style.css

/* Text Diff - dark theme, mobile first. */

:root {
  color-scheme: dark;
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-2: #273449;
  --surface-3: #2f3e57;
  --code-bg: #0c1424;
  --border: #334155;
  --border-soft: rgba(148, 163, 184, 0.16);
  --text: #e2e8f0;
  --muted: #94a3b8;
  --faint: #64748b;
  --accent: #fb923c;
  --accent-strong: #fdba74;
  --accent-ink: #2a1205;
  --accent-soft: rgba(251, 146, 60, 0.14);
  --del: #f87171;
  --del-ink: #fecaca;
  --del-bg: rgba(248, 113, 113, 0.11);
  --del-num: rgba(248, 113, 113, 0.07);
  --del-hl: rgba(248, 113, 113, 0.38);
  --add: #4ade80;
  --add-ink: #bbf7d0;
  --add-bg: rgba(74, 222, 128, 0.1);
  --add-num: rgba(74, 222, 128, 0.06);
  --add-hl: rgba(74, 222, 128, 0.32);
  --chg: #fbbf24;
  --hunk: #7dd3fc;
  --radius: 12px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgba(2, 6, 23, 0.4), 0 10px 30px rgba(2, 6, 23, 0.35);
  --speed: 180ms;
  --font: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
  --mono: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas, 'Liberation Mono', monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 var(--font);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

a:focus-visible,
button:focus-visible,
select:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.app {
  width: 100%;
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 16px 20px;
}

/* ---------- header ---------- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.logo {
  flex: none;
  border-radius: 9px;
  box-shadow: 0 4px 14px rgba(251, 146, 60, 0.25);
}

.brand h1 {
  margin: 0;
  font-size: 21px;
  font-weight: 750;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.tagline {
  display: none;
  margin: 0 0 0 6px;
  padding-left: 14px;
  border-left: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.top-actions {
  display: flex;
  gap: 8px;
  flex: none;
}

/* ---------- buttons ---------- */

.icon {
  width: 18px;
  height: 18px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-2);
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.2;
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
  transition:
    background-color var(--speed),
    border-color var(--speed),
    color var(--speed),
    transform var(--speed);
}

.btn:hover:not(:disabled) {
  background: var(--surface-3);
  border-color: #475569;
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn.small {
  padding: 0 12px;
  font-size: 13.5px;
}

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

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

.btn.icon-only {
  width: 40px;
  padding: 0;
}

.btn.lang {
  width: 48px;
  padding: 0;
  font-weight: 750;
  letter-spacing: 0.04em;
}

/* ---------- cards ---------- */

.card {
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* ---------- input panes ---------- */

.panes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: 14px 14px 12px;
}

.pane {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.pane-head {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 40px;
}

.pane-title {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.pane-meta {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.text {
  display: block;
  width: 100%;
  height: clamp(7.5rem, 22vh, 18rem);
  min-height: 6rem;
  margin: 0;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--code-bg);
  color: var(--text);
  font: 13px/1.55 var(--mono);
  tab-size: 4;
  resize: vertical;
  transition:
    border-color var(--speed),
    box-shadow var(--speed);
}

.text::placeholder {
  color: var(--faint);
}

.text:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.drop-hint {
  position: absolute;
  inset: 48px 0 0;
  display: none;
  place-items: center;
  padding: 12px;
  border: 2px dashed var(--accent);
  border-radius: 10px;
  background: rgba(15, 23, 42, 0.86);
  color: var(--accent);
  font-weight: 700;
  text-align: center;
  pointer-events: none;
}

.pane.dragging .drop-hint {
  display: grid;
}

.patch-zone .drop-hint {
  inset: 0;
}

.swap-col {
  display: flex;
  justify-content: center;
}

.swap .icon {
  transform: rotate(90deg);
}

/* ---------- options ---------- */

.options {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
  padding: 12px 14px 14px;
  border-top: 1px solid var(--border-soft);
}

.field {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 14px;
}

.select,
.number {
  min-height: 40px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background-color: var(--surface-2);
  color: var(--text);
  font-size: 14px;
  transition: border-color var(--speed);
}

.select {
  appearance: none;
  padding: 0 34px 0 12px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 11px center;
  background-size: 14px;
  cursor: pointer;
}

.select option {
  background: var(--surface);
  color: var(--text);
}

.number {
  width: 64px;
  padding: 0 8px 0 12px;
}

.select:hover,
.number:hover {
  border-color: #475569;
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 40px;
  padding: 0 13px 0 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-2);
  font-size: 14px;
  cursor: pointer;
  user-select: none;
  transition:
    background-color var(--speed),
    border-color var(--speed);
}

.toggle:hover {
  border-color: #475569;
}

.toggle:has(input:checked) {
  border-color: rgba(251, 146, 60, 0.55);
  background: var(--accent-soft);
}

.toggle input {
  position: relative;
  flex: none;
  width: 30px;
  height: 18px;
  margin: 0;
  border-radius: 999px;
  background: #475569;
  appearance: none;
  cursor: pointer;
  transition: background-color var(--speed);
}

.toggle input::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #e2e8f0;
  transition: transform var(--speed);
}

.toggle input:checked {
  background: var(--accent);
}

.toggle input:checked::after {
  background: #fff7ed;
  transform: translateX(12px);
}

/* ---------- result card ---------- */

.result {
  margin-top: 16px;
}

.result-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border-soft);
  border-radius: var(--radius) var(--radius) 0 0;
  background: rgba(30, 41, 59, 0.94);
  backdrop-filter: blur(8px);
}

@media (min-height: 520px) {
  .result-bar {
    position: sticky;
    top: 0;
    z-index: 10;
  }
}

.tabs {
  display: flex;
  flex: 1 1 100%;
  gap: 2px;
  padding: 3px;
  border-radius: 11px;
  background: var(--code-bg);
}

.tab {
  flex: 1 1 auto;
  min-height: 40px;
  padding: 0 10px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
  transition:
    background-color var(--speed),
    color var(--speed),
    box-shadow var(--speed);
}

.tab:hover {
  color: var(--text);
}

.tab[aria-selected='true'] {
  background: var(--surface-2);
  color: var(--text);
  box-shadow:
    inset 0 -2px 0 var(--accent),
    0 1px 3px rgba(2, 6, 23, 0.5);
}

.stats {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 12px;
  color: var(--muted);
  font-size: 13px;
}

.stat {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.stat-label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.stat-value {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.stat.add .stat-value {
  color: var(--add);
}

.stat.del .stat-value {
  color: var(--del);
}

.stat.chg .stat-value {
  color: var(--chg);
}

.stat.sim .stat-value {
  color: var(--accent);
}

.meter {
  display: none;
  width: 54px;
  height: 6px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--border);
}

.meter-fill {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #f97316, var(--accent-strong));
  transition: width 240ms ease;
}

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.counter {
  padding: 0 6px;
  color: var(--muted);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  text-align: center;
  white-space: nowrap;
}

.notice {
  margin: 0;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border-soft);
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 14px;
  font-weight: 600;
}

.empty {
  display: grid;
  justify-items: center;
  gap: 8px;
  padding: 36px 18px 40px;
  text-align: center;
}

.empty-art {
  margin-bottom: 6px;
}

.empty h2 {
  margin: 0;
  font-size: 18px;
}

.empty p {
  max-width: 34em;
  margin: 0 0 10px;
  color: var(--muted);
}

/* ---------- diff views ---------- */

.panel {
  border-radius: 0 0 var(--radius) var(--radius);
}

.diff {
  --num-w: 4ch;
  padding: 6px 0 8px;
  background: var(--code-bg);
  font: 13px/1.6 var(--mono);
  tab-size: 4;
}

.row {
  display: grid;
  grid-template-columns: var(--num-w) minmax(0, 1fr) var(--num-w) minmax(0, 1fr);
  transition: box-shadow var(--speed);
}

.inline .row {
  grid-template-columns: var(--num-w) var(--num-w) 1.8em minmax(0, 1fr);
}

.row[data-change] {
  cursor: pointer;
}

.row.current {
  box-shadow: inset 3px 0 0 var(--accent);
}

.row.current .num {
  color: var(--accent-strong);
}

.num {
  padding: 0 8px 0 4px;
  color: var(--faint);
  text-align: right;
  font-variant-numeric: tabular-nums;
  user-select: none;
}

.code {
  min-width: 0;
  min-height: 1.6em;
  padding: 0 12px 0 10px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.split .row > .code:nth-child(2) {
  border-right: 1px solid var(--border-soft);
}

.num.del {
  background: var(--del-num);
  color: #fca5a5;
}

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

.num.add {
  background: var(--add-num);
  color: #86efac;
}

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

.code.none {
  background: repeating-linear-gradient(-45deg, transparent 0 7px, rgba(148, 163, 184, 0.05) 7px 14px);
}

.num.none {
  background: rgba(148, 163, 184, 0.025);
}

.code.ignored,
.sign.ignored {
  color: var(--faint);
}

.sign {
  color: var(--faint);
  text-align: center;
  user-select: none;
}

.sign.del {
  background: var(--del-bg);
  color: var(--del);
}

.sign.add {
  background: var(--add-bg);
  color: var(--add);
}

del,
ins {
  border-radius: 3px;
  color: inherit;
  text-decoration: none;
}

del {
  background: var(--del-hl);
}

ins {
  background: var(--add-hl);
}

.eol {
  padding: 0 2px;
  color: var(--muted);
}

/* ---------- patch views ---------- */

.panel-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 14px;
}

.panel-heading {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-width: 0;
}

.panel-title {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
}

.panel-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.muted {
  color: var(--muted);
  font-size: 13px;
}

.patch,
.outcome-text {
  margin: 0;
  padding: 8px 0 10px;
  background: var(--code-bg);
  font: 13px/1.6 var(--mono);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  tab-size: 4;
}

.panel > .patch {
  border-radius: 0 0 var(--radius) var(--radius);
}

.outcome-text {
  padding: 10px 14px;
  border: 1px solid var(--border-soft);
  border-radius: 10px;
}

.outcome-text.is-patch {
  padding: 8px 0;
}

.pl {
  display: block;
  min-height: 1.6em;
  padding: 0 14px;
}

.pl.file {
  color: var(--text);
  font-weight: 700;
}

.pl.meta,
.pl.note {
  color: var(--muted);
  font-style: italic;
}

.pl.hunk {
  margin-top: 4px;
  background: rgba(125, 211, 252, 0.08);
  color: var(--hunk);
}

.pl.add {
  background: var(--add-bg);
  color: var(--add-ink);
}

.pl.del {
  background: var(--del-bg);
  color: var(--del-ink);
}

.pl.context {
  color: #cbd5e1;
}

.panel-empty {
  margin: 0;
  padding: 4px 16px 22px;
  color: var(--muted);
}

.apply-body {
  display: grid;
  gap: 10px;
  padding: 0 14px 16px;
}

.patch-input {
  height: clamp(9rem, 28vh, 22rem);
}

.hint {
  margin: -2px 0 0;
  color: var(--faint);
  font-size: 13px;
}

.apply-outcome {
  display: grid;
  gap: 10px;
}

.status {
  margin: 0;
  padding: 10px 14px;
  border-left: 3px solid;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
}

.status.ok {
  border-color: var(--add);
  background: var(--add-bg);
  color: var(--add-ink);
}

.status.error {
  border-color: var(--del);
  background: var(--del-bg);
  color: var(--del-ink);
}

.outcome-title {
  margin: 4px 0 0;
  font-size: 14px;
  font-weight: 700;
}

/* ---------- footer and toast ---------- */

.footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0 18px;
  padding: 14px 0 0;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

.footer a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
}

.keys {
  display: none;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 18px;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 12px;
  width: max-content;
  max-width: calc(100vw - 32px);
  padding: 8px 8px 8px 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #0b1220;
  box-shadow: var(--shadow);
  font-size: 14px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translate(-50%, 12px);
  transition:
    opacity var(--speed),
    transform var(--speed),
    visibility var(--speed);
}

.toast.show {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translate(-50%, 0);
}

#toast-text {
  min-width: 0;
  padding: 8px 0;
}

/* ---------- wider screens ---------- */

@media (min-width: 641px) {
  .panes {
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    gap: 12px;
  }

  .swap-col {
    align-items: center;
    padding-top: 48px;
  }

  .swap {
    width: 40px;
    padding: 0;
  }

  .swap .icon {
    transform: none;
  }

  .swap-label {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }

  .tabs {
    flex: 0 1 auto;
  }

  .tab {
    padding: 0 14px;
  }

  .stat-label {
    position: static;
    width: auto;
    height: auto;
    overflow: visible;
    clip-path: none;
  }

  .meter {
    display: block;
  }

  .counter {
    min-width: 92px;
  }

  .keys {
    display: inline;
  }
}

@media (min-width: 900px) {
  .tagline {
    display: block;
  }
}

/* ---------- phones ---------- */

@media (max-width: 640px) {
  #tab-split {
    display: none;
  }

  .diff,
  .patch,
  .outcome-text,
  .text {
    font-size: 12.5px;
  }

  .num {
    padding-right: 6px;
  }

  .code {
    padding: 0 8px 0 6px;
  }

  .pl {
    padding: 0 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
    animation: none !important;
  }
}