/* CMScope hosted UI styles.
 *
 * Design posture: Apple HIG-adjacent restraint, Vercel Geist-toned.
 * See docs/ui-rebuild-spec.md §"Design language".
 *
 * Color tokens at :root, with a prefers-color-scheme: dark mirror (no
 * in-app toggle in v1).
 */

:root {
  /* Surface scale — near-white to slightly darker, never pure white. */
  --surface-0: #fafaf9;
  --surface-1: #f5f5f4;
  --surface-2: #ffffff;
  --surface-3: #f0efee;

  /* Ink scale — primary text through tertiary. */
  --ink: #1c1917;
  --ink-muted: #57534e;
  --ink-soft: #78716c;

  /* Accent — single restrained color, used sparingly. */
  --accent: #1f6feb;
  --accent-soft: rgba(31, 111, 235, 0.08);

  /* Status palette — verified/partial/unverified/out-of-scope.
   * Subdued, not loud. The hue shift is the signal, not the saturation. */
  --verified: #2f7d4f;
  --verified-soft: rgba(47, 125, 79, 0.10);
  --partial: #b07b1a;
  --partial-soft: rgba(176, 123, 26, 0.10);
  --unverified: #b13a3a;
  --unverified-soft: rgba(177, 58, 58, 0.10);
  --out-of-scope: #6b7280;
  --out-of-scope-soft: rgba(107, 114, 128, 0.10);

  /* Borders + shadows — hairline, not heavy. */
  --border: #e7e5e4;
  --border-strong: #d6d3d1;

  /* Typography. */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Helvetica Neue", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Menlo", "Consolas", monospace;

  /* Geometry — sidebar 260px, canvas 760px, gentle radii. */
  --sidebar-width: 260px;
  --canvas-max: 760px;
  --radius-pill: 999px;
  --radius-card: 12px;
  --radius-bubble: 12px;
  --radius-input: 16px;

  /* Spacing rhythm. */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --surface-0: #0f0f0e;
    --surface-1: #1a1a18;
    --surface-2: #1f1f1d;
    --surface-3: #272623;
    --ink: #f5f5f4;
    --ink-muted: #a8a29e;
    --ink-soft: #78716c;
    --accent: #4a8cff;
    --accent-soft: rgba(74, 140, 255, 0.12);
    --verified: #5fae7a;
    --verified-soft: rgba(95, 174, 122, 0.12);
    --partial: #d4a04a;
    --partial-soft: rgba(212, 160, 74, 0.12);
    --unverified: #e57373;
    --unverified-soft: rgba(229, 115, 115, 0.12);
    --out-of-scope: #9ca3af;
    --out-of-scope-soft: rgba(156, 163, 175, 0.12);
    --border: #2d2c2a;
    --border-strong: #3f3d3a;
  }
}

/* Reset + base. */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.55;
  background: var(--surface-0);
  color: var(--ink);
  font-feature-settings: "cv11", "ss01", "ss03";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  height: 100vh;
  overflow: hidden;
}

button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

/* ─── Sidebar ─────────────────────────────────────────────────────────── */

.sidebar {
  background: var(--surface-1);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow-y: auto;
  padding: var(--space-5) var(--space-4);
  gap: var(--space-5);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--ink);
  font-weight: 600;
  font-size: 16px;
  letter-spacing: -0.01em;
  text-decoration: none;
}
.sidebar-brand:hover {
  text-decoration: none;
}

.sidebar-brand-mark {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--accent) 0%, #0f4cb0 100%);
  position: relative;
}
.sidebar-brand-mark::after {
  content: "";
  position: absolute;
  inset: 5px;
  border-radius: 3px;
  border: 2px solid var(--surface-2);
}

.sidebar-new {
  width: 100%;
  text-align: left;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  padding: var(--space-3) var(--space-4);
  font-weight: 500;
  cursor: pointer;
  color: var(--ink);
  transition: background 120ms ease, border-color 120ms ease;
}
.sidebar-new:hover {
  background: var(--surface-3);
  border-color: var(--border-strong);
}
.sidebar-new:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.sidebar-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.sidebar-heading {
  margin: 0;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  padding: 0 var(--space-2);
}

.sidebar-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar-account {
  margin-top: auto;
  border-top: 1px solid var(--border);
  padding-top: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.sidebar-account-name {
  font-weight: 600;
  font-size: 14px;
  padding: 0 var(--space-2);
}

.sidebar-account-jurisdiction {
  font-size: 12px;
  color: var(--ink-soft);
  padding: 0 var(--space-2);
}

.sidebar-logout-form {
  margin: var(--space-2) 0 0 0;
}

.sidebar-logout {
  background: none;
  border: none;
  padding: var(--space-2);
  font-size: 13px;
  color: var(--ink-muted);
  cursor: pointer;
  text-align: left;
  width: 100%;
  border-radius: 6px;
}
.sidebar-logout:hover {
  background: var(--surface-3);
  color: var(--ink);
}

/* ─── Canvas ──────────────────────────────────────────────────────────── */

.canvas {
  display: grid;
  grid-template-rows: auto 1fr auto;
  height: 100vh;
  overflow: hidden;
  position: relative;
}

.canvas-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-8);
  border-bottom: 1px solid var(--border);
  background: var(--surface-0);
  position: sticky;
  top: 0;
  z-index: 2;
}

.canvas-title-button {
  background: none;
  border: none;
  padding: var(--space-1) var(--space-2);
  margin-left: calc(-1 * var(--space-2));
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  cursor: pointer;
  border-radius: 6px;
  text-align: left;
  max-width: 70%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.canvas-title-button:hover {
  background: var(--surface-3);
}

.canvas-title-jurisdiction {
  font-size: 12px;
  color: var(--ink-soft);
}

.canvas-thread {
  overflow-y: auto;
  padding: var(--space-8) var(--space-8) var(--space-6);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.canvas-thread-inner {
  width: 100%;
  max-width: var(--canvas-max);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.canvas-empty {
  width: 100%;
  max-width: var(--canvas-max);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding-top: 10vh;
}

.canvas-greeting {
  font-size: 32px;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0 0 var(--space-3) 0;
  color: var(--ink);
}

.canvas-empty-sub {
  font-size: 15px;
  color: var(--ink-muted);
  margin: 0;
  max-width: 480px;
}

/* ─── Conversation: user bubble, assistant bubble, status badge ──────── */

.bubble {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-width: 100%;
}

.bubble-user {
  align-self: flex-end;
  background: var(--accent-soft);
  color: var(--ink);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-bubble);
  border-bottom-right-radius: 4px;
  max-width: 85%;
  white-space: pre-wrap;
  word-break: break-word;
}

.bubble-assistant {
  align-self: stretch;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-bubble);
  border-top-left-radius: 4px;
  padding: var(--space-4) var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  transition: border-color 120ms ease, transform 120ms ease;
}
.bubble-assistant:hover {
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.bubble-assistant-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  font-size: 12px;
  color: var(--ink-soft);
}

.bubble-stage-pills {
  display: flex;
  gap: var(--space-1);
  flex-wrap: wrap;
}

.stage-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px var(--space-2);
  border-radius: var(--radius-pill);
  background: var(--surface-3);
  color: var(--ink-muted);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.01em;
}
.stage-pill.stage-active {
  background: var(--accent-soft);
  color: var(--accent);
  animation: pulse 1.6s ease-in-out infinite;
}
.stage-pill.stage-done {
  background: var(--surface-3);
  color: var(--ink-soft);
}
.stage-pill.stage-refining::after {
  content: " (refining)";
  color: var(--ink-soft);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.55; }
}

.bubble-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px var(--space-2);
  border-radius: var(--radius-pill);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.01em;
  margin-left: auto;
}
.bubble-status-badge::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.bubble-status-verified {
  background: var(--verified-soft);
  color: var(--verified);
}
.bubble-status-partial {
  background: var(--partial-soft);
  color: var(--partial);
}
.bubble-status-unverified {
  background: var(--unverified-soft);
  color: var(--unverified);
}
.bubble-status-out_of_scope,
.bubble-status-out-of-scope {
  background: var(--out-of-scope-soft);
  color: var(--out-of-scope);
}

.bubble-body {
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.6;
  color: var(--ink);
}

.bubble-body .citation-ref {
  display: inline;
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 1px 5px;
  border-radius: 4px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: border-color 120ms ease;
}
.bubble-body .citation-ref:hover {
  border-color: var(--accent);
}

.bubble-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 12px;
  color: var(--ink-soft);
}

.bubble-affordances {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-left: auto;
}

.affordance {
  background: none;
  border: 1px solid transparent;
  padding: 4px 8px;
  border-radius: 6px;
  color: var(--ink-muted);
  font-size: 12px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.affordance:hover {
  background: var(--surface-3);
  color: var(--ink);
}
.affordance.affordance-on {
  background: var(--accent-soft);
  color: var(--accent);
}
.affordance:disabled {
  opacity: 0.6;
  cursor: default;
}

/* ─── Citations panel ─────────────────────────────────────────────────── */

.citations-heading {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: var(--space-2) 0 var(--space-1) 0;
}

.citations-list {
  display: grid;
  gap: var(--space-2);
}

.citation-card {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: var(--space-3) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  transition: border-color 120ms ease, transform 120ms ease;
}
.citation-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.citation-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  font-size: 13px;
}

.citation-id {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--ink);
}

.citation-source {
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--surface-3);
  color: var(--ink-muted);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.citation-source-lcd {
  background: rgba(31, 111, 235, 0.10);
  color: #1f4e9d;
}
.citation-source-article {
  background: rgba(155, 89, 182, 0.10);
  color: #6b3a8a;
}
.citation-source-transmittal {
  background: rgba(176, 123, 26, 0.10);
  color: #8a5d0e;
}

.citation-section {
  font-size: 11px;
  color: var(--ink-soft);
  font-family: var(--font-mono);
}

.citation-title {
  margin: 0;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
}

.citation-snippet {
  margin: 0;
  padding: var(--space-2) var(--space-3);
  background: var(--surface-0);
  border-left: 2px solid var(--border-strong);
  font-size: 13px;
  color: var(--ink-muted);
  border-radius: 4px;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: var(--font-mono);
}

.citation-card-footer {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  font-size: 12px;
}

.citation-link {
  color: var(--accent);
  font-size: 12px;
}

.citation-inspect {
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px var(--space-2);
  font-size: 12px;
  color: var(--ink-muted);
  cursor: pointer;
}
.citation-inspect:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ─── Citation inspect panel ──────────────────────────────────────────── */

#citation-inspect {
  margin-top: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  background: var(--surface-1);
  font-size: 13px;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
#citation-inspect[hidden] {
  display: none;
}
#citation-inspect h3 {
  margin: 0;
  font-size: 13px;
  font-weight: 600;
}
.citation-meta {
  font-size: 12px;
  color: var(--ink-soft);
  margin: 0;
}
.citation-sections {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.citation-section-tab {
  text-align: left;
  font-size: 12px;
  padding: var(--space-1) var(--space-2);
  background: var(--surface-2);
  border: 1px solid var(--border);
  cursor: pointer;
  border-radius: 4px;
  font-family: var(--font-mono);
  color: var(--ink-muted);
}
.citation-section-tab:hover {
  background: var(--surface-3);
}
.citation-section-tab-active {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--accent);
}
.citation-inspect-region {
  margin-top: var(--space-2);
  padding: var(--space-3);
  background: var(--surface-0);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.citation-inspect-region[hidden] {
  display: none;
}
.citation-inspect-region h4 {
  margin: 0;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
}
.citation-inspect-loading {
  font-size: 12px;
  color: var(--ink-soft);
  margin: 0;
  font-style: italic;
}
.citation-record {
  font-size: 12px;
  color: var(--ink-muted);
}
.citation-record summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-soft);
  padding: var(--space-1) 0;
}
.citation-inspect-active {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--accent);
}
.transmittal-meta {
  margin: 0;
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: var(--space-1) var(--space-3);
  font-size: 13px;
}
.transmittal-meta dt {
  font-weight: 500;
  color: var(--ink-soft);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding-top: 2px;
}
.transmittal-meta dd {
  margin: 0;
  color: var(--ink);
  word-break: break-word;
}
.transmittal-meta dd a {
  font-size: 12px;
  font-family: var(--font-mono);
  word-break: break-all;
}
.citation-match-highlight {
  background: rgba(176, 123, 26, 0.18);
  color: inherit;
  border-radius: 2px;
  padding: 0;
  font-weight: 500;
}
.citation-section-body {
  font-size: 12px;
  background: var(--surface-0);
  padding: var(--space-2);
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 16rem;
  overflow: auto;
  margin: 0;
  border-radius: 4px;
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  color: var(--ink-muted);
}

/* ─── Composer ────────────────────────────────────────────────────────── */

.canvas-composer {
  position: sticky;
  bottom: 0;
  background: var(--surface-0);
  border-top: 1px solid var(--border);
  padding: var(--space-4) var(--space-8) var(--space-6);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.composer-jurisdiction-chip {
  font-size: 11px;
  color: var(--ink-soft);
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: 2px var(--space-2);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.composer-form {
  width: 100%;
  max-width: var(--canvas-max);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  padding: var(--space-2) var(--space-2) var(--space-2) var(--space-4);
  display: flex;
  align-items: flex-end;
  gap: var(--space-2);
  transition: border-color 120ms ease, box-shadow 120ms ease;
}
.composer-form:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.composer-textarea {
  flex: 1;
  resize: none;
  border: none;
  outline: none;
  background: transparent;
  font-family: inherit;
  font-size: 15px;
  line-height: 1.5;
  padding: var(--space-2) 0;
  color: var(--ink);
  max-height: 12rem;
  min-height: 1.5rem;
}
.composer-textarea::placeholder {
  color: var(--ink-soft);
}

.composer-send {
  flex: 0 0 auto;
  background: var(--accent);
  color: var(--surface-2);
  border: none;
  border-radius: var(--radius-pill);
  padding: var(--space-2) var(--space-4);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  min-width: 4.5rem;
  transition: background 120ms ease, opacity 120ms ease;
}
.composer-send:hover {
  background: #195fcc;
}
.composer-send:disabled {
  opacity: 0.5;
  cursor: default;
}
.composer-send.composer-stop {
  background: var(--unverified);
}
.composer-send.composer-stop:hover {
  background: #962f2f;
}

/* ─── Sidebar item variants ───────────────────────────────────────────── */

.recent-item {
  display: flex;
  flex-direction: column;
}

.recent-button {
  background: transparent;
  border: none;
  padding: var(--space-2) var(--space-3);
  border-radius: 8px;
  text-align: left;
  cursor: pointer;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-left: 2px solid transparent;
  transition: background 120ms ease, border-color 120ms ease;
}
.recent-button:hover {
  background: var(--surface-3);
}
.recent-status-verified .recent-button {
  border-left-color: var(--verified);
}
.recent-status-unverified .recent-button {
  border-left-color: var(--unverified);
}
.recent-status-partial .recent-button {
  border-left-color: var(--partial);
}
.recent-status-out_of_scope .recent-button,
.recent-status-out-of-scope .recent-button {
  border-left-color: var(--out-of-scope);
}

.recent-question {
  font-size: 13px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: block;
  color: var(--ink);
}

.recent-meta {
  font-size: 10px;
  color: var(--ink-soft);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.recent-empty {
  font-size: 12px;
  color: var(--ink-soft);
  font-style: italic;
  padding: var(--space-2) var(--space-3);
}

.catalog-button {
  background: transparent;
  border: none;
  padding: var(--space-2) var(--space-3);
  border-radius: 8px;
  text-align: left;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 2px;
  color: var(--ink);
  width: 100%;
  transition: background 120ms ease;
}
.catalog-button:hover {
  background: var(--surface-3);
}

.catalog-label {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.catalog-text {
  font-size: 13px;
  color: var(--ink);
}

/* ─── Login ───────────────────────────────────────────────────────────── */

body.login-body {
  display: flex;
  align-items: center;
  justify-content: center;
  grid-template-columns: none;
  overflow: auto;
}

.login {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: var(--space-8);
  width: 360px;
  max-width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.login h1 {
  margin: 0;
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.login form {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.login label {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  font-size: 12px;
  color: var(--ink-muted);
  font-weight: 500;
}
.login input {
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  background: var(--surface-0);
  color: var(--ink);
}
.login input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}
.login button {
  background: var(--accent);
  color: var(--surface-2);
  border: none;
  border-radius: 8px;
  padding: var(--space-2) var(--space-4);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
}
.login button:hover {
  background: #195fcc;
}
.login .error {
  color: var(--unverified);
  font-size: 13px;
  margin: 0;
}

/* ─── Error + utility ─────────────────────────────────────────────────── */

.error {
  color: var(--unverified);
  font-size: 13px;
}

/* ─── Narrow viewport: stack sidebar above canvas ──────────────────────── */

@media (max-width: 860px) {
  body {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
    height: 100vh;
  }
  .sidebar {
    height: auto;
    max-height: 40vh;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  .canvas {
    height: auto;
    min-height: 0;
  }
  .canvas-thread {
    padding: var(--space-5) var(--space-4);
  }
  .canvas-composer {
    padding: var(--space-3) var(--space-4);
  }
  .canvas-empty {
    padding-top: 4vh;
  }
  .canvas-greeting {
    font-size: 24px;
  }
}