/* ==========================================================================
   VisualProekt.ru - Курсы 3D-моделирования памятников
   Modern 2026 Edition: Interactive, Ultra-fast, High-conversion
   ========================================================================== */

:root {
  /* Brand Palette */
  --color-primary: #2d3b8f;
  --color-primary-dark: #1e2968;
  --color-primary-light: #4454b5;
  --color-primary-glow: rgba(45, 59, 143, 0.15);
  
  --color-accent: #00a86b;
  --color-accent-hover: #008f5b;
  --color-accent-light: #e6f7f0;
  
  --color-purple: #7c3aed;
  --color-purple-light: #ede9fe;
  
  --color-telegram: #229ed9;
  --color-telegram-dark: #1980b3;
  --color-instagram: #c13584;
  
  /* Neutrals & Dark Theme Accents */
  --color-bg-body: #f8fafc;
  --color-bg-card: #ffffff;
  --color-bg-alt: #eef2f7;
  --color-bg-dark: #0f172a;
  --color-bg-dark-surface: #1e293b;
  
  --color-text-main: #1e293b;
  --color-text-muted: #64748b;
  --color-text-light: #94a3b8;
  --color-text-inverse: #ffffff;
  
  --color-border: #e2e8f0;
  --color-border-dark: #334155;
  
  /* Typography */
  --font-sans: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', Oxygen, Ubuntu, Cantarell, sans-serif;
  
  /* Layout & Spacing */
  --container-max-width: 1200px;
  --container-padding: 20px;
  --border-radius-sm: 8px;
  --border-radius-md: 14px;
  --border-radius-lg: 20px;
  --border-radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 28px rgba(0,0,0,0.1), 0 4px 10px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 40px rgba(0,0,0,0.15), 0 8px 16px rgba(0,0,0,0.06);
  --shadow-primary: 0 8px 24px rgba(45, 59, 143, 0.25);
  --shadow-accent: 0 8px 24px rgba(0, 168, 107, 0.25);

  --transition-fast: 0.2s ease;
  --transition-smooth: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

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

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

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

button, input, select, textarea {
  font-family: inherit;
  font-size: 1rem;
}

ul, ol {
  list-style: none;
}

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

.container-narrow {
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-weight: 600;
  padding: 14px 28px;
  border-radius: var(--border-radius-full);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-smooth);
  text-align: center;
  user-select: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #ffffff;
  box-shadow: var(--shadow-primary);
}
.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(45, 59, 143, 0.35);
  color: #fff;
}

.btn-accent {
  background: linear-gradient(135deg, #00b374, #008f5b);
  color: #ffffff;
  box-shadow: var(--shadow-accent);
}
.btn-accent:hover {
  background: linear-gradient(135deg, #00c982, #00a86b);
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(0, 168, 107, 0.35);
  color: #fff;
}

.btn-telegram {
  background: linear-gradient(135deg, #27a7e7, #1789c4);
  color: #ffffff;
  box-shadow: 0 8px 20px rgba(39, 167, 231, 0.3);
}
.btn-telegram:hover {
  background: linear-gradient(135deg, #3db4ee, #1e96d4);
  transform: translateY(-2px);
  color: #fff;
}

.btn-purple {
  background: linear-gradient(135deg, #8b5cf6, #6d28d9);
  color: #ffffff;
  box-shadow: 0 8px 24px rgba(124, 58, 237, 0.3);
}
.btn-purple:hover {
  background: linear-gradient(135deg, #9f75ff, #7c3aed);
  transform: translateY(-2px);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary);
  color: #ffffff;
  transform: translateY(-2px);
}

.btn-outline-white {
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(8px);
}
.btn-outline-white:hover {
  background: #ffffff;
  color: var(--color-primary-dark);
  border-color: #ffffff;
}

.btn-lg {
  padding: 18px 36px;
  font-size: 1.125rem;
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.875rem;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--border-radius-full);
  font-size: 0.85rem;
  font-weight: 600;
}

.badge-primary {
  background-color: var(--color-primary-glow);
  color: var(--color-primary);
}

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

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

.badge-warning {
  background-color: #fef3c7;
  color: #b45309;
}

.badge-white {
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(6px);
}

/* Typography Helpers */
.section-title-wrap {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 50px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--color-text-main);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.highlight {
  color: var(--color-primary);
  position: relative;
}

.highlight-accent {
  color: var(--color-accent);
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
  transition: all var(--transition-fast);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-logo img {
  height: 42px;
  width: auto;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--color-text-main);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition-fast);
}

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

.nav-link:hover::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 18px;
}

.header-phone {
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--color-primary);
  white-space: nowrap;
}

.mobile-menu-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
  font-size: 1.5rem;
  color: var(--color-text-main);
}

/* Hero Section */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 100px;
  padding-bottom: 70px;
  color: #ffffff;
  background: #0f172a;
  overflow: hidden;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
  filter: brightness(0.85);
  transform: scale(1.02);
  transition: transform 10s ease;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.94) 0%, rgba(30, 41, 59, 0.85) 60%, rgba(45, 59, 143, 0.7) 100%);
}

.hero-content {
  position: relative;
  z-index: 10;
  max-width: 840px;
}

.hero-badge {
  margin-bottom: 24px;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.15;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.hero-title .text-gradient {
  background: linear-gradient(135deg, #ffffff 30%, #93c5fd 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-bullets {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin-bottom: 36px;
}

.hero-bullet-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--border-radius-md);
  padding: 16px 20px;
  backdrop-filter: blur(10px);
}

.hero-bullet-icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  background: #00b374;
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 0.9rem;
}

.hero-bullet-text {
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1.4;
}

.hero-bullet-text strong {
  color: #86efac;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-bottom: 32px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  font-size: 0.92rem;
  color: var(--color-text-light);
}

.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Trust Bar / Mission Card */
.trust-section {
  padding: 40px 0;
  margin-top: -30px;
  position: relative;
  z-index: 20;
}

.trust-card {
  background: var(--color-bg-card);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-xl);
  padding: 30px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  border: 1px solid var(--color-border);
}

.trust-card-left {
  display: flex;
  align-items: center;
  gap: 20px;
}

.trust-avatar {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--color-primary);
  flex-shrink: 0;
}

.trust-text h4 {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: 4px;
}

.trust-text p {
  color: var(--color-text-muted);
  font-size: 0.98rem;
}

.trust-card-stats {
  display: flex;
  gap: 36px;
  flex-shrink: 0;
}

.trust-stat-num {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
}

.trust-stat-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ==========================================================================
   NEW MODULE 1: Interactive 3D Viewer (WebGL)
   ========================================================================== */
.viewer-3d-section {
  padding: 90px 0;
  background: linear-gradient(180deg, #ffffff 0%, #f1f5f9 100%);
}

.viewer-3d-card {
  background: #0f172a;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  border: 1px solid #1e293b;
  position: relative;
}

.viewer-3d-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 26px;
  background: #1e293b;
  color: #ffffff;
  border-bottom: 1px solid #334155;
  flex-wrap: wrap;
  gap: 14px;
}

.viewer-3d-title {
  font-size: 1.15rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.viewer-3d-title span {
  color: #38bdf8;
}

.viewer-3d-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.stone-btn, .viewer-tab-btn {
  background: #0f172a;
  border: 1px solid #334155;
  color: #e2e8f0;
  padding: 7px 14px;
  border-radius: var(--border-radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.stone-btn .color-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: inline-block;
}

.stone-btn[data-stone="gabbro"] .color-dot { background: #111111; border: 1px solid #666; }
.stone-btn[data-stone="pokost"] .color-dot { background: #9ca3af; }
.stone-btn[data-stone="leznik"] .color-dot { background: #991b1b; }

.stone-btn.active, .stone-btn:hover,
.viewer-tab-btn.active, .viewer-tab-btn:hover {
  background: var(--color-primary);
  border-color: #38bdf8;
  color: #ffffff;
}

.viewer-3d-canvas-wrap {
  width: 100%;
  height: 520px;
  position: relative;
  cursor: grab;
  touch-action: none;
}

.viewer-3d-canvas-wrap:active {
  cursor: grabbing;
}

.viewer-3d-hint {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(15, 23, 42, 0.85);
  color: #94a3b8;
  padding: 8px 18px;
  border-radius: var(--border-radius-full);
  font-size: 0.85rem;
  pointer-events: none;
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  white-space: nowrap;
}

/* ==========================================================================
   NEW MODULE 2: Before & After Split Slider
   ========================================================================== */
.before-after-section {
  padding: 90px 0;
  background: #ffffff;
}

.before-after-container {
  max-width: 960px;
  margin: 0 auto;
}

.ba-slider-wrap {
  position: relative;
  width: 100%;
  height: 480px;
  overflow: hidden;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-xl);
  user-select: none;
  touch-action: none;
  border: 2px solid var(--color-border);
}

.ba-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  pointer-events: none;
}

.ba-before {
  position: absolute;
  top: 0;
  left: 0;
  width: 50%;
  height: 100%;
  overflow: hidden;
  z-index: 2;
  border-right: 3px solid #ffffff;
}

.ba-before .ba-image {
  width: 100%;
  min-width: 960px;
  height: 100%;
}

.ba-label {
  position: absolute;
  bottom: 24px;
  padding: 8px 18px;
  border-radius: var(--border-radius-full);
  font-size: 0.9rem;
  font-weight: 700;
  color: #fff;
  z-index: 5;
  backdrop-filter: blur(8px);
}

.ba-label.before-label {
  left: 24px;
  background: rgba(220, 38, 38, 0.85);
}

.ba-label.after-label {
  right: 24px;
  background: rgba(0, 168, 107, 0.85);
}

.ba-handle {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 4px;
  background: #ffffff;
  z-index: 10;
  cursor: ew-resize;
  transform: translateX(-50%);
}

.ba-handle-circle {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #ffffff;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-weight: bold;
  font-size: 1.1rem;
}

/* ==========================================================================
   NEW MODULE 3: ROI Calculator
   ========================================================================== */
.roi-section {
  padding: 100px 0;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: #ffffff;
}

.roi-card {
  background: var(--color-bg-dark-surface);
  border-radius: var(--border-radius-lg);
  padding: 48px;
  border: 1px solid var(--color-border-dark);
  box-shadow: var(--shadow-xl);
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 50px;
  align-items: center;
}

.roi-input-group {
  margin-bottom: 28px;
}

.roi-input-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 12px;
}

.roi-label {
  font-size: 1.05rem;
  font-weight: 600;
  color: #e2e8f0;
}

.roi-value-display {
  font-size: 1.4rem;
  font-weight: 800;
  color: #38bdf8;
}

.roi-range {
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: #334155;
  outline: none;
  cursor: pointer;
  accent-color: #00a86b;
}

.roi-results-box {
  background: linear-gradient(135deg, #1e293b, #0f172a);
  border-radius: var(--border-radius-md);
  padding: 36px;
  border: 1px solid rgba(56, 189, 248, 0.3);
  text-align: center;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.roi-result-label {
  font-size: 0.95rem;
  color: #94a3b8;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.roi-profit-number {
  font-size: 3rem;
  font-weight: 900;
  color: #4ade80;
  line-height: 1.1;
  margin-bottom: 14px;
}

.roi-payback-badge {
  display: inline-block;
  background: rgba(74, 222, 128, 0.15);
  color: #86efac;
  border: 1px solid #22c55e;
  padding: 6px 16px;
  border-radius: var(--border-radius-full);
  font-weight: 700;
  font-size: 0.92rem;
  margin-bottom: 24px;
}

/* ==========================================================================
   NEW MODULE 4: Interactive Quiz (3 Steps)
   ========================================================================== */
.quiz-section {
  padding: 100px 0;
  background-color: var(--color-bg-alt);
}

.quiz-card {
  background: #ffffff;
  border-radius: var(--border-radius-lg);
  padding: 44px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
  max-width: 820px;
  margin: 0 auto;
}

.quiz-progress-wrap {
  margin-bottom: 30px;
}

.quiz-progress-text {
  display: flex;
  justify-content: space-between;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.quiz-progress-bar {
  width: 100%;
  height: 8px;
  background: #e2e8f0;
  border-radius: 4px;
  overflow: hidden;
}

.quiz-progress-fill {
  height: 100%;
  width: 33%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transition: width 0.4s ease;
}

.quiz-step {
  display: none;
}

.quiz-step.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.quiz-question {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: 24px;
}

.quiz-options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 30px;
}

.quiz-option-card {
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius-md);
  padding: 18px 20px;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 14px;
  user-select: none;
}

.quiz-option-card:hover {
  border-color: var(--color-primary);
  background: #f8faff;
}

.quiz-option-card.selected {
  border-color: var(--color-primary);
  background: var(--color-primary-glow);
}

.quiz-radio {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid #94a3b8;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.quiz-option-card.selected .quiz-radio {
  border-color: var(--color-primary);
}

.quiz-option-card.selected .quiz-radio::after {
  content: '';
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-primary);
}

.quiz-option-text strong {
  display: block;
  font-size: 1rem;
  color: var(--color-text-main);
}

.quiz-option-text span {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.quiz-nav-btns {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.quiz-result-box {
  text-align: center;
  padding: 20px 0;
}

.quiz-rec-tariff {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-primary);
  margin: 12px 0 6px;
}

.quiz-bonus-badge {
  display: inline-block;
  background: #fef3c7;
  color: #b45309;
  padding: 8px 20px;
  border-radius: var(--border-radius-full);
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 24px;
}

/* ==========================================================================
   NEW MODULE 5: Free Demo Lesson (Lead Magnet)
   ========================================================================== */
.free-lesson-section {
  padding: 80px 0;
  background: linear-gradient(135deg, #1e2968 0%, #2d3b8f 100%);
  color: #ffffff;
}

.free-lesson-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--border-radius-lg);
  padding: 44px;
  backdrop-filter: blur(12px);
}

.free-lesson-content h3 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.free-lesson-content p {
  color: #cbd5e1;
  font-size: 1.1rem;
  max-width: 620px;
}

.free-lesson-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex-shrink: 0;
}

/* ==========================================================================
   NEW MODULE 6: AI / Neural Networks 2026 Module
   ========================================================================== */
.ai-module-section {
  padding: 100px 0;
  background: #ffffff;
}

.ai-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.ai-card {
  background: linear-gradient(180deg, #ffffff 0%, #f9fafb 100%);
  border-radius: var(--border-radius-md);
  padding: 36px;
  border: 2px solid #e5e7eb;
  position: relative;
  transition: all var(--transition-smooth);
}

.ai-card:hover {
  border-color: var(--color-purple);
  box-shadow: 0 14px 30px rgba(124, 58, 237, 0.15);
  transform: translateY(-4px);
}

.ai-card-icon {
  width: 54px;
  height: 54px;
  border-radius: var(--border-radius-md);
  background: var(--color-purple-light);
  color: var(--color-purple);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
}

.ai-card-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: 12px;
}

.ai-card-desc {
  font-size: 0.98rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

/* ==========================================================================
   NEW MODULE 7: Cases "Было -> Стало" & 100% Guarantee
   ========================================================================== */
.cases-section {
  padding: 100px 0;
  background: var(--color-bg-body);
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 50px;
}

.case-card {
  background: #ffffff;
  border-radius: var(--border-radius-lg);
  padding: 32px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.case-company-name {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: 4px;
}

.case-company-city {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

.case-comparison-box {
  margin-bottom: 20px;
  flex-grow: 1;
}

.case-before {
  background: #fef2f2;
  border-left: 3px solid #ef4444;
  padding: 12px 14px;
  border-radius: 4px;
  margin-bottom: 12px;
  font-size: 0.9rem;
  color: #991b1b;
}

.case-after {
  background: #f0fdf4;
  border-left: 3px solid #22c55e;
  padding: 12px 14px;
  border-radius: 4px;
  font-size: 0.9rem;
  color: #166534;
}

.case-result-badge {
  background: var(--color-accent-light);
  color: var(--color-accent);
  padding: 8px 14px;
  border-radius: var(--border-radius-sm);
  font-weight: 700;
  font-size: 0.95rem;
  text-align: center;
}

.guarantee-card {
  background: #ffffff;
  border: 2px solid var(--color-accent);
  border-radius: var(--border-radius-lg);
  padding: 36px 44px;
  display: flex;
  align-items: center;
  gap: 30px;
  box-shadow: var(--shadow-lg);
  margin-top: 30px;
}

.guarantee-badge-icon {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  flex-shrink: 0;
}

.guarantee-text h4 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: 6px;
}

.guarantee-text p {
  font-size: 1rem;
  color: var(--color-text-muted);
}

/* ==========================================================================
   Video Sections
   ========================================================================== */
.video-section {
  padding: 90px 0;
  background-color: var(--color-bg-body);
}

.video-section.alt-bg {
  background-color: var(--color-bg-alt);
}

.video-card-container {
  max-width: 960px;
  margin: 0 auto;
  background: #000;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  position: relative;
}

.video-player-wrapper {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 ratio */
  height: 0;
  overflow: hidden;
  background-color: #000;
}

.video-poster {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  cursor: pointer;
  transition: transform 0.4s ease, filter 0.3s ease;
}

.video-poster:hover {
  transform: scale(1.02);
  filter: brightness(0.9);
}

.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 84px;
  height: 84px;
  border-radius: 50%;
  background: linear-gradient(135deg, #ff0033, #cc0000);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 10px 30px rgba(255, 0, 0, 0.4);
  transition: all var(--transition-smooth);
  border: none;
  z-index: 5;
}

.video-play-btn svg {
  width: 32px;
  height: 32px;
  fill: #fff;
  margin-left: 4px;
}

.video-play-btn:hover {
  transform: translate(-50%, -50%) scale(1.1);
  box-shadow: 0 14px 40px rgba(255, 0, 0, 0.6);
}

.video-frame {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
  display: none;
}

.video-local-player {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: none;
}

.video-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  background: #111827;
  color: #94a3b8;
  font-size: 0.88rem;
}

.video-source-switcher {
  display: flex;
  align-items: center;
  gap: 10px;
}

.video-source-switcher button {
  background: #1f2937;
  color: #e2e8f0;
  border: 1px solid #374151;
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.video-source-switcher button.active {
  background: var(--color-primary);
  border-color: var(--color-primary-light);
  color: #fff;
}

/* Two Courses Section */
.courses-section {
  padding: 100px 0;
  background: #ffffff;
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 36px;
  margin-bottom: 60px;
}

.course-card {
  background: var(--color-bg-card);
  border-radius: var(--border-radius-lg);
  border: 2px solid var(--color-border);
  padding: 44px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-smooth);
}

.course-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-xl);
  transform: translateY(-4px);
}

.course-card.featured {
  border-color: var(--color-primary);
  background: linear-gradient(180deg, #ffffff 0%, #f4f6ff 100%);
  box-shadow: var(--shadow-lg);
}

.course-card.featured::before {
  content: 'РЕКОМЕНДУЕМ';
  position: absolute;
  top: -14px;
  right: 36px;
  background: var(--color-accent);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  padding: 4px 16px;
  border-radius: var(--border-radius-full);
}

.course-card-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.course-icon-wrap {
  width: 60px;
  height: 60px;
  border-radius: var(--border-radius-md);
  background: var(--color-primary-glow);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  flex-shrink: 0;
}

.course-badge-level {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-primary);
}

.course-card-title {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--color-text-main);
  line-height: 1.2;
}

.course-card-desc {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  margin-bottom: 28px;
}

.course-features-list {
  margin-bottom: 32px;
  flex-grow: 1;
}

.course-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
  font-size: 1rem;
  color: var(--color-text-main);
  line-height: 1.45;
}

.course-feature-item svg {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  fill: var(--color-accent);
  margin-top: 3px;
}

.course-card-footer {
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Shop Callout Banner */
.shop-banner {
  background: linear-gradient(135deg, var(--color-primary-dark), #172554);
  border-radius: var(--border-radius-lg);
  padding: 44px;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  box-shadow: var(--shadow-lg);
  margin: 50px auto 0;
}

.shop-banner-content h3 {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.shop-banner-content p {
  color: #cbd5e1;
  font-size: 1.05rem;
  max-width: 620px;
}

/* Workflow / Comparison Section */
.workflow-section {
  padding: 100px 0;
  background-color: var(--color-bg-body);
}

.workflow-steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 50px;
}

.workflow-step-card {
  background: var(--color-bg-card);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-smooth);
}

.workflow-step-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

.workflow-step-img-wrap {
  position: relative;
  width: 100%;
  height: 220px;
  overflow: hidden;
  background: #000;
  cursor: pointer;
}

.workflow-step-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.workflow-step-card:hover .workflow-step-img-wrap img {
  transform: scale(1.08);
}

.workflow-step-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--color-primary);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: var(--border-radius-full);
}

.workflow-step-body {
  padding: 20px;
  text-align: center;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.workflow-step-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text-main);
  line-height: 1.3;
}

.full-render-preview {
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  margin-top: 30px;
  cursor: pointer;
  border: 2px solid var(--color-border);
}

.full-render-preview img {
  width: 100%;
  height: auto;
  transition: transform 0.4s ease;
}

.full-render-preview:hover img {
  transform: scale(1.01);
}

/* Benefits Grid Section */
.benefits-section {
  padding: 100px 0;
  background-color: #ffffff;
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.benefit-card {
  background: var(--color-bg-body);
  border-radius: var(--border-radius-md);
  padding: 32px;
  border: 1px solid var(--color-border);
  transition: all var(--transition-smooth);
}

.benefit-card:hover {
  background: #ffffff;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.benefit-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--border-radius-md);
  background: var(--color-primary-glow);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.benefit-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 12px;
}

.benefit-desc {
  font-size: 0.98rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* System Requirements */
.sysreq-section {
  padding: 90px 0;
  background-color: var(--color-bg-alt);
}

.sysreq-card {
  background: var(--color-bg-card);
  border-radius: var(--border-radius-lg);
  padding: 44px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
}

.sysreq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-top: 32px;
}

.sysreq-col {
  background: var(--color-bg-body);
  border-radius: var(--border-radius-md);
  padding: 30px;
  border: 1px solid var(--color-border);
}

.sysreq-col.recommended {
  border-color: var(--color-primary);
  background: #f8faff;
}

.sysreq-col-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.sysreq-col-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--color-text-main);
}

.sysreq-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 14px;
  font-size: 0.98rem;
  color: var(--color-text-main);
}

.sysreq-list li strong {
  color: var(--color-primary-dark);
}

/* Reviews / Social Proof */
.reviews-section {
  padding: 100px 0;
  background: #ffffff;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.review-card {
  background: var(--color-bg-body);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: all var(--transition-smooth);
  position: relative;
}

.review-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary);
}

.review-img-wrap {
  width: 100%;
  height: 280px;
  overflow: hidden;
  position: relative;
}

.review-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
  transition: transform 0.4s ease;
}

.review-card:hover .review-img-wrap img {
  transform: scale(1.05);
}

.review-zoom-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: rgba(45, 59, 143, 0.85);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: all var(--transition-fast);
}

.review-card:hover .review-zoom-icon {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.reviews-more-btn-wrap {
  text-align: center;
  margin-top: 40px;
}

/* Pricing & Packages Section */
.pricing-section {
  padding: 100px 0;
  background: linear-gradient(180deg, var(--color-bg-body) 0%, #e2e8f0 100%);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 36px;
  max-width: 960px;
  margin: 0 auto;
}

.pricing-card {
  background: #ffffff;
  border-radius: var(--border-radius-lg);
  padding: 44px;
  box-shadow: var(--shadow-lg);
  border: 2px solid var(--color-border);
  display: flex;
  flex-direction: column;
  position: relative;
}

.pricing-card.special {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-xl);
}

.pricing-card-header {
  margin-bottom: 24px;
  text-align: center;
}

.pricing-tag {
  font-size: 0.85rem;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.pricing-name {
  font-size: 2rem;
  font-weight: 900;
  color: var(--color-text-main);
  margin-bottom: 12px;
}

.pricing-price-box {
  background: var(--color-bg-body);
  border-radius: var(--border-radius-md);
  padding: 20px;
  margin-bottom: 24px;
  text-align: center;
}

.pricing-status {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--color-primary-dark);
}

.pricing-note {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

.pricing-features {
  margin-bottom: 36px;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 14px;
  font-size: 0.98rem;
  color: var(--color-text-main);
}

.pricing-feature-item svg {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  fill: var(--color-accent);
  margin-top: 3px;
}

/* Lead Capture Section */
.lead-section {
  padding: 100px 0;
  background: var(--color-bg-dark);
  color: #ffffff;
  position: relative;
  overflow: hidden;
}

.lead-section::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(45, 59, 143, 0.4) 0%, transparent 70%);
  pointer-events: none;
}

.lead-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.lead-info h2 {
  font-size: 2.5rem;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 20px;
}

.lead-info p {
  color: var(--color-text-light);
  font-size: 1.15rem;
  line-height: 1.6;
  margin-bottom: 30px;
}

.lead-form-card {
  background: var(--color-bg-dark-surface);
  border-radius: var(--border-radius-lg);
  padding: 40px;
  border: 1px solid var(--color-border-dark);
  box-shadow: var(--shadow-xl);
}

.lead-form-title {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 20px;
  color: #ffffff;
  text-align: center;
}

.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: #cbd5e1;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 14px 18px;
  background: #0f172a;
  border: 1px solid #334155;
  border-radius: var(--border-radius-sm);
  color: #ffffff;
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--color-primary-light);
  box-shadow: 0 0 0 3px rgba(45, 59, 143, 0.25);
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
}

.form-consent {
  font-size: 0.78rem;
  color: #94a3b8;
  margin-top: 14px;
  text-align: center;
}

.form-consent a {
  text-decoration: underline;
  color: #cbd5e1;
}

.form-divider {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 24px 0;
  color: #64748b;
  font-size: 0.88rem;
}

.form-divider::before, .form-divider::after {
  content: '';
  flex-grow: 1;
  height: 1px;
  background: #334155;
}

/* Team Section */
.team-section {
  padding: 100px 0;
  background: #ffffff;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 36px;
  max-width: 900px;
  margin: 0 auto;
}

.team-card {
  text-align: center;
  background: var(--color-bg-body);
  border-radius: var(--border-radius-lg);
  padding: 36px 24px;
  border: 1px solid var(--color-border);
  transition: all var(--transition-smooth);
}

.team-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.team-photo-wrap {
  width: 130px;
  height: 130px;
  margin: 0 auto 20px;
  border-radius: 50%;
  overflow: hidden;
  border: 4px solid #ffffff;
  box-shadow: var(--shadow-md);
}

.team-photo-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.team-name {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: 6px;
}

.team-role {
  font-size: 0.95rem;
  color: var(--color-primary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Community Section */
.community-section {
  padding: 100px 0;
  background: var(--color-bg-alt);
}

.community-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
}

.community-card {
  background: var(--color-bg-card);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
}

.community-card-img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.community-card-body {
  padding: 32px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.community-card-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: 12px;
}

.community-card-desc {
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  margin-bottom: 24px;
  flex-grow: 1;
}

/* Exhibition Gallery */
.exhibition-section {
  padding: 90px 0;
  background: #ffffff;
}

.exhibition-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.exhibition-item {
  border-radius: var(--border-radius-md);
  overflow: hidden;
  height: 220px;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  position: relative;
}

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

.exhibition-item:hover img {
  transform: scale(1.08);
}

/* Footer */
.site-footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 70px 0 30px;
  border-top: 1px solid #1e293b;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-col-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-info-text {
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 16px;
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-social-list {
  display: flex;
  gap: 12px;
  margin-top: 16px;
}

.footer-social-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #1e293b;
  color: #cbd5e1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.footer-social-icon:hover {
  background: var(--color-primary);
  color: #ffffff;
  transform: translateY(-2px);
}

.footer-payments {
  padding: 24px 0;
  border-top: 1px solid #1e293b;
  border-bottom: 1px solid #1e293b;
  margin-bottom: 24px;
  text-align: center;
}

.footer-payments img {
  max-width: 380px;
  margin: 0 auto;
  opacity: 0.85;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: #64748b;
}

/* Lightbox Modal */
.lightbox-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.92);
  backdrop-filter: blur(8px);
  z-index: 99999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.lightbox-modal.active {
  display: flex;
}

.lightbox-content {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-content img {
  max-width: 100%;
  max-height: 85vh;
  border-radius: var(--border-radius-sm);
  box-shadow: 0 20px 60px rgba(0,0,0,0.6);
}

.lightbox-close {
  position: absolute;
  top: -40px;
  right: 0;
  background: transparent;
  border: none;
  color: #fff;
  font-size: 2.2rem;
  cursor: pointer;
  line-height: 1;
}

.lightbox-nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  border: none;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.5rem;
  transition: all var(--transition-fast);
}

.lightbox-nav-btn:hover {
  background: rgba(255, 255, 255, 0.35);
}

.lightbox-prev {
  left: 20px;
}

.lightbox-next {
  right: 20px;
}

/* Floating Messenger Button */
.floating-contact-btn {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: linear-gradient(135deg, #229ed9, #1789c4);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 25px rgba(34, 158, 217, 0.5);
  z-index: 999;
  cursor: pointer;
  transition: all var(--transition-smooth);
}

.floating-contact-btn:hover {
  transform: scale(1.1) translateY(-2px);
  box-shadow: 0 14px 35px rgba(34, 158, 217, 0.7);
}

.floating-contact-btn svg {
  width: 32px;
  height: 32px;
  fill: #fff;
}

/* Form Alerts */
.form-alert {
  display: none;
  padding: 14px 18px;
  border-radius: var(--border-radius-sm);
  margin-bottom: 18px;
  font-size: 0.92rem;
  line-height: 1.4;
  text-align: center;
}

.form-alert.success {
  background: rgba(0, 168, 107, 0.15);
  border: 1px solid var(--color-accent);
  color: #86efac;
  display: block;
}

.form-alert.error {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid #ef4444;
  color: #fca5a5;
  display: block;
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.8rem;
  }
  .courses-grid {
    grid-template-columns: 1fr;
  }
  .workflow-steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .benefits-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .reviews-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .ai-cards-grid {
    grid-template-columns: 1fr;
  }
  .cases-grid {
    grid-template-columns: 1fr;
  }
  .roi-card {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .lead-grid {
    grid-template-columns: 1fr;
  }
  .free-lesson-card {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 768px) {
  .section-title {
    font-size: 1.85rem;
  }
  .header-nav {
    display: none;
    position: absolute;
    top: 76px;
    left: 0;
    width: 100%;
    background: #ffffff;
    padding: 24px;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
    border-top: 1px solid var(--color-border);
  }
  .header-nav.active {
    display: flex;
  }
  .mobile-menu-toggle {
    display: block;
  }
  .header-phone {
    display: none;
  }
  .hero-title {
    font-size: 2.2rem;
  }
  .hero-bullets {
    grid-template-columns: 1fr;
  }
  .trust-card {
    flex-direction: column;
    text-align: center;
    padding: 24px;
  }
  .trust-card-left {
    flex-direction: column;
  }
  .trust-card-stats {
    justify-content: center;
  }
  .viewer-3d-canvas-wrap {
    height: 380px;
  }
  .ba-slider-wrap {
    height: 320px;
  }
  .quiz-options-grid {
    grid-template-columns: 1fr;
  }
  .benefits-grid {
    grid-template-columns: 1fr;
  }
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .sysreq-grid {
    grid-template-columns: 1fr;
  }
  .team-grid {
    grid-template-columns: 1fr;
  }
  .community-grid {
    grid-template-columns: 1fr;
  }
  .exhibition-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .guarantee-card {
    flex-direction: column;
    text-align: center;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.85rem;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .workflow-steps-grid {
    grid-template-columns: 1fr;
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .exhibition-grid {
    grid-template-columns: 1fr;
  }
  .course-card {
    padding: 28px 20px;
  }
  .roi-card {
    padding: 28px 20px;
  }
  .quiz-card {
    padding: 24px 16px;
  }
}