/* A Basement, Three Ways
 * A read with three large documents in it. Serif for the prose, monospace
 * for labels. The documents are white sheets in either colour scheme,
 * because they are documents; the page around them follows the reader. */

:root {
  --ink: #1b1b1b;
  --paper: #fdfcf9;
  --muted: #6a6a6a;
  --rule: #e3e0d8;
  --accent: #2a6f97;
  --sheet: #ffffff;
  --sheet-edge: #d9d5ca;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.06), 0 10px 28px rgba(0, 0, 0, 0.09);
  --serif: Georgia, "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", "Times New Roman", serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e4e2dc;
    --paper: #151515;
    --muted: #9a9890;
    --rule: #2c2c2c;
    --accent: #7cc4ea;
    --sheet-edge: #3a3a3a;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.5), 0 12px 32px rgba(0, 0, 0, 0.55);
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.7;
  overflow-x: hidden;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

a:hover {
  text-decoration-style: dotted;
}

.back_link {
  position: absolute;
  top: 1rem;
  left: 1.2rem;
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--muted);
  text-decoration: none;
}

.back_link:hover {
  color: var(--accent);
}

article {
  max-width: 40rem;
  margin: 0 auto;
  padding: 4.5rem 1rem 5rem;
}

/* ---- header ---- */

.kicker {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin: 0 0 1rem;
}

.kicker .made-by {
  display: inline-block;
  padding: 0 0.45em;
  border: 1px dashed currentColor;
  border-radius: 3px;
  color: var(--ink);
  line-height: 1.5;
}

h1 {
  font-weight: normal;
  font-size: 2.3rem;
  line-height: 1.15;
  margin: 0 0 0.8rem;
  letter-spacing: -0.01em;
}

.subtitle {
  font-size: 1.15rem;
  color: var(--muted);
  margin: 0 0 1rem;
  line-height: 1.5;
}

.byline {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0 0 3rem;
  padding-bottom: 1.2rem;
  border-bottom: 1px solid var(--rule);
}

/* ---- prose ---- */

h2 {
  font-weight: normal;
  font-size: 1.65rem;
  line-height: 1.25;
  margin: 3.6rem 0 1.2rem;
}

h2 .part {
  display: block;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

p {
  margin: 0 0 1.15rem;
}

ul,
ol {
  padding-left: 1.4rem;
}

li {
  margin-bottom: 0.6rem;
}

code {
  font-family: var(--mono);
  font-size: 0.86em;
}

/* A callout number, matching the circled numbers on the plan. */
.num {
  display: inline-block;
  min-width: 1.5em;
  height: 1.5em;
  margin: 0 0.15em 0 0.05em;
  border: 1px solid currentColor;
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 0.7em;
  font-style: normal;
  line-height: 1.5em;
  text-align: center;
  vertical-align: 0.2em;
}

/* ---- the three documents ---- */
/* Each is wider than the prose: up to 70rem, or the viewport less a gutter. */

.doc {
  --w: min(100vw - 2rem, 70rem);
  width: var(--w);
  margin: 2.4rem 0 2.6rem calc((100% - var(--w)) / 2);
}

.doc .sheet {
  display: block;
  background: var(--sheet);
  border: 1px solid var(--sheet-edge);
  box-shadow: var(--shadow);
  line-height: 0;
}

.doc .sheet img {
  display: block;
  width: 100%;
  height: auto;
}

/* The photo is portrait: let its height, not the width, decide its size.
 * The sheet shrinks to the image, so the image's limits are set in viewport
 * units rather than percentages, which would have nothing to resolve against. */
.doc.portrait {
  text-align: center;
}

.doc.portrait .sheet {
  display: inline-block;
  width: auto;
  max-width: 100%;
}

.doc.portrait .sheet img {
  width: auto;
  height: auto;
  max-width: calc(100vw - 2rem - 2px);
  max-height: 88vh;
}

.doc.portrait figcaption {
  text-align: left;
}

.doc figcaption {
  max-width: 40rem;
  margin: 0.9rem auto 0;
  padding: 0 0.2rem;
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--muted);
}

.doc figcaption .label {
  display: block;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink);
  margin-bottom: 0.3rem;
}

@media (prefers-color-scheme: dark) {
  .doc .sheet {
    filter: brightness(0.92);
  }
}

/* ---- about ---- */

.about {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  font-size: 0.95rem;
  color: var(--muted);
}

.about h2 {
  font-size: 1.1rem;
  margin: 0 0 0.8rem;
  color: var(--ink);
}

/* ---- phones ---- */

@media (max-width: 600px) {
  article {
    padding-top: 3.8rem;
  }

  h1 {
    font-size: 1.9rem;
  }

  h2 {
    font-size: 1.4rem;
  }

  .doc {
    --w: calc(100vw - 2rem);
  }

  .doc.portrait .sheet img {
    max-height: 80vh;
    max-width: calc(100vw - 2rem - 2px);
  }
}