:root {
  /* main */
  --main-bg: #fef9f0;
  --main-text-color: #555;
  --black-color: #000;
  --accent-text-color: #333;
  --accent-bg-1:#a3c4bc;
  --accent-bg-2:#bbb;
  --accent-bg-3:#ccc;
  --hover-tab-bg: #fcefdc;
  --active-tab-bg:#e8e3dc;
  --card--bg: #f9f9f9;
  /* icon */
  --x-color : #b89eff; 
  --tiktok-color : #f391d0; 
  --youtube-color : #85e6d5; 
  --instagram-color : #fcd96b; 
  --bluesky-color :  #B7E1FA;
  --article-color : 	#AECBFA; 
  /* check */
  --check-color: gray;
}

body {
  background-color: var(--main-bg);
  font-family: 'Poppins', sans-serif;
  margin: 0;
  padding: 0;
}

.breadcrumb {
margin: 1em 2em;
font-size: 0.95rem;
color: #555;
}

.breadcrumb ol {
list-style: none;
display: flex;
flex-wrap: wrap;
gap: 0.5em;
padding: 0;
margin: 0;
}

.breadcrumb a {
text-decoration: none;
color: #333;
font-weight: 500;
}

.breadcrumb a:hover {
text-decoration: underline;
}

.breadcrumb li {
display: flex;
align-items: center;
}

.breadcrumb li::after {
content: "/";
margin: 0 0.4em;
color: #555;
}

.breadcrumb li:last-child::after {
content: "";
}

.twitter-tweet {
  color-scheme: dark; /* ダークモード対応 */
  margin: 0 auto !important;
}


.profile {
  text-align: center;
  padding: 0.5rem 2rem 0.5rem 2rem;
  max-width: 600px;
  margin: auto;
}

.avatar {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  border: 4px solid var(--black-color);
  margin-bottom: 0.5rem;
  transition: transform 0.2s ease;
}

.avatar:hover {
  transform: scale(1.1);
}

h1 {
  font-size: 2.7rem;
  font-weight: 800;
  color: var(--black-color);
}

.description {
  font-size: 1.3rem;
  color: var(--main-text-color);
  line-height: 1.6;
  margin-bottom: 4rem;
}

.scroll-anchor {
  position: relative;
  top: -2rem;
  height: 0;
}

.social-icons {
  display: flex;
  justify-content: center;
  flex-wrap: wrap; 
  gap: 1.5rem;
  max-width: 400px; 
  margin: 0 auto; 
}

.social-icons a {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 2.4rem;
  color: var(--black-color);
  text-decoration: none;
  border: 2px solid var(--black-color);
  transition: transform 0.2s ease;
}

.social-icons a:hover {
  transform: scale(1.1);
}
.x         { background-color: var(--x-color); } 
.tiktok    { background-color: var(--tiktok-color); } 
.youtube   { background-color: var(--youtube-color); } 
.instagram { background-color: var(--instagram-color); } 
.bluesky { background-color: var(--bluesky-color); } 
.article { background-color: var(--article-color); } 

.contents-card{
  /* background-color: var(--check-color); */
  text-align: center;
  padding: 0.5rem;
  max-width: 840px;
  margin: 0 auto;
  margin-bottom: 6rem;
}

.upload-gallery {
  text-align: center;
  margin: 0 auto;
  max-width:  840px;
}

.tab-content {
  margin-top: 1.0rem;
  display: none;
}

.tab-content.active {
  display: block;
}

.tab-header {
  margin-top: 2.0rem;
  display: flex;
  justify-content: center;
  overflow: hidden;
  width: fit-content;
  margin-inline: auto;
}


.tab-btn {
  background: none;
  border: none;
  color: var(--main-text-color);
  padding: 10px 25px;
  font-size: 1.5rem;
  font-weight: bolder;
  cursor: pointer;
  transition: all 0.1s ease;
}

.heading-line {
  width: 95%;
  max-width: 840px;
  height: 2px;
  background-color:  var(--main-text-color);
  margin: 0 auto;
}


.tab-btn:first-child {
  border-radius: 5px 0 0 0px;
}

.tab-btn:last-child {
  border-radius: 0 5px 0 0;
}

.tab-btn:hover {
  background-color: var(--hover-bg);
  transform: translateY(-2px);
  box-shadow: 0 5px 5px -2px rgba(0, 0, 0, 4); /* 下にだけ影を落とす */
}


.tab-btn.active {
  color: var(--main-text-color);
  background-color: var(--active-tab-bg);
}

/* Youtube Short */

.shorts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  column-gap: 1px;
  row-gap: 1px;
  justify-content: center; 
  
}

.short-video {
  width: 100%;
  border-radius: 1px;
  overflow: hidden;
  position: relative;
  
}

.short-video::before {
  content: '';
  display: block;
  padding-top: 177.7%; /* Maintain 9:16 aspect ratio for vertical video */
}

.short-video iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
  border-radius: 1px;
 
}

/* article */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px,1fr));
  gap: 1rem;
  max-width: 750px;
  margin: 1rem auto;
}

.card {
  display: block;
  background: var(--card--bg);
  /* padding: 1rem; */
  border-radius: 1px;
  text-decoration: none;
  color: var(--main-text-color);
  box-shadow: 0 0 8px rgba(0,0,0,0.1);
}

.card-content {
  padding: 1em;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.card h2 {
  font-size: 1rem;
  margin: 0.3em 0;
  color: var(--accent-text-color);
}

.card p {
  font-size: 0.9rem;
  color: var(--main-text-color);
  flex-grow: 1;
}

.card time {
  display: block;
  margin-top: 0.5em;
  font-size: 0.8rem;
  color: var(--accent-text-color-3);
}

.card:hover {
  box-shadow: 0 0 16px rgba(0,0,0,0.2);
}

/* X Post */

.posts-timeline {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.post-item {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  width: 100%;
  max-width: 800px;
  padding: 0.3rem;
}

.loading-spinner {
  border: 0.5rem solid var(--accent-bg-3);
  border-top: 0.5rem solid var(--accent-text-color);
  border-radius: 50%;
  width: 3rem;
  height: 3rem;
  animation: spin 1s linear infinite;
  margin: 11rem auto;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* SNS Links */
.sns-links {
  margin-top: 1rem;
  text-align: center;
  background: var(--card--bg);
  padding: 1rem;
  border-radius: 8px;
  box-shadow: 0 0 8px rgba(0,0,0,0.05);
  display: inline-block;
}
.sns-links i {
  margin-right: 0.3rem;
}
.sns-links a {
  display: inline-block;
  margin: 0.5rem 0.5rem 0 0.5rem;
  padding: 0.4rem 0.8rem;
  text-decoration: none;
  color: var(--black-color);
  font-weight: bold;
  font-size: 1.1rem;
  border-radius: 4px;
  transition: background-color 0.9s ease;
}

.sns-links a[href*="youtube"] {
  background-color: var(--youtube-color);
}
.sns-links a[href*="tiktok"] {
  background-color: var(--tiktok-color);
}
.sns-links a[href*="x.com"] {
  background-color: var(--x-color);
}
.sns-links a[href*="bsky.app"] {
  background-color: var(--bluesky-color);
}
.sns-links a[href*="article/"] {
  background-color: var(--article-color);
}

.sns-links::before {
  content: "💡最新のコンテンツはこちら";
  display: block;
  margin-bottom: 0.8rem;
  font-size: 1.2rem;
  font-weight: bold;
  color: var(--main-text-color);
}

.sns-links a:hover {
  transform: translateY(-2px) scale(1.05);
}



.footer {
  position: fixed;
  bottom: 0;
  width: 100%;
  padding: 5px 20px;
  background:var(--main-bg);
  z-index: 1000;
  pointer-events: none;
  box-sizing: border-box;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 100%;
  margin: 0 auto;
  padding: 10px 20px;
  position: relative;
  pointer-events: auto;
}

.footer-about {
  font-size: 20px;
  color: var(--accent-text-color);
  text-decoration: none;
  border-radius: 8px;
  padding: 5px;
  transition: all 0.1s ease;
}

.footer-about:hover {
  color: var(--main-bg);
  background-color:var(--accent-bg-2);
}

.footer-center {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  font-size: 20px;
  color: var(--accent-text-color);
  text-decoration: none;
}

/* about page */
.about-page{
  text-align: center;
  padding: 3.5rem 2rem;
  max-width: 600px;
  margin: auto;
}

.about-page header h1 {
  font-size: 2.1rem;
  text-align: center;
  margin-bottom: 2.5rem;
  line-height: 1.4;
}

.about-page section {
  max-width: 800px;
  margin: 20px auto;
  padding: 20px;
  font-size: 16px;
  line-height: 1.8;
}
.about-page section p{
  font-size: 1.3rem;
  color: var(--main-text-color);
  line-height: 2;
  margin-bottom: 2.5rem;
}


.about-page section h2 {
  font-size: 22px;
  margin-bottom: 15px;
  padding-left: 10px;
  color: var(--accent-text-color);
}


.footer-home {
  font-size: 20px;
  color: var(--accent-text-color);
  text-decoration: none;
  border-radius: 8px;
  padding: 5px;
  transition: all 0.1s ease;
}

.footer-home:hover {
  color: var(--main-bg);
  background-color:var(--accent-bg-2);
}


.footer-character {
  position: absolute;
  right: 20px;
  bottom: 10px;
  height: 200px;
  pointer-events: auto;
  transition: transform 0.2s ease;
}

.footer-character:hover {
  transform: scale(1.1);
}

.footer-search-articles {
  font-size: 20px;
  color: var(--accent-text-color);
  text-decoration: none;
  border-radius: 8px;
  padding: 5px;
  transition: all 0.1s ease;
}

.footer-search-articles:hover {
  color: var(--main-bg);
  background-color:var(--accent-bg-2);
}


/* responsive */
@media screen and (max-width: 768px) {

  .articles-grid {
    padding: 0 3rem;
  }

  .footer-about {
    font-size: 14px;
  }
  .footer-about:hover {
  color: var(--accent-bg-1);
  background-color:var(--accent-text-color);
  }
  .footer-home {
    font-size: 12px;
  }
  .footer-home:hover {
  color: var(--accent-bg-1);
  background-color:var(--accent-text-color);
  }

  .footer-search-articles {
    font-size: 12px;
  }

  .footer-search-articles:hover {
  color: var(--accent-bg-1);
  background-color:var(--accent-text-color);
  }

  .footer-center {
    font-size: 14px;
  }


  .footer-character {
    height: 100px;
    margin-bottom: -5px;
    right: 0px;  
  }

  .footer-content {
    padding: 0 10px;

  }
  .footer {
    position: fixed;
    padding: 10px 20px;
    background:var(--accent-bg-1);
    color: var(--accent-text-color);
    z-index: 1000;
    box-sizing: border-box;
  }
}

/* responsive  smart-phone */
@media screen and (max-width: 480px) {
  .profile {
    padding: 2rem 1rem;
  }

  h1 {
    font-size: 2rem;
  }

  .description {
    font-size: 1rem;
  }

  .social-icons a {
    width: 50px;
    height: 50px;
    font-size: 1.8rem;
  }

  .shorts-grid {
    grid-template-columns: 1fr;
  }

  .articles-grid {
    grid-template-columns: 1fr;
  }
}