:root {
  color-scheme: dark;
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-raised: #273449;
  --glass: rgba(15, 23, 42, 0.74);
  --glass-strong: rgba(20, 30, 50, 0.94);
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #e879f9;
  --accent-light: #f5d0fe;
  --accent-soft: rgba(232, 121, 249, 0.16);
  --accent-line: rgba(232, 121, 249, 0.55);
  --line: rgba(148, 163, 184, 0.18);
  --line-strong: rgba(148, 163, 184, 0.34);
  --radius: 12px;
  --shadow: 0 12px 32px rgba(2, 6, 23, 0.45), 0 2px 8px rgba(2, 6, 23, 0.35);
  --speed: 200ms;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --gap: 12px;
  --tap: 44px;
  --header-h: 56px;
  --footer-h: 40px;
  --drawer-w: 340px;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --font: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --mono: ui-monospace, 'SF Mono', 'Cascadia Mono', 'Segoe UI Mono', Menlo, Consolas, monospace;
}

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

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

body {
  overflow: hidden;
  overscroll-behavior: none;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.45 var(--font);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

[hidden] {
  display: none !important;
}

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

button {
  cursor: pointer;
}

button:disabled {
  cursor: default;
  opacity: 0.38;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.icon {
  flex: none;
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Play area: the only element that takes over touch gestures. */
.view {
  position: fixed;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  background: var(--bg);
  touch-action: none;
  cursor: grab;
  user-select: none;
  -webkit-user-select: none;
}

.view[data-gesture='drag'],
.view[data-gesture='pinch'] {
  cursor: grabbing;
}

.view[data-gesture='box'],
body.picking .view {
  cursor: crosshair;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap);
  height: calc(var(--header-h) + var(--safe-top));
  padding: var(--safe-top) calc(var(--gap) + var(--safe-right)) 0 calc(var(--gap) + var(--safe-left));
  border-bottom: 1px solid var(--line);
  background: var(--glass);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  margin: 0;
  font-size: 17px;
  font-weight: 650;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.brand span {
  overflow: hidden;
  text-overflow: ellipsis;
}

.brand-logo {
  flex: none;
  width: 26px;
  height: 26px;
  fill: var(--accent);
  filter: drop-shadow(0 0 6px rgba(232, 121, 249, 0.5));
}

.brand-antenna {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.2;
  stroke-linecap: round;
}

.header-actions {
  display: flex;
  flex: none;
  align-items: center;
  gap: 6px;
}

.header-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: var(--tap);
  height: 40px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(30, 41, 59, 0.6);
  font-size: 14px;
  font-weight: 600;
  transition:
    background var(--speed) var(--ease),
    border-color var(--speed) var(--ease),
    color var(--speed) var(--ease);
}

.header-button:hover {
  border-color: var(--line-strong);
  background: var(--surface-raised);
}

.lang-button {
  padding: 0 10px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

#controls[aria-expanded='true'] {
  border-color: var(--accent-line);
  background: var(--accent-soft);
  color: var(--accent-light);
}

/* Progress bar under the header */
.progress {
  position: fixed;
  top: calc(var(--header-h) + var(--safe-top));
  right: 0;
  left: 0;
  z-index: 21;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #a78bfa);
  box-shadow: 0 0 8px var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 160ms linear;
}

/* Notices and toasts */
.messages {
  position: fixed;
  top: calc(var(--header-h) + var(--safe-top) + var(--gap) + 4px);
  left: 50%;
  z-index: 15;
  display: grid;
  justify-items: center;
  gap: 8px;
  width: min(520px, calc(100% - 2 * var(--gap) - var(--safe-left) - var(--safe-right)));
  pointer-events: none;
  transform: translateX(-50%);
  transition: left var(--speed) var(--ease);
}

.notice,
.toast {
  margin: 0;
  padding: 10px 14px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  font-size: 14px;
  text-align: center;
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.notice {
  border: 1px solid rgba(251, 191, 36, 0.45);
  background: rgba(69, 39, 10, 0.88);
  color: #fde68a;
}

.toast {
  border: 1px solid var(--line-strong);
  background: var(--glass-strong);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition:
    opacity var(--speed) var(--ease),
    transform var(--speed) var(--ease),
    visibility 0s linear var(--speed);
}

.toast.visible {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition:
    opacity var(--speed) var(--ease),
    transform var(--speed) var(--ease);
}

.toast:empty {
  display: none;
}

/* Shift-drag zoom box */
.zoom-box {
  position: fixed;
  z-index: 5;
  border: 1.5px dashed var(--accent);
  border-radius: 4px;
  background: rgba(232, 121, 249, 0.08);
  box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.6);
  pointer-events: none;
}

/* View tools: a floating column on the right (a row above the info bar on tall phones) */
.toolbar {
  position: fixed;
  top: 50%;
  right: calc(var(--gap) + var(--safe-right));
  z-index: 12;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--glass);
  box-shadow: var(--shadow);
  pointer-events: auto;
  transform: translateY(-50%);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  transition:
    right 240ms var(--ease),
    opacity var(--speed) var(--ease),
    visibility var(--speed);
}

.tool {
  display: grid;
  place-items: center;
  width: var(--tap);
  height: var(--tap);
  padding: 0;
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  transition:
    background var(--speed) var(--ease),
    border-color var(--speed) var(--ease),
    color var(--speed) var(--ease);
}

.tool:hover:not(:disabled) {
  background: rgba(148, 163, 184, 0.14);
}

.tool[aria-pressed='true'] {
  border-color: var(--accent-line);
  background: var(--accent-soft);
  color: var(--accent-light);
}

.tool .icon {
  width: 22px;
  height: 22px;
}

/* Info bar and Julia preview, bottom left */
.hud {
  position: fixed;
  bottom: calc(var(--footer-h) + var(--safe-bottom) + var(--gap));
  left: calc(var(--gap) + var(--safe-left));
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  max-width: calc(100% - 2 * var(--gap) - var(--safe-left) - var(--safe-right));
  pointer-events: none;
}

.preview {
  position: relative;
  margin: 0;
  padding: 6px;
  border: 1px solid var(--accent-line);
  border-radius: var(--radius);
  background: var(--glass);
  box-shadow: var(--shadow);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.preview-close {
  position: absolute;
  top: 0;
  right: 0;
  display: grid;
  place-items: center;
  width: var(--tap);
  height: var(--tap);
  padding: 0;
  border: 0;
  border-radius: var(--radius);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  pointer-events: auto;
  transition: color var(--speed) var(--ease);
}

.preview-close::before {
  content: '';
  position: absolute;
  inset: 10px;
  border-radius: 50%;
  background: var(--glass);
  border: 1px solid var(--accent-line);
}

.preview-close .icon {
  position: relative;
  width: 14px;
  height: 14px;
}

.preview-close:hover,
.preview-close:focus-visible {
  color: var(--accent);
}

.preview canvas {
  display: block;
  width: 168px;
  height: 112px;
  border-radius: 8px;
  background: var(--bg);
}

.preview figcaption {
  display: grid;
  gap: 1px;
  padding: 6px 4px 2px;
}

.preview-title {
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.preview-c {
  font-family: var(--mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.info {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  max-width: 100%;
  margin: 0;
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--glass);
  box-shadow: var(--shadow);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.info-item {
  min-width: 0;
}

.info dt {
  color: var(--muted);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.info dd {
  margin: 1px 0 0;
  overflow: hidden;
  font-family: var(--mono);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.info-center dd {
  color: var(--accent-light);
}

/* Controls drawer: a side panel on wide screens, a bottom sheet on phones */
.drawer {
  position: fixed;
  top: calc(var(--header-h) + var(--safe-top) + var(--gap));
  right: calc(var(--gap) + var(--safe-right));
  bottom: calc(var(--footer-h) + var(--safe-bottom) + var(--gap));
  z-index: 18;
  display: flex;
  flex-direction: column;
  width: var(--drawer-w);
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--glass-strong);
  box-shadow: var(--shadow);
  visibility: hidden;
  transform: translateX(calc(100% + var(--gap) + var(--safe-right) + 8px));
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  transition:
    transform 240ms var(--ease),
    visibility 0s linear 240ms;
}

body.drawer-open .drawer {
  visibility: visible;
  transform: none;
  transition: transform 240ms var(--ease);
}

.drawer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 6px 6px 18px;
  border-bottom: 1px solid var(--line);
}

.drawer-head h2 {
  margin: 0;
  font-size: 15px;
  font-weight: 650;
}

.drawer-body {
  flex: 1 1 auto;
  min-height: 0;
  padding: 2px 16px 16px;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-color: rgba(148, 163, 184, 0.3) transparent;
  scrollbar-width: thin;
}

.panel {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.panel:last-child {
  border-bottom: 0;
}

.panel h3 {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.panel-value {
  color: var(--text);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0;
  text-transform: none;
}

.chip-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.chip {
  min-height: 40px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(30, 41, 59, 0.7);
  font-size: 13.5px;
  font-weight: 550;
  text-align: left;
  transition:
    background var(--speed) var(--ease),
    border-color var(--speed) var(--ease),
    color var(--speed) var(--ease);
}

.chip:hover {
  border-color: var(--line-strong);
  background: var(--surface-raised);
}

.chip[aria-pressed='true'] {
  border-color: var(--accent-line);
  background: var(--accent-soft);
  color: var(--accent-light);
  box-shadow: inset 0 0 0 1px var(--accent-line);
}

.swatch-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
}

.swatch {
  height: 40px;
  padding: 0;
  border: 2px solid transparent;
  border-radius: 10px;
  background-color: var(--surface);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
  transition:
    transform var(--speed) var(--ease),
    border-color var(--speed) var(--ease),
    box-shadow var(--speed) var(--ease);
}

.swatch:hover {
  transform: translateY(-1px);
}

.swatch[aria-pressed='true'] {
  border-color: var(--accent);
  box-shadow:
    inset 0 0 0 2px var(--bg),
    0 0 12px rgba(232, 121, 249, 0.45);
}

.slider {
  display: block;
  margin-top: 12px;
}

.slider-label {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 13px;
}

.slider-label output {
  color: var(--text);
  font-family: var(--mono);
  font-size: 12.5px;
}

input[type='range'] {
  display: block;
  width: 100%;
  height: 40px;
  margin: 0;
  background: transparent;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}

input[type='range']::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.28);
}

input[type='range']::-webkit-slider-thumb {
  width: 20px;
  height: 20px;
  margin-top: -7px;
  border: 3px solid #fdf4ff;
  border-radius: 50%;
  background: var(--accent);
  box-shadow:
    0 0 0 4px rgba(232, 121, 249, 0.2),
    0 2px 6px rgba(0, 0, 0, 0.45);
  -webkit-appearance: none;
  appearance: none;
}

input[type='range']::-moz-range-track {
  height: 6px;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.28);
}

input[type='range']::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border: 3px solid #fdf4ff;
  border-radius: 50%;
  background: var(--accent);
}

.segmented {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3px;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(2, 6, 23, 0.45);
}

.segmented button {
  min-height: 40px;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: var(--muted);
  font-size: 13.5px;
  font-weight: 600;
  transition:
    background var(--speed) var(--ease),
    color var(--speed) var(--ease),
    box-shadow var(--speed) var(--ease);
}

.segmented button[aria-pressed='true'] {
  background: var(--surface-raised);
  color: var(--text);
  box-shadow:
    0 1px 4px rgba(0, 0, 0, 0.35),
    inset 0 0 0 1px var(--accent-line);
}

.field {
  width: 100%;
  min-height: 40px;
  margin-top: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: rgba(2, 6, 23, 0.5);
  font-family: var(--mono);
  font-size: 14px;
  transition:
    border-color var(--speed) var(--ease),
    box-shadow var(--speed) var(--ease),
    opacity var(--speed) var(--ease);
}

.field:focus {
  border-color: var(--accent-line);
  outline: none;
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.field:disabled {
  opacity: 0.55;
}

.note {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 12.5px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 8px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: var(--surface);
  font-size: 14px;
  font-weight: 600;
  transition:
    background var(--speed) var(--ease),
    border-color var(--speed) var(--ease),
    color var(--speed) var(--ease);
}

.button:hover {
  border-color: var(--accent-line);
  background: var(--surface-raised);
}

.button-toggle {
  justify-content: flex-start;
  width: 100%;
  text-align: left;
}

.button-toggle[aria-pressed='true'] {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent-light);
}

.button-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

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

.field-label {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.field-label .field {
  margin-top: 4px;
}

.place-list {
  display: grid;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.place {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 6px;
  border: 1px solid transparent;
  border-radius: 12px;
  background: transparent;
  text-align: left;
  transition:
    background var(--speed) var(--ease),
    border-color var(--speed) var(--ease);
}

.place:hover {
  border-color: var(--line);
  background: rgba(148, 163, 184, 0.1);
}

.place-thumb {
  display: block;
  width: 72px;
  height: 48px;
  border-radius: 8px;
  background: var(--bg);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.06);
}

.place-text {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.place-name {
  font-size: 14px;
  font-weight: 600;
}

.place-description {
  display: -webkit-box;
  overflow: hidden;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.35;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.help {
  display: grid;
  gap: 4px;
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 13px;
}

/* Footer */
.footer {
  position: fixed;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 16;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: calc(var(--footer-h) + var(--safe-bottom));
  padding: 0 calc(var(--gap) + var(--safe-right)) var(--safe-bottom) calc(var(--gap) + var(--safe-left));
  border-top: 1px solid var(--line);
  background: var(--glass);
  color: var(--muted);
  font-size: 13px;
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.footer a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

/* Wide screens: the open drawer pushes the tools and messages aside. */
@media (min-width: 701px) {
  body.drawer-open .toolbar {
    right: calc(var(--drawer-w) + 2 * var(--gap) + var(--safe-right));
  }

  body.drawer-open .hud {
    max-width: calc(100% - var(--drawer-w) - 4 * var(--gap) - var(--safe-left) - var(--safe-right));
  }

  body.drawer-open .messages {
    left: calc((100% - var(--drawer-w) - var(--gap)) / 2);
    width: min(520px, calc(100% - var(--drawer-w) - 4 * var(--gap)));
  }
}

/* Phones: icon-only header buttons and a bottom sheet. */
@media (max-width: 700px) {
  .header-button {
    width: var(--tap);
    padding: 0;
  }

  .button-text {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }

  .drawer {
    top: auto;
    right: 0;
    bottom: 0;
    left: 0;
    width: auto;
    max-height: 72vh;
    padding-bottom: var(--safe-bottom);
    border-bottom: 0;
    border-radius: 18px 18px 0 0;
    transform: translateY(100%);
  }

  body.drawer-open .toolbar {
    opacity: 0;
    visibility: hidden;
  }

  .hud {
    right: calc(var(--gap) + var(--safe-right));
    align-items: stretch;
  }

  .preview {
    align-self: flex-start;
  }

  .info {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px 12px;
    padding: 8px 12px;
  }

  .info-center {
    grid-column: 1 / -1;
  }

  .info dd {
    font-size: 12.5px;
  }
}

/* Tall phones: on the right the tools would cover the edge of the Mandelbrot set,
   so they form a row above the info bar; the Julia preview takes their place. */
@media (max-width: 700px) and (min-height: 561px) {
  .toolbar {
    position: static;
    flex-direction: row;
    align-self: flex-start;
    transform: none;
  }

  body.picking .toolbar {
    display: none;
  }
}

/* Short screens (phones held sideways): keep the info bar clear of the tools. */
@media (max-height: 560px) {
  .hud {
    right: calc(2 * var(--gap) + var(--tap) + 14px + var(--safe-right));
  }
}

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