:root {
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-text-primary: #0f172a;
  --color-text-secondary: #475569;
  --color-accent: #4f46e5;
  --color-accent-hover: #4338ca;
  --color-accent-light: #eef2ff;
  --color-border: #e2e8f0;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.15);
  --radius-md: 8px;
  --radius-lg: 12px;
  --font-main: 'Inter', sans-serif;
}

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

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ============================================================================
HEADER & NAVIGATION
============================================================================ */
.header {
  position: sticky;
  top: 0;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2.5rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-accent);
  text-decoration: none;
}

.nav-menu {
  display: flex;
  gap: 2rem;
  list-style: none;
  margin-left: 77px;
}

.nav-link {
  color: var(--color-text-primary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

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

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
}

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  transition: 0.3s;
}

/* ============================================================================
LANGUAGE SWITCHER (中文 | РУ | EN)
============================================================================ */
.language-switcher {
  display: inline-flex;
  align-items: center;
  margin-left: auto;
}

.language-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 0;
}

.language-item {
  display: flex;
  align-items: center;
}

/* Создаем красивые разделители | между языками */
.language-item:not(:last-child)::after {
  content: "|";
  color: var(--color-border);
  margin: 0 12px;
  font-weight: 300;
  font-size: 1rem;
}

.language-link {
  text-decoration: none;
  color: var(--color-text-secondary);
  /* Шрифты для поддержки иероглифов, кириллицы и латиницы */
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "Microsoft YaHei", sans-serif; 
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  transition: color 0.2s ease, transform 0.2s ease;
}

.language-link:hover {
  color: var(--color-accent);
  transform: translateY(-1px);
}

/* Стиль для текущего (активного) языка */
.language-link.active {
  color: var(--color-text-primary);
  pointer-events: none;
  cursor: default;
  font-weight: 800;
}

/* ============================================================================
MOBILE RESPONSIVE
============================================================================ */
@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }
  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    flex-direction: column;
    padding: 1rem;
    gap: 1rem;
    border-bottom: 1px solid var(--color-border);
    display: none;
  }
  .nav-menu.is-active {
    display: flex;
  }
  
  /* Мобильная версия переключателя языков */
  .language-switcher {
    width: 100%;
    justify-content: center;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--color-border);
  }
  .language-list {
    gap: 0;
  }

  .split-layout {
    grid-template-columns: 1fr;
  }
  
  .pricing-card.featured {
    transform: scale(1);
  }
  .pricing-card.featured:hover {
    transform: translateY(-5px);
  }
}

/* ============================================================================
HERO SECTION
============================================================================ */
.hero {
  padding: 6rem 0;
  text-align: center;
  background: linear-gradient(135deg, var(--color-accent-light) 0%, var(--color-bg) 100%);
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  max-width: 700px;
  margin: 0 auto 2rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================================================
BUTTONS
============================================================================ */
.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s;
  cursor: pointer;
  border: none;
  font-size: 1rem;
}

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

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
}

.btn-outline:hover {
  background: var(--color-accent);
  color: white;
}

/* ============================================================================
SECTIONS COMMON
============================================================================ */
.section {
  padding: 5rem 0;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  text-align: center;
  max-width: 700px;
  margin: 0 auto 3rem;
}

/* ============================================================================
FEATURES GRID
============================================================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: var(--color-surface);
  padding: 2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

/* ============================================================================
WORKFLOW SECTION
============================================================================ */
.workflow-section {
  background: var(--color-surface);
}

.workflow-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.workflow-step {
  background: var(--color-bg);
  padding: 2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  position: relative;
  transition: transform 0.3s, box-shadow 0.3s;
}

.workflow-step:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.step-number {
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-accent-light);
  position: absolute;
  top: 1rem;
  right: 1.5rem;
}

.workflow-step h3 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  margin-top: 2rem;
}

/* ============================================================================
DISTRIBUTED SECTION & ASCII ART
============================================================================ */
.distributed-section {
  background: var(--color-bg);
}

.split-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.lead-text {
  font-size: 1.125rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.feature-list {
  list-style: none;
  margin-top: 1.5rem;
}

.feature-list li {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
  position: relative;
}

.feature-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: bold;
}

.ascii-art-block {
  background: #0f172a;
  color: #4ade80;
  padding: 1.5rem;
  border-radius: var(--radius-md);
  font-family: 'Fira Code', 'Courier New', monospace;
  font-size: 0.85rem;
  line-height: 1.4;
  overflow-x: auto;
  box-shadow: var(--shadow-lg);
  border: 1px solid #1e293b;
}

.caption {
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-top: 1rem;
  font-style: italic;
}

/* ============================================================================
AUDIENCE SECTION
============================================================================ */
.audience-section {
  background: var(--color-surface);
}

.audience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.audience-card {
  background: var(--color-bg);
  padding: 2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: transform 0.3s, box-shadow 0.3s;
}

.audience-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.audience-card .icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.audience-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

/* ============================================================================
PRICING SECTION
============================================================================ */
.pricing-section {
  background: var(--color-bg);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.pricing-card {
  background: var(--color-surface);
  padding: 2.5rem;
  border-radius: var(--radius-lg);
  border: 2px solid var(--color-border);
  text-align: center;
  transition: transform 0.3s, box-shadow 0.3s;
  position: relative;
}

.pricing-card.featured {
  border-color: var(--color-accent);
  transform: scale(1.05);
}

.pricing-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.pricing-card.featured:hover {
  transform: scale(1.05) translateY(-5px);
}

.pricing-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.price {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-accent);
  margin-bottom: 1.5rem;
}

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

.pricing-features {
  list-style: none;
  margin-bottom: 2rem;
}

.pricing-features li {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border);
}

.pricing-features li:last-child {
  border-bottom: none;
}

.badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-accent);
  color: white;
  padding: 0.25rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
}

/* ============================================================================
CTA SECTION
============================================================================ */
.cta-section {
  padding: 5rem 0;
  background: var(--color-accent);
  color: white;
  text-align: center;
}

.cta-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.cta-subtitle {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.9;
}

.cta-section .btn {
  background: white;
  color: var(--color-accent);
}

.cta-section .btn:hover {
  background: var(--color-accent-light);
  transform: translateY(-2px);
}

/* ============================================================================
FOOTER
============================================================================ */
.footer {
  padding: 3rem 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  text-align: center;
  color: var(--color-text-secondary);
}

.footer-text {
  margin-bottom: 1.5rem;
  line-height: 1.6;
  font-size: 0.95rem;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.footer-text a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 600;
}

.footer-text a:hover {
  text-decoration: underline;
}

.footer-copyright {
  font-size: 0.875rem;
  opacity: 0.8;
}

/* ============================================================================
SCROLL ANIMATIONS (Intersection Observer)
============================================================================ */
[data-animate] {
  opacity: 0;
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

[data-animate="fade-up"] {
  transform: translateY(30px);
}

[data-animate="fade-right"] {
  transform: translateX(-30px);
}

[data-animate="fade-left"] {
  transform: translateX(30px);
}

[data-animate].is-visible {
  opacity: 1;
  transform: translate(0, 0);
}

/* ============================================================================
DEMO PAGE SPECIFIC STYLES
============================================================================ */
.demo-header {
  margin-bottom: 3rem;
  text-align: center;
}

.back-link {
  display: inline-flex;
  align-items: center;
  color: var(--color-accent);
  text-decoration: none;
  margin-bottom: 1.5rem;
  font-weight: 600;
  transition: transform 0.2s, color 0.2s;
}

.back-link:hover {
  transform: translateX(-5px);
  color: var(--color-accent-hover);
}

.demo-section {
  margin-bottom: 2rem;
}

.demo-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--color-text-primary);
}

.demo-description {
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  line-height: 1.7;
}

.altauri-block, .how-it-works-block {
  background: var(--color-surface);
  padding: 2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  margin-bottom: 2rem;
}

.altauri-block h3, .how-it-works-block h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  color: var(--color-accent);
}

.how-it-works-block ul {
  list-style: none;
  padding-left: 0;
}

.how-it-works-block li {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
  position: relative;
  color: var(--color-text-secondary);
}

.how-it-works-block li::before {
  content: '•';
  color: var(--color-accent);
  font-weight: bold;
  position: absolute;
  left: 0;
  font-size: 1.2rem;
  line-height: 1.4;
}

/*
АНИМАЦИЯ "ГАРМОШКА" (Vertical Reveal)
Раскрытие сверху вниз через scaleY + opacity.
Работает на GPU, не вызывает reflow, безопасно для OpenFL canvas.
*/
@keyframes accordionReveal {
  0% {
    opacity: 0;
    transform: scaleY(0);
    transform-origin: top;
  }
  100% {
    opacity: 1;
    transform: scaleY(1);
    transform-origin: top;
  }
}

#interactive-runtime {
  width: 100%;
  max-width: 1024px;
  height: 600px;
  margin: 0 auto 2rem auto;
  background: #1E1E1E;
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  box-shadow: var(--shadow-lg);
  transform-origin: top center;
  animation: accordionReveal 0.7s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

/* Canvas внутри не должен иметь своих transition */
#interactive-runtime canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
  transition: none !important;
  animation: none !important;
}