/* 千佳机械 · 手机版样式（移动优先，不含重型动效） */
:root{
  --ink:#0B1115;--ink2:#141D23;--paper:#F5F6F3;--white:#fff;
  --line:#E2E6E0;--muted:#6C777C;--copper:#AE6A3A;--copper-l:#C99163;
  --r:2px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0;background:var(--paper);overflow-x:hidden}
body{
  font:15px/1.72 -apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--ink);padding-bottom:env(safe-area-inset-bottom);
  -webkit-text-size-adjust:100%;
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
h1,h2,h3,h4{margin:0;font-weight:600;letter-spacing:.01em}
p{margin:0}
em{font-style:normal}
.num{font-variant-numeric:tabular-nums}

/* 顶部 */
.top{position:sticky;top:0;z-index:50;background:rgba(11,17,21,.96);backdrop-filter:blur(8px)}
.top-in{display:flex;align-items:center;justify-content:space-between;height:52px;padding:0 16px}
.brand{display:flex;align-items:center;gap:8px;color:#fff}
.brand b{font-size:16px;letter-spacing:.08em}
.brand small{display:block;font-size:9px;letter-spacing:.16em;color:#8B989E;margin-top:1px}
.top .call{display:inline-flex;align-items:center;gap:6px;color:#fff;border:1px solid rgba(255,255,255,.28);
  height:32px;padding:0 12px;font-size:12.5px;border-radius:99px}
.top .call svg{width:13px;height:13px}

/* 页头（内页） */
.phead{padding:22px 16px 18px;background:var(--white);border-bottom:1px solid var(--line)}
.phead .crumb{font-size:11.5px;color:#9AA4A9;letter-spacing:.06em;margin-bottom:8px}
.phead h1{font-size:23px;line-height:1.3}
.phead p{margin-top:8px;font-size:13px;color:var(--muted);line-height:1.7}

/* 首屏 */
.hero{position:relative;background:var(--ink);color:#fff;padding:26px 16px 30px;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:44px 44px}
.hero .eyebrow{font-size:10.5px;letter-spacing:.22em;color:var(--copper-l);margin-bottom:12px}
.hero h1{font-size:30px;line-height:1.24;letter-spacing:-.01em}
.hero h1 span{color:var(--copper-l)}
.hero p{margin-top:14px;font-size:13.5px;line-height:1.8;color:#B8C2C6}
.hero-img{margin-top:20px;border:1px solid rgba(255,255,255,.14);padding:6px;position:relative}
.hero-img img{width:100%;height:auto;aspect-ratio:77/50;object-fit:cover;background:#F7F7F4}
.hero-img::before,.hero-img::after{content:'';position:absolute;width:12px;height:12px;border:1px solid var(--copper)}
.hero-img::before{top:-1px;left:-1px;border-right:0;border-bottom:0}
.hero-img::after{bottom:-1px;right:-1px;border-left:0;border-top:0}
.hero-cta{display:flex;gap:10px;margin-top:20px}
.hero-cta .b1,.hero-cta .b2{flex:1;height:46px;display:flex;align-items:center;justify-content:center;font-size:14px;border-radius:var(--r)}
.hero-cta .b1{background:var(--copper);color:#fff}
.hero-cta .b2{border:1px solid rgba(255,255,255,.3);color:#fff}

/* 快捷入口 4 宫格 */
.quick{display:grid;grid-template-columns:repeat(4,1fr);background:var(--white);border-bottom:1px solid var(--line)}
.quick a{display:flex;flex-direction:column;align-items:center;gap:7px;padding:16px 4px 14px;font-size:12px;color:#3C464B;border-right:1px solid #F0F2EE}
.quick a:last-child{border-right:0}
.quick svg{width:22px;height:22px;stroke:var(--ink);stroke-width:1.4;fill:none}
.quick a:active{background:#FAFBF8}

/* 区块 */
.sec{padding:26px 16px}
.sec--white{background:var(--white)}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;margin-bottom:16px}
.sec-head h2{font-size:20px;line-height:1.3}
.sec-head .more{font-size:12px;color:var(--copper);white-space:nowrap}
.eyebrow{font-size:10px;letter-spacing:.2em;color:var(--copper);margin-bottom:6px}

/* 分类九宫格 */
.cats{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}
.cat{background:var(--white);border:1px solid var(--line);padding:14px 10px;text-align:center;font-size:12.5px;line-height:1.45;color:#28323A}
.cat em{display:block;font-size:9.5px;letter-spacing:.1em;color:#A6AFA8;margin-top:4px}
.cat:active{background:#FAFBF8}

/* 机型横滑 */
.hscroll{display:flex;gap:11px;overflow-x:auto;padding:2px 16px 14px;margin:0 -16px;scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch}
.hscroll::-webkit-scrollbar{display:none}
.mcard{flex:0 0 62%;background:var(--white);border:1px solid var(--line);scroll-snap-align:start;overflow:hidden}
.mcard img{width:100%;height:auto;aspect-ratio:77/50;object-fit:cover;background:#F7F7F4}
.mcard .b{padding:9px 11px 11px}
.mcard em{font-size:10px;letter-spacing:.1em;color:var(--copper)}
.mcard b{display:block;font-size:13px;line-height:1.45;margin-top:3px;font-weight:600}

/* 产品列表 */
.plist{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.pitem{background:var(--white);border:1px solid var(--line);overflow:hidden}
.pitem img{width:100%;height:auto;aspect-ratio:77/50;object-fit:cover;background:#F7F7F4}
.pitem .b{padding:9px 10px 11px}
.pitem em{font-size:10px;letter-spacing:.08em;color:var(--copper)}
.pitem b{display:block;font-size:12.5px;line-height:1.45;margin-top:2px;font-weight:600;min-height:36px}

/* 筛选 chips */
.chips-wrap{position:sticky;top:52px;z-index:40;background:var(--white);border-bottom:1px solid var(--line);padding:9px 0}
.chips{display:flex;gap:7px;overflow-x:auto;padding:0 16px;scrollbar-width:none}
.chips::-webkit-scrollbar{display:none}
.chip{flex:0 0 auto;height:30px;padding:0 12px;border:1px solid var(--line);background:#fff;
  font-size:12.5px;color:#4B555B;display:flex;align-items:center;border-radius:99px}
.chip.on{background:var(--ink);border-color:var(--ink);color:#fff}
.searchbar{padding:9px 16px;background:var(--white)}
.searchbar input{width:100%;height:38px;border:1px solid var(--line);background:#F8F9F6;padding:0 12px;
  font-size:14px;border-radius:var(--r);outline:none;-webkit-appearance:none}
.searchbar input:focus{border-color:var(--copper);background:#fff}

/* 关于 */
.about-media{position:relative;margin-bottom:16px}
.about-media img{width:100%;height:auto;aspect-ratio:77/50;object-fit:cover;background:#F7F7F4}
.plate{margin-top:10px;border:1px solid var(--line);background:var(--white);padding:12px 14px}
.plate b{display:block;font-size:9.5px;letter-spacing:.18em;color:var(--muted);margin-bottom:4px}
.plate span{font-size:12.5px;line-height:1.65}
.lead{font-size:14px;line-height:1.85;color:#333D43}
.lead+.lead{margin-top:12px}
.kpis{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--line);border:1px solid var(--line);margin-top:18px}
.kpis div{background:#fff;padding:14px}
.kpis b{display:block;font-size:24px;line-height:1.2}
.kpis b small{font-size:11px;color:var(--muted);margin-left:2px;font-weight:400}
.kpis span{font-size:11.5px;color:var(--muted)}

/* 资讯 */
.nlist2{display:flex;flex-direction:column;gap:9px}
.nitem2{background:#fff;border:1px solid var(--line);padding:14px}
.nitem2 .meta{font-size:10.5px;letter-spacing:.12em;color:var(--copper);margin-bottom:6px}
.nitem2 h3{font-size:15px;line-height:1.5}
.nitem2 p{font-size:12.5px;color:var(--muted);line-height:1.75;margin-top:6px}
.nitem2 details{margin-top:8px}
.nitem2 summary{font-size:12px;color:var(--copper);list-style:none;cursor:pointer}
.nitem2 summary::-webkit-details-marker{display:none}
.nitem2 summary::after{content:' +'}
.nitem2 details[open] summary::after{content:' −'}
.nitem2 details p{font-size:12.5px;line-height:1.85;color:#3F4A50;margin-top:8px}

/* 联系 */
.ct-list{display:flex;flex-direction:column;gap:1px;background:var(--line);border:1px solid var(--line)}
.ct-row{display:flex;justify-content:space-between;gap:14px;background:#fff;padding:13px 14px;font-size:13px}
.ct-row span{color:var(--muted);flex:0 0 auto}
.ct-row b{font-weight:500;text-align:right;line-height:1.55}
.ct-btns{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:16px}
.ct-btns a{height:48px;display:flex;align-items:center;justify-content:center;gap:7px;font-size:14.5px;border-radius:var(--r)}
.ct-btns .p{background:var(--copper);color:#fff}
.ct-btns .s{border:1px solid var(--ink);color:var(--ink);background:#fff}

/* 表单 */
.form{background:#fff;border:1px solid var(--line);padding:16px}
.f-row{margin-bottom:12px}
.f-row label{display:block;font-size:11.5px;color:var(--muted);letter-spacing:.06em;margin-bottom:5px}
.f-row input,.f-row textarea{width:100%;border:1px solid var(--line);background:#FAFBF8;padding:10px 11px;
  font:inherit;font-size:14px;border-radius:var(--r);outline:none}
.f-row textarea{min-height:92px;resize:vertical}
.f-row input:focus,.f-row textarea:focus{border-color:var(--copper);background:#fff}
.submit{width:100%;height:48px;background:var(--ink);color:#fff;border:0;font:inherit;font-size:15px;border-radius:var(--r)}
.form-ok{display:none;padding:22px 16px;text-align:center;background:#fff;border:1px solid var(--line)}
.form-ok b{display:block;font-size:16px;margin-bottom:6px}
.form-ok p{font-size:13px;color:var(--muted)}

/* CTA */
.cta2{background:var(--ink);color:#fff;padding:28px 16px;text-align:center}
.cta2 h2{font-size:20px;line-height:1.4}
.cta2 p{font-size:13px;color:#A9B4B9;margin-top:10px;line-height:1.7}
.cta2 a{display:inline-flex;align-items:center;justify-content:center;margin-top:18px;height:46px;padding:0 26px;
  background:var(--copper);color:#fff;font-size:14.5px;border-radius:var(--r)}

/* 页脚 */
.foot2{padding:24px 16px 20px;background:#0F171C;color:#8B989E;font-size:11.5px;line-height:1.9}
.foot2 b{color:#D6DDE0;font-size:13px;display:block;margin-bottom:6px}
.foot2 .links{display:flex;gap:14px;flex-wrap:wrap;margin:12px 0 10px}
.foot2 .links a{color:#A9B4B9}
.foot2 .legal{margin-top:10px;padding-top:10px;border-top:1px solid rgba(255,255,255,.09);font-size:10.5px;line-height:1.8;color:#6F7C82}

/* 底部固定操作栏 */
.tabbar{position:fixed;left:0;right:0;bottom:0;z-index:60;display:grid;grid-template-columns:repeat(4,1fr);
  background:rgba(255,255,255,.97);border-top:1px solid var(--line);backdrop-filter:blur(10px);
  padding-bottom:env(safe-area-inset-bottom)}
.tabbar a{display:flex;flex-direction:column;align-items:center;gap:3px;padding:8px 0 7px;font-size:10.5px;color:#7C878D}
.tabbar a.on{color:var(--copper)}
.tabbar svg{width:20px;height:20px;stroke:currentColor;stroke-width:1.5;fill:none}
body{padding-bottom:64px}

/* 产品详情弹层 */
.sheet{position:fixed;inset:0;z-index:80;display:none}
.sheet.open{display:block}
.sheet-mask{position:absolute;inset:0;background:rgba(8,12,15,.55)}
.sheet-box{position:absolute;left:0;right:0;bottom:0;max-height:88vh;overflow-y:auto;background:#fff;
  border-radius:10px 10px 0 0;padding:16px 16px calc(20px + env(safe-area-inset-bottom));
  animation:up .28s ease}
@keyframes up{from{transform:translateY(24px);opacity:.6}to{transform:none;opacity:1}}
.sheet-close{position:absolute;right:10px;top:8px;width:34px;height:34px;border:0;background:none;font-size:24px;color:#8A9499;line-height:1}
.sheet img{width:100%;height:auto;max-height:44vh;aspect-ratio:77/50;object-fit:contain;background:#F7F7F4;margin-bottom:12px}
.sheet .sheet-cat{font-size:10.5px;letter-spacing:.12em;color:var(--copper);margin-bottom:2px}
.sheet h3{font-size:19px;line-height:1.35;margin:6px 0 8px}
.sheet .desc{font-size:13.5px;line-height:1.8;color:#3C464B}
.sheet table{width:100%;border-collapse:collapse;margin-top:14px;font-size:12.5px}
.sheet table caption{caption-side:top;text-align:left;font-size:11px;letter-spacing:.1em;color:var(--muted);padding-bottom:6px}
.sheet th,.sheet td{border-bottom:1px solid #EEF1EC;padding:8px 4px;text-align:left;vertical-align:top}
.sheet th{width:38%;color:var(--muted);font-weight:400}
.sheet .acts{display:flex;gap:10px;margin-top:16px}
.sheet .acts a{flex:1;height:46px;display:flex;align-items:center;justify-content:center;font-size:14px;border-radius:var(--r)}
.sheet .acts .p{background:var(--copper);color:#fff}
.sheet .acts .s{border:1px solid var(--ink);color:var(--ink)}

/* 电脑版切换 */
.to-pc{display:block;text-align:center;font-size:11.5px;color:#8A9499;padding:14px 0 4px}