/* 沙影科技官网 · 全站样式（唯一文件，所有页面共用） */
:root{--color-bg:#0a1929;--color-bg-soft:#0f2238;--color-bg-card:#142a45;--color-border:rgba(0,212,255,.15);--color-border-hover:rgba(0,212,255,.45);--color-primary:#00d4ff;--color-primary-soft:#4dd0e1;--color-text:#e6f7ff;--color-text-soft:#8aa4c2;--color-text-mute:#5a7a99;--shadow-glow:0 0 40px rgba(0,212,255,.15);--radius:12px;--max-width:1200px;--font-sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Helvetica,Arial,sans-serif}*{margin:0;padding:0;box-sizing:border-box}body,html{background:var(--color-bg);color:var(--color-text);font-family:var(--font-sans);font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden}a{text-decoration:none}a,button{color:inherit}button{font-family:inherit;cursor:pointer;border:none;background:none}img{max-width:100%;display:block}.container{width:100%;max-width:var(--max-width);margin:0 auto;padding:0 24px}.site-header{position:-webkit-sticky;position:sticky;top:0;z-index:100;background:rgba(10,25,41,.85);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--color-border)}.site-header .container{justify-content:space-between;height:68px}.brand,.site-header .container{display:flex;align-items:center}.brand{gap:12px;font-size:18px;font-weight:600;letter-spacing:.5px}.brand-logo{height:44px;width:auto;border-radius:6px}.nav{display:flex;gap:32px}.nav-link{color:var(--color-text-soft);font-size:15px;transition:color .2s;white-space:nowrap}.nav-link.is-active,.nav-link:hover{color:var(--color-primary)}.hero{position:relative;min-height:calc(100vh - 68px);display:flex;align-items:center;overflow:hidden}.hero:before{background:radial-gradient(circle at 20% 30%,rgba(0,212,255,.15),transparent 50%),radial-gradient(circle at 80% 70%,rgba(0,120,255,.12),transparent 50%)}.hero:after,.hero:before{content:"";position:absolute;inset:0;pointer-events:none}.hero:after{background-image:linear-gradient(rgba(0,212,255,.04) 1px,transparent 0),linear-gradient(90deg,rgba(0,212,255,.04) 1px,transparent 0);background-size:60px 60px;mask-image:radial-gradient(ellipse at center,#000 30%,transparent 80%);-webkit-mask-image:radial-gradient(ellipse at center,#000 30%,transparent 80%)}.hero-content{position:relative;z-index:1;max-width:820px}.hero-tag{display:inline-block;padding:6px 14px;border:1px solid var(--color-border-hover);border-radius:999px;font-size:13px;color:var(--color-primary);margin-bottom:24px;background:rgba(0,212,255,.06)}.hero h1{font-size:clamp(36px,5.5vw,64px);font-weight:700;line-height:1.15;letter-spacing:-.5px;margin-bottom:20px;background:linear-gradient(120deg,#fff,#00d4ff);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-sub{font-size:clamp(16px,1.8vw,20px);color:var(--color-text-soft);margin-bottom:40px;max-width:640px}.hero-actions{display:flex;gap:16px;flex-wrap:wrap}.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 28px;border-radius:var(--radius);font-size:15px;font-weight:500;transition:all .2s}.btn-primary{background:linear-gradient(135deg,#00d4ff,#0078ff);color:#0a1929;box-shadow:0 8px 24px rgba(0,212,255,.25)}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 32px rgba(0,212,255,.35)}.btn-ghost{background:transparent;color:var(--color-text);border:1px solid var(--color-border-hover)}.btn-ghost:hover{background:rgba(0,212,255,.08);border-color:var(--color-primary)}.section{padding:100px 0;position:relative}.section-head{text-align:center;margin-bottom:64px}.section-eyebrow{display:inline-block;font-size:13px;color:var(--color-primary);letter-spacing:2px;text-transform:uppercase;margin-bottom:12px}.section-title{font-size:clamp(28px,3.5vw,40px);font-weight:700;margin-bottom:16px}.section-desc{color:var(--color-text-soft);max-width:640px;margin:0 auto;font-size:16px}.about{background:var(--color-bg-soft)}.about-grid{display:grid;grid-template-columns:1fr 1fr;grid-gap:60px;gap:60px;align-items:center}.about-text p{color:var(--color-text-soft);margin-bottom:16px;font-size:16px}.about-text strong{color:var(--color-primary);font-weight:600}.about-stats{display:grid;grid-template-columns:repeat(2,1fr);grid-gap:20px;gap:20px}.stat-card{background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--radius);padding:28px 24px;transition:all .25s}.stat-card:hover{border-color:var(--color-border-hover);transform:translateY(-4px);box-shadow:var(--shadow-glow)}.stat-num{font-size:36px;font-weight:700;color:var(--color-primary);margin-bottom:6px}.stat-label{font-size:14px;color:var(--color-text-soft)}.services-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));grid-gap:24px;gap:24px}.service-card{position:relative;display:block;background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--radius);padding:36px 28px;transition:all .3s;overflow:hidden}.service-card:before{content:"";position:absolute;top:0;left:0;right:0;height:2px;background:linear-gradient(90deg,transparent,var(--color-primary),transparent);opacity:0;transition:opacity .3s}.service-card:hover{border-color:var(--color-border-hover);transform:translateY(-6px);box-shadow:var(--shadow-glow)}.service-card:hover:before{opacity:1}.service-icon{width:52px;height:52px;border-radius:12px;background:linear-gradient(135deg,rgba(0,212,255,.2),rgba(0,120,255,.1));display:flex;align-items:center;justify-content:center;margin-bottom:20px;color:var(--color-primary);font-size:26px}.service-title{font-size:20px;font-weight:600;margin-bottom:12px}.service-desc{color:var(--color-text-soft);font-size:14.5px;line-height:1.7}.contact{background:var(--color-bg-soft)}.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:24px;gap:24px}.contact-grid .contact-card:first-child{grid-column:1/-1;grid-row:2;justify-content:center;align-items:center;text-align:center}.contact-card{display:flex;gap:16px;align-items:flex-start;background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--radius);padding:24px;transition:all .2s}.contact-card:hover{border-color:var(--color-border-hover)}.contact-icon{flex-shrink:0;width:44px;height:44px;border-radius:10px;background:rgba(0,212,255,.12);display:flex;align-items:center;justify-content:center;color:var(--color-primary);font-size:20px}.contact-label{font-size:13px;color:var(--color-text-mute);margin-bottom:4px;letter-spacing:.5px}.contact-value{font-size:15px;color:var(--color-text);word-break:break-word;overflow-wrap:anywhere}.site-footer{background:#061321;border-top:1px solid var(--color-border);padding:40px 0;text-align:center}.footer-cols{display:flex;justify-content:center;gap:64px;flex-wrap:wrap;margin-bottom:26px}.footer-col{display:flex;flex-direction:column;gap:10px;text-align:left}.footer-col-title{font-size:13px;color:var(--color-text-mute);letter-spacing:1px;margin-bottom:4px}.footer-link{font-size:13.5px;color:var(--color-text-soft);transition:color .2s}.footer-link:hover{color:var(--color-primary)}.copyright{line-height:1.8}.beian,.copyright{font-size:13px;color:var(--color-text-mute)}.beian{margin-top:4px}.beian a{color:var(--color-text-soft);transition:color .2s}.beian a:hover{color:var(--color-primary)}.beian-sep{margin:0 8px;color:var(--color-text-mute)}.beian-badge{display:inline-block;vertical-align:middle;margin-right:4px}.page-hero{position:relative;overflow:hidden;padding:68px 0 52px;border-bottom:1px solid var(--color-border)}.page-hero:before{background:radial-gradient(circle at 15% 20%,rgba(0,212,255,.14),transparent 52%),radial-gradient(circle at 85% 75%,rgba(0,120,255,.1),transparent 50%)}.page-hero:after,.page-hero:before{content:"";position:absolute;inset:0;pointer-events:none}.page-hero:after{background-image:linear-gradient(rgba(0,212,255,.035) 1px,transparent 0),linear-gradient(90deg,rgba(0,212,255,.035) 1px,transparent 0);background-size:60px 60px;mask-image:radial-gradient(ellipse at center,#000 25%,transparent 78%);-webkit-mask-image:radial-gradient(ellipse at center,#000 25%,transparent 78%)}.page-hero-inner{position:relative;z-index:1;max-width:860px}.page-hero h1{font-size:clamp(28px,4.2vw,46px);font-weight:700;line-height:1.2;letter-spacing:-.3px;margin-bottom:18px;background:linear-gradient(120deg,#fff,#00d4ff);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.page-hero-desc{font-size:17px;color:var(--color-text-soft);max-width:760px}.breadcrumb{display:flex;align-items:center;gap:10px;flex-wrap:wrap;font-size:13px;color:var(--color-text-mute);margin-bottom:20px}.breadcrumb a{color:var(--color-text-soft);transition:color .2s}.breadcrumb a:hover{color:var(--color-primary)}.breadcrumb-sep{opacity:.5}.prose{max-width:860px}.prose h2{font-size:clamp(21px,2.6vw,29px);font-weight:700;margin:48px 0 16px;line-height:1.35}.prose h2:first-child{margin-top:0}.prose h3{font-size:18px;font-weight:600;margin:30px 0 10px;color:var(--color-primary-soft)}.prose p{color:var(--color-text-soft);margin-bottom:16px;font-size:16px}.prose ol,.prose ul{margin:0 0 18px;padding-left:22px;color:var(--color-text-soft)}.prose li{margin-bottom:8px}.prose strong{color:var(--color-text);font-weight:600}.prose a{color:var(--color-primary);border-bottom:1px solid rgba(0,212,255,.3)}.prose a:hover{border-bottom-color:var(--color-primary)}.feature-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));grid-gap:20px;gap:20px;margin:30px 0}.feature-item{background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--radius);padding:24px;transition:all .25s}.feature-item:hover{border-color:var(--color-border-hover);transform:translateY(-3px)}.feature-item h3{font-size:17px;font-weight:600;margin:0 0 10px;color:var(--color-text)}.feature-item p{color:var(--color-text-soft);font-size:14.5px;line-height:1.75;margin:0}.spec-list{border:1px solid var(--color-border);border-radius:var(--radius);overflow:hidden;margin:26px 0}.spec-row{display:grid;grid-template-columns:190px 1fr;border-bottom:1px solid var(--color-border)}.spec-row:last-child{border-bottom:none}.spec-key{background:rgba(0,212,255,.05);font-weight:600;color:var(--color-primary)}.spec-key,.spec-val{padding:13px 20px;font-size:14.5px}.spec-val{color:var(--color-text-soft)}.page-cta{margin-top:60px;padding:38px 32px;border:1px solid var(--color-border-hover);border-radius:var(--radius);background:linear-gradient(135deg,rgba(0,212,255,.08),rgba(0,120,255,.04));text-align:center}.page-cta h2{font-size:24px;font-weight:700;margin:0 0 12px}.page-cta p{color:var(--color-text-soft);margin:0 0 24px}.page-cta-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}.section-link{display:inline-flex;align-items:center;gap:6px;margin-top:18px;color:var(--color-primary);font-size:15px;transition:gap .2s}.section-link:hover{gap:10px}@media (max-width:860px){.site-header .container{height:auto;padding-top:12px;padding-bottom:12px;gap:16px}.nav{gap:20px;overflow-x:auto;-webkit-overflow-scrolling:touch}.nav-link{font-size:14px}.about-grid{grid-template-columns:1fr;gap:40px}.section{padding:70px 0}.hero{min-height:80vh}.contact-grid{grid-template-columns:1fr}.contact-grid .contact-card:first-child{grid-column:auto;grid-row:auto}.spec-row{grid-template-columns:1fr}.spec-key{padding-bottom:4px}.footer-cols{gap:36px}}@media (max-width:480px){.hero-actions{flex-direction:column;align-items:stretch}.btn{justify-content:center}.stat-num{font-size:28px}.page-cta{padding:28px 20px}}

/* ==========================================================
   移动端页头：logo 与导航分两行
   —— 原样式把导航挤在一行，375px 宽时「联系我们」会被裁掉，
      横向滚动条在触屏上又几乎察觉不到。改成上下两行更稳妥。
   ========================================================== */
@media (max-width:860px){
  .site-header .container{flex-wrap:wrap;height:auto;padding-top:12px;padding-bottom:12px;gap:10px}
  .brand{width:100%}
  .brand-logo{height:36px}
  .nav{width:100%;gap:0;justify-content:space-between;overflow-x:visible}
  .nav-link{font-size:14px}
}

/* ==========================================================
   业务线四个框：列数写死 + 卡片内部对齐
   —— 问题：.services-grid / .feature-list 原来用的是
      repeat(auto-fit, minmax(260px,1fr))。auto-fit 会按容器宽度
      自动算列数，在 900~1024px 视口下会排成「3 + 1」——
      第 4 个框孤零零掉到下一行，看着不协调。
      1024px 恰好是笔记本的常见宽度，所以很容易撞上。
   —— 改法：显式三档 4 列 → 2 列 → 1 列，永远不会出现 3+1。
      全站 8 处网格实测都是 4 条，写死列数不会留空。
   ========================================================== */
.services-grid,
.feature-list{
    grid-template-columns:repeat(4,1fr);
}
@media (max-width:1179px){
    .services-grid,
    .feature-list{
        grid-template-columns:repeat(2,1fr);
    }
}
@media (max-width:639px){
    .services-grid,
    .feature-list{
        grid-template-columns:1fr;
    }
}

/* ------------------------------------------------------------
   四列并排时收紧卡片左右留白：
   卡片宽 270px，左右内边距 28px 的话内容区只剩 214px，
   而最长的标题「工业自动化与元器件供应」11 个字 × 20px = 220px，
   会被挤成两行 —— 标题一换行，下面的描述和「了解详情 →」
   就跟另外三个框错开一行，正是「不协调」的另一半原因。
   收到 20px 后内容区 230px，标题能稳稳排在一行。
   ------------------------------------------------------------ */
@media (min-width:1180px){
    .service-card{padding:36px 20px}
}

/* ------------------------------------------------------------
   卡片改成纵向 flex，底部「了解详情 →」四张卡对齐齐平。
   就算以后有人把标题改长到换行，CTA 也不会跟着错位。
   （只有 .service-card 有 CTA，.feature-item 没有，不用动）
   ------------------------------------------------------------ */
.service-card{
    display:flex;
    flex-direction:column;
}
.service-card .section-link{
    margin-top:auto;
    padding-top:16px;
}