/* ====================================================
   1. ПЕРЕМЕННЫЕ (дизайн-система)
   ==================================================== */
:root {
  --bg-primary: #0A0E17;
  --bg-secondary: #121A2A;
  --bg-element: #1A2639;
  --text-primary: #E8EDF5;
  --text-secondary: #8A9BB0;
  --border-color: #2A3A4F;
  --accent-blue: #4A90D9;
  --neon-cyan: #00E5FF;
  --color-success: #2ECC71;
  --color-warning: #F1C40F;
  --color-danger: #E74C3C;
  --color-fpv: #9B59B6;
  --color-plane: #E67E22;
  --font-sans: 'Inter', 'Segoe UI', sans-serif;
  --font-display: 'Orbitron', 'Inter', sans-serif;
  --glass-bg: rgba(18, 26, 42, 0.6);
  --glass-border: rgba(0, 229, 255, 0.15);
  --shadow-glow: 0 0 30px rgba(0, 229, 255, 0.1);
}

/* ====================================================
   2. БАЗОВЫЕ СБРОСЫ И ОБЩИЕ СТИЛИ
   ==================================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
  background-image: radial-gradient(circle at 10% 20%, rgba(0, 229, 255, 0.03) 0%, transparent 50%);
}

a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color 0.3s;
}

a:hover {
  color: var(--neon-cyan);
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ====================================================
   3. АНИМАЦИИ
   ==================================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulseGlow {
  0% {
    box-shadow: 0 0 10px rgba(0, 229, 255, 0.2);
  }
  50% {
    box-shadow: 0 0 30px rgba(0, 229, 255, 0.6);
  }
  100% {
    box-shadow: 0 0 10px rgba(0, 229, 255, 0.2);
  }
}

@keyframes float {
  0% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-10px);
  }
  100% {
    transform: translateY(0px);
  }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s cubic-bezier(0.2, 0.9, 0.3, 1);
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ====================================================
   4. ШАПКА (HEADER)
   ==================================================== */
header {
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--glass-border);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 1000;
}

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

.logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 26px;
  color: var(--neon-cyan);
  letter-spacing: 2px;
}

.logo i {
  margin-right: 10px;
  color: var(--accent-blue);
}

.logo span {
  color: var(--text-secondary);
  font-weight: 300;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 32px;
  align-items: center;
}

nav a {
  color: var(--text-primary);
  font-size: 16px;
  font-weight: 500;
  text-decoration: none;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: all 0.3s;
  display: flex;
  align-items: center;
  gap: 8px;
}

nav a i {
  color: var(--accent-blue);
  font-size: 14px;
}

nav a:hover {
  color: var(--neon-cyan);
  border-bottom-color: var(--neon-cyan);
}

.hamburger {
  display: none;
  font-size: 28px;
  cursor: pointer;
  color: var(--text-primary);
}

/* ====================================================
   5. ГЕРОЙ-БЛОК
   ==================================================== */
.hero {
  padding: 100px 0 80px;
  min-height: 90vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  background: radial-gradient(ellipse at 70% 50%, #121A2A 0%, var(--bg-primary) 80%);
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 40%, rgba(0, 229, 255, 0.03) 0%, transparent 60%);
  animation: float 20s infinite alternate ease-in-out;
  pointer-events: none;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 2;
}

.hero-content {
  animation: fadeInUp 1s ease-out;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: 52px;
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 24px;
}

.hero h1 .accent {
  color: var(--neon-cyan);
  text-shadow: 0 0 30px rgba(0, 229, 255, 0.3);
}

.hero p {
  font-size: 20px;
  color: var(--text-secondary);
  max-width: 500px;
  margin-bottom: 36px;
}

.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
  animation: float 6s infinite ease-in-out;
}

.hero-image img {
  max-width: 100%;
  border-radius: 20px;
  box-shadow: var(--shadow-glow);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(4px);
  transition: transform 0.3s;
}

.hero-image img:hover {
  transform: scale(1.02);
}

/* ====================================================
   6. КНОПКИ
   ==================================================== */
.btn {
  display: inline-block;
  background: var(--bg-element);
  border: 1px solid var(--accent-blue);
  color: var(--text-primary);
  padding: 14px 36px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 16px;
  transition: all 0.3s cubic-bezier(0.2, 0.9, 0.3, 1);
  text-decoration: none;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-blue), var(--neon-cyan));
  border: none;
  color: #fff;
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.2);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 40px rgba(0, 229, 255, 0.4);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--neon-cyan);
  color: var(--neon-cyan);
}

.btn-outline:hover {
  background: rgba(0, 229, 255, 0.1);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.2);
}

/* ====================================================
   7. СЕКЦИИ И ЗАГОЛОВКИ
   ==================================================== */
section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-color);
}

section:last-child {
  border-bottom: none;
}

h2 {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: 1px;
}

h2 .highlight {
  color: var(--neon-cyan);
  text-shadow: 0 0 20px rgba(0, 229, 255, 0.2);
}

.subtitle {
  color: var(--text-secondary);
  font-size: 18px;
  max-width: 700px;
  margin-bottom: 48px;
}

/* ====================================================
   8. КАРТОЧКИ (glassmorphism)
   ==================================================== */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.card {
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  padding: 32px;
  transition: all 0.4s cubic-bezier(0.2, 0.9, 0.3, 1);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.card:hover {
  transform: translateY(-8px);
  border-color: var(--neon-cyan);
  box-shadow: 0 12px 48px rgba(0, 229, 255, 0.15);
}

.card .icon {
  font-size: 48px;
  color: var(--neon-cyan);
  margin-bottom: 20px;
  display: block;
}

.card h3 {
  font-size: 22px;
  margin-bottom: 12px;
}

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

/* ====================================================
   9. ТАБЛИЦЫ (для ТТХ)
   ==================================================== */
table {
  border-collapse: collapse;
  width: 100%;
  background: var(--bg-secondary);
  border-radius: 16px;
  overflow: hidden;
}

th {
  background: var(--bg-element);
  padding: 16px 20px;
  text-align: left;
  color: var(--neon-cyan);
  border-bottom: 1px solid var(--border-color);
}

td {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-color);
}

tr:last-child td {
  border-bottom: none;
}

/* ====================================================
   10. ВКЛАДКИ (в стиле кнопки "Подробнее")
   ==================================================== */
.tabs {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}

.tabs .tab-btn {
  padding: 14px 36px;
  font-size: 16px;
  font-weight: 600;
  border-radius: 50px;
  border: none;
  background: var(--bg-element);
  color: var(--text-primary);
  transition: all 0.3s ease;
  cursor: pointer;
  box-shadow: 0 0 10px rgba(0,0,0,0.2);
}

.tabs .tab-btn:hover {
  background: linear-gradient(135deg, var(--accent-blue), var(--neon-cyan));
  color: #fff;
  transform: translateY(-3px);
  box-shadow: 0 0 30px rgba(0, 229, 255, 0.3);
}

.tabs .tab-btn.active {
  background: linear-gradient(135deg, var(--accent-blue), var(--neon-cyan));
  color: #fff;
  box-shadow: 0 0 30px rgba(0, 229, 255, 0.4);
}

.tab-content {
  background: var(--bg-secondary);
  padding: 30px;
  border-radius: 8px;
  border-left: 4px solid var(--neon-cyan);
}

/* ====================================================
   11. ТЕХНОЛОГИИ (сетка с картинками)
   ==================================================== */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 20px;
}

.tech-item {
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--glass-border);
  transition: all 0.3s;
  background: var(--bg-secondary);
}

.tech-item img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  transition: transform 0.5s;
}

.tech-item:hover img {
  transform: scale(1.05);
}

.tech-item .caption {
  padding: 16px;
  text-align: center;
  font-weight: 500;
  color: var(--text-secondary);
}

/* ====================================================
   12. ОТЗЫВЫ
   ==================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
}

.testimonial {
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 24px;
}

.testimonial .avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  overflow: hidden;
  margin-bottom: 16px;
  border: 2px solid var(--neon-cyan);
}

.testimonial .avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.testimonial blockquote {
  font-style: italic;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.testimonial .author {
  font-weight: 600;
  color: var(--text-primary);
}

/* ====================================================
   13. КОНТАКТЫ (ФОРМА)
   ==================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 14px 18px;
  margin-bottom: 18px;
  background: var(--bg-element);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  color: var(--text-primary);
  font-family: var(--font-sans);
  transition: border 0.3s, box-shadow 0.3s;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--neon-cyan);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.05);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-info i {
  color: var(--neon-cyan);
  width: 28px;
}

/* ====================================================
   14. ПОДВАЛ (FOOTER)
   ==================================================== */
footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 40px 0 20px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
  margin-bottom: 30px;
}

.footer-grid h4 {
  color: var(--text-primary);
  margin-bottom: 12px;
  font-weight: 600;
}

.footer-grid p {
  color: var(--text-secondary);
  font-size: 14px;
}

.social-links {
  display: flex;
  gap: 16px;
}

.social-links a {
  color: var(--text-secondary);
  font-size: 22px;
  transition: color 0.3s, transform 0.3s;
}

.social-links a:hover {
  color: var(--neon-cyan);
  transform: translateY(-3px);
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 20px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 14px;
}

/* ====================================================
   15. АДАПТИВНОСТЬ (МЕДИАЗАПРОСЫ)
   ==================================================== */
@media (max-width: 992px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero h1 {
    font-size: 40px;
  }
  .hero p {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-image {
    order: -1;
  }
  .tech-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .hamburger {
    display: block;
  }
  nav ul {
    display: none;
    flex-direction: column;
    width: 100%;
    gap: 16px;
    padding: 20px 0;
  }
  nav ul.open {
    display: flex;
  }
  .hero {
    padding: 60px 0;
  }
  .hero h1 {
    font-size: 32px;
  }
  .tech-grid {
    grid-template-columns: 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .tabs .tab-btn {
    padding: 10px 20px;
    font-size: 14px;
  }
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
}