/* ============================================================
   RONGAI B2B 站 · 规划版设计系统（对应 Kadence 全局设置）
   品牌：深蓝 #1E3A5F / 工业橙 #E87722（#EA7A1F）
   事业部辅色：线束=橙 / TPMS=青 #0D9488
   字体：Inter（标题 800 / 正文 400），正文 16px，行高 1.65
   ============================================================ */
:root{
  --bg:#f6f7f9; --card:#ffffff;
  --ink:#182230; --muted:#5d6b7a; --line:#e2e6ec;
  --navy:#1e3a5f; --navy-deep:#152b47;
  --orange:#ea7a1f; --orange-d:#c9660f; --orange-soft:#ffb066;
  --teal:#0d9488; --teal-d:#0f766e; --teal-ink:#0b3f3a; --teal-soft:#5eead4;
  --max:1200px;
  --shadow:0 12px 30px rgba(24,34,48,.09);
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{font-family:"Inter","Segoe UI","Microsoft YaHei",system-ui,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.65;font-size:16px;}
img{max-width:100%;display:block;}
a{text-decoration:none;color:inherit;}
ul{list-style:none;}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px;}
section{padding:80px 0;}
.section-soft{background:#eef1f4;}
h1,h2,h3,h4{line-height:1.25;font-weight:800;letter-spacing:-.3px;}
h2{font-size:30px;}
h3{font-size:19px;}

/* ---- 草稿提示条（上线前删除） ---- */
.draftbar{background:#0f172a;color:#94a3b8;font-size:12px;text-align:center;padding:6px 16px;letter-spacing:.5px;}

/* ---- 顶栏（无 emoji，文字+线性图标） ---- */
.topbar{background:var(--navy-deep);color:#b9c5d3;font-size:13px;padding:8px 0;}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;}
.topbar a{color:#dce5ee;font-weight:600;}
.topbar a:hover{color:#fff;}
.topbar .tb-right{display:flex;gap:22px;align-items:center;}
.topbar svg{vertical-align:-3px;margin-right:6px;}

/* ---- 导航 ---- */
header.nav{position:sticky;top:0;z-index:50;background:rgba(246,247,249,.94);
  backdrop-filter:blur(8px);border-bottom:1px solid var(--line);}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:72px;gap:18px;}
.logo{display:flex;align-items:center;gap:11px;}
.logo .mark{width:40px;height:40px;border-radius:10px;flex:none;
  background:linear-gradient(135deg,var(--navy),var(--orange));
  display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:13px;letter-spacing:.5px;}
.logo b{font-size:20px;letter-spacing:1.5px;display:block;line-height:1.15;}
.logo small{display:block;font-size:10px;font-weight:700;letter-spacing:2.5px;color:var(--muted);text-transform:uppercase;}
.nav-links{display:flex;gap:26px;font-size:15px;font-weight:600;}
.nav-links a:hover,.nav-links a.active{color:var(--orange);}
.nav-right{display:flex;align-items:center;gap:12px;}
.has-drop{position:relative;}
.has-drop>a .caret{font-size:11px;color:var(--muted);}
.dropdown{display:none;position:absolute;top:30px;left:-16px;background:#fff;border:1px solid var(--line);
  border-radius:14px;padding:12px;min-width:270px;box-shadow:var(--shadow);}
.has-drop:hover .dropdown{display:block;}
.dropdown .dd-group{padding:4px 12px 8px;border-bottom:1px solid var(--line);margin-bottom:8px;}
.dropdown .dd-group:last-child{border:none;margin:0;}
.dropdown b{display:block;font-size:11px;letter-spacing:1.5px;text-transform:uppercase;margin-bottom:4px;}
.dd-g-h b{color:var(--orange-d);} .dd-g-t b{color:var(--teal);}
.dropdown a{display:block;font-size:14px;font-weight:400;padding:5px 8px;border-radius:8px;}
.dropdown a:hover{background:var(--bg);color:var(--ink);}
.dropdown .dd-all{font-weight:700;color:var(--navy);}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:6px;}
.nav-toggle span{display:block;width:24px;height:2.5px;background:var(--ink);margin:5px 0;border-radius:2px;}

/* ---- 按钮 ---- */
.btn{display:inline-block;padding:13px 28px;font-weight:700;border-radius:999px;font-size:15px;
  transition:.2s;cursor:pointer;border:none;font-family:inherit;}
.btn-orange{background:var(--orange);color:#fff;box-shadow:0 6px 16px rgba(234,122,31,.32);}
.btn-orange:hover{background:var(--orange-d);}
.btn-teal{background:var(--teal-d);color:#fff;box-shadow:0 6px 16px rgba(15,118,110,.28);}
.btn-teal:hover{background:var(--teal-ink);}
.btn-navy{background:var(--navy);color:#fff;}
.btn-navy:hover{background:var(--navy-deep);}
.btn-ghost{border:2px solid var(--ink);color:var(--ink);background:transparent;}
.btn-ghost:hover{background:var(--ink);color:#fff;}
.btn-ghost-light{border:2px solid rgba(255,255,255,.75);color:#fff;background:transparent;}
.btn-ghost-light:hover{background:#fff;color:var(--navy-deep);}
.btn-outline{border:2px solid var(--navy);color:var(--navy);background:transparent;}
.btn-outline:hover{background:var(--navy);color:#fff;}
.btn-nav{padding:10px 22px;font-size:14px;}
.btn-sm{padding:9px 18px;font-size:13.5px;}

/* ---- 通用小元素 ---- */
.kicker{font-size:12.5px;font-weight:800;letter-spacing:2px;color:var(--orange-d);
  text-transform:uppercase;display:inline-flex;align-items:center;gap:10px;margin-bottom:12px;}
.kicker::before{content:"";width:26px;height:3px;border-radius:2px;background:var(--navy);}
.kicker.k-teal{color:var(--teal);} .kicker.k-teal::before{background:var(--teal);}
.sec-head{max-width:760px;margin-bottom:44px;}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center;}
.sec-head.center .kicker::before{display:none;}
.sec-head h2{margin-bottom:10px;}
.sec-head p{color:var(--muted);font-size:16.5px;}
.sub{color:var(--muted);}
.note{background:#fdf6ee;border:1px solid #f3ddb8;border-left:5px solid var(--orange);
  border-radius:12px;padding:18px 22px;font-size:14.5px;color:#5a4a33;margin-top:34px;}
.note-teal{background:#effbf9;border-color:#bfe8e2;border-left-color:var(--teal);color:#2a4a45;}
.note b{color:var(--ink);}

/* ---- 首页 Hero：双事业部门卡 ---- */
.hero{padding:72px 0 84px;background:
  radial-gradient(640px 320px at 12% -10%, rgba(30,58,95,.10), transparent 60%),
  radial-gradient(640px 320px at 88% 110%, rgba(13,148,136,.10), transparent 60%),var(--bg);}
.hero-head{text-align:center;max-width:800px;margin:0 auto 50px;}
.hero-head h1{font-size:42px;letter-spacing:-.5px;margin-bottom:16px;}
.hero-head h1 em{font-style:normal;color:var(--navy);}
.hero-head p.lead{font-size:17px;color:var(--muted);}
.hero-head p.lead b{color:var(--ink);}
.split{display:grid;grid-template-columns:1fr 1fr;gap:26px;}
.dcard{border-radius:20px;padding:38px 36px 34px;color:#fff;position:relative;overflow:hidden;
  min-height:400px;display:flex;flex-direction:column;transition:.2s;}
.dcard:hover{transform:translateY(-4px);}
.d-harness{background:linear-gradient(150deg,var(--navy) 0%,var(--navy-deep) 100%);}
.d-harness::after{content:"";position:absolute;right:-60px;top:-60px;width:220px;height:220px;border-radius:50%;background:rgba(234,122,31,.16);}
.d-tpms{background:linear-gradient(150deg,var(--teal-d) 0%,var(--teal-ink) 100%);}
.d-tpms::after{content:"";position:absolute;right:-60px;top:-60px;width:220px;height:220px;border-radius:50%;background:rgba(255,255,255,.10);}
.dcard .tag{font-size:11px;font-weight:800;letter-spacing:2.5px;text-transform:uppercase;opacity:.9;margin-bottom:14px;}
.d-harness .tag{color:var(--orange-soft);} .d-tpms .tag{color:var(--teal-soft);}
.dcard h2{font-size:26px;margin-bottom:10px;color:#fff;}
.dcard p{font-size:15px;opacity:.9;max-width:440px;margin-bottom:20px;}
.dcard ul{margin-bottom:26px;position:relative;z-index:1;}
.dcard li{font-size:14.5px;padding:7px 0 7px 26px;position:relative;border-top:1px solid rgba(255,255,255,.14);}
.dcard li::before{content:"";position:absolute;left:2px;top:14px;width:8px;height:8px;border-radius:2px;}
.d-harness li::before{background:var(--orange);} .d-tpms li::before{background:var(--teal-soft);}
.dcard .btn{margin-top:auto;align-self:flex-start;position:relative;z-index:1;}

/* ---- 信任条 ---- */
.trust{background:var(--card);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.trust .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;padding-top:18px;padding-bottom:18px;}
.trust div{font-size:14px;font-weight:700;display:flex;align-items:center;gap:9px;color:var(--navy);}
.trust svg{color:var(--orange);flex:none;}

/* ---- 应用分类磁贴 ---- */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.cat-tile{background:var(--card);border:1px solid var(--line);border-radius:16px;overflow:hidden;
  transition:.2s;display:block;}
.cat-tile:hover{transform:translateY(-4px);box-shadow:var(--shadow);}
.cat-tile img{width:100%;height:200px;object-fit:cover;}
.cat-tile .cap{display:block;padding:18px 20px 20px;font-weight:800;font-size:16.5px;}
.cat-tile .cap small{display:block;font-weight:400;font-size:13.5px;color:var(--muted);margin-top:4px;line-height:1.5;}

/* ---- 卡片（图文） ---- */
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;overflow:hidden;transition:.2s;display:flex;flex-direction:column;}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);}
.card img{width:100%;height:190px;object-fit:cover;}
.card .body{padding:22px 24px 24px;}
.card .body h3{margin-bottom:8px;}
.card .body p{font-size:14.5px;color:var(--muted);}
.card .more{display:inline-block;margin-top:12px;font-weight:700;font-size:13.5px;color:var(--orange-d);}
.card:hover .more{color:var(--orange);}

/* ---- 产品线卡（TPMS 六线 / 列表卡） ---- */
.l-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.l-card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:28px 26px;
  transition:.2s;display:flex;flex-direction:column;}
.l-card:hover{box-shadow:var(--shadow);transform:translateY(-3px);}
.l-card .no{font-size:11.5px;font-weight:800;letter-spacing:2px;color:var(--teal);margin-bottom:10px;}
.l-card.no-h{color:var(--orange-d);}
.l-card h3{font-size:18.5px;margin-bottom:8px;}
.l-card p{font-size:14px;color:var(--muted);margin-bottom:12px;}
.l-card ul{margin-top:auto;}
.l-card li{font-size:13.5px;padding:5px 0 5px 22px;position:relative;}
.l-card li::before{content:"";position:absolute;left:2px;top:12px;width:7px;height:7px;border-radius:2px;background:var(--teal);}
.l-card.no-h li::before{background:var(--orange);}

/* ---- 深蓝数据带 ---- */
.strength{background:var(--navy-deep);color:#fff;}
.strength .kicker{color:var(--orange-soft);} .strength .kicker::before{background:var(--orange-soft);}
.strength h2{color:#fff;margin-bottom:10px;}
.strength .sec-head p{color:#b9c5d3;}
.s-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.s-card{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:14px;padding:26px 22px;}
.s-card .num{font-size:30px;font-weight:800;color:var(--orange-soft);margin-bottom:4px;}
.s-card:nth-child(even) .num{color:var(--teal-soft);}
.s-card b{display:block;font-size:15px;margin-bottom:4px;}
.s-card span{font-size:13px;color:#b9c5d3;}

/* ---- 买家类型 ---- */
.b-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.b-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:28px 24px;transition:.2s;}
.b-card:hover{border-color:var(--navy);}
.b-card .ic{width:44px;height:44px;border-radius:10px;display:flex;align-items:center;justify-content:center;
  margin-bottom:16px;font-size:13px;font-weight:800;color:#fff;background:var(--navy);}
.b-card:nth-child(even) .ic{background:var(--teal);}
.b-card b{display:block;font-size:16px;margin-bottom:6px;}
.b-card p{font-size:13.5px;color:var(--muted);}

/* ---- 流程步骤 ---- */
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:18px;counter-reset:step;}
.step{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:24px 20px;position:relative;}
.step::before{counter-increment:step;content:"0" counter(step);font-size:12px;font-weight:800;
  letter-spacing:1.5px;color:var(--orange);display:block;margin-bottom:10px;}
.step h4{font-size:15.5px;margin-bottom:6px;}
.step p{font-size:13.5px;color:var(--muted);}

/* ---- FAQ ---- */
.faq{max-width:820px;margin:0 auto;}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:0 22px;margin-bottom:12px;}
.faq summary{font-weight:700;font-size:15.5px;padding:16px 0;cursor:pointer;list-style:none;position:relative;padding-right:30px;}
.faq summary::-webkit-details-marker{display:none;}
.faq summary::after{content:"+";position:absolute;right:2px;top:14px;font-size:20px;color:var(--orange);font-weight:800;}
.faq details[open] summary::after{content:"–";}
.faq details p{padding:0 0 18px;font-size:14.5px;color:var(--muted);}

/* ---- 内页页头 ---- */
.page-head{padding:64px 0 48px;background:
  radial-gradient(560px 260px at 8% -20%, rgba(30,58,95,.12), transparent 60%),var(--bg);}
.page-head h1{font-size:36px;margin-bottom:12px;}
.page-head .sub{font-size:16.5px;max-width:760px;}
.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:22px;}
.breadcrumb a:hover{color:var(--orange-d);}
.breadcrumb span{margin:0 6px;color:#c1c9d2;}

/* ---- 产品详情页 ---- */
.detail-hero{display:grid;grid-template-columns:1.05fr 1fr;gap:36px;align-items:start;margin-bottom:36px;}
.detail-hero .main-img{border-radius:16px;border:1px solid var(--line);width:100%;height:380px;object-fit:cover;}
.check-list li{padding:7px 0 7px 30px;position:relative;font-size:15px;}
.check-list li::before{content:"";position:absolute;left:0;top:12px;width:18px;height:18px;
  background:var(--orange);border-radius:5px;
  -webkit-mask:center/contain no-repeat url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E");
          mask:center/contain no-repeat url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E");}
.check-list li::before{background:var(--teal-ink);}
.check-list li b{color:var(--ink);}
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;}
.gallery img{border-radius:12px;border:1px solid var(--line);height:150px;width:100%;object-fit:cover;cursor:pointer;transition:.15s;}
.gallery img:hover{border-color:var(--orange);}
.table-wrap{background:var(--card);border:1px solid var(--line);border-radius:14px;overflow:hidden;}
table.spec{width:100%;border-collapse:collapse;font-size:14.5px;}
table.spec tr{border-bottom:1px solid var(--line);}
table.spec tr:last-child{border:none;}
table.spec th{width:200px;text-align:left;padding:14px 20px;background:#f2f5f8;font-weight:700;color:var(--navy);vertical-align:top;}
table.spec td{padding:14px 20px;color:var(--ink);}
.fit-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px;}
.fit-box{background:var(--card);border:1px solid var(--line);border-left:5px solid var(--teal);border-radius:14px;padding:26px 28px;}
.fit-box.no{border-left-color:var(--orange);}
.fit-box h3{margin-bottom:12px;font-size:17px;}
.fit-box li{font-size:14.5px;color:var(--muted);padding:6px 0 6px 20px;position:relative;}
.fit-box li::before{content:"";position:absolute;left:0;top:13px;width:8px;height:8px;border-radius:2px;background:var(--teal);}
.fit-box.no li::before{background:var(--orange);}
.related{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}

/* ---- 案例卡 ---- */
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.case-card{background:var(--card);border:1px solid var(--line);border-radius:16px;overflow:hidden;display:flex;flex-direction:column;transition:.2s;}
.case-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);}
.case-card img{height:190px;width:100%;object-fit:cover;}
.case-card .body{padding:22px 24px 24px;display:flex;flex-direction:column;flex:1;}
.case-card .tag{font-size:11px;font-weight:800;letter-spacing:2px;text-transform:uppercase;color:var(--teal);margin-bottom:8px;}
.case-card .tag.o{color:var(--orange-d);}
.case-card h3{font-size:17.5px;margin-bottom:8px;}
.case-card p{font-size:14px;color:var(--muted);margin-bottom:14px;}
.case-card .result{margin-top:auto;border-top:1px solid var(--line);padding-top:12px;font-size:13.5px;font-weight:700;color:var(--navy);}

/* ---- OEM 定制页：双轨 ---- */
.route-grid{display:grid;grid-template-columns:1fr 1fr;gap:26px;}
.route-card{border-radius:18px;padding:36px 34px;color:#fff;display:flex;flex-direction:column;}
.route-h{background:linear-gradient(150deg,var(--navy) 0%,var(--navy-deep) 100%);}
.route-t{background:linear-gradient(150deg,var(--teal-d) 0%,var(--teal-ink) 100%);}
.route-card .tag{font-size:11px;font-weight:800;letter-spacing:2.5px;text-transform:uppercase;margin-bottom:12px;}
.route-h .tag{color:var(--orange-soft);} .route-t .tag{color:var(--teal-soft);}
.route-card h3{font-size:22px;color:#fff;margin-bottom:10px;}
.route-card p{font-size:14.5px;opacity:.9;margin-bottom:16px;}
.route-card li{font-size:14px;padding:6px 0 6px 24px;position:relative;border-top:1px solid rgba(255,255,255,.13);}
.route-card li::before{content:"";position:absolute;left:2px;top:13px;width:8px;height:8px;border-radius:2px;}
.route-h li::before{background:var(--orange);} .route-t li::before{background:var(--teal-soft);}
.param-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.param-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:24px 22px;}
.param-card h4{font-size:15.5px;margin-bottom:8px;color:var(--navy);}
.param-card p{font-size:13.5px;color:var(--muted);}

/* ---- 首页接线图模块 / 四列参数卡 ---- */
.diagram-grid{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center;}
.param-grid-4{grid-template-columns:repeat(4,1fr);}

/* ---- 询盘表单 ---- */
.form-layout{display:grid;grid-template-columns:1.6fr 1fr;gap:36px;align-items:start;}
.form-card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:38px 40px;}
.f-section{margin-bottom:30px;}
.f-section>h3{font-size:16px;letter-spacing:.5px;text-transform:uppercase;color:var(--navy);
  padding-bottom:10px;border-bottom:2px solid var(--line);margin-bottom:20px;font-weight:800;}
.f-section>h3 small{float:right;font-weight:400;text-transform:none;letter-spacing:0;color:var(--muted);font-size:12.5px;}
.f-row{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-bottom:18px;}
.field label{display:block;font-size:13.5px;font-weight:700;margin-bottom:7px;}
.field label i{color:var(--orange-d);font-style:normal;}
.field input,.field select,.field textarea{width:100%;padding:12px 14px;border:1.5px solid var(--line);
  border-radius:10px;font-family:inherit;font-size:14.5px;color:var(--ink);background:#fff;transition:.15s;}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--navy);box-shadow:0 0 0 3px rgba(30,58,95,.10);}
.field textarea{min-height:120px;resize:vertical;}
.field .hint{font-size:12px;color:var(--muted);margin-top:5px;}
.check-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px 18px;}
.check{display:flex;align-items:flex-start;gap:9px;font-size:14px;cursor:pointer;}
.check input{width:17px;height:17px;margin-top:3px;accent-color:var(--orange);flex:none;}
.file-drop{border:2px dashed #c6cfd9;border-radius:12px;padding:26px;text-align:center;color:var(--muted);
  font-size:14px;background:#fafbfc;cursor:pointer;transition:.15s;}
.file-drop:hover{border-color:var(--orange);color:var(--ink);}
.file-drop b{display:block;font-size:15px;margin-bottom:4px;color:var(--ink);}
.consent{display:block;position:relative;padding-left:26px;font-size:13px;color:var(--muted);margin:6px 0 22px;line-height:1.6;}
.consent input{position:absolute;left:0;top:2px;width:17px;height:17px;accent-color:var(--orange);}
.consent a{color:var(--navy);font-weight:700;text-decoration:underline;}
.form-ok{display:none;background:#effbf3;border:1px solid #bfe5c9;border-radius:12px;padding:18px 22px;
  color:#1d5c33;font-size:14.5px;margin-bottom:20px;}
.aside-rail .rail-card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:26px 26px;margin-bottom:20px;}
.aside-rail h3{font-size:16px;margin-bottom:14px;}
.aside-rail ol{padding-left:20px;font-size:14px;color:var(--muted);}
.aside-rail ol li{margin-bottom:10px;}
.aside-rail ol b{color:var(--ink);}
.rail-contact{font-size:14px;}
.rail-contact li{padding:8px 0;border-bottom:1px solid var(--line);display:flex;gap:10px;align-items:center;}
.rail-contact li:last-child{border:none;}
.rail-contact svg{flex:none;color:var(--orange);}
.rail-contact a{font-weight:700;color:var(--navy);}
.rail-contact a:hover{color:var(--orange-d);}

/* ---- CTA ---- */
.cta-band{background:var(--navy-deep);color:#fff;text-align:center;padding:64px 0;}
.cta-band h2{font-size:28px;margin-bottom:10px;color:#fff;}
.cta-band p{color:#b9c5d3;margin-bottom:26px;}
.cta-band .btn{background:var(--orange);color:#fff;}
.cta-band .btn:hover{background:var(--orange-d);}
.cta-box{background:linear-gradient(120deg,var(--navy-deep) 0%,var(--teal-d) 100%);border-radius:22px;
  padding:60px 56px;text-align:center;color:#fff;}
.cta-box h2{font-size:29px;margin-bottom:12px;color:#fff;}
.cta-box p{color:#cfdbe6;max-width:640px;margin:0 auto 28px;}
.cta-box .btn{background:#fff;color:var(--navy-deep);}
.cta-box .btn:hover{background:#e8edf2;}

/* ---- About 页 ---- */
.photo-wall{display:grid;grid-template-columns:2fr 1fr 1fr;gap:16px;}
.photo-wall img{border-radius:14px;height:230px;width:100%;object-fit:cover;border:1px solid var(--line);}
.facts{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;}
.fact{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px 24px;}
.fact b{display:block;font-size:15px;color:var(--navy);margin-bottom:4px;}
.fact span{font-size:14px;color:var(--muted);}

/* ---- 页脚 ---- */
footer{background:#0d1b2e;color:#8fa0b3;padding:52px 0 36px;font-size:14px;}
.f-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px;margin-bottom:36px;}
.f-grid b{display:block;color:#fff;font-size:13px;letter-spacing:1.5px;text-transform:uppercase;margin-bottom:14px;}
.f-grid a,.f-grid li{display:block;padding:4px 0;color:#8fa0b3;}
.f-grid a:hover{color:#fff;}
.f-bottom{border-top:1px solid rgba(255,255,255,.10);padding-top:20px;font-size:12.5px;color:#66788c;
  display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;}
.f-wa{display:inline-flex;align-items:center;gap:8px;background:#1fa855;color:#fff;font-weight:700;
  border-radius:999px;padding:8px 18px;margin-top:12px;font-size:13.5px;}
.f-wa:hover{background:#189547;color:#fff;}

/* ---- 响应式 ---- */
@media(max-width:980px){
  .grid-3,.l-grid,.case-grid,.related,.param-grid{grid-template-columns:1fr 1fr;}
  .s-grid,.b-grid,.trust .wrap{grid-template-columns:1fr 1fr;}
  .steps{grid-template-columns:1fr 1fr;}
  .detail-hero,.form-layout,.route-grid,.fit-grid{grid-template-columns:1fr;}
  .photo-wall{grid-template-columns:1fr 1fr;}
  .photo-wall img:first-child{grid-column:1/-1;}
  .diagram-grid{grid-template-columns:1fr;gap:28px;}
  .param-grid-4{grid-template-columns:1fr 1fr;}
}
@media(max-width:820px){
  .nav-links{display:none;position:absolute;top:72px;left:0;right:0;background:#fff;
    flex-direction:column;padding:20px 24px;gap:16px;border-bottom:1px solid var(--line);box-shadow:var(--shadow);}
  .nav-links.open{display:flex;}
  .nav-toggle{display:block;}
  .split{grid-template-columns:1fr;}
  .f-row,.check-grid{grid-template-columns:1fr;}
  .hero-head h1,.page-head h1{font-size:29px;}
  h2{font-size:25px;}
  section{padding:56px 0;}
  .form-card{padding:26px 22px;}
  .f-grid{grid-template-columns:1fr 1fr;}
  .topbar .tb-left{display:none;}
}
@media(max-width:560px){
  .grid-3,.l-grid,.case-grid,.related,.param-grid,.steps,.s-grid,.b-grid,.photo-wall{grid-template-columns:1fr;}
  .param-grid-4{grid-template-columns:1fr;}
  .f-grid{grid-template-columns:1fr;}
  .trust .wrap{grid-template-columns:1fr;}
}

/* ===== 中英对照版（Bilingual 对照版） ===== */
.zh{display:block;color:var(--muted);font-weight:400;font-size:.9em;line-height:1.6;margin-top:5px;}
h1 .zh,h2 .zh,h3 .zh,h4 .zh{margin-top:7px;color:#33425a;font-weight:600;}
p .zh,p.sub .zh{margin-top:6px;}
li .zh,.check li .zh{margin-top:3px;font-size:.92em;}
.note .zh,.note-teal .zh{display:block;margin-top:6px;font-size:.92em;}
.dcard .zh,.route-card .zh{color:rgba(255,255,255,.88);}
.btn .zh{display:inline;margin-left:6px;font-weight:600;}
.tag .zh{display:inline;margin-left:5px;opacity:.85;}
/* 导航与页脚的中文以细小副标呈现，不打乱版式 */
.nav-links .zh{display:block;font-size:10px;color:#9aa7b5;margin-top:1px;letter-spacing:0;font-weight:600;}
.dropdown .zh{display:block;font-size:10.5px;color:#8c99a8;margin-top:1px;}
.breadcrumb .zh,.kicker .zh{display:inline;font-size:.82em;color:#8c99a8;margin-left:5px;font-weight:700;letter-spacing:0;}
.f-grid .zh{display:block;font-size:11px;color:#7e8fa1;margin-top:1px;}
.f-bottom .zh{display:inline;}
.dd-all .zh{display:inline;margin-left:4px;font-size:.9em;}
.logo .zh{display:block;}
.draftbar .zh{color:#cbd5e1;font-weight:600;}
.cta-cn{display:block;color:#cfdbe6;font-weight:600;margin-top:6px;}

/* 页脚 WhatsApp 按钮：覆盖 .f-grid a 的 block 拉伸 */
.f-grid a.f-wa{display:inline-flex;width:auto;padding:8px 18px;margin-top:12px;}

/* 多文件上传列表 */
.file-list{margin-top:10px;font-size:13px;}
.file-item{display:flex;justify-content:space-between;align-items:center;gap:10px;background:#f2f5f8;border:1px solid var(--line);border-radius:8px;padding:6px 10px;margin-top:6px;color:var(--ink);}
.file-item button{background:none;border:none;font-size:16px;line-height:1;color:var(--muted);cursor:pointer;padding:0 4px;}
.file-item button:hover{color:var(--carmine,#b3261e);}
.file-drop.drag{border-color:var(--orange);background:#fff7ef;}