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

body {
  height: 100vh;
  background: linear-gradient(135deg, #0f172a, #1e293b, #020617);
  display: flex;
  justify-content: center;
  align-items: center;
  color: #fff;
}

.container {
  backdrop-filter: blur(15px);
  background: rgba(255, 255, 255, 0.05);
  border-radius: 20px;
  padding: 40px;
  width: 420px;
  text-align: center;
  box-shadow: 0 0 40px rgba(0,0,0,0.6);
  border: 1px solid rgba(255,255,255,0.1);
}

/* Title */
h1 {
  margin-bottom: 20px;
  font-size: 24px;
}

/* 🔽 Custom Dropdown */
select {
  width: 100%;
  padding: 12px;
  border-radius: 10px;
  border: none;
  outline: none;
  background: #1e293b;
  color: #fff;
  font-size: 14px;
  cursor: pointer;

  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;

  background-image: url("data:image/svg+xml;utf8,<svg fill='white' height='20' viewBox='0 0 20 20' width='20' xmlns='http://www.w3.org/2000/svg'><path d='M5 7l5 5 5-5z'/></svg>");
  background-repeat: no-repeat;
  background-position: right 12px center;
}

/* Buttons */
button {
  margin-top: 12px;
  padding: 10px 14px;
  border-radius: 10px;
  border: none;
  background: linear-gradient(135deg, #22c55e, #16a34a);
  color: white;
  font-weight: 500;
  cursor: pointer;
  transition: 0.3s;
}

button:hover {
  transform: scale(1.05);
  box-shadow: 0 0 15px rgba(34,197,94,0.6);
}

/* Timer */
#timer {
  margin-top: 15px;
  font-size: 22px;
  color: #facc15;
}

/* Display */
#display {
  margin: 20px 0;
  font-size: 28px;
  letter-spacing: 6px;
  min-height: 40px;
}

/* Input */
input {
  width: 100%;
  padding: 12px;
  border-radius: 10px;
  border: none;
  outline: none;
  background: #020617;
  color: white;
  margin-top: 10px;
}

/* Result */
#result {
  margin-top: 15px;
  font-size: 16px;
  font-weight: 500;
}