:root {
  color-scheme: light dark;
  --bg: #f7f7f8; --panel: #ffffff; --fg: #1c1e21; --muted: #5b6270;
  --line: #d8dbe0; --grid: #e6e8ec; --accent: #2a7ae2;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #16181c; --panel: #1e2126; --fg: #e7e9ec; --muted: #9aa2ae;
    --line: #33373d; --grid: #2a2e34; --accent: #6fa8ff;
  }
}

:root[data-theme="dark"] {
  --bg: #16181c; --panel: #1e2126; --fg: #e7e9ec; --muted: #9aa2ae;
  --line: #33373d; --grid: #2a2e34; --accent: #6fa8ff;
}

* { box-sizing: border-box; }
body {
  margin: 0; padding: 16px; background: var(--bg); color: var(--fg);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}
header h1 { margin: 0 0 4px; font-size: 1.4rem; }
header p { margin: 0; color: var(--muted); }
.controls { display: flex; flex-wrap: wrap; gap: 8px; align-items: end; margin: 16px 0; }
.controls label {
  display: flex; flex: 1 1 160px; flex-direction: column; gap: 4px;
  font-size: 0.8rem; color: var(--muted);
}
input, select, button {
  padding: 6px 8px; font: inherit; color: var(--fg); background: var(--panel);
  border: 1px solid var(--line); border-radius: 6px;
}
#curve-dates { width: 100%; }
#status { color: var(--muted); font-size: 0.85rem; }
main { display: grid; gap: 16px; }
section { padding: 12px; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; }
h2 { margin: 0 0 8px; font-size: 1rem; }
canvas { display: block; width: 100%; height: 240px; }
.note, #table-note { margin: 8px 0 0; color: var(--muted); font-size: 0.8rem; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
th, td { padding: 4px 8px; text-align: left; white-space: nowrap; border-bottom: 1px solid var(--grid); }
th { color: var(--muted); font-weight: 600; }
footer {
  margin-top: 20px; padding-top: 12px; color: var(--muted);
  font-size: 0.8rem; border-top: 1px solid var(--line);
}
a { color: var(--accent); }
@media (max-width: 480px) { body { padding: 10px; } canvas { height: 200px; } }