.calc-section{padding:80px 0;background:radial-gradient(circle at 85% 15%,#4a0712 0,transparent 28%),#0d1113;border-top:1px solid #252e31}
.calc-shell{max-width:820px;margin:auto;background:linear-gradient(145deg,#171d20,#0d1113);border:1px solid #343f43;border-radius:18px;padding:34px;box-shadow:0 28px 70px #0008}
.calc-header{text-align:center;margin-bottom:28px}.calc-header h2{font-size:clamp(2rem,5vw,3.2rem);line-height:1.03;letter-spacing:-.04em;margin:10px 0 12px}.calc-header p{color:#bac3c6;max-width:650px;margin:auto}
.calc-progress-head{display:flex;justify-content:space-between;gap:20px;font-size:.82rem;font-weight:800;color:#cbd2d4;margin-bottom:8px}.calc-progress{height:8px;background:#252d30;border-radius:99px;overflow:hidden}.calc-progress span{display:block;height:100%;background:linear-gradient(90deg,#c9001b,#ff2440);border-radius:inherit;transition:width .25s ease}
.calc-panel{padding:34px 0 4px}.calc-panel h3{font-size:clamp(1.35rem,3vw,1.85rem);line-height:1.2;margin:0 0 22px}.calc-options{display:grid;gap:11px}.calc-option{width:100%;min-height:58px;text-align:left;padding:14px 17px;border:1px solid #3c474b;border-radius:10px;background:#0b0f11;color:#fff;font-weight:750;cursor:pointer;transition:.18s}.calc-option:hover,.calc-option:focus-visible{border-color:#ee1834;transform:translateY(-1px);outline:none}.calc-option.selected{border-color:#ff2742;background:#381019;box-shadow:inset 4px 0 #ed102b}
.calc-counter{display:flex;align-items:center;justify-content:center;gap:28px;min-height:145px;background:#0a0e10;border:1px solid #343e42;border-radius:12px}.calc-counter button{width:58px;height:58px;border:1px solid #505c60;border-radius:50%;background:#171d20;color:#fff;font-size:2rem;cursor:pointer}.calc-counter output{min-width:75px;text-align:center;font-size:3.4rem;font-weight:900;color:#ff233e}.calc-example{color:#98a3a6;font-size:.85rem;text-align:center;margin:12px 0 0}
.calc-nav{display:flex;justify-content:space-between;gap:12px;margin-top:28px}.calc-nav .button[disabled]{opacity:.4;cursor:not-allowed}.calc-result{padding:30px;border:1px solid #ff2843;background:linear-gradient(145deg,#3a0c15,#171215);border-radius:14px;text-align:center}.calc-result-label{color:#ff99a7;text-transform:uppercase;letter-spacing:1.4px;font-size:.8rem;font-weight:900}.calc-result h3{font-size:clamp(2rem,5vw,3.2rem);line-height:1.05;margin:10px 0 16px}.calc-result p{color:#d8dddf;max-width:650px;margin:0 auto 24px}.calc-result .actions{justify-content:center}.calc-summary{margin:22px 0 0;padding:16px;background:#0b0f1199;border-radius:9px;text-align:left;color:#cdd4d6;font-size:.86rem}
@media(max-width:600px){.calc-section{padding:55px 0}.calc-shell{padding:22px 18px;border-radius:13px}.calc-panel{padding-top:27px}.calc-option{min-height:62px}.calc-counter{gap:20px}.calc-result{padding:24px 17px}.calc-result .actions{display:grid}.calc-result .button{width:100%}}