/* The marketing site for k0-board.com. One stylesheet for every page; the colours live on :root so
   the dark scheme only has to say which ones change. */

:root {
  color-scheme: light dark;
  --paper: #f3f1ea;
  --card: #fffdf7;
  --line: #ddd8cb;
  --ink: #2b2b2b;
  --ink-strong: #000;
  --body: #4a4740;
  --muted: #6b665a;
  --hand: #7d7869;
  --on-ink: #fffdf7;
  --panel: #2b2b2b;
  --panel-text: #fffdf7;
  --panel-soft: #e8e4d8;
  --panel-line: #5a564c;
  --panel-error: #fbb4b4;
  --shadow: rgba(0, 0, 0, .12);

  /* The notes are paper whatever the screen is doing, so their ink never changes either. */
  --note-ink: #2b2b2b;
  --red: #fbb4b4;
  --orange: #fdd0a2;
  --blue: #a9c9f5;
  --green: #b7e8c4;
  --yellow: #fde68a;
  --yellow-line: #e3c65a;

  --hand-font: 'Caveat', cursive;
  --sans: 'Instrument Sans', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
  --wide: 1240px;
  --gutter: 24px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #1b1a17;
    --card: #25231f;
    --line: #3b3830;
    --ink: #ece8dc;
    --ink-strong: #fff;
    --body: #c9c4b6;
    --muted: #9d9789;
    --hand: #a9a393;
    --on-ink: #1b1a17;
    --panel: #2c2a25;
    --panel-text: #fffdf7;
    --panel-soft: #d6d1c3;
    --panel-line: #4a463d;
    --shadow: rgba(0, 0, 0, .45);
    /* A little less glare from the notes on a dark page, still light enough for their dark ink. */
    --red: #f2a5a5;
    --orange: #f3c290;
    --blue: #9dbde9;
    --green: #a8dbb5;
    --yellow: #f4dc7c;
    --yellow-line: #c9ab45;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  overflow-wrap: break-word;
}

a { color: var(--ink); }
a:hover { color: var(--ink-strong); }

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

.wrap {
  max-width: var(--wide);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: 16px;
  top: 16px;
  z-index: 10;
  background: var(--card);
  padding: 8px 12px;
  border-radius: 8px;
}

:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 2px;
}

/* Header */

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 24px;
  padding-top: 22px;
  padding-bottom: 22px;
}

.logo {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 26px;
  text-decoration: none;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  font-size: 16px;
  flex: 1 1 auto;
}
.site-nav a { text-decoration: none; }

.btn {
  display: inline-block;
  background: var(--ink);
  color: var(--on-ink);
  text-decoration: none;
  padding: 12px 20px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  text-align: center;
}
.btn:hover { color: var(--on-ink); opacity: .9; }
.btn-big { padding: 16px 26px; font-size: 17px; }
.btn-outline {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--ink);
}
.btn-outline:hover { color: var(--ink); opacity: 1; background: var(--paper); }

/* Hero */

.hero {
  display: flex;
  flex-wrap: wrap;
  gap: 48px;
  align-items: center;
  padding-top: 56px;
  padding-bottom: 40px;
}

.hero-copy {
  flex: 1 1 460px;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.hero-copy p { margin: 0; }

.kicker {
  font-family: var(--hand-font);
  font-size: 30px;
  color: var(--hand);
}

h1 {
  margin: 0;
  font-size: clamp(40px, 7vw, 64px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  font-weight: 700;
}

.lede {
  font-size: 20px;
  line-height: 1.55;
  color: var(--body);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.pill-code {
  font-size: 15px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 15px 20px;
}

.small { font-size: 14px; color: var(--muted); }

.notes {
  flex: 1 1 520px;
  min-width: 0;
  position: relative;
  height: 470px;
}

.note {
  position: absolute;
  padding: 18px;
  border-radius: 4px;
  box-shadow: 0 12px 24px var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 10px;
  color: var(--note-ink);
}
.note-key { font-family: var(--mono); font-size: 13px; font-weight: 600; }
.note-title { font-family: var(--hand-font); font-size: 30px; line-height: 1.05; }
.note-status { font-size: 13px; }

.note-red { left: 4%; top: 10px; width: 46%; transform: rotate(-3deg); background: var(--red); }
.note-orange { right: 4%; top: 40px; width: 44%; transform: rotate(2.5deg); background: var(--orange); }
.note-blue { left: 10%; top: 200px; width: 42%; transform: rotate(1.5deg); background: var(--blue); }
.note-green { right: 8%; top: 250px; width: 40%; transform: rotate(-2deg); background: var(--green); }

/* Sections */

.section { padding-top: 64px; padding-bottom: 64px; }
.section-tight { padding-top: 48px; padding-bottom: 48px; }

h2 {
  margin: 0 0 8px;
  font-family: var(--hand-font);
  font-size: 52px;
  font-weight: 700;
  line-height: 1.1;
}

.intro {
  margin: 0 0 36px;
  font-size: 19px;
  color: var(--body);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(300px, 100%), 1fr));
  gap: 20px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.card h3 { margin: 0; font-size: 21px; }
.card p { margin: 0; font-size: 16px; line-height: 1.55; color: var(--body); }

.steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
  gap: 20px;
}
.steps li {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-top: 2px solid var(--ink);
  padding-top: 16px;
}
.step-num { font-family: var(--mono); font-size: 14px; color: var(--muted); }
.steps strong { font-size: 20px; }
.step-text { font-size: 16px; line-height: 1.5; color: var(--body); }

/* Pricing */

.plan {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.plan h3 { margin: 0; font-size: 22px; }
.plan p { margin: 0; }
.price { font-size: 44px; font-weight: 700; line-height: 1.1; }
.price span { font-size: 18px; font-weight: 500; }
.small-note { font-size: 14px; }
.plan ul { margin: 0; padding-left: 18px; font-size: 16px; line-height: 1.8; color: var(--body); }
.plan .btn { margin-top: auto; padding: 13px; font-size: 16px; }

/* The featured plan is a sticky note too, so it keeps dark ink in both schemes. */
.plan-featured {
  background: var(--yellow);
  border-color: var(--yellow-line);
  box-shadow: 0 14px 30px var(--shadow);
  color: var(--note-ink);
}
.plan-featured ul { color: var(--note-ink); }
.plan-featured .btn, .plan-featured .btn:hover { background: var(--note-ink); color: #fffdf7; }

.coming {
  font-family: var(--mono);
  font-size: 12px;
  padding: 1px 7px;
  border-radius: 999px;
  border: 1px solid currentColor;
  white-space: nowrap;
}

/* Early access */

.access {
  background: var(--panel);
  color: var(--panel-text);
  border-radius: 22px;
  padding: 44px;
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  align-items: flex-end;
}
.access h2 { margin: 0; }
.access-copy {
  flex: 1 1 380px;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.access-copy p { margin: 0; font-size: 18px; line-height: 1.5; color: var(--panel-soft); }

.access-form {
  flex: 1 1 420px;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.access-form label { font-size: 14px; color: var(--panel-soft); }
.access-form input {
  font: inherit;
  font-size: 17px;
  padding: 15px 18px;
  border-radius: 12px;
  border: 1px solid var(--panel-line);
  background: #fffdf7;
  color: #2b2b2b;
  width: 100%;
}
.access-form input[aria-invalid='true'] { border-color: var(--panel-error); box-shadow: 0 0 0 2px var(--panel-error); }
.access-form button {
  font: inherit;
  font-weight: 600;
  font-size: 17px;
  padding: 16px;
  border-radius: 999px;
  border: 0;
  background: var(--yellow);
  color: var(--note-ink);
  cursor: pointer;
}
.access-form button:disabled { opacity: .6; cursor: progress; }
.form-error { margin: 0; font-size: 15px; color: var(--panel-error); }
.form-error:empty { display: none; }

.thanks {
  flex: 1 1 420px;
  min-width: 0;
  margin: 0;
  font-family: var(--hand-font);
  font-size: 32px;
  line-height: 1.2;
  color: var(--yellow);
}

/* Footer */

.site-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  justify-content: space-between;
  font-size: 14px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding-top: 28px;
  padding-bottom: 48px;
}
.footer-links { display: flex; flex-wrap: wrap; gap: 18px; }

/* Privacy, terms, 404 */

.doc { padding-top: 32px; padding-bottom: 72px; }
.doc h1 { font-size: clamp(36px, 6vw, 52px); margin-bottom: 8px; }
.doc h2 { font-size: 38px; margin: 40px 0 8px; }
.doc p, .doc li { font-size: 17px; line-height: 1.65; color: var(--body); }
.doc ul { padding-left: 22px; }
.doc .small { margin-top: 0; }

.lost {
  padding-top: 64px;
  padding-bottom: 96px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 24px;
}
.lost .note {
  position: static;
  transform: rotate(-2deg);
  background: var(--red);
  width: min(340px, 100%);
}
.lost p { margin: 0; font-size: 19px; color: var(--body); }

/* Phones */

@media (max-width: 640px) {
  :root { --gutter: 16px; }
  h2 { font-size: 42px; }
  .lede { font-size: 18px; }
  .hero { padding-top: 32px; gap: 32px; }
  .section { padding-top: 44px; padding-bottom: 44px; }
  .access { padding: 28px 20px; }
  /* Four notes placed by hand overlap their own words on a phone, so they settle into two
     columns, still a little crooked. */
  .notes {
    height: auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    padding: 6px;
  }
  .note { position: static; width: auto; padding: 14px; }
  .note-title { font-size: 24px; }
}