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

:root {
  --bg: #0f1117;
  --bg2: #1a1d27;
  --bg3: #22263a;
  --border: #2e3250;
  --text: #d4d8f0;
  --muted: #6b7099;
  --accent: #5b7cfa;
  --accent-hover: #7b97ff;
  --font: 'Segoe UI', system-ui, sans-serif;
  --mono: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  --sidebar-w: 260px;
}

html, body { height: 100%; background: var(--bg); color: var(--text); font-family: var(--font); font-size: 14px; }

/* ── Layout ── */
body { display: flex; height: 100vh; overflow: hidden; }

#sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  background: var(--bg2);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#sidebar-header {
  padding: 16px 14px 12px;
  font-weight: 600;
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--muted);
  text-transform: uppercase;
  border-bottom: 1px solid var(--border);
}

#tree { overflow-y: auto; flex: 1; padding: 8px 0; }

#main { flex: 1; display: flex; flex-direction: column; overflow: hidden; }

#topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg2);
  min-height: 44px;
}

#content { flex: 1; overflow-y: auto; padding: 32px 40px; }

/* ── Sidebar tree ── */
.tree-item {
  cursor: pointer;
  display: block;
  padding: 5px 0;
  color: var(--text);
  user-select: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.tree-item:hover { color: var(--accent-hover); }
.tree-item .icon { display: inline-block; width: 16px; font-size: 11px; color: var(--muted); }
.tree-item .file-icon { color: var(--border); }
.tree-item .label { font-size: 13px; }
.tree-children.hidden { display: none; }

/* ── Topbar ── */
#back-btn {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 4px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  transition: background .15s;
}
#back-btn:hover:not(:disabled) { background: var(--accent); border-color: var(--accent); }
#back-btn:disabled { opacity: .35; cursor: default; }

#breadcrumb { color: var(--muted); font-size: 13px; font-family: var(--mono); }

/* ── Home / dir list ── */
#home h1 { font-size: 22px; font-weight: 600; margin-bottom: 24px; color: var(--text); }
.dir-view h2 { font-size: 18px; font-weight: 600; margin-bottom: 20px; color: var(--text); }

.entry {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 8px;
  cursor: pointer;
  margin-bottom: 4px;
  background: var(--bg2);
  border: 1px solid var(--border);
  transition: background .12s, border-color .12s;
}
.entry:hover { background: var(--bg3); border-color: var(--accent); color: var(--accent-hover); }
.entry-icon { font-size: 16px; }
.empty { color: var(--muted); font-style: italic; }

/* ── File view ── */
.file-view pre {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.7;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
}
.loading { color: var(--muted); font-style: italic; }

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