:root {
  --bg: #f5f5f7;
  --card: #fff;
  --text: #1d1d1f;
  --muted: #86868b;
  --accent: #0071e3;
  --border: #d2d2d7;
  --radius: 12px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  padding: 16px;
}

.container { max-width: 960px; margin: 0 auto; }

h1 { font-size: 1.4rem; font-weight: 600; margin-bottom: 20px; }

.input-section {
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.input-section label {
  font-size: .75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .04em;
}

.input-section input,
.input-section select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  background: var(--bg);
  color: var(--text);
  outline: none;
}

.input-section input:focus,
.input-section select:focus { border-color: var(--accent); }

.settings-section {
  background: var(--card);
  border-radius: var(--radius);
  margin-bottom: 12px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.settings-section summary {
  padding: 12px 16px;
  cursor: pointer;
  font-size: .85rem;
  font-weight: 500;
  color: var(--muted);
  user-select: none;
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
  padding: 0 16px 16px;
}

.settings-grid label {
  font-size: .75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .04em;
}

.settings-grid input,
.settings-grid select {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: .9rem;
  background: var(--bg);
  color: var(--text);
  outline: none;
}

.settings-grid input:focus,
.settings-grid select:focus { border-color: var(--accent); }

.settings-grid input[readonly] { background: var(--bg); color: var(--muted); }

.preset-row { grid-column: 1 / -1; }

.table-section {
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.copy-btn {
  float: right;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-size: .8rem;
  cursor: pointer;
}

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

.copy-btn.copied {
  background: #34c759;
  color: #fff;
  border-color: #34c759;
}

.table-wrapper { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: .85rem;
}

th, td {
  padding: 8px 12px;
  text-align: right;
  white-space: nowrap;
}

th {
  font-weight: 600;
  color: var(--muted);
  border-bottom: 2px solid var(--border);
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .04em;
}

td { border-bottom: 1px solid var(--border); }

tr:last-child td { border-bottom: none; }

td:first-child { text-align: left; font-weight: 500; }

td.active-unit { font-weight: 700; color: var(--accent); }

@media (max-width: 600px) {
  .input-section { grid-template-columns: 1fr; }
  body { padding: 10px; }
}