:root {
  --bg: #0f1115;
  --bg-soft: #161a21;
  --bg-elev: #1c212b;
  --border: #2a313d;
  --border-soft: #232a35;
  --text: #e6e9ef;
  --text-dim: #9aa3b2;
  --text-mute: #6b7484;
  --accent: #6ee7b7;
  --accent-2: #60a5fa;
  --warn: #fbbf24;
  --err: #f87171;
  --gap: #c084fc;
  --mono: 'SF Mono', 'JetBrains Mono', 'Fira Code', Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0; height: 100%;
  background: var(--bg); color: var(--text);
  font-family: var(--sans); font-size: 14px; line-height: 1.5;
}

/* ---- top bar ---- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 22px; border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, #14181f, #101319);
}
.brand { display: flex; align-items: center; gap: 14px; }
.logo {
  font-size: 26px; font-weight: 700; color: var(--bg);
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  width: 44px; height: 44px; border-radius: 12px;
  display: grid; place-items: center;
}
.topbar h1 { margin: 0; font-size: 17px; letter-spacing: .3px; }
.tagline { margin: 2px 0 0; font-size: 12px; color: var(--text-dim); }
.engine-badge {
  font-family: var(--mono); font-size: 12px; color: var(--accent);
  border: 1px solid var(--border); background: var(--bg-soft);
  padding: 6px 12px; border-radius: 8px;
}

/* ---- layout ---- */
.layout { display: grid; grid-template-columns: 300px 1fr; height: calc(100vh - 116px); }
.sidebar {
  border-right: 1px solid var(--border); background: var(--bg-soft);
  overflow-y: auto; padding: 12px 0 40px;
}
.search { padding: 0 12px 10px; }
.search input {
  width: 100%; padding: 9px 12px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--bg);
  color: var(--text); font-size: 13px; outline: none;
}
.search input:focus { border-color: var(--accent-2); }

.cat { margin-top: 6px; }
.cat-title {
  padding: 10px 16px 6px; font-size: 11px; font-weight: 600;
  letter-spacing: .8px; text-transform: uppercase; color: var(--text-mute);
}
.tpl-item {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 16px; cursor: pointer; color: var(--text-dim);
  border-left: 2px solid transparent; transition: background .12s;
}
.tpl-item:hover { background: var(--bg-elev); color: var(--text); }
.tpl-item.active { background: var(--bg-elev); color: var(--text); border-left-color: var(--accent); }
.tpl-item .name { flex: 1; font-size: 13px; }
.tpl-item .tag {
  font-size: 10px; font-family: var(--mono); padding: 2px 6px; border-radius: 4px;
}
.tag-gap { color: var(--gap); border: 1px solid #3a2f4d; background: #1e1729; }

/* ---- workspace ---- */
.workspace { overflow-y: auto; padding: 28px 36px 60px; }
.workspace-inner { max-width: 980px; margin: 0 auto; }
.empty-state {
  height: 60vh; display: grid; place-content: center; text-align: center; gap: 8px;
  color: var(--text-mute);
}
.empty-glyph { font-size: 40px; color: var(--border); }

.tpl-header { margin-bottom: 18px; }
.tpl-header .cat-pill {
  font-size: 11px; font-family: var(--mono); color: var(--accent-2);
  letter-spacing: .5px;
}
.tpl-header h2 { margin: 4px 0 6px; font-size: 22px; }
.tpl-header p { margin: 0; color: var(--text-dim); max-width: 70ch; }
.tpl-note {
  margin-top: 10px; font-size: 12px; color: var(--gap);
  border: 1px solid #3a2f4d; background: #1a1525;
  padding: 8px 12px; border-radius: 8px;
}

/* ---- form ---- */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 22px 0; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field.full { grid-column: 1 / -1; }
.field label { font-size: 12px; color: var(--text-dim); font-weight: 500; }
.field input, .field select, .field textarea {
  background: var(--bg-soft); border: 1px solid var(--border); color: var(--text);
  border-radius: 8px; padding: 9px 11px; font-size: 13px; font-family: var(--mono);
  outline: none; transition: border-color .12s;
}
.field textarea { resize: vertical; min-height: 64px; }
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--accent-2); }
.field .hint { font-size: 11px; color: var(--text-mute); }

.actions { display: flex; align-items: center; gap: 12px; margin: 18px 0 24px; }
.btn-run {
  background: linear-gradient(135deg, var(--accent), #34d399);
  color: #06281f; border: none; font-weight: 700; font-size: 14px;
  padding: 11px 26px; border-radius: 9px; cursor: pointer;
  box-shadow: 0 2px 0 rgba(0,0,0,.2);
}
.btn-run:hover { filter: brightness(1.05); }
.btn-run:disabled { opacity: .55; cursor: wait; }
.run-status { font-size: 12px; color: var(--text-dim); font-family: var(--mono); }

/* ---- result panes ---- */
.panes { display: grid; grid-template-columns: 1fr 1.3fr; gap: 18px; }
.pane { background: var(--bg-soft); border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
.pane-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 9px 14px; border-bottom: 1px solid var(--border-soft);
  font-size: 12px; color: var(--text-dim); font-family: var(--mono);
}
.pane-body { padding: 14px; }
.pane-body pre {
  margin: 0; white-space: pre; overflow-x: auto;
  font-family: var(--mono); font-size: 12.5px; line-height: 1.55; color: var(--text);
}
.code-mirror { color: #d6deeb; }

.result-err { color: var(--err); }
.result-ok-banner { color: var(--accent); font-size: 12px; margin-bottom: 8px; font-family: var(--mono); }
.result-unsupported { color: var(--gap); }

.footer {
  height: 40px; display: flex; align-items: center; gap: 10px;
  padding: 0 24px; border-top: 1px solid var(--border);
  font-size: 11.5px; color: var(--text-mute); font-family: var(--mono);
  background: var(--bg-soft);
}
.footer .dot { color: var(--border); }

/* ---- boot overlay ---- */
.overlay {
  position: fixed; inset: 0; background: rgba(8,10,14,.82);
  display: grid; place-content: center; gap: 16px; justify-items: center;
  z-index: 50; backdrop-filter: blur(2px);
}
.overlay-msg { color: var(--text-dim); font-family: var(--mono); font-size: 13px; max-width: 80vw; text-align: center; }
.spinner {
  width: 38px; height: 38px; border-radius: 50%;
  border: 3px solid var(--border); border-top-color: var(--accent);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }