/* Pages d'ouvertures (/ouvertures/<slug>/). S'ajoute à landing.css (barre du
   haut, boutons, FAQ, pied de page). Sur ordinateur : le texte à gauche,
   l'échiquier fixe à droite ; sur mobile, l'échiquier suit l'introduction. */
#landing .op-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(340px, 440px); gap: 72px; align-items: start; padding: 48px 0 24px; }
#landing .op-text { max-width: 620px; }
#landing .op-aside { position: sticky; top: 76px; }

/* Texte */
#landing .op-text section { padding: 44px 0 8px; border-top: 0; }
#landing .op-text h2 { margin-bottom: 8px; }
#landing .op-text p { color: var(--text-2); font-size: 16px; line-height: 1.7; }
#landing .op-base { margin-top: 14px; color: var(--primary) !important; font: 500 15px/1.6 "Roboto Mono", ui-monospace, monospace !important; }
#landing .op-intro .lead { margin-top: 10px; }

/* Passages reliés à l'échiquier */
#landing .op-ch { position: relative; padding: 16px 0 16px 20px; border-left: 2px solid var(--line-soft); transition: border-color .2s; }
#landing .op-ch.active { border-left-color: var(--primary); }
#landing .op-ch.op-intro { padding: 0; border: 0; }
#landing .op-ch h3 { font-size: 18px; font-weight: 600; }
#landing .op-ch h3 + p { margin-top: 4px; }
#landing .op-line { margin: 2px 0 6px; color: var(--muted) !important; font: 500 13px/1.6 "Roboto Mono", ui-monospace, monospace !important; }
#landing .op-lesson { margin-top: 6px; color: var(--gold) !important; font-size: 15px !important; font-weight: 500; }
#landing .op-play { margin-top: 6px; border: 0; padding: 0; background: none; color: var(--primary); font: 600 14px/1.5 inherit; font-family: inherit; cursor: pointer; }
#landing .op-play:hover { text-decoration: underline; }

/* Idées */
#landing .op-ideas { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
#landing .op-ideas h3 { font-size: 15px; color: var(--muted); font-weight: 600; }
#landing .op-ideas ul { margin: 8px 0 0; padding-left: 18px; color: var(--text-2); font-size: 15.5px; line-height: 1.6; }
#landing .op-ideas li + li { margin-top: 6px; }

/* En chiffres */
#landing .op-bars { display: grid; gap: 8px; margin: 12px 0 10px; padding: 0; list-style: none; }
#landing .op-bars li { display: grid; grid-template-columns: 64px minmax(0, 1fr) 44px; align-items: center; gap: 12px; }
#landing .op-mv { font: 500 14px "Roboto Mono", ui-monospace, monospace; }
#landing .op-track { height: 8px; border-radius: 4px; background: rgba(221, 234, 255, .07); overflow: hidden; }
#landing .op-track span { display: block; height: 100%; border-radius: 4px; background: var(--primary); }
#landing .op-pc { color: var(--muted); font-size: 13.5px; text-align: right; font-variant-numeric: tabular-nums; }
#landing .op-note { font-size: 14px !important; color: var(--muted) !important; }

/* Échiquier */
#landing .op-viewer { padding: 14px; border: 1px solid var(--line); border-radius: 14px; background: var(--card); box-shadow: 0 30px 80px rgba(0, 0, 0, .45); }
#landing .op-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 10px; }
#landing .op-title { font-size: 14px; font-weight: 600; }
#landing .op-mode { display: inline-flex; padding: 2px; border: 1px solid var(--line); border-radius: 8px; }
#landing .op-mode[hidden] { display: none; }
#landing .op-mode button { border: 0; border-radius: 6px; padding: 3px 10px; background: transparent; color: var(--muted); font: 500 12.5px/1.5 inherit; font-family: inherit; cursor: pointer; }
#landing .op-mode button[aria-pressed="true"] { background: var(--raised); color: var(--text); }
#landing .op-board { display: grid; grid-template-columns: repeat(8, 1fr); aspect-ratio: 1; border-radius: 6px; overflow: hidden; touch-action: manipulation; user-select: none; }
#landing .training .op-board { touch-action: none; }
#landing .op-board.shake { animation: lp-shake .32s; }
#landing .op-sq { position: relative; display: grid; place-items: center; aspect-ratio: 1; }
#landing .op-sq.light { background: #e2ebf8; }
#landing .op-sq.dark { background: #7096d8; }
#landing .op-sq.light.last { background: #f3e6ae; }
#landing .op-sq.dark.last { background: #c8bd7a; }
#landing .op-sq.sel { box-shadow: inset 0 0 0 100px rgba(77, 159, 255, .45); }
#landing .op-sq.hint::after { content: ""; position: absolute; inset: 8%; border: 3px solid var(--gold); border-radius: 50%; }
#landing .training .op-sq { cursor: pointer; }
#landing .op-sq img { width: 88%; height: 88%; pointer-events: none; }
#landing .op-sq img.dragging { position: relative; z-index: 5; filter: drop-shadow(0 6px 10px rgba(0, 0, 0, .35)); }
#landing .op-sq .rk, #landing .op-sq .fl { position: absolute; font-size: 10px; font-weight: 600; line-height: 1; pointer-events: none; }
#landing .op-sq .rk { left: 3px; top: 3px; }
#landing .op-sq .fl { right: 3px; bottom: 3px; }
#landing .op-sq.light .rk, #landing .op-sq.light .fl { color: #7096d8; }
#landing .op-sq.dark .rk, #landing .op-sq.dark .fl { color: #e2ebf8; }
#landing .op-comment { min-height: 44px; margin-top: 10px; color: var(--text-2); font-size: 14px; line-height: 1.5; }
#landing .op-comment .ok { color: #3ecf8e; }
#landing .op-comment .warn { color: var(--gold); }
#landing .op-comment a { color: var(--primary); }
#landing .op-comment button { border: 0; padding: 0; background: none; color: var(--muted); font: inherit; text-decoration: underline; cursor: pointer; }
#landing .op-controls { display: flex; gap: 6px; margin-top: 6px; }
#landing .op-controls button { flex: 1; min-height: 34px; border: 1px solid var(--line); border-radius: 6px; background: rgba(221, 234, 255, .04); color: var(--text); font-size: 13px; cursor: pointer; }
#landing .op-controls button:hover { background: rgba(221, 234, 255, .09); }
#landing .op-controls button[data-act="flip"] { flex: 0 0 44px; }
#landing .training .op-controls button:not([data-act="flip"]) { visibility: hidden; }
#landing .op-moves { display: flex; flex-wrap: wrap; align-items: center; gap: 2px 3px; margin-top: 10px; font: 500 12.5px/1.6 "Roboto Mono", ui-monospace, monospace; }
#landing .op-moves .n { margin-left: 4px; color: var(--dim); }
#landing .op-moves .mv { border: 0; border-radius: 4px; padding: 1px 5px; background: none; color: var(--text); font: inherit; cursor: pointer; }
#landing .op-moves .mv.base { color: var(--muted); }
#landing .op-moves .mv.cur { background: rgba(77, 159, 255, .22); }
#landing .op-moves .mv.hidden { color: var(--dim); cursor: default; }

/* Autres ouvertures */
#landing .op-others { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 0; padding: 0; list-style: none; }
#landing .op-others a { display: inline-flex; padding: 6px 12px; border: 1px solid var(--line); border-radius: 999px; font-size: 14px; font-weight: 500; text-decoration: none; }
#landing .op-others a:hover { border-color: rgba(77, 159, 255, .6); }
#landing .op-others span { display: none; }

/* Page /ouvertures/ */
#landing .op-index { max-width: 820px; padding: 56px 0 40px; }
#landing .op-index section { padding: 36px 0 0; border: 0; }
#landing .op-idx { margin: 10px 0 0; padding: 0; list-style: none; }
#landing .op-idx a { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 2px 24px; padding: 16px 0; border-bottom: 1px solid var(--line-soft); text-decoration: none; }
#landing .op-idx a:hover .op-idx-name { color: var(--primary); }
#landing .op-idx-name { font-size: 17px; font-weight: 600; }
#landing .op-idx-moves { color: var(--muted); font: 500 13.5px/1.9 "Roboto Mono", ui-monospace, monospace; }
#landing .op-idx-lead { grid-column: 2; color: var(--text-2); font-size: 14.5px; }

#landing .op-cta { margin: 40px 0 56px; }

/* Choix de la langue (liens vers la page traduite) */
#landing .lp-lang a { border-radius: 4px; padding: 3px 8px; color: var(--dim); font-size: 11px; font-weight: 600; line-height: 1.5; text-decoration: none; }
#landing .lp-lang a[aria-current="page"] { color: var(--text); background: var(--raised); }
#landing .lp-lang a:not([aria-current]):hover { color: var(--text); }

/* Suggestion de langue (language-redirect.js) */
.language-suggestion { position: fixed; right: 16px; bottom: 16px; z-index: 120; display: flex; width: min(calc(100% - 32px), 470px); align-items: center; gap: 12px; padding: 10px 10px 10px 18px; border: 1px solid rgba(221, 234, 255, .1); border-radius: 12px; background: rgba(12, 19, 32, .96); box-shadow: 0 18px 48px rgba(0, 0, 0, .45); color: #ddeaff; font-family: "Inter", system-ui, sans-serif; }
.language-suggestion p { flex: 1; margin: 0; font-size: 13px; font-weight: 500; line-height: 1.4; }
.language-suggestion a { flex: 0 0 auto; padding: 8px 12px; border-radius: 8px; background: #4d9fff; color: #fff; font-size: 13px; font-weight: 600; text-decoration: none; }
.language-suggestion-dismiss { flex: 0 0 auto; width: 34px; height: 34px; border: 0; border-radius: 8px; padding: 0; background: transparent; color: #949eae; font-size: 1.3rem; line-height: 1; cursor: pointer; }
.language-suggestion-dismiss:hover { color: #ddeaff; }

@media (max-width: 860px) {
  #landing .op-layout { display: flex; flex-direction: column; gap: 0; padding-top: 32px; }
  #landing .op-text { display: contents; }
  #landing .op-intro { order: 0; }
  #landing .op-aside { order: 1; position: static; margin-top: 28px; scroll-margin-top: 64px; }
  #landing .op-text section { order: 2; max-width: 620px; }
  #landing .op-viewer { scroll-margin-top: 64px; }
  #landing .op-ideas { grid-template-columns: 1fr; gap: 12px; }
  #landing .op-idx a { grid-template-columns: 1fr; }
  #landing .op-idx-lead { grid-column: 1; }
}
@media (prefers-reduced-motion: reduce) {
  #landing .op-ch { transition: none; }
}