/* 导航下拉菜单，参照 wayve.ai：
   鼠标停在菜单项上，整个窗口覆盖一层深色毛玻璃，导航条保持透明白字；
   白字直接排在毛玻璃上，竖线分四栏。切换菜单项时遮罩和竖线不动，只有内容淡入淡出。
   只在桌面宽度生效。 */

/* 导航条：打开时透明白字，叠在遮罩上（覆盖首页滚动后、平台页和占位页的白底） */
.v6-nav.is-mega-open{background:transparent;color:#fff;border-color:#ffffff26;box-shadow:none}
.v6-nav.is-mega-open .v6-nav-contact{border-color:#ffffff66}
.v6-nav .v6-nav-inner{position:relative;z-index:3}

.v6-nav .v6-mega-trigger{position:relative;display:inline-flex;align-items:center;gap:8px;padding:14px 0;border:0;background:none;color:inherit;font:inherit;cursor:pointer}
.v6-chevron{width:7px;height:7px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:translateY(-2px) rotate(45deg);transition:transform .25s}
.v6-mega-trigger[aria-expanded="true"] .v6-chevron{transform:translateY(2px) rotate(-135deg)}
.v6-mega-trigger::after{content:'';position:absolute;left:0;right:0;bottom:-8px;height:2px;background:linear-gradient(90deg,#3f7fe0,#5fd0e8);transform:scaleX(0);transition:transform .25s}
.v6-mega-trigger[aria-expanded="true"]::after{transform:scaleX(1)}

/* 整窗遮罩：深色 + 重度模糊 */
.v6-mega-backdrop{position:fixed;inset:0;z-index:1;margin:0;padding:0;border:0;cursor:default;
 background:#081729bf;-webkit-backdrop-filter:blur(48px) saturate(1.2);backdrop-filter:blur(48px) saturate(1.2);
 opacity:0;visibility:hidden;transition:opacity .3s,visibility .3s}
.v6-mega-backdrop.is-open{opacity:1;visibility:visible}

/* 内容层：无底色，排在遮罩上 */
.v6-mega{position:absolute;top:100%;left:0;right:0;z-index:2;color:#fff;
 opacity:0;visibility:hidden;transition:opacity .25s,visibility .25s}
.v6-mega.is-open{opacity:1;visibility:visible}
.v6-mega a{color:inherit;text-decoration:none}

.v6-mega-shell{width:90%;max-width:1600px;margin:auto;padding:50px 0 56px;display:grid;
 grid-template-columns:2.78fr 3.84fr 2.78fr 1.72fr;column-gap:40px}

/* 第一栏右侧、第三栏右侧各一条通到窗口底部的竖线 */
.v6-mega-intro,.v6-mega-featured{position:relative}
.v6-mega-intro::after,.v6-mega-featured::after{content:'';position:absolute;top:-50px;right:-20px;width:1px;height:100vh;background:#ffffff2e;pointer-events:none}

.v6-mega-title{display:inline-block;font-size:36px;font-weight:500;line-height:1.5}
.v6-mega-intro p{margin:10px 0 0;max-width:13em;color:#ffffffa6;font-size:18px;line-height:1.6}

.v6-mega-list{list-style:none;margin:0;padding:54px 0 0}
.v6-mega-list li{margin-bottom:22px}
.v6-mega-list li a{display:block}
.v6-mega-list strong{display:block;font-size:22px;font-weight:500;line-height:1.3}
.v6-mega-list span{display:block;max-width:20em;margin-top:6px;color:#ffffffa6;font-size:14px;line-height:1.55;transition:color .25s}
.v6-mega-list li a:hover span,.v6-mega-list li a:focus-visible span{color:#ffffffe6}
.v6-mega-list li a:hover strong{text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:6px}
.v6-mega-list .v6-mega-label{margin:8px 0 14px}
.v6-mega-list .v6-mega-label a,.v6-mega-list .v6-mega-label span{display:inline-flex;gap:6px;color:#ffffffa6;font-size:13px;letter-spacing:.08em}
.v6-mega-list .v6-mega-label a:hover{color:#fff}

/* 配图：几张叠在一起，只显示鼠标停留的那一项 */
.v6-mega-featured{display:grid;align-content:start;padding-top:58px}
.v6-mega-feature{grid-area:1/1;opacity:0;visibility:hidden;transition:opacity .25s,visibility .25s}
.v6-mega-feature.is-active{opacity:1;visibility:visible}
.v6-mega-feature strong{display:block;font-size:16px;font-weight:500}
/* 说明固定留两行，切换有无说明的条目时配图不跳动 */
.v6-mega-feature span{display:block;min-height:3.1em;margin-top:6px;color:#ffffffa6;font-size:14px;line-height:1.55}
.v6-mega-feature img{display:block;width:100%;height:auto;aspect-ratio:4/3;margin-top:16px;border-radius:16px;object-fit:cover;background:#ffffff14}

.v6-mega-quick{display:flex;flex-direction:column;align-items:flex-start;gap:14px;padding-top:64px}
.v6-mega-quick a{color:#ffffffe6;font-size:14px;letter-spacing:.12em}
.v6-mega-quick a:hover{color:#fff;text-decoration:underline;text-underline-offset:5px}
.v6-mega-quick .v6-mega-mail{margin-top:10px;color:#ffffffa6;font-size:13px;letter-spacing:0}

.v6-mega [aria-current="page"],.v6-mega [aria-current="page"] strong{color:#8fc4ff}

@media (max-width:1279px){
 .v6-mega-shell{grid-template-columns:2.4fr 3.6fr 2.8fr;column-gap:36px}
 .v6-mega-quick{display:none}
 .v6-mega-featured::after{display:none}
}
@media (max-width:1023px){.v6-mega,.v6-mega-backdrop{display:none}}
@supports not ((backdrop-filter:blur(1px)) or (-webkit-backdrop-filter:blur(1px))){.v6-mega-backdrop{background:#081729f2}}
@media (prefers-reduced-motion:reduce){.v6-mega,.v6-mega-backdrop,.v6-mega-feature,.v6-chevron,.v6-mega-trigger::after{transition:none}}
/* 分组之间留出间距和细线，避免后一组看起来属于前一组 */
.v6-mega-list .v6-mega-label:not(:first-child),.v6-mega-list .v6-mega-top:not(:first-child){margin-top:20px;padding-top:18px;border-top:1px solid #ffffff1f}

/* 产品预览保留原图比例，避免横向无人机和方形装备被裁切。 */
#mega-products .v6-mega-feature img{object-fit:contain;object-position:center}
#mega-products .v6-mega-feature:not([data-feature="0"]) img{box-sizing:border-box;padding:12px;background:#fff}
/* 产品中心三级：具身智能装备 → 无人机 / 地面机器人 / 列车 → 型号（2026-10-14） */
.v6-mega-list .v6-mega-sub{margin:4px 0 8px}
.v6-mega-list .v6-mega-sub strong{font-size:19px;font-weight:600}
.v6-mega-list .v6-mega-subitem{margin:0 0 8px;padding-left:16px;border-left:1px solid #ffffff2e}
.v6-mega-list .v6-mega-subitem strong{font-size:16px;font-weight:400;color:#ffffffd9}
.v6-mega-list .v6-mega-subitem:last-of-type,.v6-mega-list .v6-mega-subitem+.v6-mega-sub{margin-top:0}
.v6-mega-list .v6-mega-subitem+.v6-mega-sub{padding-top:10px}

/* 解决方案：按行业分两栏并列（2026-10-16），列表栏加宽，其他栏相应收窄 */
.v6-mega-shell--cols{grid-template-columns:2.3fr 5.4fr 2.4fr 1.5fr}
.v6-mega-cols{display:grid;grid-template-columns:1fr 1fr;column-gap:40px}
.v6-mega-cols .v6-mega-list strong{font-size:20px}
@media (max-width:1279px){
 .v6-mega-shell--cols{grid-template-columns:2fr 5fr 2.4fr}
 .v6-mega-cols{column-gap:28px}
 .v6-mega-cols .v6-mega-list strong{font-size:18px}
}