/* Jump-anywhere search: trigger button + palette dialog. Shared by app and lesson pages. */
.search-trigger{display:inline-flex;align-items:center;gap:10px;min-width:280px;height:40px;padding:0 10px 0 12px;border:1px solid var(--line);border-radius:11px;background:var(--surface-2);color:var(--muted);font:500 13.5px var(--body);cursor:pointer;text-align:left}
.search-trigger:hover{border-color:#39404f;color:var(--ink)}
.search-trigger:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.search-trigger svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;flex:none}
.search-trigger .st-text{flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.search-trigger kbd,.sp kbd{font:600 11px var(--mono);color:var(--muted);border:1px solid var(--line);border-bottom-width:2px;border-radius:6px;padding:1px 6px;background:var(--surface)}
.search-trigger.icon-only{min-width:0;width:40px;justify-content:center;padding:0}
.search-trigger.icon-only .st-text,.search-trigger.icon-only kbd{display:none}
html.sp-open{overflow:hidden}
.sp-root[hidden]{display:none!important}
.sp-root{position:fixed;inset:0;z-index:100;display:flex;justify-content:center;align-items:flex-start;padding:10vh 16px 16px}
.sp-backdrop{position:absolute;inset:0;background:rgba(5,7,11,.66);backdrop-filter:blur(3px)}
.sp{position:relative;width:min(680px,100%);max-height:min(640px,80vh);display:flex;flex-direction:column;background:#171a22;border:1px solid #2e3443;border-radius:18px;box-shadow:0 30px 90px rgba(0,0,0,.55);overflow:hidden}
.sp-head{display:flex;align-items:center;gap:12px;padding:16px 18px;border-bottom:1px solid var(--line)}
.sp-head svg{width:22px;height:22px;fill:none;stroke:var(--accent);stroke-width:2.2;stroke-linecap:round;flex:none}
.sp-head input{flex:1;min-width:0;border:0;background:none;padding:4px 0;font:500 19px var(--body);color:var(--ink);outline:none;width:auto}
.sp-head input::placeholder{color:#5f677a}
.sp-esc{font:600 11px var(--mono);color:var(--muted);border:1px solid var(--line);background:var(--surface-2);border-radius:7px;padding:4px 8px;cursor:pointer}
.sp-esc:hover{color:var(--ink)}
.sp-list{overflow-y:auto;padding:6px 0 10px;overscroll-behavior:contain}
.sp-label{font:700 10.5px var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--muted);padding:12px 20px 6px}
.sp-item{display:flex;align-items:center;gap:12px;padding:9px 18px 9px 17px;border-left:3px solid transparent;color:var(--ink);cursor:pointer}
.sp-item[aria-selected="true"]{background:rgba(94,234,212,.08);border-left-color:var(--accent)}
.sp-icon{min-width:36px;height:34px;padding:0 6px;border-radius:9px;display:grid;place-items:center;font:700 11px var(--mono);color:var(--accent);background:var(--surface-2);border:1px solid var(--line);flex:none}
.sp-text{flex:1;min-width:0}
.sp-text b{display:block;font-weight:600;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sp-text b code{font:600 14px var(--mono);color:var(--accent)}
.sp-text small{display:block;color:var(--muted);font-size:12.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sp-text mark{background:none;color:var(--accent);font-weight:700;text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:3px}
.sp-text small mark{font-weight:600}
.sp-enter{font:600 12px var(--mono);color:var(--muted);border:1px solid var(--line);border-radius:6px;padding:1px 6px;visibility:hidden}
.sp-item[aria-selected="true"] .sp-enter{visibility:visible}
.sp-empty{padding:30px 20px;text-align:center;color:var(--muted);line-height:1.7}
.sp-empty button{border:0;background:none;color:var(--accent);font:inherit;text-decoration:underline;cursor:pointer;padding:0}
.sp-foot{display:flex;gap:16px;align-items:center;padding:10px 18px;border-top:1px solid var(--line);font-size:12px;color:var(--muted);flex-wrap:wrap}
.sp-foot kbd{margin-right:2px}
.sp-scope{margin-left:auto}
@media (max-width:1100px){.topbar .search-trigger{min-width:200px}}
@media (max-width:760px){
  .topbar .search-trigger{min-width:0;width:40px;justify-content:center;padding:0}
  .topbar .search-trigger .st-text,.topbar .search-trigger kbd{display:none}
  .sp-root{padding:0}
  .sp{width:100%;max-height:none;height:100%;border-radius:0;border:0}
  .sp-head{padding:12px 14px;padding-top:max(12px,env(safe-area-inset-top))}
  .sp-head input{font-size:17px}
  .sp-foot{display:none}
  .sp-item{padding:11px 14px 11px 13px}
  .sp-label{padding:14px 16px 6px}
}
@media (prefers-reduced-motion:no-preference){
  .sp-root:not([hidden]) .sp{animation:sp-in .16s ease-out}
  @keyframes sp-in{from{opacity:0;transform:translateY(-8px) scale(.985)}to{opacity:1;transform:none}}
}