/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-primary: #0088cc;
  --color-primary-dark: #006699;
  --color-primary-light: #33a3d9;
  --color-success: #34c759;
  --color-warning: #ff9500;
  --color-danger: #f44336;
  --color-text: #1d1d1f;
  --color-text-secondary: #6e6e73;
  --color-background: #ffffff;
  --color-background-secondary: #f5f5f7;
  --color-border: #d2d2d7;
  --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --transition: all 0.3s ease;
}

body {
  font-family: var(--font-primary);
  color: var(--color-text);
  line-height: 1.6;
  background: var(--color-background);
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header & Navigation */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  z-index: 1000;
  transition: var(--transition);
}

.header.scrolled {
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 24px;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.logo-text {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.nav-menu a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

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

.nav-menu a::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width 0.3s ease;
}

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

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

.mobile-menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: var(--transition);
}

.mobile-menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

.mobile-menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  border-radius: 12px;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 136, 204, 0.3);
}

.btn-secondary {
  background: var(--color-background-secondary);
  color: var(--color-text);
}

.btn-secondary:hover {
  background: var(--color-border);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: white;
  transform: translateY(-2px);
}

.btn-large {
  padding: 16px 40px;
  font-size: 18px;
}

/* Hero Section */
.hero {
  padding: 140px 0 80px;
  background: linear-gradient(180deg, #f5f9fc 0%, #ffffff 100%);
}

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

.hero-badge {
  display: inline-block;
  padding: 8px 16px;
  background: rgba(0, 136, 204, 0.1);
  color: var(--color-primary);
  border-radius: 24px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 56px;
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 24px;
  color: var(--color-text);
}

.highlight {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 20px;
  color: var(--color-text-secondary);
  margin-bottom: 40px;
  line-height: 1.6;
}

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

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

.feature-item {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--color-text-secondary);
  font-size: 16px;
}

/* Hero Device Preview */
.device-preview {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.device-screen {
  width: 100%;
  max-width: 360px;
  background: white;
  border-radius: 24px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
  padding: 20px;
}

.telegram-chat {
  background: var(--color-background);
  border-radius: 16px;
  overflow: hidden;
}

.chat-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  background: var(--color-primary);
  color: white;
}

.chat-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
}

.chat-name {
  font-weight: 600;
  font-size: 16px;
}

.chat-status {
  font-size: 14px;
  opacity: 0.8;
}

.chat-messages {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.message {
  display: flex;
}

.message.received {
  justify-content: flex-start;
}

.message.sent {
  justify-content: flex-end;
}

.message-bubble {
  padding: 12px 16px;
  border-radius: 16px;
  max-width: 70%;
  font-size: 15px;
}

.message.received .message-bubble {
  background: var(--color-background-secondary);
  border-bottom-left-radius: 4px;
}

.message.sent .message-bubble {
  background: var(--color-primary);
  color: white;
  border-bottom-right-radius: 4px;
}

.connection-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  background: rgba(52, 199, 89, 0.1);
  border-radius: 24px;
  color: var(--color-success);
  font-weight: 600;
  font-size: 14px;
}

.connection-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-success);
  animation: pulse 2s infinite;
}

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

/* Sections */
section {
  padding: 80px 0;
}

.section-title {
  font-size: 48px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
  color: var(--color-text);
}

.section-subtitle {
  font-size: 20px;
  text-align: center;
  color: var(--color-text-secondary);
  margin-bottom: 60px;
}

/* Advantages Section */
.advantages {
  background: var(--color-background);
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.advantage-card {
  padding: 32px;
  background: var(--color-background-secondary);
  border-radius: 20px;
  transition: var(--transition);
}

.advantage-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

.advantage-icon {
  margin-bottom: 24px;
}

.advantage-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-text);
}

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

/* How To Section */
.how-to {
  background: var(--color-background-secondary);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.step-card {
  display: flex;
  gap: 24px;
  padding: 32px;
  background: white;
  border-radius: 20px;
}

.step-number {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: white;
  font-size: 28px;
  font-weight: 700;
  border-radius: 16px;
}

.step-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-text);
}

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

/* Special Offer Section */
.special-offer {
  padding: 0;
  margin: 80px 0;
}

.offer-card {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 60px;
  align-items: center;
  padding: 60px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  border-radius: 32px;
  color: white;
}

.offer-badge {
  display: inline-block;
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 24px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 24px;
}

.offer-title {
  font-size: 40px;
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.2;
}

.offer-text {
  font-size: 18px;
  margin-bottom: 32px;
  opacity: 0.9;
}

.offer-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}

.offer-feature {
  font-size: 16px;
  font-weight: 500;
}

.offer-card .btn-primary {
  background: white;
  color: var(--color-primary);
}

.offer-card .btn-primary:hover {
  background: var(--color-background-secondary);
  transform: translateY(-2px);
}

.offer-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.price-badge {
  background: white;
  padding: 40px;
  border-radius: 24px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}

.price-old {
  font-size: 24px;
  color: var(--color-text-secondary);
  text-decoration: line-through;
  margin-bottom: 8px;
}

.price-new {
  font-size: 64px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
}

.price-period {
  font-size: 18px;
  color: var(--color-text-secondary);
  margin-top: 8px;
}

/* Pricing Section */
.pricing {
  background: var(--color-background-secondary);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.pricing-card {
  position: relative;
  padding: 40px;
  background: white;
  border-radius: 24px;
  border: 2px solid transparent;
  transition: var(--transition);
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

.pricing-card.featured {
  border-color: var(--color-primary);
  background: linear-gradient(180deg, rgba(0, 136, 204, 0.05) 0%, white 40%);
}

.pricing-badge {
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 16px;
  background: var(--color-primary);
  color: white;
  border-radius: 24px;
  font-size: 14px;
  font-weight: 600;
}

.pricing-header {
  margin-bottom: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-border);
}

.pricing-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-text);
}

.pricing-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.price-amount {
  font-size: 48px;
  font-weight: 700;
  color: var(--color-text);
}

.price-period {
  font-size: 18px;
  color: var(--color-text-secondary);
}

.pricing-total {
  font-size: 16px;
  color: var(--color-text-secondary);
  margin-top: 8px;
}

.pricing-discount {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(52, 199, 89, 0.1);
  color: var(--color-success);
  border-radius: 12px;
  font-size: 14px;
  font-weight: 600;
  margin-top: 12px;
}

.pricing-features {
  list-style: none;
  margin-bottom: 32px;
}

.pricing-features li {
  padding: 12px 0;
  font-size: 16px;
  color: var(--color-text);
}

.pricing-card .btn {
  width: 100%;
}

/* Devices Section */
.devices-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.device-card {
  padding: 32px 24px;
  background: var(--color-background-secondary);
  border-radius: 20px;
  text-align: center;
  transition: var(--transition);
}

.device-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

.device-icon {
  margin-bottom: 20px;
}

.device-name {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text);
}

.device-text {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

.device-card .btn {
  width: 100%;
}

/* FAQ Section */
.faq {
  background: var(--color-background-secondary);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: white;
  border-radius: 16px;
  margin-bottom: 16px;
  overflow: hidden;
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 32px;
  background: none;
  border: none;
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
}

.faq-question:hover {
  color: var(--color-primary);
}

.faq-icon {
  flex-shrink: 0;
  transition: transform 0.3s ease;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

.faq-answer p {
  padding: 0 32px 24px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-secondary);
}

/* Footer */
.footer {
  padding: 60px 0 32px;
  background: var(--color-text);
  color: white;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer .logo {
  color: white;
}

.footer-text {
  margin-top: 12px;
  opacity: 0.7;
  font-size: 14px;
}

.footer-bottom {
  text-align: center;
  opacity: 0.5;
  font-size: 14px;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 44px;
  }

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

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

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }

  .nav-menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: white;
    padding: 24px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    transform: translateY(-120%);
    transition: transform 0.3s ease;
  }

  .nav-menu.active {
    transform: translateY(0);
  }

  .nav-menu .btn {
    width: 100%;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .hero {
    padding: 120px 0 60px;
  }

  .hero-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-title {
    font-size: 36px;
  }

  .hero-subtitle {
    font-size: 18px;
  }

  .section-title {
    font-size: 36px;
  }

  .advantages-grid,
  .steps-grid,
  .pricing-grid,
  .devices-grid {
    grid-template-columns: 1fr;
  }

  .offer-card {
    grid-template-columns: 1fr;
    padding: 40px 24px;
    text-align: center;
  }

  .offer-features {
    grid-template-columns: 1fr;
  }

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

  .footer-content {
    flex-direction: column;
    gap: 24px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 28px;
  }

  .section-title {
    font-size: 28px;
  }

  .btn-large {
    padding: 14px 28px;
    font-size: 16px;
  }
}