/* ============================================================
   遇见AI助手 · GEO优化营销站 —— 科技风格 / 响应式
   ============================================================ */
:root{
  --bg:#060a16; --bg2:#0a1120; --bg3:#0d1630;
  --card:rgba(20,32,64,.55);
  --line:rgba(99,140,255,.16);
  --blue:#3b82f6; --violet:#8b5cf6; --cyan:#22d3ee; --green:#34d399;
  --text:#e8eeff; --muted:#93a4c9;
  --grad:linear-gradient(100deg,var(--blue),var(--violet) 55%,var(--cyan));
  --radius:16px;
  --shadow:0 18px 50px rgba(2,8,30,.55);
}
*{margin:0;padding:0;box-sizing:border-box}
html,body{overflow-x:hidden}html{scroll-behavior:smooth;scroll-padding-top:84px}
body{font-family:"PingFang SC","Microsoft YaHei",-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.7;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.container{width:92%;max-width:1200px;margin:0 auto}
section{position:relative;padding:96px 0}
.sec-tag{display:inline-flex;align-items:center;gap:8px;font-size:13px;letter-spacing:2px;color:var(--cyan);border:1px solid rgba(34,211,238,.35);padding:6px 16px;border-radius:999px;background:rgba(34,211,238,.06)}
.sec-title{font-size:clamp(26px,4vw,42px);font-weight:800;margin:18px 0 12px;line-height:1.3;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.sec-sub{color:var(--muted);max-width:720px;margin:0 auto 48px;font-size:16px}
.sec-head{text-align:center;margin-bottom:24px}

/* 背景网格 + 光晕 */
.bg-grid{position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(rgba(99,140,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(99,140,255,.05) 1px,transparent 1px);background-size:56px 56px;-webkit-mask-image:radial-gradient(ellipse 90% 70% at 50% 30%,#000 40%,transparent 100%);mask-image:radial-gradient(ellipse 90% 70% at 50% 30%,#000 40%,transparent 100%)}
.glow{position:absolute;border-radius:50%;filter:blur(90px);pointer-events:none;opacity:.5}
.glow.blue{background:var(--blue);width:420px;height:420px}
.glow.violet{background:var(--violet);width:380px;height:380px}
.glow.cyan{background:var(--cyan);width:320px;height:320px;opacity:.25}

/* ================= 顶部导航 ================= */
.site-header{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(6,10,22,.82);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border-bottom:1px solid var(--line);transition:.3s}
.site-header.scrolled{box-shadow:0 10px 30px rgba(0,0,0,.4)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.logo{display:flex;align-items:center;gap:16px}
.logo-mark{width:40px;height:40px;border-radius:10px;background:var(--grad);display:grid;place-items:center;font-weight:900;font-size:15px;color:#fff;box-shadow:0 6px 18px rgba(59,130,246,.45)}
.logo-text{font-size:20px;font-weight:800;letter-spacing:1px;display:flex;flex-direction:column;gap:5px;line-height:1.15}
.logo-text i{font-style:normal;font-size:11px;font-weight:400;color:var(--muted);letter-spacing:0}
.main-nav{display:flex;gap:34px}
.main-nav a{font-size:15px;color:var(--muted);transition:.25s;position:relative}
.main-nav a::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:2px;background:var(--grad);transition:.3s;border-radius:2px}
.main-nav a:hover,.main-nav a.active{color:#fff}
.main-nav a:hover::after,.main-nav a.active::after{width:100%}
.header-actions{display:flex;align-items:center;gap:14px}
.btn-phone{font-weight:700;color:var(--cyan);font-size:15px}
.btn-consult{background:var(--grad);color:#fff;padding:9px 22px;border-radius:999px;font-weight:700;font-size:14px;box-shadow:0 8px 22px rgba(99,102,241,.4);transition:.3s}
.btn-consult:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(99,102,241,.55)}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;flex-direction:column;gap:5px;padding:6px}
.nav-toggle span{width:26px;height:2px;background:#fff;border-radius:2px;transition:.3s}
.nav-mask{display:none;position:fixed;inset:0;background:rgba(0,0,0,.6);z-index:98;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}

/* ================= Hero（3 套 banner 轮播） ================= */
.hero{position:relative;padding-top:120px;padding-bottom:60px;overflow:hidden}
.hero .bg-grid{background-size:64px 64px}
.hero .glow.blue{top:-140px;left:-120px}.hero .glow.violet{top:20%;right:-160px}.hero .glow.cyan{bottom:-120px;left:30%}
.hero-banner{position:relative;display:grid;min-height:calc(100vh - 240px);align-content:center;padding-bottom:34px}
.hero-slide{grid-area:1/1;width:100%;opacity:0;visibility:hidden;transform:translateY(14px);transition:.55s ease}
.hero-slide.active{opacity:1;visibility:visible;transform:none;z-index:2}
.hero-grid{position:relative;z-index:2;display:grid;grid-template-columns:1.15fr .85fr;gap:60px;align-items:center}
.hero-badge{display:inline-flex;align-items:center;gap:8px;font-size:13px;padding:7px 16px;border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.04);color:var(--cyan);margin-bottom:22px}
.hero h1{font-size:clamp(32px,5vw,58px);font-weight:900;line-height:1.22;margin-bottom:20px}
.hero h1 .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero p.lead{font-size:18px;color:var(--muted);margin-bottom:30px;max-width:560px}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 34px;border-radius:999px;font-weight:700;font-size:16px;transition:.3s;border:0;cursor:pointer}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 10px 30px rgba(99,102,241,.45)}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 16px 40px rgba(99,102,241,.6)}
.btn-ghost{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.25)}
.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn-block{width:100%}
.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:36px;position:relative;z-index:3}
.stat-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px 14px;text-align:center;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}
.stat-card b{display:block;font-size:clamp(22px,3vw,34px);font-weight:900;color:var(--blue);background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.stat-card span{font-size:13px;color:var(--muted)}

/* Hero 右侧 AI 对话卡（每套 banner 一组，跟随切换） */
.demo-card{background:linear-gradient(160deg,#0e1834,#0a1226);border:1px solid var(--line);border-radius:20px;padding:22px 20px 24px;box-shadow:var(--shadow);max-width:470px;margin-left:auto;animation:sceneIn .55s ease both}
.demo-head{display:flex;align-items:center;gap:10px;margin-bottom:16px;font-weight:700;font-size:15px;color:#fff}
.demo-head .demo-ic{width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,rgba(34,211,238,.4),rgba(99,102,241,.4));display:grid;place-items:center;font-size:14px;border:1px solid rgba(255,255,255,.18)}
.chat{display:flex;flex-direction:column;gap:12px}
.bubble{max-width:88%;padding:11px 14px;border-radius:14px;font-size:14px;animation:rise .6s both}
.bubble.user{align-self:flex-end;background:var(--grad);color:#fff;border-bottom-right-radius:4px}
.bubble.ai{align-self:flex-start;background:rgba(255,255,255,.07);border:1px solid var(--line);border-bottom-left-radius:4px}
.bubble.ai b{color:var(--cyan)}
.bubble.ai .tag{display:inline-block;margin-top:6px;padding:3px 10px;border-radius:999px;background:rgba(52,211,153,.15);color:var(--green);font-size:12px}

/* Banner 轮播指示器 */
.banner-dots{position:absolute;left:50%;bottom:0;transform:translateX(-50%);display:flex;gap:10px;z-index:5}
.banner-dots .dot{width:10px;height:10px;border-radius:50%;border:1px solid rgba(255,255,255,.3);background:rgba(255,255,255,.12);cursor:pointer;padding:0;transition:.3s}
.banner-dots .dot:hover{background:rgba(255,255,255,.35)}
.banner-dots .dot.active{width:32px;border-radius:6px;background:var(--grad);border-color:transparent}

/* 浮动标签（hero 对角：右上 chip-1 + 左下 chip-2） */
.float-chip{position:absolute;background:var(--card);border:1px solid var(--line);padding:10px 16px;border-radius:12px;font-size:13px;box-shadow:var(--shadow);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);white-space:nowrap;z-index:4}
.float-chip.chip-1{top:170px;right:230px;color:var(--cyan);animation:float 4s ease-in-out infinite}
.float-chip.chip-2{bottom:340px;left:780px;color:var(--green);animation:float 4s 1s ease-in-out infinite}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}
@keyframes rise{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
@keyframes sceneIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}

/* ================= 平台 LOGO 条 ================= */
.platforms{padding:40px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.platforms .sec-sub{margin-bottom:24px}
.platform-list{display:flex;flex-wrap:wrap;justify-content:center;gap:16px}
.platform-item{display:flex;align-items:center;gap:10px;padding:12px 22px;border:1px solid var(--line);border-radius:12px;background:rgba(255,255,255,.03);font-weight:600;font-size:15px;transition:.3s}
.platform-item:hover{border-color:var(--cyan);transform:translateY(-3px)}
.platform-item em{font-style:normal;font-size:12px;color:var(--green);font-weight:400}

/* ================= 通用卡片 ================= */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);transition:.35s;position:relative;overflow:hidden}
.card::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--grad);transform:scaleX(0);transform-origin:left;transition:.4s}
.card:hover{transform:translateY(-6px);border-color:rgba(99,140,255,.45);box-shadow:var(--shadow)}
.card:hover::before{transform:scaleX(1)}
.card .icon{width:56px;height:56px;border-radius:14px;background:rgba(99,102,241,.14);display:grid;place-items:center;font-size:26px;margin-bottom:18px}
.card h3{font-size:19px;margin-bottom:10px}
.card p{color:var(--muted);font-size:14.5px}

/* ================= 困境 ================= */
.pain{background:var(--bg2)}
.pain-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.pain-card{position:relative;padding:34px 28px;border-radius:var(--radius);background:linear-gradient(160deg,rgba(255,255,255,.04),transparent);border:1px solid var(--line);transition:.3s}
.pain-card:hover{border-color:rgba(255,95,87,.5);transform:translateY(-5px)}
.pain-card .num{position:absolute;top:18px;right:22px;font-size:46px;font-weight:900;color:rgba(255,255,255,.06)}
.pain-card h3{font-size:20px;margin-bottom:14px;color:#ff8f87}
.pain-card ul{list-style:none}
.pain-card li{padding:7px 0 7px 22px;position:relative;color:var(--muted);font-size:14.5px}
.pain-card li::before{content:"▸";position:absolute;left:0;color:#ff8f87}

/* ================= 时间线 ================= */
.timeline{position:relative;max-width:980px;margin:0 auto}
.timeline::before{content:"";position:absolute;left:50%;top:0;bottom:0;width:2px;background:linear-gradient(180deg,var(--blue),var(--violet),var(--cyan));transform:translateX(-50%)}
.tl-item{position:relative;width:50%;padding:0 46px 56px}
.tl-item:nth-child(odd){left:0;text-align:right}
.tl-item:nth-child(even){left:50%}
.tl-dot{position:absolute;top:6px;width:16px;height:16px;border-radius:50%;background:var(--bg);border:4px solid var(--cyan);box-shadow:0 0 0 6px rgba(34,211,238,.15)}
.tl-item:nth-child(odd) .tl-dot{right:-8px}
.tl-item:nth-child(even) .tl-dot{left:-8px}
.tl-year{display:inline-block;font-size:13px;color:var(--cyan);border:1px solid rgba(34,211,238,.4);padding:3px 14px;border-radius:999px;margin-bottom:12px;background:rgba(34,211,238,.06)}
.tl-item h3{font-size:20px;margin-bottom:8px}
.tl-item p{color:var(--muted);font-size:14.5px}

/* ================= GEO vs SEO ================= */
.compare{background:var(--bg2)}
.compare-grid{display:grid;grid-template-columns:1fr auto 1fr;gap:0;align-items:stretch}
.compare-col{padding:36px 30px;border:1px solid var(--line);border-radius:var(--radius)}
.compare-col.seo{background:linear-gradient(160deg,rgba(148,163,184,.08),transparent)}
.compare-col.geo{background:linear-gradient(160deg,rgba(59,130,246,.14),rgba(139,92,246,.1));border-color:rgba(99,140,255,.4);position:relative}
.compare-col.geo::before{content:"推荐";position:absolute;top:18px;right:20px;font-size:12px;color:#fff;background:var(--grad);padding:3px 12px;border-radius:999px}
.compare-col h3{font-size:22px;margin-bottom:20px;display:flex;align-items:center;gap:10px}
.compare-col ul{list-style:none}
.compare-col li{padding:10px 0 10px 28px;position:relative;color:var(--muted);font-size:15px;border-bottom:1px dashed rgba(255,255,255,.08)}
.compare-col li::before{content:"✕";position:absolute;left:0;color:#94a3b8}
.compare-col.geo li::before{content:"✓";color:var(--green)}
.compare-vs{display:grid;place-items:center;font-size:26px;font-weight:900;color:var(--cyan);padding:0 26px;text-shadow:0 0 30px rgba(34,211,238,.6)}

/* ================= 服务 ================= */
.services .card .icon i{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.services-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.services-grid .wide-card{grid-column:1/-1}
.services-grid .wide-card .service-list{display:grid;grid-template-columns:repeat(3,1fr);gap:0 22px}
.service-list{margin-top:14px;list-style:none}
.service-list li{padding:6px 0 6px 22px;position:relative;color:var(--muted);font-size:14px}
.service-list li::before{content:"→";position:absolute;left:0;color:var(--cyan)}
.svc-platforms{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.svc-platforms span{font-size:12px;padding:4px 12px;border:1px solid var(--line);border-radius:999px;color:var(--muted)}

/* ================= 技术引擎 ================= */
.engines{background:var(--bg2)}
.engines-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
/* 技术引擎：所有宽度都用横版（图标左、标题中、描述右） */
.engines-grid .card{display:flex;align-items:center;gap:14px;padding:18px 20px}
.engines-grid .card .engine-num{flex:0 0 auto;font-size:30px;line-height:1;margin:0}
.engines-grid .card h3{flex:0 0 auto;font-size:15px;margin:0;white-space:nowrap}
.engines-grid .card p{flex:1;min-width:0;font-size:12.5px;line-height:1.5;margin:0;color:var(--muted)}
.engines-grid .card .engine-bar{display:none}
/* 核心价值：所有宽度都用横版（PC 端 3 列 + 每张卡横版） */
.value-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.value-grid .card{display:flex;align-items:flex-start;gap:14px;padding:18px 20px;text-align:left}
.value-grid .card .icon{flex:0 0 auto;width:48px;height:48px;border-radius:12px;font-size:22px;margin:0;display:grid;place-items:center}
.value-grid .card h3{flex:0 0 auto;font-size:16px;margin:0 0 6px;white-space:nowrap}
.value-grid .card p{flex:1;min-width:0;font-size:13px;line-height:1.5;margin:0;color:var(--muted)}
.engine-num{font-size:44px;font-weight:900;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;opacity:.9}
.engine-bar{height:6px;border-radius:3px;background:rgba(255,255,255,.08);margin:14px 0;overflow:hidden}
.engine-bar i{display:block;height:100%;border-radius:3px;background:var(--grad);animation:grow 1.6s ease both}
@keyframes grow{from{width:0}}

/* ================= 流程 ================= */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.step{text-align:center;position:relative;padding:0 8px}
.step::after{content:"→";position:absolute;top:44px;right:-14px;color:rgba(255,255,255,.2);font-size:22px}
.step:last-child::after{display:none}
.step-num{width:88px;height:88px;margin:0 auto 18px;border-radius:24px;background:linear-gradient(160deg,rgba(59,130,246,.18),rgba(139,92,246,.12));border:1px solid var(--line);display:grid;place-items:center;font-size:34px;font-weight:900;color:var(--cyan);transition:.35s}
.step:hover .step-num{transform:rotate(-6deg) scale(1.06);box-shadow:0 0 40px rgba(34,211,238,.25)}
.step h3{font-size:18px;margin-bottom:8px}
.step p{color:var(--muted);font-size:13.5px}

/* ================= 保障 ================= */
.guarantee{background:var(--bg2)}
.guarantee-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.g-item{display:flex;gap:14px;padding:22px;border:1px solid var(--line);border-radius:var(--radius);background:rgba(255,255,255,.03)}
.g-item .g-ic{flex:0 0 44px;height:44px;border-radius:12px;background:rgba(52,211,153,.14);display:grid;place-items:center;font-size:20px}
.g-item h4{font-size:16px;margin-bottom:6px}
.g-item p{color:var(--muted);font-size:13.5px}

/* ================= 行业 ================= */
.industry{background:var(--bg2)}
.industry-tags{display:flex;flex-wrap:wrap;justify-content:center;gap:14px;max-width:960px;margin:0 auto}
.ind-tag{padding:14px 28px;border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.03);font-size:15px;transition:.3s;cursor:default}
.ind-tag:hover{border-color:var(--cyan);color:var(--cyan);transform:translateY(-3px);box-shadow:0 10px 26px rgba(34,211,238,.15)}
.ind-tag b{color:var(--green);margin-left:6px;font-size:12px;font-weight:400}

/* ================= 案例 ================= */
.case-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-bottom:40px}
.case-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px 22px;text-align:center}
.case-card b{font-size:34px;font-weight:900;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.case-card span{font-size:14px;color:var(--muted)}
.case-quotes{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.quote{border-left:3px solid;padding:18px 22px;background:rgba(255,255,255,.03);border-radius:0 12px 12px 0;border-color:var(--cyan)}
.quote p{font-size:14.5px;color:var(--muted);margin-bottom:10px}
.quote cite{font-style:normal;font-size:13px;color:var(--cyan)}

/* ================= 关于 ================= */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.about-list{list-style:none;margin-top:20px}
.about-list li{padding:8px 0;color:var(--muted);font-size:15px;display:flex;gap:10px;align-items:flex-start}
.about-list li::before{content:"✦";color:var(--cyan);flex:0 0 auto}
.about-panel{background:linear-gradient(160deg,#0e1a3a,#0a1120);border:1px solid var(--line);border-radius:24px;padding:34px;position:relative;overflow:hidden}
.about-panel h3{font-size:22px;margin-bottom:18px}
.about-panel .rows{display:grid;gap:12px}
.about-panel .row{display:flex;justify-content:space-between;padding:12px 0;border-bottom:1px dashed rgba(255,255,255,.1);font-size:15px}
.about-panel .row span{color:var(--muted)}
.about-panel .row b{color:var(--cyan)}
.partners{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.partners span{padding:6px 16px;border:1px solid var(--line);border-radius:999px;font-size:13px;color:var(--muted)}

/* ================= 合作咨询 CTA ================= */
.contact{background:var(--bg2);overflow:hidden}
.contact-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:60px;align-items:start}
.contact-info h2{font-size:clamp(24px,3.5vw,36px);font-weight:800;margin-bottom:16px;line-height:1.3}
.contact-info p{color:var(--muted);margin-bottom:26px}
.contact-item{display:flex;align-items:center;gap:14px;padding:14px 0;border-bottom:1px dashed rgba(255,255,255,.1);font-size:16px}
.contact-item .ci{width:44px;height:44px;flex:0 0 44px;border-radius:12px;background:rgba(99,102,241,.14);display:grid;place-items:center;font-size:20px}
.contact-item b{display:block;font-size:18px;color:var(--cyan)}
.contact-item span{color:var(--muted);font-size:13px}
.contact-form{background:var(--card);border:1px solid var(--line);border-radius:24px;padding:36px;-webkit-backdrop-filter:blur(10px);box-shadow:var(--shadow)}
.contact-form h3{font-size:24px;margin-bottom:6px}
.contact-form .sub{color:var(--muted);font-size:14px;margin-bottom:24px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
input,select,textarea{width:100%;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.14);border-radius:12px;color:var(--text);padding:13px 16px;font-size:15px;font-family:inherit;outline:none;transition:.25s;margin-bottom:14px}
input:focus,select:focus,textarea:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(59,130,246,.18);background:rgba(255,255,255,.07)}
select option{background:#0a1120;color:#fff}
textarea{resize:vertical;min-height:96px}
.form-tip{font-size:13px;min-height:20px;margin-top:6px}
.form-tip.ok{color:var(--green)}
.form-tip.err{color:#ff8f87}
.form-note{font-size:12px;color:var(--muted);text-align:center;margin-top:8px}
.wechat-row{display:flex;gap:20px;align-items:center;margin-top:26px;padding-top:22px;border-top:1px dashed rgba(255,255,255,.12)}
.wechat-row img{width:120px;height:120px;border-radius:12px;border:1px solid var(--line)}
.wechat-row p{color:var(--muted);font-size:13.5px;margin:0}
.wechat-row b{color:var(--cyan)}

/* ================= 弹窗 ================= */
.modal{display:none;position:fixed;inset:0;z-index:200;background:rgba(3,6,16,.72);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);align-items:center;justify-content:center;padding:20px}
.modal.show{display:flex;animation:fadeIn .3s both}
.modal-box{background:linear-gradient(165deg,#101c3c,#0a1120);border:1px solid var(--line);border-radius:22px;padding:34px;width:100%;max-width:540px;max-height:92vh;overflow:auto;position:relative;box-shadow:var(--shadow)}
.modal-box h3{font-size:24px;margin-bottom:4px}
.modal-sub{color:var(--muted);font-size:14px;margin-bottom:22px}
.modal-close{position:absolute;top:16px;right:18px;background:none;border:0;color:var(--muted);font-size:28px;cursor:pointer;line-height:1}
.modal-close:hover{color:#fff}
.modal-alt{display:flex;gap:18px;justify-content:center;font-size:14px;color:var(--muted);margin-top:8px;flex-wrap:wrap}
.modal-alt a{color:var(--cyan);font-weight:600}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}

/* ================= 悬浮咨询条 ================= */
.float-bar{position:fixed;left:0;right:0;bottom:0;z-index:90;display:none;grid-template-columns:1fr 1fr;box-shadow:0 -6px 24px rgba(0,0,0,.4)}
.float-btn{padding:15px;text-align:center;font-weight:700;font-size:16px;color:#fff}
.float-phone{background:#1c2b52;border-right:1px solid rgba(255,255,255,.12)}
.float-wx{background:var(--grad)}

/* ================= 返回顶部 ================= */
.back-top{position:fixed;right:22px;bottom:26px;z-index:95;width:46px;height:46px;border-radius:14px;border:1px solid var(--line);background:var(--card);color:var(--cyan);font-size:22px;line-height:1;cursor:pointer;box-shadow:var(--shadow);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);opacity:0;visibility:hidden;transform:translateY(12px);transition:.3s}
.back-top.show{opacity:1;visibility:visible;transform:none}
.back-top:hover{background:var(--grad);color:#fff;border-color:transparent;transform:translateY(-3px)}

/* ================= 微信引导页 ================= */
.wx-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:110px 20px 60px;position:relative;overflow:hidden}
.wx-card{position:relative;z-index:2;background:var(--card);border:1px solid var(--line);border-radius:28px;padding:44px 40px;text-align:center;max-width:460px;width:100%;box-shadow:var(--shadow);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}
.wx-card .wx-logo{width:74px;height:74px;margin:0 auto 18px;border-radius:20px;background:var(--grad);display:grid;place-items:center;font-size:36px;box-shadow:0 12px 34px rgba(99,102,241,.5)}
.wx-card h1{font-size:26px;margin-bottom:8px}
.wx-card .wx-sub{color:var(--muted);font-size:15px;margin-bottom:26px}
.wx-card img.qr{width:220px;height:220px;border-radius:16px;border:1px solid var(--line);margin-bottom:8px}
.wx-card .wx-id{font-size:14px;color:var(--muted);margin-bottom:24px}
.wx-card .wx-id b{color:var(--cyan)}
.wx-open{display:inline-flex;align-items:center;gap:10px;background:var(--grad);color:#fff;padding:14px 40px;border-radius:999px;font-weight:700;font-size:17px;box-shadow:0 10px 30px rgba(99,102,241,.45);transition:.3s}
.wx-open:hover{transform:translateY(-3px)}
.wx-card .wx-back{margin-top:18px;font-size:13px;color:var(--muted)}
.wx-card .wx-back a{color:var(--cyan)}
.wx-tips{text-align:left;margin-top:26px;padding-top:20px;border-top:1px dashed rgba(255,255,255,.12);font-size:13px;color:var(--muted)}
.wx-tips li{list-style:none;padding:4px 0 4px 20px;position:relative}
.wx-tips li::before{content:"①";position:absolute;left:0;color:var(--cyan);font-style:normal}
.wx-tips li:nth-child(2)::before{content:"②"}
.wx-tips li:nth-child(3)::before{content:"③"}

/* ================= 页脚 ================= */
.site-footer{border-top:1px solid var(--line);background:#050a14;padding:64px 0 0}
.footer-grid{display:grid;grid-template-columns:auto auto auto auto;gap:36px;padding-bottom:44px;justify-content:start}
.footer-logo{font-size:22px;font-weight:800;margin-bottom:14px;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.footer-col p{color:var(--muted);font-size:13.5px;margin-bottom:8px}
.footer-col a{display:block;color:var(--muted);font-size:14px;padding:5px 0;transition:.25s}
.footer-col a:hover{color:var(--cyan)}
.footer-col h4{font-size:16px;margin-bottom:12px}
.footer-tags{color:var(--muted);font-size:12.5px;line-height:2}
.footer-bottom{border-top:1px solid rgba(255,255,255,.07);padding:18px 0;margin-top:-20px}
.footer-bottom .container{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;color:var(--muted);font-size:12.5px}

/* 联系列：信息 + 二维码（桌面移动端通用横向布局） */
.footer-contact{display:flex;align-items:flex-start;gap:18px}
.footer-contact .fc-main{flex:1;min-width:0}
.footer-contact .fc-qr{flex:0 0 auto;display:block;text-align:center;text-decoration:none;color:var(--muted);transition:.25s;padding:0;margin-top:50px}
.footer-contact .fc-qr:hover{color:var(--cyan);transform:translateY(-2px)}
.footer-contact .fc-qr img.fc-qr-img{width:120px;height:120px;border-radius:8px;border:1px solid var(--line);background:#fff;padding:4px;display:block;-webkit-user-select:none;user-select:none;-webkit-touch-callout:default}
.footer-contact .fc-copy-btn{display:block;width:100%;margin-top:8px;padding:7px 6px;background:rgba(99,102,241,.14);border:1px solid var(--line);border-radius:8px;color:var(--cyan);font-size:12px;font-weight:600;cursor:pointer;transition:.25s;line-height:1.3;white-space:nowrap}
.footer-contact .fc-copy-btn:hover{background:rgba(99,102,241,.25);color:#fff;border-color:var(--cyan)}
.footer-contact .fc-copy-btn.copied{background:rgba(34,197,94,.22);color:var(--green);border-color:var(--green)}

/* ================= 滚动动画（无 JS 时默认可见，JS 启用后才隐藏待显） ================= */
.reveal{transition:opacity .7s ease,transform .7s ease}
html.js .reveal:not(.in){opacity:0;transform:translateY(34px)}
html.js .reveal.in{opacity:1;transform:none}
html.js .reveal.d1{transition-delay:.1s}
html.js .reveal.d2{transition-delay:.2s}
html.js .reveal.d3{transition-delay:.3s}

/* ================= 响应式 ================= */
@media (max-width:1024px){
  .float-chip{display:none}
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .hero-banner{min-height:auto;padding-bottom:30px}
  .demo-card{margin:0 auto;max-width:560px}
  .pain-grid,.engines-grid,.guarantee-grid{grid-template-columns:repeat(2,1fr)}
  .compare-grid{grid-template-columns:1fr}
  .compare-vs{transform:rotate(90deg);padding:18px 0}
  .about-grid,.contact-grid{grid-template-columns:1fr;gap:40px}
  .steps{grid-template-columns:repeat(2,1fr);gap:32px}
  .step::after{display:none}
  .case-quotes{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:768px){
  section{padding:72px 0}
  /* 头部更紧凑，避免按钮被挤换行 */
  .header-inner{height:60px;gap:10px}
  .logo{gap:10px}
  .logo-mark{width:34px;height:34px;font-size:13px}
  .logo-text{font-size:15px;letter-spacing:0}
  .logo-text i{font-size:10px;line-height:1.1}
  .header-actions{gap:10px}
  .btn-consult{padding:6px 14px;font-size:12px;white-space:nowrap}
  .main-nav{position:fixed;top:0;right:-300px;width:280px;height:100vh;background:#0a1120;flex-direction:column;gap:0;padding:90px 30px;transition:right .35s;z-index:99;border-left:1px solid var(--line)}
  .main-nav.open{right:0}
  .main-nav a{padding:16px 0;border-bottom:1px solid rgba(255,255,255,.08);font-size:17px}
  .nav-toggle{display:flex}
  .btn-phone{display:none}
  .hero{padding-top:110px}
  .hero-stats{grid-template-columns:repeat(2,1fr);margin-top:24px;gap:10px}
  .stat-card{padding:14px 10px}
  .float-chip{padding:8px 12px;font-size:12px}
  .float-chip.chip-1{top:auto;bottom:200px;right:14px}
  .float-chip.chip-2{display:none}
  .services-grid,.form-row{grid-template-columns:1fr}
  .pain-grid,.engines-grid,.guarantee-grid,.case-stats{grid-template-columns:1fr 1fr}
  .case-stats{grid-template-columns:1fr 1fr}
  .timeline::before{left:14px}
  .tl-item{width:100%;left:0!important;text-align:left!important;padding:0 0 44px 48px}
  .tl-item .tl-dot{left:6px!important;right:auto!important}
  .footer-grid{grid-template-columns:1fr}
  .float-bar{display:grid}
  .back-top{right:14px;bottom:84px}
  .contact-form{padding:26px 20px}
  .modal-box{padding:26px 20px}
  /* 移动端 footer 底部留白，避开底部悬浮条 */
  .site-footer{padding-bottom:80px}
  /* 移动端：服务、关于菜单内的链接横排成 1 行 */
  .footer-grid .footer-col:not(.footer-contact) a{display:inline-block;margin-right:14px;padding:2px 0;font-size:13px}
  /* ===== 手机端：所有卡片板块统一横版（不挤压文字） ===== */
  /* 技术引擎：移动端单列（横版样式继承 @media 外） */
  .engines-grid{grid-template-columns:1fr;gap:14px}
  /* 价值 / 核心服务：icon + 标题同行横排，其余在下面（不挤压） */
  .services-grid .card{display:grid;grid-template-columns:auto 1fr;column-gap:14px;padding:18px 18px;align-items:start}
  .services-grid .card .icon{grid-column:1;grid-row:1;width:48px;height:48px;border-radius:12px;font-size:22px;margin:0;display:grid;place-items:center}
  .services-grid .card h3{grid-column:2;grid-row:1;margin:0;font-size:16px;align-self:center}
  .services-grid .card p{grid-column:1/-1;grid-row:2;margin:0 0 8px;font-size:13px;line-height:1.5}
  .services-grid .card .service-list{grid-column:1/-1;grid-row:3;margin:0}
  .services-grid .card .service-list li{font-size:12.5px;padding:4px 0 4px 18px}
  .services-grid .card .svc-platforms{grid-column:1/-1;grid-row:4;margin-top:10px}
  .services-grid .wide-card .service-list{grid-template-columns:1fr;gap:0}
  /* value-grid 保持横版（覆盖上面 grid 规则） */
  .value-grid .card{display:flex;align-items:flex-start;gap:14px;padding:18px 20px;text-align:left}
  .value-grid .card .icon{flex:0 0 auto;width:48px;height:48px;border-radius:12px;font-size:22px;margin:0;display:grid;place-items:center}
  .value-grid .card h3{flex:0 0 auto;font-size:16px;margin:0 0 6px;white-space:nowrap}
  .value-grid .card p{flex:1;min-width:0;font-size:13px;line-height:1.5;margin:0}
  /* 困境：序号在左 */
  .pain-grid{grid-template-columns:1fr;gap:14px}
  .pain-card{display:block;padding:22px 24px;position:relative}
  .pain-card .num{position:absolute;top:14px;right:20px;font-size:40px;line-height:1;margin:0;color:rgba(255,255,255,.08)}
  .pain-card h3{font-size:18px;margin:0 0 12px;padding-right:56px}
  .pain-card ul{margin:0}
  .pain-card li{font-size:13px;padding:5px 0 5px 20px}
  /* 服务流程：数字块在左 */
  .steps{grid-template-columns:1fr;gap:14px}
  .step{display:flex;align-items:flex-start;gap:14px;text-align:left;padding:0}
  .step::after{display:none}
  .step-num{width:52px;height:52px;margin:0;flex:0 0 auto;font-size:22px;border-radius:14px}
  .step h3{font-size:16px;margin:0 0 4px}
  .step p{font-size:13px;line-height:1.5;margin:0}
  /* 保障：单列（内部已是横版） */
  .guarantee-grid{grid-template-columns:1fr;gap:14px}
  .g-item{padding:16px 18px}
  /* 案例：数字横排 + 引语单列 */
  .case-card{display:flex;align-items:center;justify-content:center;gap:10px;padding:14px;text-align:center}
  .case-card b{font-size:24px}
  .case-card span{font-size:13px}
  .case-quotes{grid-template-columns:1fr;gap:14px}
  .quote{padding:14px 16px}
}
@media (max-width:480px){
  .hero-cta{flex-direction:column}
  .hero-cta .btn{width:100%}
  .stats{grid-template-columns:1fr 1fr}
}

/* ================= GEO 知识库 / FAQ 栏目 ================= */
.faq-hero{padding-top:150px;padding-bottom:64px;min-height:auto;text-align:left}
.faq-hero h1{font-size:clamp(28px,4.5vw,50px);font-weight:900;line-height:1.25;margin-bottom:18px}
.breadcrumb{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:13px;color:var(--muted);margin-bottom:20px}
.breadcrumb a{color:var(--muted);transition:.25s}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb i{font-style:normal;opacity:.5}
.breadcrumb span{color:var(--cyan);max-width:70vw;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

.faq-section{padding:72px 0}
.faq-section .sec-sub{margin-bottom:32px}
.faq-list{display:grid;gap:14px;max-width:900px;margin:0 auto}
.faq-item{display:flex;align-items:center;justify-content:space-between;gap:16px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px 22px;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);transition:.3s}
.faq-item:hover{transform:translateY(-3px);border-color:rgba(34,211,238,.5);box-shadow:var(--shadow)}
.faq-item .fi-q{font-size:16px;font-weight:600;color:var(--text);line-height:1.5}
.faq-item .fi-arrow{flex:none;width:34px;height:34px;border-radius:50%;border:1px solid var(--line);display:grid;place-items:center;color:var(--cyan);font-size:16px;transition:.3s}
.faq-item:hover .fi-arrow{background:var(--grad);color:#fff;border-color:transparent}

.faq-body{padding:40px 0 72px}
.faq-detail-grid{display:grid;grid-template-columns:1fr 340px;gap:36px;align-items:start;max-width:1080px}
.faq-detail{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:38px 36px;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}
.faq-detail h1{font-size:clamp(24px,3vw,34px);font-weight:900;line-height:1.35;margin:16px 0 22px}
.faq-answer p{color:var(--text);font-size:16px;line-height:2;margin-bottom:18px}
.faq-answer p:last-child{margin-bottom:0}
.faq-meta{display:flex;gap:20px;flex-wrap:wrap;margin-top:26px;padding-top:20px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}
.faq-side{display:grid;gap:18px;position:sticky;top:100px}
.faq-side-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:22px 20px;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}
.faq-side-card h3{font-size:15px;color:var(--cyan);margin-bottom:14px}
.faq-side-card a{display:block;font-size:14px;color:var(--muted);line-height:1.6;padding:7px 0;border-bottom:1px dashed rgba(99,140,255,.14);transition:.25s}
.faq-side-card a:last-child{border-bottom:0}
.faq-side-card a:hover{color:var(--cyan);padding-left:6px}

.faq-cta-sec{padding:0 0 96px}
.faq-cta{background:linear-gradient(135deg,rgba(59,130,246,.12),rgba(139,92,246,.12));border:1px solid var(--line);border-radius:var(--radius);padding:48px 40px;text-align:center;max-width:860px;margin:0 auto}
.faq-cta h3{font-size:clamp(22px,3vw,30px);font-weight:800;margin-bottom:10px}
.faq-cta p{color:var(--muted);margin-bottom:26px}

@media (max-width:768px){
  .faq-detail-grid{grid-template-columns:1fr}
  .faq-side{position:static;grid-template-columns:1fr}
  .faq-detail{padding:28px 20px}
  .faq-cta{padding:36px 22px}
}