@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;700&display=swap');

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

html, body {
  font-family: 'Roboto', sans-serif;
  background-color: #fff;
  color: #000;
}

header, main, footer {
  max-width: 1000px;
  margin: 0 auto;
  padding: 1rem;
}

.lang-select {
  margin-bottom: 1rem;
}

.lang-select label {
  margin-right: 0.5rem;
  font-weight: bold;
}

h1 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
}

.project-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.project {
  margin-bottom: 2rem;
}

.project h2 {
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
}

.project a {
  text-decoration: none;
  color: #007BFF;
}

.project a:hover {
  text-decoration: underline;
}

.iframe-container {
  width: 100%;
  max-width: 800px;
  margin: 1rem 0;
  aspect-ratio: 16 / 9;
  border: 2px solid #000;
  border-radius: 5px;
  overflow: hidden;
}

.iframe-container iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.back-btn {
  display: inline-block;
  margin-top: 1.5rem;
  padding: 0.5rem 1rem;
  background-color: #000;
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  border-radius: 5px;
  transition: background-color 0.3s ease;
}

.back-btn:hover {
  background-color: #444;
}