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

body {
  overflow-x: hidden;
  font-family: "Trebuchet MS", "Lucida Sans Unicode", "Lucida Grande",
    "Lucida Sans", Arial, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

html {
  scroll-behavior: smooth;
}

.main-content {
  flex: 1;
}

.header {
  background-color: #3aafa9;
  padding: clamp(20px, 4vw, 40px) clamp(10px, 3vw, 40px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.profile_name {
  font-size: clamp(20px, 3vw, 25px);
  color: #17252a;
  font-weight: 500;
}

.topdiv {
  display: flex;
  gap: clamp(15px, 2vw, 20px);
  list-style: none;
}

.topmenu {
  position: relative;
  color: #17252a;
  padding: 8px 12px;
  font-size: clamp(15px, 2vw, 17px);
  text-decoration: none;
  border-radius: 5px;
  transition: all 0.3s ease;
  overflow: hidden;
}
.topmenu:hover {
  color: #def2f1;
}

.topmenu::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 3px;
  background: #def2f1;
  transition: width 0.4s ease;
}

.topmenu:hover::after {
  width: 100%;
}

.hamburger-menu {
  display: none;
  cursor: pointer;
  font-size: 24px;
  color: #17252a;
}

@media screen and (max-width: 768px) {
  .hamburger-menu {
    display: block;
  }

  .topdiv {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: #3aafa9;
    flex-direction: column;
    padding: 20px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  }

  .topdiv.active {
    display: flex;
  }
}