/* Paperbook: the marked-up paper book.
   Photostat paper, red tape, highlighter under the words, notes in pen. */
@font-face{font-family:"Literata";src:url("/fonts/literata-latin-opsz-normal.woff2") format("woff2");font-weight:200 900;font-style:normal;font-display:swap}
@font-face{font-family:"Literata";src:url("/fonts/literata-latin-opsz-italic.woff2") format("woff2");font-weight:200 900;font-style:italic;font-display:swap}
@font-face{font-family:"Caveat";src:url("/fonts/caveat-latin-500-normal.woff2") format("woff2");font-weight:500;font-display:swap}

:root{
  --page:#fafaf8;       /* photostat paper */
  --sheet:#ffffff;      /* a fresh page */
  --ink:#191b22;        /* printing ink */
  --graphite:#5b5f6d;   /* secondary text */
  --rule:#d9dbe2;       /* feint rule */
  --tape:#a9252b;       /* red tape: flags, links, the one accent */
  --marker:#f6df6b;     /* highlighter, under the words */
  --ivory:#fbf6e7;      /* workspace paper */
  --bezel:#1c1d21;
  --serif:"Literata","Iowan Old Style","Palatino Linotype",Georgia,serif;
  --hand:"Caveat","Bradley Hand","Segoe Print",cursive;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --page:#14161b;--sheet:#1b1e25;--ink:#eceef2;--graphite:#a4a8b4;--rule:#2d313b;
  --tape:#e2646a;--marker:#7d6a1c;--ivory:#262319;--bezel:#000;color-scheme:dark}}
:root[data-theme="dark"]{
  --page:#14161b;--sheet:#1b1e25;--ink:#eceef2;--graphite:#a4a8b4;--rule:#2d313b;
  --tape:#e2646a;--marker:#7d6a1c;--ivory:#262319;--bezel:#000;color-scheme:dark}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--page);color:var(--ink);font:400 1.125rem/1.65 var(--serif);font-optical-sizing:auto;text-rendering:optimizeLegibility}
::selection{background:var(--marker);color:inherit}
a{color:inherit;text-underline-offset:.2em;text-decoration-thickness:1px}
a:focus-visible{outline:2px solid var(--tape);outline-offset:3px;border-radius:2px}
img,svg{max-width:100%;display:block}
h1,h2,h3{font-weight:600;line-height:1.1;margin:0;letter-spacing:-.015em}
p{margin:0}
.wrap{max-width:72rem;margin:0 auto;padding:0 1.25rem}

/* Masthead */
.mast{border-bottom:1px solid var(--rule)}
.mast .wrap{display:flex;align-items:center;gap:.75rem 1.6rem;flex-wrap:wrap;padding-top:1rem;padding-bottom:1rem}
.mast .home{display:flex;align-items:center;gap:.6rem;text-decoration:none;font-weight:620;font-size:1.3rem;letter-spacing:-.01em;margin-right:auto}
.mast .home svg{width:1.55rem;height:1.9rem;flex:none}
.mast nav{display:flex;gap:1.4rem;flex-wrap:wrap;font-size:1.02rem}
.mast nav a{text-decoration:none;color:var(--graphite)}
.mast nav a:hover{color:var(--ink);text-decoration:underline}
.mast nav a[aria-current]{color:var(--ink);text-decoration:underline;text-decoration-color:var(--tape);text-decoration-thickness:2px}

/* Opening */
.open{padding:4.5rem 0 3rem}
.open h1{font-size:clamp(2.6rem,6.6vw,5.4rem);font-weight:450;line-height:1.02;letter-spacing:-.028em;max-width:15ch;text-wrap:balance;font-variation-settings:"opsz" 72}
.open .lead{font-size:1.3rem;line-height:1.55;max-width:38rem;margin-top:1.6rem}
.open .row{display:flex;flex-wrap:wrap;align-items:center;gap:1rem 1.6rem;margin-top:1.8rem}
.stamp{display:inline-block;border:1.5px solid var(--tape);color:var(--tape);padding:.32rem .75rem .26rem;border-radius:3px;font-weight:650;font-size:1rem;letter-spacing:.01em;transform:rotate(-1.4deg)}
.open .quiet{color:var(--graphite);font-size:1rem;max-width:30rem}

/* The device, drawn */
.scene{margin:0 0 5rem}
.device{background:var(--bezel);border-radius:2.1rem;padding:1.05rem;box-shadow:0 1px 0 rgba(255,255,255,.06) inset,0 40px 60px -40px rgba(20,22,30,.55)}
.screen{border-radius:1.15rem;overflow:hidden;background:#f6f6f3}
.screen svg{width:100%;height:auto}
.scene figcaption{margin-top:1rem;color:var(--graphite);font-size:.95rem;font-style:italic}
@media (prefers-reduced-motion:no-preference){
  .scene .ink{stroke-dasharray:1;stroke-dashoffset:1;animation:draw 1.15s cubic-bezier(.45,.1,.25,1) .7s forwards}
  .scene .ink.two{animation-delay:1.9s}
  .scene .knot{opacity:0;animation:show .25s ease-out 1.8s forwards}
  .scene .knot.two{animation-delay:3s}
  @keyframes draw{to{stroke-dashoffset:0}}
  @keyframes show{to{opacity:1}}
}

/* Sections */
.sec{padding:4.25rem 0;border-top:1px solid var(--rule)}
.sec>.wrap>h2{font-size:clamp(2rem,3.8vw,2.85rem);font-weight:470;letter-spacing:-.022em;max-width:24ch;text-wrap:balance}
.sec>.wrap>.intro{color:var(--graphite);max-width:40rem;margin-top:.85rem;font-size:1.15rem}

/* The index of a paper book: what the app does */
.index{width:100%;border-collapse:collapse;margin-top:2.5rem;font-size:1.05rem;line-height:1.5}
.index caption{text-align:left}
.index th,.index td{text-align:left;vertical-align:top;padding:.95rem 1.25rem .9rem 0}
.index thead th{font-weight:650;font-size:.98rem;border-top:3px double var(--ink);border-bottom:1px solid var(--ink);padding-top:.7rem;padding-bottom:.6rem}
.index tbody td{border-bottom:1px solid var(--rule)}
.index tbody tr:last-child td{border-bottom:3px double var(--ink)}
.index .no{width:4.25rem;font-variant-numeric:lining-nums tabular-nums;color:var(--graphite)}
.index .no a{color:var(--tape);text-decoration:underline;text-decoration-color:currentColor;text-decoration-thickness:1px}
.index .pt{width:17rem;font-weight:620}
.index .ds{color:var(--graphite)}
.index tr.part td{border-bottom:1px solid var(--rule);padding-top:1.9rem;padding-bottom:.6rem;font-style:italic;font-size:1.12rem;color:var(--ink)}
.index tr.part:first-child td{padding-top:1.1rem}
.index mark{background:linear-gradient(transparent 12%,var(--marker) 12%,var(--marker) 92%,transparent 92%);color:inherit;padding:0 .1em}

/* Made in practice */
.made{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:2rem 4rem;align-items:start}
.made h2{font-size:clamp(2rem,3.8vw,2.85rem);font-weight:470;letter-spacing:-.022em;text-wrap:balance}
.made p{font-size:1.15rem;max-width:36rem}
.made p+p{margin-top:1rem}
.made .note{font-family:var(--hand);font-size:1.6rem;line-height:1.25;color:var(--tape);transform:rotate(-2deg);margin-top:1.6rem;max-width:22rem}

/* Steps: a real sequence, so they are numbered */
.steps{list-style:none;margin:2.4rem 0 0;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:2rem 2.5rem;counter-reset:s}
.steps li{counter-increment:s;border-top:2px solid var(--ink);padding-top:.9rem}
.steps li:before{content:counter(s);font-size:2.6rem;font-weight:380;line-height:1;display:block;margin-bottom:.55rem;font-variant-numeric:oldstyle-nums}
.steps h3{font-size:1.22rem;font-weight:640}
.steps p{color:var(--graphite);margin-top:.35rem;font-size:1.04rem;line-height:1.5}

/* Private */
.kept{display:grid;grid-template-columns:auto minmax(0,1fr);gap:2.75rem;align-items:center}
.seal{color:var(--tape);border:2px solid var(--tape);outline:1px solid var(--tape);outline-offset:3px;border-radius:4px;padding:.75rem 1.1rem .65rem;font-weight:700;font-size:1.05rem;line-height:1.25;text-align:center;transform:rotate(-5deg);opacity:.92}
.kept p{max-width:44rem;font-size:1.12rem}
.kept p+p{margin-top:.85rem;color:var(--graphite);font-size:1.03rem}

/* Foot */
.foot{border-top:1px solid var(--rule);color:var(--graphite);font-size:.98rem}
.foot .wrap{display:flex;gap:.75rem 1.6rem;flex-wrap:wrap;padding-top:1.7rem;padding-bottom:3rem}
.foot p{flex:1 1 26rem;max-width:46rem}

/* Document pages: privacy, terms, support */
.doc{max-width:47rem;margin:0 auto;padding:1rem 1.25rem 4.5rem}
.doc .sheet{border-left:1px solid var(--tape);box-shadow:-4px 0 0 -3px var(--tape);padding-left:2rem}
.doc h1{font-size:clamp(2.2rem,5vw,3.2rem);font-weight:470;letter-spacing:-.022em;margin:2.25rem 0 .4rem}
.doc h2{font-size:1.38rem;font-weight:640;margin:2.4rem 0 .5rem}
.doc p{margin:.8em 0}
.doc li{margin:.45em 0}
.doc a{color:var(--tape)}
.doc p.updated{color:var(--graphite);font-size:1rem;font-style:italic;margin-top:0}
.doc p.cl{display:grid;grid-template-columns:3em 1fr;margin:.7em 0}
.doc p.cl>span:first-child{font-variant-numeric:lining-nums tabular-nums}
.doc ol.al{counter-reset:a;list-style:none;margin:.4em 0 .9em;padding-left:3em}
.doc ol.al li{counter-increment:a;position:relative;padding-left:2.2em}
.doc ol.al li:before{content:"(" counter(a,lower-alpha) ")";position:absolute;left:0}
.doc p.pre{margin:.9em 0}
.doc dl{margin:1rem 0}
.doc dt{font-weight:640;margin-top:1.4rem}
.doc dd{margin:.3rem 0 0}

@media (max-width:62rem){
  .steps{grid-template-columns:repeat(2,minmax(0,1fr))}
  .made{grid-template-columns:1fr}
  .index .pt{width:13rem}
}
@media (max-width:44rem){
  body{font-size:1.06rem}
  .open{padding:2.75rem 0 2.25rem}
  .open .lead{font-size:1.17rem}
  .scene{margin-bottom:3.5rem}
  .device{border-radius:1.3rem;padding:.6rem}
  .screen{border-radius:.8rem}
  /* On a phone, show the page and the workspace, where the link is drawn */
  .screen svg{width:121.2%;max-width:none;margin-left:-21.2%}
  .sec{padding:3rem 0}
  .index,.index tbody,.index tr,.index td{display:block;width:auto}
  .index thead{display:none}
  .index tr{display:grid;grid-template-columns:2.6rem minmax(0,1fr);border-bottom:1px solid var(--rule);padding:.85rem 0}
  .index tbody tr:last-child{border-bottom:3px double var(--ink)}
  .index tbody td,.index tbody tr:last-child td{border:0;padding:0}
  .index .no{grid-row:1 / span 2;width:auto}
  .index .pt{width:auto}
  .index .ds{grid-column:2;margin-top:.2rem}
  .index tr.part{display:block;padding:1.6rem 0 .5rem;border-bottom:1px solid var(--ink)}
  .index tr.part td{padding:0}
  .index{border-top:3px double var(--ink)}
  .steps{grid-template-columns:1fr}
  .kept{grid-template-columns:1fr;gap:1.75rem;justify-items:start}
  .doc .sheet{border-left:0;box-shadow:none;padding-left:0}
}