/* Agentic AI course. Scoped under .ag; neutrals reuse the site tokens so
   light/dark mode match. Role colours are shared by every diagram:
   user = blue, model = violet, tool = teal, data/memory = amber. */

.ag {
  --user: #2563eb; --user-soft: #dbeafe;
  --model: #7c3aed; --model-soft: #ede9fe;
  --tool: #0d9488; --tool-soft: #ccfbf1;
  --data: #d97706; --data-soft: #fef3c7;
  --bad: #dc2626; --bad-soft: #fee2e2;
  --good: #16a34a; --good-soft: #dcfce7;
  --mono: "JetBrains Mono", ui-monospace, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  .ag {
    --user: #60a5fa; --user-soft: #172554;
    --model: #a78bfa; --model-soft: #2e1065;
    --tool: #2dd4bf; --tool-soft: #042f2e;
    --data: #fbbf24; --data-soft: #3a2a0c;
    --bad: #f87171; --bad-soft: #450a0a;
    --good: #4ade80; --good-soft: #052e16;
  }
}
.ag [hidden] { display: none !important; }

.ag-wrap { max-width: 1180px; margin: 0 auto; padding: 0 1.25rem; }
.ag .back { margin: 1.75rem 0 0.75rem; font-size: 0.95rem; }
.ag-head h1 { margin: 0 0 0.25rem; }
.ag-head .lede { margin: 0 0 1.5rem; max-width: 72ch; }

.ag-layout { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 32px; align-items: start; }
@media (max-width: 860px) { .ag-layout { grid-template-columns: minmax(0, 1fr); gap: 16px; } }

/* ---- Lesson nav */
.ag-nav { position: sticky; top: 88px; display: grid; gap: 12px; }
@media (max-width: 860px) { .ag-nav { position: static; } }
.progress { font-size: 0.82rem; color: var(--muted); display: grid; gap: 6px; }
.progress .bar { height: 6px; background: var(--border); border-radius: 3px; overflow: hidden; }
.progress .bar b { display: block; height: 100%; width: 0; background: var(--model); transition: width 0.3s; }
.ag-nav ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; counter-reset: lesson; }
@media (max-width: 860px) {
  .ag-nav ol { display: flex; overflow-x: auto; gap: 6px; padding-bottom: 6px; scrollbar-width: thin; }
  .ag-nav ol li { flex: none; }
}
.ag-nav a {
  display: flex; align-items: center; gap: 10px; padding: 7px 10px; border-radius: 8px; text-decoration: none;
  color: var(--text); font-size: 0.92rem; line-height: 1.3;
}
.ag-nav a::before {
  counter-increment: lesson; content: counter(lesson); flex: none; width: 22px; height: 22px; border-radius: 50%;
  display: grid; place-items: center; font-size: 0.72rem; font-weight: 700; background: var(--bg-soft); color: var(--muted); border: 1px solid var(--border);
}
.ag-nav a.done::before { content: "✓"; background: var(--good-soft); color: var(--good); border-color: transparent; }
.ag-nav a:hover { background: var(--bg-soft); }
.ag-nav a[aria-current="page"] { background: var(--model-soft); font-weight: 600; }
@media (max-width: 860px) { .ag-nav a { border: 1px solid var(--border); white-space: nowrap; } }

/* ---- Lesson body */
.ag-lesson { min-width: 0; display: grid; gap: 20px; outline: none; }
.ag-lesson .kicker { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--model); }
.ag-lesson h2 { font-size: 1.7rem; margin: 2px 0 0; letter-spacing: -0.01em; }
.ag-lesson h3 { font-size: 1.1rem; margin: 6px 0 0; }
.ag-lesson p { margin: 0; line-height: 1.65; max-width: 75ch; }
.ag-lesson ul.points { margin: 0; padding-left: 20px; display: grid; gap: 6px; line-height: 1.6; max-width: 75ch; }
.ag-lesson code { font-family: var(--mono); font-size: 0.86em; background: var(--bg-soft); border: 1px solid var(--border); border-radius: 4px; padding: 0 4px; }
.ag-lesson .intro { font-size: 1.05rem; color: var(--text); }

.panel { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; display: grid; gap: 14px; min-width: 0; }
.panel-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.panel-head .title { font-weight: 600; font-size: 0.95rem; }
.panel .hint { font-size: 0.85rem; color: var(--muted); }

.takeaways { background: var(--model-soft); border-radius: 12px; padding: 14px 18px; }
.takeaways > b { display: block; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 6px; color: var(--model); }
.takeaways ul { margin: 0; padding-left: 18px; display: grid; gap: 4px; line-height: 1.55; }

.lesson-nav { display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; border-top: 1px solid var(--border); padding-top: 16px; }

/* ---- Controls */
.ag .btn, .ag .chip {
  font: inherit; font-size: 0.88rem; font-weight: 500; padding: 6px 14px; border-radius: 8px; cursor: pointer;
  background: var(--bg); color: var(--text); border: 1px solid var(--border); align-self: auto; display: inline-flex; align-items: center; gap: 6px;
}
.ag .btn:hover:not(:disabled), .ag .chip:hover { border-color: var(--model); opacity: 1; }
.ag .btn:disabled { opacity: 0.45; cursor: not-allowed; }
.ag .btn.primary { background: var(--model); color: #fff; border-color: transparent; }
.ag .btn.primary:hover:not(:disabled) { filter: brightness(1.08); }
.ag .chip[aria-pressed="true"] { background: var(--model-soft); border-color: var(--model); font-weight: 600; }
.ag .row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.ag .row.spread { justify-content: space-between; }
.ag input[type="range"] { accent-color: var(--model); width: 100%; max-width: 360px; }
.ag label.slider { display: grid; gap: 4px; font-size: 0.88rem; }
.ag label.slider span { color: var(--muted); }
.ag label.toggle { display: flex; align-items: flex-start; gap: 8px; font-size: 0.9rem; cursor: pointer; line-height: 1.4; }
.ag label.toggle input { width: 16px; height: 16px; margin-top: 2px; accent-color: var(--model); flex: none; }

/* ---- Diagrams */
.diagram { width: 100%; height: auto; display: block; overflow: visible; }
.diagram text { font-family: Inter, system-ui, sans-serif; fill: var(--text); }
.diagram .small { font-size: 11px; fill: var(--muted); }
.diagram .box { fill: var(--card-bg); stroke: var(--border); stroke-width: 1.5; }
.diagram .edge { fill: none; stroke: var(--muted); stroke-width: 1.6; opacity: 0.55; }
.diagram .edge.on { stroke: var(--model); opacity: 1; stroke-width: 2.4; }
.diagram .node-user { fill: var(--user-soft); stroke: var(--user); }
.diagram .node-model { fill: var(--model-soft); stroke: var(--model); }
.diagram .node-tool { fill: var(--tool-soft); stroke: var(--tool); }
.diagram .node-data { fill: var(--data-soft); stroke: var(--data); }
.diagram .node-bad { fill: var(--bad-soft); stroke: var(--bad); }
.diagram .node-good { fill: var(--good-soft); stroke: var(--good); }
.diagram [class^="node-"], .diagram [class*=" node-"] { stroke-width: 1.8; transition: opacity 0.25s, filter 0.25s; }
.diagram .dim { opacity: 0.28; }
.diagram .lit { filter: drop-shadow(0 0 6px color-mix(in srgb, var(--model) 60%, transparent)); }
.diagram .pulse { fill: var(--model); }
.diagram .label { font-size: 13px; font-weight: 600; }

/* Transcript / messages */
.transcript { display: grid; gap: 8px; max-height: 340px; overflow-y: auto; padding-right: 4px; }
.msg { border-radius: 10px; padding: 9px 12px; font-size: 0.9rem; line-height: 1.5; border-left: 4px solid; background: var(--bg-soft); animation: ag-in 0.3s ease both; }
.msg .who { display: block; font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.07em; margin-bottom: 2px; }
.msg.user { border-color: var(--user); } .msg.user .who { color: var(--user); }
.msg.model { border-color: var(--model); } .msg.model .who { color: var(--model); }
.msg.tool { border-color: var(--tool); } .msg.tool .who { color: var(--tool); }
.msg.data { border-color: var(--data); } .msg.data .who { color: var(--data); }
.msg.bad { border-color: var(--bad); background: var(--bad-soft); } .msg.bad .who { color: var(--bad); }
.msg.good { border-color: var(--good); background: var(--good-soft); } .msg.good .who { color: var(--good); }
.msg pre, pre.code { margin: 6px 0 0; font-family: var(--mono); font-size: 0.78rem; white-space: pre-wrap; word-break: break-word; background: var(--card-bg); border: 1px solid var(--border); border-radius: 6px; padding: 8px 10px; }
@keyframes ag-in { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .msg { animation: none; } }

.two-col { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; }
@media (max-width: 760px) { .two-col { grid-template-columns: minmax(0, 1fr); } }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; }
.card { border: 1px solid var(--border); border-radius: 12px; padding: 12px 14px; background: var(--bg); display: grid; gap: 4px; align-content: start; }
.card b { font-size: 0.95rem; }
.card span { font-size: 0.86rem; color: var(--muted); line-height: 1.5; }
.card.user { border-top: 3px solid var(--user); } .card.model { border-top: 3px solid var(--model); }
.card.tool { border-top: 3px solid var(--tool); } .card.data { border-top: 3px solid var(--data); }

/* Context bar */
.ctx { display: flex; height: 38px; border-radius: 8px; overflow: hidden; border: 1px solid var(--border); background: var(--bg); position: relative; }
.ctx > div { height: 100%; display: grid; place-items: center; font-size: 0.72rem; font-weight: 600; color: #fff; overflow: hidden; white-space: nowrap; transition: width 0.35s; }
.ctx .limit { position: absolute; right: 0; top: -4px; bottom: -4px; border-right: 2px dashed var(--bad); }
.legend-row { display: flex; flex-wrap: wrap; gap: 6px 14px; font-size: 0.8rem; color: var(--muted); }
.legend-row i { width: 10px; height: 10px; border-radius: 2px; display: inline-block; margin-right: 5px; vertical-align: -1px; }
.stat { font-family: var(--mono); font-size: 0.85rem; }
.stat.bad { color: var(--bad); font-weight: 600; }

/* Outcome badge */
.outcome { border-radius: 10px; padding: 10px 14px; font-weight: 500; line-height: 1.5; }
.outcome.good { background: var(--good-soft); color: var(--text); border-left: 4px solid var(--good); }
.outcome.bad { background: var(--bad-soft); color: var(--text); border-left: 4px solid var(--bad); }

/* Quiz */
.quiz { display: grid; gap: 14px; }
.q { border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; display: grid; gap: 10px; }
.q p.qtext { font-weight: 600; }
.q .opts { display: grid; gap: 6px; }
.q .opts button {
  text-align: left; font: inherit; font-size: 0.92rem; padding: 8px 12px; border-radius: 8px; cursor: pointer;
  background: var(--bg); color: var(--text); border: 1px solid var(--border); align-self: auto;
}
.q .opts button:hover:not(:disabled) { border-color: var(--model); opacity: 1; }
.q .opts button:disabled { cursor: default; opacity: 1; }
.q .opts button.right { background: var(--good-soft); border-color: var(--good); }
.q .opts button.wrong { background: var(--bad-soft); border-color: var(--bad); }
.q .why { font-size: 0.88rem; color: var(--muted); line-height: 1.5; }
.score { font-size: 1.1rem; font-weight: 600; }

.ag .credit { font-size: 0.82rem; color: var(--muted); margin: 28px 0 0; max-width: 95ch; line-height: 1.5; }

/* Account sync note under the progress bar */
.progress .sync { font-size: 0.8rem; line-height: 1.45; color: var(--muted); }
.progress .sync:empty { display: none; }
.ag .link-btn { font: inherit; font-weight: 600; color: var(--model); background: none; border: 0; padding: 0; cursor: pointer; text-decoration: underline; align-self: auto; }
.ag .link-btn:hover { opacity: 0.85; }