/* 绵阳艺固仪器仪表有限公司 — 蓝图/工程制图风格 */
:root{
  --paper:#f5f4ee;        /* 图纸米白 */
  --ink:#1e2a30;          /* 制图墨色 */
  --blue:#1d5a7a;         /* 主色：工程蓝图蓝，源自晒图蓝线 */
  --blue-dark:#143f57;
  --mark:#a75a35;         /* 标注棕红，低饱和，用于编号与强调 */
  --line:#c9cec9;         /* 细格线 */
  --soft:#e9ebe4;
  --fs-hero:clamp(2.2rem,5.2vw,3.6rem);
  --fs-h2:1.5rem;
  --fs-h3:1.08rem;
  --fs-body:1rem;
  --fs-small:.82rem;
  --sp:24px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Noto Serif SC","Songti SC","SimSun",serif;
  background:var(--paper);color:var(--ink);
  font-size:var(--fs-body);line-height:1.85;
  background-image:
    linear-gradient(rgba(29,90,122,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(29,90,122,.05) 1px,transparent 1px);
  background-size:32px 32px;
}
.wrap{max-width:1280px;margin:0 auto;padding:0 24px}
p,li{max-width:68ch}
a{color:var(--blue);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--mark)}
a:focus-visible,button:focus-visible{outline:2px solid var(--mark);outline-offset:2px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* 页头 */
.site-head{border-bottom:3px double var(--ink);background:var(--paper)}
.head-row{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:16px 24px;flex-wrap:wrap}
.brand img{display:block;height:32px;width:auto}
.site-head nav ul{display:flex;list-style:none;gap:8px;flex-wrap:wrap}
.site-head nav a{
  font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  font-size:.9rem;letter-spacing:.12em;color:var(--ink);text-decoration:none;
  padding:6px 10px;border-bottom:2px solid transparent;
}
.site-head nav a:hover{color:var(--blue);border-bottom-color:var(--blue)}
.site-head nav a[aria-current]{border-bottom-color:var(--mark);color:var(--blue-dark)}

/* 面包屑 */
.breadcrumb{
  font-family:"Noto Sans SC",sans-serif;font-size:12px;letter-spacing:.08em;
  color:#6b7a80;margin:16px 0;padding:0;max-width:none;
}
.breadcrumb a{color:#6b7a80}
.breadcrumb span{margin:0 6px;color:var(--line)}

/* 标题体系：粗黑无衬线 vs 宋体正文 */
h1,h2,h3{
  font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  line-height:1.3;color:var(--blue-dark);
}
h1{font-size:var(--fs-hero);font-weight:800;letter-spacing:.02em}
h2{font-size:var(--fs-h2);font-weight:700;border-left:6px solid var(--blue);padding-left:12px;margin:48px 0 16px}
h3{font-size:var(--fs-h3);font-weight:700;margin-top:16px}
.kicker{
  font-family:"Noto Sans SC",sans-serif;font-size:var(--fs-small);
  letter-spacing:.2em;color:var(--mark);text-transform:uppercase;margin-bottom:12px;
}
.lede{margin:16px 0 24px}

/* 首页：图文错位首屏 */
.hero{padding:48px 0}
.hero-offset{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:32px;align-items:start}
.hero-offset .hero-copy{padding-top:8px}
.hero-fig{border:1px solid var(--line);padding:12px;background:#fff}
.hero-fig img{width:100%;height:auto;display:block}
.actions{margin-top:24px}

/* 关于页：标题带图分栏 */
.hero-side{display:grid;grid-template-columns:minmax(0,3fr) minmax(0,2fr);gap:32px;align-items:center}
.hero-side figure{border:1px solid var(--line);padding:12px;background:#fff}
.hero-side img{width:100%;height:auto;display:block}
.hero-rule{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:48px 0}
.hero-band{border-top:6px solid var(--blue);border-bottom:1px solid var(--line);padding:48px 0}
.wide-fig{margin-top:24px;border:1px solid var(--line);padding:12px;background:#fff}
.wide-fig img{width:100%;height:auto;display:block}

/* 按钮 */
.btn{
  display:inline-block;font-family:"Noto Sans SC",sans-serif;font-weight:700;
  letter-spacing:.1em;font-size:.95rem;text-decoration:none;
  background:var(--blue);color:#fff;padding:12px 24px;border:2px solid var(--blue);
}
.btn:hover{background:var(--blue-dark);border-color:var(--blue-dark);color:#fff}
.btn.ghost{background:transparent;color:var(--blue)}
.btn.ghost:hover{background:var(--blue);color:#fff}

/* 能力区：主叙述+左侧编号，非卡片 */
.cap-list{margin-top:24px}
.cap{border-top:1px solid var(--ink);padding:24px 0 24px 64px;position:relative;max-width:100%}
.cap:nth-child(odd){background:rgba(29,90,122,.035)}
.cap h3::before{
  content:"0" counter(cap)" /";counter-increment:cap;
  position:absolute;left:0;top:26px;
  font-family:"Noto Sans SC",sans-serif;font-size:var(--fs-small);
  letter-spacing:.15em;color:var(--mark);
}
.cap-list{counter-reset:cap}
.cap p{max-width:76ch}

/* 九宫格 */
.items{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;margin:24px 0}
.item{border:1px solid var(--line);background:#fff;padding:16px}
.item img{width:100%;height:auto;aspect-ratio:4/3;object-fit:cover;display:block;border-bottom:1px solid var(--line);margin-bottom:12px}
.item h2,.item h3{margin-top:0;font-size:var(--fs-h3)}
.item p{font-size:var(--fs-small);line-height:1.7}
.item ul{margin:8px 0 0 1.2em;font-size:var(--fs-small)}
@media(max-width:760px){.items{grid-template-columns:minmax(0,1fr)}}
@media(min-width:761px) and (max-width:1000px){.items{grid-template-columns:repeat(2,minmax(0,1fr))}}

/* 流程：横向标尺 */
.steps{list-style:none;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;margin-top:24px;counter-reset:step}
.steps li{border-top:3px solid var(--ink);padding-top:12px;position:relative}
.steps .num{
  font-family:"Noto Sans SC",sans-serif;font-weight:800;font-size:1.6rem;
  color:var(--mark);display:block;letter-spacing:.05em;
}
.steps h3{margin:4px 0 8px}
.steps p{font-size:var(--fs-small);max-width:none}
@media(max-width:900px){.steps{grid-template-columns:minmax(0,1fr)}}

/* FAQ */
.faq-block dl,.faq-list h2~h3{margin-top:8px}
.faq-block dt{font-family:"Noto Sans SC",sans-serif;font-weight:700;color:var(--blue-dark);margin-top:16px;border-bottom:1px dashed var(--line);padding-bottom:4px}
.faq-block dd{margin:8px 0 0 0;max-width:76ch}
.faq-list h3{border-left:4px solid var(--mark);padding-left:12px}
.faq-list p{margin:8px 0 24px;max-width:76ch}

/* 关于页四栏 */
.about-cols{columns:2;column-gap:48px;margin-top:24px}
.about-cols .col{break-inside:avoid;margin-bottom:24px}
.about-cols p{max-width:none}
@media(max-width:900px){.about-cols{columns:1}}

/* 对比表 */
table{width:100%;border-collapse:collapse;margin:16px 0;font-size:var(--fs-small);background:#fff}
caption{font-family:"Noto Sans SC",sans-serif;text-align:left;color:var(--mark);letter-spacing:.1em;padding-bottom:8px}
th,td{border:1px solid var(--line);padding:8px 12px;text-align:left;vertical-align:top}
th{background:var(--soft);font-family:"Noto Sans SC",sans-serif;font-weight:700}

/* CTA */
.cta{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,2fr);gap:32px;align-items:center;border:1px solid var(--ink);padding:32px;margin:48px 0;background:#fff}
.cta figure{border-right:1px solid var(--line);padding-right:24px}
.cta img{width:100%;height:auto;display:block}
@media(max-width:760px){.cta{grid-template-columns:minmax(0,1fr)}.cta figure{border-right:none;padding:0}}

/* 联系 */
.mail a{font-family:"Noto Sans SC",sans-serif;font-size:1.4rem;font-weight:700}
.contact-block{border:1px solid var(--line);padding:24px;margin:24px 0;background:#fff}

.sec-note,.sec-more{color:#6b7a80;font-size:var(--fs-small)}
.guide h2{margin-top:40px}
.guide .lede{max-width:72ch}

/* 页脚 */
.site-foot{border-top:3px double var(--ink);margin-top:64px;background:var(--soft)}
.foot-row{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;padding:24px;
  font-family:"Noto Sans SC",sans-serif;font-size:var(--fs-small);color:#4a5a60}
.foot-row nav a{color:#4a5a60;margin:0 4px}

/* 首屏与正文拉开字重/字号差距已由 h1(var(--fs-hero),800) 与正文(serif) 实现 */
@media(max-width:900px){
  .hero-offset,.hero-side{grid-template-columns:minmax(0,1fr)}
  .head-row{flex-direction:column;align-items:flex-start}
}