:root{
  --blue:#1664AB; --blue2:#2B8FE8; --orange:#FF8C00;
  --n900:#0D1B2A; --n700:#33415C; --n500:#64748B; --n200:#D9E2EC; --n50:#F4F7FB; --white:#fff;
  --r-lg:16px; --r-xl:24px;
  --shadow:0 4px 24px rgba(22,100,171,.08); --shadow-h:0 12px 36px rgba(22,100,171,.18);
  --grad:linear-gradient(135deg,#1664AB,#2B8FE8);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Inter","PingFang SC","Microsoft YaHei",sans-serif;color:var(--n900);background:var(--white);line-height:1.6;-webkit-font-smoothing:antialiased}
h1,h2,h3,.serif{font-family:"Noto Serif SC",serif}
a{color:inherit;text-decoration:none}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}
.btn{display:inline-block;padding:13px 28px;border-radius:999px;font-weight:700;font-size:15px;transition:.25s;cursor:pointer;border:0}
.btn-primary{background:var(--grad);color:#fff;box-shadow:var(--shadow)}
.btn-primary:hover{box-shadow:var(--shadow-h);transform:translateY(-2px)}
.btn-ghost{background:#fff;color:var(--blue);border:2px solid var(--blue)}
.btn-ghost:hover{background:var(--blue);color:#fff}
.btn-orange{background:var(--orange);color:#fff}
.btn-light{background:#fff;color:var(--green,#0a8a4a);box-shadow:0 6px 16px rgba(0,0,0,.12)}
.btn-light:hover{transform:translateY(-2px);box-shadow:0 10px 22px rgba(0,0,0,.18)}
.btn-orange:hover{filter:brightness(1.05);transform:translateY(-2px)}
.tag{display:inline-block;padding:4px 12px;border-radius:999px;background:rgba(255,140,0,.12);color:var(--orange);font-size:13px;font-weight:700}
.tag-blue{background:rgba(22,100,171,.1);color:var(--blue)}
section{padding:84px 0}
.sec-head{text-align:center;margin-bottom:48px}
.sec-head h2{font-size:34px;margin-bottom:12px}
.sec-head p{color:var(--n500);max-width:640px;margin:0 auto}

/* NAV */
header.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--n200)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;color:var(--blue)}
.logo .mark{width:34px;height:34px;border-radius:9px;background:var(--grad);color:#fff;display:flex;align-items:center;justify-content:center;font-size:18px}
nav.menu{display:flex;gap:26px;font-size:15px;font-weight:600;color:var(--n700)}
nav.menu a:hover{color:var(--blue)}
nav.menu a.active{color:var(--blue)}

/* HERO */
.hero{background:radial-gradient(1200px 500px at 70% -10%,rgba(43,143,232,.15),transparent),var(--n50);padding:96px 0 80px}
.hero h1{font-size:46px;line-height:1.25;margin:18px 0}
.hero h1 .hl{color:var(--blue)}
.hero p.sub{font-size:18px;color:var(--n700);max-width:620px}
.hero-cta{margin-top:30px;display:flex;gap:14px;flex-wrap:wrap}
.eco-tags{margin-top:26px;display:flex;gap:10px;flex-wrap:wrap}

/* INNER PAGE HERO */
.page-hero{background:var(--grad);color:#fff;padding:66px 0 54px}
.page-hero h1{font-size:38px;margin-bottom:10px}
.page-hero p{opacity:.92;max-width:660px;font-size:17px}

/* STATS */
.stats{display:flex;gap:24px;flex-wrap:wrap;margin-top:54px}
.stat{flex:1;min-width:160px;background:#fff;border-radius:var(--r-lg);padding:26px;box-shadow:var(--shadow);text-align:center}
.stat b{display:block;font-size:34px;color:var(--blue);font-family:"Noto Serif SC",serif}
.stat span{color:var(--n500);font-size:14px}

/* CARDS GRID */
.grid{display:grid;gap:24px}
.g4{grid-template-columns:repeat(4,1fr)}
.g5{grid-template-columns:repeat(5,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.card{background:#fff;border-radius:var(--r-lg);padding:28px;box-shadow:var(--shadow);transition:.25s;border:1px solid transparent}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-h);border-color:var(--blue)}
.card .ic{width:48px;height:48px;border-radius:12px;background:var(--grad);color:#fff;display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:16px}
.card h3{font-size:19px;margin-bottom:8px}
.card p{color:var(--n500);font-size:14px}
.card.ext{border-top:4px solid var(--orange)}
.card.ext .ic{background:var(--orange)}

/* SOLUTIONS */
.sol{background:var(--white)}
.sol .card{background:var(--n50)}

/* PARTNERS */
.partner-wall{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.pcard{background:#fff;border-radius:var(--r-lg);padding:26px;box-shadow:var(--shadow);display:flex;flex-direction:column;align-items:center;gap:14px;text-align:center;transition:.25s}
.pcard:hover{transform:translateY(-4px);box-shadow:var(--shadow-h)}
.plogo{width:100%;height:56px;border-radius:12px;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:17px;letter-spacing:1px}
.pcard .pname{font-weight:700;font-size:16px}
.pcard .pdesc{color:var(--n500);font-size:13px;min-height:38px}
.pcard a.go{font-size:13px;color:var(--blue);font-weight:700}

/* TENCENT CLOUD EXCLUSIVE */
.tc-band{background:var(--grad);color:#fff;border-radius:var(--r-xl);padding:48px;margin-top:40px}
.tc-band h3{font-size:26px;margin-bottom:8px}
.tc-band p{opacity:.9;margin-bottom:26px}
.tc-links{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.tc-btn{display:block;background:#fff;color:var(--blue);border-radius:14px;padding:20px;text-align:center;font-weight:700;transition:.25s}
.tc-btn:hover{transform:translateY(-3px);box-shadow:0 10px 30px rgba(0,0,0,.2)}
.tc-btn small{display:block;font-weight:500;color:var(--n500);font-size:12px;margin-top:6px}

/* ABOUT + FORM */
.about-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:40px;align-items:start}
.info-line{display:flex;gap:10px;margin:10px 0;color:var(--n700);font-size:15px}
.info-line b{color:var(--n900);min-width:72px}
.form-box{background:var(--n50);border-radius:var(--r-xl);padding:32px}
.form-box label{display:block;font-size:13px;font-weight:700;color:var(--n700);margin:14px 0 6px}
.form-box input,.form-box textarea{width:100%;padding:12px 14px;border:1px solid var(--n200);border-radius:10px;font-size:14px;font-family:inherit;background:#fff}
.form-box .note{font-size:12px;color:var(--n500);margin-top:10px}

/* CTA BAND */
.cta-band{background:var(--n50);border-radius:var(--r-xl);padding:56px;text-align:center;margin-top:20px}
.cta-band h2{font-size:30px;margin-bottom:12px}
.cta-band p{color:var(--n500);max-width:560px;margin:0 auto 24px}

/* 活动轮播 banner */
.promo{padding:10px 0 4px}
.promo-banner{max-width:1080px;margin:0 auto;border-radius:var(--r-xl,16px);overflow:hidden;background:linear-gradient(120deg,#0a8a4a,#16A085);color:#fff;display:flex;align-items:center;justify-content:space-between;gap:24px;padding:26px 32px;box-shadow:0 12px 30px rgba(10,138,74,.20)}
.promo-banner .pb-badge{display:inline-block;background:rgba(255,255,255,.18);padding:4px 12px;border-radius:999px;font-size:12px;margin-bottom:10px}
.promo-banner .pb-text h3{font-size:22px;margin:0 0 8px}
.promo-banner .pb-text p{margin:0;font-size:14px;opacity:.94;max-width:600px;line-height:1.65}
.promo-banner .pb-cta{display:flex;flex-direction:column;gap:10px;flex-shrink:0}
.promo-banner .pb-cta .btn-ghost{border-color:#fff;color:#fff;background:transparent}
.promo-banner .pb-cta .btn-ghost:hover{background:#fff;color:#0a8a4a}

/* FOOTER */
footer{background:var(--n900);color:#cbd5e1;padding:56px 0 28px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px}
footer h4{color:#fff;font-size:15px;margin-bottom:14px}
footer a{color:#cbd5e1;font-size:14px;display:block;margin:7px 0}
footer a:hover{color:var(--orange)}
.compliance{border-top:1px solid #1e293b;margin-top:36px;padding-top:20px;text-align:center;font-size:13px;color:#94a3b8}
.compliance a{display:inline;color:#94a3b8;margin:0 6px}
.banner{background:#FFF7ED;border:1px solid #FED7AA;color:#9A3412;font-size:13px;text-align:center;padding:8px 16px}
/* QUALIFICATIONS */
.qgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.qcard{background:#fff;border-radius:var(--r-lg);padding:22px;box-shadow:var(--shadow);border-left:4px solid var(--blue);transition:.25s}
.qcard:hover{transform:translateY(-3px);box-shadow:var(--shadow-h)}
.qcard h3{font-size:17px;margin-bottom:6px}
.qcard p{color:var(--n500);font-size:13px}
.badge{display:inline-block;padding:3px 10px;border-radius:999px;font-size:12px;font-weight:700;margin-top:10px}
.badge-ok{background:rgba(22,100,171,.1);color:var(--blue)}
.badge-ing{background:rgba(255,140,0,.14);color:var(--orange)}
.qcard a.go{display:inline-block;margin-top:10px;color:var(--blue);font-weight:700;font-size:13px}
.note-line{background:var(--n50);border-radius:var(--r-lg);padding:18px 22px;color:var(--n700);font-size:14px;margin-top:30px;line-height:1.7}
.note-line b{color:var(--n900)}
@media(max-width:900px){.g4,.g5,.g3,.g2,.partner-wall,.tc-links,.qgrid{grid-template-columns:1fr}.about-grid,.foot-grid{grid-template-columns:1fr}nav.menu{display:none}}
/* 企业微信名片 + 自媒体矩阵 */
.wecom-card{display:flex;align-items:center;gap:24px;background:#fff;border-radius:var(--r-lg);padding:24px;box-shadow:var(--shadow);border-left:4px solid var(--blue);margin-top:18px}
.wecom-card img.wecom-qr{width:180px;height:auto;border-radius:8px;flex-shrink:0}
.wecom-card .wecom-info h3{font-size:18px;margin-bottom:6px}
.wecom-card .wecom-info p{color:var(--n500);font-size:13px;margin-bottom:4px}
.sm-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:18px;margin-top:18px}
.sm-card{background:#fff;border-radius:var(--r-lg);padding:20px;box-shadow:var(--shadow);text-align:center;transition:.25s}
.sm-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-h)}
.sm-card .sm-platform{color:var(--n500);font-size:12px;margin-bottom:4px}
.sm-card .sm-name{font-weight:700;color:var(--blue);margin-bottom:12px;font-size:15px}
.sm-card .qr-placeholder{width:120px;height:120px;margin:0 auto;border:2px dashed #d6dde6;border-radius:8px;display:flex;align-items:center;justify-content:center;color:var(--n500);font-size:12px;background:#f7f9fc}
.sm-card .sm-link{display:inline-block;margin-top:12px;color:var(--blue);font-weight:700;font-size:13px}
@media(max-width:900px){.sm-grid{grid-template-columns:1fr 1fr}.wecom-card{flex-direction:column;text-align:center}}

/* 首页轮播图（16:9 · 手机自适应 · 增减图片只需增删 .slide 一行） */
.slider{position:relative;max-width:1080px;margin:44px auto 0;overflow:hidden;border-radius:var(--r-xl);box-shadow:var(--shadow);background:var(--n200)}
.slider-track{display:flex;transition:transform .5s ease;will-change:transform}
.slide{flex:0 0 100%;aspect-ratio:16/9}
.slide img{width:100%;height:100%;object-fit:cover;display:block}
.slider-btn{position:absolute;top:50%;transform:translateY(-50%);width:42px;height:42px;border:0;border-radius:50%;background:rgba(13,27,42,.42);color:#fff;font-size:22px;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:.2s;z-index:2}
.slider-btn:hover{background:rgba(13,27,42,.72)}
.slider-btn.prev{left:14px}
.slider-btn.next{right:14px}
.slider-dots{position:absolute;bottom:14px;left:50%;transform:translateX(-50%);display:flex;gap:8px;z-index:2}
.slider-dots button{width:9px;height:9px;border:0;border-radius:999px;background:rgba(255,255,255,.6);cursor:pointer;padding:0;transition:.25s}
.slider-dots button.active{background:#fff;width:22px}
@media(max-width:600px){
  .slider{margin-top:28px;border-radius:14px}
  .slider-btn{width:34px;height:34px;font-size:18px}
  .slider-btn.prev{left:8px}.slider-btn.next{right:8px}
  .slider-dots{bottom:10px;gap:6px}
  .slider-dots button{width:7px;height:7px}
  .slider-dots button.active{width:16px}
}

/* 全站悬浮企业微信二维码（左下角 · 每页可见 · 手机自适应） */
.wecom-float{position:fixed;left:18px;bottom:18px;z-index:999;width:118px;background:#fff;border:1px solid rgba(13,27,42,.08);border-radius:14px;box-shadow:0 8px 28px rgba(13,27,42,.16);padding:8px 8px 7px;text-align:center;transition:transform .2s,box-shadow .2s}
.wecom-float img{width:100%;height:auto;display:block;border-radius:8px}
.wf-label{display:block;margin-top:6px;font-size:12px;color:var(--blue);font-weight:700;line-height:1.2}
.wf-close{position:absolute;top:-8px;right:-8px;width:22px;height:22px;border:0;border-radius:50%;background:#0D1B2A;color:#fff;font-size:13px;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;opacity:.85;transition:opacity .2s}
.wf-close:hover{opacity:1}
.wecom-float:hover{transform:translateY(-3px);box-shadow:0 12px 32px rgba(13,27,42,.22)}
@media(max-width:600px){
  .wecom-float{left:10px;bottom:10px;width:92px;padding:6px;border-radius:10px}
  .wf-label{font-size:10px;margin-top:4px}
  .wf-close{width:19px;height:19px;font-size:12px;top:-7px;right:-7px}
}

/* ========== ToDesk 平台截图网格（点击图片跳下载） ========== */
.todesk-imggrid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:12px}
.todesk-imggrid--3{grid-template-columns:repeat(3,1fr)}
.todesk-imggrid a{
  display:flex;align-items:center;justify-content:center;padding:8px;border-radius:14px;overflow:hidden;background:#fff;
  border:1px solid var(--n200);transition:.25s;box-shadow:var(--shadow);min-width:0
}
.todesk-imggrid a:hover{transform:translateY(-4px);box-shadow:var(--shadow-h);border-color:var(--blue)}
.todesk-imggrid img{max-width:100%;max-height:110px;width:auto;height:auto;object-fit:contain;display:block}
.todesk-note{font-size:13px;color:var(--n500);margin-top:12px}
.todesk-note a{color:var(--blue);font-weight:600}
.tc-downlinks{display:flex;flex-wrap:wrap;gap:8px;margin-top:6px}
.tc-downlinks a{display:inline-block;padding:5px 12px;background:var(--blue-50,#eef4fb);border:1px solid var(--n200);border-radius:8px;font-size:13px;color:var(--blue);text-decoration:none;transition:.2s}
.tc-downlinks a:hover{background:var(--blue);color:#fff;border-color:var(--blue)}
@media(max-width:860px){.todesk-imggrid{gap:6px}.todesk-imggrid img{max-height:80px}.sm-grid{grid-template-columns:1fr 1fr}.wecom-card{flex-direction:column;text-align:center}}
@media(max-width:480px){.todesk-imggrid{gap:4px}.todesk-imggrid a{padding:6px;border-radius:10px}.todesk-imggrid img{max-height:64px}}
.proxy-guide{max-width:820px;margin:0 auto}
.guide-list{margin:6px 0 0;padding-left:20px;color:var(--n600,#475069);font-size:14px;line-height:1.8}
.guide-list li{margin:4px 0}
.guide-list code{background:var(--n100,#f2f4f7);padding:1px 6px;border-radius:5px;font-size:12.5px;color:var(--blue)}

/* ========== 帮助中心 help.html ========== */
.help-list{max-width:880px;margin:0 auto;display:flex;flex-direction:column;gap:14px}
.help-item{background:#fff;border:1px solid var(--n200);border-radius:var(--r-lg);box-shadow:var(--shadow);overflow:hidden;transition:.25s}
.help-item:hover{border-color:var(--blue)}
.help-item summary{list-style:none;cursor:pointer;padding:20px 24px;font-weight:700;font-size:17px;color:var(--n900);display:flex;align-items:center;justify-content:space-between;gap:12px}
.help-item summary::-webkit-details-marker{display:none}
.help-item summary::after{content:"+";font-size:24px;font-weight:400;color:var(--blue);flex-shrink:0;line-height:1;transition:.2s}
.help-item[open] summary::after{content:"\2212";font-size:26px}
.help-item summary:hover{color:var(--blue)}
.help-body{padding:4px 24px 26px;border-top:1px solid var(--n200);color:var(--n700);font-size:14px;line-height:1.75}
.help-body h4{font-size:16px;color:var(--n900);margin:18px 0 8px;font-family:"Noto Serif SC",serif}
.help-body ol.guide-list,.help-body ul.guide-list{margin:6px 0 4px}
.help-body .note{background:var(--n50);border-left:4px solid var(--orange);border-radius:10px;padding:12px 16px;margin:16px 0 0;font-size:13.5px;line-height:1.7}
.help-body .note b{color:var(--n900)}
.help-body a{color:var(--blue);font-weight:600}
.help-body a:hover{text-decoration:underline}
@media(max-width:600px){.help-item summary{font-size:15px;padding:16px 18px}.help-body{padding:4px 18px 22px}}
/* ========== 定制开发页 custom-dev.html ========== */
.cd-tw{overflow-x:auto;-webkit-overflow-scrolling:touch;border-radius:var(--r-lg)}
.cd-table{width:100%;min-width:720px;border-collapse:collapse;background:#fff;border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--shadow);font-size:14px}
.cd-table th,.cd-table td{padding:16px 18px;text-align:left;border-bottom:1px solid var(--n200);vertical-align:top;line-height:1.7}
.cd-table thead th{background:var(--grad);color:#fff;font-size:15px;font-weight:700;white-space:nowrap;border-bottom:0}
.cd-table tbody tr:last-child td{border-bottom:0}
.cd-table tbody tr:hover{background:var(--n50)}
.cd-table td:first-child{font-weight:700;color:var(--n900);white-space:nowrap}
.cd-table .cd-hl{color:var(--blue);font-weight:700;white-space:nowrap}

.cd-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.cd-step{background:#fff;border-radius:var(--r-lg);padding:24px 22px;box-shadow:var(--shadow);border-top:4px solid var(--blue);transition:.25s}
.cd-step:hover{transform:translateY(-4px);box-shadow:var(--shadow-h)}
.cd-step .cd-no{width:32px;height:32px;border-radius:9px;background:var(--grad);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px;margin-bottom:12px}
.cd-step h3{font-size:17px;margin-bottom:6px}
.cd-step p{color:var(--n500);font-size:13.5px;line-height:1.7}

.cd-stack{display:flex;flex-wrap:wrap;gap:10px;margin-top:6px}
.cd-chip{background:#fff;border:1px solid var(--n200);border-radius:10px;padding:9px 14px;font-size:13.5px;color:var(--n700);box-shadow:var(--shadow)}
.cd-chip b{color:var(--n900);font-weight:700}
@media(max-width:900px){.cd-steps{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.cd-steps{grid-template-columns:1fr}}
/* 帮助中心 · 跳转卡片 */
.help-card{display:flex;align-items:center;gap:16px;background:#fff;border:1px solid var(--n200);border-radius:var(--r-lg);box-shadow:var(--shadow);padding:18px 22px;transition:.25s;text-decoration:none;color:inherit}
.help-card:hover{border-color:var(--blue);transform:translateY(-3px);box-shadow:var(--shadow-h)}
.help-card .hc-no{flex-shrink:0;width:38px;height:38px;border-radius:10px;background:var(--grad);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:16px}
.help-card .hc-main{flex:1;min-width:0}
.help-card .hc-title{font-weight:700;font-size:16px;color:var(--n900)}
.help-card .hc-desc{font-size:13px;color:var(--n500);margin-top:2px}
.help-card .hc-arrow{flex-shrink:0;color:var(--blue);font-size:22px;font-weight:700}