:root {
  color-scheme: dark;
  --bg: #0f1014;
  --panel: rgba(24, 24, 29, 0.92);
  --panel-2: rgba(31, 33, 41, 0.92);
  --border: rgba(255, 255, 255, 0.08);
  --text: #f5f7fb;
  --muted: #a7adbb;
  --accent: #8fa2ff;
  --accent-2: #ffd36d;
  --danger: #ff9c6b;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top, rgba(99, 102, 241, 0.18), transparent 36%),
    radial-gradient(circle at bottom right, rgba(59, 130, 246, 0.1), transparent 28%),
    var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
  padding: 32px 18px 72px;
}

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

a:hover {
  text-decoration: underline;
}

.wrap {
  width: min(1120px, 100%);
  margin: 0 auto;
}

.hero {
  margin-bottom: 22px;
  padding: 20px 22px;
  border: 1px solid var(--border);
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(20, 20, 25, 0.96), rgba(15, 16, 20, 0.92));
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.28);
}

.eyebrow {
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.24em;
  color: var(--muted);
  margin-bottom: 10px;
}

h1 {
  margin: 0 0 10px;
  font-size: clamp(28px, 5vw, 44px);
  line-height: 1.05;
  text-transform: uppercase;
  letter-spacing: -0.03em;
}

.lead {
  max-width: 860px;
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
}

.notice {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: 18px;
  border: 1px solid rgba(255, 211, 109, 0.28);
  background: rgba(255, 211, 109, 0.08);
  color: #ffecb8;
  font-size: 14px;
  line-height: 1.65;
}

.grid {
  display: grid;
  grid-template-columns: minmax(0, 260px) minmax(0, 1fr);
  gap: 20px;
}

.sidebar,
.content,
.card {
  border: 1px solid var(--border);
  border-radius: 24px;
  background: var(--panel);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.18);
}

.sidebar {
  padding: 18px;
  position: sticky;
  top: 24px;
  align-self: start;
}

.sidebar h2 {
  margin: 0 0 12px;
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.nav {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.nav a {
  display: block;
  padding: 12px 14px;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(255, 255, 255, 0.02);
  color: var(--text);
  font-weight: 700;
}

.nav a.active,
.nav a:hover {
  border-color: rgba(143, 162, 255, 0.28);
  background: rgba(143, 162, 255, 0.09);
  text-decoration: none;
}

.content {
  padding: 24px;
}

.content h2 {
  margin: 26px 0 10px;
  font-size: 20px;
}

.content h3 {
  margin: 18px 0 8px;
  font-size: 16px;
}

.content p,
.content li {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}

.content ul {
  padding-left: 20px;
}

.content code {
  padding: 2px 6px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
  color: #f8fbff;
}

.placeholder {
  display: inline-block;
  margin-top: 8px;
  padding: 3px 8px;
  border-radius: 999px;
  background: rgba(255, 156, 107, 0.12);
  border: 1px solid rgba(255, 156, 107, 0.28);
  color: #ffd0b9;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.meta {
  margin-top: 28px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 12px;
  color: var(--muted);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.card {
  padding: 18px;
  background: var(--panel-2);
}

.card h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.card p {
  margin: 0 0 14px;
}

.list-plain {
  margin: 0;
  padding-left: 18px;
}

.footer {
  margin-top: 22px;
  color: var(--muted);
  font-size: 12px;
}

@media (max-width: 860px) {
  body {
    padding: 18px 12px 52px;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }
}