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

body {
  background: linear-gradient(135deg, #fff8e1, #ffecb3); /* Yellowish gradient */
  color: #333;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  text-align: center;
  padding: 2rem 1rem;
  background: linear-gradient(90deg, #f57c00, #fb8c00); /* darker warm orange shade */
  color: white;
  box-shadow: 0 6px 10px rgba(0,0,0,0.25);
}

header h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

header p {
  font-size: 1.2rem;
}

/* Intro Section */
.intro {
  padding: 2rem 1rem;
  text-align: center;
  max-width: 700px;
  margin: 2rem auto;
  background: #ffe082; /* slightly darker yellow for image visibility */
  border-radius: 12px;
  box-shadow: 0 6px 15px rgba(0,0,0,0.1);
}

.intro-img {
  width: 80px;
  margin-bottom: 1rem;
}

.intro h2 {
  font-size: 2rem;
  color: #ff9800;
  margin-bottom: 1rem;
}

.intro p {
  font-size: 1.1rem;
  color: #333;
  margin-bottom: 0.7rem;
}

/* Converter Section */
.converter-section {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  padding: 2rem 1rem;
  gap: 2rem;
}

/* Converter Card 3D */
.converter-card {
  background: #fffde7;
  padding: 2rem;
  border-radius: 16px;
  width: 380px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.25);
  transition: transform 0.3s, box-shadow 0.3s;
  text-align: center;
}

.converter-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 35px rgba(0,0,0,0.3);
}

.card-img {
  width: 60px;
  margin-bottom: 1rem;
}

/* Input Box */
.input-box, .unit-box {
  background: linear-gradient(135deg, #fff59d, #fff176); /* warm yellow input */
  padding: 1rem;
  border-radius: 10px;
  margin-bottom: 1rem;
  box-shadow: inset 0 3px 6px rgba(0,0,0,0.1);
}

.input-box label, .unit-box label {
  display: block;
  font-weight: 500;
  margin-bottom: 0.3rem;
}

.input-box input, .unit-box select {
  width: 100%;
  padding: 0.8rem;
  border-radius: 6px;
  border: 1px solid #ccc;
  font-size: 1.1rem;
  outline: none;
  transition: border 0.3s;
}

.input-box input:focus, .unit-box select:focus {
  border: 2px solid #ff9800;
}

/* Button */
.converter-card button {
  width: 100%;
  padding: 0.8rem;
  font-size: 1.1rem;
  border: none;
  border-radius: 8px;
  background: #ff9800;
  color: white;
  cursor: pointer;
  transition: background 0.3s, transform 0.3s;
}

.converter-card button:hover {
  background: #fb8c00;
  transform: translateY(-3px);
}

.result {
  margin-top: 1.5rem;
  font-size: 1.2rem;
  font-weight: 600;
  color: #ff6f00;
}

/* Tips Section */
.tips {
  max-width: 350px;
  background: #fff9c4;
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: 0 6px 15px rgba(0,0,0,0.15);
}

.tips h3 {
  color: #ff9800;
  margin-bottom: 1rem;
}

.tips ul {
  list-style: disc inside;
  max-height: 450px; /* keep box length same */
  overflow-y: auto;
}

.tips li {
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

/* Footer */
footer {
  background-color: #ff9800;
  color: white;
  text-align: center;
  padding: 1.5rem;
  font-size: 0.95rem;
  letter-spacing: 0.5px;
}

/* Responsive */
@media(max-width: 768px){
  .converter-section{
    flex-direction: column;
    align-items: center;
  }
}