:root {
  color-scheme: light dark;
  --fg: #111;
  --bg: #fafafa;
  --panel: #fff;
  --muted: #555;
  --border: #e5e5e5;
  --accent: #2b6cb0;
  --user-bg: #e6f0fa;
  --system-bg: #f3f3f3;
  --row-hover: #eef3f8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #eee;
    --bg: #111;
    --panel: #1a1a1a;
    --muted: #aaa;
    --border: #2a2a2a;
    --accent: #63b3ed;
    --user-bg: #1e3a5f;
    --system-bg: #222;
    --row-hover: #2a3a4d;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--fg);
  background: var(--bg);
}

.app {
  max-width: 48rem;
  margin: 0 auto;
  min-height: 100vh;
  padding: 1.5rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

header h1 {
  margin: 0;
  font-size: 1.75rem;
  letter-spacing: -0.02em;
}

.tagline {
  margin: 0.25rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.transcript {
  flex: 1;
  overflow-y: auto;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  min-height: 20rem;
}

.msg {
  max-width: 92%;
  padding: 0.6rem 0.85rem;
  border-radius: 0.6rem;
  line-height: 1.4;
  font-size: 0.95rem;
  word-wrap: break-word;
}

.msg-system {
  align-self: flex-start;
  background: var(--system-bg);
}

.msg-user {
  align-self: flex-end;
  background: var(--user-bg);
}

.msg-loading {
  opacity: 0.6;
  font-style: italic;
}

.list-meta {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.4rem;
}

.invoice-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.invoice-row-button {
  width: 100%;
  text-align: left;
  padding: 0.4rem 0.55rem;
  font: inherit;
  color: inherit;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 0.4rem;
  cursor: pointer;
}

.invoice-row-button:hover {
  background: var(--row-hover);
  border-color: var(--border);
}

.aggregate-title {
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.aggregate-fields {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.25rem 0.75rem;
  margin: 0 0 0.75rem;
}

.aggregate-fields dt {
  color: var(--muted);
}

.aggregate-fields dd {
  margin: 0;
}

.aggregate-subheading {
  font-weight: 600;
  margin: 0.25rem 0 0.4rem;
  color: var(--muted);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.aggregate-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.aggregate-table th,
.aggregate-table td {
  padding: 0.3rem 0.5rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

.aggregate-table th {
  color: var(--muted);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.prompt-form {
  display: flex;
  gap: 0.5rem;
}

.prompt-input {
  flex: 1;
  padding: 0.65rem 0.85rem;
  font: inherit;
  color: inherit;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 0.6rem;
}

.prompt-input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

button[type="submit"] {
  padding: 0.65rem 1.1rem;
  font: inherit;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: white;
  border-radius: 0.6rem;
  cursor: pointer;
}

button[type="submit"]:hover {
  filter: brightness(1.05);
}