:root {
  --bg: #0d0f14;
  --surface: #151922;
  --text: #f2f4f8;
  --muted: #9aa3b2;
  --accent: #7c5cff;
  --accent-dim: #5b45c4;
  --border: rgba(255, 255, 255, 0.08);
  --max: 720px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, Cantarell, "Noto Sans", sans-serif;
  background: radial-gradient(1200px 600px at 20% -10%, rgba(124, 92, 255, 0.18), transparent 55%), var(--bg);
  color: var(--text);
  line-height: 1.55;
  font-size: 1rem;
}

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

a:hover {
  text-decoration: underline;
  color: #9b87ff;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
  background: rgba(13, 15, 20, 0.85);
  border-bottom: 1px solid var(--border);
}

.site-header__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text);
}

.brand span {
  color: var(--accent);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.9rem;
}

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

.nav a[aria-current="page"] {
  color: var(--text);
  font-weight: 600;
}

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.75rem 1.25rem 3rem;
}

h1 {
  font-size: 1.65rem;
  font-weight: 700;
  margin: 0 0 0.35rem;
  line-height: 1.2;
}

.sub {
  color: var(--muted);
  font-size: 0.95rem;
  margin: 0 0 1.5rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.25rem 1.35rem;
  margin-bottom: 1.25rem;
}

.card h2 {
  font-size: 1.05rem;
  margin: 1.25rem 0 0.5rem;
  color: var(--text);
}

.card h2:first-child {
  margin-top: 0;
}

.card p,
.card li {
  margin: 0.5rem 0;
  color: var(--muted);
}

.card strong {
  color: var(--text);
}

.card ol,
.card ul {
  margin: 0.5rem 0 0.5rem 1.25rem;
  padding: 0;
}

.card ol li,
.card ul li {
  margin: 0.35rem 0;
}

.mail {
  display: inline-block;
  margin-top: 0.35rem;
  padding: 0.5rem 0.85rem;
  background: rgba(124, 92, 255, 0.15);
  border: 1px solid rgba(124, 92, 255, 0.35);
  border-radius: 10px;
  color: var(--text);
  font-weight: 600;
  word-break: break-all;
}

.mail:hover {
  background: rgba(124, 92, 255, 0.25);
  text-decoration: none;
}

footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem 2rem;
  font-size: 0.85rem;
  color: var(--muted);
  text-align: center;
}

@media (min-width: 768px) {
  body {
    font-size: 1.05rem;
  }

  h1 {
    font-size: 1.85rem;
  }
}