:root {
  color-scheme: light;
  --background: #ffffff;
  --foreground: #0b0f19;
  --muted: #4b5563;
  --card: #f6f7f9;
  --border: #e5e7eb;
  --link: #0a58ca;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Arial,
    "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.6;
  background: var(--background);
  color: var(--foreground);
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 16px 64px;
}

header {
  padding: 16px 0 8px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
}

header h1 {
  margin: 0 0 4px 0;
  font-size: 1.6rem;
}

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

nav {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

nav a {
  display: inline-block;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card);
  color: var(--foreground);
  text-decoration: none;
}

nav a:hover {
  border-color: #cbd5e1;
}

h2 {
  margin-top: 32px;
  margin-bottom: 10px;
  font-size: 1.25rem;
}

h3 {
  margin-top: 22px;
  margin-bottom: 8px;
  font-size: 1.05rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
}

ul,
ol {
  padding-left: 20px;
}

li {
  margin: 6px 0;
}

a {
  color: var(--link);
}

footer {
  margin-top: 40px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.95rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}