/* ==========================================================================
   郑州启凡软件官网首页 · V4.0 静态 HTML 实施样式
   规范：科技 SaaS 企业官网 · 1300px 栅格 · 主色 #1677FF
   ========================================================================== */

:root{
  --primary:#1677FF;
  --primary-hover:#0F66DD;
  --primary-soft:#EAF3FF;
  --navy:#29497b;
  --navy-2:#142E52;
  --text:#102033;
  --text-2:#34475B;
  --muted:#6B7C8F;
  --muted-2:#94A3B3;
  --white:#FFFFFF;
  --bg:#F7F9FC;
  --border:#E5ECF4;
  --success:#16A36A;
  --warning:#F59E0B;
  --danger:#EF4444;
  --container:1300px;
  --radius-sm:8px;
  --radius-md:12px;
  --radius-lg:16px;
  --radius-xl:24px;
  --ease:cubic-bezier(0.22,1,0.36,1);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  color:var(--text);
  background:#fff;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
ul{list-style:none}
button{font-family:inherit;cursor:pointer}
::selection{background:var(--primary);color:#fff}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:2px}

.container{width:min(var(--container),calc(100% - 48px));margin:0 auto}
.section{padding:60px 0}
section[id]{scroll-margin-top:80px}

h2{font-size:34px;line-height:1.3;font-weight:700;letter-spacing:-.01em}
.section-eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;letter-spacing:.14em;color:var(--primary);margin-bottom:10px}
.section-eyebrow::before{content:'';width:16px;height:3px;border-radius:2px;background:var(--primary)}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:44px}
.section-head.light .section-eyebrow{color:#6EA8FF}
.section-head.light .section-eyebrow::before{background:#4D9AFF}
.section-head.light h2{color:#fff}
.section-desc{font-size:14.5px;color:var(--muted);text-align:right}
.section-head.light .section-desc{color:#fff}
.section-link{display:inline-flex;align-items:center;gap:4px;padding:6px 14px;border-radius:999px;background:var(--primary-soft);color:var(--primary);font-size:14px;font-weight:600;white-space:nowrap;transition:background .16s var(--ease),color .16s var(--ease)}
.section-link:hover{background:var(--primary);color:#fff;text-decoration:none}
.section-note{margin-top:28px;font-size:13px;color:var(--muted-2);text-align:center}

.section-head .section-eyebrow{display:block}
.section-head .section-eyebrow::before{display:inline-block;vertical-align:middle;    content: '';
    width: 12px;
    height: 2px;
    border-radius: 2px;
    background: var(--primary);
    margin-right: 10px;
    position: relative;
    top: -2px;}
.section-head h2{position:relative;color:var(--text);display:inline;background-image:linear-gradient(180deg,transparent 70%,rgba(22,119,255,.38) 55%);background-repeat:no-repeat;padding:0 6px;box-decoration-break:clone;-webkit-box-decoration-break:clone}
.section--dark .section-head h2{background-image:linear-gradient(180deg,transparent 55%,rgba(77,154,255,.55) 55%)}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:none;border-radius:var(--radius-sm);font-size:15px;font-weight:600;line-height:1;padding:0 22px;height:44px;white-space:nowrap;transition:background .16s var(--ease),box-shadow .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease)}
.btn-lg{height:50px;padding:0 28px;font-size:16px}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-hover);box-shadow:0 8px 22px rgba(22,119,255,.32)}
.btn-ghost{background:#fff;color:var(--text-2);border:1px solid #C9D5E3}
.btn-ghost:hover{border-color:var(--primary);color:var(--primary)}
.btn-plain{background:transparent;color:var(--primary);border:1px solid var(--primary)}
.btn-plain:hover{background:var(--primary-soft)}

/* ======================== Header ======================== */
.site-header{position:sticky;top:0;z-index:1000;background:#fff;border-bottom:1px solid var(--border);transition:box-shadow .2s var(--ease),background .2s var(--ease)}
.site-header.is-scrolled{background:rgba(255,255,255,.92);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);box-shadow:0 4px 20px rgba(16,32,51,.06)}
.header-inner{display:flex;align-items:center;height:72px;gap:24px}
.brand{display:flex;align-items:center;gap:10px;width:180px;flex-shrink:0}
.brand img{height:45px;width:auto}
.brand span{font-size:17px;font-weight:700;color:var(--text);white-space:nowrap}
.main-nav{flex:1;display:flex;align-items:center;justify-content:center;gap:28px}
.main-nav a,.nav-dropdown>button{display:inline-flex;align-items:center;gap:4px;font-size:16px;font-weight:600;color:var(--text-2);background:none;border:none;padding:6px 0;transition:color .16s var(--ease)}
.main-nav a:hover,.nav-dropdown>button:hover{color:var(--primary)}
.main-nav a.active{color:var(--primary);font-weight:600}
.nav-dropdown{position:relative}
.nav-dropdown>button svg{width:14px;height:14px;transition:transform .2s var(--ease)}
.nav-dropdown.open>button svg{transform:rotate(180deg)}
.dropdown-menu{position:absolute;top:calc(100% + 8px);left:50%;transform:translateX(-50%) translateY(6px);min-width:170px;background:#fff;border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:0 12px 32px rgba(16,32,51,.10);padding:6px;opacity:0;visibility:hidden;transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s}
.nav-dropdown.open .dropdown-menu,.nav-dropdown:hover .dropdown-menu,.nav-dropdown:focus-within .dropdown-menu{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
.dropdown-menu a{display:block;padding:9px 12px;border-radius:6px;font-size:14px;color:var(--text-2)}
.dropdown-menu a:hover{background:var(--primary-soft);color:var(--primary)}
.header-cta{height:40px;padding:0 18px;font-size:14px;flex-shrink:0}
.mobile-menu-btn{display:none;width:40px;height:40px;border:1px solid var(--border);border-radius:var(--radius-sm);background:#fff;color:var(--text);align-items:center;justify-content:center}
.mobile-menu-btn svg{width:20px;height:20px}

/* ======================== Hero：四业务轮播（整屏横滑：背景随 slide 一起切换） ======================== */
.hero{position:relative;overflow:hidden;background:#030C29;color:#fff}
/* 上下留白原来在 .hero 的 padding 上，现挪进 slide 自身（见下），
   这样 slide 元素就是整个首屏的高度，背景（网格+光晕）能铺满到顶到底 */
.hero-viewport{position:relative;min-height:620px} /* 降级模式：内容 500 + slide 上下留白 120 */
/* 背景不再单独分层交叉淡入，而是直接铺在每张 slide 上：
   文字、配图、背景作为一个整体左右滑动（Swiper 加载失败时降级为原地淡入淡出） */
.hero-slide{position:absolute;inset:0;opacity:0;visibility:hidden;transition:opacity .55s var(--ease),visibility .55s;--accent:#7dd3fc;
  padding:50px 0 70px;
  background-color:var(--primary);
  --glow:radial-gradient(900px 520px at 72% 24%,rgba(22,119,255,.15),transparent 70%);
  background-image:
    repeating-linear-gradient(0deg,rgba(120,170,255,.2) 0 1px,transparent 1px 56px),
    repeating-linear-gradient(90deg,rgba(120,170,255,.2) 0 1px,transparent 1px 56px),
    var(--glow);
  background-size:56px 56px,56px 56px,auto}
.hero-slide.is-active{opacity:1;visibility:visible}
.hero-slide.s1{--glow:radial-gradient(900px 520px at 72% 24%,rgba(22,119,255,.18),transparent 70%)}
.hero-slide.s3{--glow:radial-gradient(900px 520px at 72% 24%,rgba(110,168,255,.16),transparent 70%)}
.hero-slide.s4{--glow:radial-gradient(900px 520px at 72% 24%,rgba(22,119,255,.14),transparent 70%)}
/* slide 通栏铺满后，内容宽度仍按 container 约束 */
.hero-inner{width:min(var(--container),calc(100% - 48px));margin:0 auto;display:grid;grid-template-columns:7fr 6fr;gap:56px;align-items:center;min-height:500px}
/* Swiper 接管首屏切换后：slide 回到文档流（水平滑动切换），透明度交由 Swiper 管理；上方规则仅作 Swiper 加载失败时的降级 */
.hero-viewport.swiper-initialized{min-height:0}
.hero-viewport.swiper-initialized .hero-slide{position:relative;inset:auto;opacity:1;visibility:visible;display:block}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;letter-spacing:.14em;color:#fff;margin-bottom:20px}
.eyebrow i{width:7px;height:7px;border-radius:50%;background:#fff;animation:blink 2.4s ease infinite}
@keyframes blink{0%,100%{opacity:1}50%{opacity:.35}}
.hero h1,.hero .hero-title{font-size:40px;line-height:1.22;font-weight:700;letter-spacing:-.015em;margin-bottom:16px;color:#fff}
.hero h1 span,.hero .hero-title span{color:#fff}
.hero-lead{font-size:15.5px;line-height:1.8;color:rgba(255,255,255,.55);margin-bottom:26px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-actions .btn{height:50px;padding:0 28px;font-size:16px}
/* 每屏按钮颜色跟随当前轮播主题色 */
.hero-slide .btn-primary{background:#fff;color:#1258C8}
.hero-slide .btn-primary:hover{background:#f0f6ff;color:#1258C8}
.hero-slide .btn-ghost{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.7)}
.hero-slide .btn-ghost:hover{border-color:#fff;color:#fff;background:rgba(255,255,255,.08)}

/* 数据格：按钮下方一行三格，细分隔线，数字跟随主题色 */
.hero-stats{display:flex;gap:20px;margin-top:24px;padding-top:16px;}
.hero-stat{flex:1;min-width:0}
.hero-stat .num{font-size:20px;font-weight:700;line-height:1.2;color:#fff;font-variant-numeric:tabular-nums}
.hero-stat .num .unit{font-size:13px;font-weight:600;margin-left:1px}
.hero-stat .label{font-size:11.5px;line-height:1.55;color:rgba(255,255,255,.55);margin-top:4px}

/* 右侧配图：边缘羽化渐隐，与通栏背景无缝融合（图片底色非纯色时也能隐形） */
.hero-media img{width:100%;height:auto;display:block;border-radius:var(--radius-md)}

/* 轮播箭头（深底配色） */
.hero-arrow{position:absolute;top:50%;transform:translateY(-50%);z-index:5;width:42px;height:42px;border-radius:50%;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2);color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:border-color .2s var(--ease),background .2s var(--ease)}
.hero-arrow:hover{border-color:rgba(255,255,255,.4);background:rgba(255,255,255,.18)}
.hero-arrow svg{width:18px;height:18px}
.hero-arrow.prev{left:14px}
.hero-arrow.next{right:14px}

/* 轮播圆点：底部居中（深底配色） */
.hero-dots{position:absolute;left:50%;bottom:34px;transform:translateX(-50%);z-index:5;display:flex;gap:10px}
.hero-dot{width:24px;height:5px;border-radius:99px;background:rgba(255,255,255,.25);border:none;cursor:pointer;padding:0;transition:background .25s var(--ease),width .25s var(--ease)}
.hero-dot:hover{background:rgba(255,255,255,.45)}
.hero-dot.is-active{background:#fff;width:38px}

/* ======================== 业务区：四卡分色（呼应首屏四色体系） ======================== */
.business-section{background:var(--bg)}
.business-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.business-card{position:relative;display:flex;flex-direction:column;background:#fff;border:1px solid var(--border);border-radius:var(--radius-md);overflow:hidden;transition:transform .22s var(--ease),border-color .22s var(--ease),box-shadow .22s var(--ease)}

.business-card::before{content:'';position:absolute;top:-1px;left:16px;right:16px;height:3px;border-radius:0 0 3px 3px;background:var(--bc);opacity:0;transition:opacity .22s var(--ease);z-index:2}
.business-card:hover::before{opacity:1}
.card-img{position:relative;aspect-ratio:4/3;overflow:hidden}
.card-img img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .3s var(--ease)}
.business-card:hover .card-img img{transform:scale(1.03)}
.card-img .price-badge{position:absolute;top:12px;right:12px;font-size:12.5px;font-weight:600;color:var(--white);background:var(--primary);backdrop-filter:blur(4px);border-radius:99px;padding:4px 10px;box-shadow:0 2px 8px rgba(15,35,60,.08)}
.card-body{padding:22px 24px 24px}
.card-number{font-size:12px;color:var(--muted-2);letter-spacing:.1em;margin-bottom:6px}
.business-card h3{font-size:19px;font-weight:600;margin-bottom:6px}
.card-slogan{font-size:14.5px;font-weight:600;color:var(--text);margin-bottom:6px}
.card-desc{font-size:13px;line-height:1.7;color:var(--muted);margin-bottom:14px}
.metric-list{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px}
.metric-list span{font-size:12.5px;color:var(--text-2);background:var(--bg);border:1px solid var(--border);border-radius:6px;padding:4px 10px}
.card-link{margin-top:auto;display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--primary)}
.card-link svg{width:16px;height:16px;transition:transform .18s var(--ease)}
.business-card:hover .card-link svg{transform:translateX(4px)}

/* ======================== GEO 服务区 ======================== */
.geo-section{background:#fff}
.stage-band{display:grid;grid-template-columns:300px 1fr;gap:24px;background:#fff;}
.stage-band + .stage-band{margin-top:20px}
.stage-info{position:relative;overflow:hidden;background:linear-gradient(150deg,var(--primary-soft) 0%,#F2F8FF 55%,#FBFDFF 100%);border:1px solid #DCE9FB;border-radius:var(--radius-md);padding:24px}
.stage-info::after{content:attr(data-no);position:absolute;right:10px;bottom:-16px;font-size:92px;font-weight:700;line-height:1;letter-spacing:-.02em;color:rgba(22,119,255,.14);pointer-events:none}
.stage-tag{position:relative;z-index:1;display:inline-block;font-size:12.5px;font-weight:600;color:var(--primary);background:#fff;border:1px solid #D6E6FC;border-radius:99px;padding:4px 14px;margin-bottom:14px}
.stage-info h3{position:relative;z-index:1;font-size:19px;font-weight:600;line-height:1.4;margin-bottom:8px}
.stage-intro{position:relative;z-index:1;font-size:13.5px;line-height:1.8;color:var(--muted)}
.stage-tasks{display:flex}
.stage-tasks .task-grid{flex:1}
.task-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.task-grid.cols-4{grid-template-columns:1.25fr .7fr .8fr 1.25fr}
.task-card{position:relative;overflow:hidden;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-md);padding:20px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease),background .2s var(--ease),transform .2s var(--ease)}
.task-card:hover{border-color:#BFD8FF;background:#fff}
.task-card b{display:flex;align-items:center;font-size:18px;font-weight:600;color:var(--text);margin-bottom:6px;position:relative;z-index:1}
.task-ico{position:absolute;right:-6px;bottom:-10px;width:64px;height:64px;color:var(--primary);opacity:.09;pointer-events:none;transition:opacity .2s var(--ease)}
.task-ico svg{width:100%;height:100%}
.task-card:hover .task-ico{opacity:.18}
.task-card p{font-size:15px;line-height:1.75;color:var(--text-2);position:relative;z-index:1}

/* 效果时间线：箭头形流水线 */
.geo-timeline{margin-top:44px}
.tl-track{display:flex;gap:6px}
.tl-seg{flex:1;background:var(--primary);padding:12px 30px;color:#fff;min-height:64px;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;clip-path:polygon(0 0,calc(100% - 16px) 0,100% 50%,calc(100% - 16px) 100%,0 100%,16px 50%)}
.tl-seg:first-child{clip-path:polygon(0 0,calc(100% - 16px) 0,100% 50%,calc(100% - 16px) 100%,0 100%)}
.tl-seg b{font-size:16px;font-weight:600}
.tl-seg span{font-size:16px;opacity:.85}
.tl-foot{display:flex;align-items:center;justify-content:space-between;margin-top:14px;font-size:13.5px;color:var(--muted)}
.tl-foot a{color:var(--primary);font-weight:600}
.tl-foot a:hover{text-decoration:underline;text-underline-offset:4px}

/* ======================== 关于我们：深蓝数字墙 ======================== */
.about-section{background:radial-gradient(ellipse 900px 600px at 100% 0%,rgba(7,20,38,.55) 0%,rgba(7,20,38,.25) 38%,rgba(7,20,38,0) 70%),url(../assets/images/about-bg-v2-draft.png) center/cover no-repeat;color:#fff}
.about-section .section-eyebrow{color:#6EA8FF}
.about-section .section-eyebrow::before{background:#4D9AFF}
.about-inner{display:grid;grid-template-columns:7fr 5fr;gap:64px;align-items:center}
.about-copy h2{margin-bottom:16px;color:#fff}
.about-lead{font-size:15.5px;line-height:1.85;color:rgba(255,255,255,.55);margin-bottom:22px}
.about-tags{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:26px}
.about-tags span{font-size:13px;color:#fff;background:rgba(22,119,255,.16);border:1px solid rgba(77,154,255,.28);border-radius:6px;padding:5px 14px}
.about-actions{display:flex;gap:12px;flex-wrap:wrap}
.about-actions .btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.4)}
.about-actions .btn-ghost:hover{border-color:#fff;color:#fff;background:rgba(255,255,255,.08)}
.about-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.stat-card{background:rgba(255,255,255,.045);border:1px solid rgba(255,255,255,.12);border-radius:14px;min-height:150px;padding:24px;display:flex;flex-direction:column;justify-content:center;transition:border-color .22s var(--ease),background .22s var(--ease)}
.stat-card:hover{border-color:rgba(77,154,255,.45);background:rgba(22,119,255,.10)}
.stat-num{font-size:40px;line-height:1;font-weight:700;background:linear-gradient(120deg,#8FC0FF,#4D9AFF);-webkit-background-clip:text;background-clip:text;font-variant-numeric:tabular-nums}
.stat-num small{font-size:14px;font-weight:600;color:#fff;margin-left:4px;-webkit-text-fill-color:#fff}
.stat-card p{font-size:13px;color:rgba(255,255,255,.55);margin-top:12px}
.stat-card p a:hover{color:#8FC0FF;text-decoration:underline;text-underline-offset:4px}
.about-section .btn-plain{background:transparent;color:#fff;border-color:rgba(255,255,255,.4)}
.about-section .btn-plain:hover{border-color:#fff;color:#fff;background:rgba(255,255,255,.08)}

/* ======================== 案例区 ======================== */
.cases-section{background:var(--bg)}
.case-tabs{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:28px}
.case-tab{border:1px solid var(--border);background:#fff;color:var(--text-2);border-radius:99px;font-size:14px;font-weight:500;padding:8px 20px;transition:all .18s var(--ease)}
.case-tab:hover{border-color:#BFD8FF;color:var(--primary)}
.case-tab.active{background:var(--primary);border-color:var(--primary);color:#fff}
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.case-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius-md);overflow:hidden;transition:border-color .22s var(--ease)}
.case-thumb{aspect-ratio:16/9;display:flex;flex-direction:column;overflow:hidden;background:#EDF2F8}
.case-thumb::before{content:'';flex:none;height:20px;background-color:var(--bg);background-image:radial-gradient(circle at 10px 10px,var(--muted-2) 0 2px,transparent 2.5px),radial-gradient(circle at 21px 10px,var(--muted-2) 0 2px,transparent 2.5px),radial-gradient(circle at 32px 10px,var(--muted-2) 0 2px,transparent 2.5px);background-repeat:no-repeat;border-bottom:1px solid var(--border)}
.case-thumb img{display:block;flex:1;min-height:0;width:100%;height:auto;object-fit:cover;transition:transform .3s var(--ease)}
.case-card:hover .case-thumb img{transform:scale(1.03)}
/* 无真实图时的浏览器骨架占位 */
.case-thumb.skeleton{display:flex;align-items:center;justify-content:center;padding:20px}
.browser{width:100%;height:100%;background:#fff;border:1px solid var(--border);border-radius:10px;overflow:hidden;display:flex;flex-direction:column}
.browser .bar{display:flex;align-items:center;gap:5px;padding:8px 10px;background:var(--bg);border-bottom:1px solid var(--border)}
.browser .bar i{width:8px;height:8px;border-radius:50%;background:#D5DEE9}
.browser .bar .addr{flex:1;height:10px;border-radius:5px;background:#E9EFF6;margin-left:6px}
.browser .shot{flex:1;padding:14px;display:flex;flex-direction:column;gap:8px}
.browser .shot i{height:9px;border-radius:5px;background:#E9EFF6}
.browser .shot i.w60{width:60%}
.browser .shot i.w40{width:40%}
.browser .shot i.accent{width:35%;height:16px;background:var(--primary-soft)}
.case-body{padding:22px}
.case-badge{display:inline-block;font-size:12.5px;font-weight:600;color:var(--primary);background:var(--primary-soft);border-radius:6px;padding:3px 10px;margin-bottom:12px}
.case-card h3{font-size:18px;font-weight:600;margin-bottom:8px}
.case-card p{font-size:14px;line-height:1.7;color:var(--muted)}

/* ======================== 推广案例：AI Answer ======================== */
.promotion-section{position:relative;background:radial-gradient(ellipse 800px 500px at 0% 0%,rgba(7,20,38,.55) 0%,rgba(7,20,38,.25) 38%,rgba(7,20,38,0) 70%),radial-gradient(ellipse 800px 500px at 100% 100%,rgba(7,20,38,.55) 0%,rgba(7,20,38,.25) 38%,rgba(7,20,38,0) 70%),url(../assets/images/promotion-bg-v1-draft.png) center/cover no-repeat}
.promotion-section::before{content:'';position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);background-size:46px 46px;pointer-events:none}
.promotion-section>.container{position:relative;z-index:1}
.promo-tabs{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:32px}
.promo-tab{display:inline-flex;align-items:center;gap:10px;border:1px solid rgba(255,255,255,.22);background:rgba(255,255,255,.06);color:#A9BFD9;border-radius:99px;font-size:14px;font-weight:500;padding:9px 20px;transition:all .18s var(--ease)}
.promo-tab span{font-size:12px;font-weight:700;opacity:.65}
.promo-tab:hover{border-color:rgba(255,255,255,.5);color:#fff}
.promo-tab.active{background:var(--primary);border-color:var(--primary);color:#fff}
.promo-layout{display:grid;grid-template-columns:5fr 7fr;gap:28px;align-items:stretch}

/* 左列：AI 答案实测截图（白色卡片，与右侧文字卡同高） */
.promo-shots{display:flex;flex-direction:column;background:#fff;border-radius:var(--radius-lg);padding:20px 20px 14px;color:var(--text)}
.promo-shot{display:none}
@keyframes panelIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.promo-shot.active{display:block;animation:panelIn .3s var(--ease)}
.promo-shot img{width:100%;border-radius:8px;border:1px solid var(--border)}
.shot-note{font-size:12.5px;color:var(--muted);margin-top:auto;padding-top:12px;border-top:1px dashed var(--border);line-height:1.7}

/* 右列：AI 回答文字卡（高度跟随左侧截图） */
.promo-answer-stack{position:relative;display:flex;flex-direction:column;height:100%}
.promo-answer{display:none;flex-direction:column;background:#fff;border-radius:var(--radius-lg);padding:24px 28px;color:var(--text)}
.promo-answer.active{display:flex;height:100%;animation:panelIn .3s var(--ease)}
.answer-head{display:flex;align-items:center;gap:12px;padding-bottom:14px;border-bottom:1px solid var(--border)}
.answer-head .dots{display:inline-flex;gap:5px}
.answer-head .dots i{width:8px;height:8px;border-radius:50%;background:#D5DEE9}
.answer-head b{font-size:14.5px;font-weight:700;color:var(--text-2)}
.answer-body{padding:18px 0 14px;flex:1}
.answer-body p{font-size:15.5px;line-height:1.9;color:var(--text-2)}
.answer-body mark{background:var(--primary-soft);color:var(--primary);font-weight:700;padding:1px 4px;border-radius:4px}
.answer-tags{display:flex;flex-wrap:wrap;gap:8px;padding-bottom:16px}
.answer-tags span{font-size:12.5px;color:var(--text-2);background:var(--bg);border:1px solid var(--border);border-radius:6px;padding:4px 12px}
.answer-foot{font-size:12.5px;color:var(--muted-2);text-align:right;border-top:1px dashed var(--border);padding-top:12px;margin-top:auto}

/* ======================== 为什么选择启凡 ======================== */
.trust-section{background:var(--bg)}
.trust-group-head{display:flex;align-items:center;gap:10px;margin-bottom:20px}
.trust-group-head b{font-size:17px;font-weight:600;color:var(--text)}
.trust-group-head small{font-size:13px;color:var(--muted-2)}
.trust-group-head::after{content:'';flex:1;height:1px;background:var(--border)}
.trust-list + .trust-group-head{margin-top:48px}
/* 交付保障组（6 项）：双列紧凑横卡，全部直接铺开展示，不做轮播 */
.trust-list{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.trust-card.trust-row{flex-direction:row;align-items:stretch}
.trust-row .trust-img{width:150px;aspect-ratio:auto;flex:none}
.trust-row .trust-txt{flex:1;min-width:0;padding:16px 18px}
.trust-card{display:flex;flex-direction:column;background:#fff;border:1px solid var(--border);border-radius:var(--radius-md);overflow:hidden;transition:transform .22s var(--ease),border-color .22s var(--ease),box-shadow .22s var(--ease)}
/* 版权合规组（3 项）：静态三列网格，不做轮播 */
.trust-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.trust-card:hover{border-color:#BFD8FF}
.trust-img{aspect-ratio:16/10;overflow:hidden;background:#DCE4F2}
.trust-img img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .3s var(--ease)}
.trust-card:hover .trust-img img{transform:scale(1.03)}
.trust-txt{padding:20px 22px 22px}
.trust-txt h3{font-size:16.5px;font-weight:600;display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:6px}
.trust-tag{font-size:12px;font-weight:500;color:var(--muted);background:var(--bg);border:1px solid var(--border);border-radius:99px;padding:2px 10px}
.trust-txt p{font-size:13.5px;line-height:1.8;color:var(--muted)}

/* ======================== 新闻区：上图下文卡 ======================== */
.news-section{background:#fff}
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news-card{display:flex;flex-direction:column;overflow:hidden;background:#fff;border:1px solid var(--border);border-radius:var(--radius-md);transition:transform .22s var(--ease),border-color .22s var(--ease),box-shadow .22s var(--ease)}
.news-card:hover{border-color:#BFD8FF}
.news-thumb{width:100%;aspect-ratio:16/9;overflow:hidden}
.news-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .35s var(--ease)}
.news-card:hover .news-thumb img{transform:scale(1.05)}
.news-body{position:relative;flex:1;display:flex;flex-direction:column;padding:20px 44px 20px 22px}
.news-meta{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.news-meta time{font-size:13px;color:var(--muted-2);font-variant-numeric:tabular-nums}
.news-badge{font-size:12px;font-weight:600;color:var(--primary);background:var(--primary-soft);border-radius:6px;padding:2px 10px}
.news-body h3{font-size:16.5px;font-weight:600;line-height:1.5;margin-bottom:7px}
.news-body p{font-size:13px;line-height:1.65;color:var(--muted)}
.news-arrow{position:absolute;right:18px;top:50%;transform:translateY(-50%);width:20px;height:20px;color:var(--muted-2);transition:color .18s var(--ease),transform .18s var(--ease)}
.news-card:hover .news-arrow{color:var(--primary);transform:translateY(-50%) translateX(3px)}

/* ======================== 最终 CTA ======================== */
.final-cta{background:url(../assets/images/cta-bg-v1-draft.png) center/cover no-repeat;color:#fff;padding:50px 0;position:relative;overflow:hidden}
.final-cta::before{content:'';position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.03) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.03) 1px,transparent 1px);background-size:48px 48px;pointer-events:none}
.cta-inner{position:relative;display:flex;align-items:center;justify-content:space-between;gap:32px;}
.final-cta h2{font-size:30px}

/* ======================== Footer（深蓝 + 网络纹理底图） ======================== */
.site-footer{background:linear-gradient(rgba(11,27,51,.72),rgba(11,27,51,.72)),url(../assets/gen/bg-network.jpg) center/cover no-repeat,var(--navy);color:#A9BFD9;padding:72px 0 0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.4fr;gap:48px;padding-bottom:52px}
.footer-col h4{font-size:15.5px;font-weight:600;color:#fff;margin-bottom:18px}
.footer-col p,.footer-col li{font-size:13.5px;line-height:2;margin-bottom:0}
.footer-col a:hover{color:#fff;text-decoration:underline;text-underline-offset:4px}
.footer-col .tel{color:#4D9AFF;font-weight:600}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;border-top:1px solid rgba(255,255,255,.10);padding:22px 0;font-size:12.5px;color:#6C84A3}
.footer-bottom a{color:#6C84A3}
.footer-bottom a:hover{color:#fff}

/* ======================== 进场动效（渐进增强） ======================== */
html.js .reveal:not(.in-view){opacity:0;transform:translateY(16px)}
.reveal{transition:opacity .6s var(--ease),transform .6s var(--ease)}

/* ======================== 响应式 ======================== */
@media (max-width:1199px){
  .business-grid{grid-template-columns:repeat(2,1fr)}
  .case-grid{grid-template-columns:repeat(2,1fr)}
  .case-card[data-category="guanwang"]{grid-column:span 2}
  .trust-grid{grid-template-columns:repeat(2,1fr)}
  .trust-row .trust-img{width:130px}
  .stage-band{grid-template-columns:260px 1fr}
  .task-grid.cols-4{grid-template-columns:repeat(2,1fr)}
  .hero h1,.hero .hero-title{font-size:42px}
  .hero-inner{grid-template-columns:1fr 1fr;gap:40px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:36px}
}
@media (max-width:768px){
  /* 移动端整体字号收小，排版更紧凑 */
  .section{padding:52px 0}
  h2{font-size:22px}
  .section-eyebrow{font-size:12px;margin-bottom:8px}
  .section-desc{font-size:13px}
  .section-head{flex-direction:column;align-items:flex-start;margin-bottom:28px}
  .section-desc{text-align:left}

  /* 头部改为固定定位：部分手机浏览器 sticky 支持不稳，fixed 始终吸顶 */
  body{padding-top:60px}
  body.nav-locked{overflow:hidden}
  .site-header{position:fixed;top:0;left:0;right:0}
  .header-inner{height:60px;gap:12px}
  .brand img{height:32px}
  .mobile-menu-btn{width:38px;height:38px}

  /* 导航菜单：全屏覆盖层，点击按钮后显示。
     注意：菜单在 fixed 的 header 内部，必须用 absolute（top:100% 从 header 底边起算），
     若用 fixed 会受 header 的 backdrop-filter 影响导致高度塌陷 */
  .main-nav{position:absolute;top:100%;left:0;right:0;height:calc(100vh - 60px);height:calc(100dvh - 60px);background:#fff;flex-direction:column;align-items:stretch;justify-content:flex-start;gap:0;padding:10px 24px 24px;overflow-y:auto;display:none;box-shadow:0 16px 32px rgba(16,32,51,.10)}
  @keyframes menuIn{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}
  .main-nav.menu-open{display:flex;animation:menuIn .22s var(--ease)}
  .main-nav a,.nav-dropdown>button{padding:13px 4px;font-size:15px;border-bottom:1px solid var(--border);width:100%;justify-content:space-between}
  .dropdown-menu{position:static;transform:none;opacity:1;visibility:visible;box-shadow:none;border:none;padding:0 0 8px 16px;display:none}
  .nav-dropdown.open .dropdown-menu{display:block}
  .header-cta{display:none}
  .mobile-menu-btn{display:inline-flex;margin-left:auto}
  .brand{width:auto}

  /* Hero 首屏（上下留白在 slide 上，背景才能铺满整个首屏） */
  .hero-viewport{min-height:0}
  .hero-slide{position:static;display:none;opacity:1;visibility:visible;padding:40px 0 76px}
  .hero-slide.is-active{display:block}
  .hero-inner{grid-template-columns:1fr;gap:32px;min-height:0}
  .eyebrow{font-size:12px;margin-bottom:14px}
  .hero h1,.hero .hero-title{font-size:25px}
  .hero-lead{font-size:14px;line-height:1.75;margin-bottom:20px}
  .hero-actions{gap:10px}
  .hero-actions .btn{height:44px;padding:0 20px;font-size:15px}
  .hero-stats{gap:12px;margin-top:20px;padding-top:14px}
  .hero-stat .num{font-size:18px}
  .hero-stat .num .unit{font-size:12px}
  .hero-stat .label{font-size:11px}
  .hero-media{aspect-ratio:16/9}
  .hero-arrow{display:none}
  .hero-dots{bottom:26px}

  /* 业务卡片区 */
  .business-grid{grid-template-columns:1fr}
  .business-card{min-height:0}
  .business-card h3{font-size:17px}
  .card-body{padding:18px 20px 20px}

  /* GEO 三阶段 */
  .stage-band{grid-template-columns:1fr;gap:12px;padding:12px}
  .stage-info{padding:18px}
  .stage-info h3{font-size:17px}
  .stage-intro{font-size:13px}
  .task-grid{grid-template-columns:1fr}
  .task-grid.cols-4{grid-template-columns:1fr}
  .task-card{padding:16px}
  .task-card b{font-size:16px}
  .task-card p{font-size:13.5px;line-height:1.7}
  .tl-track{flex-direction:column;gap:6px}
  .tl-track .tl-seg{clip-path:none;margin-left:0;border-radius:var(--radius-sm);padding:12px 18px;min-height:0;flex:none}
  .tl-seg b,.tl-seg span{font-size:14px}

  /* 关于我们 */
  .about-inner{grid-template-columns:1fr;gap:36px}
  .about-lead{font-size:14px}
  .stat-num{font-size:32px}
  .stat-card{min-height:110px;padding:18px}
  .stat-card p{font-size:12.5px}

  /* 案例区 */
  .case-grid{grid-template-columns:1fr}
  .case-card[data-category="guanwang"]{grid-column:auto}
  .case-card h3{font-size:17px}

  /* 推广案例 */
  .promo-layout{grid-template-columns:1fr}
  .answer-body p{font-size:14px}

  /* 为什么选择启凡 / 新闻 */
  .trust-grid{grid-template-columns:1fr;gap:16px}
  .trust-list{grid-template-columns:1fr;gap:12px}
  .trust-list + .trust-group-head{margin-top:36px}
  .trust-row .trust-img{width:110px}
  .trust-row .trust-txt{padding:14px 16px}
  .trust-txt h3{font-size:15.5px}
  .trust-txt p{font-size:13px}
  .news-grid{grid-template-columns:1fr}
  .news-body h3{font-size:15.5px}

  /* CTA 与页脚 */
  .cta-inner{flex-direction:column;align-items:flex-start;gap:20px}
  .final-cta h2{font-size:20px}
  .final-cta .btn-lg{height:46px;padding:0 24px;font-size:15px}
  .footer-grid{grid-template-columns:1fr;gap:26px}
  .footer-col h4{font-size:15px;margin-bottom:12px}
  .footer-col p,.footer-col li{font-size:13px}
  .footer-bottom{flex-direction:column;align-items:flex-start;font-size:12px}
}
@media (max-width:480px){
  .container{width:calc(100% - 32px)}
  .hero h1,.hero .hero-title{font-size:22px}
  .hero-stat .num{font-size:17px}
  .case-tabs,.promo-tabs{flex-wrap:nowrap;overflow-x:auto;padding-bottom:6px}
  .case-tab,.promo-tab{white-space:nowrap;flex-shrink:0}
}

/* ======================== 减少动画偏好 ======================== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  html.js .reveal{opacity:1;transform:none}
}