/* ── BASE ─────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:         #1e1e1e;
  --bg2:        #252526;
  --bg3:        #2d2d30;
  --border:     #3e3e42;
  --border2:    #555;
  --text:       #d4d4d4;
  --text-dim:   #8a8a8a;
  --accent:     #0e78d4;
  --accent2:    #569cd6;
  --green:      #4ec9b0;
  --yellow:     #dcdcaa;
  --purple:     #c586c0;
  --red:        #f44747;
  --orange:     #ce9178;
  --r:          4px;
  --hdr:        40px;
  --stats:      26px;
}

html, body { height: 100%; overflow: hidden; background: var(--bg); color: var(--text); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; font-size: 13px; }

/* ── HEADER ──────────────────────────────────────────────────────────── */
#header {
  height: var(--hdr);
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 12px;
  gap: 12px;
  flex-shrink: 0;
  z-index: 100;
}

#logo {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent2);
  letter-spacing: -0.3px;
  white-space: nowrap;
}

#flavor-select {
  background: var(--bg3);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 3px 6px;
  font-size: 12px;
  cursor: pointer;
}

#flavor-notes {
  font-size: 11px;
  color: var(--text-dim);
  max-width: 300px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.flavor-note { display: inline; }
.fn-feat { color: var(--yellow); }

.header-right { margin-left: auto; display: flex; align-items: center; gap: 8px; }

#btn-share, #btn-save {
  background: var(--bg3);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 4px 10px;
  font-size: 12px;
  cursor: pointer;
  transition: background .15s;
}
#btn-share:hover, #btn-save:hover { background: var(--border); }

#share-toast {
  font-size: 11px;
  color: var(--green);
  padding: 0 6px;
}

/* ── STATS BAR ───────────────────────────────────────────────────────── */
#stats-bar {
  height: var(--stats);
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 12px;
  gap: 16px;
  flex-shrink: 0;
  font-size: 11px;
  color: var(--text-dim);
}

#stats-bar span { white-space: nowrap; }
#stat-matches { color: var(--green); }
#stat-time { color: var(--yellow); }

#error-bar {
  padding: 4px 12px;
  background: #3d1b1b;
  color: var(--red);
  font-size: 12px;
  font-family: monospace;
  border-bottom: 1px solid #6b2020;
}

#backtrack-warn {
  padding: 4px 12px;
  background: #3d2e1b;
  color: var(--orange);
  font-size: 12px;
  border-bottom: 1px solid #5a3b00;
}

/* ── LAYOUT ──────────────────────────────────────────────────────────── */
#layout {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

#workspace {
  display: flex;
  flex: 1;
  overflow: hidden;
  min-height: 0;
}

.pane {
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}

#pane-editor { width: 320px; flex: none; border-right: 1px solid var(--border); background: var(--bg); }
#pane-test   { flex: 1; border-right: 1px solid var(--border); background: var(--bg); min-width: 200px; }
#pane-tools  { width: 400px; flex: none; background: var(--bg); }

.splitter {
  width: 4px;
  cursor: col-resize;
  background: var(--border);
  flex-shrink: 0;
  transition: background .15s;
}
.splitter:hover { background: var(--accent2); }

/* ── EDITOR PANE ─────────────────────────────────────────────────────── */
#regex-bar {
  display: flex;
  align-items: center;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  padding: 4px 8px;
  gap: 4px;
  flex-shrink: 0;
}

.delim { color: #9cdcfe; font-size: 16px; font-family: monospace; line-height: 1; flex-shrink: 0; }

#regex-editor-cm {
  flex: 1;
  min-width: 0;
  font-family: monospace;
}

#regex-editor-cm .cm-editor { background: transparent; }

/* Flags */
#flags-container { display: flex; gap: 2px; flex-shrink: 0; }

.flag-btn {
  width: 22px;
  height: 22px;
  font-size: 11px;
  font-weight: bold;
  font-family: monospace;
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: 3px;
  cursor: pointer;
  transition: all .1s;
  display: flex; align-items: center; justify-content: center;
}
.flag-btn:hover { border-color: var(--border2); color: var(--text); }
.flag-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }

/* Replace bar */
#replace-bar {
  display: flex;
  align-items: center;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  padding: 4px 8px;
  gap: 6px;
  flex-shrink: 0;
}
#replace-bar label { font-size: 11px; color: var(--text-dim); white-space: nowrap; }
#replace-input {
  flex: 1;
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 3px 6px;
  font-family: monospace;
  font-size: 12px;
  border-radius: 3px;
  min-width: 0;
}
#replace-input:focus { outline: none; border-color: var(--accent); }

#download-result {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 3px 8px;
  font-size: 11px;
  border-radius: 3px;
  cursor: pointer;
  white-space: nowrap;
}
#download-result:hover { color: var(--text); border-color: var(--border2); }

/* Editor scroll area */
#editor-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

#saved-section { margin-top: 8px; }
#saved-section h4 { font-size: 11px; color: var(--text-dim); margin-bottom: 4px; padding: 0 2px; }
#saved-list { display: flex; flex-direction: column; gap: 3px; }

.saved-item {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 5px 8px;
  cursor: pointer;
  position: relative;
}
.saved-item:hover { border-color: var(--accent); }
.si-name { font-size: 12px; color: var(--text); margin-bottom: 2px; }
.si-pat { font-size: 10px; color: var(--text-dim); font-family: monospace; }
.si-del { position: absolute; top: 4px; right: 6px; background: none; border: none; color: var(--text-dim); cursor: pointer; font-size: 11px; }
.si-del:hover { color: var(--red); }

/* ── TEST PANE ───────────────────────────────────────────────────────── */
#test-tabs {
  display: flex;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.tab-btn {
  padding: 5px 14px;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 12px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all .15s;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active { color: var(--text); border-bottom-color: var(--accent2); }

#test-view { flex: 1; display: flex; flex-direction: column; min-height: 0; }
#replace-view { flex: 1; display: flex; flex-direction: column; min-height: 0; }

#test-editor-cm {
  flex: 1;
  min-height: 0;
  overflow: hidden;
}
#test-editor-cm .cm-editor { height: 100%; }
#test-editor-cm .cm-scroller { height: 100%; overflow: auto; }

#replace-preview {
  flex: 1;
  overflow: auto;
  padding: 10px;
  font-family: monospace;
  font-size: 13px;
  white-space: pre-wrap;
  word-break: break-all;
  color: var(--text);
  background: var(--bg);
}

/* Match colors */
.rl-g0 { background-color: rgba(246,246,58,0.25); }
.rl-g1 { background-color: rgba(246,69,58,0.3); }
.rl-g2 { background-color: rgba(58,246,112,0.25); }
.rl-g3 { background-color: rgba(58,174,246,0.3); }
.rl-g4 { background-color: rgba(246,165,58,0.3); }
.rl-g5 { background-color: rgba(192,58,246,0.25); }
.rl-g6 { background-color: rgba(58,246,246,0.25); }
.rl-g7 { background-color: rgba(246,58,170,0.25); }
.rl-cursor-pos { background-color: rgba(255,255,0,0.5) !important; outline: 2px solid yellow; }
.rl-error { text-decoration: wavy underline var(--red); }
.rl-token-highlight { background-color: rgba(86,156,214,0.35); outline: 1px solid var(--accent2); border-radius: 2px; }

/* Groups inspector */
#groups-inspector {
  max-height: 160px;
  overflow-y: auto;
  border-top: 1px solid var(--border);
  background: var(--bg2);
  flex-shrink: 0;
}

.no-matches { padding: 8px 12px; color: var(--text-dim); font-size: 12px; }

.match-item {
  border-bottom: 1px solid var(--border);
  padding: 4px 10px;
}
.match-header { display: flex; align-items: center; gap: 8px; margin-bottom: 2px; }
.mi-idx { font-size: 10px; color: var(--text-dim); font-family: monospace; }
.mi-val { font-family: monospace; font-size: 12px; color: var(--text); flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mi-pos { font-size: 10px; color: var(--text-dim); }

.group-item { display: flex; gap: 8px; margin-left: 12px; margin-bottom: 1px; align-items: center; }
.gi-idx { font-size: 10px; font-family: monospace; padding: 1px 4px; border-radius: 2px; flex-shrink: 0; }
.gi-val { font-family: monospace; font-size: 11px; color: var(--text-dim); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.match-more { padding: 4px 10px; font-size: 11px; color: var(--text-dim); font-style: italic; }

/* ── TOOLS PANE ──────────────────────────────────────────────────────── */
#tools-tabs {
  display: flex;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  overflow-x: auto;
  scrollbar-width: none;
}
#tools-tabs::-webkit-scrollbar { display: none; }

.tools-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
}

/* ── NFA PANEL ───────────────────────────────────────────────────────── */
#panel-nfa { position: relative; }

#nfa-canvas-wrap {
  flex: 1;
  position: relative;
  overflow: hidden;
  min-height: 0;
}

#nfa-canvas { display: block; width: 100%; height: 100%; }

#nfa-controls {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  background: var(--bg2);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.nfa-btn {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--r);
  width: 30px;
  height: 26px;
  font-size: 13px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: background .1s;
}
.nfa-btn:hover:not(:disabled) { background: var(--border); }
.nfa-btn:disabled { opacity: 0.4; cursor: default; }

#nfa-status { flex: 1; font-size: 11px; color: var(--text-dim); font-family: monospace; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* ── EXPLAIN PANEL ───────────────────────────────────────────────────── */
#explain-content {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.ep-empty { color: var(--text-dim); padding: 16px; font-size: 12px; }

.ei-item {
  margin-left: calc(var(--depth, 0) * 14px);
  margin-bottom: 3px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 4px 8px;
  border-left: 3px solid var(--accent);
}
.ei-item[style*="--depth:1"] { border-left-color: var(--green); }
.ei-item[style*="--depth:2"] { border-left-color: var(--purple); }
.ei-item[style*="--depth:3"] { border-left-color: var(--yellow); }
.ei-item[style*="--depth:4"] { border-left-color: var(--orange); }

.ei-label { font-size: 12px; color: var(--text); font-weight: 500; }
.ei-detail { font-size: 11px; color: var(--text-dim); margin-top: 1px; }

/* ── LIBRARY ─────────────────────────────────────────────────────────── */
#lib-search {
  width: 100%;
  background: var(--bg3);
  border: none;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  padding: 7px 12px;
  font-size: 13px;
  flex-shrink: 0;
}
#lib-search:focus { outline: none; border-bottom-color: var(--accent); }
#lib-search::placeholder { color: var(--text-dim); }

#lib-list {
  flex: 1;
  overflow-y: auto;
}

.lib-item {
  padding: 7px 12px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background .1s;
}
.lib-item:hover { background: var(--bg2); }
.li-name { font-size: 12px; font-weight: 600; color: var(--text); margin-bottom: 2px; }
.li-desc { font-size: 11px; color: var(--text-dim); margin-bottom: 3px; }
.li-tags { display: flex; flex-wrap: wrap; gap: 3px; margin-bottom: 3px; }
.tag { font-size: 10px; background: var(--bg3); border: 1px solid var(--border); border-radius: 10px; padding: 0 6px; color: var(--text-dim); }
.li-pattern { font-family: monospace; font-size: 11px; color: var(--accent2); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ── CODE GEN ────────────────────────────────────────────────────────── */
#codegen-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

#codegen-lang {
  flex: 1;
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 4px 8px;
  border-radius: var(--r);
  font-size: 12px;
  cursor: pointer;
}

#codegen-copy {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 4px 12px;
  border-radius: var(--r);
  font-size: 12px;
  cursor: pointer;
}
#codegen-copy:hover { background: var(--border); }

#codegen-output {
  flex: 1;
  overflow: auto;
  padding: 12px;
  font-family: monospace;
  font-size: 12px;
  line-height: 1.5;
  color: var(--text);
  white-space: pre;
  background: var(--bg);
  tab-size: 4;
}

/* ── PERF PANEL ──────────────────────────────────────────────────────── */
#perf-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

#perf-iter {
  flex: 1;
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 4px 8px;
  border-radius: var(--r);
  font-size: 12px;
}

#perf-run {
  background: var(--accent);
  border: none;
  color: #fff;
  padding: 5px 16px;
  border-radius: var(--r);
  font-size: 12px;
  cursor: pointer;
  font-weight: 600;
}
#perf-run:hover { background: #1a8fd4; }
#perf-run:disabled { opacity: 0.6; cursor: wait; }

#perf-results {
  flex: 1;
  overflow: auto;
  padding: 12px;
}

.perf-row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}
.perf-row:last-child { border-bottom: none; }
.perf-row span:last-child { font-family: monospace; color: var(--yellow); }
.perf-warn { margin-top: 12px; color: var(--orange); font-size: 12px; background: #3d2e1b; padding: 8px; border-radius: var(--r); }
.perf-ok { margin-top: 12px; color: var(--green); font-size: 12px; background: #1a2f1a; padding: 8px; border-radius: var(--r); }

/* ── DIFF PANEL ──────────────────────────────────────────────────────── */
#diff-toolbar {
  padding: 8px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
#diff-toolbar label { font-size: 11px; color: var(--text-dim); display: block; margin-bottom: 4px; }

#diff-pattern2 {
  width: 100%;
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 5px 8px;
  font-family: monospace;
  font-size: 12px;
  border-radius: var(--r);
}
#diff-pattern2:focus { outline: none; border-color: var(--accent); }

#diff-results { flex: 1; overflow-y: auto; padding: 4px; }

.diff-row {
  display: flex;
  gap: 8px;
  padding: 3px 6px;
  border-radius: 2px;
  margin-bottom: 1px;
  font-family: monospace;
  font-size: 12px;
}
.dr-ind { flex-shrink: 0; width: 36px; color: var(--text-dim); }
.dr-line { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.dr-p1only { background: rgba(246,69,58,0.12); }
.dr-p2only { background: rgba(58,246,112,0.1); }
.dr-both { background: rgba(58,174,246,0.1); }
.dr-neither { }
.diff-legend { display: flex; gap: 12px; padding: 8px 6px; font-size: 11px; color: var(--text-dim); }
.diff-legend span { font-size: 14px; }
.diff-legend .dr-p1only { color: var(--red); background: none; }
.diff-legend .dr-p2only { color: var(--green); background: none; }
.diff-legend .dr-both { color: var(--accent2); background: none; }

/* ── GENERATOR ───────────────────────────────────────────────────────── */
#gen-inputs {
  display: flex;
  gap: 6px;
  padding: 8px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

#gen-positives, #gen-negatives {
  flex: 1;
  height: 80px;
  resize: none;
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px;
  font-family: monospace;
  font-size: 11px;
  border-radius: var(--r);
}
#gen-positives { border-color: rgba(78,201,176,0.4); }
#gen-negatives { border-color: rgba(244,71,71,0.4); }
#gen-positives:focus, #gen-negatives:focus { outline: none; border-color: var(--accent); }
#gen-positives::placeholder { color: var(--green); opacity: 0.5; }
#gen-negatives::placeholder { color: var(--red); opacity: 0.5; }

#gen-suggest {
  background: var(--accent);
  border: none;
  color: #fff;
  padding: 6px 14px;
  border-radius: var(--r);
  font-size: 12px;
  cursor: pointer;
  font-weight: 600;
  align-self: flex-end;
}
#gen-suggest:hover { background: #1a8fd4; }

#gen-results { flex: 1; overflow-y: auto; padding: 8px; }

.gen-result {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 8px;
  margin-bottom: 6px;
}
.gen-pattern { display: block; font-size: 12px; color: var(--accent2); margin-bottom: 4px; word-break: break-all; }
.gen-note { font-size: 11px; color: var(--text-dim); margin-bottom: 6px; }
.gen-use {
  background: var(--bg3);
  border: 1px solid var(--accent);
  color: var(--accent2);
  padding: 3px 10px;
  font-size: 11px;
  border-radius: var(--r);
  cursor: pointer;
}
.gen-use:hover { background: var(--accent); color: #fff; }

/* ── COMMAND PALETTE ─────────────────────────────────────────────────── */
#palette-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 1000;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 80px;
}

#palette {
  background: var(--bg2);
  border: 1px solid var(--border2);
  border-radius: 8px;
  width: 480px;
  max-width: 90vw;
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0,0,0,0.5);
}

#palette-input {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  padding: 12px 16px;
  font-size: 14px;
}
#palette-input:focus { outline: none; }
#palette-input::placeholder { color: var(--text-dim); }

#palette-list {
  max-height: 320px;
  overflow-y: auto;
}

.pal-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 9px 16px;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  transition: background .1s;
}
.pal-item:last-child { border-bottom: none; }
.pal-item:hover, .pal-item.active { background: var(--bg3); }
.pal-label { font-size: 13px; }
.pal-keys { font-size: 11px; color: var(--text-dim); background: var(--bg3); border: 1px solid var(--border); padding: 1px 6px; border-radius: 3px; font-family: monospace; }

/* ── REGEX SYNTAX HIGHLIGHT CLASSES ─────────────────────────────────── */
.rl-rx-charset { color: #9cdcfe; }   /* \d \w \s etc. */
.rl-rx-escape  { color: #d7ba7d; }   /* \n \. \( etc. */
.rl-rx-anchor  { color: #4ec9b0; }   /* ^ $ \b etc.   */
.rl-rx-class   { color: #dcdcaa; }   /* [...] */
.rl-rx-group   { color: #ffd700; }   /* ( ) */
.rl-rx-quant   { color: #c586c0; }   /* * + ? {n,m} */
.rl-rx-dot     { color: #4ec9b0; }   /* . */
.rl-rx-alt     { color: #d4d4d4; font-weight: bold; } /* | */

/* ── SCROLLBARS ──────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #777; }

/* ── MISC ────────────────────────────────────────────────────────────── */
.err { color: var(--red); font-size: 12px; padding: 8px; }

/* ── MOBILE ──────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  #workspace {
    flex-direction: column;
    overflow-y: auto;
  }
  #pane-editor { width: 100%; flex: none; height: 200px; border-right: none; border-bottom: 1px solid var(--border); }
  #pane-test   { width: 100%; flex: none; height: 260px; border-right: none; border-bottom: 1px solid var(--border); }
  #pane-tools  { width: 100%; flex: none; height: 380px; }
  .splitter { display: none; }
  #logo { font-size: 12px; }
  #flavor-notes { display: none; }
}

@media (max-width: 480px) {
  #tools-tabs .tab-btn { padding: 5px 8px; font-size: 11px; }
  #header { gap: 6px; padding: 0 8px; }
}