:root {
  --page-bg: #fbfbfa;
  --surface: #ffffff;
  --ink: #202124;
  --muted: #6f7378;
  --line: #dedfdb;
  --active-cell: #303032;
  --inactive-cell: #ededeb;
  --cell-radius: 22%;
  --tile-scale: 1;
  --panel-width: 320px;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  overflow: hidden;
  color: var(--ink);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  background: var(--page-bg);
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--panel-width);
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  opacity: 1;
  transform: scale(1);
  transition:
    opacity 720ms ease,
    transform 720ms ease;
}

.app-shell.is-intro-pending {
  opacity: 0;
  pointer-events: none;
  transform: scale(0.985);
}

.workspace {
  --editor-size: min(78vmin, 760px);

  display: grid;
  place-items: center;
  min-width: 0;
  min-height: 0;
  padding: 28px;
  overflow: hidden;
}

.grid-editor {
  display: block;
  width: var(--editor-size);
  height: var(--editor-size);
  aspect-ratio: 1;
  overflow: visible;
  touch-action: none;
  user-select: none;
}

.cell {
  stroke: transparent;
  stroke-width: 0;
  cursor: crosshair;
  transition: filter 100ms ease;
}

.cell:hover,
.cell:focus-visible {
  outline: 0;
  filter: brightness(0.96);
}

.telegram-link {
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 12;
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: rgba(251, 251, 250, 0.84);
  transition:
    background 120ms ease,
    border-color 120ms ease,
    transform 120ms ease;
}

.telegram-link:hover,
.telegram-link:focus-visible {
  border-color: var(--line);
  background: var(--surface);
  transform: translateY(-1px);
  outline: 0;
}

.telegram-link img {
  width: 24px;
  height: 24px;
  display: block;
}

.intro-screen {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  overflow: hidden;
  padding: 32px;
  background: #fbfbfa;
  color: var(--ink);
  transition:
    opacity 720ms ease,
    visibility 720ms ease;
}

.intro-screen.is-leaving {
  opacity: 0;
  visibility: hidden;
}

.intro-content {
  position: relative;
  display: grid;
  justify-items: center;
  gap: 18px;
  text-align: center;
}

.intro-title {
  min-height: 0.9em;
  margin: 0;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: clamp(34px, 7vw, 88px);
  font-weight: 800;
  line-height: 0.9;
  letter-spacing: 0;
}

@media (prefers-reduced-motion: reduce) {
  .app-shell,
  .intro-screen {
    transition-duration: 160ms;
  }
}

.control-panel {
  display: flex;
  flex-direction: column;
  gap: 22px;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 28px;
  border-left: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.82);
}

.panel-header {
  display: grid;
  gap: 8px;
}

.panel-kicker {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: 28px;
  line-height: 1.05;
}

.settings-form {
  display: grid;
  gap: 18px;
}

.control-group {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0 0 20px;
  border: 0;
  border-bottom: 1px solid var(--line);
}

.control-group:last-child {
  border-bottom: 0;
}

legend {
  margin-bottom: 2px;
  padding: 0;
  font-size: 14px;
  font-weight: 850;
}

.preset-row,
.field-row,
.mode-row,
.volume-row,
.export-row {
  display: grid;
  gap: 8px;
}

.preset-row {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.field-row,
.mode-row,
.volume-row,
.export-row {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.field {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 750;
}

.field input {
  width: 100%;
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
}

.field input[type="number"] {
  padding: 0 10px;
}

.field input[type="color"] {
  padding: 5px;
}

.field input[type="range"] {
  min-height: 28px;
  padding: 0;
  accent-color: var(--ink);
  background: transparent;
}

.button {
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  font-size: 13px;
  font-weight: 850;
  cursor: pointer;
  transition:
    background 120ms ease,
    border-color 120ms ease,
    color 120ms ease;
}

.button:hover {
  border-color: #b9bab5;
}

.button.is-selected,
.button-primary {
  border-color: var(--ink);
  background: var(--ink);
  color: #ffffff;
}

.button-full {
  width: 100%;
}

@media (max-width: 820px) {
  .app-shell {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(280px, 48vh) minmax(0, 1fr);
    grid-template-rows: minmax(280px, 48dvh) minmax(0, 1fr);
  }

  .workspace {
    --editor-size: min(92vw, calc(48vh - 36px), 680px);
    --editor-size: min(92vw, calc(48dvh - 36px), 680px);

    padding: 18px;
  }

  .grid-editor {
    width: var(--editor-size);
    height: var(--editor-size);
  }

  .control-panel {
    border-top: 1px solid var(--line);
    border-left: 0;
  }
}

@media (max-width: 520px) {
  .control-panel {
    padding: 22px 18px;
  }

  h1 {
    font-size: 24px;
  }

  .field-row {
    grid-template-columns: 1fr;
  }

  .preset-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}