/* =========================================================
   托普拉 Toppla 品牌网站 — 设计系统 base.css
   配色：自信蓝(主) + 生态绿(辅) | 参考：希沃 / 青鹿
   ========================================================= */

:root{
  /* 品牌色 */
  --brand:        #66C0EE;   /* 主蓝（天空蓝） */
  --brand-600:    #2FA3DC;   /* 加深：悬停/实心按钮 */
  --brand-700:    #1B84BC;   /* 最深：文字/深色区 */
  --brand-50:     #ECF7FD;   /* 浅色底/标签 */
  --accent:       #66C0EE;   /* 辅助蓝（同天空蓝） */
  --accent-600:   #2FA3DC;
  --accent-50:    #ECF7FD;
  /* 文字 */
  --ink:          #141B26;
  --ink-2:        #3A4456;
  --muted:        #6B7686;
  --muted-2:      #9AA4B2;
  /* 背景与线 */
  --bg:           #FFFFFF;
  --bg-soft:      #F4F8FD;
  --bg-soft-2:    #EEF3FA;
  --line:         #E5ECF4;
  --line-strong:  #D3DDEA;
  /* 功能色 */
  --warn: #F5A623; --err:#E5484D; --ok:#66C0EE;
  --radius: 14px; --radius-lg: 22px; --radius-sm: 10px;
  --shadow-sm: 0 2px 10px rgba(20,40,80,.06);
  --shadow:    0 10px 30px rgba(20,40,80,.10);
  --shadow-lg: 0 24px 60px rgba(20,40,80,.16);
  --maxw: 1240px;
  --header-h: 72px;
  --font: "PingFang SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans CN",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.7;font-size:15px;overflow-x:hidden}
a{color:inherit;text-decoration:none;transition:.2s}
img{max-width:100%;display:block}
ul,ol{list-style:none}
.container{width:min(var(--maxw),92vw);margin-inline:auto}
.container-wide{width:min(1360px,94vw);margin-inline:auto}
.section{padding:84px 0}
.section-sm{padding:56px 0}
.bg-soft{background:var(--bg-soft)}
.bg-grad{background:linear-gradient(180deg,#F4F8FD 0%,#FFFFFF 100%)}

/* ---------- 文字工具 ---------- */
.h-eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;letter-spacing:.12em;color:var(--brand);text-transform:uppercase}
.h-eyebrow::before{content:"";width:26px;height:2px;background:var(--brand);border-radius:2px}
.h-title{font-size:clamp(26px,3.4vw,40px);font-weight:800;letter-spacing:-.01em;line-height:1.25;color:var(--ink)}
.h-title .hl{color:var(--brand)}
.h-sub{margin-top:14px;color:var(--muted);font-size:16px;max-width:720px}
.center{text-align:center}
.center .h-sub{margin-inline:auto}
.lead{color:var(--ink-2);font-size:16px}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:48px;padding:0 26px;border-radius:999px;font-weight:700;font-size:15px;border:1.5px solid transparent;cursor:pointer;transition:.22s;white-space:nowrap}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-600));color:#fff;box-shadow:0 8px 20px rgba(47,163,220,.32)}
.btn-primary:hover{background:linear-gradient(135deg,var(--brand-600),var(--brand-700));transform:translateY(-2px);box-shadow:0 14px 28px rgba(27,132,188,.38)}
.btn-ghost{background:#fff;color:var(--brand);border-color:var(--line-strong)}
.btn-ghost:hover{border-color:var(--brand);background:var(--brand-50)}
.btn-light{background:#fff;color:var(--ink)}
.btn-light:hover{background:var(--bg-soft)}
.btn-line-light{background:transparent;color:#fff;border-color:rgba(255,255,255,.55)}
.btn-line-light:hover{background:rgba(255,255,255,.12);border-color:#fff}
.btn-sm{height:40px;padding:0 18px;font-size:14px}
.btn .arrow{transition:.22s}
.btn:hover .arrow{transform:translateX(4px)}

/* ---------- 顶部条 + 导航 ---------- */
.topbar{background:#66C0EE;color:#0b2a40;font-size:13px}
.topbar .container{display:flex;justify-content:space-between;align-items:center;height:38px}
.topbar a{color:#0b3a57}
.topbar a:hover{color:#062033}
.header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:saturate(160%) blur(12px);border-bottom:1px solid var(--line)}
.header .bar{display:flex;align-items:center;gap:12px;height:var(--header-h)}
.logo{display:flex;align-items:center;gap:8px;font-weight:800;font-size:18px;letter-spacing:.02em;flex-shrink:0}
.logo .mark{width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,var(--brand),var(--accent));display:grid;place-items:center;color:#fff;font-weight:900;font-size:16px;box-shadow:0 6px 14px rgba(47,163,220,.35)}
.logo small{display:block;font-size:11px;font-weight:600;color:var(--muted);letter-spacing:.18em}
.nav{display:flex;flex-wrap:nowrap;gap:0;margin-left:auto}
.nav>li{position:relative;flex-shrink:0}
.nav>li>a{display:flex;align-items:center;gap:1px;height:var(--header-h);padding:0 10px;font-weight:600;color:var(--ink-2);font-size:14px;white-space:nowrap;position:relative}
.nav>li>a::after{content:"";position:absolute;left:10px;right:10px;bottom:18px;height:2px;background:var(--brand);transform:scaleX(0);transition:.22s;transform-origin:left}
.nav>li:hover>a{color:var(--brand)}
.nav>li:hover>a::after{transform:scaleX(1)}
.nav .caret{font-size:10px;opacity:.6}
/*  mega menu */
.mega{position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(10px);min-width:560px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-lg);padding:20px;display:grid;grid-template-columns:1fr 1fr;gap:6px 26px;opacity:0;visibility:hidden;transition:.22s;z-index:60}
.nav>li:hover .mega{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
.mega a{display:flex;flex-direction:column;gap:2px;padding:10px 12px;border-radius:10px}
.mega a:hover{background:var(--brand-50)}
.mega a b{font-weight:700;color:var(--ink);font-size:14px}
.mega a span{font-size:12px;color:var(--muted)}
.header-cta{display:flex;align-items:center;gap:8px;flex-shrink:0}
.header-cta .phone{font-weight:800;color:var(--brand);font-size:15px}
.burger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.burger span{width:24px;height:2px;background:var(--ink);border-radius:2px}

/* ---------- 首屏：整版全屏视频背景 ---------- */
.hero{position:relative;height:100vh;min-height:560px;overflow:hidden;background:#06122b;display:flex;align-items:center}
/* 视频放大+上移，底部硬字幕被 overflow:hidden 裁掉 */
.hero-video{position:absolute;left:0;top:0;width:100%;height:115%;object-fit:cover;object-position:center top;z-index:0}
/* 浏览器渲染的字幕轨道也一并屏蔽 */
.hero-video::cue,.hero-video::-webkit-media-text-track-display,.hero-video::-webkit-media-text-track-container{display:none!important;visibility:hidden!important;opacity:0!important}
.hero-video__mask{position:absolute;inset:0;z-index:1;background:linear-gradient(90deg,rgba(4,14,38,.35) 0%,rgba(4,14,38,.12) 50%,transparent 75%)}
.hero .container{position:relative;z-index:2;width:min(var(--maxw),92vw);color:#fff}
.hero .eyebrow{color:#9fd8ff;font-weight:700;letter-spacing:.16em;font-size:13px}
.hero h1{font-size:clamp(30px,4.6vw,58px);font-weight:850;line-height:1.15;margin:14px 0 18px;text-shadow:0 4px 24px rgba(0,0,0,.35)}
.hero p{font-size:clamp(15px,1.6vw,19px);max-width:560px;color:#e7eefc;margin-bottom:28px}
.hero .btn{font-size:16px;padding:13px 26px}
.hero-scroll{position:absolute;bottom:22px;left:50%;transform:translateX(-50%);z-index:3;color:rgba(255,255,255,.72);font-size:11px;letter-spacing:.24em;display:flex;flex-direction:column;align-items:center;gap:7px}
.hero-scroll .mouse{width:22px;height:34px;border:2px solid rgba(255,255,255,.6);border-radius:12px;position:relative}
.hero-scroll .mouse::after{content:"";position:absolute;top:6px;left:50%;width:3px;height:7px;border-radius:2px;background:#fff;transform:translateX(-50%);animation:scrollDot 1.6s infinite}
@keyframes scrollDot{0%{opacity:0;transform:translate(-50%,0)}40%{opacity:1}100%{opacity:0;transform:translate(-50%,12px)}}

/* 首屏切换按钮组 */
.hero-tabs{position:absolute;bottom:70px;left:50%;transform:translateX(-50%);z-index:5;display:flex;gap:8px}
.hero-tab{background:rgba(255,255,255,.12);color:rgba(255,255,255,.8);border:1px solid rgba(255,255,255,.25);padding:10px 22px;border-radius:999px;font-size:14px;font-weight:600;cursor:pointer;backdrop-filter:blur(6px);transition:.28s;white-space:nowrap}
.hero-tab:hover{background:rgba(255,255,255,.22);color:#fff}
.hero-tab.active{background:#fff;color:#06122b;border-color:#fff;font-weight:800;box-shadow:0 4px 20px rgba(0,0,0,.25)}
.hero-text{animation:heroFadeIn .5s ease both}
@keyframes heroFadeIn{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}

/* ---------- 实力展示 ---------- */
.stats{background:linear-gradient(120deg,var(--brand-600),var(--brand-700));color:#fff;border-radius:var(--radius-lg);padding:42px 40px;display:grid;grid-template-columns:repeat(5,1fr);gap:20px;margin-top:-44px;position:relative;z-index:8;box-shadow:var(--shadow-lg)}
.stats .s b{font-size:clamp(24px,2.6vw,34px);font-weight:850;display:block;line-height:1.1}
.stats .s span{font-size:13px;color:#cfe0ff;display:block;margin-top:6px}
.stats .s{position:relative;padding-left:16px}
.stats .s::before{content:"";position:absolute;left:0;top:6px;bottom:6px;width:3px;border-radius:3px;background:rgba(255,255,255,.35)}

/* ---------- 卡片/网格 ---------- */
.grid{display:grid;gap:24px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-auto{grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}

.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.25s;height:100%;display:flex;flex-direction:column}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--line-strong)}
.card .thumb{aspect-ratio:16/10;background:var(--bg-soft-2);position:relative;overflow:hidden}
.card .thumb .ph{position:absolute;inset:0;display:grid;place-items:center;color:var(--muted-2);font-size:13px;letter-spacing:.05em}
.card .body{padding:20px 20px 22px;display:flex;flex-direction:column;gap:8px;flex:1}
.card h3{font-size:18px;font-weight:800}
.card .meta{font-size:13px;color:var(--muted);display:flex;gap:12px;flex-wrap:wrap}
.card .tag{display:inline-block;font-size:12px;font-weight:700;color:var(--brand);background:var(--brand-50);padding:3px 10px;border-radius:999px}
.card p{color:var(--ink-2);font-size:14px}
.card .more{margin-top:auto;color:var(--brand);font-weight:700;font-size:14px;display:inline-flex;align-items:center;gap:6px}
.card-link{color:var(--brand);font-weight:700;font-size:14px;display:inline-flex;align-items:center;gap:6px}

/* 方案图标卡 */
.sol-card{display:flex;gap:16px;align-items:flex-start;padding:22px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;transition:.22s}
.sol-card:hover{border-color:var(--brand);box-shadow:var(--shadow-sm);transform:translateY(-3px)}
.sol-card .ic{width:52px;height:52px;border-radius:14px;background:var(--brand-50);color:var(--brand);display:grid;place-items:center;font-size:24px;flex:none}
.sol-card h4{font-size:17px;font-weight:800;margin-bottom:4px}
.sol-card p{font-size:13.5px;color:var(--muted)}

/* ========== 解决方案 —— 整屏Tab切换（仿希沃 seewo.com） ========== */
.sol-showcase{padding:90px 0 100px;background:#fff;overflow:hidden}
.sol-head{margin-bottom:36px;max-width:720px}
.sol-head .h-sub{margin-top:16px;font-size:16px;line-height:1.8}

/* Tab 栏 */
.sol-tabs{display:flex;gap:0;border-bottom:2px solid var(--line);margin-bottom:48px;position:relative}
.sol-tab{position:relative;background:none;border:none;height:52px;padding:0 32px;font-family:inherit;font-size:17px;font-weight:700;color:var(--muted-2);cursor:pointer;transition:.25s;letter-spacing:.02em}
.sol-tab::after{content:"";position:absolute;left:24px;right:24px;bottom:-2px;height:3px;background:var(--brand);border-radius:3px 3px 0 0;transform:scaleX(0);transition:.28s cubic-bezier(.4,0,.2,1)}
.sol-tab:hover{color:var(--brand)}
.sol-tab.active{color:var(--brand-700);font-size:18px}
.sol-tab.active::after{transform:scaleX(1)}

/* 面板容器 */
.sol-panel-wrap{position:relative;min-height:420px}
.sol-panel{display:none;animation:solFadeIn .5s ease both}
.sol-panel.active{display:block}

@keyframes solFadeIn{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:none}}

/* 面板内部：左文右图 */
.sol-panel__inner{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.sol-info h3{font-size:clamp(24px,2.8vw,34px);font-weight:850;line-height:1.3;margin-bottom:22px;color:var(--ink)}
.sol-info p{font-size:16px;line-height:1.9;color:var(--ink-2);max-width:520px;margin-bottom:32px}
.sol-info .btn{height:50px;font-size:15px;padding:0 30px}

/* 右侧配图区 */
.sol-img{position:relative}
.sol-img img{width:100%;height:auto;aspect-ratio:16/10;object-fit:cover;border-radius:var(--radius-lg);box-shadow:var(--shadow);transition:.35s}
.sol-img img:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.sol-img__placeholder{aspect-ratio:16/10;background:linear-gradient(145deg,var(--bg-soft),var(--bg-soft-2));border:2px dashed var(--line-strong);border-radius:var(--radius-lg);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;color:var(--muted);font-size:18px;font-weight:700;transition:.3s}
.sol-img__placeholder:hover{border-color:var(--brand);background:var(--brand-50);color:var(--brand)}
.sol-img__placeholder small{font-size:13px;font-weight:400;color:var(--muted-2)}

/* ---------- 案例水平轮播（容器内，左右截断露出半张卡片） ---------- */
.case-carousel-section{padding:56px 0 64px}
.case-carousel-wrap{
  overflow:hidden;margin-top:-10px;position:relative;
  margin-left:-80px;margin-right:-80px;
}
/* 无渐变遮罩，卡片到容器边缘自然截断消失 */
.case-carousel{
  display:flex;gap:24px;padding:20px 50px 30px;
  width:max-content;
  animation:caseScroll 25s linear infinite;
}
.case-carousel:hover{animation-play-state:paused}
.case-slide{
  flex:none;width:400px;border-radius:var(--radius-lg);overflow:hidden;
  display:block;text-decoration:none;color:inherit;transition:.35s;
  box-shadow:var(--shadow-sm);border:1px solid var(--line);
  background:#fff;
}
.case-slide:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:var(--brand)}
/* 背景图区域 */
.case-slide__bg{width:100%;height:220px;overflow:hidden;background:var(--bg-soft-2)}
.case-slide__bg img{width:100%;height:100%;object-fit:cover;transition:.5s}
.case-slide:hover .case-slide__bg img{transform:scale(1.06)}
.case-slide__ph{
  width:100%;height:100%;
  background:linear-gradient(135deg,#e8f4ec,#d4ebdf);
  display:grid;place-items:center;color:var(--muted-2);font-size:13px
}
/* 文字区（底部白色卡片，清晰无蒙版） */
.case-slide__info{padding:18px 20px}
.case-slide__tag{
  display:inline-block;font-size:11px;font-weight:700;padding:3px 10px;
  border-radius:999px;background:var(--brand-50);color:var(--brand);
  letter-spacing:.04em;margin-bottom:8px
}
.case-slide__title{
  font-size:17px;font-weight:850;line-height:1.3;margin-bottom:6px;
  color:var(--ink)
}
.case-slide__sub{
  font-size:13.5px;color:var(--muted);line-height:1.5;margin:0
}
.case-slide__loc{
  margin-top:8px;font-size:12px;color:var(--muted-2)
}
@keyframes caseScroll{
  0%{transform:translateX(0)}
  100%{transform:translateX(-50%)}  /* 滚动到一半实现无缝循环 */
}

@media(max-width:1100px){
  .case-slide{width:340px}
  .case-slide__bg{height:190px}
  .case-slide__title{font-size:16px}
  .case-carousel-wrap{margin-left:-50px;margin-right:-50px}
}
@media(max-width:768px){
  .case-carousel-section{padding:40px 0 50px}
  .case-slide{width:280px}
  .case-slide__bg{height:160px}
  .case-carousel{gap:16px;padding:16px 20px 24px}
  .case-carousel-wrap{margin-left:-20px;margin-right:-20px}
  .case-slide__info{padding:14px 16px}
  .case-slide__title{font-size:15px}
}

/* 场景拓扑 */
.topo{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:30px;position:relative;overflow:hidden}
.topo .center-node{width:150px;height:150px;border-radius:24px;background:linear-gradient(135deg,var(--brand-600),var(--accent-600));color:#fff;display:grid;place-items:center;text-align:center;font-weight:800;margin:0 auto;box-shadow:var(--shadow)}
.topo .nodes{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:26px}
.topo .node{background:var(--bg-soft);border:1px solid var(--line);border-radius:12px;padding:14px;text-align:center;font-weight:700;color:var(--ink-2);transition:.2s;cursor:pointer}
.topo .node:hover{background:var(--brand-50);color:var(--brand);border-color:var(--brand)}

/* 快速入口 */
.quick{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.quick a{display:flex;flex-direction:column;gap:10px;padding:26px;border-radius:var(--radius);background:linear-gradient(135deg,#fff,#f7faff);border:1px solid var(--line);transition:.22s}
.quick a:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--brand)}
.quick .ic{width:46px;height:46px;border-radius:12px;background:var(--brand-50);color:var(--brand);display:grid;place-items:center;font-size:22px}
.quick b{font-size:16px}
.quick span{font-size:13px;color:var(--muted)}

/* 资质荣誉卡片 */
.honor-card{transition:.35s}
.honor-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.honor-card .thumb{aspect-ratio:4/3;background:#fff;border-bottom:1px solid var(--line)}

/* 新闻资讯 —— 仿青鹿 qljy.com（左2大图+右列表） */
.news-qinglu{padding:56px 0 64px}
.news-ql{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:stretch}
/* 左侧大图卡片 */
.news-ql__featured{display:flex;flex-direction:column;gap:20px;height:100%}
/* 单卡片模式：撑满右侧列表等高 */
.news-ql__featured--single .news-ql__hero{height:100%;display:flex;flex-direction:column}
.news-ql__featured--single .news-ql__hero-img{flex:1;min-height:280px}
.news-ql__hero{display:block;border-radius:var(--radius-lg);overflow:hidden;background:#fff;border:1px solid var(--line);transition:.3s;text-decoration:none;color:inherit}
.news-ql__hero:hover{box-shadow:var(--shadow-lg);transform:translateY(-3px)}
.news-ql__hero-img{aspect-ratio:16/10;position:relative;overflow:hidden;background:var(--bg-soft-2)}
.news-ql__hero-img img{width:100%;height:100%;object-fit:cover;transition:.5s}
.news-ql__hero:hover .news-ql__hero-img img{transform:scale(1.05)}
.news-ql__ph{width:100%;height:100%;background:linear-gradient(135deg,var(--brand),var(--accent))}
.news-ql__hero-body{padding:18px 20px}
.news-ql__hero-body h3{font-size:17px;font-weight:800;line-height:1.4;margin-bottom:6px}
.news-ql__hero-body p{font-size:13.5px;color:var(--muted);line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
/* 右侧新闻列表 */
.news-ql__list-wrap{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:24px;height:100%}
.news-ql__list-title{font-size:18px;font-weight:800;margin-bottom:16px;padding-bottom:12px;border-bottom:2px solid var(--brand)}
.news-ql__list a{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;padding:12px 0;border-bottom:1px solid var(--line);color:var(--ink-2);text-decoration:none;transition:.2s}
.news-ql__list a:last-child{border:none}
.news-ql__list a:hover .news-ql__list-txt{color:var(--brand)}
.news-ql__list-txt{font-size:14.5px;font-weight:600;line-height:1.5;flex:1}
.news-ql__list-date{font-size:12.5px;color:var(--muted);white-space:nowrap;flex:none;margin-top:2px}

@media(max-width:860px){
  .news-qinglu{padding:40px 0 50px}
  .news-ql{grid-template-columns:1fr;gap:28px}
}

/* 面包屑 */
.crumb{font-size:13px;color:var(--muted);padding:18px 0}
.crumb a:hover{color:var(--brand)}
.crumb .sep{margin:0 8px;color:var(--muted-2)}

/* 页脚 */
.footer{background:#EDF5FB;color:var(--ink-2);font-size:14px;padding:60px 0 26px}
.footer h5{color:var(--ink);font-size:15px;font-weight:800;margin-bottom:16px;letter-spacing:.04em}
.footer a{color:var(--ink-2);display:block;padding:5px 0}
.footer a:hover{color:var(--brand)}
.footer .brand{display:flex;gap:12px;align-items:center;color:var(--ink);font-weight:800;font-size:20px;margin-bottom:14px}
.footer .cols{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr 1fr;gap:30px}
.footer .bottom{border-top:1px solid var(--line);margin-top:40px;padding-top:20px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:13px;color:var(--muted)}
.footer .links-inline a{display:inline;margin-right:14px}

/* 区块标题行 */
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:38px;flex-wrap:wrap}
.sec-head .right{display:flex;gap:10px;align-items:center}

/* 标签筛选 */
.tabs{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:30px}
.tabs button{border:1px solid var(--line-strong);background:#fff;color:var(--ink-2);height:42px;padding:0 20px;border-radius:999px;font-weight:600;cursor:pointer;transition:.2s}
.tabs button.active{background:var(--brand);color:#fff;border-color:var(--brand)}
.tabs button:hover{border-color:var(--brand);color:var(--brand)}
.tabs button.active:hover{color:#fff}

/* 详情页布局 */
.detail-hero{background:linear-gradient(120deg,var(--brand-600),var(--brand-700));color:#fff;padding:64px 0}
.detail-hero h1{font-size:clamp(28px,3.4vw,42px);font-weight:850;margin:10px 0}
.detail-hero .eyebrow{color:#9fd8ff;font-weight:700;letter-spacing:.14em}
.layout{display:grid;grid-template-columns:1fr 320px;gap:40px;align-items:start}
.side-card{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.side-card h5{font-size:15px;margin-bottom:12px}
.prose h2{font-size:24px;font-weight:800;margin:34px 0 14px}
.prose h3{font-size:19px;font-weight:800;margin:26px 0 10px}
.prose p{margin-bottom:14px;color:var(--ink-2)}
.prose ul{margin:0 0 14px 0;display:grid;gap:8px}
.prose ul li{padding-left:22px;position:relative;color:var(--ink-2)}
.prose ul li::before{content:"";position:absolute;left:0;top:10px;width:8px;height:8px;border-radius:50%;background:var(--brand)}
.prose img{max-width:100%;height:auto;border-radius:12px;margin:16px 0;box-shadow:0 2px 12px rgba(0,0,0,.08);display:block}
.prose img[src*="placeholder"],.prose img:not([src]){display:none}
.rel-products{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}

/* 表单 */
.field{margin-bottom:18px}
.field label{display:block;font-weight:700;margin-bottom:8px;font-size:14px}
.field input,.field textarea,.field select{width:100%;height:48px;padding:0 14px;border:1.5px solid var(--line-strong);border-radius:10px;font-family:inherit;font-size:15px;background:#fff;transition:.2s}
.field textarea{height:130px;padding:12px 14px;resize:vertical}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-50)}
.form-note{font-size:13px;color:var(--muted)}

/* 联系信息块 */
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.contact-grid .c{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.contact-grid .c .ic{width:44px;height:44px;border-radius:12px;background:var(--accent-50);color:var(--accent-600);display:grid;place-items:center;font-size:20px;margin-bottom:12px}

/* 在线留言表单 */
.pbform{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px}
.pbform .field{margin-bottom:18px}
.pbform label{display:block;font-size:14px;font-weight:700;color:var(--ink);margin-bottom:6px}
.pbform label .req{color:#e53935;margin-left:2px}
.pbform input,.pbform textarea{width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:10px;font-size:15px;color:var(--ink);background:var(--bg-soft-2);transition:.22s;box-sizing:border-box;font-family:inherit}
.pbform input:focus,.pbform textarea:focus{outline:none;border-color:var(--brand);background:#fff;box-shadow:0 0 0 3px rgba(47,163,220,.12)}
.pbform textarea{resize:vertical;min-height:90px;line-height:1.6}

/* CTA 条 */
.cta-band{background:linear-gradient(120deg,var(--accent),var(--accent-600));color:#fff;border-radius:var(--radius-lg);padding:48px;display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap}
.cta-band h2{font-size:28px;font-weight:850}
.cta-band p{opacity:.92;margin-top:6px}

/* 聊天窗口(客户服务) */
.chat-fab{position:fixed;right:26px;bottom:26px;z-index:80;width:60px;height:60px;border-radius:50%;background:var(--brand);color:#fff;display:grid;place-items:center;font-size:26px;box-shadow:var(--shadow-lg);cursor:pointer;border:0}
.chat-panel{position:fixed;right:26px;bottom:26px;z-index:90;width:360px;max-width:92vw;height:520px;background:#fff;border-radius:18px;box-shadow:var(--shadow-lg);display:none;flex-direction:column;overflow:hidden;border:1px solid var(--line)}
.chat-panel.open{display:flex}
.chat-head{background:linear-gradient(120deg,var(--brand-600),var(--brand-700));color:#fff;padding:16px 18px;display:flex;align-items:center;gap:10px;justify-content:space-between}
.chat-body{flex:1;overflow:auto;padding:16px;background:var(--bg-soft);display:flex;flex-direction:column;gap:12px}
.msg{max-width:78%;padding:10px 14px;border-radius:14px;font-size:14px;line-height:1.5}
.msg.bot{background:#fff;border:1px solid var(--line);align-self:flex-start;border-bottom-left-radius:4px}
.msg.me{background:var(--brand);color:#fff;align-self:flex-end;border-bottom-right-radius:4px}
.chat-input{display:flex;gap:8px;padding:12px;border-top:1px solid var(--line)}
.chat-input input{flex:1;height:42px;border:1.5px solid var(--line-strong);border-radius:10px;padding:0 12px;font-family:inherit}
.chat-input button{border:0;background:var(--brand);color:#fff;width:48px;border-radius:10px;cursor:pointer;font-size:18px}

/* 滚动入场动画 */
.reveal{opacity:0;transform:translateY(24px);transition:.7s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

/* 响应式 */
@media(max-width:1100px){
  .stats{grid-template-columns:repeat(3,1fr)}
  .footer .cols{grid-template-columns:1fr 1fr 1fr}
  .layout{grid-template-columns:1fr}
  .quick{grid-template-columns:repeat(2,1fr)}
  .sol-panel__inner{gap:40px;grid-template-columns:1fr 1fr}
}
@media(max-width:860px){
  .nav,.header-cta .phone{display:none}
  .burger{display:flex}
  .header .bar{gap:14px}
  .grid-3,.grid-4,.rel-products,.contact-grid{grid-template-columns:1fr 1fr}
  .topo .nodes{grid-template-columns:repeat(2,1fr)}
  .stats{grid-template-columns:repeat(2,1fr);margin-top:-30px}
  .hero{height:100vh;min-height:480px}
  .mega{display:none}
  /* 解决方案响应式 */
  .sol-panel__inner{grid-template-columns:1fr;gap:32px}
  .sol-img__placeholder{aspect-ratio:16/9}
  .sol-info p{max-width:100%}
}
@media(max-width:560px){
  .grid-2,.grid-3,.grid-4,.quick,.rel-products,.contact-grid{grid-template-columns:1fr}
  .section{padding:56px 0}
  .hero{height:100vh;min-height:420px}
  .stats{grid-template-columns:1fr 1fr}
  .footer .cols{grid-template-columns:1fr 1fr}
}