:root{
  --navy:#0f1b2d;
  --navy-2:#17263c;
  --steel:#5a6b80;
  --line:#e2e7ee;
  --bg:#ffffff;
  --bg-soft:#f5f7fa;
  --amber:#e8801a;
  --amber-dark:#c96a10;
  --text:#1c2733;
  --muted:#66758a;
  --radius:10px;
  --shadow:0 4px 20px rgba(15,27,45,.08);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--text);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:1180px;margin:0 auto;padding:0 24px}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:saturate(180%) blur(8px)}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px;gap:24px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:.3px}
.logo-mark{width:38px;height:38px;border-radius:9px;background:var(--navy);color:#fff;display:grid;place-items:center;font-size:15px;font-weight:800;letter-spacing:-.5px}
.logo-text{display:flex;flex-direction:column;line-height:1.15}
.logo-text b{font-size:16px;color:var(--navy)}
.logo-text span{font-size:10.5px;color:var(--muted);letter-spacing:.6px;text-transform:uppercase;font-weight:600}
.nav-links{display:flex;gap:28px;font-size:14.5px;font-weight:600;color:var(--navy-2)}
.nav-links a{padding:6px 0;border-bottom:2px solid transparent;transition:.2s}
.nav-links a:hover,.nav-links a.active{color:var(--amber);border-bottom-color:var(--amber)}
.nav-cta{display:flex;gap:10px;align-items:center}
.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 20px;border-radius:8px;font-weight:700;font-size:14.5px;transition:.2s;border:1.5px solid transparent;cursor:pointer}
.btn-primary{background:var(--amber);color:#fff}
.btn-primary:hover{background:var(--amber-dark);transform:translateY(-1px)}
.btn-ghost{border-color:var(--line);color:var(--navy)}
.btn-ghost:hover{border-color:var(--navy);background:var(--bg-soft)}
.btn-light{background:#fff;color:var(--navy)}
.btn-light:hover{background:#f0f3f7}
.menu-toggle{display:none;background:none;border:0;font-size:24px;color:var(--navy);cursor:pointer}

/* hero */
.hero{position:relative;background:linear-gradient(135deg,var(--navy) 0%,#152741 55%,#1d3553 100%);color:#fff;overflow:hidden}
.hero::after{content:"";position:absolute;inset:0;background:url("../img/bucket-215vs-1.jpg") center/cover;opacity:.18;mix-blend-mode:luminosity}
.hero-inner{position:relative;z-index:2;display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;padding:78px 0 88px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:700;letter-spacing:1.4px;text-transform:uppercase;color:#ffcf9b;margin-bottom:18px}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--amber)}
.hero h1{font-size:44px;line-height:1.18;font-weight:800;letter-spacing:-.6px;margin-bottom:18px}
.hero h1 em{font-style:normal;color:#ffb15c}
.hero p.lead{font-size:16.5px;color:#c7d3e2;max-width:560px;margin-bottom:28px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:34px}
.hero-stats{display:flex;gap:34px;flex-wrap:wrap;border-top:1px solid rgba(255,255,255,.16);padding-top:24px}
.stat b{display:block;font-size:22px;font-weight:800;color:#fff}
.stat span{font-size:12.5px;color:#9fb0c6;letter-spacing:.3px}
.hero-visual{position:relative}
.hero-visual .frame{border-radius:14px;overflow:hidden;box-shadow:0 24px 60px rgba(0,0,0,.35);border:1px solid rgba(255,255,255,.12)}
.hero-visual .frame img{width:100%;height:380px;object-fit:cover}
.hero-badge{position:absolute;bottom:-16px;left:-16px;background:#fff;color:var(--navy);border-radius:12px;padding:14px 18px;box-shadow:var(--shadow);display:flex;gap:12px;align-items:center}
.hero-badge b{display:block;font-size:14px}
.hero-badge span{font-size:11.5px;color:var(--muted)}

/* sections */
section{padding:74px 0}
.section-soft{background:var(--bg-soft)}
.section-head{max-width:680px;margin-bottom:42px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.kicker{font-size:12.5px;font-weight:800;letter-spacing:1.5px;text-transform:uppercase;color:var(--amber);margin-bottom:10px}
h2{font-size:32px;line-height:1.25;font-weight:800;letter-spacing:-.4px;color:var(--navy);margin-bottom:12px}
.section-head p{color:var(--muted);font-size:15.5px}

/* cards */
.grid{display:grid;gap:22px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.25s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#d3dbe6}
.card-img{height:200px;background:#eef1f5;overflow:hidden}
.card-img img{width:100%;height:100%;object-fit:cover;transition:.4s}
.card:hover .card-img img{transform:scale(1.04)}
.card-body{padding:20px 20px 22px;flex:1;display:flex;flex-direction:column}
.card-body h3{font-size:16.5px;font-weight:750;color:var(--navy);margin-bottom:7px}
.card-body p{font-size:13.8px;color:var(--muted);flex:1}
.tagline{margin-top:14px;font-size:12px;font-weight:700;color:var(--amber);letter-spacing:.4px;text-transform:uppercase}

/* spec list */
.spec{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}
.chip{font-size:11.5px;font-weight:700;color:var(--navy-2);background:var(--bg-soft);border:1px solid var(--line);border-radius:999px;padding:4px 10px}

/* features */
.feature{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px}
.feature .ico{width:44px;height:44px;border-radius:10px;background:#fff4e8;color:var(--amber-dark);display:grid;place-items:center;font-size:19px;font-weight:800;margin-bottom:16px}
.feature h3{font-size:16px;font-weight:750;color:var(--navy);margin-bottom:8px}
.feature p{font-size:13.8px;color:var(--muted)}

/* models strip */
.models{display:flex;flex-wrap:wrap;gap:10px}
.model-pill{border:1px solid rgba(255,255,255,.18);border-radius:999px;padding:7px 15px;font-size:13px;font-weight:650;color:#dbe4ef}

/* cta band */
.cta-band{background:linear-gradient(120deg,var(--navy),#1d3553);color:#fff;border-radius:16px;padding:48px;display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap}
.cta-band h2{color:#fff;margin-bottom:8px}
.cta-band p{color:#b7c6d8;font-size:15px;max-width:560px}

/* tables */
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{text-align:left;padding:13px 16px;border-bottom:1px solid var(--line)}
th{background:var(--bg-soft);font-weight:750;color:var(--navy);font-size:13px;letter-spacing:.3px;text-transform:uppercase}
td{color:var(--navy-2)}
tr:last-child td{border-bottom:0}
.table-wrap{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff}

/* contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:start}
.info-item{display:flex;gap:14px;padding:16px 0;border-bottom:1px solid var(--line)}
.info-item:last-child{border-bottom:0}
.info-item .ico{width:40px;height:40px;border-radius:10px;background:var(--bg-soft);display:grid;place-items:center;font-size:17px;flex:none}
.info-item b{display:block;font-size:13px;color:var(--muted);font-weight:700;letter-spacing:.3px;text-transform:uppercase;margin-bottom:3px}
.info-item span{font-size:15.5px;font-weight:650;color:var(--navy);word-break:break-word}
form{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px}
label{display:block;font-size:13px;font-weight:700;color:var(--navy-2);margin:0 0 6px}
input,textarea,select{width:100%;padding:11px 13px;border:1.5px solid var(--line);border-radius:8px;font-family:inherit;font-size:14.5px;color:var(--text);margin-bottom:16px;background:#fff}
input:focus,textarea:focus,select:focus{outline:none;border-color:var(--amber)}
textarea{min-height:110px;resize:vertical}
.form-note{font-size:12.5px;color:var(--muted);margin-top:6px}

/* footer */
footer{background:var(--navy);color:#a9b9cc;padding:56px 0 26px;font-size:14px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px;padding-bottom:34px;border-bottom:1px solid rgba(255,255,255,.1)}
footer h4{color:#fff;font-size:14px;font-weight:750;margin-bottom:14px;letter-spacing:.4px;text-transform:uppercase}
footer a:hover{color:#ffb15c}
.foot-links{display:flex;flex-direction:column;gap:9px}
.foot-bottom{padding-top:22px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:12.8px;color:#7d8fa6}
.foot-logo{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.foot-logo .logo-mark{background:var(--amber)}
.foot-logo b{color:#fff;font-size:15px}

/* floating whatsapp */
.float-wa{position:fixed;right:22px;bottom:22px;z-index:60;background:#25d366;color:#fff;border-radius:999px;padding:13px 20px;font-weight:750;font-size:14px;box-shadow:0 8px 24px rgba(37,211,102,.35);display:flex;align-items:center;gap:9px}
.float-wa:hover{background:#1ebe5b}

/* page header */
.page-head{background:var(--navy);color:#fff;padding:56px 0}
.page-head h1{font-size:36px;font-weight:800;letter-spacing:-.4px;margin-bottom:10px}
.page-head p{color:#b7c6d8;max-width:640px;font-size:15.5px}
.breadcrumb{font-size:13px;color:#8fa3bb;margin-bottom:14px}
.breadcrumb a:hover{color:#ffb15c}

@media(max-width:960px){
  .hero-inner{grid-template-columns:1fr;padding:56px 0 64px;gap:36px}
  .hero h1{font-size:34px}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr}
  .contact-grid{grid-template-columns:1fr}
  .nav-links{display:none}
  .menu-toggle{display:block}
  .nav-links.open{display:flex;position:absolute;top:72px;left:0;right:0;background:#fff;flex-direction:column;padding:18px 24px;gap:16px;border-bottom:1px solid var(--line)}
}
@media(max-width:640px){
  .grid-3,.grid-2,.grid-4{grid-template-columns:1fr}
  .hero h1{font-size:29px}
  h2{font-size:25px}
  section{padding:52px 0}
  .cta-band{padding:32px 24px}
  .nav-cta .btn-ghost{display:none}
}

/* ===== 零件号 / 机型检索（products.html）===== */
.part-search-band{background:linear-gradient(120deg,#0f1b2d 0%,#1d3553 100%);padding:30px 0 24px}
.ps-box{position:relative;display:flex;align-items:center;background:#fff;border-radius:12px;
  max-width:760px;margin:0 auto;box-shadow:0 12px 34px rgba(0,0,0,.22);border:1px solid rgba(255,255,255,.14)}
.ps-box input{flex:1;border:0;outline:0;padding:17px 46px 17px 48px;font-size:15.5px;border-radius:12px;
  color:#0f1b2d;background:transparent;font-family:inherit}
.ps-box input::-webkit-search-cancel-button,.ps-box input::-webkit-search-decoration{-webkit-appearance:none;display:none}
.ps-box input::placeholder{color:#8b97a6}
.ps-ico{position:absolute;left:18px;font-size:16px;opacity:.45;pointer-events:none}
#psClear{position:absolute;right:10px;width:30px;height:30px;border:0;border-radius:50%;background:#eef1f5;
  color:#7b8794;font-size:13px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:.2s}
#psClear:hover{background:#dde3ea;color:#0f1b2d}
.ps-result{max-width:760px;margin:12px auto 0;font-size:13.5px;line-height:1.9;color:#c8d3e0;text-align:center}
.ps-result.ok{color:#9fe6b0;font-weight:600}
.ps-result.none{color:#ffd9b0}
.ps-act{display:inline-block;margin-left:10px;padding:6px 14px;border-radius:999px;background:#e8801a;color:#fff;
  font-size:12.5px;font-weight:700;text-decoration:none;white-space:nowrap}
.ps-act:hover{background:#f2913a;color:#fff}
.ps-act.ghost{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.3)}
.ps-act.ghost:hover{background:rgba(255,255,255,.24)}
@media(max-width:760px){.part-search-band{padding:22px 0 18px}
  .ps-box input{font-size:14px;padding:14px 42px 14px 42px}
  .ps-act{margin:8px 6px 0 0}}