/* Diffscope styles — calm professional instrument, light & dark themes */

:root {
  --bg: #f4f6f9;
  --panel: #ffffff;
  --panel-2: #eef1f5;
  --border: #d9dee7;
  --border-strong: #c3cad6;
  --text: #1f2430;
  --muted: #6a7280;
  --accent: #2f6fed;
  --accent-soft: rgba(47, 111, 237, 0.12);

  --del-bg: #fdeceb;
  --del-hl: #ffc9c4;
  --del-text: #8f1d16;
  --del-num: #f6d5d2;
  --del-bar: #d1342c;

  --ins-bg: #e2f4e8;
  --ins-hl: #a9e6bd;
  --ins-text: #145c2e;
  --ins-num: #c9ecd4;
  --ins-bar: #1f8a44;

  --gap-bg: #eef1f6;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --rowh: 21px;
  --radius: 8px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.05), 0 1px 3px rgba(16, 24, 40, 0.07);
  color-scheme: light;
}

html[data-theme="dark"] {
  --bg: #0d1117;
  --panel: #161b22;
  --panel-2: #1c2330;
  --border: #2c333f;
  --border-strong: #3d4452;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #5b8def;
  --accent-soft: rgba(91, 141, 239, 0.16);

  --del-bg: rgba(248, 81, 73, 0.14);
  --del-hl: rgba(248, 81, 73, 0.35);
  --del-text: #ffa39e;
  --del-num: rgba(248, 81, 73, 0.24);
  --del-bar: #f85149;

  --ins-bg: rgba(63, 185, 80, 0.14);
  --ins-hl: rgba(63, 185, 80, 0.35);
  --ins-text: #7ee2a0;
  --ins-num: rgba(63, 185, 80, 0.24);
  --ins-bar: #3fb950;

  --gap-bg: #161c26;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 14px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.noscript {
  padding: 16px 20px;
  background: var(--del-bg);
  color: var(--del-text);
  font-weight: 600;
}

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

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 18px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

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

.brand-mark { flex: none; }
.mark-bg { fill: var(--text); }
.mark-del { fill: var(--del-bar); }
.mark-ins { fill: var(--ins-bar); }
.mark-eq { fill: var(--muted); opacity: 0.6; }

.brand-text h1 {
  margin: 0;
  font-size: 17px;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.tagline {
  margin: 0;
  font-size: 12px;
  color: var(--muted);
}

.header-right { display: flex; align-items: center; gap: 12px; }

.privacy-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--ins-text);
  background: var(--ins-bg);
  border: 1px solid var(--ins-hl);
  border-radius: 999px;
  padding: 4px 10px;
  white-space: nowrap;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--muted);
  cursor: pointer;
}
.icon-btn:hover { color: var(--text); border-color: var(--border-strong); }
html[data-theme="light"] .icon-sun { display: none; }
html[data-theme="dark"] .icon-moon { display: none; }

/* ---------------- toolbar ---------------- */

.toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  padding: 8px 18px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 20;
}

.tool-group { display: flex; align-items: center; gap: 0; }
.tool-group.toggles, .tool-group.actions { gap: 6px; flex-wrap: wrap; }
.tool-group.actions { margin-left: auto; }

.seg {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel-2);
}

.seg-btn {
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 12.5px;
  padding: 5px 11px;
  cursor: pointer;
}
.seg-btn + .seg-btn { border-left: 1px solid var(--border); }
.seg-btn:hover { color: var(--text); }
.seg-btn[aria-pressed="true"] {
  background: var(--panel);
  color: var(--text);
  font-weight: 600;
  box-shadow: inset 0 0 0 1px var(--border-strong);
}

.toggle-btn {
  font: inherit;
  font-size: 12.5px;
  padding: 5px 10px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--muted);
  cursor: pointer;
  position: relative;
}
.toggle-btn:hover { color: var(--text); border-color: var(--border-strong); }
.toggle-btn[aria-pressed="true"] {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

.action-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font: inherit;
  font-size: 12.5px;
  font-weight: 550;
  padding: 5px 12px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
}
.action-btn:hover:not(:disabled) { border-color: var(--border-strong); background: var(--panel-2); }
.action-btn:disabled { opacity: 0.45; cursor: default; }
.action-btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.action-btn.primary:hover:not(:disabled) { filter: brightness(1.08); background: var(--accent); }

.mini-btn {
  font: inherit;
  font-size: 12px;
  padding: 3px 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--muted);
  cursor: pointer;
}
.mini-btn:hover { color: var(--text); border-color: var(--border-strong); }

/* ---------------- inputs ---------------- */

.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 14px 18px 8px;
  gap: 10px;
  min-height: 0;
}

.inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.pane {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.pane-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 10px;
  border-bottom: 1px solid var(--border);
}

.pane-label {
  font-size: 12.5px;
  font-weight: 650;
  display: inline-flex;
  align-items: center;
  gap: 7px;
}
.pane-label::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
}
.pane-label.del-dot::before { background: var(--del-bar); }
.pane-label.ins-dot::before { background: var(--ins-bar); }

.pane-stats { font-size: 11.5px; color: var(--muted); font-variant-numeric: tabular-nums; }
.pane-tools { margin-left: auto; display: flex; gap: 6px; }

.pane-body { position: relative; }

.pane textarea {
  display: block;
  width: 100%;
  height: 132px;
  resize: vertical;
  border: 0;
  outline: none;
  background: transparent;
  color: var(--text);
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.55;
  padding: 9px 11px;
  border-radius: 0 0 var(--radius) var(--radius);
  tab-size: 4;
}
.pane textarea::placeholder { color: var(--muted); opacity: 0.75; }
.pane textarea:focus { box-shadow: inset 0 0 0 2px var(--accent-soft); }

.drop-hint {
  position: absolute;
  inset: 4px;
  border: 2px dashed var(--accent);
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 650;
  font-size: 13px;
  display: none;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}
.pane.dragover .drop-hint { display: flex; }

/* ---------------- status bar ---------------- */

.statusbar {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 12.5px;
  padding: 2px 2px;
}

.status-left { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 9px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  border: 1px solid transparent;
}
.chip-ins { color: var(--ins-text); background: var(--ins-bg); border-color: var(--ins-hl); }
.chip-del { color: var(--del-text); background: var(--del-bg); border-color: var(--del-hl); }
.chip-chg { color: var(--accent); background: var(--accent-soft); border-color: var(--accent); }
.chip-eq  { color: var(--muted); background: var(--panel-2); border-color: var(--border); }

.status-mid { color: var(--muted); font-size: 12px; display: flex; gap: 10px; flex-wrap: wrap; }

.status-right { margin-left: auto; display: flex; align-items: center; gap: 12px; }

.compute-state {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--muted);
  font-size: 12px;
}
.spinner {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--border-strong);
  border-top-color: var(--accent);
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.change-nav { display: inline-flex; align-items: center; gap: 7px; }
.change-label { font-variant-numeric: tabular-nums; color: var(--muted); font-size: 12px; min-width: 62px; text-align: center; }

/* ---------------- output / diff ---------------- */

.output {
  flex: 1;
  min-height: 260px;
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.empty-state {
  margin: auto;
  max-width: 520px;
  text-align: center;
  padding: 42px 24px;
  color: var(--muted);
}
.empty-state h2 { color: var(--text); font-size: 17px; margin: 14px 0 6px; }
.empty-state p { margin: 4px 0; font-size: 13px; }
.empty-actions { margin-top: 14px !important; }
.empty-tips {
  text-align: left;
  margin: 20px auto 0;
  padding-left: 18px;
  font-size: 12.5px;
  line-height: 1.8;
  max-width: 420px;
}
.empty-tips kbd {
  font-family: var(--mono);
  font-size: 11px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 1px 5px;
}

.es-pane { fill: var(--panel-2); stroke: var(--border); }
.es-line { fill: var(--muted); opacity: 0.4; }
.es-del { fill: var(--del-bar); opacity: 0.75; }
.es-ins { fill: var(--ins-bar); opacity: 0.75; }

.diff-scroll {
  flex: 1;
  overflow: auto;
  position: relative;
  min-height: 0;
  outline: none;
}
.diff-scroll:focus-visible { box-shadow: inset 0 0 0 2px var(--accent-soft); }

.identical-banner {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ins-text);
  background: var(--ins-bg);
  border-bottom: 1px solid var(--ins-hl);
}

.diff-sizer {
  min-width: max-content;
  font-family: var(--mono);
  font-size: 12.5px;
}

.diff-window { min-width: max-content; }

/* rows */

.row {
  display: grid;
  height: var(--rowh);
  line-height: var(--rowh);
  white-space: pre;
}
.row .cell {
  padding: 0 10px;
  overflow: hidden;
  min-width: 0;
}

/* split layout */
.row.split { grid-template-columns: var(--numw) 1fr var(--numw) 1fr; }
/* unified layout */
.row.uni { grid-template-columns: var(--numw) var(--numw) 1fr; }

.cell.num {
  text-align: right;
  color: var(--muted);
  font-size: 11px;
  padding: 0 8px;
  user-select: none;
  border-right: 1px solid var(--border);
  background: var(--panel);
}

.row.eq .txt { color: var(--text); }

.row.ch .cell.del { background: var(--del-bg); }
.row.ch .cell.ins { background: var(--ins-bg); }
.row.ch .cell.del .txt, .row.udel .txt { color: var(--del-text); }
.row.ch .cell.ins .txt, .row.uins .txt { color: var(--ins-text); }

.row.ch .num.del { background: var(--del-num); border-right-color: var(--del-hl); }
.row.ch .num.ins { background: var(--ins-num); border-right-color: var(--ins-hl); }

.cell.empty {
  background:
    repeating-linear-gradient(-45deg, transparent 0 6px, var(--panel-2) 6px 12px);
  border-right: 1px solid var(--border);
}
.cell.num.empty { background: var(--panel); }

/* unified rows */
.row.udel { background: var(--del-bg); }
.row.uins { background: var(--ins-bg); }
.row.udel .num { background: var(--del-num); border-right-color: var(--del-hl); }
.row.uins .num { background: var(--ins-num); border-right-color: var(--ins-hl); }
.sig {
  display: inline-block;
  width: 14px;
  user-select: none;
  font-weight: 700;
}

/* intra-line highlight */
.hl-del { background: var(--del-hl); border-radius: 3px; box-decoration-break: clone; }
.hl-ins { background: var(--ins-hl); border-radius: 3px; box-decoration-break: clone; }

/* whitespace visualization */
.ws-dot { color: var(--muted); opacity: 0.65; }

/* no-trailing-newline note */
.eol-note {
  float: right;
  font-family: var(--sans);
  font-size: 10px;
  color: var(--muted);
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0 6px;
  margin: 4px 4px 0 8px;
  line-height: 13px;
  user-select: none;
}

/* collapse gap row */
.row.gap {
  display: block;
  background: var(--gap-bg);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  text-align: center;
  cursor: pointer;
  color: var(--muted);
  font-size: 11.5px;
  font-family: var(--sans);
  user-select: none;
}
.row.gap:hover { color: var(--accent); background: var(--accent-soft); }
.row.gap .gap-arrows { letter-spacing: 2px; margin-right: 6px; }

/* change navigation flash */
.row.nav-target .cell, .row.nav-target {
  animation: navflash 1.6s ease-out;
}
@keyframes navflash {
  0% { box-shadow: inset 0 0 0 100px var(--accent-soft); }
  100% { box-shadow: inset 0 0 0 100px transparent; }
}

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

.app-footer {
  padding: 8px 18px 14px;
  color: var(--muted);
  font-size: 11.5px;
  text-align: center;
}

.toast {
  position: fixed;
  bottom: 22px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  font-size: 12.5px;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 999px;
  box-shadow: var(--shadow);
  z-index: 50;
  animation: toast-in 0.18s ease-out;
}
@keyframes toast-in {
  from { opacity: 0; transform: translateX(-50%) translateY(8px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ---------------- responsive ---------------- */

@media (max-width: 900px) {
  .inputs { grid-template-columns: 1fr; }
  .pane textarea { height: 108px; }
  .tool-group.actions { margin-left: 0; }
  .tagline { display: none; }
}

@media (max-width: 560px) {
  .privacy-badge { display: none; }
  .statusbar { gap: 8px; }
  .main { padding: 10px 10px 6px; }
  .toolbar { padding: 8px 10px; }
  .app-header { padding: 8px 10px; }
}

@media (prefers-reduced-motion: reduce) {
  .row.nav-target .cell, .row.nav-target { animation: none; }
  .spinner { animation-duration: 1.6s; }
  .toast { animation: none; }
}