/*
 * @3xo3/ui v0.2.0 — the shared shell for the 3xo3 family.
 *
 * Scope: tokens, the three app type sizes, one focus ring, one easing, and the
 * components every app otherwise rewrites. The layer stays small: if only one
 * app needs it, it belongs in that app.
 *
 * Each app sets one attribute: data-app="uhh|play|focus|write|sound|ledger|control".
 * A bespoke accent may override --accent, --accent-strong, --accent-text and
 * --accent-contrast instead.
 *
 * Dark mode: data-theme="dark" on <html>.
 * Battery saver: data-perf="low" on <html>.
 */

:root {
  /* Type --------------------------------------------------------------- */
  --font-scale: 1;
  --font-ui: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'SF Pro Display',
    'Helvetica Neue', 'PingFang SC', 'Noto Sans SC', Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, 'Liberation Mono', monospace;

  --text-title: 19px;
  --text-body: 13px;
  --text-meta: 11px;
  --leading-title: 1.25;
  --leading-body: 1.55;
  --leading-meta: 1.45;
  --weight-medium: 550;
  --weight-semibold: 600;

  /* Colour: light ------------------------------------------------------ */
  --bg: #fbfaf8;
  --bg-subtle: #f3f1ed;
  --bg-elevated: #ffffff;
  --bg-inset: #eeece6;
  --text: #17181b;
  --text-secondary: #5f6470;
  --text-tertiary: #858a95;
  --border: rgba(17, 19, 24, 0.12);
  --border-strong: rgba(17, 19, 24, 0.22);

  --accent: #2463eb;
  --accent-strong: #1d4ed8;
  --accent-text: #1d4ed8;
  --accent-contrast: #ffffff;
  --accent-soft: color-mix(in srgb, var(--accent) 11%, transparent);

  --success: #166534;
  --success-text: #166534;
  --warning: #b45309;
  --warning-text: #b45309;
  --danger: #b91c1c;
  --danger-text: #b91c1c;
  --danger-contrast: #ffffff;

  /* Depth -------------------------------------------------------------- */
  --shadow: 0 1px 2px rgba(12, 15, 22, 0.06), 0 8px 24px -18px rgba(12, 15, 22, 0.28);
  --shadow-floating: 0 18px 44px -20px rgba(15, 23, 42, 0.4), 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-modal: 0 44px 120px -36px rgba(15, 23, 42, 0.5), 0 3px 12px rgba(0, 0, 0, 0.08);

  /* Space, shape, layout ---------------------------------------------- */
  --space-1: 4px;
  --space-2: 6px;
  --space-3: 8px;
  --space-4: 10px;
  --space-5: 12px;
  --space-6: 16px;
  --space-7: 20px;
  --space-8: 24px;
  --space-9: 32px;
  --space-10: 40px;

  --radius-sm: 7px;
  --radius-md: 10px;
  --radius-lg: 15px;
  --radius-pill: 999px;

  --sidebar-w: 220px;
  --topbar-h: 56px;

  /* Motion and layers -------------------------------------------------- */
  --ease: cubic-bezier(0.2, 0.8, 0.3, 1);
  --fast: 140ms;
  --normal: 200ms;

  --z-modal: 8900;
  --z-floating: 8950;
  --z-toast: 9000;
}

:root[data-theme='dark'] {
  --bg: #0b0c0f;
  --bg-subtle: #121317;
  --bg-elevated: #17181d;
  --bg-inset: #0e0f13;
  --text: #f2f3f5;
  --text-secondary: #9aa1ae;
  --text-tertiary: #707784;
  --border: rgba(255, 255, 255, 0.1);
  --border-strong: rgba(255, 255, 255, 0.2);

  --accent: #2463eb;
  --accent-strong: #1d4ed8;
  --accent-text: #7aa7ff;
  --accent-contrast: #ffffff;
  --accent-soft: color-mix(in srgb, var(--accent) 11%, transparent);

  --success: #166534;
  --success-text: #86efac;
  --warning: #b45309;
  --warning-text: #fbbf24;
  --danger: #b91c1c;
  --danger-text: #fca5a5;
  --danger-contrast: #ffffff;

  --shadow: 0 1px 2px rgba(0, 0, 0, 0.5), 0 10px 30px -20px rgba(0, 0, 0, 0.7);
  --shadow-floating: 0 20px 50px -18px rgba(0, 0, 0, 0.72), 0 4px 14px rgba(0, 0, 0, 0.4);
  --shadow-modal: 0 48px 140px -32px rgba(0, 0, 0, 0.82), 0 4px 16px rgba(0, 0, 0, 0.5);
}

/* One accent per app. --accent-soft follows --accent automatically. */
:root[data-app='uhh'] {
  --accent: #2463eb;
  --accent-strong: #1d4ed8;
  --accent-text: #1d4ed8;
  --accent-contrast: #ffffff;
}

:root[data-app='play'] {
  --accent: #7c3aed;
  --accent-strong: #6d28d9;
  --accent-text: #6d28d9;
  --accent-contrast: #ffffff;
}

:root[data-app='focus'] {
  --accent: #0f766e;
  --accent-strong: #115e59;
  --accent-text: #0f766e;
  --accent-contrast: #ffffff;
}

:root[data-app='write'] {
  --accent: #b45309;
  --accent-strong: #92400e;
  --accent-text: #92400e;
  --accent-contrast: #ffffff;
}

:root[data-app='sound'] {
  --accent: #db2777;
  --accent-strong: #be185d;
  --accent-text: #be185d;
  --accent-contrast: #ffffff;
}

:root[data-app='ledger'] {
  --accent: #475569;
  --accent-strong: #334155;
  --accent-text: #334155;
  --accent-contrast: #ffffff;
}

:root[data-app='control'] {
  --accent: #334155;
  --accent-strong: #1e293b;
  --accent-text: #334155;
  --accent-contrast: #ffffff;
}

:root[data-theme='dark'][data-app='uhh'] {
  --accent-text: #7aa7ff;
}

:root[data-theme='dark'][data-app='play'] {
  --accent-text: #b39dfc;
}

:root[data-theme='dark'][data-app='focus'] {
  --accent-text: #5eead4;
}

:root[data-theme='dark'][data-app='write'] {
  --accent-text: #fbbf24;
}

:root[data-theme='dark'][data-app='sound'] {
  --accent-text: #f9a8d4;
}

:root[data-theme='dark'][data-app='ledger'] {
  --accent-text: #cbd5e1;
}

:root[data-theme='dark'][data-app='control'] {
  --accent-text: #e2e8f0;
}

:root {
  color-scheme: light;
}

:root[data-theme='dark'] {
  color-scheme: dark;
}

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

body {
  margin: 0;
  font-family: var(--font-ui);
  font-size: calc(var(--text-body) * var(--font-scale));
  line-height: var(--leading-body);
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

button {
  cursor: pointer;
}

button:disabled,
[aria-disabled='true'] {
  cursor: not-allowed;
}

a {
  color: var(--accent-text);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

img,
svg {
  display: block;
}

[hidden] {
  display: none !important;
}

::selection {
  background: color-mix(in srgb, var(--accent) 24%, transparent);
}

:where(button, a, input, select, textarea, [tabindex]):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Three app sizes. Display type belongs to the site lobby, not the apps. */
.t-title {
  margin: 0;
  font-size: calc(var(--text-title) * var(--font-scale));
  line-height: var(--leading-title);
  font-weight: var(--weight-semibold);
  letter-spacing: -0.015em;
  text-wrap: balance;
}

.t-body {
  margin: 0;
  font-size: calc(var(--text-body) * var(--font-scale));
  line-height: var(--leading-body);
}

.t-meta {
  margin: 0;
  font-size: calc(var(--text-meta) * var(--font-scale));
  line-height: var(--leading-meta);
  color: var(--text-secondary);
}

.t-label {
  margin: 0;
  font-size: calc(var(--text-meta) * var(--font-scale));
  line-height: var(--leading-meta);
  font-weight: var(--weight-semibold);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.num {
  font-variant-numeric: tabular-nums;
}

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

.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;
}

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

/* Layout: the app frame every sibling starts from. */
.app {
  display: flex;
  flex-direction: column;
  height: 100dvh;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
}

.app-body {
  display: flex;
  flex: 1;
  min-height: 0;
}

.sidebar {
  display: flex;
  flex: 0 0 var(--sidebar-w);
  flex-direction: column;
  gap: 2px;
  width: var(--sidebar-w);
  padding: var(--space-4) var(--space-3) var(--space-5);
  overflow-y: auto;
  border-right: 1px solid var(--border);
  background: var(--bg-subtle);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 2px 10px var(--space-5);
  color: var(--text);
  font-size: calc(14px * var(--font-scale));
  font-weight: var(--weight-semibold);
  letter-spacing: 0.01em;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  flex: none;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: var(--radius-sm);
  background: var(--text);
  color: var(--bg);
  font-size: calc(13px * var(--font-scale));
  font-weight: var(--weight-semibold);
}

.sidebar-label {
  padding: var(--space-5) 10px var(--space-1);
  font-size: calc(10.5px * var(--font-scale));
  font-weight: var(--weight-semibold);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  width: 100%;
  padding: 7px 10px;
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text);
  font-size: calc(var(--text-body) * var(--font-scale));
  line-height: 1.4;
  text-align: left;
  text-decoration: none;
  transition:
    background-color var(--fast) var(--ease),
    color var(--fast) var(--ease);
}

.nav-item:hover {
  background: color-mix(in srgb, var(--bg) 72%, transparent);
}

.nav-item[aria-current='page'],
.nav-item.active {
  background: var(--accent);
  color: var(--accent-contrast);
}

.nav-item[aria-current='page']:hover,
.nav-item.active:hover {
  background: var(--accent);
}

.nav-icon {
  flex: none;
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 0.82;
}

.nav-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 17px;
  height: 16px;
  margin-left: auto;
  padding: 0 5px;
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--text) 8%, transparent);
  color: var(--text-secondary);
  font-size: calc(9.5px * var(--font-scale));
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.nav-item[aria-current='page'] .nav-badge,
.nav-item.active .nav-badge {
  background: var(--accent-contrast);
  color: var(--accent);
}

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

.topbar {
  display: flex;
  flex: 0 0 var(--topbar-h);
  align-items: center;
  gap: var(--space-5);
  height: var(--topbar-h);
  padding: 0 var(--space-7);
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  -webkit-backdrop-filter: blur(12px) saturate(120%);
  backdrop-filter: blur(12px) saturate(120%);
}

.topbar-title {
  overflow: hidden;
  color: var(--text);
  font-size: calc(13px * var(--font-scale));
  font-weight: var(--weight-semibold);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar-spacer {
  flex: 1;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.content-body {
  flex: 1;
  min-height: 0;
  overflow: auto;
}

.page {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-8) var(--space-10);
}

.page-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-6);
  margin-bottom: var(--space-7);
}

.page-head-copy {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-width: 0;
}

/* Surfaces. */
.card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
  box-shadow: var(--shadow);
}

.card-flat {
  box-shadow: none;
}

.panel {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: var(--space-6) 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
  box-shadow: var(--shadow);
}

.panel-flat {
  background: var(--bg-subtle);
  box-shadow: none;
}

.panel-head {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.panel-head h3 {
  margin: 0;
  font-size: calc(var(--text-meta) * var(--font-scale));
  font-weight: var(--weight-semibold);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.panel-head p {
  margin: 0;
  font-size: calc(var(--text-meta) * var(--font-scale));
  line-height: 1.5;
  color: var(--text-secondary);
}

.divider {
  width: 100%;
  height: 1px;
  margin: 0;
  border: 0;
  background: var(--border);
}

/* Buttons. */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 30px;
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  color: var(--text);
  font-family: inherit;
  font-size: calc(12.5px * var(--font-scale));
  font-weight: var(--weight-medium);
  line-height: 1.2;
  white-space: nowrap;
  text-decoration: none;
  transition:
    background-color var(--fast) var(--ease),
    border-color var(--fast) var(--ease),
    color var(--fast) var(--ease),
    transform var(--fast) var(--ease);
}

.btn:hover {
  border-color: var(--border-strong);
  background: var(--bg-subtle);
}

.btn:active {
  transform: translateY(1px);
}

.btn:disabled,
.btn[aria-disabled='true'] {
  opacity: 0.45;
  pointer-events: none;
}

.btn svg {
  flex: none;
  width: 14px;
  height: 14px;
}

.btn-solid {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-contrast);
}

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

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

.btn-ghost:hover {
  border-color: transparent;
  background: color-mix(in srgb, var(--text) 7%, transparent);
  color: var(--text);
}

.btn-danger {
  border-color: var(--danger);
  background: var(--danger);
  color: var(--danger-contrast);
}

.btn-danger:hover {
  border-color: color-mix(in srgb, var(--danger) 86%, #000000);
  background: color-mix(in srgb, var(--danger) 86%, #000000);
}

.btn-sm {
  min-height: 26px;
  padding: 3px 9px;
  font-size: calc(11.5px * var(--font-scale));
}

.btn-lg {
  min-height: 36px;
  padding: 7px 16px;
  font-size: calc(13.5px * var(--font-scale));
}

.btn-icon {
  width: 30px;
  min-width: 30px;
  padding: 0;
}

.btn-sm.btn-icon {
  width: 26px;
  min-width: 26px;
}

/* Inputs. */
.field {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.field-label {
  font-size: calc(var(--text-meta) * var(--font-scale));
  font-weight: var(--weight-medium);
  line-height: 1.4;
  color: var(--text);
}

.field-hint {
  font-size: calc(var(--text-meta) * var(--font-scale));
  line-height: 1.5;
  color: var(--text-secondary);
}

.field-error {
  font-size: calc(var(--text-meta) * var(--font-scale));
  line-height: 1.5;
  color: var(--danger-text);
}

.input,
.textarea,
.select {
  width: 100%;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  color: var(--text);
  font-family: inherit;
  font-size: calc(var(--text-body) * var(--font-scale));
  line-height: 1.4;
  transition:
    border-color var(--fast) var(--ease),
    box-shadow var(--fast) var(--ease);
}

.input {
  min-height: 32px;
}

.textarea {
  min-height: 84px;
  resize: vertical;
}

.select {
  padding-right: 30px;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 4.5 6 7.5 9 4.5' fill='none' stroke='%23858a95' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
}

.input::placeholder,
.textarea::placeholder {
  color: var(--text-tertiary);
}

.input:hover,
.textarea:hover,
.select:hover {
  border-color: var(--border-strong);
}

.input:focus,
.textarea:focus,
.select:focus {
  border-color: var(--accent);
  outline: none;
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.input[aria-invalid='true'],
.textarea[aria-invalid='true'],
.select[aria-invalid='true'] {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--danger) 14%, transparent);
}

.search {
  position: relative;
}

.search .input {
  padding-right: 48px;
}

.search .kbd {
  position: absolute;
  top: 50%;
  right: 8px;
  transform: translateY(-50%);
  pointer-events: none;
}

/* Segmented control. */
.segmented {
  display: inline-flex;
  gap: 2px;
  padding: 2px;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background: var(--bg-subtle);
}

.segmented button {
  padding: 4px 12px;
  border: 0;
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--text-secondary);
  font-size: calc(12px * var(--font-scale));
  line-height: 1.4;
  white-space: nowrap;
  transition:
    background-color var(--fast) var(--ease),
    color var(--fast) var(--ease);
}

.segmented button:hover:not([aria-pressed='true']):not([aria-selected='true']):not(.active) {
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  color: var(--text);
}

.segmented button[aria-pressed='true'],
.segmented button[aria-selected='true'],
.segmented button.active {
  background: var(--accent);
  color: var(--accent-contrast);
}

/* Switch. */
.switch {
  position: relative;
  flex: none;
  width: 38px;
  height: 22px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background: var(--bg-subtle);
  transition:
    background-color var(--fast) var(--ease),
    border-color var(--fast) var(--ease);
}

.switch::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg-elevated);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
  transition: transform var(--fast) var(--ease);
}

.switch[aria-checked='true'] {
  border-color: var(--accent);
  background: var(--accent);
}

.switch[aria-checked='true']::after {
  background: var(--accent-contrast);
  transform: translateX(16px);
}

/* Settings rows. */
.settings-list {
  display: flex;
  flex-direction: column;
}

.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding: 12px 0;
}

.settings-list > .settings-row + .settings-row {
  border-top: 1px solid var(--border);
}

.settings-row:first-child {
  padding-top: 0;
}

.settings-row:last-child {
  padding-bottom: 0;
}

.settings-row-copy {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.settings-row-title {
  font-size: calc(var(--text-body) * var(--font-scale));
  font-weight: var(--weight-medium);
  line-height: 1.4;
}

.settings-row-hint {
  max-width: 52ch;
  font-size: calc(var(--text-meta) * var(--font-scale));
  line-height: 1.5;
  color: var(--text-secondary);
}

.settings-row-control {
  display: flex;
  flex: none;
  align-items: center;
  gap: var(--space-3);
}

/* Badges and keys. */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 1px 7px;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background: var(--bg-subtle);
  color: var(--text-secondary);
  font-size: calc(10.5px * var(--font-scale));
  font-weight: var(--weight-semibold);
  line-height: 1.5;
  white-space: nowrap;
}

.badge-accent {
  border-color: color-mix(in srgb, var(--accent) 26%, transparent);
  background: var(--accent-soft);
  color: var(--accent-text);
}

.badge-success {
  border-color: color-mix(in srgb, var(--success) 26%, transparent);
  background: color-mix(in srgb, var(--success) 11%, transparent);
  color: var(--success-text);
}

.badge-warning {
  border-color: color-mix(in srgb, var(--warning) 26%, transparent);
  background: color-mix(in srgb, var(--warning) 11%, transparent);
  color: var(--warning-text);
}

.badge-danger {
  border-color: color-mix(in srgb, var(--danger) 26%, transparent);
  background: color-mix(in srgb, var(--danger) 11%, transparent);
  color: var(--danger-text);
}

.kbd {
  display: inline-flex;
  align-items: center;
  min-height: 18px;
  padding: 0 5px;
  border: 1px solid var(--border);
  border-bottom-color: var(--border-strong);
  border-radius: 5px;
  background: var(--bg-subtle);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: calc(10px * var(--font-scale));
  line-height: 1.5;
}

/* Empty state. */
.empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: 34px var(--space-8);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  text-align: center;
}

.empty-icon {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  margin-bottom: var(--space-1);
  border-radius: 12px;
  background: var(--bg-subtle);
  color: var(--text-secondary);
}

.empty-icon svg {
  width: 18px;
  height: 18px;
}

.empty-title {
  color: var(--text);
  font-size: calc(13.5px * var(--font-scale));
  font-weight: var(--weight-semibold);
  line-height: 1.4;
}

.empty-body {
  max-width: 44ch;
  font-size: calc(var(--text-body) * var(--font-scale));
  line-height: 1.55;
}

.empty-actions {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

/* Toast. */
.toast-stack {
  position: fixed;
  bottom: var(--space-8);
  left: 50%;
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  width: max-content;
  max-width: calc(100% - 32px);
  transform: translateX(-50%);
  pointer-events: none;
}

.toast {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  max-width: 100%;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  background: var(--text);
  color: var(--bg);
  font-size: calc(12px * var(--font-scale));
  line-height: 1.4;
  box-shadow: var(--shadow-floating);
  animation: toast-in var(--normal) var(--ease) both;
}

.toast::before {
  content: '';
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.55;
}

.toast-success::before {
  background: #4ade80;
  opacity: 1;
}

.toast-danger::before {
  background: #f87171;
  opacity: 1;
}

/* Modal. */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: grid;
  place-items: center;
  padding: var(--space-8);
  background: color-mix(in srgb, #000000 42%, transparent);
  -webkit-backdrop-filter: blur(10px) saturate(120%);
  backdrop-filter: blur(10px) saturate(120%);
  animation: backdrop-in var(--normal) var(--ease) both;
}

.modal {
  display: flex;
  flex-direction: column;
  width: min(var(--modal-width, 560px), 100%);
  max-height: min(680px, 90vh);
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: calc(var(--radius-lg) + 3px);
  background: var(--bg-elevated);
  color: var(--text);
  box-shadow: var(--shadow-modal);
  animation: modal-in var(--normal) var(--ease) both;
}

.modal-head {
  display: flex;
  flex: none;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-6);
  padding: 15px 18px 14px;
  border-bottom: 1px solid var(--border);
}

.modal-title-group {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.modal-title {
  margin: 0;
  font-size: calc(15px * var(--font-scale));
  font-weight: var(--weight-semibold);
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.modal-subtitle {
  margin: 0;
  font-size: calc(var(--text-meta) * var(--font-scale));
  line-height: 1.5;
  color: var(--text-secondary);
}

.modal-close {
  display: inline-flex;
  flex: none;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  padding: 0;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  transition:
    background-color var(--fast) var(--ease),
    border-color var(--fast) var(--ease),
    color var(--fast) var(--ease);
}

.modal-close:hover {
  border-color: var(--border);
  background: var(--bg-subtle);
  color: var(--text);
}

.modal-close svg {
  width: 15px;
  height: 15px;
}

.modal-body {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 18px;
  overflow: auto;
}

.modal-foot {
  display: flex;
  flex: none;
  justify-content: flex-end;
  gap: var(--space-3);
  padding: 12px 18px;
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
}

/* Utilities. */
.row {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.row-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.spacer {
  flex: 1;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(8px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes backdrop-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes modal-in {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.985);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@media (max-width: 720px) {
  .page {
    padding: var(--space-6) var(--space-6) var(--space-9);
  }

  .topbar {
    padding: 0 var(--space-5);
  }

  .settings-row {
    align-items: flex-start;
    flex-direction: column;
    gap: var(--space-3);
  }

  .settings-row-control {
    width: 100%;
  }

  .modal-backdrop {
    padding: var(--space-4);
  }

  .toast-stack {
    bottom: var(--space-4);
  }
}

/* Motion, with an honest off switch. */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
  }
}

:root[data-perf='low'] *,
:root[data-perf='low'] *::before,
:root[data-perf='low'] *::after {
  animation: none !important;
  transition: none !important;
  box-shadow: none !important;
  filter: none !important;
  -webkit-backdrop-filter: none !important;
  backdrop-filter: none !important;
  scroll-behavior: auto !important;
}