/* =============================================================================
   Language Model Science — curriculum surface
   Builds on global.css tokens. Accent is cyan (body[data-accent="cyan"]).
============================================================================= */

.lms-wrap {
  padding: 2.5rem 0 5rem;
  max-width: 1120px;
  margin: 0 auto;
}

/* ---------- masthead ------------------------------------------------------ */
.lms-masthead { max-width: 760px; margin-bottom: 2.75rem; }
.lms-back {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px; letter-spacing: .1em;
  color: var(--fg-mute);
  text-decoration: none;
  margin-bottom: 1.5rem;
  transition: color var(--t-base) var(--ease);
}
.lms-back:hover { color: var(--accent); }
.lms-eyebrow {
  font-family: var(--mono);
  font-size: 12px; font-weight: 700;
  text-transform: uppercase; letter-spacing: .18em;
  color: var(--accent);
  display: inline-flex; align-items: center; gap: .55rem;
  margin-bottom: 1rem;
}
.lms-eyebrow-dot {
  width: 8px; height: 8px; border-radius: 99px;
  background: var(--accent); box-shadow: 0 0 10px var(--accent);
}
.lms-masthead h1 {
  font-size: clamp(2.4rem, 6vw, 4.25rem);
  font-weight: 900; letter-spacing: -0.045em; line-height: 1;
  margin: 0 0 1.1rem;
}
.lms-lead {
  font-size: 19px; line-height: 1.6;
  color: var(--fg-dim);
  max-width: 62ch;
  margin: 0 0 1.75rem;
}
.lms-stats { display: flex; flex-wrap: wrap; gap: .6rem; }
.lms-stat {
  font-family: var(--mono); font-size: 12px;
  color: var(--fg-dim);
  padding: .4rem .75rem;
  border: 1px solid var(--border);
  border-radius: 99px;
  background: var(--mat-1);
}
.lms-stat strong { color: var(--accent); font-weight: 700; }

/* ---------- layout -------------------------------------------------------- */
.lms-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 2.5rem;
  align-items: start;
}

/* ---------- rail (syllabus) ---------------------------------------------- */
.lms-rail { position: sticky; top: 96px; }
.lms-rail-toggle {
  display: none;
  width: 100%;
  font-family: var(--mono); font-size: 13px; font-weight: 700;
  letter-spacing: .08em; text-transform: uppercase;
  padding: .8rem 1rem;
  background: var(--mat-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--fg);
  cursor: pointer;
}
.lms-unit { margin-bottom: 1.75rem; }
.lms-unit-head {
  display: flex; align-items: baseline; gap: .6rem;
  margin-bottom: .7rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--border);
}
.lms-unit-n {
  font-family: var(--mono); font-size: 12px; font-weight: 700;
  color: var(--accent); letter-spacing: .05em;
}
.lms-unit-title {
  font-size: 13px; font-weight: 800;
  letter-spacing: .02em;
  text-transform: uppercase;
  color: var(--fg-dim);
}
.lms-unit-lessons { display: flex; flex-direction: column; gap: .15rem; }
.lms-lesson {
  display: flex; align-items: center; justify-content: space-between; gap: .5rem;
  padding: .55rem .7rem;
  border-radius: var(--radius-xs);
  text-decoration: none;
  color: var(--fg-mute);
  border: 1px solid transparent;
  transition: background var(--t-base) var(--ease), color var(--t-base) var(--ease), border-color var(--t-base) var(--ease);
}
.lms-lesson.written { color: var(--fg-dim); }
.lms-lesson:hover {
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  color: var(--fg);
}
.lms-lesson.active {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border-color: color-mix(in srgb, var(--accent) 34%, transparent);
  color: var(--fg);
}
.lms-lesson-title { font-size: 14px; line-height: 1.3; font-weight: 500; }
.lms-lesson.active .lms-lesson-title { font-weight: 650; }

/* ---------- status chips -------------------------------------------------- */
.lms-chip {
  flex: none;
  font-family: var(--mono); font-size: 9.5px; font-weight: 700;
  text-transform: uppercase; letter-spacing: .1em;
  padding: 3px 7px; border-radius: 99px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--fg-mute);
}
.lms-chip-draft {
  background: color-mix(in srgb, var(--c-cyan-1) 15%, var(--bg-soft));
  color: var(--c-cyan-2); border-color: color-mix(in srgb, var(--c-cyan-1) 32%, transparent);
}
.lms-chip-seed {
  background: color-mix(in srgb, var(--c-amber-1) 16%, var(--bg-soft));
  color: var(--c-amber-2); border-color: color-mix(in srgb, var(--c-amber-1) 34%, transparent);
}
.lms-chip-planned {
  background: var(--bg-soft); color: var(--fg-mute);
  border-color: var(--border);
}
:root[data-theme="dark"] .lms-chip-draft { color: var(--c-cyan-1); }
:root[data-theme="dark"] .lms-chip-seed  { color: var(--c-amber-1); }

/* ---------- reading pane -------------------------------------------------- */
.lms-pane {
  min-width: 0;
  background: var(--mat-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(1.5rem, 4vw, 3rem);
}
.lms-crumb {
  font-family: var(--mono); font-size: 12px;
  color: var(--fg-mute); letter-spacing: .04em;
  margin-bottom: .8rem;
}
.lms-crumb-n { color: var(--accent); font-weight: 700; }
.lms-lesson-h {
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  font-weight: 850; letter-spacing: -0.035em; line-height: 1.08;
  margin: 0 0 1rem;
}
.lms-lesson-meta {
  display: flex; align-items: center; flex-wrap: wrap; gap: .75rem;
  margin-bottom: 1.5rem;
}
.lms-scope { font-size: 14px; color: var(--fg-dim); font-style: italic; }
.lms-unit-blurb {
  font-size: 15px; line-height: 1.6;
  color: var(--fg-dim);
  padding: 1rem 1.25rem;
  border-left: 2px solid color-mix(in srgb, var(--accent) 40%, var(--border));
  background: color-mix(in srgb, var(--accent) 5%, transparent);
  border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
  margin: 0 0 2rem;
}

/* body prose */
.lms-body { max-width: 66ch; }
.lms-body p {
  font-size: 17px; line-height: 1.7;
  color: var(--fg-dim);
  margin: 0 0 1.35rem;
}
.lms-body strong { color: var(--fg); font-weight: 700; }
.lms-body em { color: var(--fg); font-style: italic; }
.lms-body h3 {
  font-size: 15px; font-weight: 800;
  text-transform: uppercase; letter-spacing: .06em;
  color: var(--accent);
  margin: 2.25rem 0 .9rem;
}
.lms-body ul { margin: 0 0 1.35rem; padding-left: 1.25rem; }
.lms-body li {
  font-size: 17px; line-height: 1.65;
  color: var(--fg-dim);
  margin-bottom: .6rem;
}
.lms-body li::marker { color: var(--accent); }

.lms-callout {
  margin: 1.75rem 0;
  padding: 1.25rem 1.5rem;
  border: 1px solid color-mix(in srgb, var(--accent) 26%, var(--border));
  background: color-mix(in srgb, var(--accent) 7%, var(--mat-2));
  border-radius: var(--radius-sm);
}
.lms-callout-tag {
  display: inline-block;
  font-family: var(--mono); font-size: 10px; font-weight: 700;
  text-transform: uppercase; letter-spacing: .14em;
  color: var(--accent);
  margin-bottom: .5rem;
}
.lms-callout p { margin: 0; font-size: 16px; line-height: 1.6; color: var(--fg); }

/* planned stub */
.lms-planned {
  max-width: 60ch;
  padding: 2rem;
  border: 1px dashed var(--border-hi);
  border-radius: var(--radius-sm);
  background: var(--mat-2);
}
.lms-planned .lms-chip { margin-bottom: 1rem; }
.lms-planned-scope { font-size: 18px; line-height: 1.6; color: var(--fg); margin: 0 0 1rem; }
.lms-planned-note { font-size: 15px; line-height: 1.6; color: var(--fg-mute); margin: 0; }

/* prev / next */
.lms-lesson-nav {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;
  margin-top: 2.5rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border);
}
.lms-nav-btn {
  display: flex; flex-direction: column; gap: .3rem;
  padding: .9rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  text-decoration: none;
  background: var(--mat-2);
  transition: border-color var(--t-base) var(--ease), transform var(--t-base) var(--ease-out);
}
.lms-nav-btn:last-child { text-align: right; }
.lms-nav-btn:hover { border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); transform: translateY(-2px); }
.lms-nav-btn.is-empty { background: transparent; border-color: transparent; pointer-events: none; }
.lms-nav-dir { font-family: var(--mono); font-size: 11px; letter-spacing: .06em; color: var(--accent); }
.lms-nav-title { font-size: 14px; font-weight: 650; color: var(--fg); line-height: 1.3; }

/* ---------- responsive ---------------------------------------------------- */
@media (max-width: 860px) {
  .lms-layout { grid-template-columns: 1fr; gap: 1.25rem; }
  .lms-rail { position: static; top: auto; }
  .lms-rail-toggle { display: block; }
  .lms-rail-inner {
    display: none;
    margin-top: .75rem;
    padding: 1.25rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--mat-1);
  }
  .lms-rail[data-open] .lms-rail-inner { display: block; }
  .lms-rail[data-open] .lms-rail-toggle { border-bottom-left-radius: 0; border-bottom-right-radius: 0; }
}
@media (max-width: 520px) {
  .lms-lesson-nav { grid-template-columns: 1fr; }
  .lms-nav-btn:last-child { text-align: left; }
}

/* ---------- admin gate (locked card for non-admin visitors) --------------- */
.lms-lock {
  display: grid;
  place-items: center;
  min-height: 60vh;
  padding: 3rem 1.25rem;
}
.lms-lock-card {
  max-width: 420px;
  text-align: center;
  padding: 2.75rem 2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--mat-1);
}
.lms-lock-glyph {
  font-family: var(--mono, "JetBrains Mono", monospace);
  font-size: 1.9rem;
  color: var(--c-cyan-1);
  margin-bottom: .9rem;
}
.lms-lock-card h2 { margin: 0 0 .5rem; font-size: 1.4rem; }
.lms-lock-card p { margin: 0 0 1.6rem; color: var(--muted); }
.lms-lock-back {
  display: inline-block;
  margin-top: 1.1rem;
  font-size: .85rem;
  color: var(--muted);
  text-decoration: none;
}
.lms-lock-back:hover { color: var(--text); }