* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #8B6B4D;
    --primary-light: #B89B7E;
    --primary-dark: #5A3E2B;
    --accent: #C6A27A;
    --dark: #1E1E1E;
    --dark-light: #2C2C2C;
    --light: #F8F6F4;
    --light-gray: #EDE9E5;
    --white: #FFFFFF;
    --text-primary: #1E1E1E;
    --text-secondary: #5E5E5E;
    --text-light: #8E8E8E;
    --border: #E0D9D2;
    --success: #4A7A6C;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-secondary: 'Playfair Display', Georgia, serif;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    color: var(--text-primary);
    line-height: 1.6;
    background: var(--white);
    overflow-x: hidden;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-secondary);
    font-weight: 500;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.5rem, 5vw, 3.5rem); }
h2 { font-size: clamp(2rem, 4vw, 2.8rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.2rem, 2vw, 1.5rem); }

p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.8;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 32px;
    background: var(--primary);
    color: var(--white);
    font-weight: 500;
    font-size: 0.95rem;
    letter-spacing: 0.5px;
    text-decoration: none;
    border: 1px solid var(--primary);
    border-radius: 4px;
    transition: var(--transition);
    cursor: pointer;
    gap: 8px;
}

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

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
}

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

.btn-large {
    padding: 16px 40px;
    font-size: 1.1rem;
}

/* Header */
header {
    background: var(--white);
    padding: 5px 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

header.scrolled {
    padding: 12px 0;
    box-shadow: var(--shadow-sm);
}

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

.logo-img {
    height: 48px;
    width: auto;
    transition: var(--transition);
}

.logo-img:hover {
    opacity: 0.8;
}

/* Navigation */
nav ul {
    display: flex;
    list-style: none;
    gap: 48px;
}

nav a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

nav a:hover {
    color: var(--primary);
}

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

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

/* Mobile Menu */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 28px;
    cursor: pointer;
    color: var(--text-primary);
    padding: 8px;
    transition: var(--transition);
}

.mobile-menu-btn:hover {
    color: var(--primary);
}

.mobile-nav {
    display: none;
    position: fixed;
    top: 0;
    right: -100%;
    width: 300px;
    height: 100vh;
    background: var(--white);
    z-index: 1001;
    padding: 80px 32px 32px;
    transition: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-lg);
}

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

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

.mobile-nav li {
    border-bottom: 1px solid var(--border);
}

.mobile-nav a {
    display: block;
    padding: 16px 0;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.mobile-nav a:hover {
    color: var(--primary);
    padding-left: 8px;
}

.mobile-close {
    position: absolute;
    top: 24px;
    right: 24px;
    background: none;
    border: none;
    font-size: 32px;
    cursor: pointer;
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.mobile-close:hover {
    color: var(--primary);
    transform: rotate(90deg);
}

.mobile-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.mobile-overlay.active {
    opacity: 1;
}

/* Hero Section */
.hero {
    min-height: 90vh;
    display: flex;
    align-items: center;
    padding: 120px 0 60px;
    background: linear-gradient(135deg, var(--light) 0%, var(--white) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: linear-gradient(135deg, transparent 0%, rgba(139, 107, 77, 0.03) 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 650px;
}

.hero-badge {
    display: inline-block;
    padding: 8px 16px;
    background: rgba(139, 107, 77, 0.1);
    color: var(--primary);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    border-radius: 4px;
    margin-bottom: 24px;
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    margin-bottom: 16px;
    color: var(--dark);
    line-height: 1.1;
}

.hero p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* Sections */
section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}

.section-badge {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(139, 107, 77, 0.1);
    color: var(--primary);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    border-radius: 4px;
    margin-bottom: 16px;
    text-transform: uppercase;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.8rem);
    color: var(--dark);
    margin-bottom: 16px;
    line-height: 1.2;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 60px;
    align-items: center;
}

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

.about-image img {
    max-width: 100%;
    height: auto;
    max-height: 300px;
    filter: drop-shadow(var(--shadow-md));
}

.about-text h3 {
    color: var(--primary);
    margin-bottom: 20px;
    font-size: 1.8rem;
}

.expertise-list {
    list-style: none;
    margin: 30px 0;
}

.expertise-list li {
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

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

.expertise-list strong {
    color: var(--primary);
    min-width: 150px;
    font-weight: 600;
}

.expertise-list span {
    color: var(--text-secondary);
}

/* Book Preview Section */
.book-preview-section {
    background: var(--light);
}

.book-preview-content {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 60px;
    align-items: center;
}

.book-preview-images {
    position: relative;
}

.main-book-image {
    width: 100%;
    max-width: 400px;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

.main-book-image:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.book-badge-new {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--primary);
    color: var(--white);
    padding: 8px 16px;
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.8rem;
    letter-spacing: 0.5px;
}

.book-preview-details h3 {
    color: var(--primary);
    margin-bottom: 20px;
    font-size: 1.8rem;
}

.book-intro {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.8;
}

.book-highlights {
    display: grid;
    gap: 20px;
    margin-bottom: 32px;
}

.highlight-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.highlight-icon {
    font-size: 2rem;
    min-width: 48px;
}

.highlight-item h4 {
    font-size: 1.2rem;
    margin-bottom: 6px;
    color: var(--dark);
}

.highlight-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.book-preview-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 32px;
    padding: 24px;
    background: var(--white);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

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

.stat-number {
    display: block;
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--primary);
    font-family: var(--font-secondary);
    line-height: 1.2;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.book-preview-cta {
    display: flex;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
}

.preview-price {
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.price-currency {
    font-size: 1.2rem;
    color: var(--primary);
    font-weight: 500;
}

.price-amount {
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--primary);
    font-family: var(--font-secondary);
    line-height: 1;
}

/* Contact Form Section */
.contact-form {
    max-width: 700px;
    margin: 0 auto;
    background: var(--white);
    padding: 48px;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
    background: var(--white);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(139, 107, 77, 0.1);
}

.form-group textarea {
    min-height: 140px;
    resize: vertical;
}

.form-checkbox {
    display: flex;
    align-items: center;
    gap: 8px;
}

.form-checkbox input {
    width: auto;
}

.form-checkbox label {
    margin-bottom: 0;
    font-weight: normal;
}

/* Contact Info Cards */
.contact-info-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 60px;
}

.contact-info-card {
    background: var(--white);
    padding: 40px 30px;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    text-align: center;
    transition: var(--transition);
}

.contact-info-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.contact-card-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.contact-info-card h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
    color: var(--dark);
}

.contact-info-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 20px;
    word-break: break-word;
}

.contact-link {
    display: inline-block;
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
}

.contact-link:hover {
    color: var(--primary-dark);
    transform: translateX(4px);
}

/* Shop Page Styles */
.shop-header {
    background: var(--light);
    padding: 140px 0 60px;
    text-align: center;
    position: relative;
}

.shop-header h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    color: var(--dark);
    margin-bottom: 16px;
}

.shop-subtitle {
    max-width: 600px;
    margin: 0 auto;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.back-link {
    display: inline-block;
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    margin-bottom: 20px;
    transition: var(--transition);
}

.back-link:hover {
    transform: translateX(-5px);
}

.shop-section {
    padding: 60px 0 80px;
}

.shop-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
    margin-bottom: 80px;
}

.book-images-grid {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.book-image-item {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    transition: var(--transition);
}

.book-image-item:hover {
    box-shadow: var(--shadow-md);
}

.book-image-item img {
    width: 100%;
    border-radius: 4px;
    margin-bottom: 12px;
}

.image-caption {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.book-details-card {
    background: var(--white);
    padding: 48px;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
}

.book-details-card h2 {
    font-size: clamp(2rem, 3vw, 2.5rem);
    margin-bottom: 24px;
    color: var(--dark);
    line-height: 1.2;
}

.book-price-tag {
    display: flex;
    align-items: baseline;
    gap: 12px;
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
}

.book-price-tag .currency {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--primary);
}

.book-price-tag .amount {
    font-size: 3rem;
    font-weight: 600;
    color: var(--primary);
    font-family: var(--font-secondary);
    line-height: 1;
}

.price-note {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-left: auto;
    align-self: center;
}

.book-description {
    margin-bottom: 40px;
}

.book-description h3 {
    font-size: 1.5rem;
    margin-bottom: 16px;
    color: var(--dark);
}

.book-description p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.8;
}

.book-features-list {
    margin-bottom: 40px;
}

.book-features-list h3 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    color: var(--dark);
}

.book-features-list ul {
    list-style: none;
}

.book-features-list li {
    display: flex;
    gap: 12px;
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
    align-items: center;
}

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

.feature-check {
    color: var(--primary);
    font-size: 1.2rem;
    font-weight: 600;
    min-width: 24px;
}

.book-cta-section {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.secure-note {
    margin-top: 16px;
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Book Overview Grid */
.book-overview {
    margin-top: 80px;
}

.overview-title {
    text-align: center;
    font-size: clamp(2rem, 4vw, 2.5rem);
    margin-bottom: 48px;
    color: var(--dark);
}

.overview-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.overview-card {
    background: var(--white);
    padding: 40px 30px;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    transition: var(--transition);
    text-align: center;
}

.overview-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.overview-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 20px;
}

.overview-card h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
    color: var(--dark);
}

.overview-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Trust Badges */
.trust-badges {
    margin-top: 60px;
}

.badges-container {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.badge-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.badge-item span:first-child {
    color: var(--primary);
    font-size: 1.1rem;
}

/* Book Detail Page */
.book-detail-page {
    padding: 140px 0 80px;
    background: var(--light);
    min-height: 100vh;
}

.book-detail-container {
    max-width: 1000px;
    margin: 0 auto;
    background: var(--white);
    border-radius: 12px;
    padding: 48px;
    box-shadow: var(--shadow-md);
}

.book-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
}

.book-cover-grid {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.book-cover-grid img {
    width: 100%;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.book-cover-grid img:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-md);
}

.payment-section {
    background: var(--light);
    padding: 32px;
    border-radius: 8px;
    margin-top: 32px;
}

.payment-section h3 {
    font-size: 1.5rem;
    margin-bottom: 24px;
    color: var(--dark);
}

/* Footer */
footer {
    background: var(--dark);
    color: var(--white);
    padding: 60px 0 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-section h4 {
    color: var(--white);
    margin-bottom: 24px;
    font-size: 1.2rem;
    font-weight: 500;
}

.footer-logo-img {
    height: 48px;
    margin-bottom: 20px;
    filter: brightness(0) invert(1);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
    font-size: 0.95rem;
}

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

.footer-section li {
    margin-bottom: 12px;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
    font-size: 0.95rem;
}

.footer-section a:hover {
    color: var(--primary-light);
    padding-left: 5px;
}

.social-links {
    display: flex;
    gap: 16px;
    margin-top: 20px;
}

.social-link {
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    color: var(--white);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

.social-link:hover {
    background: var(--primary);
    transform: translateY(-2px);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 12px;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
}

.contact-icon {
    width: 36px;
    height: 36px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-light);
}

.newsletter-form {
    display: flex;
    gap: 8px;
    margin: 20px 0 10px;
}

.newsletter-form input {
    flex: 1;
    padding: 12px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    color: var(--white);
    font-size: 0.95rem;
}

.newsletter-form input::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.newsletter-form input:focus {
    outline: none;
    border-color: var(--primary-light);
}

.newsletter-form button {
    padding: 12px 20px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 4px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.newsletter-form button:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.newsletter-text {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.5);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
}

.footer-bottom-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-light);
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .container { padding: 0 32px; }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .overview-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    nav ul { display: none; }
    
    .mobile-menu-btn { display: block; }
    .mobile-nav { display: block; }
    .mobile-overlay { display: block; }
    
    .hero { padding: 100px 0 50px; }
    .hero-buttons { flex-direction: column; }
    .hero-buttons .btn { width: 100%; }
    
    .about-content,
    .book-preview-content,
    .shop-content,
    .book-detail-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .about-image img {
        max-height: 200px;
    }
    
    .contact-info-grid,
    .overview-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-bottom-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        justify-content: center;
    }
    
    section { padding: 60px 0; }
    .section-header { margin-bottom: 40px; }
    
    .contact-form,
    .book-details-card,
    .book-detail-container {
        padding: 30px;
    }
    
    .book-preview-cta {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .badges-container {
        gap: 20px;
    }
}

@media (max-width: 480px) {
    .container { padding: 0 20px; }
    
    .hero h1 { font-size: 2.2rem; }
    .hero p { font-size: 1rem; }
    
    .expertise-list li {
        flex-direction: column;
        gap: 4px;
    }
    
    .expertise-list strong {
        min-width: auto;
    }
    
    .book-price-tag {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .price-note {
        margin-left: 0;
    }
    
    .book-cover-grid {
        gap: 16px;
    }
    
    .footer-links {
        flex-wrap: wrap;
        gap: 16px;
    }
    
    .newsletter-form {
        flex-direction: column;
    }
}