html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    overflow-x: hidden;
    background: #f7fafc;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: #2d3748;
    font-size: 13px;
}

* {
    box-sizing: border-box;
}

a {
    color: #2d3748;
    text-decoration: none;
}

.backheader {
    background: #c51e1e;
    border-bottom: 3px solid #9e1313;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.backheaderinner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 10px 15px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.backlogo img {
    max-height: 40px;
    vertical-align: middle;
}

.backnav {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 15px;
}

.backnav a {
    font-weight: bold;
    color: #ffffff;
    padding: 6px 12px;
    border-radius: 4px;
    transition: background 0.2s;
}

.backnav a:hover, .backnav .active {
    background: #9e1313;
}

.backwrap {
    max-width: 1200px;
    margin: 15px auto;
    padding: 0 10px;
}

.backcard {
    background: #ffffff;
    border-radius: 6px;
    border: 1px solid #e2e8f0;
    padding: 15px;
    margin-bottom: 15px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.02);
}

.backcardtitle {
    font-size: 15px;
    font-weight: bold;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 2px solid #c51e1e;
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: #9e1313;
}

.backimg {
    max-width: 44px;
    max-height: 44px;
    object-fit: contain;
    border-radius: 4px;
}

.backgrid5 {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 12px;
}

.backgriditem {
    background: #ffffff;
    border: 1px solid #edf2f7;
    border-radius: 6px;
    padding: 12px;
    text-align: center;
    transition: all 0.2s;
}

.backgriditem:hover {
    transform: translateY(-2px);
    border-color: #c51e1e;
    box-shadow: 0 4px 12px rgba(197,30,30,0.1);
}

.backgriditemtitle {
    font-size: 12px;
    font-weight: bold;
    margin: 6px 0 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.backprice {
    color: #e53e3e;
    font-weight: bold;
}

.backbtn {
    display: inline-block;
    background: #c51e1e;
    color: #ffffff;
    padding: 4px 10px;
    font-size: 11px;
    font-weight: bold;
    border-radius: 4px;
    border: none;
    cursor: pointer;
}

.backbtn:hover {
    background: #9e1313;
}

.backpill {
    display: inline-block;
    background: #f7fafc;
    color: #4a5568;
    border: 1px solid #e2e8f0;
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 11px;
    margin: 2px;
}

.backcircleicon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: #fff5f5;
    color: #c51e1e;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 8px;
    font-weight: bold;
}

.backfooter {
    background: #1a202c;
    color: #ffffff;
    padding: 25px 0;
    text-align: center;
    margin-top: 30px;
}

.backfooternav a {
    margin: 0 10px;
    color: #cbd5e0;
    font-size: 12px;
}

.backcopyright {
    color: #cbd5e0;
    font-size: 12px;
    margin-top: 10px;
}

@media (max-width: 992px) {
    .backgrid5 { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
    .backgrid5 { grid-template-columns: repeat(2, 1fr); }
    .backheaderinner { flex-direction: column; gap: 10px; }
}