:root {
  --main-color: #ee722e;
  --sub1-color: #2E5F7F;
  --sub2-color: #fff5d3;
}

/* header */
header {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: white;
  padding: 10px 20px;
  z-index: 1001;
  margin: 0;
}

.logo-area {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.logo-area img {
  height: 50px;
}

.site-name {
  font-size: 24px;
  font-weight: bold;
  margin-left: 10px;
  color: black;
  text-decoration: none;
}

.paw {
  font-size: 24px;
  margin-left: 5px;
}

.nav-link {
  margin-left: clamp(10px, 2vw, 20px);
  font-size: clamp(14px, 2vw, 20px);
  text-decoration: none;
  color: black;
  font-weight: bold;
}

.sns-links {
  margin-left: clamp(10px, 2vw, 40px);
  display: flex;
  flex-direction: row;
}

.sns-links img {
  width: 30px;
  height: 30px;
  margin: auto 5px;
  cursor: pointer;
  transition: transform 0.2s ease;
}

.sns-links img:hover {
  transform: scale(1.1);
}

/* 全体設定 */
body {
  margin: 0;
  font-family: "Helvetica", "Arial", sans-serif;
  background-color: #fff;
  color: #333;
  line-height: 1.6;
  text-align: center;
}

/* ヘッダー */
.header {
  background-color: var(--main-color);
  padding: 40px 20px;
  height: clamp(250px, 30vw, 600px);
  color: white;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.ProbTree-logo-area {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 15px;
}

.ProbTree-logo {
  width: clamp(70px, 10vw, 170px);
}

.site-title {
  font-size: clamp(50px, 8vw, 200px);
  font-weight: bold;
}

.start-btn {
  margin-top: 20px;
  padding: 12px 32px;
  font-size: clamp(15px, 2vw, 25px);
  width: clamp(150px, 15vw, 200px);
  font-weight: bold;
  color: white;
  background-color: var(--sub1-color);
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

.start-btn:hover {
  transform: scale(1.1);
}

/* セクション共通 */
.draw-section {
  display: flex;
  background-color: white;
  flex-direction: row;
  padding: 20px 0;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.draw-img-container {
  width: 35%;
  /* border: solid 1px black; */
  height: clamp(300px, 50vw, 800px)
}

.draw-demo {
  height: 100%;
  margin-left: auto;
}

.draw-section-container {
  width: 55%;
  /* border: solid 1px black; */
  height: clamp(300px, 50vw, 800px)
}

.white-bg {
  background-color: #fff;
}

.light-bg {
  background-color: #fff5d3;
}

.study-section {
  display: flex;
  flex-direction: column;
  padding: 50px 0;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.study-section-title {
  font-size: clamp(70px, 8vw, 200px);
  color: var(--sub1-color);
  /* border: solid 1px black; */
  width: 90%;
  text-align: end;
  margin: 0;
}

.draw-section-title {
  font-size: clamp(70px, 8vw, 200px);
  color: var(--sub1-color);
  /* border: solid 1px black; */
  width: 100%;
  text-align: end;
  margin: 0;
}

.study-section-desc {
  color: var(--sub1-color);
  font-size: clamp(15px, 2vw, 30px);
  font-weight: bold;
  width: 90%;
  text-align: end;
  margin: 0;
}

.draw-section-desc {
  color: var(--sub1-color);
  font-size: clamp(15px, 2vw, 30px);
  font-weight: bold;
  width: 100%;
  text-align: end;
  margin: 0;
}

.section-desc {
  font-size: 16px;
  margin-bottom: 20px;
}

.section-title {
  font-size: 32px;
  font-weight: bold;
  margin-bottom: 10px;
}

.practice-section {
  display: flex;
  background-color: var(--sub2-color);
  flex-direction: column;
  padding: 20px 0;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.practice-section-title {
  font-size: clamp(70px, 8vw, 200px);
  color: var(--sub1-color);
  /* border: solid 1px black; */
  width: 90%;
  text-align: start;
  margin: 0;
}

.practice-section-desc {
  color: var(--sub1-color);
  font-size: clamp(15px, 2vw, 30px);
  font-weight: bold;
  width: 90%;
  text-align: start;
  margin: 0;
}

.practice-content-container {
  display: flex;
  flex-direction: row;
  justify-content: space-evenly;
  /* border: solid 1px black; */
  width: 90%;
}

.practice-demo {
  width: clamp(300px, 50%, 500px);
}

/* リンク */
.study-link-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 90%;
  text-align: end;
  margin-top: 20px;
  /* border: solid 1px black; */
}

.study-link {
  color: #ee722e;
  font-size: clamp(15px, 2vw, 30px);
  margin-left: auto;
  text-decoration: none;
  font-weight: bold;
}

.study-link:hover {
  color: var(--sub1-color);
}

/* PRACTICEリスト */
.practice-list {
  display: flex;
  flex-direction: column;
  list-style: none;
  padding: 0;
  font-size: clamp(15px, 2vw, 30px);
  font-weight: bold;
  justify-content: space-evenly;
  color: var(--main-color);
  /* border: solid 1px black; */
}

.practice-list-first {
  text-indent: 1rem;
  text-align: start;
}

.practice-list-others {
  text-align: center;
}

/* DRAWリスト */
.draw-list {
  display: flex;
  flex-direction: column;  
  text-align: end;
  margin-top: clamp(20px, 10vw, 70px);
  justify-content: space-between;
  height: clamp(50px, 10vw, 200px);
}

.draw-list-row {
  color: #ee722e;
  font-size: clamp(15px, 2vw, 30px);
  margin-left: auto;
  margin-top: 0;
  margin-bottom: 0;
  text-decoration: none;
  font-weight: bold;
}

/* フッター */
.footer {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 20px;
  background-color: var(--sub1-color);
  color: white;
  height: clamp(100px, 20vw, 350px);
  font-size: clamp(16px, 2vw, 32px);
  font-weight: 600;
}

.footer a {
  color: white;
  text-decoration: none;
}