:root {
    /* Color Palette - Modern Yellow & Grey Scheme */
    --bg-primary: #F2F2F2; /* Very light grey */
    --bg-secondary: #FFFFFF; /* White for contrast */
    --bg-dark: #0A0A0A; /* Rich black for dark sections */
    
    --text-primary: #000000; /* Headings: Black */
    --text-body: #333333; /* Body: Dark grey */
    --text-on-dark: #FFFFFF; /* Text on black sections */
    
    --accent-primary: #FFD200; /* Warm modern yellow */
    --accent-hover: #E6BD00; /* Slightly darker yellow for hover */
    --accent-soft: rgba(255, 210, 0, 0.1);
    
    --border-subtle: #E0E0E0; /* Subtle grey lines */
    --white: #FFFFFF;

    /* Typography remains the same */
    --font-heading: 'Playfair Display', serif;
    --font-body: 'Inter', sans-serif;

    /* Spacing & Sizing */
    --container-width: 1200px;
    --section-padding: 100px 0;
    --border-radius: 4px; /* Slightly sharper for professional feel */
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);

    /* Shadows */
    --shadow-subtle: 0 4px 15px rgba(0, 0, 0, 0.04);
    --shadow-hover: 0 10px 30px rgba(0, 0, 0, 0.08);
}

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

html {
    scroll-behavior: smooth;
}

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

h1, h2, h3, h4 {
    color: var(--text-primary);
}

h1,
h2,
h3,
h4 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-smooth);
}

ul {
    list-style: none;
}

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

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition-smooth);
}

.navbar.scrolled {
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    border-bottom: 1px solid var(--border-subtle);
}

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

.logo {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 900;
    letter-spacing: -1px;
}

.logo span {
    color: var(--accent-primary);
    font-weight: 300;
    font-style: italic;
}

.nav-links {
    display: flex;
    gap: 40px;
}

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

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 14px 32px;
    font-weight: 500;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.95rem;
    transition: var(--transition-smooth);
    border: none;
}

.btn-primary {
    background-color: var(--accent-primary);
    color: var(--text-primary);
    border: 1px solid var(--accent-primary);
    font-weight: 600;
}

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

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

.btn-outline:hover {
    background-color: var(--text-primary);
    color: var(--white);
    transform: translateY(-2px);
}

.btn-text {
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--text-primary);
    border-bottom: 2px solid var(--accent-primary);
    padding-bottom: 2px;
}

.btn-text:hover {
    color: var(--accent-hover);
    border-bottom-color: var(--accent-hover);
}

.badge {
    display: inline-block;
    padding: 6px 16px;
    background-color: var(--accent-primary);
    color: var(--text-primary);
    border-radius: 2px;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 24px;
}

/* Sections */
section {
    padding: var(--section-padding);
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.section-header p {
    color: var(--text-body);
}

.section-footer {
    text-align: center;
    margin-top: 60px;
}

/* Hero */
.hero {
    padding-top: 180px;
    padding-bottom: 100px;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 80px;
}

.hero-content h1 {
    font-size: 4.5rem;
    margin-bottom: 24px;
}

.hero-content .lead {
    font-size: 1.25rem;
    color: var(--text-body);
    margin-bottom: 40px;
    max-width: 500px;
}

.hero-btns {
    display: flex;
    gap: 20px;
}

.hero-image .image-wrapper {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-hover);
}

.hero-image img {
    width: 100%;
    height: 500px;
    object-fit: cover;
    transition: var(--transition-smooth);
}

/* Product Cards */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 40px;
}

.product-card {
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition-smooth);
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-subtle);
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.product-image {
    height: 280px;
    overflow: hidden;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-smooth);
}

.product-card:hover .product-image img {
    transform: scale(1.05);
}

.product-details {
    padding: 30px;
}

.product-details h3 {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.product-details p {
    color: var(--text-body);
    font-size: 0.95rem;
    margin-bottom: 24px;
}

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

.product-footer .price {
    font-weight: 700;
    font-size: 1.2rem;
}

/* About Section */
.about {
    background-color: var(--bg-secondary);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 100px;
    align-items: center;
}

.about-image img {
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-hover);
}

.about-content h2 {
    font-size: 3rem;
    margin-bottom: 30px;
}

.about-content p {
    margin-bottom: 20px;
    color: var(--text-body);
}

.about-stats {
    display: flex;
    gap: 60px;
    margin-top: 40px;
}

.stat span {
    display: block;
    font-size: 2.5rem;
    font-family: var(--font-heading);
    font-weight: 900;
    color: var(--accent-primary);
}

.stat p {
    font-size: 0.9rem;
    margin-bottom: 0;
}

/* Testimonials */
.testimonials {
    background-color: var(--white);
}

.testimonial-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.testimonial-card {
    padding: 40px;
    background-color: var(--bg-primary);
    border-radius: var(--border-radius);
    position: relative;
}

.testimonial-card::before {
    content: '“';
    position: absolute;
    top: 20px;
    left: 20px;
    font-size: 4rem;
    font-family: var(--font-heading);
    color: rgba(197, 160, 89, 0.1);
}

.testimonial-card p {
    font-size: 1.1rem;
    font-style: italic;
    margin-bottom: 30px;
    position: relative;
    color: var(--text-body);
}

.testimonial-user strong {
    display: block;
    font-size: 1rem;
    color: var(--text-primary);
}

.testimonial-user span {
    font-size: 0.85rem;
    color: var(--text-body);
    opacity: 0.8;
}

/* CTA */
.cta-card {
    background-color: var(--bg-dark);
    color: var(--text-on-dark);
    padding: 80px;
    border-radius: var(--border-radius);
    text-align: center;
}

.cta-card h2 {
    font-size: 3.5rem;
    margin-bottom: 20px;
}

.cta-card p {
    font-size: 1.2rem;
    margin-bottom: 40px;
    opacity: 0.8;
}

/* Product Detail Page */
.product-page {
    padding-top: 180px;
    padding-bottom: 100px;
}

.product-grid-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 100px;
    align-items: start;
}

.product-visual img {
    width: 100%;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-hover);
}

.product-info-detail h1 {
    font-size: 3.5rem;
    margin-bottom: 10px;
}

.product-price-detail {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 30px;
}

.product-info-detail .description {
    font-size: 1.1rem;
    color: var(--text-body);
    margin-bottom: 40px;
}

.what-learned,
.who-it-is-for {
    margin-bottom: 40px;
}

.what-learned h3,
.who-it-is-for h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.what-learned ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.what-learned li {
    position: relative;
    padding-left: 28px;
    color: var(--text-body);
}

.what-learned li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-weight: 900;
}

.payment-section {
    padding-top: 30px;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

.btn-full {
    width: 100%;
    text-align: center;
    font-size: 1.1rem;
    padding: 18px;
    margin-bottom: 20px;
}

.payment-badges {
    display: flex;
    gap: 24px;
    justify-content: center;
}

.badge-icon {
    font-size: 0.85rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}

.guarantee {
    margin-top: 50px;
    background-color: var(--bg-secondary);
    padding: 30px;
    border-radius: var(--border-radius);
    border: 1px dashed var(--border-subtle);
}

.guarantee p {
    margin-bottom: 10px;
}

.guarantee .muted {
    font-size: 0.9rem;
    opacity: 0.7;
}

@media (max-width: 900px) {
    .product-grid-detail {
        grid-template-columns: 1fr;
        gap: 60px;
    }
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-info p {
    margin-top: 20px;
    color: var(--text-body);
    max-width: 300px;
}

.footer-links h3,
.footer-contact h3 {
    font-size: 1.2rem;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    color: var(--text-body);
}

.footer-links a:hover {
    color: var(--text-primary);
    text-decoration: underline;
    text-decoration-color: var(--accent-primary);
}

.footer-contact p {
    color: var(--text-body);
}

.footer-contact a:hover {
    color: var(--text-primary);
    text-decoration: underline;
    text-decoration-color: var(--accent-primary);
}

.social-links {
    display: flex;
    gap: 20px;
    margin-top: 24px;
}

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-muted);
}

@media (max-width: 1024px) {
    .hero-content h1 {
        font-size: 3.5rem;
    }

    .hero-grid,
    .about-grid {
        gap: 40px;
    }
}

@media (max-width: 768px) {
    section {
        padding: 60px 0;
    }

    .nav-links,
    .navbar .btn {
        display: none;
    }

    .hero-grid,
    .about-grid,
    .testimonial-grid {
        grid-template-columns: 1fr;
    }

    .hero-content {
        text-align: center;
        order: 2;
    }

    .hero-content .lead {
        margin: 0 auto 40px;
    }

    .hero-btns {
        justify-content: center;
    }

    .hero-image {
        order: 1;
    }

    .hero-content h1 {
        font-size: 2.8rem;
    }

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

    .about-stats {
        justify-content: center;
    }

    .cta-card {
        padding: 40px 20px;
    }

    .cta-card h2 {
        font-size: 2.2rem;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}