#NurseIQ {
  color: rgba(2, 14, 66, 0.993);
  text-align: center;
}

#NurseIQ a {
    text-decoration: none;
}

div > a {
    text-decoration: none;
}

/* General page */
body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f4f7fb;
    color: #1f2937;
}

/* Main heading */
h1 {
    text-align: center;
    margin-top: 40px;
    color: #12355b;
    font-size: 40px;
}

/* Intro image */
body > img {
    display: block;
    width: 220px;
    height: 150px;
    object-fit: cover;
    margin: 20px auto;
    border-radius: 15px;
}

/* Introduction text */
body > strong {
    display: block;
    text-align: center;
    max-width: 700px;
    margin: 20px auto;
    font-size: 18px;
}

/* Navigation */
nav {
    background: #12355b;
    padding: 15px;
    text-align: center;
}

nav a {
    text-decoration: none;
}

nav button {
    background: transparent;
    color: white;
    border: none;
    padding: 10px 16px;
    margin: 4px;
    cursor: pointer;
    font-size: 15px;
    border-radius: 8px;
}

nav button:hover {
    background: #1d6fa5;
}

/* Books container */
.books.section {
    max-width: 1100px;
    margin: 40px auto;
    padding: 20px;
    
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

/* Individual book cards */
.book {
    background: white;
    padding: 25px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    
    transition: transform 0.2s, box-shadow 0.2s;
}

.book:hover {
    transform: translateY(-7px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

/* Card headings */
.book h2 {
    color: #12355b;
    margin-top: 0;
}

/* Card paragraphs */
.book p {
    line-height: 1.6;
    color: #555;
}

/* Buy buttons */
.btn {
    background: #12355b;
    color: white;
    border: none;
    padding: 12px 22px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 15px;
}

.btn:hover {
    background: #1d6fa5;
    transform: scale(1.05);
}

/* Mobile */
@media (max-width: 600px) {
    h1 {
        font-size: 30px;
    }

    .books.section {
        grid-template-columns: 1fr;
        padding: 15px;
    }

    nav button {
        font-size: 13px;
        padding: 8px;
    }
}