:root {
  --bg: #0d1117;
  --panel: #161b22;
  --panel-2: #1c2330;
  --border: #2b3444;
  --text: #e6edf3;
  --muted: #8b98a9;
  --accent: #58a6ff;
  --ok: #3fb950;
  --warn: #d29922;
  --danger: #f85149;
  --offset: #8b98a9;
  --ascii: #3fb950;
  --nonascii: #6b7688;
  --sel: #f0b429;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* ---------- Header ---------- */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 22px;
  background: linear-gradient(90deg, #121a2b, #161b22);
  border-bottom: 1px solid var(--border);
  gap: 10px;
  flex-wrap: wrap;
}
.title-block { min-width: 0; }
.title-block h1 { margin: 0; font-size: 18px; letter-spacing: .3px; }
.title-link { color: var(--text); text-decoration: none; border-bottom: 1px dashed transparent; transition: .15s; }
.title-link:hover { color: var(--accent); border-bottom-color: var(--accent); }
.subtitle { margin: 2px 0 0; color: var(--muted); font-size: 11.5px; }
.byline { margin: 2px 0 0; font-size: 11px; color: var(--muted); }
.byline a { color: var(--accent); text-decoration: none; border-bottom: 1px dashed transparent; transition: border-color .15s; }
.byline a:hover { border-bottom-color: var(--accent); }

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

.btn {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 9px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: .15s;
}
.btn:hover:not(:disabled) { border-color: var(--accent); background: #222c3d; }
.btn:disabled { opacity: .4; cursor: not-allowed; }
.btn-mini { padding: 5px 10px; font-size: 12px; }
.hidden { display: none; }
.mono { font-family: "Cascadia Code", Consolas, monospace; }

.chk { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); cursor: pointer; }
.chk input { accent-color: var(--accent); }

/* ---------- Drop zone ---------- */
.dropzone {
  margin: 16px 22px;
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 40px 20px;
  text-align: center;
  color: var(--muted);
  transition: .15s;
  cursor: pointer;
}
.dropzone.drag { border-color: var(--accent); background: var(--panel-2); color: var(--text); }
.dropzone strong { color: var(--text); }

/* ---------- Content ---------- */
main { padding: 0 22px 22px; }
.toolbar {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin: 14px 0;
  font-size: 13px;
  color: var(--muted);
}
.toolbar .fname { color: var(--text); font-weight: 600; }
.toolbar .hint { margin-left: auto; }

.file-tabs { display: flex; gap: 6px; }
.file-tab {
  background: var(--panel-2);
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 8px 8px 0 0;
  padding: 6px 12px;
  cursor: pointer;
  font-size: 12.5px;
  max-width: 220px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.file-tab.active { color: var(--text); border-color: var(--accent); background: var(--panel); }
.file-tab .edt-dot { color: var(--sel); }

.badge {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 2px 10px;
  font-size: 12px;
  color: var(--text);
}
.goto input, .gap input, .gap select {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 8px;
  font-size: 12.5px;
  width: 110px;
  font-family: "Cascadia Code", Consolas, monospace;
}
.gap input { width: 64px; }
.gap select { width: auto; }
.diffnav { display: inline-flex; align-items: center; gap: 6px; }

/* ---------- Block map ---------- */
.block-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  margin-bottom: 14px;
}
.block-head { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.block-head h2 { margin: 0; font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: .5px; }
.block-head .gap { font-size: 12.5px; color: var(--muted); display: inline-flex; align-items: center; gap: 6px; }
.cmp-legend { font-size: 12px; color: var(--muted); display: inline-flex; align-items: center; gap: 6px; }
.legend-diff { display: inline-block; width: 22px; height: 10px; border-radius: 2px; background: var(--danger); opacity: .85; }

.block-map { margin-top: 12px; }
.block-map + .block-map { padding-top: 12px; border-top: 1px dashed var(--border); }
.block-map-head { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.blk-label { font-size: 12.5px; color: var(--text); font-weight: 600; }
.blk-file {
  display: inline-block;
  background: var(--accent);
  color: var(--bg);
  font-weight: 800;
  border-radius: 4px;
  padding: 0 6px;
  margin-right: 4px;
}
.verdict { font-size: 12.5px; font-weight: 600; }
.verdict.ok { color: var(--ok); }
.verdict.warn { color: var(--warn); }

.block-bar {
  position: relative;
  height: 22px;
  margin: 10px 0;
  background: repeating-linear-gradient(90deg, #10151f, #10151f 6px, #0c1017 6px, #0c1017 12px);
  border: 1px solid var(--border);
  border-radius: 5px;
  overflow: hidden;
  cursor: pointer;
  touch-action: none;
}
.blk-seg { position: absolute; top: 0; bottom: 0; background: var(--accent); opacity: .8; border-right: 1px solid var(--bg); pointer-events: none; }
.blk-diff {
  position: absolute;
  top: 0;
  bottom: 0;
  background: var(--danger);
  opacity: .9;
  box-shadow: 0 0 0 1px rgba(0,0,0,.35) inset;
  pointer-events: none;
}
.blk-marker {
  position: absolute;
  top: -1px;
  bottom: -1px;
  width: 2px;
  margin-left: -1px;
  background: var(--sel);
  box-shadow: 0 0 4px var(--sel);
  pointer-events: none;
  left: 0;
}

.block-list { display: flex; flex-wrap: wrap; gap: 6px 12px; font-size: 12.5px; }
.blk-item { display: inline-flex; align-items: center; gap: 8px; background: var(--panel-2); border: 1px solid var(--border); border-radius: 6px; padding: 4px 10px; cursor: pointer; }
.blk-item:hover { border-color: var(--accent); }
.blk-item.muted { color: var(--muted); cursor: default; }
.blk-idx { color: var(--accent); font-weight: 700; }
.blk-size { color: var(--muted); }

/* ---------- Hex panes (virtualized) ---------- */
.viewwrap { display: block; }
.viewwrap.cmp { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

.hexpane {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 12px;
  height: 60vh;
  overflow: auto;
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 13px;
}
.hexspacer { position: relative; }
.hexwin { position: absolute; top: 0; left: 0; will-change: transform; }
.hex-row { height: 20px; line-height: 20px; white-space: pre; }
.hex-offset { color: var(--offset); }
.hex-bytes { color: var(--text); }
.hex-asciis .a { color: var(--ascii); }
.hex-asciis .a.na { color: var(--nonascii); }
.hex-sep { color: var(--border); }

/* byte state highlights (hex + ascii) */
.hex-bytes span.sel, .hex-asciis .sel { background: rgba(88,166,255,.22); border-radius: 2px; }
.hex-bytes span.cur, .hex-asciis .cur { background: rgba(240,180,41,.28); color: var(--sel); font-weight: 700; border-radius: 2px; }
.hex-bytes span.edt, .hex-asciis .edt { color: var(--warn); font-weight: 700; }
.hex-bytes span.dif, .hex-asciis .dif { background: rgba(248,81,73,.22); color: var(--danger); border-radius: 2px; }
.hex-bytes span[data-off] { cursor: pointer; }

/* Inspector */
.inspector {
  margin-top: 16px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
}
.inspector h2 { margin: 0 0 10px; font-size: 14px; color: var(--muted); text-transform: uppercase; letter-spacing: .5px; }
.cur-off { color: var(--muted); font-size: 12px; text-transform: none; letter-spacing: 0; }
.kv { display: grid; grid-template-columns: 180px 1fr; gap: 6px 16px; font-size: 13px; }
.kv .k { color: var(--muted); }
.kv .v { font-family: "Cascadia Code", Consolas, monospace; }

.edit-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--border); font-size: 13px; color: var(--muted); }
.edit-row .sel-info { color: var(--text); font-weight: 600; }
.edit-row input {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 8px;
  width: 220px;
  text-align: left;
}
.edit-row input.bad { border-color: var(--danger); }
.edit-hint { color: var(--muted); font-size: 12px; }

/* Floating selection toolbar (edit / cut icons) */
.sel-toolbar {
  position: fixed;
  z-index: 60;
  gap: 2px;
  padding: 2px;
  background: var(--panel-2);
  border: 1px solid var(--accent);
  border-radius: 7px;
  box-shadow: 0 3px 10px rgba(0,0,0,.5);
}
.sel-ico {
  width: 26px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  line-height: 1;
  background: transparent;
  color: var(--text);
  border: none;
  border-radius: 5px;
  cursor: pointer;
}
.sel-ico:hover { background: var(--accent); color: var(--bg); }

/* Floating in-place hex editor for the selection */
.sel-editor {
  position: fixed;
  z-index: 60;
  width: 300px;
  max-width: 90vw;
  padding: 8px;
  background: var(--panel-2);
  border: 1px solid var(--accent);
  border-radius: 8px;
  box-shadow: 0 4px 14px rgba(0,0,0,.55);
}
.sel-hex {
  width: 100%;
  min-height: 62px;
  resize: vertical;
  box-sizing: border-box;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 8px;
  font-size: 13px;
  letter-spacing: .5px;
  outline: none;
}
.sel-hex.bad { border-color: var(--danger); }
.sel-ed-hint { display: flex; justify-content: space-between; gap: 8px; margin-top: 6px; font-size: 11.5px; color: var(--muted); }
.sel-ed-count.ok { color: var(--ok); font-weight: 600; }
.sel-ed-count.bad { color: var(--danger); font-weight: 600; }

/* ---------- Footer ---------- */
.app-footer {
  border-top: 1px solid var(--border);
  padding: 16px 22px;
  color: var(--muted);
  font-size: 12px;
}
.footer-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }
.footer-links { display: flex; gap: 14px; }
.footer-links a { color: var(--accent); text-decoration: none; }
.footer-links a:hover { text-decoration: underline; }
.footer-meta { margin-top: 8px; display: flex; gap: 8px; flex-wrap: wrap; }
.footer-dot { color: var(--border); }