/* ============================================
   AI Operator Series — Book Pages Stylesheet
   Extends styles.css design system
   ============================================ */

/* --- Hero Section --- */
.book-hero {
    background: var(--gradient-secondary);
    padding: 140px 0 80px;
    position: relative;
    overflow: hidden;
    color: var(--white);
}

.book-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 80%, rgba(0, 204, 102, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(0, 102, 204, 0.15) 0%, transparent 50%);
    pointer-events: none;
}

.book-hero .container {
    position: relative;
    z-index: 1;
}

.book-hero .hero-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.25);
    padding: 6px 16px;
    border-radius: 20px;
    font-family: var(--font-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.5px;
    margin-bottom: 20px;
    color: var(--white);
}

.book-hero .hero-title {
    font-family: var(--font-primary);
    font-size: clamp(1.8rem, 4vw, 3rem);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--white);
}

.book-hero .hero-title .highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.book-hero .hero-subtitle {
    font-family: var(--font-secondary);
    font-size: 1.15rem;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.85);
    max-width: 700px;
    margin-bottom: 30px;
}

.book-hero .hero-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

/* --- Series Landing Page --- */
.series-intro {
    padding: var(--section-padding);
    background: var(--white);
}

.series-intro .container {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.series-intro h2 {
    font-family: var(--font-primary);
    font-size: clamp(1.5rem, 3vw, 2.2rem);
    margin-bottom: 20px;
    color: var(--dark-gray);
}

.series-intro p {
    font-family: var(--font-secondary);
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--medium-gray);
}

/* Book Grid */
.books-section {
    padding: var(--section-padding);
    background: var(--light-gray);
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.book-card {
    background: var(--white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    display: flex;
    flex-direction: column;
}

.book-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

.book-card-header {
    background: var(--gradient-primary);
    padding: 30px;
    text-align: center;
    position: relative;
}

.book-card-header .book-number {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    color: var(--white);
    font-family: var(--font-primary);
    font-size: 0.8rem;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 12px;
    margin-bottom: 12px;
}

.book-card-header h3 {
    font-family: var(--font-primary);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--white);
    line-height: 1.3;
}

.book-card-body {
    padding: 25px 30px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.book-card-body .book-tagline {
    font-family: var(--font-secondary);
    font-size: 0.95rem;
    color: var(--primary-blue);
    font-weight: 600;
    margin-bottom: 12px;
}

.book-card-body p {
    font-family: var(--font-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--medium-gray);
    margin-bottom: 20px;
}

.book-card-body .book-topics {
    list-style: none;
    padding: 0;
    margin: 0 0 20px 0;
}

.book-card-body .book-topics li {
    font-family: var(--font-secondary);
    font-size: 0.9rem;
    color: var(--dark-gray);
    padding: 6px 0;
    padding-left: 22px;
    position: relative;
}

.book-card-body .book-topics li::before {
    content: '\2713';
    position: absolute;
    left: 0;
    color: var(--primary-green);
    font-weight: 700;
}

.book-card-footer {
    padding: 0 30px 25px;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.book-card-footer .btn {
    flex: 1;
    min-width: 120px;
    text-align: center;
}

/* "Which book is for me?" Quiz */
.book-quiz-section {
    padding: var(--section-padding);
    background: var(--white);
}

.quiz-container {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.quiz-question {
    font-family: var(--font-secondary);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--dark-gray);
    margin-bottom: 30px;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 30px;
}

.quiz-option {
    background: var(--light-gray);
    border: 2px solid transparent;
    border-radius: 12px;
    padding: 16px 20px;
    font-family: var(--font-secondary);
    font-size: 1rem;
    color: var(--dark-gray);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
}

.quiz-option:hover {
    border-color: var(--primary-blue);
    background: var(--light-blue);
}

.quiz-option.selected {
    border-color: var(--primary-green);
    background: var(--light-green);
}

.quiz-result {
    display: none;
    background: var(--light-gray);
    border-radius: 16px;
    padding: 30px;
    text-align: center;
}

.quiz-result.visible {
    display: block;
}

.quiz-result h3 {
    font-family: var(--font-primary);
    font-size: 1.3rem;
    color: var(--dark-gray);
    margin-bottom: 10px;
}

.quiz-result p {
    font-family: var(--font-secondary);
    color: var(--medium-gray);
    margin-bottom: 20px;
}

/* --- Community Page --- */
.community-benefits {
    padding: var(--section-padding);
    background: var(--white);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.benefit-card {
    text-align: center;
    padding: 30px 25px;
    background: var(--light-gray);
    border-radius: 16px;
    transition: transform var(--transition-fast);
}

.benefit-card:hover {
    transform: translateY(-3px);
}

.benefit-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.benefit-card h3 {
    font-family: var(--font-primary);
    font-size: 1.1rem;
    color: var(--dark-gray);
    margin-bottom: 10px;
}

.benefit-card p {
    font-family: var(--font-secondary);
    font-size: 0.95rem;
    color: var(--medium-gray);
    line-height: 1.6;
}

/* Community Channels */
.community-channels {
    padding: var(--section-padding);
    background: var(--light-gray);
}

.channels-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    margin-top: 40px;
}

.channel-card {
    background: var(--white);
    border-radius: 16px;
    padding: 30px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    border-left: 4px solid var(--primary-blue);
    transition: transform var(--transition-fast);
}

.channel-card:hover {
    transform: translateY(-3px);
}

.channel-card h3 {
    font-family: var(--font-primary);
    font-size: 1.05rem;
    color: var(--dark-gray);
    margin-bottom: 8px;
}

.channel-card p {
    font-family: var(--font-secondary);
    font-size: 0.9rem;
    color: var(--medium-gray);
    line-height: 1.6;
    margin-bottom: 15px;
}

/* --- Newsletter Page --- */
.newsletter-signup {
    padding: var(--section-padding);
    background: var(--white);
}

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

.signup-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 30px;
}

.signup-form input[type="email"],
.signup-form input[type="text"] {
    padding: 14px 20px;
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    font-family: var(--font-secondary);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
    width: 100%;
    box-sizing: border-box;
}

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

.signup-form .btn-primary {
    width: 100%;
    padding: 14px;
    font-size: 1.05rem;
}

.newsletter-topics {
    padding: var(--section-padding);
    background: var(--light-gray);
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-top: 40px;
}

.topic-card {
    background: var(--white);
    border-radius: 12px;
    padding: 25px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.topic-card h3 {
    font-family: var(--font-primary);
    font-size: 1rem;
    color: var(--dark-gray);
    margin-bottom: 8px;
}

.topic-card p {
    font-family: var(--font-secondary);
    font-size: 0.9rem;
    color: var(--medium-gray);
    line-height: 1.6;
}

/* --- Resource Pages --- */
.resources-section {
    padding: var(--section-padding);
    background: var(--white);
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    margin-top: 40px;
}

.resource-card {
    background: var(--white);
    border: 1px solid #e8e8e8;
    border-radius: 16px;
    padding: 25px;
    transition: all var(--transition-fast);
    display: flex;
    flex-direction: column;
}

.resource-card:hover {
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
    transform: translateY(-3px);
}

.resource-card .resource-type {
    display: inline-block;
    background: var(--light-blue);
    color: var(--primary-blue);
    font-family: var(--font-secondary);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 4px 10px;
    border-radius: 6px;
    margin-bottom: 12px;
    align-self: flex-start;
}

.resource-card .resource-type.download {
    background: var(--light-green);
    color: var(--dark-green);
}

.resource-card .resource-type.video {
    background: #FFF3E0;
    color: #E65100;
}

.resource-card .resource-type.github {
    background: #F3E5F5;
    color: #7B1FA2;
}

.resource-card .resource-type.community {
    background: #E8EAF6;
    color: #283593;
}

.resource-card h3 {
    font-family: var(--font-primary);
    font-size: 1.05rem;
    color: var(--dark-gray);
    margin-bottom: 8px;
}

.resource-card p {
    font-family: var(--font-secondary);
    font-size: 0.9rem;
    color: var(--medium-gray);
    line-height: 1.6;
    margin-bottom: 15px;
    flex: 1;
}

.resource-card .btn {
    align-self: flex-start;
}

/* --- Lead Magnet / Download Pages --- */
.lead-magnet-section {
    padding: var(--section-padding);
    background: var(--white);
}

.lead-magnet-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
    max-width: 1000px;
    margin: 0 auto;
}

.lead-magnet-content h2 {
    font-family: var(--font-primary);
    font-size: clamp(1.4rem, 3vw, 2rem);
    color: var(--dark-gray);
    margin-bottom: 15px;
}

.lead-magnet-content p {
    font-family: var(--font-secondary);
    font-size: 1rem;
    color: var(--medium-gray);
    line-height: 1.7;
    margin-bottom: 20px;
}

.lead-magnet-features {
    list-style: none;
    padding: 0;
    margin: 0 0 25px 0;
}

.lead-magnet-features li {
    font-family: var(--font-secondary);
    font-size: 0.95rem;
    color: var(--dark-gray);
    padding: 8px 0;
    padding-left: 28px;
    position: relative;
    line-height: 1.5;
}

.lead-magnet-features li::before {
    content: '\2713';
    position: absolute;
    left: 0;
    color: var(--primary-green);
    font-weight: 700;
    font-size: 1.1rem;
}

.lead-magnet-form {
    background: var(--light-gray);
    border-radius: 16px;
    padding: 35px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.lead-magnet-form h3 {
    font-family: var(--font-primary);
    font-size: 1.15rem;
    color: var(--dark-gray);
    margin-bottom: 20px;
    text-align: center;
}

.lead-magnet-form .form-group {
    margin-bottom: 15px;
}

.lead-magnet-form label {
    display: block;
    font-family: var(--font-secondary);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--dark-gray);
    margin-bottom: 5px;
}

.lead-magnet-form input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-family: var(--font-secondary);
    font-size: 0.95rem;
    transition: border-color var(--transition-fast);
    box-sizing: border-box;
}

.lead-magnet-form input:focus {
    outline: none;
    border-color: var(--primary-blue);
}

.lead-magnet-form .btn-primary {
    width: 100%;
    padding: 14px;
    margin-top: 10px;
    font-size: 1rem;
}

.lead-magnet-form .form-note {
    font-family: var(--font-secondary);
    font-size: 0.8rem;
    color: var(--medium-gray);
    text-align: center;
    margin-top: 12px;
}

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

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-top: 40px;
}

.preview-card {
    background: var(--white);
    border-radius: 14px;
    padding: 25px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
}

.preview-icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
}

.preview-card h3 {
    font-family: var(--font-primary);
    font-size: 1rem;
    color: var(--dark-gray);
    margin-bottom: 8px;
}

.preview-card p {
    font-family: var(--font-secondary);
    font-size: 0.9rem;
    color: var(--medium-gray);
    line-height: 1.6;
}

/* --- Breadcrumb --- */
.book-breadcrumb {
    padding: 12px 0;
    background: rgba(0, 0, 0, 0.2);
}

.book-breadcrumb ol {
    list-style: none;
    display: flex;
    gap: 8px;
    align-items: center;
    padding: 0;
    margin: 0;
    font-family: var(--font-secondary);
    font-size: 0.85rem;
}

.book-breadcrumb li + li::before {
    content: '/';
    margin-right: 8px;
    color: rgba(255, 255, 255, 0.5);
}

.book-breadcrumb a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.book-breadcrumb a:hover {
    color: var(--white);
}

.book-breadcrumb .current {
    color: var(--white);
    font-weight: 500;
}

/* --- Bundle / Course Section --- */
.bundle-section {
    padding: var(--section-padding);
    background: var(--gradient-secondary);
    color: var(--white);
    text-align: center;
}

.bundle-section h2 {
    font-family: var(--font-primary);
    font-size: clamp(1.5rem, 3vw, 2.2rem);
    margin-bottom: 15px;
    color: var(--white);
}

.bundle-section p {
    font-family: var(--font-secondary);
    font-size: 1.05rem;
    color: rgba(255, 255, 255, 0.85);
    max-width: 600px;
    margin: 0 auto 30px;
    line-height: 1.7;
}

.pricing-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    max-width: 900px;
    margin: 0 auto;
}

.pricing-card {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 16px;
    padding: 30px;
    backdrop-filter: blur(10px);
    transition: transform var(--transition-fast);
}

.pricing-card:hover {
    transform: translateY(-3px);
}

.pricing-card.featured {
    border-color: var(--primary-green);
    background: rgba(255, 255, 255, 0.15);
    position: relative;
}

.pricing-card.featured::before {
    content: 'Most Popular';
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-green);
    color: var(--white);
    font-family: var(--font-secondary);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 16px;
    border-radius: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.pricing-card h3 {
    font-family: var(--font-primary);
    font-size: 1.1rem;
    color: var(--white);
    margin-bottom: 8px;
}

.pricing-card .price {
    font-family: var(--font-primary);
    font-size: 2rem;
    font-weight: 900;
    color: var(--white);
    margin-bottom: 15px;
}

.pricing-card .price span {
    font-size: 1rem;
    font-weight: 400;
    opacity: 0.7;
}

.pricing-card ul {
    list-style: none;
    padding: 0;
    margin: 0 0 20px 0;
    text-align: left;
}

.pricing-card ul li {
    font-family: var(--font-secondary);
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.85);
    padding: 6px 0;
    padding-left: 22px;
    position: relative;
}

.pricing-card ul li::before {
    content: '\2713';
    position: absolute;
    left: 0;
    color: var(--primary-green);
    font-weight: 700;
}

.pricing-card .btn {
    width: 100%;
    text-align: center;
}

/* --- Errata / Updates Section --- */
.updates-section {
    padding: var(--section-padding);
    background: var(--light-gray);
}

.updates-list {
    max-width: 700px;
    margin: 30px auto 0;
}

.update-item {
    background: var(--white);
    border-radius: 12px;
    padding: 20px 25px;
    margin-bottom: 15px;
    display: flex;
    gap: 15px;
    align-items: flex-start;
    box-shadow: 0 1px 6px rgba(0, 0, 0, 0.04);
}

.update-date {
    font-family: var(--font-secondary);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary-blue);
    white-space: nowrap;
    min-width: 90px;
}

.update-content h4 {
    font-family: var(--font-secondary);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--dark-gray);
    margin-bottom: 4px;
}

.update-content p {
    font-family: var(--font-secondary);
    font-size: 0.9rem;
    color: var(--medium-gray);
    line-height: 1.5;
}

/* --- CTA Banner --- */
.book-cta {
    padding: 60px 0;
    background: var(--gradient-primary);
    text-align: center;
    color: var(--white);
}

.book-cta h2 {
    font-family: var(--font-primary);
    font-size: clamp(1.3rem, 3vw, 1.8rem);
    margin-bottom: 12px;
    color: var(--white);
}

.book-cta p {
    font-family: var(--font-secondary);
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 25px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.book-cta .btn-secondary {
    background: var(--white);
    color: var(--primary-blue);
    border: none;
}

.book-cta .btn-secondary:hover {
    background: var(--light-gray);
}

/* --- Section Titles (shared) --- */
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 40px;
}

.section-header h2 {
    font-family: var(--font-primary);
    font-size: clamp(1.4rem, 3vw, 2rem);
    color: var(--dark-gray);
    margin-bottom: 12px;
}

.section-header p {
    font-family: var(--font-secondary);
    font-size: 1rem;
    color: var(--medium-gray);
    line-height: 1.7;
}

/* --- Frameworks Comparison Table --- */
.comparison-table-wrapper {
    overflow-x: auto;
    margin-top: 30px;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-secondary);
    min-width: 700px;
}

.comparison-table thead {
    background: var(--gradient-primary);
}

.comparison-table th {
    color: var(--white);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 14px 16px;
    text-align: left;
}

.comparison-table td {
    padding: 12px 16px;
    font-size: 0.9rem;
    color: var(--dark-gray);
    border-bottom: 1px solid #eee;
}

.comparison-table tbody tr:hover {
    background: var(--light-blue);
}

.comparison-table .rating {
    color: var(--primary-green);
    font-weight: 600;
}

/* --- Interactive Breach Timeline --- */
.breach-timeline {
    max-width: 800px;
    margin: 40px auto 0;
}

.breach-item {
    background: var(--white);
    border-radius: 14px;
    padding: 25px;
    margin-bottom: 20px;
    border-left: 4px solid var(--primary-blue);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.breach-item:hover {
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
}

.breach-item.severity-critical {
    border-left-color: #E53935;
}

.breach-item.severity-high {
    border-left-color: #FB8C00;
}

.breach-item.severity-medium {
    border-left-color: #FDD835;
}

.breach-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.breach-header h3 {
    font-family: var(--font-primary);
    font-size: 1.05rem;
    color: var(--dark-gray);
}

.breach-date {
    font-family: var(--font-secondary);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--medium-gray);
}

.breach-severity {
    display: inline-block;
    font-family: var(--font-secondary);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 3px 10px;
    border-radius: 6px;
    margin-bottom: 10px;
}

.breach-severity.critical {
    background: #FFEBEE;
    color: #C62828;
}

.breach-severity.high {
    background: #FFF3E0;
    color: #E65100;
}

.breach-severity.medium {
    background: #FFFDE7;
    color: #F9A825;
}

.breach-details {
    font-family: var(--font-secondary);
    font-size: 0.9rem;
    color: var(--medium-gray);
    line-height: 1.6;
}

.breach-lessons {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid #eee;
}

.breach-lessons h4 {
    font-family: var(--font-secondary);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--dark-gray);
    margin-bottom: 5px;
}

/* --- Checklist Section --- */
.checklist-section {
    padding: var(--section-padding);
    background: var(--white);
}

.checklist-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 25px;
    margin-top: 40px;
}

.checklist-category {
    background: var(--light-gray);
    border-radius: 14px;
    padding: 25px;
}

.checklist-category h3 {
    font-family: var(--font-primary);
    font-size: 1.05rem;
    color: var(--dark-gray);
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-blue);
}

.checklist-items {
    list-style: none;
    padding: 0;
    margin: 0;
}

.checklist-items li {
    font-family: var(--font-secondary);
    font-size: 0.9rem;
    color: var(--dark-gray);
    padding: 8px 0;
    padding-left: 28px;
    position: relative;
    line-height: 1.4;
}

.checklist-items li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 16px;
    height: 16px;
    border: 2px solid var(--primary-blue);
    border-radius: 4px;
}

/* --- Video embed --- */
.video-section {
    padding: var(--section-padding);
    background: var(--light-gray);
}

.video-container {
    max-width: 800px;
    margin: 30px auto 0;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
    background: var(--dark-gray);
    aspect-ratio: 16 / 9;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-placeholder {
    text-align: center;
    color: rgba(255, 255, 255, 0.7);
    font-family: var(--font-secondary);
}

.video-placeholder .play-icon {
    font-size: 4rem;
    display: block;
    margin-bottom: 10px;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .book-hero {
        padding: 120px 0 60px;
    }

    .lead-magnet-container {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .books-grid {
        grid-template-columns: 1fr;
    }

    .pricing-cards {
        grid-template-columns: 1fr;
    }

    .breach-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
    }

    .book-hero .hero-buttons {
        flex-direction: column;
    }

    .book-hero .hero-buttons .btn {
        width: 100%;
        text-align: center;
    }

    .comparison-table-wrapper {
        margin: 20px -20px 0;
        padding: 0 20px;
    }
}

@media (max-width: 480px) {
    .benefits-grid,
    .channels-grid,
    .resources-grid,
    .topics-grid,
    .preview-grid,
    .checklist-categories {
        grid-template-columns: 1fr;
    }
}