/* ==========================================
   VIGOR BOOST - MODERN GRADIENT DESIGN
   Mobile-First Responsive CSS
   ========================================== */

/* ==========================================
   ROOT VARIABLES & RESET
   ========================================== */
:root {
    --primary-gradient: linear-gradient(135deg, #4F46E5 0%, #06B6D4 100%);
    --primary-color: #4F46E5;
    --secondary-color: #06B6D4;
    --accent-color: #10B981;
    --dark-color: #1F2937;
    --light-color: #F9FAFB;
    --white: #FFFFFF;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(79, 70, 229, 0.2);
    --shadow-xl: 0 20px 50px rgba(79, 70, 229, 0.3);
    --border-radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background: var(--light-color);
    overflow-x: hidden;
}

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

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

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

input, select, textarea {
    font-size: 16px;
}

/* ==========================================
   CONTAINER
   ========================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ==========================================
   TYPOGRAPHY
   ========================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: 28px;
}

h2 {
    font-size: 24px;
}

h3 {
    font-size: 20px;
}

p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

/* ==========================================
   BUTTONS
   ========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    min-height: 48px;
    font-size: 16px;
    font-weight: 600;
    border-radius: var(--border-radius);
    transition: var(--transition);
    cursor: pointer;
    text-align: center;
    white-space: nowrap;
}

.btn-primary {
    background: var(--primary-gradient);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover,
.btn-primary:focus {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-hero {
    background: var(--primary-gradient);
    color: var(--white);
    padding: 16px 32px;
    font-size: 18px;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
}

.btn-pricing {
    background: var(--primary-gradient);
    color: var(--white);
    width: 100%;
    padding: 16px;
    font-size: 18px;
    box-shadow: var(--shadow-md);
}

.btn-final {
    background: var(--primary-gradient);
    color: var(--white);
    padding: 18px 40px;
    font-size: 20px;
    box-shadow: var(--shadow-xl);
}

/* ==========================================
   HEADER & NAVIGATION
   ========================================== */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.navbar {
    padding: 12px 0;
}

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

.logo h2 {
    font-size: 24px;
    margin: 0;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo span {
    font-weight: 400;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 24px;
}

.nav-links {
    display: none;
    list-style: none;
    gap: 24px;
}

.nav-links li a {
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

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

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

.nav-cta {
    padding: 10px 24px;
    min-height: 40px;
    font-size: 14px;
}

/* Hamburger Menu */
.hamburger {
    display: flex;
    flex-direction: column;
    gap: 4px;
    width: 30px;
    height: 24px;
    cursor: pointer;
    z-index: 1001;
}

.hamburger span {
    width: 100%;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
    transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Mobile Menu */
@media (max-width: 767px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        align-items: flex-start;
        padding: 80px 30px 30px;
        box-shadow: var(--shadow-xl);
        transition: var(--transition);
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-links {
        display: flex;
        flex-direction: column;
        width: 100%;
        gap: 16px;
    }
    
    .nav-links li {
        width: 100%;
    }
    
    .nav-links li a {
        display: block;
        padding: 12px 0;
        font-size: 18px;
    }
    
    .nav-cta {
        width: 100%;
        margin-top: 20px;
    }
}

/* ==========================================
   HERO SECTION
   ========================================== */
.hero {
    padding: 60px 0;
    background: linear-gradient(135deg, #F0F9FF 0%, #E0F2FE 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(79, 70, 229, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

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

.hero-content {
    display: flex;
    flex-direction: column;
    gap: 40px;
    align-items: center;
}

.hero-image {
    width: 100%;
    max-width: 400px;
}

.floating-product {
    animation: productFloat 4s ease-in-out infinite;
}

@keyframes productFloat {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    25% { transform: translateY(-10px) rotate(2deg); }
    50% { transform: translateY(-20px) rotate(0deg); }
    75% { transform: translateY(-10px) rotate(-2deg); }
}

.hero-text {
    text-align: center;
}

.hero-title {
    font-size: 32px;
    margin-bottom: 20px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    margin-bottom: 30px;
    font-size: 16px;
    color: #4B5563;
}

.btn-hero {
    margin: 0 auto;
}

/* ==========================================
   WHY CHOOSE US
   ========================================== */
.why-choose {
    padding: 60px 0;
    background: var(--white);
}

.section-title {
    text-align: center;
    font-size: 32px;
    margin-bottom: 40px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

.feature-card {
    background: var(--white);
    padding: 30px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 2px solid transparent;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--secondary-color);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
}

.feature-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--primary-color);
}

.feature-card p {
    font-size: 14px;
    color: #6B7280;
    margin: 0;
}

/* ==========================================
   WHAT IS SECTION
   ========================================== */
.what-is {
    padding: 60px 0;
    background: linear-gradient(135deg, #F0F9FF 0%, #E0F2FE 100%);
}

.what-is-content {
    display: flex;
    flex-direction: column;
    gap: 40px;
    align-items: center;
}

.what-is-text {
    order: 2;
}

.what-is-image {
    order: 1;
    width: 100%;
    max-width: 400px;
}

.what-is-image img {
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
}

/* ==========================================
   HOW IT WORKS
   ========================================== */
.how-it-works {
    padding: 60px 0;
    background: var(--white);
}

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

.accordion-item {
    background: var(--white);
    border-radius: var(--border-radius);
    margin-bottom: 16px;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    border: 2px solid #E5E7EB;
    transition: var(--transition);
}

.accordion-item:hover {
    border-color: var(--secondary-color);
}

.accordion-header {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px;
    min-height: 44px;
    font-size: 18px;
    font-weight: 600;
    color: var(--dark-color);
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
}

.accordion-header:hover {
    background: #F9FAFB;
}

.accordion-icon {
    flex-shrink: 0;
    transition: var(--transition);
}

.accordion-item.active .accordion-icon {
    transform: rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.accordion-item.active .accordion-content {
    max-height: 500px;
}

.accordion-content p {
    padding: 0 20px 20px;
    color: #4B5563;
    line-height: 1.8;
}

/* ==========================================
   REVIEWS SECTION
   ========================================== */
.reviews {
    padding: 60px 0;
    background: linear-gradient(135deg, #F0F9FF 0%, #E0F2FE 100%);
}

.reviews-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

.review-card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    animation: slideInUp 0.6s ease-out;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.review-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.review-image {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    border-radius: 50%;
    overflow: hidden;
    border: 3px solid var(--secondary-color);
}

.review-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

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

.review-stars {
    color: #F59E0B;
    font-size: 20px;
    margin-bottom: 12px;
}

.review-text {
    font-size: 15px;
    color: #4B5563;
    font-style: italic;
    margin-bottom: 16px;
    line-height: 1.7;
}

.review-author strong {
    display: block;
    font-size: 16px;
    color: var(--primary-color);
    margin-bottom: 4px;
}

.review-author span {
    font-size: 14px;
    color: #6B7280;
}

/* ==========================================
   PRICING SECTION
   ========================================== */
.pricing {
    padding: 60px 0;
    background: var(--white);
}

.section-subtitle {
    text-align: center;
    font-size: 18px;
    color: #6B7280;
    margin-bottom: 30px;
}

.countdown-timer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
    padding: 20px;
    background: linear-gradient(135deg, #FEE2E2 0%, #FECACA 100%);
    border-radius: var(--border-radius);
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.timer-box {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.timer-digit {
    font-size: 36px;
    font-weight: 700;
    color: #DC2626;
    background: var(--white);
    padding: 12px 20px;
    border-radius: 12px;
    min-width: 80px;
    text-align: center;
    box-shadow: var(--shadow-md);
}

.timer-label {
    font-size: 12px;
    font-weight: 600;
    color: #991B1B;
    margin-top: 8px;
    text-transform: uppercase;
}

.timer-separator {
    font-size: 36px;
    font-weight: 700;
    color: #DC2626;
}

.pricing-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    margin-bottom: 40px;
}

.pricing-card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 30px;
    text-align: center;
    box-shadow: var(--shadow-md);
    border: 3px solid #E5E7EB;
    position: relative;
    transition: var(--transition);
}

.pricing-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
    border-color: var(--secondary-color);
    background: linear-gradient(135deg, #F0F9FF 0%, #E0F2FE 100%);
    transform: scale(1.02);
}

.popular-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-gradient);
    color: var(--white);
    padding: 8px 24px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    box-shadow: var(--shadow-md);
}

.pricing-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-color);
    text-transform: uppercase;
    margin-bottom: 8px;
}

.pricing-title {
    font-size: 24px;
    margin-bottom: 8px;
}

.pricing-supply {
    font-size: 14px;
    color: #6B7280;
    margin-bottom: 20px;
}

.pricing-image {
    margin: 20px 0;
}

.pricing-image img {
    max-width: 200px;
    margin: 0 auto;
}

.pricing-price {
    margin: 20px 0;
}

.price-per {
    display: block;
    font-size: 48px;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
}

.price-label {
    font-size: 14px;
    color: #6B7280;
}

.pricing-total {
    margin: 20px 0;
}

.price-old {
    font-size: 20px;
    color: #9CA3AF;
    text-decoration: line-through;
    margin-right: 8px;
}

.price-new {
    font-size: 32px;
    font-weight: 700;
    color: #10B981;
}

.pricing-badges {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin: 16px 0;
}

.badge {
    background: #10B981;
    color: var(--white);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

.btn-pricing {
    margin: 20px 0;
}

.payment-logos {
    margin-top: 20px;
}

.payment-logos img {
    max-width: 200px;
    margin: 0 auto;
}

.rating-image {
    text-align: center;
    margin-top: 20px;
}

.rating-image img {
    max-width: 300px;
    margin: 0 auto;
}

/* ==========================================
   INGREDIENTS SECTION
   ========================================== */
.ingredients {
    padding: 60px 0;
    background: linear-gradient(135deg, #F0F9FF 0%, #E0F2FE 100%);
}

.ingredients-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.ingredient-card {
    background: var(--white);
    padding: 24px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border-left: 4px solid var(--secondary-color);
}

.ingredient-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(5px);
}

.ingredient-card h3 {
    color: var(--primary-color);
    font-size: 18px;
    margin-bottom: 12px;
}

.ingredient-card p {
    font-size: 14px;
    color: #4B5563;
    line-height: 1.7;
    margin: 0;
}

/* ==========================================
   SCIENTIFIC EVIDENCE
   ========================================== */
.scientific-evidence {
    padding: 60px 0;
    background: var(--white);
}

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

.evidence-section {
    background: #F9FAFB;
    padding: 24px;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    border-left: 4px solid var(--primary-color);
}

.evidence-section h3 {
    color: var(--primary-color);
    font-size: 20px;
    margin-bottom: 12px;
}

.evidence-section p {
    font-size: 14px;
    color: #4B5563;
    line-height: 1.8;
    margin: 0;
}

/* ==========================================
   GUARANTEE SECTION
   ========================================== */
.guarantee {
    padding: 60px 0;
    background: linear-gradient(135deg, #F0F9FF 0%, #E0F2FE 100%);
}

.guarantee-content {
    display: flex;
    flex-direction: column;
    gap: 40px;
    align-items: center;
}

.guarantee-image {
    width: 100%;
    max-width: 300px;
}

.guarantee-image img {
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
}

.guarantee-text {
    order: 2;
}

.guarantee-item {
    margin-bottom: 30px;
}

.guarantee-item:last-child {
    margin-bottom: 0;
}

.guarantee-item h3 {
    font-size: 20px;
    color: var(--primary-color);
    margin-bottom: 12px;
}

.guarantee-item p {
    font-size: 15px;
    color: #4B5563;
    line-height: 1.8;
}

/* ==========================================
   BENEFITS SECTION
   ========================================== */
.benefits {
    padding: 60px 0;
    background: var(--white);
}

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

.benefit-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    background: #F9FAFB;
    padding: 20px;
    border-radius: var(--border-radius);
    margin-bottom: 16px;
    transition: var(--transition);
}

.benefit-item:hover {
    background: var(--white);
    box-shadow: var(--shadow-md);
    transform: translateX(5px);
}

.checkmark {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    color: #10B981;
    background: #D1FAE5;
    border-radius: 50%;
    padding: 4px;
}

.benefit-item h3 {
    font-size: 18px;
    color: var(--primary-color);
    margin-bottom: 6px;
}

.benefit-item p {
    font-size: 14px;
    color: #6B7280;
    margin: 0;
}

/* ==========================================
   FAQ SECTION
   ========================================== */
.faq {
    padding: 60px 0;
    background: linear-gradient(135deg, #F0F9FF 0%, #E0F2FE 100%);
}

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

.faq-item {
    background: var(--white);
    border-radius: var(--border-radius);
    margin-bottom: 16px;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    border: 2px solid #E5E7EB;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--secondary-color);
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px;
    min-height: 44px;
    font-size: 16px;
    font-weight: 600;
    color: var(--dark-color);
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
}

.faq-question:hover {
    background: #F9FAFB;
}

.faq-icon {
    flex-shrink: 0;
    transition: var(--transition);
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 20px 20px;
    color: #4B5563;
    line-height: 1.8;
    font-size: 14px;
}

/* ==========================================
   FINAL CTA SECTION
   ========================================== */
.final-cta {
    padding: 60px 0;
    background: var(--white);
}

.final-cta-content {
    display: flex;
    flex-direction: column;
    gap: 40px;
    align-items: center;
    text-align: center;
}

.final-cta-image {
    width: 100%;
    max-width: 400px;
    animation: productFloat 4s ease-in-out infinite;
}

.final-cta-text h2 {
    font-size: 28px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 30px;
}

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

.final-price-old {
    font-size: 18px;
    color: #9CA3AF;
    text-decoration: line-through;
}

.final-price-new {
    font-size: 36px;
    font-weight: 700;
    color: #10B981;
}

.btn-final {
    width: 100%;
    max-width: 500px;
}

/* ==========================================
   FOOTER
   ========================================== */
.footer {
    background: #1F2937;
    color: var(--white);
    padding: 40px 0 20px;
}

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

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 24px;
}

.footer-links a {
    color: var(--white);
    font-size: 14px;
    transition: var(--transition);
}

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

.footer-disclaimer {
    margin-bottom: 24px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius);
}

.footer-disclaimer p {
    font-size: 12px;
    color: #D1D5DB;
    line-height: 1.6;
    margin: 0;
}

.footer-social {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 20px;
}

.footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--primary-gradient);
    transform: translateY(-3px);
}

.footer-copyright {
    font-size: 14px;
    color: #9CA3AF;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* ==========================================
   PURCHASE NOTIFICATION
   ========================================== */
.purchase-notification {
    position: fixed;
    bottom: -100px;
    left: 20px;
    background: var(--white);
    padding: 16px 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-xl);
    max-width: 320px;
    z-index: 999;
    transition: var(--transition);
    border-left: 4px solid #10B981;
}

.purchase-notification.show {
    bottom: 20px;
}

.notification-content {
    display: flex;
    gap: 12px;
    align-items: center;
}

.notification-icon {
    font-size: 24px;
}

.notification-text strong {
    color: var(--primary-color);
    display: block;
}

.notification-text p {
    font-size: 14px;
    color: #6B7280;
    margin: 0;
}

/* ==========================================
   SCROLL TO TOP BUTTON
   ========================================== */
.scroll-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 56px;
    height: 56px;
    background: var(--primary-gradient);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 998;
}

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

.scroll-to-top:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.scroll-to-top:active {
    transform: scale(0.95);
}

/* ==========================================
   TABLET BREAKPOINT (576px)
   ========================================== */
@media (min-width: 576px) {
    .container {
        padding: 0 30px;
    }
    
    h1 {
        font-size: 36px;
    }
    
    h2 {
        font-size: 28px;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .pricing-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .ingredients-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-links {
        flex-direction: row;
        justify-content: center;
        gap: 30px;
    }
}

/* ==========================================
   TABLET BREAKPOINT (768px)
   ========================================== */
@media (min-width: 768px) {
    h1 {
        font-size: 40px;
    }
    
    h2 {
        font-size: 32px;
    }
    
    .section-title {
        font-size: 36px;
    }
    
    .nav-links {
        display: flex;
    }
    
    .hamburger {
        display: none;
    }
    
    .hero {
        padding: 80px 0;
    }
    
    .hero-content {
        flex-direction: row;
        align-items: center;
    }
    
    .hero-image {
        flex: 1;
    }
    
    .hero-text {
        flex: 1;
        text-align: left;
    }
    
    .hero-title {
        font-size: 48px;
    }
    
    .hero-description {
        font-size: 18px;
    }
    
    .btn-hero {
        margin: 0;
    }
    
    .what-is-content {
        flex-direction: row;
        align-items: center;
    }
    
    .what-is-text {
        flex: 1;
        order: 1;
    }
    
    .what-is-image {
        flex: 1;
        order: 2;
    }
    
    .guarantee-content {
        flex-direction: row;
        align-items: center;
    }
    
    .guarantee-image {
        flex: 1;
    }
    
    .guarantee-text {
        flex: 1;
        order: 2;
    }
    
    .final-cta-content {
        flex-direction: row;
        text-align: left;
    }
    
    .final-cta-text {
        flex: 1;
    }
    
    .final-cta-image {
        flex: 1;
    }
    
    .final-pricing {
        align-items: flex-start;
    }
    
    .btn-final {
        margin: 0;
    }
}

/* ==========================================
   DESKTOP BREAKPOINT (992px)
   ========================================== */
@media (min-width: 992px) {
    .container {
        padding: 0 40px;
    }
    
    .features-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .reviews-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .pricing-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .accordion-header {
        font-size: 20px;
    }
    
    .faq-question {
        font-size: 18px;
    }
    
    .timer-digit {
        font-size: 48px;
        min-width: 100px;
    }
}

/* ==========================================
   LARGE DESKTOP BREAKPOINT (1440px)
   ========================================== */
@media (min-width: 1440px) {
    .hero {
        padding: 100px 0;
    }
    
    .hero-title {
        font-size: 56px;
    }
    
    .section-title {
        font-size: 42px;
    }
}

/* ==========================================
   REDUCED MOTION
   ========================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ==========================================
   PRINT STYLES
   ========================================== */
@media print {
    .header,
    .purchase-notification,
    .scroll-to-top {
        display: none !important;
    }
}