:root {
  --primary-bg: #2c2a3e;
  --container-bg: rgba(30, 28, 45, 0.8);
  --text-light: #e0e0e0;
  --text-dark: #a0a0a0;
  --accent-primary: #8a4fff;
  --accent-hover: #a174ff;
  --input-bg: #1e1c2d;
  --btn-bg: #f0f0f0;
  --btn-text: #1e1c2d;
  --error-color: #ff6b6b;
}

body {
  font-family: "Poppins", sans-serif;
  background-color: var(--primary-bg);
  color: var(--text-light);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  background-image: radial-gradient(
    circle at top left,
    rgba(138, 79, 255, 0.2),
    transparent 40%
  );
}

.lobby-container {
  background-color: var(--container-bg);
  padding: 2.5rem 3rem;
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  width: 100%;
  max-width: 450px;
  text-align: center;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  font-weight: 700;
}

.username-container {
  margin-bottom: 1.5rem;
}

.username-container label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-dark);
}

input[type="text"],
select {
  width: 100%;
  padding: 0.8rem 1rem;
  background-color: var(--input-bg);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  color: var(--text-light);
  font-size: 1rem;
  box-sizing: border-box;
  transition: border-color 0.3s, box-shadow 0.3s;
}

input[type="text"]:focus,
select:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(138, 79, 255, 0.3);
}

.tabs {
  display: flex;
  justify-content: center;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.tab-link {
  background: none;
  border: none;
  color: var(--text-dark);
  padding: 0.8rem 1.2rem;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  transition: color 0.3s, background-color 0.3s;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px; /* Align with container border */
}

.tab-link.active {
  color: var(--text-light);
  border-bottom-color: var(--accent-primary);
}

.tab-content {
  display: none;
}

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

.tab-content h3 {
  font-size: 1.5rem;
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.tab-content p {
  color: var(--text-dark);
  margin-top: 0;
  margin-bottom: 1.5rem;
}

.form-group {
  margin-bottom: 1.5rem;
  text-align: left;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text-dark);
}

.btn {
  background-color: var(--btn-bg);
  color: var(--btn-text);
  border: none;
  padding: 0.9rem 1.5rem;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  width: 100%;
  transition: background-color 0.3s, transform 0.2s;
}

.btn:hover {
  background-color: #dcdcdc;
  transform: translateY(-2px);
}

.error {
  color: var(--error-color);
  margin-top: 1rem;
  height: 1.2em;
  font-weight: 600;
}