/* ============================================
   ZenSulin™ - Medical Professional Theme
   Mobile-First Responsive Design
   ============================================ */

/* === CSS VARIABLES === */
:root {
  --primary: #0F4C81;
  --primary-dark: #0A3660;
  --primary-light: #1A6BB5;
  --accent: #00A878;
  --accent-dark: #008F66;
  --accent-light: #00C48C;
  --gold: #D4A843;
  --gold-light: #E8C96A;
  --navy: #0B1D33;
  --dark: #111827;
  --gray-900: #1F2937;
  --gray-800: #374151;
  --gray-700: #4B5563;
  --gray-600: #6B7280;
  --gray-500: #9CA3AF;
  --gray-400: #D1D5DB;
  --gray-300: #E5E7EB;
  --gray-200: #F3F4F6;
  --gray-100: #F9FAFB;
  --white: #FFFFFF;
  --red: #DC2626;
  --bg-section-alt: #F0F7FF;
  --bg-dark-section: #0B1D33;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body: 'DM Sans', 'Segoe UI', sans-serif;
}

/* === RESET & BASE === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

* {
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-body);
  color: var(--gray-800);
  line-height: 1.7;
  background: var(--white);
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--navy);
  line-height: 1.25;
  font-weight: 700;
}

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

.section-padding {
  padding: 50px 0;
}

.section-heading {
  font-size: 24px;
  text-align: center;
  margin-bottom: 16px;
  position: relative;
}

.section-heading span {
  color: var(--primary);
}

.section-subtext {
  text-align: center;
  color: var(--gray-600);
  font-size: 16px;
  max-width: 700px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.heading-line {
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 2px;
  margin: 12px auto 24px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: var(--white);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  padding: 16px 32px;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  min-height: 48px;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(0, 168, 120, 0.35);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  position: relative;
  overflow: hidden;
}

.btn-primary::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s;
}

.btn-primary:hover::after {
  left: 100%;
}

.btn-primary:hover {
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 8px 30px rgba(0, 168, 120, 0.45);
}

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

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--white);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  padding: 16px 32px;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  min-height: 48px;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(15, 76, 129, 0.35);
  letter-spacing: 0.5px;
}

.btn-secondary:hover {
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 8px 30px rgba(15, 76, 129, 0.45);
}

/* === NAVIGATION === */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(15, 76, 129, 0.08);
  transition: var(--transition);
  padding: 12px 0;
}

.navbar.scrolled {
  padding: 6px 0;
  box-shadow: var(--shadow-md);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 700;
  color: var(--primary);
}

.nav-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 18px;
  font-weight: 800;
}

.nav-logo .tm {
  font-size: 10px;
  vertical-align: super;
  color: var(--accent);
}

.nav-links {
  display: none;
  gap: 28px;
  align-items: center;
}

.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: var(--gray-700);
  transition: var(--transition);
  position: relative;
}

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

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

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

.nav-cta {
  display: none;
}

.nav-cta .btn-primary {
  padding: 10px 24px;
  font-size: 14px;
}

.hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  z-index: 1002;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2.5px;
  background: var(--navy);
  border-radius: 2px;
  transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}

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

.hamburger.active span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

.mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 80%;
  max-width: 320px;
  height: 100vh;
  height: 100dvh;
  background: var(--white);
  z-index: 1001;
  transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  padding: 80px 24px 40px;
  box-shadow: -10px 0 40px rgba(0,0,0,0.15);
  display: flex;
  flex-direction: column;
  gap: 0;
  overflow-y: auto;
}

.mobile-menu.open {
  right: 0;
}

.mobile-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}

.mobile-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.mobile-menu a {
  display: block;
  padding: 16px 0;
  font-size: 17px;
  font-weight: 500;
  color: var(--gray-800);
  border-bottom: 1px solid var(--gray-300);
  transition: var(--transition);
}

.mobile-menu a:hover {
  color: var(--primary);
  padding-left: 8px;
}

.mobile-menu .btn-primary {
  margin-top: 24px;
  width: 100%;
  text-align: center;
}

/* === HERO SECTION === */
.hero {
  padding-top: 80px;
  background: linear-gradient(170deg, #F0F7FF 0%, #E8F4FD 40%, #FFFFFF 100%);
  position: relative;
  overflow: hidden;
  min-height: auto;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -30%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0,168,120,0.06) 0%, transparent 70%);
  border-radius: 50%;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -20%;
  left: -20%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(15,76,129,0.05) 0%, transparent 70%);
  border-radius: 50%;
}

.hero-grid {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 30px;
  padding: 40px 0 50px;
  position: relative;
  z-index: 1;
}

.hero-image {
  width: 100%;
  max-width: 340px;
  position: relative;
}

.hero-image img {
  width: 100%;
  animation: heroFloat 4s ease-in-out infinite;
  filter: drop-shadow(0 20px 40px rgba(15, 76, 129, 0.2));
}

@keyframes heroFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-14px); }
}

.hero-image .hero-badge {
  position: absolute;
  bottom: 10px;
  right: -5px;
  background: var(--accent);
  color: var(--white);
  font-size: 12px;
  font-weight: 700;
  padding: 8px 16px;
  border-radius: 30px;
  box-shadow: var(--shadow-md);
  animation: badgePulse 2s ease-in-out infinite;
}

@keyframes badgePulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.06); }
}

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

.hero-content .hero-tag {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: var(--white);
  font-size: 12px;
  font-weight: 700;
  padding: 6px 16px;
  border-radius: 30px;
  margin-bottom: 16px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.hero-content h1 {
  font-size: 26px;
  margin-bottom: 18px;
  color: var(--navy);
  line-height: 1.2;
}

.hero-content h1 .highlight {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-content .hero-desc {
  font-size: 16px;
  color: var(--gray-700);
  margin-bottom: 22px;
  line-height: 1.7;
}

.hero-benefits {
  text-align: left;
  margin-bottom: 28px;
}

.hero-benefits li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 0;
  font-size: 15px;
  color: var(--gray-800);
}

.hero-benefits li .emoji {
  font-size: 18px;
  flex-shrink: 0;
  margin-top: 1px;
}

.hero-cta-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.hero-cta-wrap .btn-primary {
  width: 100%;
  font-size: 17px;
  padding: 18px 30px;
}

.hero-cta-wrap .cta-subtext {
  font-size: 13px;
  color: var(--gray-500);
  display: flex;
  align-items: center;
  gap: 6px;
}

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

.trust-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.trust-card {
  background: var(--gray-100);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-md);
  padding: 20px 16px;
  text-align: center;
  transition: var(--transition);
}

.trust-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.trust-card img {
  width: 52px;
  height: 52px;
  margin: 0 auto 10px;
  object-fit: contain;
}

.trust-card h3 {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 6px;
}

.trust-card p {
  font-size: 13px;
  color: var(--gray-600);
  line-height: 1.5;
}

/* === SUPERIOR FORMULA SECTION === */
.superior-formula {
  background: var(--bg-section-alt);
}

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

.formula-card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  box-shadow: var(--shadow-sm);
  border-left: 4px solid var(--primary);
  transition: var(--transition);
}

.formula-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.formula-card .card-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: var(--white);
  font-size: 16px;
  font-weight: 800;
  border-radius: 50%;
  margin-bottom: 12px;
}

.formula-card h3 {
  font-family: var(--font-body);
  font-size: 18px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 8px;
}

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

/* === WHAT IS SECTION === */
.what-is {
  background: var(--white);
}

.what-is-grid {
  display: flex;
  flex-direction: column;
  gap: 30px;
  align-items: center;
}

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

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

.what-is-content {
  text-align: left;
}

.what-is-content h2 {
  font-size: 24px;
  margin-bottom: 20px;
  text-align: center;
}

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

.what-is-content .btn-primary {
  margin-top: 12px;
}

/* === HOW IT WORKS === */
.how-works {
  background: var(--bg-dark-section);
  color: var(--white);
}

.how-works .section-heading {
  color: var(--white);
}

.how-works .section-subtext {
  color: var(--gray-400);
}

.how-works .heading-line {
  background: linear-gradient(90deg, var(--accent), var(--gold));
}

.steps-container {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}

.steps-container::before {
  content: '';
  position: absolute;
  left: 22px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: rgba(0, 168, 120, 0.3);
}

.step-item {
  display: flex;
  gap: 20px;
  padding: 24px 0;
  opacity: 0;
  transform: translateX(-20px);
  transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.step-item.visible {
  opacity: 1;
  transform: translateX(0);
}

.step-num {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--accent), var(--primary));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 800;
  color: var(--white);
  z-index: 1;
  box-shadow: 0 0 20px rgba(0, 168, 120, 0.4);
}

.step-content h3 {
  font-family: var(--font-body);
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
}

.step-content p {
  font-size: 15px;
  color: var(--gray-400);
  line-height: 1.7;
}

/* === REVIEWS === */
.reviews {
  background: var(--bg-section-alt);
}

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

.review-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-300);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.review-card::before {
  content: '\201C';
  position: absolute;
  top: 10px;
  right: 16px;
  font-size: 60px;
  color: rgba(15, 76, 129, 0.07);
  font-family: Georgia, serif;
  line-height: 1;
}

.review-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.review-header img {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--accent);
}

.review-meta h4 {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  color: var(--navy);
}

.review-meta span {
  font-size: 13px;
  color: var(--gray-500);
}

.review-stars {
  color: #F59E0B;
  font-size: 16px;
  margin-bottom: 10px;
  letter-spacing: 2px;
}

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

.review-verified {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: var(--accent);
  font-weight: 600;
  margin-top: 10px;
  font-style: normal;
}

/* === SCIENCE FORMULA SECTION === */
.science-formula {
  background: var(--white);
}

.science-formula .science-text {
  font-size: 16px;
  color: var(--gray-700);
  line-height: 1.8;
  margin-bottom: 20px;
  text-align: center;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.science-bullets {
  max-width: 700px;
  margin: 0 auto 30px;
}

.science-bullets li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 0;
  font-size: 15px;
  color: var(--gray-700);
}

.science-bullets li .check-icon {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  background: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 12px;
  margin-top: 2px;
}

/* === PRICING SECTION === */
.pricing {
  background: linear-gradient(170deg, #0B1D33 0%, #0F4C81 100%);
  color: var(--white);
  text-align: center;
}

.pricing .section-heading {
  color: var(--white);
}

.pricing .section-subtext {
  color: var(--gray-400);
}

.pricing .heading-line {
  background: linear-gradient(90deg, var(--gold), var(--accent));
}

.countdown-wrap {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 30px;
}

.countdown-box {
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  min-width: 70px;
  text-align: center;
}

.countdown-box .num {
  font-size: 32px;
  font-weight: 800;
  color: var(--gold);
  font-family: var(--font-body);
  line-height: 1;
}

.countdown-box .label {
  font-size: 11px;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 4px;
}

.pricing-image {
  max-width: 100%;
  margin: 0 auto;
  cursor: pointer;
  transition: var(--transition);
}

.pricing-image:hover {
  transform: scale(1.02);
}

.pricing-image img {
  width: 100%;
  border-radius: var(--radius-md);
}

.pricing-urgency {
  margin-top: 20px;
  font-size: 14px;
  color: var(--gold);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

/* === INGREDIENTS === */
.ingredients {
  background: var(--bg-section-alt);
}

.ingredients-intro {
  text-align: center;
  font-size: 16px;
  color: var(--gray-700);
  max-width: 700px;
  margin: 0 auto 30px;
  line-height: 1.7;
}

.ingredient-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.ingredient-card {
  background: var(--white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-300);
}

.ingredient-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  cursor: pointer;
  min-height: 48px;
  transition: var(--transition);
}

.ingredient-header:hover {
  background: var(--gray-100);
}

.ingredient-header h3 {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  color: var(--navy);
  display: flex;
  align-items: center;
  gap: 10px;
}

.ingredient-header .ing-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}

.ingredient-header .toggle-icon {
  font-size: 20px;
  color: var(--primary);
  transition: transform 0.3s;
  flex-shrink: 0;
}

.ingredient-header.active .toggle-icon {
  transform: rotate(180deg);
}

.ingredient-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.ingredient-body-inner {
  padding: 0 20px 20px;
  font-size: 15px;
  color: var(--gray-700);
  line-height: 1.7;
}

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

.study-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.study-card {
  background: var(--gray-100);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--gray-300);
}

.study-header {
  padding: 16px 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 48px;
  transition: var(--transition);
}

.study-header:hover {
  background: var(--gray-200);
}

.study-header h3 {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 600;
  color: var(--navy);
}

.study-header .toggle-icon {
  font-size: 20px;
  color: var(--primary);
  transition: transform 0.3s;
}

.study-header.active .toggle-icon {
  transform: rotate(180deg);
}

.study-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.study-body-inner {
  padding: 0 20px 20px;
  font-size: 15px;
  color: var(--gray-700);
  line-height: 1.7;
}

.study-ref {
  font-size: 13px;
  color: var(--primary);
  font-style: italic;
  margin-top: 8px;
  display: block;
}

/* === GUARANTEE === */
.guarantee {
  background: linear-gradient(170deg, #F0F7FF 0%, #E8F8F0 100%);
}

.guarantee-grid {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 30px;
}

.guarantee-image {
  width: 180px;
}

.guarantee-image img {
  width: 100%;
  filter: drop-shadow(0 8px 24px rgba(0,0,0,0.12));
}

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

.guarantee-content h2 {
  font-size: 24px;
  margin-bottom: 16px;
}

.guarantee-content > p {
  font-size: 16px;
  color: var(--gray-700);
  margin-bottom: 20px;
  line-height: 1.7;
}

.guarantee-points {
  display: flex;
  flex-direction: column;
  gap: 16px;
  text-align: left;
}

.guarantee-point {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px;
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.guarantee-point .gp-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent), var(--primary));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 18px;
  flex-shrink: 0;
}

.guarantee-point h4 {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 4px;
}

.guarantee-point p {
  font-size: 14px;
  color: var(--gray-600);
  line-height: 1.6;
}

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

.benefits-intro {
  text-align: center;
  font-size: 16px;
  color: var(--gray-700);
  max-width: 700px;
  margin: 0 auto 30px;
  line-height: 1.7;
}

.benefits-list {
  max-width: 700px;
  margin: 0 auto;
}

.benefit-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--gray-200);
}

.benefit-item:last-child {
  border-bottom: none;
}

.benefit-item .b-check {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, var(--accent), #00C48C);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 14px;
  margin-top: 2px;
}

.benefit-item p {
  font-size: 16px;
  color: var(--gray-700);
  line-height: 1.6;
}

.benefit-item p strong {
  color: var(--navy);
}

/* === PROS & CONS === */
.pros-cons {
  background: var(--bg-section-alt);
}

.pros-cons-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  max-width: 700px;
  margin: 0 auto;
}

.pros-box, .cons-box {
  border-radius: var(--radius-md);
  padding: 24px 20px;
}

.pros-box {
  background: #E8F8F0;
  border: 1px solid #A7F3D0;
}

.cons-box {
  background: #FEF2F2;
  border: 1px solid #FECACA;
}

.pros-box h3, .cons-box h3 {
  font-family: var(--font-body);
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.pros-box h3 { color: var(--accent-dark); }
.cons-box h3 { color: var(--red); }

.pros-box li, .cons-box li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 0;
  font-size: 15px;
  color: var(--gray-700);
}

.pros-box li .icon { color: var(--accent); font-weight: 700; }
.cons-box li .icon { color: var(--red); font-weight: 700; }

/* === WHERE TO BUY === */
.where-to-buy {
  background: var(--white);
}

.where-to-buy-content {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.where-to-buy-content p {
  font-size: 16px;
  color: var(--gray-700);
  line-height: 1.8;
  margin-bottom: 16px;
}

/* === ORDER GUIDE === */
.order-guide {
  background: var(--bg-section-alt);
}

.order-grid {
  display: flex;
  flex-direction: column;
  gap: 30px;
  align-items: center;
}

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

.order-image img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

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

.order-steps {
  margin-bottom: 24px;
}

.order-step {
  display: flex;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--gray-300);
}

.order-step:last-child {
  border-bottom: none;
}

.order-step .os-num {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background: var(--primary);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 800;
}

.order-step h4 {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 4px;
}

.order-step p {
  font-size: 14px;
  color: var(--gray-600);
  line-height: 1.6;
}

.order-content > p {
  font-size: 15px;
  color: var(--gray-700);
  line-height: 1.7;
  margin-bottom: 14px;
}

/* === FAQ === */
.faq {
  background: var(--white);
}

.faq-list {
  max-width: 780px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--gray-100);
  border-radius: var(--radius-md);
  border: 1px solid var(--gray-300);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item.active {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  cursor: pointer;
  min-height: 48px;
  font-size: 16px;
  font-weight: 600;
  color: var(--navy);
  transition: var(--transition);
}

.faq-question:hover {
  background: var(--gray-200);
}

.faq-question .faq-toggle {
  font-size: 22px;
  color: var(--primary);
  transition: transform 0.3s;
  flex-shrink: 0;
  margin-left: 12px;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq-answer-inner {
  padding: 0 20px 20px;
  font-size: 15px;
  color: var(--gray-700);
  line-height: 1.7;
}

/* === FINAL CTA === */
.final-cta {
  background: linear-gradient(170deg, #0B1D33 0%, #0F4C81 100%);
  color: var(--white);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.final-cta::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -30%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0,168,120,0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.final-cta-inner {
  position: relative;
  z-index: 1;
}

.final-cta-image {
  max-width: 320px;
  margin: 0 auto 30px;
}

.final-cta-image img {
  width: 100%;
  animation: heroFloat 4s ease-in-out infinite;
  filter: drop-shadow(0 20px 40px rgba(0,0,0,0.3));
}

.final-cta h2 {
  font-size: 24px;
  color: var(--white);
  margin-bottom: 16px;
}

.final-price {
  margin-bottom: 24px;
}

.final-price .old-price {
  font-size: 22px;
  color: var(--gray-500);
  text-decoration: line-through;
  margin-right: 12px;
}

.final-price .new-price {
  font-size: 32px;
  font-weight: 800;
  color: var(--gold);
  font-family: var(--font-body);
}

.final-cta .btn-primary {
  font-size: 18px;
  padding: 20px 40px;
  width: 100%;
  max-width: 400px;
}

.final-cta .cta-note {
  font-size: 13px;
  color: var(--gray-400);
  margin-top: 14px;
}

/* === FOOTER === */
.footer {
  background: var(--navy);
  color: var(--gray-400);
  padding: 40px 0 20px;
}

.footer-grid {
  display: flex;
  flex-direction: column;
  gap: 30px;
  margin-bottom: 30px;
}

.footer-brand .nav-logo {
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--gray-500);
}

.footer-links h4 {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 14px;
}

.footer-links a {
  display: block;
  font-size: 14px;
  color: var(--gray-500);
  padding: 5px 0;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--accent);
  padding-left: 4px;
}

.footer-social {
  display: flex;
  gap: 12px;
}

.footer-social a {
  width: 40px;
  height: 40px;
  background: rgba(255,255,255,0.08);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--gray-400);
  transition: var(--transition);
}

.footer-social a:hover {
  background: var(--accent);
  color: var(--white);
}

.footer-disclaimer {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 20px;
  font-size: 12px;
  color: var(--gray-600);
  line-height: 1.6;
  text-align: center;
}

.footer-copyright {
  text-align: center;
  font-size: 13px;
  color: var(--gray-500);
  margin-top: 16px;
}

/* === SCROLL TO TOP === */
.scroll-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: var(--white);
  border: none;
  border-radius: 50%;
  font-size: 20px;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 998;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.scroll-top:hover {
  background: var(--accent);
  transform: translateY(-3px);
}

/* === NOTIFICATION POPUP === */
.notification-popup {
  position: fixed;
  bottom: 20px;
  left: 20px;
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  box-shadow: var(--shadow-xl);
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 997;
  max-width: 320px;
  transform: translateX(-120%);
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  border-left: 4px solid var(--accent);
}

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

.notification-popup .notif-icon {
  width: 36px;
  height: 36px;
  background: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 16px;
  flex-shrink: 0;
}

.notification-popup .notif-text {
  font-size: 13px;
  color: var(--gray-700);
  line-height: 1.4;
}

.notification-popup .notif-text strong {
  color: var(--navy);
}

.notification-popup .notif-text .notif-time {
  font-size: 11px;
  color: var(--gray-500);
  display: block;
  margin-top: 2px;
}

/* === FADE IN ANIMATIONS === */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .fade-in { opacity: 1; transform: none; }
  .step-item { opacity: 1; transform: none; }
  .hero-image img { animation: none; }
  .final-cta-image img { animation: none; }
}

/* ============================================
   RESPONSIVE BREAKPOINTS (Mobile-First)
   ============================================ */

/* Tablets (576px+) */
@media (min-width: 576px) {
  .section-heading { font-size: 28px; }
  .hero-content h1 { font-size: 30px; }
  .trust-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .reviews-grid { grid-template-columns: repeat(2, 1fr); }
  .ingredient-grid { grid-template-columns: repeat(2, 1fr); }
  .pros-cons-grid { grid-template-columns: repeat(2, 1fr); }
}

/* Tablets landscape (768px+) */
@media (min-width: 768px) {
  .container { padding-left: 30px; padding-right: 30px; }
  .section-padding { padding: 70px 0; }
  .section-heading { font-size: 32px; }
  .section-subtext { font-size: 17px; }

  .nav-links { display: flex; }
  .nav-cta { display: block; }
  .hamburger { display: none; }

  .hero { padding-top: 90px; }
  .hero-grid {
    flex-direction: row;
    gap: 40px;
    padding: 60px 0 70px;
  }
  .hero-image { width: 45%; max-width: 420px; order: 0; }
  .hero-content { text-align: left; width: 55%; }
  .hero-content h1 { font-size: 34px; }
  .hero-cta-wrap { align-items: flex-start; }
  .hero-cta-wrap .btn-primary { width: auto; }

  .trust-grid { grid-template-columns: repeat(4, 1fr); }
  .trust-card { padding: 28px 20px; }

  .formula-grid { grid-template-columns: repeat(2, 1fr); }

  .what-is-grid { flex-direction: row; }
  .what-is-image { width: 40%; }
  .what-is-content { width: 60%; }
  .what-is-content h2 { text-align: left; }

  .steps-container { padding-left: 30px; }

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

  .guarantee-grid { flex-direction: row; align-items: flex-start; }
  .guarantee-image { width: 200px; }
  .guarantee-content { text-align: left; flex: 1; }

  .order-grid { flex-direction: row; }
  .order-image { width: 40%; }
  .order-content { flex: 1; }

  .footer-grid { flex-direction: row; justify-content: space-between; }
}

/* Laptops (1024px+) */
@media (min-width: 1024px) {
  .section-padding { padding: 90px 0; }
  .section-heading { font-size: 36px; }

  .hero-content h1 { font-size: 42px; }
  .hero-grid { gap: 60px; padding: 80px 0 100px; }

  .formula-grid { grid-template-columns: repeat(3, 1fr); }

  .ingredient-grid { grid-template-columns: repeat(2, 1fr); }

  .study-grid { grid-template-columns: repeat(2, 1fr); }

  .final-cta h2 { font-size: 36px; }
  .final-price .new-price { font-size: 40px; }
}

/* Large Desktop (1440px+) */
@media (min-width: 1440px) {
  .container { max-width: 1280px; }
  .hero-content h1 { font-size: 48px; }
  .section-heading { font-size: 40px; }
}