/* =========================================
   1. VARIABLES
   ========================================= */
:root {
  /* Colors */
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-tertiary: #1a1a25;
  --accent-primary: #6366f1;
  --accent-secondary: #8b5cf6;
  --accent-cyan: #06b6d4;
  --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6, #06b6d4);
  --text-primary: #ffffff;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --glow-primary: rgba(99, 102, 241, 0.4);
  --glow-secondary: rgba(139, 92, 246, 0.3);
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  
  /* Spacing & Layout */
  --container-width: 1280px;
  --section-padding: 100px;
  --border-radius-sm: 8px;
  --border-radius-md: 12px;
  --border-radius-lg: 16px;
  --border-radius-xl: 24px;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Typography */
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

/* =========================================
   2. RESET & BASE
   ========================================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

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

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

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

ul, ol {
  list-style: none;
}

button, input, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background: none;
  border: none;
  outline: none;
}

::selection {
  background: var(--accent-primary);
  color: var(--text-primary);
}

/* =========================================
   3. LAYOUT & UTILITIES
   ========================================= */
.container {
  width: min(100% - 40px, var(--container-width));
  margin: 0 auto;
}

.section {
  padding: var(--section-padding) 0;
  position: relative;
}

.section__title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  margin-bottom: 16px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
}

.section__subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  margin-bottom: 48px;
  max-width: 600px;
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* =========================================
   4. BUTTONS
   ========================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--border-radius-md);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn--primary {
  background: var(--accent-gradient);
  color: var(--text-primary);
  box-shadow: 0 4px 20px var(--glow-primary);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--glow-primary);
}

.btn--secondary {
  background: transparent;
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  backdrop-filter: blur(10px);
}

.btn--secondary:hover {
  background: var(--glass-bg);
  border-color: var(--accent-primary);
  box-shadow: 0 0 20px var(--glow-primary);
}

.btn--accent {
  background: linear-gradient(135deg, #06b6d4, #3b82f6);
  color: var(--text-primary);
  box-shadow: 0 4px 20px rgba(6, 182, 212, 0.4);
}

.btn--accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(6, 182, 212, 0.5);
}

.btn--small { padding: 10px 20px; font-size: 0.9rem; }
.btn--large { padding: 16px 32px; font-size: 1.1rem; }
.btn--full { width: 100%; }

.btn__icon {
  transition: transform 0.3s ease;
}

.btn:hover .btn__icon {
  transform: translateX(4px);
}

/* =========================================
   5. HEADER & NAV
   ========================================= */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 20px 0;
  transition: var(--transition-base);
}

.header.scrolled {
  padding: 12px 0;
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--glass-border);
}

.header__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.header__nav {
  display: flex;
  gap: 32px;
}

.header__link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
}

.header__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  transition: width 0.3s ease;
}

.header__link:hover,
.header__link.active {
  color: var(--text-primary);
}

.header__link:hover::after,
.header__link.active::after {
  width: 100%;
}

.header__burger {
  display: none;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}

.header__burger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition-base);
}

.header__burger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.header__burger.active span:nth-child(2) { opacity: 0; }
.header__burger.active span:nth-child(3) { transform: rotate(-45deg) translate(6px, -6px); }

/* =========================================
   6. MOBILE MENU
   ========================================= */
.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-primary);
  z-index: 999;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 24px;
  transform: translateX(100%);
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.mobile-menu.active {
  transform: translateX(0);
}

.mobile-menu__nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.mobile-menu__link {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.mobile-menu__link:hover {
  color: var(--text-primary);
}

.mobile-menu__cta {
  margin-top: 20px;
  max-width: 300px;
}

/* =========================================
   7. HERO
   ========================================= */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.hero__bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -2;
}

.hero__overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at center, transparent 0%, var(--bg-primary) 70%);
  z-index: -1;
  pointer-events: none;
}

.hero__container {
  position: relative;
  z-index: 2;
}

.hero__content {
  max-width: 800px;
}

.hero__greeting {
  font-size: 1.25rem;
  color: var(--accent-cyan);
  margin-bottom: 12px;
  font-weight: 500;
}

.hero__title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 20px;
  letter-spacing: -1px;
}

.hero__subtitle {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.hero__dot {
  color: var(--accent-primary);
}

.hero__description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero__buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 40px;
}

.hero__scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.85rem;
  animation: bounce 2s infinite;
}

.hero__scroll-line {
  width: 2px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent-primary), transparent);
  border-radius: 2px;
}

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

/* =========================================
   8. ABOUT
   ========================================= */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 48px;
  margin-bottom: 60px;
  align-items: center;
}

.about__image-wrapper {
  position: relative;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  aspect-ratio: 4/5;
  box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

.about__image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about__image-glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 30%, var(--glow-primary), transparent 60%);
  opacity: 0.5;
  pointer-events: none;
}

.about__text {
  color: var(--text-secondary);
  margin-bottom: 16px;
  font-size: 1.05rem;
}

.about__text--lead {
  font-size: 1.2rem;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.about__contacts {
  display: flex;
  gap: 20px;
  margin-top: 24px;
}

.about__contact {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  font-weight: 500;
}

.about__contact:hover {
  color: var(--accent-primary);
}

.about__counters {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius-lg);
  padding: 32px;
  text-align: center;
}

.counter {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.counter__number {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1;
}

.counter__plus {
  font-size: 1.5rem;
  color: var(--accent-primary);
  margin-left: 2px;
}

.counter__label {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 8px;
}

/* =========================================
   9. SERVICES
   ========================================= */
.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.service-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius-lg);
  padding: 28px;
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), var(--glow-primary), transparent 60%);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.service-card:hover::before {
  opacity: 0.3;
}

.service-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-5px);
}

.service-card--wide {
  grid-column: span 2;
}

.service-card__icon {
  width: 56px;
  height: 56px;
  background: var(--bg-tertiary);
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--accent-primary);
  transition: var(--transition-base);
}

.service-card:hover .service-card__icon {
  background: var(--accent-primary);
  color: var(--text-primary);
  box-shadow: 0 8px 20px var(--glow-primary);
}

.service-card__title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.service-card__text {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* =========================================
   10. ADVANTAGES
   ========================================= */
.advantages__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.advantage {
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius-lg);
  padding: 24px;
  transition: var(--transition-base);
}

.advantage:hover {
  border-color: var(--accent-secondary);
  transform: translateY(-3px);
}

.advantage__icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(6, 182, 212, 0.2));
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--accent-cyan);
}

.advantage__title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.advantage__text {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* =========================================
   11. PROCESS
   ========================================= */
.process__timeline {
  position: relative;
  padding-left: 40px;
}

.process__timeline::before {
  content: '';
  position: absolute;
  left: 19px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-primary), transparent);
}

.process__step {
  position: relative;
  margin-bottom: 40px;
}

.process__step:last-child {
  margin-bottom: 0;
}

.process__number {
  position: absolute;
  left: -40px;
  top: 0;
  width: 40px;
  height: 40px;
  background: var(--bg-secondary);
  border: 2px solid var(--accent-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--accent-primary);
  z-index: 2;
}

.process__content {
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius-lg);
  padding: 24px;
  transition: var(--transition-base);
}

.process__content:hover {
  border-color: var(--accent-cyan);
  box-shadow: 0 10px 30px rgba(6, 182, 212, 0.15);
}

.process__title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.process__text {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* =========================================
   12. FAQ
   ========================================= */
.faq__list {
  max-width: 800px;
  margin: 0 auto;
}

.faq__item {
  border-bottom: 1px solid var(--glass-border);
  margin-bottom: 12px;
}

.faq__item:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

.faq__question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  font-size: 1.1rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  color: var(--text-primary);
  transition: var(--transition-base);
}

.faq__question:hover {
  color: var(--accent-primary);
}

.faq__icon {
  transition: transform 0.3s ease;
  flex-shrink: 0;
  margin-left: 16px;
}

.faq__item.active .faq__icon {
  transform: rotate(180deg);
}

.faq__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
}

.faq__item.active .faq__answer {
  max-height: 200px;
  padding-bottom: 20px;
}

.faq__answer p {
  color: var(--text-secondary);
  line-height: 1.7;
}

/* =========================================
   13. CONTACT
   ========================================= */
.contact__grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
}

.contact__form {
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius-lg);
  padding: 32px;
}

.form__group {
  position: relative;
  margin-bottom: 24px;
}

.form__input {
  width: 100%;
  padding: 16px;
  background: var(--bg-tertiary);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  transition: var(--transition-base);
}

.form__input::placeholder {
  color: var(--text-muted);
}

.form__input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.form__textarea {
  min-height: 120px;
  resize: vertical;
}

.form__note {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 16px;
}

.contact__info {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact__card {
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius-lg);
  padding: 24px;
}

.contact__card-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.contact__item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--glass-border);
}

.contact__item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.contact__item-icon {
  width: 44px;
  height: 44px;
  background: var(--bg-tertiary);
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-primary);
  flex-shrink: 0;
}

.contact__item-content {
  display: flex;
  flex-direction: column;
}

.contact__item-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.contact__item-value {
  font-weight: 600;
  color: var(--text-primary);
}

.contact__item:hover .contact__item-icon {
  background: var(--accent-primary);
  color: var(--text-primary);
}

/* =========================================
   14. FOOTER
   ========================================= */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--glass-border);
  padding: 60px 0 24px;
}

.footer__container {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer__logo {
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
  margin-bottom: 12px;
}

.footer__tagline {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.footer__nav {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer__link {
  color: var(--text-secondary);
  font-weight: 500;
}

.footer__link:hover {
  color: var(--accent-primary);
}

.footer__contacts {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer__contact {
  color: var(--text-secondary);
  font-weight: 500;
}

.footer__contact:hover {
  color: var(--accent-cyan);
}

.footer__bottom {
  border-top: 1px solid var(--glass-border);
  padding-top: 24px;
}

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

.footer__copyright {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer__back-to-top {
  width: 40px;
  height: 40px;
  background: var(--bg-tertiary);
  border: 1px solid var(--glass-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: var(--transition-base);
}

.footer__back-to-top:hover {
  background: var(--accent-primary);
  color: var(--text-primary);
  border-color: var(--accent-primary);
  transform: translateY(-3px);
}

/* =========================================
   15. ANIMATIONS & EFFECTS
   ========================================= */
@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 20px var(--glow-primary); }
  50% { box-shadow: 0 0 40px var(--glow-primary); }
}

.glow-pulse {
  animation: pulse-glow 3s infinite;
}

/* =========================================
   16. RESPONSIVE
   ========================================= */
@media (max-width: 992px) {
  :root {
    --section-padding: 80px;
  }
  
  .header__nav, .header__cta {
    display: none;
  }
  
  .header__burger {
    display: flex;
  }
  
  .about__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .about__image-wrapper {
    max-width: 400px;
    margin: 0 auto;
  }
  
  .services__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .service-card--wide {
    grid-column: span 2;
  }
  
  .advantages__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .contact__grid {
    grid-template-columns: 1fr;
  }
  
  .footer__container {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 60px;
  }
  
  .hero {
    min-height: auto;
    padding: 120px 0 80px;
  }
  
  .hero__scroll {
    display: none;
  }
  
  .about__counters {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    padding: 24px;
  }
  
  .services__grid {
    grid-template-columns: 1fr;
  }
  
  .service-card--wide {
    grid-column: span 1;
  }
  
  .advantages__grid {
    grid-template-columns: 1fr;
  }
  
  .process__timeline {
    padding-left: 0;
  }
  
  .process__timeline::before {
    display: none;
  }
  
  .process__number {
    position: relative;
    left: auto;
    margin-bottom: 12px;
  }
  
  .footer__container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer__bottom-container {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    width: min(100% - 24px, var(--container-width));
  }
  
  .section__title {
    font-size: 2rem;
  }
  
  .hero__buttons {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
  }
  
  .about__contacts {
    flex-direction: column;
    gap: 12px;
  }
  
  .contact__form {
    padding: 24px;
  }
}