:root{
  --bg:#EEF1F5; --surface:#FFFFFF; --surface-2:#E4E9F0; --ink:#18202E; --muted:#566172; --line:#D3DAE4;
  --primary:#22314A; --on-primary:#FFFFFF; --danger:#A8432A;
  --t-scifi:#6A4FD8; --t-climate:#2F8A5B; --t-history:#B5761A; --t-math:#1E6DB0; --t-other:#737C8A;
  --serif:"Literata", Georgia, "Times New Roman", serif;
  --sans:"Atkinson Hyperlegible", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color-scheme: light;
  box-sizing:border-box;
  padding-top:env(safe-area-inset-top,0px);
  padding-bottom:env(safe-area-inset-bottom,0px);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#10141B; --surface:#18202B; --surface-2:#222C3A; --ink:#E7ECF3; --muted:#9AA6B6; --line:#2C3747;
    --primary:#CFDAEA; --on-primary:#10141B; --danger:#E58468;
    --t-scifi:#9B87F5; --t-climate:#4CC08A; --t-history:#E0A341; --t-math:#5AA6E8; --t-other:#9AA3B0;
    color-scheme: dark;
  }
}
:root[data-theme="dark"]{
  --bg:#10141B; --surface:#18202B; --surface-2:#222C3A; --ink:#E7ECF3; --muted:#9AA6B6; --line:#2C3747;
  --primary:#CFDAEA; --on-primary:#10141B; --danger:#E58468;
  --t-scifi:#9B87F5; --t-climate:#4CC08A; --t-history:#E0A341; --t-math:#5AA6E8; --t-other:#9AA3B0;
  color-scheme: dark;
}
*,*::before,*::after{box-sizing:inherit}
html{scroll-padding-top:env(safe-area-inset-top,0px)}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:17px;line-height:1.5;-webkit-font-smoothing:antialiased}
.wrap{max-width:620px;margin:0 auto;padding:18px 18px 120px}
.top{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:22px}
.brand{font-family:var(--serif);font-weight:600;font-size:1.15rem;margin:0}
.save-state{font-size:.8rem;color:var(--muted)}
h1,h2,h3{font-family:var(--serif);font-weight:600;line-height:1.15;margin:0 0 .4em}
h1{font-size:clamp(1.8rem,6.5vw,2.4rem)}
h2{font-size:1.4rem}
p{margin:0 0 .8em}
.muted{color:var(--muted)}
.small{font-size:.88rem}
a{color:inherit}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--t-math);outline-offset:2px;border-radius:6px}
.btn{appearance:none;border:1.5px solid var(--primary);background:transparent;border-radius:999px;padding:.62em 1.2em;cursor:pointer;font-weight:700;line-height:1.2;display:inline-flex;align-items:center;justify-content:center;gap:.4em;text-decoration:none}
.btn.primary{background:var(--primary);color:var(--on-primary)}
.btn.text{border-color:transparent;padding-left:.4em;padding-right:.4em;text-decoration:underline;text-underline-offset:3px;font-weight:400}
.btn.wide{width:100%;padding:.85em 1.2em;font-size:1.05rem}
.btn.danger{border-color:var(--danger);color:var(--danger)}
.btn:disabled{opacity:.5;cursor:default}
.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px;align-items:center}
fieldset{border:0;padding:0;margin:0 0 22px}
legend{font-weight:700;margin-bottom:10px;padding:0}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{appearance:none;border:1.5px solid var(--line);background:var(--surface);border-radius:12px;padding:.6em .95em;cursor:pointer;text-align:left;min-width:4.5em}
.chip[aria-pressed="true"]{border-color:var(--primary);background:var(--primary);color:var(--on-primary)}
.chip small{display:block;font-size:.78rem;opacity:.8}
.due-note{margin-top:18px;font-size:.95rem}

/* The pick: a book spine in the track's colour */
.pick{--track:var(--t-other);background:var(--surface);border:1px solid var(--line);border-radius:16px;display:grid;grid-template-columns:16px 1fr;overflow:hidden}
.pick .spine{background:var(--track)}
.pick .body{padding:22px 22px 20px}
.trackname{color:var(--track);font-weight:700;font-size:.92rem;margin-bottom:.5em}
.pick h2,.session h2{font-size:clamp(1.75rem,6.5vw,2.35rem);line-height:1.1;margin-bottom:.15em;letter-spacing:-.01em}
.author{color:var(--muted);margin-bottom:1em}
.plan{font-family:var(--serif);font-size:1.12rem;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:.7em 0;margin:0 0 1em}
.why{list-style:none;padding:0;margin:0}
.why li{padding-left:1.1em;position:relative;margin-bottom:.45em}
.why li::before{content:"";position:absolute;left:0;top:.62em;width:.45em;height:.45em;border-radius:50%;background:var(--track)}
.blurb{font-family:var(--serif);font-style:italic;margin-top:.9em;color:var(--muted)}

.session{--track:var(--t-other)}
.timer{font-family:var(--serif);font-size:clamp(3.5rem,18vw,5.5rem);font-variant-numeric:tabular-nums;line-height:1;margin:.25em 0 .2em}
.bar{height:10px;border-radius:99px;background:var(--surface-2);overflow:hidden}
.bar span{display:block;height:100%;background:var(--track);width:0;transition:width .6s linear}
@media (prefers-reduced-motion:reduce){.bar span{transition:none}}
.soft{background:var(--surface);border-left:5px solid var(--track);padding:.8em 1em;border-radius:8px;margin-top:16px}

label.field{display:block;margin-bottom:16px}
label.field > span{display:block;font-weight:700;margin-bottom:6px}
input[type=text],input[type=number],select,textarea{width:100%;border:1.5px solid var(--line);background:var(--surface);border-radius:10px;padding:.6em .75em}
textarea{resize:vertical;min-height:4.2em}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.draft{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:12px 14px;margin-bottom:12px}
.draft .keep{display:flex;gap:8px;align-items:center;font-weight:700;margin-bottom:8px}
.draft textarea{min-height:2.6em;margin-bottom:8px}

.lib-actions{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0}
details.howto{margin-bottom:16px;font-size:.92rem}
details.howto summary{cursor:pointer;color:var(--muted)}
.filters{display:flex;gap:8px;overflow-x:auto;padding-bottom:6px;margin-bottom:10px}
.filters .chip{white-space:nowrap;min-width:0;padding:.45em .8em;font-size:.9rem}
.books{list-style:none;padding:0;margin:0}
.book{display:grid;grid-template-columns:8px 1fr auto;gap:12px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:10px 12px 10px 0;margin-bottom:8px;cursor:pointer;overflow:hidden}
.book .spine{align-self:stretch;background:var(--track)}
.book .t{font-family:var(--serif);font-weight:600;line-height:1.25}
.book .a{color:var(--muted);font-size:.86rem}
.book .s{font-size:.8rem;color:var(--muted);text-align:right}
.empty{background:var(--surface);border:1.5px dashed var(--line);border-radius:14px;padding:22px}

.flash{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:24px;min-height:12em}
.flash .front{font-family:var(--serif);font-size:1.3rem;line-height:1.35;white-space:pre-wrap}
.flash .back{border-top:1px solid var(--line);margin-top:16px;padding-top:16px;white-space:pre-wrap}
.grades{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:16px}
.grades .btn{flex-direction:column;padding:.6em .3em;border-radius:12px;font-size:.92rem}
.grades small{font-weight:400;font-size:.75rem;opacity:.8}

.stats{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:22px}
.stat{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:14px}
.stat b{display:block;font-family:var(--serif);font-size:1.9rem;line-height:1.1}
.stat span{font-size:.86rem;color:var(--muted)}
.week{display:grid;grid-template-columns:repeat(7,1fr);gap:6px;align-items:end;height:120px;margin:8px 0 4px}
.week .col{display:flex;flex-direction:column-reverse;gap:2px;height:100%;background:var(--surface-2);border-radius:6px;overflow:hidden}
.week .seg{background:var(--track)}
.weeklab{display:grid;grid-template-columns:repeat(7,1fr);gap:6px;font-size:.75rem;color:var(--muted);text-align:center}
.balance{display:flex;height:16px;border-radius:99px;overflow:hidden;background:var(--surface-2);margin:8px 0}
.balance span{background:var(--track)}
.legend{display:flex;flex-wrap:wrap;gap:6px 14px;font-size:.84rem;color:var(--muted)}
.legend i{display:inline-block;width:.7em;height:.7em;border-radius:3px;background:var(--track);margin-right:.35em}
section.block{margin-bottom:28px}

nav.tabs{position:fixed;left:0;right:0;bottom:0;background:var(--surface);border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom,0px);z-index:5}
nav.tabs .in{max-width:620px;margin:0 auto;display:grid;grid-template-columns:repeat(5,1fr)}
nav.tabs a{text-decoration:none;text-align:center;padding:12px 4px 13px;font-size:.92rem;color:var(--muted);position:relative}
nav.tabs a[aria-current="page"]{color:var(--ink);font-weight:700}
nav.tabs a[aria-current="page"]::before{content:"";position:absolute;top:0;left:28%;right:28%;height:3px;border-radius:0 0 3px 3px;background:var(--ink)}
.badge{display:inline-block;min-width:1.4em;padding:0 .35em;border-radius:99px;background:var(--primary);color:var(--on-primary);font-size:.72rem;font-weight:700;margin-left:.3em;line-height:1.5}

dialog{border:1px solid var(--line);border-radius:16px;background:var(--surface);color:var(--ink);padding:22px;width:min(560px,94vw);max-height:88vh}
dialog::backdrop{background:rgba(10,14,20,.45)}
.notes-list{border-top:1px solid var(--line);margin-top:14px;padding-top:12px}
.note{font-size:.92rem;margin-bottom:12px}
.note b{display:block}
.toast{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(70px + env(safe-area-inset-bottom,0px));background:var(--ink);color:var(--bg);padding:.6em 1em;border-radius:10px;font-size:.92rem;z-index:20;max-width:90vw}
/* For-you panel and brain */
.foryou{border-top:1px solid var(--line);margin-top:16px;padding-top:14px}
.foryou h3{font-family:var(--sans);font-size:.92rem;font-weight:700;color:var(--track);margin:0 0 .4em}
.foryou .fy{font-family:var(--serif);font-size:1.08rem;line-height:1.45;margin-bottom:.5em}
.linkchips{display:flex;flex-wrap:wrap;gap:6px;margin:.4em 0 .8em}
.notechip{appearance:none;border:1px solid var(--line);background:var(--surface-2);border-radius:999px;padding:.15em .7em;font-size:.82rem;cursor:pointer;text-decoration:none;color:var(--ink)}
.fb{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-size:.92rem}
.fb .btn{padding:.4em .9em;font-size:.9rem}
.thinking{color:var(--muted);font-style:italic}
.tell{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:16px;margin:16px 0 26px}
.folder{margin-bottom:24px}
.folder-h{display:flex;justify-content:space-between;align-items:baseline;gap:10px;border-bottom:1px solid var(--line);padding-bottom:6px;margin-bottom:8px}
.folder-h h2{margin:0;font-size:1.2rem}
.folder p.desc{font-size:.86rem;color:var(--muted);margin:0 0 8px}
.notes{list-style:none;margin:0;padding:0}
.notes li{padding:9px 2px;border-bottom:1px solid var(--line);cursor:pointer}
.notes li b{font-family:var(--serif);font-weight:600}
.notes li span{display:block;color:var(--muted);font-size:.86rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.notebody{font-family:var(--serif);line-height:1.6;white-space:pre-wrap;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:16px;margin-bottom:12px}
.wikilink{appearance:none;border:0;background:none;padding:0;color:var(--t-math);text-decoration:underline;text-underline-offset:2px;cursor:pointer;font:inherit}
.implist{list-style:none;padding:0;margin:12px 0;max-height:45vh;overflow:auto;border:1px solid var(--line);border-radius:10px}
.implist li{display:flex;gap:10px;align-items:flex-start;padding:8px 10px;border-bottom:1px solid var(--line);font-size:.92rem}
.implist li:last-child{border-bottom:0}
.implist small{display:block;color:var(--muted)}
.steps{padding-left:1.3em;font-size:.92rem}
.steps li{margin-bottom:.35em}
/* v1: scene picker, check rows */
.scenes{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:6px}
.scene{appearance:none;border:2px solid var(--line);background:var(--surface);border-radius:14px;padding:0;overflow:hidden;cursor:pointer;text-align:left;display:flex;flex-direction:column}
.scene svg{display:block;width:100%;height:auto;aspect-ratio:3/2}
.scene span{padding:.45em .7em .55em;font-size:.9rem;line-height:1.25}
.scene[aria-pressed="true"]{border-color:var(--primary);box-shadow:0 0 0 2px var(--primary)}
.scenes.has-pick .scene[aria-pressed="false"]{opacity:.55}
@media (prefers-reduced-motion:no-preference){.scene{transition:opacity .2s,box-shadow .2s}}
.check{display:flex;gap:10px;align-items:center;margin-bottom:16px;font-weight:700}
/* AI mode chat */
.chat{display:flex;flex-direction:column;gap:10px;margin:16px 0}
.msg{max-width:88%;padding:.6em .85em;border-radius:14px;white-space:pre-wrap;line-height:1.45}
.msg.coach{background:var(--surface);border:1px solid var(--line);align-self:flex-start;font-family:var(--serif)}
.msg.me{background:var(--primary);color:var(--on-primary);align-self:flex-end}
.composer{position:sticky;bottom:calc(52px + env(safe-area-inset-bottom,0px));background:var(--bg);padding:10px 0 4px}
.composer .actions{margin-top:8px}
.mic[aria-pressed="true"]{border-color:var(--danger);color:var(--danger)}
@media (max-width:380px){.grades{grid-template-columns:repeat(2,1fr)}.row2{grid-template-columns:1fr}}