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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
}

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

/* Navigation */
header {
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #2c3e50;
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: #2c3e50;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: #3498db;
}

/* Hero section */
.hero {
    padding: 8rem 2rem 4rem;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.profile-image {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    margin-bottom: 2rem;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    object-fit: cover;
}

.hero h1 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 1rem;
}

.hero h2 {
    font-size: 1.5rem;
    color: #34495e;
    margin-bottom: 1rem;
}

.tagline {
    font-size: 1.2rem;
    color: #7f8c8d;
    margin-bottom: 2rem;
}

/* Sections */
section {
    padding: 4rem 0;
}

section h2 {
    font-size: 2rem;
    color: #2c3e50;
    margin-bottom: 2rem;
    text-align: center;
}

/* Publications */
.publication-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.publication-card {
    background: #fff;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.publication-card:hover {
    transform: translateY(-5px);
}

.publication-card h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

/* Services */
.services {
    background-color: #f8f9fa;
}

.services p {
    max-width: 800px;
    margin: 0 auto 2rem;
    text-align: center;
}

/* Buttons */
.cta-button {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    background-color: #3498db;
    color: #fff;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.cta-button:hover {
    background-color: #2980b9;
}

/* Footer */
footer {
    background-color: #2c3e50;
    color: #fff;
    padding: 2rem 0;
}

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

.social-links a {
    color: #fff;
    font-size: 1.5rem;
    margin-left: 1rem;
    transition: color 0.3s ease;
}

.social-links a:hover {
    color: #3498db;
}

/* Mobile menu */
.burger {
    display: none;
    cursor: pointer;
}

.burger div {
    width: 25px;
    height: 3px;
    background-color: #2c3e50;
    margin: 5px;
    transition: all 0.3s ease;
}

/* Responsive design */
@media screen and (max-width: 768px) {
    .nav-links {
        position: fixed;
        right: -100%;
        top: 70px;
        height: calc(100vh - 70px);
        background-color: #fff;
        flex-direction: column;
        width: 100%;
        text-align: center;
        transition: right 0.5s ease;
    }

    .nav-links.active {
        right: 0;
    }

    .nav-links li {
        margin: 2rem 0;
    }

    .burger {
        display: block;
    }

    .hero {
        padding: 6rem 1rem 3rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero h2 {
        font-size: 1.2rem;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .social-links {
        margin-bottom: 1rem;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .contact-form,
    .contact-info {
        padding: 1.5rem;
    }
}

/* Animation classes */
.nav-active {
    transform: translateX(0%);
}

@keyframes navLinkFade {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0px);
    }
}

/* Books section */
.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.book-card {
    background: #fff;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
    text-align: center;
}

.book-card:hover {
    transform: translateY(-5px);
}

.book-card h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.book-card p {
    color: #7f8c8d;
    margin-bottom: 1.5rem;
}

.series-cta {
    text-align: center;
    margin-top: 4rem;
    padding: 2rem;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border-radius: 10px;
}

.series-cta h2 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

.series-cta p {
    color: #7f8c8d;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Book Preview section */
.preview-content {
    max-width: 1000px;
    margin: 0 auto;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.benefit-card {
    background: #fff;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.3s ease;
}

.benefit-card:hover {
    transform: translateY(-5px);
}

.benefit-card i {
    font-size: 2.5rem;
    color: #3498db;
    margin-bottom: 1rem;
}

.benefit-card h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.benefit-card p {
    color: #7f8c8d;
    font-size: 0.95rem;
}

.early-access {
    text-align: center;
    margin-top: 4rem;
    padding: 2rem;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border-radius: 10px;
}

.early-access h2 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

.early-access p {
    color: #7f8c8d;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.early-access iframe {
    max-width: 100%;
    border-radius: 5px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

/* Contact section */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-top: 3rem;
}

.contact-form {
    background: #fff;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.contact-form h2 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

.contact-form p {
    color: #7f8c8d;
    margin-bottom: 2rem;
}

.contact-form iframe {
    width: 100%;
    border-radius: 5px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.contact-info {
    background: #fff;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.contact-info h2 {
    color: #2c3e50;
    margin-bottom: 2rem;
}

.contact-methods {
    display: grid;
    gap: 2rem;
}

.contact-method {
    text-align: center;
    padding: 1.5rem;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border-radius: 10px;
    transition: transform 0.3s ease;
}

.contact-method:hover {
    transform: translateY(-5px);
}

.contact-method i {
    font-size: 2.5rem;
    color: #3498db;
    margin-bottom: 1rem;
}

.contact-method h3 {
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.contact-method p {
    color: #7f8c8d;
    margin-bottom: 1rem;
}