body {
  font-family: sans-serif;
  margin: 20px;
  background: #f4f5f7;
}
<!-- body { font-family: Arial, sans-serif; padding: 20px; } -->
.lang-btn { padding: 8px 14px; background:#007bff; color:#fff; border:none; border-radius:6px; cursor:pointer;}
.hidden { display: none; }

.header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 20px;
}

.lang-btn {
  padding: 8px 16px;
  background: #007bff;
  border: none;
  color: white;
  border-radius: 6px;
  cursor: pointer;
}

.box {
  background: white;
  padding: 18px;
  margin-bottom: 16px;
  border-radius: 12px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

/* container for profile box + photo */
.profile-box-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto 40px auto;
    padding: 20px;
    background: #ffffff;
    border-radius: 16px;
    box-shadow: 0 4px 14px rgba(0,0,0,0.08);
}

/* profile box */
.profile-box {
    flex: 1;
    padding: 5px;
}

/* photo */
.photo {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    overflow: hidden;
    flex-shrink: 0;
}

.photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.name {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.role {
    font-size: 1.2rem;
    margin-bottom: 20px;
    opacity: 0.9;
}

.role2 {
    font-size: 1.0rem;
    margin-bottom: 20px;
    opacity: 0.9;
}

/* top navigation */
.top-nav {
    border-radius: 16px;
    width: 100%;
    background: #ffffff;
    padding: 12px 20px;
    <!-- position: sticky; -->
    top: 0;
    z-index: 50;
    display: flex;
    justify-content: center;
    gap: 20px;
    border-bottom: 1px solid #ddd;
    box-shadow: 0 2px 6px rgba(0,0,0,0.05);
}

.top-nav a {
    color: #0077cc;
    text-decoration: none;
    font-weight: bold;
    font-size: 16px;
}

.top-nav a:hover {
    text-decoration: underline;
}

/* top navigation */
.bottom-nav {
    width: 100%;
    background: #ffffff;
    padding: 0px 1px;
    top: 0;
    z-index: 50;
    display: flex;
    justify-content: center;
    gap: 20px;
    border-bottom: 1px solid #ddd;
    box-shadow: 0 2px 6px rgba(0,0,0,0.05);
}

details {
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 10px;
  background: #fafafa;
  margin-bottom: 12px;
}

summary {
  cursor: pointer;
  font-weight: bold;
  list-style: none;
}

summary::marker {
  display: none;
}

summary:after {
  content: "▶";
  float: right;
  transition: transform 0.2s;
}

details[open] summary:after {
  transform: rotate(90deg);
}

/* mobile */
@media (max-width: 650px) {
    .profile-box-row {
        flex-direction: column-reverse;
        align-items: center;
        text-align: center;
    }
    .photo {
        width: 130px;
        height: 130px;
        margin: 0 0 15px 0;
    }
    .top-nav {
        flex-wrap: wrap;
        gap: 12px;
    }
}