body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 10px;
  line-height: 1.6;
  background-color: #f8f9fa;
  color: #333;
}

header, main {
  max-width: 800px;
  margin: 0 auto;
}

h1 {
  font-size: 1.8em;
  margin-top: 1em;
  margin-bottom: 0.5em;
  text-align: center;
  color: #2c3e50;
}

h2 {
  font-size: 1.2em;
  margin-top: 2em;
  margin-bottom: 0.3em;
  text-align: left;
  color: #34495e;
}

section {
  margin-bottom: 2em;
}

.radio-group label {
  display: block;
  margin: 0.3em 0;
  font-size: 1.1em;
}

.form-group {
  margin-bottom: 1em;
}

label {
  display: block;
  margin-bottom: 0.2em;
}

input[type="text"] {
  width: 100%;
  max-width: 300px;
  padding: 8px;
  font-size: 1em;
  box-sizing: border-box;
}

button {
  padding: 10px 16px;
  margin-right: 10px;
  background-color: #3498db;
  color: #fff;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 1em;
}

button:hover {
  background-color: #2980b9;
}

#chart-container {
  width: 100%;
  height: 400px;
  margin-bottom: 1.2em;
}

canvas {
  width: 100% !important;
  height: auto !important;
  max-width: 100%;
}

#result {
  margin-bottom: 1.2em;
}

#result h2,
#chart-title {
  margin-top: 1em;
  margin-bottom: 0.5em;
  text-align: left;
  font-size: 1.2em;
  color: #2d3436;
}

@media screen and (max-width: 600px) {
  body {
    padding: 0 6px;
  }

  h1 {
    font-size: 1.4em; /* 元は1.8em、少しだけ小さく */
    line-height: 1.2;
  }

  input[type="text"] {
    max-width: 100%;
  }

  button {
    width: 100%;
    margin-bottom: 8px;
  }
}

/* プライバシー注意書きのスタイル */
.privacy-note {
  font-size: 0.85rem;
  color: #555;
  background-color: #f8f8f8;
  border-left: 3px solid #ccc;
  padding: 10px 15px;
  margin: 15px 0;
  line-height: 1.7;
  text-indent: -1.0em;
  padding-left: 1.5em;
}

.privacy-note::before {
  content: "※";
  font-weight: bold;
}

/* グラフの代替情報のスタイル */
#data-table-container table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5em;
}

#data-table-container th,
#data-table-container td {
  border: 1px solid #ccc;
  padding: 8px;
  text-align: right;
}

#data-table-container th {
  background-color: #f0f0f0;
}

/* フォーム要素のフォーカススタイル */
input[type="text"]:focus,
button:focus {
  outline: 2px solid #2980b9;
  outline-offset: 2px;
  background-color: #eaf4fb;
}

.hidden-section {
  display: none;
}

.footer-note {
  font-size: 0.9em;
  text-align: center;
  color: #888;
}