:root {
  --bg: #f4f7f9;
  --panel-bg: #ffffff;
  --text: #1c2733;
  --muted: #5b6b79;
  --accent: #2e86ab;
  --border: #d8e0e6;
  --warn-bg: #fff4e5;
  --warn-border: #f0c674;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  padding: 0 16px 40px;
}

header {
  max-width: 900px;
  margin: 0 auto;
  padding-top: 32px;
}

h1 {
  margin-bottom: 4px;
}

.subtitle {
  color: var(--muted);
  margin-top: 0;
}

.disclaimer {
  max-width: 900px;
  margin: 16px auto;
  padding: 12px 16px;
  background: var(--warn-bg);
  border: 1px solid var(--warn-border);
  border-radius: 8px;
  font-size: 0.9rem;
  line-height: 1.4;
}

main {
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(260px, 320px) 1fr;
  gap: 20px;
}

@media (max-width: 700px) {
  main {
    grid-template-columns: 1fr;
  }
}

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
}

.field {
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field label {
  font-weight: 600;
  font-size: 0.9rem;
}

.field input[type="number"] {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 1rem;
}

.checkboxes {
  border: none;
  padding: 0;
  margin: 0 0 16px;
}

.checkboxes legend {
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0;
  margin-bottom: 6px;
}

.checkboxes label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: normal;
  margin-bottom: 4px;
}

button[type="submit"] {
  background: var(--accent);
  color: white;
  border: none;
  padding: 10px 18px;
  border-radius: 6px;
  font-size: 1rem;
  cursor: pointer;
}

button[type="submit"]:hover {
  filter: brightness(1.05);
}

.error {
  color: #c0392b;
  font-size: 0.9rem;
  min-height: 1.2em;
}

.summary {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  font-size: 0.95rem;
  line-height: 1.5;
}

.summary p {
  margin: 4px 0;
}

.chart-panel .note {
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.4;
  margin-top: 16px;
}