:root{
  --bg: #f4f6f9;
  --card: #ffffff;
  --text: #0b1220;
  --muted: #55627a;
  --border: #d7dce5;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --danger: #b91c1c;
  --danger-bg: #fdecec;
  --success-bg: #e9f7ef;
  --shadow: rgba(0,0,0,0.10);
  --input-bg: #ffffff;
  --focus: rgba(37,99,235,0.35);
  --chip-bg: rgba(127,127,127,0.10);
}

[data-theme="dark"]{
  --bg: #0b1220;
  --card: #121a2b;
  --text: #e7ecf5;
  --muted: #a9b4c9;
  --border: #25304a;
  --primary: #60a5fa;
  --primary-hover: #3b82f6;
  --danger: #f87171;
  --danger-bg: rgba(248,113,113,0.12);
  --success-bg: #0f2a1c;
  --shadow: rgba(0,0,0,0.45);
  --input-bg: #0f172a;
  --focus: rgba(96,165,250,0.35);
  --chip-bg: rgba(255,255,255,0.08);
}

*{ box-sizing:border-box; }

body{
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  margin: 0;
  padding: 16px;
  background: var(--bg);
  color: var(--text);
}

.container{
  max-width: 760px;
  margin: 0 auto;
  padding: 16px;
}

.header{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap: 12px;
  margin-bottom: 14px;
  padding: 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 8px 22px var(--shadow);
}

h1{ margin:0; font-size: 22px; }
.sub{ margin:6px 0 0 0; color: var(--muted); font-size: 13px; line-height: 1.35; }

.card{
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  margin: 12px 0;
  box-shadow: 0 8px 22px var(--shadow);
}

h2{ margin: 0 0 12px 0; font-size: 16px; }

label{ display:block; font-weight: 700; font-size: 13px; margin-bottom: 6px; }

select, input, button{
  width: 100%;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  font-size: 16px;
  background: var(--input-bg);
  color: var(--text);
  outline: none;
}

select:focus, input:focus, button:focus{
  box-shadow: 0 0 0 4px var(--focus);
  border-color: var(--primary);
}

.grid3{ display:grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; }
.grid2{ display:grid; grid-template-columns: 1fr 1fr; gap: 10px; align-items: end; }

.btnRow{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 10px;
}

.actions{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 12px 0;
}

.btn{
  background: var(--primary);
  color: #fff;
  border: none;
  cursor:pointer;
  font-weight: 700;
  letter-spacing: .2px;
}

.btn:hover{ background: var(--primary-hover); }

.btn.secondary{
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}
.btn.secondary:hover{ background: rgba(127,127,127,0.12); }

.result{
  background: var(--success-bg);
  border: 1px solid rgba(0,0,0,0.05);
  border-radius: 12px;
  padding: 14px;
  font-weight: 700;
  text-align: left;
  display:none;
}

.extras{
  margin-top: 10px;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--card);
  display:none;
}

.error{
  display:none;
  margin: 10px 0;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(0,0,0,0.05);
  background: var(--danger-bg);
  color: var(--danger);
  font-weight: 700;
  font-size: 13px;
}

.note{
  margin: 10px 0 0 0;
  font-size: 12px;
  color: var(--muted);
}

.footer{
  margin-top: 14px;
  padding: 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--card);
  display:flex;
  gap: 10px;
  align-items:center;
  justify-content:center;
  color: var(--muted);
  font-size: 12px;
}

.footer a{ color: var(--muted); text-decoration: underline; }

.dot{ opacity: .65; }

.toggle{
  display:flex;
  align-items:center;
  gap: 8px;
  user-select:none;
  white-space:nowrap;
  font-size: 13px;
  color: var(--muted);
}

.switch{
  width: 44px;
  height: 26px;
  border-radius: 999px;
  background: rgba(127,127,127,0.25);
  position: relative;
  border: 1px solid var(--border);
  cursor:pointer;
  flex: 0 0 auto;
}

.switch::after{
  content:"";
  position:absolute;
  top: 3px;
  left: 3px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--card);
  border: 1px solid var(--border);
  transition: transform 160ms ease;
}

[data-theme="dark"] .switch::after{ transform: translateX(18px); }

.chips{ display:flex; flex-wrap:wrap; gap: 10px; margin-top: 10px; }
.chip{
  display:flex;
  align-items:center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--chip-bg);
}
.chip legend{ font-weight: 800; font-size: 12px; padding: 0 6px; }
.chip label{ margin: 0; font-weight: 700; font-size: 13px; display:flex; align-items:center; gap: 8px; }
.chip small{ color: var(--muted); font-weight: 700; }
.chip input[type="radio"], .chip input[type="checkbox"]{
  width: 18px; height: 18px; margin: 0; accent-color: var(--primary);
}

.hintBox{
  border: 1px dashed var(--border);
  border-radius: 12px;
  padding: 12px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.35;
}

@media (max-width: 640px){
  body{ padding: 12px; }
  .header{ flex-direction: column; }
  .grid3{ grid-template-columns: 1fr; }
  .grid2{ grid-template-columns: 1fr; }
  .btnRow{ grid-template-columns: 1fr; }
  .actions{ grid-template-columns: 1fr; }
}

.muted{ color: var(--muted); font-weight: 700; font-size: 12px; }
.extraGrid{
  display:grid;
  grid-template-columns: 1fr;
  gap: 10px;
}
@media (min-width: 640px){
  .extraGrid{ grid-template-columns: 1fr 1fr 1fr; }
}
.extraGrid .k{ color: var(--muted); font-weight: 800; font-size: 12px; margin-bottom: 4px; }
.extraGrid .v{ font-weight: 800; }