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

body {
  background: linear-gradient(135deg, #1f1f1f, #2c3e50);
  color: #fff;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  text-align: center;
  padding: 2rem 1rem;
  background: linear-gradient(to right, #0f2027, #203a43, #2c5364);
  color: white;
  box-shadow: 0 4px 8px rgba(0,0,0,0.4);
}

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

header p {
  font-size: 1rem;
  opacity: 0.8;
}

main.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 1.5rem;
  padding: 2rem;
  flex-grow: 1;
}

.card {
  position: relative;
  background: rgba(255, 255, 255, 0.08);
  padding: 1.5rem;
  border-radius: 15px;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(6px);
  transition: 0.3s ease;
  z-index: 1;
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  opacity: 0.12;
  z-index: 0;
}

.card:nth-child(1)::before {
  background-image: url("heart.jpg");
}
.card:nth-child(2)::before {
  background-image: url("diabetes.jpg");
}
.card:nth-child(3)::before {
  background-image: url("kidney.jpg");
}
.card:nth-child(4)::before {
  background-image: url("liver.jpg");
}

.card h2,
.card p,
.card a {
  position: relative;
  z-index: 2;
}

.card:hover {
  transform: scale(1.03);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

.card h2 {
  font-size: 1.6rem;
  margin-bottom: 0.8rem;
  color: #ffffff;
}

.card p {
  font-size: 0.95rem;
  margin-bottom: 1rem;
  opacity: 0.85;
}

.card a {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: linear-gradient(to right, #ff416c, #ff4b2b);
  color: white;
  border-radius: 6px;
  text-decoration: none;
  transition: background 0.3s ease;
}

.card a:hover {
  background: linear-gradient(to right, #ff4b2b, #ff416c);
}

footer {
  text-align: center;
  padding: 1rem;
  background: #111;
  font-size: 0.85rem;
  color: #aaa;
}

input.form-control,
select.form-select {
  background-color: rgba(255, 255, 255, 0.15);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

input.form-control::placeholder {
  color: #ccc;
}

select.form-select option {
  color: #000; /* so dropdown options are visible */
}