:root {
  --bg: #0b0c10;
  --card: #11131a;
  --text: #e8ecf1;
  --muted: #a9b4c0;
  --accent: #6ee7ff;
  --accent-strong: #22d3ee;
  --border: #1f2430;
  --link: #7dd3fc;
  --link-visited: #bae6fd;
  --maxw: 860px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: radial-gradient(1200px 600px at 80% -10%, rgba(34, 211, 238, 0.12), transparent 60%),
              radial-gradient(900px 500px at -10% 20%, rgba(125, 211, 252, 0.10), transparent 65%),
              var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.65;
}

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

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

a:hover { color: var(--accent); }

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 40px 20px 80px;
}

header {
  margin-bottom: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0.2px;
}

.brand-badge {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  box-shadow: 0 10px 30px rgba(34, 211, 238, 0.35);
}

nav {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

nav a {
  text-decoration: none;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.02);
  color: var(--text);
}

nav a:hover {
  border-color: rgba(110, 231, 255, 0.6);
  color: var(--accent);
}

.hero {
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.015));
  margin: 18px 0 26px;
}

.hero h1 {
  margin: 0 0 8px;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.15;
}

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

.card {
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--card);
  margin: 18px 0;
}

h1, h2, h3 {
  line-height: 1.25;
  margin-top: 28px;
  margin-bottom: 10px;
}

h1 { font-size: clamp(30px, 4.5vw, 42px); margin-top: 6px; }

h2 { font-size: clamp(22px, 3vw, 28px); }

h3 { font-size: clamp(18px, 2.2vw, 22px); }

p { margin: 10px 0; }

ul { margin: 8px 0 14px 20px; padding: 0; }

li { margin: 6px 0; }

.meta {
  color: var(--muted);
  font-size: 0.98rem;
}

.notice {
  border-left: 3px solid var(--accent);
  padding: 10px 12px;
  background: rgba(110, 231, 255, 0.06);
  border-radius: 10px;
  margin: 14px 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.tile {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.02);
}

.tile h3 { margin: 4px 0 6px; }

.tile p { color: var(--muted); margin: 0 0 10px; }

.tile a {
  text-decoration: none;
  font-weight: 600;
}

footer {
  margin-top: 40px;
  color: var(--muted);
  font-size: 0.95rem;
}

.code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 2px 6px;
}