:root{
  --board:#F7F8F5; --ink:#1C1E21; --ink-2:#4A4E4A; --muted:#7A7F78;
  --line:#D9DCD6; --line-2:#E9EBE6;
  --blue:#2A4DB5; --blue-soft:#E4E9F8;
  --green:#237A55; --green-soft:#E3F0E9;
  --pad:#F8ECAF; --pad-line:#E3CF74; --pad-ink:#3A3410;
  --danger:#B3402E;
  --focus:#2A4DB5;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]):not([data-theme="pad"]){
    --board:#1E2023; --ink:#ECEDE8; --ink-2:#C4C7C0; --muted:#8E938C;
    --line:#383B3F; --line-2:#2B2E32;
    --blue:#93A9EE; --blue-soft:#252C40;
    --green:#74C69C; --green-soft:#1F2F28;
    --pad:#3B3620; --pad-line:#5C532B; --pad-ink:#EFE4B0;
    --danger:#E07A66;
    --focus:#93A9EE;
  }
}
:root[data-theme="dark"]{
  --board:#1E2023; --ink:#ECEDE8; --ink-2:#C4C7C0; --muted:#8E938C;
  --line:#383B3F; --line-2:#2B2E32;
  --blue:#93A9EE; --blue-soft:#252C40;
  --green:#74C69C; --green-soft:#1F2F28;
  --pad:#3B3620; --pad-line:#5C532B; --pad-ink:#EFE4B0;
  --danger:#E07A66;
  --focus:#93A9EE;
}
/* yellow legal pad: pale yellow, blue rules, double red margin on the left */
:root[data-theme="pad"]{
  --board:#FBF1B5; --ink:#1D2433; --ink-2:#3E4658; --muted:#6E6A4E;
  --line:#AFC3E3; --line-2:#C9D7EE;
  --blue:#2346A8; --blue-soft:#E2E8F5;
  --green:#1F6E4C; --green-soft:#E6EDD2;
  --pad:#FDF7D2; --pad-line:#AFC3E3; --pad-ink:#1D2433;
  --danger:#B3402E;
  --focus:#2346A8;
  --rule:#A9C0E6; --margin:#E2817C;
}
:root[data-theme="pad"] body{
  background-color:var(--board);
  background-image:repeating-linear-gradient(to bottom,transparent 0 31px,var(--rule) 31px 32px);
  background-attachment:local;
}
:root[data-theme="pad"] .wrap{
  position:relative;
  padding-left:52px;
  min-height:100dvh;
}
:root[data-theme="pad"] .wrap::before{
  content:"";position:absolute;top:0;bottom:0;left:34px;width:5px;pointer-events:none;
  border-left:1.5px solid var(--margin);border-right:1.5px solid var(--margin);
}
:root[data-theme="pad"] .pad{background-image:none;box-shadow:0 0 0 1px var(--pad-line)}
:root[data-theme="pad"] .tick:checked::after{border-color:var(--board)}
:root[data-theme="pad"] dialog{background:var(--board)}
:root[data-theme="pad"] .auth{margin-left:0}
:root[data-theme="pad"] ul.items li{border-bottom-color:transparent}
@media (max-width:420px){
  :root[data-theme="pad"] .wrap{padding-left:40px}
  :root[data-theme="pad"] .wrap::before{left:24px}
}

/* look switch */
.seg{display:inline-flex;border:1px solid var(--line);border-radius:4px;overflow:hidden}
.seg button{font:inherit;font-size:.85rem;background:transparent;color:var(--ink-2);border:0;padding:7px 12px;cursor:pointer}
.seg button+button{border-left:1px solid var(--line)}
.seg button[aria-pressed="true"]{background:var(--ink);color:var(--board)}
.seg button:focus-visible{outline:2px solid var(--focus);outline-offset:-2px}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--board);color:var(--ink);font-family:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;font-size:16px;line-height:1.45}
.wrap{max-width:640px;margin:0 auto;padding:calc(20px + env(safe-area-inset-top)) 16px calc(64px + env(safe-area-inset-bottom))}
header{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);align-items:center;gap:10px;margin-bottom:14px}
header h1{justify-self:start}
header .mid{justify-content:center}
header .meta.right{justify-self:end;gap:12px}
@media (max-width:560px){
  header{display:flex;justify-content:space-between;gap:8px}
  header .mid{flex-direction:column;align-items:center;gap:0}
  header .meta.right{gap:10px}
  header .wd{display:none}
}
.viewsw{background:none;border:0;padding:0;cursor:pointer;font-family:"IBM Plex Mono",ui-monospace,Menlo,monospace;font-size:.78rem;color:var(--muted);white-space:nowrap}
.viewsw span{font-weight:400}
.viewsw .to-pad{color:#E9C94A}
.viewsw .to-dark{color:#2B2E33}
/* light whiteboard: yellow text would vanish, so show it as a yellow highlight */
@media (prefers-color-scheme: light){ :root:not([data-theme]) .viewsw .to-pad{color:#3A3410;background:#F5DF7A;padding:0 3px;border-radius:2px} }
.viewsw:hover span{text-decoration:underline;text-underline-offset:2px}
.viewsw:focus-visible{outline:2px solid var(--focus);outline-offset:2px;border-radius:2px}
h1{font-family:"Caveat","Comic Sans MS",cursive;font-weight:700;font-size:2.6rem;line-height:1;margin:0;letter-spacing:.01em}
.meta{font-family:"IBM Plex Mono",ui-monospace,Menlo,monospace;font-size:.78rem;color:var(--muted);display:flex;gap:10px;align-items:baseline;white-space:nowrap;font-variant-numeric:tabular-nums}
.save{color:var(--muted)}
.save.saving{color:var(--blue)}
.save.err{color:var(--danger)}

/* legal pad quick add */
.pad{background:var(--pad);color:var(--pad-ink);border-radius:4px;padding:10px 12px 12px;box-shadow:0 1px 0 var(--pad-line);margin-bottom:22px;
  background-image:repeating-linear-gradient(transparent 0 27px,var(--pad-line) 27px 28px);background-position:0 8px}
.pad label{display:block;font-family:"Caveat",cursive;font-size:1.15rem;font-weight:500;margin-bottom:4px}
.pad form{display:flex;gap:8px;align-items:stretch}
.pad input[type=text]{flex:1;min-width:0;background:transparent;border:0;border-bottom:1.5px solid var(--pad-ink);color:var(--pad-ink);font:inherit;font-size:1rem;padding:6px 2px;outline:none}
.pad input[type=text]::placeholder{color:var(--pad-ink);opacity:.5}
.pad select,.pad button{font:inherit;font-size:.85rem;border:1.5px solid var(--pad-ink);background:transparent;color:var(--pad-ink);border-radius:3px;padding:4px 8px}
.pad button{font-weight:600;cursor:pointer}
.pad select:focus-visible,.pad button:focus-visible,.pad input:focus-visible{outline:2px solid var(--focus);outline-offset:2px}

/* sections */
section{margin-bottom:22px}
.sec-h{display:flex;align-items:baseline;justify-content:space-between;gap:10px;padding-bottom:6px;border-bottom:2px solid var(--ink);margin-bottom:4px}
.sec-h h2{font-family:"Caveat",cursive;font-weight:700;font-size:1.7rem;margin:0;line-height:1}
.sec-h h2.blue{color:var(--blue)} .sec-h h2.green{color:var(--green)}
.count{font-family:"IBM Plex Mono",monospace;font-size:.78rem;color:var(--muted);font-variant-numeric:tabular-nums}
.tools{display:flex;gap:10px;align-items:baseline}
.linkbtn{background:none;border:0;padding:0;color:var(--muted);font:inherit;font-size:.8rem;cursor:pointer;text-decoration:underline;text-underline-offset:2px}
.linkbtn:hover{color:var(--ink)}
.linkbtn:focus-visible{outline:2px solid var(--focus);outline-offset:2px;border-radius:2px}

ul.items{list-style:none;margin:0;padding:0}
ul.items li{display:flex;align-items:flex-start;gap:10px;padding:8px 0;border-bottom:1px solid var(--line-2)}
ul.items li:last-child{border-bottom:0}
.empty{color:var(--muted);font-size:.9rem;padding:10px 0;font-style:italic}
.tick{appearance:none;-webkit-appearance:none;width:20px;height:20px;flex:0 0 20px;margin-top:2px;border:2px solid var(--ink);border-radius:50%;background:transparent;cursor:pointer;position:relative}
.tick:checked{background:var(--ink)}
.tick:checked::after{content:"";position:absolute;left:5px;top:2px;width:5px;height:9px;border:solid var(--board);border-width:0 2.5px 2.5px 0;transform:rotate(45deg)}
.tick:focus-visible{outline:2px solid var(--focus);outline-offset:2px}
.txt{flex:1;min-width:0;padding:1px 2px;border-radius:2px;word-break:break-word}
.txt:focus{outline:2px solid var(--focus);outline-offset:1px;background:var(--line-2)}
li.done .txt{text-decoration:line-through;color:var(--muted)}
.mv{flex:0 0 auto;font:inherit;font-size:.78rem;color:var(--muted);background:transparent;border:1px solid var(--line);border-radius:3px;padding:2px 4px;max-width:96px;cursor:pointer}
.mv:focus-visible{outline:2px solid var(--focus);outline-offset:1px}
.mv:hover{color:var(--ink);border-color:var(--ink-2)}
ul.items li .when{font-family:"IBM Plex Mono",monospace;font-size:.72rem;color:var(--muted);white-space:nowrap;margin-top:4px}

/* drawers */
.drawers-h{font-family:"Caveat",cursive;font-size:1.25rem;color:var(--muted);margin:28px 0 6px;display:flex;align-items:baseline;gap:8px}
.drawers-h::after{content:"";flex:1;border-bottom:1px dashed var(--line)}
details{border-top:1px solid var(--line)}
details:last-of-type{border-bottom:1px solid var(--line)}
summary{list-style:none;cursor:pointer;display:flex;align-items:baseline;justify-content:space-between;padding:10px 2px;font-family:"Caveat",cursive;font-size:1.45rem;font-weight:700;color:var(--green)}
summary::-webkit-details-marker{display:none}
summary .count{font-family:"IBM Plex Mono",monospace;font-weight:400}
summary:focus-visible{outline:2px solid var(--focus);outline-offset:-2px;border-radius:3px}
details[open] summary{border-bottom:1px dotted var(--line)}
details .body{padding:2px 2px 10px}
details ul.items li{padding:6px 0}
details ul.items .tick{display:none}
details.check ul.items .tick{display:block}
details[data-key="done"] summary{color:var(--muted)}

.lanes{margin-top:34px;font-family:"Caveat",cursive;font-size:1.1rem;color:var(--green);line-height:1.5;text-align:center;opacity:.9}
.lanes span{white-space:nowrap}
.foot{margin-top:18px;text-align:center;font-family:"IBM Plex Mono",monospace;font-size:.7rem;color:var(--muted)}

@media (prefers-reduced-motion:no-preference){
  ul.items li{transition:opacity .15s}
}
@media (max-width:420px){
  h1{font-size:2.2rem}
  .pad form{flex-wrap:wrap}
  .pad input[type=text]{flex-basis:100%}
}

/* ---------- multi-user additions ---------- */
[hidden]{display:none!important}
.meta button.linkbtn{font-family:"IBM Plex Mono",ui-monospace,Menlo,monospace;font-size:.78rem}
.btn{font:inherit;font-size:.9rem;font-weight:600;border:1.5px solid var(--ink);background:var(--ink);color:var(--board);border-radius:4px;padding:9px 14px;cursor:pointer}
.btn.ghost{background:transparent;color:var(--ink)}
.btn.danger{background:transparent;color:var(--danger);border-color:var(--danger)}
.btn:disabled{opacity:.5;cursor:default}
.btn:focus-visible,.field:focus-visible{outline:2px solid var(--focus);outline-offset:2px}
.field{width:100%;font:inherit;font-size:1rem;color:var(--ink);background:transparent;border:0;border-bottom:1.5px solid var(--ink);padding:8px 2px;outline:none;border-radius:0}
.field::placeholder{color:var(--muted)}

/* sign-in */
.auth{max-width:420px;margin:12vh auto 0}
.auth h1{margin-bottom:6px}
.auth .sub{color:var(--ink-2);margin:0 0 26px}
.auth form{display:flex;flex-direction:column;gap:14px;margin-bottom:14px}
.auth .or{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:.85rem;margin:18px 0}
.auth .or::before,.auth .or::after{content:"";flex:1;border-bottom:1px solid var(--line)}
.auth .msg{font-size:.9rem;min-height:1.4em;color:var(--ink-2)}
.auth .msg.err{color:var(--danger)}
.auth .fine{margin-top:30px;font-size:.78rem;color:var(--muted)}
.auth .fine a{color:inherit}
.code{letter-spacing:.4em;font-family:"IBM Plex Mono",ui-monospace,Menlo,monospace;font-size:1.3rem}

/* settings */
dialog{border:1px solid var(--line);border-radius:8px;background:var(--board);color:var(--ink);padding:0;width:min(560px,calc(100vw - 32px));max-height:calc(100dvh - 48px)}
dialog::backdrop{background:rgba(0,0,0,.35)}
.sheet{padding:18px 18px 22px;overflow:auto}
.sheet h2{font-family:"Caveat",cursive;font-size:1.8rem;margin:0 0 4px;line-height:1}
.sheet h3{font-size:.8rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin:22px 0 8px;font-weight:600}
.sheet .who{font-family:"IBM Plex Mono",monospace;font-size:.8rem;color:var(--muted)}
.drow{display:flex;align-items:center;gap:6px;padding:6px 0;border-bottom:1px solid var(--line-2)}
.drow input[type=text]{flex:1;min-width:0;font:inherit;background:transparent;border:0;border-bottom:1px dashed var(--line);color:var(--ink);padding:4px 2px}
.drow input[type=text]:focus{outline:2px solid var(--focus);outline-offset:1px}
.drow .n{font-family:"IBM Plex Mono",monospace;font-size:.72rem;color:var(--muted);min-width:2ch;text-align:right}
.drow label{font-size:.75rem;color:var(--muted);display:flex;align-items:center;gap:3px;white-space:nowrap}
.icon{font:inherit;background:transparent;border:1px solid var(--line);color:var(--ink-2);border-radius:3px;width:28px;height:28px;cursor:pointer;flex:0 0 28px}
.icon:disabled{opacity:.3;cursor:default}
.icon.x{color:var(--danger)}
.icon:focus-visible{outline:2px solid var(--focus);outline-offset:1px}
.addrow{display:flex;gap:8px;margin-top:10px}
.addrow .field{flex:1}
.sheet textarea{width:100%;font:inherit;font-size:.95rem;background:transparent;color:var(--ink);border:1px solid var(--line);border-radius:4px;padding:8px;min-height:64px;resize:vertical}
.sheet .row{display:flex;flex-wrap:wrap;gap:10px}
.sheet .note{font-size:.8rem;color:var(--muted);margin:6px 0 0}
.sheet .close{float:right}
.wide{width:100%}
.mt{margin-top:10px}
.foot.left{text-align:left}
.fatal{margin-top:24px}