:root {
  --bg: #f7f7f5;
  --panel: #ffffff;
  --text: #1d1d1b;
  --muted: #6b6b66;
  --border: #deddd8;
  --accent: #1f5fbf;
  --accent-text: #ffffff;
  --error: #b42318;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161615;
    --panel: #1f1f1d;
    --text: #ecebe6;
    --muted: #a3a29c;
    --border: #3a3a36;
    --accent: #6b9cf0;
    --accent-text: #0e1a2e;
    --error: #f97066;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}
header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}
h1 { font-size: 18px; margin: 0; }
.sub, #user, #count { color: var(--muted); font-size: 13px; }
.spacer { flex: 1; }
main { max-width: 1200px; margin: 0 auto; padding: 24px 16px; }
textarea {
  width: 100%;
  padding: 12px;
  font: inherit;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  resize: vertical;
}
.row { display: flex; align-items: center; gap: 12px; margin-top: 8px; }
button, a.button {
  font: inherit;
  padding: 8px 18px;
  border-radius: 8px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--accent-text);
  cursor: pointer;
  text-decoration: none;
}
button:disabled { opacity: .5; cursor: default; }
button.link { background: none; border: none; color: var(--accent); padding: 0; }
.followup { color: var(--muted); font-size: 13px; }
#examples { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 16px 0; font-size: 13px; color: var(--muted); }
.chip {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 13px;
}
#status { margin: 16px 0; color: var(--muted); }
#status.error { color: var(--error); }
#answer { margin-top: 16px; }
#explanation { font-size: 16px; margin: 0 0 4px; }
#assumptions { color: var(--muted); font-size: 13px; margin: 0 0 8px; padding-left: 18px; }
.table-wrap {
  overflow: auto;
  max-height: 65vh;
  margin-top: 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
}
table { border-collapse: collapse; width: 100%; font-size: 13px; }
th, td { padding: 6px 10px; border-bottom: 1px solid var(--border); text-align: left; white-space: nowrap; }
th { position: sticky; top: 0; background: var(--panel); font-weight: 600; }
details { margin-top: 12px; }
pre {
  white-space: pre-wrap;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  font-size: 12px;
}
form.inline { display: inline; }
form.login { display: grid; gap: 12px; max-width: 320px; margin: 48px auto; }
form.login label { display: grid; gap: 4px; font-size: 13px; color: var(--muted); }
form.login input {
  font: inherit;
  padding: 8px 10px;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
}
.error { color: var(--error); margin: 0; }