/* Rimzer Casters & Wheels — rimzer.com.cn */
:root{
  --ink:#152029; --ink2:#4a5a67; --ink3:#7c8b96;
  --brand:#0f4c5c; --brand2:#0a3846; --brand3:#1a6b7d;
  --accent:#f2a01f; --accent2:#d98a10;
  --bg:#fff; --soft:#f3f6f8; --soft2:#e9eef2; --line:#dfe6ea;
  --max:1180px; --radius:14px;
  --shadow:0 1px 2px rgba(15,40,55,.06),0 8px 24px rgba(15,40,55,.07);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font:16px/1.75 "Segoe UI","Microsoft YaHei","PingFang SC","Hiragino Sans GB",system-ui,-apple-system,Roboto,Arial,sans-serif;
  color:var(--ink);background:var(--bg);
}
img{max-width:100%;height:auto;display:block}
a{color:var(--brand3);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--max);margin:0 auto;padding:0 22px}
h1{font-size:2.15rem;line-height:1.28;letter-spacing:-.01em;margin:0 0 .55em}
h2{font-size:1.55rem;line-height:1.35;margin:0 0 .5em;letter-spacing:-.01em}
h3{font-size:1.12rem;line-height:1.5;margin:0 0 .4em}
p{margin:0 0 1em}
ul,ol{margin:0 0 1em 1.15em}
li{margin:.25em 0}
.muted{color:var(--ink2)}
.small{font-size:.88rem}
.center{text-align:center}
.eyebrow{display:inline-block;font-size:.78rem;font-weight:700;letter-spacing:.18em;text-transform:uppercase;color:var(--accent2);margin-bottom:.6em}
.lead{font-size:1.08rem;color:var(--ink2)}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.header-in{display:flex;align-items:center;gap:20px;min-height:72px}
.brand{display:flex;align-items:center;gap:11px;flex-shrink:0}
.brand-mark{width:40px;height:40px;border-radius:11px;background:linear-gradient(140deg,var(--brand),var(--brand3));color:#fff;
  display:flex;align-items:center;justify-content:center;font:800 1.15rem/1 Georgia,serif;letter-spacing:.02em}
.brand-txt{display:flex;flex-direction:column;line-height:1.15}
.brand-cn{font-size:1.06rem;font-weight:800;letter-spacing:.02em;color:var(--ink)}
.brand-en{font-size:.66rem;font-weight:700;letter-spacing:.19em;color:var(--brand3);text-transform:uppercase}
.nav{margin-left:auto}
.nav ul{display:flex;list-style:none;gap:2px;margin:0}
.nav a{display:block;padding:8px 12px;border-radius:8px;color:var(--ink2);font-weight:600;font-size:.94rem;white-space:nowrap}
.nav a:hover,.nav a.active{background:var(--soft);color:var(--brand);text-decoration:none}
.header-right{display:flex;align-items:center;gap:10px;flex-shrink:0}
.lang{display:flex;align-items:center;gap:6px;font-size:.86rem;font-weight:700;color:var(--ink3)}
.lang a{padding:4px 6px;border-radius:6px;color:var(--ink3)}
.lang a:hover{background:var(--soft);text-decoration:none}
.lang .on{color:var(--brand);background:var(--soft)}
.lang .sep{color:var(--line)}
.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 20px;border-radius:10px;font-weight:700;font-size:.94rem;border:1px solid transparent;cursor:pointer;transition:.18s}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-accent{background:var(--accent);color:#231a06}
.btn-accent:hover{background:var(--accent2)}
.btn-brand{background:var(--brand);color:#fff}
.btn-brand:hover{background:var(--brand2)}
.btn-ghost{border-color:rgba(255,255,255,.5);color:#fff;background:rgba(255,255,255,.08)}
.btn-ghost:hover{background:rgba(255,255,255,.18)}
.btn-line{border-color:var(--line);color:var(--ink);background:#fff}
.btn-line:hover{border-color:var(--brand3);color:var(--brand3)}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:9px;width:42px;height:38px;cursor:pointer;align-items:center;justify-content:center}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--ink);position:relative}
.nav-toggle span:before,.nav-toggle span:after{content:"";position:absolute;left:0;width:18px;height:2px;background:var(--ink)}
.nav-toggle span:before{top:-6px}.nav-toggle span:after{top:6px}

/* ---------- hero ---------- */
.hero{position:relative;color:#fff;background:var(--brand2);overflow:hidden}
.hero-img{position:absolute;inset:0}
.hero-img img{width:100%;height:100%;object-fit:cover;opacity:.42}
.hero:after{content:"";position:absolute;inset:0;background:linear-gradient(100deg,rgba(8,38,48,.94) 0%,rgba(8,38,48,.74) 46%,rgba(8,38,48,.42) 100%)}
.hero-in{position:relative;z-index:2;padding:86px 0 76px;max-width:660px}
.hero h1{font-size:2.5rem;color:#fff}
.hero p{color:#d5e3e8;font-size:1.1rem;max-width:560px}
.hero-badges{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0 26px}
.badge{padding:6px 13px;border-radius:999px;background:rgba(255,255,255,.13);border:1px solid rgba(255,255,255,.22);font-size:.82rem;font-weight:600;color:#eaf3f6}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px}

/* ---------- sections ---------- */
section{padding:64px 0}
.sec-soft{background:var(--soft)}
.sec-head{max-width:720px;margin-bottom:34px}
.sec-head.center{margin-left:auto;margin-right:auto}
.sec-head p{color:var(--ink2);margin-bottom:0}

.grid{display:grid;gap:20px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}

.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:.2s}
.card:hover{border-color:#c9d8de;box-shadow:var(--shadow);transform:translateY(-2px)}
.card h3{margin-bottom:.35em}
.card p{margin-bottom:0;color:var(--ink2);font-size:.95rem}
.card .ico{width:44px;height:44px;border-radius:12px;background:var(--soft);display:flex;align-items:center;justify-content:center;margin-bottom:14px;font-size:1.25rem}

/* category tiles */
.cats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.cat{position:relative;display:block;border-radius:var(--radius);overflow:hidden;background:var(--soft2);min-height:168px;border:1px solid var(--line)}
.cat img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:.35s;opacity:.92}
.cat:hover img{transform:scale(1.05)}
.cat span{position:absolute;left:0;right:0;bottom:0;padding:26px 16px 14px;color:#fff;font-weight:700;font-size:.98rem;
  background:linear-gradient(transparent,rgba(9,32,42,.86))}
.cat:hover span{text-decoration:none}

/* product grid */
.p-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.p-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:.2s}
.p-card:hover{box-shadow:var(--shadow);transform:translateY(-2px);border-color:#c9d8de}
.p-card .thumb{aspect-ratio:4/3;background:var(--soft);display:flex;align-items:center;justify-content:center;overflow:hidden}
.p-card .thumb img{width:100%;height:100%;object-fit:cover}
.p-card .body{padding:14px 16px 18px;display:flex;flex-direction:column;gap:4px;flex:1}
.p-card .name{font-weight:700;font-size:.98rem;color:var(--ink)}
.p-card .code{font-size:.8rem;color:var(--ink3);letter-spacing:.04em;font-family:ui-monospace,Consolas,monospace}
.p-card .cat-tag{font-size:.76rem;color:var(--brand3);font-weight:700}
.p-card .more{margin-top:auto;font-size:.86rem;font-weight:700;color:var(--brand3)}
a.p-card{text-decoration:none}
a.p-card:hover{text-decoration:none}

/* product detail */
.pd{display:grid;grid-template-columns:1.05fr 1fr;gap:44px;align-items:start}
.pd-gallery{position:sticky;top:96px}
.pd-main{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--soft)}
.pd-main img{width:100%;aspect-ratio:4/3;object-fit:contain}
.pd-thumbs{display:flex;gap:10px;margin-top:12px;flex-wrap:wrap}
.pd-thumbs img{width:76px;height:76px;object-fit:cover;border:1px solid var(--line);border-radius:9px;cursor:pointer;background:#fff}
.pd-thumbs img.on{border-color:var(--brand3);box-shadow:0 0 0 2px rgba(26,107,125,.18)}
.pd-meta{display:flex;gap:10px;flex-wrap:wrap;margin:0 0 16px}
.chip{font-size:.78rem;font-weight:700;padding:5px 11px;border-radius:999px;background:var(--soft);color:var(--brand);border:1px solid var(--line)}
.chip-code{font-family:ui-monospace,Consolas,monospace;letter-spacing:.03em}
.spec{width:100%;border-collapse:collapse;margin:18px 0 24px;font-size:.94rem}
.spec th,.spec td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.spec th{width:42%;color:var(--ink2);font-weight:600;background:var(--soft)}
.spec tr:last-child td,.spec tr:last-child th{border-bottom:0}
.prose{max-width:760px}
.prose h2{margin-top:1.6em}
.prose ul{margin-left:1.15em}

/* breadcrumb */
.crumb{font-size:.85rem;color:var(--ink3);padding:18px 0 0}
.crumb a{color:var(--ink3)}
.crumb span{margin:0 6px;color:#c3ced5}

/* page head */
.pagehead{background:var(--brand2);color:#fff;padding:52px 0 46px}
.pagehead h1{color:#fff;margin-bottom:.25em;font-size:2rem}
.pagehead p{color:#cfe0e6;margin:0;max-width:640px}

/* filter tabs */
.tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:26px}
.tab{padding:8px 15px;border-radius:999px;border:1px solid var(--line);background:#fff;font-size:.9rem;font-weight:600;color:var(--ink2);cursor:pointer}
.tab:hover{border-color:var(--brand3);color:var(--brand3)}
.tab.on{background:var(--brand);border-color:var(--brand);color:#fff}

/* cert */
.cert-list{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.cert{display:flex;gap:16px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.cert .no{flex:0 0 58px;height:58px;border-radius:12px;background:linear-gradient(140deg,var(--brand),var(--brand3));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:.78rem;text-align:center;line-height:1.2}
.cert h3{margin-bottom:.2em;font-size:1.02rem}
.cert p{margin:0;font-size:.9rem;color:var(--ink2)}
.cert-imgs{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:26px}
.cert-imgs a{display:block;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#fff}
.cert-imgs img{width:100%;aspect-ratio:3/4;object-fit:contain;background:#fff}

/* news */
.news-item{display:grid;grid-template-columns:120px 1fr;gap:22px;padding:22px 0;border-bottom:1px solid var(--line)}
.news-item time{font-size:.86rem;color:var(--ink3);font-weight:600}
.news-item h3{margin-bottom:.25em}
.news-item p{margin:0;color:var(--ink2);font-size:.95rem}

/* cta band */
.cta{background:linear-gradient(115deg,var(--brand2),var(--brand3));color:#fff;padding:56px 0}
.cta-in{display:flex;align-items:center;justify-content:space-between;gap:26px;flex-wrap:wrap}
.cta h2{color:#fff;margin-bottom:.2em}
.cta p{margin:0;color:#cfe0e6}

/* contact */
.contact-grid{display:grid;grid-template-columns:.95fr 1.05fr;gap:44px;align-items:start}
.info-list{list-style:none;margin:0;padding:0}
.info-list li{display:flex;gap:12px;padding:13px 0;border-bottom:1px dashed var(--line);font-size:.95rem}
.info-list li:last-child{border-bottom:0}
.info-list b{flex:0 0 84px;color:var(--ink2);font-weight:600}
form.inquiry{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow)}
.field{margin-bottom:14px}
.field label{display:block;font-size:.86rem;font-weight:700;margin-bottom:6px;color:var(--ink2)}
.field input,.field textarea,.field select{width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:9px;font:inherit;font-size:.95rem;background:#fdfefe}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--brand3);box-shadow:0 0 0 3px rgba(26,107,125,.12)}
.field textarea{min-height:120px;resize:vertical}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.cap-row{display:flex;align-items:center;gap:12px}
.cap-row img{border-radius:8px;border:1px solid var(--line);height:46px;width:auto}
.hp{position:absolute;left:-9999px;opacity:0;height:0;width:0}

/* footer */
.site-footer{background:#0b2833;color:#a9c0c9;padding:52px 0 26px;font-size:.92rem}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:34px}
.site-footer h4{color:#fff;font-size:.95rem;margin-bottom:14px;letter-spacing:.02em}
.site-footer a{color:#c2d6de}
.site-footer a:hover{color:#fff}
.site-footer ul{list-style:none;margin:0}
.site-footer li{margin:.4em 0}
.foot-brand{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.foot-brand .brand-mark{background:linear-gradient(140deg,#1a6b7d,#0f4c5c)}
.foot-brand .brand-cn{color:#fff}
.foot-brand .brand-en{color:#7fb0bf}
.foot-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:34px;padding-top:18px;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;font-size:.84rem;color:#7f9aa5}

/* misc */
.note{background:#fff8e8;border:1px solid #f2dca8;border-radius:12px;padding:14px 16px;font-size:.9rem;color:#6b5320}
.pill-row{display:flex;gap:10px;flex-wrap:wrap;margin:18px 0}
.stat-row{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:8px}
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.stat b{display:block;font-size:1.6rem;color:var(--brand);line-height:1.2}
.stat span{font-size:.86rem;color:var(--ink2)}

@media (max-width:1050px){
  .cats,.p-grid,.g4{grid-template-columns:repeat(3,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:900px){
  .header-in{gap:12px;min-height:64px}
  .nav-toggle{display:flex;margin-left:auto;order:2}
  .nav{position:fixed;left:0;right:0;top:64px;background:#fff;border-bottom:1px solid var(--line);
    box-shadow:0 18px 30px rgba(10,35,45,.12);padding:10px 16px 16px;display:none;margin:0;z-index:70}
  .nav.open{display:block}
  .nav ul{flex-direction:column;gap:0}
  .nav a{padding:12px 6px;border-radius:0;border-bottom:1px solid var(--soft2);font-size:1rem}
  .header-right{order:3;gap:6px}
  .header-right .btn{padding:9px 14px;font-size:.88rem}
  .hero-in{padding:60px 0 54px}
  .hero h1{font-size:1.9rem}
  .pd{grid-template-columns:1fr;gap:26px}
  .pd-gallery{position:static}
  .contact-grid{grid-template-columns:1fr;gap:28px}
  .cert-list{grid-template-columns:1fr}
  section{padding:48px 0}
  .g2,.g3,.g4,.cats,.p-grid,.cert-imgs,.row2,.stat-row{grid-template-columns:1fr 1fr}
}
@media (max-width:600px){
  h1{font-size:1.7rem}
  .hero h1{font-size:1.62rem}
  .pagehead{padding:38px 0 34px}
  .g2,.g3,.g4,.cats,.p-grid,.cert-imgs,.row2,.stat-row,.foot-grid{grid-template-columns:1fr}
  .news-item{grid-template-columns:1fr;gap:6px}
  .header-right .lang{display:none}
}