/* Fixed black & white theme */
.pc-box{max-width:520px;margin:30px auto 24px;padding:20px;border:1px solid #000;border-radius:12px;background:#fff;color:#000;font-family:Inter,system-ui,Arial,sans-serif;box-shadow:0 2px 10px rgba(0,0,0,.05)}
.pc-box h4{text-align:center;margin:4px 0 16px;font-size:20px;font-weight:700;letter-spacing:.3px;border-bottom:2px solid #000;padding-bottom:8px}
.pc-field{margin-bottom:12px}
.pc-label{display:block;font-weight:600;margin-bottom:6px;line-height:1.35}
.pc-input,.pc-btn{width:100%;font-size:15px;line-height:1.35;padding:12px;border-radius:10px;box-sizing:border-box}
.pc-input{border:1px solid #000;background:#fff;color:#000}
.pc-btn{margin-top:6px;background:#000;color:#fff;border:1px solid #000;cursor:pointer;transition:transform .06s ease}
.pc-btn:active{transform:scale(.99)}
.pc-result{margin-top:14px;padding:12px;border:1px solid #000;border-radius:10px;background:#fff}
.pc-grid{display:grid;grid-template-columns:1fr;gap:22px}
@media(min-width:900px){.pc-grid{grid-template-columns:1fr 1fr}}
.pc-amort-wrap{margin-top:12px}.pc-amort-toggle{cursor:pointer;text-decoration:underline;font-size:13px}
.pc-amort table{width:100%;border-collapse:collapse;margin-top:8px;font-size:13px}
.pc-amort th,.pc-amort td{border:1px solid #000;padding:6px;text-align:right}
.pc-amort th:nth-child(1),.pc-amort td:nth-child(1){text-align:center}