/* html-utils — shared design tokens & chrome */
:root {
  --bg: #0e1014;
  --bg-1: #14171d;
  --bg-2: #1a1e26;
  --bg-3: #232833;
  --border: #2a2f3a;
  --border-strong: #3a4150;
  --text: #d8dbe2;
  --text-dim: #8a90a0;
  --text-faint: #5a6070;
  --accent: #e0a878;        /* warm amber */
  --accent-dim: #8a6a4c;
  --add: #6fb38a;
  --add-bg: #6fb38a18;
  --del: #d97b7b;
  --del-bg: #d97b7b18;
  --focus: #e0a87844;

  --mono: ui-monospace, "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;

  --r-sm: 4px;
  --r: 6px;
  --r-lg: 10px;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--accent); color: var(--bg); }

a { color: var(--text); text-decoration: none; }
a:hover { color: var(--accent); }

button, input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* ---- App shell ---- */
.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-1);
  flex-shrink: 0;
}
.topbar .brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--text);
}
.topbar .brand .dot {
  width: 8px; height: 8px;
  background: var(--accent);
  border-radius: 2px;
}
.topbar .crumb {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-dim);
}
.topbar .crumb .sep { color: var(--text-faint); margin: 0 8px; }
.topbar .crumb .current { color: var(--text); }
.topbar .spacer { flex: 1; }
.topbar .meta {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-faint);
}

.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

/* ---- Toolbar (above panes) ---- */
.toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  flex-shrink: 0;
  min-height: 44px;
}
.toolbar .label {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.toolbar .spacer { flex: 1; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 28px;
  padding: 0 12px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--r);
  color: var(--text);
  font-family: var(--mono);
  font-size: 12px;
  cursor: pointer;
  transition: background 120ms, border-color 120ms, color 120ms;
  white-space: nowrap;
}
.btn:hover { background: var(--bg-3); border-color: var(--border-strong); }
.btn:active { background: var(--bg-1); }
.btn:focus-visible { outline: 2px solid var(--focus); outline-offset: 1px; }
.btn[disabled] { opacity: 0.4; cursor: not-allowed; }
.btn.primary {
  background: var(--accent);
  color: #1a1208;
  border-color: var(--accent);
  font-weight: 500;
}
.btn.primary:hover { background: #ecb789; border-color: #ecb789; }
.btn.ghost { background: transparent; }
.btn.ghost:hover { background: var(--bg-2); }
.btn .kbd {
  font-size: 10px;
  color: var(--text-faint);
  padding: 1px 4px;
  border: 1px solid var(--border);
  border-radius: 3px;
  margin-left: 4px;
}

/* ---- Pane (input/output box) ---- */
.panes {
  flex: 1;
  display: grid;
  gap: 1px;
  background: var(--border);
  min-height: 0;
}
.panes.two { grid-template-columns: 1fr 1fr; }
.panes.stacked { grid-template-rows: 1fr 1fr; }

.pane {
  display: flex;
  flex-direction: column;
  background: var(--bg);
  min-height: 0;
  min-width: 0;
}
.pane-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--bg-1);
  border-bottom: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  min-height: 32px;
  flex-shrink: 0;
}
.pane-head .pane-title { color: var(--text-dim); }
.pane-head .pane-stat { color: var(--text-faint); margin-left: auto; font-size: 11px; }
.pane-head .pane-actions { display: flex; gap: 4px; margin-left: 8px; }
.pane-head .icon-btn {
  height: 22px;
  width: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  color: var(--text-faint);
  cursor: pointer;
  padding: 0;
}
.pane-head .icon-btn:hover { color: var(--text); background: var(--bg-2); }
.pane-head .icon-btn svg { width: 13px; height: 13px; }

.pane-body {
  flex: 1;
  display: flex;
  min-height: 0;
}

textarea.pane-input {
  flex: 1;
  width: 100%;
  background: var(--bg);
  border: none;
  outline: none;
  resize: none;
  padding: 14px 16px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--text);
  tab-size: 2;
}
textarea.pane-input::placeholder { color: var(--text-faint); }

/* toast */
.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--bg-3);
  border: 1px solid var(--border-strong);
  color: var(--text);
  font-family: var(--mono);
  font-size: 12px;
  padding: 8px 14px;
  border-radius: var(--r);
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms, transform 200ms;
  z-index: 100;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* scrollbars */
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-track { background: var(--bg); }
*::-webkit-scrollbar-thumb { background: var(--bg-3); border-radius: 5px; border: 2px solid var(--bg); }
*::-webkit-scrollbar-thumb:hover { background: var(--border-strong); }