/* THE BRAIN SONG™ - Complete Stylesheet */

:root {
    --primary: #6366F1;
    --primary-light: #818CF8;
    --accent: #06B6D4;
    --bg-dark: #0B0B1A;
    --bg-card: #12122A;
    --white: #ffffff;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gradient-primary: linear-gradient(135deg, #6366F1 0%, #06B6D4 100%);
    --gradient-dark: linear-gradient(180deg, #0B0B1A 0%, #1a1a3e 100%);
    --gradient-card: linear-gradient(145deg, #1a1a3e 0%, #12122A 100%);
    --gradient-glow: radial-gradient(circle, rgba(99,102,241,0.3) 0%, transparent 70%);
    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-body: 'Inter', sans-serif;
    --space-xs: 0.5rem; --space-sm: 1rem; --space-md: 1.5rem; --space-lg: 2rem; --space-xl: 3rem; --space-3xl: 6rem;
    --radius-sm: 8px; --radius-md: 12px; --radius-lg: 20px; --radius-xl: 30px; --radius-full: 50%;
    --shadow-glow: 0 0 40px rgba(99,102,241,0.3);
    --shadow-lg: 0 10px 50px rgba(0,0,0,0.5);
    --transition-base: 0.3s ease;
    --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --container-max: 1200px;
    --container-padding: 20px;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; }
body { font-family: var(--font-body); font-size: 1rem; line-height: 1.7; color: var(--white); background: var(--bg-dark); overflow-x: hidden; }
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul { list-style: none; }
.container { width: 100%; max-width: var(--container-max); margin: 0 auto; padding: 0 var(--container-padding); }
.text-gradient { background: var(--gradient-primary); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.text-left { text-align: left; }

/* PRELOADER - FIXED */
.preloader { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: linear-gradient(135deg, #0B0B1A 0%, #1a1a3e 100%); z-index: 9999; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 20px; transition: opacity 0.5s ease, visibility 0.5s ease; }
.preloader.hidden { opacity: 0 !important; visibility: hidden !important; pointer-events: none !important; }
.preloader-brain { font-size: 60px; animation: brain-float 2s ease-in-out infinite; }
@keyframes brain-float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-15px); } }
.preloader-text { font-size: 12px; color: var(--gray-400); letter-spacing: 3px; text-transform: uppercase; }

/* Typography */
h1, h2, h3 { font-family: var(--font-display); font-weight: 600; line-height: 1.2; margin-bottom: var(--space-md); }
.section-title { font-size: 1.75rem; text-align: center; margin-bottom: var(--space-sm); }
.section-subtitle { text-align: center; color: var(--gray-400); font-size: 0.95rem; max-width: 600px; margin: 0 auto var(--space-xl); }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 12px; padding: 16px 32px; font-size: 1rem; font-weight: 600; border-radius: var(--radius-lg); transition: var(--transition-smooth); min-height: 52px; }
.btn:hover { transform: translateY(-3px); }
.btn-icon { font-size: 1.2rem; }

/* Header */
.header { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; background: rgba(11, 11, 26, 0.95); backdrop-filter: blur(20px); border-bottom: 1px solid rgba(99,102,241,0.1); }
.header.scrolled { box-shadow: 0 4px 30px rgba(0,0,0,0.3); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.nav-logo { display: flex; align-items: center; gap: 8px; }
.logo-icon { font-size: 1.5rem; }
.logo-text { font-family: var(--font-display); font-size: 1.3rem; font-weight: 600; }
.logo-accent { color: var(--accent); }
.logo-trademark { font-size: 0.6rem; color: var(--accent); vertical-align: super; }
.nav-menu { position: fixed; top: 70px; left: 0; width: 100%; height: calc(100vh - 70px); background: var(--bg-dark); padding: var(--space-lg); display: flex; flex-direction: column; gap: var(--space-lg); transform: translateX(-100%); transition: transform 0.4s ease; }
.nav-menu.active { transform: translateX(0); }
.nav-list { display: flex; flex-direction: column; gap: var(--space-md); }
.nav-link { font-size: 1.1rem; color: var(--gray-300); padding: var(--space-sm) 0; border-bottom: 1px solid rgba(255,255,255,0.1); }
.nav-link:hover { color: var(--accent); }
.nav-actions { display: flex; align-items: center; gap: var(--space-md); }
.btn-nav { background: var(--gradient-primary); color: var(--white); padding: 12px 24px; font-size: 0.85rem; border-radius: var(--radius-md); }
.btn-nav:hover { box-shadow: var(--shadow-glow); }
.desktop-cta { display: none; }
.mobile-cta { width: 100%; margin-top: auto; }
.nav-toggle { width: 44px; height: 44px; display: flex; align-items: center; justify-content: center; }
.hamburger { width: 24px; height: 2px; background: var(--white); position: relative; }
.hamburger::before, .hamburger::after { content: ''; position: absolute; width: 100%; height: 2px; background: var(--white); transition: var(--transition-base); }
.hamburger::before { top: -8px; }
.hamburger::after { bottom: -8px; }
.nav-toggle.active .hamburger { background: transparent; }
.nav-toggle.active .hamburger::before { transform: rotate(45deg); top: 0; }
.nav-toggle.active .hamburger::after { transform: rotate(-45deg); bottom: 0; }

/* Hero */
.hero { min-height: 100vh; padding: 100px 0 60px; position: relative; overflow: hidden; display: flex; align-items: center; }
.hero-bg { position: absolute; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none; }
.hero-gradient { position: absolute; top: 20%; left: 50%; width: 800px; height: 800px; background: var(--gradient-glow); transform: translate(-50%, -50%); animation: glow-pulse 4s ease-in-out infinite; }
@keyframes glow-pulse { 0%, 100% { opacity: 0.3; } 50% { opacity: 0.6; } }
.hero-container { display: flex; flex-direction: column; gap: var(--space-xl); position: relative; z-index: 1; }
.hero-image { display: flex; justify-content: center; order: 1; }
.hero-image-wrapper { position: relative; }
.hero-glow-ring { position: absolute; top: 50%; left: 50%; width: 280px; height: 280px; border: 2px solid rgba(99,102,241,0.3); border-radius: 50%; transform: translate(-50%, -50%); animation: ring-pulse 3s ease-in-out infinite; }
@keyframes ring-pulse { 0%, 100% { opacity: 0.5; } 50% { opacity: 1; } }
.hero-product { max-width: 250px; animation: float 6s ease-in-out infinite; filter: drop-shadow(0 20px 40px rgba(99,102,241,0.3)); }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-20px); } }
.hero-sound-waves { position: absolute; bottom: -30px; left: 50%; transform: translateX(-50%); display: flex; gap: 4px; align-items: flex-end; }
.hero-sound-waves span { width: 4px; background: var(--accent); border-radius: 2px; animation: wave 1s ease-in-out infinite; }
.hero-sound-waves span:nth-child(1) { height: 20px; }
.hero-sound-waves span:nth-child(2) { height: 35px; animation-delay: 0.1s; }
.hero-sound-waves span:nth-child(3) { height: 25px; animation-delay: 0.2s; }
.hero-sound-waves span:nth-child(4) { height: 40px; animation-delay: 0.3s; }
.hero-sound-waves span:nth-child(5) { height: 15px; animation-delay: 0.4s; }
@keyframes wave { 0%, 100% { transform: scaleY(1); } 50% { transform: scaleY(0.5); } }
.hero-badge { position: absolute; top: 0; right: -10px; background: var(--gradient-primary); padding: 8px 16px; border-radius: var(--radius-md); display: flex; align-items: center; gap: 6px; font-size: 0.75rem; font-weight: 600; }
.hero-content { text-align: center; order: 2; }
.hero-tag { display: inline-flex; align-items: center; gap: 10px; padding: 8px 20px; background: rgba(99,102,241,0.1); border: 1px solid rgba(99,102,241,0.3); border-radius: var(--radius-xl); font-size: 0.7rem; font-weight: 600; text-transform: uppercase; letter-spacing: 1.5px; color: var(--primary-light); margin-bottom: var(--space-md); }
.tag-pulse { width: 8px; height: 8px; background: var(--accent); border-radius: 50%; animation: pulse 2s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
.hero-title { font-size: 2rem; font-weight: 700; line-height: 1.15; margin-bottom: var(--space-md); }
.hero-description { margin-bottom: var(--space-lg); }
.hero-description p { color: var(--gray-300); margin-bottom: var(--space-sm); font-size: 0.95rem; }
.hero-stats { display: flex; justify-content: center; gap: var(--space-md); margin-bottom: var(--space-lg); flex-wrap: wrap; }
.stat-item { text-align: center; }
.stat-number { display: block; font-family: var(--font-display); font-size: 1.3rem; font-weight: 700; color: var(--accent); }
.stat-label { font-size: 0.7rem; color: var(--gray-400); text-transform: uppercase; }
.stat-divider { width: 1px; height: 40px; background: rgba(255,255,255,0.2); }
.btn-hero { width: 100%; background: var(--gradient-primary); color: var(--white); padding: 18px 30px; }
.btn-hero:hover { box-shadow: var(--shadow-glow); }
.btn-content { display: flex; flex-direction: column; align-items: flex-start; gap: 2px; }
.btn-text { font-size: 1rem; font-weight: 700; }
.btn-subtext { font-size: 0.7rem; opacity: 0.8; }
.hero-scroll { display: none; }

/* Trust Section */
.trust-section { padding: var(--space-3xl) 0; background: var(--gradient-dark); }
.trust-grid { display: grid; grid-template-columns: 1fr; gap: var(--space-md); }
.trust-card { background: var(--gradient-card); border: 1px solid rgba(99,102,241,0.1); border-radius: var(--radius-lg); padding: var(--space-lg); text-align: center; transition: var(--transition-smooth); }
.trust-card:hover { border-color: rgba(99,102,241,0.3); transform: translateY(-5px); }
.trust-icon { width: 70px; height: 70px; margin: 0 auto var(--space-md); }
.trust-icon img { width: 100%; height: 100%; object-fit: contain; }
.trust-card h3 { font-family: var(--font-display); font-size: 1.2rem; color: var(--accent); margin-bottom: var(--space-xs); }
.trust-card p { font-size: 0.85rem; color: var(--gray-400); }

/* What Is */
.what-is { padding: var(--space-3xl) 0; }
.what-is-grid { display: flex; flex-direction: column; gap: var(--space-xl); }
.what-is-content { order: 2; }
.what-is-text p { color: var(--gray-300); margin-bottom: var(--space-md); font-size: 0.95rem; }
.what-is-image { order: 1; display: flex; justify-content: center; position: relative; }
.image-frame { position: relative; max-width: 350px; }
.image-frame img { border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); }
.image-glow { position: absolute; top: 50%; left: 50%; width: 100%; height: 100%; background: var(--gradient-glow); transform: translate(-50%, -50%); z-index: -1; filter: blur(40px); }
.floating-feature { position: absolute; background: var(--bg-card); border: 1px solid rgba(99,102,241,0.2); padding: 10px 16px; border-radius: var(--radius-md); display: flex; align-items: center; gap: 8px; font-size: 0.8rem; font-weight: 600; animation: float 4s ease-in-out infinite; }
.feature-1 { top: 10%; right: -20px; }
.feature-2 { bottom: 20%; left: -20px; animation-delay: 1s; }

/* Accordion */
.how-it-works { padding: var(--space-3xl) 0; background: var(--gradient-dark); }
.accordion-container { max-width: 800px; margin: 0 auto; }
.accordion-item { background: var(--gradient-card); border: 1px solid rgba(99,102,241,0.1); border-radius: var(--radius-md); margin-bottom: var(--space-sm); overflow: hidden; }
.accordion-item.active { border-color: var(--primary); }
.accordion-header { width: 100%; display: flex; align-items: center; gap: var(--space-md); padding: var(--space-md); color: var(--white); text-align: left; cursor: pointer; min-height: 60px; }
.accordion-number { font-family: var(--font-display); font-size: 1.2rem; font-weight: 700; color: var(--accent); min-width: 35px; }
.accordion-title { flex: 1; font-size: 0.95rem; font-weight: 600; }
.accordion-icon { width: 24px; height: 24px; position: relative; }
.accordion-icon::before, .accordion-icon::after { content: ''; position: absolute; background: var(--primary); transition: var(--transition-base); }
.accordion-icon::before { width: 14px; height: 2px; top: 50%; left: 50%; transform: translate(-50%, -50%); }
.accordion-icon::after { width: 2px; height: 14px; top: 50%; left: 50%; transform: translate(-50%, -50%); }
.accordion-item.active .accordion-icon::after { opacity: 0; }
.accordion-content { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; }
.accordion-item.active .accordion-content { max-height: 300px; }
.accordion-content p { padding: 0 var(--space-md) var(--space-md) calc(var(--space-md) + 50px); color: var(--gray-300); font-size: 0.9rem; }

/* Reviews */
.reviews { padding: var(--space-3xl) 0; }
.reviews-grid { display: grid; grid-template-columns: 1fr; gap: var(--space-lg); }
.review-card { background: var(--gradient-card); border: 1px solid rgba(99,102,241,0.1); border-radius: var(--radius-lg); padding: var(--space-lg); position: relative; transition: var(--transition-smooth); }
.review-card:hover { transform: translateY(-5px); }
.review-card.featured { border-color: var(--accent); }
.review-quote { position: absolute; top: 15px; right: 20px; font-size: 4rem; font-family: var(--font-display); color: rgba(99,102,241,0.1); }
.review-header { display: flex; align-items: center; gap: var(--space-sm); margin-bottom: var(--space-md); }
.review-avatar { width: 60px; height: 60px; border-radius: 50%; overflow: hidden; border: 2px solid var(--accent); }
.review-avatar img { width: 100%; height: 100%; object-fit: cover; }
.reviewer-name { font-family: var(--font-display); font-size: 1.1rem; }
.reviewer-title { font-size: 0.75rem; color: var(--gray-400); }
.review-stars { color: #FCD34D; font-size: 0.9rem; margin-top: 4px; }
.review-text { font-size: 0.9rem; color: var(--gray-300); font-style: italic; margin-bottom: var(--space-sm); }
.review-verified { font-size: 0.7rem; color: var(--accent); font-weight: 600; }

/* Pricing */
.pricing { padding: var(--space-3xl) 0; background: var(--gradient-dark); }
.countdown-wrapper { text-align: center; margin-bottom: var(--space-xl); }
.countdown-label { font-size: 0.9rem; color: var(--accent); margin-bottom: var(--space-sm); }
.countdown-timer { display: inline-flex; align-items: center; gap: var(--space-sm); background: var(--bg-card); padding: var(--space-md) var(--space-lg); border-radius: var(--radius-lg); border: 1px solid var(--primary); }
.countdown-number { display: block; font-family: var(--font-display); font-size: 2.5rem; font-weight: 700; color: var(--accent); }
.countdown-text { font-size: 0.7rem; text-transform: uppercase; color: var(--gray-400); }
.countdown-separator { font-size: 2rem; color: var(--accent); animation: blink 1s infinite; }
@keyframes blink { 0%, 50% { opacity: 1; } 51%, 100% { opacity: 0.3; } }
.pricing-card-single { max-width: 500px; margin: 0 auto; background: var(--gradient-card); border: 2px solid var(--primary); border-radius: var(--radius-xl); padding: var(--space-xl); text-align: center; position: relative; }
.pricing-ribbon { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--gradient-primary); color: var(--white); padding: 8px 24px; font-size: 0.75rem; font-weight: 700; text-transform: uppercase; border-radius: var(--radius-xl); }
.pricing-image { margin-bottom: var(--space-lg); position: relative; }
.pricing-image img { max-width: 180px; margin: 0 auto; }
.pricing-glow { position: absolute; top: 50%; left: 50%; width: 200px; height: 200px; background: var(--gradient-glow); transform: translate(-50%, -50%); z-index: -1; filter: blur(30px); }
.pricing-content h3 { font-family: var(--font-display); font-size: 1.5rem; }
.pricing-includes { font-size: 0.85rem; color: var(--gray-400); margin-bottom: var(--space-md); }
.price-original { font-size: 1.5rem; color: var(--gray-500); text-decoration: line-through; margin-right: var(--space-sm); }
.price-current { font-size: 3rem; font-family: var(--font-display); font-weight: 700; color: var(--accent); }
.pricing-savings { font-size: 0.9rem; color: var(--accent); font-weight: 600; margin-bottom: var(--space-lg); }
.btn-pricing { width: 100%; background: var(--gradient-primary); color: var(--white); padding: 18px 30px; font-size: 1.1rem; margin-bottom: var(--space-md); }
.pricing-features { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--space-sm); margin-bottom: var(--space-md); }
.pricing-features span { font-size: 0.8rem; color: var(--gray-300); }
.pricing-rating { max-width: 150px; margin: 0 auto; }

/* Science */
.science { padding: var(--space-3xl) 0; }
.science-grid { display: grid; grid-template-columns: 1fr; gap: var(--space-md); }
.science-card { background: var(--gradient-card); border: 1px solid rgba(99,102,241,0.1); border-radius: var(--radius-lg); padding: var(--space-lg); }
.science-card:hover { transform: translateY(-5px); }
.science-icon { font-size: 2.5rem; margin-bottom: var(--space-sm); }
.science-card h3 { font-family: var(--font-display); font-size: 1.2rem; color: var(--accent); }
.science-card p { font-size: 0.9rem; color: var(--gray-300); }

/* Guarantee */
.guarantee { padding: var(--space-3xl) 0; background: var(--gradient-dark); }
.guarantee-grid { display: flex; flex-direction: column; gap: var(--space-xl); align-items: center; }
.guarantee-image { max-width: 220px; }
.guarantee-image img { width: 100%; }
.guarantee-content { text-align: center; }
.guarantee-intro { color: var(--gray-300); margin-bottom: var(--space-lg); }
.guarantee-points { display: flex; flex-direction: column; gap: var(--space-lg); }
.guarantee-point { display: flex; flex-direction: column; align-items: center; text-align: center; gap: var(--space-sm); }
.point-icon { font-size: 2.5rem; }
.point-content h3 { font-family: var(--font-display); font-size: 1.1rem; color: var(--accent); }
.point-content p { font-size: 0.9rem; color: var(--gray-300); }

/* Benefits */
.benefits { padding: var(--space-3xl) 0; }
.benefits-grid { display: grid; grid-template-columns: 1fr; gap: var(--space-md); max-width: 900px; margin: 0 auto; }
.benefit-item { display: flex; gap: var(--space-md); padding: var(--space-lg); background: var(--gradient-card); border: 1px solid rgba(99,102,241,0.1); border-radius: var(--radius-lg); }
.benefit-item:hover { transform: translateX(5px); }
.benefit-icon { font-size: 2rem; flex-shrink: 0; }
.benefit-content h3 { font-family: var(--font-display); font-size: 1.1rem; }
.benefit-content p { font-size: 0.9rem; color: var(--gray-300); }

/* Urgency CTA */
.urgency-cta { padding: var(--space-3xl) 0; background: linear-gradient(135deg, rgba(99,102,241,0.1) 0%, rgba(6,182,212,0.1) 100%); }
.urgency-wrapper { text-align: center; max-width: 700px; margin: 0 auto; }
.urgency-icon { font-size: 3rem; margin-bottom: var(--space-sm); }
.urgency-wrapper h2 { font-family: var(--font-display); font-size: 1.75rem; }
.urgency-wrapper > p { color: var(--gray-300); margin-bottom: var(--space-lg); }
.urgency-stats { display: flex; justify-content: center; gap: var(--space-lg); flex-wrap: wrap; margin-bottom: var(--space-lg); }
.stat-num { display: block; font-family: var(--font-display); font-size: 2rem; font-weight: 700; color: var(--accent); }
.stat-desc { font-size: 0.8rem; color: var(--gray-400); }
.btn-urgency { background: var(--gradient-primary); color: var(--white); padding: 18px 40px; margin-bottom: var(--space-md); }
.urgency-subtext { font-size: 0.85rem; color: var(--gray-400); }

/* FAQ */
.faq { padding: var(--space-3xl) 0; background: var(--gradient-dark); }
.faq-container { max-width: 800px; margin: 0 auto; }
.faq-item { background: var(--gradient-card); border: 1px solid rgba(99,102,241,0.1); border-radius: var(--radius-md); margin-bottom: var(--space-sm); overflow: hidden; }
.faq-question { width: 100%; display: flex; align-items: center; justify-content: space-between; padding: var(--space-md); color: var(--white); text-align: left; cursor: pointer; min-height: 60px; font-size: 0.95rem; font-weight: 600; }
.faq-icon { width: 24px; height: 24px; position: relative; }
.faq-icon::before, .faq-icon::after { content: ''; position: absolute; background: var(--primary); transition: var(--transition-base); }
.faq-icon::before { width: 14px; height: 2px; top: 50%; left: 50%; transform: translate(-50%, -50%); }
.faq-icon::after { width: 2px; height: 14px; top: 50%; left: 50%; transform: translate(-50%, -50%); }
.faq-item.active .faq-icon::after { opacity: 0; }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; }
.faq-item.active .faq-answer { max-height: 400px; }
.faq-answer p { padding: 0 var(--space-md) var(--space-md); color: var(--gray-300); font-size: 0.9rem; }

/* Final CTA */
.final-cta { padding: var(--space-3xl) 0; position: relative; overflow: hidden; }
.final-cta .hero-bg { opacity: 0.5; }
.final-cta-wrapper { display: flex; flex-direction: column; align-items: center; gap: var(--space-xl); text-align: center; position: relative; z-index: 1; }
.final-cta-image { max-width: 280px; animation: float 6s ease-in-out infinite; }
.final-cta-image img { border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); }
.cta-glow { position: absolute; top: 50%; left: 50%; width: 300px; height: 300px; background: var(--gradient-glow); transform: translate(-50%, -50%); z-index: -1; filter: blur(40px); }
.final-cta-content h2 { font-family: var(--font-display); font-size: 2rem; }
.final-subtitle { font-size: 1.1rem; color: var(--gray-300); margin-bottom: var(--space-lg); }
.final-original { color: var(--gray-500); }
.final-original span { text-decoration: line-through; }
.final-current { font-size: 1.3rem; font-weight: 600; margin-bottom: var(--space-lg); }
.final-current span { font-family: var(--font-display); font-size: 2.5rem; }
.btn-final { background: var(--gradient-primary); color: var(--white); padding: 20px 40px; }
.final-trust { display: flex; flex-direction: column; gap: var(--space-xs); margin-top: var(--space-lg); font-size: 0.8rem; color: var(--gray-400); }

/* Footer */
.footer { padding: var(--space-xl) 0 var(--space-lg); background: var(--bg-card); }
.footer-grid { display: flex; flex-direction: column; gap: var(--space-lg); text-align: center; margin-bottom: var(--space-xl); }
.footer-brand { display: flex; align-items: center; justify-content: center; gap: 8px; flex-wrap: wrap; }
.footer-tagline { width: 100%; font-size: 0.85rem; color: var(--gray-500); margin-top: var(--space-xs); }
.footer-links h4, .footer-social h4 { font-family: var(--font-display); color: var(--accent); margin-bottom: var(--space-sm); }
.footer-links ul { display: flex; flex-direction: column; gap: var(--space-xs); }
.footer-links a { font-size: 0.9rem; color: var(--gray-400); }
.footer-links a:hover { color: var(--accent); }
.social-icons { display: flex; justify-content: center; gap: var(--space-md); }
.social-link { width: 44px; height: 44px; display: flex; align-items: center; justify-content: center; background: rgba(99,102,241,0.1); border-radius: 50%; color: var(--primary-light); }
.social-link:hover { background: var(--primary); color: var(--white); }
.footer-disclaimer { padding: var(--space-lg); background: rgba(0,0,0,0.3); border-radius: var(--radius-md); margin-bottom: var(--space-lg); }
.footer-disclaimer p { font-size: 0.75rem; color: var(--gray-500); }
.footer-bottom { text-align: center; padding-top: var(--space-md); border-top: 1px solid rgba(255,255,255,0.1); }
.footer-bottom p { font-size: 0.8rem; color: var(--gray-500); }

/* Popup & Scroll Top */
.purchase-popup { position: fixed; bottom: 20px; left: 20px; right: 20px; background: var(--bg-card); border: 1px solid var(--primary); border-radius: var(--radius-lg); padding: var(--space-md); z-index: 900; transform: translateY(150%); transition: transform 0.5s ease; }
.purchase-popup.show { transform: translateY(0); }
.popup-content { display: flex; align-items: center; gap: var(--space-sm); }
.popup-icon { font-size: 1.5rem; }
.popup-text { font-size: 0.85rem; color: var(--gray-300); }
.popup-text strong { color: var(--accent); }
.scroll-top { position: fixed; bottom: 80px; right: 20px; width: 56px; height: 56px; background: var(--gradient-primary); color: var(--white); border-radius: 50%; display: flex; align-items: center; justify-content: center; z-index: 800; opacity: 0; visibility: hidden; transform: translateY(20px); transition: var(--transition-smooth); }
.scroll-top.show { opacity: 1; visibility: visible; transform: translateY(0); }

/* Responsive */
@media (min-width: 576px) {
    .trust-grid { grid-template-columns: repeat(3, 1fr); }
    .reviews-grid { grid-template-columns: repeat(2, 1fr); }
    .science-grid { grid-template-columns: repeat(2, 1fr); }
    .benefits-grid { grid-template-columns: repeat(2, 1fr); }
    .final-trust { flex-direction: row; justify-content: center; gap: var(--space-md); }
    .purchase-popup { left: auto; right: 20px; max-width: 350px; }
}

@media (min-width: 768px) {
    .nav-menu { position: static; height: auto; width: auto; background: transparent; padding: 0; flex-direction: row; transform: none; gap: var(--space-lg); }
    .nav-list { flex-direction: row; gap: var(--space-lg); }
    .nav-link { font-size: 0.9rem; padding: 0; border: none; }
    .desktop-cta { display: inline-flex; }
    .mobile-cta { display: none; }
    .nav-toggle { display: none; }
    .section-title { font-size: 2.25rem; }
    .hero-title { font-size: 2.5rem; }
    .hero-container { flex-direction: row; align-items: center; }
    .hero-image { order: 1; flex: 1; }
    .hero-content { order: 2; flex: 1; text-align: left; }
    .hero-stats { justify-content: flex-start; }
    .btn-hero { width: auto; }
    .hero-product { max-width: 350px; }
    .what-is-grid { flex-direction: row; align-items: center; }
    .what-is-content { order: 1; flex: 1; }
    .what-is-image { order: 2; flex: 1; }
    .reviews-grid { grid-template-columns: repeat(3, 1fr); }
    .guarantee-grid { flex-direction: row; text-align: left; }
    .guarantee-content { text-align: left; }
    .guarantee-point { flex-direction: row; text-align: left; }
    .final-cta-wrapper { flex-direction: row; text-align: left; }
    .btn-final { width: auto; }
    .footer-grid { flex-direction: row; justify-content: space-between; text-align: left; }
    .footer-brand { justify-content: flex-start; }
    .social-icons { justify-content: flex-start; }
}

@media (min-width: 1024px) {
    .section-title { font-size: 2.5rem; }
    .hero { padding: 120px 0 80px; }
    .hero-title { font-size: 3rem; }
    .hero-product { max-width: 400px; }
    .science-grid { grid-template-columns: repeat(4, 1fr); }
}