/* 
  号多多 Official (Static) — handcrafted CSS
  Notes:
  - No external frameworks
  - Uses system font stack for speed and licensing simplicity
  - Designed for SEO + performance + accessibility
*/

:root{
  --bg: #070A10;
  --bg2:#0B1020;
  --card:#0D152B;
  --card2:#0B1326;
  --text:#EAF0FF;
  --muted:rgba(234,240,255,.72);
  --subtle:rgba(234,240,255,.12);
  --border:rgba(234,240,255,.14);
  --accent:#6EE7FF;
  --accent2:#A78BFA;
  --good:#34D399;
  --warn:#FBBF24;
  --danger:#FB7185;

  --shadow: 0 14px 50px rgba(0,0,0,.45);
  --shadow2: 0 10px 28px rgba(0,0,0,.35);

  --r-xl: 22px;
  --r-lg: 16px;
  --r-md: 12px;

  --max: 1140px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Microsoft YaHei", "Apple Color Emoji","Segoe UI Emoji";
  color:var(--text);
  background:
    radial-gradient(1200px 700px at 20% -10%, rgba(110,231,255,.18), transparent 55%),
    radial-gradient(1200px 700px at 85% 10%, rgba(167,139,250,.18), transparent 55%),
    radial-gradient(900px 650px at 55% 110%, rgba(52,211,153,.10), transparent 50%),
    linear-gradient(180deg, var(--bg), var(--bg2));
  line-height:1.65;
}

a{color:inherit; text-decoration:none}
a:hover{opacity:.95}
img{max-width:100%; height:auto; display:block}
svg{display:block}
::selection{background:rgba(110,231,255,.28)}
/* layout */
.container{max-width:var(--max); margin:0 auto; padding:0 18px}
.section{padding:84px 0}
.section-tight{padding:56px 0}
.grid{display:grid; gap:18px}
.row{display:flex; gap:18px; flex-wrap:wrap}
.center{text-align:center}
.right{text-align:right}
.hide{display:none !important}
.sr-only{position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); border:0}

/* header */
.site-header{
  position:sticky; top:0; z-index:50;
  background:rgba(7,10,16,.55);
  backdrop-filter: blur(10px);
  border-bottom:1px solid rgba(234,240,255,.08);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 0;
}
.brand{
  display:flex; align-items:center; gap:10px;
}
.brand-mark{
  width:34px; height:34px; border-radius:10px;
  display:block;
  object-fit:cover;
  box-shadow: 0 12px 30px rgba(110,231,255,.12), 0 12px 30px rgba(167,139,250,.10);
  border:1px solid rgba(234,240,255,.12);
}
.brand-name{
  font-weight:700; letter-spacing:.2px; font-size:15.5px;
}
.brand-sub{
  display:block;
  font-size:12px; color:var(--muted); font-weight:500; margin-top:-2px;
}

.nav-links{
  display:flex; align-items:center; gap:18px;
  font-size:14px; color:rgba(234,240,255,.80);
}
.nav-links a{
  padding:8px 10px;
  border-radius:12px;
  transition: background .2s ease, color .2s ease;
}
.nav-links a:hover{background:rgba(234,240,255,.06)}
.nav-cta{
  display:flex; align-items:center; gap:10px;
}
.btn{
  display:inline-flex; align-items:center; justify-content:center;
  gap:10px;
  padding:11px 14px;
  border-radius:14px;
  border:1px solid rgba(234,240,255,.14);
  background:rgba(234,240,255,.04);
  color:rgba(234,240,255,.92);
  font-size:14px;
  box-shadow: none;
  transition: transform .15s ease, background .2s ease, border-color .2s ease, box-shadow .2s ease;
  cursor:pointer;
}
.btn:hover{
  transform: translateY(-1px);
  background:rgba(234,240,255,.06);
  border-color:rgba(234,240,255,.18);
  box-shadow: 0 18px 50px rgba(0,0,0,.35);
}
.btn:active{transform: translateY(0px)}
.btn-primary{
  border:1px solid rgba(110,231,255,.22);
  background: linear-gradient(135deg, rgba(110,231,255,.18), rgba(167,139,250,.14));
  box-shadow: 0 18px 70px rgba(110,231,255,.10), 0 18px 70px rgba(167,139,250,.08);
}
.btn-primary:hover{
  border-color:rgba(110,231,255,.30);
  box-shadow: 0 22px 85px rgba(110,231,255,.14), 0 22px 85px rgba(167,139,250,.10);
}
.btn-ghost{
  background:transparent;
  border:1px solid rgba(234,240,255,.12);
}
.badge{
  display:inline-flex; align-items:center; gap:8px;
  padding:6px 10px;
  border-radius:999px;
  border:1px solid rgba(234,240,255,.14);
  background:rgba(234,240,255,.04);
  color:rgba(234,240,255,.86);
  font-size:12px;
}
.badge-dot{width:7px; height:7px; border-radius:50%; background:var(--good); box-shadow:0 0 0 4px rgba(52,211,153,.12)}

/* hero */
.hero{
  padding:70px 0 40px;
}
.hero-grid{
  display:grid;
  grid-template-columns: 1.15fr .85fr;
  gap:26px;
  align-items:center;
}
.h1{
  font-size:46px;
  line-height:1.08;
  margin:10px 0 14px;
  letter-spacing:-.6px;
}
.lead{
  font-size:16.5px;
  color:rgba(234,240,255,.78);
  max-width:54ch;
}
.hero-actions{margin-top:22px; display:flex; gap:12px; flex-wrap:wrap}
.hero-note{margin-top:14px; color:rgba(234,240,255,.65); font-size:13px}

.hero-card{
  border:1px solid rgba(234,240,255,.12);
  border-radius: var(--r-xl);
  background:
    radial-gradient(600px 320px at 20% 0%, rgba(110,231,255,.14), transparent 60%),
    radial-gradient(700px 380px at 85% 10%, rgba(167,139,250,.12), transparent 55%),
    linear-gradient(180deg, rgba(13,21,43,.75), rgba(11,19,38,.72));
  box-shadow: var(--shadow);
  overflow:hidden;
  position:relative;
  padding:20px;
}
.hero-illus{
  border-radius:18px;
  border:1px solid rgba(234,240,255,.12);
  background:linear-gradient(180deg, rgba(234,240,255,.04), rgba(234,240,255,.02));
  padding:14px;
}
.stat-row{display:grid; grid-template-columns:1fr 1fr; gap:10px; margin-top:14px}
.stat{
  border:1px solid rgba(234,240,255,.12);
  background:rgba(234,240,255,.03);
  border-radius:16px;
  padding:12px 12px;
}
.stat .k{font-size:12px; color:rgba(234,240,255,.66)}
.stat .v{font-size:18px; font-weight:700; margin-top:4px; letter-spacing:.2px}

.kpi{
  display:flex; flex-wrap:wrap; gap:10px; margin-top:18px
}
.kpi .badge{background:rgba(234,240,255,.03)}
.kpi strong{color:rgba(234,240,255,.94)}

/* cards */
.card{
  border:1px solid rgba(234,240,255,.12);
  border-radius: var(--r-xl);
  background:linear-gradient(180deg, rgba(234,240,255,.04), rgba(234,240,255,.02));
  box-shadow: var(--shadow2);
}
.card-pad{padding:22px}
.card-title{font-size:18px; margin:0 0 8px; letter-spacing:-.2px}
.card-text{margin:0; color:rgba(234,240,255,.74); font-size:14px}
.card-icon{
  width:42px; height:42px; border-radius:14px;
  border:1px solid rgba(234,240,255,.14);
  background:
    radial-gradient(22px 22px at 30% 30%, rgba(110,231,255,.35), rgba(110,231,255,.05)),
    radial-gradient(24px 24px at 75% 70%, rgba(167,139,250,.30), rgba(167,139,250,.05)),
    rgba(234,240,255,.03);
  display:flex; align-items:center; justify-content:center;
  margin-bottom:12px;
}

/* section headings */
.eyebrow{
  color:rgba(110,231,255,.85);
  font-weight:700;
  letter-spacing:.12em;
  font-size:12px;
  text-transform:uppercase;
}
.h2{
  margin:10px 0 12px;
  font-size:30px;
  letter-spacing:-.4px;
}
.p{
  margin:0;
  color:rgba(234,240,255,.74);
  max-width:78ch;
}

/* feature grid */
.feature-grid{
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.feature-grid .card{height:100%}

/* category tiles */
.tiles{
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.tile{
  position:relative;
  overflow:hidden;
}
.tile::before{
  content:"";
  position:absolute; inset:-2px;
  background: radial-gradient(120px 120px at 30% 20%, rgba(110,231,255,.12), transparent 60%),
              radial-gradient(140px 140px at 85% 70%, rgba(167,139,250,.12), transparent 55%);
  opacity:.9;
}
.tile .card-pad{position:relative}
.tile .tag{
  margin-top:10px;
  display:inline-flex;
  font-size:12px;
  color:rgba(234,240,255,.72);
  border:1px solid rgba(234,240,255,.12);
  border-radius:999px;
  padding:6px 10px;
  background:rgba(234,240,255,.03);
}

/* steps */
.steps{
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.step-num{
  width:34px; height:34px;
  border-radius:12px;
  display:flex; align-items:center; justify-content:center;
  font-weight:800;
  border:1px solid rgba(110,231,255,.22);
  background:rgba(110,231,255,.08);
  color:rgba(234,240,255,.92);
  margin-bottom:10px;
}

/* quotes */
.quote{
  border-left:2px solid rgba(110,231,255,.40);
  padding-left:14px;
  margin:0;
  color:rgba(234,240,255,.74);
}
.quote strong{color:rgba(234,240,255,.95)}

/* faq */
.faq{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap:14px;
}
.faq-item{
  border:1px solid rgba(234,240,255,.12);
  border-radius:16px;
  background:rgba(234,240,255,.03);
  overflow:hidden;
}
.faq-q{
  width:100%;
  text-align:left;
  background:transparent;
  border:0;
  color:rgba(234,240,255,.92);
  padding:14px 14px;
  display:flex;
  justify-content:space-between;
  align-items:center;
  font-size:14px;
  cursor:pointer;
}
.faq-a{
  padding:0 14px 14px;
  color:rgba(234,240,255,.72);
  font-size:13.5px;
  display:none;
}
.faq-item[data-open="1"] .faq-a{display:block}
.chev{
  width:18px; height:18px;
  border-radius:8px;
  border:1px solid rgba(234,240,255,.16);
  display:flex; align-items:center; justify-content:center;
  background:rgba(234,240,255,.02);
}

/* footer */
.site-footer{
  border-top:1px solid rgba(234,240,255,.08);
  padding:42px 0 30px;
  background:rgba(7,10,16,.30);
}
.footer-grid{
  display:grid;
  grid-template-columns: 1.2fr .9fr .9fr;
  gap:18px;
}
.footer-title{font-size:14px; margin:0 0 8px; color:rgba(234,240,255,.92)}
.footer-links{display:grid; gap:8px}
.footer-links a{color:rgba(234,240,255,.70); font-size:13.5px}
.footer-links a:hover{color:rgba(234,240,255,.90)}
.tiny{color:rgba(234,240,255,.55); font-size:12.5px; margin:12px 0 0}
.hr{height:1px; background:rgba(234,240,255,.08); margin:18px 0}

/* page hero */
.page-hero{
  padding:44px 0 20px;
}
.breadcrumbs{
  font-size:12.5px; color:rgba(234,240,255,.62)
}
.breadcrumbs a{color:rgba(234,240,255,.76)}
.page-title{font-size:34px; margin:10px 0 10px; letter-spacing:-.4px}
.page-sub{color:rgba(234,240,255,.74); max-width:78ch}

/* blog list */
.blog-list{grid-template-columns: repeat(3, minmax(0, 1fr))}
.meta{font-size:12.5px; color:rgba(234,240,255,.62); margin-top:10px}

/* forms */
.form{
  display:grid; gap:12px;
}
.input, .textarea{
  width:100%;
  border-radius:14px;
  padding:12px 12px;
  border:1px solid rgba(234,240,255,.14);
  background:rgba(234,240,255,.03);
  color:rgba(234,240,255,.92);
  outline:none;
}
.textarea{min-height:120px; resize:vertical}
.label{font-size:13px; color:rgba(234,240,255,.72)}
/* utility */
.split{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap:18px;
}
.list{
  margin:0; padding-left:18px;
  color:rgba(234,240,255,.74);
}
.list li{margin:7px 0}

/* responsive */
.burger{display:none}
.mobile-panel{display:none}

@media (max-width: 980px){
  .hero-grid{grid-template-columns: 1fr}
  .h1{font-size:40px}
  .feature-grid{grid-template-columns: 1fr 1fr}
  .tiles{grid-template-columns: 1fr 1fr}
  .steps{grid-template-columns: 1fr}
  .faq{grid-template-columns: 1fr}
  .footer-grid{grid-template-columns: 1fr}
  .blog-list{grid-template-columns: 1fr}
  .split{grid-template-columns: 1fr}
  .nav-links{display:none}
  .burger{
    display:inline-flex;
    width:42px; height:42px;
    align-items:center; justify-content:center;
  }
  .mobile-panel{
    display:none;
    padding:10px 0 16px;
  }
  .mobile-panel[data-open="1"]{display:block}
  .mobile-panel a{
    display:block;
    padding:10px 10px;
    border-radius:14px;
    color:rgba(234,240,255,.82);
  }
  .mobile-panel a:hover{background:rgba(234,240,255,.06)}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .btn{transition:none}
}

/* accessibility: skip link */
.skip-link{
  position:absolute;
  left:-999px;
  top:10px;
  padding:10px 12px;
  background:rgba(234,240,255,.94);
  color:#070A10;
  border-radius:12px;
  z-index:9999;
  box-shadow:0 10px 30px rgba(0,0,0,.25);
}
.skip-link:focus{
  left:14px;
  outline:none;
}

/* code block (for contact template / docs) */
.codeblock{
  margin:10px 0 0;
  padding:14px 14px;
  border-radius:16px;
  border:1px solid rgba(234,240,255,.14);
  background:rgba(13,21,43,.55);
  color:rgba(234,240,255,.92);
  overflow:auto;
  white-space:pre-wrap;
  word-break:break-word;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size:13px;
  line-height:1.55;
}