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

:root {
    /* Color Palette - Dark theme with neon accents */
    --color-bg: #0a0a0f;
    --color-surface: #161622;
    --color-surface-light: #1e1e2e;
    --color-text: #e2e8f0;
    --color-text-secondary: #94a3b8;
    --color-accent: #00d9ff;
    --color-accent-dark: #0099cc;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-border: #2d3748;
    
    /* Typography - System fonts stack */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.7);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.8);
    --shadow-glow: 0 0 15px rgba(0, 217, 255, 0.3);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

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

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-accent-dark);
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--color-accent);
    color: var(--color-bg);
}

.btn-primary:hover {
    background-color: var(--color-accent-dark);
    color: var(--color-bg);
    box-shadow: var(--shadow-glow);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-accent);
    border: 2px solid var(--color-accent);
}

.btn-secondary:hover {
    background-color: rgba(0, 217, 255, 0.1);
    box-shadow: var(--shadow-glow);
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* ===== NAVIGATION ===== */
.navbar {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-icon {
    color: var(--color-accent);
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-links a {
    color: var(--color-text);
    font-weight: 500;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-accent);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--color-text);
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--spacing-xs);
}

/* ===== HERO SECTION ===== */
.hero {
    background: linear-gradient(135deg, rgba(10, 10, 15, 0.9) 0%, rgba(22, 22, 34, 0.9) 100%),
                url('../images/pattern.svg');
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(90deg, var(--color-accent), #00ffaa);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-lg);
}

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

/* ===== FEATURED BOOK ===== */
.featured-section {
    padding: var(--spacing-xl) 0;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background-color: var(--color-accent);
    margin: var(--spacing-xs) auto;
}

.featured-book {
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-xl);
    align-items: center;
    box-shadow: var(--shadow-lg);
}

.featured-book-cover {
    flex-shrink: 0;
    width: 300px;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

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

.featured-book-info h3 {
    font-size: 2rem;
    margin-bottom: var(--spacing-xs);
}

.featured-book-subtitle {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.featured-book-description {
    margin-bottom: var(--spacing-md);
}

.featured-book-price {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
}

.featured-book-tags {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-md);
}

.tag {
    background-color: var(--color-surface-light);
    color: var(--color-text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
}

.featured-book-buttons {
    display: flex;
    gap: var(--spacing-md);
}

/* ===== BOOKS GRID ===== */
.books-section {
    padding: var(--spacing-xl) 0;
}

.section-header {
    margin-bottom: var(--spacing-lg);
}

.filter-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.search-box {
    max-width: 400px;
}

.search-box input {
    width: 100%;
    padding: 0.75rem 1rem;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-size: 1rem;
}

.search-box input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: var(--shadow-glow);
}

.tag-filters {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.tag-filter {
    background-color: var(--color-surface);
    color: var(--color-text-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    border: 1px solid var(--color-border);
    transition: all 0.2s ease;
}

.tag-filter:hover,
.tag-filter.active {
    background-color: var(--color-accent);
    color: var(--color-bg);
    border-color: var(--color-accent);
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.book-card {
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: var(--shadow-md);
}

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

.book-card-cover {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.book-card-content {
    padding: var(--spacing-md);
}

.book-card-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
}

.book-card-description {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-card-price {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
}

.book-card-tags {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-md);
}

.book-card-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* ===== TESTIMONIALS ===== */
.testimonials-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-surface);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.testimonial-card {
    background-color: var(--color-surface-light);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--color-accent);
}

.testimonial-text {
    font-style: italic;
    margin-bottom: var(--spacing-sm);
}

.testimonial-author {
    font-weight: 600;
    color: var(--color-text-secondary);
}

/* ===== FAQ ===== */
.faq-section {
    padding: var(--spacing-xl) 0;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.faq-item {
    background-color: var(--color-surface);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
}

.faq-item h3 {
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

/* ===== NEWSLETTER ===== */
.newsletter-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-surface);
}

.newsletter-box {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
    padding: var(--spacing-lg);
    background-color: var(--color-surface-light);
    border-radius: var(--radius-lg);
}

.newsletter-form {
    display: flex;
    gap: var(--spacing-sm);
    margin: var(--spacing-md) 0;
    flex-wrap: wrap;
    justify-content: center;
}

.newsletter-form input {
    flex: 1;
    min-width: 250px;
    padding: 0.75rem 1rem;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
}

.newsletter-note {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

/* ===== FOOTER ===== */
.footer {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.footer-column h4 {
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
}

.footer-column a {
    display: block;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.footer-column a:hover {
    color: var(--color-accent);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

/* ===== BOOK DETAIL PAGE ===== */
.book-detail-container {
    padding: var(--spacing-xl) 0;
}

.book-detail {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.book-detail-cover {
    width: 100%;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

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

.book-detail-meta {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    margin: var(--spacing-md) 0;
}

.meta-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.meta-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.meta-value {
    font-weight: 600;
}

.book-detail-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

/* ===== ABOUT PAGE ===== */
.about-content {
    padding: var(--spacing-xl) 0;
}

.about-section {
    margin-bottom: var(--spacing-xl);
}

.creator-info {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.philosophy-item {
    background-color: var(--color-surface);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
}

.feature-list {
    list-style: none;
    padding-left: 0;
}

.feature-list li {
    padding: var(--spacing-xs) 0;
    padding-left: 1.5rem;
    position: relative;
}

.feature-list li::before {
    content: '✓';
    color: var(--color-accent);
    position: absolute;
    left: 0;
}

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

/* ===== CONTACT PAGE ===== */
.contact-content {
    padding: var(--spacing-xl) 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin: var(--spacing-xl) 0;
}

.contact-method {
    background-color: var(--color-surface);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
}

.contact-link {
    font-size: 1.125rem;
    font-weight: 600;
    display: inline-block;
    margin: var(--spacing-xs) 0;
}

.response-time {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    font-style: italic;
}

.contact-form {
    background-color: var(--color-surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--color-surface-light);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-family: var(--font-primary);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: var(--shadow-glow);
}

.form-note {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-top: var(--spacing-md);
}

.faq-preview {
    background-color: var(--color-surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-xl);
}

/* ===== LEGAL PAGE ===== */
.legal-content {
    padding: var(--spacing-xl) 0;
}

.legal-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.legal-tab {
    background-color: var(--color-surface);
    color: var(--color-text);
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
}

.legal-tab:hover,
.legal-tab.active {
    background-color: var(--color-accent);
    color: var(--color-bg);
}

.legal-section {
    display: none;
    background-color: var(--color-surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
}

.legal-section.active {
    display: block;
}

.legal-section h3 {
    margin-top: var(--spacing-lg);
    color: var(--color-accent);
}

.legal-section ul {
    padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.legal-section li {
    margin-bottom: var(--spacing-xs);
}

/* ===== THANK YOU PAGE ===== */
.thank-you-content {
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.thank-you-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
}

.thank-you-card {
    background-color: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin: var(--spacing-xl) 0;
    text-align: left;
}

.steps {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.step {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
}

.step-number {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    background-color: var(--color-accent);
    color: var(--color-bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
}

.step-content h3 {
    margin-bottom: var(--spacing-xs);
}

.important-notes {
    background-color: var(--color-surface-light);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-lg);
}

.next-steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

.next-step-card {
    background-color: var(--color-surface);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    text-align: center;
}

.support-reminder {
    background-color: var(--color-surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-xl);
    text-align: left;
}

/* ===== UTILITY CLASSES ===== */
.loading {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-text-secondary);
}

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

.page-subtitle {
    text-align: center;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

/* ===== MOBILE RESPONSIVENESS ===== */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.75rem;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--color-surface);
        flex-direction: column;
        padding: var(--spacing-md);
        border-top: 1px solid var(--color-border);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .featured-book {
        flex-direction: column;
        text-align: center;
    }
    
    .featured-book-cover {
        width: 100%;
        max-width: 300px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .book-detail {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .creator-info {
        grid-template-columns: 1fr;
    }
    
    .book-card-actions {
        flex-direction: column;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .featured-book-buttons {
        flex-direction: column;
    }
    
    .book-detail-buttons {
        flex-direction: column;
    }
    
    .step {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .books-grid {
        grid-template-columns: 1fr;
    }
    
    .faq-grid,
    .testimonials-grid,
    .philosophy-grid,
    .next-steps-grid {
        grid-template-columns: 1fr;
    }
}