/* ==========================================================================
   Document Chatbot — static frontend styles (M1)
   No build step, no external assets. Light theme with a single accent color.
   ========================================================================== */

:root {
  --bg: #f4f6fb;
  --bg-accent: #eef2ff;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --surface-3: #f1f5f9;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --text: #0f172a;
  --muted: #64748b;
  --accent: #4f46e5;
  --accent-strong: #4338ca;
  --accent-soft: #eef2ff;
  --accent-border: #c7d2fe;
  --accent-disabled: #a5b4fc;
  --danger: #b91c1c;
  --danger-soft: #fef2f2;
  --danger-border: #fecaca;
  --warning: #92400e;
  --warning-soft: #fffbeb;
  --warning-border: #fde68a;
  --success: #15803d;
  --success-soft: #f0fdf4;
  --success-border: #bbf7d0;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 10px 30px rgba(15, 23, 42, 0.06);
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  --focus: 0 0 0 3px rgba(79, 70, 229, 0.22);
  color-scheme: light;
}

/* Dark palette. Toggled by setting data-theme="dark" on <html>. */
:root[data-theme="dark"] {
  --bg: #0b1120;
  --bg-accent: #111a2e;
  --surface: #111827;
  --surface-2: #0f172a;
  --surface-3: #1e293b;
  --border: #24324a;
  --border-strong: #334155;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #6366f1;
  --accent-strong: #a5b4fc;
  --accent-soft: rgba(99, 102, 241, 0.16);
  --accent-border: rgba(129, 140, 248, 0.4);
  --accent-disabled: #3730a3;
  --danger: #fca5a5;
  --danger-soft: rgba(248, 113, 113, 0.12);
  --danger-border: rgba(248, 113, 113, 0.36);
  --warning: #fcd34d;
  --warning-soft: rgba(251, 191, 36, 0.12);
  --warning-border: rgba(251, 191, 36, 0.36);
  --success: #86efac;
  --success-soft: rgba(74, 222, 128, 0.12);
  --success-border: rgba(74, 222, 128, 0.36);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 10px 30px rgba(0, 0, 0, 0.35);
  --focus: 0 0 0 3px rgba(99, 102, 241, 0.38);
  color-scheme: dark;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

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

body {
  background:
    radial-gradient(1100px 500px at 10% -10%, #e6ecff 0%, transparent 60%),
    radial-gradient(900px 500px at 100% 0%, #eef2ff 0%, transparent 55%),
    var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

:root[data-theme="dark"] body {
  background:
    radial-gradient(1100px 500px at 10% -10%, rgba(79, 70, 229, 0.2) 0%, transparent 60%),
    radial-gradient(900px 500px at 100% 0%, rgba(139, 92, 246, 0.14) 0%, transparent 55%),
    var(--bg);
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1 {
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1rem;
  letter-spacing: -0.01em;
}

button,
input,
textarea {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
}

:focus-visible {
  outline: none;
  box-shadow: var(--focus);
}

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

.small {
  font-size: 0.8125rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------------------------------------------------------------- layout */

.app {
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding: 20px 24px 24px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 6px 4px 18px;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-toggle {
  border-color: var(--border);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.github-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  height: 32px;
  padding: 0 11px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
  transition: color 140ms ease, background 140ms ease, border-color 140ms ease;
}

.github-link svg {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
}

.github-link:hover {
  border-color: var(--border-strong);
  background: var(--surface-2);
  color: var(--text);
}

.github-link:focus-visible {
  outline: none;
  box-shadow: var(--focus);
}

.site-back {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 32px;
  padding: 0 11px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
  transition: color 140ms ease, background 140ms ease, border-color 140ms ease;
}

.site-back:hover {
  border-color: var(--border-strong);
  background: var(--surface-2);
  color: var(--text);
}

.site-back:focus-visible {
  outline: none;
  box-shadow: var(--focus);
}

.theme-icon {
  width: 17px;
  height: 17px;
}

.theme-icon--sun {
  display: none;
}

:root[data-theme="dark"] .theme-icon--moon {
  display: none;
}

:root[data-theme="dark"] .theme-icon--sun {
  display: block;
}

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

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(145deg, var(--accent), #7c3aed);
  color: #fff;
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  box-shadow: 0 6px 16px rgba(79, 70, 229, 0.28);
}

.brand-copy p {
  color: var(--muted);
  font-size: 0.8125rem;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  max-width: 320px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  box-shadow: var(--shadow-sm);
}

.pill::before {
  content: "";
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border-strong);
}

.pill--pending::before {
  background: #f59e0b;
  animation: pulse 1.4s ease-in-out infinite;
}

.pill--ok {
  border-color: var(--success-border);
  background: var(--success-soft);
  color: var(--success);
}

.pill--ok::before {
  background: var(--success);
}

.pill--mock {
  border-color: var(--accent-border);
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.pill--mock::before {
  background: var(--accent);
}

.pill--error {
  border-color: var(--danger-border);
  background: var(--danger-soft);
  color: var(--danger);
}

.pill--error::before {
  background: var(--danger);
}

.workspace {
  display: grid;
  grid-template-columns: 360px minmax(0, 1fr);
  gap: 18px;
  height: calc(100dvh - 132px);
  min-height: 560px;
}

/* --------------------------------------------------------------- sidebar */

.sidebar {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 16px;
  min-height: 0;
}

.panel {
  min-height: 0;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.panel--docs {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.panel-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
}

.count-badge {
  display: inline-grid;
  place-items: center;
  min-width: 24px;
  height: 24px;
  padding: 0 7px;
  border-radius: 999px;
  background: var(--surface-3);
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
}

/* ---------------------------------------------------------------- upload */

.dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 20px 14px;
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  color: var(--muted);
  text-align: center;
  transition: border-color 160ms ease, background 160ms ease, transform 160ms ease;
}

.dropzone:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.dropzone.is-dragover {
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: scale(1.01);
}

.dropzone p {
  font-size: 0.8125rem;
}

.dropzone strong {
  color: var(--text);
}

.dropzone-icon {
  width: 28px;
  height: 28px;
  margin-bottom: 4px;
  color: var(--accent);
}

.link-text {
  color: var(--accent);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.upload-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 10px;
}

/* --------------------------------------------------------------- buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 38px;
  padding: 8px 14px;
  border: 1px solid transparent;
  border-radius: 10px;
  font-size: 0.84rem;
  font-weight: 650;
  transition: background 140ms ease, border-color 140ms ease, color 140ms ease,
    transform 80ms ease, box-shadow 140ms ease;
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
}

.btn--primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.24);
}

.btn--primary:hover:not(:disabled) {
  background: var(--accent-strong);
}

.btn--primary:disabled {
  background: var(--accent-disabled);
  box-shadow: none;
}

.btn--secondary {
  border-color: var(--accent-border);
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.btn--secondary:hover:not(:disabled) {
  border-color: var(--accent);
}

.btn--ghost {
  border-color: var(--border);
  background: transparent;
  color: var(--muted);
}

.btn--ghost:hover:not(:disabled) {
  border-color: var(--border-strong);
  background: var(--surface-2);
  color: var(--text);
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: 1px solid transparent;
  border-radius: 9px;
  background: transparent;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1;
  transition: background 140ms ease, color 140ms ease, border-color 140ms ease;
}

.icon-btn svg {
  width: 17px;
  height: 17px;
}

.icon-btn:hover:not(:disabled) {
  background: var(--surface-3);
  color: var(--text);
}

.icon-btn:disabled {
  opacity: 0.45;
}

/* ------------------------------------------------------------- progress */

.progress {
  margin-top: 12px;
}

.progress-head {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.78rem;
}

.progress-track {
  height: 7px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--surface-3);
}

.progress-bar {
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), #8b5cf6);
  transition: width 220ms ease;
}

.feedback {
  display: grid;
  gap: 6px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.feedback li {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 11px;
  border: 1px solid var(--danger-border);
  border-radius: 9px;
  background: var(--danger-soft);
  color: var(--danger);
  font-size: 0.78rem;
  overflow-wrap: anywhere;
}

.feedback li.is-warning {
  border-color: var(--warning-border);
  background: var(--warning-soft);
  color: var(--warning);
}

.feedback li strong {
  display: block;
  font-weight: 700;
}

.feedback-dismiss {
  flex: 0 0 auto;
  border: 0;
  background: transparent;
  color: inherit;
  font-size: 1rem;
  line-height: 1;
  opacity: 0.7;
}

/* ------------------------------------------------------------ doc library */

.doc-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.checkbox {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
  font-size: 0.82rem;
  font-weight: 600;
  user-select: none;
}

.checkbox input {
  width: 16px;
  height: 16px;
  margin: 0;
  accent-color: var(--accent);
}

.doc-list {
  flex: 1;
  min-height: 0;
  margin: 4px -4px 0 0;
  padding-right: 4px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}

.doc-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 10px 6px;
  border-bottom: 1px solid var(--border);
}

.doc-row:last-of-type {
  border-bottom: 0;
}

.doc-row:hover {
  background: var(--surface-2);
}

.doc-row.is-deleting {
  opacity: 0.5;
  pointer-events: none;
}

.doc-check {
  width: 16px;
  height: 16px;
  margin: 0;
  accent-color: var(--accent);
}

.doc-main {
  min-width: 0;
}

.doc-title-row {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.doc-name {
  min-width: 0;
  overflow: hidden;
  color: var(--text);
  font-size: 0.84rem;
  font-weight: 650;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.doc-meta {
  margin-top: 2px;
  color: var(--muted);
  font-size: 0.73rem;
  white-space: nowrap;
}

.type-badge {
  flex: 0 0 auto;
  padding: 2px 6px;
  border-radius: 5px;
  background: var(--surface-3);
  color: var(--muted);
  font-size: 0.63rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.type-badge--pdf {
  background: #eff6ff;
  color: #1d4ed8;
}

.type-badge--txt {
  background: #f0fdf4;
  color: #15803d;
}

.type-badge--markdown {
  background: #fffbeb;
  color: #b45309;
}

.type-badge--docx {
  background: #faf5ff;
  color: #7e22ce;
}

.type-badge--text {
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.icon-btn--danger:hover:not(:disabled) {
  background: var(--danger-soft);
  color: var(--danger);
}

.empty-note {
  padding: 24px 8px;
  color: var(--muted);
  font-size: 0.82rem;
  text-align: center;
}

.empty-note strong {
  display: block;
  margin-bottom: 3px;
  color: var(--text);
}

/* ------------------------------------------------------------------ chat */

.chat {
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.chat-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, var(--surface), var(--surface-2));
}

.chat-head h2 {
  font-size: 1.05rem;
}

.chat-head p {
  margin-top: 2px;
}

.chat-log {
  flex: 1;
  min-height: 0;
  padding: 20px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
  scroll-behavior: smooth;
}

.chat-empty {
  display: grid;
  place-items: center;
  min-height: 100%;
  padding: 24px;
  text-align: center;
}

.chat-empty-inner {
  max-width: 430px;
}

.chat-empty-icon {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  margin: 0 auto 14px;
  border: 1px solid var(--accent-border);
  border-radius: 16px;
  background: var(--accent-soft);
  color: var(--accent);
}

.chat-empty-icon svg {
  width: 26px;
  height: 26px;
}

.chat-empty h3 {
  margin-bottom: 6px;
  font-size: 1.05rem;
}

.chat-empty p {
  color: var(--muted);
  font-size: 0.85rem;
}

.example-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 16px;
}

.example-btn {
  padding: 7px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 0.78rem;
  transition: border-color 140ms ease, color 140ms ease, background 140ms ease;
}

.example-btn:hover {
  border-color: var(--accent-border);
  background: var(--accent-soft);
  color: var(--accent-strong);
}

/* -------------------------------------------------------------- messages */

.message {
  display: flex;
  gap: 10px;
  max-width: 780px;
  margin-bottom: 18px;
  animation: fade-up 180ms ease-out both;
}

.message--user {
  flex-direction: row-reverse;
  margin-left: auto;
}

.avatar {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 30px;
  height: 30px;
  border-radius: 9px;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.03em;
}

.message--assistant .avatar {
  border: 1px solid var(--accent-border);
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.message--user .avatar {
  background: var(--text);
  color: var(--surface);
}

.message-body {
  min-width: 0;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface-2);
}

.message--user .message-body {
  border-color: var(--accent-border);
  background: var(--accent-soft);
}

.message--error .message-body {
  border-color: var(--danger-border);
  background: var(--danger-soft);
}

.message-text {
  font-size: 0.9rem;
  line-height: 1.6;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

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

.message-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.72rem;
}

.error-code {
  padding: 2px 6px;
  border-radius: 5px;
  background: var(--surface);
  color: var(--danger);
  font-family: var(--mono);
  font-size: 0.66rem;
  font-weight: 700;
}

.retry-btn {
  margin-top: 10px;
  padding: 6px 11px;
  border: 1px solid var(--danger-border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--danger);
  font-size: 0.78rem;
  font-weight: 650;
}

.retry-btn:hover {
  background: var(--danger-soft);
}

.typing {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 0;
}

.typing span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.35;
  animation: typing 1.1s ease-in-out infinite;
}

.typing span:nth-child(2) {
  animation-delay: 140ms;
}

.typing span:nth-child(3) {
  animation-delay: 280ms;
}

.typing-label {
  margin-left: 4px;
  color: var(--muted);
  font-size: 0.78rem;
}

/* --------------------------------------------------------------- sources */

.sources {
  margin-top: 12px;
  border-top: 1px solid var(--border);
}

.sources summary {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 9px 0 4px;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 650;
  cursor: pointer;
  user-select: none;
}

.sources summary:hover {
  color: var(--accent-strong);
}

.source-list {
  display: grid;
  gap: 8px;
  margin: 6px 0 0;
  padding: 0;
  list-style: none;
}

.source {
  padding: 9px 11px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--surface);
}

.source-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.source-file {
  min-width: 0;
  overflow: hidden;
  font-size: 0.78rem;
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.source-score {
  flex: 0 0 auto;
  color: var(--success);
  font-size: 0.68rem;
  font-weight: 700;
}

.source-meta {
  margin-top: 1px;
  color: var(--muted);
  font-size: 0.68rem;
}

.source-snippet {
  margin-top: 5px;
  color: var(--muted);
  font-size: 0.74rem;
  line-height: 1.5;
  overflow-wrap: anywhere;
}

/* -------------------------------------------------------------- composer */

.composer {
  padding: 14px 20px 16px;
  border-top: 1px solid var(--border);
  background: var(--surface-2);
}

.composer-form {
  padding: 8px;
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  background: var(--surface);
  transition: border-color 140ms ease, box-shadow 140ms ease;
}

.composer-form:focus-within {
  border-color: var(--accent);
  box-shadow: var(--focus);
}

#question {
  display: block;
  width: 100%;
  min-height: 24px;
  max-height: 160px;
  padding: 4px 6px;
  border: 0;
  outline: none;
  background: transparent;
  resize: none;
  font-size: 0.92rem;
  line-height: 1.5;
  scrollbar-width: thin;
}

#question::placeholder {
  color: var(--muted);
}

.composer-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 4px 4px 0;
}

.composer-hint {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.composer-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.select-field {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.select-field select,
.select-field input[type="number"] {
  height: 28px;
  padding: 0 6px;
  border: 1px solid var(--border-strong);
  border-radius: 7px;
  background: var(--surface);
  color: var(--text);
  font-size: 0.78rem;
  font-weight: 600;
  outline: none;
  transition: border-color 140ms ease, box-shadow 140ms ease;
}

.select-field select {
  cursor: pointer;
}

.select-field input[type="number"] {
  width: 58px;
  padding-right: 2px;
  text-align: center;
  cursor: text;
}

.select-field select:focus,
.select-field input[type="number"]:focus {
  border-color: var(--accent);
  box-shadow: var(--focus);
}

.composer-note {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.7rem;
  text-align: center;
}

/* ---------------------------------------------------------------- dialog */

.dialog {
  width: min(620px, calc(100vw - 32px));
  max-height: calc(100dvh - 48px);
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 24px 70px rgba(15, 23, 42, 0.24);
}

.dialog::backdrop {
  background: rgba(15, 23, 42, 0.42);
  backdrop-filter: blur(2px);
}

.dialog-form {
  display: grid;
  gap: 14px;
  padding: 20px;
}

.dialog-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.dialog-head h2 {
  font-size: 1.05rem;
}

.dialog-head p {
  margin-top: 3px;
}

.field {
  display: grid;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 650;
}

.field input,
.field textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  background: var(--surface-2);
  font-size: 0.9rem;
  font-weight: 400;
  outline: none;
  transition: border-color 140ms ease, box-shadow 140ms ease;
}

.field input:focus,
.field textarea:focus {
  border-color: var(--accent);
  box-shadow: var(--focus);
}

.field textarea {
  min-height: 180px;
  resize: vertical;
  line-height: 1.55;
}

.dialog-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.form-error {
  color: var(--danger);
  font-size: 0.78rem;
  text-align: right;
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding-top: 2px;
}

/* ------------------------------------------------------- banner / toast */

.banner {
  position: fixed;
  top: 18px;
  left: 50%;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 14px;
  width: min(680px, calc(100vw - 32px));
  padding: 11px 14px;
  border: 1px solid var(--danger-border);
  border-radius: 11px;
  background: var(--danger-soft);
  color: var(--danger);
  font-size: 0.82rem;
  box-shadow: var(--shadow);
  transform: translateX(-50%);
  animation: fade-down 180ms ease-out both;
}

.banner-close {
  margin-left: auto;
  border: 0;
  background: transparent;
  color: inherit;
  font-size: 1.15rem;
  line-height: 1;
  opacity: 0.7;
}

.toast {
  position: fixed;
  bottom: 22px;
  left: 50%;
  z-index: 50;
  max-width: calc(100vw - 32px);
  padding: 9px 15px;
  border: 1px solid var(--success-border);
  border-radius: 999px;
  background: var(--success-soft);
  color: var(--success);
  font-size: 0.8rem;
  font-weight: 650;
  box-shadow: var(--shadow);
  transform: translateX(-50%);
  animation: fade-up 180ms ease-out both;
}

/* ------------------------------------------------------------- animations */

@keyframes typing {
  0%, 60%, 100% { opacity: 0.3; transform: translateY(0); }
  30% { opacity: 1; transform: translateY(-2px); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.45; }
}

@keyframes fade-up {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fade-down {
  from { opacity: 0; transform: translate(-50%, -6px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

/* ------------------------------------------------------------- responsive */

@media (max-width: 1020px) {
  .app {
    padding: 16px;
  }

  .workspace {
    grid-template-columns: 1fr;
    height: auto;
    min-height: 0;
  }

  .sidebar {
    grid-template-rows: auto auto;
  }

  .doc-list {
    max-height: 260px;
  }

  .chat {
    min-height: 70vh;
  }

  .chat-log {
    min-height: 46vh;
  }
}

@media (max-width: 640px) {
  .app {
    padding: 12px;
  }

  .topbar {
    padding-bottom: 12px;
  }

  .brand-copy p {
    display: none;
  }

  .pill {
    max-width: 200px;
  }

  .github-link {
    width: 32px;
    padding: 0;
  }

  .github-link span {
    display: none;
  }

  .site-back {
    width: 32px;
    padding: 0;
  }

  .site-back span:last-child {
    display: none;
  }

  .chat-head {
    padding: 12px 14px;
  }

  .chat-head h2 {
    font-size: 0.95rem;
  }

  .chat-log {
    padding: 14px;
  }

  .composer {
    padding: 10px 12px 12px;
  }

  .composer-hint {
    display: none;
  }

  .composer-note {
    display: none;
  }

  .message {
    max-width: 100%;
  }

  .dialog-form {
    padding: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ------------------------------------------------------- dark adjustments */

:root[data-theme="dark"] .type-badge--pdf {
  background: rgba(59, 130, 246, 0.16);
  color: #93c5fd;
}

:root[data-theme="dark"] .type-badge--txt {
  background: rgba(34, 197, 94, 0.16);
  color: #86efac;
}

:root[data-theme="dark"] .type-badge--markdown {
  background: rgba(245, 158, 11, 0.16);
  color: #fcd34d;
}

:root[data-theme="dark"] .type-badge--docx {
  background: rgba(168, 85, 247, 0.16);
  color: #d8b4fe;
}

:root[data-theme="dark"] .dialog {
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.6);
}

/* ---------------------------------------------------------------- markdown */

.message-text {

.message-text {
  white-space: pre-wrap; /* preserve line breaks for code blocks */
}

.message-text h1,
.message-text h2,
.message-text h3,
.message-text h4 {
  margin: 14px 0 6px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text);
}

.message-text h1 { font-size: 1.35rem; }
.message-text h2 { font-size: 1.2rem; }
.message-text h3 { font-size: 1.1rem; }
.message-text h4 { font-size: 1rem; }

.message-text p {
  margin: 0 0 10px;
  line-height: 1.6;
}

.message-text ul,
.message-text ol {
  margin: 0 0 10px 22px;
  padding: 0;
  line-height: 1.6;
}

.message-text li {
  margin-bottom: 4px;
}

.message-text li > p {
  margin: 0 0 4px;
}

.message-text blockquote {
  margin: 0 0 10px 0;
  padding: 8px 12px;
  border-left: 3px solid var(--accent);
  background: var(--surface-3);
  color: var(--muted);
  border-radius: 0 6px 6px 0;
}

.message-text code {
  font-family: var(--mono);
  font-size: 0.87em;
  background: var(--surface-3);
  padding: 1px 4px;
  border-radius: 4px;
  color: var(--text);
}

.message-text pre {
  font-family: var(--mono);
  font-size: 0.84rem;
  background: var(--surface-3);
  padding: 10px 12px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 10px 0;
  line-height: 1.5;
}

.message-text pre code {
  background: transparent;
  padding: 0;
  font-size: inherit;
  color: inherit;
}

.message-text table {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0;
  font-size: 0.85rem;
  overflow-x: auto;
  display: block;
}

.message-text th,
.message-text td {
  border: 1px solid var(--border);
  padding: 6px 10px;
  text-align: left;
}

.message-text th {
  background: var(--surface-3);
  font-weight: 700;
  color: var(--text);
}

.message-text tr:nth-child(even) {
  background: var(--surface-2);
}

.message-text hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 16px 0;
}

.message-text a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.message-text a:hover {
  text-decoration-thickness: 2px;
}

/* Ensure message-text inside dark theme uses proper contrast */
:root[data-theme="dark"] .message-text blockquote {
  background: var(--surface-3);
  color: var(--muted);
}

/* ------------------------------------------------------------- confirm dialog */

.confirm-dialog {
  width: min(460px, calc(100vw - 32px));
}

.confirm-dialog .dialog-head h2 {
  margin: 0;
  font-size: 1.05rem;
}

.confirm-dialog .dialog-head p {
  margin: 4px 0 0;
}

.confirm-dialog .dialog-actions {
  justify-content: flex-end;
  gap: 8px;
  padding-top: 0;
}

.btn--danger {
  background: var(--danger);
  color: #fff;
  box-shadow: 0 4px 12px rgba(185, 28, 28, 0.24);
}

.btn--danger:hover:not(:disabled) {
  background: #991b1b;
}

.btn--danger:disabled {
  background: var(--accent-disabled);
  box-shadow: none;
}

/* ------------------------------------------------------------------- spinner */

.spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 20px;
  margin-top: 10px;
}

.spinner-ring {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-strong);
  border-top-color: var(--accent-strong);
  border-radius: 50%;
  display: inline-block;
  animation: spin 0.8s linear infinite;
  will-change: transform;
}

.spinner-text {
  font-size: 0.85rem;
  color: var(--muted);
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ------------------------------------------------------------------- fullscreen */

body.chat-fullscreen-body {
  overflow: hidden;
  margin: 0;
}

.chat--fullscreen {
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  right: 0 !important;
  bottom: 0 !important;
  z-index: 100 !important;
  width: 100vw !important;
  height: 100vh !important;
  max-width: none !important;
  max-height: none !important;
  border: none !important;
  border-radius: 0 !important;
  box-shadow: none !important;
  background: var(--surface) !important;
  display: flex !important;
  flex-direction: column !important;
}

.chat--fullscreen .workspace {
  grid-template-columns: 1fr !important;
  height: 100vh !important;
  gap: 0 !important;
  display: grid !important;
}

.chat--fullscreen .sidebar {
  display: none !important;
}

.chat--fullscreen .chat-head {
  padding: 12px 16px !important;
  background: var(--surface) !important;
  flex-shrink: 0 !important;
}

.chat--fullscreen .chat-log {
  padding: 20px !important;
  height: auto !important;
  flex: 1 !important;
  overflow-y: auto !important;
  display: block !important;
}

.chat--fullscreen .composer {
  padding: 12px 16px !important;
  background: var(--surface-2) !important;
  flex-shrink: 0 !important;
}

.chat--fullscreen .message {
  max-width: 90vw !important;
}

.chat--fullscreen .doc-row {
  max-width: none !important;
}

#toggle-fullscreen {
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  min-width: 36px !important;
  min-height: 36px !important;
  padding: 6px !important;
}

#toggle-fullscreen svg {
  width: 20px !important;
  height: 20px !important;
  stroke-width: 2 !important;
  pointer-events: none !important;
}

.chat-head #toggle-fullscreen {
  margin-left: 8px !important;
}