/* =========================================================
   成都市天恒广告有限公司官网 - 前台样式
   主题色：蓝色(主) + 黄色(辅助)
   ========================================================= */
:root{
  --blue:#1a73e8;
  --blue-dark:#0d47a1;
  --blue-deep:#0b3d91;
  --yellow:#f7b500;
  --yellow-dark:#e6a800;
  --text:#333;
  --text-light:#666;
  --bg:#f5f7fb;
  --border:#e6ecf6;
  --radius:8px;
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;color:var(--text);font-size:14px;line-height:1.7;background:#fff}
a{text-decoration:none;color:inherit;transition:.25s}
img{max-width:100%;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 16px}
.muted{color:var(--text-light)}
h1,h2,h3,h4{font-weight:700}

/* ================= 顶部信息条 ================= */
.topbar{background:var(--blue-deep);color:#fff;font-size:13px}
.topbar .container{display:flex;justify-content:space-between;align-items:center;height:38px}
.topbar a{color:#fff;opacity:.9}
.topbar a:hover{opacity:1;color:var(--yellow)}

/* ================= 头部导航 ================= */
.header{background:#fff;border-bottom:2px solid var(--yellow);position:sticky;top:0;z-index:100;box-shadow:0 1px 6px rgba(26,115,232,.08)}
.header .container{display:flex;align-items:center;justify-content:space-between;height:80px}
.logo{display:flex;align-items:center;gap:12px}
.logo img{height:52px;width:auto}
.logo .logo-text{line-height:1.3}
.logo .logo-text b{font-size:22px;color:var(--blue-dark);letter-spacing:2px}
.logo .logo-text span{display:block;font-size:12px;color:var(--text-light);letter-spacing:3px}
.nav{display:flex;gap:4px;align-items:center}
.nav a{padding:10px 16px;color:var(--text);font-size:15px;font-weight:500;border-radius:4px;position:relative}
.nav a:hover,.nav a.on{color:var(--blue)}
.nav a.on::after{content:"";position:absolute;left:16px;right:16px;bottom:4px;height:3px;background:var(--yellow);border-radius:2px}
.nav a.order-link{background:var(--yellow);color:#1a1a1a;border-radius:20px;padding:8px 20px;font-weight:700}
.nav a.order-link:hover{background:var(--yellow-dark);color:#1a1a1a}
.nav-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.nav-toggle span{width:24px;height:3px;background:var(--blue-dark);border-radius:2px}

/* ================= Banner 轮播 ================= */
.banner{position:relative;height:520px;overflow:hidden;background:linear-gradient(135deg,#1a73e8,#0d47a1)}
.banner .slides{height:100%;position:relative}
.banner .slide{position:absolute;inset:0;opacity:0;transition:opacity .8s;display:flex;align-items:center;justify-content:center;flex-direction:column;text-align:center}
.banner .slide.on{opacity:1}
.banner .slide img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0}
.banner .slide .slide-txt{position:relative;z-index:2;color:#fff;padding:0 20px;text-shadow:0 2px 8px rgba(0,0,0,.3)}
.banner .slide h2{font-size:46px;letter-spacing:4px;margin-bottom:16px}
.banner .slide p{font-size:20px;opacity:.95;letter-spacing:2px}
.banner .dot-box{position:absolute;bottom:24px;left:0;right:0;display:flex;justify-content:center;gap:10px;z-index:3}
.banner .dot{width:34px;height:5px;border-radius:3px;background:rgba(255,255,255,.4);cursor:pointer}
.banner .dot.on{background:var(--yellow)}
@media(max-width:768px){.banner{height:300px}.banner .slide h2{font-size:26px}.banner .slide p{font-size:14px}}

/* ================= 板块标题 ================= */
.section{padding:64px 0}
.section.gray{background:var(--bg)}
.section-title{text-align:center;margin-bottom:44px}
.section-title h2{font-size:30px;color:var(--blue-dark);letter-spacing:3px}
.section-title .en{font-size:13px;color:var(--yellow-dark);letter-spacing:6px;text-transform:uppercase;margin-bottom:6px}
.section-title .line{width:60px;height:3px;background:var(--yellow);margin:14px auto 0;border-radius:2px}

/* ================= 业务范围 ================= */
.biz-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.biz-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:28px;transition:.3s;position:relative;overflow:hidden}
.biz-card::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:linear-gradient(180deg,var(--blue),var(--yellow));opacity:0;transition:.3s}
.biz-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(26,115,232,.14)}
.biz-card:hover::before{opacity:1}
.biz-card h3{color:var(--blue-dark);font-size:19px;margin-bottom:10px;display:flex;align-items:center;gap:8px}
.biz-card h3 i{font-style:normal;width:34px;height:34px;line-height:34px;text-align:center;background:linear-gradient(135deg,var(--blue),var(--blue-dark));color:#fff;border-radius:6px;font-size:16px}
.biz-card p{color:var(--text-light);font-size:13px}
.biz-card .more{display:inline-block;margin-top:14px;color:var(--blue);font-size:13px}
.biz-card .more:hover{color:var(--yellow-dark)}

/* ================= 产品中心 ================= */
.prod-filter{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-bottom:30px}
.prod-filter a{padding:7px 18px;border:1px solid var(--border);border-radius:20px;color:var(--text-light);font-size:13px}
.prod-filter a:hover,.prod-filter a.on{background:var(--blue);border-color:var(--blue);color:#fff}
.prod-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.prod-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:.3s}
.prod-card:hover{transform:translateY(-5px);box-shadow:0 10px 26px rgba(26,115,232,.15);border-color:var(--blue)}
.prod-card .pic{height:200px;overflow:hidden;background:linear-gradient(135deg,var(--blue),var(--blue-dark))}
.prod-card .pic img{width:100%;height:100%;object-fit:cover;transition:.4s}
.prod-card:hover .pic img{transform:scale(1.06)}
.prod-card .info{padding:18px}
.prod-card .info h3{font-size:17px;color:var(--blue-dark);margin-bottom:8px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.prod-card .info p{color:var(--text-light);font-size:13px;height:44px;overflow:hidden;margin-bottom:12px}
.prod-card .info .tag{font-size:12px;color:var(--blue)}
.prod-card .info .view{font-size:13px;color:var(--yellow-dark);font-weight:700}
@media(max-width:992px){.prod-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:768px){.prod-grid{grid-template-columns:repeat(2,1fr)}.biz-grid{grid-template-columns:1fr}}

/* ================= 案例 ================= */
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.case-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:.3s}
.case-card:hover{box-shadow:0 10px 26px rgba(26,115,232,.14);transform:translateY(-4px)}
.case-card .pic{height:220px;overflow:hidden;background:linear-gradient(135deg,var(--yellow),var(--yellow-dark))}
.case-card .pic img{width:100%;height:100%;object-fit:cover}
.case-card .info{padding:18px}
.case-card .info h3{font-size:16px;color:var(--blue-dark)}
.case-card .info p{color:var(--text-light);font-size:13px;margin-top:6px;height:44px;overflow:hidden}
@media(max-width:768px){.case-grid{grid-template-columns:repeat(2,1fr)}}

/* ================= 关于我们（首页） ================= */
.about-wrap{display:flex;gap:36px;align-items:center}
.about-wrap .pic{flex:1;border-radius:var(--radius);overflow:hidden}
.about-wrap .pic img{width:100%;height:340px;object-fit:cover}
.about-wrap .txt{flex:1.2}
.about-wrap .txt h3{color:var(--blue-dark);font-size:22px;margin-bottom:14px}
.about-wrap .txt p{color:var(--text-light);font-size:14px;margin-bottom:12px;text-align:justify}
.btn-blue{display:inline-block;background:linear-gradient(135deg,var(--blue),var(--blue-dark));color:#fff;padding:10px 26px;border-radius:24px;margin-top:8px;font-weight:600}
.btn-blue:hover{opacity:.9;color:#fff}
@media(max-width:768px){.about-wrap{flex-direction:column}}

/* ================= 资讯动态 ================= */
.news-list{max-width:900px;margin:0 auto}
.news-item{display:flex;gap:18px;background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:18px;margin-bottom:16px;transition:.3s}
.news-item:hover{box-shadow:0 6px 20px rgba(26,115,232,.12);border-color:var(--blue)}
.news-item .thumb{width:180px;height:120px;border-radius:6px;overflow:hidden;flex-shrink:0;background:linear-gradient(135deg,var(--blue),var(--blue-dark))}
.news-item .thumb img{width:100%;height:100%;object-fit:cover}
.news-item .con h3{font-size:17px;color:var(--blue-dark)}
.news-item .con h3:hover{color:var(--yellow-dark)}
.news-item .con p{color:var(--text-light);font-size:13px;margin-top:6px;height:42px;overflow:hidden}
.news-item .con .date{font-size:12px;color:#999;margin-top:8px;display:block}
@media(max-width:768px){.news-item .thumb{width:120px;height:90px}}

/* ================= 分页 ================= */
.pagination{display:flex;justify-content:center;gap:8px;margin-top:30px}
.pagination a,.pagination span{display:inline-block;min-width:36px;padding:7px 12px;border:1px solid var(--border);border-radius:4px;color:var(--text-light);text-align:center}
.pagination a:hover{border-color:var(--blue);color:var(--blue)}
.pagination .current{background:var(--blue);color:#fff;border-color:var(--blue)}

/* ================= 页脚 ================= */
.footer{background:var(--blue-deep);color:#cfe0ff;font-size:13px}
.footer .container{padding:48px 16px 30px}
.footer-grid{display:grid;grid-template-columns:2fr 1.4fr 1fr;gap:30px}
.footer h4{color:#fff;font-size:17px;margin-bottom:16px;position:relative;padding-bottom:10px}
.footer h4::after{content:"";position:absolute;left:0;bottom:0;width:36px;height:3px;background:var(--yellow);border-radius:2px}
.footer p{line-height:2.2}
.footer .qr{text-align:center}
.footer .qr img{width:110px;height:110px;background:#fff;padding:6px;border-radius:6px;margin:0 auto}
.footer .qr span{display:block;margin-top:8px;color:var(--yellow)}
.copyright{border-top:1px solid rgba(255,255,255,.12);margin-top:30px;padding-top:18px;text-align:center;font-size:12px;color:#8aa8e8}
.copyright a{color:#cfe0ff}
.copyright a:hover{color:var(--yellow)}
@media(max-width:768px){.footer-grid{grid-template-columns:1fr}}

/* ================= 内页通用 ================= */
.page-banner{height:200px;background:linear-gradient(135deg,var(--blue),var(--blue-deep));display:flex;align-items:center;justify-content:center;flex-direction:column;color:#fff}
.page-banner h1{font-size:32px;letter-spacing:3px}
.page-banner p{color:var(--yellow);margin-top:6px;letter-spacing:2px}
.crumb{background:var(--bg);padding:10px 0;font-size:13px;color:var(--text-light)}
.crumb a{color:var(--blue)}
.crumb a:hover{color:var(--yellow-dark)}
.page-main{padding:44px 0 56px}
.page-box{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:32px}
.page-box h2{color:var(--blue-dark);font-size:24px;margin-bottom:16px;padding-bottom:14px;border-bottom:2px solid var(--yellow)}

/* 详情页 */
.detail-title{font-size:26px;color:var(--blue-dark);text-align:center;margin-bottom:8px}
.detail-meta{text-align:center;color:#999;font-size:13px;margin-bottom:24px;padding-bottom:20px;border-bottom:1px solid var(--border)}
.detail-body{font-size:15px;color:var(--text);line-height:1.9}
.detail-body img{max-width:100%;border-radius:6px;margin:10px auto}
.detail-body p{margin:10px 0}

/* 联系我们 */
.contact-grid{display:grid;grid-template-columns:1.3fr 1fr;gap:30px}
.contact-item{display:flex;align-items:center;gap:16px;padding:18px;border:1px solid var(--border);border-radius:var(--radius);margin-bottom:16px}
.contact-item .icon{width:48px;height:48px;border-radius:10px;background:linear-gradient(135deg,var(--blue),var(--blue-dark));color:#fff;display:flex;align-items:center;justify-content:center;font-size:22px;flex-shrink:0}
.contact-item h4{color:var(--blue-dark);font-size:15px}
.contact-item p{color:var(--text-light);font-size:14px;margin-top:4px}
.map-box{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);height:340px;display:flex;align-items:center;justify-content:center;color:var(--text-light)}
@media(max-width:768px){.contact-grid{grid-template-columns:1fr}}

/* 订单查询按钮 */
.order-float{position:fixed;right:18px;bottom:18px;z-index:99}
.order-float a{display:flex;align-items:center;gap:8px;background:linear-gradient(135deg,var(--yellow),var(--yellow-dark));color:#1a1a1a;padding:12px 22px;border-radius:30px;font-weight:700;box-shadow:0 6px 18px rgba(0,0,0,.2)}
.order-float a:hover{transform:translateY(-2px)}

/* 右侧浮动联系方式（微信二维码/QQ/电话） */
.float-contact{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:98;display:flex;flex-direction:column;gap:10px}
.float-contact .fc-item{position:relative;width:46px;height:46px;border-radius:50%;background:linear-gradient(135deg,var(--blue),var(--blue-deep));color:#fff;display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 4px 12px rgba(0,0,0,.18);border:1px solid rgba(255,255,255,.25)}
.float-contact a.fc-item{text-decoration:none}
.float-contact .fc-item:hover{background:linear-gradient(135deg,var(--yellow),var(--yellow-dark));color:#1a1a1a}
.float-contact .fc-ic{font-style:normal;font-size:18px;font-weight:700}
.float-contact .fc-txt{display:none;position:absolute;right:56px;top:50%;transform:translateY(-50%);white-space:nowrap;background:#fff;border:1px solid var(--border);color:var(--text);padding:8px 14px;border-radius:6px;box-shadow:0 4px 14px rgba(0,0,0,.12);font-size:13px}
.float-contact .fc-qr{display:none;position:absolute;right:56px;top:50%;transform:translateY(-50%);background:#fff;border:1px solid var(--border);border-radius:8px;padding:8px;text-align:center;box-shadow:0 4px 14px rgba(0,0,0,.15)}
.float-contact .fc-qr img{width:112px;height:112px;display:block;margin:0 auto}
.float-contact .fc-qr span{font-size:12px;color:var(--text-light);display:block;margin-top:4px}
.float-contact .fc-item:hover .fc-txt,.float-contact .fc-item:hover .fc-qr{display:block}

/* 订单查询内嵌框 */
.order-frame{width:100%;height:calc(100vh - 130px);min-height:720px;border:0;display:block;background:#fff}
@media(max-width:768px){.order-frame{height:calc(100vh - 60px);min-height:520px}}

/* 空图占位 */
.noimg{display:flex;align-items:center;justify-content:center;height:100%;color:#fff;font-size:15px;font-weight:700;letter-spacing:2px}

/* ================= 手机端访问适配 ================= */
@media(max-width:768px){
  .topbar{display:none}                                   /* 顶部问候语在手机上隐藏 */
  .header .container{position:relative;height:60px}       /* 导航绝对定位的锚点 */
  .logo img{height:38px}
  .logo .logo-text b{font-size:17px;letter-spacing:1px}
  .logo .logo-text span{font-size:10px;letter-spacing:2px}
  /* 导航默认收起，点击汉堡展开为纵向下拉 */
  .nav{position:absolute;top:60px;left:0;right:0;display:none;flex-direction:column;align-items:stretch;
       background:#fff;border-bottom:2px solid var(--yellow);box-shadow:0 8px 20px rgba(0,0,0,.12);
       z-index:99;max-height:calc(100vh - 60px);overflow-y:auto}
  .nav.open{display:flex}
  .nav a{padding:14px 20px;border-bottom:1px solid #eef2f8;border-radius:0;font-size:15px}
  .nav a.on{color:var(--blue);background:#f0f6ff}
  .nav a.on::after{display:none}
  .nav a.order-link{border-radius:0;text-align:center;background:var(--yellow);color:#1a1a1a;font-weight:700}
  .nav-toggle{display:flex}                                /* 显示汉堡按钮 */
  /* 轮播与板块 */
  .banner{height:220px}
  .banner .slide h2{font-size:20px;letter-spacing:2px}
  .banner .slide p{font-size:13px}
  .banner .text{padding:0 16px}
  /* 产品标题/正文在手机上的间距 */
  .section-title{font-size:22px}
  /* 右侧浮动联系方式在手机上缩小并贴边，避免遮挡正文 */
  .float-contact{right:8px;gap:8px}
  .float-contact .fc-item{width:38px;height:38px}
  .float-contact .fc-ic{font-size:15px}
  .order-float{right:8px;bottom:12px}
  .order-float a{padding:9px 16px;font-size:13px}
  /* 页脚二维码图尺寸自适应 */
  .footer .qr img{width:100px;height:100px}
}