body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f0f0f0;
}
header {
  background: #333;
  color: white;
  padding: 1em;
  text-align: center;
}
nav ul {
  display: flex;
  justify-content: center;
  list-style: none;
  padding: 0;
  background: #555;
}
nav ul li {
  margin: 0 1em;
}
nav ul li a {
  color: white;
  text-decoration: none;
  padding: 0.5em;
}
main {
  padding: 2em;
}
.row {
  display: flex;
  justify-content: space-between;
}
.col {
  width: 45%;
  background: white;
  padding: 1em;
  box-shadow: 0 0 5px rgba(0,0,0,0.1);
}
table {
  width: 100%;
  border-collapse: collapse;
  background: white;
}
th, td {
  border: 1px solid #ccc;
  padding: 0.5em;
  text-align: left;
}
.chat-container {
  max-width: 600px;
  margin: 2em auto;
  background: #f4f4f4;
  padding: 1em;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
.message {
  margin: 1em 0;
  display: flex;
}
.message.bot {
  justify-content: flex-start;
}
.message.user {
  justify-content: flex-end;
}
.bubble {
  max-width: 70%;
  padding: 0.8em;
  border-radius: 10px;
  font-size: 1em;
  line-height: 1.4;
}
.bot .bubble {
  background: #e0f7fa;
  border-top-left-radius: 0;
}
.user .bubble {
  background: #c8e6c9;
  border-top-right-radius: 0;
}
.options {
  max-width: 600px;
  margin: 1em auto;
  text-align: center;
}
.options button {
  margin: 0.5em;
  padding: 0.5em 1em;
  font-size: 1em;
  border: none;
  border-radius: 8px;
  background-color: #00796b;
  color: white;
  cursor: pointer;
}
.options button:hover {
  background-color: #004d40;
}
/* 選択肢をユーザー吹き出しの中に */
.bubble button {
  background-color: #00796b;
  color: white;
  border: none;
  padding: 0.3em 0.8em;
  margin: 0.2em;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.95em;
}
.bubble button:hover {
  background-color: #004d40;
}
/* ▼ canvasが後ろに回るように設定 */
canvas {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 0;
}

/* ▼ nav（パンくずリスト）を前面にして、クリックできるようにする */
nav, nav * {
  position: relative;
  z-index: 10;
  pointer-events: auto;
  background-color: rgba(85, 85, 85, 0.9); /* 背景調整（任意） */
  color: white;
  padding: 0.5em;
}
#main-nav {
  background: #444;
}

#main-nav ul {
  display: flex;
  justify-content: center;
  list-style: none;
  padding: 0;
  margin: 0;
  background: #555;
}

#main-nav ul li {
  margin: 0 2em;
}

#main-nav ul li a {
  color: white;
  text-decoration: none;
  padding: 1em;
  display: block;
}