:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-soft: rgba(255, 255, 255, 0.82);
  --text: #14213d;
  --muted: #5b6475;
  --border: #e4e8f0;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --shadow: 0 10px 30px rgba(20, 33, 61, 0.08);
  --radius: 18px;
  --max-width: 1100px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, Arial, sans-serif;
  background:
    radial-gradient(circle at top right, rgba(37, 99, 235, 0.08), transparent 30%),
    linear-gradient(180deg, #f8fbff 0%, var(--bg) 100%);
  color: var(--text);
  line-height: 1.6;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid rgba(228, 232, 240, 0.9);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  color: var(--text);
}

.logo {
  width: 42px;
  height: 42px;
  object-fit: contain;
  border-radius: 12px;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-text strong {
  font-size: 1rem;
}

.brand-text span {
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 500;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.site-nav a {
  padding: 10px 14px;
  border-radius: 999px;
  color: var(--muted);
  font-weight: 600;
  transition: 0.2s ease;
}

.site-nav a:hover,
.site-nav a.active {
  background: rgba(37, 99, 235, 0.1);
  color: var(--primary);
}

.page-shell {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 20px 80px;
}

.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 28px;
  align-items: center;
  margin-bottom: 32px;
}

.card {
  background: var(--surface-soft);
  border: 1px solid rgba(228, 232, 240, 0.9);
  box-shadow: var(--shadow);
  border-radius: var(--radius);
  padding: 28px;
}

h1, h2, h3 {
  line-height: 1.15;
  margin-top: 0;
}

h1 {
  font-size: clamp(2.3rem, 5vw, 4rem);
  margin-bottom: 16px;
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  margin-bottom: 14px;
}

p {
  margin-top: 0;
  color: var(--muted);
}

.lead {
  font-size: 1.1rem;
  max-width: 62ch;
}

.button-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 22px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 18px;
  border-radius: 12px;
  font-weight: 700;
  transition: 0.2s ease;
  border: 1px solid transparent;
}

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

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

.button-secondary {
  background: white;
  border-color: var(--border);
  color: var(--text);
}

.button-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.feature-list {
  margin: 0;
  padding-left: 18px;
}

.feature-list li {
  margin-bottom: 10px;
  color: var(--text);
}

.section-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.highlight {
  color: var(--primary);
}

.site-footer {
  border-top: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.75);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 20px 40px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-brand {
  max-width: 420px;
}

.footer-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--muted);
  font-weight: 600;
}

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

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

.small {
  font-size: 0.92rem;
}

@media (max-width: 840px) {
  .hero,
  .section-grid,
  .header-inner {
    grid-template-columns: 1fr;
    display: grid;
  }

  .header-inner {
    gap: 16px;
  }

  .site-nav {
    justify-content: flex-start;
  }

  .page-shell {
    padding-top: 28px;
  }

  .card {
    padding: 22px;
  }
}