:root {
  color-scheme: light;
  --bg-base: #f5f7fb;
  --bg-surface: rgba(255, 255, 255, 0.78);
  --bg-surface-strong: rgba(255, 255, 255, 0.7);
  --bg-accent-1: rgba(59, 130, 246, 0.18);
  --bg-accent-2: rgba(16, 185, 129, 0.14);
  --text: #122033;
  --muted: #5d6d82;
  --line: rgba(15, 23, 42, 0.12);
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --success: #166534;
  --danger: #b91c1c;
  --neutral: #475569;
  --shadow: 0 24px 70px rgba(15, 23, 42, 0.12);
  --font-sans: "Space Grotesk", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg-base: #0b1120;
  --bg-surface: rgba(15, 23, 42, 0.82);
  --bg-surface-strong: rgba(8, 15, 28, 0.74);
  --bg-accent-1: rgba(96, 165, 250, 0.2);
  --bg-accent-2: rgba(52, 211, 153, 0.16);
  --text: #eff4ff;
  --muted: #b7c3d8;
  --line: rgba(255, 255, 255, 0.12);
  --success: #4ade80;
  --danger: #f87171;
  --neutral: #cbd5e1;
  --shadow: 0 24px 80px rgba(2, 6, 23, 0.42);
}

* {
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-sans);
  color: var(--text);
  background:
    radial-gradient(circle at top left, var(--bg-accent-1), transparent 28%),
    radial-gradient(circle at bottom right, var(--bg-accent-2), transparent 30%),
    linear-gradient(180deg, color-mix(in srgb, var(--bg-base) 88%, white 12%), var(--bg-base));
  background-attachment: fixed;
}

.shell {
  width: min(1380px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1.2rem 0 2rem;
}

.site-toolbar {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 0.75rem;
}

.panel,
.glass-panel,
.glass-card {
  background: var(--bg-surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.panel,
.glass-panel {
  border-radius: 28px;
}

.glass-card {
  border-radius: 24px;
}

.hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  align-items: start;
}

.hero h1,
.panel-header h2,
.card-header h2,
.card-header h3 {
  margin: 0;
}

.hero h1 {
  max-width: 12ch;
  font-size: clamp(2.4rem, 7vw, 5rem);
  line-height: 0.95;
}

.eyebrow,
.panel-kicker {
  margin: 0 0 0.75rem;
  color: var(--accent);
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.lede {
  margin: 1rem 0 0;
  max-width: 60ch;
  color: var(--muted);
  line-height: 1.7;
}

.pill,
.summary-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.72rem 0.95rem;
  border-radius: 999px;
  font-size: 0.92rem;
  background: var(--bg-surface-strong);
  border: 1px solid var(--line);
}

.button,
select,
textarea {
  font: inherit;
}

.button {
  padding: 0.85rem 1rem;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: var(--bg-surface-strong);
  color: var(--text);
  cursor: pointer;
  transition: transform 140ms ease, background 140ms ease, border-color 140ms ease;
}

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

.button.primary {
  color: white;
  border-color: transparent;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
}

.button.ghost {
  background: color-mix(in srgb, var(--bg-surface-strong) 70%, transparent);
}

.button.subtle {
  background: color-mix(in srgb, var(--bg-surface-strong) 35%, transparent);
}

.small-button {
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  font-size: 0.84rem;
}

.theme-toggle {
  min-width: 132px;
  white-space: nowrap;
  border-radius: 999px;
}

.theme-toggle::before {
  content: "";
  display: inline-block;
  width: 0.8rem;
  height: 0.8rem;
  margin-right: 0.55rem;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.8;
  vertical-align: -0.05rem;
}

.field,
.editor-card,
.pane,
.toggle {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.field span,
.editor-label,
.pane-label,
.pane-title,
.toggle span {
  color: var(--muted);
  font-size: 0.92rem;
}

.toggle {
  flex-direction: row;
  align-items: center;
}

.pane-top,
.panel-header,
.toolbar,
.button-row,
.actions,
.summary-row,
.diff-toolbar,
.tree-actions,
.tool-row,
.controls-top {
  display: flex;
  gap: 0.9rem;
}

.pane-top,
.panel-header,
.summary-row,
.tool-row,
.controls-top {
  justify-content: space-between;
  align-items: center;
}

.actions,
.button-row,
.toolbar,
.tree-actions {
  flex-wrap: wrap;
}

select,
textarea,
.output-block {
  color: var(--text);
}

select {
  min-width: 150px;
  padding: 0.8rem 0.9rem;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: var(--bg-surface-strong);
}

.code-shell {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: stretch;
  overflow: hidden;
  border-radius: 22px;
  border: 1px solid var(--line);
  background: var(--bg-surface-strong);
}

.editor-shell {
  min-height: 320px;
  resize: vertical;
}

.line-numbers {
  min-width: 3.5rem;
  padding: 1rem 0.75rem 1rem 0.9rem;
  text-align: right;
  color: var(--muted);
  background: color-mix(in srgb, var(--bg-surface-strong) 85%, white 15%);
  border-right: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.92rem;
  line-height: 1.6;
  user-select: none;
  white-space: pre;
  overflow: hidden;
  align-self: stretch;
}

.line-number-list {
  will-change: transform;
}

.line-number {
  display: block;
  height: 1.6em;
  line-height: 1.6;
}

textarea,
.output-block {
  min-height: 100%;
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 1rem;
  border: 0;
  border-radius: 0;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  line-height: 1.6;
  background: transparent;
  white-space: pre;
  overflow-wrap: normal;
  word-break: normal;
  overflow-x: auto;
  overflow-y: auto;
}

textarea {
  resize: none;
}

.status {
  margin-top: 1rem;
  min-height: 1.5rem;
  color: var(--muted);
}

.status.is-success {
  color: var(--success);
}

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

.summary-pill.added {
  color: var(--success);
}

.summary-pill.removed {
  color: var(--danger);
}

.summary-pill.neutral {
  color: var(--neutral);
}

.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;
}

@media (max-width: 1080px) {
  .hero {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .shell {
    width: min(100% - 1rem, 1380px);
    padding-top: 0.5rem;
  }

  .panel-header,
  .summary-row,
  .tool-row,
  .controls-top,
  .pane-top {
    align-items: flex-start;
    flex-direction: column;
  }
}