:root {
  --paper: #f3efe4;
  --ink: #1c1915;
  --muted: #5e564c;
  --line: #ddd4c3;
  --card: #fffdf8;
  --rust: #9a3412;
  --rust-soft: #f3e2d6;
  --green: #1f6b4a;
  --green-soft: #e5f2eb;
  --shadow: 0 1px 0 rgba(28, 25, 21, 0.04);
  font-family: "Segoe UI", system-ui, sans-serif;
  color: var(--ink);
  background: var(--paper);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
}

.top {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-end;
  padding: 28px 32px 12px;
}

.eyebrow {
  margin: 0 0 4px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 12px;
  color: var(--rust);
}

h1 {
  margin: 0;
  font-family: Palatino, "Palatino Linotype", Georgia, serif;
  font-size: 40px;
  font-weight: 600;
}

.meta { margin: 6px 0 0; color: var(--muted); }

button, input {
  font: inherit;
}

button {
  background: var(--ink);
  color: #fff;
  border: 0;
  border-radius: 999px;
  padding: 10px 16px;
  cursor: pointer;
}

button.secondary, button.copy {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}

button:hover { filter: brightness(1.08); }

.banner, .personas, .layout {
  margin: 0 32px;
}

.banner {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px 18px;
  box-shadow: var(--shadow);
}

.banner p { margin: 0 0 8px; line-height: 1.45; }
.banner p:last-child { margin: 0; }

.personas { margin-top: 18px; }

.section-label {
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
}

.persona-row {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
}

.persona {
  text-align: left;
  background: var(--card);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 10px 12px;
  min-width: 210px;
  white-space: normal;
}

.persona strong { display: block; }
.persona span { display: block; color: var(--muted); font-size: 13px; }

.layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 22px;
  padding: 18px 0 48px;
}

nav {
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-self: start;
  position: sticky;
  top: 12px;
}

.nav-note {
  margin: 10px 0 4px;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

nav button {
  text-align: left;
  border-radius: 12px;
  background: transparent;
  color: var(--ink);
  border: 1px solid transparent;
  padding: 10px 12px;
}

nav button small {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

nav button.active {
  background: var(--card);
  border-color: var(--line);
  box-shadow: inset 3px 0 0 var(--rust);
}

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 22px;
  box-shadow: var(--shadow);
}

.panel h2 {
  margin: 0 0 6px;
  font-family: Palatino, "Palatino Linotype", Georgia, serif;
  font-size: 30px;
}

.method {
  display: inline-block;
  margin-right: 8px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--rust-soft);
  color: var(--rust);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.path { color: var(--muted); font-family: Consolas, "Courier New", monospace; }

.when, .setup, .expect, .json, .message {
  margin-top: 14px;
  border-radius: 12px;
  padding: 12px 14px;
}

.when, .setup, .expect {
  background: #f7f4ec;
  border: 1px solid var(--line);
}

.when p, .expect p { margin: 8px 0 0; line-height: 1.45; }

.setup pre, .json pre {
  margin: 8px 0 0;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: Consolas, "Courier New", monospace;
  font-size: 13px;
  line-height: 1.45;
}

.toolbar {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

form.fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 16px;
}

label { display: flex; flex-direction: column; gap: 6px; font-size: 14px; }
label span { color: var(--muted); }

input {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 10px;
  padding: 10px 12px;
}

.form-actions { grid-column: 1 / -1; display: flex; gap: 8px; }

.message.ok { background: var(--green-soft); color: var(--green); }
.message.bad { background: var(--rust-soft); color: var(--rust); }

.cards {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.card {
  border: 1px solid var(--line);
  border-left: 4px solid var(--rust);
  border-radius: 12px;
  padding: 12px 14px;
  background: #fff;
}

.card h3 { margin: 0 0 8px; font-size: 18px; }

.card dl {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 4px 10px;
  margin: 0;
}

.card dt { color: var(--muted); }
.card dd { margin: 0; }

.json { background: #221e19; color: #f6f1e7; }

.sample { color: var(--muted); margin-top: 8px; }

@media (max-width: 860px) {
  .top, .banner, .personas, .layout { margin-left: 16px; margin-right: 16px; }
  .top { padding-left: 16px; padding-right: 16px; flex-direction: column; align-items: flex-start; }
  .layout { grid-template-columns: 1fr; }
  nav { position: static; }
  form.fields, .card dl { grid-template-columns: 1fr; }
}