:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --accent: #06b6d4;
  --accent-light: #67e8f9;
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --text-main: #0f172a;
  --text-muted: #475569;
  --border: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --glass: rgba(255, 255, 255, 0.85);
  --glass-dark: rgba(15, 23, 42, 0.75);
}

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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.25s ease;
}

.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.urbanplanner3d-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
  transition: all 0.3s ease;
}

.header-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.urbanplanner3d-logo img {
  height: 42px;
  width: auto;
  display: block;
}

.urbanplanner3d-nav ul {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

.urbanplanner3d-nav a {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-muted);
  position: relative;
  padding: 0.5rem 0;
}

.urbanplanner3d-nav a:hover,
.urbanplanner3d-nav a.active {
  color: var(--primary);
}

.urbanplanner3d-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width 0.3s ease;
}

.urbanplanner3d-nav a:hover::after,
.urbanplanner3d-nav a.active::after {
  width: 100%;
}

.urbanplanner3d-contacts {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: right;
}

.urbanplanner3d-burger {
  display: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-main);
}

.urbanplanner3d-mobile-menu {
  display: none;
  position: fixed;
  top: 73px;
  left: 0;
  width: 100%;
  height: calc(100vh - 73px);
  background: #ffffff;
  z-index: 99;
  flex-direction: column;
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  overflow-y: auto;
}

.urbanplanner3d-mobile-menu.open {
  display: flex;
}

.urbanplanner3d-mobile-nav ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.urbanplanner3d-mobile-nav a {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-main);
}

.urbanplanner3d-mobile-contacts {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  color: var(--text-muted);
}

.urbanplanner3d-footer {
  background: #0f172a;
  color: #f8fafc;
  padding: 4rem 0 2rem 0;
  margin-top: 4rem;
  border-top: 1px solid #1e293b;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-brand img {
  height: 45px;
  width: auto;
}

.footer-desc {
  color: #94a3b8;
  font-size: 0.95rem;
  max-width: 320px;
}

.footer-socials {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.footer-socials a {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: #1e293b;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #f8fafc;
  font-size: 1rem;
}

.footer-socials a:hover {
  background: var(--primary);
  transform: translateY(-2px);
}

.footer-col h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  color: #ffffff;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-col a {
  color: #94a3b8;
  font-size: 0.9rem;
}

.footer-col a:hover {
  color: var(--accent-light);
}

.footer-contacts-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  color: #94a3b8;
  font-size: 0.9rem;
}

.footer-info-block {
  font-size: 0.85rem;
  color: #64748b;
  margin-top: 1rem;
  line-height: 1.4;
}

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #64748b;
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-hero {
  padding: 5rem 0 3rem 0;
  background: linear-gradient(135deg, #eff6ff 0%, #e0f2fe 100%);
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.page-hero h1 {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text-main);
  margin-bottom: 1rem;
  line-height: 1.2;
}

.page-hero p {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 700px;
  line-height: 1.6;
}

.section-padding {
  padding: 5rem 0;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 3.5rem auto;
}

.badge {
  display: inline-block;
  padding: 0.35rem 1rem;
  border-radius: 9999px;
  background: #dbeafe;
  color: var(--primary);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 1rem;
  line-height: 1.3;
}

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

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

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

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.card {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 2rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: #cbd5e1;
}

.card-icon {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  background: linear-gradient(135deg, #dbeafe 0%, #e0f2fe 100%);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
}

.card h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-main);
}

.card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.glass-panel {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 20px;
  padding: 2.5rem;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
}

.dark-bg-section {
  color: #ffffff;
  border-radius: 24px;
  overflow: hidden;
  margin: 3rem 0;
  position: relative;
  background-size: cover;
  background-position: center;
}

.dark-bg-section h2,
.dark-bg-section h3 {
  color: #ffffff;
}

.dark-bg-section p {
  color: #cbd5e1;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.85rem 1.75rem;
  border-radius: 12px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.25s ease;
  border: none;
}

.btn-primary {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.35);
}

.btn-secondary {
  background: #ffffff;
  color: var(--text-main);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: #f1f5f9;
  border-color: #cbd5e1;
}

.slider-container {
  position: relative;
  overflow: hidden;
  border-radius: 20px;
  box-shadow: var(--shadow-lg);
}

.slider-wrapper {
  display: flex;
  transition: transform 0.5s ease-in-out;
}

.slide {
  min-width: 100%;
  padding: 4rem 3rem;
  background-size: cover;
  background-position: center;
  color: #ffffff;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 450px;
}

.slider-nav {
  position: absolute;
  bottom: 1.5rem;
  right: 2rem;
  display: flex;
  gap: 0.75rem;
  z-index: 10;
}

.slider-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.4);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.slider-btn:hover {
  background: rgba(255, 255, 255, 0.4);
}

.tabs-wrapper {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.tabs-header {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border);
}

.tab-btn {
  padding: 0.75rem 1.5rem;
  background: transparent;
  border: none;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: all 0.25s ease;
}

.tab-btn.active,
.tab-btn:hover {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.tab-content {
  display: none;
  animation: fadeIn 0.3s ease;
}

.tab-content.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 900px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

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

.faq-question i {
  transition: transform 0.3s ease;
  color: var(--primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 1.5rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 1.5rem 1.5rem 1.5rem;
}

.faq-item.active .faq-question i {
  transform: rotate(180deg);
}

.contact-form-card {
  background: var(--bg-card);
  border-radius: 20px;
  padding: 3rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  max-width: 750px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-main);
}

.form-input {
  width: 100%;
  padding: 0.85rem 1.25rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  font-size: 1rem;
  background: #f8fafc;
  transition: all 0.2s ease;
}

.form-input:focus {
  outline: none;
  border-color: var(--primary);
  background: #ffffff;
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

.form-input.error {
  border-color: #ef4444;
  background: #fef2f2;
}

.error-message {
  color: #ef4444;
  font-size: 0.85rem;
  display: none;
}

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.checkbox-group input {
  margin-top: 0.25rem;
}

.notification-box {
  display: none;
  padding: 1rem 1.5rem;
  border-radius: 10px;
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
  font-weight: 500;
}

.notification-box.success {
  background: #dcfce7;
  color: #15803d;
  border: 1px solid #bbf7d0;
}

.notification-box.error {
  background: #fee2e2;
  color: #b91c1c;
  border: 1px solid #fecaca;
}

.spinner {
  display: none;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: #ffffff;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@media (max-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .urbanplanner3d-nav,
  .urbanplanner3d-contacts {
    display: none;
  }
  .urbanplanner3d-burger {
    display: block;
  }
  .grid-3, .grid-2, .grid-4 {
    grid-template-columns: 1fr;
  }
  .page-hero h1 {
    font-size: 2.25rem;
  }
  .section-title {
    font-size: 1.75rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .contact-form-card {
    padding: 1.5rem;
  }
}