:root {
  --bg: #10140f;
  --bg-2: #171d16;
  --bg-3: #20281e;
  --line: #314033;
  --text: #e7f0e4;
  --muted: #93a394;
  --amber: #f0b429;
  --amber-dim: rgba(240, 180, 41, 0.14);
  --cyan: #5ec8d8;
  --cyan-dim: rgba(94, 200, 216, 0.12);
  --rose: #e07a68;
  --violet: #b79bff;
  --ok: #7dce7a;
  --danger: #e15b4c;
  --shadow: 0 16px 40px rgba(0, 0, 0, 0.28);
  --sans: "IBM Plex Sans", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--sans);
  background:
    radial-gradient(ellipse 70% 40% at 10% -10%, rgba(240, 180, 41, 0.16), transparent 50%),
    radial-gradient(ellipse 40% 30% at 100% 0%, rgba(94, 200, 216, 0.08), transparent 46%),
    var(--bg);
  color: var(--text);
}
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: var(--cyan); }

.landing {
  max-width: 1040px;
  margin: 0 auto;
  padding: 1.4rem 1.2rem 3rem;
}
.top {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-start;
}
.brand { display: flex; gap: 0.8rem; align-items: center; }
.mark {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--bg-3);
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
}
.brand h1, .lab-bar h1 { margin: 0; font-size: 1.25rem; letter-spacing: -0.03em; }
.tag { margin: 0.15rem 0 0; color: var(--muted); font-size: 0.86rem; }
.pill {
  border: 1px solid rgba(125, 206, 122, 0.4);
  color: var(--ok);
  background: rgba(125, 206, 122, 0.08);
  border-radius: 999px;
  padding: 0.3rem 0.7rem;
  font-size: 0.78rem;
}
.hero { margin: 1.6rem 0 1.2rem; }
.hero h2 { margin: 0 0 0.45rem; font-size: clamp(1.6rem, 3vw, 2.2rem); letter-spacing: -0.03em; }
.lead { margin: 0; max-width: 42rem; color: var(--muted); line-height: 1.55; }
.grid {
  display: grid;
  grid-template-columns: 1.1fr 1.1fr 0.9fr;
  gap: 0.9rem;
}
.card {
  background: rgba(23, 29, 22, 0.92);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem 1.05rem 1.1rem;
  box-shadow: var(--shadow);
}
.card h3 { margin: 0 0 0.55rem; font-size: 1rem; }
.card ul { margin: 0; padding-left: 1.1rem; color: var(--muted); }
.card li { margin: 0.28rem 0; }
.auth-form, .stack { display: flex; flex-direction: column; gap: 0.65rem; }
label span, .lbl { display: block; margin-bottom: 0.25rem; color: var(--muted); font-size: 0.78rem; }
input, select, textarea {
  width: 100%;
  background: #0d120c;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.55rem 0.65rem;
}
textarea { min-height: 4.5rem; resize: vertical; font-family: var(--mono); font-size: 0.82rem; }
input:focus, select:focus, textarea:focus { outline: 2px solid rgba(240, 180, 41, 0.45); border-color: var(--amber); }
.btn {
  border: 1px solid var(--line);
  background: var(--bg-3);
  border-radius: 8px;
  padding: 0.5rem 0.75rem;
}
.btn.primary { background: var(--amber); color: #1a1404; border-color: transparent; font-weight: 600; }
.btn.danger { color: #ffd0cb; border-color: rgba(225, 91, 76, 0.45); }
.btn.ghost { background: transparent; }
.btn:disabled { opacity: 0.55; cursor: default; }
.err { color: #ffb4ac; min-height: 1.1rem; margin: 0; font-size: 0.86rem; }
.notes { color: var(--muted); font-size: 0.86rem; line-height: 1.5; }
.notes code, code, .mono { font-family: var(--mono); }

.lab {
  height: 100%;
  display: grid;
  grid-template-rows: auto 1fr;
}
.lab-bar {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.7rem 0.9rem;
  border-bottom: 1px solid var(--line);
  background: rgba(16, 20, 15, 0.9);
}
.lab-bar .grow { flex: 1; }
.selectors { display: flex; gap: 0.45rem; flex-wrap: wrap; }
.selectors select { width: auto; min-width: 8rem; }
.shell {
  display: grid;
  grid-template-columns: 250px 1fr;
  min-height: 0;
}
.side {
  border-right: 1px solid var(--line);
  padding: 0.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  min-height: 0;
  background: rgba(12, 16, 11, 0.55);
}
.nav { display: flex; flex-direction: column; gap: 0.35rem; }
.nav button { text-align: left; }
.nav button.active { border-color: var(--amber); background: var(--amber-dim); }
.endpoint {
  margin-top: auto;
  font-size: 0.78rem;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.7rem;
  background: var(--bg-2);
}
.endpoint strong { color: var(--text); font-weight: 600; }
.endpoint p { margin: 0.35rem 0; }
.main { min-width: 0; min-height: 0; overflow: auto; padding: 0.9rem 1rem 1.4rem; }
.row { display: flex; gap: 0.5rem; flex-wrap: wrap; align-items: center; }
.split { display: grid; grid-template-columns: 280px 1fr; gap: 0.9rem; min-height: 100%; }
.mods { display: flex; flex-direction: column; gap: 0.35rem; }
.mod {
  text-align: left;
  border: 1px solid var(--line);
  background: var(--bg-2);
  border-radius: 10px;
  padding: 0.55rem 0.65rem;
}
.mod.active { border-color: var(--amber); }
.mod .lvl { color: var(--amber); font-size: 0.68rem; letter-spacing: 0.08em; text-transform: uppercase; }
.mod.done .lvl { color: var(--ok); }
.lesson h2 { margin: 0 0 0.4rem; }
.lesson p { color: var(--muted); line-height: 1.55; }
.lesson ol { color: var(--text); line-height: 1.45; }
.callout {
  border-left: 3px solid var(--amber);
  background: var(--amber-dim);
  padding: 0.7rem 0.8rem;
  border-radius: 0 10px 10px 0;
  margin: 0.8rem 0;
}
.callout.ok { border-color: var(--ok); background: rgba(125, 206, 122, 0.1); }
.callout.bad { border-color: var(--danger); background: rgba(225, 91, 76, 0.1); }
.forms {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.7rem;
  margin-bottom: 0.8rem;
}
.forms h3, .panel h3 { margin: 0 0 0.45rem; font-size: 0.92rem; }
.board { display: grid; grid-template-columns: 1fr 1fr; gap: 0.8rem; }
.entity {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.7rem 0.75rem;
  background: var(--bg-2);
  margin-bottom: 0.5rem;
}
.entity header { display: flex; justify-content: space-between; gap: 0.4rem; align-items: center; }
.entity h4 { margin: 0; font-family: var(--mono); font-size: 0.92rem; }
.badge {
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: 999px;
  padding: 0.12rem 0.45rem;
  border: 1px solid var(--line);
}
.badge.direct { color: var(--amber); border-color: rgba(240, 180, 41, 0.4); }
.badge.fanout { color: var(--violet); border-color: rgba(183, 155, 255, 0.45); }
.badge.topic { color: var(--cyan); border-color: rgba(94, 200, 216, 0.45); }
.badge.headers { color: var(--rose); border-color: rgba(224, 122, 104, 0.5); }
.meta { color: var(--muted); font-size: 0.78rem; margin: 0.35rem 0; }
.msg {
  font-family: var(--mono);
  font-size: 0.75rem;
  background: #0d120c;
  border-radius: 6px;
  padding: 0.3rem 0.4rem;
  margin-top: 0.25rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.trace { list-style: none; margin: 0; padding: 0; }
.trace li {
  display: grid;
  grid-template-columns: 7.2rem 5.5rem 1fr;
  gap: 0.45rem;
  padding: 0.35rem 0;
  border-bottom: 1px solid rgba(49, 64, 51, 0.7);
  font-size: 0.8rem;
}
.k { font-family: var(--mono); color: var(--cyan); }
.checkboxes { display: flex; gap: 0.8rem; flex-wrap: wrap; font-size: 0.82rem; color: var(--muted); }
.inbox-item {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.6rem;
  margin-bottom: 0.45rem;
  background: #121910;
}
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 0.8rem; }
.small { font-size: 0.78rem; color: var(--muted); }

@media (max-width: 980px) {
  .grid, .forms, .split, .board, .two, .shell { grid-template-columns: 1fr; }
  .shell { grid-template-rows: auto 1fr; }
  .side { border-right: 0; border-bottom: 1px solid var(--line); }
  .nav { flex-direction: row; }
  .endpoint { margin-top: 0; }
  .trace li { grid-template-columns: 1fr; }
}