:root {
    --bh-bg: #f3f4f6;
    --bh-surface: #ffffff;
    --bh-border: #0f172a;
    --bh-blue: #1d4ed8;
    --bh-red: #dc2626;
    --bh-yellow: #eab308;
    --bh-text: #0f172a;
    --bh-text-sub: #4b5563;
    --bh-shadow: 4px 4px 0px #0f172a;
    --bh-shadow-hover: 7px 7px 0px #1d4ed8;
    --bh-radius: 0px;
}
body { margin: 0; background-color: var(--bh-bg); color: var(--bh-text); font-family: "Helvetica Neue", Arial, "PingFang SC", sans-serif; -webkit-font-smoothing: antialiased; }
.bh-header { background-color: var(--bh-surface); border-bottom: 3px solid var(--bh-border); padding: 22px 0; }
.bh-nav-inner { max-width: 1400px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; padding: 0 24px; box-sizing: border-box; }
.bh-logo img { height: 26px; filter: grayscale(1) contrast(2) brightness(0.9); }
.bh-menu { display: flex; gap: 35px; }
.bh-menu a { text-decoration: none; color: var(--bh-text-sub); font-weight: 800; font-size: 14px; text-transform: uppercase; transition: 0.3s; }
.bh-menu a:hover { color: var(--bh-red); }
.bh-container { max-width: 1400px; margin: 40px auto; padding: 0 24px; box-sizing: border-box; }
.bh-notice { background: var(--bh-surface); border: 2px solid var(--bh-border); padding: 18px 24px; box-shadow: var(--bh-shadow); font-size: 13px; color: var(--bh-text); line-height: 1.6; display: flex; align-items: center; gap: 12px; position: relative; }
.bh-notice::after { content: "SYS_MSG"; position: absolute; top: -10px; left: 15px; background: var(--bh-red); color: #fff; font-size: 9px; padding: 1px 6px; font-weight: bold; border: 1px solid var(--bh-border); }
.bh-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 16px; }
.bh-card { background-color: var(--bh-surface); border: 2px solid var(--bh-border); border-radius: var(--bh-radius); padding: 16px; text-decoration: none; transition: all 0.2s ease-in-out; box-shadow: var(--bh-shadow); display: flex; flex-direction: column; position: relative; }
.bh-card:hover { transform: translate(-3px, -3px); border-color: var(--bh-border); box-shadow: var(--bh-shadow-hover); }
.bh-img-box { width: 100%; aspect-ratio: 1; background: #fafafa; border-radius: 0px; display: flex; align-items: center; justify-content: center; margin-bottom: 12px; border: 1px solid var(--bh-border); }
.bh-img-box img { width: 65%; height: 65%; object-fit: contain; opacity: 0.9; transition: 0.2s; }
.bh-card:hover .bh-img-box img { opacity: 1; transform: scale(1.04); }
.bh-name { font-size: 13px; font-weight: 800; color: var(--bh-text); height: 38px; line-height: 1.4; overflow: hidden; margin-bottom: 12px; }
.bh-meta { display: flex; justify-content: space-between; align-items: center; margin-top: auto; border-top: 2px solid var(--bh-border); padding-top: 10px; }
.bh-price { color: var(--bh-red); font-weight: 900; font-size: 16px; }
.bh-sell { font-size: 11px; color: var(--bh-text-sub); font-weight: bold; }
.bh-tag { position: absolute; top: 12px; left: 12px; background: var(--bh-yellow); color: var(--bh-text); font-size: 9px; padding: 2px 6px; border-radius: 0px; font-weight: bold; border: 1px solid var(--bh-border); }
.bh-detail-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 32px; }
.bh-box { background: var(--bh-surface); border: 2px solid var(--bh-border); padding: 40px; box-shadow: var(--bh-shadow); }
.bh-h1 { font-size: 24px; font-weight: 800; margin: 0 0 20px 0; color: var(--bh-text); border-bottom: 2px solid var(--bh-border); padding-bottom: 12px; }
.bh-input { width: 100%; height: 46px; background: var(--bh-bg); border: 2px solid var(--bh-border); border-radius: 0px; padding: 0 15px; font-size: 14px; box-sizing: border-box; outline: none; transition: 0.2s; margin-top: 8px; color: var(--bh-text); font-weight: bold; }
.bh-input:focus { border-color: var(--bh-blue); background: var(--bh-surface); }
.bh-label { display: block; font-size: 12px; font-weight: 800; color: var(--bh-text-sub); text-transform: uppercase; }
.bh-btn { width: 100%; height: 50px; background: var(--bh-blue); color: #fff; border: 2px solid var(--bh-border); border-radius: 0px; font-size: 15px; font-weight: 900; cursor: pointer; transition: 0.2s; margin-top: 20px; box-shadow: 4px 4px 0px var(--bh-border); }
.bh-btn:hover { background: var(--bh-red); transform: translate(-2px, -2px); box-shadow: 6px 6px 0px var(--bh-border); }
.bh-footer { background: var(--bh-surface); border-top: 3px solid var(--bh-border); padding: 50px 0; margin-top: 80px; text-align: center; }
@media (max-width: 1400px) { .bh-grid { grid-template-columns: repeat(5, 1fr); } }
@media (max-width: 1000px) { .bh-grid { grid-template-columns: repeat(3, 1fr); } .bh-detail-grid { grid-template-columns: 1fr; } }
@media (max-width: 600px) { .bh-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; } }