/* ============================================================
   富美达精密制造 · 全站主样式（2026-09 重排版）
   架构：移动优先（mobile-first），断点 560 / 768 / 841 / 1024 / 1200
   841px 为手机/桌面分界（与 main.js 导航复位阈值一致）
   ============================================================ */

/* ============ 设计令牌 ============ */
:root{
  --navy:#0E1A2B;
  --navy-2:#1B2B45;
  --blue:#2563EB;
  --blue-deep:#1D4ED8;
  --sky:#3B82F6;
  --cyan:#0EA5E9;
  --orange:#F97316;
  --orange-deep:#EA580C;
  --bg:#F7F9FC;
  --bg-2:#EDF1F7;
  --text:#0E1A2B;
  --text-2:#4B5563;
  --text-3:#8A94A6;
  --border:#E3E8F0;
  --radius:14px;
  --radius-lg:20px;
  --shadow:0 6px 24px rgba(14,26,43,.06);
  --shadow-lg:0 18px 48px rgba(14,26,43,.12);
  --maxw:1240px;
  --header-h:56px;
  /* 间距刻度 */
  --sp-1:6px; --sp-2:10px; --sp-3:14px; --sp-4:18px;
  --sp-5:24px; --sp-6:32px; --sp-7:44px; --sp-8:64px;
}

/* ============ 重置与基础 ============ */
*{margin:0;padding:0;box-sizing:border-box;}
html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
  overflow-x:hidden;width:100%;
}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--text);background:#fff;line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{text-decoration:none;color:inherit;}
ul{list-style:none;}
img{max-width:100%;height:auto;display:block;}
button{font-family:inherit;}
::selection{background:rgba(37,99,235,.18);}
:focus-visible{outline:2.5px solid var(--blue);outline-offset:2px;border-radius:4px;}

.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 16px;}

/* 锚点定位避开吸顶栏 */
section[id],div[id]{scroll-margin-top:calc(var(--header-h) + 12px);}

/* ============ 顶栏（移动优先：汉堡抽屉） ============ */
.site-header{
  position:sticky;top:0;z-index:100;background:#fff;
  border-bottom:1px solid var(--border);
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:3px;
  background:linear-gradient(90deg,var(--blue),var(--cyan));
}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  height:var(--header-h);gap:12px;
}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;min-width:0;}
.brand-mark{
  width:34px;height:34px;border-radius:9px;flex-shrink:0;
  background:linear-gradient(135deg,var(--blue) 0%,var(--cyan) 100%);
  position:relative;box-shadow:0 4px 12px rgba(37,99,235,.3);
}
.brand-mark::after{
  content:"";position:absolute;inset:9px;border-radius:4px;
  border:2px solid #fff;transform:rotate(45deg);
}
.brand-text{min-width:0;}
.brand-text strong{display:block;color:var(--navy);font-size:16px;letter-spacing:.5px;line-height:1.2;white-space:nowrap;}
.brand-text small{display:block;color:var(--text-3);font-size:9px;letter-spacing:1.5px;}

/* 桌面导航在 ≥841 出现；手机端为抽屉 */
.main-nav{
  position:fixed;top:var(--header-h);left:0;right:0;bottom:0;
  background:#fff;z-index:99;
  display:flex;flex-direction:column;
  padding:8px 22px 28px;overflow-y:auto;
  opacity:0;visibility:hidden;transform:translateY(-8px);
  transition:opacity .22s ease,visibility .22s ease,transform .22s ease;
  box-shadow:0 12px 32px rgba(14,26,43,.10);
}
.main-nav.open{opacity:1;visibility:visible;transform:translateY(0);}
.main-nav a{
  display:flex;align-items:center;min-height:52px;
  font-size:16px;font-weight:500;color:var(--text-2);
  border-bottom:1px solid var(--border);
}
.main-nav a.active{color:var(--blue);font-weight:700;}
/* 抽屉最后一项（联系我们）做成主按钮 */
.main-nav a:last-child{
  border-bottom:none;margin-top:14px;justify-content:center;
  background:linear-gradient(135deg,var(--blue),var(--blue-deep));
  color:#fff;font-weight:700;border-radius:12px;min-height:50px;
  box-shadow:0 8px 20px rgba(37,99,235,.28);
}
.header-cta{display:flex;align-items:center;gap:8px;flex-shrink:0;}
.sales{
  display:inline-flex;align-items:center;gap:6px;
  color:var(--blue);font-weight:700;font-size:13.5px;letter-spacing:.2px;
  white-space:nowrap;padding:7px 12px;min-height:36px;
  border:1.5px solid var(--blue);border-radius:99px;
  transition:all .18s;
}
/* 手机端胶囊只显示号码，桌面端恢复全称 */
.sales-label{display:none;}
.sales:hover{background:var(--blue);color:#fff;}
.nav-toggle{
  display:inline-flex;flex-direction:column;gap:5px;
  background:none;border:none;cursor:pointer;
  padding:12px;margin-right:-8px;
}
.nav-toggle span{display:block;width:25px;height:2.5px;background:var(--navy);border-radius:2px;transition:all .25s;}
.nav-toggle.open span:nth-child(1){transform:translateY(7.5px) rotate(45deg);}
.nav-toggle.open span:nth-child(2){opacity:0;}
.nav-toggle.open span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg);}
body.nav-open{overflow:hidden;}

/* ============ Hero Banner 轮播（全幅底图式） ============ */
.hero{position:relative;overflow:hidden;background:var(--bg);}
.banner-slider{position:relative;}
.banner{
  position:absolute;inset:0;
  background-size:cover;background-position:center;background-repeat:no-repeat;
  opacity:0;visibility:hidden;transition:opacity .7s ease,visibility .7s ease;
  display:flex;align-items:center;
}
.banner.active{opacity:1;visibility:visible;position:relative;}
.banner-1{background-image:url("../images/banner-1.jpg");}
.banner-2{background-image:url("../images/banner-2.jpg");}
/* 竖屏遮罩：上透下深，托住文字 */
.banner::after{
  content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background:linear-gradient(180deg,
    rgba(14,26,43,.60) 0%,
    rgba(14,26,43,.68) 45%,
    rgba(14,26,43,.84) 100%);
}
.banner-inner{
  position:relative;z-index:2;width:100%;max-width:var(--maxw);margin:0 auto;
  padding:56px 16px 76px;min-height:480px;
  display:flex;align-items:center;
}
.banner-content{display:flex;flex-direction:column;align-items:flex-start;max-width:100%;}
.banner-tag{
  display:inline-flex;align-items:center;gap:6px;
  color:#7DB6FF;font-size:11.5px;font-weight:600;letter-spacing:.5px;
  margin-bottom:14px;padding:5px 11px;line-height:1.5;
  border:1px solid rgba(125,182,255,.45);border-radius:99px;
  background:rgba(125,182,255,.08);
}
.banner-tag::before{content:"";width:14px;height:2px;background:#7DB6FF;border-radius:2px;flex-shrink:0;}
.banner h1{
  color:#fff;font-size:clamp(24px,7vw,52px);line-height:1.28;font-weight:800;
  letter-spacing:-.2px;margin-bottom:12px;
  text-shadow:0 2px 16px rgba(0,0,0,.25);
}
.banner h1 em{font-style:normal;color:#7DB6FF;}
.banner h1 .accent{color:var(--orange);}
.banner-subnote{
  color:rgba(255,255,255,.88);font-size:13.5px;line-height:1.7;margin-bottom:10px;
  text-shadow:0 1px 8px rgba(0,0,0,.25);
}
.banner-lead{
  color:rgba(255,255,255,.92);font-size:15px;line-height:1.8;
  text-shadow:0 1px 8px rgba(0,0,0,.25);
}
.banner-lead b{color:#fff;font-weight:700;}
/* 手机隐藏参数堆叠段，首屏只留一句卖点 */
.banner-lead{display:none;}

/* 轮播点 */
.banner-dots{
  position:absolute;left:0;right:0;bottom:8px;
  display:flex;justify-content:center;gap:8px;z-index:10;
  padding:14px 0;
}
.banner-dots button{
  /* 视觉条 6px + 上下透明触控区，总触点 ≥34px */
  width:26px;height:34px;border:none;cursor:pointer;
  background:linear-gradient(rgba(255,255,255,.35),rgba(255,255,255,.35)) center/26px 6px no-repeat;
  transition:all .3s;
}
.banner-dots button.active{background:linear-gradient(#fff,#fff) center/44px 6px no-repeat;}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:46px;padding:12px 24px;border-radius:11px;
  font-size:15px;font-weight:600;cursor:pointer;border:none;transition:all .2s;
}
.btn-primary{
  background:linear-gradient(135deg,var(--blue) 0%,var(--blue-deep) 100%);
  color:#fff;box-shadow:0 8px 20px rgba(37,99,235,.32);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(37,99,235,.42);}
.btn-ghost{background:transparent;color:var(--blue);border:1.5px solid var(--blue);}
.btn-ghost:hover{background:var(--blue);color:#fff;}

/* ============ 通用 section ============ */
.section{padding:clamp(20px,4vw,44px) 0;}
.section-alt{background:var(--bg);}
.section-head{max-width:680px;margin:0 0 clamp(12px,2.5vw,18px);}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center;}
.section-eyebrow{
  display:inline-block;color:var(--blue);font-size:12.5px;font-weight:700;
  letter-spacing:2px;margin-bottom:5px;
}
.section-head h2{
  font-size:clamp(22px,3.2vw,32px);font-weight:800;letter-spacing:-.4px;color:var(--navy);
  margin-bottom:5px;line-height:1.28;
}
.section-head p{color:var(--text-2);font-size:14px;margin-top:4px;line-height:1.55;}
.section-foot{text-align:center;margin-top:clamp(12px,2.5vw,18px);}

/* ============ 应用行业（图片卡片） ============ */
/* 移动优先：手机两列紧凑，逐级升到桌面五列 */
.ind-grid-img{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;}
.ind-card-img{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  overflow:hidden;transition:all .25s;display:block;
}
.ind-card-img:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--blue);}
.ic-img{aspect-ratio:16/10;overflow:hidden;background:var(--bg-2);}
.ic-img img{width:100%;height:100%;object-fit:cover;transition:transform .5s;}
.ind-card-img:hover .ic-img img{transform:scale(1.06);}
.ic-body{padding:12px 13px 13px;}
.ic-body b{font-size:15px;color:var(--navy);display:block;margin-bottom:4px;font-weight:700;}
.ic-body p{font-size:12.5px;color:var(--text-2);line-height:1.55;}
.ic-scene-line{
  display:block;margin-top:7px;padding-top:7px;
  border-top:1px dashed var(--border);
  font-size:12px;color:var(--blue);font-weight:600;line-height:1.45;
}

/* ============ 页脚（浅蓝渐变） ============ */
.site-footer{
  background:linear-gradient(180deg,#EAF4FF 0%,#D9EAFE 100%);
  color:var(--text-2);
  border-top:1px solid #CFE3FB;
  padding:clamp(32px,5vw,52px) 0 0;
}
/* 手机也并排：品牌占满一行，产品/支持并排，联系方式占满 */
.footer-inner{display:grid;grid-template-columns:repeat(2,1fr);gap:20px 16px;padding-bottom:26px;}
.footer-brand{grid-column:1/-1;}
.footer-col:last-child{grid-column:1/-1;}
.footer-brand strong{display:block;color:var(--navy);font-size:17px;margin-bottom:8px;}
.footer-brand p{font-size:13px;line-height:1.65;color:var(--text-2);}
.footer-address-line{font-size:12.5px;color:var(--text-3);margin-top:10px;line-height:1.6;}
.footer-col{display:flex;flex-direction:column;gap:2px;}
.footer-col b{color:var(--blue);font-size:14px;margin-bottom:6px;font-weight:700;}
.footer-col span.footer-addr{font-size:13px;color:var(--text-2);line-height:1.6;padding:5px 0;}
.footer-col a{
  font-size:13.5px;color:var(--text-2);transition:color .2s;
  padding:7px 0;display:inline-block;min-height:36px;
}
.footer-col a:hover{color:var(--blue);}
.footer-bottom{
  border-top:1px solid #CFE3FB;padding:14px 16px;
  font-size:12px;color:var(--text-3);text-align:center;line-height:1.6;
}
.footer-bottom a{display:inline-block;padding:6px 2px;}

/* ============ FAQ ============ */
.faq-list{display:flex;flex-direction:column;gap:10px;}
.faq-item{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  transition:all .2s;
}
.faq-item[open]{border-color:var(--blue);box-shadow:var(--shadow);}
.faq-item summary{
  list-style:none;cursor:pointer;
  padding:16px 44px 16px 16px;font-size:15px;font-weight:600;color:var(--navy);
  position:relative;min-height:52px;display:flex;align-items:center;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{
  content:"+";position:absolute;right:16px;top:50%;transform:translateY(-50%);
  font-size:22px;font-weight:300;color:var(--blue);transition:transform .2s;
}
.faq-item[open] summary::after{content:"−";}
.faq-item summary:hover{color:var(--blue);}
.faq-answer{padding:0 16px 16px;color:var(--text-2);font-size:14px;line-height:1.75;}

/* ============ 询盘表单（深蓝带） ============ */
.contact-band{
  background:linear-gradient(135deg,var(--navy) 0%,var(--navy-2) 100%);
  color:#fff;border-radius:var(--radius-lg);padding:clamp(24px,4vw,36px);
}
.contact-band h2{font-size:clamp(20px,2.4vw,26px);letter-spacing:-.3px;margin-bottom:6px;}
.contact-band .lead{color:rgba(255,255,255,.75);font-size:14px;margin-bottom:18px;line-height:1.6;}
.form-grid{display:grid;grid-template-columns:1fr;gap:12px;}
.form-grid .full{grid-column:1/-1;}
.f-field{display:flex;flex-direction:column;gap:5px;}
.f-field label{font-size:12.5px;color:rgba(255,255,255,.75);font-weight:500;}
.f-field input,.f-field select,.f-field textarea{
  background:rgba(255,255,255,.08);color:#fff;
  border:1px solid rgba(255,255,255,.18);border-radius:8px;
  padding:11px 12px;min-height:44px;font-size:15px;font-family:inherit;
  transition:border-color .2s;
}
.f-field input::placeholder,.f-field textarea::placeholder{color:rgba(255,255,255,.45);}
.f-field input:focus,.f-field select:focus,.f-field textarea:focus{
  outline:none;border-color:var(--cyan);background:rgba(255,255,255,.12);
}
.f-field select option{color:var(--text);background:#fff;}
.f-field textarea{min-height:88px;resize:vertical;}
.f-submit{grid-column:1/-1;margin-top:6px;}
.f-submit .btn-primary{
  background:linear-gradient(135deg,var(--orange) 0%,var(--orange-deep) 100%);
  box-shadow:0 8px 20px rgba(249,115,22,.32);width:100%;
}
.f-note{grid-column:1/-1;font-size:11.5px;color:rgba(255,255,255,.55);line-height:1.5;}

/* ============ 手机底部快捷联系栏（≤840 显示） ============ */
.mobile-cta{display:flex;}
.mobile-cta{
  position:fixed;left:0;right:0;bottom:0;z-index:90;
  gap:10px;padding:8px 12px calc(8px + env(safe-area-inset-bottom));
  background:rgba(255,255,255,.96);
  border-top:1px solid var(--border);
  box-shadow:0 -6px 20px rgba(14,26,43,.08);
  backdrop-filter:blur(8px);
}
.mcta-btn{
  flex:1;display:inline-flex;align-items:center;justify-content:center;
  min-height:44px;border-radius:11px;
  font-size:15px;font-weight:700;letter-spacing:1px;
}
.mcta-call{background:linear-gradient(135deg,var(--blue),var(--blue-deep));color:#fff;box-shadow:0 6px 16px rgba(37,99,235,.30);}
.mcta-mail{background:#fff;color:var(--blue);border:1.5px solid var(--blue);}
/* 给固定联系栏腾出空间 */
body{padding-bottom:calc(62px + env(safe-area-inset-bottom));}
body.nav-open{padding-bottom:0;}

/* ============================================================
   平板及以上
   ============================================================ */

/* ≥560：小平板/大屏手机 */
@media(min-width:560px){
  .footer-inner{grid-template-columns:1fr 1fr;}
  .banner-inner{padding:64px 24px 84px;}
  .banner-tag{font-size:13px;letter-spacing:1px;padding:6px 14px;}
  .banner-subnote{font-size:15.5px;max-width:640px;}
  .form-grid{grid-template-columns:1fr 1fr;gap:12px 14px;}
}

/* ≥768：平板 */
@media(min-width:768px){
  .container{padding:0 24px;}
  .brand-text strong{font-size:17px;}
  .brand-text small{font-size:10px;letter-spacing:2px;}
  .banner-inner{min-height:480px;}
  .banner-lead{display:block;}
  .ind-grid-img{grid-template-columns:repeat(3,1fr);gap:16px;}
  .footer-inner{grid-template-columns:1fr 1fr;gap:28px;}
  .footer-bottom{text-align:left;}
}

/* ≥841：桌面导航回归（与 main.js 的 840 复位阈值一致） */
@media(min-width:841px){
  :root{--header-h:64px;}
  .main-nav{
    position:static;flex-direction:row;gap:24px;
    padding:0;overflow:visible;background:transparent;
    opacity:1;visibility:visible;transform:none;box-shadow:none;
  }
  .main-nav a{
    display:inline-flex;min-height:0;padding:8px 0;
    font-size:15px;font-weight:500;color:var(--text-2);
    border-bottom:none;position:relative;transition:color .2s;
  }
  .main-nav a:hover{color:var(--blue);}
  .main-nav a.active{color:var(--blue);font-weight:600;}
  .main-nav a.active::after,.main-nav a:hover::after{
    content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
    background:linear-gradient(90deg,var(--blue),var(--cyan));border-radius:2px;
  }
  /* 桌面端「联系我们」恢复普通链接样式 */
  .main-nav a:last-child{
    background:none;color:var(--text-2);font-weight:500;
    border-radius:0;min-height:0;box-shadow:none;margin-top:0;
  }
  .main-nav a:last-child:hover{color:var(--blue);}
  .nav-toggle{display:none;}
  .header-cta{gap:14px;}
  .sales{font-size:14.5px;padding:7px 15px;}
  .sales-label{display:inline;}
  /* 桌面横版遮罩：左深右透，露出右侧陶瓷件 */
  .banner{background-position:center right;}
  .banner::after{
    background:linear-gradient(90deg,
      rgba(14,26,43,.78) 0%,
      rgba(14,26,43,.68) 28%,
      rgba(14,26,43,.42) 55%,
      rgba(14,26,43,.12) 78%,
      rgba(14,26,43,0) 100%);
  }
  .banner-inner{padding:88px 24px;min-height:540px;}
  .banner-content{max-width:760px;}
  .banner-subnote{max-width:680px;}
  .banner-dots{left:50%;right:auto;bottom:16px;transform:translateX(-50%);padding:0;}
  /* 手机底部联系栏下线 */
  .mobile-cta{display:none;}
  body{padding-bottom:0;}
  /* 行业卡恢复 4:3 竖版观感 */
  .ic-img{aspect-ratio:4/3;}
  .ic-body{padding:14px 16px;}
}

/* ≥1024：桌面 */
@media(min-width:1024px){
  .ind-grid-img{grid-template-columns:repeat(5,1fr);}
  .footer-inner{grid-template-columns:2fr 1fr 1fr 1fr;}
  .footer-brand{grid-column:auto;}
  .footer-col:last-child{grid-column:auto;}
  .footer-brand p{max-width:280px;}
}

/* ≥1200：大屏（容器 1240 顶格） */
@media(min-width:1200px){
  .main-nav{gap:28px;}
}

/* 窄屏兜底：品牌名与号码胶囊不挤压 */
@media(max-width:379px){
  .brand-text small{display:none;}
  .brand-text strong{font-size:15px;}
  .sales{font-size:12.5px;padding:6px 9px;letter-spacing:0;}
  .header-inner{gap:8px;}
  .banner-tag{white-space:normal;line-height:1.5;}
}
@media(max-width:349px){
  .sales{display:none;}
}

/* 动效偏好：减少动画 */
@media(prefers-reduced-motion:reduce){
  *{transition-duration:.01ms !important;animation-duration:.01ms !important;}
  html{scroll-behavior:auto;}
}