* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }

  body {
    font-family: "Rounded Mplus 1c", "Hiragino Maru Gothic ProN", sans-serif;
    line-height: 1.7;
    background: linear-gradient(180deg, #f0faff, #fff5f9);
    color: #555;
  }

  header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: #ffffffcc;
    padding: 5px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid #e6f4ff;
    z-index: 1000;
  }
  
  header h1 {
    font-size: 1.5rem;
    color: #6bb7e9;
  }
.menu-toggle {
    display: none;
    font-size: 1.5rem;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1001;
    position: relative;
  }
  
  .nav-links {
    display: flex;
    gap: 20px;
  }

  @media (max-width: 768px) {
    .menu-toggle {
      display: block;
      z-index: 1000;
    }
    .nav-links {
        display: none;
        flex-direction: column;
        gap: 15px;
        width: 100%;
        background: #ffffffcc;
        padding: 15px 20px;
        border-radius: 12px;
        position: absolute;
        top: 50px;
        left: 0;
        z-index: 999;
        max-height: calc(100vh - 50px);
        overflow-y: auto;
    }
    .nav-links.active {
      display: flex;
    }
  }
    
  nav a {
    margin-left: 20px;
    text-decoration: none;
    font-weight: 600;
    color: #6bb7e9;
    transition: color 0.3s;
  }
  
  nav a:hover {
    color: #6bb7e9;
  }

  main {
    max-width: 800px;
    margin: 60px auto;
    padding: 0 20px;
  }
  
  section {
    margin-bottom: 20px;
  }

  #hero {
    text-align: left;
    padding: 60px 20px;
    background: #ffffff;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(180, 220, 255, 0.25);
  }
  
  .hero h2 {
    font-size: 1.8rem;
    color: #6bb7e9;
    margin-bottom: 10px;
  }
  
  .hero p {
    text-align: left;
    color: #555;
    line-height: 1.6;
    background: #ffffff;
    padding: 25px;
    border-radius: 16px;
    box-shadow: 0 8px 20px rgba(200, 230, 255, 0.25);
  }

  section h2 {
    font-size: 1.4rem;
    margin-bottom: 20px;
    color: #f29ac1;
  }

  #about p {
    background: #ffffff;
    padding: 25px;
    border-radius: 16px;
    box-shadow: 0 8px 20px rgba(200, 230, 255, 0.25);
  }
  .about {
    display: flex;
    align-items: flex-start;
    gap: 24px;
    background: #ffffff;
    padding: 25px;
    border-radius: 18px;
    box-shadow: 0 8px 25px rgba(200, 230, 255, 0.25);
  }
  
  .about-text h3 {
    color: #6bb7e9;
    margin-bottom: 10px;
  }
  
  .about-text p {
    color: #555;
    line-height: 1.6;
  }
  .slider {
    aspect-ratio: 3 / 4;
    width: 40%;        
    max-width: 250px;
    overflow: hidden;
    border-radius: 16px;
    flex: 0 0 auto; 
  }

  .slider-track {
    display: flex;
    width: 250%;
    transition: transform 0.6s ease;
  }

  .slider-track img {
    width: 40%;
    object-fit: cover;
  }
  @media (max-width: 600px) {
    .about {
      flex-direction: column;
      align-items: center;
      gap: 16px;
    }
    .about p {
      width: 100%;
    }
  }
  .project {
    background: #ffffff;
    padding: 25px;
    margin-top: 25px;
    border-radius: 18px;
    box-shadow: 0 8px 25px rgba(200, 230, 255, 0.25);
  }
  
  .project h3 {
    color: #6bb7e9;
    margin-bottom: 8px;
  }
  
  .project p {
    margin-bottom: 10px;
    color: #555;
  }
  
  .project a {
    display: inline-block;
    padding: 8px 16px;
    border-radius: 999px;
    background: linear-gradient(90deg, #8fd3f4, #fbc2eb);
    color: white;
    text-decoration: none;
    font-size: 0.9rem;
    transition: transform 0.2s, box-shadow 0.2s;
  }
  
  .project a:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(180, 200, 255, 0.25);
  }

  #contact p {
    background: #ffffff;
    padding: 25px;
    border-radius: 16px;
    box-shadow: 0 8px 20px rgba(200, 230, 255, 0.25);
  }
  
  #contact a {
    color: #ffffff;
    text-decoration: none;
    font-weight: 200;
  }

  footer {
    text-align: center;
    padding: 25px;
    background: #ffffffcc;
    border-top: 2px solid #ffe1ec;
    color: #999;
  }
  .project-img {
    width: 100%;
    border-radius: 14px;
    margin-bottom: 15px;
    box-shadow: 0 6px 18px rgba(180, 200, 255, 0.25);
  }
  .sea-project-img {
    width: 50%;
    border-radius: 14px;
    margin-bottom: 15px;
    box-shadow: 0 6px 18px rgba(180, 200, 255, 0.25);
  }

  #links {
    max-width: 800px;
    margin: 60px auto;
    padding: 0 20px;
  }
  
  #links h2 {
    color: #f29ac1;
    margin-bottom: 25px;
    text-align: center;
  }
  .repo-card {
    background: #fff;
    border-radius: 14px;
    padding: 20px;
    margin-bottom: 15px;
    box-shadow: 0 6px 20px rgba(180, 220, 255, 0.25);
  }
  .repo-card h3 a {
    color: #6bb7e9;
    text-decoration: none;
  }
  .hf-card {
    background: #fff;
    border-radius: 14px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 6px 20px rgba(200, 230, 255, 0.25);
    text-align: left;
  }
  .hf-card h3 a {
    color: #6bb7e9;
    text-decoration: none;
  }
  @media (max-width: 768px) {
    .hf-card {
      width: 100%;          
      box-sizing: border-box; 
      overflow-wrap: break-word; 
      word-break: break-all;   
      font-size: 0.9rem;    
      padding: 16px;        
    }
  }
  .grid-container {
    display: flex;
    flex-direction: column;
  }
  
  .qiita-card {
    background: #fff;
    border-radius: 14px;
    padding: 20px;
    margin-bottom: 15px;
    box-shadow: 0 6px 20px rgba(180, 220, 255, 0.25);
  }
  
  .card-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
  }
  
  .qiita-icon {
    width: 24px;
    height: 24px;
  }
  
  .user-name {
    font-weight: bold;
  }
  
  .qiita-card h3 {
    font-size: 16px;
    margin: 0 0 8px;
  }
  
  .qiita-card p {
    margin: 4px 0;
    font-size: 14px;
  }
  
  details {
    margin-top: 12px;
  }
  
  summary {
    cursor: pointer;
    font-weight: bold;
    margin-bottom: 12px;
  }

  .details-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
  }
  .scroll-animate {
    opacity: 0;
    transform: translateY(40px) rotate(-6deg) scale(0.95);
    transition:
      opacity 0.8s ease,
      transform 0.9s cubic-bezier(.25,1.4,.5,1);
  }
  
  .scroll-animate.is-visible {
    opacity: 1;
    transform: translateY(0) rotate(0deg) scale(1);
  } 
  @keyframes sway-smooth {
    0%   { transform: rotate(0deg); }
    10%  { transform: rotate(0.6deg); }
    25%  { transform: rotate(1.2deg); }
    40%  { transform: rotate(0.6deg); }
    50%  { transform: rotate(0deg); }
    60%  { transform: rotate(-0.6deg); }
    75%  { transform: rotate(-1.2deg); }
    90%  { transform: rotate(-0.6deg); }
    100% { transform: rotate(0deg); }
  }
  
  .sway {
    animation: sway-smooth 5s linear infinite;
    transform-origin: top center;
  }

.activities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
    margin-top: 24px;
  }
  
  .activity-card {
    background: #fff;
    border-radius: 18px;
    padding: 20px 22px;
    box-shadow: 0 6px 20px rgba(180, 220, 255, 0.3);
    position: relative;
  }
  
  .activity-date {
    font-size: 0.85rem;
    color: #6bb7e9;
  }
  
  .activity-card h3 {
    margin: 6px 0 10px;
    font-size: 1.05rem;
  }
  
  .activity-card p {
    font-size: 0.9rem;
    line-height: 1.6;
  }
  
  .activity-tag {
    display: inline-block;
    margin-top: 12px;
    padding: 4px 10px;
    font-size: 0.75rem;
    border-radius: 999px;
    background: #f0f8ff;
    color: #6bb7e9;
  }
  .falling-flower {
    position: fixed;
    top: -60px;
    pointer-events: none;
    z-index: 9999;
    font-size: 20px;
    animation-name: fall, sway;
    animation-timing-function: linear, ease-in-out;
    animation-iteration-count: 1, infinite;
  }
  @keyframes fall {
    to {
      transform: translateY(110vh) rotate(360deg);
      opacity: 0;
    }
  }
  @keyframes sway {
    0%   { margin-left: 0px; }
    50%  { margin-left: 140px; }
    100% { margin-left: 0px; }
  }

  header h1,
  section h2{
    display: inline-block;
  }

  @keyframes rotateYOnce {
    from {
      transform: rotateY(0deg);
    }
    to {
      transform: rotateY(720deg);
    }
  }
  
  .rotate-y {
    animation: rotateYOnce 1.8s cubic-bezier(.22,1,.36,1);
  }

#intro-canvas {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: black;
}

body.intro-playing {
  overflow: hidden;
}