:root {
  --ink: #14231f;
  --muted: #586963;
  --surface: #f6f3ea;
  --paper: #fffdf7;
  --line: #cbd2ca;
  --accent: #0d6b4f;
  --accent-dark: #07533d;
  --focus: #d97706;
  --error: #9b2c2c;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--surface);
  line-height: 1.5;
}

* { box-sizing: border-box; }

body { margin: 0; min-height: 100vh; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 3.5rem;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

.brand { color: var(--ink); font-weight: 750; letter-spacing: -0.03em; text-decoration: none; }
.environment { color: var(--muted); font-size: 0.8125rem; }

main { width: min(54rem, 100%); margin: 0 auto; padding: 2.5rem 1rem 4rem; }
.intro { max-width: 42rem; margin-bottom: 2rem; }
h1 { margin: 0; font-size: clamp(2rem, 7vw, 4rem); line-height: 1; letter-spacing: -0.055em; }
.lede { max-width: 38rem; margin: 1rem 0 0; color: var(--muted); }
.auth-status { margin-top: 0.75rem; }
.auth-status .success { color: var(--accent-dark); font-weight: 650; }
.auth-status .error { color: var(--error); }

.search-panel, .chat-panel, .composer { padding: 1rem; border: 1px solid var(--line); background: var(--paper); }
.chat-panel { padding: 0; overflow: hidden; }
.chat-log {
  display: grid;
  gap: 0.75rem;
  min-height: 14rem;
  max-height: 32rem;
  overflow: auto;
  padding: 1rem;
}
.message { padding: 0.75rem 1rem; border-radius: 0.5rem; overflow-wrap: anywhere; }
.message p { margin: 0; }
.message.user { justify-self: end; max-width: 85%; background: #e7f3ee; }
.message.assistant { justify-self: stretch; background: var(--surface); border: 1px solid var(--line); }
.message.assistant .error { color: var(--error); font-weight: 650; }
.composer { border: 0; border-top: 1px solid var(--line); }
.field + .field { margin-top: 1rem; }
label { display: block; margin-bottom: 0.375rem; font-size: 0.875rem; font-weight: 700; }
.optional { color: var(--muted); font-weight: 500; }
input, textarea, button { min-height: 2.75rem; border: 1px solid var(--line); border-radius: 0.25rem; font: inherit; }
input, textarea { width: 100%; padding: 0.625rem 0.75rem; background: #fff; color: var(--ink); }
textarea { min-height: 4.5rem; resize: vertical; }
input::placeholder, textarea::placeholder { color: #788781; }
input:focus-visible, textarea:focus-visible, button:focus-visible, a:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.query-row { display: grid; grid-template-columns: 1fr; gap: 0.5rem; }
button { padding: 0.625rem 1rem; border-color: var(--accent); background: var(--accent); color: #fff; font-weight: 750; cursor: pointer; }
button:hover { background: var(--accent-dark); }
button:disabled { cursor: wait; opacity: 0.65; }
button.secondary { width: 100%; margin-top: 0.75rem; border-color: var(--line); background: transparent; color: var(--ink); }
button.secondary:hover { border-color: var(--ink); background: #eef1eb; }

.status { min-height: 1.5rem; margin: 1.5rem 0; color: var(--muted); }
.status.error { color: var(--error); font-weight: 650; }
.section-heading { display: flex; align-items: baseline; justify-content: space-between; border-bottom: 1px solid var(--ink); }
h2 { margin: 0 0 0.5rem; font-size: 1rem; letter-spacing: 0.02em; }
#result-count { color: var(--muted); font-size: 0.875rem; }
.results { margin: 0; padding: 0; list-style: none; }
.result { padding: 1.25rem 0; border-bottom: 1px solid var(--line); }
.result h3 { margin: 0; font-size: 1.125rem; }
.result p { margin: 0.5rem 0; white-space: pre-wrap; overflow-wrap: anywhere; }
.meta { color: var(--muted); font-size: 0.8125rem; }
.source-label { font-weight: 700; color: var(--accent-dark); }
.result .match-source { color: var(--accent-dark); font-size: 0.8125rem; font-weight: 750; }
.open-document { margin-top: 0.75rem; }
.attachment { margin-top: 1rem; padding: 1rem; border-left: 0.25rem solid var(--accent); background: var(--paper); }
.attachment h4 { margin: 0 0 0.5rem; }
.attachment-text {
  margin: 0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  font: inherit;
}
.message section { padding: 0.5rem 0; }
.message h3 { margin: 0 0 0.5rem; font-size: 1rem; }
.message h4 { margin: 0; font-size: 1rem; }
.message ul { display: grid; gap: 0.875rem; margin: 0; padding: 0; list-style: none; }
.message li p { margin: 0.25rem 0 0; color: var(--muted); }
.purchase-summary .total { margin: 0; font-size: clamp(1.5rem, 5vw, 2.25rem); font-weight: 800; }
.purchase-sources blockquote {
  margin: 0.375rem 0 0;
  padding-left: 0.75rem;
  border-left: 0.2rem solid var(--accent);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

footer { padding: 1.5rem 1rem; border-top: 1px solid var(--line); color: var(--muted); text-align: center; font-size: 0.8125rem; }

@media (min-width: 40rem) {
  .topbar { padding-inline: 2rem; }
  main { padding-top: 4rem; }
  .search-panel, .composer { padding: 1.5rem; }
  .query-row { grid-template-columns: 1fr auto; align-items: end; }
  button.secondary { width: auto; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; }
}