:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #555;
  --accent: #0a66c2;
  --accent-hover: #084a91;
  --accent-soft: #eef5fc;
  --border: #e5e5e5;
  --hover-bg: rgba(0, 0, 0, 0.04);
  --radius: 8px;
  --max-width: 680px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f0f;
    --fg: #f5f5f5;
    --muted: #a0a0a0;
    --accent-soft: #11243a;
    --border: #222;
    --hover-bg: rgba(255, 255, 255, 0.06);
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.25rem 5rem;
}

.hero {
  text-align: center;
  margin-bottom: 3.5rem;
}

.avatar {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border);
  margin-bottom: 1.5rem;
}

h1 {
  font-size: 2.25rem;
  margin: 0 0 0.75rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.35rem;
  margin: 0 0 0.75rem;
  letter-spacing: -0.01em;
}

.mission {
  font-size: 1.15rem;
  line-height: 1.45;
  margin: 0 auto 0.75rem;
  max-width: 32rem;
  color: var(--fg);
}

.tagline {
  color: var(--muted);
  margin: 0 0 1.75rem;
  font-size: 0.95rem;
}

section { margin-bottom: 3rem; }

p { margin: 0 0 1rem; }

.btn {
  display: inline-block;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius);
  text-decoration: none;
  border: 1px solid var(--border);
  color: var(--fg);
  font-weight: 500;
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}

.btn:hover { background: var(--hover-bg); }
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn-lg {
  padding: 0.9rem 1.75rem;
  font-size: 1.05rem;
}

.newsletter-cta {
  background: var(--accent-soft);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem 1.5rem;
  text-align: center;
}

.newsletter-cta h2 { margin-top: 0; }

.newsletter-cta p {
  max-width: 32rem;
  margin: 0 auto 1.5rem;
  color: var(--fg);
}

.social { text-align: center; }

.social-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}

.social-list a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border);
  color: var(--fg);
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.social-list a:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.social-list svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}