:root {
  --primary: #bb86fc;
  --primary-variant: #3700b3;
  --secondary: #03dac6;
  --background: #121212;
  --surface: #1e1e1e;
  --error: #cf6679;
  --on-primary: #000000;
  --on-secondary: #000000;
  --on-background: #ffffff;
  --on-surface: #ffffff;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Poppins', sans-serif;
  background-color: var(--background);
  color: var(--on-background);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Background Animation */
.bg-animation {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background: radial-gradient(circle at 50% 50%, #1a1a2e 0%, #121212 100%);
}

.blob {
  position: absolute;
  width: 500px;
  height: 500px;
  background: var(--primary);
  filter: blur(80px);
  opacity: 0.1;
  border-radius: 50%;
  animation: move 20s infinite alternate;
}

.blob-1 {
  top: -100px;
  left: -100px;
}

.blob-2 {
  bottom: -100px;
  right: -100px;
  background: var(--secondary);
  animation-delay: -5s;
}

.blob-3 {
  top: 50%;
  left: 50%;
  background: #ff79c6;
  animation-delay: -10s;
}

@keyframes move {
  from {
    transform: translate(0, 0) scale(1);
  }

  to {
    transform: translate(100px, 100px) scale(1.1);
  }
}

/* Container & Header */
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 20px;
  width: 100%;
}

.header {
  text-align: center;
  margin-bottom: 40px;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
  margin-bottom: 10px;
}

.logo-icon {
  font-size: 40px;
}

h1 {
  font-size: 48px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  color: var(--text-dim);
  opacity: 0.8;
}

/* Home Button */
.home-button {
  position: absolute;
  top: 20px;
  left: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--on-background);
  text-decoration: none;
  font-weight: 600;
  opacity: 0.7;
  transition: var(--transition);
  z-index: 100;
}

.home-button:hover {
  opacity: 1;
  transform: translateX(-5px);
}

/* Config Card */
.config-card {
  background: var(--surface);
  border-radius: 24px;
  padding: 40px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.config-header {
  margin-bottom: 30px;
}

.config-header h2 {
  font-size: 24px;
  margin-bottom: 5px;
}

.config-header p {
  color: var(--text-dim);
  font-size: 14px;
  opacity: 0.6;
}

.config-section {
  margin-bottom: 30px;
}

.config-label {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 15px;
  font-weight: 600;
}

.label-icon {
  font-size: 20px;
}

/* Radio Grid */
.radio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 12px;
}

.radio-card {
  cursor: pointer;
  position: relative;
}

.radio-card input {
  position: absolute;
  opacity: 0;
}

.radio-content {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  padding: 20px 15px;
  text-align: center;
  transition: var(--transition);
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.radio-icon {
  font-size: 24px;
  margin-bottom: 8px;
}

.radio-label {
  font-weight: 700;
  font-size: 14px;
  margin-bottom: 4px;
}

.radio-description {
  font-size: 11px;
  opacity: 0.5;
  line-height: 1.2;
}

.radio-card input:checked+.radio-content {
  background: rgba(187, 134, 252, 0.1);
  border-color: var(--primary);
  box-shadow: 0 0 20px rgba(187, 134, 252, 0.2);
}

.disabled-mode {
  opacity: 0.4;
  pointer-events: none;
}

.config-divider {
  height: 1px;
  background: rgba(255, 255, 255, 0.1);
  margin: 30px 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Start Button */
.start-button {
  width: 100%;
  padding: 18px;
  border-radius: 16px;
  border: none;
  background: linear-gradient(135deg, var(--primary), var(--primary-variant));
  color: var(--on-primary);
  font-family: 'Poppins', sans-serif;
  font-size: 18px;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 10px 20px rgba(187, 134, 252, 0.3);
}

.start-button:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 30px rgba(187, 134, 252, 0.4);
  filter: brightness(1.1);
}

.start-button:active {
  transform: translateY(-1px);
}

/* Footer */
.footer {
  text-align: center;
  margin-top: 40px;
  opacity: 0.5;
  font-size: 13px;
}

/* Responsive */
@media (max-aspect-ratio: 1/1) {
  .logo h1 {
    font-size: 32px;
  }

  .config-card {
    padding: 25px;
  }

  .radio-grid {
    grid-template-columns: 1fr;
  }
}

/* Input group for lobby */
.input-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.input-group label {
  font-size: 14px;
  font-weight: 600;
  opacity: 0.8;
}

.input-group input,
#roomInput {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: 15px;
  color: white;
  font-family: inherit;
  font-size: 16px;
  outline: none;
  transition: var(--transition);
  width: 100%;
}

#roomInput {
  text-transform: uppercase;
}

.input-group input:focus,
#roomInput:focus {
  border-color: var(--primary);
  background: rgba(255, 255, 255, 0.08);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 15px;
  border-radius: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
}