/* ============================================================================
   Engineering-basis / "what it does" description blocks (calculator & tool pages)
   ONE subtle frame around the whole descriptive text that sits OUTSIDE the
   interactive calculator. Activated by the .rb-eb class on the <section>.
   (No per-bullet or per-part framing — a single nicely framed description.)
   ========================================================================== */
.rb-eb{padding:2.4rem 0}
.rb-eb .container{max-width:1000px}
.rb-eb .section-header{margin-bottom:1.2rem !important}
.rb-eb .section-label{color:#00529b}
.rb-eb h2.section-title{font-size:1.5rem;line-height:1.25}

/* single frame around the whole description */
.rb-eb .container > div:last-child{
  max-width:900px;margin:0 auto !important;
  background:#fff;border:1px solid #e2e8f0;border-radius:14px;
  padding:24px 28px !important;
  box-shadow:0 1px 2px rgba(10,37,64,.05),0 10px 30px rgba(10,37,64,.06)}
@media(max-width:600px){.rb-eb .container > div:last-child{padding:18px 18px !important}}

/* headings inside the frame */
.rb-eb h3{font-size:1.05rem !important;color:#0a2540 !important;font-weight:700;
  margin:1.6rem 0 .6rem !important;display:flex;align-items:center;gap:8px}
.rb-eb h3::before{content:"";flex:0 0 auto;width:4px;height:18px;background:#00529b;border-radius:3px}

/* normal text + simple bullet list (NOT cards) */
.rb-eb p{line-height:1.72;color:#28384a}
.rb-eb ul{margin:.3rem 0 0 !important;padding-left:1.2rem !important;
  display:block !important;grid-template-columns:none !important}
.rb-eb ul li{margin:0 0 .5rem;line-height:1.6;color:#28384a;
  background:none !important;border:0 !important;border-radius:0 !important;
  padding:0 !important;box-shadow:none !important;list-style:disc !important}
.rb-eb ul li b,.rb-eb ul li strong{color:#0a2540}

/* closing rigor / disclaimer line — subtle, not boxed */
.rb-eb .container > div:last-child > p:last-of-type{
  margin-top:1.3rem !important;padding-top:1rem;border-top:1px solid #eef2f7;
  font-size:13px;color:#52647a;font-style:italic}