/* Class Ping -- the same look as the desktop app.
   Study Lamp (warm dark) by default; Parchment (cream paper) when the
   visitor's device is set to light. Flat: hairlines, one accent, no shine. */

:root {
  --sidebar: #1B1A18;
  --bg: #242320;
  --card: #2D2B28;
  --raised: #383632;
  --divider: #45423C;
  --accent: #D97757;
  --accent-hover: #E48A6B;
  --accent-text: #1F1E1C;
  --text: #EDE9E0;
  --muted: #B0AA9E;
  --faint: #8A8479;
  --due: #E2A45F;
  --ok: #9DBB8F;
  --link: #8AB4F8;
  --assignment: #9DB0D0;
  --material: #A7BE92;
  --announcement: #C2A6CC;

  --serif: Georgia, "Times New Roman", serif;
  --ui: "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;
  --brand: "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --radius: 8px;
  --wide: 1080px;
  --read: 720px;
  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root {
    --sidebar: #EFE8DA;
    --bg: #F7F2E8;
    --card: #FFFDF8;
    --raised: #EAE2D3;
    --divider: #D6CAB4;
    --accent: #9E2B35;
    --accent-hover: #B23A44;
    --accent-text: #FFF8F0;
    --text: #2B2620;
    --muted: #6B6256;
    --faint: #8C8274;
    --due: #8F5410;
    --ok: #46703F;
    --link: #1F5FAF;
    --assignment: #3E5F8A;
    --material: #4F7A45;
    --announcement: #6E4A86;
    color-scheme: light;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 var(--ui);
}

a { color: var(--link); text-underline-offset: 3px; }
a:hover { color: var(--text); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.wrap { max-width: var(--wide); margin: 0 auto; padding: 0 32px; }
.read .page-head, .read .doc { max-width: var(--read); }

/* -- top bar: one row, everything on one centre line -- */
.top {
  background: var(--sidebar);
  border-bottom: 1px solid var(--divider);
}
.top .wrap {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font: bold 20px/1 var(--brand);
  white-space: nowrap;
}
.brand img { width: 30px; height: 30px; border-radius: 7px; display: block; }
.top nav { display: flex; align-items: center; gap: 4px; }
.top nav a {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 14px;
  border-radius: var(--radius);
  color: var(--muted);
  text-decoration: none;
  font-size: 15px;
  line-height: 1;
}
.top nav a:hover { color: var(--text); background: var(--raised); }
.top nav a[aria-current="page"] { color: var(--text); background: var(--raised); font-weight: 600; }

/* -- type -- */
h1, h2, h3 { font-family: var(--serif); font-weight: normal; line-height: 1.2; margin: 0; }
h1 { font-size: 50px; letter-spacing: -0.01em; }
h2 { font-size: 30px; }
h3 { font-size: 19px; font-weight: bold; }
p { margin: 0 0 14px; }
ul { margin: 0 0 14px; padding-left: 22px; }
li { margin-bottom: 6px; }
strong { font-weight: 600; }

.eyebrow, .label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--faint);
}
.eyebrow { display: block; margin-bottom: 16px; color: var(--accent); }

/* -- the opening of the home page -- */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 64px;
  align-items: center;
  padding-top: 96px;
  padding-bottom: 88px;
}
.hero h1 { margin-bottom: 20px; }
.lead { font-size: 19px; line-height: 1.6; color: var(--muted); margin-bottom: 28px; max-width: 520px; }

.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 18px; }
.button {
  display: inline-flex;
  align-items: center;
  height: 44px;
  padding: 0 20px;
  border-radius: var(--radius);
  background: var(--accent);
  color: var(--accent-text);
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
}
.button:hover { background: var(--accent-hover); color: var(--accent-text); }
.button.soon { cursor: default; }
.button.soon:hover { background: var(--accent); }
.button.quiet { background: transparent; color: var(--text); border: 1px solid var(--divider); }
.button.quiet:hover { background: var(--raised); }

.facts { display: flex; flex-wrap: wrap; gap: 6px 18px; padding: 0; margin: 0 0 6px; list-style: none; }
.facts li { margin: 0; font-size: 14px; color: var(--muted); }
.facts li::before { content: "\2713"; color: var(--ok); margin-right: 7px; }
.note { font-size: 13px; color: var(--faint); margin: 0; }

/* the app, drawn small: a sidebar edge and two posts */
.preview {
  background: var(--sidebar);
  border: 1px solid var(--divider);
  border-radius: 12px;
  padding: 18px;
}
.preview-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 2px 4px 14px;
}
.preview-head span:first-child { font: 20px var(--serif); color: var(--text); }
.preview-head span:last-child { font-size: 13px; color: var(--faint); }
.post {
  background: var(--card);
  border: 1px solid var(--divider);
  border-radius: var(--radius);
  padding: 14px 16px;
}
.post + .post { margin-top: 8px; }
.post.unread { border-left: 3px solid var(--accent); }
.post .kind { font-size: 11px; font-weight: 600; letter-spacing: 0.09em; text-transform: uppercase; }
.post .kind.assignment { color: var(--assignment); }
.post .kind.announcement { color: var(--announcement); }
.post .title { font: bold 17px/1.3 var(--serif); margin: 4px 0 4px; color: var(--text); }
.post .meta { font-size: 13px; color: var(--faint); }
.post .meta .due { color: var(--due); }
.post.done .title { color: var(--faint); text-decoration: line-through; text-decoration-color: var(--divider); }
.todo {
  margin-top: 10px;
  background: var(--raised);
  border-radius: 6px;
  padding: 9px 12px;
  font-size: 14px;
  line-height: 1.5;
}
.todo .label { margin-right: 8px; color: var(--muted); font-size: 11px; }

/* -- sections: heading on the left, words on the right -- */
.band { border-top: 1px solid var(--divider); padding: 72px 0; }
.band.alt { background: var(--sidebar); }
.split { display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(0, 2fr); gap: 56px; }
.split h2 { position: relative; }
.split .body { max-width: var(--read); }
.split .body > p:last-child { margin-bottom: 0; }
.section-head { margin-bottom: 36px; max-width: var(--read); }
.section-head p { color: var(--muted); margin: 12px 0 0; font-size: 17px; }

.features { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 36px 40px; }
.feature h3 { font-size: 18px; margin-bottom: 8px; }
.feature p { color: var(--muted); margin: 0; font-size: 15px; }
.feature::before {
  content: "";
  display: block;
  width: 28px;
  height: 2px;
  background: var(--accent);
  margin-bottom: 14px;
}

.sections { display: flex; flex-wrap: wrap; gap: 6px; padding: 0; list-style: none; margin: 0 0 12px; }
.sections li {
  margin: 0;
  font-size: 14px;
  padding: 5px 12px;
  border-radius: var(--radius);
  background: var(--raised);
}

.uses { width: 100%; border-collapse: collapse; margin: 4px 0 20px; font-size: 15px; }
.uses th, .uses td { text-align: left; vertical-align: top; padding: 14px 0; border-top: 1px solid var(--divider); }
.uses tr:first-child th, .uses tr:first-child td { border-top: 0; padding-top: 0; }
.uses th { font-weight: 600; width: 36%; padding-right: 24px; }
.uses td { color: var(--muted); }

/* -- privacy page -- */
.page-head { padding: 72px 0 28px; }
.page-head h1 { font-size: 44px; margin-bottom: 10px; }
.updated { color: var(--faint); font-size: 14px; margin: 0; }
.doc { padding-bottom: 72px; }
.doc h2 { font-size: 26px; margin: 52px 0 14px; padding-top: 4px; scroll-margin-top: 16px; }
.doc h3 { font-size: 17px; margin: 22px 0 6px; }
.summary {
  background: var(--card);
  border: 1px solid var(--divider);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 18px 22px 10px;
  margin: 32px 0 8px;
}
.summary .label { display: block; margin-bottom: 8px; }
.toc { columns: 2; column-gap: 32px; padding-left: 20px; font-size: 15px; margin: 0; }
.toc li { break-inside: avoid; }
.table-wrap { overflow-x: auto; }
.doc table { width: 100%; border-collapse: collapse; margin: 8px 0 18px; font-size: 15px; }
.doc th, .doc td { text-align: left; vertical-align: top; padding: 12px 0; border-top: 1px solid var(--divider); }
.doc th { font-weight: 600; color: var(--text); width: 30%; padding-right: 20px; }
.doc td { color: var(--muted); }
code { font-family: Consolas, "Courier New", monospace; font-size: 14px; background: var(--raised); padding: 1px 6px; border-radius: 4px; }

/* -- foot -- */
footer { border-top: 1px solid var(--divider); background: var(--sidebar); color: var(--faint); font-size: 14px; }
footer .wrap { padding-top: 28px; padding-bottom: 32px; display: flex; justify-content: space-between; gap: 32px; }
footer p { margin: 0 0 6px; max-width: 560px; }
footer a { color: var(--muted); }
.foot-links { display: flex; gap: 18px; white-space: nowrap; }

/* -- narrower screens -- */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 48px; padding-top: 64px; padding-bottom: 64px; }
  .features { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .split { grid-template-columns: 1fr; gap: 18px; }
}

@media (max-width: 640px) {
  .wrap { padding: 0 16px; }
  .top .wrap { height: 56px; }
  .brand { font-size: 18px; gap: 8px; }
  .brand img { width: 26px; height: 26px; }
  .top nav { gap: 0; }
  .top nav a { padding: 0 9px; font-size: 14px; height: 32px; }
  h1 { font-size: 36px; }
  h2 { font-size: 25px; }
  .hero { padding-top: 44px; padding-bottom: 48px; gap: 36px; }
  .lead { font-size: 17px; }
  .band { padding: 52px 0; }
  .features { grid-template-columns: 1fr; gap: 28px; }
  .preview { padding: 12px; }
  .uses th { width: 42%; }
  .page-head { padding-top: 44px; }
  .page-head h1 { font-size: 34px; }
  .toc { columns: 1; }
  footer .wrap { flex-direction: column; gap: 12px; }
}