/*
 * OFBT Demo — shared stylesheet
 *
 * Plain CSS, no framework. Edge-canonical: runs unmodified in any modern
 * browser; no build step. Style is functional, minimal, presentable for
 * stakeholder screenshare.
 */

:root {
  --fg: #1a1a1a;
  --fg-muted: #555;
  --bg: #fafafa;
  --bg-panel: #ffffff;
  --border: #d8d8d8;
  --border-strong: #a8a8a8;
  --accent: #0b5fff;
  --accent-bg: #eaf1ff;
  --good: #0a7c2f;
  --good-bg: #e6f4ea;
  --bad: #b3261e;
  --bad-bg: #fce8e6;
  --warn: #b06000;
  --code-bg: #f4f4f6;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  color: var(--fg);
  background: var(--bg);
  margin: 0;
  padding: 0;
}

header {
  border-bottom: 1px solid var(--border);
  background: var(--bg-panel);
  padding: 1.25rem 2rem;
}

header h1 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 600;
}

header .subtitle {
  margin-top: 0.25rem;
  color: var(--fg-muted);
  font-size: 0.95rem;
}

main {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 2rem;
}

.section {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

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

.section h3 {
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  font-size: 1rem;
  font-weight: 600;
}

.section .lead {
  margin: 0 0 1rem;
  color: var(--fg-muted);
}

.section .lead.spaced {
  margin-top: 1rem;
}

.back-link {
  margin-top: 0.5rem;
}

.callout ul,
.callout ol {
  margin: 0.5rem 0 0;
  padding-left: 1.25rem;
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 900px) {
  .split { grid-template-columns: 1fr; }
}

.panel {
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--code-bg);
  overflow: hidden;
}

.panel .panel-title {
  padding: 0.5rem 0.75rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--fg-muted);
  border-bottom: 1px solid var(--border);
  background: var(--bg-panel);
}

.panel pre {
  margin: 0;
  padding: 0.75rem;
  font-family: var(--mono);
  font-size: 0.85rem;
  line-height: 1.45;
  overflow-x: auto;
  max-height: 480px;
  overflow-y: auto;
}

button {
  font-family: var(--sans);
  font-size: 1rem;
  padding: 0.6rem 1.25rem;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 500;
}

button:hover { filter: brightness(1.1); }
button:disabled { opacity: 0.5; cursor: not-allowed; }

.controls {
  margin: 1rem 0;
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
}

.badge.good { background: var(--good-bg); color: var(--good); }
.badge.bad { background: var(--bad-bg); color: var(--bad); }
.badge.pending { background: var(--code-bg); color: var(--fg-muted); }

.assertion-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
}

.assertion-row:last-child { border-bottom: none; }

.assertion-row .desc { flex: 1; color: var(--fg); font-size: 0.95rem; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 2rem;
  text-align: center;
  color: var(--fg-muted);
  font-size: 0.85rem;
  margin-top: 2rem;
}

.provenance dt {
  font-weight: 600;
  margin-top: 0.5rem;
}

.provenance dd {
  margin: 0.25rem 0 0.5rem 1.5rem;
  color: var(--fg-muted);
  font-size: 0.9rem;
}

code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

.callout {
  border-left: 3px solid var(--accent);
  background: var(--accent-bg);
  padding: 0.75rem 1rem;
  margin: 1rem 0;
  border-radius: 0 4px 4px 0;
  font-size: 0.95rem;
}

.callout.warn {
  border-color: var(--warn);
  background: #fff8eb;
}

.phase-list {
  list-style: none;
  padding: 0;
}

.phase-list li {
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.phase-list li.shipped { background: var(--good-bg); }
.phase-list li.upcoming { background: var(--code-bg); color: var(--fg-muted); }