:root{
  --bg: #F5F6F8;
  --card: #FFFFFF;
  --purple: #7C4DFF;
  --border: #E6E6E6;
  --divider: #EFEFEF;
  --error: #E33A3A;
  --text: #1A1A1A;
  --muted: #666666;
  --max-width: 720px;
  --radius-small: 14px;
  --radius-big: 88px;
  --shadow: 0 8px 24px rgba(28,28,30,0.06);
}

*{
box-sizing:border-box;
margin:0;
padding: 0;
}
html,body{height:100%}
body{
  margin:0;
  font-family: "Poppins", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background:var(--bg);
  color:var(--text);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

.page{
  height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:48px 20px;
}

/* Card */
.age-card{
  position:relative;
  width:100%;
  display: flex;
  align-items: center;
  justify-content: center;
  max-width:var(--max-width);
  background:var(--card);
  padding:28px 56px 40px 36px;
  border-radius: var(--radius-small) var(--radius-small) var(--radius-big) var(--radius-small);
  box-shadow:var(--shadow);
  border:1px solid rgba(0,0,0,0.02)
}

/* Top row: inputs + button */
.top-row{
  display:flex;
  align-items:flex-start;
  gap:16px;
  position:relative;
}

/* Inputs grid */
.inputs-grid{
  display:grid;
  grid-template-columns: repeat(3,1fr);
  gap:18px;
  flex:1 1 auto;
}

/* Single input block */
.input-block{
  display:flex;
  flex-direction:column;
}

.label-small{
  font-size:11px;
  text-transform:uppercase;
  color:var(--muted);
  font-weight:600;
  letter-spacing:1px;
  margin-bottom:8px;
}

/* Number inputs */
input[type="number"]{
  -moz-appearance: textfield;
  appearance: none;
  padding:14px 12px;
  border-radius:10px;
  border:1px solid var(--border);
  background:#ffffff;
  box-shadow: inset 0 1px 2px rgba(16,16,16,0.03);
  font-weight:700;
  font-size:18px;
  color:var(--text);
  outline:none;
}

/* hide spin buttons in Chrome */
input[type=number]::-webkit-inner-spin-button, 
input[type=number]::-webkit-outer-spin-button { 
  -webkit-appearance: none; 
  margin: 0; 
}

/* invalid */
input.invalid{
  border-color: var(--error);
  box-shadow: 0 0 0 3px rgba(227,58,58,0.06);
}

/* error message */
.error{
  margin:8px 0 0;
  color:var(--error);
  font-size:12px;
  min-height:16px;
}

/* Divider */
.divider{
  border: none;
  height:1px;
  background:var(--divider);
  margin:20px 0 24px;
}

/* Results */
.results{
  display:flex;
  flex-direction: column;
  gap:28px;
  align-items:flex-start;
  flex-wrap:wrap;
}

.result-line{
  display:flex;
  align-items:baseline;
  gap:12px;
}

.result-number{
  color:var(--purple);
  font-weight:800;
  font-size:48px;
  line-height:1;
}

.result-label{
  font-size:34px;
  font-weight:800;
  color:var(--text);
  font-style:italic;
  line-height:1;
}
#ageForm{
    position: relative;
}
/* Calculate button */
.calc-btn{
  width:56px;
  height:56px;
  border-radius:50%;
  background:var(--purple);
  border: none;
  display:flex;
  align-items:center;
  justify-content:center;
  box-shadow: 0 6px 18px rgba(124,77,255,0.18);
  cursor:pointer;
  transition: transform .12s ease;
}

/* Position the button vertically centered between top of inputs and results */
.calc-btn{
  position:absolute;
  right:28px;
  top:34%;
  transform:translateY(-50%);
}

/* button active */
.calc-btn:active{ transform: translateY(-48%); }

/* Responsive */
@media (max-width:720px){
  .age-card{ padding:20px; }
  .inputs-grid{ gap:12px; grid-template-columns: repeat(3,1fr); }
  .result-number{ font-size:40px; }
  .result-label{ font-size:28px; }
}

@media (max-width:560px){
  .top-row{ flex-direction:column; align-items:stretch; gap:12px; }
  .inputs-grid{ grid-template-columns: 1fr; }
  .calc-btn{
    position:relative;
    right:auto;
    top:auto;
    transform:none;
    align-self:flex-end;
    margin-top:6px;
  }
  .results{
    gap:18px;
    justify-content:space-between;
  }
  .age-card{ padding:18px; border-radius:14px; }
}