:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --page: #f4f6f8;
  --panel: #ffffff;
  --text: #172029;
  --muted: #607080;
  --border: #d8e0e6;
  --border-soft: #e5eaee;
  --title-bg: #eef3f6;
  --insert-bg: #dff7e9;
  --insert-strong: #b7efca;
  --insert-text: #046c4e;
  --delete-bg: #ffe4e0;
  --delete-strong: #ffc5bd;
  --delete-text: #9f1d12;
  --change-bg: #fff5d6;
  --changed-text: #9a6700;
  background: var(--page);
  color: var(--text);
}

[data-theme="dark"] {
  color-scheme: dark;
  --page: #0d1117;
  --panel: #0d1117;
  --text: #c9d1d9;
  --muted: #8b949e;
  --border: #30363d;
  --border-soft: #21262d;
  --title-bg: #161b22;
  --insert-bg: #033a16;
  --insert-strong: #196c2e;
  --insert-text: #7ee787;
  --delete-bg: #67060c;
  --delete-strong: #9e1c23;
  --delete-text: #ffa198;
  --change-bg: #3b2e00;
  --changed-text: #d29922;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  overflow: hidden;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--text);
}

.shell {
  display: grid;
  grid-template-rows: minmax(0, 1fr) 280px;
  height: 100dvh;
  min-height: 0;
  gap: 14px;
  padding: 16px;
  overflow: hidden;
}

.preview,
.inputs {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.preview {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  min-height: 0;
  overflow: hidden;
}

.preview-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}

h1,
p {
  margin: 0;
}

h1 {
  font-size: 22px;
  line-height: 1.2;
}

p {
  margin-top: 4px;
  color: var(--muted);
}

.head-tools {
  display: flex;
  align-items: center;
  gap: 12px;
  justify-content: flex-end;
}

.stats {
  display: flex;
  gap: 8px;
  font-weight: 750;
}

.stats span {
  min-width: 54px;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  text-align: center;
}

#inserted {
  color: var(--insert-text);
}

#deleted {
  color: var(--delete-text);
}

#changed {
  color: var(--changed-text);
}

.pill-toggle,
.theme-toggle {
  min-width: 76px;
  height: 34px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--title-bg);
  color: var(--text);
  font: inherit;
  font-size: 13px;
  font-weight: 750;
  cursor: pointer;
}

.pill-toggle {
  min-width: 106px;
}

.pill-toggle[aria-pressed="true"],
.theme-toggle[aria-pressed="true"] {
  border-color: var(--changed-text);
}

.diff-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  height: 100%;
  min-height: 0;
  overflow: hidden;
}

.diff-grid section {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  border-right: 1px solid var(--border);
}

.diff-grid section:last-child {
  border-right: 0;
}

.pane-title {
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--title-bg);
  font-size: 13px;
  font-weight: 750;
}

.code-pane {
  overflow: auto;
  min-height: 0;
  height: 100%;
  padding: 8px 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 13px;
  line-height: 1.5;
  user-select: text;
}

.line {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  min-height: 20px;
}

.gutter {
  padding: 0 10px;
  color: var(--muted);
  text-align: right;
  border-right: 1px solid var(--border-soft);
  user-select: none;
}

.code {
  padding: 0 12px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.line-insert .code,
.tok-insert,
.tok-change-insert {
  background: var(--insert-bg);
}

.line-delete .code,
.tok-delete,
.tok-change-delete {
  background: var(--delete-bg);
}

.line-change .code {
  background: var(--change-bg);
}

.line-gap .code {
  background: transparent;
}

.tok-change-insert,
.tok-change-delete {
  border-radius: 3px;
}

.char-char-insert,
.char-char-delete {
  border-radius: 2px;
  box-shadow: inset 0 -2px 0 currentColor;
  font-weight: 800;
}

.char-char-insert {
  color: var(--insert-text);
  background: var(--insert-strong);
}

.char-char-delete {
  color: var(--delete-text);
  background: var(--delete-strong);
}

.inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  overflow: hidden;
}

.inputs label {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  min-width: 0;
  border-right: 1px solid var(--border);
  font-size: 13px;
  font-weight: 750;
}

.inputs label:last-child {
  border-right: 0;
}

.inputs label::first-line {
  line-height: 36px;
}

textarea {
  width: 100%;
  height: 100%;
  min-height: 0;
  border: 0;
  border-top: 1px solid var(--border);
  padding: 12px;
  resize: none;
  outline: none;
  background: var(--panel);
  color: var(--text);
  font: 13px/1.5 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

label {
  padding-top: 10px;
  text-indent: 12px;
}

label textarea {
  text-indent: 0;
  margin-top: 10px;
}

@media (max-width: 820px) {
  .shell {
    grid-template-rows: minmax(420px, 1fr) 420px;
    padding: 10px;
  }

  .preview-head,
  .diff-grid,
  .inputs {
    grid-template-columns: 1fr;
  }

  .preview-head {
    display: grid;
  }

  .head-tools {
    justify-content: space-between;
  }

  .diff-grid {
    overflow: auto;
  }

  .inputs label,
  .diff-grid section {
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }
}