:root {
  color-scheme: light;
  --bg: #f5f7fa;
  --surface: #ffffff;
  --surface-accent: #eef2f6;
  --text: #1f2a37;
  --muted: #4b5563;
  --border: #d8dee8;
  --accent: #0b7fd6;
  --accent-dark: #075f9d;
  --shadow: 0 14px 30px rgba(15, 23, 42, 0.12);
  --radius: 14px;
  font-family: "Inter", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: inherit;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover,
a:focus {
  text-decoration: underline;
}

.container {
  width: min(960px, 92vw);
  margin: 0 auto;
  padding: 0 0 2.5rem 0;
}

.site-header {
  background: linear-gradient(140deg, #0b7fd6 0%, #124b78 65%, #0a2033 100%);
  color: #f9fbff;
  padding-bottom: 4rem;
  box-shadow: inset 0 -1px 0 rgba(255, 255, 255, 0.1);
}

.site-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 0 1rem;
  gap: 1.5rem;
}

.site-nav .brand {
  font-weight: 600;
  letter-spacing: 0.03em;
}

.site-nav ul {
  list-style: none;
  display: flex;
  gap: 1.25rem;
  margin: 0;
  padding: 0;
}

.site-nav a {
  color: #e6f1ff;
  font-size: 0.95rem;
}

.hero {
  padding: 2.5rem 0 0;
  max-width: 720px;
}

.hero h1 {
  font-size: clamp(2.2rem, 4vw, 3rem);
  margin-bottom: 1rem;
}

.tagline {
  font-size: 1.1rem;
  margin-bottom: 2rem;
  color: rgba(239, 246, 255, 0.92);
}

.cta {
  display: inline-block;
  background: #f9fbff;
  color: #0a2842;
  padding: 0.75rem 1.75rem;
  border-radius: 999px;
  font-weight: 600;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.cta:hover,
.cta:focus {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(15, 23, 42, 0.2);
}

main {
  margin: -2rem 0 0;
}

.panel {
  background: var(--surface);
  border-radius: var(--radius);
  margin: 2.25rem 0;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.panel .container {
  padding: 2.5rem;
}

.panel h2 {
  margin-top: 0;
  margin-bottom: 1.25rem;
}

.panel h3 {
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.panel p,
.panel li {
  font-size: 1.02rem;
}

.panel ul,
.panel ol {
  padding-left: 1.2rem;
}

blockquote {
  border-left: 4px solid var(--accent);
  padding-left: 1rem;
  color: var(--muted);
  margin: 1.5rem 0;
  font-style: italic;
}

code {
  background: var(--surface-accent);
  padding: 0.25rem 0.4rem;
  border-radius: 6px;
  font-family: "IBM Plex Mono", "SFMono-Regular", Menlo, monospace;
  font-size: 0.95rem;
}

.footer {
  background: #0a2033;
  color: #e9f1fb;
  padding: 2.5rem 0;
  text-align: center;
  font-size: 0.95rem;
}

.footer p {
  margin: 0.6rem 0;
  line-height: 1.5;
}

@media (max-width: 720px) {
  .site-nav {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-nav ul {
    flex-wrap: wrap;
    gap: 0.75rem 1.5rem;
  }

  .panel .container {
    padding: 1.8rem;
  }
}