:root {
    --primary: #2c3e50;
    --accent: #3498db;
    --bg: #f4f7f6;
    --card-bg: #ffffff;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg);
    color: var(--primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 40px;
}

#bookForm {
    background: var(--card-bg);
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 400px;
    margin-bottom: 40px;
}

#bookForm label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
}

#bookForm input {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 6px;
    box-sizing: border-box;
}

button {
    cursor: pointer;
    padding: 10px 15px;
    border: none;
    border-radius: 6px;
    transition: transform 0.2s, background 0.2s;
}

button[type="submit"] {
    background-color: var(--accent);
    color: white;
}

button[type="reset"] {
    background-color: #e74c3c;
    color: white;
}

button:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

#libraryDisplay {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    width: 100%;
    max-width: 1000px;
}

.book-card {
    background: var(--card-bg);
    padding: 20px;
    border-left: 5px solid var(--accent);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.book-card h3 {
    margin-top: 0;
    color: var(--accent);
}

.book-card p {
    margin: 5px 0;
    font-size: 0.95rem;
}