:root {
  color-scheme: light;
  --bg: #f5f5f7;
  --fg: #1d1d1f;
  --muted: #6e6e73;
  --soft: #86868b;
  --panel: #ffffff;
  --panel-subtle: #fbfbfd;
  --border: #d2d2d7;
  --border-strong: #b9b9c0;
  --accent: #0071e3;
  --accent-strong: #005bb5;
  --accent-fg: #ffffff;
  --danger: #c42b1c;
  --success: #248a3d;
  --shadow: 0 18px 50px rgb(0 0 0 / 8%);
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #111113;
  --fg: #f5f5f7;
  --muted: #a1a1a6;
  --soft: #7d7d84;
  --panel: #1c1c1e;
  --panel-subtle: #171719;
  --border: #38383f;
  --border-strong: #4a4a52;
  --accent: #0a84ff;
  --accent-strong: #409cff;
  --accent-fg: #ffffff;
  --danger: #ff6961;
  --success: #30d158;
  --shadow: 0 18px 60px rgb(0 0 0 / 24%);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #111113;
    --fg: #f5f5f7;
    --muted: #a1a1a6;
    --soft: #7d7d84;
    --panel: #1c1c1e;
    --panel-subtle: #171719;
    --border: #38383f;
    --border-strong: #4a4a52;
    --accent: #0a84ff;
    --accent-strong: #409cff;
    --accent-fg: #ffffff;
    --danger: #ff6961;
    --success: #30d158;
    --shadow: 0 18px 60px rgb(0 0 0 / 24%);
  }
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgb(0 113 227 / 10%), transparent 32rem),
    var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  transition:
    background-color 180ms ease,
    color 180ms ease;
}

button,
select,
textarea {
  font: inherit;
}

button {
  -webkit-tap-highlight-color: transparent;
}

.app-shell {
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr);
  gap: 16px;
  min-height: 100vh;
  padding: 24px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: min(100%, 1440px);
  margin: 0 auto;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.2;
}

h1,
h2 {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  font-size: 1.65rem;
  line-height: 1.1;
}

h2 {
  font-size: 0.98rem;
  line-height: 1.2;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: min(100%, 1440px);
  margin: 0 auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: color-mix(in srgb, var(--panel) 86%, transparent);
  box-shadow: var(--shadow);
  padding: 8px;
  backdrop-filter: blur(18px);
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.select-control {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 36px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel-subtle);
  padding: 0 10px;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 600;
}

.select-control select {
  min-height: 28px;
  border: 0;
  background: transparent;
  color: var(--fg);
  cursor: pointer;
  font-weight: 650;
}

.button,
.icon-button {
  display: inline-grid;
  place-items: center;
  min-height: 36px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel-subtle);
  color: var(--fg);
  cursor: pointer;
  transition:
    background-color 160ms ease,
    border-color 160ms ease,
    color 160ms ease,
    transform 160ms ease;
}

.button {
  min-width: 84px;
  padding: 0 14px;
  font-size: 0.9rem;
  font-weight: 600;
}

.button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-fg);
}

.button.quiet {
  color: var(--muted);
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.52;
  transform: none;
}

.icon-button {
  width: 40px;
  padding: 0;
  font-size: 1rem;
}

.button:not(:disabled):hover,
.icon-button:hover {
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.button.primary:not(:disabled):hover {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
}

.button:focus-visible,
.icon-button:focus-visible,
.select-control:focus-within,
.editor:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 32%, transparent);
  outline-offset: 2px;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 16px;
  width: min(100%, 1440px);
  min-height: 0;
  margin: 0 auto;
}

.editor-panel {
  display: grid;
  grid-template-rows: auto minmax(360px, 1fr) auto;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.panel-header,
.panel-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
}

.panel-header {
  border-bottom: 1px solid var(--border);
}

.panel-header p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.3;
}

.panel-footer {
  min-height: 44px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.78rem;
}

.status-pill {
  flex: 0 0 auto;
  border: 1px solid color-mix(in srgb, var(--accent) 28%, var(--border));
  border-radius: 999px;
  padding: 5px 9px;
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 700;
  line-height: 1;
}

.status-pill.muted {
  border-color: var(--border);
  color: var(--muted);
}

.status-pill.success {
  border-color: color-mix(in srgb, var(--success) 38%, var(--border));
  color: var(--success);
}

.status-pill.error {
  border-color: color-mix(in srgb, var(--danger) 38%, var(--border));
  color: var(--danger);
}

.editor {
  display: block;
  width: 100%;
  min-width: 0;
  height: 100%;
  resize: none;
  border: 0;
  background: var(--panel-subtle);
  color: var(--fg);
  padding: 16px;
  font-family: var(--mono);
  font-size: 0.92rem;
  line-height: 1.55;
  tab-size: 2;
}

.editor::placeholder {
  color: var(--soft);
}

.editor.output {
  color: color-mix(in srgb, var(--fg) 92%, var(--accent));
}

.editor.has-error {
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--danger) 60%, transparent);
}

.message {
  width: min(100%, 1440px);
  min-height: 20px;
  margin: -4px auto 0;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.4;
}

.message.success {
  color: var(--success);
}

.message.error {
  color: var(--danger);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

@media (max-width: 860px) {
  .app-shell {
    grid-template-rows: auto auto auto;
    padding: 16px;
  }

  .topbar {
    align-items: flex-start;
  }

  .toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  .select-control {
    justify-content: space-between;
    width: 100%;
  }

  .toolbar-group {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .toolbar-group + .toolbar-group {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .button {
    width: 100%;
    min-width: 0;
  }

  .workspace {
    grid-template-columns: 1fr;
  }

  .editor-panel {
    grid-template-rows: auto minmax(300px, 48vh) auto;
  }
}

@media (max-width: 520px) {
  .app-shell {
    gap: 12px;
    padding: 12px;
  }

  h1 {
    font-size: 1.35rem;
  }

  .panel-header,
  .panel-footer {
    padding: 12px;
  }

  .toolbar-group,
  .toolbar-group + .toolbar-group {
    grid-template-columns: 1fr;
  }
}