:root{--bg:#f6f5f2;--panel:#fff;--ink:#1d2430;--mute:#667085;--line:#dcdad3;--accent:#2f6f6a;--accent-ink:#fff;--warn:#b45309;--ok:#2f7d4f;--bar:#1f2937;--bar-ink:#e5e7eb;--sel:#e4efed}
@media (prefers-color-scheme:dark){:root{--bg:#14181f;--panel:#1b212b;--ink:#e6e8ec;--mute:#9aa3b2;--line:#2c3441;--accent:#5fb3ab;--accent-ink:#0d1a19;--warn:#f0a95b;--ok:#6fcf97;--sel:#22343a}}
/* Look (Settings): data-scheme is always set by the app to light or dark (System follows the device); data-page picks the colour of the middle page area. */
:root[data-scheme=dark]{--bg:#14181f;--panel:#1b212b;--ink:#e6e8ec;--mute:#9aa3b2;--line:#2c3441;--accent:#5fb3ab;--accent-ink:#0d1a19;--warn:#f0a95b;--ok:#6fcf97;--sel:#22343a}
:root[data-scheme=light]{--bg:#f6f5f2;--panel:#fff;--ink:#1d2430;--mute:#667085;--line:#dcdad3;--accent:#2f6f6a;--accent-ink:#fff;--warn:#b45309;--ok:#2f7d4f;--sel:#e4efed}
:root{--page-bg:var(--panel);--page-ink:var(--ink)}
:root[data-page=white]{--page-bg:#fff;--page-ink:#1a1a1a}
:root[data-page=paper]{--page-bg:#faf7f0;--page-ink:#2b2a27}
:root[data-page=parchment]{--page-bg:#efe0b9;--page-ink:#3a2d17}
:root[data-page=sage]{--page-bg:#e3ece0;--page-ink:#1f2b21}
:root[data-page=night]{--page-bg:#0f1318;--page-ink:#d8dce3}
:root[data-page=reverse][data-scheme=light]{--page-bg:#14181f;--page-ink:#e6e8ec}
:root[data-page=reverse][data-scheme=dark]{--page-bg:#fbfbf9;--page-ink:#1d2430}
#center,#edwrap,#src,.diagram{background:var(--page-bg);color:var(--page-ink)}
#edwrap .milkdown,#edwrap .ProseMirror{color:var(--page-ink)}
*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{background:var(--bg);color:var(--ink);font:15px/1.45 system-ui,-apple-system,Segoe UI,sans-serif}
button{font:inherit;color:inherit;background:var(--panel);border:1px solid var(--line);border-radius:6px;padding:4px 10px;cursor:pointer}
button:hover{border-color:var(--accent)}
button.primary{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
button.link{border:0;background:none;padding:0;color:var(--accent);text-decoration:underline}
input,textarea,select{font:inherit;color:inherit;background:var(--panel);border:1px solid var(--line);border-radius:6px;padding:6px 8px;width:100%}
#app{display:grid;grid-template-rows:auto 1fr auto auto;height:100dvh}
#top{display:flex;gap:8px;align-items:center;padding:6px 12px;background:var(--bar);color:var(--bar-ink)}
#top button{background:transparent;color:inherit;border-color:#4b5563}
#top .brand{border:0;font-weight:600;padding:0}
.projtitle{opacity:.8}.grow{flex:1}
#cols{display:grid;grid-template-columns:290px minmax(0,1fr) 360px;min-height:0}
#left,#right{display:flex;flex-direction:column;min-height:0;background:var(--panel)}
#left{border-right:1px solid var(--line)}#right{border-left:1px solid var(--line)}
#center{min-height:0;overflow:auto;padding:0;display:flex;flex-direction:column}
.scroll{overflow:auto;min-height:0}
.search{padding:8px}
#tree{flex:1;padding:0 6px 8px}
#helprows{border-top:1px solid var(--line);padding:8px 10px;font-size:13px;color:var(--mute);max-height:22%;overflow:auto}
#helprows p{margin:0 0 4px}
#chat{flex:1;padding:10px}
#composer{display:flex;gap:6px;padding:8px;border-top:1px solid var(--line)}
#composer textarea{resize:none}
#console{height:104px;flex:none;border-top:1px solid var(--line);background:var(--bg);font:12px/1.5 ui-monospace,Menlo,monospace;color:var(--mute);padding:4px 10px}
#console div b{color:var(--ink);font-weight:500}
#status{display:flex;gap:16px;flex-wrap:wrap;padding:4px 12px;background:var(--bar);color:var(--bar-ink);font-size:12px}
#status .warn{color:#fbbf24;cursor:pointer}
#tabs{display:none}
/* tree */
.task{margin:4px 0}
.task>.th{display:flex;align-items:center;gap:6px;padding:5px 6px;font-weight:600;cursor:pointer;border-radius:6px}
.task>.th:hover,.step>.sh:hover,.item:hover{background:var(--sel)}
.step>.sh{display:flex;align-items:center;gap:6px;padding:3px 6px 3px 18px;cursor:pointer;border-radius:6px}
.step.sel>.sh,.item.sel,.task.sel>.th{background:var(--sel)}
.dot{width:9px;height:9px;border-radius:50%;border:2px solid var(--mute);flex:none}
.dot.working{border-color:var(--accent);background:var(--accent)}.dot.done{border-color:var(--ok);background:var(--ok)}.dot.look{border-color:var(--warn);background:var(--warn)}
.cur{font-size:11px;color:var(--accent);border:1px solid var(--accent);border-radius:8px;padding:0 5px}
.item{display:flex;gap:6px;padding:2px 6px 2px 40px;cursor:pointer;border-radius:6px;font-size:14px;color:var(--mute)}
.item.sel{color:var(--ink)}
.add{margin-left:auto;padding:0 6px;border-color:transparent;background:none;color:var(--mute)}
.chev{width:10px;color:var(--mute)}
/* center */
.bar{display:flex;gap:6px;align-items:center;padding:8px 14px;border-bottom:1px solid var(--line);background:var(--panel);flex-wrap:wrap}
.bar h2{margin:0;font-size:16px;flex:1;min-width:120px}
.page{padding:18px 24px;max-width:860px;width:100%;margin:0 auto}
.page h1{margin-top:0}
.card{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:12px 14px;margin:0 0 12px}
.banner{border:1px solid var(--warn);color:var(--ink);background:color-mix(in srgb,var(--warn) 12%,var(--panel));border-radius:8px;padding:10px 12px;margin:0 0 12px}
.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
#edwrap{flex:1;min-height:0;overflow:auto;background:var(--panel)}
#edwrap .milkdown{max-width:860px;margin:0 auto}
#src{width:100%;height:100%;border:0;border-radius:0;font:14px/1.5 ui-monospace,Menlo,monospace;resize:none;padding:16px 24px}
.diagram{padding:12px;overflow:auto;background:var(--panel);flex:1}
.diagram svg{max-width:100%;height:auto}
.split{display:grid;grid-template-columns:1fr 1fr;flex:1;min-height:0}
.split textarea{border-radius:0;border:0;border-right:1px solid var(--line);font:13px/1.5 ui-monospace,Menlo,monospace;resize:none}
/* chat */
.msg{margin:0 0 10px;white-space:pre-wrap;word-wrap:break-word}
.msg .who{font-size:11px;color:var(--mute);display:block}
.msg.user{background:var(--sel);padding:6px 9px;border-radius:8px}
.msg.sys{color:var(--warn);font-size:13px}
.msg .acts{margin-top:4px;display:flex;gap:6px}
.msg .acts button{font-size:12px;padding:1px 8px}
/* help + game */
.tabsrow{display:flex;gap:4px;margin-bottom:12px;flex-wrap:wrap}
.tabsrow button.on{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
.gq{font-weight:600;margin:0 0 10px}
.opt{display:block;width:100%;text-align:left;margin:0 0 6px;padding:8px 10px}
.opt.right{border-color:var(--ok)}.opt.wrong{border-color:var(--warn)}
dialog{border:1px solid var(--line);border-radius:10px;background:var(--panel);color:var(--ink);max-width:560px;width:calc(100% - 32px);padding:18px}
dialog::backdrop{background:rgba(0,0,0,.45)}
dialog h2{margin-top:0}
.mute{color:var(--mute)}
/* mobile */
body.mobile #cols{grid-template-columns:1fr}
body.mobile #left,body.mobile #center,body.mobile #right{display:none;border:0}
body.mobile #app[data-pane=left] #left,body.mobile #app[data-pane=center] #center,body.mobile #app[data-pane=right] #right{display:flex}
body.mobile #tabs{display:grid;grid-template-columns:repeat(3,1fr);background:var(--bar);padding-bottom:env(safe-area-inset-bottom)}
body.mobile #tabs button{background:transparent;color:var(--bar-ink);border:0;border-radius:0;padding:10px}
body.mobile #app[data-pane=left] #tabs [data-pane=left],body.mobile #app[data-pane=center] #tabs [data-pane=center],body.mobile #app[data-pane=right] #tabs [data-pane=right]{box-shadow:inset 0 -3px var(--accent)}
body.mobile .page{padding:14px}
body.mobile .split{grid-template-columns:1fr}
body.mobile #helprows{display:none}
body.mobile #console{height:84px}

.prop{border:1px solid var(--accent);border-radius:8px;padding:8px 10px;margin:0 0 10px;font-size:14px}
.prop.accepted{border-color:var(--ok)}.prop.rejected,.prop.stale{border-color:var(--line);opacity:.7}
.prop .acts{display:flex;gap:6px;margin-top:6px}
.diff{margin:6px 0;max-height:220px;overflow:auto;background:var(--bg);border-radius:6px;padding:6px;font:12px/1.4 ui-monospace,Menlo,monospace;white-space:pre-wrap;word-break:break-word}
.diff .dadd{background:color-mix(in srgb,var(--ok) 22%,transparent)}.diff .ddel{background:color-mix(in srgb,var(--warn) 22%,transparent);text-decoration:line-through}.diff .dsame{color:var(--mute)}
.diagram svg{touch-action:none;user-select:none}.dtools button.on{background:var(--accent);color:var(--accent-ink)}.dtools{border-top:0}