:root {
  --bg: #0e1116;
  --bg-elev: #161b22;
  --bg-elev2: #1f2630;
  --fg: #e6edf3;
  --muted: #8b949e;
  --accent: #58a6ff;
  --green: #3fb950;
  --purple: #a371f7;
  --orange: #f0883e;
  --red: #f85149;
  --border: #30363d;
  --mono: ui-monospace, "JetBrains Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, sans-serif;
  background: var(--bg);
  color: var(--fg);
  font-size: 14px;
}

header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elev);
}
header h1 { font-size: 16px; margin: 0; font-weight: 600; }
.muted { color: var(--muted); font-weight: 400; }
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 11px;
  font-family: var(--mono);
}
.badge.online { background: rgba(63, 185, 80, 0.15); color: var(--green); }
.badge.offline { background: rgba(248, 81, 73, 0.15); color: var(--red); }
.badge.replay { background: rgba(163, 113, 247, 0.15); color: var(--purple); }

.banner {
  padding: 8px 20px;
  font-size: 12px;
  background: rgba(163, 113, 247, 0.12);
  color: var(--purple);
  border-bottom: 1px solid rgba(163, 113, 247, 0.3);
}
.banner.error { background: rgba(248, 81, 73, 0.12); color: var(--red); border-bottom-color: rgba(248, 81, 73, 0.3); }
.banner.replay-banner.error { background: rgba(248, 81, 73, 0.12); color: var(--red); }

.prompt-box {
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elev);
  display: flex; flex-direction: column; gap: 10px;
}
.prompt-box textarea {
  width: 100%;
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px;
  font-family: var(--mono);
  resize: vertical;
}
.controls { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.controls label { display: flex; gap: 6px; align-items: center; font-size: 12px; color: var(--muted); }
.controls input {
  width: 70px; background: var(--bg); color: var(--fg);
  border: 1px solid var(--border); border-radius: 4px; padding: 3px 6px;
  font-family: var(--mono);
}
button {
  background: var(--accent); color: white;
  border: none; border-radius: 4px;
  padding: 6px 14px; font-weight: 500; cursor: pointer;
}
button:hover { filter: brightness(1.1); }
button:disabled { opacity: 0.4; cursor: not-allowed; }
button.ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--fg);
}
#send-twice { background: var(--purple); }

textarea:disabled { opacity: 0.5; }

.replay-controls { margin-left: auto; display: flex; gap: 6px; align-items: center; }
.replay-controls select {
  background: var(--bg); color: var(--fg); border: 1px solid var(--border);
  border-radius: 4px; padding: 4px 6px; font-family: var(--mono);
}

main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-areas: "pool sched" "seqs seqs";
  gap: 16px;
  padding: 16px 20px;
}
.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
}
.card h2 { font-size: 14px; margin: 0 0 10px; font-weight: 600; }
.card h3 { font-size: 12px; margin: 14px 0 6px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; }
.card.grow { grid-area: seqs; }
.card:nth-child(1) { grid-area: pool; }
.card:nth-child(2) { grid-area: sched; }

/* ---- block pool ---- */
.block-pool {
  display: grid;
  grid-template-columns: repeat(auto-fill, 16px);
  gap: 3px;
  padding: 8px;
  background: var(--bg);
  border-radius: 6px;
  max-height: 280px; overflow-y: auto;
}
.block {
  width: 16px; height: 16px; border-radius: 3px;
  background: var(--bg-elev2);
  position: relative;
  cursor: help;
  border: 1px solid transparent;
}
.block.free { background: #2a3140; }
.block.cached { background: #1f3b5c; }   /* free but in prefix cache */
.block.used { background: var(--green); }
.block.shared { background: var(--purple); }
.block.hashed { border-color: var(--orange); }

.legend { display: flex; gap: 14px; margin-top: 10px; font-size: 11px; color: var(--muted); flex-wrap: wrap; }
.legend-item { display: flex; align-items: center; gap: 5px; }
.swatch { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }
.swatch-free { background: #2a3140; }
.swatch-cached { background: #1f3b5c; }
.swatch-used { background: var(--green); }
.swatch-shared { background: var(--purple); }
.swatch-hashed-edge { background: var(--bg-elev2); border: 1px solid var(--orange); }

/* ---- stats ---- */
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.stat {
  background: var(--bg);
  border-radius: 6px;
  padding: 8px;
}
.stat-label { font-size: 10px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; }
.stat-value { font-family: var(--mono); font-size: 18px; margin-top: 3px; }

/* ---- log ---- */
.log {
  background: var(--bg);
  border-radius: 6px;
  padding: 8px;
  height: 140px; overflow-y: auto;
  font-family: var(--mono); font-size: 11px;
  margin: 0;
  white-space: pre-wrap; word-break: break-word;
}
.log .ev-step { color: var(--muted); }
.log .ev-admit { color: var(--accent); }
.log .ev-finish { color: var(--green); }
.log .ev-preempt { color: var(--red); }

/* ---- sequences ---- */
#seqs { display: flex; flex-direction: column; gap: 10px; }
.seq {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px;
}
.seq-header { display: flex; gap: 10px; align-items: center; }
.seq-id { font-family: var(--mono); color: var(--muted); font-size: 12px; }
.seq-status {
  font-size: 10px; text-transform: uppercase; padding: 2px 6px; border-radius: 3px;
  font-family: var(--mono); letter-spacing: 0.05em;
}
.seq-status.waiting { background: rgba(139, 148, 158, 0.2); color: var(--muted); }
.seq-status.prefilling { background: rgba(88, 166, 255, 0.15); color: var(--accent); }
.seq-status.running { background: rgba(63, 185, 80, 0.15); color: var(--green); }
.seq-status.finished { background: rgba(163, 113, 247, 0.15); color: var(--purple); }
.seq-status.preempted { background: rgba(240, 136, 62, 0.2); color: var(--orange); }
.seq-meta { color: var(--muted); font-size: 11px; font-family: var(--mono); margin-left: auto; }
.seq-blocks {
  margin-top: 8px;
  display: flex; gap: 2px; flex-wrap: wrap;
}
.seq-block {
  width: 22px; height: 14px;
  background: var(--bg-elev2);
  font-size: 9px; line-height: 14px; text-align: center;
  font-family: var(--mono);
  border-radius: 2px;
  color: var(--muted);
}
.seq-block.cached-hit { background: #1f3b5c; color: var(--accent); }
.seq-block.shared { background: var(--purple); color: white; }
.seq-text {
  margin-top: 8px;
  font-family: var(--mono); font-size: 12px;
  background: var(--bg-elev2);
  border-radius: 4px; padding: 6px;
  min-height: 24px;
  max-height: 180px;
  overflow-y: auto;
  white-space: pre-wrap; word-break: break-word;
}
.seq-text .prompt { color: var(--muted); }
.seq-text .gen { color: var(--fg); }
.seq-text .cursor {
  display: inline-block; width: 6px; background: var(--accent);
  animation: blink 1s steps(2, start) infinite;
}
@keyframes blink { to { visibility: hidden; } }

footer {
  padding: 10px 20px;
  border-top: 1px solid var(--border);
  color: var(--muted); font-size: 11px;
}
footer a { color: var(--accent); text-decoration: none; }

@media (max-width: 900px) {
  main { grid-template-columns: 1fr; grid-template-areas: "pool" "sched" "seqs"; }
  .stats { grid-template-columns: repeat(2, 1fr); }
}