* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif; background: #f0f2f5; color: #333; line-height: 1.6; }
a { color: #1677ff; text-decoration: none; }
.header { background: #001529; color: #fff; padding: 0 24px; height: 56px; display: flex; align-items: center; justify-content: space-between; }
.header .logo { font-size: 18px; font-weight: 600; }
.header nav a { color: rgba(255,255,255,.85); margin-left: 20px; font-size: 14px; }
.header nav a:hover { color: #fff; }
.container { max-width: 1100px; margin: 24px auto; padding: 0 16px; }
.card { background: #fff; border-radius: 8px; padding: 24px; margin-bottom: 16px; box-shadow: 0 1px 3px rgba(0,0,0,.08); }
.card h2 { font-size: 18px; margin-bottom: 16px; border-bottom: 1px solid #f0f0f0; padding-bottom: 12px; }
.btn { display: inline-block; padding: 8px 20px; border-radius: 6px; border: none; cursor: pointer; font-size: 14px; }
.btn-primary { background: #1677ff; color: #fff; }
.btn-primary:hover { background: #4096ff; }
.btn-danger { background: #ff4d4f; color: #fff; }
.btn-sm { padding: 4px 12px; font-size: 12px; }
input, select { padding: 8px 12px; border: 1px solid #d9d9d9; border-radius: 6px; width: 100%; margin-bottom: 12px; font-size: 14px; }
label { display: block; margin-bottom: 4px; font-size: 13px; color: #666; }
.form-row { margin-bottom: 8px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.product-card { border: 1px solid #f0f0f0; border-radius: 8px; padding: 20px; transition: box-shadow .2s; }
.product-card:hover { box-shadow: 0 4px 12px rgba(0,0,0,.1); }
.product-card .price { font-size: 28px; color: #ff4d4f; font-weight: 700; margin: 12px 0; }
.product-card .price span { font-size: 14px; color: #999; }
.product-card .spec { font-size: 13px; color: #666; line-height: 2; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 24px; }
.stat-item { background: #fff; border-radius: 8px; padding: 20px; text-align: center; box-shadow: 0 1px 3px rgba(0,0,0,.08); }
.stat-item .num { font-size: 28px; font-weight: 700; color: #1677ff; }
.stat-item .label { font-size: 13px; color: #999; margin-top: 4px; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 10px 12px; text-align: left; border-bottom: 1px solid #f0f0f0; }
th { background: #fafafa; font-weight: 600; }
.tag { display: inline-block; padding: 2px 8px; border-radius: 4px; font-size: 12px; }
.tag-green { background: #f6ffed; color: #52c41a; }
.tag-orange { background: #fff7e6; color: #fa8c16; }
.tag-red { background: #fff2f0; color: #ff4d4f; }
.tag-blue { background: #e6f4ff; color: #1677ff; }
.hero { background: linear-gradient(135deg, #1677ff 0%, #0958d9 100%); color: #fff; padding: 48px 24px; border-radius: 8px; margin-bottom: 24px; text-align: center; }
.hero h1 { font-size: 32px; margin-bottom: 12px; }
.hero p { opacity: .85; font-size: 16px; }
.login-box { max-width: 400px; margin: 60px auto; }
.msg { padding: 10px 14px; border-radius: 6px; margin-bottom: 12px; font-size: 14px; }
.msg-error { background: #fff2f0; color: #ff4d4f; border: 1px solid #ffccc7; }
.msg-ok { background: #f6ffed; color: #52c41a; border: 1px solid #b7eb8f; }
.footer { text-align: center; padding: 24px; color: #999; font-size: 13px; }
@media (max-width: 768px) { .stats { grid-template-columns: repeat(2, 1fr); } }