear-gradient(145deg, #ffffff, #f0f7ff);
            transform: translateY(-4px);
            border-color: #0052cc;
            box-shadow: 0 12px 25px -10px rgba(0,82,204,0.2);
        }

        .feature-item i {
            font-size: 2.2rem;
            color: #0052cc;
            margin-bottom: 14px;
            display: inline-block;
            transition: all 0.3s ease;
        }

        .feature-item:hover i {
            transform: scale(1.1);
            color: #00a3ff;
        }

        .feature-item h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: #1e293b;
            transition: color 0.2s ease;
        }

        .feature-item:hover h3 {
            color: #0052cc;
        }

        .feature-item p {
            font-size: 0.8rem;
            color: #64748b;
            line-height: 1.5;
            text-align: center;
            transition: color 0.2s ease;
        }

        .feature-item:hover p {
            color: #475569;
        }

        .function-item {
            position: relative;
            text-align: center;
            padding: 24px 20px;
            border-radius: var(--radius-lg);
            transition: all 0.3s ease;
            cursor: pointer;
            background: linear-gradient(145deg, #f8fafc, #f1f5f9);
            overflow: visible;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            border: 1px solid #e2e8f0;
        }

        .function-item:hover {
            background: linear-gradient(145deg, #ffffff, #eef2ff);
            transform: translateY(-4px);
            border-color: #0052cc;
            box-shadow: 0 12px 25px -10px rgba(0,82,204,0.2);
        }

        .function-item h3 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: #1e293b;
            transition: color 0.2s ease;
        }

        .function-item:hover h3 {
            color: #0052cc;
        }

        .function-item p {
            font-size: 0.75rem;
            color: #64748b;
            line-height: 1.5;
            text-align: center;
        }

        .function-tooltip {
            position: absolute;
            bottom: calc(100% + 12px);
            left: 50%;
            transform: translateX(-50%);
            background: #1e293b;
            color: white;
            padding: 14px 18px;
            border-radius: var(--radius-md);
            font-size: 0.85rem;
            line-height: 1.5;
            width: 260px;
            text-align: center;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s cubic-bezier(0.2, 0.9, 0.4, 1.1);
            z-index: 1000;
            box-shadow: 0 20px 30px -12px rgba(0,0,0,0.25);
            pointer-events: none;
        }

        .function-tooltip::after {
            content: '';
            position: absolute;
            top: 100%;
            left: 50%;
            transform: translateX(-50%);
            border-width: 8px;
            border-style: solid;
            border-color: #1e293b transparent transparent transparent;
        }

        .function-item:hover .function-tooltip {
            opacity: 1;
            visibility: visible;
            transform: translateX(-50%) translateY(0);
        }

        /* 二维码弹窗样式 */
        .qrcode-tooltip {
            position: fixed;
            background: linear-gradient(145deg, #ffffff 0%, #f0f7ff 100%);
            backdrop-filter: blur(20px);
            border-radius: 28px;
            padding: 24px 24px 22px 24px;
            box-shadow: 0 25px 50px -12px rgba(0,0,0,0.2), 0 0 0 1px rgba(0,82,204,0.1);
            z-index: 1000;
            min-width: 260px;
            max-width: 320px;
            width: auto;
            text-align: center;
            pointer-events: none;
            transition: all 0.25s cubic-bezier(0.2, 0.9, 0.4, 1.1);
            border: none;
            opacity: 0;
            visibility: hidden;
        }

        .qrcode-tooltip.visible {
            opacity: 1;
            visibility: visible;
        }

        .qrcode-tooltip.arrow-left::before {
            content: '';
            position: absolute;
            left: -7px;
            top: 50%;
            transform: translateY(-50%) rotate(45deg);
            width: 14px;
            height: 14px;
            background: linear-gradient(145deg, #ffffff 0%, #f0f7ff 100%);
            border-left: 1px solid rgba(0,82,204,0.1);
            border-bottom: 1px solid rgba(0,82,204,0.1);
        }

        .qrcode-tooltip.arrow-right::before {
            content: '';
            position: absolute;
            right: -7px;
            top: 50%;
            transform: translateY(-50%) rotate(45deg);
            width: 14px;
            height: 14px;
            background: linear-gradient(145deg, #ffffff 0%, #f0f7ff 100%);
            border-right: 1px solid rgba(0,82,204,0.1);
            border-top: 1px solid rgba(0,82,204,0.1);
        }

        .qrcode-tooltip.arrow-bottom::before {
            content: '';
            position: absolute;
            top: -7px;
            left: 50%;
            transform: translateX(-50%) rotate(45deg);
            width: 14px;
            height: 14px;
            background: linear-gradient(145deg, #ffffff 0%, #f0f7ff 100%);
            border-left: 1px solid rgba(0,82,204,0.1);
            border-top: 1px solid rgba(0,82,204,0.1);
        }

        .qrcode-tooltip.arrow-top::before {
            content: '';
            position: absolute;
            bottom: -7px;
            left: 50%;
            transform: translateX(-50%) rotate(45deg);
            width: 14px;
            height: 14px;
            background: linear-gradient(145deg, #ffffff 0%, #f0f7ff 100%);
            border-right: 1px solid rgba(0,82,204,0.1);
            border-bottom: 1px solid rgba(0,82,204,0.1);
        }

        .tooltip-placeholder img {
            width: 160px;
            height: 160px;
            border-radius: 20px;
            border: 2px solid rgba(0,82,204,0.15);
            box-shadow: 0 8px 20px -6px rgba(0,0,0,0.12);
            background: white;
            padding: 8px;
        }

        .scan-hint {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: linear-gradient(135deg, #0052cc 0%, #00a3ff 100%);
            padding: 6px 14px;
            border-radius: 40px;
            font-size: 0.65rem;
            color: white;
            margin-top: 14px;
            font-weight: 600;
            box-shadow: 0 4px 12px rgba(0,82,204,0.25);
        }

        .scan-hint i {
            font-size: 0.7rem;
            animation: pulse 1.5s infinite;
        }

        @keyframes pulse {
            0%, 100% {
                opacity: 1;
                transform: scale(1);
            }
            50% {
                opacity: 0.7;
                transform: scale(0.95);
            }
        }

        .toast-message {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: white;
            border-radius: 16px;
            padding: 16px 20px;
            box-shadow: var(--shadow-2xl);
            z-index: 10001;
            min-width: 320px;
            max-width: 450px;
            border: 1px solid var(--gray-200);
            animation: slideIn 0.3s ease;
        }

        @keyframes slideIn {
            from {
                opacity: 0;
                transform: translateX(100px);
            }
            to {
                opacity: 1;
                transform: translateX(0);
            }
        }

        .btn-primary {
            background: linear-gradient(135deg, #0052cc, #00a3ff);
            color: white;
            border: none;
            padding: 8px 20px;
            border-radius: 30px;
            font-size: 0.75rem;
            cursor: pointer;
            transition: 0.2s;
        }

        .btn-primary:hover {
            transform: scale(1.02);
        }

        .btn-secondary {
            background: transparent;
            color: #0052cc;
            border: 1px solid #0052cc;
            padding: 8px 20px;
            border-radius: 30px;
            font-size: 0.75rem;
            cursor: pointer;
            transition: 0.2s;
        }

        .btn-secondary:hover {
            background: rgba(0,82,204,0.05);
        }

        .loading-spinner {
            text-align: center;
            padding: 60px;
            grid-column: 1/-1;
        }

        .loading-spinner i {
            font-size: 2rem;
            color: var(--secondary);
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            from {
                transform: rotate(0deg);
            }
            to {
                transform: rotate(360deg);
            }
        }

        .fade-in-up {
            animation: fadeInUp 0.6s ease forwards;
        }

        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        footer {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
            color: #cbd5e1;
            padding: 40px 0 32px;
            border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
            margin-top: 48px;
            text-align: center;
        }

        .footer-bottom {
            font-size: 0.75rem;
        }

        .footer-bottom p {
            margin-bottom: 8px;
        }

        .icp-info {
            margin-top: 12px;
            padding-top: 8px;
            border-top: 1px solid rgba(203, 213, 225, 0.2);
            font-size: 0.7rem;
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
        }

        .icp-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: #94a3b8;
            text-decoration: none;
            transition: color 0.2s ease;
        }

        .icp-link:hover {
            color: #60a5fa;
            text-decoration: underline;
        }

        .icp-link img {
            width: 16px;
            height: 16px;
            vertical-align: middle;
        }

        .icp-separator {
            margin: 0 8px;
            color: #475569;
        }

        @media (max-width: 1024px) {
            .tools-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .feature-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .company-intro {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }

        @media (max-width: 768px) {
            .tools-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .feature-grid {
                grid-template-columns: 1fr;
            }
            .hero {
                padding: 20px 20px;
                margin: 0 0 16px;
            }
            .intro-card {
                padding: 20px;
            }
            .section-title {
                margin: 16px 0 12px;
                font-size: 1.3rem;
            }
            .feature-section {
                padding: 24px 20px;
                margin: 20px 0;
            }
            .nav-container {
                justify-content: center;
                flex-direction: column;
                gap: 8px;
                padding: 10px 0;
            }
            .contact-header {
                display: flex;
                flex-wrap: nowrap;
                gap: 6px;
                padding: 4px 10px;
                margin-top: 0;
            }
            .contact-item {
                font-size: clamp(0.55rem, 2.6vw, 0.8rem);
                white-space: nowrap;
                flex-shrink: 0;
                gap: 3px;
            }
            .contact-item i { font-size: 0.75rem; }
            .contact-divider { height: 12px; }
            .contact-full { display: none; }
            .contact-short { display: inline; }
        }

        @media (max-width: 480px) {
            .tools-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ✅ 智能开票·全场景指引（guideGrid）移动端适配：
           由于 #guideGrid.feature-grid 显式声明了 5 列，特异性高于普通 @media .feature-grid，
           必须单独为它在各断点覆盖列数，否则小屏幕下仍保持 5 列导致卡片被压窄。 */
        @media (max-width: 1024px) {
            #guideGrid.feature-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }
        @media (max-width: 768px) {
            #guideGrid.feature-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            #guideGrid.feature-grid .feature-item {
                padding: 18px 12px;
            }
        }
        @media (max-width: 480px) {
            #guideGrid.feature-grid {
                grid-template-columns: 1fr;
            }
            #guideGrid.feature-grid .feature-item .guide-icon {
                width: 60px;
                height: 60px;
            }
            #guideGrid.feature-grid .feature-item .guide-icon i {
                font-size: 1.7rem;
            }
        }

        /* 超窄屏隐藏总部热线，确保联系方式一行显示 */
        @media (max-width: 400px) {
            .contact-extra { display: none !important; }
        }