/* ============================================================
   昆山勤道源工业材料有限公司 · 站点样式
   设计原则：信息密度优先、零外部依赖、加载极快
   （AI 爬虫和用户都偏爱快且结构清晰的页面）
   ============================================================ */

:root{
  --ink:#0f1620;
  --body:#364150;
  --muted:#6b7684;
  --line:#e3e7ec;
  --bg:#ffffff;
  --bg-alt:#f7f9fb;
  --brand:#14344f;
  --brand-l:#eaf0f5;
  --copper:#a8622a;
  --copper-l:#f8f1ea;
}

*{box-sizing:border-box;margin:0;padding:0;}

html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}

body{
  background:var(--bg);
  color:var(--body);
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}

img{max-width:100%;display:block;}
a{color:var(--brand);text-decoration:none;}
a:hover{color:var(--copper);}

.wrap{max-width:1140px;margin:0 auto;padding:0 24px;}

/* ---------- 顶部导航 ---------- */
.topbar{
  border-bottom:1px solid var(--line);
  background:#fff;
  position:sticky;top:0;z-index:50;
}
.topbar .wrap{
  display:flex;align-items:center;justify-content:space-between;
  height:68px;gap:24px;
}
.logo{display:flex;align-items:baseline;gap:10px;flex-shrink:0;}
.logo .cn{font-size:18px;font-weight:700;color:var(--ink);letter-spacing:.02em;}
.logo .en{font-size:11px;color:var(--muted);letter-spacing:.08em;text-transform:uppercase;}
nav{display:flex;gap:26px;align-items:center;}
nav a{font-size:14.5px;color:var(--body);font-weight:500;}
nav a:hover{color:var(--copper);}
.lang{font-size:13px;border:1px solid var(--line);padding:5px 12px;border-radius:3px;color:var(--muted);}
.lang:hover{border-color:var(--copper);color:var(--copper);}

@media(max-width:860px){
  nav{display:none;}
  .topbar .wrap{height:60px;}
}

/* ---------- Hero ---------- */
.hero{
  background:linear-gradient(150deg,#12293c 0%,#14344f 48%,#1d4a3c 100%);
  color:#fff;padding:72px 0 64px;
}
.hero .kicker{
  font-size:12px;letter-spacing:.16em;color:rgba(255,255,255,.55);
  text-transform:uppercase;margin-bottom:18px;
}
.hero h1{
  font-size:40px;line-height:1.28;font-weight:700;letter-spacing:-.01em;
  margin-bottom:20px;max-width:820px;
}
.hero .claim{
  font-size:17px;line-height:1.8;color:rgba(255,255,255,.8);
  max-width:720px;margin-bottom:34px;
}
.hero-facts{
  display:grid;grid-template-columns:repeat(4,1fr);gap:1px;
  background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.14);
  border-radius:3px;overflow:hidden;max-width:820px;
}
.hero-facts div{background:#14344f;padding:16px 18px;}
.hero-facts .n{font-size:22px;font-weight:700;color:#fff;line-height:1.3;}
.hero-facts .l{font-size:12px;color:rgba(255,255,255,.6);margin-top:4px;letter-spacing:.04em;}
@media(max-width:760px){
  .hero{padding:48px 0 44px;}
  .hero h1{font-size:28px;}
  .hero-facts{grid-template-columns:1fr 1fr;}
}

/* ---------- 区块 ---------- */
section{padding:64px 0;}
section.alt{background:var(--bg-alt);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}

h2{
  font-size:26px;color:var(--ink);font-weight:700;line-height:1.4;
  margin-bottom:10px;letter-spacing:-.005em;
}
h2 .sub{display:block;font-size:13px;color:var(--muted);font-weight:400;letter-spacing:.1em;text-transform:uppercase;margin-bottom:8px;}

/* 内页主标题（每页唯一 H1） */
h1.page-title{
  font-size:30px;color:var(--ink);font-weight:700;line-height:1.34;
  margin-bottom:12px;letter-spacing:-.01em;
}
h1.page-title .sub{
  display:block;font-size:13px;color:var(--muted);font-weight:400;
  letter-spacing:.1em;text-transform:uppercase;margin-bottom:8px;
}
h3{font-size:19px;color:var(--ink);font-weight:600;margin:32px 0 10px;}
h4{font-size:16px;color:var(--ink);font-weight:600;margin:22px 0 8px;}
p{margin-bottom:14px;}
.lede{font-size:16px;color:var(--body);max-width:860px;margin-bottom:28px;}

/* 首答块 —— AI 抽取的核心单元 */
.answer{
  border-left:3px solid var(--copper);
  background:var(--copper-l);
  padding:18px 22px;
  margin:0 0 26px;
  font-size:16px;
  line-height:1.8;
  color:var(--ink);
  max-width:900px;
}
.answer strong{color:var(--copper);font-weight:700;}

/* ---------- 卡片网格 ---------- */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:26px 0;}
.card{
  border:1px solid var(--line);border-radius:4px;padding:24px 22px;background:#fff;
  transition:border-color .18s,box-shadow .18s;
}
.card:hover{border-color:var(--copper);box-shadow:0 2px 12px rgba(20,52,79,.06);}
.card .tag{font-size:11px;letter-spacing:.12em;color:var(--copper);font-weight:700;text-transform:uppercase;margin-bottom:10px;}
.card h3{margin:0 0 8px;font-size:17px;}
.card p{font-size:14px;color:var(--muted);line-height:1.7;margin-bottom:12px;}
.card .more{font-size:13.5px;font-weight:600;color:var(--brand);}
@media(max-width:860px){.cards{grid-template-columns:1fr;}}

/* ---------- 双业务分流 ---------- */
.biz{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:26px 0;}
.biz>div{border:1px solid var(--line);border-radius:4px;padding:28px 26px;background:#fff;transition:border-color .18s;}
.biz>div:hover{border-color:var(--copper);}
.biz .tag{font-size:11px;letter-spacing:.12em;color:var(--copper);font-weight:700;text-transform:uppercase;margin-bottom:10px;}
.biz h3{margin:0 0 10px;font-size:19px;}
.biz p{font-size:14px;color:var(--muted);line-height:1.7;margin-bottom:14px;}
.biz ul{list-style:none;margin:0 0 16px;}
.biz li{font-size:14px;color:var(--body);padding:7px 0;border-bottom:1px dashed var(--line);}
.biz li:last-child{border-bottom:none;}
.biz .more{font-size:13.5px;font-weight:600;color:var(--brand);}
@media(max-width:860px){.biz{grid-template-columns:1fr;}}

/* ---------- 表格 ---------- */
.table-wrap{overflow-x:auto;margin:20px 0;border:1px solid var(--line);border-radius:4px;}
table{width:100%;border-collapse:collapse;font-size:14.5px;background:#fff;min-width:560px;}
th{
  background:#f2f5f8;color:var(--ink);font-weight:600;text-align:left;
  padding:12px 14px;border-bottom:2px solid var(--line);
  font-size:13px;letter-spacing:.02em;white-space:nowrap;
}
td{padding:12px 14px;border-bottom:1px solid var(--line);vertical-align:top;line-height:1.65;}
tr:last-child td{border-bottom:none;}
td strong{color:var(--ink);}
tbody tr:hover{background:#fafbfc;}

/* ---------- FAQ ---------- */
.faq-list{max-width:900px;margin-top:24px;}
details{
  border:1px solid var(--line);border-radius:4px;margin-bottom:10px;background:#fff;
}
details[open]{border-color:var(--copper);}
summary{
  padding:18px 22px;cursor:pointer;font-weight:600;color:var(--ink);font-size:16px;
  list-style:none;position:relative;padding-right:52px;line-height:1.6;
}
summary::-webkit-details-marker{display:none;}
summary::after{
  content:"+";position:absolute;right:22px;top:16px;
  font-size:22px;font-weight:400;color:var(--copper);line-height:1;
}
details[open] summary::after{content:"−";}
.faq-body{padding:0 22px 20px;font-size:15px;line-height:1.85;color:var(--body);}
.faq-body p{margin-bottom:12px;}
.faq-body p:last-child{margin-bottom:0;}
.faq-body .meta{
  margin-top:14px;padding-top:12px;border-top:1px dashed var(--line);
  font-size:12.5px;color:var(--muted);
}

/* ---------- 牌号标签 ---------- */
.grades{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0 24px;}
.grades span{
  font-family:ui-monospace,"Cascadia Mono",Consolas,monospace;
  font-size:13px;background:var(--brand-l);color:var(--brand);
  padding:5px 11px;border-radius:3px;border:1px solid #d8e3ec;
}

/* ---------- 能力条 ---------- */
.caps{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:4px;overflow:hidden;margin:26px 0;}
.caps>div{background:#fff;padding:22px 20px;}
.caps .v{font-size:24px;font-weight:700;color:var(--brand);line-height:1.2;}
.caps .v small{font-size:14px;font-weight:500;color:var(--muted);}
.caps .k{font-size:13px;color:var(--muted);margin-top:6px;}
@media(max-width:760px){.caps{grid-template-columns:1fr 1fr;}}

/* ---------- CTA ---------- */
.cta{
  background:var(--brand);color:#fff;border-radius:4px;
  padding:40px 44px;margin:8px 0 0;
  display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;
}
.cta h3{color:#fff;margin:0 0 8px;font-size:21px;}
.cta p{color:rgba(255,255,255,.75);margin:0;font-size:14.5px;max-width:560px;}
.btn{
  display:inline-block;background:var(--copper);color:#fff;
  padding:13px 28px;border-radius:3px;font-weight:600;font-size:15px;
  white-space:nowrap;transition:background .18s;
}
.btn:hover{background:#8f5222;color:#fff;}
.btn.ghost{background:transparent;border:1px solid rgba(255,255,255,.4);}
.btn.ghost:hover{background:rgba(255,255,255,.1);}

/* ---------- 联系页 ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;margin-top:28px;}
@media(max-width:760px){.contact-grid{grid-template-columns:1fr;gap:28px;}}
.info-row{display:flex;gap:14px;padding:14px 0;border-bottom:1px solid var(--line);}
.info-row:last-child{border-bottom:none;}
.info-row .k{flex:0 0 96px;font-size:13.5px;color:var(--muted);}
.info-row .v{font-size:15px;color:var(--ink);font-weight:500;}
.info-row .v a{color:var(--ink);}
.info-row .v a:hover{color:var(--copper);}

/* ---------- 面包屑 ---------- */
.crumb{font-size:13px;color:var(--muted);padding:16px 0 0;}
.crumb a{color:var(--muted);}
.crumb a:hover{color:var(--copper);}
.crumb span{margin:0 7px;color:#c3cad2;}

/* ---------- 页脚 ---------- */
footer{
  border-top:1px solid var(--line);background:#fbfcfd;
  padding:52px 0 32px;margin-top:20px;font-size:14px;
}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:36px;margin-bottom:36px;}
.foot-grid h4{font-size:13px;color:var(--ink);letter-spacing:.06em;margin:0 0 14px;text-transform:uppercase;}
.foot-grid ul{list-style:none;}
.foot-grid li{margin-bottom:8px;}
.foot-grid a{color:var(--muted);font-size:14px;}
.foot-grid a:hover{color:var(--copper);}
.foot-about p{color:var(--muted);font-size:13.5px;line-height:1.8;max-width:340px;}
.foot-bottom{
  border-top:1px solid var(--line);padding-top:22px;
  display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;
  font-size:12.5px;color:#8a949e;
}
@media(max-width:860px){.foot-grid{grid-template-columns:1fr 1fr;}}

/* ---------- 打印 / 无障碍 ---------- */
@media print{
  .topbar,.cta,footer{display:none;}
  body{font-size:11pt;}
}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);}

/* ============================================================
   询盘组件：浮动联系按钮 + 微信弹窗 + 询价表单
   ============================================================ */
.float-contact{
  position:fixed;right:18px;bottom:22px;z-index:80;
  display:flex;flex-direction:column;gap:10px;align-items:flex-end;
}
.fc-btn{
  display:inline-flex;align-items:center;gap:9px;
  padding:11px 16px;border-radius:999px;border:none;cursor:pointer;
  font-family:inherit;font-size:14px;font-weight:600;color:#fff;
  box-shadow:0 6px 20px rgba(15,22,32,.18);
  transition:transform .16s,box-shadow .16s,filter .16s;
  text-decoration:none;
}
.fc-btn:hover{transform:translateY(-2px);box-shadow:0 10px 26px rgba(15,22,32,.24);color:#fff;}
.fc-wa{background:#25d366;}
.fc-wx{background:#0fae5c;}
@media(max-width:640px){
  .fc-btn span{display:none;}
  .fc-btn{padding:13px;border-radius:50%;}
  .float-contact{right:14px;bottom:16px;}
}
.wx-modal{
  position:fixed;inset:0;background:rgba(15,22,32,.5);z-index:90;
  display:none;align-items:center;justify-content:center;padding:20px;
}
.wx-modal.on{display:flex;}
.wx-card{background:#fff;border-radius:6px;padding:28px;max-width:340px;width:100%;text-align:center;}
.wx-card h4{font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-weight:600;margin-bottom:10px;}
.wx-id{font-size:24px;font-weight:700;color:var(--ink);letter-spacing:.04em;margin-bottom:6px;}
.wx-tip{font-size:13px;color:var(--muted);margin-bottom:20px;}
.wx-actions{display:flex;gap:10px;justify-content:center;}
.wx-actions .btn{padding:10px 18px;font-size:14px;}
.wx-actions .btn.ghost{background:#fff;border:1px solid var(--line);color:var(--body);}
.wx-actions .btn.ghost:hover{background:var(--bg-alt);color:var(--ink);}

/* 询价表单 */
.inq-form{background:var(--bg-alt);border:1px solid var(--line);border-radius:4px;padding:26px;margin-top:26px;}
.inq-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px 16px;}
.inq-grid .full{grid-column:1/-1;}
@media(max-width:640px){.inq-grid{grid-template-columns:1fr;}}
.field label{display:block;font-size:12.5px;color:var(--muted);margin-bottom:5px;letter-spacing:.02em;}
.field input,.field select,.field textarea{
  width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:3px;
  font-family:inherit;font-size:14.5px;color:var(--ink);background:#fff;
}
.field input:focus,.field select:focus,.field textarea:focus{outline:2px solid var(--brand-l);border-color:var(--brand);}
.field textarea{min-height:88px;resize:vertical;}
.inq-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:20px;}
.inq-actions .btn{border:none;cursor:pointer;font-family:inherit;}
.inq-actions .btn.wa{background:#25d366;}
.inq-actions .btn.wa:hover{background:#1eb457;}
.inq-actions .btn.mail{background:#fff;border:1px solid var(--line);color:var(--ink);}
.inq-actions .btn.mail:hover{background:#fff;border-color:var(--brand);color:var(--brand);}
.form-hint{display:none;margin-top:14px;font-size:13px;color:var(--copper);background:var(--copper-l);border-left:3px solid var(--copper);padding:10px 12px;border-radius:2px;}
.form-hint.on{display:block;}
.inq-note{font-size:12.5px;color:var(--muted);margin-top:12px;line-height:1.7;}