/* ============================================
   THE ART OF BECOMING - Ebook Landing Page
   Design System: Editorial/Magazine
   Palette: Parchment & Ink
   ============================================ */

/* CSS Variables */
:root {
    /* Colors - Parchment & Ink Palette */
    --color-paper: #F4ECD8;
    --color-parchment: #D4C5A9;
    --color-parchment-dark: #B8A88A;
    --color-ink: #2C2C2C;
    --color-ink-light: #4A4A4A;
    --color-accent: #8B4513;
    --color-accent-light: #A0522D;
    
    /* Typography */
    --font-display: 'EB Garamond', Georgia, serif;
    --font-body: 'Atkinson Hyperlegible', -apple-system, sans-serif;
    
    /* Font Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;
    --text-7xl: 4.5rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;
    
    /* Layout */
    --container-max: 1200px;
    --container-narrow: 800px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(44, 44, 44, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(44, 44, 44, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(44, 44, 44, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(44, 44, 44, 0.1);
}

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

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

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

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

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

/* Typography */
h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 {
    font-size: var(--text-6xl);
}

h2 {
    font-size: var(--text-4xl);
}

h3 {
    font-size: var(--text-2xl);
}

h4 {
    font-size: var(--text-xl);
}

p {
    margin-bottom: var(--space-4);
}

.lead {
    font-size: var(--text-xl);
    line-height: 1.6;
    color: var(--color-ink-light);
}

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(244, 236, 216, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-parchment);
    transition: var(--transition-base);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--space-4) var(--space-6);
}

.nav-logo {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--color-ink);
    letter-spacing: -0.02em;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav-menu a {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-ink-light);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-menu a:hover {
    color: var(--color-ink);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-accent);
    transition: width var(--transition-base);
}

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

.nav-cta {
    background: var(--color-ink);
    color: var(--color-paper) !important;
    padding: var(--space-2) var(--space-4);
    border-radius: 2px;
}

.nav-cta::after {
    display: none !important;
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-6);
    font-family: var(--font-body);
    font-size: var(--text-base);
    font-weight: 600;
    border-radius: 2px;
    cursor: pointer;
    transition: all var(--transition-base);
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--color-ink);
    color: var(--color-paper);
    border-color: var(--color-ink);
}

.btn-primary:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background: var(--color-ink);
    color: var(--color-paper);
}

.btn-large {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-lg);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: calc(var(--space-24) + 60px) 0 var(--space-16);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(139, 69, 19, 0.05) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(212, 197, 169, 0.3) 0%, transparent 50%);
    pointer-events: none;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-6);
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 600px;
}

.hero-tagline {
    font-family: var(--font-display);
    font-size: var(--text-sm);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-accent);
    margin-bottom: var(--space-4);
}

.hero-title {
    font-size: clamp(var(--text-5xl), 8vw, var(--text-7xl));
    font-weight: 700;
    line-height: 1;
    margin-bottom: var(--space-6);
    color: var(--color-ink);
}

.hero-subtitle {
    font-size: var(--text-xl);
    color: var(--color-ink-light);
    margin-bottom: var(--space-8);
    line-height: 1.6;
}

.hero-cta-group {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-12);
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: var(--space-10);
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-parchment);
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-family: var(--font-display);
    font-size: var(--text-3xl);
    font-weight: 700;
    color: var(--color-ink);
}

.stat-label {
    font-size: var(--text-sm);
    color: var(--color-ink-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Book Showcase */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.book-showcase {
    position: relative;
    width: 280px;
    height: 400px;
    perspective: 1000px;
}

.book-spine {
    position: absolute;
    left: 0;
    top: 0;
    width: 40px;
    height: 100%;
    background: linear-gradient(90deg, #1a1a1a 0%, #2C2C2C 50%, #1a1a1a 100%);
    transform: rotateY(-30deg);
    transform-origin: left center;
    border-radius: 2px 0 0 2px;
}

.book-cover {
    position: absolute;
    left: 40px;
    top: 0;
    width: 240px;
    height: 100%;
    background: linear-gradient(135deg, #2C2C2C 0%, #1a1a1a 100%);
    border-radius: 0 4px 4px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 
        10px 10px 30px rgba(0, 0, 0, 0.3),
        inset 0 0 60px rgba(139, 69, 19, 0.1);
}

.book-cover-content {
    text-align: center;
    color: var(--color-paper);
    padding: var(--space-6);
}

.book-subtitle {
    font-family: var(--font-display);
    font-size: var(--text-sm);
    font-style: italic;
    opacity: 0.8;
    display: block;
    margin-bottom: var(--space-2);
}

.book-title {
    font-family: var(--font-display);
    font-size: var(--text-3xl);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--space-4);
}

.book-author {
    font-size: var(--text-xs);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    opacity: 0.7;
}

.book-shadow {
    position: absolute;
    bottom: -20px;
    left: 20px;
    right: -20px;
    height: 40px;
    background: radial-gradient(ellipse at center, rgba(0,0,0,0.2) 0%, transparent 70%);
    filter: blur(10px);
}

.floating-elements {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.float-element {
    position: absolute;
    font-size: var(--text-2xl);
    color: var(--color-accent);
    opacity: 0.3;
    animation: float 6s ease-in-out infinite;
}

.float-1 {
    top: 10%;
    right: 10%;
    animation-delay: 0s;
}

.float-2 {
    bottom: 20%;
    left: 5%;
    animation-delay: 2s;
}

.float-3 {
    top: 50%;
    right: 5%;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(10deg); }
}

.hero-scroll {
    position: absolute;
    bottom: var(--space-8);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    color: var(--color-ink-light);
    font-size: var(--text-xs);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-10px); }
}

/* Section Styles */
.section {
    padding: var(--space-24) 0;
}

.section-header {
    margin-bottom: var(--space-16);
    max-width: 600px;
}

.section-header.centered {
    text-align: center;
    margin-left: auto;
    margin-right: auto;
}

.section-number {
    font-family: var(--font-display);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-accent);
    display: block;
    margin-bottom: var(--space-2);
    letter-spacing: 0.1em;
}

.section-title {
    font-size: clamp(var(--text-3xl), 5vw, var(--text-5xl));
    margin-bottom: var(--space-4);
}

.section-subtitle {
    font-size: var(--text-lg);
    color: var(--color-ink-light);
}

/* Problem Section */
.problem {
    background: var(--color-parchment);
    position: relative;
}

.problem::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-parchment-dark), transparent);
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
}

.problem-card {
    background: var(--color-paper);
    padding: var(--space-8);
    border-radius: 2px;
    border: 1px solid var(--color-parchment);
    transition: all var(--transition-base);
}

.problem-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-accent);
}

.problem-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-parchment);
    border-radius: 50%;
    margin-bottom: var(--space-6);
    color: var(--color-accent);
}

.problem-card h3 {
    font-size: var(--text-xl);
    margin-bottom: var(--space-4);
}

.problem-card p {
    font-size: var(--text-base);
    color: var(--color-ink-light);
    margin: 0;
}

/* Solution Section */
.solution-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--space-16);
    align-items: center;
}

.solution-features {
    margin-top: var(--space-10);
    display: flex;
    flex-direction: column;
    gap: var(--space-8);
}

.feature {
    display: flex;
    gap: var(--space-6);
    align-items: flex-start;
}

.feature-number {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-accent);
    opacity: 0.5;
    line-height: 1;
    flex-shrink: 0;
    min-width: 40px;
}

.feature-content h4 {
    font-size: var(--text-lg);
    margin-bottom: var(--space-2);
}

.feature-content p {
    font-size: var(--text-base);
    color: var(--color-ink-light);
    margin: 0;
}

.quote-card {
    background: var(--color-ink);
    color: var(--color-paper);
    padding: var(--space-10);
    border-radius: 2px;
    position: relative;
}

.quote-card::before {
    content: '"';
    font-family: var(--font-display);
    font-size: 120px;
    line-height: 1;
    color: var(--color-accent);
    opacity: 0.3;
    position: absolute;
    top: -20px;
    left: var(--space-6);
}

.quote-card blockquote {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-style: italic;
    line-height: 1.5;
    margin-bottom: var(--space-6);
    position: relative;
    z-index: 1;
}

.quote-card cite {
    font-size: var(--text-sm);
    font-style: normal;
    opacity: 0.7;
}

/* Chapters Section */
.chapters {
    background: var(--color-parchment);
}

.chapters-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-6);
}

.chapter-card {
    background: var(--color-paper);
    padding: var(--space-6);
    border-radius: 2px;
    border: 1px solid var(--color-parchment-dark);
    transition: all var(--transition-base);
}

.chapter-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-accent);
}

.chapter-number {
    font-family: var(--font-display);
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--color-accent);
    display: block;
    margin-bottom: var(--space-3);
}

.chapter-card h3 {
    font-size: var(--text-lg);
    margin-bottom: var(--space-3);
}

.chapter-card p {
    font-size: var(--text-sm);
    color: var(--color-ink-light);
    margin: 0;
}

.chapters-cta {
    text-align: center;
    margin-top: var(--space-12);
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-parchment-dark);
}

.chapters-cta p {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-style: italic;
    color: var(--color-ink-light);
    margin: 0;
}

/* Author Section */
.author-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--space-16);
    align-items: center;
}

.author-portrait {
    width: 100%;
    aspect-ratio: 1;
    background: var(--color-parchment);
    border-radius: 2px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.portrait-placeholder {
    width: 200px;
    height: 200px;
    background: var(--color-ink);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-paper);
    font-family: var(--font-display);
    font-size: var(--text-5xl);
    font-weight: 700;
}

.author-bio .lead {
    margin-bottom: var(--space-6);
}

.author-credentials {
    display: flex;
    gap: var(--space-10);
    margin-top: var(--space-10);
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-parchment);
}

.credential {
    display: flex;
    flex-direction: column;
}

.credential-number {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-accent);
}

.credential-label {
    font-size: var(--text-sm);
    color: var(--color-ink-light);
}

/* Reviews Section */
.reviews {
    background: var(--color-parchment);
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
}

.review-card {
    background: var(--color-paper);
    padding: var(--space-8);
    border-radius: 2px;
    border: 1px solid var(--color-parchment-dark);
}

.review-card.featured {
    grid-column: span 2;
    background: var(--color-ink);
    color: var(--color-paper);
}

.review-stars {
    color: var(--color-accent);
    font-size: var(--text-lg);
    margin-bottom: var(--space-4);
    letter-spacing: 0.1em;
}

.review-card.featured .review-stars {
    color: #D4A574;
}

.review-card blockquote {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-style: italic;
    line-height: 1.5;
    margin-bottom: var(--space-6);
}

.review-card.featured blockquote {
    font-size: var(--text-2xl);
}

.review-author {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.author-avatar {
    width: 48px;
    height: 48px;
    background: var(--color-parchment);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--text-sm);
    color: var(--color-ink);
}

.review-card.featured .author-avatar {
    background: var(--color-parchment);
    color: var(--color-ink);
}

.author-info {
    display: flex;
    flex-direction: column;
}

.author-name {
    font-weight: 600;
    color: var(--color-ink);
}

.review-card.featured .author-name {
    color: var(--color-paper);
}

.author-title {
    font-size: var(--text-sm);
    color: var(--color-ink-light);
}

.review-card.featured .author-title {
    color: rgba(244, 236, 216, 0.7);
}

/* CTA Section */
.cta {
    text-align: center;
}

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

.cta-subtitle {
    font-size: var(--text-xl);
    color: var(--color-ink-light);
    margin-bottom: var(--space-10);
}

.pricing-card {
    background: var(--color-paper);
    border: 2px solid var(--color-ink);
    border-radius: 2px;
    padding: var(--space-10);
    margin-bottom: var(--space-16);
    position: relative;
}

.pricing-card::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 8px;
    right: -8px;
    bottom: -8px;
    background: var(--color-parchment);
    z-index: -1;
    border-radius: 2px;
}

.pricing-header {
    margin-bottom: var(--space-6);
}

.pricing-header h3 {
    font-size: var(--text-2xl);
    margin-bottom: var(--space-2);
}

.pricing-format {
    font-size: var(--text-sm);
    color: var(--color-ink-light);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.pricing-price {
    margin-bottom: var(--space-8);
}

.pricing-price .currency {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    vertical-align: top;
}

.pricing-price .amount {
    font-family: var(--font-display);
    font-size: var(--text-6xl);
    font-weight: 700;
    line-height: 1;
}

.pricing-features {
    text-align: left;
    margin-bottom: var(--space-8);
    padding: var(--space-6) 0;
    border-top: 1px solid var(--color-parchment);
    border-bottom: 1px solid var(--color-parchment);
}

.pricing-features li {
    padding: var(--space-3) 0;
    padding-left: var(--space-8);
    position: relative;
}

.pricing-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: 700;
}

.pricing-guarantee {
    font-size: var(--text-sm);
    color: var(--color-ink-light);
    margin-top: var(--space-6);
    margin-bottom: 0;
}

/* FAQ */
.faq-preview {
    text-align: left;
}

.faq-preview h4 {
    text-align: center;
    margin-bottom: var(--space-6);
}

.faq-item {
    border-bottom: 1px solid var(--color-parchment);
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-4) 0;
    background: none;
    border: none;
    font-family: var(--font-body);
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-ink);
    cursor: pointer;
    text-align: left;
}

.faq-question svg {
    transition: transform var(--transition-base);
    flex-shrink: 0;
}

.faq-question[aria-expanded="true"] svg {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
}

.faq-answer p {
    padding-bottom: var(--space-4);
    color: var(--color-ink-light);
    margin: 0;
}

.faq-question[aria-expanded="true"] + .faq-answer {
    max-height: 200px;
}

/* Footer */
.footer {
    background: var(--color-ink);
    color: var(--color-paper);
    padding: var(--space-16) 0 var(--space-8);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-16);
    margin-bottom: var(--space-12);
}

.footer-logo {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 600;
    display: block;
    margin-bottom: var(--space-2);
}

.footer-brand p {
    color: rgba(244, 236, 216, 0.7);
    margin: 0;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
}

.footer-column h4 {
    font-size: var(--text-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-4);
    color: var(--color-parchment);
}

.footer-column a {
    display: block;
    padding: var(--space-2) 0;
    color: rgba(244, 236, 216, 0.7);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-8);
    border-top: 1px solid rgba(244, 236, 216, 0.1);
}

.footer-bottom p {
    font-size: var(--text-sm);
    color: rgba(244, 236, 216, 0.5);
    margin: 0;
}

.footer-legal {
    display: flex;
    gap: var(--space-6);
}

.footer-legal a {
    font-size: var(--text-sm);
    color: rgba(244, 236, 216, 0.5);
}

.footer-legal a:hover {
    color: var(--color-paper);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--space-12);
    }
    
    .hero-content {
        max-width: 100%;
    }
    
    .hero-cta-group {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .problem-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .solution-content {
        grid-template-columns: 1fr;
    }
    
    .chapters-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .author-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .author-portrait {
        max-width: 300px;
        margin: 0 auto;
    }
    
    .author-credentials {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--color-paper);
        flex-direction: column;
        padding: var(--space-6);
        gap: var(--space-4);
        border-bottom: 1px solid var(--color-parchment);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
    
    .hero {
        padding-top: calc(var(--space-16) + 60px);
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--space-6);
    }
    
    .problem-grid {
        grid-template-columns: 1fr;
    }
    
    .chapters-grid {
        grid-template-columns: 1fr;
    }
    
    .reviews-grid {
        grid-template-columns: 1fr;
    }
    
    .review-card.featured {
        grid-column: span 1;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--space-4);
        text-align: center;
    }
    
    .author-credentials {
        flex-direction: column;
        gap: var(--space-6);
    }
}

@media (max-width: 480px) {
    :root {
        --space-24: 4rem;
        --space-16: 3rem;
    }
    
    .hero-title {
        font-size: var(--text-4xl);
    }
    
    .book-showcase {
        width: 220px;
        height: 320px;
    }
    
    .book-cover {
        width: 180px;
    }
    
    .btn {
        width: 100%;
    }
    
    .hero-cta-group {
        flex-direction: column;
    }
}