:root {
  --bath: #26292b;          /* page = the dye bath; JS darkens it toward the current dye */
  --dye: #24365c;
  --poly: #e7e6e0;          /* undyed polyester white */
  --muted: rgba(231, 230, 224, 0.7);
  --thread: #efe9da;        /* sashiko cotton */
  --display: "Big Shoulders Display", "Arial Narrow", "Helvetica Neue", Impact, sans-serif;
  --serif: "Newsreader", Georgia, "Times New Roman", serif;
}

* { box-sizing: border-box; }
html { background: var(--bath); scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  color: var(--poly);
  font-family: var(--serif);
  font-size: 1.125rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

#bath {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100lvh;
  display: block;
  z-index: 0;
  touch-action: pan-y;
  -webkit-touch-callout: none;
}
.no-webgl #bath { display: none; }
.no-webgl body {
  background:
    radial-gradient(60% 40% at 50% 30%, color-mix(in srgb, var(--dye) 70%, #ddd) 0%, transparent 70%),
    var(--bath);
  background-attachment: fixed;
}

main { position: relative; z-index: 1; }

/* ---------- panels: text sits low on phones, left on wide screens ---------- */
.panel {
  -webkit-touch-callout: none;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}
.copy {
  width: 100%;
  padding: 7rem 1.5rem calc(2.75rem + env(safe-area-inset-bottom, 0px));
  background: linear-gradient(to top, var(--bath) 0%, color-mix(in srgb, var(--bath) 88%, transparent) 62%, transparent 100%);
}
.copy > * { max-width: 34rem; }

h1, h2 { font-family: var(--display); font-weight: 900; margin: 0; }
h2 {
  font-size: clamp(2.75rem, 12vw, 5.5rem);
  line-height: 0.88;
  letter-spacing: -0.005em;
  margin-bottom: 1rem;
  text-wrap: balance;
}
p { margin: 0 0 1rem; }

/* ---------- hero ---------- */
.hero { justify-content: space-between; }
.logo {
  margin: 0;
  padding: calc(1.25rem + env(safe-area-inset-top, 0px)) 1.25rem 0;
  pointer-events: none;
}
.logo img {
  display: block;
  width: min(92vw, 34rem);
  height: auto;
  filter: invert(1);           /* black master → white, then: */
  mix-blend-mode: difference;  /* reads light on the bath, dark on the white apron */
}
.tagline {
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(2.6rem, 11.5vw, 5rem);
  line-height: 0.9;
  margin-bottom: 0.9rem;
  text-wrap: balance;
}
.lede { font-size: 1.2rem; line-height: 1.45; }
.hint { font-style: italic; color: var(--muted); font-size: 1rem; margin: 0; }

/* ---------- process ---------- */
.num {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.1rem;
  width: 2.1rem; height: 2.1rem;
  display: grid; place-items: center;
  border: 2px dashed var(--thread);   /* a sashiko running stitch */
  border-radius: 50%;
  margin-bottom: 0.9rem;
}

/* ---------- colorways ---------- */
.swatches {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
  margin-top: 1.25rem;
}
.swatch {
  font: inherit;
  color: inherit;
  text-align: left;
  display: grid;
  grid-template-columns: 2.25rem 1fr;
  grid-template-rows: auto auto;
  column-gap: 0.7rem;
  align-items: center;
  padding: 0.6rem 0.7rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(231, 230, 224, 0.18);
  border-radius: 3px;
  cursor: pointer;
}
.swatch .chip {
  grid-row: 1 / 3;
  width: 2.25rem; height: 2.25rem;
  border-radius: 2px;
  background:
    radial-gradient(circle at 30% 35%, var(--c-pale) 0 20%, transparent 42%),
    radial-gradient(circle at 72% 70%, var(--c-deep) 0 22%, transparent 48%),
    var(--c);
}
.sw-name { font-weight: 500; font-size: 1rem; line-height: 1.2; }
.sw-after { font-style: italic; font-size: 0.85rem; color: var(--muted); line-height: 1.25; }
.swatch[aria-pressed="true"] { border: 2px dashed var(--thread); padding: calc(0.6rem - 1px) calc(0.7rem - 1px); }

/* ---------- pH bath ---------- */
.ph { margin-top: 1.25rem; }
.ph-top { display: flex; align-items: center; gap: 1rem; }
.strip {
  width: 0.9rem; height: 5.5rem;
  background: #ece9df;
  border-radius: 2px;
  display: flex; align-items: flex-end;
  padding: 0.3rem 0.15rem;
  flex: none;
}
.pad { display: block; width: 100%; height: 1.6rem; border-radius: 1px; transition: background 0.8s ease; }
.ph-read { margin: 0; font-family: var(--display); font-weight: 900; line-height: 0.85; }
.ph-unit { font-size: 1.6rem; font-weight: 700; color: var(--muted); }
.ph-val { font-size: clamp(4.5rem, 20vw, 6.5rem); font-variant-numeric: tabular-nums; }
.ph-status { color: var(--muted); min-height: 3.2em; margin-top: 0.75rem; }
.ph-actions { display: flex; flex-wrap: wrap; gap: 0.6rem; }

button#phDose, .cta {
  font: 500 1rem/1 var(--serif);
  color: #1b1a18;
  background: var(--thread);
  border: none;
  border-radius: 2px;
  padding: 0.85rem 1.1rem;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}
button#phDose:disabled { opacity: 0.4; cursor: default; }
button.quiet {
  font: 400 1rem/1 var(--serif);
  color: var(--poly);
  background: none;
  border: 1px solid rgba(231, 230, 224, 0.35);
  border-radius: 2px;
  padding: 0.85rem 1.1rem;
  cursor: pointer;
}

/* ---------- hangtag ---------- */
.tag {
  position: relative;
  margin: 0;
  background: #e3dccb;
  color: #2a2722;
  padding: 2.75rem 1.4rem 1.4rem;
  border-radius: 4px 4px 4px 4px;
  clip-path: polygon(14% 0, 86% 0, 100% 7%, 100% 100%, 0 100%, 0 7%);
  font-size: 1rem;
  line-height: 1.55;
  transform: rotate(-1.5deg);
}
.eyelet {
  position: absolute; top: 0.9rem; left: 50%;
  width: 0.9rem; height: 0.9rem; margin-left: -0.45rem;
  border-radius: 50%;
  background: var(--bath);
  box-shadow: 0 0 0 3px #b9ae95;
}
.tag-logo { display: block; width: 70%; height: auto; margin: 0 auto 1.1rem; opacity: 0.88; }
.tag-sign { font-style: italic; margin: 1.1rem 0 0; padding-top: 0.9rem; border-top: 2px dashed #2a2722; }

/* ---------- join ---------- */
.cta { margin: 0.5rem 0 2.5rem; }
.foot { font-size: 0.9rem; color: var(--muted); font-style: italic; margin: 0; }

/* ---------- focus ---------- */
:focus-visible { outline: 2px dashed var(--thread); outline-offset: 3px; }
.tag :focus-visible { outline-color: #2a2722; }

/* ---------- wide screens: copy left, apron right ---------- */
@media (min-width: 900px) and (min-aspect-ratio: 1/1) {
  .panel { justify-content: center; }
  .hero { justify-content: space-between; }
  .copy {
    width: min(46vw, 40rem);
    padding: 4rem 3rem 4rem max(4rem, 7vw);
    background: linear-gradient(to right, color-mix(in srgb, var(--bath) 80%, transparent) 55%, transparent);
  }
  .hero .copy { padding-bottom: 3.5rem; }
  .logo { padding: 2.5rem max(3.5rem, 6.5vw) 0; }
  .logo img { width: min(40vw, 38rem); }
  .tagline { font-size: clamp(3.5rem, 5.5vw, 5.5rem); }
  h2 { font-size: clamp(3.5rem, 6vw, 6rem); }
}