.foot{
    width: 100%;
    min-height: 373px;
    background:#2B3F63;
}
.foot-background{
    width: 100%;
    min-height: 100%;
    background: url(../images/footer-background.png) no-repeat ;
    background-size: 100% 100%;
}
.foot-content{
    width: 100%;
    max-width: 1200px;
    height: 100%;
    margin: 0 auto;
    box-sizing: border-box;
    color: #fff;
}
.foot-content-top{
    padding:46px 0 30px 0;
    display: flex;
    justify-content: space-between;
    gap: 42px;
    border-bottom: 1px solid #797979;
}
/* ---- 4 列布局 ---- */
.f-col{ min-width: 0; }
.f-brand{ flex: 0 0 235px; }
.f-links{ flex: 0 0 118px; }
.f-countries{ flex: 1 1 auto; }
.f-contact{ flex: 0 0 250px; }

/* 列1：品牌 */
.f-logo{
    display: block;
    width: 158px;
    height: auto;
    filter: brightness(0) invert(1);
    opacity: .95;
}
.f-intro{
    margin-top: 18px;
    font-size: 13px;
    line-height: 1.9;
    color: rgba(255,255,255,.62);
    text-align: justify;
}

/* 列标题 */
.f-title{
    font-size: 14px;
    font-weight: 600;
    color: #fff;
    margin-bottom: 14px;
}

/* 列2：产品与服务 */
.f-links a{
    display: block;
    font-size: 13px;
    line-height: 30px;
    color: rgba(255,255,255,.75);
    text-decoration: none;
    transition: color .2s ease;
}
.f-links a:hover{
    color: #89bdff;
}

/* 列3：热门国家 */
.f-country-grid{
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    column-gap: 22px;
}
.f-country-grid a{
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    line-height: 28px;
    color: rgba(255,255,255,.75);
    text-decoration: none;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: color .2s ease;
}
.f-country-grid a:hover{
    color: #89bdff;
}
.f-country-grid a img{
    flex: 0 0 auto;
    width: 18px;
    height: 13px;
    object-fit: cover;
    border-radius: 2px;
    border: 1px solid rgba(255,255,255,.28);
    background: #fff;
}
.f-more{
    display: inline-block;
    margin-top: 12px;
    font-size: 12px;
    color: #89bdff;
    text-decoration: none;
    transition: opacity .2s ease;
}
.f-more:hover{
    opacity: .8;
}

/* 列4：联系方式 */
.f-contact .f-line{
    display: block;
    font-size: 13px;
    line-height: 26px;
    color: rgba(255,255,255,.75);
    text-decoration: none;
    transition: color .2s ease;
}
.f-contact .f-line:hover{
    color: #89bdff;
}
.f-qr-list{
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    margin-top: 16px;
}
.f-qr-item{
    min-width: 0;
    text-align: center;
}
.f-qr-item img{
    display: block;
    width: 82px;
    height: 82px;
    margin: 0 auto 8px;
    padding: 5px;
    background: #fff;
    border-radius: 8px;
    box-sizing: border-box;
    object-fit: contain;
}
.f-qr-item span{
    display: block;
    font-size: 11px;
    color: rgba(255,255,255,.72);
    line-height: 1.5;
    white-space: nowrap;
}

/* 底栏 */
.foot-content-bottom{
    font-size: 13px;
    text-align: center;
    line-height: 60px;
}
.foot-content-bottom .f-sep{
    margin: 0 12px;
    color: rgba(255,255,255,.35);
}
.foot-content-bottom a{
    color: #fff;
}

/* 移动端适配：页脚纵向堆叠 */
@media (max-width: 768px){
  .foot-content{ padding: 0 15px; }
  .foot-content-top{ flex-wrap: wrap; gap: 28px; padding: 36px 0 26px; }
  .f-brand{ flex: 1 1 100%; }
  .f-links{ flex: 1 1 40%; }
  .f-countries{ flex: 1 1 100%; }
  .f-contact{ flex: 1 1 100%; }
  .f-country-grid{ grid-template-columns: repeat(3, 1fr); column-gap: 12px; }
}
@media (max-width: 480px){
  .f-country-grid{ grid-template-columns: repeat(2, 1fr); }
  .f-qr-list{ max-width: 250px; }
}