* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    background-color: #1a202c; /* Simpler dark background */
    color: #e2e8f0;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    text-align: center;
    margin-bottom: 40px;
    color: #e2e8f0;
    padding: 40px 0;
}

.logo-container {
    margin-bottom: 30px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.logo {
    width: 80px; /* Adjusted logo size */
    height: 80px; /* Adjusted logo size */
    object-fit: contain;
    filter: drop-shadow(0 5px 10px rgba(0,0,0,0.3)); /* Slightly reduced shadow */
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: scale(1.05);
}

.header h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
    background: linear-gradient(135deg, #f7fafc, #cbd5e0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.2rem;
    font-weight: 300;
    opacity: 0.9;
    color: #a0aec0;
}

.main-content {
    background: rgba(45, 55, 72, 0.8);
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    overflow: hidden;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.content-wrapper {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 40px;
    padding: 40px;
    align-items: start;
}

.book-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.book-image img {
    max-width: 100%;
    height: auto;
    border-radius: 15px;
    box-shadow: 0 15px 30px rgba(0,0,0,0.4);
    transition: transform 0.3s ease;
}

.book-image img:hover {
    transform: scale(1.05);
}

.text-content h2 {
    font-size: 2.2rem;
    font-weight: 600;
    color: #f7fafc;
    margin-bottom: 20px;
    line-height: 1.3;
}

.intro {
    font-size: 1.1rem;
    color: #cbd5e0;
    margin-bottom: 30px;
    line-height: 1.7;
}

.features {
    margin-bottom: 30px;
}

.features h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: #f7fafc;
    margin-bottom: 15px;
}

.features ul {
    list-style: none;
    padding: 0;
}

.features li {
    font-size: 1rem;
    color: #cbd5e0;
    margin-bottom: 8px;
    padding-left: 10px;
}

.description {
    font-size: 1rem;
    color: #cbd5e0;
    margin-bottom: 30px;
    line-height: 1.7;
}

.highlights {
    margin-bottom: 40px;
}

.highlight {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
    padding: 15px;
    background: rgba(74, 85, 104, 0.3);
    border-radius: 10px;
    border-left: 4px solid #f6ad55;
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.emoji {
    font-size: 1.5rem;
    margin-right: 15px;
}

.highlight span:last-child {
    font-size: 1rem;
    color: #e2e8f0;
    font-weight: 500;
}

.download-section {
    text-align: center;
    margin-bottom: 30px;
}

.download-btn {
    display: inline-block;
    background: linear-gradient(135deg, #f6ad55 0%, #ed8936 100%);
    color: #1a202c;
    text-decoration: none;
    padding: 18px 40px;
    border-radius: 50px;
    font-size: 1.3rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 10px 25px rgba(246, 173, 85, 0.3);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 35px rgba(246, 173, 85, 0.4);
    background: linear-gradient(135deg, #ed8936 0%, #dd6b20 100%);
}

.download-btn:active {
    transform: translateY(-1px);
}

.social {
    text-align: center;
    padding: 20px;
    background: rgba(74, 85, 104, 0.2);
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.social p {
    font-size: 1rem;
    color: #cbd5e0;
}

.social a {
    color: #f6ad55;
    text-decoration: none;
    font-weight: 600;
}

.social a:hover {
    text-decoration: underline;
    color: #ed8936;
}

.footer {
    margin-top: 40px;
    padding: 30px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer p {
    font-size: 0.9rem;
    color: #a0aec0;
}

.back-btn {
    display: inline-block;
    background: linear-gradient(135deg, #4299e1 0%, #3182ce 100%);
    color: white;
    text-decoration: none;
    padding: 12px 24px;
    border-radius: 25px;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(66, 153, 225, 0.3);
}

.back-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(66, 153, 225, 0.4);
    background: linear-gradient(135deg, #3182ce 0%, #2c5282 100%);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .logo {
        width: 60px; /* Adjusted logo size for smaller screens */
        height: 60px; /* Adjusted logo size for smaller screens */
    }
    
    .header h1 {
        font-size: 2.2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .content-wrapper {
        grid-template-columns: 1fr;
        gap: 30px;
        padding: 30px 20px;
    }
    
    .text-content h2 {
        font-size: 1.8rem;
    }
    
    .intro {
        font-size: 1rem;
    }
    
    .download-btn {
        padding: 15px 30px;
        font-size: 1.1rem;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .logo {
        width: 50px; /* Adjusted logo size for even smaller screens */
        height: 50px; /* Adjusted logo size for even smaller screens */
    }
    
    .header h1 {
        font-size: 1.8rem;
    }
    
    .content-wrapper {
        padding: 20px 15px;
    }
    
    .text-content h2 {
        font-size: 1.5rem;
    }
    
    .download-btn {
        padding: 12px 25px;
        font-size: 1rem;
    }
    
    .back-btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
}

/* Smooth animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.main-content {
    animation: fadeInUp 0.8s ease-out;
}

.header {
    animation: fadeInUp 0.6s ease-out;
}

/* Hover effects for interactive elements */
.highlight:hover {
    background: rgba(74, 85, 104, 0.4);
    transform: translateX(5px);
    transition: all 0.3s ease;
}

.social:hover {
    background: rgba(74, 85, 104, 0.3);
    transition: all 0.3s ease;
}