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

:root {
  --primary: #0d9488;
  --primary-dark: #0f766e;
  --primary-light: #14b8a6;
  --bg: #ffffff;
  --bg-alt: #f1f5f9;
  --text: #1e293b;
  --text-light: #475569;
  --muted: #64748b;
  --border: #e2e8f0;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-lg: 0 10px 25px rgba(0,0,0,.08);
  --font: 'Inter', system-ui, sans-serif;
}

html { scroll-behavior: smooth; }
body { font-family: var(--font); color: var(--text); line-height: 1.6; background: var(--bg); padding-top: 64px; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: all .3s;
}
.navbar.scrolled {
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,.98);
}
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  text-decoration: none;
}
.logo svg { color: var(--primary); }
.nav-links {
  display: flex;
  list-style: none;
  gap: 8px;
}
.nav-links a {
  text-decoration: none;
  color: var(--text-light);
  font-size: .9rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 8px;
  transition: all .2s;
}
.nav-links a:hover { color: var(--primary); background: rgba(13,148,136,.08); }
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all .3s;
}

.section { padding: 80px 0; }
.section--alt { background: var(--bg-alt); }

.section-title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 0.75rem;
  color: var(--text);
}
.section-desc {
  text-align: center;
  color: var(--muted);
  font-size: 1.1rem;
  margin-bottom: 3rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}
.text-center { text-align: center; }
.accent { color: var(--primary); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all .2s;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: var(--shadow-lg); }
.btn-lg { padding: 18px 40px; font-size: 1.1rem; }

/* Hero */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #f0fdfa 0%, #ccfbf1 50%, #f0fdfa 100%);
  padding-top: 64px;
}
.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.hero-content { text-align: left; }
.hero-image {
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(13,148,136,.1);
  color: var(--primary-dark);
  border-radius: 50px;
  font-size: .85rem;
  font-weight: 500;
  margin-bottom: 24px;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  color: var(--text);
}
.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-light);
  max-width: 650px;
  margin: 0 auto 32px;
}

/* Cards Grid */
.cards-grid {
  display: grid;
  gap: 24px;
}
.cards-grid--3 { grid-template-columns: repeat(3, 1fr); }
.cards-grid--4 { grid-template-columns: repeat(4, 1fr); }
.cards-grid--5 { grid-template-columns: repeat(5, 1fr); }

.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: all .2s;
}
.card:hover { box-shadow: var(--shadow-lg); border-color: var(--primary-light); }
.card--sm { padding: 20px; text-align: center; }
.card-icon { width: 40px; height: 40px; color: var(--primary); margin-bottom: 16px; }
.card--sm .card-icon { margin: 0 auto 12px; width: 32px; height: 32px; }
.card h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 10px; }
.card p { font-size: .9rem; color: var(--text-light); line-height: 1.55; }

/* Products */
.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  max-width: 800px;
  margin: 0 auto;
}
.product-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-weight: 500;
}
.product-icon { width: 36px; height: 36px; color: var(--primary); flex-shrink: 0; display: flex; align-items: center; justify-content: center; }
.products-note { text-align: center; color: var(--muted); margin-top: 24px; font-size: .9rem; max-width: 700px; margin-left: auto; margin-right: auto; }

/* Steps */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 900px;
  margin: 0 auto;
}
.step {
  display: flex;
  gap: 16px;
  padding: 24px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  align-items: flex-start;
}
.step-num {
  width: 36px;
  height: 36px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: .9rem;
  flex-shrink: 0;
}
.step h4 { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
.step p { font-size: .85rem; color: var(--text-light); }
.step-time { display: inline-block; margin-top: 8px; font-size: .8rem; color: var(--primary); font-weight: 600; }

/* Calc */
.calc-showcase { max-width: 700px; margin: 0 auto 32px; }
.calc-item { display: flex; justify-content: space-between; padding: 16px 0; border-bottom: 1px solid var(--border); gap: 20px; }
.calc-label { font-weight: 600; white-space: nowrap; }
.calc-val { color: var(--text-light); text-align: right; font-size: .9rem; }
.calc-example {
  max-width: 700px;
  margin: 0 auto;
  padding: 28px;
  background: var(--bg-alt);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.calc-example-title { font-weight: 700; font-size: 1.1rem; margin-bottom: 12px; }
.calc-example p { color: var(--text-light); margin-bottom: 16px; }
.calc-example-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; text-align: center; }
.calc-example-grid div { padding: 12px; }
.calc-num { display: block; font-size: 1.3rem; font-weight: 700; color: var(--primary); margin-bottom: 4px; }
.calc-example-grid span:last-child { font-size: .8rem; color: var(--muted); }

/* Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.feature { text-align: center; padding: 24px 16px; }
.feature-icon { width: 44px; height: 44px; color: var(--primary); margin: 0 auto 16px; }
.feature h4 { font-weight: 600; margin-bottom: 8px; font-size: 1rem; }
.feature p { font-size: .85rem; color: var(--text-light); }

/* Safety */
.safety-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.safety-card { text-align: center; padding: 32px 20px; background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); }
.safety-num { font-size: 2.5rem; font-weight: 800; color: var(--primary); margin-bottom: 8px; }
.safety-card h4 { font-weight: 600; margin-bottom: 8px; }
.safety-card p { font-size: .85rem; color: var(--text-light); }

/* Case */
.case-img {
  border-radius: var(--radius) var(--radius) 0 0;
  margin: -20px -20px 16px;
  width: calc(100% + 40px);
}
.safety-image {
  margin-top: 32px;
}

.case-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(13,148,136,.1);
  color: var(--primary-dark);
  border-radius: 50px;
  font-size: .8rem;
  font-weight: 500;
  margin-bottom: 12px;
}
.case-stats { display: flex; gap: 16px; margin-bottom: 12px; }
.case-stats span { font-weight: 600; font-size: .95rem; color: var(--text); }

/* Pricing */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 1000px;
  margin: 0 auto;
}
.pricing-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  transition: all .2s;
}
.pricing-card:hover { box-shadow: var(--shadow-lg); }
.pricing-card--featured {
  border-color: var(--primary);
  box-shadow: 0 0 0 1px var(--primary);
  position: relative;
}
.pricing-card--featured::before {
  content: 'Рекомендуем';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 4px 16px;
  background: var(--primary);
  color: #fff;
  border-radius: 50px;
  font-size: .8rem;
  font-weight: 600;
}
.pricing-card h3 { font-size: 1.4rem; font-weight: 700; margin-bottom: 8px; }
.pricing-desc { font-size: .9rem; color: var(--muted); margin-bottom: 24px; }
.pricing-list { list-style: none; flex: 1; margin-bottom: 24px; }
.pricing-list li { padding: 8px 0; font-size: .9rem; color: var(--text-light); border-bottom: 1px solid var(--border); }
.pricing-list li::before { content: '✓'; color: var(--primary); margin-right: 8px; font-weight: 700; }
.pricing-volume { font-size: .85rem; color: var(--muted); text-align: center; padding-top: 16px; border-top: 1px solid var(--border); }

/* Order */
.order-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.order-hint {
  color: var(--primary);
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 24px;
}
.order-contacts { display: flex; flex-direction: column; gap: 12px; }
.order-contact { display: flex; align-items: center; gap: 10px; color: var(--text-light); font-size: .95rem; }
.order-contact svg { width: 20px; height: 20px; color: var(--primary); flex-shrink: 0; }

.order-form { display: flex; flex-direction: column; gap: 14px; }
.order-form input,
.order-form select,
.order-form textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: .95rem;
  background: var(--bg);
  transition: border-color .2s;
}
.order-form input:focus,
.order-form select:focus,
.order-form textarea:focus { outline: none; border-color: var(--primary); }
.order-form textarea { resize: vertical; }
.checkbox { display: flex; align-items: flex-start; gap: 10px; font-size: .85rem; color: var(--muted); cursor: pointer; }
.checkbox input { width: auto; margin-top: 3px; }

/* Footer */
.footer { background: #0f172a; color: #94a3b8; padding: 48px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 32px; margin-bottom: 32px; }
.footer-col h4 { color: #f1f5f9; font-weight: 600; margin-bottom: 12px; font-size: 1rem; }
.footer-col p { font-size: .9rem; line-height: 1.7; }
.footer-bottom { border-top: 1px solid #1e293b; padding-top: 20px; text-align: center; font-size: .85rem; }

/* Back to top */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: var(--primary);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(13,148,136,.35);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all .3s;
  z-index: 999;
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover { background: var(--primary-dark); transform: translateY(-2px); }

/* Fade animation */
.fade-in { opacity: 0; transform: translateY(30px); transition: opacity .6s ease, transform .6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* Responsive */
@media (max-width: 1024px) {
  .cards-grid--5 { grid-template-columns: repeat(3, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .safety-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .section { padding: 60px 0; }
  .section-title { font-size: 1.6rem; }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 12px;
    gap: 4px;
    box-shadow: var(--shadow-lg);
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }
  .nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
  .nav-toggle.active span:nth-child(2) { opacity: 0; }
  .nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

  .hero .container { grid-template-columns: 1fr; text-align: center; gap: 32px; }
  .hero-content { text-align: center; }
  .hero-image { max-width: 400px; margin: 0 auto; }

  .cards-grid--3, .cards-grid--4, .cards-grid--5 { grid-template-columns: 1fr; }
  .products-grid { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .safety-grid { grid-template-columns: 1fr 1fr; }
  .pricing-grid { grid-template-columns: 1fr; max-width: 400px; }
  .order-wrapper { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .calc-example-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .products-grid { grid-template-columns: 1fr; }
  .safety-grid { grid-template-columns: 1fr; }
  .hero { min-height: 70vh; }
  .btn-lg { padding: 14px 28px; font-size: 1rem; }
}