body {
  font-family: "Noto Sans JP", Arial, "Yu Gothic", Meiryo, sans-serif;
  color: #383e45;
  margin:0;
  padding:0;
}
h1{
  font-size:1.75rem;
}
a {
  text-decoration: none;
  color:black;
}
li {
  list-style: none;
}
ul{
  padding: 0;
}
img{
  width:100%;
}
*, *::before, *::after {
  box-sizing: border-box;
}
.wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  margin: 0 auto;  
  background-color: 	#faffff;
}
/* ヘッダー部分*/
header{
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top:0;
  left:0;
  height:60px;
  background-color:#143658;
  box-shadow: 0 5px 7px rgba(0, 0, 0, 0.15);
  font-family: "Arial";
}
.header__logo{
  margin-left:1.5rem;
  color:#ffffff;
  font-size:1.4rem;
  font-weight: bold;
  display: inline-block;
  transition: color 0.1s ease;
}
.header__logo img{
  width: 1.9rem;
  height: 1.9rem;
  margin-right:0.2rem;
  vertical-align: middle;
  border-radius: 8px;
}
.header__logo:hover{
  color: #d4f9ff;
}
.header__nav--large{
  display: none;
}
/* ── ハンバーガーボタン ── */
.hamburger-btn {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  width: 1.5rem;
  height: 1.5rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 100; 
  margin-left: auto;
  margin-right: 1rem;
}
.hamburger-btn .hamburger-bar {
  width: 100%;
  height: 0.2rem;
  background-color: #ffffff;
  border-radius: 2px;
  transition: all 0s ease;
}
/* ── 開いたとき ── */
.header__nav.is-open {
  transform:translateX(0);
}
/* ── 開閉アニメーション ── */
.hamburger-btn.is-active .hamburger-bar:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}
.hamburger-btn.is-active .hamburger-bar:nth-child(2) {
  opacity: 0;
}
.hamburger-btn.is-active .hamburger-bar:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}
/* ── モバイルナビ ── */
.header__nav {
  position: fixed;
  top: 60px; left: 0;
  transform-origin: top center;
  width: 100%;
  background: #fff;
  transform: translateX(-200%);
  transition: transform 0s ease;
}
.header__nav ul {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0;
  margin: 0;
}
.header__nav li{
  width:100%;
  display:flex;
  align-items: center;
  padding:0 1.25rem;
  border-bottom: 2px dashed #e6e6e6;
}
.header__nav ul li a {
  color:#143658;
  width: 100%;
  padding: 1rem 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1rem;
}



/* メイン部分*/
main{
  flex: 1 0 auto;
}

/* フッター部分*/
footer{
  background-color:white;
  display: flex;
  flex-direction: column;
  text-align: center;
  align-items: center;
  height: 50px; 
  width: 100%;
  margin-top: 3rem;
  border-top:#353535 solid 1px;   
}
footer a{
  padding-top:0.5rem;
}
.footer__nav{
  display: flex;
  justify-content: center;
  gap: 5rem;
  margin:0.5rem 0;
}

.footer__nav a{
  color: #666;
  font-size: 0.9rem;
}
.footer__logo{
  color: #143658;
  font-size: 1.5rem;
  font-weight: bold;
  font-family: "Arial";
  display: inline-block;
  margin-bottom:0.5rem;
}
.footer__copyright{
  font-size: 0.9rem;
  color: #666;
  padding-bottom: 0.5rem;
  margin-top:0.3rem;
}

/* PC用レスポンシブ */
@media screen and (min-width: 768px) {
/* ヘッダー部分*/
  header{
    box-shadow: 0 5px 7px rgba(0, 0, 0, 0.15);
    height:75px;
    padding:0 30px;
  }
  .header__logo{
    font-size:1.75rem;
  }
  .header__logo:hover{
    color: #d4f9ff;
  }
  .header__nav--large{
    display: flex;
    gap: 1rem;
    margin-right:2rem;
  }
  .header__nav--large a{
    font-size:1rem;
    color:white;
  }
  .header__hamburger {
    display: none;
  }

  /* フッター部分*/
  footer{
    margin-top:0;
  }
  .footer__copyright{
    height: 40px;
    line-height: 40px;
    margin:0;
    padding:0;
  }
  .footer__nav, .footer__logo{
    display:none;
  }
}