:root{color-scheme:dark}body{margin:0;min-height:100vh;background:linear-gradient(135deg,#07111f,#0f1c31);color:#f5f7fb;font-family:Inter,sans-serif}button,input{font:inherit}*{box-sizing:border-box}#root{min-height:100vh}.calculator-shell{padding-bottom:4rem}.calculator-hero{padding:4rem 0 2rem;background:radial-gradient(circle at top left,rgba(76,201,240,.16),transparent 34%)}.back-link{display:inline-block;margin-bottom:1.2rem;color:#7dd3fc;font-weight:600}.calculator-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:1.5rem;margin-top:1rem}.calculator-card,.result-card{padding:1.7rem;border-radius:24px;background:#ffffff0f;border:1px solid rgba(255,255,255,.1);box-shadow:0 20px 40px #0000002e;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.calculator-card h2,.result-card h2{margin:1rem 0 .8rem;font-size:1.25rem}.option-list,.feature-list{display:grid;gap:.8rem}.option-card,.feature-item{border:1px solid rgba(255,255,255,.12);border-radius:16px;padding:1rem;background:#ffffff0a;color:inherit;text-align:left;transition:border-color .2s ease,transform .2s ease}.option-card{display:flex;flex-direction:column;gap:.3rem;cursor:pointer}.option-card.active,.feature-item.selected{border-color:#4cc9f0b3;transform:translateY(-2px)}.feature-item{display:flex;align-items:center;gap:.8rem}.feature-item input{accent-color:#4cc9f0;width:1rem;height:1rem}.feature-item span{display:flex;flex-direction:column}.feature-item small{color:#9fb0cb;margin-top:.2rem}.result-card{align-self:start;position:sticky;top:1rem}.stat-grid{display:grid;gap:.8rem;margin:1.2rem 0}.stat-grid>div{padding:.9rem 1rem;border-radius:14px;background:#ffffff0d}.stat-grid span{display:block;color:#9fb0cb;font-size:.9rem;margin-bottom:.25rem}.result-note{margin:1rem 0 1.3rem;padding:1rem;border-radius:16px;background:#4cc9f01a}.result-note ul{padding-left:1rem;color:#dce7f7}@media(max-width:900px){.calculator-grid{grid-template-columns:1fr}.result-card{position:static}}