/* ===== 恒枢云SCDN 官网 · 极简 · 全页粒子 + 毛玻璃 ===== */
:root{
  --primary:#2f6bff;
  --primary-d:#1e57e6;
  --primary-soft:#e9f0ff;
  --ink:#0f1b33;
  --text:#4b5565;
  --muted:#8a94a6;
  --border:#e8edf5;
  --border-2:#dfe6f1;
  --glass:rgba(255,255,255,.58);
  --glass-line:rgba(255,255,255,.75);
  --shadow:0 16px 40px -20px rgba(24,52,110,.26);
  --shadow-lg:0 28px 64px -26px rgba(24,52,110,.32);
  --radius:18px;
  --wrap:1160px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei","Hiragino Sans GB",Roboto,Helvetica,Arial,sans-serif;
  font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:clip;
  background:linear-gradient(180deg,#eaf1ff 0,#f3f8ff 26%,#eef4ff 62%,#e7f0ff 100%);
  background-attachment:fixed}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{color:var(--ink);margin:0;line-height:1.25;letter-spacing:-.01em}
img,svg{max-width:100%}
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 24px}

/* 全页粒子画布（固定，铺满，位于内容之下） */
#bg-canvas{position:fixed;inset:0;z-index:0;pointer-events:none}

/* 内容层级：都浮在粒子之上 */
.site-header{position:sticky;top:0;z-index:50}
.hero,.section,.cta,.footer{position:relative;z-index:1}

/* 毛玻璃通用 */
.glass{
  background:var(--glass);
  -webkit-backdrop-filter:blur(16px) saturate(1.5);
  backdrop-filter:blur(16px) saturate(1.5);
  border:1px solid var(--glass-line);
  box-shadow:var(--shadow);
}

/* ===== 按钮 ===== */
.btn{display:inline-flex;align-items:center;gap:7px;justify-content:center;border-radius:12px;font-weight:600;cursor:pointer;border:1px solid transparent;transition:transform .18s ease,box-shadow .22s ease,background .18s ease,border-color .18s ease,color .18s ease;white-space:nowrap}
.btn svg{transition:transform .18s ease}
.btn-sm{padding:8px 15px;font-size:14px}
.btn-lg{padding:13px 26px;font-size:15.5px}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 12px 24px -10px rgba(47,107,255,.6)}
.btn-primary:hover{background:var(--primary-d);transform:translateY(-2px);box-shadow:0 18px 30px -12px rgba(47,107,255,.55)}
.btn-primary:hover svg{transform:translateX(3px)}
.btn-soft{background:rgba(255,255,255,.65);color:#3d4757;border-color:var(--glass-line);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}
.btn-soft:hover{background:#fff;color:var(--primary);border-color:#cfe0ff;transform:translateY(-2px)}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--border-2)}
.btn-ghost:hover{border-color:var(--primary);color:var(--primary)}
.btn-line{background:transparent;color:#fff;border-color:rgba(255,255,255,.55)}
.btn-line:hover{background:rgba(255,255,255,.12);transform:translateY(-2px)}

/* ===== 导航 ===== */
.site-header{background:transparent;border-bottom:1px solid transparent;transition:background .25s ease,border-color .25s ease,box-shadow .25s ease}
.site-header.scrolled{background:rgba(255,255,255,.72);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border-color:var(--border);box-shadow:0 6px 24px -18px rgba(24,52,110,.5)}
/* 菜单展开时顶栏也变白, 和下拉面板融成一块整白面板(否则顶部还透明, 很割裂) */
.site-header.nav-open{background:rgba(255,255,255,.95);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border-color:var(--border)}
.nav-wrap{display:flex;align-items:center;gap:16px;height:72px}
.brand{display:inline-flex;align-items:center;gap:9px}
.logo{width:29px;height:29px}
.brand-name{font-size:19px;font-weight:800;color:var(--ink)}
.brand-name b{color:var(--primary)}
.nav-links{flex:1;display:flex;justify-content:center;gap:32px}
.nav-links a{font-size:15px;color:#465266;font-weight:500;position:relative;padding:4px 0;transition:color .18s ease}
.nav-links a::after{content:"";position:absolute;left:0;right:100%;bottom:-3px;height:2px;background:var(--primary);border-radius:2px;transition:right .25s ease}
.nav-links a:hover{color:var(--primary)}
.nav-links a:hover::after{right:0}
.nav-actions{display:flex;align-items:center;gap:14px;margin-left:auto}
.login{font-size:15px;font-weight:600;color:var(--ink)}
.login:hover{color:var(--primary)}
.lang{display:inline-flex;align-items:center;gap:5px;font-size:13px;font-weight:600;color:var(--ink);background:rgba(255,255,255,.7);border:1px solid var(--border-2);border-radius:999px;padding:6px 12px;cursor:pointer;transition:.18s}
.lang:hover{border-color:var(--primary);color:var(--primary)}
.lang svg{width:15px;height:15px}
.menu-toggle{display:none;width:40px;height:40px;border:1px solid var(--border-2);background:rgba(255,255,255,.7);border-radius:10px;color:var(--ink);cursor:pointer;align-items:center;justify-content:center}
.menu-toggle svg{width:22px;height:22px}
.mobile-nav{display:none;position:absolute;left:0;right:0;top:100%;flex-direction:column;padding:8px 24px 18px;background:rgba(255,255,255,.95);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border-bottom:1px solid var(--border);box-shadow:0 20px 44px -26px rgba(24,52,110,.55)}
.mobile-nav.open{display:flex}
.mobile-nav a{padding:12px 4px;font-size:15px;font-weight:500;color:var(--ink);border-bottom:1px solid rgba(0,0,0,.04)}
.mobile-nav-row{display:flex;gap:10px;margin-top:14px}
.mobile-nav-row .btn{flex:1}

/* ===== HERO（全屏居中） ===== */
.hero{min-height:100vh;display:grid;grid-template-rows:1fr auto;padding:96px 24px 96px;margin-top:-72px}
.hero-inner{align-self:center;justify-self:center;text-align:center;max-width:920px;width:100%;padding-top:52px}
.hero-eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13.5px;font-weight:600;color:var(--primary);background:rgba(255,255,255,.65);border:1px solid var(--glass-line);padding:7px 16px;border-radius:999px;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}
.hero-eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--primary);box-shadow:0 0 0 4px rgba(47,107,255,.16);animation:blink 2.4s ease-in-out infinite}
@keyframes blink{0%,100%{opacity:1}50%{opacity:.35}}
.hero-title{font-size:clamp(30px,5.2vw,56px);font-weight:800;letter-spacing:-.02em;color:var(--ink);line-height:1.16;margin:26px 0 0}
.hero-title .ht-sep{color:var(--primary)}
.hero-sub{font-size:clamp(15px,1.7vw,19px);color:#54606f;max-width:680px;margin:24px auto 0;line-height:1.75}
.hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:38px}
.demo-hint{margin-top:22px;font-size:13.5px;color:var(--muted)}
.demo-hint code{font-family:Consolas,Menlo,monospace;background:rgba(255,255,255,.7);border:1px solid var(--border);border-radius:8px;padding:3px 10px;color:var(--ink);font-weight:600}
.hero-stats{justify-self:center;width:100%;max-width:900px;display:grid;grid-template-columns:repeat(4,1fr);gap:8px;border-radius:20px;padding:28px 16px}
.hs{text-align:center;position:relative}
.hs:not(:last-child)::after{content:"";position:absolute;right:-4px;top:16%;height:68%;width:1px;background:rgba(120,140,180,.18)}
.hs b{display:block;font-size:34px;font-weight:800;color:var(--ink);letter-spacing:-.02em;line-height:1}
.hs span{display:block;font-size:13.5px;color:var(--muted);margin-top:8px}

/* ===== 渐入 ===== */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .72s cubic-bezier(.16,1,.3,1),transform .72s cubic-bezier(.16,1,.3,1);transition-delay:var(--d,0s)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}

/* ===== 区块 ===== */
.section{padding:104px 0}
.section-head{max-width:640px}
.section-head.center{margin:0 auto;text-align:center}
.tag{display:inline-block;font-size:13px;font-weight:700;color:var(--primary);background:var(--primary-soft);padding:5px 14px;border-radius:999px}
.section-head h2{font-size:34px;margin:16px 0 12px;font-weight:800}
.section-head .sub{font-size:16px;color:var(--muted);margin:0;line-height:1.7}

/* ===== 卡片 ===== */
.cards-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:56px}
.cards-4{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:56px}
.card,.why-card{border-radius:var(--radius);padding:30px 28px;transition:transform .24s ease,box-shadow .24s ease}
.card:hover,.why-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.c-ic,.w-ic{width:52px;height:52px;border-radius:14px;display:inline-flex;align-items:center;justify-content:center;background:var(--primary-soft);color:var(--primary);margin-bottom:18px;transition:background .24s,color .24s}
.card:hover .c-ic,.why-card:hover .w-ic{background:var(--primary);color:#fff}
.c-ic svg,.w-ic svg{width:27px;height:27px}
.card h3,.why-card h3{font-size:19px;margin-bottom:8px;font-weight:700}
.card p,.why-card p{font-size:14.5px;color:var(--text);line-height:1.7;margin:0}

/* ===== 场景 ===== */
.scenes{display:grid;grid-template-columns:repeat(6,1fr);gap:20px;margin-top:56px}
.scene{text-align:center;border-radius:var(--radius);padding:30px 12px;transition:transform .24s ease,box-shadow .24s ease}
.scene:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.s-ic{width:50px;height:50px;border-radius:15px;display:inline-flex;align-items:center;justify-content:center;background:var(--primary-soft);color:var(--primary);margin-bottom:12px}
.s-ic svg{width:27px;height:27px}
.scene h3{font-size:16px;margin:0}

/* ===== 接入流程 ===== */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:56px}
.step{border-radius:var(--radius);padding:28px 24px;text-align:left;transition:transform .24s ease,box-shadow .24s ease}
.step:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.st-n{width:44px;height:44px;border-radius:12px;background:var(--primary);color:#fff;font-size:18px;font-weight:800;display:inline-flex;align-items:center;justify-content:center;box-shadow:0 10px 20px -8px rgba(47,107,255,.6);margin-bottom:16px}
.step h3{font-size:17px;margin-bottom:7px}
.step p{font-size:13.5px;color:var(--muted);margin:0;line-height:1.7}

/* ===== CTA ===== */
.cta{padding:24px 0 104px}
.cta-band{position:relative;overflow:hidden;text-align:center;background:linear-gradient(135deg,#1e57e6,#2f6bff 55%,#5b8cff);border-radius:26px;padding:66px 32px;color:#fff;box-shadow:0 28px 64px -26px rgba(47,107,255,.7)}
.cta-band::before{content:"";position:absolute;inset:0;background:radial-gradient(500px 240px at 82% 0%,rgba(255,255,255,.2),transparent 60%);pointer-events:none}
.cta-band h2{color:#fff;font-size:32px;font-weight:800;margin-bottom:12px}
.cta-band p{color:rgba(255,255,255,.92);font-size:16px;max-width:520px;margin:0 auto 28px}
.cta-btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;position:relative}
.cta-btns .btn-primary{background:#fff;color:var(--primary-d);box-shadow:0 10px 24px -8px rgba(0,0,0,.3)}
.cta-btns .btn-primary:hover{background:#eef4ff;color:var(--primary-d)}

/* ===== 页脚 ===== */
.footer{background:#0d1526;color:#aab4c5;padding:56px 0 26px}
.footer-grid{display:grid;grid-template-columns:1.8fr 1fr 1fr 1fr;gap:40px}
.footer .brand-name{color:#fff}
.footer .brand-name b{color:#7fb0ff}
.f-brand p{font-size:14px;color:#8592a6;margin:16px 0 0;line-height:1.7;max-width:300px}
.f-col h4{color:#fff;font-size:15px;margin-bottom:16px}
.f-col a{display:block;font-size:14px;color:#8592a6;padding:6px 0;transition:color .18s ease}
.f-col a:hover{color:#fff}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;margin-top:40px;padding-top:22px;border-top:1px solid rgba(255,255,255,.08);font-size:13px;color:#6b7789}

/* ===== 响应式 ===== */
@media (max-width:1000px){
  .nav-links{display:none}
  .menu-toggle{display:inline-flex}
  .login,.lang{display:none}
  .cards-3{grid-template-columns:repeat(2,1fr)}
  .cards-4{grid-template-columns:repeat(2,1fr)}
  .scenes{grid-template-columns:repeat(3,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:680px){
  .section{padding:72px 0}
  .hero{padding:84px 20px 80px}
  .hero-inner{padding-top:16px}
  .section-head h2{font-size:26px}
  .hero-stats{grid-template-columns:repeat(2,1fr);gap:20px 8px;padding:24px 12px}
  .hs:nth-child(2)::after{display:none}
  .hs b{font-size:28px}
  .hero-cta .btn{flex:1 1 44%}
  .cards-3,.cards-4{grid-template-columns:1fr}
  .scenes{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:1fr}
  .cta-band{padding:44px 22px}
  .cta-band h2{font-size:25px}
  .footer-grid{grid-template-columns:1fr;gap:28px}
}
@media (max-width:400px){
  .hs b{font-size:25px}
  .hero-cta .btn{flex:1 1 100%}
}