:root {
  --primary: #1e3a5f;
  --primary-dark: #152a44;
  --accent: #2a9d8f;
  --accent-dark: #e6f4f1;
  --accent-light: #fde8e5;
  --light: #f8fafc;
  --gray: #64748b;
  --gray-light: #e2e8f0;
  --white: #ffffff;
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
  --radius: 8px;
  --container: 1200px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing: 1.5rem;
  --spacing-lg: 3rem;
  --spacing-xl: 5rem;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  color: var(--primary);
  background: var(--white);
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent); }
button { font: inherit; cursor: pointer; }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 1.5rem;
  background: var(--accent);
  color: var(--white);
  border: none;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  transition: background 0.2s, transform 0.1s;
}
.btn:hover { background: var(--accent-dark); }
.btn:active { transform: scale(0.98); }
.btn-outline {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
}
.btn-outline:hover { background: var(--primary); color: var(--white); }
.btn-large { padding: 1rem 2rem; font-size: 1.125rem; }

.section { padding: var(--spacing-xl) 0; }
.section-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  margin-bottom: var(--spacing);
  color: var(--primary);
  line-height: 1.2;
}
.section-desc {
  font-size: clamp(1.125rem, 2.5vw, 1.375rem);
  color: var(--gray);
  max-width: 100%;
  margin-bottom: var(--spacing-lg);
  line-height: 1.7;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--gray-light);
  padding: var(--spacing-xs) 0;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
}
.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
}
.logo span { color: var(--accent); }
.nav { display: none; gap: var(--spacing); }
.nav a { font-weight: 500; font-size: 0.95rem; }
.header-contacts {
  display: flex;
  align-items: center;
  gap: var(--spacing);
}
.phone {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--primary);
}
.menu-toggle {
  display: block;
  padding: 0.5rem;
  background: none;
  border: 1px solid var(--gray-light);
  border-radius: var(--radius);
}
.nav-open {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--white);
  padding: var(--spacing);
  border-bottom: 1px solid var(--gray-light);
  gap: var(--spacing-sm);
  box-shadow: var(--shadow-lg);
}

/* Hero */
.hero {
  position: relative;
  background: #d8dbde url('hero-concrete-logo.png') center / cover no-repeat;
  color: var(--primary);
  padding: var(--spacing-xl) 0;
  overflow: hidden;
  text-align: center;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(248, 250, 252, 0.72) 0%,
    rgba(248, 250, 252, 0.55) 50%,
    rgba(248, 250, 252, 0.72) 100%
  );
  pointer-events: none;
}
.hero .container {
  position: relative;
  z-index: 1;
  width: 100%;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
  color: var(--primary);
  text-shadow: 0 1px 2px rgba(248, 250, 252, 0.4);
}
.hero p {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--primary);
  opacity: 0.9;
  max-width: 70ch;
  margin: 0 auto var(--spacing-lg);
}
.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  justify-content: center;
}
.hero .btn { min-width: 220px; }
.hero .btn-outline {
  border-color: var(--primary);
  color: var(--primary);
}
.hero .btn-outline:hover {
  background: var(--primary);
  color: var(--white);
}
@media (max-width: 767px) {
  .hero::before {
    background: rgba(248, 250, 252, 0.72);
  }
}

/* About */
.about-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing);
  margin-top: var(--spacing-lg);
}
.stat-item {
  text-align: center;
  padding: var(--spacing);
  background: var(--light);
  border-radius: var(--radius);
}
.stat-item strong {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 0.5rem;
}
.stat-item p {
  color: var(--gray);
  margin: 0;
}

/* Services */
.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}
.service-card {
  background: var(--white);
  border: 1px solid var(--gray-light);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow 0.2s, transform 0.2s;
  display: flex;
  flex-direction: column;
}
.service-content {
  padding: var(--spacing);
  display: flex;
  flex-direction: column;
  flex: 1;
}
.service-content .btn {
  margin-top: auto;
  width: 100%;
  text-align: center;
}
.service-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}
.service-image {
  width: 100%;
  height: 220px;
  object-fit: cover;
  background: var(--gray-light);
}
.service-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  color: var(--primary);
}
.service-card p { color: var(--gray); margin-bottom: var(--spacing-sm); }
.service-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-sm);
}
.service-meta span {
  font-size: 0.875rem;
  padding: 0.25rem 0.75rem;
  background: var(--light);
  border-radius: 999px;
  color: var(--primary);
}

/* Pricing */
.pricing-wrap { overflow-x: auto; }
.pricing-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  min-width: 600px;
}
.pricing-table th,
.pricing-table td {
  padding: var(--spacing);
  text-align: left;
  border-bottom: 1px solid var(--gray-light);
}
.pricing-table th {
  background: var(--primary);
  color: var(--white);
  font-weight: 600;
}
.pricing-table tbody tr:hover { background: var(--light); }
.pricing-table td:nth-child(2) {
  font-weight: 700;
  color: var(--accent);
  white-space: nowrap;
}

/* Portfolio */
.portfolio { background: var(--light); }
.portfolio-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing);
}
.portfolio-item {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 4/3;
}
.portfolio-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s;
}
.portfolio-item:hover .portfolio-image { transform: scale(1.05); }
.portfolio-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(30,58,95,0.95), transparent);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--spacing);
  color: var(--white);
}
.portfolio-overlay h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}
.portfolio-overlay p { font-size: 0.95rem; opacity: 0.9; }

/* Materials */
.materials-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}
.material-card {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  padding: var(--spacing);
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--gray-light);
}
.material-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
}
.material-card ul {
  list-style: none;
  display: grid;
  gap: 0.5rem;
}
.material-card li {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  color: var(--gray);
  font-size: 0.95rem;
}
.material-card li::before {
  content: "✓";
  color: var(--accent);
  font-weight: 700;
  flex-shrink: 0;
}

/* Process */
.process-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing);
  counter-reset: step;
}
.process-step {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: var(--spacing);
  background: var(--white);
  border: 1px solid var(--gray-light);
  border-radius: var(--radius);
  text-align: left;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.process-step:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
}
.process-step::before {
  counter-increment: step;
  content: "0" counter(step);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--accent);
  color: var(--white);
  border-radius: 6px;
  font-weight: 800;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.process-step h3 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
}
.process-step p {
  margin: 0;
  color: var(--gray);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Guarantees */
.guarantees { background: var(--light); }
.guarantees-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-sm);
}
.guarantee-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  padding: var(--spacing);
  background: var(--white);
  border-radius: var(--radius);
  border-left: 4px solid var(--accent);
}
.guarantee-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: var(--accent);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.25rem;
}
.guarantee-item h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 0.25rem;
}
.guarantee-item p { color: var(--gray); font-size: 0.95rem; }

/* FAQ */
.faq-list {
  display: grid;
  gap: var(--spacing-sm);
  max-width: 900px;
}
.faq-item {
  background: var(--white);
  border: 1px solid var(--gray-light);
  border-radius: var(--radius);
  padding: var(--spacing);
}
.faq-item summary {
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--primary);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 2rem;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  transition: transform 0.2s;
}
.faq-item[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}
.faq-item[open] summary { margin-bottom: var(--spacing-sm); }
.faq-item p {
  color: var(--gray);
  line-height: 1.7;
}

/* Blog */
.blog-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}
.blog-card {
  background: var(--white);
  border: 1px solid var(--gray-light);
  border-radius: var(--radius);
  padding: var(--spacing);
  transition: box-shadow 0.2s, transform 0.2s;
  display: flex;
  flex-direction: column;
}
.blog-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}
.blog-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: var(--spacing-xs);
}
.blog-card p {
  color: var(--gray);
  margin-bottom: var(--spacing-sm);
  flex: 1;
}
.blog-card .btn {
  margin-top: auto;
  width: 100%;
  text-align: center;
}

/* Blog Article */
.blog-article {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-lg) 1rem;
}
.breadcrumbs {
  font-size: 0.875rem;
  color: var(--gray);
  margin-bottom: var(--spacing);
}
.breadcrumbs a {
  color: var(--accent);
}
.blog-article h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  margin-bottom: var(--spacing);
  line-height: 1.25;
}
.blog-article h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: var(--spacing-lg) 0 var(--spacing-sm);
}
.blog-article p {
  color: var(--gray);
  margin-bottom: var(--spacing-sm);
  line-height: 1.8;
}
.blog-article ul {
  margin: 0 0 var(--spacing-sm) 1.25rem;
  color: var(--gray);
  line-height: 1.8;
}
.blog-article img {
  border-radius: var(--radius);
  margin: var(--spacing) 0;
}
.article-cta {
  background: var(--light);
  padding: var(--spacing-lg);
  border-radius: var(--radius);
  margin-top: var(--spacing-lg);
  text-align: center;
}
.article-cta p {
  color: var(--primary);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

/* Contact */
.contact { background: var(--primary); color: var(--white); }
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}
.contact-info h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}
.contact-info p { opacity: 0.9; margin-bottom: var(--spacing-sm); }
.contact-list {
  list-style: none;
  display: grid;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}
.contact-list li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.contact-list li::before {
  content: "●";
  color: var(--accent);
  font-size: 0.75rem;
}
.contact-phone {
  font-size: 1.5rem;
  font-weight: 700;
  display: inline-block;
  margin: var(--spacing-sm) 0;
}
.contact-email {
  opacity: 0.9;
  font-size: 1.125rem;
}

/* Footer */
.footer {
  background: var(--primary-dark);
  color: var(--white);
  padding: var(--spacing-lg) 0 var(--spacing-sm);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}
.footer-brand .logo { color: var(--white); margin-bottom: var(--spacing-sm); }
.footer-brand p { opacity: 0.9; }
.footer-nav h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.9;
}
.footer-nav ul { list-style: none; display: grid; gap: 0.5rem; }
.footer-nav a { opacity: 0.9; }
.footer-nav a:hover { opacity: 1; color: var(--accent); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.15);
  padding-top: var(--spacing-sm);
  text-align: center;
  font-size: 0.875rem;
  opacity: 0.8;
}

/* Responsive */
@media (min-width: 640px) {
  .services-grid,
  .portfolio-grid,
  .materials-grid,
  .process-steps,
  .blog-list { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 768px) {
  .nav { display: flex; }
  .menu-toggle { display: none; }
  .contact-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
}

@media (min-width: 1024px) {
  .services-grid,
  .portfolio-grid,
  .materials-grid,
  .process-steps,
  .blog-list { grid-template-columns: repeat(3, 1fr); }
  .guarantees-list { grid-template-columns: repeat(2, 1fr); }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
/* === Чередование фонов секций === */
#services,
#process,
#faq {
  background: var(--light);
}

/* Гарантии переходят на белый — карточкам добавляем рамку, чтобы не сливались */
.guarantees {
  background: var(--white);
}
.guarantee-item {
  border: 1px solid var(--gray-light);
  border-left: 4px solid var(--accent);
}