/* Self-contained styles — plain CSS, no Tailwind / kit dependency. */

:root {
  --bg: #f4f4f5;
  --card: #ffffff;
  --fg: #18181b;
  --muted: #71717a;
  --accent: #0d9488;
  --border: #e4e4e7;
}

:root.dark {
  --bg: #09090b;
  --card: #18181b;
  --fg: #fafafa;
  --muted: #a1a1aa;
  --accent: #2dd4bf;
  --border: #27272a;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100vh; }

body {
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.5 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  display: flex;
  justify-content: center;
  padding: 3rem 1rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.75rem;
  width: 100%;
  max-width: 26rem;
  box-shadow: 0 1px 3px rgb(0 0 0 / 0.06);
}

h1 { font-size: 1.4rem; margin: 0 0 0.25rem; }
.muted { color: var(--muted); font-size: 0.9rem; margin: 0 0 1.5rem; }

label { display: block; font-size: 0.85rem; color: var(--muted); margin: 1rem 0 0.35rem; }

input[type="number"], input[type="text"] {
  width: 100%;
  padding: 0.6rem 0.75rem;
  font-size: 1rem;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.row { display: flex; gap: 0.75rem; }
.row > div { flex: 1; }

.presets { display: flex; gap: 0.5rem; margin-top: 0.5rem; flex-wrap: wrap; }
.presets button {
  flex: 1;
  padding: 0.5rem;
  font-size: 0.9rem;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  border-radius: 8px;
  cursor: pointer;
}
.presets button.active { border-color: var(--accent); color: var(--accent); font-weight: 600; }

.result {
  margin-top: 1.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}
.result .big { font-size: 2rem; font-weight: 700; color: var(--accent); }
.result .line { display: flex; justify-content: space-between; font-size: 0.95rem; }
.result .col { display: flex; flex-direction: column; gap: 0.4rem; flex: 1; }