/* Koyomi home page. Colours are Kitae's own colour sets; fonts are Kitae's fonts. */

@font-face {
  font-family: "Darker Grotesque";
  src: url("fonts/DarkerGrotesque-SemiBold.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Darker Grotesque";
  src: url("fonts/DarkerGrotesque-Bold.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Space Mono";
  src: url("fonts/SpaceMono-Regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

:root {
  color-scheme: light dark;

  --paper: #FDF9F0;
  --ink: #1C1C16;
  --ink-soft: #5E5C4E;
  --rule: #1C1C16;
  --olive: #63611E;
  --olive-soft: #F7F3A1;
  --on-olive-soft: #545210;

  /* The Kitae band */
  --band-bg: #63611E;
  --band-fg: #FFFFFF;
  --band-on: #F7F3A1;
  --band-off: rgba(255, 255, 255, 0.16);

  /* The cairn */
  --stone-a: #63611E;
  --stone-b: #F7F3A1;
  --heart: #70576B;
  --gap: #FDF9F0;
  --hero-stone: #FDF9F0;

  --display: "Darker Grotesque", "Avenir Next Condensed", ui-sans-serif, system-ui, sans-serif;
  --mono: "Space Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --cjk: "Hiragino Sans", "Yu Gothic", "Noto Sans CJK JP", "Noto Sans JP", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #14140E;
    --ink: #E6E2D9;
    --ink-soft: #B3B0A0;
    --rule: #E6E2D9;
    --olive: #CECA75;
    --olive-soft: #49482C;
    --on-olive-soft: #E8E4BE;

    --band-bg: #49482C;
    --band-fg: #E8E4BE;
    --band-on: #CECA75;
    --band-off: rgba(255, 255, 255, 0.08);

    --stone-a: #CECA75;
    --stone-b: #49482C;
    --heart: #D8B8D0;
    --gap: #14140E;
    --hero-stone: #E8E4BE;
  }
}

/* The theme switch in the header flips whichever theme the device asks for. */
@media (prefers-color-scheme: light) {
  :root:has(#flip:checked) {
    color-scheme: dark;

    --paper: #14140E;
    --ink: #E6E2D9;
    --ink-soft: #B3B0A0;
    --rule: #E6E2D9;
    --olive: #CECA75;
    --olive-soft: #49482C;
    --on-olive-soft: #E8E4BE;

    --band-bg: #49482C;
    --band-fg: #E8E4BE;
    --band-on: #CECA75;
    --band-off: rgba(255, 255, 255, 0.08);

    --stone-a: #CECA75;
    --stone-b: #49482C;
    --heart: #D8B8D0;
    --gap: #14140E;
    --hero-stone: #E8E4BE;
  }
}
@media (prefers-color-scheme: dark) {
  :root:has(#flip:checked) {
    color-scheme: light;

    --paper: #FDF9F0;
    --ink: #1C1C16;
    --ink-soft: #5E5C4E;
    --rule: #1C1C16;
    --olive: #63611E;
    --olive-soft: #F7F3A1;
    --on-olive-soft: #545210;

    --band-bg: #63611E;
    --band-fg: #FFFFFF;
    --band-on: #F7F3A1;
    --band-off: rgba(255, 255, 255, 0.16);

    --stone-a: #63611E;
    --stone-b: #F7F3A1;
    --heart: #70576B;
    --gap: #FDF9F0;
    --hero-stone: #FDF9F0;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(1.25rem, 1.1rem + 0.5vw, 1.45rem);
  line-height: 1.4;
}

::selection {
  background: var(--olive-soft);
  color: var(--on-olive-soft);
}

a {
  color: inherit;
  text-decoration-line: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.22em;
}
a:hover {
  text-decoration-thickness: 4px;
}
a:focus-visible {
  outline: 3px solid var(--olive);
  outline-offset: 4px;
  border-radius: 2px;
}

[lang="ja"] {
  font-family: var(--cjk);
}

.wrap {
  max-width: 1180px;
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 56px);
}

/* Header */

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 22px;
}
.brand {
  --gap: var(--paper);
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
}
.mark {
  display: block;
  height: 2.5rem;
  width: auto;
}
.top nav {
  display: flex;
  gap: clamp(16px, 3vw, 32px);
  font-family: var(--mono);
  font-size: 0.9rem;
  font-weight: 400;
}

/* Theme switch: a checkbox and its label, so it needs no script. */
.flip-input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: 0;
  opacity: 0;
}
.flip {
  cursor: pointer;
  text-decoration-line: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.22em;
}
.flip:hover {
  text-decoration-thickness: 4px;
}
.flip-input:focus-visible + .flip {
  outline: 3px solid var(--olive);
  outline-offset: 4px;
  border-radius: 2px;
}
.flip .to-light {
  display: none;
}
@media (prefers-color-scheme: dark) {
  .flip .to-dark {
    display: none;
  }
  .flip .to-light {
    display: inline;
  }
}
@media (prefers-color-scheme: light) {
  :root:has(#flip:checked) .flip .to-dark {
    display: none;
  }
  :root:has(#flip:checked) .flip .to-light {
    display: inline;
  }
}
@media (prefers-color-scheme: dark) {
  :root:has(#flip:checked) .flip .to-dark {
    display: inline;
  }
  :root:has(#flip:checked) .flip .to-light {
    display: none;
  }
}

/* Cairn */

.stone-a {
  fill: var(--stone-a);
  stroke: var(--gap);
  stroke-width: 8;
  stroke-linejoin: round;
}
.stone-b {
  fill: var(--stone-b);
  stroke: var(--gap);
  stroke-width: 8;
  stroke-linejoin: round;
}
.heart {
  fill: var(--heart);
  stroke: var(--gap);
  stroke-width: 18;
  stroke-linejoin: round;
}
.ground {
  fill: var(--ink);
  opacity: 0.16;
}

/* Hero */

.hero {
  display: grid;
  align-items: center;
  gap: clamp(32px, 5vw, 64px);
  padding-block: clamp(32px, 6vw, 80px) clamp(56px, 9vw, 112px);
}
@media (min-width: 860px) {
  .hero {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
  }
}

h1 {
  margin: 0;
  font-size: clamp(3.4rem, 2rem + 7vw, 7rem);
  font-weight: 700;
  line-height: 0.92;
  letter-spacing: -0.02em;
  text-wrap: balance;
}
.lede {
  max-width: 28em;
  margin: 1.3em 0 0;
  color: var(--ink-soft);
  font-size: 1.1em;
}
.jump {
  margin: 1.4em 0 0;
}

.hero-art {
  --gap: var(--olive-soft);
  --stone-b: var(--hero-stone);
  justify-self: stretch;
  display: grid;
  place-items: center;
  max-width: 440px;
  padding: clamp(24px, 5vw, 48px);
  border-radius: 36px;
  background: var(--olive-soft);
}
.cairn {
  display: block;
  width: 100%;
  height: auto;
}

@media (prefers-reduced-motion: no-preference) {
  .settle .piece {
    animation: settle 1s cubic-bezier(0.2, 0.7, 0.2, 1) both;
  }
  .settle .p1 {
    animation-delay: 0.1s;
  }
  .settle .p2 {
    animation-delay: 0.4s;
  }
  .settle .p3 {
    animation-delay: 0.75s;
  }
  @keyframes settle {
    0% {
      opacity: 0;
      transform: translateY(-44px);
    }
    55% {
      opacity: 1;
      transform: translateY(5px);
    }
    100% {
      opacity: 1;
      transform: translateY(0);
    }
  }
}

/* Kitae */

.kitae {
  background: var(--band-bg);
  color: var(--band-fg);
}
.kitae a:focus-visible {
  outline-color: var(--band-fg);
}
.kitae-inner {
  display: grid;
  align-items: center;
  gap: clamp(40px, 6vw, 72px);
  padding-block: clamp(56px, 9vw, 112px);
}
@media (min-width: 860px) {
  .kitae-inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
}

.name {
  margin: 0;
  font-size: clamp(5rem, 3rem + 10vw, 9.5rem);
  font-weight: 700;
  line-height: 0.8;
  letter-spacing: -0.03em;
}
.name span {
  margin-left: 0.15em;
  font-size: 0.28em;
  letter-spacing: 0;
}
.kitae p {
  max-width: 27em;
  margin: 1.2em 0 0;
}

.get {
  display: grid;
  gap: 16px;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
}
.get li {
  display: grid;
  grid-template-columns: 6.5rem minmax(0, 1fr);
  align-items: baseline;
  gap: 4px 12px;
}
.get .tag {
  color: var(--band-on);
  font-family: var(--mono);
  font-size: 0.9rem;
  font-weight: 400;
}
.get .links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 24px;
}

.days {
  margin: 0;
}
.cells {
  display: grid;
  grid-auto-flow: column;
  grid-template-columns: repeat(16, 1fr);
  grid-template-rows: repeat(7, auto);
  gap: clamp(3px, 0.6vw, 6px);
}
.cells b,
.cells i,
.cells s {
  display: block;
  aspect-ratio: 1;
  border-radius: clamp(2px, 0.4vw, 4px);
}
.cells b {
  background: var(--band-on);
}
.cells i {
  background: var(--band-off);
}
.cells s {
  background: var(--band-off);
  opacity: 0.45;
}
.days figcaption {
  max-width: 27em;
  margin-top: 1.1rem;
  font-size: 1.1rem;
  opacity: 0.88;
}

/* How we make apps */

.how {
  padding-block: clamp(56px, 9vw, 112px);
}
.how h2 {
  max-width: 11em;
  margin: 0 0 clamp(32px, 5vw, 56px);
  font-size: clamp(2.6rem, 1.6rem + 4vw, 4.2rem);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.015em;
}
.how dl {
  display: grid;
  gap: 36px;
  margin: 0;
}
@media (min-width: 860px) {
  .how dl {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(32px, 4vw, 56px);
  }
}
.how .item {
  padding-top: 18px;
  border-top: 2px solid var(--rule);
}
.how dt {
  color: var(--olive);
  font-family: var(--mono);
  font-size: 1rem;
  font-weight: 400;
}
.how dd {
  max-width: 22em;
  margin: 0.7rem 0 0;
}

/* Footer */

.foot {
  border-top: 2px solid var(--rule);
}
.foot-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 20px 40px;
  padding-block: 32px 48px;
  font-size: 1.15rem;
}
.foot p {
  max-width: 36em;
  margin: 0;
  color: var(--ink-soft);
}
.foot nav {
  display: flex;
  gap: 24px;
  font-family: var(--mono);
  font-size: 0.9rem;
  font-weight: 400;
}