/* Book Publishing Systems — the public site. One stylesheet, no scripts.
 *
 * The look is a printer's proof: warm paper, one black, a bookcloth green for
 * anything you can press, and an ochre for "not yet". Pictures of the apps sit
 * inside crop marks, the way a page does before it is trimmed. */

:root {
  --paper: #f5f1e8; --band: #ece6d6; --card: #fffdf7;
  --ink: #1a1915; --ink-2: #55524a; --ink-3: #6f6b60; --rule: #d6cfbd;
  --green: #1d5a48; --green-deep: #154536; --on-green: #fffdf7; --green-wash: #dfe9e2;
  --ochre: #8a5a10; --ochre-wash: #f3e3c2; --ochre-line: #c9982f;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --wide: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 17px/1.6 var(--sans); -webkit-font-smoothing: antialiased; }
img { max-width: 100%; height: auto; display: block; }
h1, h2, h3, p, ul, ol, figure { margin: 0; }
a { color: var(--green); text-underline-offset: 3px; }
a:hover { color: var(--green-deep); }
:focus-visible { outline: 3px solid var(--ochre-line); outline-offset: 3px; border-radius: 4px; }
.wrap { max-width: var(--wide); margin: 0 auto; padding: 0 24px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--paper); padding: 8px 14px; border-radius: 8px; z-index: 10; }
.skip:focus { left: 12px; }

.label { font: 600 12px/1.4 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-3); }
.serif { font-family: var(--serif); }

/* --------------------------------------------------------------- draft -- */
.draft { background: var(--ochre-wash); border-bottom: 1px solid var(--ochre-line); color: var(--ink); font-size: 14px; padding: 9px 0; }
.draft b { font-weight: 650; }
.draft summary { cursor: pointer; }
.draft ul { margin: 8px 0 4px; padding-left: 20px; }

/* -------------------------------------------------------------- header -- */
.top { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding-top: 22px; padding-bottom: 22px; }
.brand { display: inline-flex; align-items: center; gap: 11px; color: var(--ink); text-decoration: none; font: 600 19px/1 var(--serif); letter-spacing: 0.005em; }
.brand svg { width: 30px; height: 30px; flex: none; }
.top nav { display: flex; align-items: center; gap: 26px; font-size: 15px; }
.top nav a { color: var(--ink-2); text-decoration: none; }
.top nav a:hover { color: var(--ink); text-decoration: underline; }
.btn { display: inline-block; background: var(--green); color: var(--on-green); text-decoration: none; font: 650 16px/1 var(--sans); padding: 14px 22px; border-radius: 10px; border: 1.5px solid var(--green); }
.btn:hover { background: var(--green-deep); border-color: var(--green-deep); color: var(--on-green); }
.btn.line { background: transparent; color: var(--green); }
.btn.line:hover { background: var(--green-wash); color: var(--green-deep); }
.btn.small { padding: 10px 16px; font-size: 15px; }
.top nav a.btn { color: var(--green); } .top nav a.btn:hover { text-decoration: none; }

/* ---------------------------------------------------------------- hero -- */
.hero { padding-top: 46px; padding-bottom: 30px; }   /* top and bottom only: the sides are .wrap's */
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(280px, 0.9fr); gap: 48px; align-items: end; }
.hero h1 { font: 500 clamp(40px, 5.4vw, 68px)/1.04 var(--serif); letter-spacing: -0.02em; margin-top: 16px; text-wrap: balance; }
.hero .lede { margin-top: 22px; font-size: 19px; line-height: 1.55; color: var(--ink-2); max-width: 36em; }
.hero .cta { margin-top: 30px; display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.hero .fine { margin-top: 14px; font-size: 14.5px; color: var(--ink-3); }

.index { border: 1.5px solid var(--ink); border-radius: 4px; background: var(--card); font-family: var(--mono); font-size: 13px; }
.index-head { display: flex; justify-content: space-between; padding: 9px 14px; border-bottom: 1.5px solid var(--ink); font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; font-size: 11.5px; }
.index a, .index div.row { display: grid; grid-template-columns: 30px 1fr auto; gap: 10px; align-items: baseline; padding: 12px 14px; color: var(--ink); text-decoration: none; }
.index a + a, .index .row { border-top: 1px solid var(--rule); }
.index a:hover { background: var(--green-wash); }
.index .n { color: var(--ink-3); }
.index .what { font: 600 16px/1.3 var(--serif); }
.index .what small { display: block; font: 400 13px/1.4 var(--sans); color: var(--ink-2); margin-top: 2px; }
.index .row .what { color: var(--ink-3); font-weight: 500; }
.state { font: 600 11px/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; padding: 5px 8px; border-radius: 999px; white-space: nowrap; }
.state.live { background: var(--green); color: var(--on-green); }
.state.soon { background: var(--ochre-wash); color: var(--ochre); border: 1px solid var(--ochre-line); }
.state.later { color: var(--ink-3); border: 1px dashed var(--ink-3); }

/* a picture inside crop marks, as a page sits on the sheet before trimming */
.proof { --m: 22px; --t: 16px; position: relative; padding: var(--m); margin: 34px calc(var(--m) * -1) 0;
  background:
    linear-gradient(var(--ink), var(--ink)) left var(--m) top 0 / 1px var(--t) no-repeat,
    linear-gradient(var(--ink), var(--ink)) left 0 top var(--m) / var(--t) 1px no-repeat,
    linear-gradient(var(--ink), var(--ink)) right var(--m) top 0 / 1px var(--t) no-repeat,
    linear-gradient(var(--ink), var(--ink)) right 0 top var(--m) / var(--t) 1px no-repeat,
    linear-gradient(var(--ink), var(--ink)) left var(--m) bottom 0 / 1px var(--t) no-repeat,
    linear-gradient(var(--ink), var(--ink)) left 0 bottom var(--m) / var(--t) 1px no-repeat,
    linear-gradient(var(--ink), var(--ink)) right var(--m) bottom 0 / 1px var(--t) no-repeat,
    linear-gradient(var(--ink), var(--ink)) right 0 bottom var(--m) / var(--t) 1px no-repeat; }
.proof img { width: 100%; border-radius: 3px; box-shadow: 0 1px 0 rgba(26, 25, 21, 0.25), 0 18px 44px -18px rgba(26, 25, 21, 0.45); }
.proof figcaption { position: absolute; left: calc(var(--m) + var(--t) + 8px); bottom: 2px; font: 500 11.5px/1 var(--mono); letter-spacing: 0.06em; color: var(--ink-3); }

/* ------------------------------------------------------------ sections -- */
section { padding: 74px 0; }
section.band { background: var(--band); border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.head { display: grid; gap: 10px; max-width: 46em; margin-bottom: 38px; }
.head h2 { font: 500 clamp(30px, 3.6vw, 44px)/1.1 var(--serif); letter-spacing: -0.015em; text-wrap: balance; }
.head p { color: var(--ink-2); font-size: 18px; }
.mark { display: inline-block; width: 18px; height: 18px; vertical-align: -3px; margin-right: 8px; }

/* -------------------------------------------------------------- systems -- */
.system { display: grid; grid-template-columns: minmax(0, 1fr); gap: 0; background: var(--card); border: 1.5px solid var(--ink); border-radius: 4px; }
.system + .system, .system + .more { margin-top: 34px; }
.sys-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 10px 18px; padding: 18px 26px; border-bottom: 1.5px solid var(--ink); }
.sys-head .n { font: 600 12px/1 var(--mono); letter-spacing: 0.12em; color: var(--ink-3); }
.sys-head h3 { font: 600 28px/1.1 var(--serif); letter-spacing: -0.01em; }
.sys-head .state { margin-left: auto; }
.sys-body { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: 0; }
.sys-say { padding: 28px 26px 30px; border-right: 1px solid var(--rule); }
.sys-say .tagline { font: 500 25px/1.25 var(--serif); letter-spacing: -0.01em; text-wrap: balance; }   /* not "line": that is the outlined button */
.sys-say .body { margin-top: 14px; color: var(--ink-2); }
.sys-say .btn { margin-top: 24px; }
.sys-note { margin-top: 20px; padding: 12px 14px; background: var(--ochre-wash); border-left: 3px solid var(--ochre-line); font-size: 15px; color: var(--ink); border-radius: 0 6px 6px 0; }
.points { list-style: none; padding: 12px 26px 16px; display: grid; gap: 0; }
.points li { padding: 14px 0 14px 30px; position: relative; border-bottom: 1px solid var(--rule); }
.points li:last-child { border-bottom: 0; }
.points li::before { content: ""; position: absolute; left: 2px; top: 21px; width: 13px; height: 7px; border-left: 2.5px solid var(--green); border-bottom: 2.5px solid var(--green); transform: rotate(-45deg); }
.points b { display: block; font-weight: 650; }
.points span { color: var(--ink-2); font-size: 16px; }
.sys-shot { border-top: 1.5px solid var(--ink); padding: 26px 26px 34px; background: var(--paper); }
.sys-shot .proof { margin: 0; }

/* chapter by chapter: what "saved as it goes" looks like */
.chapters { margin-top: 26px; }
.chapters ol { list-style: none; padding: 0; display: flex; gap: 6px; }
.chapters li { flex: 1; min-width: 0; height: 46px; border-radius: 4px; display: grid; place-items: center; font: 600 11px/1 var(--mono); letter-spacing: 0.04em; }
.chapters li.done { background: var(--green); color: var(--on-green); }
.chapters li.now { background: var(--ochre-wash); color: var(--ochre); border: 1.5px solid var(--ochre-line); animation: writing 1.6s ease-in-out infinite; }
.chapters li.next { border: 1.5px dashed var(--ink-3); color: var(--ink-3); }
.chapters p { margin-top: 10px; font-size: 14px; color: var(--ink-3); }
.chapters .key { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin: 0 5px 0 12px; vertical-align: -1px; }
.chapters .key:first-child { margin-left: 0; }
.chapters .key.done { background: var(--green); } .chapters .key.now { background: var(--ochre-wash); border: 1.5px solid var(--ochre-line); } .chapters .key.next { border: 1.5px dashed var(--ink-3); }
@keyframes writing { 50% { background: #fff6df; } }
@media (prefers-reduced-motion: reduce) { .chapters li.now { animation: none; } html { scroll-behavior: auto; } }

/* the files a finished book downloads as */
.outs { margin-top: 22px; }
.outs ul { list-style: none; padding: 0; margin-top: 8px; display: flex; gap: 10px; }
.outs li { flex: 1; background: var(--paper); border: 1.5px solid var(--ink); border-radius: 3px 14px 3px 3px; padding: 12px 12px 10px; font-size: 13.5px; color: var(--ink-2); position: relative; }
.outs li::after { content: ""; position: absolute; right: -1.5px; top: -1.5px; width: 14px; height: 14px; background: linear-gradient(225deg, var(--card) 50%, var(--ink) 50%, var(--ink) calc(50% + 1.5px), var(--paper) calc(50% + 1.5px)); border-radius: 0 0 0 3px; }
.outs b { display: block; font: 600 17px/1.2 var(--mono); color: var(--ink); }

/* how many kinds of puzzle, for whom */
.kinds { margin-top: 26px; }
.kinds svg { display: block; }
.kinds rect.k1 { fill: var(--ink); } .kinds rect.k2 { fill: #3c3a33; } .kinds rect.k3 { fill: #6a665b; }
.kinds rect.k4 { fill: var(--green); } .kinds rect.k5 { fill: #5f927f; }
.kinds ul { list-style: none; padding: 0; margin-top: 10px; display: flex; flex-wrap: wrap; gap: 4px 18px; font-size: 14px; color: var(--ink-2); }
.kinds li b { font: 600 14px/1 var(--mono); color: var(--ink); margin-right: 5px; }
.kinds li::before { content: ""; display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 6px; background: var(--ink); vertical-align: -1px; }
.kinds li:nth-child(2)::before { background: #3c3a33; } .kinds li:nth-child(3)::before { background: #6a665b; }
.kinds li:nth-child(4)::before { background: var(--green); } .kinds li:nth-child(5)::before { background: #5f927f; }

.more { border: 1.5px dashed var(--ink-3); border-radius: 4px; padding: 24px 26px; display: grid; grid-template-columns: auto 1fr; gap: 6px 18px; align-items: baseline; }
.more .n { font: 600 12px/1 var(--mono); letter-spacing: 0.12em; color: var(--ink-3); }
.more h3 { font: 600 22px/1.2 var(--serif); }
.more p { grid-column: 2; color: var(--ink-2); max-width: 44em; }

/* ---------------------------------------------------------------- steps -- */
.steps { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; border: 1.5px solid var(--ink); border-radius: 4px; background: var(--card); }
.steps li { padding: 26px 24px 28px; position: relative; }
.steps li + li { border-left: 1px solid var(--rule); }
.steps svg { width: 42px; height: 42px; color: var(--green); }
.steps .n { position: absolute; right: 20px; top: 20px; font: 500 44px/1 var(--serif); color: var(--rule); }
.steps h3 { font: 600 21px/1.2 var(--serif); margin-top: 14px; }
.steps p { margin-top: 8px; color: var(--ink-2); font-size: 16px; }
.needs { margin-top: 34px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.need { border-top: 3px solid var(--ink); padding-top: 14px; }
.need h3 { font: 600 20px/1.25 var(--serif); }
.need p { margin-top: 6px; color: var(--ink-2); font-size: 16px; }

/* ---------------------------------------------------------------- facts -- */
.facts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; border-top: 1.5px solid var(--ink); border-left: 1px solid var(--rule); }
.fact { padding: 24px 22px 26px; border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.fact h3 { font: 600 20px/1.25 var(--serif); display: flex; gap: 8px; align-items: flex-start; }
.fact h3 svg { width: 17px; height: 17px; flex: none; margin-top: 4px; color: var(--green); }
.fact p { margin-top: 8px; color: var(--ink-2); font-size: 16px; }

/* ------------------------------------------------------------ questions -- */
.qa { border-top: 1.5px solid var(--ink); max-width: 820px; }
.qa details { border-bottom: 1px solid var(--rule); }
.qa summary { cursor: pointer; list-style: none; padding: 18px 40px 18px 0; position: relative; font: 600 20px/1.3 var(--serif); }
.qa summary::-webkit-details-marker { display: none; }
.qa summary::after { content: "+"; position: absolute; right: 6px; top: 14px; font: 400 26px/1 var(--mono); color: var(--green); }
.qa details[open] summary::after { content: "\2212"; }
.qa p { padding: 0 40px 20px 0; color: var(--ink-2); }

/* ---------------------------------------------------------------- close -- */
.close { text-align: center; padding: 84px 0; }
.close h2 { font: 500 clamp(30px, 4vw, 46px)/1.1 var(--serif); letter-spacing: -0.015em; text-wrap: balance; }
.close p { margin: 14px auto 0; color: var(--ink-2); max-width: 34em; }
.close .cta { margin-top: 26px; display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
footer { border-top: 1.5px solid var(--ink); padding: 30px 0 46px; font-size: 14px; color: var(--ink-3); }
footer .row { display: flex; flex-wrap: wrap; gap: 12px 28px; align-items: center; justify-content: space-between; }
footer .legal { margin-top: 16px; max-width: 70em; line-height: 1.55; }
footer a { color: var(--ink-2); }

/* --------------------------------------------------------------- narrow -- */
@media (max-width: 900px) {
  body { font-size: 16.5px; }
  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 30px; }
  .sys-body { grid-template-columns: minmax(0, 1fr); }
  .sys-say { border-right: 0; border-bottom: 1px solid var(--rule); }
  .steps { grid-template-columns: minmax(0, 1fr); }
  .steps li + li { border-left: 0; border-top: 1px solid var(--rule); }
  .facts { grid-template-columns: minmax(0, 1fr); }
  .needs { grid-template-columns: minmax(0, 1fr); }
  section { padding: 54px 0; }
  .top nav a:not(.btn) { display: none; }
  .proof { --m: 14px; --t: 10px; margin-left: 0; margin-right: 0; }
  .proof figcaption { display: none; }
  .sys-head, .sys-say, .points, .sys-shot { padding-left: 18px; padding-right: 18px; }
  .more { grid-template-columns: minmax(0, 1fr); } .more p { grid-column: 1; }
}
@media (max-width: 520px) {
  .chapters li { font-size: 0; }   /* the tiles stay; their tiny words would not fit */
  .brand { font-size: 17px; }
}

/* ------------------------------------------------------ the pages inside -- */
.top nav a[aria-current="page"] { color: var(--ink); font-weight: 650; text-decoration: underline; text-decoration-color: var(--green); text-decoration-thickness: 2px; text-underline-offset: 6px; }
.page-hero { padding: 40px 24px 6px; }
.page-hero .label { display: flex; align-items: center; gap: 10px; }
.page-hero h1 { font: 500 clamp(40px, 5.6vw, 72px)/1.03 var(--serif); letter-spacing: -0.02em; margin-top: 14px; text-wrap: balance; }
.page-hero .lede { margin-top: 18px; font-size: 19px; line-height: 1.55; color: var(--ink-2); max-width: 40em; }
.page-hero .cta { margin-top: 26px; display: flex; flex-wrap: wrap; gap: 12px; }
.page-hero .sys-note { max-width: 40em; }
section.tight { padding-top: 40px; }
.morelink { margin-top: 22px; font-weight: 650; }
.morelink a { text-decoration: none; border-bottom: 2px solid var(--green); padding-bottom: 2px; }
.sys-cta { margin-top: 24px; display: flex; flex-wrap: wrap; gap: 10px; }
.sys-say .sys-cta .btn { margin-top: 0; }
.card { background: var(--card); border: 1.5px solid var(--ink); border-radius: 4px; }
.card .points { grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 40px; padding-top: 8px; padding-bottom: 8px; }
.card .points li:nth-last-child(2):nth-child(odd) { border-bottom: 0; }
.card.spaced { margin-top: 28px; }
.two { margin-top: 30px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 40px; align-items: start; }
.two .chapters, .two .outs { margin-top: 0; }

/* numbered parts in a row: an app's own steps */
.flow { list-style: none; padding: 0; display: grid; gap: 0; border: 1.5px solid var(--ink); border-radius: 4px; background: var(--card); }
.flow.n4 { grid-template-columns: repeat(4, minmax(0, 1fr)); } .flow.n5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.flow li { padding: 22px 20px 24px; }
.flow li + li { border-left: 1px solid var(--rule); }
.flow .n { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; border: 1.5px solid var(--green); color: var(--green); font: 600 16px/1 var(--serif); }
.flow h3 { font: 600 20px/1.2 var(--serif); margin-top: 14px; }
.flow p { margin-top: 6px; color: var(--ink-2); font-size: 15.5px; }

/* real pages, side by side, as sheets of paper */
.sheets { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 26px; }
.sheets img { width: 100%; background: #fff; border: 1px solid var(--rule); box-shadow: 0 1px 0 rgba(26, 25, 21, 0.2), 0 14px 30px -16px rgba(26, 25, 21, 0.5); }
.sheets figcaption { margin-top: 10px; font: 600 12px/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); }

h3.who { font: 600 24px/1.2 var(--serif); margin: 34px 0 14px; padding-top: 16px; border-top: 1.5px solid var(--ink); }
.kindlist { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 24px 30px; }
.kindlist ul { list-style: none; padding: 0; margin-top: 8px; font-size: 15.5px; color: var(--ink-2); }
.kindlist li { padding: 3px 0; border-bottom: 1px dotted var(--rule); }
.aside { margin-top: 22px; color: var(--ink-2); max-width: 46em; }
.getone { margin-top: 40px; padding: 26px; background: var(--card); border: 1.5px solid var(--ink); border-radius: 4px; max-width: 640px; }
.getone h2 { font: 600 26px/1.2 var(--serif); }
.getone p { margin-top: 10px; color: var(--ink-2); }
.plainlist { list-style: none; padding: 0; border-top: 1.5px solid var(--ink); max-width: 820px; }
.plainlist li { padding: 16px 0 16px 34px; border-bottom: 1px solid var(--rule); position: relative; font-size: 18px; }
.plainlist li::before { content: "\00d7"; position: absolute; left: 4px; top: 12px; font: 400 24px/1 var(--mono); color: var(--ochre); }
h2.qgroup { font: 600 13px/1.4 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-3); margin: 34px 0 10px; }
h2.qgroup:first-child { margin-top: 0; }
footer nav { display: flex; flex-wrap: wrap; gap: 6px 20px; }
footer nav a { text-decoration: none; } footer nav a:hover { text-decoration: underline; }

@media (max-width: 900px) {
  .flow.n4, .flow.n5 { grid-template-columns: minmax(0, 1fr); }
  .flow li + li { border-left: 0; border-top: 1px solid var(--rule); }
  .flow li { display: grid; grid-template-columns: 34px 1fr; column-gap: 14px; padding: 16px 18px; }
  .flow h3 { margin-top: 4px; } .flow p { grid-column: 2; }
  .card .points { grid-template-columns: minmax(0, 1fr); }
  .card .points li:nth-last-child(2):nth-child(odd) { border-bottom: 1px solid var(--rule); }
  .two { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .sheets { grid-template-columns: minmax(0, 1fr); max-width: 420px; }
  .page-hero { padding-top: 26px; }
  .top { flex-wrap: wrap; row-gap: 12px; }
}