/* ===================================
   ALPHAFUEL PRO - BOLD & ENERGETIC DESIGN
   Mobile-First Responsive CSS
   =================================== */

/* === ROOT VARIABLES === */
:root {
    --primary-color: #EF4444;
    --secondary-color: #F59E0B;
    --accent-color: #10B981;
    --dark-color: #1F2937;
    --light-color: #F9FAFB;
    --white: #FFFFFF;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* === BASE RESET === */
* {
    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: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background: var(--white);
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

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

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

/* === SECTION === */
.section {
    padding: 60px 0;
}

.section-title {
    font-size: 32px;
    font-weight: 800;
    text-align: center;
    margin-bottom: 15px;
    color: var(--dark-color);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    text-align: center;
    font-size: 18px;
    color: #6B7280;
    margin-bottom: 40px;
}

/* === HEADER & NAVIGATION === */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: var(--transition);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.nav-logo {
    font-size: 24px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-list {
    display: flex;
    gap: 25px;
}

.nav-link {
    font-weight: 600;
    color: var(--dark-color);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s;
}

.nav-link:hover::after {
    width: 100%;
}

.nav-cta {
    padding: 10px 25px;
    min-height: 48px;
    display: flex;
    align-items: center;
}

/* Mobile Navigation Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 10px;
    min-width: 44px;
    min-height: 44px;
    justify-content: center;
    align-items: center;
}

.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
    content: '';
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 3px;
    transition: var(--transition);
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
    position: absolute;
}

.nav-toggle-icon::before {
    transform: translateY(-8px);
}

.nav-toggle-icon::after {
    transform: translateY(8px);
}

/* === BUTTONS === */
.btn {
    display: inline-block;
    padding: 15px 35px;
    min-height: 48px;
    font-weight: 700;
    font-size: 16px;
    text-align: center;
    border-radius: 50px;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 25px rgba(239, 68, 68, 0.4);
}

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

.btn-hero {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 18px 45px;
    font-size: 18px;
    box-shadow: 0 6px 20px rgba(239, 68, 68, 0.3);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 6px 20px rgba(239, 68, 68, 0.3);
    }
    50% {
        box-shadow: 0 6px 30px rgba(239, 68, 68, 0.5);
    }
}

.btn-hero:hover {
    transform: translateY(-3px) scale(1.02);
}

.btn-pricing {
    background: linear-gradient(135deg, var(--accent-color), #059669);
    color: var(--white);
    width: 100%;
    padding: 15px;
    font-size: 18px;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.btn-pricing:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

.btn-final-cta {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 20px 50px;
    font-size: 20px;
    box-shadow: 0 8px 25px rgba(239, 68, 68, 0.4);
}

/* === HERO SECTION === */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #FEF3C7 0%, #FCA5A5 100%);
    overflow: hidden;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.hero-img {
    position: relative;
    animation: float 3s ease-in-out infinite;
}

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

.hero-product {
    width: 100%;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.2));
    animation: rotateProduct 6s ease-in-out infinite;
}

@keyframes rotateProduct {
    0%, 100% {
        transform: rotate(0deg) scale(1);
    }
    50% {
        transform: rotate(5deg) scale(1.05);
    }
}

.hero-content {
    animation: fadeInUp 1s ease-out;
}

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

.hero-tag {
    display: inline-block;
    background: var(--white);
    padding: 10px 20px;
    border-radius: 25px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 20px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.hero-title {
    font-size: 48px;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 25px;
    color: var(--dark-color);
}

.hero-description {
    font-size: 18px;
    line-height: 1.8;
    color: #374151;
    margin-bottom: 15px;
}

.hero-stats {
    display: flex;
    gap: 30px;
    margin-top: 30px;
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-item strong {
    font-size: 28px;
    font-weight: 800;
    color: var(--primary-color);
}

.stat-item span {
    font-size: 14px;
    color: #6B7280;
}

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.feature-card {
    background: var(--white);
    padding: 30px;
    border-radius: 20px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 2px solid transparent;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

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

.feature-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--dark-color);
}

.feature-description {
    font-size: 15px;
    color: #6B7280;
    line-height: 1.6;
}

/* === WHAT IS SECTION === */
.what-is {
    background: linear-gradient(135deg, #F3F4F6 0%, #E5E7EB 100%);
}

.what-is-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.what-is-content {
    animation: fadeInLeft 1s ease-out;
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.what-is-text {
    font-size: 16px;
    line-height: 1.8;
    color: #4B5563;
    margin-bottom: 20px;
    text-align: justify;
}

.what-is-img {
    animation: fadeInRight 1s ease-out;
}

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

.what-is-img img {
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
}

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

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

.accordion-item {
    background: var(--white);
    border: 2px solid #E5E7EB;
    border-radius: 15px;
    margin-bottom: 15px;
    overflow: hidden;
    transition: var(--transition);
}

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

.accordion-header {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 20px 25px;
    min-height: 48px;
    font-size: 18px;
    font-weight: 700;
    text-align: left;
    color: var(--dark-color);
    cursor: pointer;
    transition: var(--transition);
}

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

.accordion-icon {
    font-size: 28px;
    flex-shrink: 0;
}

.accordion-toggle {
    margin-left: auto;
    font-size: 28px;
    font-weight: 300;
    color: var(--primary-color);
    transition: transform 0.3s;
}

.accordion-item.active .accordion-toggle {
    transform: rotate(45deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.accordion-content p {
    padding: 0 25px 25px;
    font-size: 16px;
    line-height: 1.8;
    color: #4B5563;
}

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

/* === REVIEWS === */
.reviews {
    background: linear-gradient(135deg, #FEF3C7 0%, #FED7AA 100%);
}

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

.review-card {
    background: var(--white);
    padding: 30px;
    border-radius: 20px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    animation: fadeInUp 0.6s ease-out;
    animation-fill-mode: both;
}

.review-card:nth-child(1) {
    animation-delay: 0.1s;
}

.review-card:nth-child(2) {
    animation-delay: 0.2s;
}

.review-card:nth-child(3) {
    animation-delay: 0.3s;
}

.review-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: var(--shadow-lg);
}

.review-img {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin: 0 auto 15px;
    border: 4px solid var(--primary-color);
}

.review-name {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 5px;
}

.review-location {
    font-size: 14px;
    color: #6B7280;
    margin-bottom: 10px;
}

.review-stars {
    font-size: 20px;
    margin-bottom: 15px;
}

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

.review-verified {
    display: inline-block;
    background: #D1FAE5;
    color: #059669;
    padding: 5px 15px;
    border-radius: 15px;
    font-size: 13px;
    font-weight: 600;
}

/* === PRICING === */
.pricing {
    background: var(--white);
}

.countdown-wrapper {
    text-align: center;
    margin-bottom: 40px;
}

.countdown-label {
    font-size: 18px;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 10px;
}

.countdown {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 20px 40px;
    border-radius: 15px;
    font-size: 48px;
    font-weight: 800;
    box-shadow: 0 8px 25px rgba(239, 68, 68, 0.3);
    letter-spacing: 3px;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 40px;
}

.pricing-card {
    background: var(--white);
    border: 3px solid #E5E7EB;
    border-radius: 25px;
    padding: 30px;
    text-align: center;
    transition: var(--transition);
    position: relative;
}

.pricing-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-color);
}

.pricing-featured {
    border-color: var(--primary-color);
    transform: scale(1.05);
    box-shadow: 0 15px 40px rgba(239, 68, 68, 0.2);
}

.pricing-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 8px 25px;
    border-radius: 25px;
    font-size: 14px;
    font-weight: 700;
    box-shadow: 0 4px 10px rgba(239, 68, 68, 0.3);
}

.pricing-label {
    display: inline-block;
    background: #F3F4F6;
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 15px;
}

.pricing-package {
    font-size: 24px;
    font-weight: 800;
    color: var(--dark-color);
    margin-bottom: 5px;
}

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

.pricing-img {
    max-width: 150px;
    margin: 0 auto 20px;
}

.pricing-per-bottle {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.pricing-price {
    margin-bottom: 15px;
}

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

.price-new {
    display: block;
    font-size: 42px;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.pricing-bonuses {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

.bonus-badge {
    background: #D1FAE5;
    color: #059669;
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 700;
}

.payment-icons {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 15px;
    font-size: 24px;
}

.rating-section {
    text-align: center;
}

.rating-img {
    max-width: 200px;
    margin: 0 auto 10px;
}

.rating-text {
    font-size: 16px;
    color: #6B7280;
}

/* === INGREDIENTS === */
.ingredients {
    background: linear-gradient(135deg, #F9FAFB 0%, #E5E7EB 100%);
}

.ingredients-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
}

.ingredient-card {
    background: var(--white);
    padding: 25px;
    border-radius: 15px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border-left: 4px solid var(--primary-color);
}

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

.ingredient-icon {
    font-size: 32px;
    margin-bottom: 10px;
    display: block;
}

.ingredient-name {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 10px;
}

.ingredient-description {
    font-size: 15px;
    line-height: 1.7;
    color: #4B5563;
}

/* === SCIENTIFIC === */
.scientific {
    background: var(--white);
}

.scientific-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.scientific-card {
    background: linear-gradient(135deg, #F9FAFB 0%, #E5E7EB 100%);
    padding: 30px;
    border-radius: 20px;
    border-left: 5px solid var(--accent-color);
    transition: var(--transition);
}

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

.scientific-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 15px;
}

.scientific-text {
    font-size: 15px;
    line-height: 1.8;
    color: #4B5563;
    margin-bottom: 15px;
}

.scientific-reference {
    font-size: 13px;
    color: #6B7280;
    font-style: italic;
}

/* === GUARANTEE === */
.guarantee {
    background: linear-gradient(135deg, #DBEAFE 0%, #BFDBFE 100%);
}

.guarantee-container {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
    align-items: center;
}

.guarantee-img img {
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
}

.guarantee-item {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
    align-items: flex-start;
}

.guarantee-icon {
    font-size: 32px;
    color: var(--accent-color);
    flex-shrink: 0;
}

.guarantee-subtitle {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark-color);
    margin-bottom: 10px;
}

.guarantee-text {
    font-size: 16px;
    line-height: 1.7;
    color: #4B5563;
}

/* === BENEFITS === */
.benefits {
    background: var(--white);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
}

.benefit-item {
    display: flex;
    align-items: center;
    gap: 15px;
    background: #F9FAFB;
    padding: 20px;
    border-radius: 15px;
    transition: var(--transition);
    border-left: 4px solid var(--accent-color);
}

.benefit-item:hover {
    transform: translateX(10px);
    background: #E5E7EB;
}

.benefit-icon {
    font-size: 28px;
    color: var(--accent-color);
    flex-shrink: 0;
}

.benefit-text {
    font-size: 16px;
    line-height: 1.6;
    color: var(--dark-color);
    font-weight: 500;
}

/* === FAQ === */
.faq {
    background: linear-gradient(135deg, #F9FAFB 0%, #E5E7EB 100%);
}

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

.faq-item {
    background: var(--white);
    border-radius: 15px;
    margin-bottom: 15px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 25px;
    min-height: 48px;
    font-size: 18px;
    font-weight: 700;
    text-align: left;
    color: var(--dark-color);
    cursor: pointer;
    transition: var(--transition);
}

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

.faq-toggle {
    font-size: 28px;
    font-weight: 300;
    color: var(--primary-color);
    flex-shrink: 0;
    transition: transform 0.3s;
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.faq-answer p {
    padding: 0 25px 25px;
    font-size: 16px;
    line-height: 1.8;
    color: #4B5563;
}

.faq-item.active .faq-answer {
    max-height: 400px;
}

/* === FINAL CTA === */
.final-cta {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 80px 0;
}

.final-cta-container {
    text-align: center;
}

.final-cta-img {
    max-width: 300px;
    margin: 0 auto 30px;
    filter: drop-shadow(0 10px 30px rgba(0, 0, 0, 0.3));
}

.final-cta-title {
    font-size: 36px;
    font-weight: 900;
    color: var(--white);
    margin-bottom: 25px;
    line-height: 1.3;
}

.final-cta-pricing {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    margin-bottom: 30px;
}

.final-cta-old-price {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: line-through;
}

.final-cta-new-price {
    font-size: 48px;
    font-weight: 900;
    color: var(--white);
}

.btn-final-cta {
    background: var(--white);
    color: var(--primary-color);
}

.btn-final-cta:hover {
    transform: translateY(-3px) scale(1.05);
}

/* === FOOTER === */
.footer {
    background: var(--dark-color);
    color: var(--white);
    padding: 60px 0 30px;
}

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

.footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.footer-link {
    color: var(--white);
    font-weight: 500;
    transition: var(--transition);
}

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

.footer-social {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 30px;
}

.social-link {
    font-size: 28px;
    transition: var(--transition);
}

.social-link:hover {
    transform: scale(1.2);
}

.footer-disclaimer {
    max-width: 900px;
    margin: 0 auto 30px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    font-size: 14px;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.8);
}

.footer-copyright {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
}

/* === PURCHASE NOTIFICATION === */
.purchase-notification {
    position: fixed;
    bottom: -100px;
    left: 20px;
    background: var(--white);
    padding: 15px 20px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    z-index: 999;
    transition: bottom 0.5s ease;
    max-width: 300px;
}

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

.notification-content {
    display: flex;
    align-items: center;
    gap: 15px;
}

.notification-icon {
    font-size: 24px;
    color: var(--accent-color);
    flex-shrink: 0;
}

.notification-text {
    font-size: 14px;
}

.notification-text strong {
    color: var(--dark-color);
}

.notification-time {
    font-size: 12px;
    color: #6B7280;
}

/* === SCROLL TO TOP === */
.scroll-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    border-radius: 50%;
    font-size: 24px;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.3);
    cursor: pointer;
    transition: var(--transition);
    z-index: 998;
}

.scroll-to-top.show {
    display: flex;
}

.scroll-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(239, 68, 68, 0.4);
}

/* === RESPONSIVE - TABLETS === */
@media (min-width: 576px) and (max-width: 767px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .pricing-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* === RESPONSIVE - MOBILE === */
@media (max-width: 767px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        justify-content: flex-start;
        padding: 80px 30px 30px;
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
        transition: right 0.4s ease;
        z-index: 100;
    }
    
    .nav-menu.show {
        right: 0;
    }
    
    .nav-list {
        flex-direction: column;
        width: 100%;
    }
    
    .nav-link {
        padding: 15px 0;
        border-bottom: 1px solid #E5E7EB;
    }
    
    .nav-cta {
        width: 100%;
        justify-content: center;
    }
    
    .nav-toggle {
        display: flex;
        position: relative;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .hero-title {
        font-size: 28px;
    }
    
    .hero-description {
        font-size: 16px;
    }
    
    .section-title {
        font-size: 26px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .what-is-container {
        grid-template-columns: 1fr;
    }
    
    .what-is-img {
        order: -1;
    }
    
    .reviews-grid {
        grid-template-columns: 1fr;
    }
    
    .countdown {
        font-size: 36px;
        padding: 15px 30px;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-featured {
        transform: scale(1);
    }
    
    .ingredients-grid {
        grid-template-columns: 1fr;
    }
    
    .scientific-grid {
        grid-template-columns: 1fr;
    }
    
    .guarantee-container {
        grid-template-columns: 1fr;
    }
    
    .guarantee-img {
        order: -1;
    }
    
    .benefits-grid {
        grid-template-columns: 1fr;
    }
    
    .final-cta-title {
        font-size: 26px;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 15px;
    }
}

/* === RESPONSIVE - SMALL PHONES === */
@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .section {
        padding: 40px 0;
    }
    
    .hero-title {
        font-size: 24px;
    }
    
    .hero-stats {
        gap: 15px;
    }
    
    .stat-item strong {
        font-size: 22px;
    }
    
    .countdown {
        font-size: 28px;
        padding: 12px 20px;
    }
    
    .price-new {
        font-size: 32px;
    }
}

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

/* === UTILITY CLASSES === */
.text-center {
    text-align: center;
}

.mb-1 {
    margin-bottom: 10px;
}

.mb-2 {
    margin-bottom: 20px;
}

.mb-3 {
    margin-bottom: 30px;
}

.mt-1 {
    margin-top: 10px;
}

.mt-2 {
    margin-top: 20px;
}

.mt-3 {
    margin-top: 30px;
}