/* ==========================================================================
   ElectroPanel Designer — Premium Engineering Design System
   dinpanel.ru Landing Page Stylesheet (100% Offline & Pure Vanilla CSS)
   ========================================================================== */

:root {
  /* Color Palette: Dark Engineering Slate */
  --bg-primary: #090b10;
  --bg-secondary: #0f131c;
  --bg-tertiary: #161b26;
  --bg-card: rgba(22, 27, 38, 0.75);
  --bg-card-hover: rgba(30, 37, 52, 0.85);
  --bg-elevated: #1e2536;

  /* Borders & Dividers */
  --border-subtle: rgba(255, 255, 255, 0.07);
  --border-medium: rgba(255, 255, 255, 0.14);
  --border-accent: rgba(59, 130, 246, 0.35);

  /* Typography */
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  /* Electrical Signal Accents */
  --accent-blue: #3b82f6;
  --accent-blue-hover: #2563eb;
  --accent-blue-glow: rgba(59, 130, 246, 0.25);

  --accent-emerald: #10b981;
  --accent-emerald-glow: rgba(16, 185, 129, 0.2);

  --accent-amber: #f59e0b;
  --accent-amber-glow: rgba(245, 158, 11, 0.2);

  --accent-red: #ef4444;
  --accent-red-glow: rgba(239, 68, 68, 0.2);

  --accent-purple: #8b5cf6;
  --accent-purple-glow: rgba(139, 92, 246, 0.2);

  --accent-cyan: #06b6d4;

  /* Font Stacks (100% Offline System Fonts) */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono", Consolas, "Courier New", monospace;

  /* Spacing & Layout */
  --container-max: 1240px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
}

/* Focus states for WCAG AA compliance */
a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 3px;
}

/* Background Grids & Ambient Lighting */
.bg-ambient-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background-image: 
    radial-gradient(circle at 50% 15%, rgba(59, 130, 246, 0.08) 0%, transparent 60%),
    radial-gradient(circle at 85% 60%, rgba(16, 185, 129, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 15% 85%, rgba(139, 92, 246, 0.05) 0%, transparent 50%),
    linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 100% 100%, 48px 48px, 48px 48px;
}

/* Typography Utilities */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

p {
  color: var(--text-secondary);
}

.mono {
  font-family: var(--font-mono);
}

.text-gradient {
  background: linear-gradient(135deg, #ffffff 30%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-gradient-blue {
  background: linear-gradient(135deg, #60a5fa 0%, #3b82f6 50%, #8b5cf6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-gradient-gold {
  background: linear-gradient(135deg, #fde68a 0%, #f59e0b 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Layout Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* ==========================================================================
   Navigation Bar
   ========================================================================== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(9, 11, 16, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: border-color var(--transition-normal);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-icon {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  border: 1px solid rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  box-shadow: 0 0 16px var(--accent-blue-glow);
}

.brand-info {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.brand-sub {
  font-size: 10.5px;
  font-family: var(--font-mono);
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  color: #ffffff;
  box-shadow: 0 4px 18px var(--accent-blue-glow);
  border-color: rgba(255, 255, 255, 0.15);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%);
  box-shadow: 0 6px 24px rgba(59, 130, 246, 0.4);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--border-medium);
  backdrop-filter: blur(12px);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-1px);
}

.btn-sm {
  padding: 7px 14px;
  font-size: 13px;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 16px;
  border-radius: var(--radius-md);
}

/* Mobile Menu Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  padding-top: 64px;
  padding-bottom: 72px;
  text-align: center;
  position: relative;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid var(--border-accent);
  color: #93c5fd;
  font-size: 12px;
  font-family: var(--font-mono);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 24px;
}

.pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--accent-emerald);
  box-shadow: 0 0 8px var(--accent-emerald);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.2); }
}

.hero-title {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.12;
  margin-bottom: 22px;
  max-width: 960px;
  margin-left: auto;
  margin-right: auto;
}

.hero-description {
  font-size: clamp(16px, 2vw, 19px);
  color: var(--text-secondary);
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 36px;
  line-height: 1.6;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.hero-subtext {
  font-size: 13px;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-subtext span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* Metric Highlights Bar */
.metrics-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 1040px;
  margin: 0 auto 56px auto;
}

.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(12px);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  text-align: left;
  transition: all var(--transition-normal);
}

.metric-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-2px);
}

.metric-value {
  font-size: 26px;
  font-weight: 800;
  color: var(--text-primary);
  font-family: var(--font-mono);
  line-height: 1.1;
  margin-bottom: 4px;
}

.metric-label {
  font-size: 12.5px;
  color: var(--text-muted);
  font-weight: 500;
}

/* ==========================================================================
   Hero Visual Showcase (Interactive Frame)
   ========================================================================== */
.hero-showcase {
  max-width: 1160px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-medium);
  background: var(--bg-secondary);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.6), 0 0 40px rgba(59, 130, 246, 0.1);
  overflow: hidden;
  position: relative;
}

.showcase-header {
  background: #141824;
  border-bottom: 1px solid var(--border-subtle);
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.window-dots {
  display: flex;
  gap: 7px;
}

.window-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}
.dot-red { background: #ef4444; }
.dot-yellow { background: #f59e0b; }
.dot-green { background: #10b981; }

.showcase-tabs {
  display: flex;
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 3px;
  gap: 2px;
}

.showcase-tab-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.showcase-tab-btn.active {
  background: var(--accent-blue);
  color: #ffffff;
}

.showcase-tab-btn:hover:not(.active) {
  color: var(--text-primary);
}

.showcase-badge {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--text-dim);
}

.showcase-viewport {
  position: relative;
  width: 100%;
  background: #0d1017;
  overflow: hidden;
}

.showcase-img {
  width: 100%;
  height: auto;
  display: block;
  transition: opacity var(--transition-normal);
}

.showcase-overlay-bar {
  position: absolute;
  bottom: 0;
  inset-x: 0;
  background: linear-gradient(to top, rgba(9, 11, 16, 0.95) 0%, rgba(9, 11, 16, 0.4) 60%, transparent 100%);
  padding: 32px 24px 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.showcase-overlay-tags {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.tag-pill {
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.tag-pill.success {
  background: rgba(16, 185, 129, 0.12);
  border-color: rgba(16, 185, 129, 0.3);
  color: #6ee7b7;
}

/* ==========================================================================
   Section: Problem & Comparison («Было / Стало»)
   ========================================================================== */
.section {
  padding-top: 88px;
  padding-bottom: 88px;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 56px auto;
}

.section-eyebrow {
  font-size: 12px;
  font-family: var(--font-mono);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-blue);
  margin-bottom: 12px;
  display: block;
}

.section-title {
  font-size: clamp(26px, 3.5vw, 40px);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Comparison Grid */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.comparison-col {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
}

.comparison-col.old {
  border-color: rgba(239, 68, 68, 0.2);
  background: linear-gradient(180deg, rgba(239, 68, 68, 0.04) 0%, rgba(22, 27, 38, 0.7) 100%);
}

.comparison-col.new {
  border-color: rgba(16, 185, 129, 0.3);
  background: linear-gradient(180deg, rgba(16, 185, 129, 0.05) 0%, rgba(22, 27, 38, 0.7) 100%);
  box-shadow: 0 12px 36px rgba(16, 185, 129, 0.08);
}

.col-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.col-title {
  font-size: 18px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.col-badge {
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  text-transform: uppercase;
}

.old .col-badge {
  background: rgba(239, 68, 68, 0.15);
  color: #fca5a5;
}

.new .col-badge {
  background: rgba(16, 185, 129, 0.2);
  color: #6ee7b7;
}

.comparison-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.comparison-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.item-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 12px;
  margin-top: 2px;
}

.old .item-icon {
  background: rgba(239, 68, 68, 0.15);
  color: #ef4444;
}

.new .item-icon {
  background: rgba(16, 185, 129, 0.2);
  color: #10b981;
}

.item-content h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}

.item-content p {
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ==========================================================================
   Section: Interactive DIN Simulator / Live Playground
   ========================================================================== */
.simulator-card {
  background: #111520;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  margin-top: 36px;
}

.sim-header {
  background: #181d2c;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
  flex-wrap: wrap;
  gap: 12px;
}

.sim-title {
  font-size: 15px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.sim-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
}

.sim-rail-area {
  padding: 28px;
  background: #0d1018;
  border-right: 1px solid var(--border-subtle);
}

.sim-rail-row {
  margin-bottom: 24px;
}

.sim-rail-label {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--text-dim);
  margin-bottom: 8px;
  text-transform: uppercase;
}

.sim-rail-track {
  background: linear-gradient(180deg, #374151 0%, #6b7280 50%, #1f2937 100%);
  border-radius: 4px;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  overflow-x: auto;
}

.sim-breaker {
  background: #f1f5f9;
  color: #0f172a;
  border-radius: 4px;
  padding: 8px 12px;
  min-width: 72px;
  text-align: center;
  cursor: pointer;
  user-select: none;
  transition: all var(--transition-fast);
  border: 1px solid #94a3b8;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.sim-breaker:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.sim-breaker.active {
  border-top: 3px solid var(--accent-emerald);
}

.sim-breaker.off {
  opacity: 0.6;
  border-top: 3px solid var(--accent-red);
  background: #cbd5e1;
}

.sim-breaker-tag {
  font-size: 10px;
  font-family: var(--font-mono);
  font-weight: 700;
  color: #475569;
}

.sim-breaker-name {
  font-size: 11px;
  font-weight: 700;
  white-space: nowrap;
}

.sim-breaker-load {
  font-size: 10px;
  font-family: var(--font-mono);
  color: #2563eb;
  font-weight: 600;
}

.sim-breaker-toggle {
  display: inline-block;
  width: 14px;
  height: 8px;
  border-radius: 4px;
  background: var(--accent-emerald);
  margin-top: 4px;
}

.sim-breaker.off .sim-breaker-toggle {
  background: var(--accent-red);
}

/* Simulator Telemetry Panel */
.sim-telemetry {
  padding: 24px;
  background: #131724;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.telemetry-title {
  font-size: 12px;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--text-dim);
  text-transform: uppercase;
}

.telemetry-power {
  font-size: 32px;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--text-primary);
}

.telemetry-power span {
  font-size: 16px;
  color: var(--text-muted);
  font-weight: 500;
}

.phase-meter {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.phase-info {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  font-family: var(--font-mono);
}

.phase-bar-track {
  height: 8px;
  border-radius: 4px;
  background: var(--bg-primary);
  overflow: hidden;
}

.phase-bar-fill {
  height: 100%;
  border-radius: 4px;
  transition: width 0.3s ease;
}

.phase-l1 { background: var(--accent-red); }
.phase-l2 { background: var(--accent-blue); }
.phase-l3 { background: var(--accent-emerald); }

.sim-ai-feedback {
  background: rgba(139, 92, 246, 0.1);
  border: 1px solid rgba(139, 92, 246, 0.3);
  border-radius: var(--radius-sm);
  padding: 12px;
  font-size: 12px;
  color: #ddd6fe;
  line-height: 1.4;
}

/* ==========================================================================
   Section: Feature Blocks ( возможности с сгенерированными картинками )
   ========================================================================== */
.features-container {
  display: flex;
  flex-direction: column;
  gap: 80px;
}

.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.feature-row.reverse {
  direction: rtl;
}

.feature-row.reverse > * {
  direction: ltr;
}

.feature-content {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.feature-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11.5px;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-blue);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.feature-title {
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 800;
  line-height: 1.25;
}

.feature-desc {
  font-size: 15.5px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 8px;
}

.feature-list-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14.5px;
  color: var(--text-secondary);
}

.feature-list-item::before {
  content: "✓";
  color: var(--accent-emerald);
  font-weight: bold;
  flex-shrink: 0;
}

.feature-visual-wrapper {
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
  transition: all var(--transition-normal);
  position: relative;
}

.feature-visual-wrapper:hover {
  border-color: rgba(59, 130, 246, 0.4);
  transform: translateY(-4px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6), 0 0 30px rgba(59, 130, 246, 0.15);
}

.feature-visual-img {
  width: 100%;
  height: auto;
  display: block;
}

/* ==========================================================================
   Section: How It Works (4 шага)
   ========================================================================== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  position: relative;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  gap: 14px;
  position: relative;
  transition: all var(--transition-normal);
}

.step-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-4px);
}

.step-num {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid var(--border-accent);
  color: #60a5fa;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-card h3 {
  font-size: 17px;
  font-weight: 700;
}

.step-card p {
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ==========================================================================
   Section: Pricing (Тарифы)
   ========================================================================== */
.pricing-switcher {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 48px;
}

.switch-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 13.5px;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.switch-btn.active {
  background: var(--accent-blue);
  color: #ffffff;
  border-color: var(--accent-blue);
  box-shadow: 0 0 16px var(--accent-blue-glow);
}

.discount-tag {
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 700;
  color: #34d399;
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.3);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
}

.pricing-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-4px);
}

.pricing-card.featured {
  background: #131826;
  border: 2px solid var(--accent-blue);
  box-shadow: 0 16px 40px rgba(59, 130, 246, 0.15);
  transform: translateY(-8px);
}

.pricing-card.featured:hover {
  transform: translateY(-12px);
}

.popular-ribbon {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #3b82f6, #2563eb);
  color: #ffffff;
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 14px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
}

.tier-name {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.tier-price-row {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 4px;
}

.tier-price {
  font-size: 38px;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--text-primary);
  line-height: 1;
}

.tier-period {
  font-size: 14px;
  color: var(--text-muted);
}

.tier-subtext {
  font-size: 12.5px;
  color: var(--text-dim);
  margin-bottom: 24px;
  min-height: 18px;
}

.tier-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.tier-feature-item {
  font-size: 13.5px;
  color: var(--text-secondary);
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.tier-feature-item.included::before {
  content: "✓";
  color: var(--accent-emerald);
  font-weight: bold;
  flex-shrink: 0;
}

.tier-feature-item.excluded {
  color: var(--text-dim);
}

.tier-feature-item.excluded::before {
  content: "✗";
  color: #ef4444;
  font-weight: bold;
  flex-shrink: 0;
}

/* ==========================================================================
   Section: FAQ (Accordion)
   ========================================================================== */
.faq-container {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  backdrop-filter: blur(12px);
  transition: border-color var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--border-medium);
}

.faq-item[open] {
  border-color: var(--border-accent);
}

.faq-summary {
  padding: 18px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-icon {
  font-size: 18px;
  color: var(--text-muted);
  transition: transform var(--transition-normal);
  font-family: var(--font-mono);
}

.faq-item[open] .faq-icon {
  transform: rotate(45deg);
  color: var(--accent-blue);
}

.faq-body {
  padding: 0 24px 20px 24px;
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   Section: Bottom CTA & Footer
   ========================================================================== */
.cta-banner {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.15) 0%, rgba(22, 27, 38, 0.8) 100%);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-xl);
  padding: 64px 32px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5), 0 0 50px rgba(59, 130, 246, 0.15);
}

.cta-title {
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-desc {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 32px auto;
}

.footer {
  border-top: 1px solid var(--border-subtle);
  background: #06070a;
  padding: 48px 0 32px 0;
  margin-top: 80px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 32px;
  margin-bottom: 40px;
}

.footer-brand {
  max-width: 360px;
}

.footer-desc {
  font-size: 13.5px;
  color: var(--text-dim);
  margin-top: 12px;
  line-height: 1.5;
}

.footer-links-group {
  display: flex;
  gap: 60px;
  flex-wrap: wrap;
}

.footer-col h4 {
  font-size: 13px;
  font-family: var(--font-mono);
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}

.footer-nav {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-nav a {
  font-size: 13.5px;
  color: var(--text-dim);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 12.5px;
  font-family: var(--font-mono);
  color: var(--text-dim);
}

.footer-badges {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ==========================================================================
   Responsive Adaptations (360px, 768px, 1024px, 1440px)
   ========================================================================== */
@media (max-width: 1024px) {
  .feature-row {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .feature-row.reverse {
    direction: ltr;
  }

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

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }

  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-4px);
  }

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

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

  .sim-rail-area {
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
  }
}

@media (max-width: 768px) {
  .nav-links, .nav-actions .btn-secondary {
    display: none;
  }

  .mobile-toggle {
    display: block;
  }

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

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

  .hero-title {
    font-size: 32px;
  }

  .metrics-strip {
    grid-template-columns: 1fr;
  }

  .showcase-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .showcase-tabs {
    width: 100%;
    overflow-x: auto;
  }

  .footer-links-group {
    gap: 32px;
  }
}

@media (max-width: 480px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero {
    padding-top: 40px;
    padding-bottom: 48px;
  }

  .hero-cta-group .btn {
    width: 100%;
  }

  .cta-banner {
    padding: 40px 18px;
  }
}