/* ==========================================================================
   冠巴客 AI 官网 · 全局样式
   品牌调性：AI(teal 科技) × 大家居暖通(松绿 + 暖橙 + 暖金)
   布局结构参考：AI酒店视频获客案例（编辑部式信息层级）
   ========================================================================== */

:root{
  --ink:#20261f;          /* 深暖墨色 */
  --muted:#6b7368;        /* 次级文字 */
  --paper:#f7f4ec;        /* 温暖纸张底色 */
  --white:#ffffff;
  --brand:#14533e;        /* 主色：松绿（大家居/暖通专业） */
  --brand-2:#2f7d5f;      /* 主色亮 */
  --teal:#17888d;         /* AI 科技强调 */
  --teal-deep:#0f6266;
  --coral:#d9693c;        /* 暖橙（暖通=温暖） */
  --gold:#d9a83f;         /* 暖金（18年品质） */
  --blue:#35648a;         /* 次级信息蓝 */
  --line:#dde2da;         /* 分割线 */
  --soft:#edf1ea;         /* 浅底 */
  --dark:#15211a;         /* 深色区块 */
  --dark-2:#0f1712;
  --max:1180px;
  --shadow:0 16px 42px rgba(23,35,30,.10);
  --shadow-sm:0 8px 24px rgba(23,35,30,.07);
  --radius:14px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:76px}
body{
  margin:0;color:var(--ink);background:var(--paper);
  font-family:"Microsoft YaHei","Noto Sans SC","PingFang SC",Arial,sans-serif;
  line-height:1.78;letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer}
ul,ol{padding-left:1.2em}
h1,h2,h3,h4,h5{margin:0;font-family:"Songti SC","STSong","Noto Serif SC",Georgia,serif;line-height:1.25;letter-spacing:0}
h1{font-size:clamp(38px,6vw,72px);color:#fff}
h2{font-size:clamp(28px,3.6vw,46px)}
h3{font-size:clamp(20px,2vw,27px)}
h4{font-size:18px;line-height:1.45}
p{margin:0 0 14px}

.container{width:min(var(--max),calc(100% - 40px));margin:0 auto}
.section{padding:88px 0;border-top:1px solid var(--line)}

/* 标题小标 + 分区头 */
.eyebrow{display:flex;align-items:center;gap:9px;margin:0 0 13px;color:var(--coral);font-size:13px;font-weight:900;letter-spacing:.08em;text-transform:uppercase}
.eyebrow:before{content:"";width:31px;height:3px;background:currentColor;flex:none}
.eyebrow.gold{color:#b0801f}
.eyebrow.teal{color:var(--teal)}
.kicker{color:var(--brand-2);font-size:14px;font-weight:900}
.section-head{display:grid;grid-template-columns:1fr minmax(280px,520px);gap:48px;align-items:end;margin-bottom:46px}
.section-head p{margin:0;color:var(--muted);font-size:16.5px}
.section-head.center{grid-template-columns:1fr;text-align:center;max-width:820px;margin-left:auto;margin-right:auto}
.section-head.center p{margin-top:14px}

/* ===================== 顶部导航 ===================== */
.topbar{height:68px;position:sticky;top:0;z-index:60;background:rgba(247,244,236,.94);backdrop-filter:blur(12px);border-bottom:1px solid rgba(23,35,30,.12)}
.topbar .container{height:100%;display:flex;align-items:center;justify-content:space-between;gap:18px}
.brand{display:flex;align-items:center;gap:11px;white-space:nowrap;font-weight:900}
.mark{display:grid;place-items:center;width:36px;height:36px;border-radius:9px;background:linear-gradient(135deg,var(--brand),var(--teal));color:#fff;font:700 17px "Songti SC","STSong",serif;box-shadow:0 4px 10px rgba(20,83,62,.3)}
.brand-name{font-size:18px;color:var(--ink);letter-spacing:.02em}
.brand-name b{color:var(--teal);font-weight:900;margin-left:1px}
.brand-sub{display:block;font-size:10.5px;color:var(--muted);font-weight:500;letter-spacing:.16em;margin-top:-2px}
.nav{display:flex;gap:2px;align-items:center}
.nav a{padding:9px 12px;color:#4e594f;font-size:14.5px;white-space:nowrap;border-bottom:2px solid transparent;transition:.18s}
.nav a:hover,.nav a.active{color:var(--brand);border-color:var(--coral)}
.nav .nav-cta{margin-left:8px;padding:9px 16px;border:0;border-radius:9px;background:var(--brand);color:#fff;font-weight:700}
.nav .nav-cta:hover{background:var(--teal-deep);color:#fff}
.nav-toggle{display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:9px;background:transparent;color:var(--brand)}
.nav-toggle span{display:block;width:20px;height:2px;background:currentColor;margin:4px auto;transition:.25s}

/* ===================== Hero ===================== */
.hero{min-height:calc(100svh - 68px);display:flex;align-items:flex-end;padding:86px 0 64px;position:relative;isolation:isolate;overflow:hidden;background:
  radial-gradient(1100px 620px at 88% -12%,rgba(23,136,141,.45),transparent 60%),
  radial-gradient(800px 520px at -8% 108%,rgba(217,105,60,.35),transparent 55%),
  linear-gradient(130deg,#0e2b21,#174d39 52%,#0f3a30)}
.hero:after{content:"";position:absolute;inset:0;z-index:-1;opacity:.5;
  background-image:linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);
  background-size:56px 56px}
.hero .eyebrow{color:#7fd0c9}
.hero h1{max-width:1000px}
.hero .lead{max-width:820px;margin:26px 0 30px;color:#e6efe9;font-size:clamp(17px,2.1vw,23px);line-height:1.7}
.tags{display:flex;flex-wrap:wrap;gap:10px}
.tags span{padding:7px 12px;border:1px solid rgba(255,255,255,.42);border-radius:20px;background:rgba(0,0,0,.2);color:#fff;font-size:13px}
.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);margin-top:48px;border-top:1px solid rgba(255,255,255,.32)}
.hero-stat{padding:22px 18px 0 0;color:#fff}
.hero-stat strong{display:block;color:#ffd87a;font:700 clamp(26px,3vw,44px)/1.1 Georgia,"Songti SC",serif}
.hero-stat span{color:#d6e5dd;font-size:13px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:34px}

/* ===================== 按钮 ===================== */
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 24px;border-radius:10px;font-weight:700;font-size:15px;transition:.2s;border:1px solid transparent}
.btn-primary{background:var(--coral);color:#fff;box-shadow:0 8px 22px rgba(217,105,60,.28)}
.btn-primary:hover{background:#c55b31;transform:translateY(-2px)}
.btn-brand{background:var(--brand);color:#fff}
.btn-brand:hover{background:var(--teal-deep);transform:translateY(-2px)}
.btn-ghost{border-color:rgba(255,255,255,.5);color:#fff;background:rgba(255,255,255,.06)}
.btn-ghost:hover{background:rgba(255,255,255,.16)}
.btn-outline{border-color:var(--brand);color:var(--brand);background:transparent}
.btn-outline:hover{background:var(--brand);color:#fff}
.btn-block{width:100%;justify-content:center}
.btn-sm{padding:9px 16px;font-size:13.5px}

/* ===================== 子页面 Hero（短版） ===================== */
.page-hero{position:relative;padding:74px 0 58px;overflow:hidden;color:#fff;background:
  radial-gradient(900px 480px at 90% -10%,rgba(23,136,141,.5),transparent 60%),
  radial-gradient(700px 420px at -8% 110%,rgba(217,105,60,.35),transparent 55%),
  linear-gradient(130deg,#0e2b21,#174d39 55%,#0f3a30)}
.page-hero:after{content:"";position:absolute;inset:0;opacity:.45;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);
  background-size:56px 56px}
.page-hero .container{position:relative;z-index:1}
.page-hero .eyebrow{color:#7fd0c9}
.page-hero h1{max-width:900px}
.page-hero .lead{max-width:760px;margin-top:20px;color:#e6efe9;font-size:17.5px}
.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:22px;color:#b9cec4;font-size:13px}
.breadcrumb a:hover{color:#fff}
.breadcrumb i{font-style:normal;opacity:.55}

/* ===================== 卡片与网格 ===================== */
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.grid-5{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}

.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px;box-shadow:var(--shadow-sm);transition:.22s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.card .icon{width:52px;height:52px;border-radius:12px;display:grid;place-items:center;font-size:24px;font-weight:900;margin-bottom:18px;color:#fff;background:linear-gradient(135deg,var(--brand),var(--teal))}
.card .icon.coral{background:linear-gradient(135deg,var(--coral),#ec8a55)}
.card .icon.gold{background:linear-gradient(135deg,#c8972a,var(--gold))}
.card .icon.blue{background:linear-gradient(135deg,var(--blue),#5a86ab)}
.card .tag{display:inline-block;padding:3px 9px;border-radius:6px;background:var(--soft);color:var(--brand-2);font-size:12px;font-weight:900;margin-bottom:13px}
.card h3{margin-bottom:10px}
.card p{color:var(--muted);font-size:14.5px;margin:0}
.card .more{display:inline-flex;align-items:center;gap:6px;margin-top:16px;color:var(--coral);font-weight:800;font-size:13.5px}
.card .more:hover{gap:10px}
.card .more i{transition:.2s;font-style:normal}

/* 方法地图（首页五大产品） */
.method-map{display:grid;grid-template-columns:repeat(5,1fr);background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm)}
.method{padding:26px 22px;border-right:1px solid var(--line);transition:.2s;display:block}
.method:last-child{border-right:0}
.method:hover{background:var(--soft)}
.method b{display:block;color:var(--coral);font-size:11.5px;letter-spacing:.05em}
.method strong{display:block;margin:7px 0;font:700 21px "Songti SC","STSong",serif;color:var(--ink)}
.method p{margin:0;color:var(--muted);font-size:13px;line-height:1.55}

/* 漏斗 */
.funnel{display:grid;grid-template-columns:repeat(5,1fr);margin:38px 0}
.funnel-item{position:relative;padding:22px 16px;background:#fff;border:1px solid var(--line)}
.funnel-item:not(:last-child):after{content:"›";position:absolute;right:-15px;top:34%;z-index:2;display:grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--coral);color:#fff;font-size:20px;font-weight:900}
.funnel-item b{color:var(--coral);font-size:12px}
.funnel-item strong{display:block;margin:5px 0}
.funnel-item span{color:var(--muted);font-size:12.5px}

/* 步骤（SOP） */
.sop{counter-reset:step;border-top:1px solid var(--line)}
.step{display:grid;grid-template-columns:84px 1fr minmax(220px,340px);gap:26px;padding:30px 0;border-bottom:1px solid var(--line);align-items:start}
.step:before{content:counter(step,decimal-leading-zero);counter-increment:step;color:var(--coral);font:700 46px/1 Georgia,serif}
.step h3{margin-bottom:6px}
.step p{color:var(--muted)}
.chip{display:inline-block;padding:4px 9px;margin:0 5px 6px 0;background:var(--soft);color:var(--brand);font-size:12px;font-weight:900;border-radius:6px}
.deliverable{padding:18px 20px;background:#fff;border-left:3px solid var(--teal);border-radius:8px;font-size:14px;color:var(--muted)}

/* 特征卡片（带数字） */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.feat{padding:26px 24px;background:#fff;border:1px solid var(--line);border-top:4px solid var(--teal);border-radius:var(--radius);box-shadow:var(--shadow-sm)}
.feat:nth-child(3n+2){border-color:var(--coral)}
.feat:nth-child(3n+3){border-color:var(--gold)}
.feat .fnum{font:700 15px/1 Georgia,serif;color:var(--muted)}
.feat h3{margin:10px 0 8px;font-size:19px}
.feat p{color:var(--muted);font-size:14px;margin:0}

/* 对比表 */
.matrix{width:100%;margin-top:30px;border-collapse:separate;border-spacing:0;background:#fff;font-size:14px;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.matrix th,.matrix td{padding:15px 17px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.matrix thead th{background:var(--brand);color:#fff;border-bottom:0}
.matrix tbody tr:last-child td{border-bottom:0}
.matrix tbody tr:hover{background:var(--soft)}

/* ===================== FAQ 问答 ===================== */
.faq-tabs{display:flex;flex-wrap:wrap;gap:10px;margin:0 0 34px}
.faq-tabs button{padding:10px 18px;border:1px solid var(--line);border-radius:24px;background:#fff;color:var(--muted);font-weight:800;font-size:14px;transition:.18s}
.faq-tabs button:hover{border-color:var(--brand);color:var(--brand)}
.faq-tabs button.active{background:var(--brand);border-color:var(--brand);color:#fff}
.faq-search{width:100%;max-width:460px;margin:0 0 8px auto;padding:12px 16px;border:1px solid var(--line);border-radius:10px;background:#fff;font-size:14.5px}
.faq-list{max-width:900px;margin:0 auto}
.faq-item{border:1px solid var(--line);border-radius:12px;background:#fff;margin-bottom:12px;overflow:hidden;box-shadow:0 3px 10px rgba(23,35,30,.03)}
.faq-q{width:100%;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:19px 22px;background:none;border:0;text-align:left;font-weight:700;font-size:16px;color:var(--ink)}
.faq-q .qmark{flex:none;width:28px;height:28px;border-radius:8px;display:grid;place-items:center;background:var(--soft);color:var(--teal);font:700 15px Georgia,serif}
.faq-q .chev{flex:none;transition:.25s;color:var(--muted);font-size:18px}
.faq-item.open .chev{transform:rotate(180deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease}
.faq-a-inner{padding:2px 22px 22px 60px;color:var(--muted);font-size:15px}
.faq-empty{padding:50px 20px;text-align:center;color:var(--muted)}

/* ===================== 文章 / 资讯 / 知识库 ===================== */
.post-toolbar{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-bottom:30px}
.filter-pills{display:flex;flex-wrap:wrap;gap:8px}
.filter-pills button{padding:8px 15px;border:1px solid var(--line);border-radius:20px;background:#fff;color:var(--muted);font-size:13.5px;font-weight:700}
.filter-pills button.active{background:var(--brand);border-color:var(--brand);color:#fff}
.post-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.post-card{display:flex;flex-direction:column;overflow:hidden;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm);transition:.22s}
.post-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.post-cover{aspect-ratio:16/9;display:grid;place-items:center;color:#fff;font:700 34px Georgia,serif;position:relative;overflow:hidden}
.post-cover img{width:100%;height:100%;object-fit:cover}
.post-cover .pc-label{position:absolute;left:14px;top:14px;padding:3px 9px;border-radius:6px;background:rgba(0,0,0,.35);color:#fff;font-size:11px;font-weight:800;letter-spacing:.06em}
.post-body{padding:22px;display:flex;flex-direction:column;flex:1}
.post-cat{color:var(--coral);font-size:12px;font-weight:900;letter-spacing:.04em}
.post-body h3{margin:9px 0 9px;font-size:19px;line-height:1.45}
.post-body h3 a:hover{color:var(--brand)}
.post-sum{color:var(--muted);font-size:13.5px;flex:1}
.post-meta{display:flex;gap:12px;align-items:center;margin-top:16px;padding-top:14px;border-top:1px solid var(--line);color:#98a29a;font-size:12.5px}
.post-meta b{color:var(--teal);font-weight:700}
/* 列表式（资讯页可选） */
.post-list{display:flex;flex-direction:column;gap:14px}
.post-row{display:grid;grid-template-columns:200px 1fr;gap:22px;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;box-shadow:var(--shadow-sm)}
.post-row .post-cover{aspect-ratio:auto;min-height:100%}
.post-row .post-body{padding:20px}

/* 文章详情：结构参考企业资讯详情页，保留冠巴客品牌视觉 */
.article-page{background:#f2f3f1}
.article-breadcrumb-band{padding:28px 0 24px;background:#f2f3f1}
.article-breadcrumb{display:flex;align-items:center;gap:8px;color:#747c74;font-size:14px}
.article-breadcrumb a{color:#566158}
.article-breadcrumb a:hover{color:var(--brand)}
.article-breadcrumb i{font-style:normal;color:#a2aaa4}
.home-link{width:26px;height:26px;display:grid;place-items:center;color:var(--brand)!important;font-size:22px;line-height:1}
.article-stage{padding:0 0 74px;background:#f2f3f1}
.article-shell{overflow:hidden;background:#fff;border:1px solid #e6e9e4;box-shadow:0 8px 30px rgba(23,35,30,.05)}
.article-tools{min-height:106px;padding:25px 54px;display:flex;align-items:center;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line)}
.article-back{display:inline-flex;align-items:center;gap:13px;padding:13px 28px;border-radius:999px;background:#f5f6f4;color:#29322c;font-size:16px;font-weight:700;transition:.2s}
.article-back:hover{background:var(--soft);color:var(--brand)}
.article-back:first-letter{font-size:22px}
.article-share{display:flex;align-items:center;gap:11px}
.share-icon{width:39px;height:39px;display:grid;place-items:center;border-radius:50%;background:#fff;font-size:18px;line-height:1;transition:.2s}
.share-icon:hover{transform:translateY(-2px)}
.share-icon.green{border:1px solid #6eb942;color:#5ea932}
.share-icon.blue{border:1px solid #59a9dc;color:#4597cf}
.share-icon.coral{border:1px solid var(--coral);color:var(--coral)}
.article-wrap{max-width:1080px;margin:0 auto;padding:50px 60px 70px}
.article-head{margin-bottom:42px;padding-bottom:28px;border-bottom:0}
.article-head .post-cat{display:inline-block;margin-bottom:13px;padding:4px 10px;border-radius:5px;background:var(--soft);color:var(--brand)}
.article-head h1{max-width:1000px;color:var(--ink);font-size:clamp(29px,3.4vw,42px);line-height:1.35}
.article-head .post-meta{margin-top:14px;border:0;padding:0;color:#818b83;font-size:14px}
.article-head .post-meta b{color:#818b83;font-weight:500}
.article-body{font-size:17px;color:#252b26}
.article-body>p:first-child{font-weight:700;color:#222a23}
.article-body h2{margin:40px 0 16px;font-size:24px}
.article-body h3{margin:28px 0 12px;font-size:20px}
.article-body p{margin-bottom:20px;line-height:2}
.article-body ul,.article-body ol{margin:0 0 22px;line-height:1.95}
.article-body li{margin-bottom:8px}
.article-body blockquote{margin:24px 0;padding:18px 22px;border-left:4px solid var(--gold);background:#fff8e7;color:#554a31;border-radius:6px}
.article-body img{border-radius:8px;margin:24px auto}
.article-nav{display:flex;justify-content:space-between;gap:16px;margin-top:46px;padding-top:22px;border-top:1px solid var(--line)}
.article-nav a{color:var(--brand);font-size:14px;font-weight:700}

/* ===================== 信息块 / CTA / Footer ===================== */
.stat-band{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.stat-band .stat{padding:26px 22px;background:#fff}
.stat-band .stat strong{display:block;color:var(--brand);font:700 clamp(28px,3vw,42px)/1.1 Georgia,serif}
.stat-band .stat span{color:var(--muted);font-size:13px}

.callout{display:flex;gap:16px;align-items:flex-start;padding:20px 22px;background:#fff8e7;border-left:4px solid var(--gold);color:#554a31;font-size:14.5px;border-radius:8px}

.together{background:var(--brand);color:#fff;border-top:0}
.together h2{color:#fff}
.together .section-head p{color:#cfe3da}
.team{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:rgba(255,255,255,.18);border-radius:var(--radius);overflow:hidden}
.team article{padding:26px;background:var(--brand)}
.team strong{display:block;margin-bottom:8px;color:#ffd87a}
.team p{color:#d7e8e0;font-size:13.5px;margin:0}

.cta{padding:80px 0;background:#e9eee8}
.cta-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:44px;align-items:center}
.cta h2{max-width:640px}
.cta>p,.cta-grid>div>p{color:var(--muted);font-size:16.5px}
.cta-box{padding:30px;background:#fff;border-left:4px solid var(--coral);border-radius:12px;box-shadow:var(--shadow)}
.cta-box strong{display:block;margin-bottom:8px;color:var(--brand);font:700 26px/1.3 Georgia,serif}
.cta-box span{color:var(--muted);font-size:14.5px}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:20px}

footer{padding:46px 0 0;background:var(--dark-2);color:#9fb2a7;font-size:13.5px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:36px;padding-bottom:34px}
.footer-grid h4{color:#fff;font-size:15px;margin-bottom:16px;font-family:inherit;font-weight:700}
.footer-grid a{display:block;padding:4px 0;color:#9fb2a7}
.footer-grid a:hover{color:#fff}
.footer-brand p{color:#9fb2a7;max-width:340px;font-size:13px}
.footer-contact{margin-top:14px!important;padding-top:14px;border-top:1px solid rgba(255,255,255,.08);line-height:1.8}
.footer-contact a{display:inline;color:#c8d5ce}
.footer-contact a:hover{color:#fff}
.footer-bottom{padding:20px;border-top:1px solid rgba(255,255,255,.08);display:flex;justify-content:center;align-items:center;gap:6px 24px;flex-wrap:wrap;text-align:center;color:#869b8e;font-size:12.5px}
.footer-bottom>span:nth-child(2){order:1;flex-basis:100%;color:#63776b;font-size:12px}
.footer-icp{white-space:nowrap;color:#9fb2a7}
.footer-icp:hover{color:#fff;text-decoration:underline;text-underline-offset:3px}
.contact-panel{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;margin-top:34px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.contact-item{padding:24px;background:#fff}
.contact-item b{display:block;margin-bottom:6px;color:var(--brand);font-size:14px}
.contact-item a,.contact-item span{color:var(--ink);font-weight:700}

/* ===================== 动画 ===================== */
.reveal{opacity:0;transform:translateY(18px);transition:.55s ease}
.reveal.visible{opacity:1;transform:none}

/* ===================== 响应式 ===================== */
@media(max-width:960px){
  .nav{position:fixed;inset:68px 0 auto 0;flex-direction:column;align-items:stretch;background:var(--paper);border-bottom:1px solid var(--line);padding:14px 20px 20px;gap:4px;transform:translateY(-8px);opacity:0;pointer-events:none;transition:.22s}
  .nav.open{transform:none;opacity:1;pointer-events:auto}
  .nav a{padding:13px 8px;border-bottom:1px solid var(--line)}
  .nav .nav-cta{margin:10px 0 0;text-align:center}
  .nav-toggle{display:block}
  .section{padding:66px 0}
  .section-head{grid-template-columns:1fr;gap:16px}
  .method-map{grid-template-columns:1fr}
  .method{border-right:0;border-bottom:1px solid var(--line)}
  .method:last-child{border-bottom:0}
  .grid-4,.grid-5,.team{grid-template-columns:1fr 1fr}
  .feat-grid{grid-template-columns:1fr 1fr}
  .post-grid{grid-template-columns:1fr 1fr}
  .step{grid-template-columns:66px 1fr}
  .deliverable{grid-column:2}
  .funnel{grid-template-columns:1fr}
  .funnel-item:not(:last-child):after{content:"⌄";right:18px;top:auto;bottom:-15px}
  .cta-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:620px){
  .container{width:calc(100% - 28px)}
  .hero{min-height:720px;padding-bottom:40px}
  .hero h1{font-size:38px}
  .hero .lead{font-size:17px}
  .hero-stats{grid-template-columns:1fr 1fr}
  .hero-stat{padding-top:17px}
  .grid-2,.grid-3,.grid-4,.grid-5,.feat-grid,.team,.post-grid{grid-template-columns:1fr}
  .step{grid-template-columns:46px 1fr;gap:12px}
  .step:before{font-size:32px}
  .deliverable{grid-column:1/-1}
  .post-row{grid-template-columns:1fr}
  .post-row .post-cover{min-height:160px}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{padding:18px 14px;flex-direction:column;gap:6px}
  .footer-bottom>span:nth-child(2){flex-basis:auto}
  .contact-panel{grid-template-columns:1fr}
  .matrix{display:block;overflow-x:auto}
  .faq-a-inner{padding-left:22px}
  .article-nav{flex-direction:column}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
}

/* ==========================================================================
   案例中心
   ========================================================================== */
.case-toolbar{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 30px}
.case-toolbar button{padding:9px 16px;border:1px solid var(--line);border-radius:22px;background:#fff;color:var(--muted);font-size:14px;font-weight:800;transition:.18s}
.case-toolbar button:hover{border-color:var(--brand);color:var(--brand)}
.case-toolbar button.active{background:var(--brand);border-color:var(--brand);color:#fff}

.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.case-card{overflow:hidden;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm);transition:.22s;display:flex;flex-direction:column;cursor:pointer}
.case-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.case-cover{position:relative;aspect-ratio:16/10;background-size:cover;background-position:center;background-color:var(--brand);display:grid;place-items:center;color:#fff}
.case-cover:after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(10,20,15,.55),transparent 45%)}
.case-cover.grad{background-image:linear-gradient(135deg,#14533e,#17888d)}
.case-cover.grad.ai-outcall{background-image:linear-gradient(135deg,#8a6b1e,#d9a83f)}
.case-cover.grad.ai-employee{background-image:linear-gradient(135deg,#b14f26,#d9693c)}
.case-cover.grad.ai-training{background-image:linear-gradient(135deg,#0f3a30,#2f7d5f)}
.case-cover.grad.geo{background-image:linear-gradient(135deg,#23456b,#35648a)}
.case-cover .case-sol{position:absolute;left:14px;top:14px;z-index:2;padding:4px 10px;border-radius:6px;background:rgba(0,0,0,.38);color:#fff;font-size:11.5px;font-weight:800;letter-spacing:.04em}
.case-cover .case-glyph{position:relative;z-index:2;font:700 46px/1 Georgia,serif;opacity:.9}
.case-play{position:relative;z-index:3;width:60px;height:60px;border-radius:50%;border:0;background:rgba(255,255,255,.92);color:var(--brand);font-size:22px;display:grid;place-items:center;box-shadow:0 8px 24px rgba(0,0,0,.28);transition:.2s;padding-left:4px}
.case-card:hover .case-play{transform:scale(1.08);background:#fff}
.case-body{padding:22px;display:flex;flex-direction:column;flex:1}
.case-body h3{margin:0 0 5px;font-size:19px;line-height:1.45}
.case-client{color:var(--coral);font-size:12.5px;font-weight:800;margin:0 0 9px}
.case-sum{color:var(--muted);font-size:13.5px;margin:0;flex:1}
.case-tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:14px}
.case-tags span{padding:3px 9px;border-radius:6px;background:var(--soft);color:var(--brand-2);font-size:11.5px;font-weight:800}
.case-metrics{display:flex;gap:18px;margin-top:14px;padding-top:14px;border-top:1px solid var(--line)}
.case-metric strong{display:block;color:var(--brand);font:700 22px/1.1 Georgia,serif}
.case-metric span{color:var(--muted);font-size:11.5px}

/* 播放弹窗 + 图片灯箱 */
.modal{position:fixed;inset:0;z-index:100;display:none;align-items:center;justify-content:center;padding:24px;background:rgba(8,15,11,.86);backdrop-filter:blur(4px)}
.modal.open{display:flex}
.modal-close{position:absolute;top:18px;right:22px;width:44px;height:44px;border-radius:50%;border:1px solid rgba(255,255,255,.4);background:transparent;color:#fff;font-size:24px;line-height:1;transition:.2s}
.modal-close:hover{background:rgba(255,255,255,.15)}
.modal-inner{width:min(920px,100%);position:relative}
.modal-frame{position:relative;aspect-ratio:16/9;background:#000;border-radius:12px;overflow:hidden}
.modal-frame iframe,.modal-frame video{position:absolute;inset:0;width:100%;height:100%;border:0;display:block;object-fit:contain}
.modal-note{display:grid;place-items:center;height:100%;text-align:center;color:#cfe0d6;padding:30px}
.modal-note b{display:block;margin-bottom:8px;font-size:18px}
.modal-note p{margin:0;font-size:14px;color:#9db5a8;max-width:460px}
.modal-title{margin-top:16px;color:#fff;font-size:16px;font-weight:700;text-align:center}
.lightbox{position:fixed;inset:0;z-index:100;display:none;align-items:center;justify-content:center;padding:30px;background:rgba(8,15,11,.9)}
.lightbox.open{display:flex}
.lightbox img{max-width:100%;max-height:88vh;border-radius:10px;box-shadow:0 20px 60px rgba(0,0,0,.5)}
.lightbox .modal-close{top:14px;right:18px}

@media(max-width:960px){
  .case-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:620px){
  .case-grid{grid-template-columns:1fr}
  .case-cover{aspect-ratio:16/11}
}