/* =========================================================================
 * 上海康琼信息科技有限公司 · 电子设备研发 ICP 官网
 * UI v3 —— 深海蓝 × 电光蓝 × 青碧 · 工业科技风重设计版
 * 设计令牌：深海军蓝(结构) / 电光蓝(主行动) / 青碧(辅助) / 琥珀(点缀)
 * ========================================================================= */
:root{
  --navy:#0A1E3C;
  --navy-2:#123157;
  --navy-3:#071630;
  --primary:#0F5FD6;
  --primary-d:#0B4CAD;
  --primary-soft:#E9F2FD;
  --teal:#0FA98E;
  --teal-d:#0B7A63;
  --teal-soft:#E7F6F2;
  --gold:#F0A32B;
  --gold-soft:#FBF1DE;
  --bg:#F2F5FA;
  --surface:#FFFFFF;
  --surface-2:#F8FAFD;
  --ink:#0D1B2A;
  --sub:#5C6B7E;
  --line:#E2E8F1;
  --line-2:#D3DCE8;
  --radius:16px;
  --radius-sm:10px;
  --maxw:1200px;
  --shadow:0 4px 18px rgba(10,30,60,.07);
  --shadow-lg:0 18px 44px rgba(10,30,60,.14);
  --grad:linear-gradient(120deg,var(--primary) 0%,#3B82F6 55%,var(--teal) 100%);
  --grad-navy:linear-gradient(160deg,var(--navy) 0%,var(--navy-2) 60%,#0B2547 100%);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.72;font-size:15px;-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px;width:100%}
.text-sub{color:var(--sub)}
.center{text-align:center}
.kicker{font-size:12px;letter-spacing:2.4px;text-transform:uppercase;color:var(--primary);font-weight:800;margin:0 0 8px}
.hl{color:var(--primary-d);font-weight:700}

/* ---------- 顶部信息条 ---------- */
.site-top{background:var(--navy);color:#A9BCD4;font-size:12.5px;letter-spacing:.2px}
.site-top .container{display:flex;justify-content:space-between;align-items:center;gap:14px;min-height:36px;flex-wrap:wrap}
.site-top a{color:#DCE8F7;font-weight:600}
.site-top a:hover{color:#fff}
.site-top .sep{color:rgba(255,255,255,.22);margin:0 10px}
.site-top .live{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--teal);margin-right:8px;vertical-align:1px;box-shadow:0 0 0 3px rgba(15,169,142,.22)}
.site-top .slogan{color:#8FA5C4}

/* ---------- 主导航（白底吸顶） ---------- */
.mainbar{background:rgba(255,255,255,.94);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);position:sticky;top:0;z-index:60;border-bottom:1px solid var(--line);transition:box-shadow .25s}
.mainbar.scrolled{box-shadow:0 6px 24px rgba(10,30,60,.10)}
.mainbar .container{display:flex;align-items:center;gap:18px;min-height:66px;position:relative}
.brand{display:flex;align-items:center;gap:12px;white-space:nowrap;min-width:0}
.brand .name{font-size:clamp(14px,1.55vw,17px);font-weight:800;color:var(--ink);line-height:1.2;letter-spacing:.2px;overflow:hidden;text-overflow:ellipsis;position:relative;padding-left:14px}
.brand .name::before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:4px;height:26px;border-radius:3px;background:var(--grad)}
.brand .name small{display:block;font-size:9.5px;color:var(--sub);font-weight:700;letter-spacing:1.8px;margin-top:3px}
.nav{display:flex;gap:2px;margin-left:auto;flex-wrap:wrap}
.nav a{padding:9px 15px;border-radius:10px;color:var(--sub);font-size:14.5px;font-weight:600;transition:.18s}
.nav a:hover{color:var(--primary-d);background:var(--primary-soft)}
.nav a.active{color:#fff;background:var(--grad);box-shadow:0 4px 12px rgba(15,95,214,.25)}
.auth-zone{display:flex;align-items:center;gap:10px;flex:none}
.auth-zone .user{font-size:13.5px;color:var(--primary-d);font-weight:700;max-width:96px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.nav-toggle{display:none;margin-left:auto;width:42px;height:38px;border:1px solid var(--line-2);border-radius:10px;background:#fff;cursor:pointer;padding:0;position:relative}
.nav-toggle span,.nav-toggle::before,.nav-toggle::after{content:"";position:absolute;left:11px;right:11px;height:2px;border-radius:2px;background:var(--ink);transition:.22s}
.nav-toggle::before{top:12px}
.nav-toggle span{top:18px}
.nav-toggle::after{bottom:12px}
.nav-toggle.open::before{top:18px;transform:rotate(45deg)}
.nav-toggle.open span{opacity:0}
.nav-toggle.open::after{bottom:18px;transform:rotate(-45deg)}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 20px;border-radius:10px;font-size:14px;cursor:pointer;border:1px solid transparent;transition:.18s;font-weight:700;line-height:1.1;white-space:nowrap}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 6px 16px rgba(15,95,214,.26)}
.btn-primary:hover{filter:brightness(1.07);transform:translateY(-1px)}
.btn-line{background:#fff;border:1px solid var(--line-2);color:var(--ink)}
.btn-line:hover{border-color:var(--primary);color:var(--primary-d)}
.btn-ghost{background:transparent;border-color:rgba(255,255,255,.45);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.14)}
.btn-light{background:rgba(255,255,255,.13);border:1px solid rgba(255,255,255,.5);color:#fff}
.btn-light:hover{background:rgba(255,255,255,.24)}
.btn-block{width:100%}

/* ---------- 通用区块 ---------- */
.section{padding:58px 0}
.section.alt{background:var(--surface)}
.section.dark{background:var(--grad-navy);color:#fff;position:relative;overflow:hidden}
.section.dark::after{content:"";position:absolute;right:-160px;top:-160px;width:480px;height:480px;border-radius:50%;background:radial-gradient(circle,rgba(15,95,214,.30),transparent 62%)}
.section-title{font-size:26px;font-weight:800;margin:0 0 10px;color:var(--ink);letter-spacing:.2px}
.section.dark .section-title{color:#fff}
.section-title .bar{display:inline-block;width:6px;height:25px;background:var(--grad);border-radius:4px;margin-right:12px;vertical-align:-4px}
.section-desc{color:var(--sub);margin:0 0 32px;font-size:15px;max-width:760px}
.section.dark .section-desc{color:#B9CDE6}
.breadcrumb{font-size:13px;color:var(--sub);padding:16px 0}
.breadcrumb a:hover{color:var(--primary)}

/* ---------- 首页 Hero ---------- */
.hero{background:
  radial-gradient(1100px 480px at 88% -12%,rgba(15,95,214,.38),transparent 60%),
  radial-gradient(860px 420px at -8% 112%,rgba(15,169,142,.24),transparent 60%),
  var(--grad-navy);
  color:#fff;padding:72px 0 68px;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:44px 44px;
  -webkit-mask-image:radial-gradient(ellipse at 50% 38%,#000 28%,transparent 76%);
  mask-image:radial-gradient(ellipse at 50% 38%,#000 28%,transparent 76%)}
.hero-inner{display:grid;grid-template-columns:1.06fr .94fr;gap:44px;align-items:center;position:relative;z-index:2}
.hero h1{font-size:36px;margin:0 0 16px;font-weight:800;line-height:1.3;letter-spacing:.3px}
.hero .lead{font-size:15.5px;color:#C6D8EE;margin:0 0 22px;max-width:620px}
.hero .tags{display:flex;gap:9px;flex-wrap:wrap;margin-bottom:26px}
.hero .tag{background:rgba(255,255,255,.09);border:1px solid rgba(255,255,255,.22);padding:6px 14px;border-radius:22px;font-size:13px;color:#DBE9F8;font-weight:600}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}
.hero-media{aspect-ratio:16/11;border-radius:20px;background:linear-gradient(135deg,#123157,#0F5FD6);box-shadow:var(--shadow-lg);position:relative;overflow:hidden;background-size:cover;background-position:center;border:1px solid rgba(255,255,255,.16)}
.hero-media::after{content:"";position:absolute;inset:0;background:linear-gradient(200deg,transparent 55%,rgba(7,22,48,.55))}
.hero-media .badge{position:absolute;left:16px;bottom:16px;z-index:2;background:rgba(7,22,48,.78);color:#fff;border:1px solid rgba(255,255,255,.26);border-radius:10px;padding:8px 14px;font-size:12.5px;font-weight:700;letter-spacing:.3px}
.cta-line{color:#C6D8EE;font-size:15px}
.cta-line b{color:#fff}
.cta-line .gap{display:inline-block;width:26px}

/* ---------- 编号特质区 ---------- */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feature{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px 24px 24px 26px;box-shadow:var(--shadow);transition:.2s;position:relative;overflow:hidden}
.feature::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--grad)}
.feature:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.feature .num{font-size:13px;font-weight:800;letter-spacing:1.6px;color:var(--primary);margin-bottom:8px}
.feature h3{margin:0 0 8px;font-size:17px}
.feature p{margin:0;color:var(--sub);font-size:14px}

/* ---------- 卡片网格 ---------- */
.grid{display:grid;gap:20px}
.grid.cols-2{grid-template-columns:repeat(2,1fr)}
.grid.cols-3{grid-template-columns:repeat(3,1fr)}
.grid.cols-4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);transition:.2s;min-width:0}
.card:hover{transform:translateY(-4px);border-color:var(--primary);box-shadow:var(--shadow-lg)}
.card h3{margin:0 0 8px;font-size:17px;color:var(--ink)}
.card .meta{font-size:13px;color:var(--sub);margin-top:10px}

/* 缩略图：真实图片 或 渐变占位 */
.thumb{aspect-ratio:4/3;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:14.5px;text-align:center;padding:12px;letter-spacing:.4px;background:linear-gradient(135deg,#123157,#0F5FD6);overflow:hidden}
.thumb img{width:100%;height:100%;object-fit:cover}

/* ---------- 产品中心 ---------- */
.cat-side{display:flex;gap:28px;align-items:flex-start}
.cat-list{flex:0 0 258px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:12px;position:sticky;top:84px;max-height:74vh;overflow:auto;box-shadow:var(--shadow)}
.cat-list a{display:block;padding:9px 12px;border-radius:8px;font-size:13.5px;color:var(--sub);border-left:3px solid transparent;transition:.15s}
.cat-list a:hover{background:var(--bg);color:var(--ink)}
.cat-list a.active{background:var(--primary-soft);color:var(--primary-d);border-left-color:var(--primary);font-weight:700}
.cat-content{flex:1;min-width:0}
.series-block{margin-bottom:40px;scroll-margin-top:86px}
.series-block h3{font-size:19px;margin:0 0 18px;padding:0 0 10px;border-bottom:2px solid var(--line);position:relative}
.series-block h3::after{content:"";position:absolute;left:0;bottom:-2px;width:52px;height:2px;background:var(--grad)}
.p-list{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.p-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:.2s;display:block;min-width:0}
.p-card:hover{transform:translateY(-4px);border-color:var(--primary);box-shadow:var(--shadow-lg)}
.p-card .thumb{border-radius:0;aspect-ratio:4/3}
.p-card:hover .thumb img{transform:scale(1.06)}
.p-card .thumb img{transition:transform .5s ease}
.p-card .body{padding:15px 17px 18px}
.p-card .body h4{margin:0 0 7px;font-size:15.5px}
.p-card .body p{margin:0 0 10px;font-size:13px;color:var(--sub)}
.p-card .body .spec,.spec-chip{font-size:12px;color:var(--primary-d);background:var(--primary-soft);display:inline-block;padding:3px 10px;border-radius:6px;font-weight:700}

/* ---------- 关于我们 ---------- */
.about-hero{display:grid;grid-template-columns:1.12fr .88fr;gap:34px;align-items:center}
.about-media{aspect-ratio:4/3;border-radius:var(--radius);background:linear-gradient(135deg,#0A1E3C,#0F5FD6);position:relative;overflow:hidden;box-shadow:var(--shadow-lg);background-size:cover;background-position:center}
.about-media::after{content:"";position:absolute;inset:0;background:radial-gradient(circle at 22% 28%,rgba(255,255,255,.20),transparent 44%)}
.about-text p{margin:0 0 14px}
.values{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:30px}
.value{background:var(--surface);border:1px solid var(--line);border-top:3px solid var(--primary);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);transition:.2s}
.value:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.value h4{margin:0 0 8px;color:var(--navy-2)}

/* ---------- 会员中心（信息发布） ---------- */
.post{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow);overflow:hidden;margin-bottom:22px;transition:.2s}
.post:hover{box-shadow:var(--shadow-lg)}
.post.tpl-A{display:grid;grid-template-columns:250px 1fr}
.post.tpl-A .thumb{height:100%;aspect-ratio:auto;border-radius:0}
.post.tpl-B .thumb{aspect-ratio:21/6;border-radius:0}
.post.tpl-C{display:grid;grid-template-columns:1fr 250px}
.post.tpl-C .thumb{height:100%;aspect-ratio:auto;border-radius:0;order:2}
.post .body{padding:22px 24px}
.post .body h3{margin:0 0 10px;font-size:18px;color:var(--navy-2)}
.post .body p{margin:0 0 16px;color:var(--sub);font-size:14px}
.post .tagline{display:inline-block;font-size:11.5px;letter-spacing:1.6px;font-weight:800;color:var(--teal-d);margin-bottom:7px}
.member-note{background:var(--teal-soft);border-left:3px solid var(--teal);border-radius:8px;padding:13px 18px;color:#20514A;font-size:13.5px;margin-bottom:26px}

/* ---------- 案例 ---------- */
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.case-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:.2s;display:block;min-width:0}
.case-card:hover{transform:translateY(-4px);border-color:var(--primary);box-shadow:var(--shadow-lg)}
.case-card .thumb{border-radius:0;aspect-ratio:16/9}
.case-card:hover .thumb img{transform:scale(1.06)}
.case-card .thumb img{transition:transform .5s ease}
.case-card .cbody{padding:18px 20px 20px}
.case-card .no{font-size:12px;color:var(--primary);font-weight:800;letter-spacing:1.6px}
.case-card h3{margin:7px 0 0;font-size:16px;color:var(--ink)}
.case-detail .name{font-size:26px;font-weight:800;margin:8px 0 22px;color:var(--navy-2)}
.case-detail .ph{aspect-ratio:16/9;border-radius:var(--radius);background:linear-gradient(135deg,#DDE7F2,#C7D9EA);background-size:cover;background-position:center;box-shadow:var(--shadow)}

/* ---------- 联系我们 ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:start}
.contact-info{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:8px 24px;box-shadow:var(--shadow);min-width:0}
.contact-info .row{display:flex;gap:14px;padding:15px 0;border-bottom:1px solid var(--line);font-size:14.5px}
.contact-info .row:last-child{border-bottom:none}
.contact-info .row .k{color:var(--primary-d);font-weight:800;flex:0 0 84px}
.contact-info .row .v{min-width:0;word-break:break-all}
.contact-form{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);min-width:0}
.contact-form h3{margin:0 0 4px;font-size:18px}
.contact-form label{display:block;font-size:13.5px;color:var(--sub);margin:14px 0 6px;font-weight:600}
.contact-form input,.contact-form textarea{width:100%;padding:12px 13px;border:1px solid var(--line-2);border-radius:10px;font-size:14px;font-family:inherit;background:var(--surface-2);transition:.18s}
.contact-form input:focus,.contact-form textarea:focus{outline:none;border-color:var(--primary);background:#fff;box-shadow:0 0 0 3px rgba(15,95,214,.12)}

/* 表单反馈（贴近触发位置的内联提示，非浏览器原生弹窗） */
.form-msg{display:none;margin-top:16px;font-size:13.5px;font-weight:600;line-height:1.6;border-radius:10px;padding:11px 14px;position:relative}
.form-msg::before{content:"";position:absolute;top:-6px;left:22px;width:10px;height:10px;transform:rotate(45deg);background:inherit;border-left:1px solid;border-top:1px solid;border-color:inherit}
.form-msg.show{display:block}
.form-msg.error{background:#FDECEA;color:#B42318;border:1px solid #F3C3BC}
.form-msg.success{background:var(--teal-soft);color:var(--teal-d);border:1px solid #B9E5D8}

/* ---------- 登录 / 注册 ---------- */
.auth-wrap{max-width:480px;margin:44px auto;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-lg);padding:32px}
.auth-tabs{display:flex;gap:8px;margin-bottom:24px;background:var(--bg);padding:5px;border-radius:12px}
.auth-tabs button{flex:1;padding:11px;border:none;background:transparent;border-radius:8px;cursor:pointer;font-size:15px;font-weight:700;color:var(--sub);transition:.18s}
.auth-tabs button.active{background:var(--grad);color:#fff;box-shadow:0 4px 12px rgba(15,95,214,.25)}
.auth-wrap label{display:block;font-size:13.5px;color:var(--sub);margin:14px 0 6px;font-weight:600}
.auth-wrap input{width:100%;padding:12px 13px;border:1px solid var(--line-2);border-radius:10px;font-size:14px;background:var(--surface-2);transition:.18s}
.auth-wrap input:focus{outline:none;border-color:var(--primary);background:#fff;box-shadow:0 0 0 3px rgba(15,95,214,.12)}
.field-note{display:flex;align-items:center;gap:7px;margin:9px 0 0;font-size:12.5px;color:var(--teal-d);font-weight:600;line-height:1.4}
.field-note::before{content:"";flex:none;width:15px;height:15px;background:url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Ccircle cx='8' cy='8' r='7' fill='%230FA98E'/%3E%3Cpath d='M4.6 8.3l2.2 2.2 4.5-4.7' fill='none' stroke='%23fff' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/contain no-repeat}
.agree{margin:18px 0;font-size:13.5px;color:var(--sub)}
.agree input{width:auto;margin-right:6px;vertical-align:-1px}
.agree a{color:var(--primary-d);text-decoration:underline;font-weight:600}
.err{display:none;color:#B42318;font-size:13px;min-height:18px;margin-top:10px;font-weight:600}
.err.show{display:block}

/* ---------- 协议页 ---------- */
.doc{max-width:880px;margin:0 auto;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:38px 42px;box-shadow:var(--shadow)}
.doc h1{font-size:26px;color:var(--navy-2);margin:0 0 4px}
.doc h2{font-size:19px;color:var(--navy-2);margin-top:30px;padding-left:12px;border-left:4px solid var(--primary);border-radius:2px}
.doc h3{font-size:16.5px;margin-top:22px}
.doc p{color:#33404F;margin:10px 0}
.doc ol{padding-left:22px}
.doc li{margin:8px 0}

/* ---------- 支付页 ---------- */
.pay{text-align:center;max-width:540px;margin:24px auto;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-lg);padding:34px;overflow:hidden}
.pay .qr{width:262px;height:262px;margin:18px auto;background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px;box-shadow:var(--shadow)}
.pay .qr img{width:100%;height:100%;object-fit:contain}
.pay .amount{font-size:24px;font-weight:800;color:var(--primary-d)}
.pay .hint{color:var(--sub);font-size:14px;margin:8px 0 22px}

/* ---------- 页脚 ---------- */
.footer{background:var(--grad-navy);color:#A9BCD4;padding:44px 0 26px;margin-top:34px;font-size:13.5px;position:relative;overflow:hidden}
.footer::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.028) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.028) 1px,transparent 1px);background-size:40px 40px;-webkit-mask-image:radial-gradient(ellipse at 70% 0%,#000,transparent 72%);mask-image:radial-gradient(ellipse at 70% 0%,#000,transparent 72%)}
.footer .container{position:relative;z-index:2}
.f-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.25fr;gap:34px}
.f-col{min-width:0}
.f-col h4{color:#fff;margin:0 0 14px;font-size:15px;letter-spacing:.3px;display:flex;align-items:center;gap:9px}
.f-col h4::before{content:"";display:inline-block;width:4px;height:15px;background:var(--grad);border-radius:2px}
.f-col p{margin:6px 0}
.f-brand p{color:#93A9C6;font-size:13px;line-height:1.75}
.f-domain{color:#7FD7C6!important;font-weight:700;letter-spacing:.6px;margin-top:12px!important}
.f-links a{display:block;padding:4px 0;color:#A9BCD4;transition:.16s;font-size:13.5px}
.f-links a:hover{color:#fff;transform:translateX(3px)}
.f-contact .row{display:flex;gap:10px;padding:5px 0;font-size:13.5px}
.f-contact .row .k{flex:0 0 40px;color:#7E93B2;font-weight:700}
.f-contact a{color:#DCE8F7}
.f-contact a:hover{color:#fff;text-decoration:underline}
.f-copy{border-top:1px solid rgba(255,255,255,.10);margin-top:28px;padding-top:16px;display:flex;flex-wrap:wrap;gap:6px 20px;justify-content:space-between;align-items:center;color:#7E93B2;font-size:12.5px}
.f-copy a{color:#9DB2CE}
.f-copy a:hover{color:#fff}
.f-support{opacity:.75;font-size:12px}
.f-support:hover{opacity:1}

/* ---------- 分栏：图文 / 双列内容 ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:center}
.split .media{aspect-ratio:4/3;border-radius:var(--radius);background:linear-gradient(135deg,#0A1E3C,#0F5FD6);background-size:cover;background-position:center;box-shadow:var(--shadow-lg)}
.stack{display:grid;gap:16px}

/* ---------- 返回顶部 ---------- */
.to-top{position:fixed;right:18px;bottom:24px;width:44px;height:44px;border-radius:12px;background:var(--grad);border:none;cursor:pointer;box-shadow:0 10px 26px rgba(15,95,214,.34);opacity:0;visibility:hidden;transform:translateY(10px);transition:.28s;z-index:70;padding:0}
.to-top.show{opacity:1;visibility:visible;transform:none}
.to-top:hover{filter:brightness(1.08)}
.to-top .arrow{position:absolute;left:15px;top:14px;width:14px;height:14px;border-left:2.5px solid #fff;border-top:2.5px solid #fff;transform:rotate(45deg)}

/* ---------- 滚动显现 ---------- */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}

/* ---------- 响应式 ---------- */
@media(max-width:1080px){
  .f-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:980px){
  .grid.cols-4{grid-template-columns:repeat(2,1fr)}
  .p-list{grid-template-columns:repeat(2,1fr)}
  .case-grid{grid-template-columns:repeat(2,1fr)}
  .hero-inner{grid-template-columns:1fr}
  .about-hero{grid-template-columns:1fr}
  .split{grid-template-columns:1fr}
  .cat-side{flex-direction:column}
  .cat-list{flex:none;width:100%;position:static;max-height:none}
  .nav{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);box-shadow:var(--shadow-lg);flex-direction:column;padding:10px 16px;gap:2px;margin-left:0}
  .nav.open{display:flex}
  .nav a{padding:12px 14px}
  .nav .auth-zone{padding:12px 14px 6px;display:flex;gap:10px;align-items:center;flex-wrap:wrap}
  .nav-toggle{display:inline-block}
  .mainbar .container{min-height:60px}
}
@media(max-width:680px){
  .site-top .slogan{display:none}
  .brand .name small{display:none}
  .grid.cols-3,.grid.cols-4,.grid.cols-2,.p-list,.case-grid,.values,.contact-grid,.features,.post.tpl-A,.post.tpl-C{grid-template-columns:1fr}
  .post.tpl-C .thumb{order:0}
  .hero{padding:52px 0 54px}
  .hero h1{font-size:26px}
  .doc{padding:24px 20px}
  .auth-wrap{padding:24px 20px;margin:28px auto}
  .pay{padding:26px 18px}
  .f-grid{grid-template-columns:1fr;gap:26px}
  .f-copy{justify-content:flex-start}
  .section{padding:44px 0}
  .auth-zone .btn-primary{padding:9px 14px;font-size:13px}
}