* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Helvetica Neue", Arial, sans-serif;
}

body {
  background: #f8f8f8;
  color: #333;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 40px;
  background: #111;
  color: #fff;
}

.header a {
  color: #fff;
  margin-left: 20px;
  text-decoration: none;
}

.logo {
  font-size: 20px;
  font-weight: bold;
}

.hero, .page-hero {
  padding: 100px 20px;
  text-align: center;
  background: #222;
  color: #fff;
}

.hero h1 {
  font-size: 36px;
}

.btn-large {
  display: inline-block;
  margin-top: 20px;
  padding: 14px 32px;
  background: #000;
  color: #fff;
  text-decoration: none;
}

.service {
  display: flex;
  gap: 20px;
  padding: 60px 40px;
}

.service-card {
  background: #fff;
  padding: 30px;
  flex: 1;
}

.content {
  padding: 60px 40px;
}

footer {
  text-align: center;
  padding: 20px;
  background: #111;
  color: #fff;
}

/* チャット */
#chat-button {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: #000;
  color: #fff;
  padding: 14px;
  border-radius: 50px;
  cursor: pointer;
}

#chat-box {
  position: fixed;
  bottom: 80px;
  right: 20px;
  width: 300px;
  background: #fff;
  display: none;
  flex-direction: column;
  border: 1px solid #ccc;
}

#chat-header {
  background: #000;
  color: #fff;
  padding: 10px;
}

#chat-messages {
  padding: 10px;
  height: 200px;
  overflow-y: auto;
}

#chat-input {
  display: flex;
}

#chat-input input {
  flex: 1;
  padding: 8px;
}

#chat-input button {
  padding: 8px;
  background: #000;
  color: #fff;
  border: none;
}