* { box-sizing: border-box; margin: 0; padding: 0; }
body { background-color: #fafafa; color: #2d3748; font-family: "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif; line-height: 1.6; overflow-x: hidden; width: 100%; }
a { color: inherit; text-decoration: none; transition: all 0.25s ease; }
a:hover { color: #eb5a28; }
.natcontainer { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 15px; }
.natnavbar { background-color: #ffffff; border-bottom: 1px solid #edf2f7; position: relative; z-index: 1000; box-shadow: 0 2px 8px rgba(0,0,0,0.03); }
.natnavinner { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.natlogo { display: flex; align-items: center; }
.natlogo img { height: 38px; width: auto; max-width: 160px; object-fit: contain; }
.natmenu { display: flex; align-items: center; list-style: none; }
.natmenu li { margin: 0 6px; }
.natmenu li a { font-size: 14px; font-weight: 600; color: #4a5568; padding: 8px 14px; display: inline-block; border-radius: 4px; }
.natmenu li a:hover, .natmenu li.active a { background-color: #eb5a28; color: #ffffff; }
.natnotice { background: #ffffff; border: 1px solid #e2e8f0; border-left: 4px solid #eb5a28; padding: 12px 18px; border-radius: 4px; margin: 20px 0; font-size: 14px; color: #4a5568; display: flex; align-items: center; }
.natnotice i { color: #eb5a28; margin-right: 8px; font-size: 16px; }
.natbadgeauto { display: inline-block; padding: 2px 8px; font-size: 11px; color: #ffffff; background: #eb5a28; font-weight: bold; border-radius: 3px; }
.natbadgemanual { display: inline-block; padding: 2px 8px; font-size: 11px; color: #ffffff; background: #718096; font-weight: bold; border-radius: 3px; }
.natgridfeature { display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; margin-bottom: 25px; }
.natfeaturecard { background: #ffffff; border: 1px solid #edf2f7; border-radius: 6px; padding: 18px; display: flex; align-items: center; gap: 15px; transition: all 0.3s; }
.natfeaturecard:hover { border-color: #eb5a28; box-shadow: 0 4px 15px rgba(235, 90, 40, 0.08); }
.natfeatureimg { width: 55px; height: 55px; border-radius: 6px; background: #fff5f2; flex-shrink: 0; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.natfeatureimg img { max-width: 80%; max-height: 80%; object-fit: contain; }
.natfeatureinfo { flex: 1; min-width: 0; }
.natfeaturetitle { font-size: 14px; font-weight: 600; color: #2d3748; margin-bottom: 4px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.natfeatureprice { font-size: 16px; font-weight: 700; color: #eb5a28; }
.natgridthree { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 25px; }
.natportraitcard { background: #ffffff; border: 1px solid #edf2f7; border-radius: 6px; overflow: hidden; display: flex; flex-direction: column; transition: all 0.3s; }
.natportraitcard:hover { border-color: #eb5a28; transform: translateY(-3px); box-shadow: 0 6px 18px rgba(0,0,0,0.06); }
.natportraitimg { width: 100%; height: 160px; background: #f7fafc; display: flex; align-items: center; justify-content: center; position: relative; }
.natportraitimg img { max-width: 100%; max-height: 100%; object-fit: contain; }
.natfloatingprice { position: absolute; bottom: 10px; left: 10px; background: rgba(255,255,255,0.95); padding: 2px 10px; border-radius: 3px; font-size: 14px; font-weight: 700; color: #eb5a28; box-shadow: 0 2px 6px rgba(0,0,0,0.1); }
.natportraitbody { padding: 15px; flex: 1; display: flex; flex-direction: column; justify-content: space-between; }
.natportraittitle { font-size: 14px; font-weight: 600; color: #2d3748; margin-bottom: 10px; height: 38px; overflow: hidden; }
.natbtnorange { display: block; width: 100%; padding: 7px 0; background: #eb5a28; color: #ffffff; font-size: 13px; font-weight: 700; text-align: center; border-radius: 4px; }
.natbtnorange:hover { background: #d44717; color: #ffffff; }
.natbannerwrap { background: #ffffff; border: 1px solid #edf2f7; border-left: 5px solid #eb5a28; border-radius: 6px; padding: 25px 30px; margin-bottom: 25px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.natbannerimg { width: 110px; height: 100px; background: #f7fafc; border-radius: 6px; padding: 8px; flex-shrink: 0; display: flex; align-items: center; justify-content: center; }
.natbannerimg img { max-width: 100%; max-height: 100%; object-fit: contain; }
.natbannerinfo { flex: 1; min-width: 0; }
.natbannertitle { font-size: 18px; font-weight: 700; color: #2d3748; margin-bottom: 6px; }
.natbannerprice { font-size: 26px; font-weight: 800; color: #eb5a28; }
.natsplitrow { display: flex; gap: 20px; margin-bottom: 25px; }
.natsplitleft { width: 45%; }
.natsplitright { width: 55%; }
.natbigfocuscard { background: #ffffff; border: 1px solid #edf2f7; border-radius: 6px; padding: 25px; height: 100%; display: flex; flex-direction: column; justify-content: space-between; align-items: center; text-align: center; }
.natbigfocuscard:hover { border-color: #eb5a28; }
.natbigfocusimg { width: 100%; height: 180px; margin-bottom: 12px; display: flex; align-items: center; justify-content: center; }
.natbigfocusimg img { max-width: 100%; max-height: 100%; object-fit: contain; }
.natbigfocustitle { font-size: 17px; font-weight: 700; color: #2d3748; margin-bottom: 8px; }
.natbigfocusprice { font-size: 24px; font-weight: 800; color: #eb5a28; margin-bottom: 12px; }
.natcirclegrid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 25px; }
.natcirclecard { background: #ffffff; border: 1px solid #edf2f7; border-radius: 6px; padding: 20px 15px; text-align: center; display: flex; flex-direction: column; align-items: center; justify-content: space-between; }
.natcirclecard:hover { border-color: #eb5a28; }
.natcircleimg { width: 80px; height: 80px; border-radius: 50%; background: #fff5f2; margin-bottom: 10px; display: flex; align-items: center; justify-content: center; overflow: hidden; border: 2px solid #fed7cc; }
.natcircleimg img { max-width: 80%; max-height: 80%; object-fit: contain; }
.natcircletitle { font-size: 13px; font-weight: 600; color: #2d3748; margin-bottom: 6px; width: 100%; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.natcircleprice { font-size: 16px; font-weight: 700; color: #eb5a28; margin-bottom: 8px; }
.natmediarow { display: flex; gap: 20px; margin-bottom: 25px; }
.natmedialeft { width: 50%; }
.natmediaright { width: 50%; display: flex; flex-direction: column; gap: 15px; }
.nathorizontalcard { background: #ffffff; border: 1px solid #edf2f7; border-radius: 6px; padding: 15px; display: flex; align-items: center; gap: 15px; height: calc(50% - 7.5px); }
.nathorizontalcard:hover { border-color: #eb5a28; }
.nathorizontalimg { width: 80px; height: 80px; background: #f7fafc; border-radius: 4px; flex-shrink: 0; display: flex; align-items: center; justify-content: center; }
.nathorizontalimg img { max-width: 100%; max-height: 100%; object-fit: contain; }
.nathorizontalinfo { flex: 1; min-width: 0; }
.nathorizontaltitle { font-size: 14px; font-weight: 600; color: #2d3748; margin-bottom: 6px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.nathorizontalprice { font-size: 16px; font-weight: 700; color: #eb5a28; }
.natdensebox { background: #ffffff; border: 1px solid #edf2f7; border-radius: 6px; padding: 20px; margin-bottom: 35px; }
.natdenselist { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px 20px; }
.natdenseitem { display: flex; align-items: center; justify-content: space-between; padding: 10px 14px; background: #f7fafc; border: 1px solid #edf2f7; border-radius: 4px; }
.natdenseitem:hover { border-color: #eb5a28; background: #ffffff; }
.natdenseleft { display: flex; align-items: center; gap: 10px; min-width: 0; flex: 1; }
.natdenseleft img { width: 34px; height: 34px; object-fit: contain; flex-shrink: 0; background: #fff; border: 1px solid #e2e8f0; border-radius: 4px; }
.natdensetitle { font-size: 13px; font-weight: 600; color: #2d3748; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.natdenseright { display: flex; align-items: center; gap: 12px; flex-shrink: 0; margin-left: 10px; }
.natdenseprice { font-size: 15px; font-weight: 700; color: #eb5a28; }
.natdensebtn { padding: 4px 12px; background: #eb5a28; color: #ffffff; font-size: 12px; font-weight: 600; border-radius: 3px; }
.natdensebtn:hover { background: #d44717; color: #ffffff; }
.natfooter { background: #262c35; color: #a0aec0; border-top: 3px solid #eb5a28; padding: 30px 0; margin-top: 40px; text-align: center; }
.natfooterlinks { margin-bottom: 10px; }
.natfooterlinks a { font-size: 14px; color: #e2e8f0; margin: 0 10px; }
.natfooterlinks a:hover { color: #eb5a28; }
.natfootercopy { font-size: 13px; color: #718096; }
.natdetailwrap { background: #ffffff; border: 1px solid #edf2f7; border-radius: 6px; padding: 30px; margin: 25px 0; }
.natdetailrow { display: flex; gap: 35px; margin-bottom: 30px; }
.natdetailleft { width: 40%; }
.natdetailimgbox { width: 100%; height: 300px; background: #f7fafc; border: 1px solid #edf2f7; border-radius: 6px; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.natdetailimgbox img { max-width: 90%; max-height: 90%; object-fit: contain; }
.natdetailright { width: 60%; }
.natdetailtitle { font-size: 20px; font-weight: 700; color: #2d3748; margin-bottom: 12px; }
.natdetailpricebox { background: #fff5f2; border: 1px solid #fed7cc; border-left: 4px solid #eb5a28; border-radius: 4px; padding: 15px 20px; margin-bottom: 20px; display: flex; align-items: baseline; justify-content: space-between; }
.natdetailprice { font-size: 26px; font-weight: 800; color: #eb5a28; }
.natdetailstock { font-size: 13px; color: #718096; }
.natdetailform { margin-top: 15px; }
.natdetailitem { margin-bottom: 16px; }
.natdetaillabel { font-size: 13px; font-weight: 700; color: #4a5568; margin-bottom: 5px; display: block; }
.natdetailinput { width: 100%; height: 40px; border: 1px solid #cbd5e0; border-radius: 4px; padding: 0 12px; font-size: 14px; color: #2d3748; outline: none; background: #ffffff; }
.natdetailinput:focus { border-color: #eb5a28; }
.natdetailbtn { width: 100%; height: 45px; background: #eb5a28; color: #ffffff; font-size: 16px; font-weight: 700; border: none; border-radius: 4px; cursor: pointer; margin-top: 10px; }
.natdetailbtn:hover { background: #d44717; }
.natdetailtabhead { border-bottom: 2px solid #edf2f7; display: flex; margin-bottom: 20px; }
.natdetailtabtitle { font-size: 15px; font-weight: 700; color: #ffffff; background: #eb5a28; padding: 8px 18px; border-radius: 4px 4px 0 0; }
.natdetailcontent { font-size: 14px; color: #4a5568; line-height: 1.8; }
.natquerywrap { background: #ffffff; border: 1px solid #edf2f7; border-top: 3px solid #eb5a28; border-radius: 6px; padding: 30px; margin: 25px auto; max-width: 650px; }
.natquerytitle { font-size: 18px; font-weight: 700; color: #2d3748; text-align: center; margin-bottom: 20px; }
.natquerytabs { display: flex; justify-content: center; gap: 10px; margin-bottom: 25px; border-bottom: 1px solid #edf2f7; padding-bottom: 12px; }
.natquerytabitem { font-size: 13px; font-weight: 700; color: #718096; padding: 6px 14px; background: #f7fafc; border-radius: 4px; }
.natquerytabitem.active, .natquerytabitem:hover { color: #ffffff; background: #eb5a28; }
.natqueryitem { margin-bottom: 18px; }
.natquerylabel { font-size: 13px; color: #4a5568; margin-bottom: 6px; display: block; font-weight: 700; }
.natqueryinput { width: 100%; height: 42px; border: 1px solid #cbd5e0; border-radius: 4px; padding: 0 12px; font-size: 14px; outline: none; background: #ffffff; color: #2d3748; }
.natqueryinput:focus { border-color: #eb5a28; }
.natquerybtn { width: 100%; height: 44px; background: #eb5a28; color: #ffffff; border: none; border-radius: 4px; font-size: 15px; font-weight: 700; cursor: pointer; }
.natquerybtn:hover { background: #d44717; }
@media (max-width: 991px) {
    .natgridfeature, .natgridthree, .natcirclegrid { grid-template-columns: repeat(2, 1fr); }
    .natsplitrow, .natmediarow { flex-direction: column; }
    .natsplitleft, .natsplitright, .natmedialeft, .natmediaright { width: 100%; }
    .nathorizontalcard { height: auto; }
    .natdetailrow { flex-direction: column; }
    .natdetailleft, .natdetailright { width: 100%; }
    .natdenselist { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
    .natgridfeature, .natgridthree, .natcirclegrid { grid-template-columns: 1fr; }
    .natnavinner { flex-direction: column; height: auto; padding: 12px 0; gap: 8px; }
    .natmenu { flex-wrap: wrap; justify-content: center; }
    .natbannerwrap { flex-direction: column; text-align: center; }
}