:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --text: #f8fafc;
  --muted: #94a3b8;
  --accent: #10b981;
  --accent-hover: #059669;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.skip-link {
  position: absolute;
  top: -3rem;
  left: 1rem;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: #042f1a;
  font-weight: 700;
  text-decoration: none;
  border-radius: 0.375rem;
  z-index: 100;
  transition: top 0.15s ease;
}

.skip-link:focus {
  top: 1rem;
  outline: 3px solid #fff;
  outline-offset: 2px;
}

.site-header,
main,
footer {
  max-width: 42rem;
  margin: 0 auto;
  padding: 1.5rem;
}

.section-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  margin-bottom: 1rem;
  font-size: 0.875rem;
}

.section-nav a {
  color: var(--muted);
  text-decoration: none;
}

.section-nav a:hover,
.section-nav a:focus {
  color: var(--accent);
  text-decoration: underline;
  outline: none;
}

.section-nav a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 0.25rem;
}

.eyebrow {
  color: var(--accent);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  line-height: 1.2;
  margin: 0.5rem 0 1rem;
}

.lede {
  font-size: 1.125rem;
  color: var(--muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.panel {
  background: var(--surface);
  border-radius: 0.75rem;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
}

.panel h2 {
  margin-top: 0;
  font-size: 1.125rem;
}

.steps ol {
  margin: 0;
  padding-left: 1.25rem;
}

.cta {
  text-align: center;
  padding: 2rem 1.5rem;
}

.button-primary,
.button-secondary {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-weight: 700;
  text-decoration: none;
  border-radius: 0.5rem;
  border: 2px solid transparent;
}

.button-primary {
  background: var(--accent);
  color: #042f1a;
}

.button-secondary {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent);
}

.button-primary:hover,
.button-primary:focus,
.button-secondary:hover,
.button-secondary:focus {
  background: var(--accent-hover);
  color: #fff;
  border-color: var(--accent-hover);
}

.button-primary:focus-visible,
.button-secondary:focus-visible,
.button-signup:focus-visible {
  outline: 3px solid #fff;
  outline-offset: 2px;
}

.cta .button-primary {
  margin-top: 0.75rem;
}

.note {
  font-size: 0.875rem;
  color: var(--muted);
}

footer {
  font-size: 0.75rem;
  color: var(--muted);
  border-top: 1px solid var(--surface);
}

footer code {
  font-size: 0.7rem;
  color: var(--text);
}

/* #75 mission expansion */
.mission-list {
  margin: 0.75rem 0;
  padding-left: 1.25rem;
}

.mission-list li {
  margin-bottom: 0.5rem;
}

.mission-note {
  font-size: 0.9rem;
  color: var(--muted);
  margin-top: 0.75rem;
  margin-bottom: 0;
  font-style: italic;
}

/* #76 tester signup */
.signup-intro {
  color: var(--muted);
  margin-top: 0;
}

.signup-form {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.signup-form label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--muted);
  margin-top: 0.5rem;
}

.signup-form input,
.signup-form select {
  padding: 0.5rem 0.75rem;
  background: var(--bg);
  border: 1px solid #334155;
  border-radius: 0.375rem;
  color: var(--text);
  font-size: 1rem;
  font-family: inherit;
}

.signup-form input:focus,
.signup-form select:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.button-signup {
  margin-top: 0.75rem;
  padding: 0.625rem 1.25rem;
  background: var(--accent);
  color: #042f1a;
  font-weight: 700;
  font-size: 1rem;
  font-family: inherit;
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
  align-self: flex-start;
}

.button-signup:hover,
.button-signup:focus {
  background: var(--accent-hover);
  color: #fff;
}

.signup-note {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0.25rem 0 0;
}

.signup-status {
  font-size: 0.875rem;
  color: var(--accent);
  margin: 0.5rem 0 0;
}

@media (max-width: 480px) {
  .site-header,
  main,
  footer {
    padding: 1rem;
  }

  .hero-actions {
    flex-direction: column;
  }

  .button-primary,
  .button-secondary {
    text-align: center;
    width: 100%;
  }

  .section-nav {
    font-size: 0.8rem;
  }
}