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a:hover{text-decoration:underline}header h1{font-size:2.2rem;color:#1a1a1a;line-height:1.25;margin-bottom:16px}header p{font-size:18px;line-height:1.6;color:#444;margin-bottom:12px}.calculator-container{background-color:#fff;border:1px solid #e0e0e0;border-radius:8px;padding:32px;margin:32px 0;box-shadow:0 4px 12px #0000000d}.form-group{margin-bottom:20px}.form-group .label-row{display:flex;align-items:center;gap:8px;margin-bottom:8px}.form-group label{display:block;font-weight:600;margin-bottom:8px;color:#333}.form-group .label-row label{margin-bottom:0}.form-group input{width:100%;padding:14px;border:1px solid #ccc;border-radius:6px;font-size:16px;box-sizing:border-box;transition:border-color .2s}.form-group input:focus{outline:none;border-color:#06c;box-shadow:0 0 0 3px #0066cc26}.calc-btn{background-color:#06c;color:#fff;border:none;padding:16px 24px;font-size:18px;font-weight:600;border-radius:6px;cursor:pointer;width:100%;margin-top:10px;transition:background-color 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