/* ==========================================================================
   CSS STYLESHEET — ООО «Стройпроект»
   ========================================================================== */

/* --- CSS Variables & Theme Tokens --- */
:root {
  --primary-color: #0284c7;
  --primary-hover: #0369a1;
  --primary-dark: #0f172a;
  --secondary-color: #f97316;
  --secondary-hover: #ea580c;
  --accent-color: #38bdf8;
  
  --bg-main: #ffffff;
  --bg-light: #f8fafc;
  --bg-card: #ffffff;
  --bg-dark: #0f172a;

  --text-main: #1e293b;
  --text-muted: #64748b;
  --text-white: #ffffff;

  --border-color: #e2e8f0;
  --border-focus: #0284c7;

  --font-main: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 28px rgba(0,0,0,0.12);

  --transition: all 0.25s ease-in-out;
  --max-width: 1200px;
}

/* --- Reset & Base Styles --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: var(--transition);
}

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

ul {
  list-style: none;
}

/* --- Layout Containers --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container-sm {
  max-width: 800px;
}

.section {
  padding: 5rem 0;
}

.bg-light {
  background-color: var(--bg-light);
}

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

.text-white {
  color: var(--text-white) !important;
}

.muted {
  color: var(--text-muted);
}

.muted-sm {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.grid {
  display: grid;
  gap: 2rem;
}

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

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

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* --- Typography & Headings --- */
h1, h2, h3, h4 {
  color: var(--primary-dark);
  font-weight: 700;
  line-height: 1.25;
}

.section-header {
  margin-bottom: 3rem;
}

.section-subtitle {
  display: inline-block;
  color: var(--secondary-color);
  font-weight: 700;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: 2.25rem;
  margin-bottom: 0.5rem;
}

.section-desc {
  color: var(--text-muted);
  font-size: 1.1rem;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

.btn-primary {
  background-color: var(--primary-color);
  color: var(--text-white);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  color: var(--text-white);
}

.btn-secondary {
  background-color: transparent;
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.btn-secondary:hover {
  background-color: var(--primary-color);
  color: var(--text-white);
}

.btn-lg {
  padding: 0.9rem 2rem;
  font-size: 1.05rem;
}

.full-width {
  width: 100%;
}

/* --- Header / Navbar --- */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary-dark);
}

.logo-icon {
  font-size: 1.75rem;
}

.nav-list {
  display: flex;
  gap: 1.5rem;
}

.nav-link {
  color: var(--text-main);
  font-weight: 500;
  font-size: 0.95rem;
}

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

.header-contacts {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.phone-link {
  font-weight: 700;
  color: var(--primary-dark);
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  flex-direction: column;
  gap: 5px;
}

.hamburger-bar {
  width: 25px;
  height: 3px;
  background-color: var(--primary-dark);
  border-radius: 2px;
  transition: var(--transition);
}

/* --- Hero Section --- */
.hero {
  padding: 5rem 0 4rem;
  background: linear-gradient(135deg, #f0f9ff 0%, #ffffff 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}

.badge-tag {
  display: inline-block;
  background-color: #e0f2fe;
  color: var(--primary-color);
  font-weight: 600;
  font-size: 0.85rem;
  padding: 0.35rem 0.85rem;
  border-radius: 20px;
  margin-bottom: 1.25rem;
}

.hero-title {
  font-size: 2.75rem;
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.hero-badges {
  display: flex;
  gap: 2rem;
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
}

.badge-item {
  display: flex;
  flex-direction: column;
}

.badge-num {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--secondary-color);
}

.badge-txt {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.hero-image-wrapper {
  position: relative;
}

.hero-img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  object-fit: cover;
  width: 100%;
}

.hero-card-overlay {
  position: absolute;
  bottom: -20px;
  left: -20px;
  background: var(--bg-card);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  max-width: 320px;
  border: 1px solid var(--border-color);
}

.hero-card-overlay .overlay-icon {
  font-size: 2rem;
}

.hero-card-overlay p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --- Cards --- */
.card {
  background-color: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 2rem;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.benefit-card {
  text-align: center;
}

.benefit-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.benefit-card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.benefit-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* --- Services Section --- */
.service-card {
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.service-img-box {
  height: 220px;
  overflow: hidden;
}

.service-img-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.service-card:hover .service-img-box img {
  transform: scale(1.05);
}

.service-content {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.service-content h3 {
  font-size: 1.35rem;
  margin-bottom: 0.75rem;
}

.service-content p {
  color: var(--text-muted);
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.service-list {
  margin-bottom: 1.5rem;
}

.service-list li {
  font-size: 0.9rem;
  color: var(--text-main);
  padding-left: 1.25rem;
  position: relative;
  margin-bottom: 0.35rem;
}

.service-list li::before {
  content: "✔";
  position: absolute;
  left: 0;
  color: var(--primary-color);
}

.service-btn {
  margin-top: auto;
  font-weight: 700;
  color: var(--primary-color);
}

/* --- How It Works --- */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1.25rem;
}

.step-card {
  background: var(--bg-card);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  position: relative;
}

.step-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary-color);
  opacity: 0.3;
  margin-bottom: 0.5rem;
}

.step-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.step-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* --- Pricing --- */
.pricing-card {
  display: flex;
  flex-direction: column;
  position: relative;
}

.pricing-card.featured {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-md);
}

.badge-featured {
  position: absolute;
  top: -12px;
  right: 20px;
  background: var(--secondary-color);
  color: var(--text-white);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.75rem;
  border-radius: 12px;
  text-transform: uppercase;
}

.pricing-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.25rem;
  margin-bottom: 1.25rem;
}

.pricing-header h3 {
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
}

.price {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary-dark);
}

.price span {
  font-size: 1rem;
  font-weight: 400;
  color: var(--text-muted);
}

.pricing-features {
  margin-bottom: 2rem;
  flex-grow: 1;
}

.pricing-features li {
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

/* --- Certifications --- */
.cert-box {
  background: var(--bg-dark);
  color: var(--text-white);
  border-radius: var(--radius-lg);
  padding: 3.5rem;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  align-items: center;
}

.cert-text h2 {
  color: var(--text-white);
  font-size: 2rem;
  margin-bottom: 1rem;
}

.cert-text p {
  color: #94a3b8;
  margin-bottom: 1.5rem;
}

.cert-details li {
  margin-bottom: 0.75rem;
  font-size: 0.95rem;
  color: #cbd5e1;
}

.cert-details strong {
  color: var(--text-white);
}

.cert-image-frame img {
  border-radius: var(--radius-md);
  object-fit: cover;
  width: 100%;
}

/* --- Testimonials --- */
.testimonial-card {
  display: flex;
  flex-direction: column;
}

.testimonial-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.avatar {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  object-fit: cover;
}

.testimonial-body {
  font-style: italic;
  color: var(--text-main);
  font-size: 0.95rem;
}

/* --- FAQ Accordion --- */
.accordion {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 1.5rem;
  background: none;
  border: none;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--primary-dark);
  cursor: pointer;
  text-align: left;
}

.faq-icon {
  font-size: 1.5rem;
  font-weight: 400;
  transition: transform 0.25s ease;
}

.faq-question[aria-expanded="true"] .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 1.5rem 1.25rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* --- Contact Section --- */
.contact-info h2 {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.contact-info p {
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.info-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.info-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.info-icon {
  font-size: 1.5rem;
}

.contact-card h3 {
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-family: var(--font-main);
  font-size: 0.95rem;
  transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
}

.form-group.error input,
.form-group.error select,
.form-group.error textarea {
  border-color: #ef4444;
}

.error-msg {
  color: #ef4444;
  font-size: 0.8rem;
  display: none;
}

.form-group.error .error-msg {
  display: block;
}

.form-status {
  padding: 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  text-align: center;
}

.form-status.success {
  background-color: #dcfce7;
  color: #166534;
  border: 1px solid #bbf7d0;
}

.form-disclaimer {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

/* --- Footer --- */
.footer {
  background-color: var(--bg-dark);
  color: #94a3b8;
  padding: 4rem 0 2rem;
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 3rem;
  border-bottom: 1px solid #334155;
  padding-bottom: 2.5rem;
  margin-bottom: 1.5rem;
}

.footer-brand p {
  margin-top: 1rem;
}

.footer-copy {
  margin-top: 1.5rem;
  font-size: 0.8rem;
  color: #64748b;
}

.footer-nav h4,
.footer-contacts h4 {
  color: var(--text-white);
  font-size: 1rem;
  margin-bottom: 1rem;
}

.footer-nav ul li {
  margin-bottom: 0.5rem;
}

.footer-nav a {
  color: #94a3b8;
}

.footer-nav a:hover {
  color: var(--text-white);
}

/* --- Responsive Media Queries --- */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .cert-box {
    grid-template-columns: 1fr;
    padding: 2rem;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .header-contacts {
    display: none;
  }

  .mobile-toggle {
    display: flex;
  }

  .nav {
    position: absolute;
    top: 80px;
    left: 0;
    width: 100%;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem;
    display: none;
    box-shadow: var(--shadow-md);
  }

  .nav.active {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    gap: 1rem;
  }

  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }

  .steps-grid {
    grid-template-columns: 1fr;
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-badges {
    flex-direction: column;
    gap: 1rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}