:root {
  --color-bg: #f5f6f4;
  --color-panel: #ffffff;
  --color-border: #d9dcd6;
  --color-text: #2b2f2b;
  --color-muted: #6b7268;
  --color-primary: #2a6f6f;
  --color-primary-dark: #1f5555;
  --color-secondary: #8a6d3b;
  --color-accent: #c0392b;
  --font-family: "Hiragino Sans", "Yu Gothic", "Noto Sans JP", "Meiryo", sans-serif;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-family);
  line-height: 1.5;
}

.app-header {
  padding: 1rem 1.5rem 0.75rem;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-panel);
}

.app-header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.4rem;
}

.subtitle {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.9rem;
}

.app-main {
  display: flex;
  flex-direction: row;
  gap: 1rem;
  padding: 1rem;
  align-items: flex-start;
}

.panel {
  flex: 0 0 340px;
  max-width: 340px;
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.panel-group h2 {
  font-size: 1rem;
  margin: 0 0 0.6rem;
  color: var(--color-primary-dark);
  border-left: 4px solid var(--color-primary);
  padding-left: 0.5rem;
}

.panel-group h3 {
  font-size: 0.9rem;
  margin: 0.8rem 0 0.4rem;
  color: var(--color-muted);
}

.control-row {
  margin-bottom: 0.75rem;
}

.control-row label {
  display: block;
  font-size: 0.85rem;
  margin-bottom: 0.3rem;
}

.control-row input[type="range"] {
  width: 100%;
}

.control-row-inline label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.range-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--color-muted);
  margin-top: 0.15rem;
}

.control-row select {
  width: 100%;
  padding: 0.4rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
}

.button-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.btn {
  flex: 1 1 auto;
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: #fff;
  color: var(--color-text);
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.15s ease, opacity 0.15s ease;
}

.btn:hover:not(:disabled) {
  background: #eef1ef;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--color-primary);
  border-color: var(--color-primary-dark);
  color: #fff;
  font-weight: bold;
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-dark);
}

.btn-secondary {
  background: var(--color-secondary);
  border-color: #6f5730;
  color: #fff;
}

.btn-secondary:hover:not(:disabled) {
  background: #6f5730;
}

.info-list {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.35rem;
}

.info-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
  font-size: 0.85rem;
  border-bottom: 1px dashed var(--color-border);
  padding-bottom: 0.2rem;
}

.info-item dt {
  color: var(--color-muted);
}

.info-item dd {
  margin: 0;
  font-weight: bold;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.unit-note {
  margin: 0.6rem 0 0;
  color: var(--color-muted);
  font-size: 0.75rem;
  font-style: italic;
}

.predict-question {
  font-size: 0.85rem;
  margin: 0 0 0.6rem;
}

.predict-result {
  margin-top: 0.6rem;
  font-size: 0.82rem;
}

.predict-result p {
  margin: 0 0 0.5rem;
}

.predict-baseline-note {
  color: var(--color-muted);
  font-size: 0.78rem;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}

.compare-table th, .compare-table td {
  border: 1px solid var(--color-border);
  padding: 0.35rem 0.4rem;
  text-align: center;
}

.compare-table th {
  background: #eef3f2;
  font-weight: normal;
  color: var(--color-muted);
}

.canvas-area {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.canvas-main-wrap {
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 0.5rem;
  height: 480px;
  display: flex;
}

.canvas-histogram-wrap {
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 0.5rem 0.75rem 0.75rem;
  height: 200px;
  display: flex;
  flex-direction: column;
}

.canvas-histogram-wrap h3 {
  margin: 0 0 0.4rem;
  font-size: 0.85rem;
  color: var(--color-muted);
  flex: 0 0 auto;
}

#main-canvas {
  width: 100%;
  height: 100%;
  display: block;
  border-radius: 6px;
}

#histogram-canvas {
  width: 100%;
  flex: 1 1 auto;
  display: block;
  min-height: 0;
}

.hidden {
  display: none !important;
}

.app-footer {
  text-align: center;
  color: var(--color-muted);
  font-size: 0.8rem;
  padding: 0.75rem;
}

@media (max-width: 860px) {
  .app-main {
    flex-direction: column;
  }

  .panel {
    flex: 1 1 auto;
    max-width: none;
    width: 100%;
  }

  .canvas-area {
    width: 100%;
  }

  .canvas-main-wrap {
    height: 380px;
  }
}