:root {
  --bg: #f7f7f5;
  --surface: #ffffff;
  --text: #1c1c1a;
  --muted: #6b6b66;
  --border: #e2e2dd;
  --accent: #2f5bd3;
  --accent-text: #ffffff;
  --danger: #b3261e;
  --mark: #ffe58a;
  --ok: #1f7a3d;
  --warn: #9a6700;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161615;
    --surface: #1f1f1d;
    --text: #ececea;
    --muted: #a0a09a;
    --border: #33332f;
    --accent: #7c9cf5;
    --accent-text: #10131c;
    --danger: #f2877e;
    --mark: #6b5a12;
    --ok: #6fcf8f;
    --warn: #e5b94f;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.centred {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
}

header {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 10;
}

header .account {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 12px;
}

header .brand {
  font-weight: 600;
  letter-spacing: -0.02em;
}

nav a:hover {
  color: var(--text);
}

nav {
  display: flex;
  gap: 4px;
}

nav a {
  padding: 6px 12px;
  border-radius: 6px;
  color: var(--muted);
  text-decoration: none;
}

nav a[aria-current="page"] {
  background: var(--bg);
  color: var(--text);
  font-weight: 600;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 24px 64px;
}

h1 {
  margin: 0 0 20px;
  font-size: 26px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

h2 {
  margin: 28px 0 12px;
  font-size: 17px;
}

.panel {
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
}

form.row {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

input[type="text"],
textarea {
  flex: 1;
  min-width: 0;
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
}

textarea {
  min-height: 110px;
  resize: vertical;
}

button {
  padding: 9px 16px;
  border: 1px solid var(--accent);
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-text);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

button:disabled {
  opacity: 0.5;
  cursor: default;
}

button.plain {
  border-color: var(--border);
  background: transparent;
  color: var(--text);
  font-weight: 400;
}

button.danger {
  border-color: transparent;
  background: transparent;
  color: var(--danger);
  font-weight: 400;
}

.message {
  margin-top: 12px;
  color: var(--muted);
}

.message.error {
  color: var(--danger);
}

.documents {
  width: 100%;
  border-collapse: collapse;
}

.documents td {
  padding: 10px 8px;
  border-top: 1px solid var(--border);
  vertical-align: middle;
}

.documents .meta {
  color: var(--muted);
  font-size: 14px;
}

.status {
  font-size: 13px;
  font-weight: 600;
}

.status.ready {
  color: var(--ok);
}

.status.queued,
.status.processing {
  color: var(--warn);
}

.status.failed {
  color: var(--danger);
}

.answer {
  white-space: pre-wrap;
}

.marker {
  padding: 0 4px;
  border: none;
  background: none;
  color: var(--accent);
  font-weight: 600;
}

.refusal {
  border-left: 4px solid var(--warn);
}

.citations {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 16px;
}

.citations button {
  text-align: left;
}

.context {
  margin-top: 20px;
}

.context .source {
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 14px;
}

.context .text {
  max-height: 360px;
  overflow-y: auto;
  white-space: pre-wrap;
}

mark {
  padding: 1px 0;
  background: var(--mark);
  color: inherit;
}

.empty {
  color: var(--muted);
}

.heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.meta {
  color: var(--muted);
  font-size: 14px;
}

.question {
  margin: 6px 0 16px;
  font-size: 19px;
  font-weight: 600;
}

p.row {
  display: flex;
  align-items: center;
  gap: 12px;
}

#result {
  margin-top: 16px;
}

.grade {
  margin: 0 0 8px;
  font-size: 20px;
  font-weight: 700;
}

.grade.low {
  color: var(--danger);
}

.grade.mid {
  color: var(--warn);
}

.grade.high {
  color: var(--ok);
}

main.narrow {
  width: 100%;
  max-width: 380px;
  padding: 0;
}

.mark {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.02em;
  text-align: center;
}

.tagline {
  margin: 6px 0 24px;
  color: var(--muted);
  font-size: 14px;
  text-align: center;
  text-wrap: balance;
}

main.narrow h1 {
  font-size: 19px;
  margin-bottom: 18px;
}

label {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
}

input[type="email"],
input[type="password"] {
  width: 100%;
  margin-bottom: 16px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
}

input[type="email"]:focus,
input[type="password"]:focus {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
  border-color: transparent;
}

main.narrow button[type="submit"] {
  width: 100%;
}

button.link {
  padding: 0;
  border: 0;
  background: none;
  color: var(--accent);
  font: inherit;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}

button.link:hover {
  opacity: 0.8;
}