/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "DejaVu Sans", Arial, sans-serif;    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

/* Header */
.header {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    color: white;
    padding: 2rem 0;
    text-align: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.header h1 {
    font-size: 3rem;
    font-weight: 300;
    letter-spacing: 2px;
    margin: 0;
}

/* Navigation */
.nav {
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    padding: 1rem 0;
    text-align: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav a {
    color: white;
    text-decoration: none;
    margin: 0 1rem;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    transition: all 0.3s ease;
    font-weight: 500;
}

.nav a:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 2rem auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    margin-bottom: 100px;
}

/* Sections */
.section {
    padding: 3rem;
    border-bottom: 1px solid #eee;
}

.section:last-child {
    border-bottom: none;
}

.section h2 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 2rem;
    font-weight: 300;
}

.subtitle {
    font-size: 1.3rem;
    color: #7f8c8d;
    font-weight: 300;
    text-align: center;
    margin-top: 1rem;
}

/* About section */
.about-content {
    display: flex;
    gap: 3rem;
    align-items: flex-start;
}

.profile-image {
    width: 300px;
    height: 400px;
    border-radius: 15px;
    object-fit: cover;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    flex-shrink: 0;
}

.about-text {
    flex: 1;
}

.about-text p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    line-height: 1.8;
}

/* Books section */
.book {
    margin-bottom: 3rem;
    padding: 2rem;
    background: #f8f9fa;
    border-radius: 15px;
    border-left: 5px solid #667eea;
    display: flex; /* Use flexbox for layout */
    align-items: flex-start; /* Align items to the top */
    gap: 20px; /* Space between image and text */
}

.book-content {
    flex: 1; /* Allow content to take remaining space */
}

.book-cover {
    max-width: 150px;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    flex-shrink: 0; /* Prevent image from shrinking */
}

.book h3 {
    font-size: 1.8rem;
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.book h4 {
    font-size: 1.3rem;
    color: #7f8c8d;
    font-weight: 400;
    margin-bottom: 0.5rem;
}

.publisher {
    font-weight: 600;
    color: #667eea;
    margin-bottom: 1rem;
}

.testimonials {
    margin-top: 2rem;
}

.testimonial {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    margin-bottom: 1rem;
    border-left: 4px solid #667eea;
    font-style: italic;
}

/* Research section */
.research-section {
    margin-bottom: 2.5rem;
    padding: 2rem;
    background: #f8f9fa;
    border-radius: 15px;
}

.research-section h3 {
    font-size: 1.6rem;
    color: #2c3e50;
    margin-bottom: 1rem;
}

/* Links */
a {
    color: #667eea;
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #764ba2;
    text-decoration: underline;
}

/* Footer */
.footer {
    background: rgba(0, 0, 0, 0.8);
    color: white;
    text-align: center;
    padding: 1rem;
    position: fixed;
    bottom: 0;
    width: 100%;
    backdrop-filter: blur(10px);
}

/* Responsive design */
@media (max-width: 768px) {
    .header h1 {
        font-size: 2rem;
    }
    
    .nav a {
        display: block;
        margin: 0.5rem 0;
    }
    
    .container {
        margin: 1rem;
        border-radius: 15px;
    }
    
    .section {
        padding: 2rem 1.5rem;
    }
    
    .about-content {
        flex-direction: column;
        text-align: center;
    }
    
    .profile-image {
        width: 250px;
        height: 350px;
        margin: 0 auto 2rem;
    }
    
    .section h2 {
        font-size: 2rem;
    }

    .book {
        flex-direction: column; /* Stack items vertically on small screens */
        align-items: center; /* Center items */
        text-align: center;
    }

    .book-cover {
        margin-bottom: 20px; /* Add space below image when stacked */
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.5rem;
    }
    
    .section {
        padding: 1.5rem 1rem;
    }
    
    .profile-image {
        width: 200px;
        height: 300px;
    }
    
    .book, .research-section {
        padding: 1.5rem;
    }
}