:root{
  --bg: linear-gradient(to right, #007bff, #6610f2);
  --card: #ffffff;
  --text: #111;
  --muted: #555;
  --primary: #0d6efd;
  --primary-contrast: #fff;
  --border: #000;
  --glass: rgba(255,255,255,0.08);
}
:root.dark{
  --bg: linear-gradient(to right, #141e30, #243b55);
  --card: #1f2a3a;
  --text: #f1f5f9;
  --muted: #cbd5e1;
  --primary: #60a5fa;
  --primary-contrast: #0b1220;
  --border: #fff;
  --glass: rgba(255,255,255,0.06);
}


html, body {
  margin:0; padding:0;
  font-family: Arial, sans-serif;
  min-height:100%;
}
body{
  color: #fff;
  background: var(--bg);
  background-attachment: fixed;
}


.topbar{
  display:flex; justify-content:space-between; align-items:center;
  padding: 12px 16px; color:#fff;
}
.brand{display:flex; align-items:center; gap:10px;}
.brand .logo{font-size:28px}
.brand h1{font-size:20px; margin:0}
.badge{
  background: rgba(0,0,0,0.25);
  border:2px solid #000; padding:4px 8px; border-radius:8px; font-weight:bold; color:#fff;
}


.controls{display:flex; align-items:center; gap:12px;}
.chip{
  border:2px solid var(--border);
  background: var(--glass);
  color:#fff; padding:6px 10px; border-radius:999px; cursor:pointer;
}
.chip:active{transform:scale(.98)}
.switch{position:relative; display:inline-block; width:48px; height:28px}
.switch input{display:none}
.slider{
  position:absolute; inset:0; background:#999; border-radius:999px; cursor:pointer;
}
.slider:before{
  content:""; position:absolute; height:22px; width:22px; left:3px; top:3px; background:#fff; border-radius:50%; transition:.2s;
}
.switch input:checked + .slider{background:#333}
.switch input:checked + .slider:before{transform:translateX(20px)}


.translate-widget{max-width:980px; margin:0 auto 8px; text-align:right; opacity:.6}


.container{
  max-width: 980px; margin: 12px auto 40px; padding: 0 12px;
}
.card{
  background: var(--card);
  color: var(--text);
  border: 4px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0,0,0,.15);
  padding: 18px;
  margin: 16px 0;
  animation: fadeIn .6s ease;
}


label{font-weight:bold; display:block; margin:8px 0 6px}
.input-field, select, input[type="date"]{
  width:100%; padding:10px; font-size:16px; border-radius:8px;
  border:3px solid var(--border); box-sizing:border-box; background:#fff; color:#000;
}
.actions{display:flex; gap:10px; flex-wrap:wrap; margin-top:10px}
button{
  border-radius:8px; padding:10px 14px; font-size:15px; font-weight:bold; cursor:pointer; border:3px solid var(--border);
  transition: transform .05s ease, filter .15s ease; user-select:none;
}
button:active{ transform: scale(.98) }
.primary{ background: var(--primary); color: var(--primary-contrast) }
.secondary{ background:#2b2727; color:#fff }
.ghost{ background:transparent; color:var(--text); border-style:dashed }


.result-box{
  font-size:20px; font-weight:bold; color: var(--text); display:inline-block; padding:8px; margin:0;
  border:4px solid var(--border); border-radius:8px; background: rgba(0,0,0,0.06);
}
#result{
  font-weight:bold; font-size:26px; color: var(--text);
  border:4px solid var(--border); padding:4px 10px; border-radius:8px; margin-left:10px; background: rgba(0,0,0,0.06);
}
.converted{margin-top:8px; font-size:14px; color:var(--muted)}
.result-line{display:flex; flex-direction:column; gap:6px}


.row{display:grid; grid-template-columns: 1fr; gap:12px}
.scheme{display:flex; flex-direction:column; gap:6px}
.weights{display:flex; flex-direction:column; gap:6px}
.hidden{display:none}
#weight-note{color:var(--muted)}


.tips{margin-top:10px; background: rgba(0,0,0,0.06); border-left:6px solid var(--primary); padding:10px; border-radius:8px}


canvas{background:#fff; border-radius:8px; border:2px solid var(--border)}


.horizontal-buttons{
  display:grid; grid-template-columns: repeat(4, 1fr); gap:10px; margin-top:10px;
}
.horizontal-buttons button{
  height:60px; font-size:18px; border-radius:8px; border:2px solid var(--border); background:#2b2727; color:#fff;
}
.horizontal-buttons button.equal{ background:#4caf50 }
.horizontal-buttons button.zero{ grid-column: span 2 }
#resultCalc{
  width:100%; height:60px; font-size:24px; text-align:right; margin-bottom:10px; border-radius:8px; padding-right:10px;
  border:3px solid var(--border); background:#fff; color:#000;
}


.footer{color:#fff; text-align:center; padding:18px 0}


@keyframes fadeIn{
  from{opacity:0; transform:translateY(-6px)}
  to{opacity:1; transform:translateY(0)}
}


@media (max-width: 720px){
  .row{grid-template-columns: 1fr}
}