:root {
  color-scheme: light dark;
  --background: #f6f7fb;
  --foreground: #111218;
  --muted: #5c6070;
  --card: #ffffff;
  --border: #e1e4ef;
  --primary: #1463ff;
  --primary-dark: #0f4ed1;
  --hero-gradient: linear-gradient(135deg, #f0f4ff 0%, #e9eefc 55%, #f8f9ff 100%);
  --focus: #3f7cff;
  --radius: 20px;
  --shadow: 0 12px 28px rgba(17, 18, 24, 0.08);
  --max-width: 1120px;
  --section-gap: 72px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #0f111a;
    --foreground: #f4f5f9;
    --muted: #b8bccd;
    --card: #161a27;
    --border: #262b3d;
    --primary: #6c9bff;
    --primary-dark: #7aa5ff;
    --hero-gradient: linear-gradient(135deg, #0e1326 0%, #121a33 55%, #0f111a 100%);
    --shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background: var(--background);
  color: var(--foreground);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.skip-link {
  position: absolute;
  left: -999px;
  top: 16px;
  padding: 10px 18px;
  background: var(--primary);
  color: #ffffff;
  border-radius: 999px;
  font-weight: 600;
  z-index: 10;
}

.skip-link:focus {
  left: 16px;
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

header {
  position: sticky;
  top: 0;
  background: rgba(246, 247, 251, 0.92);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
  z-index: 5;
}

@media (prefers-color-scheme: dark) {
  header {
    background: rgba(15, 17, 26, 0.9);
  }
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  letter-spacing: 0.3px;
}

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: var(--primary);
  display: grid;
  place-items: center;
  color: #ffffff;
  font-weight: 700;
  font-size: 18px;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 20px;
  padding: 0;
  margin: 0;
}

nav a {
  color: var(--muted);
  font-weight: 600;
}

nav a:focus-visible,
nav a:hover {
  color: var(--foreground);
}

.hero {
  padding: 80px 0 48px;
  background: var(--hero-gradient);
}

.hero-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 32px;
  align-items: center;
}

.hero-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.hero-card p {
  color: var(--muted);
}

.hero-title {
  font-size: clamp(2rem, 2vw + 1.6rem, 3.4rem);
  line-height: 1.1;
  margin-bottom: 16px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  border: 1px solid transparent;
  min-height: 44px;
  min-width: 44px;
}

.button-primary {
  background: var(--primary);
  color: #ffffff;
}

.button-primary:hover,
.button-primary:focus-visible {
  background: var(--primary-dark);
}

.button-secondary {
  border-color: var(--border);
  background: transparent;
  color: var(--foreground);
}

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

.section-title {
  font-size: clamp(1.6rem, 1vw + 1.2rem, 2.4rem);
  margin-bottom: 12px;
}

.section-lead {
  color: var(--muted);
  max-width: 720px;
}

.card-grid {
  display: grid;
  gap: 20px;
  margin-top: 28px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.card {
  background: var(--card);
  border-radius: 18px;
  padding: 24px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.card h3 {
  margin-top: 0;
}

.steps {
  display: grid;
  gap: 20px;
  margin-top: 32px;
}

.step {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  align-items: start;
  background: var(--card);
  border-radius: 18px;
  padding: 20px;
  border: 1px solid var(--border);
}

.step-number {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: rgba(20, 99, 255, 0.15);
  display: grid;
  place-items: center;
  font-weight: 700;
  color: var(--primary);
}

.platform {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.platform-card {
  padding: 24px;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: var(--card);
  box-shadow: var(--shadow);
}

.cta {
  background: var(--card);
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  display: grid;
  gap: 16px;
}

.cta small {
  color: var(--muted);
}

.footer {
  padding: 32px 0 48px;
  border-top: 1px solid var(--border);
  color: var(--muted);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.footer-links a {
  color: var(--muted);
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--foreground);
}

.page-hero {
  padding: 64px 0 32px;
}

.page-hero p {
  color: var(--muted);
  max-width: 720px;
}

.page-content {
  padding-bottom: 80px;
}

.page-content ul {
  padding-left: 18px;
}

@media (max-width: 720px) {
  nav ul {
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  .hero {
    padding-top: 64px;
  }

  .hero-card {
    padding: 24px;
  }
}