:root {
  --primary-color: #2A6B6B;
  --secondary-color: #358080;
  --accent-color: #3D9494;
  --light-color: #E8F4F4;
  --dark-color: #0F2E2E;
  --gradient-primary: linear-gradient(135deg, #2A6B6B 0%, #3D9494 100%);
  --hover-color: #1E5252;
  --background-color: #F5FBFB;
  --text-color: #1E3A3A;
  --border-color: rgba(42, 107, 107, 0.14);
  --shadow-color: rgba(15, 46, 46, 0.09);
  --highlight-color: #A8D8D8;
  --main-font: 'Montserrat', sans-serif;
  --alt-font: 'Open Sans', sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0;
  margin: -1px; overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}

body {
  font-family: var(--alt-font);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  color: var(--text-color);
  background-color: var(--background-color);
}

/* Pattern BG — cross-hatch */
.pattern-bg {
  background-image:
    repeating-linear-gradient(0deg, transparent, transparent 34px, rgba(42,107,107,0.04) 34px, rgba(42,107,107,0.04) 35px),
    repeating-linear-gradient(90deg, transparent, transparent 34px, rgba(42,107,107,0.04) 34px, rgba(42,107,107,0.04) 35px);
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: -1;
}

header {
  background: var(--dark-color);
  padding: 1.2rem 0;
  position: relative;
  overflow: hidden;
  box-shadow: 0 2px 8px var(--shadow-color);
}
header::before,
header::after { content: ''; position: absolute; display: none; }
@media (min-width: 768px) {
  header::before {
    display: block;
    right: 30px; top: 50%; transform: translateY(-50%);
    width: 120px; height: 2px;
    background: var(--highlight-color);
    opacity: 0.2;
    border-radius: 2px;
    box-shadow: 0 -10px 0 rgba(168,216,216,0.1), 0 10px 0 rgba(168,216,216,0.1);
  }
  header::after {
    display: block;
    right: 180px; top: 50%; transform: translateY(-50%);
    width: 14px; height: 14px;
    border-radius: 50%;
    background: var(--accent-color);
    opacity: 0.25;
  }
}

.container {
  max-width: 1050px;
  margin: 0 auto;
  width: 100%;
  padding: 0 1.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: white;
  font-family: var(--main-font);
  font-size: 1.5rem;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: 0.06em;
  width: fit-content;
}
.logo-icon {
  width: 34px; height: 34px;
  background: var(--accent-color);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
  transform: rotate(45deg);
}
.logo-icon span { transform: rotate(-45deg); display: block; }

main {
  flex: 1;
  display: flex;
  align-items: center;
  padding: 2rem 0;
  justify-content: center;
}

.product-section {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: flex-start;
}
@media (min-width: 768px) {
  .product-section { grid-template-columns: 1fr 1fr; }
}

.product-left {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.product-image-container {
  border-radius: 10px;
  box-shadow: 0 4px 16px var(--shadow-color);
  background: white;
  padding: 1.3rem;
  border: 2px solid var(--border-color);
  text-align: center;
  position: relative;
}
.product-image-container::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 4px;
  background: var(--gradient-primary);
  border-radius: 0 0 8px 8px;
}
.product-image-container picture { display: flex; justify-content: center; }
.product-image {
  width: 50%;
  height: auto;
  transition: transform 0.3s ease;
}
.product-image:hover { transform: scale(1.04); }

.guarantee-block {
  background: var(--light-color);
  color: var(--text-color);
  padding: 1rem 1.15rem;
  border-radius: 10px;
  box-shadow: 0 2px 8px var(--shadow-color);
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.guarantee-block h3 {
  font-family: var(--main-font);
  color: var(--primary-color);
  font-size: 0.91rem;
  font-weight: 700;
}
.guarantee-block p { font-size: 0.83rem; line-height: 1.5; }

/* feature-items — vertical numbered list style */
.features-icons {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}
.feature-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0.9rem;
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 6px var(--shadow-color);
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
  counter-increment: feature-counter;
}
.feature-item:hover {
  border-color: var(--primary-color);
  box-shadow: 0 3px 10px var(--shadow-color);
}
.feature-item .feature-icon {
  width: 30px; height: 30px;
  background: var(--gradient-primary);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  flex-shrink: 0;
  color: white;
}
.feature-item span:last-child {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-color);
  font-family: var(--main-font);
}

.cart-button {
  background: var(--gradient-primary);
  color: white;
  padding: 0.82rem 1.6rem;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-block;
  text-align: center;
  box-shadow: 0 3px 10px var(--shadow-color);
  font-family: var(--main-font);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.cart-button:hover {
  background: var(--hover-color);
  transform: translateY(-2px);
  box-shadow: 0 5px 14px var(--shadow-color);
}

.product-right h1 {
  font-family: var(--main-font);
  font-size: 1.8rem;
  color: var(--dark-color);
  margin-bottom: 0.65rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.01em;
}
.price {
  font-size: 1.95rem;
  font-weight: 800;
  color: var(--primary-color);
  margin: 0.7rem 0;
  font-family: var(--main-font);
}
.product-description {
  font-size: 0.88rem;
  margin-bottom: 1rem;
  line-height: 1.7;
  color: var(--text-color);
}
.highlight-text {
  background: var(--dark-color);
  color: white;
  padding: 0.9rem 1.1rem;
  border-radius: 8px;
  font-weight: 700;
  margin: 1rem 0;
  text-align: center;
  font-size: 0.91rem;
  font-family: var(--main-font);
  letter-spacing: 0.02em;
  border-left: 4px solid var(--highlight-color);
}

.features-list {
  list-style: none;
  margin: 1rem 0;
}
.features-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  margin-bottom: 0.65rem;
  padding: 0.7rem 0.9rem;
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 6px var(--shadow-color);
  border-bottom: 2px solid var(--border-color);
  font-size: 0.86rem;
  transition: all 0.3s ease;
}
.features-list li:hover {
  border-bottom-color: var(--primary-color);
  transform: translateX(3px);
}
.feature-check {
  width: 18px; height: 18px;
  background: var(--gradient-primary);
  border-radius: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: bold;
  flex-shrink: 0;
  font-size: 0.72rem;
}

/* Full-width benefits — two-tone split layout */
.promo-block {
  background: var(--light-color);
  padding: 2.2rem 1.5rem;
  border-top: 3px solid var(--primary-color);
}
.promo-block h2 {
  font-family: var(--main-font);
  text-align: center;
  font-size: 1.6rem;
  margin-bottom: 1.7rem;
  color: var(--dark-color);
  font-weight: 800;
}
.promo-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  max-width: 1050px;
  margin: 0 auto;
}
@media (min-width: 768px) {
  .promo-grid { grid-template-columns: repeat(4, 1fr); }
}
.promo-card {
  background: white;
  border-radius: 10px;
  padding: 1.1rem 0.9rem;
  text-align: center;
  box-shadow: 0 2px 8px var(--shadow-color);
  border-top: 3px solid var(--primary-color);
  transition: transform 0.3s ease;
}
.promo-card:hover { transform: translateY(-3px); }
.promo-card-icon {
  font-size: 1.6rem;
  margin-bottom: 0.5rem;
  display: block;
}
.promo-card h3 {
  font-family: var(--main-font);
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 0.35rem;
}
.promo-card p { font-size: 0.81rem; color: var(--text-color); line-height: 1.5; }

/* Testimonials */
.testimonials {
  background: var(--dark-color);
  padding: 2.2rem 1.5rem;
}
.testimonials h2 {
  font-family: var(--main-font);
  text-align: center;
  margin-bottom: 1.7rem;
  font-size: 1.6rem;
  font-weight: 800;
  color: white;
  letter-spacing: -0.01em;
}
.testimonials-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  max-width: 1050px;
  margin: 0 auto;
}
@media (min-width: 768px) {
  .testimonials-grid { grid-template-columns: 1fr 1fr; }
}
.testimonial {
  background: rgba(255,255,255,0.07);
  padding: 1.1rem;
  border-radius: 8px;
  border-left: 3px solid var(--highlight-color);
  transition: transform 0.3s ease;
}
.testimonial:hover { transform: translateY(-2px); }
.testimonial-header {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 0.65rem;
}
.testimonial-icon {
  width: 38px; height: 38px;
  background: var(--highlight-color);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: var(--dark-color);
  flex-shrink: 0;
}
.testimonial-name {
  font-weight: 700;
  font-size: 0.88rem;
  font-family: var(--main-font);
  color: var(--highlight-color);
}
.testimonial p { line-height: 1.55; font-size: 0.85rem; color: rgba(255,255,255,0.87); }

footer {
  background: var(--dark-color);
  color: white;
  padding: 1.7rem 1.5rem;
  border-top: 1px solid rgba(168,216,216,0.12);
}
.footer-content {
  max-width: 1050px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  padding-bottom: 1rem;
}
@media (min-width: 768px) {
  .footer-content { flex-direction: row; justify-content: space-between; align-items: center; }
}
.footer-nav {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  justify-content: center;
}
@media (min-width: 768px) { .footer-nav { justify-content: flex-end; } }
.footer-nav a {
  color: rgba(255,255,255,0.72);
  text-decoration: none;
  transition: color 0.3s;
  font-size: 0.83rem;
}
.footer-nav a:hover { color: var(--highlight-color); }
.footer-credit {
  text-align: center;
  padding-top: 1rem;
  border-top: 1px solid rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.48);
  font-size: 0.79rem;
  max-width: 1050px;
  margin: 0 auto;
}
.footer-credit a { color: var(--highlight-color); text-decoration: none; }