/* Physics Decoded — styles for lesson content (notes + MCQ quizzes).
Content files use ONLY the classes documented in docs/AUTHORING.md. */
/* ---------- Lesson layout ---------- */
.lesson-head { margin-bottom: 28px; }
.lesson-head h1 { margin: 6px 0 8px; font-size: clamp(1.7rem, 3.6vw, 2.4rem); }
.lesson-head .lead { margin: 0; color: var(--muted); font-size: 1.08rem; max-width: var(--measure); }
.lesson-head .tags { display: flex; gap: 8px; flex-wrap: wrap; }
.lesson-head .meta { color: var(--muted); margin: .4em 0 0; font-size: .9rem; }
.lesson { display: grid; grid-template-columns: minmax(0, 1fr) 240px; gap: 36px; align-items: start; }
.lesson.no-toc { grid-template-columns: minmax(0, 1fr); }
.toc { position: sticky; top: 84px; font-size: .92rem; background: var(--surface); border: 1px solid var(--border);
border-radius: var(--radius); padding: 16px 18px; max-height: calc(100vh - 110px); overflow: auto; }
.toc strong { display: block; margin-bottom: 8px; }
.toc ol { margin: 0; padding-left: 18px; }
.toc li { margin: 4px 0; }
.toc a { color: var(--muted); }
.toc a.active { color: var(--brand-ink); font-weight: 600; }
/* ---------- Notes typography ---------- */
.notes-body { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
padding: 32px clamp(18px, 4vw, 44px); box-shadow: var(--shadow); min-width: 0; }
.notes-body > * { max-width: var(--measure); }
.notes-body h2 { font-size: 1.5rem; margin: 2.2em 0 .6em; padding-bottom: 8px; border-bottom: 2px solid var(--brand-100); scroll-margin-top: 80px; }
.notes-body h2:first-child { margin-top: 0; }
.notes-body h3 { font-size: 1.18rem; margin: 1.6em 0 .5em; color: var(--brand-ink); scroll-margin-top: 80px; }
.notes-body p, .notes-body li { font-size: 1.04rem; }
.notes-body img, .notes-body svg { max-width: 100%; height: auto; }
.notes-body code { font-family: var(--mono); background: var(--surface-2); padding: 1px 6px; border-radius: 4px; font-size: .92em; }
.notes-body hr { border: 0; border-top: 1px solid var(--border); margin: 2em 0; }
/* Tables */
.notes-body table { width: 100%; border-collapse: collapse; margin: 1.2em 0; font-size: .96rem; display: block; overflow-x: auto; }
.notes-body th, .notes-body td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; vertical-align: top; }
.notes-body th { background: var(--surface-2); }
/* Figures */
.notes-body figure { margin: 1.5em 0; text-align: center; }
.notes-body figcaption { color: var(--muted); font-size: .9rem; margin-top: 8px; }
/* Display formula */
.formula { background: var(--surface-2); border-radius: var(--radius-sm); padding: 14px 18px; margin: 1.2em 0;
overflow-x: auto; text-align: center; font-size: 1.08rem; }
.formula .where { display: block; text-align: left; font-size: .92rem; color: var(--muted); margin-top: 8px; }
/* Callout boxes: …
*/
.box { border-left: 5px solid var(--kind, var(--brand-600)); background: var(--kind-bg, var(--brand-100));
border-radius: 0 var(--radius-sm) var(--radius-sm) 0; padding: 14px 18px; margin: 1.3em 0; }
.box > :first-child { margin-top: 0; }
.box > :last-child { margin-bottom: 0; }
.box::before { display: block; font-weight: 800; font-size: .78rem; letter-spacing: .06em; text-transform: uppercase;
color: var(--kind, var(--brand-ink)); margin-bottom: 6px; }
.box[data-title]::before { content: attr(data-title) !important; }
.box.definition { --kind: var(--notes); --kind-bg: var(--notes-bg); } .box.definition::before { content: "Definition"; }
.box.law { --kind: var(--brand-ink); --kind-bg: var(--brand-100); } .box.law::before { content: "Law / Principle"; }
.box.note { --kind: var(--muted); --kind-bg: var(--surface-2); } .box.note::before { content: "Note"; }
.box.tip { --kind: var(--good); --kind-bg: var(--good-bg); } .box.tip::before { content: "Exam tip"; }
.box.warning { --kind: var(--bad); --kind-bg: var(--bad-bg); } .box.warning::before { content: "Common mistake"; }
.box.example { --kind: var(--warn); --kind-bg: var(--warn-bg); } .box.example::before { content: "Worked example"; }
/* Hidden solutions: Solution
…