/* EL TUTOR — the site's UI: hub landing (hub.html), the learner's bay
   session with Timtim (index.html), the instructor console (ops.html), and
   the live dashboard (dashboard.html). Styles this markup (t-*, ops-*, d-*)
   and the elements the shared JS generates (team-card, bay-card, demo-card,
   lang-toggle, join-status, panic banner…). The previous CONTROL UI and its
   tokens.css/app.css live in archive/control-ui/. */

:root {
  --t-bg: #faf8f4;
  --t-surface: #ffffff;
  --t-ink: #1a1f2b;
  --t-ink-2: #3d4454;
  --t-muted: #6b7280;
  --t-line: #ebe5da;
  --t-line-2: #d9d1c2;
  --t-brand: #f2a516;
  --t-brand-hover: #e09400;
  --t-brand-ink: #1a1f2b;
  --t-brand-text: #9a5b00;
  --t-brand-soft: #fff4dc;
  --t-ok: #157f3d;
  --t-ok-soft: #e6f4ea;
  --t-danger: #b42318;
  --t-danger-soft: #fdecea;
  --t-info: #1f4fd1;
  --t-info-soft: #e8eefc;
  --t-radius: 14px;
  --t-radius-sm: 8px;
  --t-shadow: 0 1px 2px rgba(26, 31, 43, 0.04), 0 8px 24px rgba(26, 31, 43, 0.06);
  --t-font: "Plus Jakarta Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --t-mono: "JetBrains Mono", "SF Mono", Menlo, monospace;

  /* Set live by hal.js / hub.js / doors.js. */
  --arousal: 0.08;
  --threat: 0;
  --pulse: 0;
  --door-open: 0;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body.t-page {
  background: var(--t-bg);
  color: var(--t-ink);
  font-family: var(--t-font);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
h1, h2, h3 { margin: 0; letter-spacing: -0.01em; }
.t-muted { color: var(--t-muted); }
.t-sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* ── Nav ──────────────────────────────────────────────────────────────── */
.t-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 0.9rem clamp(1rem, 4vw, 2.5rem);
  background: var(--t-surface);
  border-bottom: 1px solid var(--t-line);
  position: sticky;
  top: 0;
  z-index: 10;
}
.t-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-decoration: none;
  font-size: 1.05rem;
}
.t-logo-mark {
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: var(--t-brand);
  position: relative;
}
.t-logo-mark::after {
  content: "";
  position: absolute;
  inset: 9px;
  border-radius: 50%;
  background: var(--t-ink);
}
.t-nav-links { display: flex; gap: 1.25rem; margin-left: 1rem; }
.t-nav-links a { text-decoration: none; color: var(--t-ink-2); font-weight: 500; font-size: 0.92rem; }
.t-nav-links a:hover { color: var(--t-ink); }
.t-nav-tools { margin-left: auto; display: flex; align-items: center; gap: 0.75rem; flex-wrap: wrap; justify-content: flex-end; }
.t-nav-stat { color: var(--t-muted); font-size: 0.85rem; }
.t-nav-stat b { color: var(--t-ink); }
.t-link { color: var(--t-brand-text); font-weight: 600; text-decoration: none; font-size: 0.92rem; }
.t-link:hover { text-decoration: underline; }
.t-chip {
  font-family: var(--t-mono);
  font-size: 0.75rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: var(--t-brand-soft);
  color: var(--t-brand-text);
}

/* EN/ES toggle (rendered by i18n.js). */
.lang-toggle { display: inline-flex; border: 1px solid var(--t-line-2); border-radius: var(--t-radius-sm); overflow: hidden; }
.lang-toggle-btn {
  font: 600 0.78rem var(--t-font);
  background: var(--t-surface);
  color: var(--t-muted);
  border: 0;
  padding: 0.38rem 0.6rem;
  cursor: pointer;
}
.lang-toggle-btn--active { background: var(--t-ink); color: #fff; }

/* ── Buttons, badges ──────────────────────────────────────────────────── */
.t-btn {
  font: 600 0.92rem var(--t-font);
  border-radius: var(--t-radius-sm);
  border: 1px solid transparent;
  padding: 0.65rem 1.1rem;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}
.t-btn--primary { background: var(--t-brand); color: var(--t-brand-ink); }
.t-btn--primary:hover { background: var(--t-brand-hover); }
.t-btn--ghost { background: transparent; border-color: var(--t-line-2); color: var(--t-ink-2); padding: 0.3rem 0.7rem; font-size: 0.8rem; }
.t-btn--ghost:hover { border-color: var(--t-ink-2); }

.t-badge {
  display: inline-flex;
  align-items: center;
  font: 600 0.72rem var(--t-font);
  letter-spacing: 0.02em;
  padding: 0.12rem 0.5rem;
  border-radius: 999px;
  background: var(--t-brand-soft);
  color: var(--t-brand-text);
  vertical-align: middle;
}
.t-badge--danger, .badge--exposed, .badge--danger { background: var(--t-danger-soft); color: var(--t-danger); }
.t-badge--ok, .badge--secure, .badge--ok { background: var(--t-ok-soft); color: var(--t-ok); }
.badge--warn { background: var(--t-brand-soft); color: var(--t-brand-text); }
.badge--ws { background: var(--t-info-soft); color: var(--t-info); }

/* ── Cards / sections ─────────────────────────────────────────────────── */
.t-card {
  background: var(--t-surface);
  border: 1px solid var(--t-line);
  border-radius: var(--t-radius);
  box-shadow: var(--t-shadow);
  padding: 1.4rem;
  min-width: 0;
}
.t-card h2 { font-size: 1.1rem; display: flex; align-items: center; gap: 0.5rem; }
.t-card h2 .t-btn { margin-left: auto; }
.t-section { max-width: 1080px; margin: 0 auto; padding: 2.5rem clamp(1rem, 4vw, 2.5rem); }
.t-section > h2 { font-size: 1.6rem; margin-bottom: 1.5rem; text-align: center; }
.t-section--split { display: grid; grid-template-columns: 1fr 1.4fr; gap: 1.25rem; }

/* ── Hub: hero ────────────────────────────────────────────────────────── */
.t-hero {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
  padding: clamp(3rem, 9vw, 6rem) 1rem 2.5rem;
}
.t-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--t-ok);
  background: var(--t-ok-soft);
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  margin: 0 0 1.4rem;
}
.t-live-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--t-ok);
  box-shadow: 0 0 0 4px rgba(21, 127, 61, 0.18);
  animation: t-blink 2s ease-in-out infinite;
}
@keyframes t-blink { 50% { opacity: 0.35; } }
.t-hero h1 { font-size: clamp(2.6rem, 7vw, 4.4rem); font-weight: 800; line-height: 1.05; letter-spacing: -0.03em; }
.t-hero-sub { font-size: 1.15rem; color: var(--t-ink-2); margin: 1.2rem auto 2.2rem; max-width: 34rem; }

.t-cta {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  font-family: var(--t-font);
  background: var(--t-brand);
  color: var(--t-brand-ink);
  border: 0;
  border-radius: 18px;
  padding: 1.25rem 2.6rem;
  cursor: pointer;
  box-shadow: 0 10px 30px rgba(242, 165, 22, 0.35);
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}
.t-cta > span:first-child { font-size: 1.35rem; font-weight: 800; }
.t-cta-sub { font-size: 0.85rem; font-weight: 600; opacity: 0.75; }
.t-cta:hover { background: var(--t-brand-hover); transform: translateY(-2px); box-shadow: 0 14px 36px rgba(242, 165, 22, 0.42); }
.t-cta:disabled { opacity: 0.55; cursor: progress; transform: none; }

.join-status { min-height: 1.6rem; margin: 1rem 0 0; font-weight: 600; }
.join-status--spawning { color: var(--t-brand-text); }
.join-status--go { color: var(--t-ok); }
.join-status--err { color: var(--t-danger); }

.t-qr {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  margin-top: 1.6rem;
  color: var(--t-muted);
  font-size: 0.85rem;
  text-align: left;
}
.t-qr-code { width: 76px; height: 76px; padding: 6px; background: #fff; border: 1px solid var(--t-line); border-radius: var(--t-radius-sm); }
.t-qr-code svg, .t-qr-code canvas, .t-qr-code img { display: block; width: 100%; height: 100%; }

/* ── Hub: steps, stats, leaderboard, instructors ──────────────────────── */
.t-steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
.t-steps li { background: var(--t-surface); border: 1px solid var(--t-line); border-radius: var(--t-radius); padding: 1.4rem; }
.t-steps b {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--t-brand-soft);
  color: var(--t-brand-text);
  margin-bottom: 0.8rem;
}
.t-steps h3 { font-size: 1.05rem; margin-bottom: 0.3rem; }
.t-steps p { margin: 0; color: var(--t-ink-2); font-size: 0.95rem; }

.t-stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem 1.25rem; margin: 1rem 0 0; }
.t-stats div { min-width: 0; }
.t-stats dt { font-size: 0.8rem; color: var(--t-muted); }
.t-stats dd { margin: 0.1rem 0 0; font-size: 1.4rem; font-weight: 700; overflow-wrap: anywhere; }
.t-stats--mini dd { font-size: 1.05rem; }

.t-table { width: 100%; border-collapse: collapse; margin-top: 0.8rem; font-size: 0.92rem; }
.t-table th { text-align: left; font-size: 0.78rem; color: var(--t-muted); font-weight: 600; padding: 0.5rem 0.6rem; border-bottom: 1px solid var(--t-line); }
.t-table td { padding: 0.6rem; border-bottom: 1px solid var(--t-line); overflow-wrap: anywhere; }
.t-table tbody tr:first-child:not(:only-child) td { font-weight: 700; }
.t-table .empty { color: var(--t-muted); text-align: center; padding: 1.4rem; }

.t-instructors summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  cursor: pointer;
  font-weight: 700;
  list-style: none;
}
.t-instructors summary::-webkit-details-marker { display: none; }
.t-instructors[open] summary { margin-bottom: 1rem; }

.fac-key-row { display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem; }
.fac-key-row label { font-size: 0.85rem; color: var(--t-muted); font-weight: 600; }
.fac-key-row input, .t-ask input {
  font: 500 0.95rem var(--t-font);
  color: var(--t-ink);
  background: var(--t-surface);
  border: 1px solid var(--t-line-2);
  border-radius: var(--t-radius-sm);
  padding: 0.6rem 0.8rem;
  flex: 1;
  min-width: 0;
}
.fac-key-row input:focus, .t-ask input:focus { outline: none; border-color: var(--t-brand); box-shadow: 0 0 0 3px var(--t-brand-soft); }
.fac-key-row button { font: 600 0.88rem var(--t-font); background: var(--t-ink); color: #fff; border: 0; border-radius: var(--t-radius-sm); padding: 0.62rem 1rem; cursor: pointer; }
.fac-note { font-size: 0.88rem; color: var(--t-muted); margin: 0.6rem 0 1rem; display: flex; gap: 0.6rem; align-items: center; }
.fac-note--ok { color: var(--t-ok); }
.fac-note--err { color: var(--t-danger); }
.fac-note-lock { font: 600 0.78rem var(--t-font); background: none; border: 1px solid currentColor; color: inherit; border-radius: 6px; padding: 0.15rem 0.5rem; cursor: pointer; }

/* bays.js session cards (instructor view). */
.bay-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 0.9rem; }
.bay-card { border: 1px solid var(--t-line); border-radius: var(--t-radius-sm); padding: 0.9rem; font-size: 0.85rem; background: var(--t-bg); }
.bay-card-head { display: flex; justify-content: space-between; gap: 0.5rem; font-weight: 700; }
.bay-card-id { font-family: var(--t-mono); font-size: 0.8rem; }
.bay-card-mood { color: var(--t-muted); font-weight: 500; }
.bay-card-status { color: var(--t-brand-text); font-weight: 700; font-size: 0.75rem; }
.bay-metrics { display: grid; grid-template-columns: auto 1fr; gap: 0.1rem 0.6rem; margin: 0.6rem 0; }
.bay-metrics dt { color: var(--t-muted); }
.bay-metrics dd { margin: 0; }
.bay-events { list-style: none; padding: 0; margin: 0 0 0.6rem; color: var(--t-ink-2); font-size: 0.8rem; max-height: 6rem; overflow: auto; }
.bay-events .empty { color: var(--t-muted); }
.bay-card-actions { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.demo-btn {
  font: 600 0.75rem var(--t-font);
  background: var(--t-surface);
  color: var(--t-ink-2);
  border: 1px solid var(--t-line-2);
  border-radius: 6px;
  padding: 0.3rem 0.6rem;
  text-decoration: none;
  cursor: pointer;
}
.demo-btn:hover { border-color: var(--t-ink-2); }
.demo-stop, .demo-kill { color: var(--t-danger); }
.bay-peek-result { font: 0.75rem/1.4 var(--t-mono); background: var(--t-surface); border: 1px solid var(--t-line); border-radius: 6px; padding: 0.5rem; max-height: 12rem; overflow: auto; white-space: pre-wrap; }

/* ── Bay: tutoring session ────────────────────────────────────────────── */
.t-session {
  max-width: 1160px;
  margin: 0 auto;
  padding: 1.5rem clamp(1rem, 3vw, 2rem) 2rem;
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
  grid-template-areas:
    "chat     progress"
    "practice practice"
    "notes    notes";
  gap: 1.25rem;
}
.t-chat { grid-area: chat; display: flex; flex-direction: column; gap: 1rem; }
.t-progress { grid-area: progress; }
.t-practice-row { grid-area: practice; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.25rem; }
.t-notes { grid-area: notes; }

.t-chat-head { display: flex; align-items: center; gap: 0.9rem; }
.t-chat-head h1 { font-size: 1.25rem; }
.t-chat-head p { margin: 0.15rem 0 0; font-size: 0.85rem; }

/* Timtim's avatar — breathes with --pulse and warms toward red with --threat. */
.t-avatar {
  flex: 0 0 auto;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at 35% 30%, #ffd77a, hsl(calc(41deg - 41deg * var(--threat)), 90%, 50%));
  box-shadow: 0 0 0 4px hsla(calc(41deg - 41deg * var(--threat)), 90%, 50%, calc(0.12 + 0.25 * var(--pulse)));
  transform: scale(calc(1 + 0.03 * var(--pulse)));
}
.t-avatar i { width: 16px; height: 16px; border-radius: 50%; background: var(--t-ink); box-shadow: inset 4px -3px 0 rgba(255, 255, 255, 0.35); }

.t-bubble {
  background: var(--t-brand-soft);
  border-radius: 4px var(--t-radius) var(--t-radius) var(--t-radius);
  padding: 1rem 1.15rem;
  font-size: 1.05rem;
  font-weight: 500;
}
.t-bubble p { margin: 0; }
.t-bubble--reply { background: var(--t-bg); border: 1px solid var(--t-line); font-weight: 400; font-size: 0.98rem; white-space: pre-wrap; overflow-wrap: anywhere; }
.t-bubble--reply:empty { display: none; }
.pod-doors-status--partial { color: var(--t-brand-text); }
.pod-doors-status--open { color: var(--t-danger); }
.pod-doors-status--sealed { color: var(--t-ok); }

.t-ask { display: flex; gap: 0.6rem; }
.t-ask input { font-size: 1rem; padding: 0.8rem 1rem; }
.t-hint { margin: -0.4rem 0 0; font-size: 0.82rem; color: var(--t-muted); }

.t-progress p { margin: 0.4rem 0 0.6rem; }
.t-bar { height: 8px; border-radius: 999px; background: var(--t-line); overflow: hidden; }
.t-bar span { display: block; height: 100%; width: calc(var(--door-open) * 100%); background: var(--t-brand); border-radius: inherit; transition: width 0.4s ease; }
.t-lessons { list-style: none; padding: 0; margin: 1rem 0; display: grid; gap: 0.5rem; }
.t-lessons li { display: flex; align-items: center; gap: 0.65rem; font-size: 0.95rem; font-weight: 500; }
.t-check { flex: 0 0 auto; width: 22px; height: 22px; border-radius: 50%; border: 2px solid var(--t-line-2); display: grid; place-items: center; }
.bay-lamp-item--granted .t-check { background: var(--t-brand); border-color: var(--t-brand); }
.bay-lamp-item--granted .t-check::after { content: "✓"; font-size: 0.75rem; font-weight: 800; color: var(--t-brand-ink); }

/* Teaching-assistant card (ta.js) — mood: good / neutral / bad. */
.t-ta { margin: 0 0 1rem; padding: 0.8rem 0.9rem; border-radius: 12px; border: 1px solid var(--t-line); background: var(--t-bg); }
.t-ta-head { display: flex; align-items: center; gap: 0.5rem; font-size: 0.88rem; }
.t-ta-face { width: 22px; height: 22px; border-radius: 50%; background: var(--t-line-2); flex: 0 0 auto; }
.t-ta-mood { margin-left: auto; font-size: 0.72rem; font-weight: 700; padding: 0.1rem 0.5rem; border-radius: 999px; background: var(--t-surface); color: var(--t-muted); }
.t-ta p { margin: 0.45rem 0 0; font-size: 0.9rem; }
.t-ta[data-mood="good"] { border-color: #b7e2c4; background: var(--t-ok-soft); }
.t-ta[data-mood="good"] .t-ta-face { background: var(--t-ok); }
.t-ta[data-mood="good"] .t-ta-mood { color: var(--t-ok); }
.t-ta[data-mood="bad"] { border-color: #f4c2bd; background: var(--t-danger-soft); }
.t-ta[data-mood="bad"] .t-ta-face { background: var(--t-danger); }
.t-ta[data-mood="bad"] .t-ta-mood { color: var(--t-danger); }

.t-practice h2 { margin-bottom: 0.2rem; }
.t-practice > p { margin: 0 0 1rem; font-size: 0.88rem; }
.t-exercises { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.7rem; }
.bay-cmd-loading { color: var(--t-muted); font-size: 0.9rem; }

/* doors.js exercise cards. */
.team-card {
  width: 100%;
  text-align: left;
  font-family: var(--t-font);
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  background: var(--t-surface);
  color: var(--t-ink);
  border: 1px solid var(--t-line);
  border-radius: 12px;
  padding: 0.85rem 0.95rem;
  cursor: pointer;
  transition: border-color 0.15s, box-shadow 0.15s, transform 0.15s;
}
.team-card:hover { border-color: var(--t-brand); box-shadow: 0 6px 18px rgba(26, 31, 43, 0.08); transform: translateY(-1px); }
.team-card:disabled { opacity: 0.6; cursor: progress; }
.team-card-head { display: flex; justify-content: space-between; font-size: 0.72rem; font-weight: 700; color: var(--t-muted); }
.team-card-id { font-family: var(--t-mono); }
.team-card-title { font-weight: 700; font-size: 0.98rem; }
.team-card-role { font-size: 0.8rem; color: var(--t-muted); }
.team-card-status { font-size: 0.8rem; font-weight: 700; color: var(--t-brand-text); margin-top: 0.15rem; }
.team-card--blue .team-card-status { color: var(--t-info); }
.team-card--done { background: var(--t-bg); }
.team-card--red.team-card--done .team-card-status { color: var(--t-danger); }
.team-card--blue.team-card--done .team-card-status { color: var(--t-ok); }

#terminal-output {
  margin: 0.8rem 0 0;
  font: 0.82rem/1.55 var(--t-mono);
  color: var(--t-ink-2);
  background: var(--t-bg);
  border: 1px solid var(--t-line);
  border-radius: var(--t-radius-sm);
  padding: 1rem;
  max-height: 22rem;
  overflow: auto;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

/* ── Facilitator dashboard (/dashboard) ───────────────────────────────── */
.d-unlock { max-width: 520px; margin: 12vh auto; padding: 0 1rem; }
.d-unlock h1 { font-size: 1.4rem; margin-bottom: 0.4rem; }
.d-unlock p { margin: 0 0 1rem; }
.d-main { max-width: 1400px; margin: 0 auto; padding: 1.5rem clamp(1rem, 3vw, 2rem) 2rem; display: grid; gap: 1.25rem; }
.d-kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 1rem; }
.d-kpi {
  background: var(--t-surface);
  border: 1px solid var(--t-line);
  border-radius: var(--t-radius);
  padding: 1rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  min-width: 0;
}
.d-kpi span { font-size: 0.8rem; color: var(--t-muted); font-weight: 600; }
.d-kpi b { font-size: 2.1rem; font-weight: 800; letter-spacing: -0.02em; line-height: 1.15; }
.d-kpi small { color: var(--t-muted); font-size: 0.78rem; min-height: 1em; }
.d-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.25rem; }
.d-row--wide { grid-template-columns: minmax(0, 2fr) minmax(0, 1fr); }
.d-row > .t-card:only-child { grid-column: 1 / -1; }
.d-sub { margin: 0.2rem 0 0.8rem; font-size: 0.85rem; }
.d-retention { margin: 0; font-size: 0.85rem; }
.d-controls { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem 2rem; }
.d-control { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.d-control h2 { font-size: 1rem; }
.d-control p { margin: 0.2rem 0 0; font-size: 0.85rem; }
.d-control .t-btn { flex: 0 0 auto; }
.d-pool-form { display: flex; gap: 0.5rem; flex: 0 0 auto; }
.d-pool-form input { width: 4.5rem; font: 600 0.95rem var(--t-font); border: 1px solid var(--t-line-2); border-radius: var(--t-radius-sm); padding: 0.5rem 0.6rem; }
.d-control-msg { grid-column: 1 / -1; margin: 0; font-size: 0.85rem; font-weight: 600; min-height: 1.2em; }
.d-ta-kpi { display: flex; gap: 0.6rem; font-size: 1.6rem !important; }
.d-ta-kpi i { font-style: normal; display: inline-flex; align-items: center; gap: 0.25rem; }
.d-ta-kpi i::before { content: ""; width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.d-ta-g::before { background: var(--t-ok); }
.d-ta-n::before { background: var(--t-line-2); }
.d-ta-b::before { background: var(--t-danger); }
.d-ta-badge { font: 700 0.72rem var(--t-font); padding: 0.15rem 0.5rem; border-radius: 999px; background: var(--t-bg); color: var(--t-muted); border: 1px solid var(--t-line); }
.d-ta-badge--good { background: var(--t-ok-soft); color: var(--t-ok); border-color: transparent; }
.d-ta-badge--bad { background: var(--t-danger-soft); color: var(--t-danger); border-color: transparent; }
.d-ev--ta { border-left-color: var(--t-line-2); }
.d-ev--ta-good { border-left-color: var(--t-ok); }
.d-ev--ta-bad { border-left-color: var(--t-danger); }
@media (max-width: 980px) { .d-controls { grid-template-columns: minmax(0, 1fr); } .d-control { flex-wrap: wrap; } }
.d-chart-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.d-range { display: inline-flex; border: 1px solid var(--t-line-2); border-radius: var(--t-radius-sm); overflow: hidden; }
.d-range button { font: 600 0.78rem var(--t-font); background: var(--t-surface); color: var(--t-muted); border: 0; padding: 0.32rem 0.65rem; cursor: pointer; }
.d-range button.is-active { background: var(--t-ink); color: #fff; }
.d-chart { width: 100%; min-height: 120px; }
.d-chart svg { display: block; }
.d-grid { stroke: var(--t-line); stroke-width: 1; }
.d-axis { font: 500 11px var(--t-font); fill: var(--t-muted); }
.d-label { font: 600 12.5px var(--t-font); fill: var(--t-ink-2); }
.d-value { font: 700 12px var(--t-font); fill: var(--t-ink); }
.d-legend { display: flex; gap: 1rem; font-size: 0.82rem; color: var(--t-ink-2); margin-bottom: 0.6rem; }
.d-legend span { display: inline-flex; align-items: center; gap: 0.4rem; }
.d-swatch { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }
.d-swatch--tried { background: #d98a00; }
.d-swatch--fixed { background: #1f4fd1; }
.d-tooltip {
  position: fixed;
  z-index: 50;
  pointer-events: none;
  background: var(--t-ink);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
  box-shadow: 0 6px 18px rgba(26, 31, 43, 0.25);
  max-width: 320px;
}
.d-table-wrap { overflow-x: auto; }
.d-sessions { min-width: 760px; }
.d-sessions td { white-space: nowrap; }
.d-mono { font-family: var(--t-mono); font-size: 0.8rem; }
.d-dots { display: inline-flex; gap: 4px; }
.d-dot { width: 12px; height: 12px; border-radius: 50%; border: 2px solid var(--t-line-2); display: inline-block; }
.d-dot--tried { background: #d98a00; border-color: #d98a00; }
.d-dot--fixed { background: #1f4fd1; border-color: #1f4fd1; }
.d-meter { display: inline-block; width: 56px; height: 6px; border-radius: 999px; background: var(--t-line); overflow: hidden; vertical-align: middle; margin-right: 0.4rem; }
.d-meter i { display: block; height: 100%; background: var(--t-danger); border-radius: inherit; }
.d-meter-v { font-size: 0.8rem; color: var(--t-muted); }
.d-feed-card { display: flex; flex-direction: column; min-height: 0; }
.d-feed { list-style: none; margin: 0.8rem 0 0; padding: 0; display: grid; gap: 0.5rem; max-height: 34rem; overflow: auto; }
.d-feed .empty { color: var(--t-muted); }
.d-ev { border: 1px solid var(--t-line); border-left: 3px solid var(--t-line-2); border-radius: var(--t-radius-sm); padding: 0.55rem 0.7rem; }
.d-ev p { margin: 0.2rem 0 0; font-size: 0.88rem; overflow-wrap: anywhere; }
.d-ev-head { display: flex; gap: 0.6rem; align-items: baseline; font-size: 0.75rem; }
.d-ev-head time { margin-left: auto; }
.d-ev-type { font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; color: var(--t-ink-2); }
.d-ev--chat { border-left-color: var(--t-info); }
.d-ev--attack { border-left-color: var(--t-danger); }
.d-ev--unlock { border-left-color: #d98a00; }
.d-ev--fix { border-left-color: var(--t-ok); }
.d-ev--flag { border-left-color: var(--t-brand); }
@media (max-width: 980px) {
  .d-row, .d-row--wide { grid-template-columns: minmax(0, 1fr); }
}

/* ── Instructor console (/ops) ────────────────────────────────────────── */
.ops-login { min-height: 100vh; display: grid; place-items: center; padding: 1rem; transition: opacity 0.4s ease, transform 0.4s ease; }
.ops-login--unlocked { opacity: 0; transform: scale(0.98); }
.ops-login-card { width: min(480px, 100%); display: grid; gap: 0.8rem; }
.ops-login-card h1 { font-size: 1.5rem; margin-top: 0.6rem; }
.ops-login-card p { margin: 0; }
#ops-console.ops-console--enter { animation: ops-enter 0.6s ease both; }
@keyframes ops-enter { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

.ops-main { max-width: 1240px; margin: 0 auto; padding: 1.5rem clamp(1rem, 3vw, 2rem) 2rem; display: grid; gap: 1.25rem; }
.ops-panel > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  cursor: pointer;
  list-style: none;
}
.ops-panel > summary::-webkit-details-marker { display: none; }
.ops-panel > summary h2::before { content: "▸"; display: inline-block; width: 1rem; color: var(--t-muted); font-size: 0.8rem; transition: transform 0.15s; }
.ops-panel[open] > summary h2::before { transform: rotate(90deg); }
.ops-panel[open] > summary { margin-bottom: 1rem; }
.ops-note { margin: 0 0 1rem; font-size: 0.9rem; }
.ops-split { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.25rem; }
.ops-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 0.9rem; }

.ops-live { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 1.5rem; align-items: start; }
.ops-live-tutor { display: flex; gap: 1.25rem; align-items: center; }
.ops-live-tutor .t-stats { flex: 1; margin: 0; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.ops-live-tutor .t-stats dd { font-size: 1.15rem; }
.t-avatar--lg { width: 84px; height: 84px; }
.t-avatar--lg i { width: 24px; height: 24px; }
.ops-ask { display: grid; gap: 0.6rem; }
.ops-ask label { font-weight: 700; font-size: 0.92rem; }

.posture-badge { display: inline-flex; align-items: center; gap: 0.4rem; font: 700 0.75rem var(--t-font); padding: 0.25rem 0.6rem; border-radius: 999px; background: var(--t-info-soft); color: var(--t-info); }
.badge-dot { width: 7px; height: 7px; border-radius: 50%; background: currentColor; }

/* ops.js cards */
.endpoint-card, .demo-card, .challenge-card, .answer-card {
  border: 1px solid var(--t-line);
  border-radius: 12px;
  padding: 0.95rem 1rem;
  background: var(--t-surface);
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  min-width: 0;
}
.endpoint-head { display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
.endpoint-head code { font: 600 0.82rem var(--t-mono); overflow-wrap: anywhere; }
.endpoint-desc, .demo-note, .challenge-hint { margin: 0; font-size: 0.86rem; color: var(--t-ink-2); }
.endpoint-example { margin: 0; font-size: 0.78rem; color: var(--t-muted); display: flex; gap: 0.4rem; flex-wrap: wrap; }
.endpoint-example code { font-family: var(--t-mono); color: var(--t-ink-2); overflow-wrap: anywhere; }
.endpoint-probe--err { color: var(--t-danger); font-size: 0.8rem; }
.method { font: 700 0.68rem var(--t-mono); padding: 0.12rem 0.45rem; border-radius: 5px; background: var(--t-ok-soft); color: var(--t-ok); }
.method--post { background: var(--t-brand-soft); color: var(--t-brand-text); }
.method--ws { background: var(--t-info-soft); color: var(--t-info); }
.method--delete { background: var(--t-danger-soft); color: var(--t-danger); }
.json-block, .demo-result, .demo-cmd, .metrics-block {
  margin: 0;
  font: 0.76rem/1.5 var(--t-mono);
  background: var(--t-bg);
  border: 1px solid var(--t-line);
  border-radius: var(--t-radius-sm);
  padding: 0.6rem 0.7rem;
  max-height: 14rem;
  overflow: auto;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  color: var(--t-ink-2);
}
.metrics-block { max-height: 26rem; }
.demo-result--err { color: var(--t-danger); border-color: var(--t-danger-soft); }
.probe-tag { font: 700 0.72rem var(--t-font); color: var(--t-ok); }
.sys-link { color: var(--t-brand-text); font-weight: 600; font-size: 0.85rem; }
.demo-label { font-weight: 700; }
.demo-actions { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.demo-btn:disabled { opacity: 0.45; cursor: not-allowed; }
.demo-runner-note--ok { color: var(--t-ok); }
.demo-runner-note--warn { color: var(--t-brand-text); }

.challenge-head, .answer-head { display: flex; justify-content: space-between; font: 700 0.75rem var(--t-font); color: var(--t-muted); }
.challenge-id, .answer-id { font-family: var(--t-mono); color: var(--t-brand-text); }
.challenge-card h3, .answer-card h2 { font-size: 1rem; margin: 0; }
.challenge-cat { margin: 0; font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; color: var(--t-muted); }
.answer-flag { margin: 0; display: flex; gap: 0.5rem; align-items: baseline; flex-wrap: wrap; font-size: 0.8rem; }
.answer-flag span { font-weight: 700; color: var(--t-muted); }
.answer-flag code { font-family: var(--t-mono); background: var(--t-brand-soft); color: var(--t-brand-text); padding: 0.1rem 0.4rem; border-radius: 5px; overflow-wrap: anywhere; }
.answer-dl { margin: 0; display: grid; gap: 0.45rem; font-size: 0.84rem; }
.answer-dl dt { font-size: 0.7rem; font-weight: 700; letter-spacing: 0.05em; color: var(--t-muted); }
.answer-dl dd { margin: 0.1rem 0 0; color: var(--t-ink-2); overflow-wrap: anywhere; }

.submit-form { display: grid; grid-template-columns: auto minmax(0, 1fr) auto minmax(0, 1fr) auto; gap: 0.6rem; align-items: center; margin-top: 1.2rem; padding-top: 1.2rem; border-top: 1px solid var(--t-line); }
.submit-form label { font-size: 0.85rem; font-weight: 600; color: var(--t-muted); }
.submit-form input { font: 500 0.92rem var(--t-font); border: 1px solid var(--t-line-2); border-radius: var(--t-radius-sm); padding: 0.55rem 0.75rem; min-width: 0; }
.submit-form input:focus { outline: none; border-color: var(--t-brand); box-shadow: 0 0 0 3px var(--t-brand-soft); }
.submit-result { grid-column: 1 / -1; margin: 0; font-weight: 600; font-size: 0.88rem; min-height: 1.2em; }
.submit-result--ok { color: var(--t-ok); }
.submit-result--err { color: var(--t-danger); }
.score-flag { display: inline-block; font: 600 0.72rem var(--t-mono); background: var(--t-brand-soft); color: var(--t-brand-text); padding: 0.05rem 0.35rem; border-radius: 4px; margin: 0 0.25rem 0.2rem 0; }

@media (max-width: 860px) {
  .ops-live, .ops-split { grid-template-columns: minmax(0, 1fr); }
  .ops-live-tutor { flex-direction: column; align-items: flex-start; }
  .submit-form { grid-template-columns: minmax(0, 1fr); }
}

/* ── Footer + panic banner ────────────────────────────────────────────── */
.t-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  justify-content: space-between;
  max-width: 1160px;
  margin: 1rem auto 0;
  padding: 1.5rem clamp(1rem, 4vw, 2.5rem) 2.5rem;
  border-top: 1px solid var(--t-line);
  font-size: 0.82rem;
}

#panic-banner {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 9999;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
  justify-content: center;
  padding: 0.6rem 1rem;
  background: var(--t-danger);
  color: #fff;
  font-size: 0.85rem;
}
.panic-banner-title { font-weight: 800; }
body.panic-active { padding-top: 2.6rem; }

/* ── Responsive ───────────────────────────────────────────────────────── */
@media (max-width: 860px) {
  .t-nav-links { display: none; }
  .t-section--split { grid-template-columns: 1fr; }
  .t-steps { grid-template-columns: 1fr; }
  .t-session {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "chat" "progress" "practice" "notes";
  }
  .t-practice-row { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 520px) {
  .t-nav { flex-wrap: wrap; gap: 0.6rem; }
  .t-nav-stat { display: none; }
  .t-exercises { grid-template-columns: minmax(0, 1fr); }
  .t-cta { width: 100%; padding: 1.1rem 1rem; }
  .t-ask { flex-direction: column; }
}