:root {
  --bg: #f5f5f5;
  --fg: #000;
}

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

html {
  font-size: 16px;
}

body {
  font-family: 'Segoe UI', Tahoma, sans-serif;
  background: var(--bg);
  color: var(--fg);
  padding: 1rem;
}

/* Navigation */
.top-nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: white;
  gap: 1rem;
  padding: 1rem;
}

@media (min-width: 600px) {
  .top-nav {
    flex-direction: row;
    justify-content: space-between;
  }
}

.top-nav h1 {
  font-size: 2rem;
  font-weight: bold;
  color: var(--fg);
  text-align: center;
}

/* Buttons */
.nav-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
}

.nav-btn {
  padding: .6rem 1.6rem;
  background: var(--bg);
  border-radius: 999px;
  color: var(--fg);
  transition: background .3s, color .3s;
  text-align: center;
  min-width: 130px;
  font-size: 1rem;
  white-space: nowrap;
}

.nav-btn.active,
.nav-btn:hover {
  background: var(--fg);
  color: white;
}

/* Main Content */
.content {
  max-width: 100%;
  padding: 1rem;
  margin: auto;
  font-size: 1rem;
  line-height: 1.6;
}

@media (min-width: 768px) {
  .content {
    max-width: 750px;
  }
}
@media (min-width: 1024px) {
  .content {
    max-width: 950px;
  }
}

.lang-switcher {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
}

.lang-btn {
  background: var(--bg);
  border: 1px solid var(--fg);
  color: var(--fg);
  padding: 0.4rem 1rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.9rem;
}
.lang-btn.active {
  background: var(--fg);
  color: white;
}