:root{
  --bg:#eef2f7;
  --panel:#fff;
  --ink:#172033;
  --muted:#64748b;
  --line:#dbe3ed;
  --blue:#2563eb;
  --editor:#0f172a;

  --del-bg:#fef2f2;
  --del-ink:#991b1b;
  --del-mark:#fecaca;
  --del-edge:#dc2626;
  --ins-bg:#ecfdf5;
  --ins-ink:#065f46;
  --ins-mark:#a7f3d0;
  --ins-edge:#059669;
  --mix-edge:#d97706;
}

*{box-sizing:border-box}

body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font:15px/1.55 Inter,system-ui,sans-serif;
}

.app{max-width:1600px;margin:auto;padding:20px}

.back{
  display:inline-block;
  margin-bottom:12px;
  color:var(--muted);
  font-size:13px;
  font-weight:650;
  text-decoration:none;
}
.back:hover{color:var(--blue)}

header,.panel{
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:17px;
  box-shadow:0 8px 25px #0f172a10;
}

header{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:16px;
  padding:15px 18px;
  margin-bottom:17px;
}
header h1{margin:0;font-size:21px}
header p{margin:1px 0;color:var(--muted);font-size:13px}

nav{display:flex;gap:8px;flex-wrap:wrap}

button,.button{
  border:1px solid var(--line);
  border-radius:10px;
  background:#fff;
  padding:9px 13px;
  font:inherit;
  font-weight:750;
  cursor:pointer;
  color:var(--ink);
}
button:hover{border-color:#93c5fd}
button:disabled{cursor:default;opacity:.45}
button:disabled:hover{border-color:var(--line)}
.primary{background:var(--blue);border-color:var(--blue);color:#fff}
.primary:hover{border-color:var(--blue)}

:focus-visible{outline:2px solid var(--blue);outline-offset:2px}
textarea:focus-visible{outline:2px solid #60a5fa;outline-offset:-2px}

.grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:17px;
  margin-bottom:17px;
}

.panel{overflow:hidden;display:flex;flex-direction:column}

.panel-head{
  min-height:55px;
  padding:10px 14px;
  border-bottom:1px solid var(--line);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  flex:none;
  flex-wrap:wrap;
}
.panel-head small{color:var(--muted)}
.head-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}

.tag{
  display:inline-block;
  margin-left:5px;
  padding:1px 7px;
  border-radius:999px;
  background:#eff6ff;
  color:var(--blue);
  font-size:11px;
  font-weight:800;
  vertical-align:middle;
}

.mini{
  border:1px solid var(--line);
  border-radius:8px;
  padding:5px 10px;
  font-size:12px;
  font-weight:700;
  color:var(--muted);
  cursor:pointer;
}
.mini:hover{border-color:#93c5fd;color:var(--ink)}
.mini:focus-within{outline:2px solid var(--blue);outline-offset:2px}
.mini input{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}

textarea{
  display:block;
  width:100%;
  min-height:32vh;
  resize:vertical;
  border:0;
  outline:0;
  padding:19px;
  background:var(--editor);
  color:#e2e8f0;
  font:13px/1.65 ui-monospace,SFMono-Regular,Consolas,monospace;
  flex:1;
}
textarea.drag-over{box-shadow:inset 0 0 0 2px var(--blue)}

.viewswitch{display:flex;gap:0}
.seg{
  border-radius:0;
  padding:6px 12px;
  font-size:13px;
  font-weight:700;
  color:var(--muted);
}
.seg:first-child{border-radius:9px 0 0 9px}
.seg:last-child{border-radius:0 9px 9px 0;border-left:0}
.seg.is-active{background:var(--blue);border-color:var(--blue);color:#fff}
.seg.is-active:hover{border-color:var(--blue)}

.summary{color:var(--muted);font-size:13px;font-weight:650}
.summary .plus{color:#047857;font-weight:800}
.summary .minus{color:var(--del-edge);font-weight:800}

.options{
  display:flex;
  flex-wrap:wrap;
  gap:10px 16px;
  align-items:center;
  padding:11px 14px;
  border-bottom:1px solid var(--line);
  background:#f8fafc;
  font-size:13px;
  color:var(--muted);
}
.options .checkbox{display:flex;align-items:center;gap:6px;cursor:pointer}
.options .checkbox input{width:15px;height:15px;accent-color:var(--blue)}
.options .select{display:flex;align-items:center;gap:7px}
.options select{
  font:inherit;
  font-weight:650;
  color:var(--ink);
  border:1px solid var(--line);
  border-radius:8px;
  background:#fff;
  padding:4px 8px;
  cursor:pointer;
}

/* ---------- Navigation ---------- */

.navbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:8px 16px;
  padding:8px 14px;
  border-bottom:1px solid var(--line);
  font-size:13px;
}
.nav-group{display:flex;align-items:center;gap:6px}
.nav-btn{
  width:32px;
  height:30px;
  padding:0;
  display:inline-grid;
  place-items:center;
  border-radius:8px;
}
.nav-btn svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.change-pos{margin-left:6px;font-weight:700;color:var(--ink);font-variant-numeric:tabular-nums}
.nav-hint{color:var(--muted);font-size:12px}
kbd{
  display:inline-block;
  min-width:18px;
  padding:0 5px;
  border:1px solid var(--line);
  border-bottom-width:2px;
  border-radius:5px;
  background:#f8fafc;
  font:600 11px/17px ui-monospace,SFMono-Regular,Consolas,monospace;
  text-align:center;
  color:var(--ink);
}

.notice{
  padding:11px 14px;
  border-bottom:1px solid var(--line);
  background:#fffbeb;
  color:#92400e;
  font-size:13px;
}

/* ---------- Ergebnis ---------- */

.diff-wrap{display:grid;grid-template-columns:minmax(0,1fr) 14px}

.diff-body{
  overflow:auto;
  overflow-anchor:none;   /* Scrollposition führt das Skript beim Nachladen selbst nach */
  max-height:70vh;
  font:12.5px/1.6 ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace;
  transition:opacity .15s;
}
.diff-body:focus-visible{outline:2px solid var(--blue);outline-offset:-2px}
.diff-body.is-stale{opacity:.55}

.diff-empty{padding:34px 14px;text-align:center;color:var(--muted);font:14px/1.5 Inter,system-ui,sans-serif}

table.diff{width:100%;border-collapse:collapse;table-layout:fixed}
col.c-num{width:52px}
col.c-sign{width:24px}
table.diff td{
  padding:2px 10px;
  vertical-align:top;
  white-space:pre-wrap;
  overflow-wrap:anywhere;
  border-bottom:1px solid #f1f5f9;
}
table.diff th{
  position:sticky;
  top:0;
  z-index:2;
  padding:6px 10px;
  background:#f8fafc;
  border-bottom:1px solid var(--line);
  color:var(--muted);
  font:700 12px/1.4 Inter,system-ui,sans-serif;
  text-align:left;
}
table.diff th + th{border-left:1px solid var(--line)}
td.num{
  padding-right:8px;
  text-align:right;
  color:#94a3b8;
  background:#f8fafc;
  border-right:1px solid var(--line);
  user-select:none;
}
table.split td.code.a{border-right:1px solid var(--line)}

tr.del td.code.a,tr.chg td.code.a,tr.rep td.code.a{background:var(--del-bg);color:var(--del-ink)}
tr.ins td.code.b,tr.chg td.code.b,tr.rep td.code.b{background:var(--ins-bg);color:var(--ins-ink)}
td.code.empty{background:#f8fafc}

table.unified tr.del td.code{background:var(--del-bg);color:var(--del-ink)}
table.unified tr.ins td.code{background:var(--ins-bg);color:var(--ins-ink)}

mark.w{background:var(--del-mark);color:inherit;border-radius:3px;padding:0 1px}
td.code.b mark.w,table.unified tr.ins mark.w{background:var(--ins-mark)}

td.sign{padding:2px 0 2px 8px;color:#94a3b8;user-select:none}
tr.del td.sign{color:var(--del-edge);font-weight:800}
tr.ins td.sign{color:var(--ins-edge);font-weight:800}

/* Randmarkierung an der Zeilennummer: auch ohne Farbwahrnehmung erkennbar */
table.split tr.del td.num:first-child,table.split tr.chg td.num:first-child,table.split tr.rep td.num:first-child{box-shadow:inset 3px 0 0 var(--del-edge)}
table.split tr.ins td.num:nth-child(3),table.split tr.chg td.num:nth-child(3),table.split tr.rep td.num:nth-child(3){box-shadow:inset 3px 0 0 var(--ins-edge)}
table.unified tr.del td.num:first-child{box-shadow:inset 3px 0 0 var(--del-edge)}
table.unified tr.ins td.num:first-child{box-shadow:inset 3px 0 0 var(--ins-edge)}

tbody.hunk{cursor:pointer}
tbody.hunk.is-current td.num{background:#e0ecff;color:#1e3a8a}
tbody.hunk-first.is-current tr:first-child td{border-top:2px solid var(--blue)}
tbody.hunk-last.is-current tr:last-child td{border-bottom:2px solid var(--blue)}
tr.ph td{padding:0;border:0;background:repeating-linear-gradient(#fff 0 22px,#f8fafc 22px 23px)}

tr.gap-row td{
  padding:5px 10px;
  background:#f1f5f9;
  color:var(--muted);
  font:600 12px/1.5 Inter,system-ui,sans-serif;
  text-align:center;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  white-space:normal;
}
.gap-label{letter-spacing:.02em;margin-right:10px}
.gap-actions{display:inline-flex;gap:6px;flex-wrap:wrap;justify-content:center;vertical-align:middle}
.gap-btn{
  padding:2px 9px;
  border-radius:7px;
  font-size:12px;
  font-weight:700;
  color:var(--blue);
  background:#fff;
}

/* ---------- Übersichtsleiste ---------- */

.minimap{
  position:relative;
  max-height:70vh;
  background:#f8fafc;
  border-left:1px solid var(--line);
  cursor:pointer;
}
.mm{
  position:absolute;
  left:2px;
  right:2px;
  min-height:3px;
  border-radius:2px;
  background:var(--mix-edge);
  opacity:.8;
}
.mm-del{background:var(--del-edge)}
.mm-ins{background:var(--ins-edge)}
.mm.is-current{left:1px;right:1px;opacity:1;box-shadow:0 0 0 2px #fff,0 0 0 3px var(--blue)}

@media(max-width:1050px){
  .grid{grid-template-columns:1fr}
  header{align-items:flex-start;flex-direction:column}
  col.c-num{width:40px}
}

@media(max-width:640px){
  .app{padding:14px}
  .nav-hint{display:none}
  .options .select{flex-wrap:wrap;width:100%}
  .options select{max-width:100%;min-width:0;flex:1}
  .diff-wrap{grid-template-columns:minmax(0,1fr) 10px}
  table.diff td{padding:2px 6px}
  col.c-num{width:34px}
  td.num{padding-right:5px;font-size:11px}
  .gap-label{display:block;margin:0 0 4px}
}

@media(prefers-reduced-motion:reduce){
  .diff-body{transition:none}
}