* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: "Inter", sans-serif;
    background-color: #ffffff;
    color: #000000;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }
  
  .container {
    width: 96%;
    padding: 0 2%;
    margin: 0 auto;
  }
  
  .main-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: #ffffff;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    transition: box-shadow 0.3s ease;
  }
  
  .main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .header-divider {
    border: none;
    height: 1px;
    background-color: #000000;
    margin: 0;
    width: 100%;
  }
  
  .nav-brand {
    position: relative;
    font-weight: 500;
    font-size: 1.5rem;
    color: #000000;
    text-decoration: none;
    display: inline-block;
  }
  
  .nav-brand span {
    transition: opacity 0.3s ease-in-out;
  }
  
  .nav-brand .brand-english {
    opacity: 0;
    position: absolute;
    top: 0;
    left: 0;
  }
  
  .nav-brand:hover .brand-korean {
    opacity: 0;
  }
  
  .nav-brand:hover .brand-english {
    opacity: 1;
  }
  
  .nav-links {
    display: flex;
    list-style: none;
    gap: 40px;
  }
  
  .nav-links a {
    text-decoration: none;
    color: #000000;
    font-size: 1.1rem;
    font-weight: 400;
    transition: opacity 0.3s ease;
  }
  
  .nav-links a.active {
    text-decoration: underline;
    text-underline-offset: 4px;
  }

  .nav-links a.active {
    text-decoration: underline;
    text-underline-offset: 4px;
  }
  
  hr {
    border: none;
    height: 1px;
    background-color: #e0e0e0;
    margin: 100px 0;
  }
  
  .main-content {
    max-width: 1200px;
    margin: 0 auto;
  }
  
  .about-hero {
    padding: 100px 0;
    text-align: left;
  }
  
  .about-hero h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 300;
    line-height: 1.4;
  }
  
  .intro-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
    align-items: center;
  }
  
  .intro-photo img {
    width: 100%;
    height: auto;
    display: block;
  }
  
  .intro-text h3 {
    font-size: 2rem;
    font-weight: 400;
    margin-bottom: 30px;
  }
  
  .intro-text p {
    font-size: 1.2rem;
    font-weight: 300;
    line-height: 1.7;
    color: #333;
  }
  
  .principles-section h2 {
    font-size: 2.5rem;
    font-weight: 400;
    margin-bottom: 60px;
  }
  
  .principles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
  }
  
  .principle-item {
    position: relative;
    padding: 25px;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
  }
  
  .principle-item:hover {
    border-color: #000;
    transform: translateY(-5px);
    background-color: #f9f9f9;
  }
  
  .principle-item h4 {
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 15px;
  }
  
  .principle-item p {
    font-size: 1.1rem;
    font-weight: 300;
    line-height: 1.6;
    color: #555;
  }
  
  .principle-icon {
    position: absolute;
    top: 25px;
    right: 25px;
    height: 40px;
    width: auto;
    opacity: 0;
    transform: scale(0.8);
    transition: all 0.3s ease;
  }
  
  .spark-icon {
    font-size: 40px;
    line-height: 1;
  }
  
  .principle-item:hover .principle-icon {
    opacity: 1;
    transform: scale(1);
  }
  
  .cta-section {
    text-align: center;
    padding: 120px 0;
  }
  
  .cta-section h2 {
    font-size: 2.5rem;
    font-weight: 400;
    margin-bottom: 20px;
  }
  
  .button-primary {
    text-decoration: none;
    padding: 12px 24px;
    border-radius: 50px;
    font-weight: 500;
    transition: all 0.3s ease;
    background-color: #000;
    color: #fff;
    display: inline-block;
  }
  
  .button-primary:hover {
    background-color: #333;
  }
  
  .modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 1;
    transition: opacity 0.3s ease;
  }
  
  .modal-hidden {
    opacity: 0;
    pointer-events: none;
  }
  
  .modal-content {
    background-color: #fff;
    padding: 40px;
    border-radius: 8px;
    max-width: 600px;
    width: 90%;
    position: relative;
    transform: scale(1);
    transition: transform 0.3s ease;
  }
  
  .modal-hidden .modal-content {
    transform: scale(0.95);
  }
  
  .modal-close-button {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: #888;
  }
  
  .modal-content h3 {
    font-size: 1.8rem;
    font-weight: 500;
    margin-bottom: 20px;
  }
  
  pre {
    background-color: #2d2d2d;
    color: #f8f8f2;
    padding: 20px;
    border-radius: 6px;
    overflow-x: auto;
    font-family: "Courier New", Courier, monospace;
  }
  
  .curiosity-list {
    list-style: none;
  }
  
  .curiosity-list li {
    font-size: 1.2rem;
    margin-bottom: 15px;
  }
  
  .curiosity-list li span {
    font-weight: 500;
    color: #000;
  }
  
  .user-stories {
    text-align: left;
  }
  
  .user-stories h4 {
    font-size: 1.1rem;
    font-weight: 500;
    margin-top: 20px;
    margin-bottom: 5px;
  }
  
  .user-stories p {
    font-size: 1.1rem;
    font-weight: 300;
    line-height: 1.6;
    color: #555;
    border-left: 2px solid #e0e0e0;
    padding-left: 15px;
  }
  
  @media (max-width: 768px) {
    .intro-grid {
      grid-template-columns: 1fr;
    }
  }