:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #2563eb;
  --accent-fg: #ffffff;
  --sidebar-bg: #f9fafb;
  --danger: #b91c1c;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17181c;
    --fg: #e6e6e6;
    --muted: #9ca3af;
    --border: #2d2f36;
    --accent: #3b82f6;
    --accent-fg: #0b0d12;
    --sidebar-bg: #1d1f26;
    --danger: #f87171;
  }
}

* { box-sizing: border-box; }

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

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

.centered {
  height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
}

.centered h1 { margin: 0 0 0.5rem; font-size: 1.25rem; }
.centered p { margin: 0; color: var(--muted); max-width: 28rem; }

.chat-layout {
  display: flex;
  height: 100vh;
}

.sidebar {
  width: 220px;
  flex-shrink: 0;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.signed-in-as {
  margin: 0;
  padding: 0.5rem 0.75rem 0;
  font-size: 0.8rem;
  overflow-wrap: anywhere;
}

.sidebar-header {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.sidebar-header button {
  flex: 1;
  padding: 0.4rem 0.5rem;
  font-size: 0.85rem;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  border-radius: 6px;
  cursor: pointer;
}

#thread-list {
  list-style: none;
  margin: 0;
  padding: 0.5rem;
  overflow-y: auto;
}

#thread-list li {
  padding: 0.5rem 0.6rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--fg);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

#thread-list li.active,
#thread-list li:hover {
  background: var(--border);
}

.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.message-list {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.message {
  max-width: 70%;
  padding: 0.5rem 0.75rem;
  border-radius: 10px;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.message-user {
  align-self: flex-end;
  background: var(--accent);
  color: var(--accent-fg);
}

.message-assistant {
  align-self: flex-start;
  background: var(--sidebar-bg);
  border: 1px solid var(--border);
}

/* A send failure, rendered inline in the conversation but never
   persisted as a message (app.js's showSendFailure). */
.message-error {
  align-self: center;
  max-width: 90%;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}

/* The in-flight "Working... (N s)" row (app.js's startWorkingIndicator);
   removed on success and failure, never persisted. */
.message-working {
  align-self: center;
  background: transparent;
  color: var(--muted);
  font-size: 0.9rem;
}

.message-form {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem;
  border-top: 1px solid var(--border);
}

.message-form input {
  flex: 1;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--fg);
  font-size: 0.95rem;
}

.message-form button {
  padding: 0.6rem 1.1rem;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-fg);
  font-size: 0.95rem;
  cursor: pointer;
}

.message-form button:disabled {
  opacity: 0.6;
  cursor: default;
}

.storage-warning {
  margin: 0.5rem 1rem 0;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  background: var(--warning-bg, #4a3a1a);
  color: var(--warning-fg, #f0d9a0);
  font-size: 0.85rem;
}

.history-notice {
  margin: 0.5rem 1rem 0;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  background: var(--sidebar-bg);
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
}

.welcome-panel {
  margin: 0.75rem 1rem 0;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  background: var(--sidebar-bg);
  border: 1px solid var(--border);
  font-size: 0.85rem;
}

.welcome-panel p {
  margin: 0 0 0.5rem;
  color: var(--fg);
}

.welcome-panel p:last-of-type {
  margin-bottom: 0.75rem;
}

.welcome-starter-heading {
  font-weight: 600;
}

.welcome-panel button {
  padding: 0.35rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
}

.error-recovery-action {
  margin-top: 0.75rem !important;
  font-size: 0.85rem;
}

/* --- Projects (build spec §10) ----------------------------------------- */

.projects-section {
  border-top: 1px solid var(--border);
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.sidebar-heading {
  margin: 0;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.project-switcher {
  display: flex;
  gap: 0.4rem;
}

.project-switcher select {
  flex: 1;
  min-width: 0;
  padding: 0.35rem 0.4rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--fg);
  font-size: 0.85rem;
}

.project-switcher button {
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
}

.project-actions {
  display: flex;
  gap: 0.4rem;
}

.project-actions button {
  flex: 1;
  padding: 0.3rem 0.4rem;
  font-size: 0.8rem;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  border-radius: 6px;
  cursor: pointer;
}

.project-actions button:disabled {
  opacity: 0.5;
  cursor: default;
}

.project-file-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 8rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.project-file-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.4rem;
  font-size: 0.8rem;
  padding: 0.25rem 0.4rem;
  border-radius: 5px;
  background: var(--sidebar-bg);
}

.project-file-list .file-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.project-file-list .file-status {
  color: var(--muted);
  font-size: 0.7rem;
  flex-shrink: 0;
}

.project-file-list button,
.attachment-list button,
.share-list button {
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.85rem;
  padding: 0 0.2rem;
  flex-shrink: 0;
}

.file-upload-label {
  display: block;
  text-align: center;
  padding: 0.4rem;
  border: 1px dashed var(--border);
  border-radius: 6px;
  font-size: 0.8rem;
  color: var(--muted);
  cursor: pointer;
}

.upload-status {
  margin: 0;
  font-size: 0.75rem;
  color: var(--muted);
}

/* --- Per-conversation attachments (build spec §10) ---------------------- */

.attachment-bar {
  padding: 0.4rem 1rem 0;
}

.attachment-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.attachment-list li {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  background: var(--sidebar-bg);
  border: 1px solid var(--border);
  font-size: 0.78rem;
}

.attachment-list .attachment-status-failed {
  color: #b91c1c;
}

.attachment-upload-label {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 0.5rem;
  cursor: pointer;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
}

/* --- Share dialog (build spec §10) -------------------------------------- */

.share-dialog {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--fg);
  padding: 1rem;
  width: min(22rem, 90vw);
}

.share-dialog::backdrop {
  background: rgba(0, 0, 0, 0.4);
}

.share-dialog h2 {
  margin: 0 0 0.25rem;
  font-size: 1rem;
}

.share-dialog-subtitle {
  margin: 0 0 0.75rem;
  color: var(--muted);
  font-size: 0.8rem;
}

.share-list {
  list-style: none;
  margin: 0 0 0.75rem;
  padding: 0;
  max-height: 10rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.share-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.4rem;
  padding: 0.25rem 0.4rem;
  border-radius: 5px;
  background: var(--sidebar-bg);
  font-size: 0.85rem;
}

.share-add-row {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.share-add-row select {
  flex: 1;
  min-width: 0;
  padding: 0.35rem 0.4rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--fg);
}

.share-add-row button,
.share-dialog-actions button {
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
}

.share-dialog-actions {
  display: flex;
  justify-content: flex-end;
}

/* --- Admin metrics (guard-local metrics scope doc §3 step 5) ----------- */

.admin-metrics {
  border-top: 1px solid var(--border);
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.85rem;
}

.admin-metrics-tabs {
  display: flex;
  gap: 0.4rem;
}

.admin-metrics-tab {
  padding: 0.3rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--muted);
  cursor: pointer;
}

.admin-metrics-tab.active {
  color: var(--fg);
  font-weight: 600;
}

.admin-metrics-dl {
  margin: 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.15rem 0.5rem;
}

.admin-metrics-dl dt {
  color: var(--muted);
}

.admin-metrics-dl dd {
  margin: 0;
}

.admin-metrics-dl dd.admin-metrics-backup-error {
  color: var(--danger);
}

.admin-metrics-empty,
.admin-metrics-note {
  color: var(--muted);
  margin: 0;
}

.admin-metrics-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}

.admin-metrics-table th,
.admin-metrics-table td {
  text-align: left;
  padding: 0.2rem 0.3rem;
  border-bottom: 1px solid var(--border);
}

.escrow-panel {
  border-top: 1px solid var(--border);
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.85rem;
}

/* `display: flex` above (and on .escrow-reenroll-banner) outranks the
   UA stylesheet's [hidden] rule, so without this the owner-only panels and
   the banners render for every session regardless of `hidden`. */
.escrow-panel[hidden],
.escrow-reenroll-banner[hidden],
.admin-metrics[hidden],
.chat-layout[hidden],
.projects-section[hidden],
.attachment-upload-label[hidden] {
  display: none;
}

.escrow-file-label {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.8rem;
  color: var(--muted);
}

.escrow-reenroll-banner {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 1rem;
  background: #78350f;
  color: #fef3c7;
  font-size: 0.85rem;
}

.escrow-reenroll-banner span {
  flex: 1;
}

.escrow-reenroll-banner button {
  flex-shrink: 0;
}

.escrow-reenroll-help {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0;
}

/* False-refusal reporting (app.js's showSendFailure / renderAdminMetricsSafety). */
.refusal-report {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  margin-top: 0.4rem;
}

.refusal-report-button {
  padding: 0.3rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
}

.refusal-report-button:disabled {
  color: var(--muted);
  cursor: default;
}

.admin-metrics-safety-window-heading {
  margin: 0.5rem 0 0.2rem;
  font-size: 0.85rem;
}