/* =====================================================
   南京鹅卵石 新版网站 公共样式 style.css
   ===================================================== */
:root{
  --primary:#1f6f8b;
  --primary-dark:#155263;
  --accent:#e8a33d;
  --bg:#f7f8fa;
  --card:#ffffff;
  --text:#2c3340;
  --muted:#6b7280;
  --radius:14px;
  --shadow:0 6px 24px rgba(21,82,99,.10);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Microsoft YaHei","PingFang SC","Helvetica Neue",Arial,sans-serif;color:var(--text);background:var(--bg);line-height:1.7}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
.container{width:100%;max-width:1160px;margin:0 auto;padding:0 20px}

/* ---------- 顶部导航 ---------- */
.topbar{background:var(--primary-dark);color:#cfe6ee;font-size:13px;padding:6px 0}
.topbar .container{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:4px}
.topbar a{color:#ffd98a}
header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);box-shadow:0 2px 12px rgba(0,0,0,.06)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px}
.brand .mark{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,#9fb8b0,#5d8a7e);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:bold;font-size:13px;letter-spacing:1px;flex-shrink:0}
.brand h1{font-size:21px;color:var(--primary-dark);letter-spacing:2px}
.brand small{display:block;font-size:11px;color:var(--muted);letter-spacing:3px;font-weight:normal}
.nav-links{display:flex;gap:6px}
.nav-links a{padding:8px 16px;border-radius:8px;font-size:15px;font-weight:500;color:#3d4653;transition:.2s}
.nav-links a:hover,.nav-links a.active{background:#e8f1f4;color:var(--primary)}
.nav-toggle{display:none;font-size:26px;background:none;border:0;color:var(--primary-dark);cursor:pointer;padding:8px}

/* ---------- 内页横幅与面包屑 ---------- */
.page-banner{background:linear-gradient(135deg,#155263 0%,#1f6f8b 60%,#3c8dad 100%);color:#fff;text-align:center;padding:64px 20px}
.page-banner h2{font-size:clamp(26px,4vw,38px);letter-spacing:3px;text-shadow:0 2px 10px rgba(0,0,0,.2)}
.page-banner p{color:#d5e9f0;margin-top:8px;font-size:15px}
.breadcrumb{font-size:14px;color:var(--muted);padding:16px 0}
.breadcrumb a{color:var(--primary)}
.breadcrumb span{margin:0 8px;color:#c3ccd4}

/* ---------- 横幅（首页） ---------- */
.hero{position:relative;color:#fff;text-align:center;overflow:hidden;background:linear-gradient(160deg,#155263 0%,#1f6f8b 55%,#3c8dad 100%);padding:110px 20px 130px}
.hero::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:70px;background:var(--bg);clip-path:ellipse(60% 100% at 50% 100%)}
.hero h2{font-size:clamp(28px,5vw,50px);letter-spacing:4px;text-shadow:0 2px 14px rgba(0,0,0,.25)}
.hero p{max-width:640px;margin:18px auto 0;font-size:clamp(15px,2vw,18px);color:#dbeef5}
.hero .stones{position:absolute;bottom:24px;left:0;width:100%;height:60px;opacity:.5;pointer-events:none}
.hero .stones i{position:absolute;bottom:0;border-radius:50% 50% 45% 45%;background:radial-gradient(circle at 35% 30%,#c9d8d2,#7fa193 60%,#5d8a7e)}
.btn{display:inline-block;margin-top:32px;padding:14px 38px;border-radius:999px;font-size:17px;font-weight:bold;letter-spacing:2px;transition:.25s}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 8px 20px rgba(232,163,61,.4)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(232,163,61,.5)}
.btn-ghost{margin-left:14px;border:2px solid rgba(255,255,255,.7);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.15)}

/* ---------- 通用区块 ---------- */
section{padding:70px 0}
.sec-head{text-align:center;margin-bottom:44px}
.sec-head .tag{display:inline-block;background:#e8f1f4;color:var(--primary);font-size:13px;padding:4px 16px;border-radius:999px;letter-spacing:2px}
.sec-head h3{font-size:clamp(22px,3vw,32px);margin-top:12px;letter-spacing:2px}
.sec-head p{color:var(--muted);margin-top:8px}

/* ---------- 优势 ---------- */
.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:22px}
.feature{background:var(--card);border-radius:var(--radius);padding:30px 24px;text-align:center;box-shadow:var(--shadow);transition:.25s}
.feature:hover{transform:translateY(-6px)}
.feature .ico{width:62px;height:62px;margin:0 auto 14px;border-radius:18px;background:linear-gradient(135deg,#e8f1f4,#d2e6ee);display:flex;align-items:center;justify-content:center}
.feature .ico svg{width:30px;height:30px;stroke:var(--primary);fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.feature h4{font-size:17px;margin-bottom:8px;color:var(--primary-dark)}
.feature p{font-size:14px;color:var(--muted)}

/* ---------- 产品/新闻卡片 ---------- */
#products{background:linear-gradient(180deg,#fff 0%,var(--bg) 100%)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:24px}
.card{background:var(--card);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:.25s;display:block}
.card:hover{transform:translateY(-6px);box-shadow:0 14px 32px rgba(21,82,99,.16)}
.card .pic{position:relative;overflow:hidden;aspect-ratio:4/3}
.card .pic img{width:100%;height:100%;object-fit:cover;transition:.4s}
.card:hover .pic img{transform:scale(1.06)}
.card .pic .badge{position:absolute;top:10px;left:10px;background:rgba(31,111,139,.9);color:#fff;font-size:12px;padding:3px 12px;border-radius:999px}
.card .info{padding:16px 18px 20px}
.card .info h4{font-size:15.5px;color:var(--text)}
.card .info p{font-size:13px;color:var(--muted);margin-top:4px}
.card .info .more{display:inline-block;margin-top:10px;font-size:13px;color:var(--primary);font-weight:bold}

/* ---------- 关于 ---------- */
.about-wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center}
.about-wrap .pic{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.about-wrap h3{font-size:26px;color:var(--primary-dark);margin-bottom:16px;letter-spacing:1px}
.about-wrap p{color:#4a5563;margin-bottom:12px}
.about-points{margin:18px 0 26px}
.about-points li{padding-left:26px;position:relative;margin-bottom:8px;color:#4a5563}
.about-points li::before{content:"✔";position:absolute;left:0;color:var(--accent);font-weight:bold}

/* ---------- 案例 ---------- */
#cases{background:#eef4f6}
.case-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.case{position:relative;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);aspect-ratio:4/3;display:block}
.case img{width:100%;height:100%;object-fit:cover;transition:.4s}
.case:hover img{transform:scale(1.06)}
.case .cap{position:absolute;left:0;right:0;bottom:0;padding:36px 18px 14px;background:linear-gradient(transparent,rgba(13,40,52,.85));color:#fff;font-size:15px;font-weight:500}

/* ---------- 筛选标签 ---------- */
.filter{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-bottom:34px}
.filter a{padding:8px 24px;border-radius:999px;background:#fff;border:1px solid #dfe6ea;font-size:14px;color:#4a5563;transition:.2s}
.filter a:hover,.filter a.active{background:var(--primary);border-color:var(--primary);color:#fff}

/* ---------- 分页（链接式，支持服务端分页） ---------- */
.pagination{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin-top:16px}
.pagination a,.pagination button,.pagination span{min-width:40px;height:40px;display:inline-flex;align-items:center;justify-content:center;padding:0 16px;border-radius:10px;border:1px solid #dfe6ea;background:#fff;color:#4a5563;font-size:14px;text-align:center;transition:.2s}
.pagination a:hover,.pagination button:hover{border-color:var(--primary);color:var(--primary)}
.pagination span.active,.pagination button.active{background:var(--primary);border-color:var(--primary);color:#fff;font-weight:bold}
.pagination span.pg-disabled{opacity:.4;cursor:not-allowed}
.page-info{text-align:center;color:var(--muted);font-size:13px;margin:6px 0 0}

/* ---------- 详情页 ---------- */
.detail-wrap{display:grid;grid-template-columns:1fr 300px;gap:30px;align-items:start;padding-bottom:70px}
.detail-main{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:34px;overflow:hidden}
.detail-main .bigpic{border-radius:10px;overflow:hidden;margin-bottom:22px}
.detail-main h1,.detail-main .art-title{font-size:clamp(20px,2.6vw,27px);color:var(--primary-dark);line-height:1.5;margin-bottom:6px}
.art-meta{font-size:13px;color:var(--muted);padding-bottom:18px;border-bottom:1px dashed #e2e8ec;margin-bottom:20px}
.art-meta span{margin-right:18px}
.detail-body{font-size:15.5px;color:#3d4653}
.detail-body p{margin-bottom:14px}
.detail-body img{border-radius:10px;margin:12px auto}
.detail-table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14px}
.detail-table th,.detail-table td{border:1px solid #e2e8ec;padding:10px 14px;text-align:left}
.detail-table th{background:#eef5f8;color:var(--primary-dark);white-space:nowrap}
.pager{margin-top:28px;padding-top:18px;border-top:1px dashed #e2e8ec;font-size:14px}
.pager a{display:block;color:var(--primary);padding:4px 0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.pager a:hover{text-decoration:underline}
/* 详情页侧栏 */
.side{display:flex;flex-direction:column;gap:22px;position:sticky;top:90px}
.side-card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}
.side-card h4{font-size:17px;color:var(--primary-dark);padding-bottom:12px;border-bottom:2px solid var(--accent);margin-bottom:14px}
.side-card li{margin-bottom:10px;font-size:14px}
.side-card li a{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:#4a5563}
.side-card li a:hover{color:var(--primary)}
.side-card li a::before{content:"· ";color:var(--accent);font-weight:bold}
.side-card .phone{display:block;text-align:center;background:var(--accent);color:#fff;font-size:19px;font-weight:bold;padding:12px;border-radius:10px;letter-spacing:1px}
.side-card .phone:hover{opacity:.92}
.side-card .qr{text-align:center;font-size:13px;color:var(--muted)}
.side-card .qr img{width:140px;margin:0 auto 6px;border-radius:8px}
/* 联系页 */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px;padding-bottom:70px}
.contact-card{background:var(--card);border-radius:var(--radius);padding:34px;box-shadow:var(--shadow)}
.contact-card h4{font-size:19px;color:var(--primary-dark);margin-bottom:18px}
.contact-card li{display:flex;gap:12px;margin-bottom:14px;color:#4a5563}
.contact-card li b{color:var(--text);min-width:64px}
.contact-card .phone{font-size:26px;color:var(--accent);font-weight:bold;letter-spacing:1px}
.cta-box{background:linear-gradient(135deg,#155263,#1f6f8b);border-radius:var(--radius);padding:40px 34px;color:#fff;display:flex;flex-direction:column;justify-content:center}
.cta-box h4{font-size:24px;letter-spacing:1px;margin-bottom:12px}
.cta-box p{color:#d5e9f0;margin-bottom:24px}
.cta-box .phone{font-size:clamp(26px,3.4vw,36px);font-weight:bold;color:#ffd98a;letter-spacing:1px}
.map-box{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);margin-bottom:70px;background:var(--card);padding:20px}
.map-box iframe{width:100%;height:340px;border:0;border-radius:10px}

/* ---------- 页脚 ---------- */
footer{background:#122a35;color:#9fb8c2;padding:44px 0 24px;font-size:14px}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.15fr;gap:32px;margin-bottom:30px}
footer h5{color:#fff;font-size:16px;margin-bottom:14px}
footer a:hover{color:#ffd98a}
.foot-links li{margin-bottom:8px}
.foot-qr img{width:132px;height:132px;border-radius:10px;background:#fff;padding:5px;margin-bottom:8px}
.foot-qr p{font-size:13px;color:#9fb8c2}
.copyright{border-top:1px solid #24404d;padding-top:18px;text-align:center;font-size:13px;color:#6e8b99}

/* ---------- 回到顶部 ---------- */
#backtop{position:fixed;right:20px;bottom:24px;width:46px;height:46px;border-radius:50%;background:var(--primary);color:#fff;border:0;font-size:20px;cursor:pointer;box-shadow:0 6px 16px rgba(21,82,99,.35);opacity:0;pointer-events:none;transition:.3s;z-index:99}
#backtop.show{opacity:1;pointer-events:auto}

/* ---------- 响应式 ---------- */
@media (max-width:960px){
  .detail-wrap{grid-template-columns:1fr}
  .side{position:static}
  .contact-grid{grid-template-columns:1fr}
}
@media (max-width:860px){
  .nav-links{position:absolute;top:68px;left:0;right:0;background:#fff;flex-direction:column;padding:10px 16px 16px;box-shadow:0 12px 20px rgba(0,0,0,.08);display:none}
  .nav-links.open{display:flex}
  .nav-toggle{display:block}
  .about-wrap{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .foot-qr{grid-column:span 2}
}
@media (max-width:520px){
  .grid{grid-template-columns:repeat(2,1fr)}
  .case-grid{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr}
  .btn-ghost{margin-left:0;margin-top:12px}
  .detail-main{padding:22px 18px}
  section{padding:50px 0}
}