.online-rechner-container{max-width:1400px;margin:0 auto;padding:0 30px;display:flex;gap:30px;align-items:flex-start}.rechner-sidebar{width:380px;flex-shrink:0;position:sticky;top:20px}.rechner-sidebar h2{font-size:1.8rem;font-weight:700;color:#2c2c2c;margin:0 0 25px;padding:25px 30px;background:linear-gradient(135deg,#fffffff2,#f0f0f5f2);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-radius:16px;border:2px solid rgba(255,255,255,.6);box-shadow:0 8px 32px #0000001a,inset 0 1px #fffc}.rechner-accordion{background:linear-gradient(135deg,#ffffffeb,#f5f7faeb);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-radius:16px;border:2px solid rgba(255,255,255,.6);box-shadow:0 8px 32px #0000001a,inset 0 1px #fffc;overflow:hidden}.accordion-item{border-bottom:1px solid rgba(200,200,210,.3)}.accordion-item:last-child{border-bottom:none}.accordion-header{background:linear-gradient(135deg,#ffffffb3,#f0f2f5b3);padding:18px 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