/*
  Deckle's look, shared by every page: the website (index, companion, letters,
  make, install, privacy) and the app (app.html). Pages add their own layout;
  colours, type, buttons and the drawn X3 come from here, so the product reads
  as one thing.

  Direction: clean and minimal, easy on the eyes. Large bold type (Recoleta),
  a soft paper ground rather than white, near-black ink, one quiet green for
  links and small highlights. The imagery is the device's own screens, drawn
  by its renderer (tools/build_shots.mjs), and the pixel companion.
*/

@font-face {
  font-family: "Recoleta";
  src: url("/fonts/recoleta-medium.woff2") format("woff2"), url("/fonts/recoleta-medium.woff") format("woff");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Recoleta";
  src: url("/fonts/recoleta-bold.woff2") format("woff2"), url("/fonts/recoleta-bold.woff") format("woff");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
/* Body text: Figtree (SIL OFL, fonts/figtree-OFL.txt), self-hosted, so no
   page makes a third-party font request. */
@font-face {
  font-family: "Figtree";
  src: url("/fonts/figtree-latin.woff2") format("woff2");
  font-weight: 300 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Figtree";
  src: url("/fonts/figtree-italic-latin.woff2") format("woff2");
  font-weight: 300 900;
  font-style: italic;
  font-display: swap;
}

:root {
  --paper: #f5f5f1;       /* the page: soft, never pure white */
  --surface: #ffffff;     /* raised things: cards, inputs, the app's panels */
  --surface-2: #efefea;   /* wells, quiet fills */
  --ink: #141414;         /* headlines, primary buttons */
  --ink-2: #3f4145;       /* body text */
  --ink-3: #676a6f;       /* secondary text, captions (5:1 on the paper) */
  --rule: #e2e2dc;        /* hairlines */
  --rule-2: #d3d3cc;      /* quiet outlines (not for inputs) */
  --field: #8a8d91;       /* input and checkbox borders: 3:1 against white and paper */
  --accent: #2c6a55;      /* links, focus, small highlights; used sparingly */
  --accent-soft: #e2ede7;
  --warn: #9a4a16;
  --warn-soft: #f6e9df;
  --good: #2c6a55;
  --stage: #ecebe5;       /* a full-bleed showcase band behind devices */
  --eink-paper: #e4e3dc;  /* the panel itself, as in the shots */
  --eink-ink: #222324;

  --display: "Recoleta", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --text: "Figtree", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  /* Type scale: big and bold at the top, calm below. */
  --t-hero: clamp(3rem, 1.6rem + 6.2vw, 6.75rem);
  --t-1: clamp(2.4rem, 1.5rem + 3.6vw, 4.25rem);
  --t-2: clamp(1.75rem, 1.3rem + 1.8vw, 2.6rem);
  --t-3: clamp(1.3rem, 1.15rem + 0.6vw, 1.6rem);
  --t-lede: clamp(1.15rem, 1.05rem + 0.45vw, 1.4rem);
  --t-body: 1.0625rem;
  --t-small: 0.9375rem;
  --t-tiny: 0.8125rem;

  --gutter: clamp(20px, 5vw, 48px);
  --max: 1180px;
  --section: clamp(88px, 11vw, 160px);
  --radius: 18px;
  --radius-sm: 12px;

  --shadow-1: 0 1px 2px rgba(20, 20, 20, 0.04), 0 2px 8px rgba(20, 20, 20, 0.04);
  --shadow-2: 0 2px 6px rgba(20, 20, 20, 0.05), 0 18px 40px -18px rgba(20, 20, 20, 0.18);

  /* The drawn X3 */
  --x3-body-hi: #fbfbf8;
  --x3-body-lo: #e7e7e1;
  --x3-edge: rgba(20, 20, 20, 0.1);
  --x3-key: #dcdcd5;
  --x3-shadow: rgba(24, 24, 20, 0.28);

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #121314;
    --surface: #1a1b1d;
    --surface-2: #202124;
    --ink: #f3f3ef;
    --ink-2: #c9cac5;
    --ink-3: #8f9195;
    --rule: #2a2c2f;
    --rule-2: #36383c;
    --field: #6b6e73;
    --accent: #8ccab2;
    --accent-soft: #1d2a25;
    --warn: #e3a36f;
    --warn-soft: #2d231b;
    --good: #8ccab2;
    --stage: #1b1c1f;
    --shadow-1: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-2: 0 18px 40px -18px rgba(0, 0, 0, 0.6);
    --x3-body-hi: #3a3b3e;
    --x3-body-lo: #242528;
    --x3-edge: rgba(255, 255, 255, 0.08);
    --x3-key: #2f3033;
    --x3-shadow: rgba(0, 0, 0, 0.55);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #121314;
  --surface: #1a1b1d;
  --surface-2: #202124;
  --ink: #f3f3ef;
  --ink-2: #c9cac5;
  --ink-3: #8f9195;
  --rule: #2a2c2f;
  --rule-2: #36383c;
  --field: #6b6e73;
  --accent: #8ccab2;
  --accent-soft: #1d2a25;
  --warn: #e3a36f;
  --warn-soft: #2d231b;
  --good: #8ccab2;
  --stage: #1b1c1f;
  --shadow-1: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-2: 0 18px 40px -18px rgba(0, 0, 0, 0.6);
  --x3-body-hi: #3a3b3e;
  --x3-body-lo: #242528;
  --x3-edge: rgba(255, 255, 255, 0.08);
  --x3-key: #2f3033;
  --x3-shadow: rgba(0, 0, 0, 0.55);
  color-scheme: dark;
}

/* ------------------------------------------------------------------ base */

*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink-2);
  font: 400 var(--t-body) / 1.65 var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img,
svg {
  max-width: 100%;
  display: block;
}
a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}
a:hover {
  text-decoration-thickness: 2px;
}
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}
::selection {
  background: var(--accent-soft);
  color: var(--ink);
}
[hidden] {
  display: none !important;
}

figure {
  margin: 0;
}
h1,
h2,
h3,
.display {
  line-height: 1.15;
  font-family: var(--display);
  color: var(--ink);
  font-weight: 700;
  letter-spacing: -0.015em;
  text-wrap: balance;
  margin: 0;
}
.t-hero {
  font-size: var(--t-hero);
  line-height: 0.98;
  letter-spacing: -0.025em;
}
.t-1 {
  font-size: var(--t-1);
  line-height: 1.02;
}
.t-2 {
  font-size: var(--t-2);
  line-height: 1.08;
}
.t-3 {
  font-size: var(--t-3);
  line-height: 1.2;
  font-weight: 500;
}
.lede {
  font-size: var(--t-lede);
  line-height: 1.55;
  color: var(--ink-2);
  max-width: 36em;
  text-wrap: pretty;
}
.muted {
  color: var(--ink-3);
}
p {
  margin: 0 0 1em;
  text-wrap: pretty;
}

.wrap {
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.stack > * + * {
  margin-top: var(--gap, 1rem);
}
.vh {
  position: absolute !important;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ------------------------------------------------------------------ buttons */

.btn {
  --b-bg: var(--ink);
  --b-fg: var(--paper);
  --b-bd: var(--ink);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  min-height: 48px;
  padding: 0 1.4em;
  border-radius: 999px;
  border: 2px solid var(--b-bd);
  background: var(--b-bg);
  color: var(--b-fg);
  font: 600 1rem/1 var(--text);
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s ease, background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}
.btn:hover {
  transform: translateY(-1px);
  text-decoration: none;
}
.btn:active {
  transform: translateY(0);
}
.btn[disabled],
.btn[aria-disabled="true"] {
  opacity: 0.45;
  cursor: default;
  transform: none;
}
.btn-quiet {
  --b-bg: transparent;
  --b-fg: var(--ink);
  --b-bd: var(--rule-2);
}
.btn-quiet:hover {
  --b-bd: var(--ink);
}
.btn-accent {
  --b-bg: var(--accent);
  --b-fg: var(--paper);
  --b-bd: var(--accent);
}
.btn-sm {
  min-height: 38px;
  padding: 0 1.05em;
  font-size: 0.9375rem;
}
.btn-lg {
  min-height: 56px;
  padding: 0 1.8em;
  font-size: 1.0625rem;
}
.link-arrow {
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
}
.link-arrow::after {
  content: "→";
  transition: transform 0.15s ease;
}
.link-arrow:hover::after {
  transform: translateX(3px);
}

/* ------------------------------------------------------------------ the X3
  A drawn XTEINK X3 around a real screen:

    <figure class="x3" style="--w: 320px">
      <div class="x3-screen"><img src="/shots/sleep.png" alt="..." width="528" height="792"></div>
    </figure>

  Size it with --w set to one of the exact sizes below (--x3-sm, --x3-lg,
  --x3-ph), never vw or clamp(): the screen is 88% of --w, and only these
  land the panel's pixels on whole device pixels at 1x, 1.5x, 2x and 3x.
  Everything inside is in units of --w, so it scales without distorting. .x3.x3-graphite draws the dark model; .x3.tilt
  turns it a little in space. The four face keys sit under the screen; the
  side keys and Power are drawn on the edges, as on the real device.
  .x3.x4 draws the X4 instead (below).
*/
.x3 {
  --w: 300px;
  --u: calc(var(--w) / 100);
  position: relative;
  /* Always exactly --w wide: everything inside is drawn in units of --w, so a
     device squeezed by max-width would stop matching its own insides. Size it
     with --w (clamp() and min() are fine) instead. */
  width: var(--w);
  flex: none;
  margin: 0;
  aspect-ratio: 100 / 150;
  border-radius: calc(var(--u) * 4);
  background: linear-gradient(165deg, var(--x3-body-hi) 0%, var(--x3-body-lo) 100%);
  box-shadow:
    inset 0 0 0 1px var(--x3-edge),
    inset 0 calc(var(--u) * 0.6) calc(var(--u) * 0.8) rgba(255, 255, 255, 0.55),
    inset 0 calc(var(--u) * -0.8) calc(var(--u) * 1.6) rgba(0, 0, 0, 0.06),
    0 calc(var(--u) * 2) calc(var(--u) * 4) calc(var(--u) * -2) var(--x3-shadow),
    0 calc(var(--u) * 14) calc(var(--u) * 26) calc(var(--u) * -12) var(--x3-shadow);
  padding: calc(var(--u) * 6) calc(var(--u) * 6) 0;
  isolation: isolate;
}
/* The white model whatever the page's theme (.x3 follows the theme). */
.x3.x3-light {
  --x3-body-hi: #fbfbf8;
  --x3-body-lo: #e7e7e1;
  --x3-edge: rgba(20, 20, 20, 0.1);
  --x3-key: #dcdcd5;
  --x3-shadow: rgba(24, 24, 20, 0.28);
}
/* On a dark page every X3 is the graphite model: a white one glares brighter
   than its own (dimmed) screen, and one device per theme reads calmer. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .x3.x3-light {
    --x3-body-hi: #3a3b3e;
    --x3-body-lo: #1f2022;
    --x3-edge: rgba(255, 255, 255, 0.08);
    --x3-key: #2d2e31;
    --x3-shadow: rgba(0, 0, 0, 0.6);
  }
}
:root[data-theme="dark"] .x3.x3-light {
  --x3-body-hi: #3a3b3e;
  --x3-body-lo: #1f2022;
  --x3-edge: rgba(255, 255, 255, 0.08);
  --x3-key: #2d2e31;
  --x3-shadow: rgba(0, 0, 0, 0.6);
}
.x3.x3-graphite {
  --x3-body-hi: #3a3b3e;
  --x3-body-lo: #1f2022;
  --x3-edge: rgba(255, 255, 255, 0.08);
  --x3-key: #2d2e31;
}
/* side keys and Power */
.x3::before,
.x3::after {
  content: "";
  position: absolute;
  background: var(--x3-body-lo);
  box-shadow: inset 0 0 0 1px var(--x3-edge);
  z-index: -1;
}
.x3::before {
  /* left and right side keys, one element drawn twice with a shadow */
  top: 34%;
  left: calc(var(--u) * -0.9);
  width: calc(var(--u) * 1.4);
  height: 11%;
  border-radius: calc(var(--u) * 0.8);
  box-shadow: inset 0 0 0 1px var(--x3-edge), calc(var(--w) + var(--u) * 0.4) 0 0 0 var(--x3-body-lo);
}
.x3::after {
  /* Power, on the top edge */
  top: calc(var(--u) * -0.9);
  right: 18%;
  width: 13%;
  height: calc(var(--u) * 1.4);
  border-radius: calc(var(--u) * 0.8);
}
.x3-screen {
  position: relative;
  width: 100%;
  aspect-ratio: 528 / 792;
  border-radius: calc(var(--u) * 1.4);
  overflow: hidden;
  background: var(--eink-paper);
  box-shadow:
    inset 0 0 0 1px rgba(0, 0, 0, 0.14),
    0 0 0 calc(var(--u) * 0.6) rgba(0, 0, 0, 0.035);
}
.x3-screen img,
.x3-screen canvas {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
/* E-ink gives off no light: on a dark page a bright panel glares, so it is
   shown a little dimmer, as it would look in a dim room. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .x3-screen {
    filter: brightness(0.84);
  }
}
:root[data-theme="dark"] .x3-screen {
  filter: brightness(0.84);
}
/* a faint sheen: glass over paper */
.x3-screen::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(125deg, rgba(255, 255, 255, 0.16) 0%, rgba(255, 255, 255, 0) 38%),
    radial-gradient(120% 80% at 50% 0%, rgba(255, 255, 255, 0.06), transparent 60%);
  pointer-events: none;
  box-shadow: inset 0 calc(var(--u) * 0.8) calc(var(--u) * 1.6) rgba(0, 0, 0, 0.08);
}
/* the four face keys, drawn under the screen */
.x3 {
  background-image:
    radial-gradient(closest-side, var(--x3-key) 97%, transparent 100%),
    radial-gradient(closest-side, var(--x3-key) 97%, transparent 100%),
    radial-gradient(closest-side, var(--x3-key) 97%, transparent 100%),
    radial-gradient(closest-side, var(--x3-key) 97%, transparent 100%),
    linear-gradient(165deg, var(--x3-body-hi) 0%, var(--x3-body-lo) 100%);
  background-size:
    16% 2.6%,
    16% 2.6%,
    16% 2.6%,
    16% 2.6%,
    100% 100%;
  background-position:
    13% 95.2%,
    37.7% 95.2%,
    62.3% 95.2%,
    87% 95.2%,
    0 0;
  background-repeat: no-repeat;
}
/* The X4: the same drawing, taller and with wider bezels, around its 480 x 800
   panel. Add .x4 to the figure, or data-model="x4" to anything around it (the
   app puts it on <html> for an X4 owner). The screen is 80% of the device,
   10u of bezel each side, so the exact sizes below land the X4's 480 pixels
   on whole device pixels too: 300px has a 240px screen, exact at 2x. The face
   keys sit in the middle of its deeper chin. */
.x3.x4,
[data-model="x4"] .x3 {
  aspect-ratio: 100 / 165;
  padding: calc(var(--u) * 10) calc(var(--u) * 10) 0;
  background-size:
    16% 2.36%,
    16% 2.36%,
    16% 2.36%,
    16% 2.36%,
    100% 100%;
  background-position:
    13% 94.5%,
    37.7% 94.5%,
    62.3% 94.5%,
    87% 94.5%,
    0 0;
}
.x3.x4 .x3-screen,
[data-model="x4"] .x3 .x3-screen {
  aspect-ratio: 480 / 800;
}
.x3.tilt {
  transform: perspective(1800px) rotateY(-16deg) rotateX(5deg) rotateZ(1deg);
  transform-style: preserve-3d;
}
.x3.tilt-left {
  transform: perspective(1800px) rotateY(16deg) rotateX(5deg) rotateZ(-1deg);
}
@media (prefers-reduced-motion: no-preference) {
  .x3.float {
    animation: x3-float 7s ease-in-out 3;
  }
  @keyframes x3-float {
    50% {
      translate: 0 -8px;
    }
  }
}

/* The exact sizes. 300px has a 264px screen (half the panel: exact at 2x);
   600px has 528 (exact at 1x); 400px has 352 (exact at 1.5x and 3x); 200px
   has 176 (exact at 3x). */
:root {
  --x3-sm: 300px;
  --x3-lg: 600px;
  --x3-ph: 300px;
}
@media (min-resolution: 1.5dppx) and (max-resolution: 1.99dppx), (-webkit-min-device-pixel-ratio: 1.5) and (-webkit-max-device-pixel-ratio: 1.99) {
  :root {
    --x3-lg: 400px;
  }
}
@media (min-resolution: 2.5dppx), (-webkit-min-device-pixel-ratio: 2.5) {
  :root {
    --x3-sm: 200px;
    --x3-ph: 400px;
  }
}
@media (max-width: 359px) and (max-resolution: 2.49dppx) {
  :root {
    --x3-sm: 272px;
    --x3-ph: 272px;
  }
}
/* From 2x up every screen gets at least one device pixel per panel pixel, so
   keep each one whole. (Below 2x smoothing a smaller screen is kinder than
   dropping rows.) */
@media (min-resolution: 2dppx), (-webkit-min-device-pixel-ratio: 2) {
  .x3 .x3-screen img,
  .x3 .x3-screen canvas {
    image-rendering: pixelated;
  }
}

/* A close look at the panel's pixels: put a shot in, crop with --x/--y/--zoom. */
.pixels {
  width: 100%;
  min-width: 0;
  --zoom: 3;
  --x: 0%;
  --y: 0%;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--eink-paper);
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.08);
}
.pixels img {
  width: calc(100% * var(--zoom));
  max-width: none;
  image-rendering: pixelated;
  translate: calc(-1 * var(--x)) calc(-1 * var(--y));
}

/* Pixel companions (shots/looks/<look>-<mood>.svg) scale crisply at any size. */
.sprite {
  image-rendering: pixelated;
  width: var(--s, 96px);
  height: var(--s, 96px);
}
/* The svgs are drawn in e-ink ink; .adapt flips any of them on dark grounds. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .adapt {
    filter: invert(1) brightness(0.95);
  }
}
:root[data-theme="dark"] .adapt {
  filter: invert(1) brightness(0.95);
}

/* ------------------------------------------------------------------ small parts */

.card {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
}
.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.3em 0.8em;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--ink-2);
  font: 600 var(--t-tiny) / 1.3 var(--text);
}
.pill.good {
  background: var(--accent-soft);
  color: var(--accent);
}
.rule {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 0;
}