/* ============ 前牛 QIANNIU 官网 · 白色科技风 ============ */
:root{
  --bg:#ffffff; --bg2:#f5f7fb; --card:#ffffff; --card2:#f8fafd;
  --txt:#141a26; --sub:#5b6577; --line:rgba(20,26,38,.09);
  --red:#e8353f; --red2:#ff5a63; --green:#0ab26f;
  --radius:14px;
  --shadow:0 2px 16px rgba(23,43,99,.07);
  --shadow-hi:0 14px 40px rgba(23,43,99,.13);
}
*{margin:0;padding:0;box-sizing:border-box;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;}
html{scroll-behavior:smooth;overflow-x:hidden;}
body{background:var(--bg);color:var(--txt);line-height:1.6;overflow-x:hidden;}
img{max-width:100%;}
.container{max-width:1180px;margin:0 auto;padding:0 24px;}
.sec-title{font-size:34px;text-align:center;letter-spacing:1px;color:var(--txt);}
.sec-sub{text-align:center;color:var(--sub);margin:10px 0 46px;font-size:15px;}

/* ===== 导航 ===== */
.header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.82);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line);}
.nav-wrap{display:flex;justify-content:space-between;align-items:center;height:68px;}
.logo img{height:46px;display:block;}
.nav{display:flex;gap:30px;align-items:center;}
.nav a{color:var(--sub);text-decoration:none;font-size:15px;transition:color .2s;}
.nav a:hover{color:var(--red);}
.nav-cta{color:#fff !important;background:linear-gradient(135deg,var(--red),#ff7a45);padding:9px 22px;border-radius:99px;font-weight:600;box-shadow:0 4px 18px rgba(232,53,63,.32);}
.menu-btn{display:none;background:none;border:0;cursor:pointer;padding:8px;}
.menu-btn span{display:block;width:22px;height:2px;background:var(--txt);margin:5px 0;border-radius:2px;transition:.3s;}

/* ===== Hero ===== */
.hero{padding:90px 0 70px;background:
  radial-gradient(700px 380px at 82% 15%,rgba(232,53,63,.09),transparent 65%),
  radial-gradient(600px 420px at 6% 88%,rgba(28,100,242,.07),transparent 60%),
  linear-gradient(180deg,#ffffff 0%,#f7f9fd 100%);}
.hero-wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;}
.hero-tag{display:inline-block;font-size:13px;letter-spacing:2px;color:var(--red);border:1px solid rgba(232,53,63,.35);background:rgba(232,53,63,.05);border-radius:99px;padding:6px 16px;margin-bottom:22px;}
.hero h1{font-size:56px;line-height:1.15;letter-spacing:2px;color:var(--txt);}
.grad{background:linear-gradient(120deg,var(--red),#ff7a45);-webkit-background-clip:text;background-clip:text;color:transparent;}
.hero p{color:var(--sub);font-size:17px;margin:22px 0 30px;}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap;}
.btn{display:inline-block;padding:13px 30px;border-radius:99px;text-decoration:none;font-size:16px;font-weight:600;transition:transform .2s,box-shadow .2s;}
.btn:hover{transform:translateY(-2px);}
.btn-primary{color:#fff;background:linear-gradient(135deg,var(--red),#ff7a45);box-shadow:0 6px 24px rgba(232,53,63,.35);}
.btn-ghost{color:var(--txt);border:1px solid rgba(20,26,38,.16);background:#fff;}
.btn-ghost:hover{border-color:var(--red);color:var(--red);}
.hero-stats{display:flex;gap:40px;margin-top:40px;}
.hero-stats b{font-size:30px;display:block;background:linear-gradient(120deg,var(--txt),#41506b);-webkit-background-clip:text;background-clip:text;color:transparent;}
.hero-stats span{font-size:13px;color:var(--sub);}
.hero-img{position:relative;}
.hero-img img{border-radius:var(--radius);box-shadow:0 30px 70px rgba(23,43,99,.22);position:relative;z-index:1;width:100%;}
.hero-glow{position:absolute;inset:-6%;background:radial-gradient(closest-side,rgba(232,53,63,.16),transparent);filter:blur(34px);z-index:0;}

/* ===== 特性 ===== */
.feature-section{padding:90px 0;background:var(--bg2);}
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.f-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s;}
.f-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hi);}
.f-ico{font-size:30px;margin-bottom:14px;}
.f-card h3{font-size:18px;margin-bottom:8px;color:var(--txt);}
.f-card p{color:var(--sub);font-size:14px;}

/* ===== 版本 ===== */
.version-section{padding:90px 0;background:var(--bg);}
.version-wrap{display:grid;grid-template-columns:1fr 1fr;gap:28px;max-width:900px;margin:0 auto;}
.version-card{background:var(--card);border:1px solid var(--line);border-radius:16px;overflow:hidden;text-align:center;box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s;}
.version-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hi);}
.version-img img{width:100%;height:260px;object-fit:cover;display:block;}
.version-card h3{font-size:22px;margin:20px 0 6px;color:var(--txt);}
.version-card p{color:var(--sub);font-size:14px;padding:0 24px 24px;}

/* ===== 实拍画廊 ===== */
.gallery-section{padding:90px 0;background:var(--bg2);}
.gallery-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;}
.g-item{margin:0;background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden;cursor:zoom-in;box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s;}
.g-item:hover{transform:translateY(-4px);box-shadow:var(--shadow-hi);}
.g-item img{display:block;width:100%;height:180px;object-fit:cover;}
.g-item figcaption{padding:9px 12px;font-size:13px;color:var(--sub);text-align:center;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}

/* ===== 下单 ===== */
.order-section{padding:90px 0;background:
  radial-gradient(600px 300px at 50% 0%,rgba(232,53,63,.07),transparent 70%),var(--bg);}
.order-wrap{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center;max-width:960px;}
.order-intro .sec-title{text-align:left;}
.order-intro p{color:var(--sub);margin-top:12px;}
.order-form{display:flex;flex-direction:column;gap:14px;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:30px;box-shadow:var(--shadow-hi);}
.order-form input,.order-form select,.order-form textarea{background:var(--card2);border:1px solid rgba(20,26,38,.12);border-radius:10px;padding:13px 16px;color:var(--txt);font-size:15px;outline:none;transition:border-color .2s;width:100%;}
.order-form input:focus,.order-form select:focus,.order-form textarea:focus{border-color:var(--red2);}
.order-form select option{background:#fff;color:var(--txt);}
.btn-block{width:100%;border:0;cursor:pointer;font-size:16px;}
#orderTip{min-height:22px;font-size:14px;}

/* ===== 页脚 ===== */
.footer{padding:50px 0 40px;text-align:center;background:#f2f5fa;border-top:1px solid var(--line);}
.footer img{height:52px;margin-bottom:14px;}
.footer p{color:var(--sub);font-size:14px;}
.beian{margin-top:10px;font-size:13px;}
.beian a{color:#7a8499;text-decoration:none;}
.beian a:hover{color:var(--red);text-decoration:underline;}
.beian .sep{margin:0 8px;color:#c3cad8;}

/* ===== 页脚公司信息与客服 ===== */
.footer-contact{margin:18px 0 20px;}
.kf-btn{display:inline-flex;align-items:center;gap:8px;padding:11px 28px;border-radius:99px;
  color:#fff;text-decoration:none;font-size:15px;font-weight:600;
  background:linear-gradient(135deg,#0ab26f,#22c58b);box-shadow:0 4px 18px rgba(10,178,111,.3);
  transition:transform .2s,box-shadow .2s;}
.kf-btn:hover{transform:translateY(-2px);box-shadow:0 8px 26px rgba(10,178,111,.42);}
.kf-ico{font-size:17px;}
.company-info{margin-top:4px;color:var(--sub);font-size:13px;line-height:1.9;}
.company-info .co-name{color:var(--txt);font-size:14px;font-weight:600;}

/* ===== 预览层 ===== */
.img-viewer{display:none;position:fixed;inset:0;background:rgba(15,20,32,.88);z-index:9999;align-items:center;justify-content:center;cursor:zoom-out;}
.img-viewer.show{display:flex;}
.img-viewer img{max-width:92vw;max-height:90vh;border-radius:10px;}

/* ============ 移动端适配 ============ */
@media (max-width:960px){
  .hero-wrap{grid-template-columns:1fr;gap:40px;}
  .hero h1{font-size:40px;}
  .hero{padding:56px 0 50px;}
  .hero-img{max-width:560px;margin:0 auto;}
  .feature-grid{grid-template-columns:repeat(2,1fr);}
  .gallery-grid{grid-template-columns:repeat(3,1fr);}
  .order-wrap{grid-template-columns:1fr;gap:30px;}
  .order-intro .sec-title{text-align:center;}
  .order-intro p{text-align:center;}
  .sec-title{font-size:28px;}
  .menu-btn{display:block;}
  .nav{position:fixed;top:68px;right:0;width:min(72vw,300px);flex-direction:column;align-items:flex-start;gap:6px;background:#fff;border-left:1px solid var(--line);border-bottom:1px solid var(--line);border-radius:0 0 0 16px;padding:18px 24px 24px;transform:translateY(-12px);visibility:hidden;opacity:0;pointer-events:none;transition:transform .3s,visibility .3s,opacity .3s;box-shadow:-10px 20px 50px rgba(23,43,99,.18);}
  .nav.open{transform:translateX(0);visibility:visible;opacity:1;pointer-events:auto;}
  .nav a{width:100%;padding:12px 4px;font-size:16px;border-bottom:1px solid var(--line);color:var(--txt);}
  .nav a:last-child{border-bottom:0;}
  .nav-cta{text-align:center;margin-top:8px;}
}
@media (max-width:600px){
  .container{padding:0 18px;}
  .hero h1{font-size:32px;}
  .hero p{font-size:15px;}
  .hero-stats{gap:24px;}
  .hero-stats b{font-size:24px;}
  .feature-grid{grid-template-columns:1fr;}
  .version-wrap{grid-template-columns:1fr;}
  .gallery-grid{grid-template-columns:repeat(2,1fr);gap:10px;}
  .g-item img{height:130px;}
  .sec-title{font-size:24px;}
  .sec-sub{margin-bottom:30px;}
  .feature-section,.version-section,.gallery-section,.order-section{padding:60px 0;}
  .order-form{padding:22px 18px;}
  .logo img{height:40px;}
  .kf-btn{width:100%;justify-content:center;}
  .company-info{font-size:12px;}
}

/* ===== 后台登录页 ===== */
.login-body{min-height:100vh;display:flex;align-items:center;justify-content:center;background:
  radial-gradient(600px 320px at 80% 12%,rgba(232,53,63,.08),transparent 65%),var(--bg2);}
.login-box{width:min(400px,92vw);background:#fff;border:1px solid var(--line);border-radius:16px;
  padding:38px 34px;box-shadow:var(--shadow-hi);}
.login-box h2{text-align:center;margin-bottom:26px;font-size:22px;}
.login-box .form-item{margin-bottom:16px;}
.login-box label{display:block;font-size:13px;color:var(--sub);margin-bottom:6px;}
.login-box input{width:100%;background:var(--card2);border:1px solid rgba(20,26,38,.12);border-radius:10px;
  padding:12px 14px;font-size:15px;color:var(--txt);outline:none;transition:border-color .2s;}
.login-box input:focus{border-color:var(--red2);}
#loginTip{min-height:22px;font-size:14px;text-align:center;}
.login-box .btn-primary{width:100%;border:0;cursor:pointer;font-size:16px;
  color:#fff;background:linear-gradient(135deg,var(--red),#ff7a45);border-radius:99px;
  padding:13px;box-shadow:0 6px 24px rgba(232,53,63,.35);}

/* ===== 后台管理页 ===== */
.admin-body{min-height:100vh;background:var(--bg2);}
.admin-container{display:flex;width:100%;align-items:stretch;}
.admin-sidebar{width:220px;flex-shrink:0;background:#fff;border-right:1px solid var(--line);
  padding:24px 0;min-height:100vh;position:sticky;top:0;height:100vh;}
.admin-logo{padding:0 22px 22px;border-bottom:1px solid var(--line);margin-bottom:12px;}
.admin-logo img{max-height:44px;max-width:100%;}
.admin-menu{list-style:none;}
.admin-menu li{padding:13px 24px;font-size:15px;color:var(--sub);cursor:pointer;transition:.2s;border-left:3px solid transparent;}
.admin-menu li:hover{color:var(--txt);background:var(--card2);}
.admin-menu li.active{color:var(--red);background:rgba(232,53,63,.05);border-left-color:var(--red);font-weight:600;}
.admin-main{flex:1;padding:34px 38px;min-width:0;}
.admin-tab{display:none;background:#fff;border:1px solid var(--line);border-radius:16px;
  padding:28px 30px;box-shadow:var(--shadow);max-width:760px;}
.admin-tab.active{display:block;}
.admin-tab h2{font-size:19px;margin-bottom:20px;color:var(--txt);}
.admin-tab .form-item{margin-bottom:18px;}
.admin-tab label{display:block;font-size:13px;color:var(--sub);margin-bottom:6px;}
.admin-tab input{background:var(--card2);border:1px solid rgba(20,26,38,.12);border-radius:10px;
  padding:11px 14px;font-size:15px;color:var(--txt);outline:none;width:100%;max-width:340px;transition:border-color .2s;}
.admin-tab input:focus{border-color:var(--red2);}
.btn-save{border:0;cursor:pointer;color:#fff;font-size:15px;font-weight:600;
  background:linear-gradient(135deg,var(--red),#ff7a45);border-radius:99px;padding:11px 30px;
  box-shadow:0 4px 16px rgba(232,53,63,.3);}
.preview-box{margin:10px 0 16px;}
.preview-box img{max-height:120px;border-radius:8px;border:1px solid var(--line);}
#orderListBox table{width:100%;border-collapse:collapse;font-size:14px;}
#orderListBox th,#orderListBox td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left;color:var(--txt);}
#orderListBox th{color:var(--sub);font-weight:600;background:var(--card2);}
#pwdTip{min-height:22px;font-size:14px;}

@media (max-width:760px){
  .admin-container{flex-direction:column;}
  .admin-sidebar{width:100%;min-height:auto;height:auto;position:static;border-right:0;border-bottom:1px solid var(--line);padding:14px 0;}
  .admin-logo{padding:0 18px 12px;border-bottom:0;margin-bottom:0;}
  .admin-menu{display:flex;overflow-x:auto;}
  .admin-menu li{white-space:nowrap;border-left:0;border-bottom:3px solid transparent;}
  .admin-menu li.active{border-left:0;border-bottom-color:var(--red);}
  .admin-main{padding:20px 16px;}
  .admin-tab{padding:20px 16px;}
}

/* 锚点定位避开吸顶导航 */
section[id]{scroll-margin-top:82px;}

/* ===== 后台补充样式 ===== */
.admin-menu-bottom{margin-top:auto;border-top:1px solid var(--line);padding-top:8px;}
.admin-sidebar{display:flex;flex-direction:column;}
.admin-menu-bottom li{color:#8a93a6;font-size:14px;}
.admin-menu-bottom li:hover{color:var(--red);}
.btn-del{border:1px solid rgba(232,53,63,.35);background:rgba(232,53,63,.05);color:var(--red);
  border-radius:8px;padding:5px 14px;font-size:13px;cursor:pointer;transition:.2s;}
.btn-del:hover{background:var(--red);color:#fff;}
.order-table{width:100%;border-collapse:collapse;font-size:14px;}

/* ===== 后台补充样式 ===== */
.admin-menu-bottom{margin-top:auto;border-top:1px solid var(--line);padding-top:8px;}
.admin-sidebar{display:flex;flex-direction:column;}
.admin-menu-bottom li{color:#8a93a6;font-size:14px;}
.admin-menu-bottom li:hover{color:var(--red);}
.btn-del{border:1px solid rgba(232,53,63,.35);background:rgba(232,53,63,.05);color:var(--red);
  border-radius:8px;padding:5px 14px;font-size:13px;cursor:pointer;transition:.2s;}
.btn-del:hover{background:var(--red);color:#fff;}
.order-table{width:100%;border-collapse:collapse;font-size:14px;}

/* ===== 产品管理 & 图库管理 ===== */
.tab-note{font-size:13px;color:var(--sub);margin:-8px 0 16px;line-height:1.7;}
#product-manage{max-width:880px;}
.gallery-toolbar{display:flex;gap:12px;align-items:center;margin-bottom:18px;flex-wrap:wrap;}
.gallery-toolbar span{font-size:13px;color:var(--sub);}
.btn-secondary{background:#eef1f6 !important;color:var(--txt) !important;box-shadow:none !important;border:1px solid var(--line);}
.gallery-admin-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:14px;}
.ga-card{border:1px solid var(--line);border-radius:12px;padding:10px;background:var(--card2);cursor:grab;}
.ga-card:active{cursor:grabbing;}
.ga-card img{width:100%;height:110px;object-fit:cover;border-radius:8px;background:#fff;}
.ga-caption{width:100% !important;max-width:none !important;margin-top:8px;font-size:13px !important;padding:7px 9px !important;}
.ga-del{margin-top:8px;width:100%;}
.pd-card{border:1px solid var(--line);border-radius:14px;padding:18px;margin-bottom:16px;background:var(--card2);}
.pd-grid{display:flex;gap:20px;}
.pd-img-col{width:200px;flex-shrink:0;}
.pd-img-col .preview-box img{width:100%;max-height:150px;object-fit:cover;}
.pd-img-col .btn-save{width:100%;padding:9px 0;font-size:14px;}
.pd-fields{flex:1;min-width:0;}
.pd-fields input{max-width:none !important;}
.pd-row{display:flex;gap:14px;}
.pd-row .form-item{flex:1;}
textarea.pd-features{width:100%;background:var(--card2);border:1px solid rgba(20,26,38,.12);border-radius:10px;padding:11px 14px;font-size:14px;color:var(--txt);outline:none;font-family:inherit;resize:vertical;box-sizing:border-box;}
.pd-features:focus{border-color:var(--red2);}
.pd-status-label{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--txt);cursor:pointer;}
.pd-status-label input{width:auto !important;}
.pd-actions{display:flex;gap:12px;margin-top:14px;}
.pd-actions .btn-save{padding:9px 26px;font-size:14px;}

/* ===== 前台产品卡片 ===== */
.product-card{display:flex;flex-direction:column;padding:26px;}
.product-card .p-feats{margin:8px 0 4px;padding-left:18px;color:var(--sub);font-size:14px;}
.product-card .p-feats li{margin:3px 0;}
.p-price-row{margin:12px 0 14px;display:flex;align-items:baseline;gap:10px;}
.p-price{font-size:26px;font-weight:700;color:var(--red);}
.p-orig{font-size:14px;color:#9aa3b2;text-decoration:line-through;}
.product-card .btn-buy{margin-top:auto;text-align:center;}
@media (max-width:760px){
  .pd-grid{flex-direction:column;}
  .pd-img-col{width:100%;}
  .pd-row{flex-direction:column;gap:0;}
  .gallery-admin-grid{grid-template-columns:repeat(auto-fill,minmax(130px,1fr));}
}