/* Institutions P1 — student surfaces (Join · Home · Take exam · Self-practice).
 * Ported from design_handoff_institutions onto the appshell.css token system.
 * Every rule is scoped under #lysia-root so it never leaks into the marketing
 * pages, and uses tokens (--accent, --ink, --surface, --border, --ready-green,
 * --slate…) so light/dark re-ink for free. The .rbar/.topic-row/.tag classes
 * are the handoff's shared vocabulary, recreated here (absent from appshell.css)
 * scoped to the student surfaces; promote to appshell.css when other roles need
 * them. */

/* ---- shared: readiness bar -------------------------------------------------- */
#lysia-root .rbar {
  display: block;
  height: 8px;
  border-radius: 999px;
  background: var(--bg-deep);
  border: 1px solid var(--border);
  overflow: hidden;
  flex: 1 1 auto;
  min-width: 0;
}
#lysia-root .rbar > span {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: var(--ready-green);
  transition: width var(--dur-1) var(--ease);
}
#lysia-root .rbar.is-mid > span { background: var(--slate); }
#lysia-root .rbar.is-low > span { background: var(--accent); }

/* ---- shared: topic-row ------------------------------------------------------ */
#lysia-root .topic-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--border);
}
#lysia-root .topic-row:last-child { border-bottom: 0; }
#lysia-root .topic-name {
  flex: 0 0 38%;
  font: 600 14px "Inter", sans-serif;
  color: var(--ink);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
#lysia-root .topic-pct {
  flex: 0 0 44px;
  text-align: right;
  font: 600 12px "JetBrains Mono", ui-monospace, monospace;
  color: var(--ink-muted);
}

/* ---- shared: status tags ---------------------------------------------------- */
#lysia-root .tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: 999px;
  font: 600 11px "Inter", sans-serif;
  letter-spacing: .02em;
  border: 1px solid var(--border-strong);
  color: var(--ink-muted);
  background: var(--surface);
  white-space: nowrap;
}
#lysia-root .tag-active { color: var(--ready-green); border-color: color-mix(in oklab, var(--ready-green) 45%, var(--border)); background: color-mix(in oklab, var(--ready-green) 12%, var(--surface)); }
#lysia-root .tag-tograde { color: var(--accent); border-color: color-mix(in oklab, var(--accent) 45%, var(--border)); background: var(--accent-soft); }
#lysia-root .tag-new { color: var(--slate); border-color: color-mix(in oklab, var(--slate) 45%, var(--border)); }

/* ---- shared: eyebrow / section headers / empty / loading -------------------- */
#lysia-root .inst-mount { max-width: 920px; margin: 0 auto; padding: 4px 0 64px; }
#lysia-root .inst-eyebrow {
  font: 600 12px "JetBrains Mono", ui-monospace, monospace;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 6px;
}
#lysia-root .inst-section-h {
  font: 600 15px "Inter", sans-serif;
  color: var(--ink);
  margin: 0 0 12px;
}
#lysia-root .inst-sec-note,
#lysia-root .inst-loading {
  font: 400 13px "Inter", sans-serif;
  color: var(--ink-muted);
  margin: 0 0 14px;
}
#lysia-root .inst-empty {
  position: relative;
  text-align: center;
  padding: 40px 24px;
  border: 1px dashed var(--border-strong);
  border-radius: 18px;
  background:
    url("assets/g/sapling-01-ghost.webp") no-repeat right clamp(10px, 5%, 44px) bottom / auto 84%,
    var(--surface);
}
#lysia-root .inst-empty-title { font: 600 16px "Inter", sans-serif; color: var(--ink); margin: 0 0 6px; }
/* dark mode: dusk-recolored sapling (the light ghost glowed on dark surfaces) */
:root[data-mode="dark"] #lysia-root .inst-empty { background-image: url("assets/g/sapling-01-ghost-dusk.webp"); }
#lysia-root .inst-empty-body { font: 400 13px "Inter", sans-serif; color: var(--ink-muted); margin: 0 0 18px; max-width: 380px; margin-inline: auto; }
#lysia-root .inst-back { margin-bottom: 18px; }

/* ---- JOIN ------------------------------------------------------------------- */
#lysia-root #surface-inst_join .inst-mount { max-width: 520px; }
#lysia-root .inst-join-card {
  padding: clamp(24px, 4vw, 40px);
  text-align: center;
  animation: lyRise var(--dur-2) var(--ease) both;
}
#lysia-root .inst-join-h { font: 600 26px/1.15 "Newsreader", Georgia, serif; color: var(--ink); margin: 0 0 8px; }
#lysia-root .inst-join-sub { font: 400 14px "Inter", sans-serif; color: var(--ink-muted); margin: 0 0 26px; }
#lysia-root .inst-code-boxes {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}
#lysia-root .inst-code-box {
  width: 44px;
  height: 54px;
  text-align: center;
  font: 600 22px "JetBrains Mono", ui-monospace, monospace;
  text-transform: uppercase;
  color: var(--ink);
  background: var(--surface-raised);
  border: 1.5px solid var(--border-strong);
  border-radius: 12px;
  transition: border-color var(--dur-1) var(--ease), box-shadow var(--dur-1) var(--ease);
}
#lysia-root .inst-code-box:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
#lysia-root .inst-join-field { text-align: left; margin-bottom: 22px; }
#lysia-root .inst-join-field label { display: block; font: 600 12px "Inter", sans-serif; color: var(--ink-muted); margin-bottom: 6px; }
#lysia-root .inst-join-field input {
  width: 100%;
  padding: 11px 14px;
  font: 400 14px "Inter", sans-serif;
  color: var(--ink);
  background: var(--surface-raised);
  border: 1.5px solid var(--border-strong);
  border-radius: 12px;
}
#lysia-root .inst-join-field input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
#lysia-root .inst-join-submit { width: 100%; justify-content: center; }
#lysia-root .inst-join-hint { font: 500 13px "Inter", sans-serif; color: var(--ink-muted); margin: 14px 0 0; min-height: 18px; }
#lysia-root .inst-join-hint.is-ok { color: var(--ready-green); }
#lysia-root .inst-join-hint.is-err { color: var(--accent); }

/* ---- HOME ------------------------------------------------------------------- */
#lysia-root .inst-home-top {
  display: grid;
  grid-template-columns: minmax(240px, 300px) 1fr;
  gap: 24px;
  align-items: start;
  margin: 22px 0 34px;
}
#lysia-root .inst-ring { padding: 26px; text-align: center; position: sticky; top: 18px; }
#lysia-root .inst-ring-inner { display: flex; flex-direction: column; align-items: center; gap: 10px; }
#lysia-root .inst-ring-num { display: flex; align-items: baseline; gap: 2px; }
#lysia-root .inst-ring-pct { font: 600 64px/1 "Newsreader", Georgia, serif; color: var(--ink); }
#lysia-root .inst-ring-unit { font: 600 22px "Newsreader", Georgia, serif; color: var(--ink-muted); }
#lysia-root .inst-ring-label { font: 600 12px "JetBrains Mono", ui-monospace, monospace; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-subtle); }
#lysia-root .inst-ring .rbar { width: 100%; margin-top: 4px; }

#lysia-root .inst-assign-list { display: flex; flex-direction: column; gap: 14px; }
#lysia-root .inst-assign-card { padding: 18px 20px; transition: transform var(--dur-1) var(--ease), box-shadow var(--dur-1) var(--ease); }
#lysia-root .inst-assign-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-2); }
#lysia-root .inst-assign-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 6px 12px; margin-bottom: 6px; }
#lysia-root .inst-assign-title { font: 500 16px/1.3 "Newsreader", Georgia, serif; color: var(--ink); margin: 0; min-width: 16ch; }
#lysia-root .inst-assign-meta { font: 400 12px "Inter", sans-serif; color: var(--ink-muted); margin: 0 0 12px; }
#lysia-root .inst-assign-actions { display: flex; gap: 10px; align-items: center; }
#lysia-root .inst-assign-wait { font: 500 12px "Inter", sans-serif; color: var(--slate); }
#lysia-root .inst-topic-sec { background: var(--surface); border: 1px solid var(--border); border-radius: 18px; padding: 20px 22px; box-shadow: var(--shadow-1); }
#lysia-root .inst-topic-list { margin-top: 6px; }

/* ---- TAKE EXAM -------------------------------------------------------------- */
#lysia-root .inst-exam-sec {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 22px 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-1);
}
#lysia-root .inst-mcq-q, #lysia-root .inst-frq-q { padding: 14px 0; border-bottom: 1px solid var(--border); }
#lysia-root .inst-mcq-q:last-of-type, #lysia-root .inst-frq-q:last-of-type { border-bottom: 0; }
#lysia-root .inst-mcq-prompt { font: 500 14px/1.5 "Inter", sans-serif; color: var(--ink); margin: 0 0 12px; }
#lysia-root .inst-mcq-opts { display: flex; flex-direction: column; gap: 8px; }
#lysia-root .inst-mcq-choice {
  text-align: left;
  padding: 11px 14px;
  font: 400 13px "Inter", sans-serif;
  color: var(--ink);
  background: var(--surface-raised);
  border: 1.5px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  transition: border-color var(--dur-1) var(--ease), background var(--dur-1) var(--ease);
}
#lysia-root .inst-mcq-choice:hover { border-color: var(--border-strong); }
#lysia-root .inst-mcq-choice.is-picked { border-color: var(--accent); background: var(--accent-soft); }
#lysia-root .inst-mcq-choice.is-correct { border-color: var(--ready-green); background: color-mix(in oklab, var(--ready-green) 14%, var(--surface)); color: var(--ink); }
#lysia-root .inst-mcq-choice.is-wrong { border-color: var(--accent); background: var(--accent-soft); }
#lysia-root .inst-exam-bar { display: flex; align-items: center; gap: 14px; margin-top: 18px; flex-wrap: wrap; }
#lysia-root .inst-exam-score { font: 600 13px "Inter", sans-serif; color: var(--ink-muted); }
#lysia-root .inst-frq-file { font: 400 12px "Inter", sans-serif; color: var(--ink-muted); }

/* ---- SELF-PRACTICE ---------------------------------------------------------- */
#lysia-root .inst-sp-split { display: grid; grid-template-columns: 1.2fr 1fr; gap: 22px; align-items: start; }
#lysia-root .inst-sp-pdf { background: var(--surface); border: 1px solid var(--border); border-radius: 18px; overflow: hidden; box-shadow: var(--shadow-1); }
#lysia-root .inst-sp-tabs { display: flex; gap: 4px; padding: 8px; border-bottom: 1px solid var(--border); background: var(--bg-deep); }
#lysia-root .inst-sp-tab { padding: 7px 16px; font: 600 12px "Inter", sans-serif; color: var(--ink-muted); background: transparent; border: 0; border-radius: 10px; cursor: pointer; }
#lysia-root .inst-sp-tab.is-on { color: var(--ink); background: var(--surface-raised); box-shadow: var(--shadow-1); }
#lysia-root .inst-sp-frame { width: 100%; height: 520px; border: 0; background: #fffdf5; display: block; }
#lysia-root .inst-sp-rate { background: var(--surface); border: 1px solid var(--border); border-radius: 18px; padding: 20px 22px; box-shadow: var(--shadow-1); }
#lysia-root .inst-rate-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 11px 0; border-bottom: 1px solid var(--border); }
#lysia-root .inst-rate-row:last-of-type { border-bottom: 0; }
#lysia-root .inst-rate-group { display: flex; gap: 6px; }
#lysia-root .inst-rate-btn {
  padding: 6px 12px;
  font: 600 12px "Inter", sans-serif;
  color: var(--ink-muted);
  background: var(--surface-raised);
  border: 1.5px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  transition: border-color var(--dur-1) var(--ease), color var(--dur-1) var(--ease);
}
#lysia-root .inst-rate-btn:hover { border-color: var(--border-strong); }
#lysia-root .inst-rate-missed.is-on { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }
#lysia-root .inst-rate-shaky.is-on { color: var(--em); border-color: var(--slate); background: color-mix(in oklab, var(--slate) 14%, var(--surface)); }
#lysia-root .inst-rate-got_it.is-on { color: var(--ready-green); border-color: var(--ready-green); background: color-mix(in oklab, var(--ready-green) 14%, var(--surface)); }

/* ---- responsive ------------------------------------------------------------- */
@media (max-width: 900px) {
  #lysia-root .inst-home-top { grid-template-columns: 1fr; }
  #lysia-root .inst-ring { position: static; }
  #lysia-root .inst-sp-split { grid-template-columns: 1fr; }
  #lysia-root .inst-sp-frame { height: 420px; }
}
@media (prefers-reduced-motion: reduce) {
  #lysia-root .inst-join-card { animation: none; }
  #lysia-root .rbar > span,
  #lysia-root .inst-assign-card,
  #lysia-root .inst-mcq-choice,
  #lysia-root .inst-rate-btn { transition: none; }
}