/* ============================================================
   DAPU AUTO PARTS — style.css
   Design language referenced from highlink.com:
   white / light-grey ground, soft steel-blue accent, Open Sans,
   generous whitespace, thin rules, restrained industrial feel.
   ============================================================ */

:root{
  --ink:#1a1c20;
  --ink-2:#4a4f57;
  --ink-3:#7b828c;
  --ink-4:#a8aeb6;
  --line:#e4e6e9;
  --line-2:#d0d4d9;
  --bg:#ffffff;
  --bg-2:#f5f6f7;
  --bg-3:#eceef0;
  /* highlink 主色 #abd1e3 的加深版，用于文字与按钮（原色对比度不足） */
  --brand:#1b3a5c;
  --brand-2:#2d6b96;
  --brand-lt:#abd1e3;
  --accent:#c8102e;

  --wrap:1200px;
  --pad:clamp(18px,4.6vw,40px);
  --ff:"Open Sans","Segoe UI",Roboto,"Helvetica Neue",Arial,
       "PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --ease:cubic-bezier(.25,.6,.25,1);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--ff);font-size:15.5px;line-height:1.7;
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
  overflow-wrap:break-word;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0;font-weight:700;line-height:1.2;letter-spacing:-.015em}
p{margin:0}
ul,ol,dl,dd,dt{margin:0;padding:0}
li{list-style:none}
button{font-family:inherit}
:focus-visible{outline:2px solid var(--brand-2);outline-offset:2px}

.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--pad)}
.sec{padding:clamp(52px,7vw,84px) 0}
.sec--alt{background:var(--bg-2);border-block:1px solid var(--line)}

/* ---------- 排版 ---------- */
.eyebrow{
  font-size:11.5px;font-weight:700;letter-spacing:.15em;
  text-transform:uppercase;color:var(--brand-2);margin-bottom:11px;
}
.eyebrow--c{text-align:center}
.sec__h2{
  font-size:clamp(23px,3vw,34px);letter-spacing:-.025em;margin-bottom:12px;
}
.sec__lead{
  font-size:15.5px;color:var(--ink-3);max-width:66ch;line-height:1.72;
}
.sec .eyebrow--c + .sec__h2{text-align:center}
.sec .eyebrow--c ~ .sec__lead{margin-inline:auto;text-align:center;
  margin-bottom:clamp(30px,4vw,44px)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 26px;
  font-size:14.5px;font-weight:600;
  border:1px solid transparent;border-radius:3px;cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),
             border-color .2s var(--ease),transform .15s var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn--dark{background:var(--brand);color:#fff}
.btn--dark:hover{background:#122a44}
.btn--line{background:#fff;color:var(--brand);border-color:var(--line-2)}
.btn--line:hover{border-color:var(--brand);background:var(--brand);color:#fff}
.btn--lt{background:#fff;color:var(--brand)}
.btn--lt:hover{background:var(--brand-lt);color:var(--brand)}
.btn--sm{height:38px;padding:0 16px;font-size:13.5px}
.btn--full{width:100%}
.btn--ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.45)}
.btn--ghost:hover{background:rgba(255,255,255,.14)}

/* ============================================================
   HEADER
   ============================================================ */
.hdr{
  position:sticky;top:0;z-index:50;background:#fff;
  border-bottom:1px solid var(--line);
}
.hdr__in{display:flex;align-items:center;gap:28px;height:74px}

.brand{display:flex;flex-direction:column;line-height:1;flex:0 0 auto}
.brand__mark{font-size:23px;font-weight:800;letter-spacing:-.03em;color:var(--brand)}
.brand__sub{
  font-size:8px;font-weight:700;letter-spacing:.26em;
  color:var(--ink-4);margin-top:5px;
}

.nav{display:flex;gap:26px;margin-left:auto}
.nav a{
  position:relative;font-size:14.5px;font-weight:600;color:var(--ink-2);
  padding:6px 0;transition:color .18s var(--ease);
}
.nav a::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--brand-2);transform:scaleX(0);transform-origin:left;
  transition:transform .22s var(--ease);
}
.nav a:hover,.nav a.on{color:var(--brand)}
.nav a:hover::after,.nav a.on::after{transform:scaleX(1)}

.hdr__cta{
  flex:0 0 auto;display:inline-flex;align-items:center;height:40px;
  padding:0 20px;background:var(--brand);color:#fff;
  font-size:13.5px;font-weight:600;border-radius:3px;
  transition:background .2s var(--ease);
}
.hdr__cta:hover{background:#122a44}

.burger{
  display:none;flex:0 0 auto;width:42px;height:42px;padding:0;
  background:none;border:1px solid var(--line-2);border-radius:3px;
  cursor:pointer;flex-direction:column;align-items:center;justify-content:center;gap:4px;
}
.burger span{display:block;width:17px;height:2px;background:var(--ink);
  transition:transform .22s var(--ease),opacity .2s}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* ============================================================
   HERO
   ============================================================ */
.hero{
  background:linear-gradient(180deg,#f7f9fa 0%,#fff 100%);
  border-bottom:1px solid var(--line);
  padding:clamp(40px,5.5vw,72px) 0 clamp(38px,5vw,62px);
}
.hero__in{
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.92fr);
  gap:clamp(32px,5vw,68px);align-items:center;
}
.hero h1{
  font-size:clamp(30px,4.6vw,54px);letter-spacing:-.035em;
  margin-bottom:20px;
}
.hero h1 em{font-style:normal;color:var(--brand-2)}
.hero__lead{
  font-size:clamp(15px,1.25vw,17px);color:var(--ink-2);
  max-width:52ch;line-height:1.72;
}
.hero__act{display:flex;gap:12px;flex-wrap:wrap;margin:30px 0 34px}
.hero__facts{
  display:grid;grid-template-columns:repeat(3,auto);
  gap:clamp(18px,3.4vw,42px);justify-content:start;
  padding-top:22px;border-top:1px solid var(--line);
}
.hero__facts div dt{
  font-size:11px;font-weight:700;letter-spacing:.11em;
  text-transform:uppercase;color:var(--ink-4);margin-bottom:4px;
}
.hero__facts div dd{font-size:15px;font-weight:700;color:var(--brand)}

.hero__fig{
  margin:0;background:#fff;border:1px solid var(--line);
  border-radius:4px;overflow:hidden;
}
.hero__fig img{
  width:100%;aspect-ratio:1/1;object-fit:contain;
  padding:clamp(18px,3.4vw,40px);transition:opacity .3s var(--ease);
}
.hero__fig figcaption{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:12px 16px;border-top:1px solid var(--line);background:var(--bg-2);
  font-size:12px;
}
.hero__fig figcaption span{
  font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3);
}
.hero__fig figcaption b{font-size:13.5px;font-weight:700;color:var(--brand)}

.hero__thumbs{
  display:grid;grid-template-columns:repeat(6,1fr);gap:7px;margin-top:8px;
}
.hero__thumbs button{
  padding:0;aspect-ratio:1/1;background:#fff;
  border:1px solid var(--line);border-radius:3px;
  cursor:pointer;overflow:hidden;
  transition:border-color .2s var(--ease);
}
.hero__thumbs button img{
  width:100%;height:100%;object-fit:contain;padding:5px;opacity:.55;
  transition:opacity .2s var(--ease);
}
.hero__thumbs button:hover{border-color:var(--line-2)}
.hero__thumbs button:hover img{opacity:1}
.hero__thumbs button.on{border-color:var(--brand-2)}
.hero__thumbs button.on img{opacity:1}

/* ============================================================
   STATS
   ============================================================ */
.stats{background:var(--brand);color:#fff}
.stats__in{display:grid;grid-template-columns:repeat(4,1fr)}
.stats__i{
  padding:clamp(22px,3vw,34px) clamp(12px,2vw,26px);
  border-left:1px solid rgba(255,255,255,.14);
}
.stats__i:first-child{border-left:0;padding-left:0}
.stats__i b{
  display:block;font-size:clamp(24px,3.2vw,38px);font-weight:800;
  letter-spacing:-.03em;line-height:1;margin-bottom:8px;
  font-variant-numeric:tabular-nums;
}
.stats__i span{font-size:12.5px;color:rgba(255,255,255,.66)}

/* ============================================================
   产品网格
   ============================================================ */
.pgrid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));
  gap:clamp(16px,2vw,24px);
}
.pcard{
  display:flex;flex-direction:column;background:#fff;
  border:1px solid var(--line);border-radius:4px;overflow:hidden;
  transition:border-color .2s var(--ease),box-shadow .24s var(--ease),
             transform .24s var(--ease);
}
.pcard:hover{
  border-color:var(--line-2);transform:translateY(-3px);
  box-shadow:0 12px 32px rgba(27,58,92,.09);
}
.pcard__media{
  display:flex;align-items:center;justify-content:center;
  background:var(--bg-2);aspect-ratio:4/3;
  border-bottom:1px solid var(--line);overflow:hidden;
}
.pcard__media img{
  width:100%;height:100%;object-fit:contain;
  padding:clamp(14px,2vw,22px);
  transition:transform .32s var(--ease);
}
.pcard:hover .pcard__media img{transform:scale(1.06)}
.pcard__body{padding:16px 17px 18px;display:flex;flex-direction:column;gap:7px;flex:1}
.pcard__body h3{font-size:16.5px;font-weight:700;letter-spacing:-.015em}
.pcard__cn{font-size:12.5px;color:var(--ink-3)}
.pcard__desc{font-size:13px;color:var(--ink-3);line-height:1.62;flex:1}
.pcard__meta{
  display:flex;gap:14px;padding-top:10px;margin-top:auto;
  border-top:1px solid var(--line);font-size:11.5px;color:var(--ink-4);
}
.pcard__meta b{color:var(--brand);font-weight:700;font-variant-numeric:tabular-nums}
.pcard__link{
  font-size:13px;font-weight:600;color:var(--brand-2);
  display:inline-flex;align-items:center;gap:5px;margin-top:4px;
}
.pcard:hover .pcard__link{text-decoration:underline}

.more{text-align:center;margin-top:clamp(26px,3.4vw,38px)}
.more a{
  font-size:14.5px;font-weight:600;color:var(--brand-2);
  border-bottom:1px solid transparent;transition:border-color .18s;
}
.more a:hover{border-color:currentColor}

/* ============================================================
   WHY CHOOSE
   ============================================================ */
.why{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(268px,1fr));
  gap:1px;background:var(--line);border:1px solid var(--line);
  border-radius:4px;overflow:hidden;margin-bottom:24px;
}
.why__i{
  background:#fff;padding:clamp(22px,2.6vw,30px);
  display:flex;gap:14px;align-items:flex-start;
  transition:background .2s var(--ease);
}
.why__i:hover{background:#fafbfc}
.why__n{
  flex:0 0 30px;height:30px;border-radius:50%;
  background:var(--brand-lt);color:var(--brand);
  display:flex;align-items:center;justify-content:center;
  font-size:12.5px;font-weight:800;
}
.why__i h3{font-size:15.5px;margin-bottom:6px;letter-spacing:-.01em}
.why__i p{font-size:13.5px;color:var(--ink-3);line-height:1.65}
.why__note{
  font-size:13.5px;color:var(--ink-3);max-width:82ch;
  padding:16px 18px;background:#fff;border:1px solid var(--line);
  border-left:3px solid var(--brand-lt);border-radius:3px;line-height:1.7;
}

/* ============================================================
   ABOUT
   ============================================================ */
.about{
  display:grid;grid-template-columns:1.35fr 1fr;
  gap:clamp(30px,4.4vw,62px);align-items:start;
}
.about__txt p{font-size:15px;color:var(--ink-2);line-height:1.76}
.about__more{margin-top:16px}
.about__more a{font-size:14px;font-weight:600;color:var(--brand-2)}
.about__more a:hover{text-decoration:underline}

.about__card{
  background:var(--bg-2);border:1px solid var(--line);
  border-radius:4px;padding:clamp(20px,2.6vw,28px);
}
.about__card dl{display:grid;gap:1px}
.about__card dl>div{
  display:flex;justify-content:space-between;gap:14px;
  padding:11px 0;border-bottom:1px solid var(--line);
}
.about__card dl>div:last-child{border-bottom:0}
.about__card dt{
  font-size:11.5px;font-weight:700;letter-spacing:.09em;
  text-transform:uppercase;color:var(--ink-4);
}
.about__card dd{
  font-size:14px;font-weight:600;color:var(--brand);text-align:right;
}

/* ============================================================
   CAPABILITY BAND
   ============================================================ */
.caps{background:var(--brand);color:#fff;padding:clamp(46px,6vw,74px) 0}
.caps__tag{
  font-size:clamp(19px,2.4vw,27px);font-weight:700;
  letter-spacing:-.02em;text-align:center;margin-bottom:clamp(28px,3.6vw,44px);
}
.caps__grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:clamp(20px,2.6vw,34px);
}
.caps__i{border-top:2px solid var(--brand-lt);padding-top:18px}
.caps__i h3{font-size:15.5px;margin-bottom:8px}
.caps__i p{font-size:13.5px;color:rgba(255,255,255,.66);line-height:1.66}

/* ============================================================
   APPLICATIONS
   ============================================================ */
.apps{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(238px,1fr));
  gap:clamp(14px,1.8vw,20px);
}
.apps__i{
  border:1px solid var(--line);border-radius:4px;padding:20px 22px;
  background:#fff;transition:border-color .2s var(--ease);
}
.apps__i:hover{border-color:var(--brand-lt)}
.apps__i h3{
  font-size:15px;color:var(--brand);margin-bottom:4px;
  display:flex;align-items:baseline;justify-content:space-between;gap:10px;
}
.apps__i h3 b{
  font-size:19px;font-weight:800;font-variant-numeric:tabular-nums;
}
.apps__i p{font-size:12.5px;color:var(--ink-3);line-height:1.65}

/* ============================================================
   CTA
   ============================================================ */
.cta{background:var(--bg-2);border-top:1px solid var(--line);
  padding:clamp(40px,5vw,62px) 0}
.cta__in{
  display:grid;grid-template-columns:1fr auto;
  gap:clamp(24px,4vw,54px);align-items:center;
}
.cta h2{font-size:clamp(21px,2.8vw,30px);margin-bottom:10px}
.cta p{font-size:14.5px;color:var(--ink-3);max-width:62ch;line-height:1.7}

/* ============================================================
   FOOTER
   ============================================================ */
.ftr{background:#14263a;color:rgba(255,255,255,.72);
  padding:clamp(38px,4.6vw,58px) 0 0;font-size:13.5px}
.ftr__in{
  display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;
  gap:clamp(22px,3.2vw,44px);padding-bottom:clamp(26px,3.4vw,40px);
}
.ftr__col h4{
  font-size:12px;font-weight:700;letter-spacing:.12em;
  text-transform:uppercase;color:#fff;margin-bottom:14px;
}
.ftr__col ul{display:grid;gap:9px}
.ftr__col a{transition:color .18s var(--ease)}
.ftr__col a:hover{color:#fff}
.ftr__col p{line-height:1.75;font-size:13px}
.ftr__col p + p{margin-top:8px}
.brand--ftr .brand__mark{color:#fff;font-size:21px}
.brand--ftr .brand__sub{color:rgba(255,255,255,.42)}
.brand--ftr{margin-bottom:14px}

.ftr__base{
  display:flex;justify-content:space-between;align-items:center;gap:18px;
  flex-wrap:wrap;padding:18px 0;border-top:1px solid rgba(255,255,255,.11);
  font-size:12.5px;color:rgba(255,255,255,.5);
}
.ftr__links{display:flex;gap:18px}
.ftr__links a:hover{color:#fff}

/* ============================================================
   MOBILE NAV
   ============================================================ */
.mnav{
  position:fixed;inset:0;z-index:80;background:rgba(10,16,24,.55);
}
.mnav__panel{
  position:absolute;top:0;right:0;bottom:0;width:min(320px,84vw);
  background:#fff;padding:22px;overflow-y:auto;
  animation:slideIn .26s var(--ease);
}
@keyframes slideIn{from{transform:translateX(100%)}to{transform:none}}
.mnav__close{
  position:absolute;top:16px;right:18px;width:38px;height:38px;
  background:none;border:1px solid var(--line-2);border-radius:3px;
  font-size:20px;line-height:1;cursor:pointer;color:var(--ink);
}
.mnav__panel nav{display:grid;gap:0;margin-top:52px}
.mnav__panel nav a{
  padding:14px 2px;font-size:15.5px;font-weight:600;color:var(--ink-2);
  border-bottom:1px solid var(--line);
}
.mnav__panel nav a.on{color:var(--brand)}
.mnav__cta{margin-top:22px;display:block}

/* ============================================================
   商品详情/列表页相关（共用）
   ============================================================ */
.pagehead{
  background:var(--bg-2);border-bottom:1px solid var(--line);
  padding:clamp(28px,4vw,46px) 0;
}
.pagehead h1{font-size:clamp(24px,3.4vw,38px);letter-spacing:-.03em;margin-bottom:8px}
.pagehead p{font-size:15px;color:var(--ink-3);max-width:70ch;line-height:1.72}
.crumb{font-size:12.5px;color:var(--ink-4);margin-bottom:12px}
.crumb a:hover{color:var(--brand-2)}
.crumb span{margin:0 7px}

.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.fld{display:grid;gap:6px}
.fld>span{
  font-size:11.5px;font-weight:700;letter-spacing:.09em;
  text-transform:uppercase;color:var(--ink-3);
}
.fld input,.fld textarea,.fld select{
  width:100%;font-family:inherit;font-size:14.5px;color:var(--ink);
  padding:11px 13px;background:#fff;
  border:1px solid var(--line-2);border-radius:3px;
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.fld textarea{resize:vertical;min-height:104px}
.fld input:focus,.fld textarea:focus,.fld select:focus{
  outline:0;border-color:var(--brand-2);
  box-shadow:0 0 0 3px rgba(45,107,150,.1);
}
.fld.err input,.fld.err textarea,.fld.err select{border-color:var(--accent)}
.fld__msg{font-size:11.5px;color:var(--accent);display:none}
.fld.err .fld__msg{display:block}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media(max-width:1024px){
  .hero__in{grid-template-columns:1fr;gap:36px}
  .hero__media{max-width:480px}
  .about{grid-template-columns:1fr}
  .ftr__in{grid-template-columns:1fr 1fr;gap:30px}
}
@media(max-width:880px){
  .nav{display:none}
  .hdr__cta{display:none}
  .burger{display:flex}
  .hdr__in{gap:14px}
  .stats__in{grid-template-columns:1fr 1fr}
  .stats__i{border-left:1px solid rgba(255,255,255,.14);padding-left:20px}
  .stats__i:nth-child(odd){border-left:0;padding-left:0}
  .stats__i:nth-child(n+3){border-top:1px solid rgba(255,255,255,.14)}
  .cta__in{grid-template-columns:1fr}
  .cta__in .btn{justify-self:start}
}
@media(max-width:640px){
  .hdr__in{height:64px}
  .hero__facts{grid-template-columns:1fr;gap:13px}
  .hero__facts>div{display:flex;justify-content:space-between;align-items:baseline;gap:14px}
  .hero__facts div dt{margin-bottom:0}
  .pgrid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px}
  .pcard__body{padding:12px 13px 14px}
  .pcard__body h3{font-size:14.5px}
  .pcard__desc{display:none}
  .pcard__meta{flex-direction:column;gap:2px}
  .form-row{grid-template-columns:1fr}
  .ftr__in{grid-template-columns:1fr;gap:26px}
  .ftr__base{flex-direction:column;align-items:flex-start;gap:10px}
}

@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;transition-duration:.01ms !important;
  }
  .pcard:hover,.hero__thumbs button:hover{transform:none}
}