:root{
  --bg: #f4f5f7;
  --panel: #ffffff;
  --text: #111827;
  --muted: #4b5563;
  --border: rgba(17, 24, 39, .12);
  --shadow: 0 10px 30px rgba(0,0,0,.06);
  --primary: #2563eb;
  --primary-2: #1d4ed8;
  --focus: rgba(37, 99, 235, .35);
  --mono-bg: rgba(0,0,0,.035);
}

:root[data-theme="dark"]{
  --bg: #0b1220;
  --panel: #0f1b2e;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --border: rgba(229, 231, 235, .14);
  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --primary: #60a5fa;
  --primary-2: #3b82f6;
  --focus: rgba(96, 165, 250, .3);
  --mono-bg: rgba(255,255,255,.06);
}

*{ box-sizing: border-box; }
html, body{ height: 100%; }
body{
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Liberation Sans", sans-serif;
  background: var(--bg);
  color: var(--text);
}

.mono{
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  background: var(--mono-bg);
  border: 1px solid var(--border);
  padding: .25rem .5rem;
  border-radius: 10px;
  display: inline-block;
}

.topbar{
  max-width: 1100px;
  margin: 1.25rem auto 0;
  padding: 0 1rem;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.logo{
  width: 70px;
  height: auto;
  border-radius: 90px;
  display: grid;
  place-items: center;
  display: block;
}

.topbar h1{
  font-size: 1.15rem;
  margin: 0;
  line-height: 1.2;
}
.subtitle{
  margin: .25rem 0 0;
  color: var(--muted);
  font-size: .92rem;
}

.theme-controls{
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

.theme-label{
  display: grid;
  gap: .35rem;
  font-size: .92rem;
}

select, input[type="number"]{
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  padding: .55rem .65rem;
  border-radius: 12px;
  outline: none;
}

select:focus, input[type="number"]:focus,
button:focus, input[type="range"]:focus{
  box-shadow: 0 0 0 4px var(--focus);
}

.container{
  max-width: 1100px;
  margin: 1rem auto 2rem;
  padding: 0 1rem;
  display: grid;
  gap: 1rem;
}

.card{
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 1rem;
}

.card h2{
  margin: 0 0 .75rem;
  font-size: 1rem;
}

.grid{
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 1rem;
}

@media (max-width: 820px){
  .grid{ grid-template-columns: 1fr; }
  .topbar{ flex-direction: column; }
}

.field{
  display: grid;
  gap: .45rem;
}

label{
  font-size: .92rem;
  color: var(--muted);
}

input[type="range"]{
  width: 100%;
  accent-color: var(--primary);
}

.range-meta{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  color: var(--muted);
  font-size: .9rem;
}

.hint{ color: var(--muted); }

.controls{
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  align-items: center;
}

.btn{
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: .6rem .8rem;
  cursor: pointer;
  transition: transform .02s ease;
}

.btn:active{ transform: translateY(1px); }

.btn.primary{
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}
.btn.primary:hover{ background: var(--primary-2); }

.btn:disabled{
  opacity: .55;
  cursor: not-allowed;
}

.divider{
  width: 1px;
  height: 28px;
  background: var(--border);
  margin: 0 .2rem;
}

.results .result-row{
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: .75rem;
  margin: .65rem 0;
  align-items: center;
}

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

.result-row .label{
  color: var(--muted);
  font-size: .92rem;
}

.value{
  word-break: break-word;
}

.actions{
  display: flex;
  align-items: center;
  gap: .75rem;
  margin-top: .75rem;
  flex-wrap: wrap;
}

.status{
  color: var(--muted);
  min-height: 1.25rem;
}

.help p{
  margin: .5rem 0;
  color: var(--text);
}

.muted{
  color: var(--muted);
}

.footer{
  max-width: 1100px;
  margin: 0 auto 1.75rem;
  padding: 0 1rem;
  display: flex;
  justify-content: flex-end;
}