:root{
  --rk-red:#a40000;
  --rk-dark:#222;
  --rk-grey:#666;
  --rk-light:#f4f4f4;
  --rk-white:#fff;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:transparent}
body{
  font-family:Arial,Helvetica,sans-serif;
  color:var(--rk-dark);
  line-height:1.35;
}
.box{
  width:min(100%,760px);
  margin:0 auto;
  padding:18px 20px 20px;
  background:var(--rk-white);
  border-top:5px solid var(--rk-red);
}
h1{
  margin:0 0 2px;
  color:var(--rk-red);
  font-size:clamp(25px,5vw,36px);
  line-height:1.05;
  text-align:center;
}
h2{
  margin:0 0 12px;
  font-size:clamp(18px,3.5vw,24px);
  text-align:center;
}
h3{margin:14px 0 6px;font-size:15px}
p{margin:7px 0;font-size:14px}
input{
  display:block;width:100%;
  margin:12px 0 8px;padding:12px 14px;
  border:2px solid #bbb;border-radius:4px;
  font-size:17px;background:#fff;
}
input:focus{outline:3px solid rgba(164,0,0,.16);border-color:var(--rk-red)}
button{
  width:100%;min-height:48px;
  padding:10px 14px;margin:6px 0;
  border:0;border-radius:4px;
  background:var(--rk-red);color:#fff;
  font-size:17px;font-weight:700;cursor:pointer;
}
button:hover{filter:brightness(.92)}
button:disabled{background:#aaa;cursor:not-allowed;filter:none}
#stop{background:#333}
#send{background:var(--rk-red)}
#timer{
  margin:6px 0 2px;text-align:center;
  font-size:34px;font-weight:700;font-variant-numeric:tabular-nums;
}
audio{display:block;width:100%;margin:8px 0}
.hint{font-size:12px;color:#555}
hr{border:0;border-top:1px solid #ddd;margin:13px 0}
#status{min-height:20px;text-align:center;font-size:13px;font-weight:700}
.meter,.level,.level-wrap,#meter{
  width:100%;height:9px;margin:4px 0 8px;
  border-radius:20px;background:#e5e5e5;overflow:hidden;
}
.meter > *, .level > *, #meter > *{height:100%;background:var(--rk-red)}
body.embed .box{max-width:none;border-top-width:4px;padding:12px 14px 14px}
body.embed h1{font-size:27px}
body.embed h2{font-size:19px;margin-bottom:8px}
body.embed p{font-size:13px;margin:5px 0}
body.embed button{min-height:44px;font-size:16px}
@media(max-width:520px){
 .box{padding:12px}
 h1{font-size:27px} h2{font-size:19px}
 p{font-size:13px}
 button{min-height:46px;font-size:16px}
 #timer{font-size:30px}
}

.home-button{
  display:block;
  width:100%;
  margin:12px 0 0;
  padding:10px 14px;
  border:2px solid var(--rk-red,#a40000);
  border-radius:4px;
  background:#fff;
  color:var(--rk-red,#a40000);
  font-size:15px;
  font-weight:700;
  text-align:center;
  text-decoration:none;
}
.home-button:hover{
  background:var(--rk-red,#a40000);
  color:#fff;
}