* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; overflow: hidden; }
body {
  font-family: var(--font);
  background: var(--paper);
  color: var(--ink);
  display: flex;
  flex-direction: column;
}
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }

/* ── Header ── */
.top {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.48rem 0.85rem;
  background: var(--head);
  color: #efe7db;
}
.top h1 {
  margin: 0;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}
.lang-badge {
  font-family: var(--mono);
  font-size: 0.7rem;
  background: rgba(180,69,26,0.35);
  color: #f5c8b0;
  padding: 0.1rem 0.42rem;
  border-radius: 3px;
  letter-spacing: 0.05em;
}
.top a {
  margin-left: auto;
  color: #e8c4b0;
  font-size: 0.82rem;
  text-decoration: none;
}
.top a:hover { text-decoration: underline; }
.top .reset-btn {
  background: transparent;
  border: 1px solid #6a6156;
  color: #efe7db;
  padding: 0.25rem 0.6rem;
  border-radius: 3px;
  font-size: 0.77rem;
}
.top .reset-btn:hover { border-color: #c8886a; color: #f5c8b0; }

/* ── Work area ── */
.work {
  flex: 1;
  min-height: 0;
  display: flex;
  overflow: hidden;
}

/* ── Left Sidebar ── */
.sidebar {
  width: 200px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
}
.sb-section {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.sb-section.grow { flex: 1; min-height: 0; }
.sb-section + .sb-section { border-top: 1px solid var(--line); }

.sb-head {
  flex-shrink: 0;
  padding: 0.3rem 0.65rem;
  font-size: 0.67rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--muted);
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.sb-body {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 0.2rem 0;
}

/* File tree items */
.ft-item {
  display: flex;
  align-items: center;
  gap: 0.32rem;
  padding: 0.28rem 0.6rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  cursor: pointer;
  user-select: none;
  border-left: 3px solid transparent;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.ft-item:hover { background: var(--sel); }
.ft-item.active {
  background: var(--sel);
  border-left-color: var(--rust);
  font-weight: 600;
}
.ft-dot {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--rust);
  flex-shrink: 0;
  opacity: 0;
  transition: opacity 0.15s;
}
.ft-dot.show { opacity: 1; }

/* Outline items */
.ol-item {
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
  padding: 0.25rem 0.6rem;
  font-family: var(--mono);
  font-size: 0.77rem;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.ol-item:hover { background: var(--sel); }
.ol-kw { color: var(--rust); font-weight: 600; font-size: 0.7rem; flex-shrink: 0; }
.ol-empty { padding: 0.4rem 0.65rem; font-size: 0.74rem; color: var(--muted); font-style: italic; }

/* ── Center ── */
.center {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Tabs */
.tabs {
  flex-shrink: 0;
  display: flex;
  align-items: stretch;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  overflow-y: hidden;
  min-height: 33px;
}
.tabs::-webkit-scrollbar { height: 3px; }
.tabs::-webkit-scrollbar-thumb { background: var(--line); }
.tab {
  display: flex;
  align-items: center;
  gap: 0.28rem;
  padding: 0 0.7rem;
  height: 33px;
  font-family: var(--mono);
  font-size: 0.77rem;
  cursor: pointer;
  border-right: 1px solid var(--line);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  flex-shrink: 0;
  user-select: none;
}
.tab:hover { background: rgba(0,0,0,0.04); }
.tab.active {
  background: var(--panel);
  border-bottom-color: var(--rust);
}
.tab-dirty { color: var(--rust); font-size: 0.88em; line-height: 1; }
.tab-close {
  opacity: 0;
  font-size: 0.78em;
  margin-left: 0.05rem;
  line-height: 1;
  padding: 0.1rem 0.15rem;
  border-radius: 2px;
}
.tab:hover .tab-close { opacity: 0.55; }
.tab-close:hover { opacity: 1 !important; background: var(--sel); color: var(--rust); }

/* Editor */
.editor-area {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: var(--panel);
}
.editor-hl,
.editor-ta {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  margin: 0;
  padding: 0.72rem 0.9rem;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.65;
  white-space: pre;
  tab-size: 2;
  overflow-wrap: normal;
  word-break: normal;
}
.editor-hl {
  overflow: scroll;       /* allows scrollTop/Left sync */
  scrollbar-width: none; /* Firefox */
  pointer-events: none;
  color: var(--ink);
  background: var(--panel);
}
.editor-hl::-webkit-scrollbar { display: none; } /* Chrome/Safari */
.editor-ta {
  overflow: auto;
  background: transparent;
  color: transparent;
  caret-color: var(--ink);
  border: none;
  outline: none;
  resize: none;
}
.editor-ta::selection { background: rgba(180,69,26,0.22); }

/* Token syntax colors */
.tk-kw  { color: #993010; font-weight: 600; }
.tk-str { color: #2a6830; }
.tk-num { color: #1a3a8a; }
.tk-cmt { color: #8a806a; font-style: italic; }

/* No file placeholder */
.no-file-msg {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-size: 0.85rem;
  background: var(--panel);
}

/* ── Right panel ── */
.rpanel {
  width: 240px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
}
.rp-section {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.rp-section.grow { flex: 1; min-height: 0; }
.rp-section + .rp-section { border-top: 1px solid var(--line); }
.rp-head {
  flex-shrink: 0;
  padding: 0.3rem 0.65rem;
  font-size: 0.67rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--muted);
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.rp-body {
  flex: 1;
  overflow-y: auto;
  padding: 0.2rem 0;
}

/* Diagnostics */
.diag-empty {
  padding: 0.45rem 0.65rem;
  font-size: 0.75rem;
  color: var(--ok);
}
.diag-item {
  display: flex;
  align-items: flex-start;
  gap: 0.32rem;
  padding: 0.26rem 0.6rem;
  font-size: 0.75rem;
  cursor: pointer;
  border-left: 3px solid var(--bad);
  border-left-width: 3px;
}
.diag-item:hover { background: rgba(138,42,26,0.07); }
.diag-icon { color: var(--bad); font-weight: 700; flex-shrink: 0; margin-top: 1px; }
.diag-body { line-height: 1.4; min-width: 0; }
.diag-msg { font-family: var(--mono); font-size: 0.73rem; word-break: break-word; }
.diag-loc { font-size: 0.68rem; color: var(--muted); }

/* Actions panel */
.actions-body {
  padding: 0.5rem 0.6rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.act-btn {
  background: var(--paper);
  border: 1px solid var(--line);
  color: var(--ink);
  padding: 0.28rem 0.55rem;
  border-radius: 3px;
  font-size: 0.77rem;
  text-align: left;
  width: 100%;
}
.act-btn:hover { border-color: var(--rust); color: var(--rust); }

.act-results {
  display: none;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 3px;
  max-height: 130px;
  overflow-y: auto;
  font-family: var(--mono);
  font-size: 0.72rem;
}
.act-results.show { display: block; }
.act-result-hdr {
  padding: 0.18rem 0.5rem;
  font-size: 0.68rem;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}
.act-result-item {
  display: block;
  padding: 0.2rem 0.5rem;
  cursor: pointer;
  border-left: 2px solid transparent;
}
.act-result-item:hover { background: var(--sel); border-left-color: var(--rust); }
.act-result-item em { font-style: normal; color: var(--muted); font-size: 0.68rem; }

.act-sep {
  font-size: 0.67rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-top: 0.15rem;
}
.rename-row {
  display: flex;
  gap: 0.28rem;
}
.rename-input {
  flex: 1;
  min-width: 0;
  padding: 0.26rem 0.42rem;
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: 3px;
  font-size: 0.76rem;
  font-family: var(--mono);
}
.rename-input:focus { outline: none; border-color: var(--rust); }
.rename-btn {
  background: var(--rust);
  color: #fff;
  border: none;
  padding: 0.26rem 0.5rem;
  border-radius: 3px;
  font-size: 0.8rem;
  flex-shrink: 0;
}
.rename-btn:hover { background: #933b15; }

/* ── Status bar ── */
.statusbar {
  flex-shrink: 0;
  height: 22px;
  background: var(--head);
  color: #7a7268;
  font-family: var(--mono);
  font-size: 0.68rem;
  display: flex;
  align-items: center;
  padding: 0 0.75rem;
  gap: 1.25rem;
}
.sb-fname { color: #bab0a0; }
.sb-ok { color: #6aaa80; }
.sb-err { color: #e07868; }