:root {
  color-scheme: light;
  --bg: #f4f6f8;
  --panel: #ffffff;
  --text: #15202b;
  --muted: #5c6b77;
  --line: #d5dee6;
  --ok: #0a6a4b;
  --error-bg: #fff3f3;
  --error-line: #f0b7b7;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #ffffff 0%, var(--bg) 40%, #eaf0f4 100%);
  color: var(--text);
}

.shell-frame {
  max-width: 860px;
  margin: 0 auto;
  padding: 1.25rem;
  display: grid;
  gap: 0.9rem;
}

.shell-header {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem;
}

.shell-header-meta {
  margin-top: 0.75rem;
  display: grid;
  gap: 0.2rem;
}

.eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.74rem;
  color: var(--muted);
}

h1,
h2 {
  margin: 0 0 0.5rem;
}

h3 {
  margin: 0 0 0.5rem;
}

.status {
  margin: 0;
  color: var(--muted);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem;
}

.activity-host {
  display: grid;
  gap: 0.9rem;
}

.activity-host > h2 {
  margin: 0;
}

.panel.error {
  background: var(--error-bg);
  border-color: var(--error-line);
}

.keyvals {
  margin: 0;
  display: grid;
  grid-template-columns: minmax(110px, 180px) 1fr;
  row-gap: 0.5rem;
  column-gap: 0.75rem;
}

.keyvals dt {
  font-weight: 600;
  color: var(--muted);
}

.keyvals dd {
  margin: 0;
  word-break: break-word;
}

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

.placeholder-actions {
  margin-top: 0.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

button[disabled] {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.5rem 0.75rem;
  background: #f7fafc;
  color: #8695a3;
}

.error-text {
  margin: 0;
  white-space: pre-wrap;
  font-size: 0.9rem;
}

.ready {
  color: var(--ok);
  font-weight: 600;
}

.shell-footer {
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
}

@media (max-width: 680px) {
  .keyvals {
    grid-template-columns: 1fr;
  }
}