* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", Arial, sans-serif;
}

body {
  min-height: 100vh;
  background: radial-gradient(circle at top, #1f2933, #000);
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

.phone-box {
  width: 100%;
  max-width: 380px;
  background: linear-gradient(145deg, #facc15, #eab308);
  border-radius: 16px;
  padding: 20px;
  border: 5px solid #3f3f46;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.9);
}

.phone-header {
  background: linear-gradient(180deg, #4b5563, #1f2933);
  color: white;
  text-align: center;
  padding: 12px;
  font-weight: bold;
  letter-spacing: 2px;
  border-radius: 10px;
  margin-bottom: 14px;
}

.screen {
  background: #020617;
  color: #22c55e;
  padding: 14px;
  border-radius: 10px;
  text-align: center;
  margin-bottom: 12px;
  border: 3px inset #334155;
}

.label {
  font-size: 0.75rem;
  color: #cbd5f5;
}

#time {
  font-size: 2rem;
  letter-spacing: 3px;
}

.number-display {
  background: #e5e7eb;
  border-radius: 8px;
  padding: 10px;
  margin-bottom: 14px;
  font-weight: bold;
  letter-spacing: 2px;
  text-align: center;
  border: 2px inset #6b7280;
  min-height: 36px;
}

.keypad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}

.keypad button {
  padding: 14px;
  font-size: 1rem;
  font-weight: bold;
  background: #f9fafb;
  border-radius: 8px;
  border: 2px solid #6b7280;
  cursor: pointer;
}

.keypad button:active {
  transform: scale(0.95);
}

.controls {
  display: flex;
  justify-content: center;
  margin-bottom: 10px;
}

.controls button {
  padding: 12px 20px;
  font-size: 0.9rem;
  font-weight: bold;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  background: #fde047;
}

#status {
  margin-top: 10px;
  text-align: center;
  font-size: 0.9rem;
  font-weight: 500;
}

/* Responsive */
@media (min-width: 768px) {
  .phone-box {
    max-width: 420px;
  }
}