:root {
  --fed-bg: #0f1113;
  --fed-surface: #171a1d;
  --fed-text: #e8ecef;
  --fed-muted: rgba(232, 236, 239, 0.62);
  --fed-accent: #3dcda8;
  --fed-border: rgba(232, 236, 239, 0.1);
  --fed-font: 'IBM Plex Sans', system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--fed-bg);
  color: var(--fed-text);
  font-family: var(--fed-font);
  line-height: 1.6;
}

.fed-page {
  max-width: 920px;
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 4rem) clamp(1.25rem, 4vw, 2rem) 3rem;
}

.fed-eyebrow {
  margin: 0 0 0.5rem;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fed-muted);
}

.fed-header h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.fed-lead {
  margin: 0 0 1.5rem;
  font-size: 1.05rem;
  color: var(--fed-muted);
  max-width: 52rem;
}

.fed-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.fed-btn {
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 1rem;
  border: 1px solid var(--fed-border);
  border-radius: 6px;
  color: var(--fed-text);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
}

.fed-btn--primary {
  background: rgba(61, 205, 168, 0.14);
  border-color: rgba(61, 205, 168, 0.35);
}

.fed-section {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--fed-border);
}

.fed-section h2 {
  margin: 0 0 1rem;
  font-size: 1.15rem;
  font-weight: 600;
}

.fed-steps {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--fed-muted);
}

.fed-steps li + li {
  margin-top: 0.55rem;
}

.fed-modules {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.fed-modules li {
  padding: 0.85rem 1rem;
  background: var(--fed-surface);
  border: 1px solid var(--fed-border);
  border-radius: 8px;
}

.fed-modules a {
  color: var(--fed-accent);
  font-weight: 500;
  text-decoration: none;
}

.fed-modules p {
  margin: 0.35rem 0 0;
  font-size: 0.9rem;
  color: var(--fed-muted);
}

.fed-section--grid {
  display: grid;
  gap: 1rem;
}

@media (min-width: 720px) {
  .fed-section--grid {
    grid-template-columns: 1fr 1fr;
  }
}

.fed-card {
  padding: 1rem 1.1rem;
  background: var(--fed-surface);
  border: 1px solid var(--fed-border);
  border-radius: 8px;
}

.fed-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.fed-card p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--fed-muted);
}

.fed-links {
  margin: 0;
  padding-left: 1.1rem;
}

.fed-links a {
  color: var(--fed-accent);
}

.fed-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--fed-border);
  font-size: 0.82rem;
  color: var(--fed-muted);
}

.fed-footer p {
  margin: 0.25rem 0;
}

code {
  font-size: 0.88em;
  color: rgba(232, 236, 239, 0.88);
}

.fed-textarea {
  width: 100%;
  min-height: 280px;
  resize: vertical;
  padding: 1rem;
  background: #0c0e10;
  border: 1px solid var(--fed-border);
  border-radius: 8px;
  color: var(--fed-text);
  font-family: 'IBM Plex Mono', ui-monospace, 'Cascadia Code', monospace;
  font-size: 0.85rem;
  line-height: 1.5;
}

.fed-textarea:focus {
  outline: none;
  border-color: rgba(61, 205, 168, 0.45);
}

.fed-result {
  padding: 1rem 1.1rem;
  background: var(--fed-surface);
  border: 1px solid var(--fed-border);
  border-radius: 8px;
  font-family: 'IBM Plex Mono', ui-monospace, 'Cascadia Code', monospace;
  font-size: 0.88rem;
  color: var(--fed-muted);
  white-space: pre-wrap;
}

.fed-result p {
  margin: 0.2rem 0;
}

.fed-result--ok {
  border-color: rgba(61, 205, 168, 0.5);
  color: var(--fed-accent);
}

.fed-result--error {
  border-color: rgba(229, 115, 115, 0.5);
  color: #f0a8a8;
}

button.fed-btn {
  cursor: pointer;
  font-family: var(--fed-font);
}

.fed-callout {
  background: rgba(61, 205, 168, 0.06);
  border: 1px solid rgba(61, 205, 168, 0.25);
  border-radius: 10px;
  padding: 1.25rem 1.4rem;
  margin-top: 2rem;
}

.fed-callout h2 {
  margin-top: 0;
}

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