* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family:
    Arial,
    sans-serif;

  background: #0f172a;
  color: #e2e8f0;
}

.container {
  width: 100%;
  max-width: 700px;
  margin: auto;
  padding: 30px 20px;
}

h1 {
  margin-bottom: 5px;
}

.subtitle {
  color: #94a3b8;
  margin-top: 0;
}

.card {
  background: #1e293b;
  padding: 22px;
  border-radius: 12px;
  margin-top: 20px;
}

label {
  display: block;
  margin-top: 18px;
  margin-bottom: 7px;
  font-weight: bold;
}

input,
select {
  width: 100%;
  padding: 12px;
  border: 1px solid #475569;
  border-radius: 7px;
  background: #0f172a;
  color: white;
  font-size: 16px;
}

.input-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.input-row input {
  flex: 1;
}

.input-row span {
  width: 30px;
}

button {
  width: 100%;
  margin-top: 25px;
  padding: 13px;
  border: none;
  border-radius: 7px;
  background: #16a34a;
  color: white;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
}

button:hover {
  opacity: 0.9;
}

.message {
  margin-top: 15px;
  text-align: center;
}

.sensor {
  background: #0f172a;
  padding: 15px;
  border-radius: 8px;
  margin-top: 12px;
}

.sensor-title {
  font-weight: bold;
  margin-bottom: 8px;
}

.sensor-value {
  font-size: 28px;
  font-weight: bold;
}

.sensor-time {
  margin-top: 7px;
  font-size: 13px;
  color: #94a3b8;
}