/* 首页手机端细节优化：减少首屏高度、提升触控与阅读密度 */
@media (max-width: 768px) {
    html { scroll-padding-top: 64px; }
    body { font-size: 15px; overflow-x: hidden; padding-bottom: 62px; }
    .wrap { padding-left: 16px; padding-right: 16px; }
    .topline { display: none; }
    .header { position: sticky; top: 0; }
    .nav-wrap { height: 64px; }
    .brand { gap: 8px; min-width: 0; }
    .brand-logo { width: 39px; height: 39px; border-radius: 7px; }
    .brand-text strong { font-size: 17px; letter-spacing: 0; }
    .brand-text small { font-size: 9px; letter-spacing: 0; white-space: nowrap; }
    .menu-btn { display: flex; width: 44px; height: 44px; align-items: center; justify-content: center; gap: 4px; }
    .menu-btn span { width: 24px; height: 2px; }
    .nav { top: 64px; padding: 8px 16px 16px; gap: 0; max-height: calc(100vh - 64px); overflow-y: auto; }
    .nav a { width: 100%; padding: 13px 4px; border-bottom: 1px solid var(--line); font-size: 15px; }
    .nav a::after { display: none; }
    .nav .nav-cta { margin-top: 12px; padding: 13px 16px !important; text-align: center; border: 0; }
    body.menu-open { overflow: hidden; }
    .ff-hero-grid { min-height: 0; gap: 22px; }
    .ff-hero-copy { padding: 45px 0 0; }
    .ff-kicker { font-size: 10px; letter-spacing: 1.2px; margin-bottom: 14px; }
    .ff-hero h1 { font-size: clamp(31px, 9vw, 42px); line-height: 1.18; margin-bottom: 15px; }
    .ff-hero-intro { font-size: 14px; line-height: 1.75; }
    .ff-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; margin: 22px 0 26px; }
    .ff-btn { min-height: 46px; justify-content: center; padding: 11px 10px; font-size: 13px; gap: 7px; }
    .ff-proof { gap: 0; justify-content: space-between; padding-top: 16px; }
    .ff-proof b { font-size: 18px; }
    .ff-proof span { font-size: 10px; }
    .ff-hero-visual { height: 190px; margin: 0 -16px; }
    .ff-float { left: 16px; bottom: 14px; padding: 11px 13px; font-size: 12px; }
    .ff-float span { font-size: 10px; }
    .ff-strip .wrap { min-height: 48px; gap: 13px; padding-right: 0; font-size: 11px; }
    .ff-strip i { flex: 0 0 3px; }
    .ff-strip a { font-size: 11px; padding-right: 16px; }
    .ff-heading { margin-bottom: 26px; }
    .ff-heading h2 { font-size: 28px; line-height: 1.3; }
    .ff-heading span { font-size: 13px; line-height: 1.7; }
    .ff-product { display: grid; grid-template-columns: 105px 1fr; gap: 13px; padding: 12px; align-items: center; }
    .ff-product img { height: 112px; }
    .ff-product div { padding: 0; }
    .ff-product small { font-size: 10px; }
    .ff-product h3 { font-size: 18px; margin: 3px 0; }
    .ff-product p { font-size: 12px; line-height: 1.6; margin-bottom: 6px; }
    .ff-product b { font-size: 11px; }
    .ff-more { display: grid; gap: 9px; margin-top: 17px; }
    .ff-more a { padding: 11px 13px; border: 1px solid var(--ff-line); font-size: 12px; }
    .ff-split { gap: 28px; }
    .ff-lead { font-size: 14px; }
    .ff-steps { margin: 18px 0; }
    .ff-steps div { gap: 12px; padding: 12px 0; font-size: 13px; }
    .ff-image-card img { height: 230px; }
    .ff-trace { padding: 58px 0; }
    .ff-trace .wrap { gap: 28px; }
    .ff-trace-copy p:not(.ff-label) { font-size: 14px; line-height: 1.8; }
    .ff-trace-flow { grid-template-columns: 1fr 1fr; gap: 10px; }
    .ff-trace-flow div { padding: 14px 11px; min-height: 110px; }
    .ff-trace-flow strong { font-size: 13px; }
    .ff-trace-flow span { font-size: 11px; line-height: 1.55; }
    .ff-content-grid { gap: 22px; }
    .ff-content-main div { padding: 21px 18px; }
    .ff-content-main h3 { font-size: 21px; }
    .ff-articles a { padding: 13px 0; }
    .ff-articles b { font-size: 14px; }
    .ff-cta .wrap { padding-top: 35px; padding-bottom: 35px; }
    .ff-cta .ff-btn { width: 100%; }
    .ff-phone { font-size: 21px; }
    .mobile-contact-bar { position: fixed; z-index: 1100; left: 0; right: 0; bottom: 0; display: grid; grid-template-columns: 1fr 1fr; height: 62px; box-shadow: 0 -6px 20px rgba(7,27,74,.15); }
    .mobile-contact-bar a { display: flex; align-items: center; justify-content: center; gap: 6px; color: #fff; font-size: 13px; font-weight: 800; }
    .mobile-contact-bar a:first-child { background: var(--ff-navy); }
    .mobile-contact-bar a:last-child { background: var(--ff-red); }
}
@media (min-width: 769px) { .mobile-contact-bar { display: none; } }