:root {
  --bg: #ffffff;
  --bg-subtle: #f6f7f9;
  --border: #e2e6ec;
  --text: #1a1d21;
  --text-muted: #5c6570;
  --accent: #2563eb;
  --nav-width: 280px;
  --nav-collapsed: 48px;
  --agent-width: 600px;
  --topbar-height: 52px;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
}

.platform-topbar {
  height: var(--topbar-height);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1rem;
  background: var(--bg);
}

.platform-topbar .brand {
  font-weight: 600;
  font-size: 1rem;
}

.platform-topbar .context {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.platform-body {
  display: flex;
  height: calc(100vh - var(--topbar-height));
}

.platform-nav {
  width: var(--nav-width);
  border-right: 1px solid var(--border);
  background: var(--bg-subtle);
  padding: 0.75rem 0;
  overflow-y: auto;
  flex-shrink: 0;
}

.platform-nav.collapsed {
  width: var(--nav-collapsed);
}

.platform-nav a {
  display: block;
  padding: 0.5rem 1rem;
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
}

.platform-nav a:hover,
.platform-nav a.active {
  background: var(--bg);
  color: var(--accent);
}

.platform-agent {
  width: var(--agent-width);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  background: var(--bg);
}

.platform-agent-header {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.875rem;
  font-weight: 600;
}

.platform-agent-transcript {
  flex: 1;
  padding: 1rem;
  overflow-y: auto;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.platform-agent-input {
  border-top: 1px solid var(--border);
  padding: 0.75rem;
}

.platform-agent-input textarea {
  width: 100%;
  min-height: 4rem;
  resize: vertical;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.5rem;
  font: inherit;
}

.platform-canvas {
  flex: 1;
  overflow: auto;
  padding: 1.5rem;
}

.platform-canvas h1 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 1rem;
}

.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-subtle);
}

.auth-card {
  width: 100%;
  max-width: 320px;
  padding: 2rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.auth-card h1 {
  font-size: 1.125rem;
  margin: 0 0 1.25rem;
  text-align: center;
}

.auth-card input {
  width: 100%;
  margin-bottom: 0.75rem;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font: inherit;
}

.auth-card button {
  width: 100%;
  padding: 0.6rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  font: inherit;
  cursor: pointer;
}

.auth-card .message {
  margin-top: 0.75rem;
  font-size: 0.875rem;
  text-align: center;
  color: var(--text-muted);
}

.powered-by {
  margin-top: 2rem;
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.compute-lab-lead {
  max-width: 42rem;
  color: var(--text-muted);
}

.compute-lab-panel {
  margin-top: 1.25rem;
  padding: 1rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  max-width: 40rem;
}

.compute-lab-meta {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.35rem 1rem;
  margin: 1rem 0;
  font-size: 0.9rem;
}

.compute-lab-panel button {
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font: inherit;
}

.compute-lab-log {
  margin-top: 1rem;
  padding: 0.75rem;
  background: #f6f8fa;
  border-radius: 6px;
  font-size: 0.8rem;
  overflow: auto;
  max-height: 16rem;
}

.compute-lab-gov {
  margin: 0 0 0.75rem;
  font-size: 0.875rem;
  line-height: 1.45;
}

.compute-lab-warn {
  margin: 0 0 0.75rem;
  font-size: 0.875rem;
  line-height: 1.45;
  color: #9a3412;
  background: #fff7ed;
  border: 1px solid #fed7aa;
  border-radius: 6px;
  padding: 0.5rem 0.65rem;
}

.compute-lab-audit {
  margin-top: 1rem;
  font-size: 0.85rem;
}

.compute-lab-audit-list {
  margin: 0.5rem 0 0;
  padding-left: 1.25rem;
  line-height: 1.5;
}

.compute-lab-audit-list li {
  margin-bottom: 0.25rem;
}