:root {
  --bg: #0c1014;
  --panel: #141a22;
  --ink: #d7e0ea;
  --muted: #7f8fa3;
  --line: #243041;
  --accent: var(--sanctum-family-accent, #e8a838);
  --ok: #6aa88a;
  --err: #c97878;
  --sys: #7aa2c8;
  --serif: "Source Serif 4", Georgia, serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: var(--mono);
  color: var(--ink);
  background:
    radial-gradient(900px 480px at 80% -20%, #1a2433 0%, transparent 55%),
    linear-gradient(165deg, #090c10, var(--bg) 45%, #0e141c);
}

.app {
  max-width: 1100px;
  margin: 0 auto;
  min-height: 100vh;
  padding: 1.25rem 1rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.mast {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 1rem;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.85rem;
}
.brand-name {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.brand-sub {
  margin: 0.2rem 0 0;
  color: var(--muted);
  font-size: 0.85rem;
}
.session-meta { font-size: 0.8rem; text-align: right; }
.muted { color: var(--muted); }

.gate {
  max-width: 26rem;
  margin: 2.5rem auto 0;
  background: rgba(20, 26, 34, 0.92);
  border: 1px solid var(--line);
  padding: 1.4rem 1.35rem 1.5rem;
}
.gate h1 {
  margin: 0 0 0.35rem;
  font-family: var(--serif);
  font-size: 1.55rem;
  font-weight: 600;
}
.lede { margin: 0 0 1rem; color: var(--muted); font-size: 0.9rem; line-height: 1.45; }
.gate label { display: block; font-size: 0.75rem; color: var(--muted); margin: 0.7rem 0 0.25rem; }
.gate input, .cmd-form input {
  width: 100%;
  background: #0a0e13;
  border: 1px solid var(--line);
  color: var(--ink);
  border-radius: 0;
  padding: 0.6rem 0.7rem;
  font: inherit;
}
.gate button, .cmd-form button {
  appearance: none;
  margin-top: 1rem;
  background: var(--accent);
  color: #1a1408;
  border: 0;
  padding: 0.65rem 1rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.gate button:hover, .cmd-form button:hover { filter: brightness(1.05); }
.hint { margin: 1rem 0 0; font-size: 0.78rem; line-height: 1.4; }
.err { color: var(--err); font-size: 0.85rem; margin-top: 0.75rem; }
code { color: var(--accent); }

.shell {
  flex: 1;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 1rem;
  min-height: 0;
}
.gate[hidden],
.shell[hidden],
.session-meta[hidden] {
  display: none !important;
}
.side {
  background: rgba(20, 26, 34, 0.85);
  border: 1px solid var(--line);
  padding: 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.side-block h2 {
  margin: 0 0 0.35rem;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-weight: 500;
}
.side-value { margin: 0; font-size: 0.92rem; line-height: 1.35; }
.plain-list {
  list-style: none;
  margin: 0.45rem 0 0;
  padding: 0;
  font-size: 0.8rem;
  color: var(--muted);
}
.plain-list li { margin: 0.2rem 0; }
.plain-list button {
  appearance: none;
  background: transparent;
  border: 0;
  color: var(--ok);
  font: inherit;
  padding: 0;
  cursor: pointer;
  text-align: left;
}
.side-help { margin: auto 0 0; font-size: 0.75rem; }

.main {
  display: flex;
  flex-direction: column;
  min-height: 60vh;
  border: 1px solid var(--line);
  background: rgba(10, 14, 19, 0.92);
}
.log {
  flex: 1;
  overflow-y: auto;
  padding: 0.9rem 1rem;
  font-size: 0.86rem;
  line-height: 1.45;
}
.line { margin: 0 0 0.45rem; white-space: pre-wrap; word-break: break-word; }
.line.sys { color: var(--sys); }
.line.err { color: var(--err); }
.line.ok { color: var(--ok); }
.line.chat .who { color: var(--accent); font-weight: 500; }
.line.meta { color: var(--muted); font-size: 0.78rem; }

.cmd-form {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.5rem;
  align-items: center;
  border-top: 1px solid var(--line);
  padding: 0.65rem 0.75rem;
}
.cmd-form .prompt { color: var(--accent); font-weight: 600; }
.cmd-form button { margin-top: 0; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

@media (max-width: 760px) {
  .shell { grid-template-columns: 1fr; }
  .side { order: 2; }
  .main { order: 1; min-height: 50vh; }
  .mast { flex-direction: column; align-items: flex-start; }
  .session-meta { text-align: left; }
}