:root{--bg:#0f1218;--fg:#e8ebf0;--muted:#9aa3b2;--acc:#63b3ff;--warn:#ffb454;--beam:#ffd166;--card:#171b23;--line:#2a3140}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:14px/1.4 system-ui,sans-serif}
header{display:flex;align-items:baseline;gap:16px;padding:10px 16px;border-bottom:1px solid var(--line)}h1{font-size:18px;margin:0}h2{font-size:14px;margin:0 0 6px}
.tag{font-size:11px;background:var(--warn);color:#000;padding:1px 6px;border-radius:4px;margin-left:8px;vertical-align:middle}
.status{margin-left:auto;font-family:ui-monospace,monospace;font-size:12px;color:var(--muted)}.status.pending{color:var(--warn)}.status.stale{color:#ff6b6b}
main{display:grid;grid-template-columns:660px 1fr;gap:16px;padding:12px 16px}canvas{background:var(--card);border:1px solid var(--line);border-radius:6px;max-width:100%}
.muted{color:var(--muted)}.small{font-size:12px}.row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:6px 0}
.tiles{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:10px}.tile{background:var(--card);border:1px solid var(--line);border-radius:6px;padding:8px 12px}
.tile .k{font-size:12px;color:var(--muted)}.tile .v{font-size:26px;font-weight:600}.tile .s{font-size:12px;color:var(--muted)}
.controls{background:var(--card);border:1px solid var(--line);border-radius:6px;padding:8px 12px;margin-bottom:10px}.ctl{display:grid;grid-template-columns:1fr 200px 90px 40px;align-items:center;gap:8px;margin:4px 0}
.ctl label{font-size:13px}input[type=range]{width:100%}input[type=number]{width:90px;background:#0b0e13;color:var(--fg);border:1px solid var(--line);border-radius:4px;padding:2px 4px}
.ctl .sub{grid-column:1/5;margin:-2px 0 4px}
.band{position:relative;height:6px;background:#0b0e13;border:1px solid var(--line);border-radius:3px;margin:0 0 3px}.band-fill{position:absolute;top:0;bottom:0;background:#4caf7a;opacity:.75;border-radius:3px}
.band .pt{position:absolute;top:-3px;width:2px;height:10px;background:var(--fg);opacity:.7}.band .cur{position:absolute;top:-4px;width:2px;height:12px;background:var(--beam)}
select,button{background:#0b0e13;color:var(--fg);border:1px solid var(--line);border-radius:4px;padding:3px 8px}button.small{font-size:11px;padding:1px 6px}button:disabled{opacity:.4}
button.help{font-size:11px;padding:0 6px;border-radius:50%;color:var(--acc);border-color:var(--acc);cursor:help;line-height:16px}
.helptext{background:#0b0e13;border:1px solid var(--line);border-radius:4px;padding:6px 8px;margin:4px 0;color:var(--fg)}
.sw{display:inline-block;width:10px;height:10px;border-radius:2px;margin-right:3px;vertical-align:-1px}
.plot,.inspect{background:var(--card);border:1px solid var(--line);border-radius:6px;padding:8px 12px;margin-bottom:10px}.sentence{font-size:13px;margin:8px 0}
footer{padding:8px 16px;border-top:1px solid var(--line)}.explain{color:var(--fg)}.explain.warn{color:var(--warn)}details summary{cursor:pointer;color:var(--muted);margin:6px 0}
#more-text p{margin:4px 0}
a.btn{background:#0b0e13;color:var(--fg);border:1px solid var(--line);border-radius:4px;padding:3px 8px;text-decoration:none}

.tag.mach{background:#2b3a4f;color:#cfe3ff}.tag.mach.prototype{background:#4a3b1e;color:#ffd9a3}.tag.mach.resolved{background:#1f4a35;color:#b8f0cf}
#machine-note{margin-left:8px}

.offs{display:inline-flex;gap:4px;align-items:center;flex-wrap:wrap}.offs input[type=range]{width:70px}.offs input[type=number]{width:52px}

/* M4-04 guide */
.guide{position:fixed;inset:0;background:none;pointer-events:none;display:flex;align-items:flex-end;justify-content:center;padding:0 16px 12px;z-index:50}
.guide-card{pointer-events:auto}
.guide[hidden]{display:none}   /* M4-09 #2: the class's display:flex beat the hidden attribute, so Done/Skip/Esc never hid the tour */
.guide-card{width:560px;max-width:95vw;background:var(--card);border:1px solid var(--acc);border-radius:8px;padding:12px 14px;box-shadow:0 8px 30px rgba(0,0,0,.5)}
.guide-head{display:flex;align-items:center;gap:10px;margin-bottom:6px}.guide-head #guide-skip{margin-left:auto}
#guide-body p{margin:6px 0;line-height:1.45}#guide-body .why{color:var(--muted);font-size:12px}
.guide-hi{outline:2px solid var(--beam);outline-offset:3px;border-radius:6px;box-shadow:0 0 0 6px rgba(255,209,102,.15)}
#guide-open{margin-left:8px}
button:focus-visible,select:focus-visible,input:focus-visible,a:focus-visible{outline:2px solid var(--beam);outline-offset:2px}

@media (max-width:1100px){main{grid-template-columns:1fr}}

/* M4-07 cited explanations */
.explain-box,.explain-entry{background:#0b0e13;border:1px solid var(--line);border-radius:6px;padding:8px 10px;margin:6px 0}.explain-entry p{margin:4px 0;line-height:1.45}
.cites{color:var(--muted);font-size:11px}.cite{background:#151a23;border:1px solid var(--line);border-radius:3px;padding:0 4px;margin-right:4px;cursor:help}