/* ===================================
   VERDANT PRESS - MAIN STYLESHEET
   A clean, professional design for a digital publisher
   =================================== */

/* CSS VARIABLES - Easy to customize colors and fonts */
:root {
    /* Color Palette */
    --color-primary: #1a3a52;        /* Deep navy blue */
    --color-secondary: #d4a574;      /* Warm gold accent */
    --color-accent: #2c5f7f;         /* Medium blue */
    --color-background: #faf8f5;     /* Warm off-white */
    --color-text: #2d3436;           /* Dark gray for text */
    --color-text-light: #636e72;     /* Light gray for secondary text */
    --color-white: #ffffff;
    
    /* Typography */
    --font-heading: 'Crimson Text', serif;    /* Elegant serif for headings */
    --font-body: 'Work Sans', sans-serif;     /* Clean sans-serif for body */
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Other */
    --border-radius: 8px;
    --transition: all 0.3s ease;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
}

/* RESET & BASE STYLES */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* TYPOGRAPHY */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--color-secondary);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* CONTAINER */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* HEADER & NAVIGATION */
.header {
    background-color: var(--color-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    max-width: 1200px;
    margin: 0 auto;
}

.logo a {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.5px;
}

.logo a:hover {
    color: var(--color-secondary);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-menu a {
    color: var(--color-text);
    font-weight: 500;
    padding: var(--spacing-xs) 0;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-secondary);
    transition: var(--transition);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

.nav-menu a.active {
    color: var(--color-primary);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-toggle span {
    width: 25px;
    height: 2px;
    background-color: var(--color-primary);
    margin: 3px 0;
    transition: var(--transition);
}

/* HERO SECTION */
.hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    color: var(--color-white);
    padding: var(--spacing-xl) var(--spacing-md);
    text-align: center;
}

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

.hero-title {
    font-size: 3.5rem;
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.95;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

/* BUTTONS */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--color-secondary);
    color: var(--color-white);
}

.btn-primary:hover {
    background-color: #c49560;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-white);
    border-color: var(--color-white);
}

.btn-secondary:hover {
    background-color: var(--color-white);
    color: var(--color-primary);
}

/* SECTIONS */
section {
    padding: var(--spacing-lg) 0;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    font-size: 2.5rem;
}

/* PAGE HEADER */
.page-header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    color: var(--color-white);
    padding: var(--spacing-lg) var(--spacing-md);
    text-align: center;
}

.page-header h1 {
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

.page-header p {
    font-size: 1.125rem;
    opacity: 0.95;
}

/* BOOKS GRID */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.book-card {
    background-color: var(--color-white);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.book-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.book-cover {
    position: relative;
    overflow: hidden;
    aspect-ratio: 2/3;
}

.book-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

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

.book-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(26, 58, 82, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

.book-card:hover .book-overlay {
    opacity: 1;
}

.overlay-btn {
    background-color: var(--color-secondary);
    color: var(--color-white);
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 500;
}

.overlay-btn:hover {
    background-color: #c49560;
    transform: scale(1.05);
}

.book-info {
    padding: var(--spacing-sm);
}

.book-genre {
    display: inline-block;
    background-color: var(--color-accent);
    color: var(--color-white);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-xs);
}

.book-title {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
    color: var(--color-primary);
}

.book-author {
    color: var(--color-text-light);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-xs);
}

.book-description {
    font-size: 0.875rem;
    color: var(--color-text-light);
    line-height: 1.5;
}

/* FILTER BUTTONS */
.filter-section {
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.filter-label {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-body);
}

.filter-container {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.filter-btn {
    background-color: var(--color-white);
    color: var(--color-text);
    border: 2px solid var(--color-primary);
    padding: 0.625rem 1.25rem;
    border-radius: 25px;
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
    font-family: var(--font-body);
    font-size: 0.875rem;
}

.filter-btn:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
}

.filter-btn.active {
    background-color: var(--color-primary);
    color: var(--color-white);
}

/* AUTHORS SECTION */
.authors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.author-card {
    background-color: var(--color-white);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.author-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.author-image {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
    border: 4px solid var(--color-secondary);
}

.author-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.author-info h3 {
    margin-bottom: 0.25rem;
}

.author-genre {
    color: var(--color-secondary);
    font-weight: 500;
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
    display: block;
}

.author-info p {
    color: var(--color-text-light);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
}

.author-books {
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid #e0e0e0;
    font-size: 0.875rem;
}

.author-books strong {
    color: var(--color-primary);
}

/* ABOUT PAGE */
.about-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
}

.lead-text {
    font-size: 1.125rem;
    color: var(--color-text-light);
    line-height: 1.8;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.about-card {
    background-color: var(--color-white);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

.about-card h3 {
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
}

.about-values {
    text-align: center;
    margin: var(--spacing-xl) 0;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.value-item {
    padding: var(--spacing-md);
}

.value-item h4 {
    color: var(--color-secondary);
    margin-bottom: var(--spacing-xs);
}

.value-item p {
    color: var(--color-text-light);
    font-size: 0.875rem;
}

.about-cta {
    text-align: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    color: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    margin-top: var(--spacing-lg);
}

.about-cta h2 {
    color: var(--color-white);
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-top: var(--spacing-md);
    flex-wrap: wrap;
}

/* CONTACT PAGE */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.contact-form-container {
    background-color: var(--color-white);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--color-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-secondary);
    box-shadow: 0 0 0 3px rgba(212, 165, 116, 0.1);
}

.form-success {
    background-color: #d4edda;
    color: #155724;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    margin-top: var(--spacing-sm);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.info-block h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.info-block a {
    color: var(--color-accent);
}

.info-note {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-top: 0.25rem;
}

.social-links-vertical {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.social-links-vertical a {
    color: var(--color-accent);
}

.faq-section {
    margin-top: var(--spacing-xl);
}

.faq-section h2 {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.faq-item {
    background-color: var(--color-white);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

.faq-item h4 {
    color: var(--color-secondary);
    margin-bottom: var(--spacing-xs);
}

.faq-item p {
    color: var(--color-text-light);
    font-size: 0.875rem;
}

/* CTA SECTION */
.cta-section {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    color: var(--color-white);
    text-align: center;
    padding: var(--spacing-lg) var(--spacing-md);
}

.cta-section h2 {
    color: var(--color-white);
}

.cta-section p {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
}

.authors-cta {
    text-align: center;
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background-color: var(--color-white);
    border-radius: var(--border-radius);
}

/* FOOTER */
.footer {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-lg) 0 var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.footer-column h3,
.footer-column h4 {
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
}

.footer-column ul {
    list-style: none;
}

.footer-column ul li {
    margin-bottom: 0.5rem;
}

.footer-column a {
    color: var(--color-white);
    opacity: 0.9;
}

.footer-column a:hover {
    opacity: 1;
    color: var(--color-secondary);
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    opacity: 0.8;
    font-size: 0.875rem;
}

/* RESPONSIVE DESIGN */
@media (max-width: 768px) {
    /* Typography adjustments */
    h1 { font-size: 2.25rem; }
    h2 { font-size: 1.875rem; }
    .hero-title { font-size: 2.5rem; }
    
    /* Navigation */
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--color-white);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-lg);
        padding: var(--spacing-md) 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    /* Grid adjustments */
    .books-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: var(--spacing-sm);
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .authors-grid {
        grid-template-columns: 1fr;
    }
    
    /* Spacing */
    section {
        padding: var(--spacing-md) 0;
    }
    
    .hero {
        padding: var(--spacing-lg) var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .books-grid {
        grid-template-columns: 1fr;
    }
    
    .filter-container {
        gap: 0.5rem;
    }
    
    .filter-btn {
        padding: 0.5rem 1rem;
        font-size: 0.8rem;
    }
}

/* UTILITY CLASSES */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }

/* ===================================
   BOOK DETAIL PAGES
   =================================== */

.book-detail-section {
    padding: var(--spacing-md) 0 var(--spacing-lg);
}

.back-link {
    margin-bottom: var(--spacing-md);
}

.back-link a {
    color: var(--color-accent);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.back-link a:hover {
    color: var(--color-secondary);
    transform: translateX(-4px);
}

/* Book Detail Grid Layout */
.book-detail-grid {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

/* Sidebar with Cover and Purchase Options */
.book-detail-sidebar {
    position: sticky;
    top: 100px;
    height: fit-content;
}

.book-detail-cover {
    margin-bottom: var(--spacing-md);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.book-detail-cover img {
    width: 100%;
    height: auto;
    display: block;
}

/* Purchase Options */
.purchase-options {
    background-color: var(--color-white);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

.purchase-options h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
    border-bottom: 2px solid var(--color-secondary);
    padding-bottom: var(--spacing-xs);
}

.purchase-format {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid #e0e0e0;
}

.purchase-format:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.purchase-format h4 {
    font-size: 1rem;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
}

.purchase-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: var(--spacing-sm);
}

.purchase-btn {
    display: block;
    padding: 0.625rem 1rem;
    background-color: var(--color-accent);
    color: var(--color-white);
    text-align: center;
    border-radius: var(--border-radius);
    font-weight: 500;
    font-size: 0.875rem;
    transition: var(--transition);
}

.purchase-btn:hover {
    background-color: var(--color-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.isbn,
.pub-date {
    font-size: 0.8rem;
    color: var(--color-text-light);
    margin-bottom: 0.25rem;
}

/* Book Content Area */
.book-detail-content {
    max-width: 800px;
}

.book-detail-title {
    font-size: 3rem;
    margin-bottom: var(--spacing-xs);
    line-height: 1.2;
}

.book-detail-author {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.book-detail-author a {
    color: var(--color-accent);
    font-weight: 500;
}

.book-detail-author a:hover {
    color: var(--color-secondary);
}

/* Book Description */
.book-description {
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.book-description .lead-paragraph {
    font-size: 1.125rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.book-description p {
    margin-bottom: var(--spacing-sm);
}

/* Reader Reviews */
.reader-reviews {
    background-color: var(--color-white);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    margin-top: var(--spacing-lg);
}

.reader-reviews h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

.review {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid #e0e0e0;
    margin-bottom: var(--spacing-sm);
}

.review:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.review-stars {
    color: var(--color-secondary);
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.review p {
    line-height: 1.7;
    margin-bottom: 0.5rem;
}

.reviewer {
    font-size: 0.875rem;
    color: var(--color-text-light);
    font-style: italic;
}

/* Related Books Section */
.related-books-section {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 2px solid #e0e0e0;
}

.related-books-section h2 {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

/* Responsive Design for Book Detail Pages */
@media (max-width: 968px) {
    .book-detail-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .book-detail-sidebar {
        position: static;
        display: grid;
        grid-template-columns: 250px 1fr;
        gap: var(--spacing-md);
    }
    
    .book-detail-title {
        font-size: 2.25rem;
    }
}

@media (max-width: 640px) {
    .book-detail-sidebar {
        grid-template-columns: 1fr;
    }
    
    .book-detail-title {
        font-size: 1.875rem;
    }
    
    .purchase-links {
        flex-direction: column;
    }
}