:root {
  --bg: #0a0d15;
  --bg-panel: #121622;
  --bg-panel-2: #1a1f2d;
  --text: #e9ecf2;
  --text-muted: #8a93a6;
  --accent: #2a76eb;
  --accent-soft: rgba(42, 118, 235, 0.15);
  --border: rgba(255, 255, 255, 0.08);
  --radius: 14px;
  --radius-lg: 18px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.55;
}

.container {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 24px;
}

.hero {
  padding: 44px 0 20px;
  background:
    radial-gradient(1000px 400px at 80% -10%, rgba(42, 118, 235, 0.18), transparent 60%),
    radial-gradient(600px 300px at 0% 0%, rgba(42, 118, 235, 0.08), transparent 50%);
  border-bottom: 1px solid var(--border);
}

.hero .container {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 18px;
}

.icon {
  border-radius: 22%;
  background: var(--bg-panel);
  flex-shrink: 0;
}

.hero h1 {
  font-size: clamp(26px, 5vw, 36px);
  line-height: 1.15;
  margin: 0 0 4px;
  letter-spacing: -0.01em;
}

.hero h1 .muted {
  color: var(--text-muted);
  font-weight: 500;
}

.tagline {
  color: var(--text-muted);
  margin: 0;
  font-size: 15px;
}

.hero-nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.hero-nav a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  font-size: 15px;
  padding: 6px 2px;
  border-bottom: 1px solid transparent;
}

.hero-nav a:hover {
  border-bottom-color: var(--accent);
}

main {
  padding: 32px 0 48px;
}

.card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin: 0 0 20px;
}

.card h2 {
  margin-top: 0;
  font-size: 22px;
  letter-spacing: -0.01em;
}

.card h3 {
  font-size: 17px;
  margin-top: 24px;
  margin-bottom: 6px;
}

.card p, .card li { color: #cfd4e0; }
.card a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(42, 118, 235, 0.35);
}
.card a:hover { border-bottom-color: var(--accent); }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin: 0 0 20px;
}

.feature {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.feature h3 {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}
.feature p {
  margin: 0;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.5;
}

.steps {
  padding-left: 20px;
}
.steps li {
  margin: 10px 0;
}
.steps ul {
  margin: 6px 0 0 0;
}

code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--bg-panel-2);
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: 6px;
  color: #cfe0ff;
}

details {
  border-top: 1px solid var(--border);
  padding: 14px 0;
}
details:first-of-type { border-top: 0; }

summary {
  cursor: pointer;
  font-weight: 500;
  list-style: none;
  position: relative;
  padding-right: 24px;
}
summary::-webkit-details-marker { display: none; }
summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 0;
  color: var(--text-muted);
  font-weight: 300;
  font-size: 22px;
  line-height: 1;
  transition: transform 0.15s;
}
details[open] summary::after {
  content: "–";
}

details p, details ol, details ul {
  margin-top: 8px;
  color: var(--text-muted);
}

.button {
  display: inline-block;
  background: var(--accent);
  color: #fff !important;
  padding: 10px 18px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 500;
  border: 0 !important;
}
.button:hover {
  background: #1f66d0;
}

.fine {
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.5;
}

footer {
  border-top: 1px solid var(--border);
  padding: 28px 0 40px;
  background: var(--bg-panel);
}
footer .fine {
  margin: 0 0 8px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f8fa;
    --bg-panel: #ffffff;
    --bg-panel-2: #f0f2f5;
    --text: #11141b;
    --text-muted: #596070;
    --border: rgba(17, 20, 27, 0.08);
  }
  .card p, .card li { color: #2a2f3c; }
  .feature { background: #ffffff; }
  code { color: #134494; }
}