:root {
  color-scheme: light;
  --bg: #f7f8fb;
  --panel: #ffffff;
  --panel-2: #f1f5f9;
  --text: #172033;
  --muted: #64748b;
  --border: #d7dde8;
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --add-bg: #dcfce7;
  --add-line: #16a34a;
  --del-bg: #fee2e2;
  --del-line: #dc2626;
  --change-bg: #fff7d6;
  --marker: #94a3b8;
  --code: #111827;
  --token-keyword: #7c3aed;
  --token-string: #047857;
  --token-number: #b45309;
  --token-comment: #64748b;
  --token-tag: #0f766e;
  --shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #111827;
    --panel: #1f2937;
    --panel-2: #273449;
    --text: #f8fafc;
    --muted: #a7b2c4;
    --border: #39465b;
    --accent: #60a5fa;
    --accent-strong: #93c5fd;
    --add-bg: #11351f;
    --add-line: #22c55e;
    --del-bg: #3f1518;
    --del-line: #f87171;
    --change-bg: #3a3218;
    --marker: #94a3b8;
    --code: #f8fafc;
    --token-keyword: #c4b5fd;
    --token-string: #86efac;
    --token-number: #fbbf24;
    --token-comment: #a7b2c4;
    --token-tag: #5eead4;
    --shadow: 0 16px 40px rgba(0, 0, 0, 0.28);
  }
}

html[data-theme="light"] {
  color-scheme: light;
  --bg: #f7f8fb;
  --panel: #ffffff;
  --panel-2: #f1f5f9;
  --text: #172033;
  --muted: #64748b;
  --border: #d7dde8;
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --add-bg: #dcfce7;
  --add-line: #16a34a;
  --del-bg: #fee2e2;
  --del-line: #dc2626;
  --change-bg: #fff7d6;
  --code: #111827;
  --token-keyword: #7c3aed;
  --token-string: #047857;
  --token-number: #b45309;
  --token-comment: #64748b;
  --token-tag: #0f766e;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #111827;
  --panel: #1f2937;
  --panel-2: #273449;
  --text: #f8fafc;
  --muted: #a7b2c4;
  --border: #39465b;
  --accent: #60a5fa;
  --accent-strong: #93c5fd;
  --add-bg: #11351f;
  --add-line: #22c55e;
  --del-bg: #3f1518;
  --del-line: #f87171;
  --change-bg: #3a3218;
  --code: #f8fafc;
  --token-keyword: #c4b5fd;
  --token-string: #86efac;
  --token-number: #fbbf24;
  --token-comment: #a7b2c4;
  --token-tag: #5eead4;
}

html[data-theme="contrast"] {
  color-scheme: dark;
  --bg: #000000;
  --panel: #000000;
  --panel-2: #111111;
  --text: #ffffff;
  --muted: #ffffff;
  --border: #ffffff;
  --accent: #ffff00;
  --accent-strong: #ffff00;
  --add-bg: #003b00;
  --add-line: #00ff5a;
  --del-bg: #4b0000;
  --del-line: #ff7070;
  --change-bg: #403900;
  --marker: #ffffff;
  --code: #ffffff;
  --token-keyword: #00ffff;
  --token-string: #00ff5a;
  --token-number: #ffff00;
  --token-comment: #d4d4d4;
  --token-tag: #ff9eff;
  --shadow: none;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.5 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

button,
.file-button {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  min-height: 38px;
  padding: 8px 12px;
  border-radius: 7px;
  cursor: pointer;
}

button:hover,
.file-button:hover {
  border-color: var(--accent);
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
.file-button:focus-within {
  outline: 3px solid color-mix(in srgb, var(--accent) 35%, transparent);
  outline-offset: 2px;
}

button.primary,
.segmented button.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

html[data-theme="contrast"] button.primary,
html[data-theme="contrast"] .segmented button.active {
  color: #000000;
}

.app-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 28px 14px;
}

.app-header h1 {
  margin: 0;
  font-size: clamp(1.5rem, 2.6vw, 2.25rem);
  letter-spacing: 0;
}

.app-header p,
.panel-heading p {
  margin: 4px 0 0;
  color: var(--muted);
}

.header-actions,
.controls,
.options,
.status-row,
.diff-toolbar,
.nav-actions,
.url-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

main {
  padding: 0 28px 28px;
}

.input-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 16px;
}

.input-panel,
.controls,
.options,
.status-row,
.navigator,
.diff-shell {
  background: var(--panel);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.input-panel {
  min-width: 0;
  border-radius: 8px;
  padding: 14px;
}

.input-panel.dragover {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, var(--panel));
}

.panel-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.panel-heading h2,
.navigator h2 {
  margin: 0;
  font-size: 1rem;
}

.file-button {
  position: relative;
  display: inline-flex;
  align-items: center;
  overflow: hidden;
}

.file-button input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

textarea {
  width: 100%;
  min-height: 220px;
  resize: vertical;
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 10px;
  background: var(--panel-2);
  color: var(--text);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

.url-row {
  margin-top: 10px;
}

.url-row input,
.field select {
  min-height: 38px;
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 7px 10px;
  background: var(--panel-2);
  color: var(--text);
}

.url-row input {
  flex: 1 1 220px;
}

.controls,
.options,
.status-row {
  margin-top: 16px;
  padding: 12px;
  border-radius: 8px;
}

.controls {
  justify-content: space-between;
}

.segmented {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.segmented button {
  border: 0;
  border-radius: 0;
  min-height: 36px;
}

.field {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.field span {
  color: var(--muted);
  font-size: 0.9rem;
}

.compact select {
  max-width: 150px;
}

.options label {
  display: inline-flex;
  gap: 7px;
  align-items: center;
  min-height: 30px;
}

.status-row {
  justify-content: space-between;
}

.summary {
  display: grid;
  grid-template-columns: repeat(4, minmax(120px, auto));
  gap: 10px;
}

.summary span {
  padding: 7px 10px;
  border-radius: 7px;
  background: var(--panel-2);
}

.progress {
  align-items: center;
  color: var(--muted);
}

.progress span {
  width: 18px;
  height: 18px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.workspace {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 16px;
  margin-top: 16px;
  align-items: start;
}

.navigator,
.diff-shell {
  border-radius: 8px;
}

.navigator {
  position: sticky;
  top: 10px;
  padding: 12px;
  max-height: calc(100vh - 20px);
  overflow: auto;
}

.nav-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin-bottom: 14px;
}

.change-list,
.history-list {
  display: grid;
  gap: 8px;
  margin: 8px 0 18px;
}

.change-card {
  border: 1px solid var(--border);
  background: var(--panel-2);
  border-radius: 7px;
  padding: 9px;
  text-align: left;
}

.change-card.active {
  border-color: var(--accent);
  box-shadow: inset 3px 0 0 var(--accent);
}

.change-card strong {
  display: block;
}

.change-card span {
  color: var(--muted);
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.diff-shell {
  min-width: 0;
  overflow: hidden;
}

.diff-toolbar {
  position: sticky;
  top: 0;
  z-index: 6;
  padding: 10px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.empty-state {
  padding: 48px 20px;
  color: var(--muted);
  text-align: center;
}

.diff-output {
  display: none;
  max-height: 72vh;
  overflow: auto;
  background: var(--panel);
  color: var(--code);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 13px;
  line-height: 1.45;
}

.diff-output.visible {
  display: block;
}

.diff-output:not(.wrap) .code,
.diff-output:not(.wrap) .line-text {
  white-space: pre;
}

.diff-output.wrap .code,
.diff-output.wrap .line-text {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.side-scrolls {
  display: grid;
  grid-template-columns: minmax(420px, 1fr) minmax(420px, 1fr);
  min-width: 860px;
  max-height: 72vh;
}

.side-pane {
  overflow: auto;
  border-right: 1px solid var(--border);
}

.side-pane:last-child {
  border-right: 0;
}

.side-pane-header,
.side-pane-row {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
}

.side-pane-header {
  position: sticky;
  top: 0;
  z-index: 5;
  background: var(--panel-2);
  border-bottom: 1px solid var(--border);
  font-weight: 700;
}

.side-pane-header div {
  padding: 9px 10px;
}

.side-pane-row,
.uni-row {
  border-bottom: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
}

.side-pane-row.add .right-code,
.uni-row.add {
  background: var(--add-bg);
}

.side-pane-row.delete .left-code,
.uni-row.delete {
  background: var(--del-bg);
}

.side-pane-row.modify .left-code,
.side-pane-row.modify .right-code {
  background: var(--change-bg);
}

.line-no,
.prefix {
  user-select: none;
  color: var(--muted);
  background: var(--panel-2);
  text-align: right;
  padding: 3px 8px;
  border-right: 1px solid var(--border);
}

.code,
.line-text {
  min-width: 0;
  padding: 3px 10px;
}

.left-code,
.right-code,
.uni-row {
  position: relative;
}

.left-code::before,
.right-code::before,
.uni-row::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: transparent;
}

.side-pane-row.add .right-code::before,
.uni-row.add::before {
  background: var(--add-line);
}

.side-pane-row.delete .left-code::before,
.uni-row.delete::before {
  background: var(--del-line);
}

.side-pane-row.modify .left-code::before,
.side-pane-row.modify .right-code::before {
  background: var(--marker);
}

.inline-add {
  background: color-mix(in srgb, var(--add-line) 28%, transparent);
  border-radius: 3px;
}

.inline-del {
  background: color-mix(in srgb, var(--del-line) 28%, transparent);
  border-radius: 3px;
}

.unified {
  min-width: 720px;
}

.uni-row {
  display: grid;
  grid-template-columns: 48px 58px 58px minmax(0, 1fr);
}

.hunk {
  display: block;
  padding: 7px 10px;
  background: color-mix(in srgb, var(--accent) 14%, var(--panel));
  color: var(--accent-strong);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  font-weight: 700;
}

.collapsed {
  width: 100%;
  display: block;
  border: 0;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  background: var(--panel-2);
  color: var(--muted);
  text-align: center;
  padding: 8px;
}

.tok-keyword {
  color: var(--token-keyword);
  font-weight: 700;
}

.tok-string {
  color: var(--token-string);
}

.tok-number {
  color: var(--token-number);
}

.tok-comment {
  color: var(--token-comment);
  font-style: italic;
}

.tok-tag {
  color: var(--token-tag);
}

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  max-width: min(420px, calc(100vw - 36px));
  padding: 10px 12px;
  border-radius: 7px;
  background: var(--text);
  color: var(--panel);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity 160ms ease, transform 160ms ease;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 980px) {
  .app-header,
  .input-grid,
  .workspace {
    grid-template-columns: 1fr;
  }

  .app-header {
    display: grid;
  }

  .navigator {
    position: static;
    max-height: none;
  }
}

@media (max-width: 640px) {
  main,
  .app-header {
    padding-left: 14px;
    padding-right: 14px;
  }

  .summary {
    grid-template-columns: 1fr 1fr;
    width: 100%;
  }

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

  .field select,
  .controls button.primary {
    flex: 1;
  }

  .diff-output {
    max-height: 68vh;
  }
}