/* Séries d'entraînement · Mathémagique */
.grid-s{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:14px;margin:18px 0 30px}
.sc{display:flex;flex-direction:column;gap:8px;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px;text-decoration:none;color:var(--ink);box-shadow:0 1px 0 rgba(22,33,58,.04),0 10px 28px -14px rgba(22,33,58,.22);transition:transform .15s,border-color .15s}
a.sc:hover{transform:translateY(-2px);border-color:var(--blue)}
.sc .ic{width:48px;height:48px;border-radius:12px;display:grid;place-items:center;background:#EEF2F8;color:var(--blue);font:italic 400 22px/1 Georgia,"Times New Roman",serif}
.sc h3{margin:0;font-size:30px;color:var(--navy)}
.sc p{margin:0;font-size:14px;color:var(--ink2)}
.sc .meta{font:600 12.5px/1.2 Inter,sans-serif;color:var(--ink2)}
.sc.soon{opacity:.7;border-style:dashed}
.sc .tag{align-self:flex-start;margin-top:auto;font:700 11px/1 Inter,sans-serif;letter-spacing:.1em;text-transform:uppercase;padding:6px 9px;border-radius:7px;background:var(--navy);color:#fff}
.sc.soon .tag{background:transparent;color:var(--ink2);border:1.5px dashed var(--ink2)}
.prog{height:9px;border-radius:99px;background:#E9E2D3;overflow:hidden}
.prog i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--orange),var(--green));transition:width .4s}
.progtxt{font:600 13px/1.2 Inter,sans-serif;color:var(--ink2);margin-top:6px}

.filters{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0 4px;position:sticky;top:0;z-index:5;background:var(--paper);padding:10px 0}
.filters button{border:1.5px solid var(--line);background:#fff;color:var(--navy);border-radius:999px;padding:8px 13px;font:600 13px/1 Inter,sans-serif;cursor:pointer}
.filters button[aria-pressed="true"]{background:var(--navy);border-color:var(--navy);color:#fff}
.lvl{font:400 30px/1 "Bebas Neue",Impact,sans-serif;color:var(--blue);margin:26px 0 10px;letter-spacing:.03em}

.ex{background:var(--card);border:1px solid var(--line);border-left:5px solid var(--blue);border-radius:14px;padding:16px 18px;margin:12px 0;box-shadow:0 1px 0 rgba(22,33,58,.04),0 8px 22px -14px rgba(22,33,58,.2)}
.ex.st-ok{border-left-color:var(--green)}
.ex.st-revoir{border-left-color:var(--orange)}
.ex-h{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 10px;margin-bottom:8px}
.ex-n{font:700 12px/1 Inter,sans-serif;letter-spacing:.08em;text-transform:uppercase;color:var(--orangeD)}
.ex-t{font:400 24px/1.05 "Bebas Neue",Impact,sans-serif;color:var(--navy);letter-spacing:.03em}
.chip{margin-left:auto;font:700 11px/1 Inter,sans-serif;letter-spacing:.06em;text-transform:uppercase;border-radius:6px;padding:5px 8px}
.chip.ok{background:#EAF5EE;color:var(--green)} .chip.revoir{background:#FFF4E8;color:var(--orangeD)}
.qq{font-size:16.5px;line-height:1.65;overflow-x:auto}
.acts{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.acts button,.acts a{display:inline-flex;align-items:center;gap:6px;border:1.5px solid var(--navy);background:#fff;color:var(--navy);border-radius:9px;padding:9px 12px;font:600 14px/1 Inter,sans-serif;cursor:pointer;text-decoration:none}
.acts .pri{background:var(--navy);color:#fff}
.acts .vid{border-color:var(--red);color:var(--red)}
.acts button:hover,.acts a:hover{filter:brightness(1.08)}
.hint{margin-top:12px;background:#FFF8E6;border-left:4px solid #F6C453;border-radius:8px;padding:10px 12px;font-size:15px;line-height:1.6;overflow-x:auto}
.hint b.l{font-family:Caveat,cursive;font-size:20px;color:var(--orangeD);font-weight:700;margin-right:4px}
.steps{list-style:none;counter-reset:st;margin:12px 0 0;padding:0;display:grid;gap:8px}
.steps li{counter-increment:st;position:relative;background:var(--paper);border-radius:9px;padding:10px 12px 10px 44px;font-size:15.5px;line-height:1.65;overflow-x:auto;animation:stepin .35s ease}
.steps li:before{content:counter(st);position:absolute;left:10px;top:10px;width:24px;height:24px;border-radius:50%;background:var(--blue);color:#fff;font:700 13px/24px Inter,sans-serif;text-align:center}
@keyframes stepin{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.next{margin-top:10px;border:0;background:var(--blue);color:#fff;border-radius:9px;padding:10px 14px;font:600 14px/1 Inter,sans-serif;cursor:pointer}
.answer{margin-top:10px;background:#EAF5EE;border:1.5px solid var(--green);border-radius:10px;padding:12px 14px;font-size:16px;line-height:1.65;overflow-x:auto;animation:stepin .35s ease}
.answer b.l{display:block;font:700 11px/1 Inter,sans-serif;letter-spacing:.1em;text-transform:uppercase;color:var(--green);margin-bottom:6px}
.video{margin-top:12px;position:relative;aspect-ratio:16/9;border-radius:10px;overflow:hidden;background:#000}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.self{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-top:14px;padding-top:12px;border-top:1px dashed var(--line);font:600 13px/1 Inter,sans-serif;color:var(--ink2)}
.self button{border:1.5px solid var(--line);background:#fff;border-radius:9px;padding:9px 12px;font:600 14px/1 Inter,sans-serif;cursor:pointer}
.self button.ok{color:var(--green)} .self button.revoir{color:var(--orangeD)}
.self button[aria-pressed="true"].ok{background:var(--green);border-color:var(--green);color:#fff}
.self button[aria-pressed="true"].revoir{background:var(--orange);border-color:var(--orange);color:#fff}
.empty{padding:30px 0;color:var(--ink2);text-align:center}
.katex{font-size:1.06em}
.katex-display{margin:.4em 0;overflow-x:auto;overflow-y:hidden}
@media (max-width:640px){
  .filters{flex-wrap:nowrap;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none}
  .filters::-webkit-scrollbar{display:none}
  .filters button{flex:0 0 auto}
  .ex{padding:14px}
}