:root {
  --bg: #0b0b0b;
  --panel: #121212;
  --text: #f0f0f0;
  --muted: #b5b5b5;
  --accent: #9ad1ff;
  --line: #262626;
}

/* Reset & box model */
* {
  box-sizing: border-box;
}

/* Base body */
body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background: radial-gradient(1200px 600px at 50% -10%, #151515, var(--bg));
  color: var(--text);
  line-height: 1.65;
}

/* Accessibility: skip link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: #000;
  color: #fff;
  padding: 0.6rem 1rem;
  z-index: 100;
  text-decoration: none;
}

.skip-link:focus {
  top: 0;
}

/* Layout */
main {
  max-width: 860px;
  margin: 0 auto;
  padding: 8rem 2rem 6rem;
}

header {
  margin-bottom: 4rem;
}

/* Typography */
h1 {
  font-size: clamp(2.8rem, 6vw, 4rem);
  letter-spacing: 0.08em;
  margin: 0 0 1rem;
}

h2 {
  font-size: 1.6rem;
  margin-top: 3rem;
  margin-bottom: 1rem;
  letter-spacing: 0.04em;
}

p {
  max-width: 60ch;
  color: var(--text);
}

small {
  display: block;
  margin-top: 0.25rem;
  color: var(--muted);
}

/* Sections */
section {
  margin-top: 3.5rem;
  padding-top: 3.5rem;
  border-top: 1px solid var(--line);
}

/* Links */
a {
  color: var(--accent);
  text-decoration: none;
  position: relative;
}

a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width 0.25s ease;
}

a:hover::after {
  width: 100%;
}

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* Card grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.card {
  background: linear-gradient(180deg, #141414, #0f0f0f);
  border: 1px solid var(--line);
  padding: 1.75rem;
  border-radius: 12px;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.card:hover {
  transform: translateY(-4px);
  border-color: #3a3a3a;
}

/* Footer */
.footer {
  margin-top: 6rem;
  padding-top: 3rem;
  border-top: 1px solid var(--line);
  font-size: 0.9rem;
  color: var(--muted);
}

.trust-line {
  margin-top: 1rem;
}