/* Playground: online compiler (editor + output) and practice exercises. Uses the theme tokens from tokens.css. */
.pg-view{--cat:var(--c14);max-width:1240px;min-width:0}
.pg-view>*{min-width:0}
.pg-head{display:flex;flex-direction:column;gap:10px;align-items:flex-start}
.pg-head h1{margin:0}
.pg-jump{margin:0}.pg-jump a{color:var(--cat);font-weight:600;text-decoration:none}.pg-jump a:hover{text-decoration:underline}
.pg-back{color:var(--muted);text-decoration:none;font-size:14px}.pg-back:hover{color:var(--ink)}
.pg-tags{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.pg-solved-badge{font:600 12px var(--mono);color:var(--ok)}
.pg-muted{color:var(--muted);margin:0}
.pg-lvl{font:600 11px var(--mono);border-radius:5px;padding:2px 7px;border:1px solid var(--line);color:var(--muted)}
.pg-lvl-easy{color:var(--ok);border-color:color-mix(in srgb,var(--ok) 45%,var(--line))}
.pg-lvl-medium{color:var(--cmp);border-color:color-mix(in srgb,var(--cmp) 45%,var(--line))}
.pg-lvl-hard{color:var(--bad);border-color:color-mix(in srgb,var(--bad) 45%,var(--line))}

/* task */
.pg-task{border:1px solid var(--line);border-radius:10px;background:var(--panel);padding:16px 18px;display:flex;flex-direction:column;gap:10px;line-height:1.6}
.pg-task p{margin:0;max-width:85ch}
.pg-task details summary{cursor:pointer;font-weight:600;color:var(--cat)}
.pg-task ol{margin:8px 0 0;padding-left:22px}
.pg-task code,.pg-expect-note code{font-family:var(--mono);font-size:13px;background:var(--code-bg);border:1px solid var(--line);border-radius:4px;padding:1px 5px;overflow-wrap:anywhere}
.pg-expect pre{margin:8px 0 0}

/* workspace */
.pg-work{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);gap:14px;align-items:start}
.pg-pane{border:1px solid var(--line);border-radius:10px;background:var(--panel);min-width:0;display:flex;flex-direction:column}
.pg-bar{display:flex;flex-wrap:wrap;gap:8px;justify-content:space-between;align-items:center;padding:10px}
.pg-langs{flex-wrap:wrap}
.pg-langs button{padding:6px 12px}
.pg-langs button.on{background:var(--cat)}
.pg-tools{display:flex;flex-wrap:wrap;gap:6px}
.pg-code{display:block;width:100%;box-sizing:border-box;min-height:380px;resize:vertical;border:0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  background:var(--code-bg);color:var(--ink);font-family:var(--mono);line-height:1.5;padding:12px;tab-size:4;white-space:pre;overflow:auto}
.pg-edit .code-host{height:440px}
.pg-stdin-box{padding:8px 10px 0}
.pg-stdin-box summary{cursor:pointer;font-weight:600;font-size:14px}
.pg-stdin{display:block;width:100%;box-sizing:border-box;margin-top:8px;font:13px var(--mono);background:var(--code-bg);color:var(--ink);border:1px solid var(--line);border-radius:6px;padding:8px;resize:vertical}
.pg-actions{display:flex;flex-wrap:wrap;gap:8px;align-items:center;padding:10px}
.pg-kbd{color:var(--muted);font:12px var(--mono);margin-left:auto}
.pg-out-pane{position:sticky;top:76px;max-height:calc(100vh - 96px);overflow:auto}
.pg-out-head{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:12px 14px;border-bottom:1px solid var(--line)}
.pg-status{font:600 12px var(--mono);color:var(--muted);text-align:right}
.pg-status.ok{color:var(--ok)}.pg-status.bad{color:var(--bad)}.pg-status.busy{color:var(--cmp)}
.pg-out{padding:12px 14px;display:flex;flex-direction:column;gap:10px;min-width:0}
.pg-h{margin:4px 0 0;font-size:13px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}
.pg-h.bad{color:var(--bad)}
.pg-pre{margin:0;font:13px/1.5 var(--mono);background:var(--code-bg);border:1px solid var(--line);border-radius:6px;padding:10px;white-space:pre-wrap;overflow-wrap:anywhere;max-height:420px;overflow:auto;color:var(--ink)}
.pg-stderr{border-color:color-mix(in srgb,var(--bad) 45%,var(--line))}
.pg-meta{margin:0;color:var(--muted);font:12px var(--mono)}
.pg-alert{margin:0;padding:10px 12px;border-radius:6px;border:1px solid var(--line)}
.pg-alert.bad,.pg-verdict.bad{border-color:color-mix(in srgb,var(--bad) 50%,var(--line));background:color-mix(in srgb,var(--bad) 9%,var(--panel))}
.pg-verdict{margin:0;padding:10px 12px;border-radius:6px;border:1px solid var(--line)}
.pg-verdict.ok{border-color:color-mix(in srgb,var(--ok) 55%,var(--line));background:color-mix(in srgb,var(--ok) 10%,var(--panel))}
.pg-diags{margin:0;padding-left:18px;display:flex;flex-direction:column;gap:6px;font-size:14px;overflow-wrap:anywhere}
.pg-line{font:600 12px var(--mono);background:none;border:1px solid var(--line);border-radius:4px;color:var(--cat);cursor:pointer;padding:1px 6px}
.pg-raw summary{cursor:pointer;color:var(--muted);font-size:13px;margin-bottom:6px}
.pg-table-wrap{overflow:auto;max-width:100%;max-height:420px;border:1px solid var(--line);border-radius:6px}
.pg-rs,.pg-diff{border-collapse:collapse;font:13px var(--mono);width:max-content;min-width:100%}
.pg-rs th,.pg-rs td,.pg-diff th,.pg-diff td{border-bottom:1px solid var(--line);padding:5px 10px;text-align:left;white-space:pre}
.pg-rs th,.pg-diff th{position:sticky;top:0;background:var(--stage);font-weight:600}
.pg-null{color:var(--muted)}
.pg-diff tr.diff td{background:color-mix(in srgb,var(--bad) 12%,transparent)}
.pg-diff td:first-child{color:var(--muted)}

/* SQL mode: stdin hides, the schema panel shows */
.pg-schema{display:none;border-top:1px solid var(--line);padding:12px 14px}
.pg-work.is-sql .pg-schema{display:block}
.pg-work.is-sql .pg-stdin-box{display:none}
.pg-schema-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.pg-schema-list{display:flex;flex-direction:column;gap:4px}
.pg-tbl summary{cursor:pointer;display:flex;gap:8px;align-items:baseline}
.pg-tbl summary small{color:var(--muted);font-size:12px}
.pg-tbl ul{list-style:none;margin:4px 0 8px;padding:0 0 0 14px;font:13px var(--mono)}
.pg-tbl li{display:flex;gap:8px;justify-content:space-between;border-bottom:1px dashed var(--line);padding:2px 0}
.pg-tbl li small{color:var(--muted)}

/* solution, neighbours */
.pg-solution{border:1px solid var(--line);border-radius:10px;background:var(--panel);padding:14px;display:flex;flex-direction:column;gap:10px}
.pg-solution[hidden]{display:none}
.pg-solution-head{display:flex;justify-content:space-between;align-items:center;gap:8px;flex-wrap:wrap}
.pg-solution h2{margin:0;font-size:17px}
.pg-solution .pg-pre{max-height:none;white-space:pre;overflow:auto}
.pg-neighbours{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap}
.pg-neighbours .btn{max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-decoration:none;color:var(--ink)}

/* exercise list */
.pg-list{display:flex;flex-direction:column;gap:12px;scroll-margin-top:80px}
.pg-list-head{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.pg-list-head h2{margin:0}
.pg-cats{max-width:100%}
.pg-filters{display:flex;gap:8px;flex-wrap:wrap}
.pg-search,.pg-level{background:var(--panel);color:var(--ink);border:1px solid var(--line);border-radius:6px;padding:8px 10px;font:inherit}
.pg-search{flex:1 1 220px;min-width:0}
.pg-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:10px}
.pg-card{display:flex;flex-direction:column;gap:6px;text-align:left;border:1px solid var(--line);border-radius:10px;background:var(--panel);padding:14px;color:var(--ink);text-decoration:none;cursor:pointer;min-width:0;font:inherit;transition:border-color .15s,transform .15s}
.pg-card:hover{border-color:var(--cat);transform:translateY(-1px)}
.pg-card.done{border-color:color-mix(in srgb,var(--ok) 45%,var(--line))}
.pg-card small{color:var(--muted);line-height:1.45}
.pg-card-top{display:flex;gap:6px;align-items:center}
.pg-cat{font:600 11px var(--mono);color:var(--muted)}
.pg-tick{margin-left:auto;color:var(--ok);font-weight:700}

@media(max-width:900px){
  .pg-work{grid-template-columns:minmax(0,1fr)}
  .pg-out-pane{position:static;max-height:none}
  .pg-edit .code-host{height:360px}
}
@media(max-width:520px){
  .pg-edit .code-host{height:320px}
  .pg-code{min-height:300px}
  .pg-kbd{display:none}
  .pg-task{padding:14px}
  .pg-grid{grid-template-columns:minmax(0,1fr)}
}