/* Otoolia — Banc d'optique (styles limités à .ob / .ob-*) */
.ob-head h1 { font-size: clamp(1.6rem, 4vw, 2.3rem); margin-bottom: .2em; }
.ob-sm { min-height: 34px; padding: 5px 13px; font-size: .88rem; }
.ob-modes { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 12px 0 8px; }
.ob-soon { font-size: .7rem; font-weight: 700; text-transform: uppercase; letter-spacing: .04em; background: var(--ot-surface-2); color: var(--ot-text-soft); border-radius: 999px; padding: 1px 7px; margin-left: 4px; }
.ob-bar { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-bottom: 8px; }
.ob-bar .ot-select { width: auto; min-height: 34px; padding: 4px 8px; font-size: .88rem; }
.ob-add { display: flex; flex-wrap: wrap; gap: 6px; }
.ob-sep { width: 1px; align-self: stretch; background: var(--ot-border); margin: 0 4px; }
.ob-bench { background: #fff; border: 1px solid var(--ot-border); border-radius: var(--ot-radius); overflow: hidden; touch-action: none; cursor: grab; outline: none; position: relative; }
.ob-bench:focus-visible { box-shadow: 0 0 0 3px var(--ot-focus, #2563eb); }
.ob-bench svg { display: block; width: 100%; height: auto; user-select: none; }
.ob-bench [data-id] { cursor: ew-resize; }
.ob-bench .ob-object { cursor: move; }
.ob-hint { font-size: .8rem; color: var(--ot-text-soft); margin: 6px 0 0; }
.ob-opts { display: flex; flex-wrap: wrap; gap: 6px 16px; align-items: center; margin: 10px 0; font-size: .88rem; }
.ob-opts label { display: inline-flex; align-items: center; gap: 6px; }
.ob-opts .ot-select { width: auto; min-height: 32px; padding: 3px 6px; font-size: .86rem; }
.ob-dot { width: 18px; height: 3px; border-radius: 2px; display: inline-block; }
.ob-two { display: grid; gap: var(--ot-space); grid-template-columns: minmax(0, 1fr); margin-top: var(--ot-space); }
@media (min-width: 1000px) { .ob-two { grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); align-items: start; } }
.ob-two > * { min-width: 0; }
.ob-h2 { font-size: 1.05rem; margin: 0 0 10px; }
.ob-row { display: flex; flex-wrap: wrap; gap: 6px 10px; align-items: flex-end; padding: 8px 10px; border: 1px solid var(--ot-border); border-radius: var(--ot-radius-s); margin-bottom: 6px; background: var(--ot-surface); }
.ob-row.is-sel { border-color: var(--ot-brand); box-shadow: 0 0 0 1px var(--ot-brand); }
.ob-row strong { flex: 1 1 100%; font-size: .9rem; }
.ob-f { display: flex; flex-direction: column; gap: 2px; font-size: .74rem; color: var(--ot-text-soft); }
.ob-f .ot-input { width: 96px; min-height: 32px; padding: 3px 7px; font-size: .9rem; }
.ob-chk { display: inline-flex; gap: 5px; align-items: center; font-size: .82rem; padding-bottom: 6px; }
.ob-x { margin-left: auto; border: 0; background: none; font-size: 1.2rem; color: var(--ot-text-soft); cursor: pointer; padding: 0 4px 4px; }
.ob-x:hover { color: #c81e1e; }
.ob-calc { font-size: .95rem; }
.ob-calc h3 { font-size: .98rem; margin: 14px 0 4px; }
.ob-calc h3:first-child { margin-top: 0; }
.ob-calc p { margin: 4px 0; }
.ob-m { overflow-x: auto; overflow-y: hidden; }
.ob-m .katex-display { margin: .45em 0; }
.ob-exp { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-top: 10px; }
.ob-exp > span { font-size: .85rem; color: var(--ot-text-soft); }
.ob-section { margin-top: calc(var(--ot-space) * 1.5); }
.ob-exbar { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-bottom: 10px; }
.ob-exbar .ot-select { width: auto; min-height: 34px; padding: 4px 8px; font-size: .88rem; }
.ob-exprev { background: var(--ot-surface-2); border-radius: var(--ot-radius); padding: 12px; max-height: 760px; overflow: auto; }
.ob-sheet { background: #fff; color: #111; max-width: 210mm; margin: 0 auto 12px; padding: 12mm; box-shadow: 0 1px 6px rgba(0,0,0,.15); font-family: Georgia, "Times New Roman", serif; font-size: 11pt; line-height: 1.4; }
.ob-sh-h { border-bottom: 1.5px solid #111; padding-bottom: 4px; margin-bottom: 8px; }
.ob-sh-h h1 { font-size: 1.35em; margin: 0; color: #111; }
.ob-sh-id { display: flex; gap: 16px; margin-top: 8px; }
.ob-sh-id span { flex: 1; border-bottom: 1px dotted #555; padding-bottom: 12px; }
.ob-sheet h2 { font-size: 1.05em; margin: 10px 0 4px; color: #111; }
.ob-sheet ul, .ob-sheet ol { margin: 0 0 6px; padding-left: 1.4em; }
.ob-sh-fig { margin: 10px 0 4px; text-align: center; }
.ob-sh-fig svg { max-width: 100%; }
.ob-sh-note { font-size: .85em; color: #444; margin: 0; text-align: center; }
.ob-sh-calc h3 { font-size: 1em; margin: 10px 0 2px; }
.ob-sh-calc p { margin: 2px 0; }
.ob-toast { position: fixed; left: 50%; bottom: 20px; transform: translateX(-50%); background: var(--ot-text); color: var(--ot-bg); padding: 8px 16px; border-radius: 10px; font-size: .88rem; z-index: 50; }
.ob-print { display: none; }
@media print {
  body.ob-printing #ot-header, body.ob-printing #ot-footer, body.ob-printing .ot-skip, body.ob-printing .ot-consent,
  body.ob-printing .ob > :not(#ob-print) { display: none !important; }
  body.ob-printing main { padding: 0 !important; margin: 0 !important; max-width: none !important; }
  body.ob-printing { background: #fff !important; }
  .ob-print { display: block !important; }
  .ob-print .ob-sheet { box-shadow: none; margin: 0; padding: 0; max-width: none; break-after: page; page-break-after: always; }
  .ob-print .ob-sheet:last-child { break-after: auto; page-break-after: auto; }
}
@page { size: A4 portrait; margin: 14mm; }
/* seuls les éléments déplaçables captent la souris (les rayons tracés par-dessus ne doivent pas gêner) */
.ob-bench svg line, .ob-bench svg polygon, .ob-bench svg text { pointer-events: none; }
.ob-bench svg [data-id] line, .ob-bench svg [data-id] polygon, .ob-bench svg [data-id] rect { pointer-events: all; }
.ob .katex { position: relative; }   /* ancre le MathML invisible de KaTeX (sinon débordement horizontal sur mobile) */
.ob-formula, .ob-calc { overflow-x: auto; overflow-y: hidden; }
/* Instruments */
.ob-instr { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; margin: 0 0 8px; padding: 8px 12px; border: 1px solid var(--ot-border); border-radius: var(--ot-radius-s); background: var(--ot-surface); font-size: .9rem; }
.ob-in-f { display: inline-flex; align-items: center; gap: 6px; }
.ob-in-f .ot-select { width: auto; min-height: 32px; padding: 3px 8px; font-size: .88rem; }
.ob-in-f .ot-input { width: 76px; min-height: 32px; padding: 3px 6px; font-size: .9rem; }
.ob-in-hint { flex: 1 1 100%; margin: 0; font-size: .82rem; color: var(--ot-text-soft); }
/* Focométrie */
.ob-fo-bar { display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: flex-end; margin-bottom: 8px; font-size: .9rem; }
.ob-fo-f { display: flex; flex-direction: column; gap: 2px; font-size: .78rem; color: var(--ot-text-soft); }
.ob-fo-f .ot-select, .ob-fo-f .ot-input { min-height: 32px; padding: 3px 7px; font-size: .9rem; width: auto; }
.ob-fo-f .ot-input { width: 90px; }
.ob-fo-row { flex-direction: row; align-items: center; gap: 6px; font-size: .86rem; color: var(--ot-text); }
.ob-fo-hint { font-size: .84rem; color: var(--ot-text-soft); margin: 0 0 10px; }
.ob-fo-warn { color: #b45309; font-size: .88rem; margin: 0 0 8px; }
.ob-fo-two { display: grid; gap: var(--ot-space); grid-template-columns: minmax(0, 1fr); }
@media (min-width: 1000px) { .ob-fo-two { grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); align-items: start; } }
.ob-fo-two > * { min-width: 0; }
.ob-fo-tab { max-height: 360px; overflow: auto; }
.ob-fo-t { border-collapse: collapse; width: 100%; font-size: .86rem; font-variant-numeric: tabular-nums; }
.ob-fo-t th, .ob-fo-t td { padding: 4px 8px; border-bottom: 1px solid var(--ot-border); text-align: right; }
.ob-fo-t th { position: sticky; top: 0; background: var(--ot-surface); }
.ob-fo-res { overflow-x: auto; }
.ob-fo-res p { margin: 4px 0; font-size: .92rem; }
.ob-fo-plot { width: 100%; max-width: 380px; display: block; margin: 8px 0; border: 1px solid var(--ot-border); border-radius: 6px; }
/* Exercice interactif */
.ob-exo { display: grid; gap: var(--ot-space); grid-template-columns: minmax(0, 1fr); }
@media (min-width: 900px) { .ob-exo { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }
.ob-exo h3 { font-size: .98rem; margin: 0 0 4px; }
.ob-exo ul { margin: 0 0 10px; padding-left: 1.2em; }
.ob-exo-q { display: flex; flex-wrap: wrap; gap: 6px 12px; align-items: center; margin-bottom: 8px; }
.ob-exo-q .ot-input { width: 96px; min-height: 32px; padding: 3px 7px; display: inline-block; }
.ob-exo-score { margin-left: auto; font-weight: 600; font-size: .9rem; }
.ob-ok { color: #15803d; font-weight: 600; }
.ob-ko { color: #c81e1e; font-weight: 600; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .ob-ok { color: #4ade80; } :root:not([data-theme="light"]) .ob-ko { color: #f87171; } }
:root[data-theme="dark"] .ob-ok { color: #4ade80; } :root[data-theme="dark"] .ob-ko { color: #f87171; }
.ob-fo-tol { min-width: 190px; }
.ob-fo-tol output { font-weight: 600; color: var(--ot-text); }
.ob-fo-tol input[type="range"] { width: 100%; accent-color: var(--ot-brand); }
.ob-bench svg [data-id] polyline { pointer-events: stroke; }
/* Mode « Tracé exact » */
.ob[data-mode="exact"] .ob-thin-only { display: none !important; }
.ob:not([data-mode="exact"]) .ob-exact-only { display: none !important; }
.ob-og { display: contents; }
.ob-flip { align-self: flex-end; }
.ob-tx-plot { margin: 12px 0 0; max-width: 380px; }
.ob-tx-plot svg { width: 100%; height: auto; display: block; border: 1px solid var(--ot-border); border-radius: 6px; background: var(--ot-surface); color: var(--ot-text); }
.ob-tx-plot figcaption { font-size: .8rem; color: var(--ot-text-soft); margin-top: 4px; }
.ob-fsel { min-height: 32px; padding: 3px 6px; font-size: .86rem; width: auto; max-width: 230px; }
.ob-ex { color: var(--ot-text-soft); font-style: italic; font-size: .9rem; }
.ob-explain { margin: 8px 0 0; padding: 8px 12px; border-left: 3px solid var(--ot-brand); background: var(--ot-surface-2); border-radius: 0 var(--ot-radius-s) var(--ot-radius-s) 0; font-size: .9rem; }