body {
  margin: 0;
  font-family: "Hiragino Kaku Gothic ProN", sans-serif;
}

a {
  text-decoration: none;
}

ul {
  list-style-type: none;
  padding: 0;
}

li {
  display: inline-block;
}

ul li a,
.link-style {
  color: white;
  text-decoration: underline;
  font-size: 16pt;
}

.spacing {
  margin-top: 20px;
  display: block;
}

/* ヘッダー */
header {
  height: 65px;
  width: 100%;
  background-color: rgba(34, 49, 52, 0.9);
  position: fixed;
  top: 0;
  z-index: 10;
}

.header-left {
  float: left;
}

.header-right {
  float: right;
  background-color: rgba(255, 255, 255, 0.3);
  transition: all 0.5s;
}

.header-right:hover {
  background-color: rgba(255, 255, 255, 0.5);
}

.header-right a {
  line-height: 65px;
  padding: 0 25px;
  color: white;
  display: block;
}

.logo {
  width: 200px;
  margin-top: -25px;
}

/* トップセクション */
.top-wrapper {
  padding: 180px 0 100px;
  background-image: url(https://prog-8.com/images/html/advanced/top.png);
  background-size: cover;
  color: white;
  text-align: center;
}

.top-wrapper h1,
.top-wrapper h2,
.top-wrapper p {
  opacity: 0.7;
  letter-spacing: 5px;
}

.top-wrapper h1 {
  font-size: 45px;
}

.top-wrapper h2 {
  font-size: 25px;
}

.top-wrapper p {
  text-align: center;
}

/* ボタン */
.btn-wrapper {
  margin: 40px 0;
}

.btn-wrapper p {
  margin: 10px 0;
}

.btn {
  padding: 8px 24px;
  color: white;
  display: inline-block;
  opacity: 0.8;
  border-radius: 4px;
  transition: opacity 0.3s ease;
}

.btn:hover {
  opacity: 1;
}

.btn.signup {
  background-color: #239b76;
}

.btn.facebook {
  background-color: #3b5998;
  margin-right: 10px;
}

.btn.twitter {
  background-color: #55acee;
}

.fa {
  margin-right: 5px;
}

/* レッスンセクション */
.lesson-wrapper {
  height: 500px;
  padding-bottom: 80px;
  text-align: center;
}

.heading {
  padding: 40px 0 30px;
  color: #5f5d60;
}

.heading h2,
.heading h3 {
  font-weight: normal;
}

.lesson {
  float: left;
  width: 25%;
}

.lesson-icon {
  position: relative;
}

.lesson-icon p {
  position: absolute;
  top: 60px;
  width: 100%;
  color: white;
  font-size: 20pt;
  font-weight: bold;
}

.txt-contents {
  width: 80%;
  margin-top: 20px;
  font-size: 12px;
  color: #b3aeb5;
  display: inline-block;
}

/* メッセージボタン */
.message-wrapper {
  border-bottom: 1px solid #eee;
  padding-bottom: 100px;
  text-align: center;
}

.message {
  font-size: 24px;
  padding: 15px 40px;
  background-color: #5dca88;
  cursor: pointer;
  box-shadow: 0 7px #1a7940;
  transition: top 0.1s ease;
}

.message:active {
  position: relative;
  top: 7px;
  box-shadow: none;
}

/* フッター */
footer {
  padding-top: 30px;
  text-align: center;
}

footer img {
  width: 125px;
}

footer p {
  color: #b3aeb5;
  font-size: 12px;
}

/* アートギャラリー */
.art-container {
  display: flex;
  text-align: center;
  flex-wrap: wrap;
  justify-content: center;
  gap: 40px;
  margin: 40px auto;
  max-width: 1000px;
  padding: 0 20px;
}

.art-item {
  max-width: 400px;
  text-align: center;
}

.art-item img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
  border-radius: 10px;
}

.btn.purchase {
  display: inline-block;
  background-color: #4CAF50;
  color: white;
  padding: 12px 24px;
  font-size: 16px;
  border-radius: 8px;
  margin-top: 10px;
  transition: background-color 0.3s ease;
}

.btn.purchase:hover {
  background-color: #45a049;
}

/* 無料レポートセクション */
.report-section {
  background-color: #f9f9f9;
  padding: 40px 20px;
  text-align: center;
  margin-top: 60px;
  border-radius: 12px;
}

.report-title {
  font-size: 2rem;
  margin-bottom: 20px;
  text-align: center;
  color: #333;
}

.report-description {
  font-size: 1.1rem;
  line-height: 1.8;
  color: #555;
  margin-bottom: 30px;
}

.report-btn {
  padding: 12px 28px;
  font-size: 1rem;
  background-color: #0070f3;
  color: #fff;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.report-btn:hover {
  background-color: #0059c1;
}