:root {
  --bg: #0f1117;
  --panel: #171a23;
  --panel-2: #1e222d;
  --border: #2a2f3c;
  --text: #e6e9ef;
  --muted: #9aa3b2;
  --accent: #6aa6ff;
  --accent-2: #8b5cf6;
  --green: #2ea043;
  --green-bg: rgba(46,160,67,.18);
  --red: #f85149;
  --red-bg: rgba(248,81,73,.16);
  --radius: 12px;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  display: flex; flex-direction: column;
  height: 100vh; overflow: hidden;          /* inner panes scroll, not the page */
}

/* Top bar */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 18px; border-bottom: 1px solid var(--border);
  background: var(--panel); flex-shrink: 0;
}
.brand { display: flex; align-items: center; gap: 12px; }
.logo { font-size: 22px; }
.title { font-weight: 700; font-size: 16px; }
.subtitle { color: var(--muted); font-size: 12px; }
.top-actions { display: flex; align-items: center; gap: 8px; }
.badges { display: flex; gap: 6px; margin-right: 6px; }
.badge { font-size: 11px; padding: 3px 8px; border-radius: 20px; border: 1px solid var(--border); }
.badge.on { color: var(--green); border-color: var(--green); }
.badge.off { color: var(--muted); }

/* Buttons */
button { cursor: pointer; border-radius: 8px; border: 1px solid var(--border); font: inherit; }
button.primary { background: var(--accent); color: #06101f; border-color: var(--accent); font-weight: 600; padding: 8px 14px; }
button.primary:hover { filter: brightness(1.08); }
button.ghost { background: transparent; color: var(--text); padding: 7px 12px; }
button.ghost:hover { background: var(--panel-2); }
button.wide { width: 100%; margin-top: 14px; padding: 10px; }
button:disabled { opacity: .5; cursor: not-allowed; }

/* Layout */
.layout { flex: 1; display: grid; grid-template-columns: 1fr 360px; grid-template-rows: minmax(0, 1fr); gap: 16px; padding: 16px; min-height: 0; overflow: hidden; }
.optimize-pane { display: flex; flex-direction: column; min-height: 0; gap: 12px; }

.goal-row { display: flex; gap: 8px; }
.goal-row input { flex: 1; padding: 10px 12px; background: var(--panel); border: 1px solid var(--border); border-radius: 8px; color: var(--text); }

/* Progress */
.progress-wrap { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px 14px; }
.progress-meta { display: flex; justify-content: space-between; font-size: 12px; color: var(--muted); margin-bottom: 8px; }
.progress-bar { height: 8px; background: var(--panel-2); border-radius: 6px; overflow: hidden; }
#progressFill { height: 100%; width: 0; background: linear-gradient(90deg, var(--accent), var(--accent-2)); transition: width .4s ease; }

/* Timeline */
.scroll-area { flex: 1; min-height: 0; overflow-y: auto; display: flex; flex-direction: column; gap: 12px; padding-right: 4px; }
.timeline { display: flex; flex-direction: column; gap: 12px; }
.step {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden;
}
.step-head { display: flex; align-items: center; justify-content: space-between; padding: 10px 14px; cursor: pointer; background: var(--panel-2); }
.step-head .left { display: flex; align-items: center; gap: 10px; font-weight: 600; }
.step-head .right { display: flex; align-items: center; gap: 8px; }
.chip { font-size: 11px; padding: 2px 8px; border-radius: 20px; border: 1px solid var(--border); color: var(--muted); }
.chip.score { color: var(--accent); border-color: var(--accent); }
.chip.done { color: var(--green); border-color: var(--green); }
.chip.continue { color: var(--accent-2); border-color: var(--accent-2); }
.step-body { padding: 12px 14px; display: none; flex-direction: column; gap: 14px; }
.step.open .step-body { display: flex; }
.step.open .caret { transform: rotate(90deg); }
.caret { transition: transform .15s; color: var(--muted); }

.block-label { font-size: 11px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin-bottom: 6px; }
.thoughts { white-space: pre-wrap; background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; padding: 10px; font-size: 13px; max-height: 280px; overflow-y: auto; }
.thoughts.streaming::after { content: "▌"; color: var(--accent); animation: blink 1s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* Config change */
.cfg-change { display: flex; flex-direction: column; gap: 10px; }
.kv { font-size: 13px; }
.temp-pill { display: inline-flex; gap: 6px; align-items: center; }
.temp-old { color: var(--red); text-decoration: line-through; }
.temp-new { color: var(--green); font-weight: 600; }
.diff { white-space: pre-wrap; background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; padding: 10px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12.5px; line-height: 1.6; }
.diff ins { background: var(--green-bg); color: #7ee787; text-decoration: none; }
.diff del { background: var(--red-bg); color: #ff7b72; }
.fewshot-item { border: 1px solid var(--border); border-radius: 8px; padding: 8px; margin-top: 6px; font-size: 12.5px; }
.fewshot-item.added { border-color: var(--green); background: var(--green-bg); }
.fewshot-item .role { color: var(--muted); font-size: 11px; }

/* Probes */
.probe { border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.probe .q { padding: 8px 10px; background: var(--panel-2); font-weight: 600; font-size: 13px; }
.probe .a { padding: 8px 10px; white-space: pre-wrap; font-size: 13px; }
.probe .a.streaming::after { content: "▌"; color: var(--accent); animation: blink 1s steps(2) infinite; }

/* Final */
.final-card { background: var(--panel); border: 1px solid var(--green); border-radius: var(--radius); padding: 14px; }
.final-card h3 { margin: 0 0 10px; }

/* Chat */
.chat-pane { display: flex; flex-direction: column; background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); min-height: 0; }
.chat-head { display: flex; flex-direction: column; gap: 2px; padding: 12px 14px; border-bottom: 1px solid var(--border); font-weight: 600; }
.chat-cfg { font-size: 11px; color: var(--muted); font-weight: 400; }
.chat-messages { flex: 1; overflow-y: auto; padding: 12px; display: flex; flex-direction: column; gap: 10px; }
.bubble { padding: 8px 11px; border-radius: 10px; max-width: 90%; white-space: pre-wrap; font-size: 13px; }
.bubble.user { align-self: flex-end; background: var(--accent); color: #06101f; }
.bubble.assistant { align-self: flex-start; background: var(--panel-2); border: 1px solid var(--border); }
.bubble.assistant.streaming::after { content: "▌"; color: var(--accent); animation: blink 1s steps(2) infinite; }
.chat-input { display: flex; gap: 8px; padding: 10px; border-top: 1px solid var(--border); }
.chat-input textarea { flex: 1; resize: none; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; color: var(--text); padding: 8px; }

/* Overlay / drawer */
.overlay { position: fixed; inset: 0; background: rgba(0,0,0,.5); display: flex; justify-content: flex-end; z-index: 50; }
.drawer { width: 420px; max-width: 92vw; height: 100%; background: var(--panel); border-left: 1px solid var(--border); display: flex; flex-direction: column; }
.drawer-head { display: flex; justify-content: space-between; align-items: center; padding: 14px 16px; border-bottom: 1px solid var(--border); }
.drawer-head h3 { margin: 0; }
.drawer-body { padding: 16px; overflow-y: auto; }
.drawer-body h4 { margin: 18px 0 8px; color: var(--accent); }
.drawer-body label { display: block; font-size: 12px; color: var(--muted); margin-bottom: 10px; }
.drawer-body select, .drawer-body input[type=number], .drawer-body textarea {
  width: 100%; margin-top: 4px; padding: 8px; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font: inherit;
}
.drawer-body input[type=range] { width: 100%; }
.note { font-size: 12px; color: var(--muted); background: var(--panel-2); padding: 8px 10px; border-radius: 8px; }
code { background: var(--panel-2); padding: 1px 5px; border-radius: 4px; }
.usage-body { white-space: pre-wrap; font-family: ui-monospace, monospace; font-size: 12px; background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; padding: 12px; }

.hidden { display: none !important; }
.error-banner { background: var(--red-bg); border: 1px solid var(--red); color: #ffb4ad; padding: 10px 12px; border-radius: 8px; }