/* ===== 华铁钢材 · 官网样式 ===== */
:root{
  --red:#c8102e;
  --red-d:#a30c25;
  --yellow:#ffd200;
  --ink:#161b26;
  --muted:#5f6a7d;
  --line:#e4e8ef;
  --bg:#fff;
  --soft:#f4f6f9;
  --max:1100px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:system-ui,-apple-system,"Microsoft YaHei","PingFang SC","Helvetica Neue",Arial,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{width:100%;max-width:var(--max);margin:0 auto;padding:0 20px}

/* ---- 顶部信息条 ---- */
.topbar{position:sticky;top:0;z-index:20;background:rgba(22,27,38,.96);color:#fff}
.topbar__in{display:flex;align-items:center;justify-content:space-between;height:58px}
.brand{display:flex;align-items:center;gap:9px;font-weight:700;letter-spacing:.5px;font-size:17px}
.brand__mark{display:grid;place-items:center;width:27px;height:27px;border-radius:7px;background:var(--red);color:var(--yellow);font-size:14px;font-weight:800}
.topbar__tel{font-weight:700;font-size:15px;color:var(--yellow);letter-spacing:.5px}
.topbar__tel:hover{text-decoration:underline}

/* ---- 首屏 ---- */
.hero{
  position:relative;color:#fff;padding:100px 0 76px;
  background:
    linear-gradient(180deg,rgba(15,18,26,.80),rgba(15,18,26,.60) 58%,rgba(15,18,26,.90)),
    url("../assets/site.jpg") center/cover no-repeat;
}
.hero__in{max-width:780px}
.hero__eyebrow{
  display:inline-block;font-size:13px;letter-spacing:2px;color:var(--yellow);
  border:1px solid rgba(255,210,0,.5);border-radius:999px;padding:4px 14px;margin-bottom:20px;
}
.hero__title{font-size:clamp(28px,5vw,52px);line-height:1.25;font-weight:800;letter-spacing:1px}
.hero__title em{font-style:normal;color:var(--yellow)}
.hero__sub{margin-top:18px;font-size:clamp(15px,1.8vw,18px);color:rgba(255,255,255,.9);max-width:640px}
.hero__btns{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.hero__tags{display:flex;flex-wrap:wrap;gap:10px;list-style:none;margin-top:32px}
.hero__tags li{font-size:14px;padding:6px 14px;border-radius:999px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.22)}

/* ---- 经营关键词条 ---- */
.keywords{background:var(--ink);color:#fff;padding:16px 0}
.keywords__in{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.keywords__label{flex:none;font-weight:800;color:var(--yellow);font-size:14px;letter-spacing:1px}
.keywords__list{list-style:none;display:flex;flex-wrap:wrap;gap:9px}
.keywords__list li{font-size:13.5px;padding:5px 13px;border-radius:999px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16)}

/* ---- 按钮 ---- */
.btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 26px;border-radius:10px;font-weight:700;font-size:16px;transition:.2s;border:2px solid transparent}
.btn--primary{background:var(--red);color:#fff;box-shadow:0 8px 22px rgba(200,16,46,.35)}
.btn--primary:hover{background:var(--red-d);transform:translateY(-1px)}
.btn--ghost{border-color:rgba(255,255,255,.55);color:#fff}
.btn--ghost:hover{background:rgba(255,255,255,.14)}
.btn--lg{padding:16px 40px;font-size:17px}

/* ---- 区块 ---- */
.section{padding:74px 0}
.section--soft{background:var(--soft)}
.section__title{font-size:clamp(22px,3vw,30px);font-weight:800;letter-spacing:.5px;position:relative;padding-left:16px}
.section__title::before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:6px;height:26px;border-radius:3px;background:var(--red)}
.section__lead{margin-top:12px;color:var(--muted);max-width:660px}

/* ---- 网格 ---- */
.grid{display:grid;gap:18px;margin-top:34px}
.grid--products{grid-template-columns:repeat(3,1fr)}
.grid--service{grid-template-columns:repeat(3,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px 22px;transition:.22s}
.card:hover{border-color:#cfd6e2;box-shadow:0 12px 28px rgba(20,30,50,.08);transform:translateY(-3px)}
.card h3{font-size:18px;font-weight:800}
.card h3::after{content:"";display:block;width:26px;height:3px;border-radius:2px;background:var(--red);margin-top:9px}
.card p{color:var(--muted);font-size:15px;margin-top:10px}

.serv{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px;display:flex;align-items:center;gap:14px}
.serv__no{font-size:20px;font-weight:800;color:var(--red);opacity:.85;font-variant-numeric:tabular-nums}
.serv h3{font-size:17px;font-weight:700}

.why{list-style:none;display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:32px}
.why li{background:#fff;border:1px solid var(--line);border-left:4px solid var(--red);border-radius:12px;padding:18px 20px}
.why b{display:block;font-size:17px;margin-bottom:6px}
.why span{color:var(--muted);font-size:15px}

/* ---- 关于 ---- */
.about{display:grid;grid-template-columns:1.12fr .88fr;gap:34px;margin-top:34px;align-items:start}
.about__text p{color:#333c4c;margin-bottom:14px}
.facts{margin-top:22px;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#fff}
.facts div{display:flex;gap:14px;padding:12px 16px;border-bottom:1px solid var(--line)}
.facts div:last-child{border-bottom:0}
.facts dt{flex:0 0 132px;color:var(--muted);font-size:14px}
.facts dd{font-size:14px;color:var(--ink);font-weight:600}
.about__media{display:grid;gap:18px}
.about__media figure{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#fff}
.about__media img{width:100%;height:auto}
.about__media figure:first-child img{height:340px;object-fit:cover}
.about__media figure:last-child img{height:auto}
.about__media figcaption{font-size:13px;color:var(--muted);text-align:center;padding:10px;border-top:1px solid var(--line)}

/* ---- 联系 ---- */
.contact{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:34px}
.contact__item{background:#fff;border:1px solid var(--line);border-radius:14px;padding:26px 22px;text-align:center}
.contact__ico{display:grid;place-items:center;width:44px;height:44px;margin:0 auto 14px;border-radius:12px;background:var(--red);color:#fff;font-weight:800}
.contact__label{font-size:13px;color:var(--muted);letter-spacing:1px}
.contact__val{display:block;font-size:22px;font-weight:800;color:var(--ink);margin-top:6px}
.contact__val--sm{font-size:16px;line-height:1.6}
a.contact__val:hover{color:var(--red)}
.contact__note{margin-top:10px;font-size:13px;color:var(--muted)}
.contact__cta{text-align:center;margin-top:34px}

/* ---- 页脚 ---- */
.footer{background:var(--ink);color:rgba(255,255,255,.72);padding:34px 0;text-align:center;font-size:14px}
.footer__lic{margin-top:6px;color:rgba(255,255,255,.5)}

/* ---- 移动端拨打条 ---- */
.callbar{display:none}

@media(max-width:900px){
  .grid--products,.grid--service{grid-template-columns:repeat(2,1fr)}
  .contact{grid-template-columns:1fr}
  .about{grid-template-columns:1fr}
  .why{grid-template-columns:1fr}
}
@media(max-width:640px){
  .hero{padding:72px 0 56px}
  .section{padding:54px 0}
  .grid--products,.grid--service{grid-template-columns:1fr}
  .facts div{flex-direction:column;gap:2px}
  .facts dt{flex-basis:auto}
  body{padding-bottom:64px}
  .callbar{
    display:flex;align-items:center;justify-content:center;position:fixed;left:0;right:0;bottom:0;
    height:56px;background:var(--red);color:#fff;font-weight:800;font-size:16px;letter-spacing:.5px;
    z-index:30;box-shadow:0 -4px 18px rgba(0,0,0,.18);
  }
}