:root{--ink:#0F172A;--ink2:#334155;--steel:#64748B;--line:#E2E8F0;--bg:#FFFFFF;--bg2:#F8FAFC;--bg3:#F0F7FD;--brand:#0284C7;--brand-d:#0369A1;--brand-l:#38BDF8;--max:1180px}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink2);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
h1,h2,h3{color:var(--ink);letter-spacing:-.4px;line-height:1.2}
.kicker{font-size:11.5px;letter-spacing:2px;text-transform:uppercase;color:var(--brand);font-weight:800;margin-bottom:10px}
.sub{font-size:15.5px;margin-top:12px;max-width:70ch;color:var(--ink2)}
.btn{display:inline-block;background:var(--brand);color:#fff;padding:11px 20px;border-radius:4px;font-size:14px;font-weight:700;box-shadow:0 2px 0 var(--brand-d);transition:transform .12s,background .12s}
.btn:hover{background:var(--brand-d);color:#fff;transform:translateY(-1px)}
.btn.line{background:none;border:1.5px solid var(--brand);color:var(--brand);box-shadow:none}
.btn.line:hover{background:var(--brand);color:#fff}
.hero{background:var(--ink);color:#CBD5E1;padding:64px 0 72px;position:relative;overflow:hidden}
.hero h1{color:#fff;font-size:clamp(28px,4.2vw,44px);font-weight:800;line-height:1.15;max-width:20ch}
.hero .sub{color:#B6C2D4;margin-top:18px}
.hero .sub b{color:#fff}
.hero .cta{margin-top:28px;display:flex;gap:12px;flex-wrap:wrap}
.hero .micro{margin-top:16px;font-size:12.5px;color:#7C8CA5}
.section{padding:56px 0}
.section.alt{background:var(--bg2)}
.section.dark{background:var(--ink);color:#CBD5E1;border-top:1px solid #1E293B;border-bottom:1px solid #1E293B}
.section.dark h2{color:#fff}
.section.dark .sub{color:#9FB0C4}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:30px}
.grid.two{grid-template-columns:repeat(2,1fr)}
@media(max-width:820px){.grid{grid-template-columns:1fr}}
.card{background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:22px 20px}
.section.dark .card{background:#0B1424;border-color:#1E293B}
.card .ic{font-size:22px;width:46px;height:46px;border-radius:11px;background:var(--bg3);display:flex;align-items:center;justify-content:center;color:var(--brand);margin-bottom:12px}
.card h3{font-size:17px;font-weight:800;margin-bottom:6px}
.card p{font-size:13.5px;color:var(--ink2);line-height:1.55}
.section.dark .card p{color:#9FB0C4}
.tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px}
.tags span{font-size:11.5px;background:var(--bg2);border:1px solid var(--line);color:var(--steel);border-radius:999px;padding:3px 9px}
.section.dark .tags span{background:#0B1424;border-color:#1E293B;color:#8C9BB1}
.spec{display:grid;grid-template-columns:repeat(4,1fr);gap:0;margin-top:34px}
@media(max-width:820px){.spec{grid-template-columns:repeat(2,1fr)}}
.spec div{padding:22px 24px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.spec .n{font-size:clamp(22px,3vw,30px);font-weight:800;color:var(--brand)}
.spec .l{font-size:12.5px;color:var(--steel);margin-top:4px}
.shotrow{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:22px}
@media(max-width:820px){.shotrow{grid-template-columns:1fr}}
.shotrow figure{margin:0}
.shotrow img{width:100%;height:230px;object-fit:cover;object-position:center;border-radius:8px;border:1px solid var(--line);background:var(--bg2)}
.shotrow figcaption{font-size:12.5px;color:var(--steel);margin-top:9px}
.goodsgrid{display:grid;grid-template-columns:repeat(6,1fr);gap:18px;margin-top:26px}
.goodsgrid>figure{grid-column:span 2}
.goodsgrid>.goodscta{grid-column:span 2}
@media(max-width:900px){.goodsgrid{grid-template-columns:repeat(2,1fr)}
  .goodsgrid>figure,.goodsgrid>.goodscta{grid-column:span 1}}
@media(max-width:600px){.goodsgrid{grid-template-columns:1fr}
  .goodsgrid>figure,.goodsgrid>.goodscta{grid-column:span 1}}
.goodsgrid figure{margin:0}
.goodsgrid img{width:100%;aspect-ratio:4/3;object-fit:cover;object-position:center;border-radius:8px;border:1px solid var(--line);background:#F5F6F8;display:block}
.goodsgrid figcaption{font-size:12.5px;color:var(--steel);margin-top:9px}
.goodscta{background:var(--ink);border-radius:8px;padding:24px 22px;display:flex;flex-direction:column;justify-content:center}
.goodscta h3{font-size:17px;font-weight:800;color:#fff;margin:0 0 8px}
.goodscta p{font-size:13.5px;color:#9FB0C4;line-height:1.55;margin:0 0 16px}
.goodscta .btn{align-self:flex-start}
.goodsfig{margin:26px 0 0}
.goodsfig img{width:100%;border-radius:8px;border:1px solid var(--line);display:block}
.goodsfig figcaption{font-size:12.5px;color:var(--steel);margin-top:10px}
.cta-band{background:linear-gradient(135deg,#0284C7,#0369A1);color:#E5F2FB;text-align:center;padding:54px 0}
.cta-band h2{color:#fff}
.cta-band .sub{color:#CDE6F6;margin:12px auto 0}
.cta-band .btns{margin-top:26px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.cta-band .btn{background:#fff;color:var(--brand-d);box-shadow:0 2px 0 #cbd5e1}
.cta-band .btn:hover{background:#F1F5F9}
.cta-band .btn.line{background:none;border:1.5px solid rgba(255,255,255,.6);color:#fff;box-shadow:none}
.cta-band .btn.line:hover{background:rgba(255,255,255,.12);color:#fff}
nav.topnav{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
nav.topnav .wrap{display:flex;align-items:center;gap:18px;height:64px}
.brand b{font-size:16px;letter-spacing:.6px;color:var(--ink);font-weight:800}
.brand b em{font-style:normal;color:var(--brand)}
.brand span{font-size:9.5px;color:var(--steel);letter-spacing:1.5px;font-weight:600}
.topnav .gq{margin-left:auto}
footer{background:var(--ink);color:#94A3B8;font-size:13px;padding:40px 0}
footer .wrap{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:30px}
@media(max-width:760px){footer .wrap{grid-template-columns:1fr}}
footer b{color:#fff;font-size:13px;letter-spacing:1px;text-transform:uppercase;display:block;margin-bottom:11px;font-weight:800}
footer a{color:#CBD5E1}
footer a:hover{color:#fff;text-decoration:underline}
.fbot{border-top:1px solid #1E293B;margin-top:26px;padding-top:16px;font-size:12.5px;color:#64748B}

/* camera accessories — small product cards */
.prodgrid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin-top:22px}
.prodgrid figure{margin:0}
.prodgrid img{width:100%;height:auto;aspect-ratio:3/4;object-fit:contain;object-position:center;border-radius:8px;border:1px solid var(--line);background:#fff;display:block}
.prodgrid figcaption{font-size:12.5px;color:var(--steel);margin-top:9px;line-height:1.5}
@media(max-width:900px){.prodgrid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:640px){.prodgrid{grid-template-columns:1fr}}

/* 方形产品图专用的三列变体（自行车配件页）——限宽居中，图不要撑满整行 */
.prodgrid.three{grid-template-columns:repeat(3,minmax(0,1fr));max-width:860px;margin-left:auto;margin-right:auto}
.prodgrid.three img{aspect-ratio:1/1}
@media(max-width:900px){.prodgrid.three{grid-template-columns:repeat(2,minmax(0,1fr));max-width:540px}}
@media(max-width:560px){.prodgrid.three{grid-template-columns:1fr;max-width:300px}}

/* 自行车三图横拼 */
.bike-collage{width:100%;max-width:860px;display:block;margin:22px auto 0;border-radius:8px;border:1px solid var(--line);background:#fff}

/* 单张产品图（夹具页）——限宽居中，避免撑满整行 */
.shot{width:100%;max-width:620px;display:block;margin:22px auto 0;border-radius:8px;border:1px solid var(--line);background:#fff}

/* EDC — 两张大图并排（不裁切，contain 保留整支笔） */
.pairrow{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-top:22px}
.pairrow figure{margin:0}
.pairrow img{width:100%;height:auto;display:block;object-fit:contain;background:#fff;
  border-radius:8px;border:1px solid var(--line)}
@media(max-width:820px){.pairrow{grid-template-columns:1fr}}