/* =============================================================
   飞宇法兰 & 精业阀门 一体化工业官网  —  全局样式表
   主色调：深灰 #2b2f36 / 金属银 #c5c9d0 / 藏蓝 #16335c
   说明：所有图片均为「点击上传图片」占位，替换时把对应 
        .img-placeholder / .logo-placeholder 替换为 <img> 即可。
   ============================================================= */

:root{
  --navy:#16335c;          /* 藏蓝 主色 */
  --navy-light:#295085;    /* 藏蓝 hover */
  --navy-grad:linear-gradient(135deg,#16335c 0%,#295085 100%);
  --dark-gray:#2b2f36;     /* 深灰 */
  --gray:#4a4f57;
  --silver:#c5c9d0;        /* 金属银 */
  --silver-light:#e8eaed;
  --bg:#f5f6f8;
  --bg-soft:#eef0f3;
  --white:#ffffff;
  --text:#2b2f36;
  --text-soft:#5a6069;
  --radius:6px;
  --shadow:0 4px 18px rgba(22,51,92,.10);
  --shadow-hover:0 8px 28px rgba(22,51,92,.18);
  --maxw:1200px;
  --header-h:72px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Segoe UI","Microsoft YaHei",-apple-system,"Helvetica Neue",Arial,sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.7;
  font-size:15px;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
ul{list-style:none}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 20px}
.en{display:block;font-size:12px;letter-spacing:.5px;color:var(--text-soft);font-weight:400;margin-top:2px;text-transform:uppercase}

/* ============ 按钮 Button ============ */
.btn{
  display:inline-block;cursor:pointer;border:none;
  padding:11px 22px;border-radius:var(--radius);
  font-size:14px;font-weight:600;letter-spacing:.3px;
  transition:all .25s ease;text-align:center;white-space:nowrap;
}
/* 统一转化按钮：藏蓝底白字，hover浅蓝渐变 */
.btn-primary{background:var(--navy);color:#fff}
.btn-primary:hover{background:var(--navy-light);background:var(--navy-grad);box-shadow:var(--shadow-hover);transform:translateY(-1px)}
.btn-outline{border:1.5px solid var(--navy);color:var(--navy);background:transparent}
.btn-outline:hover{background:var(--navy);color:#fff}
.btn-silver{background:var(--silver);color:var(--dark-gray)}
.btn-silver:hover{background:#fff;color:var(--navy)}
.btn-block{display:block;width:100%}

/* ============ 顶部导航 Header ============ */
.site-header{
  position:sticky;top:0;z-index:1000;
  background:var(--dark-gray);
  border-bottom:2px solid var(--navy);
  box-shadow:0 2px 10px rgba(0,0,0,.15);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:var(--header-h);gap:16px}
.brand-logos{display:flex;align-items:center;gap:14px}
/* 商标 — 两个品牌 logo 统一高度，视觉协调 */
.brand-logos img{
  height:38px;width:auto;object-fit:contain;
  display:block;border-radius:4px;
}
/* 兼容旧占位样式 */
.logo-placeholder{
  height:42px;min-width:120px;padding:0 12px;
  display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,#3a3f47,#2b2f36);
  border:1px dashed var(--silver);border-radius:4px;
  color:var(--silver);font-size:12px;font-weight:600;letter-spacing:.5px;
  cursor:pointer;transition:.2s;
}
.logo-placeholder:hover{border-color:#fff;color:#fff}
.logo-placeholder img{height:38px;width:auto}

.main-nav ul{display:flex;gap:6px}
.main-nav a{
  display:block;padding:10px 16px;color:#e8eaed;font-size:15px;font-weight:500;
  border-radius:4px;transition:.2s;position:relative;
}
.main-nav a:hover,.main-nav a.active{color:#fff;background:rgba(41,80,133,.55)}
.main-nav a.active::after{content:"";position:absolute;left:16px;right:16px;bottom:4px;height:2px;background:var(--silver)}

.nav-cta{display:flex;gap:10px;align-items:center}
.lang-switch{display:flex;align-items:center;gap:0;margin-left:8px;border:1px solid var(--silver);border-radius:4px;overflow:hidden}
.lang-switch button{background:transparent;border:none;color:var(--silver);font-size:12px;font-weight:600;padding:5px 10px;cursor:pointer;transition:.2s;line-height:1}
.lang-switch button.active{background:var(--navy);color:#fff}
.lang-switch button:not(.active):hover{background:rgba(255,255,255,.08)}
.nav-toggle{display:none;background:none;border:none;color:#fff;font-size:26px;cursor:pointer;line-height:1}

/* ============ 首屏 Banner 轮播 ============ */
.hero{position:relative;height:88vh;min-height:520px;overflow:hidden;background:var(--dark-gray)}
.slides{position:absolute;inset:0}
.slide{
  position:absolute;inset:0;opacity:0;transition:opacity 1s ease;
  display:flex;align-items:center;
  background-size:cover;background-position:center;
  background-repeat:no-repeat;
}
.slide.active{opacity:1}
/* 三张 Banner 大图 — 自适应铺满（cover），随窗口缩放
   顺序：1=法兰  2=工业管件  3=阀门 */
.slide-1{background-image:url('../images/banner2-flanges.jpg')}
.slide-2{background-image:url('../images/banner3-pipefittings.png')}
.slide-3{background-image:url('../images/banner1-valves.jpg')}
.slide .upload-tag{
  position:absolute;top:18px;left:18px;background:rgba(0,0,0,.4);
  color:var(--silver);font-size:12px;padding:4px 10px;border-radius:4px;
}
.hero-content{position:relative;z-index:2;max-width:760px;color:var(--navy);padding:0 20px;text-align:center}
.hero-content h1{font-size:clamp(28px,4.4vw,52px);line-height:1.2;font-weight:700;margin-bottom:12px;color:var(--navy);text-shadow:0 1px 3px rgba(255,255,255,.6)}
.hero-content h1 .accent{color:var(--dark-gray)}
.hero-content p.sub{font-size:clamp(18px,2.4vw,28px);color:var(--dark-gray);margin-bottom:8px;font-weight:600;text-shadow:0 1px 2px rgba(255,255,255,.5)}
.hero-content p.sub-tagline{font-size:clamp(14px,1.6vw,18px);color:var(--text-soft);margin-bottom:22px}
.hero-content .hero-actions{display:flex;gap:14px;flex-wrap:wrap;justify-content:center}
.hero-content .hero-actions .btn-outline{border-color:var(--navy);color:var(--navy)}
.hero-content .hero-actions .btn-outline:hover{background:var(--navy);border-color:var(--navy);color:#fff}
.slide-dots{position:absolute;bottom:24px;left:50%;transform:translateX(-50%);display:flex;gap:10px;z-index:3}
.slide-dots button{width:12px;height:12px;border-radius:50%;border:none;background:rgba(255,255,255,.4);cursor:pointer}
.slide-dots button.active{background:var(--silver)}

/* ============ 区块通用 ============ */
.section{padding:70px 0}
.section-title{text-align:center;margin-bottom:46px}
.section-title h2{font-size:clamp(24px,3vw,34px);color:var(--navy);font-weight:700;position:relative;display:inline-block;padding-bottom:12px}
.section-title h2::after{content:"";position:absolute;left:50%;bottom:0;transform:translateX(-50%);width:60px;height:3px;background:var(--silver)}
.section-title p{color:var(--text-soft);margin-top:10px;font-size:15px}

/* ============ 首页业务分区（左右分栏） ============ */
.biz-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px}
.biz-card{
  background:var(--white);border-radius:var(--radius);overflow:hidden;
  border:1px solid var(--silver-light);box-shadow:var(--shadow);
  display:flex;flex-direction:column;
}
.biz-head{padding:24px 26px;background:var(--navy-grad);color:#fff}
.biz-head h3{font-size:21px;font-weight:700}
.biz-body{padding:24px 26px;flex:1;display:flex;flex-direction:column}
.thumb-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:22px}
.thumb-grid .img-placeholder{aspect-ratio:1/1}
.biz-adv{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px}
.biz-adv span{background:var(--bg-soft);color:var(--gray);font-size:13px;padding:6px 12px;border-radius:30px;border:1px solid var(--silver-light)}
.biz-foot{margin-top:auto;padding-top:8px}

/* ============ 图片 / 占位 ============ */
.img-placeholder{
  display:flex;align-items:center;justify-content:center;text-align:center;
  background:repeating-linear-gradient(45deg,#eef0f3 0 14px,#e3e6ea 14px 28px);
  border:1.5px dashed var(--silver);border-radius:4px;
  color:var(--gray);font-size:12px;font-weight:600;padding:10px;cursor:pointer;
  min-height:90px;transition:.2s;position:relative;
}
.img-placeholder:hover{border-color:var(--navy);color:var(--navy);background:#fff}
.banner-ph{height:300px}
/* 真实图片填充（替换占位）— 统一白底主图，自适应裁切铺满 */
.img-fill{display:block;width:100%;background:#fff;object-fit:cover}
.thumb-grid .img-fill{aspect-ratio:1/1;border-radius:4px}
/* 阀门图片卡片 — 完整展示产品 */
.valve-tile{
  display:flex;flex-direction:column;align-items:center;justify-content:flex-start;
  background:#fff;border:1px solid var(--silver-light);border-radius:6px;
  overflow:hidden;padding:0;
}
.valve-tile .img-fill{
  width:100%;height:140px;object-fit:contain;background:#fff;padding:8px;
}
.valve-tile span{
  display:block;width:100%;text-align:center;padding:8px 4px;
  font-size:12px;font-weight:600;color:var(--navy);background:var(--bg-soft);
  border-top:1px solid var(--silver-light);
}
.valve-tile:hover{border-color:var(--navy);box-shadow:0 2px 8px rgba(22,51,92,.12)}
.ind-card .img-fill{height:170px}
.team-card .img-fill{height:240px}
.prod-card .img-fill{height:200px;object-fit:contain;background:#fff;padding:12px}

/* ============ 四大核心优势 ============ */
.adv-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.adv-card{
  background:var(--white);border-radius:var(--radius);padding:30px 24px;
  box-shadow:var(--shadow);border-top:3px solid var(--navy);
  text-align:center;transition:.25s;display:flex;flex-direction:column;
}
.adv-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.adv-icon{
  width:58px;height:58px;margin:0 auto 16px;border-radius:50%;
  background:var(--navy-grad);color:#fff;display:flex;align-items:center;justify-content:center;
  font-size:24px;font-weight:700;
}
.adv-card h4{font-size:18px;color:var(--navy);margin-bottom:10px}
.adv-card p{color:var(--text-soft);font-size:14px;flex:1;margin-bottom:18px}

/* ============ 产品展示（3张大图，点击跳转产品页） ============ */
.showcase-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.showcase-card{
  position:relative;overflow:hidden;border-radius:var(--radius);
  box-shadow:var(--shadow);border:1px solid var(--silver-light);
  display:block;text-decoration:none;
}
.showcase-card img{
  width:100%;height:380px;object-fit:cover;display:block;
  transition:transform .5s ease;
}
.showcase-card:hover img{transform:scale(1.04)}
.showcase-overlay{
  position:absolute;left:0;right:0;bottom:0;padding:24px 20px;
  background:linear-gradient(transparent,rgba(22,51,92,.88));
  color:#fff;
}
.showcase-overlay h3{font-size:20px;font-weight:700;margin-bottom:6px}
.showcase-overlay p{font-size:14px;color:var(--silver-light);margin-bottom:12px}
.showcase-overlay .btn{font-size:13px;padding:8px 18px}

/* ============ 行业应用（保留备用） ============ */
.ind-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.ind-card{
  background:var(--white);border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow);transition:.25s;border:1px solid var(--silver-light);
}
.ind-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.ind-card .img-placeholder{border:none;border-radius:0;min-height:130px}
.ind-card .ind-text{padding:14px 16px;font-weight:600;color:var(--dark-gray);text-align:center;font-size:15px}

/* ============ 资质证书区 ============ */
.cert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.cert-card{background:var(--white);border-radius:var(--radius);padding:14px;box-shadow:var(--shadow);border:1px solid var(--silver-light)}
.cert-card .img-placeholder{min-height:200px}
.cert-card .img-fill{height:260px;border:1px solid var(--silver-light);border-radius:4px;background:#fff}
.cert-card p{text-align:center;font-size:13px;color:var(--text-soft);margin-top:10px}

/* ============ 团队 / 通用图片网格 ============ */
.team-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.team-card{background:var(--white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);text-align:center}
.team-card .img-placeholder{border:none;border-radius:0;min-height:220px}
.team-card h4{margin:14px 0 4px;color:var(--navy);font-size:17px}
.team-card span{color:var(--text-soft);font-size:13px;display:block;padding-bottom:16px}

/* ============ 企业文化 ============ */
.culture-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.culture-card{background:var(--navy);color:#fff;border-radius:var(--radius);padding:28px 22px;position:relative;overflow:hidden}
.culture-card::before{content:"";position:absolute;right:-20px;top:-20px;width:80px;height:80px;border-radius:50%;background:rgba(197,201,208,.12)}
.culture-card h4{font-size:17px;margin-bottom:10px;color:var(--silver)}
.culture-card p{font-size:14px;color:var(--silver-light);line-height:1.7}

/* ============ 产品服务页 ============ */
.prod-zone{background:var(--white);border-radius:var(--radius);padding:36px 30px;box-shadow:var(--shadow);margin-bottom:34px;border:1px solid var(--silver-light)}
.zone-head{display:flex;align-items:baseline;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-bottom:22px;border-bottom:2px solid var(--bg-soft);padding-bottom:16px}
.zone-head h2{font-size:24px;color:var(--navy)}
.tags{display:flex;flex-wrap:wrap;gap:8px}
.tags span{background:var(--bg-soft);border:1px solid var(--silver-light);color:var(--gray);font-size:13px;padding:5px 14px;border-radius:30px}
.tags span.hot{background:var(--navy);color:#fff;border-color:var(--navy)}
.prod-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.prod-card{border:1px solid var(--silver-light);border-radius:var(--radius);overflow:hidden;transition:.25s;display:flex;flex-direction:column;background:var(--white)}
.prod-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.prod-card .img-placeholder{border:none;border-radius:0;min-height:170px}
.prod-info{padding:16px 16px 18px;display:flex;flex-direction:column;flex:1}
.prod-info h4{font-size:16px;color:var(--dark-gray);margin-bottom:8px}
.prod-info .meta{font-size:13px;color:var(--text-soft);margin-bottom:6px}
.prod-info .meta b{color:var(--gray);font-weight:600}
.prod-info .btn{margin-top:auto}

/* ============ 通用服务 ============ */
.svc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.svc-card{background:var(--white);border-radius:var(--radius);padding:28px 24px;box-shadow:var(--shadow);border-left:3px solid var(--navy)}
.svc-card h4{color:var(--navy);font-size:18px;margin-bottom:12px}
.svc-card ul li{padding-left:18px;position:relative;color:var(--text-soft);font-size:14px;margin-bottom:6px}
.svc-card ul li::before{content:"▸";position:absolute;left:0;color:var(--navy)}

/* ============ 联系我们页 ============ */
.contact-wrap{display:grid;grid-template-columns:1fr 1.2fr 1.1fr;gap:28px;align-items:start}
.info-card,.form-card,.map-card{background:var(--white);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);border:1px solid var(--silver-light)}
.info-card h3,.form-card h3{color:var(--navy);font-size:20px;margin-bottom:18px}
.info-row{display:flex;gap:12px;padding:12px 0;border-bottom:1px dashed var(--silver-light);font-size:14px}
.info-row:last-child{border-bottom:none}
.info-row .label{color:var(--gray);font-weight:600;min-width:74px}
.info-row .val{color:var(--text);flex:1}
.info-row a.val{color:var(--navy);font-weight:600}
.info-row a.val:hover{text-decoration:underline}
.wa-badge{display:flex;align-items:center;gap:12px;margin-top:18px;padding:16px;background:var(--navy-grad);border-radius:var(--radius);color:#fff}
.wa-badge .wa-ico{width:46px;height:46px;border-radius:50%;background:#25D366;display:flex;align-items:center;justify-content:center;font-size:24px;font-weight:700;color:#fff;flex-shrink:0}
.wa-badge div small{display:block;opacity:.85;font-size:12px}
.wa-badge div b{font-size:16px}

.form-card label{display:block;font-size:13px;color:var(--gray);font-weight:600;margin:14px 0 6px}
.form-card input,.form-card select,.form-card textarea{
  width:100%;padding:11px 12px;border:1px solid var(--silver);border-radius:4px;
  font-size:14px;font-family:inherit;background:#fff;color:var(--text);transition:.2s;
}
.form-card input:focus,.form-card select:focus,.form-card textarea:focus{border-color:var(--navy);outline:none;box-shadow:0 0 0 3px rgba(22,51,92,.12)}
.form-card textarea{resize:vertical;min-height:90px}
.map-card{padding:0;overflow:hidden}
.map-card iframe{width:100%;height:360px;border:0;display:block}
.map-note{padding:14px 18px;font-size:13px;color:var(--text-soft);background:var(--bg-soft)}

/* ============ 底部 CTA 横幅 ============ */
.cta-banner{background:var(--navy-grad);color:#fff;text-align:center;padding:48px 20px}
.cta-banner h2{font-size:clamp(22px,3vw,30px);margin-bottom:10px}
.cta-banner p{color:var(--silver-light);margin-bottom:24px}
.cta-banner .hero-actions{justify-content:center}

/* ============ Footer ============ */
.site-footer{background:var(--dark-gray);color:var(--silver-light);padding:50px 0 24px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:32px;margin-bottom:30px}
.footer-col h4{color:#fff;font-size:16px;margin-bottom:16px;padding-bottom:8px;border-bottom:1px solid rgba(255,255,255,.12)}
.footer-col p,.footer-col a{font-size:13.5px;color:var(--silver);line-height:1.9}
.footer-col a:hover{color:#fff}
.footer-brand .logo-placeholder{margin-bottom:14px;background:linear-gradient(135deg,#3a3f47,#2b2f36)}
.footer-social a{display:inline-flex;align-items:center;gap:8px;background:#25D366;color:#fff;padding:8px 14px;border-radius:30px;font-size:13px;font-weight:600;margin-top:6px}
.footer-social a:hover{opacity:.9}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding-top:18px;text-align:center;font-size:12.5px;color:var(--silver)}
.footer-bottom a{color:var(--silver)}
.footer-bottom a:hover{color:#fff}

/* ============ 悬浮 WhatsApp 按钮（全站） ============ */
.wa-float{
  position:fixed;right:22px;bottom:22px;z-index:1200;
  width:58px;height:58px;border-radius:50%;
  background:#25D366;color:#fff;display:flex;align-items:center;justify-content:center;
  font-size:28px;font-weight:700;box-shadow:0 6px 18px rgba(37,211,102,.5);
  transition:transform .2s;
}
.wa-float:hover{transform:scale(1.08);color:#fff}
.wa-float span{position:absolute;bottom:64px;right:0;background:var(--navy);color:#fff;font-size:12px;padding:5px 10px;border-radius:4px;white-space:nowrap;opacity:0;pointer-events:none;transition:.2s}
.wa-float:hover span{opacity:1}

/* ============ 表单提交弹窗 Modal ============ */
.modal-mask{position:fixed;inset:0;background:rgba(22,51,92,.55);z-index:1500;display:none;align-items:center;justify-content:center;padding:20px}
.modal-mask.show{display:flex}
.modal{background:#fff;border-radius:var(--radius);max-width:420px;width:100%;padding:34px 28px;text-align:center;box-shadow:var(--shadow-hover)}
.modal .m-ico{width:64px;height:64px;border-radius:50%;background:#25D366;color:#fff;font-size:34px;display:flex;align-items:center;justify-content:center;margin:0 auto 16px}
.modal h3{color:var(--navy);font-size:21px;margin-bottom:10px}
.modal p{color:var(--text-soft);font-size:14px;margin-bottom:22px}

/* ============ 响应式 ============ */
@media(max-width:1024px){
  .adv-grid,.ind-grid,.cert-grid,.prod-grid,.culture-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
  .contact-wrap{grid-template-columns:1fr}
  .map-card iframe{height:300px}
}
@media(max-width:768px){
  :root{--header-h:60px}
  .nav-toggle{display:block}
  .main-nav{
    position:absolute;top:var(--header-h);left:0;right:0;background:var(--dark-gray);
    max-height:0;overflow:hidden;transition:max-height .3s ease;
  }
  .main-nav.open{max-height:320px;border-top:1px solid rgba(255,255,255,.1)}
  .main-nav ul{flex-direction:column;padding:8px}
  .main-nav a{padding:12px 16px}
  .nav-cta{display:none}
  .biz-grid{grid-template-columns:1fr}
  .thumb-grid{grid-template-columns:repeat(3,1fr)}
  .adv-grid,.ind-grid,.cert-grid,.prod-grid,.culture-grid,.team-grid,.svc-grid,.footer-grid{grid-template-columns:1fr}
  .hero{height:70vh;min-height:440px}
  .wa-float{width:48px;height:48px;font-size:24px;right:14px;bottom:14px}
  .section{padding:48px 0}
}