:root {
  --bg: #0f1115;
  --panel: #181b22;
  --panel-2: #1f232c;
  --border: #2a2f3a;
  --text: #e6e8ec;
  --muted: #9aa3b2;
  --accent: #6ea8fe;
  --accent-2: #5b8def;
  --green: #4caf7d;
  --red: #e5675f;
  --amber: #d8a24a;
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 24px; background: var(--panel);
  border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 10;
}
.brand { font-weight: 700; font-size: 17px; color: var(--text); }
.brand:hover { text-decoration: none; }
.topbar nav { display: flex; gap: 18px; }
.navlink { color: var(--muted); font-weight: 500; }

.container { max-width: 1100px; margin: 0 auto; padding: 24px; }

h1 { font-size: 22px; margin: 0 0 4px; }
h2 { font-size: 16px; margin: 24px 0 10px; }
h3 { font-size: 14px; margin: 0 0 8px; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }

.muted { color: var(--muted); }
.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.spread { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

/* buttons */
button, .btn {
  background: var(--accent-2); color: #fff; border: none; border-radius: 8px;
  padding: 9px 16px; font-size: 14px; font-weight: 600; cursor: pointer;
}
button:hover, .btn:hover { background: var(--accent); text-decoration: none; }
button:disabled { opacity: .5; cursor: not-allowed; }
.btn-ghost { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-ghost:hover { background: var(--panel-2); }
.btn-sm { padding: 5px 11px; font-size: 13px; }

/* cards */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.card {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; cursor: pointer; transition: border-color .15s, transform .1s;
}
.card:hover { border-color: var(--accent-2); transform: translateY(-2px); }
.card h3 { color: var(--text); text-transform: none; letter-spacing: 0; font-size: 16px; margin-bottom: 6px; }
.card .id { font-size: 12px; color: var(--muted); word-break: break-all; }

.panel {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px; margin-bottom: 18px;
}

.review-box {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
  margin: 14px 0 0;
  background: var(--panel-2);
}

/* forms */
label { display: block; font-weight: 600; margin: 14px 0 6px; }
label .hint { font-weight: 400; color: var(--muted); font-size: 12px; }
input[type=text], input[type=number], textarea, select {
  width: 100%; background: var(--panel-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px; padding: 9px 11px;
  font-size: 14px; font-family: inherit;
}
textarea { resize: vertical; min-height: 70px; }
textarea.code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; min-height: 300px; }
select { width: auto; }

/* layout: detail page */
.detail-grid { display: grid; grid-template-columns: 240px 1fr; gap: 18px; align-items: start; }
@media (max-width: 800px) { .detail-grid { grid-template-columns: 1fr; } }

.history-item {
  padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px;
  margin-bottom: 8px; cursor: pointer; background: var(--panel-2);
}
.history-item:hover { border-color: var(--accent-2); }
.history-item.active { border-color: var(--accent); }

.badge {
  display: inline-block; padding: 2px 8px; border-radius: 999px;
  font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .03em;
}
.badge.production { background: rgba(76,175,125,.18); color: var(--green); }
.badge.candidate { background: rgba(110,168,254,.18); color: var(--accent); }
.badge.rejected { background: rgba(229,103,95,.18); color: var(--red); }
.badge.archived { background: rgba(154,163,178,.18); color: var(--muted); }
.badge.human { background: rgba(110,168,254,.18); color: var(--accent); }
.badge.optimizer { background: rgba(216,162,74,.18); color: var(--amber); }
.badge.completed { background: rgba(76,175,125,.18); color: var(--green); }
.badge.failed, .badge.abandoned { background: rgba(229,103,95,.18); color: var(--red); }
.badge.escalated { background: rgba(216,162,74,.18); color: var(--amber); }
.badge.bad { background: rgba(229,103,95,.18); color: var(--red); text-transform: none; }
.badge.good { background: rgba(76,175,125,.18); color: var(--green); text-transform: none; }
.badge.pending { background: rgba(154,163,178,.18); color: var(--muted); text-transform: none; }
.vchip {
  display: inline-block; padding: 1px 7px; margin: 1px 2px; border-radius: 6px;
  font-size: 11px; font-family: ui-monospace, monospace;
  background: rgba(110,168,254,.12); color: var(--accent);
}

pre.prompt {
  background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px;
  padding: 14px; white-space: pre-wrap; word-break: break-word; margin: 0; font-size: 13.5px;
}

/* table */
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .04em; }
tr.clickable { cursor: pointer; }
tr.clickable:hover td { background: var(--panel-2); }

/* progress */
.progress { background: var(--panel-2); border-radius: 999px; height: 10px; overflow: hidden; border: 1px solid var(--border); }
.progress > div { background: var(--accent-2); height: 100%; width: 0; transition: width .4s; }

/* chat */
.chat { display: flex; flex-direction: column; gap: 10px; }
.bubble { max-width: 75%; padding: 10px 14px; border-radius: 14px; white-space: pre-wrap; word-break: break-word; }
.bubble.user { align-self: flex-end; background: var(--accent-2); color: #fff; border-bottom-right-radius: 4px; }
.bubble.assistant { align-self: flex-start; background: var(--panel-2); border: 1px solid var(--border); border-bottom-left-radius: 4px; }
.turn-role { font-size: 11px; color: var(--muted); margin: 6px 4px 0; }

/* diff */
pre.diff { background: #0c0e12; border: 1px solid var(--border); border-radius: 8px; padding: 14px; overflow-x: auto; font-size: 13px; margin: 0; }
.diff .add { color: var(--green); }
.diff .del { color: var(--red); }
.diff .hdr { color: var(--accent); }

.metric { display: inline-flex; flex-direction: column; padding: 10px 16px; background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; }
.metric .k { font-size: 11px; color: var(--muted); text-transform: uppercase; }
.metric .v { font-size: 20px; font-weight: 700; }

.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--panel); border: 1px solid var(--border); border-radius: 8px;
  padding: 12px 20px; z-index: 100; box-shadow: 0 6px 24px rgba(0,0,0,.4); max-width: 80%;
}
.toast.err { border-color: var(--red); color: var(--red); }
.hidden { display: none; }

.empty { text-align: center; color: var(--muted); padding: 40px; }