header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 60px; /* Adjust header height */
  background: rgba(0, 0, 0, 0); /* Transparent background */
  z-index: 1000;
  display: flex;
  align-items: center;
  padding: 0 20px;
}

/* Logo container with hover effect */
.logo-container {
  padding-top: 30px;
  display: inline-block;
  position: relative;
  transition: all 0.3s ease-in-out;
}

.logo-container:hover {
  filter: drop-shadow(0 0 10px rgba(255, 255, 255, 0.5)); /* Glow around visible logo */
}

.logo {
  height: 50px; /* Adjust size as needed */
  width: auto;
}

/* -------------------------------------------------- */

body {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
  background-color: #1e1e1e;
  color: #eee;
  display: flex;
  flex-direction: row;
  height: 100vh;
}

/* Левая часть */
.left-side {
  flex: 1;
  background-color: #2a2a2a;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow: hidden; /* чтобы круг не выходил */
}

.left-side h1 {
  font-size: 2rem;
  text-align: center;
  max-width: 300px;
  line-height: 1.4;
  z-index: 1; /* выше круга */
}

/* Круг */
.circle {
  position: absolute;
  right: -200px; 
  bottom: -200px;
  width: 600px;
  height: 600px;
  background: #444;
  border-radius: 50%;
  opacity: 0.2;
  z-index: 0;
  pointer-events: none; /* чтобы клики проходили сквозь круг */
}

/* Правая часть */
.right-side {
  width: 400px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 20px;
  box-shadow: -5px 0 10px rgba(0,0,0,0.3);
  background-color: #1e1e1e;
}

.form-container {
  width: 100%;
  max-width: 300px;
}

.form-container h2 {
  margin-top: 0;
  text-align: center;
}

.form-group {
  margin-bottom: 15px;
  display: flex;
  flex-direction: column;
}

.form-group label {
  margin-bottom: 5px;
}

.form-group input {
  padding: 8px;
  border: none;
  border-radius: 6px;
  background-color: #2c2c2c;
  color: #eee;
}

button {
  background-color: #3a82f7;
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 10px 16px;
  cursor: pointer;
  font-size: 0.95rem;
  margin-top: 5px;
}
button:hover {
  background-color: #336dcf;
}

.switch-btn {
  background-color: transparent;
  color: #ccc;
  margin-top: 10px;
  border: none;
  text-decoration: underline;
  font-size: 0.8rem;
  cursor: pointer;
}

.hidden {
  display: none;
}
.visible {
  display: block;
}