/* ============================================================
 * VALTIAN 首页样式 - 基于设计稿 valtian-homepage-design.html
 * ============================================================ */
:root{
  --navy:#014e50; --navy2:#015a5c; --blue:#017173; --blue-l:#03999c;
  --red:#017173; --ink:#162635; --muted:#66788a; --line:#dce5ec;
  --soft:#edf5fa; --white:#fff; --max:1220px; --shadow:0 14px 40px rgba(10,37,62,.12);
  --radius:12px; --radius-lg:16px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;color:var(--ink);font:16px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif}
a{text-decoration:none;color:inherit}
img{display:block;max-width:100%;height:auto}
.wrap{width:min(1220px,calc(100% - 48px));margin:auto}
.kicker{display:inline-flex;align-items:center;gap:10px;color:#017173;font-weight:800;font-size:12px;letter-spacing:.18em;text-transform:uppercase}
.kicker::before{content:"";width:26px;height:2px;background:#017173}
.section-kicker{color:#017173;letter-spacing:.11em;font-weight:800;font-size:13px;text-transform:uppercase}
.h2{font-size:clamp(28px,3.2vw,42px);letter-spacing:-.03em;line-height:1.2;margin:0 0 14px}
.lead{color:#66788a;max-width:60ch}

/* ============================================================
 * Hero 区块 - 工程蓝图
 * ============================================================ */
.hero{
  background:
    radial-gradient(1100px 500px at 85% -10%, rgba(18,114,196,.35), transparent 60%),
    linear-gradient(160deg,#0a2740 0%, #014e50 55%, #071a2c 100%);
  color:#e8f1f8;overflow:hidden;position:relative;isolation:isolate;
}
.hero::before{
  content:"";position:absolute;inset:0;z-index:-1;
  background-image:
    linear-gradient(rgba(140,180,210,.07) 1px,transparent 1px),
    linear-gradient(90deg,rgba(140,180,210,.07) 1px,transparent 1px);
  background-size:44px 44px;
  mask-image:radial-gradient(800px 500px at 70% 30%,#000,transparent 75%);
  -webkit-mask-image:radial-gradient(800px 500px at 70% 30%,#000,transparent 75%);
}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;padding:90px 0 96px;position:relative;z-index:1}
.hero-kicker{color:#ff8d80}
.hero h1{font-size:clamp(36px,4.6vw,58px);line-height:1.12;letter-spacing:-.03em;margin:16px 0 20px;color:#fff}
.hero h1 em{font-style:normal;color:#7fc0ff}
.hero .lead{color:#a9c4da;font-size:17px;max-width:520px;line-height:1.8;margin:0 0 24px}
.chips{display:flex;flex-wrap:wrap;gap:10px;margin:28px 0 32px}
.chip{border:1px solid rgba(150,190,220,.3);background:rgba(255,255,255,.05);padding:7px 14px;border-radius:4px;font-size:13px;color:#cfe2f0}
.chip b{color:#fff;font-weight:700}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin:0 0 22px}
.btn{display:inline-flex;align-items:center;gap:10px;padding:12px 22px;border-radius:10px;font-weight:700;font-size:15px;transition:.2s;border:1px solid transparent;cursor:pointer}
.btn-primary{background:#017173;color:#fff;box-shadow:0 8px 22px rgba(231,67,54,.32)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(231,67,54,.4)}
.btn-outline{border:1px solid rgba(160,200,230,.45);color:#e8f1f8;background:transparent}
.btn-outline:hover{border-color:#7fc0ff;color:#7fc0ff}
.hero-note{font-size:13px;color:#7f9db5;line-height:1.6}

/* 工程蓝图 SVG 区域 */
.blueprint{position:relative;filter:drop-shadow(0 30px 60px rgba(0,0,0,.35))}
.blueprint svg{display:block;max-width:100%;height:auto}
.blueprint .float-card{
  position:absolute;background:rgba(10,36,58,.82);backdrop-filter:blur(8px);
  border:1px solid rgba(140,185,220,.28);border-radius:14px;padding:12px 16px;
  box-shadow:0 14px 34px rgba(0,0,0,.35);color:#fff;z-index:2;
}
.blueprint .float-card b{display:block;color:#fff;font-size:19px;font-weight:700}
.blueprint .float-card span{display:block;font-size:12px;color:#9dbcd4;margin-top:2px}
.fc1{top:6%;left:-4%;animation:float 6s ease-in-out infinite}
.fc2{bottom:10%;right:-2%;animation:float 7s ease-in-out infinite reverse}
@keyframes float{50%{transform:translateY(-10px)}}

/* ============================================================
 * 统计条
 * ============================================================ */
.stats{background:#fff;border-bottom:1px solid #dce5ec;padding:28px 0}
.stats .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stat b{font-size:clamp(28px,3vw,38px);color:#014e50;letter-spacing:-.02em;font-weight:800;display:block;line-height:1.2}
.stat b i{font-style:normal;color:#017173;font-size:.55em;vertical-align:.35em;margin-left:2px}
.stat span{display:block;color:#66788a;font-size:13.5px;margin-top:6px;line-height:1.4}

/* ============================================================
 * 通用区块样式
 * ============================================================ */
.section{padding:92px 0}
.section.soft{background:linear-gradient(180deg,#fff, #edf5fa)}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:44px;flex-wrap:wrap}
.section-head > div > p{margin:10px 0 0;color:#66788a;max-width:55ch}
.link-more{color:#017173;font-weight:700;font-size:14.5px;white-space:nowrap;transition:.2s}
.link-more:hover{color:#017173}

/* ============================================================
 * 产品分类网格 - 七大方向
 * ============================================================ */
.products-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:18px}
.prod-card{
  position:relative;border:1px solid #dce5ec;border-radius:16px;
  padding:26px 24px 22px;background:#fff;transition:.25s;overflow:hidden;
  text-decoration:none;color:inherit;display:block;
}
.prod-card::after{content:"";position:absolute;inset:auto 0 0 0;height:3px;background:linear-gradient(90deg,#017173,transparent);opacity:0;transition:.25s}
.prod-card:hover{transform:translateY(-6px);box-shadow:0 14px 40px rgba(10,37,62,.12);border-color:#c3d6e5}
.prod-card:hover::after{opacity:1}
.prod-card .num{position:absolute;top:18px;right:20px;font-size:13px;font-weight:800;color:#c9d8e4;letter-spacing:.04em}
.prod-card svg{width:46px;height:46px;stroke:#017173;fill:none;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;transition:.25s}
.prod-card:hover svg{stroke:#017173}
.prod-card h3{margin:14px 0 6px;font-size:18.5px;letter-spacing:-.01em}
.prod-card p{color:#66788a;font-size:14px;line-height:1.65;margin:0}

/* ============================================================
 * 精选产品样板 - Q641F
 * ============================================================ */
.featured{display:grid;grid-template-columns:.92fr 1.08fr;gap:52px;align-items:center}
.featured-art{background:radial-gradient(400px 260px at 30% 20%,#123a5c,#014e50);
  border-radius:20px;aspect-ratio:4/3.1;display:grid;place-items:center;position:relative;overflow:hidden}
.featured-art svg{width:78%;max-width:280px}
.spec-table{width:100%;border-collapse:collapse;margin-top:8px;font-size:15px}
.spec-table td{padding:12px 4px;border-bottom:1px dashed #dce5ec;font-size:15px}
.spec-table td:first-child{color:#66788a;width:38%}
.spec-table td:last-child{font-weight:700;color:#182635}
.badge-new{display:inline-block;background:#eaf4fd;color:#017173;font-size:12px;font-weight:800;padding:4px 12px;border-radius:4px;letter-spacing:.06em;text-transform:uppercase}

/* ============================================================
 * 行业应用入口
 * ============================================================ */
.apps-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px}
.app-card{
  border-radius:16px;padding:30px 26px;color:#dfeefb;position:relative;overflow:hidden;
  min-height:190px;display:flex;flex-direction:column;justify-content:flex-end;
  background:linear-gradient(145deg,#10314f,#014e50);text-decoration:none;color:inherit;
}
.app-card:nth-child(2){background:linear-gradient(145deg,#0d3a63,#0a2740)}
.app-card:nth-child(3){background:linear-gradient(145deg,#143c56,#0b2236)}
.app-card:nth-child(4){background:linear-gradient(145deg,#0f3050,#081d31)}
.app-card em{position:absolute;top:-14px;right:6px;font-style:normal;font-size:74px;font-weight:900;color:rgba(130,175,210,.14);line-height:1}
.app-card h3{color:#fff;font-size:19px;margin-bottom:6px}
.app-card p{font-size:13.5px;color:#a8c3d9;line-height:1.6;margin:0}
.app-card .go{margin-top:10px;font-size:13px;color:#7fc0ff;font-weight:700;display:inline-flex;gap:6px;align-items:center}
.app-card .go::after{content:"→";transition:transform .2s}
.app-card:hover .go{transform:translateX(4px)}

/* ============================================================
 * 四步选型流程
 * ============================================================ */
.process-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));border:1px solid #dce5ec;border-radius:16px;overflow:hidden;background:#fff}
.step{padding:34px 28px;border-right:1px solid #dce5ec;position:relative;counter-increment:step}
.step:last-child{border-right:0}
.step::before{counter-increment:step;content:"0" counter(step);font-size:15px;font-weight:900;color:#017173;letter-spacing:.1em;display:block;margin-bottom:10px}
.step h4{margin:10px 0 8px;font-size:17.5px}
.step p{font-size:13.8px;color:#66788a;margin:0}

/* ============================================================
 * FAQ 区块
 * ============================================================ */
.faq-list{max-width:860px;margin:0 auto}
.faq-list details{border-bottom:1px solid #dce5ec;padding:4px 0}
.faq-list summary{cursor:pointer;list-style:none;display:flex;gap:14px;align-items:center;padding:16px 4px;font-weight:700;font-size:16.5px;user-select:none}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary .pm{flex:none;width:28px;height:28px;border-radius:50%;background:#edf5fa;color:#017173;display:grid;place-items:center;font-weight:900;font-size:16px;transition:.25s}
details[open] summary .pm{background:#017173;color:#fff;transform:rotate(45deg)}
.faq-list .answer{padding:2px 46px 20px;color:#53687a;font-size:15px;line-height:1.85}

/* ============================================================
 * 知识入口 / 资料入口
 * ============================================================ */
.knowledge-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:18px}
.knowledge-card{
  border:1px solid #dce5ec;border-radius:16px;overflow:hidden;background:#fff;transition:.25s;
  display:flex;flex-direction:column;text-decoration:none;color:inherit;
}
.knowledge-card:hover{transform:translateY(-5px);box-shadow:0 14px 40px rgba(10,37,62,.12)}
.knowledge-card .k-img{aspect-ratio:16/8.5;background:linear-gradient(135deg,#123a5c,#0a2740);display:grid;place-items:center;color:#5f93ba}
.knowledge-card .kimg svg{width:64px;height:64px;stroke:currentColor;fill:none;stroke-width:1.4}
.knowledge-card .kbody{padding:20px 22px 22px}
.knowledge-card time{color:#017173;font-weight:800;font-size:12.5px;letter-spacing:.06em;display:block;margin-bottom:8px}
.knowledge-card h4{font-size:17px;margin:8px 0 8px;line-height:1.5}
.knowledge-card p{color:#66788a;font-size:13.5px;line-height:1.6;margin:0}

/* ============================================================
 * CTA 区块
 * ============================================================ */
.cta{
  background:linear-gradient(135deg,#015a5c,#016e70 60%,#017173);
  border-radius:22px;color:#fff;padding:56px 54px;
  display:flex;align-items:center;justify-content:space-between;gap:30px;
  flex-wrap:wrap;position:relative;overflow:hidden
}
.cta::after{content:"";position:absolute;right:-60px;top:-60px;width:280px;height:280px;border-radius:50%;border:38px solid rgba(255,255,255,.06)}
.cta h2{font-size:clamp(26px,2.8vw,36px);letter-spacing:-.02em;margin:0 0 8px}
.cta p{color:#bcd8ec;margin:0 0 14px;font-size:15px}
.cta .btn{padding:14px 30px;font-size:16px}
.cta .btn-white{background:#fff;color:#015a5c;padding:14px 30px;font-size:16px}
.cta .btn-white:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(0,0,0,.15)}

/* ============================================================
 * 页脚
 * ============================================================ */
.site-footer{background:#014e50;color:#8fa9be;padding:60px 0 26px;font-size:14px}
.foot-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1.1fr;gap:34px;padding-bottom:36px;border-bottom:1px solid rgba(140,170,195,.18)}
.foot-grid h5{color:#fff;font-size:15px;margin-bottom:14px;letter-spacing:.02em}
.foot-grid a{display:block;padding:3.5px 0;transition:.2s;font-size:13.5px;color:inherit}
.foot-grid a:hover{color:#fff}
.foot-grid .qr{width:96px;height:96px;border:1px dashed rgba(150,185,215,.4);border-radius:10px;display:grid;place-items:center;color:#6d89a1;font-size:11.5px;text-align:center;line-height:1.5}
.copyright{text-align:center;padding-top:22px;font-size:12.5px;color:#5f7a91}

/* ============================================================
 * 响应式
 * ============================================================ */
@media(max-width:960px){
  .hero-grid,.featured{grid-template-columns:1fr;gap:36px}
  .hero-grid{padding:64px 0 72px}
  .hero{padding:0}
  .stats .wrap{grid-template-columns:repeat(2,1fr)}
  .mfg{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .hero-grid{padding:56px 0 64px}
  .blueprint{order:-1;margin-top:-40px}
}
@media(max-width:600px){
  .wrap{width:calc(100% - 32px)}
  .hero h1{font-size:36px}
  .hero-actions{flex-direction:column}
  .hero-actions .btn{width:100%;justify-content:center}
  .stats .wrap{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr}
  .hero-grid{padding:44px 0 56px}
  .hero h1{font-size:34px}
  .section{padding:64px 0}
  .section-head{margin-bottom:32px}
  .hero .lead{font-size:16px}
  .chips{gap:8px}
  .chip{font-size:12px;padding:6px 12px}
  .hero-actions{gap:10px}
}

/* ============================================================
 * 通用工具类
 * ============================================================ */
.rv{opacity:0;transform:translateY(24px);transition:opacity .6s ease, transform .6s ease}
.rv.on{opacity:1;transform:none}
.kicker{display:inline-flex;align-items:center;gap:10px;color:#017173;font-weight:800;font-size:12px;letter-spacing:.18em;text-transform:uppercase}
.kicker::before{content:"";width:26px;height:2px;background:#017173}
.section-kicker{color:#017173;letter-spacing:.11em;font-weight:800;font-size:13px;text-transform:uppercase;display:block;margin-bottom:8px}
.h2{font-size:clamp(28px,3.2vw,42px);letter-spacing:-.03em;line-height:1.2;margin:0 0 14px}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:44px;flex-wrap:wrap}
.section-head > div > p{margin:10px 0 0;color:#66788a;max-width:55ch}
.link-more{color:#017173;font-weight:700;font-size:14.5px;white-space:nowrap;transition:.2s}
.link-more:hover{color:#017173}
.btn{display:inline-flex;align-items:center;gap:10px;padding:12px 22px;border-radius:10px;font-weight:700;font-size:15px;transition:.2s;border:1px solid transparent;cursor:pointer}
.btn-primary{background:#017173;color:#fff;box-shadow:0 8px 22px rgba(231,67,54,.32)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(231,67,54,.4)}
.btn-outline{border:1px solid rgba(160,200,230,.45);color:#e8f1f8;background:transparent}
.btn-white{background:#fff;color:#015a5c;padding:14px 30px;font-size:16px;font-weight:700}
.btn-white:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(0,0,0,.15)}

/* 首页真实产品图展示：覆盖早期 SVG 图标样式 */
.products-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.prod-card{padding:12px 12px 18px;border-radius:12px;background:#fff}
.prod-card .num{z-index:2;left:22px;right:auto;top:20px;width:30px;height:30px;border-radius:50%;background:rgba(255,255,255,.92);display:grid;place-items:center;color:#017173;font-size:11px;box-shadow:0 2px 10px rgba(10,37,62,.08)}
.prod-photo{height:190px;margin:0 0 17px;border-radius:8px;background:linear-gradient(135deg,#f3f6f8,#e6edf1);display:grid;place-items:center;overflow:hidden}
.prod-photo img{width:100%;height:100%;object-fit:contain;mix-blend-mode:multiply;transition:transform .4s ease}
.prod-card:hover .prod-photo img{transform:scale(1.055)}
.prod-card h3{padding:0 8px;margin:0 0 7px;font-size:20px}
.prod-card p{padding:0 8px;min-height:44px;font-size:13px;line-height:1.6}
.prod-more{display:flex;align-items:center;justify-content:space-between;padding:13px 8px 0;margin:14px 8px 0;border-top:1px solid #e8eef2;color:#017173;font-size:13px;font-weight:800}
.prod-card:hover .prod-more{color:#017173}

/* Q641F 样板：真实图与参数并列，避免插画占位和大面积留白 */
.feature-art{position:relative;min-height:510px;padding:40px;border-radius:18px;background:radial-gradient(circle at 50% 18%,#fff 0,#eff4f6 48%,#dfe8ec 100%);border:1px solid #d8e3e8;display:grid;place-items:center;overflow:hidden}
.feature-art::after{content:"";position:absolute;left:12%;right:12%;bottom:44px;height:15px;border-radius:50%;background:rgba(15,38,54,.2);filter:blur(9px)}
.feature-art img{position:relative;z-index:1;max-width:92%;max-height:405px;width:auto;height:auto;object-fit:contain;mix-blend-mode:multiply}
.feature-label{position:absolute;z-index:2;left:24px;top:22px;color:#017173;font-size:11px;font-weight:800;letter-spacing:.12em}
.featured .spec-table{max-height:405px;overflow:auto}
.featured .spec-table td{padding:9px 4px;font-size:14px}

@media(max-width:1080px){.products-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:720px){.products-grid{grid-template-columns:1fr}.prod-photo{height:230px}.feature-art{min-height:360px;padding:28px}.feature-art img{max-height:280px}}

/* 首页栏目封面：统一使用方图，不裁切真实阀门主体 */
.vlt-home .prod-photo{
  height:auto;
  aspect-ratio:1 / 1;
  margin:0 0 17px;
  padding:10px;
  background:#fff;
  border:1px solid #e4ecef;
}
.vlt-home .prod-photo img{
  width:100%;
  height:100%;
  object-fit:contain;
  mix-blend-mode:normal;
}
@media(max-width:720px){
  .vlt-home .prod-photo{aspect-ratio:1 / 1;height:auto;}
}

/* 首页最终布局校正：仅作用于首页，避免影响产品列表与详情页 */
.vlt-home .products-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}
.vlt-home .prod-card{padding:10px 10px 18px;border-radius:14px;border-color:#d8e2e8;box-shadow:0 7px 20px rgba(10,37,62,.035)}
.vlt-home .prod-photo{height:214px;margin:0 0 16px;border:1px solid #edf1f3;border-radius:9px;background:#fff}
.vlt-home .prod-photo img{width:100%;height:100%;object-fit:contain;mix-blend-mode:normal;padding:8px;transition:transform .35s ease}
.vlt-home .prod-card:hover{transform:translateY(-4px);box-shadow:0 16px 30px rgba(10,37,62,.11)}
.vlt-home .prod-card h3{padding:0 8px;margin:0 0 6px;font-size:20px}
.vlt-home .prod-card p{padding:0 8px;min-height:43px;margin:0;font-size:13px}
.vlt-home .prod-more{margin:14px 8px 0;padding:13px 0 0}
.vlt-home .apps-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}
.vlt-home .acard{min-height:205px;padding:27px 24px;border-radius:14px;color:#dcecf7;background:linear-gradient(145deg,#103654,#014e50);position:relative;overflow:hidden;display:flex;flex-direction:column;justify-content:flex-end;transition:transform .25s,box-shadow .25s}
.vlt-home .acard:nth-child(2){background:linear-gradient(145deg,#0f416d,#0a2740)}
.vlt-home .acard:nth-child(3){background:linear-gradient(145deg,#17475e,#0b283e)}
.vlt-home .acard:nth-child(4){background:linear-gradient(145deg,#123451,#071d30)}
.vlt-home .acard::after{content:"";position:absolute;width:150px;height:150px;border:1px solid rgba(153,201,235,.15);border-radius:50%;right:-64px;top:-58px}
.vlt-home .acard:hover{transform:translateY(-4px);box-shadow:0 16px 30px rgba(10,37,62,.18)}
.vlt-home .acard em{position:absolute;top:20px;right:22px;font-style:normal;font-weight:800;color:rgba(185,220,244,.38);font-size:34px}
.vlt-home .acard h3{color:#fff;margin:0 0 8px;font-size:19px;position:relative;z-index:1}
.vlt-home .acard p{margin:0;color:#b7d0e2;font-size:13px;line-height:1.7;position:relative;z-index:1}
.vlt-home .acard .go{display:flex;justify-content:space-between;align-items:center;margin-top:15px;padding-top:14px;border-top:1px solid rgba(203,229,245,.18);font-size:13px;color:#fff;font-weight:700;position:relative;z-index:1}
.vlt-home .proc-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0;border:1px solid #d9e4eb;border-radius:14px;overflow:hidden;background:#fff}
.vlt-home .proc-grid .step{min-height:202px;padding:30px 26px 28px;border-right:1px solid #d9e4eb;position:relative;counter-increment:none}
.vlt-home .proc-grid .step:last-child{border-right:0}
.vlt-home .proc-grid .step::before{counter-increment:none;content:"0" counter(section);display:block;color:#017173;font-size:12px;font-weight:900;letter-spacing:.12em;margin-bottom:18px}
.vlt-home .proc-grid .step:nth-child(1)::before{content:"01"}
.vlt-home .proc-grid .step:nth-child(2)::before{content:"02"}
.vlt-home .proc-grid .step:nth-child(3)::before{content:"03"}
.vlt-home .proc-grid .step:nth-child(4)::before{content:"04"}
.vlt-home .proc-grid .step h4{font-size:18px;line-height:1.4;margin:0 0 10px;color:#015a5c}
.vlt-home .proc-grid .step p{margin:0;font-size:13px;line-height:1.75;color:#66788a}
@media(max-width:1080px){.vlt-home .products-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.vlt-home .apps-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.vlt-home .proc-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.vlt-home .proc-grid .step:nth-child(2){border-right:0}.vlt-home .proc-grid .step:nth-child(-n+2){border-bottom:1px solid #d9e4eb}}
@media(max-width:720px){.vlt-home .products-grid,.vlt-home .apps-grid,.vlt-home .proc-grid{grid-template-columns:1fr}.vlt-home .prod-photo{height:250px}.vlt-home .proc-grid .step{min-height:auto;border-right:0;border-bottom:1px solid #d9e4eb}.vlt-home .proc-grid .step:last-child{border-bottom:0}.vlt-home .proc-grid .step:nth-child(-n+2){border-bottom:1px solid #d9e4eb}}

/* 产品卡片 - 七大方向 */
.products-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:18px}
.prod-card{position:relative;border:1px solid #dce5ec;border-radius:16px;padding:26px 24px 22px;background:#fff;transition:.25s;overflow:hidden;text-decoration:none;color:inherit;display:block}
.prod-card::after{content:"";position:absolute;inset:auto 0 0 0;height:3px;background:linear-gradient(90deg,#017173,transparent);opacity:0;transition:.25s}
.prod-card:hover{transform:translateY(-6px);box-shadow:0 14px 40px rgba(10,37,62,.12);border-color:#c3d6e5}
.prod-card:hover::after{opacity:1}
.prod-card .num{position:absolute;top:18px;right:20px;font-size:13px;font-weight:800;color:#c9d8e4;letter-spacing:.04em}
.prod-card svg{width:46px;height:46px;stroke:#017173;fill:none;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;transition:.25s}
.prod-card:hover svg{stroke:#017173}
.prod-card h3{margin:14px 0 6px;font-size:18.5px;letter-spacing:-.01em}
.prod-card p{color:#66788a;font-size:14px;line-height:1.65;margin:0}

/* FAQ */
.faq-list{max-width:860px;margin:0 auto}
.faq-list details{border-bottom:1px solid #dce5ec;padding:4px 0}
.faq-list summary{cursor:pointer;list-style:none;display:flex;gap:14px;align-items:center;padding:16px 4px;font-weight:700;font-size:16.5px;user-select:none}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary .pm{flex:none;width:28px;height:28px;border-radius:50%;background:#edf5fa;color:#017173;display:grid;place-items:center;font-weight:900;font-size:16px;transition:.25s}
details[open] summary .pm{background:#017173;color:#fff;transform:rotate(45deg)}
.faq-list .answer{padding:2px 46px 20px;color:#53687a;font-size:15px;line-height:1.85}

/* 知识入口卡片 */
.knowledge-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:18px}
.knowledge-card{border:1px solid #dce5ec;border-radius:16px;overflow:hidden;background:#fff;transition:.25s;text-decoration:none;color:inherit;display:flex;flex-direction:column}
.knowledge-card:hover{transform:translateY(-5px);box-shadow:0 14px 40px rgba(10,37,62,.12)}
.knowledge-card .k-img{aspect-ratio:16/8.5;background:linear-gradient(135deg,#123a5c,#0a2740);display:grid;place-items:center;color:#5f93ba}
.knowledge-card .kimg svg{width:64px;height:64px;stroke:currentColor;fill:none;stroke-width:1.4}
.knowledge-card .kbody{padding:20px 22px 22px}
.knowledge-card time{color:#017173;font-weight:800;font-size:12.5px;letter-spacing:.06em;display:block;margin-bottom:8px}
.knowledge-card h4{font-size:17px;margin:8px 0 8px;line-height:1.5}
.knowledge-card p{color:#66788a;font-size:13.5px;line-height:1.6;margin:0}

/* CTA */
.cta{background:linear-gradient(135deg,#015a5c,#016e70 60%,#017173);border-radius:22px;color:#fff;padding:56px 54px;display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap;position:relative;overflow:hidden}
.cta::after{content:"";position:absolute;right:-60px;top:-60px;width:280px;height:280px;border-radius:50%;border:38px solid rgba(255,255,255,.06)}
.cta h2{font-size:clamp(26px,2.8vw,36px);letter-spacing:-.02em;margin:0 0 8px}
.cta p{color:#bcd8ec;margin:0 0 14px;font-size:15px}
.cta .btn{padding:14px 30px;font-size:16px}
.cta .btn-white{background:#fff;color:#015a5c;padding:14px 30px;font-size:16px;font-weight:700}
.cta .btn-white:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(0,0,0,.15)}
.btn{display:inline-flex;align-items:center;gap:10px;padding:12px 22px;border-radius:10px;font-weight:700;font-size:15px;transition:.2s;border:1px solid transparent;cursor:pointer}
.btn-primary{background:#017173;color:#fff;box-shadow:0 8px 22px rgba(231,67,54,.32)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(231,67,54,.4)}
.btn-outline{border:1px solid rgba(160,200,230,.45);color:#e8f1f8;background:transparent}
.btn-white{background:#fff;color:#015a5c;padding:14px 30px;font-size:16px;font-weight:700}
.btn-white:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(0,0,0,.15)}
.cta .btn-white{background:#fff;color:#015a5c;padding:14px 30px;font-size:16px;font-weight:700}

/* Footer */
.site-footer{background:#014e50;color:#8fa9be;padding:60px 0 26px;font-size:14px}
.foot-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1.1fr;gap:34px;padding-bottom:36px;border-bottom:1px solid rgba(140,170,195,.18)}
.foot-grid h5{color:#fff;font-size:15px;margin-bottom:14px;letter-spacing:.02em}
.foot-grid a{display:block;padding:3.5px 0;transition:.2s;font-size:13.5px;color:inherit}
.foot-grid a:hover{color:#fff}
.foot-grid .qr{width:96px;height:96px;border:1px dashed rgba(150,185,215,.4);border-radius:10px;display:grid;place-items:center;color:#6d89a1;font-size:11.5px;text-align:center;line-height:1.5}
.copyright{text-align:center;padding-top:22px;font-size:12.5px;color:#5f7a91}

/* 页面内避免样式冲突的作用域类 */
.vlt-home{--navy:#014e50;--blue:#017173;--red:#017173;--ink:#162635;--muted:#66788a;--line:#dce5ec;--soft:#edf5fa;--max:1220px}
.vlt-home .wrap{width:min(1220px,calc(100% - 48px));margin:auto}
.vlt-home .kicker{display:inline-flex;align-items:center;gap:10px;color:#017173;font-weight:800;font-size:12px;letter-spacing:.18em;text-transform:uppercase}
.vlt-home .kicker::before{content:"";width:26px;height:2px;background:#017173}
.vlt-home .h2{font-size:clamp(28px,3.2vw,42px);letter-spacing:-.03em;line-height:1.2;margin:0 0 14px}
.vlt-home .section{padding:92px 0}
.vlt-home .section.soft{background:linear-gradient(180deg,#fff, #edf5fa)}
.vlt-home .section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:44px;flex-wrap:wrap}
.vlt-home .section-head > div > p{margin:10px 0 0;color:#66788a;max-width:55ch}
.vlt-home .link-more{color:#017173;font-weight:700;font-size:14.5px;white-space:nowrap;transition:.2s}
.vlt-home .link-more:hover{color:#017173}

/* Reveal 动画 */
.rv{opacity:0;transform:translateY(24px);transition:opacity .6s ease, transform .6s ease}
.rv.on{opacity:1;transform:none}

/* Mega menu styles (在 nav.htm 中使用) */
.mega{position:absolute;top:100%;left:-20px;width:560px;background:#fff;border:1px solid #dce5ec;border-radius:14px;box-shadow:0 14px 40px rgba(10,37,62,.12);padding:18px;display:none;grid-template-columns:1fr 1fr;gap:4px 18px;z-index:60}
.menu li:hover .mega{display:grid}
.mega a{display:flex;justify-content:space-between;padding:9px 12px;border-radius:8px;font-size:14.5px;color:#33506b;transition:.2s}
.mega a:hover{background:#edf5fa;color:#017173}
.mega a small{color:#9db2c4;font-size:12px}
.mega .mh{grid-column:1/-1;font-size:12px;font-weight:800;letter-spacing:.14em;color:#017173;padding:2px 12px 8px;border-bottom:1px dashed #dce5ec;margin-bottom:8px}

/* Mobile menu */
.nav-toggle{display:none;background:transparent;border:0;color:#fff;font-size:25px}
@media(max-width:960px){
  .nav-toggle{display:flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:8px;background:rgba(255,255,255,.1);color:#fff;font-size:22px}
  .nav-links{position:absolute;top:100%;left:0;right:0;background:var(--blue);flex-direction:column;padding:16px 0;display:none;box-shadow:0 12px 24px rgba(0,0,0,.15)}
  .nav-links.is-open{display:flex}
  .nav-links a{padding:14px 24px;border-bottom:1px solid rgba(255,255,255,.1);min-height:auto}
  .nav-links a:last-child{border-bottom:0}
  .nav-tools{padding:0 24px 16px}
  .nav-tools .nav-cta{width:100%;justify-content:center}
  .nav .mega{position:static;display:none;grid-template-columns:1fr;width:auto;border:0;box-shadow:none;padding:8px 0 8px 16px;background:rgba(255,255,255,.08)}
  .menu li.open .mega{display:grid}
}
@media(max-width:600px){
  .hero-grid{grid-template-columns:1fr}
  .hero-grid{padding:44px 0 56px}
  .hero h1{font-size:34px}
  .hero-actions{flex-direction:column}
  .hero-actions .btn{width:100%;justify-content:center}
  .stats .wrap{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr}
  .hero-grid{padding:44px 0 56px}
  .hero h1{font-size:34px}
  .section{padding:64px 0}
  .section-head{margin-bottom:32px}
  .hero .lead{font-size:16px}
  .chips{gap:8px}
  .chip{font-size:12px;padding:6px 12px}
  .hero-actions{gap:10px}
  .hero-actions .btn{width:100%;justify-content:center}
}

/* Reveal animation */
.rv{opacity:0;transform:translateY(24px);transition:opacity .6s ease, transform .6s ease}
.rv.on{opacity:1;transform:none}
.stagger > *{opacity:0;transform:translateY(24px);animation:reveal .6s ease forwards}
@keyframes reveal{to{opacity:1;transform:none}}
.stagger > *:nth-child(1){animation-delay:0ms}
.stagger > *:nth-child(2){animation-delay:70ms}
.stagger > *:nth-child(3){animation-delay:140ms}
.stagger > *:nth-child(4){animation-delay:210ms}
.stagger > *:nth-child(5){animation-delay:280ms}
.stagger > *:nth-child(5){animation-delay:350ms}
.stagger > *:nth-child(7){animation-delay:420ms}

/* 最终首页真实产品图布局，置于文件末尾以覆盖历史重复规则 */
.products-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.prod-card{padding:12px 12px 18px;border-radius:12px;background:#fff}
.prod-card .num{z-index:2;left:22px;right:auto;top:20px;width:30px;height:30px;border-radius:50%;background:rgba(255,255,255,.92);display:grid;place-items:center;color:#017173;font-size:11px;box-shadow:0 2px 10px rgba(10,37,62,.08)}
.prod-photo{height:190px;margin:0 0 17px;border-radius:8px;background:linear-gradient(135deg,#f3f6f8,#e6edf1);display:grid;place-items:center;overflow:hidden}
.prod-photo img{width:100%;height:100%;object-fit:contain;mix-blend-mode:multiply;transition:transform .4s ease}
.prod-card:hover .prod-photo img{transform:scale(1.055)}
.prod-card h3{padding:0 8px;margin:0 0 7px;font-size:20px}
.prod-card p{padding:0 8px;min-height:44px;font-size:13px;line-height:1.6}
.prod-more{display:flex;align-items:center;justify-content:space-between;padding:13px 8px 0;margin:14px 8px 0;border-top:1px solid #e8eef2;color:#017173;font-size:13px;font-weight:800}
.prod-card:hover .prod-more{color:#017173}
.feature-art{position:relative;min-height:510px;padding:40px;border-radius:18px;background:radial-gradient(circle at 50% 18%,#fff 0,#eff4f6 48%,#dfe8ec 100%);border:1px solid #d8e3e8;display:grid;place-items:center;overflow:hidden}
.feature-art::after{content:"";position:absolute;left:12%;right:12%;bottom:44px;height:15px;border-radius:50%;background:rgba(15,38,54,.2);filter:blur(9px)}
.feature-art img{position:relative;z-index:1;max-width:92%;max-height:405px;width:auto;height:auto;object-fit:contain;mix-blend-mode:multiply}
.feature-label{position:absolute;z-index:2;left:24px;top:22px;color:#017173;font-size:11px;font-weight:800;letter-spacing:.12em}
.featured .spec-table{max-height:405px;overflow:auto}
.featured .spec-table td{padding:9px 4px;font-size:14px}
@media(max-width:1080px){.products-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:720px){.products-grid{grid-template-columns:1fr}.prod-photo{height:230px}.feature-art{min-height:360px;padding:28px}.feature-art img{max-height:280px}}