* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: #1f2937;
  background: #f7f8fa;
  line-height: 1.5;
}
#app {
  max-width: 42rem;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}
#app h1 {
  font-size: 1.75rem;
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
}
#app h2 {
  font-size: 1.05rem;
  margin: 0 0 0.75rem;
}
.tagline { color: #6b7280; margin: 0 0 1.5rem; }

/* product catalogue */
.catalog {
  list-style: none;
  margin: 0 0 1.25rem;
  padding: 0;
  border: 1px solid #e5e7eb;
  border-radius: 0.5rem;
  overflow: hidden;
  background: #ffffff;
}
.catalog li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1rem;
}
.catalog li + li { border-top: 1px solid #e5e7eb; }
.item { font-weight: 500; }

/* buttons */
.btn {
  font: inherit;
  font-weight: 500;
  color: #1f2937;
  background: #ffffff;
  border: 1px solid #d1d5db;
  border-radius: 0.5rem;
  padding: 0.4rem 0.9rem;
  cursor: pointer;
  transition: background-color 0.12s ease, border-color 0.12s ease;
}
.btn:hover { background: #f3f4f6; border-color: #9ca3af; }
.btn:active { background: #e5e7eb; }
.btn:focus-visible { outline: 2px solid #2563eb; outline-offset: 2px; }

/* status panel (search + metrics) */
.panel {
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 0.5rem;
  padding: 1rem;
  margin: 0 0 1.25rem;
}
.search-row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}
.search-input {
  font: inherit;
  flex: 1;
  min-width: 0;
  padding: 0.4rem 0.75rem;
  border: 1px solid #d1d5db;
  border-radius: 0.5rem;
}
.search-input:focus-visible { outline: 2px solid #2563eb; outline-offset: 2px; }
.meta { color: #6b7280; font-size: 0.9rem; margin: 0.25rem 0; }

/* basket */
.basket {
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 0.5rem;
  padding: 1rem;
  margin: 0 0 1.25rem;
}
.basket-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.basket-list li {
  display: flex;
  justify-content: space-between;
  padding: 0.4rem 0;
}
.basket-list li + li { border-top: 1px solid #f3f4f6; }
.qty { color: #6b7280; font-variant-numeric: tabular-nums; }
.total {
  font-weight: 600;
  border-top: 1px solid #e5e7eb;
  padding-top: 0.6rem;
  margin: 0.5rem 0 0;
}

.nav { margin: 0; }

/* multitasking / dataflow demo (merchant-flow.glon SVG) */
svg.flow { display: block; max-width: 100%; height: auto; }
.flow .node { fill: #ffffff; stroke: #1f2937; stroke-width: 1.5; }
.flow .edge { stroke: #9ca3af; stroke-width: 1.5; }
.flow .label { fill: #1f2937; font: 13px system-ui, sans-serif; }
ul.flow-log { margin: 0 0 1.25rem; padding-left: 1.25rem; font-size: 0.95rem; }
ul.flow-log li { margin: 0.2rem 0; }

/* tuple-space / dataflow demo (canvas visualization) */
canvas#glon-canvas { display: block; max-width: 100%; height: auto; border: 1px solid #e5e7eb; border-radius: 4px; }