/* Lean Agent Kernel Kit — paper monograph. No CDNs. System fonts only. */

:root {
  --paper: #f3eee4;
  --ink: #1c1814;
  --muted: #5a5348;
  --rule: #c8bfb0;
  --rule-strong: #8a8070;
  --code-bg: #e7e0d2;
  --oxblood: #6b2d22;
  --disabled: #8a8070;
  --sheet: #faf6ee;
}

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

html {
  font-size: 18px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Palatino, "Palatino Linotype", "Iowan Old Style", "Sitka Text", Charter, Georgia, "Times New Roman", serif;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
}

.sheet {
  max-width: 40rem;
  margin: 0 auto;
  padding: 2.25rem 1.35rem 4rem;
}

@media (min-width: 720px) {
  body {
    background:
      linear-gradient(90deg, #e8e0d2 0, #e8e0d2 12px, transparent 12px),
      var(--paper);
  }
  .sheet {
    background: var(--sheet);
    margin: 2rem auto 4rem;
    padding: 3rem 3.25rem 4rem;
    border: 1px solid var(--rule);
    box-shadow: 0 1px 0 rgba(28, 24, 20, 0.04);
  }
}

.masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--rule-strong);
  margin-bottom: 1.5rem;
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: inherit;
  text-decoration: none;
}

.wordmark img {
  display: block;
  flex: 0 0 auto;
}

.wordmark-text {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}

.wm-small {
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.wm-large {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.meta {
  margin: 0;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.disclosure {
  margin: 0 0 1.75rem;
  padding: 0.9rem 0 1rem;
  border-bottom: 1px solid var(--rule);
  font-size: 1rem;
}

h1 {
  font-size: 1.45rem;
  font-weight: 600;
  line-height: 1.3;
  margin: 0 0 1rem;
}

.lede {
  margin: 0 0 2rem;
  color: var(--ink);
}

h2 {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--oxblood);
  margin: 2.25rem 0 0.7rem;
  padding-top: 0.4rem;
  border-top: 1px solid var(--rule);
}

h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0 0 0.25rem;
}

section { margin: 0; }

p, ul { margin: 0 0 0.85rem; }

ul {
  padding-left: 1.2rem;
}

li { margin-bottom: 0.35rem; }

a {
  color: var(--oxblood);
  text-underline-offset: 0.15em;
}

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

code, pre {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 0.82rem;
}

code {
  background: var(--code-bg);
  padding: 0.08em 0.28em;
  border-radius: 2px;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--rule);
  padding: 0.85rem 1rem;
  overflow-x: auto;
  margin: 0 0 1rem;
  line-height: 1.4;
}

pre code {
  background: none;
  padding: 0;
  font-size: 0.82rem;
}

.note {
  color: var(--muted);
  font-size: 0.95rem;
}

.split {
  display: grid;
  gap: 1rem;
}

@media (min-width: 640px) {
  .split { grid-template-columns: 1fr 1fr; }
}

.card {
  border: 1px solid var(--rule);
  padding: 1rem 1.05rem 0.4rem;
  background: var(--paper);
}

.card .price {
  margin: 0 0 0.7rem;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 0.78rem;
  color: var(--oxblood);
  letter-spacing: 0.03em;
}

.card ul { padding-left: 1.05rem; }

cite { font-style: italic; }

.buy {
  margin-top: 2.5rem;
  padding: 1.25rem 0 0.25rem;
}

.price-line {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  margin-bottom: 0.85rem;
}

button[disabled] {
  display: block;
  width: 100%;
  max-width: 100%;
  padding: 0.85rem 1rem;
  margin: 0 0 0.75rem;
  border: 1px dashed var(--rule-strong);
  background: transparent;
  color: var(--disabled);
  font-family: inherit;
  font-size: 0.95rem;
  line-height: 1.35;
  text-align: center;
  cursor: not-allowed;
}

.dl {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
  margin: 0.5rem 0 0.85rem;
}

.dl-link {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 0.9rem;
  font-weight: 600;
}

.dl-meta {
  font-size: 0.85rem;
  color: var(--muted);
}

.checksum-label {
  margin: 0 0 0.3rem;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.checksum {
  word-break: break-all;
  white-space: pre-wrap;
}

footer {
  margin-top: 2.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule-strong);
  color: var(--muted);
  font-size: 0.88rem;
}

footer p { margin: 0 0 0.35rem; }

@media print {
  body, .sheet {
    background: #fff;
    box-shadow: none;
    border: none;
    margin: 0;
    padding: 0;
    max-width: none;
  }
  button { display: none; }
  a { color: inherit; text-decoration: none; }
}