/* ==========================================================================
   NEURO SERGE™ - PREMIUM BRAIN HEALTH SUPPLEMENT
   Medical Professional Design with Calming Blues
   Mobile-First Responsive CSS
   ========================================================================== */

/* ==========================================================================
   CSS VARIABLES & ROOT STYLES
   ========================================================================== */
:root {
    /* Primary Color Palette - Medical Professional Blues */
    --primary-dark: #1E40AF;
    --primary: #3B82F6;
    --primary-light: #93C5FD;
    --primary-lighter: #DBEAFE;
    
    /* Accent Colors */
    --accent-gold: #F59E0B;
    --accent-green: #10B981;
    --accent-red: #EF4444;
    
    /* Neutral Colors */
    --white: #FFFFFF;
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;
    
    /* Typography */
    --font-display: 'Playfair Display', serif;
    --font-body: 'Source Sans 3', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
    
    /* Container Widths */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1280px;
    --container-2xl: 1536px;
}

/* ==========================================================================
   RESET & BASE STYLES
   ========================================================================== */
* {
    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: var(--font-body);
    font-size: 16px;
    line-height: 1.7;
    color: var(--gray-800);
    background-color: var(--white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    transition: all var(--transition-base);
}

ul, ol {
    list-style: none;
}

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

/* ==========================================================================
   UTILITY CLASSES
   ========================================================================== */
.container {
    width: 100%;
    max-width: var(--container-xl);
    margin-left: auto;
    margin-right: auto;
    padding-left: 20px;
    padding-right: 20px;
}

@media (min-width: 576px) {
    .container {
        padding-left: 24px;
        padding-right: 24px;
    }
}

@media (min-width: 1024px) {
    .container {
        padding-left: 32px;
        padding-right: 32px;
    }
}

.section-title {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 700;
    color: var(--gray-900);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    line-height: 1.2;
}

@media (min-width: 768px) {
    .section-title {
        font-size: 36px;
        margin-bottom: var(--spacing-xl);
    }
}

@media (min-width: 1024px) {
    .section-title {
        font-size: 44px;
    }
}

/* ==========================================================================
   HEADER & NAVIGATION
   ========================================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--white);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    transition: all var(--transition-base);
}

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

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 16px 20px;
}

@media (min-width: 768px) {
    .nav-container {
        padding: 20px 32px;
    }
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 1001;
}

.nav-logo {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

@media (min-width: 768px) {
    .nav-logo {
        width: 50px;
        height: 50px;
    }
}

.brand-name {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-dark);
}

@media (min-width: 768px) {
    .brand-name {
        font-size: 24px;
    }
}

.hamburger {
    display: flex;
    flex-direction: column;
    gap: 5px;
    width: 30px;
    height: 30px;
    padding: 5px;
    z-index: 1001;
}

.hamburger span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--primary-dark);
    transition: all var(--transition-base);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

@media (min-width: 768px) {
    .hamburger {
        display: none;
    }
}

.nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background-color: var(--white);
    box-shadow: var(--shadow-2xl);
    padding: 80px 24px 24px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    transition: right var(--transition-base);
    z-index: 1000;
}

.nav-menu.active {
    right: 0;
}

@media (min-width: 768px) {
    .nav-menu {
        position: static;
        width: auto;
        height: auto;
        background-color: transparent;
        box-shadow: none;
        padding: 0;
        flex-direction: row;
        align-items: center;
        gap: 32px;
    }
}

.nav-link {
    font-size: 16px;
    font-weight: 500;
    color: var(--gray-700);
    padding: 12px 0;
    border-bottom: 1px solid var(--gray-200);
}

.nav-link:hover {
    color: var(--primary);
}

@media (min-width: 768px) {
    .nav-link {
        padding: 0;
        border-bottom: none;
    }
}

.nav-cta {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: 12px 24px;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 16px;
    text-align: center;
    min-height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero {
    padding: 120px 0 60px;
    background: linear-gradient(135deg, var(--primary-lighter) 0%, var(--white) 100%);
}

@media (min-width: 768px) {
    .hero {
        padding: 140px 0 80px;
    }
}

.hero-container {
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    align-items: center;
}

@media (min-width: 768px) {
    .hero-container {
        grid-template-columns: 1fr 1fr;
        gap: 60px;
        padding: 0 32px;
    }
}

.hero-image {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    order: -1;
}

@media (min-width: 768px) {
    .hero-image {
        order: 0;
    }
}

.product-bottle {
    width: 100%;
    max-width: 400px;
    height: auto;
    position: relative;
    z-index: 2;
    animation: float 6s ease-in-out infinite;
}

@media (min-width: 768px) {
    .product-bottle {
        max-width: 500px;
    }
}

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

.hero-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, var(--primary-light) 0%, transparent 70%);
    opacity: 0.3;
    animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.3; }
    50% { transform: translate(-50%, -50%) scale(1.1); opacity: 0.5; }
}

.hero-content {
    text-align: left;
}

.hero-title {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 800;
    color: var(--gray-900);
    line-height: 1.2;
    margin-bottom: 20px;
}

@media (min-width: 576px) {
    .hero-title {
        font-size: 32px;
    }
}

@media (min-width: 768px) {
    .hero-title {
        font-size: 38px;
    }
}

@media (min-width: 1024px) {
    .hero-title {
        font-size: 46px;
    }
}

.hero-description {
    margin-bottom: 24px;
}

.hero-description p {
    font-size: 16px;
    line-height: 1.7;
    color: var(--gray-700);
    margin-bottom: 16px;
}

@media (min-width: 768px) {
    .hero-description p {
        font-size: 17px;
    }
}

.hero-benefits {
    margin-bottom: 32px;
}

.hero-benefits li {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 16px;
    font-weight: 500;
    color: var(--gray-800);
    padding: 12px 0;
    border-bottom: 1px solid var(--gray-200);
}

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

@media (min-width: 768px) {
    .hero-benefits li {
        font-size: 17px;
    }
}

.benefit-icon {
    font-size: 24px;
    flex-shrink: 0;
}

.hero-cta {
    display: inline-block;
    background: linear-gradient(135deg, var(--accent-gold) 0%, #D97706 100%);
    color: var(--white);
    padding: 18px 40px;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 18px;
    text-align: center;
    min-height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
}

.hero-cta:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

@media (min-width: 576px) {
    .hero-cta {
        width: auto;
    }
}

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

@media (min-width: 768px) {
    .why-choose {
        padding: 80px 0;
    }
}

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

@media (min-width: 576px) {
    .why-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 992px) {
    .why-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 30px;
    }
}

.why-card {
    background-color: var(--gray-50);
    padding: 32px 24px;
    border-radius: var(--radius-xl);
    text-align: center;
    transition: all var(--transition-base);
    border: 2px solid transparent;
}

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

.why-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 16px;
}

.why-card h3 {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.why-card p {
    font-size: 15px;
    line-height: 1.6;
    color: var(--gray-600);
}

/* ==========================================================================
   FORMULA STANDOUT SECTION
   ========================================================================== */
.formula-standout {
    padding: 60px 0;
    background-color: var(--gray-50);
}

@media (min-width: 768px) {
    .formula-standout {
        padding: 80px 0;
    }
}

.standout-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
}

@media (min-width: 768px) {
    .standout-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }
}

.standout-item {
    background-color: var(--white);
    padding: 32px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    position: relative;
    transition: all var(--transition-base);
}

.standout-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.standout-number {
    position: absolute;
    top: -16px;
    left: 32px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 700;
    box-shadow: var(--shadow-lg);
}

.standout-item h3 {
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 16px;
    margin-top: 8px;
}

.standout-item p {
    font-size: 16px;
    line-height: 1.7;
    color: var(--gray-700);
}

/* ==========================================================================
   WHAT IS SECTION
   ========================================================================== */
.what-is {
    padding: 60px 0;
    background-color: var(--white);
}

@media (min-width: 768px) {
    .what-is {
        padding: 80px 0;
    }
}

.what-is-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    align-items: center;
}

@media (min-width: 768px) {
    .what-is-content {
        grid-template-columns: 1.2fr 1fr;
        gap: 60px;
    }
}

.what-is-text p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--gray-700);
    margin-bottom: 20px;
}

.what-is-text p:last-child {
    margin-bottom: 0;
}

.what-is-image {
    order: -1;
}

@media (min-width: 768px) {
    .what-is-image {
        order: 0;
    }
}

.what-is-image img {
    width: 100%;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
}

/* ==========================================================================
   HOW IT WORKS SECTION
   ========================================================================== */
.how-it-works {
    padding: 60px 0;
    background: linear-gradient(135deg, var(--primary-lighter) 0%, var(--white) 100%);
}

@media (min-width: 768px) {
    .how-it-works {
        padding: 80px 0;
    }
}

.how-intro {
    max-width: 900px;
    margin: 0 auto 40px;
    text-align: center;
}

.how-intro p {
    font-size: 17px;
    line-height: 1.8;
    color: var(--gray-700);
}

.steps-container {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

@media (min-width: 768px) {
    .steps-container {
        gap: 32px;
    }
}

.step-item {
    background-color: var(--white);
    border-radius: var(--radius-xl);
    padding: 28px;
    box-shadow: var(--shadow-md);
    display: flex;
    gap: 20px;
    transition: all var(--transition-base);
    border-left: 4px solid var(--primary);
}

.step-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-lg);
}

.step-number {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 700;
    box-shadow: var(--shadow-md);
}

.step-content h3 {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.step-content p {
    font-size: 16px;
    line-height: 1.7;
    color: var(--gray-700);
}

/* ==========================================================================
   REVIEWS SECTION
   ========================================================================== */
.reviews {
    padding: 60px 0;
    background-color: var(--gray-50);
}

@media (min-width: 768px) {
    .reviews {
        padding: 80px 0;
    }
}

.reviews-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    margin-bottom: 32px;
}

@media (min-width: 576px) {
    .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 992px) {
    .reviews-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 30px;
    }
}

.review-card {
    background-color: var(--white);
    padding: 32px 24px;
    border-radius: var(--radius-xl);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

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

.review-avatar {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-full);
    margin: 0 auto 16px;
    object-fit: cover;
    border: 3px solid var(--primary-light);
}

.review-stars {
    color: var(--accent-gold);
    font-size: 24px;
    margin-bottom: 12px;
}

.review-name {
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.review-text {
    font-size: 15px;
    line-height: 1.7;
    color: var(--gray-600);
    font-style: italic;
}

.reviews-note {
    text-align: center;
}

.reviews-note p {
    font-size: 17px;
    font-weight: 600;
    color: var(--primary-dark);
}

/* ==========================================================================
   RESEARCH-BACKED SECTION
   ========================================================================== */
.research-backed {
    padding: 60px 0;
    background-color: var(--white);
}

@media (min-width: 768px) {
    .research-backed {
        padding: 80px 0;
    }
}

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

.research-content > p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--gray-700);
    margin-bottom: 32px;
}

.research-benefits {
    background-color: var(--gray-50);
    padding: 32px;
    border-radius: var(--radius-xl);
    margin-bottom: 32px;
    border-left: 4px solid var(--accent-green);
}

.research-benefits li {
    font-size: 16px;
    line-height: 1.7;
    color: var(--gray-800);
    padding: 12px 0;
    padding-left: 32px;
    position: relative;
}

.research-benefits li::before {
    content: '•';
    position: absolute;
    left: 12px;
    color: var(--accent-green);
    font-size: 24px;
    font-weight: 700;
}

.research-cta {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: 16px 40px;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 17px;
    text-align: center;
    min-height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
}

.research-cta:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

/* ==========================================================================
   PRICING SECTION
   ========================================================================== */
.pricing {
    padding: 60px 0;
    background: linear-gradient(135deg, var(--primary-lighter) 0%, var(--white) 100%);
}

@media (min-width: 768px) {
    .pricing {
        padding: 80px 0;
    }
}

.pricing-subtitle {
    text-align: center;
    font-size: 18px;
    color: var(--gray-700);
    margin-bottom: 32px;
}

.countdown-timer {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin-bottom: 40px;
}

.timer-box {
    background: linear-gradient(135deg, var(--accent-red) 0%, #DC2626 100%);
    color: var(--white);
    padding: 20px 28px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.timer-value {
    display: block;
    font-family: var(--font-display);
    font-size: 36px;
    font-weight: 700;
    line-height: 1;
}

@media (min-width: 768px) {
    .timer-value {
        font-size: 48px;
    }
}

.timer-label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 8px;
    opacity: 0.9;
}

.timer-separator {
    font-family: var(--font-display);
    font-size: 36px;
    font-weight: 700;
    color: var(--accent-red);
}

@media (min-width: 768px) {
    .timer-separator {
        font-size: 48px;
    }
}

.pricing-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    margin-bottom: 32px;
}

@media (min-width: 576px) {
    .pricing-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 992px) {
    .pricing-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 30px;
    }
}

.pricing-card {
    background-color: var(--white);
    border-radius: var(--radius-2xl);
    padding: 32px 24px;
    text-align: center;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
    border: 2px solid transparent;
    position: relative;
}

.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-2xl);
}

.pricing-featured {
    border-color: var(--accent-gold);
    transform: scale(1.05);
}

@media (max-width: 991px) {
    .pricing-featured {
        transform: scale(1);
    }
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--accent-gold) 0%, #D97706 100%);
    color: var(--white);
    padding: 6px 20px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: var(--shadow-md);
}

.pricing-label {
    font-size: 14px;
    font-weight: 700;
    color: var(--gray-600);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.pricing-bottles {
    font-family: var(--font-display);
    font-size: 26px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 4px;
}

.pricing-supply {
    font-size: 14px;
    color: var(--gray-600);
    margin-bottom: 20px;
}

.pricing-image {
    width: 100%;
    max-width: 200px;
    height: auto;
    margin: 0 auto 20px;
}

.pricing-price {
    margin-bottom: 12px;
}

.price-per {
    font-family: var(--font-display);
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-dark);
}

.pricing-total {
    margin-bottom: 16px;
}

.old-price {
    font-size: 20px;
    color: var(--gray-400);
    text-decoration: line-through;
    margin-right: 8px;
}

.new-price {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 700;
    color: var(--accent-green);
}

.pricing-perks {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 20px;
}

.perk-badge {
    background-color: var(--accent-green);
    color: var(--white);
    padding: 6px 16px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.pricing-button {
    display: block;
    width: 100%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: 16px 32px;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 17px;
    text-align: center;
    min-height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
}

.pricing-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.pricing-button-featured {
    background: linear-gradient(135deg, var(--accent-gold) 0%, #D97706 100%);
}

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

.pricing-rating img {
    margin: 0 auto;
}

/* ==========================================================================
   INGREDIENTS SECTION
   ========================================================================== */
.ingredients {
    padding: 60px 0;
    background-color: var(--white);
}

@media (min-width: 768px) {
    .ingredients {
        padding: 80px 0;
    }
}

.ingredients-intro {
    max-width: 900px;
    margin: 0 auto 40px;
    text-align: center;
}

.ingredients-intro p {
    font-size: 17px;
    line-height: 1.8;
    color: var(--gray-700);
}

.ingredients-showcase {
    max-width: 1100px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
}

.ingredient-item {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    align-items: center;
}

@media (min-width: 768px) {
    .ingredient-item {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }
}

.ingredient-left .ingredient-visual {
    order: 1;
}

.ingredient-left .ingredient-content {
    order: 0;
}

@media (max-width: 767px) {
    .ingredient-left .ingredient-visual {
        order: 0;
    }
    
    .ingredient-left .ingredient-content {
        order: 1;
    }
}

.ingredient-visual img {
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.ingredient-content {
    background-color: var(--gray-50);
    padding: 32px;
    border-radius: var(--radius-xl);
    border-left: 4px solid var(--primary);
}

.ingredient-content h3 {
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 16px;
}

.ingredient-content p {
    font-size: 16px;
    line-height: 1.7;
    color: var(--gray-700);
}

/* ==========================================================================
   SCIENTIFIC EVIDENCE SECTION
   ========================================================================== */
.scientific-evidence {
    padding: 60px 0;
    background-color: var(--gray-50);
}

@media (min-width: 768px) {
    .scientific-evidence {
        padding: 80px 0;
    }
}

.evidence-content {
    max-width: 1000px;
    margin: 0 auto;
}

.evidence-intro {
    margin-bottom: 40px;
}

.evidence-intro p {
    font-size: 17px;
    line-height: 1.8;
    color: var(--gray-700);
}

.evidence-category {
    background-color: var(--white);
    padding: 32px;
    border-radius: var(--radius-xl);
    margin-bottom: 24px;
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--primary);
}

.evidence-category h3 {
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 20px;
}

.evidence-category p {
    font-size: 15px;
    line-height: 1.8;
    color: var(--gray-700);
    margin-bottom: 16px;
}

.evidence-category p:last-child {
    margin-bottom: 0;
}

.evidence-summary {
    background-color: var(--primary-lighter);
    padding: 32px;
    border-radius: var(--radius-xl);
    margin-top: 32px;
}

.evidence-summary p {
    font-size: 17px;
    line-height: 1.8;
    color: var(--gray-800);
    font-weight: 500;
}

/* ==========================================================================
   GUARANTEE SECTION
   ========================================================================== */
.guarantee {
    padding: 60px 0;
    background-color: var(--white);
}

@media (min-width: 768px) {
    .guarantee {
        padding: 80px 0;
    }
}

.guarantee-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    align-items: center;
}

@media (min-width: 768px) {
    .guarantee-content {
        grid-template-columns: 1fr 1.5fr;
        gap: 60px;
    }
}

.guarantee-image img {
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
}

.guarantee-item {
    margin-bottom: 28px;
}

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

.guarantee-item h3 {
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.guarantee-item p {
    font-size: 16px;
    line-height: 1.7;
    color: var(--gray-700);
}

/* ==========================================================================
   BENEFITS SECTION
   ========================================================================== */
.benefits {
    padding: 60px 0;
    background: linear-gradient(135deg, var(--primary-lighter) 0%, var(--white) 100%);
}

@media (min-width: 768px) {
    .benefits {
        padding: 80px 0;
    }
}

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

.benefits-content p {
    font-size: 17px;
    line-height: 1.9;
    color: var(--gray-700);
    margin-bottom: 32px;
}

.benefits-cta {
    display: inline-block;
    background: linear-gradient(135deg, var(--accent-gold) 0%, #D97706 100%);
    color: var(--white);
    padding: 16px 40px;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 17px;
    text-align: center;
    min-height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
}

.benefits-cta:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

/* ==========================================================================
   PROS AND CONS SECTION
   ========================================================================== */
.pros-cons {
    padding: 60px 0;
    background-color: var(--white);
}

@media (min-width: 768px) {
    .pros-cons {
        padding: 80px 0;
    }
}

.pros-cons-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
    max-width: 1000px;
    margin: 0 auto;
}

@media (min-width: 768px) {
    .pros-cons-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }
}

.pros-section, .cons-section {
    background-color: var(--gray-50);
    padding: 32px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.pros-section {
    border-left: 4px solid var(--accent-green);
}

.cons-section {
    border-left: 4px solid var(--accent-red);
}

.pros-section h3, .cons-section h3 {
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 20px;
}

.pros-list li, .cons-list li {
    font-size: 16px;
    line-height: 1.7;
    color: var(--gray-700);
    padding: 12px 0;
    border-bottom: 1px solid var(--gray-200);
}

.pros-list li:last-child, .cons-list li:last-child {
    border-bottom: none;
}

/* ==========================================================================
   BONUSES SECTION
   ========================================================================== */
.bonuses {
    padding: 60px 0;
    background-color: var(--gray-50);
}

@media (min-width: 768px) {
    .bonuses {
        padding: 80px 0;
    }
}

.bonuses-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
}

@media (min-width: 768px) {
    .bonuses-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }
}

.bonus-card {
    background-color: var(--white);
    padding: 32px;
    border-radius: var(--radius-xl);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

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

.bonus-image {
    width: 100%;
    max-width: 300px;
    margin: 0 auto 20px;
    border-radius: var(--radius-lg);
}

.bonus-card h3 {
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 16px;
}

.bonus-card p {
    font-size: 15px;
    line-height: 1.7;
    color: var(--gray-700);
}

/* ==========================================================================
   WHERE TO BUY SECTION
   ========================================================================== */
.where-to-buy {
    padding: 60px 0;
    background-color: var(--white);
}

@media (min-width: 768px) {
    .where-to-buy {
        padding: 80px 0;
    }
}

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

.where-content p {
    font-size: 17px;
    line-height: 1.9;
    color: var(--gray-700);
}

/* ==========================================================================
   BUY PROCESS SECTION
   ========================================================================== */
.buy-process {
    padding: 60px 0;
    background: linear-gradient(135deg, var(--primary-lighter) 0%, var(--white) 100%);
}

@media (min-width: 768px) {
    .buy-process {
        padding: 80px 0;
    }
}

.buy-process-content {
    max-width: 1000px;
    margin: 0 auto;
}

.process-steps {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    margin-bottom: 40px;
}

@media (min-width: 576px) {
    .process-steps {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
}

@media (min-width: 992px) {
    .process-steps {
        grid-template-columns: repeat(4, 1fr);
    }
}

.process-step {
    background-color: var(--white);
    padding: 24px;
    border-radius: var(--radius-xl);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

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

.process-number {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    width: 56px;
    height: 56px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 700;
    margin: 0 auto 16px;
    box-shadow: var(--shadow-md);
}

.process-step p {
    font-size: 15px;
    line-height: 1.6;
    color: var(--gray-700);
}

.process-image {
    margin-bottom: 32px;
    text-align: center;
}

.process-image img {
    max-width: 500px;
    width: 100%;
    margin: 0 auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.process-security p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--gray-700);
    margin-bottom: 20px;
}

.process-security p:last-child {
    margin-bottom: 0;
}

/* ==========================================================================
   FAQ SECTION
   ========================================================================== */
.faq {
    padding: 60px 0;
    background-color: var(--white);
}

@media (min-width: 768px) {
    .faq {
        padding: 80px 0;
    }
}

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

.faq-item {
    background-color: var(--gray-50);
    border-radius: var(--radius-lg);
    margin-bottom: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.faq-item:hover {
    box-shadow: var(--shadow-md);
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    background-color: transparent;
    text-align: left;
    font-size: 17px;
    font-weight: 600;
    color: var(--gray-900);
    cursor: pointer;
    min-height: 48px;
}

.faq-question:hover {
    background-color: var(--gray-100);
}

.faq-icon {
    font-size: 24px;
    font-weight: 300;
    color: var(--primary);
    transition: transform var(--transition-base);
    flex-shrink: 0;
    margin-left: 16px;
}

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

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
}

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

.faq-answer p {
    padding: 0 24px 20px;
    font-size: 16px;
    line-height: 1.7;
    color: var(--gray-700);
}

/* ==========================================================================
   FINAL CTA SECTION
   ========================================================================== */
.final-cta {
    padding: 60px 0;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    color: var(--white);
    text-align: center;
}

@media (min-width: 768px) {
    .final-cta {
        padding: 80px 0;
    }
}

.final-product {
    max-width: 400px;
    margin: 0 auto 32px;
}

.final-title {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 24px;
    line-height: 1.3;
}

@media (min-width: 768px) {
    .final-title {
        font-size: 38px;
    }
}

.final-pricing {
    margin-bottom: 16px;
}

.final-regular {
    display: block;
    font-size: 18px;
    margin-bottom: 8px;
    opacity: 0.9;
}

.final-regular del {
    color: var(--white);
}

.final-special {
    display: block;
    font-family: var(--font-display);
    font-size: 42px;
    font-weight: 700;
    color: var(--accent-gold);
}

@media (min-width: 768px) {
    .final-special {
        font-size: 52px;
    }
}

.final-subtext {
    font-size: 16px;
    margin-bottom: 32px;
    opacity: 0.9;
}

.final-button {
    display: inline-block;
    background: linear-gradient(135deg, var(--accent-gold) 0%, #D97706 100%);
    color: var(--white);
    padding: 18px 50px;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 20px;
    text-align: center;
    min-height: 60px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 450px;
}

.final-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-2xl);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer {
    background-color: var(--gray-900);
    color: var(--gray-300);
    padding: 60px 0 32px;
}

.footer-content {
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 0 20px;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 24px;
    margin-bottom: 32px;
}

.footer-links a {
    font-size: 15px;
    color: var(--gray-300);
}

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

.footer-disclaimer {
    max-width: 900px;
    margin: 0 auto 32px;
    text-align: center;
}

.footer-disclaimer p {
    font-size: 13px;
    line-height: 1.6;
    color: var(--gray-400);
}

.footer-social {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 24px;
}

.footer-social a {
    color: var(--gray-400);
    transition: color var(--transition-base);
}

.footer-social a:hover {
    color: var(--primary-light);
}

.footer-copyright {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid var(--gray-700);
}

.footer-copyright p {
    font-size: 14px;
    color: var(--gray-500);
}

/* ==========================================================================
   SCROLL TO TOP BUTTON
   ========================================================================== */
.scroll-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-xl);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 999;
}

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

.scroll-top:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-2xl);
}

/* ==========================================================================
   PURCHASE NOTIFICATION POPUP
   ========================================================================== */
.purchase-notification {
    position: fixed;
    bottom: 24px;
    left: 24px;
    background-color: var(--white);
    padding: 16px 20px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-2xl);
    display: flex;
    align-items: center;
    gap: 12px;
    max-width: 350px;
    transform: translateX(-500px);
    transition: transform var(--transition-slow);
    z-index: 998;
    border-left: 4px solid var(--accent-green);
}

@media (max-width: 576px) {
    .purchase-notification {
        left: 50%;
        transform: translateX(-50%) translateY(200px);
        bottom: 80px;
        max-width: calc(100% - 48px);
    }
}

.purchase-notification.show {
    transform: translateX(0);
}

@media (max-width: 576px) {
    .purchase-notification.show {
        transform: translateX(-50%) translateY(0);
    }
}

.notification-content {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
}

.notification-text {
    font-size: 14px;
    line-height: 1.4;
    color: var(--gray-800);
    flex: 1;
}

.notification-close {
    color: var(--gray-400);
    font-size: 20px;
    line-height: 1;
    padding: 4px;
    flex-shrink: 0;
}

.notification-close:hover {
    color: var(--gray-700);
}

/* ==========================================================================
   ANIMATIONS
   ========================================================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

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

/* Focus visible for keyboard navigation */
*:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* ==========================================================================
   PRINT STYLES
   ========================================================================== */
@media print {
    .header,
    .nav-menu,
    .scroll-top,
    .purchase-notification,
    .countdown-timer {
        display: none !important;
    }
    
    body {
        font-size: 12pt;
    }
    
    .section-title {
        page-break-after: avoid;
    }
}