.calc-layout{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(330px,.85fr);gap:28px;align-items:start}
.calc-form{display:grid;gap:20px}
.calc-card,.calc-result__sticky{border:1px solid rgba(255,255,255,.13);background:rgba(15,23,42,.72);backdrop-filter:blur(18px);border-radius:24px;padding:24px;box-shadow:0 24px 70px rgba(0,0,0,.35)}
.calc-card h3,.calc-result h3{margin-top:0;color:#fff}
.calc-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.calc-checks{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:18px}
.calc-checks label{display:flex;align-items:center;gap:10px;min-height:46px;padding:12px 14px;border-radius:14px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);color:#e5e7eb;cursor:pointer}
.calc-checks input{width:auto}.calc-result{min-width:0}.calc-result__sticky{position:sticky;top:90px}
.calc-visual{margin:20px 0;height:230px;border-radius:22px;background:radial-gradient(circle at 40% 20%,rgba(251,191,36,.18),transparent 30%),linear-gradient(135deg,rgba(255,255,255,.08),rgba(255,255,255,.02));border:1px solid rgba(255,255,255,.12);display:flex;align-items:center;justify-content:center;overflow:hidden}
.calc-model{width:78%;max-width:390px;height:160px;position:relative}
.calc-model--stairs::before{content:"";position:absolute;left:18%;bottom:24px;width:64%;height:100px;background:repeating-linear-gradient(to top right,transparent 0 17px,rgba(251,191,36,.85) 17px 21px,transparent 21px 32px);border-left:5px solid rgba(251,191,36,.75);border-bottom:5px solid rgba(251,191,36,.75);transform:skewX(-18deg)}
.calc-model--stairs::after{content:"";position:absolute;left:10%;bottom:120px;width:80%;height:5px;background:#e5e7eb;transform:rotate(-28deg);transform-origin:left center}
.calc-model--railing::before{content:"";position:absolute;left:8%;top:48px;width:84%;height:8px;border-radius:999px;background:linear-gradient(90deg,#fbbf24,#e5e7eb)}
.calc-model--railing::after{content:"";position:absolute;left:11%;top:55px;width:78%;height:90px;background:repeating-linear-gradient(90deg,rgba(226,232,240,.95) 0 8px,transparent 8px 44px);border-bottom:6px solid rgba(251,191,36,.65)}
.calc-model--truss::before{content:"";position:absolute;left:7%;top:62px;width:86%;height:72px;clip-path:polygon(0 100%,50% 0,100% 100%,92% 100%,50% 18%,8% 100%);background:linear-gradient(135deg,rgba(251,191,36,.95),rgba(180,83,9,.9))}
.calc-model--truss::after{content:"";position:absolute;left:9%;top:72px;width:82%;height:62px;background:repeating-linear-gradient(120deg,transparent 0 28px,rgba(226,232,240,.9) 28px 34px,transparent 34px 56px);opacity:.9}
.result-list{display:grid;gap:10px}.result-list div{display:flex;justify-content:space-between;gap:16px;padding:12px 0;border-bottom:1px solid rgba(255,255,255,.1)}
.result-list span{color:#cbd5e1}.result-list strong{color:#fbbf24;text-align:right}.result-warning{margin:18px 0;padding:14px;border-radius:14px;background:rgba(251,191,36,.1);border:1px solid rgba(251,191,36,.35);color:#fde68a;line-height:1.5}
@media(max-width:980px){.calc-layout{grid-template-columns:1fr}.calc-result__sticky{position:static}}
@media(max-width:680px){.calc-grid,.calc-checks{grid-template-columns:1fr}.calc-card,.calc-result__sticky{padding:18px}.calc-model{width:92%}}