/* ===== CSS Variables ===== */
:root {
    --primary-color: #2C3E50;
    --secondary-color: #34495E;
    --accent-color: #3498DB;
    --text-dark: #1A1A1A;
    --text-light: #6B7280;
    --bg-light: #F8FAFC;
    --bg-white: #FFFFFF;
    --border-color: #E5E7EB;
    --success-color: #10B981;
    --warning-color: #F59E0B;

    --font-display: 'Playfair Display', serif;
    --font-body: 'Inter', sans-serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    --border-radius: 12px;
    --transition: all 0.3s ease;
}

/* ===== Reset & Base Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    color: var(--text-dark);
    line-height: 1.7;
    background-color: var(--bg-white);
}

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

/* ===== Typography ===== */
h1,
h2,
h3,
h4 {
    font-family: var(--font-display);
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

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

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 600;
}

h3 {
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    font-weight: 600;
}

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

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

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-color), #2980B9);
    color: var(--bg-white);
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

.btn-large {
    padding: 1.25rem 3rem;
    font-size: 1.125rem;
}

.btn-disabled {
    background: #D1D5DB;
    color: #9CA3AF;
    cursor: not-allowed;
}

.btn-disabled:hover {
    transform: none;
    box-shadow: none;
}

/* ===== Section Titles ===== */
.section-title {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    text-align: center;
    color: var(--text-light);
    font-size: 1.125rem;
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
}

/* ===== Hero Section ===== */
.hero {
    background: linear-gradient(135deg, #EBF4F8 0%, #F8FAFC 100%);
    padding: var(--spacing-xl) 0;
    min-height: 90vh;
    display: flex;
    align-items: center;
}

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

.hero-title {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
}

.social-proof {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-white);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
}

.stars {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
    color: #F59E0B;
}

.proof-text {
    font-size: 0.95rem;
    color: var(--text-light);
    margin: 0;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.book-mockup {
    max-width: 100%;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.15));
    animation: float 6s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-20px);
    }
}

/* ===== Learn Section ===== */
.learn-section {
    padding: var(--spacing-xl) 0;
    background: var(--bg-white);
}

.learn-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.learn-card {
    padding: var(--spacing-md);
    background: var(--bg-light);
    border-radius: var(--border-radius);
    border: 2px solid transparent;
    transition: var(--transition);
}

.learn-card:hover {
    border-color: var(--accent-color);
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.learn-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.learn-card h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.learn-card p {
    color: var(--text-light);
    margin: 0;
}

/* ===== Purpose Section ===== */
.purpose-section {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, #EBF4F8 0%, #F8FAFC 100%);
}

.purpose-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.purpose-card {
    padding: var(--spacing-md);
    background: var(--bg-white);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    transition: var(--transition);
}

.purpose-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.purpose-card h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.purpose-card p {
    color: var(--text-light);
    margin: 0;
}

/* ===== Structure Section ===== */
.structure-section {
    padding: var(--spacing-xl) 0;
    background: var(--bg-white);
}

.chapters {
    max-width: 900px;
    margin: 0 auto;
}

.chapter {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    background: var(--bg-light);
    border-left: 4px solid var(--accent-color);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.chapter:hover {
    background: var(--bg-white);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.chapter h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.chapter p {
    color: var(--text-light);
    margin: 0;
}

/* ===== Author Section ===== */
.author-section {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, #2C3E50 0%, #34495E 100%);
    color: var(--bg-white);
}

.author-section .section-title {
    color: var(--bg-white);
}

.author-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-lg);
    align-items: center;
    max-width: 900px;
    margin: 0 auto;
}

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

.author-photo {
    width: 250px;
    height: 250px;
    object-fit: cover;
    border-radius: 50%;
    border: 5px solid var(--bg-white);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.author-text p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.1rem;
}

.author-signature {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-style: italic;
    margin-top: var(--spacing-md);
    color: var(--bg-white);
}

/* ===== Testimonials Section ===== */
.testimonials-section {
    padding: var(--spacing-xl) 0;
    background: var(--bg-white);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-md);
}

.testimonial {
    padding: var(--spacing-md);
    background: var(--bg-light);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.testimonial:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
    transform: translateY(-5px);
}

.testimonial-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.testimonial-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-color), #2980B9);
    color: var(--bg-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.125rem;
}

.testimonial-info h4 {
    margin: 0;
    color: var(--primary-color);
    font-size: 1rem;
}

.testimonial-info p {
    margin: 0;
    font-size: 0.875rem;
    color: var(--text-light);
}

.testimonial .stars {
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
}

.testimonial p:last-child {
    color: var(--text-light);
    font-style: italic;
    margin: 0;
}

/* ===== Pricing Section ===== */
.pricing-section {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, #EBF4F8 0%, #F8FAFC 100%);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
}

.pricing-card {
    padding: var(--spacing-lg);
    background: var(--bg-white);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    text-align: center;
    transition: var(--transition);
    position: relative;
}

.pricing-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}

.pricing-card.unavailable {
    opacity: 0.7;
}

.unavailable-badge {
    position: absolute;
    top: -15px;
    right: 20px;
    background: var(--warning-color);
    color: var(--bg-white);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
}

.pricing-card h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.price-container {
    margin-bottom: var(--spacing-md);
}

.old-price {
    font-size: 1.5rem;
    font-weight: 600;
    color: #DC2626;
    text-decoration: line-through;
    text-decoration-color: #DC2626;
    text-decoration-thickness: 2px;
    font-family: var(--font-display);
    margin-bottom: 0.25rem;
}

.price {
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: var(--spacing-md);
    font-family: var(--font-display);
}


.features {
    list-style: none;
    margin-bottom: var(--spacing-md);
    text-align: left;
}

.features li {
    padding: var(--spacing-xs) 0;
    color: var(--text-light);
    border-bottom: 1px solid var(--border-color);
}

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

/* Stripe Button Wrapper */
.stripe-button-wrapper {
    margin-top: var(--spacing-md);
    display: flex;
    justify-content: center;
    align-items: center;
}

.stripe-button-wrapper stripe-buy-button {
    width: 100%;
    max-width: 100%;
}


/* ===== Guarantee Section ===== */
.guarantee-section {
    padding: var(--spacing-xl) 0;
    background: var(--bg-white);
    text-align: center;
}

.guarantee-text {
    max-width: 800px;
    margin: 0 auto var(--spacing-md);
    font-size: 1.125rem;
    color: var(--text-light);
}

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

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    background: var(--bg-white);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--accent-color);
    transition: var(--transition);
}

.faq-item:hover {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.faq-item h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    font-size: 1.125rem;
}

.faq-item p {
    color: var(--text-light);
    margin: 0;
}

/* ===== Final CTA Section ===== */
.final-cta {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--bg-white);
    text-align: center;
}

.final-cta .section-title {
    color: var(--bg-white);
}

.cta-text {
    font-size: 1.25rem;
    max-width: 700px;
    margin: 0 auto var(--spacing-sm);
    color: rgba(255, 255, 255, 0.95);
}

.final-cta .btn {
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.ps-section {
    max-width: 700px;
    margin: var(--spacing-lg) auto 0;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    color: rgba(255, 255, 255, 0.9);
}

.ps-section p {
    margin-bottom: var(--spacing-xs);
}

.ps-section strong {
    color: var(--bg-white);
}

/* ===== Footer ===== */
.footer {
    padding: var(--spacing-lg) 0;
    background: var(--text-dark);
    color: var(--bg-white);
    text-align: center;
}

.footer-links {
    margin-top: var(--spacing-md);
}

.footer-links p {
    margin-bottom: var(--spacing-xs);
    color: rgba(255, 255, 255, 0.8);
}

/* ===== Back to Top Button ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--accent-color), #2980B9);
    color: var(--bg-white);
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

@media (max-width: 768px) {
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: 1.25rem;
    }
}


/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
        width: 100%;
        overflow-x: hidden;
        /* Prevent horizontal scroll */
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-image {
        order: -1;
        padding: var(--spacing-md) 0;
        width: 100%;
    }

    .book-mockup {
        max-width: 60%;
        width: 60%;
        height: auto;
        margin: 0 auto;
    }

    .author-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .pricing-section {
        padding: var(--spacing-md) 0;
    }

    .pricing-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
        padding: 0;
    }

    .pricing-card {
        padding: var(--spacing-lg) var(--spacing-md);
        margin: 0 auto;
        max-width: 100%;
        width: 100%;
    }

    .pricing-card h3 {
        font-size: 1.5rem;
        margin-bottom: var(--spacing-sm);
    }

    .price-container {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        text-align: center;
        margin-bottom: var(--spacing-sm);
    }

    .old-price {
        text-align: center;
        width: 100%;
        font-size: 1.25rem;
        margin-bottom: 0.5rem;
    }

    .price {
        text-align: center;
        width: 100%;
        font-size: 2.5rem;
        margin-bottom: var(--spacing-sm);
    }

    .features {
        margin-bottom: var(--spacing-sm);
        padding: 0;
    }

    .features li {
        padding: 0.75rem 0;
        font-size: 0.95rem;
    }

    .stripe-button-wrapper {
        margin-top: var(--spacing-sm);
        width: 100%;
    }

    .btn {
        width: 100%;
        padding: 1rem 1.5rem;
        font-size: 0.95rem;
    }

    .unavailable-badge {
        top: -10px;
        right: 10px;
        font-size: 0.75rem;
        padding: 0.4rem 0.8rem;
    }

    .learn-grid,
    .purpose-grid,
    .testimonials-grid,
    .pricing-grid {
        grid-template-columns: 1fr;
        width: 100%;
        margin: 0 auto;
    }

    .learn-card {
        padding: var(--spacing-lg) var(--spacing-md);
    }

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

    .learn-card,
    .purpose-card,
    .chapter,
    .testimonial {
        width: 100%;
        margin: 0 auto var(--spacing-md);
        box-sizing: border-box;
        /* Ensure padding doesn't add to width */
    }

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

    .section-title {
        font-size: 1.75rem;
    }

    .section-subtitle {
        font-size: 1rem;
    }
}

/* ===== Smooth Animations ===== */
@media (prefers-reduced-motion: no-preference) {

    .learn-card,
    .purpose-card,
    .chapter,
    .testimonial,
    .pricing-card,
    .faq-item {
        animation: fadeInUp 0.6s ease-out;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}