:root {
  --bg-primary: #0b0e14;
  --bg-secondary: #111820;
  --bg-dark-soft: #0f141c;
  --bg-card: #1a232e;
  --text-primary: #ffffff;
  --text-secondary: #b0b8c5;
  --text-secondary-soft: #8a95a8;
  --accent: #2a9df4;
  --accent-dark: #1a7bc4;
  --accent-soft: rgba(42, 157, 244, 0.12);
  --accent-gradient: linear-gradient(135deg, #2a9df4 0%, #1a7bc4 100%);
  --border-color: rgba(255, 255, 255, 0.06);
  --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.8);
  --radius: 16px;
  --transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

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

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--accent);
  border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-dark);
}

.text-accent {
  color: var(--accent) !important;
}

.text-secondary-soft {
  color: var(--text-secondary-soft) !important;
}

.bg-accent-soft {
  background-color: var(--accent-soft) !important;
}

.bg-dark-soft {
  background-color: var(--bg-dark-soft) !important;
}

.section-padding {
  padding: 100px 0;
}

@media (max-width: 768px) {
  .section-padding {
    padding: 60px 0;
  }
}

.btn-accent {
  background: var(--accent-gradient);
  color: #fff;
  border: none;
  font-weight: 600;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(42, 157, 244, 0.35);
}

.btn-accent:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(42, 157, 244, 0.5);
  color: #fff;
}

.btn-outline-accent {
  color: var(--accent);
  border: 2px solid var(--accent);
  background: transparent;
  font-weight: 600;
  transition: var(--transition);
}

.btn-outline-accent:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(42, 157, 244, 0.3);
}

.btn-outline-light {
  border: 2px solid rgba(255, 255, 255, 0.2);
  color: var(--text-primary);
  font-weight: 600;
  transition: var(--transition);
}

.btn-outline-light:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.4);
  transform: translateY(-2px);
}

header {
  background: rgba(11, 14, 20, 0.85);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

header .navbar-brand {
  font-size: 1.5rem;
  letter-spacing: -0.5px;
}

header .navbar-brand .text-accent {
  color: var(--accent) !important;
}

header .nav-link {
  color: var(--text-secondary) !important;
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition);
  position: relative;
}

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

header .nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: var(--transition);
  border-radius: 2px;
}

header .nav-link:hover::after {
  width: 60%;
}

header .btn-accent {
  box-shadow: none;
}

header .btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(42, 157, 244, 0.4);
}

.hero-section {
  min-height: 100vh;
  padding-top: 120px;
  padding-bottom: 80px;
  position: relative;
  overflow: hidden;
  background: radial-gradient(ellipse at 70% 20%, rgba(42, 157, 244, 0.06) 0%, transparent 60%);
}

.hero-section h1 {
  line-height: 1.1;
  letter-spacing: -1px;
}

.hero-section .lead {
  font-size: 1.2rem;
  max-width: 540px;
}

.shadow-xl {
  box-shadow: var(--shadow-xl);
}

.feature-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  transition: var(--transition);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(4px);
}

.feature-card:hover {
  transform: translateY(-8px);
  border-color: rgba(42, 157, 244, 0.25);
  box-shadow: 0 20px 40px -12px rgba(0, 0, 0, 0.5);
}

.icon-circle {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  transition: var(--transition);
}

.feature-card:hover .icon-circle {
  background: var(--accent);
  color: #fff;
  transform: scale(1.05);
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.step-card:hover {
  transform: translateY(-5px);
  border-color: rgba(42, 157, 244, 0.2);
  box-shadow: 0 15px 35px -12px rgba(0, 0, 0, 0.4);
}

.step-number {
  font-size: 3rem;
  font-weight: 800;
  color: var(--accent);
  opacity: 0.2;
  line-height: 1;
  letter-spacing: -2px;
}

.step-card h5 {
  margin-top: -10px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  transition: var(--transition);
  height: 100%;
}

.testimonial-card:hover {
  border-color: rgba(42, 157, 244, 0.2);
  transform: translateY(-4px);
  box-shadow: 0 15px 35px -12px rgba(0, 0, 0, 0.4);
}

.testimonial-card .bi-quote {
  opacity: 0.5;
}

.cta-section {
  background: radial-gradient(ellipse at 50% 50%, rgba(42, 157, 244, 0.06) 0%, transparent 70%);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

#backToTop {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--accent-gradient);
  color: #fff;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: var(--transition);
  box-shadow: 0 8px 25px rgba(42, 157, 244, 0.4);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
}

#backToTop.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

#backToTop:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 12px 35px rgba(42, 157, 244, 0.5);
}

[data-animate] {
  opacity: 0;
  transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

/* Анимации по умолчанию */
[data-animate="fade-up"] {
  transform: translateY(40px);
}

[data-animate="fade-right"] {
  transform: translateX(-40px);
}

[data-animate="fade-left"] {
  transform: translateX(40px);
}

[data-animate="zoom-in"] {
  transform: scale(0.92);
}

[data-animate="slide-up"] {
  transform: translateY(60px);
}

/* Задержки анимаций */
[data-delay="100"] {
  transition-delay: 0.1s;
}

[data-delay="150"] {
  transition-delay: 0.15s;
}

[data-delay="200"] {
  transition-delay: 0.2s;
}

[data-delay="250"] {
  transition-delay: 0.25s;
}

[data-delay="300"] {
  transition-delay: 0.3s;
}

[data-delay="400"] {
  transition-delay: 0.4s;
}

[data-delay="500"] {
  transition-delay: 0.5s;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 991px) {
  .hero-section {
    min-height: auto;
    padding-top: 140px;
    padding-bottom: 60px;
  }

  .hero-section h1 {
    font-size: 2.8rem;
  }
}

@media (max-width: 768px) {
  header .navbar-brand {
    font-size: 1.25rem;
  }

  .hero-section h1 {
    font-size: 2.2rem;
  }

  .hero-section .lead {
    font-size: 1rem;
  }

  .hero-section .d-flex.gap-3 {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-section .d-flex.gap-3 .btn {
    width: 100%;
    text-align: center;
  }

  .icon-circle {
    width: 60px;
    height: 60px;
  }

  .icon-circle i {
    font-size: 1.5rem !important;
  }

  #backToTop {
    width: 44px;
    height: 44px;
    font-size: 1.1rem;
    bottom: 20px;
    right: 20px;
  }
}

@media (max-width: 576px) {
  .section-padding {
    padding: 40px 0;
  }

  .hero-section h1 {
    font-size: 1.8rem;
  }

  .display-5 {
    font-size: 1.8rem !important;
  }

  .step-number {
    font-size: 2.2rem;
  }
}