:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #14181f;
  --muted: #52596b;
  --accent: #2454c7;
  --accent-fg: #ffffff;
  --border: #dde1e8;
  --card-bg: #f5f7fa;
  --error-bg: #fdecec;
  --error-border: #c9302c;
  --error-fg: #7a1414;
  --focus: #2454c7;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10131a;
    --fg: #e8eaf0;
    --muted: #a7adbd;
    --accent: #7aa2ff;
    --accent-fg: #0b1020;
    --border: #2b3040;
    --card-bg: #171b26;
    --error-bg: #2a1616;
    --error-border: #e05a5a;
    --error-fg: #ff9d9d;
    --focus: #7aa2ff;
  }
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  font-size: 1rem;
}

.wrap {
  max-width: 40rem;
  margin: 0 auto;
  padding: 1.5rem 1.25rem;
}

h1, h2 { line-height: 1.25; }
h1 { font-size: 1.9rem; margin: 0 0 0.5rem; }
h2 { font-size: 1.3rem; margin: 2rem 0 0.75rem; }
h2:first-child { margin-top: 0; }

p { margin: 0 0 1rem; }

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

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.kicker {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--muted);
  margin: 0 0 0.75rem;
}

.subhead { color: var(--muted); font-size: 1.05rem; max-width: 34rem; }

.hero { padding-top: 3rem; padding-bottom: 2.5rem; }

.hero-cta { margin-top: 1.5rem; margin-bottom: 0; }

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 0.4rem;
  text-decoration: none;
  font-weight: 600;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-fg);
}

.btn-primary:hover { opacity: 0.9; }

code {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 0.25rem;
  padding: 0.1em 0.35em;
  font-size: 0.9em;
}

.diagram {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin: 1rem 0 1.5rem;
}

.diagram pre {
  margin: 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--fg);
  white-space: pre;
}

.steps {
  padding-left: 1.25rem;
  margin: 0 0 1rem;
}

.steps li { margin-bottom: 0.5rem; }

.why {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
  display: grid;
  gap: 0.6rem;
}

.why li {
  padding-left: 1.6rem;
  position: relative;
}

.why li::before {
  content: "\2713";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

.signup { padding-bottom: 3rem; }

.form-errors { margin-bottom: 1rem; }

.form-error {
  display: none;
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  color: var(--error-fg);
  border-radius: 0.4rem;
  padding: 0.75rem 1rem;
  margin: 0 0 0.75rem;
}

.form-error:target { display: block; }

.signup-form { max-width: 32rem; }

.field { margin-bottom: 1rem; }

.field label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.optional { font-weight: 400; color: var(--muted); }

input[type="email"],
input[type="text"],
textarea {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  background: var(--bg);
  color: var(--fg);
  font: inherit;
}

textarea { resize: vertical; }

.hp {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.privacy-note {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.release-meta { font-size: 1.05rem; }

.assets {
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem;
  display: grid;
  gap: 1rem;
}

.asset {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 1rem 1.25rem;
}

.asset-detail {
  margin: 0.6rem 0 0.25rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.asset-digest {
  display: block;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.75rem;
  color: var(--muted);
  background: none;
  border: none;
  padding: 0;
  overflow-wrap: anywhere;
}

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
  padding-top: 1.5rem;
  padding-bottom: 2.5rem;
}

.site-footer p { margin: 0 0 0.35rem; }

.article { padding-top: 2.5rem; padding-bottom: 3rem; }

.centered {
  padding-top: 4rem;
  padding-bottom: 4rem;
  text-align: center;
}

.centered p { max-width: 30rem; margin-left: auto; margin-right: auto; }