/* tau's hard theme (ADR 0013 §8): the tokens, fonts and primitives shared by the public site
   (cloud/universe) and tau-host (cloud/host).

   The brand palette on Void (docs/brand/README.md): Void blue-black with a faint grid and a
   dark-blue code texture, Signal red as the one accent with Ember and Flare for heat, Core
   white type, 1 px lines, square or chamfered corners, HUD rings and neon triangles. Dark
   only: it is the brand.

   Type: Chakra Petch (angular, chamfered letters) for headings and buttons, IBM Plex Sans for
   reading, JetBrains Mono for HUD labels and code.

   How to use it: serve this file next to a `fonts/` directory holding the files named in the
   @font-face rules below and their OFL licences (from @fontsource/chakra-petch,
   @fontsource-variable/ibm-plex-sans and @fontsource-variable/jetbrains-mono), because the
   URLs are relative to this file. The universe's build copies them into public/static/.
   Without the fonts every rule falls back to system faces. Load it before the page's own
   stylesheet.

   CSP: everything here works under `style-src 'self'; img-src 'self' data:`. There is no
   @import and no remote font; the code texture is a data: SVG.

   Motion: every animation here stops under `prefers-reduced-motion: reduce`. The sigil
   classes (`.ch-*`) animate the SVG that cloud/shared/character.ts writes. */

/* ---- fonts ------------------------------------------------------------------------ */

@font-face {
  font-family: "Chakra Petch";
  font-style: normal;
  font-display: swap;
  font-weight: 500;
  src: url("fonts/chakra-petch-latin-ext-500-normal.woff2") format("woff2");
  unicode-range:
    U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329,
    U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F,
    U+A720-A7FF;
}

@font-face {
  font-family: "Chakra Petch";
  font-style: normal;
  font-display: swap;
  font-weight: 500;
  src: url("fonts/chakra-petch-latin-500-normal.woff2") format("woff2");
  unicode-range:
    U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329,
    U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "Chakra Petch";
  font-style: normal;
  font-display: swap;
  font-weight: 600;
  src: url("fonts/chakra-petch-latin-ext-600-normal.woff2") format("woff2");
  unicode-range:
    U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329,
    U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F,
    U+A720-A7FF;
}

@font-face {
  font-family: "Chakra Petch";
  font-style: normal;
  font-display: swap;
  font-weight: 600;
  src: url("fonts/chakra-petch-latin-600-normal.woff2") format("woff2");
  unicode-range:
    U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329,
    U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-display: swap;
  font-weight: 100 700;
  src: url("fonts/ibm-plex-sans-latin-ext-wght-normal.woff2") format("woff2");
  unicode-range:
    U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329,
    U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F,
    U+A720-A7FF;
}

@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-display: swap;
  font-weight: 100 700;
  src: url("fonts/ibm-plex-sans-latin-wght-normal.woff2") format("woff2");
  unicode-range:
    U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329,
    U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-display: swap;
  font-weight: 100 800;
  src: url("fonts/jetbrains-mono-latin-ext-wght-normal.woff2") format("woff2");
  unicode-range:
    U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329,
    U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F,
    U+A720-A7FF;
}

@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-display: swap;
  font-weight: 100 800;
  src: url("fonts/jetbrains-mono-latin-wght-normal.woff2") format("woff2");
  unicode-range:
    U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329,
    U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* ---- tokens ----------------------------------------------------------------------- */

:root {
  /* The brand palette (docs/brand/README.md). */
  --void: #05071a;
  --signal: #ff2e63;
  --ember: #ff7a3d;
  --flare: #ffb25c;
  --core: #fff4e0;

  /* Surfaces, darkest first: Void, then panels lifted toward its blue. */
  --bg: #05071a;
  --bg-2: #0a0d24;
  --bg-3: #10142f;
  /* Lines: hairlines between things, and a stronger one for edges you can act on. */
  --line: #1b2042;
  --line-2: #2d335c;
  /* Type: Core white, muted, faint (faint only for large or decorative text). */
  --text: #f3eee6;
  --muted: #979bb9;
  --faint: #6b7096;
  /* The accent is Signal; Ember is its heat (links, hot states), Flare the brightest. */
  --accent: #ff2e63;
  --accent-hot: #ff7a3d;
  --accent-glow: rgba(255, 46, 99, 0.45);
  --accent-soft: rgba(255, 46, 99, 0.12);
  --accent-line: rgba(255, 46, 99, 0.55);
  /* Text on the accent. */
  --on-accent: #05071a;
  /* The code texture's blue, and the grid. */
  --code: #1b2656;
  --grid: rgba(255, 244, 224, 0.032);
  /* Fire: Signal → Ember → Flare, for beams, floors and lit edges. */
  --fire: linear-gradient(90deg, var(--signal), var(--ember) 55%, var(--flare));
  /* The big letters: Core white, lit from below by the fire. */
  --chrome: linear-gradient(180deg, #ffffff 0%, #fff4e0 55%, #ffc690 100%);

  --font-sans: "IBM Plex Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-display: "Chakra Petch", "IBM Plex Sans", ui-sans-serif, system-ui, sans-serif;
  --font-mono:
    "JetBrains Mono", ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono",
    monospace;

  /* Square corners, chamfers and thin lines, everywhere. */
  --radius: 0;
  --hair: 1px;
  --cut: 10px;

  --page: 76rem;
  --page-wide: 104rem;
  --gutter: clamp(1rem, 4vw, 2.5rem);

  color-scheme: dark;
}

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

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

[hidden] {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  background: var(--bg);
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.005em;
  text-wrap: balance;
}

p,
ul,
ol,
dl,
figure {
  margin: 0;
}

img,
svg {
  max-width: 100%;
}

a {
  color: var(--accent-hot);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
}

a:hover {
  color: var(--text);
}

:focus-visible {
  outline: 1px solid var(--accent);
  outline-offset: 3px;
  box-shadow: 0 0 0 4px var(--accent-soft);
}

code,
kbd {
  font-family: var(--font-mono);
  font-size: 0.84em;
}

code {
  color: var(--text);
  background: var(--bg-3);
  border: 1px solid var(--line);
  padding: 0.08em 0.4em;
  white-space: nowrap;
}

kbd {
  display: inline-block;
  min-width: 1.6em;
  padding: 0 0.35em;
  border: 1px solid var(--line-2);
  color: var(--muted);
  text-align: center;
  line-height: 1.5;
}

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

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.skip {
  position: absolute;
  left: var(--gutter);
  top: -4rem;
  z-index: 20;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: var(--on-accent);
  font-weight: 600;
}

.skip:focus {
  top: 1rem;
}

/* ---- texture ---------------------------------------------------------------------- */

/* A faint square grid. */
.grid-bg {
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 48px 48px;
  background-position: -1px -1px;
}

/* Vertical columns of glyphs in dark blue, like code falling behind glass. Put it on a layer
   of its own (a pseudo-element or an empty div) so its opacity does not touch the content. */
.code-bg {
  background-color: transparent;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='320' font-family='monospace' font-size='12' fill='%231b2656'%3E%3Cg%3E%3Ctext x='6' y='14'%3E1%3C/text%3E%3Ctext x='6' y='30'%3E0%3C/text%3E%3Ctext x='6' y='46'%3E%CF%84%3C/text%3E%3Ctext x='6' y='62'%3E7%3C/text%3E%3Ctext x='6' y='78'%3E%E2%96%B2%3C/text%3E%3Ctext x='6' y='94'%3E0%3C/text%3E%3Ctext x='6' y='110'%3E1%3C/text%3E%3Ctext x='6' y='190'%3E3%3C/text%3E%3Ctext x='6' y='206'%3Ef%3C/text%3E%3Ctext x='6' y='222'%3E0%3C/text%3E%3Ctext x='54' y='62'%3Ea%3C/text%3E%3Ctext x='54' y='78'%3E9%3C/text%3E%3Ctext x='54' y='94'%3E%CF%84%3C/text%3E%3Ctext x='54' y='110'%3E0%3C/text%3E%3Ctext x='54' y='126'%3E1%3C/text%3E%3Ctext x='54' y='142'%3E1%3C/text%3E%3Ctext x='54' y='270'%3E%E2%96%B3%3C/text%3E%3Ctext x='54' y='286'%3E4%3C/text%3E%3Ctext x='54' y='302'%3E0%3C/text%3E%3Ctext x='102' y='14'%3E%E2%96%B3%3C/text%3E%3Ctext x='102' y='30'%3E8%3C/text%3E%3Ctext x='102' y='158'%3E1%3C/text%3E%3Ctext x='102' y='174'%3E0%3C/text%3E%3Ctext x='102' y='190'%3Ec%3C/text%3E%3Ctext x='102' y='206'%3E%CF%84%3C/text%3E%3Ctext x='102' y='222'%3E2%3C/text%3E%3Ctext x='102' y='238'%3E0%3C/text%3E%3Ctext x='150' y='94'%3E5%3C/text%3E%3Ctext x='150' y='110'%3E%E2%96%B2%3C/text%3E%3Ctext x='150' y='126'%3E0%3C/text%3E%3Ctext x='150' y='142'%3E1%3C/text%3E%3Ctext x='150' y='158'%3Ee%3C/text%3E%3Ctext x='150' y='302'%3E1%3C/text%3E%3Ctext x='198' y='30'%3E0%3C/text%3E%3Ctext x='198' y='46'%3E1%3C/text%3E%3Ctext x='198' y='62'%3E%CF%84%3C/text%3E%3Ctext x='198' y='206'%3Eb%3C/text%3E%3Ctext x='198' y='222'%3E6%3C/text%3E%3Ctext x='198' y='238'%3E%E2%96%B3%3C/text%3E%3Ctext x='198' y='254'%3E0%3C/text%3E%3Ctext x='198' y='270'%3E1%3C/text%3E%3C/g%3E%3C/svg%3E");
  background-size: 240px 320px;
}

/* The hero's vertical beams: thin Signal and Ember lines rising from the floor and fading out
   toward the top. Put it on a layer of its own. */
.beams {
  background-image:
    repeating-linear-gradient(
      90deg,
      transparent 0 41px,
      rgba(255, 46, 99, 0.2) 41px 42px,
      transparent 42px 97px,
      rgba(255, 122, 61, 0.24) 97px 99px,
      transparent 99px 137px,
      rgba(255, 46, 99, 0.14) 137px 138px,
      transparent 138px 181px
    ),
    repeating-linear-gradient(
      90deg,
      transparent 0 23px,
      rgba(255, 178, 92, 0.1) 23px 24px,
      transparent 24px 113px
    );
  -webkit-mask-image: linear-gradient(0deg, #000 0%, rgba(0, 0, 0, 0.5) 45%, transparent 90%);
  mask-image: linear-gradient(0deg, #000 0%, rgba(0, 0, 0, 0.5) 45%, transparent 90%);
}

/* The reflecting floor: a lit line, brightest in the middle, with its glow. */
.floor-line {
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--signal) 18%,
    var(--flare) 50%,
    var(--signal) 82%,
    transparent
  );
  box-shadow: 0 0 14px 1px rgba(255, 122, 61, 0.35);
}

/* ---- type ------------------------------------------------------------------------- */

/* The big letters: Core white, lit from below. */
.chrome {
  background: var(--chrome);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

/* A small HUD label: mono, upper case, spaced. */
.kicker {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.75rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  line-height: 1.5;
  text-transform: uppercase;
}

.kicker-accent {
  color: var(--accent);
}

/* A lit square: online, live, on. A hollow one is off. */
.pip {
  display: inline-block;
  flex: none;
  width: 0.5rem;
  height: 0.5rem;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
}

.pip-off {
  background: transparent;
  border: 1px solid var(--faint);
  box-shadow: none;
}

.pip-live {
  animation: pip-pulse 2.4s ease-in-out infinite;
}

@keyframes pip-pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.35;
  }
}

/* ---- surfaces --------------------------------------------------------------------- */

.panel {
  border: 1px solid var(--line);
  background: var(--bg-2);
}

/* HUD corner brackets on any box; `--corner` sets their colour. */
.corners {
  --corner: var(--accent-line);
  --corner-size: 10px;
  background-image:
    linear-gradient(var(--corner), var(--corner)), linear-gradient(var(--corner), var(--corner)),
    linear-gradient(var(--corner), var(--corner)), linear-gradient(var(--corner), var(--corner)),
    linear-gradient(var(--corner), var(--corner)), linear-gradient(var(--corner), var(--corner)),
    linear-gradient(var(--corner), var(--corner)), linear-gradient(var(--corner), var(--corner));
  background-repeat: no-repeat;
  background-size:
    var(--corner-size) 1px,
    1px var(--corner-size),
    var(--corner-size) 1px,
    1px var(--corner-size),
    var(--corner-size) 1px,
    1px var(--corner-size),
    var(--corner-size) 1px,
    1px var(--corner-size);
  background-position:
    left top,
    left top,
    right top,
    right top,
    left bottom,
    left bottom,
    right bottom,
    right bottom;
}

/* A chamfered box: the top-left and bottom-right corners cut at 45°, with a 1 px edge that
   follows the cuts. The edge and the fill are two layers behind the content, so the box's
   own outline (focus) is never clipped. Set `--cut`, `--edge` and `--fill`; the element must
   not set a border or a background of its own. */
.cut {
  --cut: 10px;
  --edge: var(--line-2);
  --fill: var(--bg-2);
  position: relative;
  isolation: isolate;
}

.cut::before,
.cut::after,
.button::before,
.button::after,
.chip::before,
.chip::after {
  content: "";
  position: absolute;
  z-index: -1;
  pointer-events: none;
  transition: background-color 0.15s;
}

.cut::before,
.button::before,
.chip::before {
  inset: 0;
  background-color: var(--edge);
  clip-path: polygon(
    var(--cut) 0,
    100% 0,
    100% calc(100% - var(--cut)),
    calc(100% - var(--cut)) 100%,
    0 100%,
    0 var(--cut)
  );
}

.cut::after,
.button::after,
.chip::after {
  inset: 1px;
  background-color: var(--fill);
  clip-path: polygon(
    calc(var(--cut) - 0.4px) 0,
    100% 0,
    100% calc(100% - var(--cut) + 0.4px),
    calc(100% - var(--cut) + 0.4px) 100%,
    0 100%,
    0 calc(var(--cut) - 0.4px)
  );
}

/* ---- controls --------------------------------------------------------------------- */

.button {
  --cut: 9px;
  --edge: var(--line-2);
  --fill: rgba(10, 13, 36, 0.78);
  position: relative;
  isolation: isolate;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  min-height: 2.75rem;
  padding: 0.55rem 1.3rem;
  border: 0;
  border-radius: var(--radius);
  background: none;
  color: var(--text);
  font-family: var(--font-display);
  font-size: 0.98rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: color 0.15s;
}

.button:hover {
  --edge: var(--accent);
  --fill: rgba(255, 46, 99, 0.14);
  color: var(--text);
}

.button-primary {
  --edge: var(--accent);
  --fill: var(--accent);
  color: var(--on-accent);
}

.button-primary:hover {
  --edge: var(--ember);
  --fill: var(--ember);
  color: var(--on-accent);
}

.button:disabled,
.button[aria-disabled="true"] {
  opacity: 0.45;
  cursor: not-allowed;
}

.button svg {
  flex: none;
  width: 1.1em;
  height: 1.1em;
  fill: currentColor;
}

/* A small choice: a suggestion, a filter. */
.chip {
  --cut: 7px;
  --edge: var(--line-2);
  --fill: var(--bg);
  position: relative;
  isolation: isolate;
  display: inline-flex;
  align-items: center;
  min-height: 2rem;
  padding: 0.25rem 0.85rem;
  border: 0;
  background: none;
  color: var(--text);
  font: inherit;
  font-size: 0.9rem;
  line-height: 1.3;
  text-align: left;
  text-decoration: none;
  cursor: pointer;
}

.chip:hover {
  --edge: var(--accent);
  --fill: rgba(255, 46, 99, 0.12);
  color: var(--text);
}

/* ---- HUD -------------------------------------------------------------------------- */

/* Thin rings for an inline SVG: `.hud-ring` a steady line, `.hud-ticks` a dashed dial,
   `.hud-arc` a lit arc, `.hud-comet` the thinking arc's head, `.hud-spin` / `.hud-spin-back`
   turn them slowly around the SVG's centre and `.hud-think` circles like the hero's comet. */
.hud-ring,
.hud-ticks,
.hud-arc,
.hud-tri {
  fill: none;
  stroke: var(--accent);
  vector-effect: non-scaling-stroke;
}

.hud-ring {
  stroke-opacity: 0.26;
  stroke-width: 1;
}

.hud-ticks {
  stroke: var(--flare);
  stroke-opacity: 0.38;
  stroke-width: 1;
  stroke-dasharray: 1 7;
}

.hud-arc {
  stroke-opacity: 0.85;
  stroke-width: 1.5;
}

.hud-comet,
.hud-tail {
  fill: none;
  stroke: var(--flare);
  stroke-width: 2;
  vector-effect: non-scaling-stroke;
}

.hud-tail {
  stroke: var(--ember);
  stroke-opacity: 0.45;
  stroke-width: 1.5;
}

.hud-frag {
  fill: var(--accent);
  fill-opacity: 0.6;
}

.hud-head {
  fill: var(--core);
}

/* The hero's two neon triangles, faint behind whatever stands on them. */
.hud-tri {
  stroke-width: 1;
  stroke-opacity: 0.32;
  stroke-linejoin: miter;
}

.hud-tri-inner {
  stroke: #ff4d4d;
  stroke-opacity: 0.22;
}

.hud-spin,
.hud-spin-back,
.hud-think {
  transform-box: view-box;
  transform-origin: 50% 50%;
  animation: hud-spin 90s linear infinite;
}

.hud-spin-back {
  animation-duration: 140s;
  animation-direction: reverse;
}

.hud-think {
  animation: hud-spin 7s cubic-bezier(0.55, 0.1, 0.45, 0.9) infinite;
}

@keyframes hud-spin {
  to {
    transform: rotate(360deg);
  }
}

/* A HUD readout: tiny mono text for coordinates, counts and names of instruments. */
.hud-label {
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  line-height: 1.4;
  text-transform: uppercase;
}

/* ---- sigils ----------------------------------------------------------------------- */

/* The SVG of cloud/shared/character.ts. `.ch-anim` turns the motion on: the flame flickers,
   its core pulses, a tau's ring turns. `.ch-p0`…`.ch-p7` shift the phase so a row of sigils
   never moves in step. */
.ch {
  display: inline-block;
  flex: none;
  vertical-align: middle;
  overflow: visible;
}

.ch-anim {
  --ch-delay: 0s;
}

.ch-p1 {
  --ch-delay: -0.37s;
}
.ch-p2 {
  --ch-delay: -0.74s;
}
.ch-p3 {
  --ch-delay: -1.11s;
}
.ch-p4 {
  --ch-delay: -1.48s;
}
.ch-p5 {
  --ch-delay: -1.85s;
}
.ch-p6 {
  --ch-delay: -2.22s;
}
.ch-p7 {
  --ch-delay: -2.59s;
}

.ch-anim .ch-flame,
.ch-anim .ch-flame-in,
.ch-anim .ch-core {
  transform-box: fill-box;
  transform-origin: 50% 100%;
}

.ch-anim .ch-flame {
  animation: ch-flicker 2.1s ease-in-out var(--ch-delay) infinite;
}

.ch-anim .ch-flame-in {
  animation: ch-flicker-in 1.3s ease-in-out var(--ch-delay) infinite;
}

.ch-anim .ch-core {
  animation: ch-pulse 2.8s ease-in-out var(--ch-delay) infinite;
}

.ch-anim .ch-ring,
.ch-anim .ch-ring-back {
  transform-box: view-box;
  transform-origin: 50% 52%;
  animation: hud-spin 48s linear infinite;
}

.ch-anim .ch-ring-back {
  animation-duration: 96s;
  animation-direction: reverse;
}

.ch-anim .ch-spark {
  animation: ch-spark 2.6s ease-out var(--ch-delay) infinite;
}

.ch-anim .ch-s1 {
  animation-delay: calc(var(--ch-delay) - 0.65s);
}

.ch-anim .ch-s2 {
  animation-delay: calc(var(--ch-delay) - 1.3s);
}

.ch-anim .ch-s3 {
  animation-delay: calc(var(--ch-delay) - 1.95s);
}

.ch-anim .ch-ember {
  animation: ch-ember 4.2s ease-in-out var(--ch-delay) infinite;
}

@keyframes ch-flicker {
  0%,
  100% {
    transform: scale(1, 1) skewX(0deg);
  }
  22% {
    transform: scale(0.98, 1.05) skewX(-1.6deg);
  }
  48% {
    transform: scale(1.02, 0.96) skewX(1deg);
  }
  74% {
    transform: scale(0.99, 1.03) skewX(1.8deg);
  }
}

@keyframes ch-flicker-in {
  0%,
  100% {
    transform: scale(1, 1);
  }
  40% {
    transform: scale(0.94, 1.1);
  }
  70% {
    transform: scale(1.04, 0.92);
  }
}

@keyframes ch-pulse {
  0%,
  100% {
    opacity: 0.8;
    transform: scale(0.94);
  }
  50% {
    opacity: 1;
    transform: scale(1.06);
  }
}

@keyframes ch-spark {
  0% {
    opacity: 0;
    transform: translateY(2px);
  }
  30% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: translateY(-5px);
  }
}

@keyframes ch-ember {
  0%,
  100% {
    opacity: 0.9;
    transform: translateY(0);
  }
  50% {
    opacity: 0.45;
    transform: translateY(-2px);
  }
}

/* ---- motion ----------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  .ch-anim .ch-flame,
  .ch-anim .ch-flame-in,
  .ch-anim .ch-core,
  .ch-anim .ch-ring,
  .ch-anim .ch-ring-back,
  .ch-anim .ch-spark,
  .ch-anim .ch-ember,
  .hud-spin,
  .hud-spin-back,
  .hud-think,
  .pip-live {
    animation: none;
  }
}