:root {
  --bg: #0f1419;
  --card: #1a2332;
  --text: #e7ecf3;
  --muted: #9aa7b8;
  --accent: #3b82f6;
  --line: #2a3648;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}
.top { padding: 1.25rem 1.5rem 0.5rem; }
.top h1 { margin: 0 0 0.25rem; font-size: 1.35rem; }
.top p { margin: 0; color: var(--muted); font-size: 0.9rem; }
.tabs { display: flex; gap: 0.5rem; padding: 1rem 1.5rem; }
.tab {
  background: var(--card);
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.45rem 1rem;
  cursor: pointer;
}
.tab.active { color: #fff; background: var(--accent); border-color: var(--accent); }
main { padding: 0 1.5rem 2rem; }
.panel { display: none; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 1rem 1.25rem; }
.panel.active { display: block; }
.panel h2 { margin: 0 0 1rem; font-size: 1.05rem; }
.row { display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: end; margin-bottom: 0.75rem; }
label { display: flex; flex-direction: column; gap: 0.25rem; font-size: 0.8rem; color: var(--muted); }
input, select {
  background: #0d1218;
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 8px;
  padding: 0.45rem 0.6rem;
  min-width: 9rem;
}
button {
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: 8px;
  padding: 0.55rem 0.9rem;
  cursor: pointer;
  height: 2.15rem;
}
.out {
  background: #0d1218;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.75rem;
  min-height: 12rem;
  max-height: 28rem;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 0.8rem;
}
#chart {
  width: 100%;
  background: #0d1218;
  border: 1px solid var(--line);
  border-radius: 8px;
  margin-bottom: 0.75rem;
}