/* =========================================================
   SITE · ronganbaowz.com · 靛蓝清透 · 青柠点缀
   Palette: indigo / periwinkle / lime accent
   Type:    geometric sans · radius 20px
   FX:      ambient orbs · grid mesh · floating cards
   ========================================================= */

:root{
  --ra-bg:#f5f7fc;
  --ra-surface:#ffffff;
  --ra-ink:#0e1a3a;
  --ra-primary:#2b4ee6;
  --ra-primary2:#5b7cfa;
  --ra-lime:#8fd63f;
  --ra-muted:#6b7899;
  --ra-line:#e2e8f6;
  --ra-radius:20px;
  --ra-shadow:0 18px 40px rgba(43,78,230,.13);
  --ra-maxw:1150px;
  --ra-font:"PingFang SC","Microsoft YaHei","Segoe UI",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{font-family:var(--ra-font);color:var(--ra-ink);background:var(--ra-bg);line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden;}
a{color:inherit;text-decoration:none;}
::selection{background:var(--ra-primary);color:#fff;}
.ra-wrap{max-width:var(--ra-maxw);margin:0 auto;padding:0 28px;}

/* ambient background */
.ra-bg{position:fixed;inset:0;z-index:-1;pointer-events:none;overflow:hidden;}
.ra-orb{position:absolute;border-radius:50%;filter:blur(70px);}
.ra-orb-a{width:520px;height:520px;top:-180px;right:-140px;background:radial-gradient(circle,rgba(91,124,250,.34),transparent 68%);}
.ra-orb-b{width:440px;height:440px;bottom:-160px;left:-120px;background:radial-gradient(circle,rgba(143,214,63,.26),transparent 68%);}
.ra-grid{position:absolute;inset:0;background-image:linear-gradient(rgba(43,78,230,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(43,78,230,.045) 1px,transparent 1px);background-size:56px 56px;mask-image:radial-gradient(circle at 50% 20%,#000 20%,transparent 78%);-webkit-mask-image:radial-gradient(circle at 50% 20%,#000 20%,transparent 78%);}

/* header */
.ra-head{position:sticky;top:0;z-index:120;background:rgba(245,247,252,.82);backdrop-filter:blur(14px);border-bottom:1px solid var(--ra-line);}
.ra-bar{max-width:var(--ra-maxw);margin:0 auto;padding:13px 28px;display:flex;align-items:center;justify-content:space-between;gap:24px;}
.ra-brand{display:flex;align-items:center;gap:11px;}
.ra-mark{width:38px;height:38px;border-radius:12px;background:linear-gradient(135deg,var(--ra-primary),var(--ra-lime));color:#fff;display:grid;place-items:center;font-weight:700;font-size:17px;box-shadow:0 8px 18px rgba(43,78,230,.28);}
.ra-brandtext{font-size:15px;font-weight:700;display:flex;flex-direction:column;line-height:1.1;}
.ra-brandtext em{font-style:normal;font-size:9px;letter-spacing:.2em;color:var(--ra-muted);}
.ra-nav{display:flex;align-items:center;gap:24px;}
.ra-nav a{font-size:14px;color:var(--ra-ink);transition:.18s;}
.ra-nav a:not(.ra-nav-cta):hover{color:var(--ra-primary);}
.ra-nav-cta{background:var(--ra-primary);color:#fff;padding:8px 18px;border-radius:999px;font-weight:600;box-shadow:0 8px 18px rgba(43,78,230,.26);}
.ra-nav-cta:hover{background:var(--ra-primary2);}
.ra-burger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px;}
.ra-burger span{width:24px;height:2px;background:var(--ra-ink);transition:.2s;}

/* hero */
.ra-hero{position:relative;padding:92px 0 84px;}
.ra-hero-grid{display:grid;grid-template-columns:1.12fr .88fr;gap:56px;align-items:center;}
.ra-tag{display:inline-block;font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--ra-primary);background:var(--ra-surface);border:1px solid var(--ra-line);padding:6px 15px;border-radius:999px;}
.ra-h1{font-size:clamp(38px,5.4vw,68px);line-height:1.06;font-weight:800;letter-spacing:-.02em;margin:22px 0 18px;}
.ra-h1::after{content:"";display:block;width:88px;height:5px;margin-top:20px;border-radius:3px;background:linear-gradient(90deg,var(--ra-primary),var(--ra-lime));}
.ra-lead{font-size:17px;color:var(--ra-muted);max-width:48ch;}
.ra-cta{display:flex;gap:14px;margin-top:32px;flex-wrap:wrap;}
.ra-btn{padding:14px 28px;border-radius:999px;font-size:14px;font-weight:600;transition:.2s;}
.ra-btn-solid{background:var(--ra-primary);color:#fff;box-shadow:0 14px 30px rgba(43,78,230,.3);}
.ra-btn-solid:hover{background:var(--ra-primary2);transform:translateY(-2px);}
.ra-btn-ghost{border:1px solid var(--ra-line);color:var(--ra-ink);background:rgba(255,255,255,.6);}
.ra-btn-ghost:hover{border-color:var(--ra-primary);color:var(--ra-primary);}
.ra-floatcard{background:rgba(255,255,255,.86);backdrop-filter:blur(10px);border:1px solid var(--ra-line);border-radius:var(--ra-radius);padding:28px;box-shadow:var(--ra-shadow);}
.ra-fc-row{display:flex;justify-content:space-between;align-items:baseline;padding:16px 0;border-bottom:1px solid var(--ra-line);}
.ra-fc-row span{font-size:14px;color:var(--ra-muted);}
.ra-fc-row b{font-size:26px;font-weight:800;background:linear-gradient(135deg,var(--ra-primary),var(--ra-primary2));-webkit-background-clip:text;background-clip:text;color:transparent;}
.ra-fc-foot{margin-top:18px;text-align:center;font-size:13px;letter-spacing:.1em;color:var(--ra-primary);}

/* sections */
.ra-sec{padding:82px 0;border-bottom:1px solid var(--ra-line);}
.ra-sec-alt{background:rgba(255,255,255,.62);}
.ra-sec-head{display:flex;align-items:baseline;gap:14px;margin-bottom:18px;}
.ra-kicker{font-size:11px;font-weight:700;letter-spacing:.24em;color:var(--ra-primary);background:var(--ra-surface);border:1px solid var(--ra-line);padding:4px 10px;border-radius:999px;}
.ra-sec-head h2{font-size:clamp(24px,3vw,36px);font-weight:800;letter-spacing:-.01em;}
.ra-lead-c{font-size:16px;color:var(--ra-muted);max-width:60ch;margin-bottom:34px;}

/* cards */
.ra-cards2{display:grid;grid-template-columns:1fr 1fr;gap:22px;}
.ra-grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.ra-grid5{display:grid;grid-template-columns:repeat(5,1fr);gap:18px;}
.ra-card{background:var(--ra-surface);border:1px solid var(--ra-line);border-radius:var(--ra-radius);padding:28px 22px;transition:transform .25s,box-shadow .25s,border-color .25s;}
.ra-float:hover{transform:translateY(-8px);box-shadow:var(--ra-shadow);border-color:rgba(43,78,230,.45);}
.ra-emo{display:inline-grid;place-items:center;width:46px;height:46px;border-radius:14px;background:linear-gradient(135deg,rgba(43,78,230,.1),rgba(143,214,63,.18));color:var(--ra-primary);font-size:20px;margin-bottom:14px;}
.ra-idx{display:inline-block;font-size:12px;font-weight:800;color:var(--ra-primary);letter-spacing:.1em;margin-bottom:12px;padding:3px 9px;border-radius:6px;background:rgba(43,78,230,.08);}
.ra-card h3{font-size:18px;margin-bottom:8px;font-weight:700;}
.ra-card p{font-size:14px;color:var(--ra-muted);}

/* steps */
.ra-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.ra-step{background:var(--ra-surface);border:1px solid var(--ra-line);border-radius:var(--ra-radius);padding:28px 20px;}
.ra-step-no{font-size:12px;font-weight:800;color:var(--ra-primary);letter-spacing:.1em;padding:3px 9px;border-radius:6px;background:rgba(43,78,230,.08);}
.ra-step b{display:block;font-size:21px;margin:14px 0 8px;font-weight:800;}
.ra-step span{font-size:13px;color:var(--ra-muted);}

/* faq */
.ra-faq{display:flex;flex-direction:column;gap:14px;}
.ra-item{background:var(--ra-surface);border:1px solid var(--ra-line);border-radius:var(--ra-radius);overflow:hidden;transition:border-color .2s;}
.ra-item[open]{border-color:rgba(43,78,230,.4);}
.ra-item summary{list-style:none;cursor:pointer;padding:20px 26px;font-size:16px;font-weight:600;display:flex;justify-content:space-between;align-items:center;}
.ra-item summary::-webkit-details-marker{display:none;}
.ra-chev{font-style:normal;font-size:22px;color:var(--ra-primary);transition:transform .2s;}
.ra-item[open] .ra-chev{transform:rotate(45deg);}
.ra-item p{padding:0 26px 22px;font-size:14px;color:var(--ra-muted);}

/* notice */
.ra-notice{margin-top:26px;font-size:12px;color:var(--ra-muted);border-left:3px solid var(--ra-primary);padding-left:14px;max-width:70ch;}

/* footer */
.ra-foot{border-top:1px solid var(--ra-line);padding:42px 0 60px;background:rgba(255,255,255,.72);}
.ra-foot-in{display:flex;flex-direction:column;gap:12px;}
.ra-foot-l{font-size:13px;font-weight:700;}
.ra-foot-r{font-size:12px;color:var(--ra-muted);}
.ra-foot-r a{color:var(--ra-primary);border-bottom:1px solid var(--ra-primary);}
.ra-foot-r a:hover{color:var(--ra-primary2);}

/* back top */
.ra-top{position:fixed;right:24px;bottom:24px;width:44px;height:44px;border-radius:50%;background:var(--ra-primary);color:#fff;display:grid;place-items:center;opacity:0;pointer-events:none;transition:.2s;z-index:130;box-shadow:0 12px 26px rgba(43,78,230,.32);}
.ra-top.show{opacity:1;pointer-events:auto;}
.ra-top:hover{background:var(--ra-primary2);}

/* reveal */
.ra-reveal{opacity:0;transform:translateY(20px);transition:opacity .5s ease,transform .5s ease;}
.ra-reveal.in{opacity:1;transform:none;}

@media(max-width:1024px){
  .ra-hero-grid{grid-template-columns:1fr;gap:40px;}
  .ra-grid4{grid-template-columns:repeat(2,1fr);}
  .ra-grid5{grid-template-columns:repeat(3,1fr);}
  .ra-steps{grid-template-columns:repeat(2,1fr);}
  .ra-cards2{grid-template-columns:1fr;}
}
@media(max-width:680px){
  .ra-wrap{padding:0 18px;}
  .ra-bar{padding:12px 18px;}
  .ra-nav{position:fixed;top:64px;left:0;right:0;flex-direction:column;align-items:stretch;gap:0;background:var(--ra-surface);border-bottom:1px solid var(--ra-line);max-height:0;overflow:hidden;transition:max-height .25s ease;z-index:110;}
  .ra-nav.open{max-height:340px;}
  .ra-nav a{padding:15px 18px;border-bottom:1px solid var(--ra-line);}
  .ra-burger{display:flex;}
  .ra-hero{padding:54px 0 46px;}
  .ra-sec{padding:54px 0;}
  .ra-grid4,.ra-grid5,.ra-steps{grid-template-columns:1fr;}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  .ra-reveal{opacity:1;transform:none;transition:none;}
  .ra-float:hover{transform:none;}
}