/* =========================================================
   四川臻科铁路机车有限公司  官网样式
   纯静态站，无任何外部依赖（不加载谷歌字体/第三方CDN）
   ========================================================= */

:root{
  --deep:#0B2545;        /* 深蓝底 */
  --deep2:#123A66;       /* 深蓝浅一档 */
  --blue:#1B5FAA;        /* 主色 */
  --blue-l:#E8F0FA;      /* 主色淡底 */
  --orange:#FF7A1A;      /* 强调色 */
  --orange-l:#FFF2E7;
  --green:#22A06B;
  --text:#1A2433;
  --sub:#5B6B80;
  --line:#E3E9F2;
  --bg:#F5F7FA;
  --white:#fff;
  --radius:14px;
  --shadow:0 6px 24px rgba(11,37,69,.08);
  --shadow-lg:0 14px 40px rgba(11,37,69,.14);
  --font:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans CN",sans-serif;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font);
  color:var(--text);
  background:var(--bg);
  line-height:1.75;
  font-size:16px;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button,input,textarea,select{font-family:inherit;font-size:inherit}

.container{width:100%;max-width:1180px;margin:0 auto;padding:0 20px}

/* ---------------- 顶部导航 ---------------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(11,37,69,.96);
  backdrop-filter:blur(10px);
  border-bottom:1px solid rgba(255,255,255,.08);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:70px}
.brand{display:flex;align-items:center;gap:12px;color:#fff}
.brand-mark{
  width:42px;height:42px;border-radius:11px;flex:0 0 42px;
  background:linear-gradient(135deg,#FF8A2B,#FF6A00);
  display:flex;align-items:center;justify-content:center;
  font-weight:800;font-size:19px;color:#fff;letter-spacing:-1px;
  box-shadow:0 4px 14px rgba(255,122,26,.4);
}
.brand-txt strong{display:block;font-size:17px;font-weight:800;letter-spacing:.5px;line-height:1.3}
.brand-txt span{display:block;font-size:11.5px;color:rgba(255,255,255,.6);letter-spacing:.6px;line-height:1.4}

.nav-links{display:flex;align-items:center;gap:30px}
.nav-links a{
  color:rgba(255,255,255,.82);font-size:15px;font-weight:500;
  padding:6px 0;position:relative;transition:color .2s;
}
.nav-links a:hover,.nav-links a.active{color:#fff}
.nav-links a.active::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;height:3px;
  border-radius:2px;background:linear-gradient(90deg,#FF8A2B,#FF6A00);
}
.nav-cta{
  display:inline-flex;align-items:center;gap:7px;
  background:linear-gradient(135deg,#FF8A2B,#FF6A00);
  color:#fff!important;font-weight:700;font-size:14.5px;
  padding:10px 20px;border-radius:10px;
  box-shadow:0 6px 18px rgba(255,122,26,.32);
  transition:transform .2s,box-shadow .2s;
}
.nav-cta:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(255,122,26,.42)}

.burger{display:none;width:42px;height:42px;border-radius:10px;background:rgba(255,255,255,.1);
  border:0;cursor:pointer;position:relative}
.burger i{position:absolute;left:12px;right:12px;height:2px;background:#fff;border-radius:2px;transition:.25s}
.burger i:nth-child(1){top:14px}
.burger i:nth-child(2){top:20px}
.burger i:nth-child(3){top:26px}
.burger.on i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.burger.on i:nth-child(2){opacity:0}
.burger.on i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* ---------------- 通用按钮 ---------------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:14px 30px;border-radius:11px;font-size:16px;font-weight:700;
  border:0;cursor:pointer;transition:transform .2s,box-shadow .2s,background .2s;
  line-height:1.2;
}
.btn-primary{background:linear-gradient(135deg,#FF8A2B,#FF6A00);color:#fff;
  box-shadow:0 8px 22px rgba(255,122,26,.34)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(255,122,26,.44)}
.btn-ghost{background:rgba(255,255,255,.12);color:#fff;border:1px solid rgba(255,255,255,.32)}
.btn-ghost:hover{background:rgba(255,255,255,.2)}
.btn-line{background:#fff;color:var(--blue);border:1.5px solid var(--blue)}
.btn-line:hover{background:var(--blue-l)}
.btn-block{width:100%}

/* ---------------- 首屏 ---------------- */
.hero{
  position:relative;overflow:hidden;
  background:
    radial-gradient(1200px 500px at 78% -8%,rgba(255,122,26,.24),transparent 62%),
    radial-gradient(900px 460px at 8% 108%,rgba(27,95,170,.5),transparent 60%),
    linear-gradient(150deg,#0B2545 0%,#123A66 58%,#0E2A4A 100%);
  color:#fff;padding:86px 0 0;
}
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background-image:linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);
  background-size:46px 46px;
  mask-image:radial-gradient(900px 420px at 60% 30%,#000,transparent 82%);
  -webkit-mask-image:radial-gradient(900px 420px at 60% 30%,#000,transparent 82%);
}
.hero .container{position:relative;z-index:2}
.hero-inner{display:grid;grid-template-columns:1.08fr .92fr;gap:52px;align-items:center}
.hero-tag{
  display:inline-flex;align-items:center;gap:9px;
  background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2);
  padding:7px 16px;border-radius:100px;font-size:13.5px;color:rgba(255,255,255,.9);
  margin-bottom:24px;letter-spacing:.3px;
}
.hero-tag b{color:#FFB274;font-weight:700}
.hero h1{
  font-size:52px;line-height:1.22;font-weight:800;letter-spacing:-.5px;margin-bottom:22px;
}
.hero h1 em{
  font-style:normal;
  background:linear-gradient(120deg,#FFB274,#FF7A1A);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-p{font-size:17.5px;color:rgba(255,255,255,.82);max-width:560px;margin-bottom:18px}
.hero-keys{display:flex;flex-wrap:wrap;gap:12px;margin:26px 0 32px}
.hero-keys span{
  font-size:14px;color:rgba(255,255,255,.9);
  background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);
  padding:7px 14px;border-radius:8px;
}
.hero-keys span b{color:#FFB274}
.hero-btns{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:14px}
.hero-note{font-size:13.5px;color:rgba(255,255,255,.62)}

.hero-card{
  background:rgba(255,255,255,.07);
  border:1px solid rgba(255,255,255,.16);
  border-radius:20px;padding:28px;
  backdrop-filter:blur(8px);
}
.hero-card h3{font-size:16px;font-weight:700;margin-bottom:6px;color:#fff}
.hero-card .hc-sub{font-size:13px;color:rgba(255,255,255,.6);margin-bottom:20px}
.hc-row{
  display:flex;align-items:center;gap:14px;
  padding:13px 0;border-bottom:1px dashed rgba(255,255,255,.14);
}
.hc-row:last-child{border-bottom:0;padding-bottom:0}
.hc-ico{
  width:38px;height:38px;flex:0 0 38px;border-radius:10px;
  background:rgba(255,122,26,.18);border:1px solid rgba(255,122,26,.3);
  display:flex;align-items:center;justify-content:center;font-size:17px;
}
.hc-txt strong{display:block;font-size:14.5px;font-weight:700;color:#fff;line-height:1.5}
.hc-txt span{display:block;font-size:12.5px;color:rgba(255,255,255,.62);line-height:1.6}

.hero-strip{
  position:relative;z-index:2;margin-top:64px;
  border-top:1px solid rgba(255,255,255,.12);
  display:grid;grid-template-columns:repeat(4,1fr);
}
.hero-strip div{padding:22px 20px;text-align:center;border-right:1px solid rgba(255,255,255,.1)}
.hero-strip div:last-child{border-right:0}
.hero-strip strong{display:block;font-size:24px;font-weight:800;color:#FFB274;letter-spacing:-.5px}
.hero-strip span{font-size:13px;color:rgba(255,255,255,.68)}

/* ---------------- 区块 ---------------- */
.section{padding:82px 0}
.section-gray{background:var(--white)}
.sec-head{text-align:center;max-width:760px;margin:0 auto 52px}
.sec-tag{
  display:inline-block;font-size:13px;font-weight:700;letter-spacing:2px;
  color:var(--blue);background:var(--blue-l);padding:6px 15px;border-radius:100px;margin-bottom:16px;
}
.sec-head h2{font-size:36px;line-height:1.3;font-weight:800;letter-spacing:-.4px;margin-bottom:16px}
.sec-head p{font-size:16.5px;color:var(--sub)}

.grid{display:grid;gap:22px}
.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:30px;transition:transform .25s,box-shadow .25s,border-color .25s;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:#CFE0F3}
.card-ico{
  width:52px;height:52px;border-radius:13px;margin-bottom:18px;
  background:var(--blue-l);display:flex;align-items:center;justify-content:center;font-size:24px;
}
.card h3{font-size:19px;font-weight:700;margin-bottom:10px}
.card p{font-size:14.5px;color:var(--sub)}

/* 机型卡 */
.machine{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:26px;position:relative;overflow:hidden;
  transition:transform .25s,box-shadow .25s,border-color .25s;
}
.machine:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:#CFE0F3}
.machine::after{
  content:"";position:absolute;right:-30px;top:-30px;width:120px;height:120px;border-radius:50%;
  background:radial-gradient(circle,rgba(27,95,170,.1),transparent 70%);
}
.machine-code{
  display:inline-flex;align-items:center;justify-content:center;
  min-width:56px;height:38px;padding:0 14px;border-radius:10px;
  background:linear-gradient(135deg,#1B5FAA,#123A66);color:#fff;
  font-weight:800;font-size:17px;letter-spacing:.5px;margin-bottom:16px;
}
.machine-code.orange{background:linear-gradient(135deg,#FF8A2B,#FF6A00)}
.machine h3{font-size:18px;font-weight:700;margin-bottom:8px}
.machine p{font-size:14px;color:var(--sub);margin-bottom:14px;min-height:44px}
.machine .m-tags{display:flex;flex-wrap:wrap;gap:7px}
.machine .m-tags span{
  font-size:12px;color:var(--blue);background:var(--blue-l);
  padding:4px 10px;border-radius:6px;
}
.machine .m-badge{
  position:absolute;right:20px;top:22px;font-size:11.5px;font-weight:700;
  color:var(--orange);background:var(--orange-l);padding:4px 10px;border-radius:6px;
}

/* 步骤 */
.steps{counter-reset:s;display:grid;gap:18px}
.step{
  display:flex;gap:20px;background:#fff;border:1px solid var(--line);
  border-radius:var(--radius);padding:24px 26px;position:relative;
}
.step-no{
  flex:0 0 46px;height:46px;border-radius:50%;
  background:linear-gradient(135deg,#1B5FAA,#123A66);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:18px;
}
.step h3{font-size:17.5px;font-weight:700;margin-bottom:7px}
.step p{font-size:14.5px;color:var(--sub)}
.step .s-tip{
  display:inline-block;margin-top:10px;font-size:13px;color:var(--orange);
  background:var(--orange-l);padding:5px 12px;border-radius:7px;
}

/* 条件表 */
.table-wrap{overflow-x:auto;background:#fff;border:1px solid var(--line);border-radius:var(--radius)}
table{width:100%;border-collapse:collapse;min-width:640px}
th,td{padding:15px 20px;text-align:left;font-size:14.5px;border-bottom:1px solid var(--line)}
th{background:#F0F4FA;font-weight:700;color:var(--deep);font-size:14px;white-space:nowrap}
td:first-child{font-weight:700;color:var(--deep);white-space:nowrap;width:150px}
tbody tr:last-child td{border-bottom:0}
tbody tr:hover{background:#FAFCFF}

/* 提示条 */
.notice{
  display:flex;gap:14px;background:var(--orange-l);border:1px solid #FFD9B8;
  border-left:4px solid var(--orange);border-radius:10px;padding:18px 22px;
  font-size:14.5px;color:#8A4A12;line-height:1.8;
}
.notice b{color:#B85C00}
.notice-blue{background:var(--blue-l);border-color:#C6DBF5;border-left-color:var(--blue);color:#1B4B7F}
.notice-blue b{color:var(--blue)}

/* 数据条 */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.stat{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 22px;text-align:center;
}
.stat strong{display:block;font-size:34px;font-weight:800;color:var(--blue);letter-spacing:-1px;line-height:1.2}
.stat strong em{font-style:normal;font-size:17px;font-weight:700;margin-left:2px}
.stat span{font-size:13.5px;color:var(--sub)}

/* FAQ */
.faq{display:grid;gap:14px}
details{
  background:#fff;border:1px solid var(--line);border-radius:12px;
  padding:0 24px;overflow:hidden;transition:border-color .2s;
}
details[open]{border-color:#CFE0F3;box-shadow:var(--shadow)}
summary{
  list-style:none;cursor:pointer;padding:20px 0;
  font-size:16px;font-weight:700;display:flex;align-items:center;justify-content:space-between;gap:16px;
}
summary::-webkit-details-marker{display:none}
summary::after{
  content:"+";font-size:22px;font-weight:400;color:var(--blue);
  flex:0 0 26px;text-align:center;transition:transform .2s;
}
details[open] summary::after{content:"−";transform:rotate(180deg)}
details .faq-body{padding:0 0 22px;font-size:14.5px;color:var(--sub);border-top:1px solid var(--line);padding-top:18px}

/* 页面头（子页） */
.page-head{
  background:
    radial-gradient(900px 380px at 82% -20%,rgba(255,122,26,.22),transparent 60%),
    linear-gradient(150deg,#0B2545,#123A66);
  color:#fff;padding:64px 0 58px;position:relative;overflow:hidden;
}
.page-head::before{
  content:"";position:absolute;inset:0;opacity:.45;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:44px 44px;
}
.page-head .container{position:relative;z-index:2}
.crumb{font-size:13.5px;color:rgba(255,255,255,.6);margin-bottom:14px}
.crumb a:hover{color:#fff}
.page-head h1{font-size:40px;font-weight:800;letter-spacing:-.4px;margin-bottom:14px;line-height:1.28}
.page-head p{font-size:16.5px;color:rgba(255,255,255,.78);max-width:700px}

/* 联系 */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:26px}
.contact-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px}
.contact-item{display:flex;gap:16px;padding:18px 0;border-bottom:1px dashed var(--line)}
.contact-item:last-child{border-bottom:0;padding-bottom:0}
.contact-item .ci-ico{
  width:44px;height:44px;flex:0 0 44px;border-radius:12px;background:var(--blue-l);
  display:flex;align-items:center;justify-content:center;font-size:20px;
}
.contact-item strong{display:block;font-size:13px;color:var(--sub);font-weight:600;margin-bottom:3px}
.contact-item div p{font-size:16.5px;font-weight:700;color:var(--deep);word-break:break-all}
.qr-box{
  width:180px;height:180px;border-radius:14px;border:2px dashed #C6DBF5;
  background:var(--blue-l);display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:8px;color:var(--blue);font-size:13px;text-align:center;padding:14px;
}
.qr-box b{font-size:15px}

.cta-band{
  background:linear-gradient(135deg,#0B2545,#16406F);
  border-radius:20px;padding:52px;color:#fff;text-align:center;position:relative;overflow:hidden;
}
.cta-band::before{
  content:"";position:absolute;right:-70px;top:-70px;width:280px;height:280px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,122,26,.28),transparent 68%);
}
.cta-band h2{font-size:32px;font-weight:800;margin-bottom:14px;position:relative}
.cta-band p{font-size:16.5px;color:rgba(255,255,255,.78);margin-bottom:28px;position:relative}
.cta-band .btn{position:relative}

/* 页脚 */
.site-footer{background:#08192F;color:rgba(255,255,255,.66);padding:60px 0 0;font-size:14px}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:36px;padding-bottom:44px;
  border-bottom:1px solid rgba(255,255,255,.1)}
.site-footer h4{color:#fff;font-size:15px;font-weight:700;margin-bottom:18px;letter-spacing:.3px}
.site-footer ul li{margin-bottom:11px}
.site-footer a{transition:color .2s}
.site-footer a:hover{color:#FFB274}
.foot-brand{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.foot-brand .brand-mark{width:38px;height:38px;font-size:17px;flex:0 0 38px;border-radius:10px}
.foot-brand strong{color:#fff;font-size:15.5px;font-weight:800;line-height:1.4}
.foot-about{font-size:13.5px;line-height:1.9;color:rgba(255,255,255,.58)}
.foot-bottom{
  padding:22px 0;display:flex;flex-wrap:wrap;gap:12px;
  align-items:center;justify-content:space-between;font-size:13px;color:rgba(255,255,255,.5);
}
.foot-bottom .fb-left{display:flex;flex-wrap:wrap;gap:6px 18px;align-items:center}
.foot-bottom a{color:rgba(255,255,255,.66)}
.foot-bottom a:hover{color:#FFB274}
.beian-link{display:inline-flex;align-items:center;gap:6px}
.disclaim{font-size:12.5px;color:rgba(255,255,255,.42);line-height:1.9;
  padding:0 0 26px;max-width:900px}

/* 悬浮咨询 */
.float-btn{
  position:fixed;right:22px;bottom:26px;z-index:90;
  display:flex;align-items:center;gap:9px;
  background:linear-gradient(135deg,#FF8A2B,#FF6A00);color:#fff;font-weight:700;font-size:15px;
  padding:14px 22px;border-radius:100px;box-shadow:0 10px 28px rgba(255,122,26,.42);
  transition:transform .2s;
}
.float-btn:hover{transform:translateY(-3px)}

/* 滚动进入动画：默认内容始终可见（避免 JS 未执行时白屏，也利于搜索引擎抓取）。
   想开动画时由 .js-anim 才隐藏 —— 默认不加这个类。 */
.reveal{opacity:1;transform:none}
html.js-anim .reveal{opacity:0;transform:translateY(22px)}
html.js-anim .reveal.in{opacity:1;transform:none;transition:opacity .6s ease,transform .6s ease}

/* ---------------- 响应式 ---------------- */
@media (max-width:1000px){
  .hero-inner{grid-template-columns:1fr;gap:40px}
  .hero h1{font-size:42px}
  .foot-grid{grid-template-columns:1fr 1fr}
  .g4{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:820px){
  .nav-links{
    position:fixed;top:70px;left:0;right:0;background:#0B2545;
    flex-direction:column;gap:0;padding:8px 0 16px;
    border-bottom:1px solid rgba(255,255,255,.1);
    transform:translateY(-140%);transition:transform .28s ease;
    max-height:calc(100vh - 70px);overflow-y:auto;
  }
  .nav-links.open{transform:none}
  .nav-links a{padding:15px 22px;width:100%;font-size:16px;border-bottom:1px solid rgba(255,255,255,.06)}
  .nav-links a.active::after{display:none}
  .nav-links a.active{color:#FFB274}
  .nav-links .nav-cta{margin:16px 22px 4px;width:calc(100% - 44px)}
  .burger{display:block}
  .g3,.g2{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .contact-grid{grid-template-columns:1fr}
  .hero-strip{grid-template-columns:repeat(2,1fr)}
  .hero-strip div:nth-child(2){border-right:0}
  .hero-strip div:nth-child(1),.hero-strip div:nth-child(2){border-bottom:1px solid rgba(255,255,255,.1)}
  .section{padding:58px 0}
  .sec-head h2{font-size:28px}
  .sec-head{margin-bottom:38px}
  .page-head h1{font-size:30px}
  .page-head{padding:48px 0 44px}
  .hero{padding-top:56px}
  .hero h1{font-size:34px}
  .hero-p{font-size:16px}
  .cta-band{padding:36px 22px}
  .cta-band h2{font-size:25px}
  .float-btn{right:14px;bottom:18px;padding:12px 18px;font-size:14px}
}
@media (max-width:520px){
  .g4{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr;gap:26px}
  .stats{grid-template-columns:1fr 1fr;gap:12px}
  .stat strong{font-size:27px}
  .hero h1{font-size:29px}
  .sec-head h2{font-size:24px}
  .card,.machine{padding:22px}
  .brand-txt strong{font-size:15px}
  .brand-txt span{font-size:10.5px}
  body{font-size:15.5px}
}

/* 手机上把数据表转成卡片（横向滚动体验差，卡片更好读） */
@media (max-width:700px){
  .table-wrap{background:transparent;border:0;overflow-x:visible;border-radius:0}
  table{min-width:0}
  thead{display:none}
  tbody,tr,td{display:block;width:100%}
  tbody tr{background:#fff;border:1px solid var(--line);border-radius:12px;margin-bottom:14px;overflow:hidden}
  tbody tr:hover{background:#fff}
  td{border-bottom:1px solid var(--line);padding:12px 16px;font-size:14.5px}
  td:first-child{width:auto;white-space:normal;background:#F0F4FA;font-size:13.5px;letter-spacing:.3px;color:var(--deep)}
  tbody tr td:last-child{border-bottom:0}
  td[rowspan]{background:#E8F0FA;font-weight:700}
}

/* 打印 */
@media print{
  .site-header,.float-btn,.hero-btns,.cta-band{display:none}
  body{background:#fff}
}