/* ============================================
   CSS Variables & Reset
   ============================================ */
:root {
    /* Colors - Dark Theme (Default) */
    --color-bg-primary: #0a0e17;
    --color-bg-secondary: #111827;
    --color-bg-tertiary: #1f2937;
    --color-text-primary: #f8fafc;
    --color-text-secondary: #cbd5e1;
    --color-text-muted: #94a3b8;
    --color-accent: #f59e0b;
    --color-accent-hover: #d97706;
    --color-border: #374151;
    --color-border-light: #4b5563;

    /* Typography */
    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'SF Mono', Consolas, 'Liberation Mono', Menlo, monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 2rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    --space-3xl: 8rem;

    /* Layout */
    --container-max: 1200px;
    --nav-height: 70px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
}

/* Light Theme */
body.light-mode {
    --color-bg-primary: #f8fafc;
    --color-bg-secondary: #ffffff;
    --color-bg-tertiary: #f1f5f9;
    --color-text-primary: #0f172a;
    --color-text-secondary: #334155;
    --color-text-muted: #64748b;
    --color-border: #e2e8f0;
    --color-border-light: #cbd5e1;
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

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

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-text-primary);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

p {
    margin-bottom: var(--space-lg);
    color: var(--color-text-secondary);
}

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

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

/* ============================================
   Layout
   ============================================ */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* ============================================
   Navigation
   ============================================ */
.site-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    height: var(--nav-height);
    backdrop-filter: blur(10px);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text-primary);
    transition: color var(--transition-fast);
}

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

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--space-lg);
}

.nav-links a {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text-primary);
    transition: var(--transition-base);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: var(--nav-height);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(245, 158, 11, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(245, 158, 11, 0.05) 0%, transparent 50%),
        linear-gradient(180deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
}

.hero-content {
    position: relative;
    text-align: center;
    max-width: 800px;
    padding: var(--space-xl) var(--space-lg);
    animation: fadeIn 1s ease-out;
}

.hero-title {
    margin-bottom: var(--space-lg);
}

.hero-title-line {
    display: block;
    margin-bottom: var(--space-sm);
}

.hero-title-subtitle {
    display: block;
    font-family: var(--font-body);
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--color-text-muted);
    letter-spacing: 2px;
    text-transform: uppercase;
}

.hero-tagline {
    font-size: clamp(1.1rem, 2vw, 1.35rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
    font-style: italic;
    font-family: var(--font-display);
}

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

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md) var(--space-xl);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-bg-primary);
    background-color: var(--color-accent);
    border: 2px solid var(--color-accent);
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

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

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

.btn-secondary:hover {
    background-color: var(--color-bg-tertiary);
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.btn-small {
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.9rem;
}

/* ============================================
   Sections
   ============================================ */
.section {
    padding: var(--space-2xl) 0;
    border-bottom: 1px solid var(--color-border);
}

.section-label {
    display: block;
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: var(--space-sm);
}

.section-title {
    margin-bottom: var(--space-lg);
}

.section-lead {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
    max-width: 700px;
}

/* ============================================
   Book Teaser Section
   ============================================ */
.teaser-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    align-items: start;
}

@media (min-width: 768px) {
    .teaser-grid {
        grid-template-columns: 300px 1fr;
    }
}

.teaser-cover {
    display: flex;
    justify-content: center;
}

.book-cover-placeholder {
    width: 200px;
    height: 300px;
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-base);
}

.book-cover-placeholder:hover {
    transform: translateY(-8px);
}

.book-cover-large {
    width: 250px;
    height: 375px;
    margin: 0 auto;
    box-shadow: var(--shadow-lg);
}

.teaser-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.teaser-text {
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.teaser-genre {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    margin: var(--space-sm) 0;
}

.genre-tag {
    padding: var(--space-xs) var(--space-md);
    background-color: var(--color-bg-tertiary);
    color: var(--color-text-muted);
    font-size: 0.85rem;
    border-radius: 20px;
    border: 1px solid var(--color-border);
}

/* ============================================
   About Preview Section
   ============================================ */
.about-preview-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    align-items: center;
}

@media (min-width: 768px) {
    .about-preview-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.about-image {
    display: flex;
    justify-content: center;
}

.author-photo-placeholder {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    box-shadow: var(--shadow-md);
}

.about-text {
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.about-actions {
    margin-top: var(--space-md);
}

/* ============================================
   Email Signup
   ============================================ */
.section-notify {
    background: linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg-tertiary) 100%);
}

.notify-content {
    max-width: 600px;
    text-align: center;
    margin: 0 auto;
}

.notify-title {
    margin-bottom: var(--space-md);
}

.notify-text {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
}

.email-form {
    display: flex;
    gap: var(--space-sm);
    margin: var(--space-lg) 0;
    flex-wrap: wrap;
}

.email-input {
    flex: 1;
    min-width: 200px;
    padding: var(--space-md);
    font-size: 1rem;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    border: 2px solid var(--color-border);
    border-radius: 4px;
    transition: border-color var(--transition-fast);
}

.email-input:focus {
    outline: none;
    border-color: var(--color-accent);
}

.email-submit {
    padding: var(--space-md) var(--space-xl);
}

.notify-small {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: var(--space-md);
}

/* ============================================
   Journal Section
   ============================================ */
.journal-preview-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.journal-preview-item {
    padding: var(--space-lg);
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    transition: border-color var(--transition-fast);
}

.journal-preview-item:hover {
    border-color: var(--color-border-light);
}

.journal-date {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
}

.journal-title {
    margin-bottom: var(--space-sm);
}

.journal-title a {
    color: var(--color-text-primary);
    transition: color var(--transition-fast);
}

.journal-title a:hover {
    color: var(--color-accent);
}

.journal-excerpt {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-sm);
}

.journal-actions {
    text-align: center;
    margin-top: var(--space-lg);
}

/* ============================================
   Link Arrow
   ============================================ */
.link-arrow {
    display: inline-flex;
    align-items: center;
    font-weight: 500;
    color: var(--color-accent);
    transition: transform var(--transition-fast);
}

.link-arrow:hover {
    transform: translateX(4px);
}

/* ============================================
   Page Hero
   ============================================ */
.page-hero {
    padding: calc(var(--nav-height) + var(--space-2xl)) 0 var(--space-xl);
    text-align: center;
    position: relative;
}

.page-hero .hero-background {
    background: 
        radial-gradient(ellipse at 50% 0%, rgba(245, 158, 11, 0.08) 0%, transparent 50%),
        linear-gradient(180deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
}

.page-title {
    margin-bottom: var(--space-sm);
}

.page-subtitle {
    font-family: var(--font-body);
    font-size: 1.1rem;
    color: var(--color-text-muted);
    letter-spacing: 1px;
}

/* ============================================
   About Page
   ============================================ */
.section-about {
    padding: var(--space-xl) 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
}

@media (min-width: 900px) {
    .about-grid {
        grid-template-columns: 2fr 1fr;
    }
}

.about-main-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.about-block h2 {
    margin-bottom: var(--space-md);
}

.about-block p {
    line-height: 1.8;
}

/* Sidebar */
.about-sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.sidebar-card {
    padding: var(--space-lg);
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 8px;
}

.sidebar-card h3 {
    margin-bottom: var(--space-md);
    font-size: 1.25rem;
}

.facts-list {
    list-style: none;
}

.facts-list li {
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    font-size: 0.95rem;
}

.facts-list li:last-child {
    border-bottom: none;
}

.fact-label {
    color: var(--color-text-muted);
}

.sidebar-text {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
    font-size: 0.95rem;
}

.social-links {
    margin-top: var(--space-lg);
    display: flex;
    gap: var(--space-md);
}

.social-link {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

.social-link:hover {
    color: var(--color-accent);
}

/* ============================================
   Book Page
   ============================================ */
.book-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    align-items: start;
}

@media (min-width: 768px) {
    .book-grid {
        grid-template-columns: 300px 1fr;
    }
}

.book-cover-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
}

.book-status {
    display: flex;
    justify-content: center;
}

.status-badge {
    padding: var(--space-sm) var(--space-lg);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.status-coming-soon {
    background-color: rgba(245, 158, 11, 0.1);
    color: var(--color-accent);
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.book-genre {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    margin-bottom: var(--space-lg);
}

.book-section {
    margin: var(--space-xl) 0;
}

.book-section h2 {
    margin-bottom: var(--space-md);
}

.book-description {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-md);
}

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

.themes-list li {
    padding: var(--space-sm) 0;
    padding-left: var(--space-lg);
    position: relative;
    color: var(--color-text-secondary);
}

.themes-list li::before {
    content: "—";
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

/* Availability */
.section-availability {
    background-color: var(--color-bg-secondary);
}

.availability-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-xl);
}

@media (min-width: 600px) {
    .availability-grid {
        grid-template-columns: repeat(5, 1fr);
    }
}

.availability-item {
    padding: var(--space-lg);
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    text-align: center;
    transition: border-color var(--transition-fast);
}

.availability-item:hover {
    border-color: var(--color-border-light);
}

.availability-name {
    display: block;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.availability-status {
    display: block;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* Series */
.series-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

@media (min-width: 600px) {
    .series-list {
        grid-template-columns: repeat(3, 1fr);
    }
}

.series-item {
    padding: var(--space-lg);
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    transition: all var(--transition-base);
}

.series-item-current {
    border-color: var(--color-accent);
}

.series-item-future {
    opacity: 0.7;
}

.series-number {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--space-sm);
}

.series-title {
    margin-bottom: var(--space-sm);
    font-size: 1.25rem;
}

.series-status {
    display: block;
    font-size: 0.85rem;
    color: var(--color-accent);
}

.section-notify-book {
    background: var(--color-bg-primary);
}

/* ============================================
   Journal Page
   ============================================ */
.journal-intro {
    max-width: 800px;
    margin-bottom: var(--space-xl);
}

.journal-intro p {
    font-size: 1.1rem;
    line-height: 1.8;
}

.journal-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.journal-entry {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-border);
}

@media (min-width: 600px) {
    .journal-entry {
        grid-template-columns: auto 1fr;
    }
}

.journal-entry-date {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-md);
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    min-width: 100px;
}

.date-day {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 600;
    color: var(--color-accent);
    line-height: 1;
}

.date-month {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.date-year {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.journal-entry-content h2 {
    margin-bottom: var(--space-sm);
}

.journal-entry-excerpt {
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-sm);
}

.journal-entry-meta {
    display: flex;
    gap: var(--space-sm);
    margin: var(--space-md) 0;
}

.meta-tag {
    padding: var(--space-xs) var(--space-md);
    background-color: var(--color-bg-tertiary);
    color: var(--color-text-muted);
    font-size: 0.75rem;
    border-radius: 20px;
    border: 1px solid var(--color-border);
}

.journal-pagination {
    margin-top: var(--space-xl);
    text-align: center;
}

.pagination-info {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* ============================================
   Blog Post
   ============================================ */
.blog-post {
    min-height: 100vh;
}

.blog-header {
    padding: calc(var(--nav-height) + var(--space-2xl)) 0 var(--space-xl);
    text-align: center;
    position: relative;
}

.blog-header .hero-background {
    background: 
        radial-gradient(ellipse at 50% 0%, rgba(245, 158, 11, 0.08) 0%, transparent 50%),
        linear-gradient(180deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
}

.blog-breadcrumb {
    margin-bottom: var(--space-lg);
}

.blog-breadcrumb a {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

.blog-breadcrumb a:hover {
    color: var(--color-accent);
}

.blog-date {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.blog-title {
    margin-bottom: var(--space-md);
}

.blog-meta {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-top: var(--space-lg);
}

.blog-content {
    padding: var(--space-xl) 0;
}

.blog-body {
    max-width: 720px;
    margin: 0 auto;
}

.blog-body h2 {
    margin: var(--space-xl) 0 var(--space-md);
}

.blog-body p {
    font-size: 1.05rem;
    line-height: 1.9;
}

.blog-footer {
    max-width: 720px;
    margin: var(--space-xl) auto 0;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
}

.blog-footer-content {
    text-align: center;
    padding: var(--space-xl) 0;
}

.blog-footer-text {
    font-size: 1rem;
    margin-bottom: var(--space-lg);
}

.blog-navigation {
    display: flex;
    justify-content: space-between;
    gap: var(--space-lg);
    padding-top: var(--space-lg);
}

@media (max-width: 600px) {
    .blog-navigation {
        flex-direction: column;
    }
}

.nav-link {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-accent);
}

.nav-next {
    text-align: right;
    margin-left: auto;
}

/* ============================================
   CTA Section
   ============================================ */
.section-cta {
    background: linear-gradient(180deg, var(--color-bg-tertiary) 0%, var(--color-bg-secondary) 100%);
    text-align: center;
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
}

.cta-content h2 {
    margin-bottom: var(--space-md);
}

.cta-content p {
    font-size: 1.1rem;
    margin-bottom: var(--space-lg);
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--space-xl) 0 var(--space-lg);
}

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

@media (min-width: 768px) {
    .footer-content {
        grid-template-columns: 2fr 1fr 1fr;
    }
}

.footer-brand h3 {
    margin-bottom: var(--space-sm);
}

.footer-tagline {
    color: var(--color-text-muted);
    font-style: italic;
    font-family: var(--font-display);
}

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

.footer-nav li {
    padding: var(--space-xs) 0;
}

.footer-nav a {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    transition: color var(--transition-fast);
}

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

.footer-social {
    display: flex;
    gap: var(--space-md);
    justify-content: flex-start;
}

.footer-bottom {
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-bottom p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background-color: var(--color-bg-primary);
        flex-direction: column;
        padding: var(--space-lg);
        gap: var(--space-md);
        border-bottom: 1px solid var(--color-border);
    }

    .nav-links.active {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .email-form {
        flex-direction: column;
    }

    .email-submit {
        width: 100%;
    }

    .book-genre {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    :root {
        --space-lg: 1.5rem;
        --space-xl: 2.5rem;
        --space-2xl: 4rem;
    }

    .hero-cta {
        flex-direction: column;
        width: 100%;
    }

    .hero-cta .btn {
        width: 100%;
    }
}