:root {
    --product-primary: #2563eb;
    --product-primary-dark: #1d4ed8;
    --product-dark: #1b2433;
    --product-text: #334155;
    --product-muted: #667085;
    --product-border: #e4e8ef;
    --product-bg: #f6f8fb;
}

body.software-preview-page {
    margin: 0;
    color: var(--product-text);
    background: var(--product-bg);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    -webkit-font-smoothing: antialiased;
}

.product-navbar {
    position: sticky;
    top: 0;
    z-index: 1030;
    min-height: 66px;
    border-bottom: 1px solid var(--product-border);
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(10px);
}

.product-navbar .container {
    min-height: 66px;
}

.product-brand {
    display: inline-flex;
    min-width: 0;
    align-items: center;
    gap: 10px;
    color: var(--product-dark) !important;
    font-size: 16px;
    font-weight: 700;
    text-decoration: none !important;
}

.product-brand-mark {
    display: inline-grid;
    flex: 0 0 34px;
    width: 34px;
    height: 34px;
    place-items: center;
    border-radius: 8px;
    color: #fff;
    background: var(--product-primary);
    font-size: 15px;
}

.product-nav {
    align-items: center;
    gap: 4px;
}

.product-nav-link {
    padding: 7px 11px;
    border-radius: 6px;
    color: var(--product-muted) !important;
    font-size: 13px;
    text-decoration: none !important;
}

.product-nav-link:hover,
.product-nav-link.active {
    color: var(--product-primary) !important;
    background: #eff5ff;
}

.product-page-head {
    padding: 58px 0 40px;
    border-bottom: 1px solid var(--product-border);
    background: var(--product-bg);
}

.product-page-head h1 {
    margin: 0 0 10px;
    color: var(--product-dark);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 750;
    line-height: 1.15;
    letter-spacing: -0.04em;
}

.product-page-head p {
    max-width: 680px;
    margin: 0;
    color: var(--product-muted);
    font-size: 14px;
    line-height: 1.8;
}

.product-eyebrow {
    display: inline-block;
    margin-bottom: 13px;
    color: var(--product-primary);
    font-size: 12px;
    font-weight: 650;
}

.product-section {
    padding: 58px 0;
}

.category-tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
    gap: 12px;
}

.category-tool-card {
    display: flex;
    min-height: 62px;
    align-items: center;
    gap: 11px;
    padding: 12px 14px;
    border: 1px solid var(--product-border);
    border-radius: 8px;
    color: var(--product-text) !important;
    background: #fff;
    text-decoration: none !important;
    transition: border-color 0.18s ease, background 0.18s ease;
}

.category-tool-card:hover {
    border-color: #b8ccf7;
    background: #f8faff;
}

.category-tool-icon {
    display: inline-grid;
    flex: 0 0 36px;
    width: 36px;
    height: 36px;
    place-items: center;
    border-radius: 8px;
    color: var(--product-primary);
    background: #edf4ff;
    font-size: 18px;
}

.category-tool-name {
    flex: 1;
    color: var(--product-dark);
    font-size: 13px;
    font-weight: 600;
}

.category-tool-go {
    color: #9ba8ba;
    font-size: 13px;
}

.product-empty {
    padding: 58px 20px;
    border: 1px dashed #d5dce6;
    border-radius: 10px;
    color: #8a94a4;
    background: #fff;
    text-align: center;
}

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

.btn-primary:hover,
.btn-primary:focus {
    border-color: var(--product-primary-dark);
    background: var(--product-primary-dark);
}

.product-footer {
    padding: 26px 0;
    border-top: 1px solid var(--product-border);
    color: #8a94a4;
    background: #fff;
    font-size: 12px;
}

@media (max-width: 767.98px) {
    .product-navbar .container {
        flex-wrap: wrap;
        padding-top: 11px;
        padding-bottom: 9px;
    }

    .product-nav {
        width: 100%;
        margin-top: 7px;
        padding-top: 7px;
        overflow-x: auto;
        border-top: 1px solid var(--product-border);
        flex-wrap: nowrap;
    }

    .product-nav-link {
        white-space: nowrap;
    }

    .category-tool-grid {
        grid-template-columns: 1fr;
    }
}