:root { color-scheme:light; --ink:#292b28; --muted:#62675f; --blue:#315e91; --paper:#fffefa; --wash:#f7f6f2; --line:#d6d8ce; --control:#899083; --soft:#ebeee7; --nav:#efeee8; --code:#eeeee7; --button:#303e35; --button-ink:#ffffff; --focus:#9b5000; }
:root[data-theme="dark"] { color-scheme:dark; --ink:#e3e6df; --muted:#adb5a8; --blue:#a1c0e5; --paper:#222620; --wash:#191c18; --line:#434b3f; --control:#87917f; --soft:#30382c; --nav:#1e221c; --code:#181c16; --button:#cedac4; --button-ink:#20291b; --focus:#f0c27c; }
@media(prefers-color-scheme:dark) { :root:not([data-theme="light"]) { color-scheme:dark; --ink:#e3e6df; --muted:#adb5a8; --blue:#a1c0e5; --paper:#222620; --wash:#191c18; --line:#434b3f; --control:#87917f; --soft:#30382c; --nav:#1e221c; --code:#181c16; --button:#cedac4; --button-ink:#20291b; --focus:#f0c27c; } }
* { box-sizing:border-box; }
body { margin:0; color:var(--ink); background:var(--wash); font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif; font-size:1rem; line-height:1.65; }
button,input,textarea,select { font:inherit; }
a { color:var(--blue); text-underline-offset:.2em; }
button { cursor:pointer; }
button:disabled { cursor:default; opacity:.6; }
:focus-visible { outline:.18rem solid var(--focus); outline-offset:.2rem; }
h1:focus { outline:none; }
[hidden] { display:none!important; }
.sidebar { position:fixed; inset:0 auto 0 0; display:flex; flex-direction:column; width:13rem; padding:2rem 1.2rem; background:var(--nav); border-right:1px solid var(--line); }
.brand { color:var(--ink); font-weight:650; font-size:1.05rem; text-decoration:none; }
.sidebar-intro { color:var(--muted); font-size:.8rem; margin:.3rem 0 2rem; }
nav { display:grid; gap:.25rem; }
nav a { color:var(--muted); text-decoration:none; padding:.65rem .7rem; font-size:.88rem; min-height:2.75rem; border-radius:.2rem; }
nav a[aria-current="page"] { background:var(--soft); color:var(--ink); font-weight:600; border-left:.15rem solid var(--ink); padding-left:.55rem; }
nav a:hover { color:var(--ink); background:var(--soft); }
nav a[href="#settings"] { margin-top:1.5rem; }
.sidebar-bottom { margin-top:auto; color:var(--muted); font-size:.75rem; }
main { margin-left:13rem; padding:1.4rem clamp(1.3rem,4vw,4rem); max-width:91rem; }
.topbar { display:flex; align-items:center; flex-wrap:wrap; gap:1rem; border-bottom:1px solid var(--line); padding-bottom:1rem; margin-bottom:2rem; font-size:.78rem; color:var(--muted); }
.topbar > span:first-child { margin-right:auto; }
.topbar button { font-size:.8rem; }
.theme-control { display:flex; align-items:center; gap:.6rem; margin:0; font-size:.78rem; }
.theme-control select { width:auto; padding:.4rem .7rem; min-height:2.75rem; font-size:.8rem; }
h1,h2,h3 { line-height:1.35; letter-spacing:-.02em; font-weight:600; }
h1 { font-size:1.85rem; margin:0 0 .65rem; }
h2 { font-size:1.35rem; margin:.3rem 0 1rem; }
h3 { font-size:1.05rem; }
p { max-width:67ch; }
.lead { color:var(--muted); margin:0 0 1.6rem; }
.page-heading { margin:1.8rem 0 2rem; }
.overview-grid { display:grid; grid-template-columns:minmax(0,1.7fr) minmax(15rem,1fr); gap:3rem; }
.next-practice { padding:0 3rem 0 0; border-right:1px solid var(--line); }
.next-practice h2 { font-size:1.6rem; }
.next-practice > p { color:var(--muted); }
.next-practice pre { margin:1.5rem 0; }
.overview-aside h2 { font-size:1rem; margin-top:0; }
.overview-aside .task-link { border-width:0 0 1px; border-radius:0; padding:1rem 0; margin:0; background:transparent; align-items:start; }
.overview-aside .task-link span { max-width:23ch; font-size:.9rem; }
.overview-aside .task-link small { font-size:.75rem; }
.text-link { display:inline-block; margin-top:1.1rem; font-size:.85rem; }
.next-note { margin-top:2.5rem; }
.resume-line { display:flex; flex-wrap:wrap; gap:.75rem; align-items:center; font-size:.85rem; margin:1.4rem 0; }
.resume-line strong { font-weight:500; color:var(--ink); }
.primary-link { display:inline-flex; align-items:center; gap:2rem; text-decoration:none; }
.today-grid { display:grid; grid-template-columns:minmax(0,1fr) 12rem; gap:2rem; align-items:start; }
.sheet { background:var(--paper); border:1px solid var(--line); padding:clamp(1.2rem,3vw,2rem); border-radius:.25rem; min-width:0; }
.task-label { display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:.5rem; color:var(--muted); font-size:.78rem; margin-bottom:1.2rem; }
.pill { color:var(--muted); background:var(--soft); padding:.2rem .6rem; border-radius:.2rem; font-size:.75rem; }
.energy { border:0; padding:0; margin:0 0 1.5rem; }
.energy legend { font-size:.9rem; margin-bottom:.6rem; }
.energy-options { display:flex; flex-wrap:wrap; gap:.5rem; }
.energy button,.secondary { border:1px solid var(--control); color:var(--ink); background:var(--paper); padding:.55rem .8rem; border-radius:.25rem; min-height:2.75rem; }
.energy button[aria-pressed="true"] { background:var(--soft); border-color:var(--ink); }
.primary { border:1px solid var(--button); border-radius:.25rem; background:var(--button); color:var(--button-ink); padding:.65rem 1.1rem; font-weight:550; min-height:2.75rem; }
.primary:hover { filter:brightness(.93); }
.actions { display:flex; flex-wrap:wrap; gap:.65rem; align-items:center; margin-top:1.1rem; }
.stepper { display:flex; border-bottom:1px solid var(--line); gap:1.4rem; margin-bottom:1.4rem; }
.stepper button { background:none; border:0; border-bottom:.15rem solid transparent; color:var(--muted); padding:.65rem 0; min-height:2.75rem; }
.stepper button[aria-pressed="true"] { color:var(--ink); border-bottom-color:var(--ink); font-weight:600; }
.short-note { font-size:.85rem; color:var(--muted); }
.task-prompt { font-size:1rem; }
pre { white-space:pre-wrap; overflow-wrap:anywhere; padding:1.2rem; background:var(--code); border:1px solid var(--line); border-radius:.2rem; font-size:.9rem; line-height:1.8; }
code { font-family:"SFMono-Regular",Consolas,monospace; }
label { display:block; font-size:.9rem; margin:.9rem 0 .4rem; }
textarea,input,select { width:100%; border:1px solid var(--control); border-radius:.2rem; padding:.65rem; background:var(--paper); color:var(--ink); }
textarea { resize:vertical; min-height:9rem; line-height:1.7; }
.form-row { display:grid; grid-template-columns:7rem 1fr; gap:1rem; }
.side-note { padding:1rem 0; }
.side-note h3 { margin-top:0; }
.side-note p { font-size:.85rem; color:var(--muted); }
.timer { font-variant-numeric:tabular-nums; font-size:2rem; display:block; margin:.7rem 0; }
.side-note .actions { gap:.4rem; }
.side-note button { padding:.4rem .6rem; font-size:.85rem; }
.rule { border-top:1px solid var(--line); margin:1.5rem 0; }
.notice { font-size:.9rem; color:var(--ink); padding:.8rem; border-left:.2rem solid var(--blue); background:var(--soft); }
.notice:empty { display:none; }
footer { color:var(--muted); font-size:.75rem; margin:3rem 0 1rem; border-top:1px solid var(--line); padding-top:1rem; max-width:75ch; }
.phase { border-bottom:1px solid var(--line); padding:1rem 0; }
.phase summary { cursor:pointer; display:flex; gap:1rem; align-items:center; list-style:none; min-height:2.75rem; }
.phase summary::before { content:'+'; font-size:1.3rem; width:1rem; }
.phase[open] summary::before { content:'−'; }
.phase summary strong { flex:1; font-size:1rem; }
.phase summary span { font-size:.8rem; color:var(--muted); }
.phase-body { padding:.4rem 0 .5rem 2rem; }
.task-link { display:flex; width:100%; align-items:center; justify-content:space-between; gap:1rem; background:var(--paper); color:var(--ink); text-align:left; border:1px solid var(--line); border-radius:.2rem; padding:.85rem 1rem; margin:.7rem 0; }
.task-link:hover { color:var(--blue); border-color:var(--control); }
.task-link small { color:var(--blue); white-space:nowrap; }
.callout { background:var(--soft); border-left:.15rem solid var(--control); padding:1rem 1.2rem; font-size:.95rem; margin:1.5rem 0; }
.contribution-list { counter-reset:contribution; padding:0; list-style:none; }
.contribution-list li { display:grid; grid-template-columns:2rem 1fr; gap:1rem; padding:1.2rem 0; border-bottom:1px solid var(--line); }
.contribution-list li::before { counter-increment:contribution; content:counter(contribution); color:var(--muted); }
.contribution-list h3 { margin:0 0 .5rem; }
.contribution-list p { margin:.4rem 0; }
.evidence-entry { padding:1.3rem 0; margin:1rem 0; border-bottom:1px solid var(--line); }
.evidence-entry p { white-space:pre-wrap; overflow-wrap:anywhere; }
.evidence-entry h3 { margin-top:.4rem; }
.stat-line { display:flex; gap:2rem; flex-wrap:wrap; padding:1.3rem 0; }
.stat-line strong { display:block; font-size:1.8rem; font-weight:500; }
.resource-list { padding-left:1.2rem; }
.resource-list li { padding:.3rem 0; }
.skip { position:fixed; left:1rem; top:-5rem; z-index:10; background:var(--paper); padding:.6rem; }
.skip:focus { top:1rem; }
.data-panel { margin-top:1.6rem; }
.check-label { display:flex; align-items:center; gap:.7rem; margin:1.2rem 0; min-height:2.75rem; }
.check-label input { width:1.2rem; height:1.2rem; flex-shrink:0; }
body.focused .sidebar,body.focused .side-note { display:none; }
body.focused main { margin:0 auto; max-width:65rem; }
body.focused .today-grid { grid-template-columns:minmax(0,1fr); }
body.large-text { font-size:1.15rem; line-height:1.85; }
body.large-text textarea,body.large-text input { line-height:1.8; }
body.quiet-timer #timer { visibility:hidden; }
.lab-sheet { max-width:55rem; }
.lab-sheet textarea { min-height:6rem; }
.lab-sheet .code-editor { min-height:14rem; font-family:"SFMono-Regular",Consolas,monospace; font-size:.95rem; tab-size:2; }
.lab-sheet .primary { margin-top:.8rem; }
.lab-sheet .stepper { display:grid; grid-template-columns:repeat(4,1fr); gap:.3rem; }
.lab-sheet .stepper button { font-size:.85rem; }
.table-scroll { overflow-x:auto; }
table { width:100%; border-collapse:collapse; text-align:left; }
caption { text-align:left; color:var(--muted); margin-bottom:.75rem; }
th,td { padding:.7rem; border-bottom:1px solid var(--line); }
.practice-invite { margin-top:-.5rem; margin-bottom:1.5rem; font-size:.85rem; }
#restore-preview .secondary { margin-left:.7rem; }
.cloud-banner { color:var(--muted); font-size:.8rem; padding:0 0 0 .75rem; border-left:.15rem solid var(--control); margin:0 0 1.5rem; max-width:75ch; }
#cloud-panel { margin-top:1rem; }
.back-link { display:inline-block; font-size:.85rem; margin-bottom:1rem; }
.confidence-option { margin:.8rem 0; font-size:.85rem; }
.confidence-option summary { cursor:pointer; min-height:2.75rem; display:flex; gap:.6rem; align-items:center; }
.confidence-option summary::before { content:'+'; }
.confidence-option[open] summary::before { content:'−'; }
.lesson-save-note { border-top:1px solid var(--line); padding-top:1rem; margin-top:1.5rem; color:var(--muted); font-size:.8rem; }
@media(max-width:1100px) { .today-grid { grid-template-columns:1fr; } .side-note { display:grid; grid-template-columns:1fr 1fr; gap:1.5rem; } .side-note .rule { display:none; } .overview-grid { gap:1.8rem; } .next-practice { padding-right:1.8rem; } }
@media(max-width:900px) { .overview-grid { grid-template-columns:1fr; } .next-practice { border:0; padding:0 0 1.5rem; } .overview-aside { border-top:1px solid var(--line); padding-top:1.5rem; } }
@media(max-width:768px) {
  .sidebar { position:static; width:auto; padding:1rem 1.2rem; border-right:0; border-bottom:1px solid var(--line); }
  .sidebar-intro,.sidebar-bottom { display:none; }
  nav { display:flex; overflow-x:auto; gap:.2rem; margin-top:.8rem; padding-bottom:.3rem; }
  nav a { white-space:nowrap; flex-shrink:0; font-size:.82rem; padding:.65rem; }
  nav a[href="#settings"] { margin:0; }
  main { margin:0; padding:1.2rem; }
  .topbar { gap:.6rem; margin-bottom:1.5rem; }
  .topbar > span:first-child,#session-count { display:none; }
  .theme-control { margin-right:auto; }
  .page-heading { margin:1rem 0 1.5rem; }
  h1 { font-size:1.65rem; }
  .phase summary { flex-wrap:wrap; }
  .phase summary strong { flex-basis:65%; }
  .phase summary span { margin-left:2rem; }
  .side-note { grid-template-columns:1fr; }
  .lab-sheet .stepper button { font-size:.75rem; }
  .lab-sheet .actions { align-items:stretch; }
  .lab-sheet .actions button { flex:1 1 100%; margin-top:0; }
  .form-row { grid-template-columns:1fr; }
}
@media(prefers-reduced-motion:reduce) { * { scroll-behavior:auto!important; } }