:root {
  --background: #f3fbff;
  --surface: #ffffff;
  --surface-strong: #edf8ff;
  --primary: #5bd9f0;
  --primary-dark: #0d8fab;
  --text: #102a43;
  --text-soft: #405a75;
  --shadow: 0 24px 60px rgba(16, 42, 67, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", Roboto, Arial, sans-serif;
  background: linear-gradient(180deg, #eef9ff 0%, #f8fbff 100%);
  color: var(--text);
}

a {
  color: inherit;
}

button,
.button {
  cursor: pointer;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1rem 2rem;
  border-bottom: 1px solid rgba(13, 33, 75, 0.08);
}

.brand {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand-logo {
  width: 70px;
  height: 70px;
  object-fit: cover;
  border-radius: 1.5rem;
  box-shadow: 0 18px 40px rgba(91, 217, 240, 0.25);
}

.brand-title {
  margin: 0;
  font-size: 1.6rem;
}

.brand-subtitle {
  margin: 0.35rem 0 0;
  font-size: 0.95rem;
  color: var(--text-soft);
}

.main-nav ul {
  display: flex;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
  flex-wrap: wrap;
}

.main-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.1rem;
  border-radius: 999px;
  text-decoration: none;
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--text);
  transition: background 0.2s ease, color 0.2s ease;
}

.main-nav a:hover {
  background: var(--primary);
  color: #ffffff;
}

.hero,
.section {
  max-width: 1180px;
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: 1.25fr 0.95fr;
  gap: 2rem;
  align-items: center;
  padding: 3.5rem 2rem 1.5rem;
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--primary-dark);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-text h2 {
  margin: 0;
  font-size: clamp(2.2rem, 3.2vw, 3.6rem);
  line-height: 1.04;
}

.hero-text p {
  max-width: 36rem;
  margin: 1.2rem 0 1.8rem;
  line-height: 1.75;
  color: var(--text-soft);
  font-size: 1.05rem;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 1.6rem;
  border-radius: 999px;
  border: none;
  text-decoration: none;
  font-weight: 700;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button.primary {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 18px 40px rgba(91, 217, 240, 0.28);
}

.button.secondary {
  background: #ffffff;
  color: var(--text);
  border: 1px solid rgba(13, 33, 75, 0.12);
}

.button.demo-button {
  background: #218838;
  color: #ffffff;
}

.hero-image img {
  width: 100%;
  display: block;
  border-radius: 2rem;
  box-shadow: var(--shadow);
}

.section {
  padding: 3rem 2rem;
}

.section-info {
  display: grid;
  grid-template-columns: 1.4fr 0.9fr;
  gap: 2rem;
  align-items: center;
  background: rgba(255, 255, 255, 0.85);
  border-radius: 2rem;
  box-shadow: var(--shadow);
}

.info-card {
  padding: 2rem;
}

.info-card h2 {
  margin-top: 0;
}

.info-card p {
  line-height: 1.8;
  color: var(--text-soft);
}

.info-card ul {
  margin: 1.3rem 0 0;
  padding-left: 1.2rem;
  color: var(--text-soft);
}

.info-card ul li {
  margin-bottom: 0.85rem;
  line-height: 1.7;
}

.image-card img {
  width: 100%;
  border-radius: 1.8rem;
  box-shadow: var(--shadow);
}

.section-cards h2,
.section-products h2,
.section-benefits h2 {
  margin-bottom: 1.6rem;
}

.card-grid,
.product-grid,
.benefit-grid {
  display: grid;
  gap: 1.5rem;
}

.card-grid {
  grid-template-columns: repeat(4, minmax(220px, 1fr));
}

.card {
  background: var(--surface);
  border-radius: 1.8rem;
  padding: 2rem;
  box-shadow: var(--shadow);
  text-align: center;
}

.card img {
  width: 96px;
  height: auto;
  margin-bottom: 1.1rem;
}

.card h3 {
  margin: 0 0 0.8rem;
  color: var(--text);
}

.card p {
  margin: 0;
  color: var(--text-soft);
  line-height: 1.7;
}

.section-products {
  padding-top: 1rem;
}

.product-grid {
  grid-template-columns: repeat(2, minmax(260px, 1fr));
}

.product-card {
  background: var(--surface);
  border-radius: 2rem;
  padding: 2rem;
  box-shadow: var(--shadow);
  text-align: center;
}

.product-card img {
  display: block;
  width: 100%;
  max-width: 320px;
  border-radius: 1.8rem;
  margin-bottom: 1.4rem;
}

.product-card h3 {
  margin-bottom: 0.8rem;
}

.product-card p {
  margin-bottom: 1.5rem;
  color: var(--text-soft);
  line-height: 1.75;
}

.product-card .download-notice {
  margin: 1rem 0 0;
  font-size: 0.9rem;
}

.section-benefits {
  background: rgba(255, 255, 255, 0.88);
  border-radius: 2rem;
}

.benefit-grid {
  grid-template-columns: repeat(3, minmax(220px, 1fr));
}

.benefit-card {
  background: #eff9ff;
  border-radius: 1.8rem;
  padding: 2rem;
  box-shadow: 0 20px 40px rgba(91, 217, 240, 0.15);
}

.benefit-card h3 {
  margin-top: 0;
  margin-bottom: 1rem;
}

.benefit-card p {
  margin: 0;
  line-height: 1.75;
  color: var(--text-soft);
}

.site-footer {
  padding: 2rem 2rem 3rem;
  background: linear-gradient(180deg, rgba(13, 33, 75, 0.95), rgba(13, 33, 75, 0.9));
  color: #ffffff;
  text-align: center;
}

.payment-result {
  margin-top: 3rem;
  margin-bottom: 3rem;
  border-radius: 2rem;
  background: var(--surface);
  box-shadow: var(--shadow);
  text-align: center;
}

.payment-result p {
  color: var(--text-soft);
  line-height: 1.75;
}

.footer-content p {
  margin: 0.55rem 0;
  color: rgba(255, 255, 255, 0.82);
}

@media (max-width: 980px) {
  .hero,
  .section-info,
  .product-grid,
  .card-grid,
  .benefit-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 2.5rem;
  }

  .main-nav ul {
    justify-content: flex-start;
  }
}

@media (max-width: 680px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .main-nav ul {
    width: 100%;
    flex-direction: column;
    gap: 0.75rem;
  }

  .hero {
    padding: 1.8rem 1rem;
  }

  .section {
    padding: 2rem 1rem;
  }

  .hero-text h2 {
    font-size: 2rem;
  }

  .button {
    width: 100%;
  }
}