:root {
  --md-primary: #6750A4;
  --md-on-primary: #FFFFFF;
  --md-primary-container: #EADDFF;
  --md-surface: #FEF7FF;
  --md-surface-variant: #E7E0EC;
  --md-on-surface: #1D1B20;
  --md-on-surface-variant: #49454F;
  --md-error: #B3261E;
  --md-error-container: #F9DEDC;
  --md-outline: #79747E;
  --md-elevation-1: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
  --md-elevation-3: 0 4px 8px rgba(0,0,0,0.18), 0 2px 4px rgba(0,0,0,0.12);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Roboto', sans-serif;
  background: var(--md-surface);
  color: var(--md-on-surface);
  overflow: hidden;
  height: 100vh;
  width: 100vw;
  touch-action: none;
}

h1, h2 { font-family: 'Google Sans', sans-serif; margin: 0 0 8px; }

.screen {
  display: none;
  height: 100%;
  width: 100%;
  position: fixed;
  top: 0; left: 0;
}
.screen.active { display: flex; align-items: center; justify-content: center; }

.card {
  background: var(--md-surface);
  border-radius: 28px;
  padding: 32px 24px;
  box-shadow: var(--md-elevation-3);
  text-align: center;
  width: min(320px, 85vw);
}

.subtitle { color: var(--md-on-surface-variant); margin-bottom: 24px; }

input[type="text"] {
  width: 100%;
  padding: 16px;
  border-radius: 16px;
  border: 1px solid var(--md-outline);
  background: var(--md-surface-variant);
  font-size: 16px;
  margin-bottom: 16px;
  outline: none;
}
input[type="text"]:focus { border: 2px solid var(--md-primary); }

button {
  border: none;
  border-radius: 100px;
  padding: 14px 24px;
  font-size: 15px;
  font-weight: 500;
  font-family: 'Google Sans', sans-serif;
  cursor: pointer;
  width: 100%;
  transition: transform 0.1s ease, box-shadow 0.2s ease;
}
button:active { transform: scale(0.97); }

.btn-filled {
  background: var(--md-primary);
  color: var(--md-on-primary);
  box-shadow: var(--md-elevation-1);
}
.btn-tonal {
  background: var(--md-primary-container);
  color: var(--md-primary);
}
.btn-filled.danger { background: var(--md-error); }
.btn-tonal.danger { background: var(--md-error-container); color: var(--md-error); }

.call-actions { display: flex; gap: 12px; margin-top: 20px; }
.call-actions button { flex: 1; }

/* Radar */
#screen-radar { flex-direction: column; }
#radar-header {
  position: absolute;
  top: 0; left: 0; right: 0;
  display: flex;
  justify-content: space-between;
  padding: 16px 20px;
  z-index: 10;
  font-family: 'Google Sans', sans-serif;
  font-weight: 500;
}
#online-count { color: var(--md-on-surface-variant); }

#radar-viewport {
  position: absolute;
  inset: 0;
  overflow: hidden;
  background: radial-gradient(circle at center, #F3EDF7 0%, #E7E0EC 100%);
}

#radar-world {
  position: absolute;
  width: 2000px;
  height: 2000px;
  will-change: transform;
}

#radar-rings {
  position: absolute;
  top: 50%; left: 50%;
  width: 1px; height: 1px;
}
#radar-rings::before, #radar-rings::after {
  content: '';
  position: absolute;
  border: 1px solid rgba(103, 80, 164, 0.15);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}
#radar-rings::before { width: 300px; height: 300px; top: 0; left: 0; }
#radar-rings::after { width: 600px; height: 600px; top: 0; left: 0; }

#radar-sweep {
  position: absolute;
  top: 50%; left: 50%;
  width: 800px; height: 800px;
  margin-top: -400px; margin-left: -400px;
  border-radius: 50%;
  background: conic-gradient(from 0deg, rgba(103,80,164,0.25), transparent 40%);
  animation: sweep 4s linear infinite;
  pointer-events: none;
}
@keyframes sweep { to { transform: rotate(360deg); } }

.user-dot {
  position: absolute;
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--md-primary-container);
  color: var(--md-primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 11px;
  font-weight: 500;
  transform: translate(-50%, -50%);
  box-shadow: var(--md-elevation-1);
  cursor: pointer;
  transition: background 0.2s;
  text-align: center;
  padding: 4px;
  word-break: break-word;
}
.user-dot.self {
  background: var(--md-primary);
  color: var(--md-on-primary);
  z-index: 5;
}
.user-dot.busy {
  background: var(--md-error-container);
  color: var(--md-error);
  cursor: not-allowed;
  opacity: 0.6;
}

.hint {
  position: absolute;
  bottom: 20px;
  width: 100%;
  text-align: center;
  color: var(--md-on-surface-variant);
  font-size: 13px;
  margin: 0;
  z-index: 10;
}

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(29, 27, 32, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}
.overlay.hidden { display: none; }
.calling-label { color: var(--md-on-surface-variant); margin-bottom: 4px; }

#call-avatar {
  width: 80px; height: 80px;
  border-radius: 50%;
  background: var(--md-primary-container);
  margin: 0 auto 16px;
}
#call-timer { color: var(--md-on-surface-variant); margin-bottom: 8px; }