body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  background: #1a1a1a;
  font-family: 'Poppins', sans-serif;
  color: #fff;
}

.header {
  width: 100%;
  padding: 2rem 0;
  text-align: center;
  background: #111;
  margin-bottom: 2rem;
}

.main-title {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: 2px;
  color: #00bfff;
  margin-bottom: 0.5rem;
}

.subtitle {
  font-size: 1.2rem;
  color: #e0e0e0;
  font-weight: 400;
  letter-spacing: 1px;
}

.wrapper {
  width: min-content;
  margin: 40px auto;
  display: flex;
  gap: 20px;
}
.column-zero,
.column-one,
.column-two,
.column-three,
.column-four {
  display: flex;
  flex-direction: column;
  gap: 20px;
  background-color: #233140;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.5);
  padding: 20px;
  border-radius: 8px;
}
.container {
  width: 500px;
  box-sizing: border-box;
  background-color: #2c3e50;
  border-radius: 10px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
  margin-bottom: 20px;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  align-items: stretch;
}
.container h1 {
  font-size: 25px;
  margin: 0 0 16px 0;
  text-align: center;
  color: #fff;
}
.value-container {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
  width: 100%;
}
.value-container span {
  flex: 1 1 0;
  text-align: left;
  margin-right: 10px;
  font-size: 16px;
  color: #fff;
}
.value-container input[type="text"] {
  width: 70px;
  padding: 8px;
  border-radius: 5px;
  border: 1px solid #444;
  margin-left: 0;
  font-size: 1rem;
  background: #1a1a1a;
  color: #fff;
  transition: all 0.3s ease;
}

.value-container input[type="text"]:focus {
  outline: none;
  border-color: #00bfff;
  box-shadow: 0 0 5px #00bfff;
}
.button {
  padding: 0.5rem 1rem;
  background-color: #00bfff;
  color: #111;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  transition: all 0.3s ease;
}

.button.on {
  background-color: #d9534f;
  color: #fff;
}
.result {
  font-size: 1.2rem;
  color: #00bfff;
  margin-top: 20px;
  text-align: center;
  font-weight: 600;
}
.inline-container {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
}

.column-container {
  display: flex;
  justify-content: flex-start;
  align-items: flex-start;
  gap: 20px;
  min-width: 2580px;
  overflow-x: auto;
  padding: 0 20px;
  box-sizing: border-box;
}

.column-content {
  display: none;
}

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

.menu {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  margin-top: 2rem;
  margin-bottom: 2rem;
}

.menu button {
  padding: 0.8rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border: 2px solid #00bfff;
  background-color: transparent;
  color: #00bfff;
  cursor: pointer;
  transition: all 0.3s ease;
  border-radius: 5px;
  box-shadow: 0 4px 8px rgba(0, 191, 255, 0.2);
}

.menu button:hover {
  background-color: #00bfff;
  color: #111;
  box-shadow: 0 6px 12px rgba(0, 191, 255, 0.4);
}

.menu button.active {
  background-color: #00bfff;
  color: #111;
  box-shadow: 0 6px 12px rgba(0, 191, 255, 0.4);
}

@media (max-width: 900px) {
  .column-container {
    min-width: 100%;
    flex-direction: column;
    align-items: center;
    overflow-x: hidden;
  }

  .menu {
    display: flex;
    flex-wrap: wrap;
  }
}