/* Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}

/* Background */
body {
  display: flex;
  justify-content: center;
  align-items: center;
  background: #0d0d0d;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: #f1f1f1;
  padding: 20px;
}

/* Main container */
.main {
  width: min(600px, 95%);
  background: #1a1a1a;
  padding: 32px;
  border-radius: 14px;
  box-shadow: 0 0 25px rgba(0, 255, 200, 0.25),
    inset 0 0 12px rgba(0, 255, 200, 0.15);
  text-align: center;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.main:hover {
  transform: scale(1.02);
  box-shadow: 0 0 40px rgba(0, 255, 200, 0.35),
    inset 0 0 14px rgba(0, 255, 200, 0.2);
}

/* Heading */
.main h1 {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  margin-bottom: 18px;
  color: #00ffc8;
  text-shadow: 0 0 6px rgba(0, 255, 200, 0.6);
  letter-spacing: 1px;
}

/* Advice box */
#display-advice {
  min-height: 80px;
  background: #111;
  border: 1px solid rgba(0, 255, 200, 0.25);
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 20px;
  font-size: clamp(1rem, 2vw, 1.2rem);
  line-height: 1.4;
  color: #e8fdf9;
  box-shadow: inset 0 0 12px rgba(0, 255, 200, 0.15);
  transition: opacity 0.3s ease;
}

/* Pop animation */
@keyframes glow {
  0% {
    opacity: 0;
    transform: scale(0.95);
  }
  70% {
    opacity: 1;
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}
#display-advice.pop {
  animation: glow 0.4s ease-out;
}

/* Button */
button {
  padding: 12px 26px;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  color: #0d0d0d;
  background: linear-gradient(90deg, #00ffc8, #00bfff);
  box-shadow: 0 0 12px rgba(0, 255, 200, 0.4);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
button:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 18px rgba(0, 255, 200, 0.6);
}
button:active {
  transform: translateY(0);
}

/* Responsive tweak */
@media (max-width: 420px) {
  .main {
    padding: 22px;
  }
  #display-advice {
    padding: 14px;
    min-height: 60px;
  }
  button {
    width: 100%;
  }
}