:root {
  color-scheme: light;
  --hestia-canvas: #f4f2ec;
  --hestia-surface: #fbfaf6;
  --hestia-surface-muted: #e8e8e1;
  --hestia-text: #101612;
  --hestia-text-muted: #58615c;
  --hestia-line: rgba(12, 59, 46, .16);
  --hestia-line-strong: rgba(12, 59, 46, .34);
  --hestia-header: rgba(244, 242, 236, .94);
  --hestia-accent-1: #641b27;
  --hestia-accent-2: #8e2731;
  --hestia-accent-3: #bd3f3b;
  --hestia-accent-4: #e66d42;
  --hestia-accent-5: #ffd08a;
  --hestia-focus: #a52a32;

  /* Recovery application compatibility tokens. */
  --canvas: var(--hestia-canvas);
  --surface: var(--hestia-surface);
  --surface-soft: var(--hestia-surface-muted);
  --ink: var(--hestia-text);
  --muted: var(--hestia-text-muted);
  --primary: #7a2f38;
  --primary-dark: #641b27;
  --primary-soft: #f4e2de;
  --teal: #0b6b4f;
  --teal-soft: #e2eee8;
  --success: #326f57;
  --warning: #9b5b27;
  --danger: #9f3f32;
  --line: var(--hestia-line);
  --line-strong: var(--hestia-line-strong);
  --ochre: #9d562f;
  --shadow: 0 22px 60px rgba(16, 22, 18, .1);
  --sans: Manrope, Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;

  /* Agent Rooms compatibility tokens. */
  --paper: var(--hestia-canvas);
  --paper-strong: var(--hestia-surface);
  --forest: #163d35;
  --forest-deep: #0b211d;
  --sage: #b9c7b3;
  --ember: #ac4c2d;
  --garnet: #6e2733;
  --soft-line: rgba(12, 59, 46, .09);
  --serif: Marcellus, Georgia, serif;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --hestia-canvas: #050a08;
  --hestia-surface: #0b1410;
  --hestia-surface-muted: #111e18;
  --hestia-text: #f7f5ef;
  --hestia-text-muted: #adb5af;
  --hestia-line: rgba(191, 197, 192, .18);
  --hestia-line-strong: rgba(191, 197, 192, .4);
  --hestia-header: rgba(5, 10, 8, .94);
  --hestia-accent-1: #6d1b27;
  --hestia-accent-2: #a52a36;
  --hestia-accent-3: #dc4b40;
  --hestia-accent-4: #ff8b4a;
  --hestia-accent-5: #ffd69a;
  --hestia-focus: #ff9b74;

  --primary: #dc4b40;
  --primary-dark: #a52a36;
  --primary-soft: #2d1719;
  --teal: #33a878;
  --teal-soft: #14271f;
  --success: #68d3a4;
  --warning: #e1a45f;
  --danger: #ff9b74;
  --ochre: #ff9b74;
  --shadow: 0 24px 70px rgba(0, 0, 0, .34);

  --forest: #dc4b40;
  --forest-deep: #07110d;
  --sage: #769185;
  --ember: #ff8b4a;
  --garnet: #ff9b74;
  --soft-line: rgba(191, 197, 192, .1);
}

.hestia-app-header {
  position: sticky;
  z-index: 100;
  top: 0;
  min-height: 76px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  padding: 12px clamp(16px, 3vw, 46px);
  color: var(--hestia-text);
  background: var(--hestia-header);
  border-block: 1px solid var(--hestia-line);
  backdrop-filter: blur(18px);
}

.hestia-app-brand {
  min-width: 0;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  text-decoration: none;
}

.hestia-app-brand img {
  width: 48px;
  height: 48px;
  flex: none;
}

.hestia-app-brand__text {
  min-width: 0;
  display: grid;
  gap: 1px;
}

.hestia-app-brand__text strong {
  color: var(--hestia-text);
  font: 400 clamp(1.2rem, 2vw, 1.7rem) Marcellus, Georgia, serif;
  letter-spacing: .07em;
}

.hestia-app-brand__text small {
  overflow: hidden;
  color: var(--hestia-text-muted);
  font: 700 .6rem var(--mono);
  letter-spacing: .1em;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

.hestia-app-nav {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: clamp(12px, 1.8vw, 25px);
}

.hestia-app-nav a {
  color: var(--hestia-text);
  font: 700 .68rem var(--sans);
  letter-spacing: .08em;
  text-decoration: none;
  text-transform: uppercase;
  white-space: nowrap;
}

.hestia-app-nav a:hover { color: var(--hestia-accent-3); }

.hestia-app-badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  color: var(--hestia-accent-3);
  background: color-mix(in srgb, var(--hestia-accent-3) 9%, var(--hestia-surface));
  border: 1px solid color-mix(in srgb, var(--hestia-accent-3) 32%, var(--hestia-line));
  border-radius: 999px;
  font: 700 .61rem var(--mono);
  letter-spacing: .1em;
  text-transform: uppercase;
}

.hestia-theme-toggle {
  width: 48px;
  height: 48px;
  display: inline-grid;
  place-items: center;
  padding: 0;
  color: var(--hestia-text);
  background: var(--hestia-surface);
  border: 1px solid var(--hestia-line-strong);
  border-radius: 10px;
  cursor: pointer;
  font: 700 1rem var(--sans);
}

.hestia-theme-toggle:hover { background: var(--hestia-surface-muted); }
.hestia-theme-toggle:focus-visible,
.hestia-app-header a:focus-visible {
  outline: 3px solid var(--hestia-focus);
  outline-offset: 3px;
}

.hestia-theme-toggle__sun { display: none; }
:root[data-theme="dark"] .hestia-theme-toggle__moon { display: none; }
:root[data-theme="dark"] .hestia-theme-toggle__sun { display: inline; }

.hestia-extension-note {
  width: min(calc(100% - 48px), 1180px);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: .75rem 1rem;
  align-items: start;
  margin: 22px auto 0;
  padding: 14px 16px;
  color: var(--hestia-text-muted);
  background: var(--hestia-surface);
  border: 1px solid var(--hestia-line);
  border-left: 3px solid var(--hestia-accent-3);
  border-radius: 10px;
  font-size: .78rem;
  line-height: 1.55;
}

.hestia-extension-note strong {
  color: var(--hestia-accent-3);
  font: 700 .64rem var(--mono);
  letter-spacing: .08em;
  text-transform: uppercase;
}

.hestia-extension-note p { margin: 0; }
.hestia-extension-note a { color: var(--hestia-text); font-weight: 700; }

/* Bring the existing app canvases onto the same adaptive foundation. */
html,
body { background-color: var(--hestia-canvas); }

:root[data-theme="dark"] body {
  color: var(--hestia-text);
  background:
    radial-gradient(circle at 76% 0%, rgba(220, 75, 64, .1), transparent 27rem),
    radial-gradient(circle at 12% 30rem, rgba(51, 168, 120, .08), transparent 32rem),
    var(--hestia-canvas);
}

:root[data-theme="dark"] h1,
:root[data-theme="dark"] h2,
:root[data-theme="dark"] h3,
:root[data-theme="dark"] .card,
:root[data-theme="dark"] .message-result { color: var(--hestia-text); }

:root[data-theme="dark"] .hero-copy > p,
:root[data-theme="dark"] .tool-card > p,
:root[data-theme="dark"] .negotiation-grid p,
:root[data-theme="dark"] .offer-sheet blockquote { color: var(--hestia-text-muted); }

:root[data-theme="dark"] .story-step,
:root[data-theme="dark"] .panel,
:root[data-theme="dark"] .technical-panel,
:root[data-theme="dark"] .card,
:root[data-theme="dark"] .hero-status,
:root[data-theme="dark"] .stage-result,
:root[data-theme="dark"] textarea,
:root[data-theme="dark"] .offer-sheet,
:root[data-theme="dark"] .tool-card {
  color: var(--hestia-text);
  background: color-mix(in srgb, var(--hestia-surface) 92%, transparent);
  border-color: var(--hestia-line);
}

:root[data-theme="dark"] .demo-scene > figure,
:root[data-theme="dark"] .persona,
:root[data-theme="dark"] .messages,
:root[data-theme="dark"] .process-steps li,
:root[data-theme="dark"] .stage.complete {
  background: var(--hestia-surface-muted);
}

:root[data-theme="dark"] button:not(.primary):not(.ember):not(.quiet),
:root[data-theme="dark"] .button:not(.primary):not(.ember) {
  color: var(--hestia-text);
  background: var(--hestia-surface);
  border-color: var(--hestia-line-strong);
}

:root[data-theme="dark"] button.primary {
  color: #fff8ed;
  background: var(--hestia-accent-2);
  border-color: var(--hestia-accent-3);
}

:root[data-theme="dark"] .result {
  color: #9de1c3;
  background: rgba(51, 168, 120, .1);
  border-left-color: #68d3a4;
}

:root[data-theme="dark"] .status.good,
:root[data-theme="dark"] .badge {
  color: #9de1c3;
  background: #14271f;
}

:root[data-theme="dark"] .success-callout {
  color: #9de1c3;
  background: #14271f;
}

:root[data-theme="dark"] .loss-callout,
:root[data-theme="dark"] .warning {
  color: #ffb393;
  background: #2d1719;
}

:root[data-theme="dark"] .code,
:root[data-theme="dark"] .architecture-note {
  color: var(--hestia-text);
  background: var(--hestia-surface-muted);
}

:root[data-theme="dark"] .architecture-note strong,
:root[data-theme="dark"] .code { color: #ffb393; }

:root[data-theme="dark"] .offer-sheet dt,
:root[data-theme="dark"] .offer-sheet .empty { color: var(--hestia-text-muted); }

@media (max-width: 800px) {
  .hestia-app-header { grid-template-columns: minmax(0, 1fr) auto; min-height: 68px; padding: 9px 12px; }
  .hestia-app-brand img { width: 44px; height: 44px; }
  .hestia-app-nav { display: none; }
  .hestia-theme-toggle { width: 44px; height: 44px; }
  .hestia-extension-note { width: calc(100% - 28px); grid-template-columns: 1fr; margin-top: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  .hestia-theme-toggle { transition: none !important; }
}