/* ==========================================================================
   NITRIC BOOST ULTRA - PREMIUM LANDING PAGE STYLESHEET
   ========================================================================== */

/* --- Typography & Design Tokens --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800;900&display=swap');

:root {
    /* Color Palette */
    --color-primary-dark: #020617;   /* Slate Pitch Black */
    --color-primary: #070d19;        /* Ultra Deep Navy Black */
    --color-primary-light: #0f172a;  /* Deep Navy Slate */
    --color-accent-blue: #2563eb;    /* Radiant Cobalt Blue */
    --color-accent-blue-rgb: 37, 99, 235;
    --color-accent-blue-dark: #1d4ed8;
    --color-accent-gold: #fbbf24;    /* Bright Gold */
    --color-accent-amber: #d97706;   /* Dark Amber Gold */
    --color-sand: #f8fafc;           /* Sleek ice blue-white */
    --color-text-dark: #0f172a;
    --color-text-muted: #94a3b8;     /* Slate grey */
    --color-text-light: #f8fafc;
    --color-glass-bg: rgba(15, 23, 42, 0.7);
    --color-glass-border: rgba(37, 99, 235, 0.2);

    /* Fonts */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.7s cubic-bezier(0.4, 0, 0.2, 1);

    /* 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-blue: 0 10px 25px -5px rgba(37, 99, 235, 0.3), 0 8px 10px -6px rgba(37, 99, 235, 0.3);
    --shadow-glow: 0 0 35px 5px rgba(37, 99, 235, 0.18);
}

/* --- Resets --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    background-color: var(--color-primary-dark);
    color: var(--color-text-light);
    font-family: var(--font-body);
    -webkit-font-smoothing: antialiased;
}

body {
    overflow-x: hidden;
    line-height: 1.6;
}

/* --- Helper Classes --- */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.text-gold { color: var(--color-accent-gold); }
.text-amber { color: var(--color-accent-amber); }
.text-blue { color: var(--color-accent-blue); }
.text-muted { color: var(--color-text-muted); }
.bg-dark { background-color: var(--color-primary-dark); }
.bg-light { background-color: var(--color-primary-light); }

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

/* --- Animations --- */
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 20px 2px rgba(37, 99, 235, 0.2); }
    50% { box-shadow: 0 0 35px 8px rgba(37, 99, 235, 0.45); }
}

@keyframes shine {
    100% { left: 125%; }
}

@keyframes orbit {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.animate-float {
    animation: float 5s ease-in-out infinite;
}

/* --- Scroll Reveal Effects --- */
.reveal {
    opacity: 0;
    transform: translateY(25px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* --- Sticky Header & Navigation --- */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: background-color var(--transition-normal), padding var(--transition-normal);
    padding: 24px 0;
}

header.scrolled {
    background-color: rgba(2, 6, 23, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(37, 99, 235, 0.15);
    padding: 12px 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--color-text-light);
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.45rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.logo svg {
    width: 28px;
    height: 28px;
    fill: var(--color-accent-blue);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 28px;
    list-style: none;
}

.nav-link {
    text-decoration: none;
    color: var(--color-text-light);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent-blue);
    transition: width var(--transition-fast);
}

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

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

/* Primary Button Styling */
.btn-cta {
    position: relative;
    overflow: hidden;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-accent-blue), var(--color-accent-blue-dark));
    color: var(--color-text-light);
    text-decoration: none;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.95rem;
    text-transform: uppercase;
    padding: 12px 28px;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-cta::after {
    content: '';
    position: absolute;
    top: 0;
    left: -75%;
    width: 50%;
    height: 100%;
    background: linear-gradient(to right, rgba(255,255,255,0) 0%, rgba(255,255,255,0.2) 100%);
    transform: skewX(-25deg);
    transition: 0.75s;
}

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

.btn-cta:hover::after {
    animation: shine 1.2s ease-in-out infinite;
}

.btn-cta:active {
    transform: translateY(1px);
}

.btn-large {
    font-size: 1.1rem;
    padding: 16px 40px;
    letter-spacing: 0.05em;
    animation: pulse-glow 3s infinite;
}

.btn-gold {
    background: linear-gradient(135deg, var(--color-accent-amber), var(--color-accent-gold));
    color: var(--color-primary-dark);
}

.btn-gold:hover {
    box-shadow: 0 10px 25px -5px rgba(217, 119, 6, 0.4);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 3px;
    background-color: var(--color-text-light);
    margin: 4px 0;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* --- Hero Section --- */
.hero {
    position: relative;
    padding: 180px 0 120px 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: radial-gradient(circle at 60% 40%, rgba(37, 99, 235, 0.08) 0%, rgba(2, 6, 23, 1) 75%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background-image: radial-gradient(rgba(37, 99, 235, 0.02) 1px, transparent 1px);
    background-size: 32px 32px;
    pointer-events: none;
}

.hero .container {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 48px;
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.hero-tagline {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-accent-gold);
    margin-bottom: 16px;
    padding: 6px 16px;
    background-color: rgba(251, 191, 36, 0.08);
    border-radius: 4px;
    border: 1px solid rgba(251, 191, 36, 0.15);
}

.hero-title {
    font-size: 3.75rem;
    font-weight: 900;
    line-height: 1.1;
    text-transform: uppercase;
    margin-bottom: 24px;
    text-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

.hero-description {
    font-size: 1.15rem;
    color: var(--color-text-muted);
    margin-bottom: 32px;
    max-width: 580px;
    line-height: 1.7;
}

.hero-badges {
    display: flex;
    gap: 16px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.hero-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-light);
    background: var(--color-primary-light);
    padding: 8px 16px;
    border-radius: 4px;
    border: 1px solid var(--color-glass-border);
}

.hero-badge svg {
    width: 16px;
    height: 16px;
    fill: var(--color-accent-blue);
}

/* Hero Right Graphics */
.hero-visuals {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-image-wrap {
    width: 100%;
    max-width: 450px;
    position: relative;
    z-index: 5;
}

.hero-image-wrap img {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 20px 40px rgba(0,0,0,0.8));
}

.hero-glow-ring {
    position: absolute;
    width: 380px;
    height: 380px;
    border: 1px dashed rgba(37, 99, 235, 0.3);
    border-radius: 50%;
    z-index: 2;
    animation: orbit 30s linear infinite;
    pointer-events: none;
}

.hero-glow-ring::after {
    content: '';
    position: absolute;
    top: 10%; left: 10%; right: 10%; bottom: 10%;
    border: 1px solid rgba(251, 191, 36, 0.1);
    border-radius: 50%;
}

/* --- Science Segment (Vasodilation flow) --- */
.science-section {
    padding: 100px 0;
    background-color: var(--color-primary);
    border-top: 1px solid rgba(37, 99, 235, 0.1);
}

.science-intro-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 80px;
}

.science-intro-text p {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    margin-bottom: 24px;
    line-height: 1.7;
}

.science-pathway-graphic {
    background: var(--color-primary-light);
    border: 1px solid var(--color-glass-border);
    border-radius: 16px;
    padding: 40px;
    display: flex;
    flex-direction: column;
    gap: 32px;
    box-shadow: var(--shadow-lg);
}

.pathway-step {
    display: grid;
    grid-template-columns: 60px 1fr;
    gap: 20px;
    position: relative;
}

.pathway-step:not(:last-child)::after {
    content: '';
    position: absolute;
    top: 50px;
    left: 29px;
    width: 2px;
    height: calc(100% - 15px);
    background: dashed var(--color-accent-blue);
    opacity: 0.3;
}

.step-number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: rgba(37, 99, 235, 0.1);
    border: 2px solid var(--color-accent-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--color-accent-gold);
}

.step-details h4 {
    font-size: 1.2rem;
    color: var(--color-text-light);
    margin-bottom: 6px;
}

.step-details p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

/* --- Key Benefits Section --- */
.benefits-section {
    padding: 100px 0;
    background-color: var(--color-primary-dark);
}

.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 60px auto;
}

.section-header span {
    font-family: var(--font-heading);
    color: var(--color-accent-blue);
    text-transform: uppercase;
    font-weight: 700;
    letter-spacing: 0.15em;
    font-size: 0.95rem;
    display: inline-block;
    margin-bottom: 12px;
}

.section-header h2 {
    font-size: 2.75rem;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--color-text-muted);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.benefit-card {
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--color-glass-border);
    border-radius: 12px;
    padding: 40px;
    transition: transform var(--transition-normal), border var(--transition-normal);
}

.benefit-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent-blue);
}

.benefit-card-head {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 20px;
}

.benefit-card-icon {
    width: 60px;
    height: 60px;
    background-color: rgba(37, 99, 235, 0.08);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(37, 99, 235, 0.2);
}

.benefit-card-icon svg {
    width: 32px;
    height: 32px;
    fill: var(--color-accent-blue);
}

.benefit-card-head h3 {
    font-size: 1.4rem;
    color: var(--color-text-light);
}

.benefit-card p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* --- Comprehensive Ingredients Segment --- */
.ingredients-section {
    padding: 100px 0;
    background-color: var(--color-primary-light);
}

.ingredients-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

.ingredient-card {
    background: var(--color-primary-dark);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 30px 24px;
    transition: transform var(--transition-normal), border var(--transition-normal), box-shadow var(--transition-normal);
}

.ingredient-card:hover {
    transform: translateY(-8px);
    border-color: rgba(37, 99, 235, 0.3);
    box-shadow: var(--shadow-md);
}

.ing-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: rgba(37, 99, 235, 0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    border: 1px solid rgba(37, 99, 235, 0.2);
}

.ing-icon svg {
    width: 24px;
    height: 24px;
    fill: var(--color-accent-blue);
}

.ingredient-card h4 {
    font-size: 1.2rem;
    color: var(--color-accent-gold);
    margin-bottom: 6px;
}

.ing-scientific {
    font-size: 0.8rem;
    font-style: italic;
    color: var(--color-text-muted);
    margin-bottom: 16px;
    display: block;
}

.ingredient-card p {
    font-size: 0.88rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* Regulatory E-E-A-T Panel */
.regulatory-panel {
    background: rgba(37, 99, 235, 0.04);
    border: 1px solid rgba(37, 99, 235, 0.15);
    border-radius: 12px;
    padding: 32px;
    max-width: 900px;
    margin: 60px auto 0 auto;
    text-align: center;
}

.regulatory-panel h4 {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: 12px;
    text-transform: uppercase;
}

.regulatory-panel p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* --- Comparison Matrix --- */
.matrix-section {
    padding: 100px 0;
    background-color: var(--color-primary-dark);
}

.matrix-table-wrap {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    overflow-x: auto;
    border: 1px solid var(--color-glass-border);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
}

table.matrix-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    background-color: var(--color-primary-light);
}

table.matrix-table th, table.matrix-table td {
    padding: 20px 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

table.matrix-table th {
    background-color: rgba(37, 99, 235, 0.1);
    font-family: var(--font-heading);
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--color-text-light);
}

table.matrix-table tr:hover td {
    background-color: rgba(255, 255, 255, 0.02);
}

table.matrix-table td.highlight {
    font-weight: 700;
    color: var(--color-accent-gold);
    background-color: rgba(37, 99, 235, 0.02);
}

table.matrix-table td svg.check-icon {
    width: 20px;
    height: 20px;
    fill: #22c55e;
}

table.matrix-table td svg.cross-icon {
    width: 20px;
    height: 20px;
    fill: #ef4444;
}

/* --- Customer Case Studies --- */
.studies-section {
    padding: 100px 0;
    background-color: var(--color-primary);
}

.studies-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.study-card {
    background: var(--color-primary-light);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    padding: 40px 32px;
    display: flex;
    flex-direction: column;
    position: relative;
}

.study-card-quote {
    font-size: 1.05rem;
    font-style: italic;
    color: var(--color-text-light);
    line-height: 1.6;
    margin-bottom: 24px;
    flex-grow: 1;
}

.study-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 20px;
}

.study-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--color-accent-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-heading);
    font-weight: 800;
    color: var(--color-text-light);
}

.study-author h5 {
    font-size: 1rem;
    color: var(--color-text-light);
}

.study-author span {
    font-size: 0.8rem;
    color: var(--color-accent-gold);
    font-weight: 600;
}

/* --- Pricing Section --- */
.pricing-section {
    padding: 100px 0;
    background-color: var(--color-primary-dark);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    align-items: stretch;
}

.pricing-card {
    background: var(--color-primary-light);
    border: 1px solid var(--color-glass-border);
    border-radius: 20px;
    padding: 48px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    transition: transform var(--transition-normal), border var(--transition-normal), box-shadow var(--transition-normal);
}

.pricing-card:hover {
    transform: translateY(-8px);
    border-color: rgba(37, 99, 235, 0.5);
    box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
    border: 2px solid var(--color-accent-gold);
    box-shadow: var(--shadow-glow);
}

.pricing-card.featured:hover {
    box-shadow: 0 0 45px 8px rgba(37, 99, 235, 0.3);
}

.card-badge {
    position: absolute;
    top: -16px;
    background: linear-gradient(135deg, var(--color-accent-amber), var(--color-accent-gold));
    color: var(--color-primary-dark);
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 6px 20px;
    border-radius: 30px;
}

.pricing-title {
    font-size: 1.6rem;
    text-transform: uppercase;
    color: var(--color-text-light);
    margin-bottom: 8px;
}

.pricing-quantity {
    font-size: 0.88rem;
    color: var(--color-accent-blue);
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 24px;
}

.pricing-image-container {
    width: 100%;
    max-width: 220px;
    height: 180px;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.pricing-image-container img {
    max-height: 100%;
    max-width: 100%;
    object-fit: contain;
}

.pricing-price-box {
    text-align: center;
    margin-bottom: 24px;
}

.price-subhead {
    font-size: 0.85rem;
    text-decoration: line-through;
    color: var(--color-text-muted);
    font-weight: 600;
    margin-bottom: 4px;
}

.price-main {
    font-family: var(--font-heading);
    font-size: 3.25rem;
    font-weight: 900;
    color: var(--color-text-light);
    line-height: 1;
}

.price-main span {
    font-size: 1.25rem;
    color: var(--color-accent-gold);
}

.price-shipping {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    font-weight: 500;
    margin-top: 6px;
}

.pricing-benefits-list {
    list-style: none;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 36px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding-top: 24px;
}

.pricing-benefit-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.92rem;
    color: var(--color-text-muted);
}

.pricing-benefit-item.highlight {
    font-weight: 700;
    color: var(--color-accent-gold);
}

.pricing-benefit-item svg {
    width: 16px;
    height: 16px;
    fill: var(--color-accent-blue);
    flex-shrink: 0;
}

.pricing-card .btn-cta {
    width: 100%;
}

.guarantee-banner {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: 32px;
    background: var(--color-primary-light);
    border: 1px solid var(--color-glass-border);
    border-radius: 20px;
    padding: 40px;
    align-items: center;
    max-width: 900px;
    margin: 80px auto 0 auto;
}

.guarantee-badge {
    width: 120px;
    height: 120px;
}

.guarantee-badge svg {
    width: 100%;
    height: 100%;
    fill: var(--color-accent-gold);
}

.guarantee-text h4 {
    font-size: 1.4rem;
    color: var(--color-accent-gold);
    text-transform: uppercase;
    margin-bottom: 8px;
}

.guarantee-text p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* --- Voice & AI FAQ Section --- */
.faq-section {
    padding: 100px 0;
    background-color: var(--color-primary);
}

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

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    background: var(--color-primary-light);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    overflow: hidden;
    transition: border var(--transition-normal);
}

.faq-item:hover {
    border-color: rgba(37, 99, 235, 0.2);
}

.faq-item.active {
    border-color: var(--color-accent-blue);
}

.faq-question {
    width: 100%;
    background: none;
    border: none;
    padding: 24px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-align: left;
    cursor: pointer;
    outline: none;
}

.faq-question h4 {
    font-family: var(--font-body);
    font-size: 1.08rem;
    font-weight: 600;
    color: var(--color-text-light);
    transition: color var(--transition-fast);
}

.faq-item.active .faq-question h4 {
    color: var(--color-accent-blue);
}

.faq-icon {
    width: 20px;
    height: 20px;
    position: relative;
    flex-shrink: 0;
}

.faq-icon::before, .faq-icon::after {
    content: '';
    position: absolute;
    background-color: var(--color-accent-blue);
    transition: transform var(--transition-normal);
}

.faq-icon::before {
    top: 9px; left: 2px;
    width: 16px; height: 2px;
}

.faq-icon::after {
    top: 2px; left: 9px;
    width: 2px; height: 16px;
}

.faq-item.active .faq-icon::after {
    transform: rotate(90deg);
    opacity: 0;
}

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

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

.faq-answer-inner {
    padding: 0 32px 24px 32px;
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.7;
    border-top: 1px solid rgba(255, 255, 255, 0.04);
    padding-top: 16px;
}

.faq-answer-inner p {
    margin-bottom: 12px;
}

.faq-answer-inner p:last-child {
    margin-bottom: 0;
}

/* --- FTC Footer & Legal Disclaimers --- */
footer {
    background-color: var(--color-primary-dark);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 80px 0 40px 0;
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.2fr 1.2fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-col h5 {
    font-family: var(--font-heading);
    color: var(--color-text-light);
    font-size: 1rem;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-col p {
    line-height: 1.6;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-link {
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.disclaimer-box {
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 8px;
    padding: 24px;
    margin-bottom: 40px;
    line-height: 1.6;
    background: rgba(255,255,255,0.01);
}

.disclaimer-box p {
    margin-bottom: 12px;
}

.disclaimer-box p:last-child {
    margin-bottom: 0;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 30px;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--color-text-light);
    text-decoration: none;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.15rem;
    text-transform: uppercase;
}

.footer-logo svg {
    width: 24px;
    height: 24px;
    fill: var(--color-accent-blue);
}

/* ==========================================================================
   MEDIA QUERIES - RESPONSIVE STYLES
   ========================================================================== */

@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        gap: 60px;
        text-align: center;
    }

    .hero-content {
        align-items: center;
    }

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

    .hero-description {
        max-width: 650px;
    }

    .science-intro-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

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

    .ingredients-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    .studies-grid {
        grid-template-columns: 1fr;
        gap: 32px;
        max-width: 500px;
        margin: 0 auto;
    }

    .pricing-grid {
        grid-template-columns: 1fr;
        gap: 48px;
        max-width: 480px;
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 15px;
    }

    .hero-title {
        font-size: 2.75rem;
    }

    .menu-toggle {
        display: block;
    }

    .nav-menu {
        position: fixed;
        top: 76px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 76px);
        background-color: var(--color-primary-dark);
        flex-direction: column;
        justify-content: center;
        gap: 40px;
        transition: left var(--transition-normal);
        z-index: 999;
        box-shadow: 0 10px 20px rgba(0,0,0,0.5);
    }

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

    .nav-link {
        font-size: 1.3rem;
    }

    header.scrolled .nav-menu {
        top: 61px;
        height: calc(100vh - 61px);
    }

    .guarantee-banner {
        grid-template-columns: 1fr;
        text-align: center;
        justify-items: center;
    }

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

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.2rem;
    }

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

    .hero-glow-ring {
        width: 280px;
        height: 280px;
    }
}