:root {
  --paper: #f3ece0;
  --paper-2: #e9dfcd;
  --card: #fbf7ef;
  --ink: #1b1713;
  --ink-2: #5d5247;
  --ink-3: #8a7d6e;
  --shu: #cf3b25;
  --shu-ink: #a92a17;
  --leaf: #148a55;
  --line: rgba(27, 23, 19, .16);
  --serif: "Shippori Mincho B1", "Hiragino Mincho ProN", "Yu Mincho", Georgia, serif;
  --sans: "Zen Kaku Gothic New", "Hiragino Sans", system-ui, -apple-system, sans-serif;
  --gutter: clamp(16px, 4vw, 56px);
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--paper);
  background-image:
    radial-gradient(1200px 600px at 85% -10%, rgba(207, 59, 37, .07), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, rgba(20, 138, 85, .05), transparent 60%);
  color: var(--ink);
  font: 400 17px/1.55 var(--sans);
  overflow-x: hidden;
}
a { color: inherit; }
[hidden] { display: none !important; }

/* top bar */
.bar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 20px var(--gutter);
}
.mark { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; }
.seal {
  display: inline-grid; place-items: center;
  width: 40px; height: 40px; border-radius: 6px;
  background: var(--shu); color: #fff6ec;
  font: 800 15px/1 var(--serif); letter-spacing: -.02em;
  writing-mode: vertical-rl;
  box-shadow: inset 0 0 0 2px rgba(255, 246, 236, .35);
}
.word { font: 800 22px/1 var(--serif); letter-spacing: .01em; }
.links { display: flex; gap: 8px; }
.ln {
  font: 500 14px/1 var(--sans); text-decoration: none;
  padding: 10px 14px; border: 1px solid var(--line); border-radius: 999px; background: var(--card);
}
.ln:hover { border-color: var(--ink); }
.ln-buy { background: var(--ink); color: var(--paper); border-color: var(--ink); }

/* hero */
.hero {
  display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
  gap: clamp(28px, 5vw, 72px); align-items: start;
  padding: clamp(12px, 3vw, 40px) var(--gutter) clamp(48px, 7vw, 96px);
  max-width: 1320px; margin: 0 auto;
}
.series {
  list-style: none; margin: 0 0 clamp(20px, 3vw, 36px); padding: 0;
  display: flex; flex-wrap: wrap; gap: 8px;
}
.series li {
  display: grid; grid-template-columns: auto auto; grid-template-rows: auto auto; column-gap: 10px; align-items: center;
  padding: 8px 14px 8px 10px; border: 1px solid var(--line); border-radius: 10px; background: rgba(251, 247, 239, .6);
  color: var(--ink-3);
}
.series .k { grid-row: 1 / 3; font: 800 26px/1 var(--serif); color: var(--ink-2); }
.series .r { font: 700 13px/1.1 var(--sans); color: var(--ink-2); }
.series .m { font: 400 12px/1.2 var(--sans); }
.series li.now { border-color: var(--shu); background: var(--card); color: var(--shu-ink); }
.series li.now .k { color: var(--shu); }
.series li.now .r { color: var(--ink); }

h1 {
  margin: 0;
  font: 800 clamp(38px, 6.6vw, 100px)/.95 var(--serif);
  letter-spacing: -.035em;
}
h1 .line { white-space: nowrap; }
h1 .eq { color: var(--shu); }
h1 .sub {
  display: block; margin-top: .32em;
  font: 600 clamp(22px, 2.7vw, 38px)/1.15 var(--serif); letter-spacing: -.01em; color: var(--ink-2);
}
.lede { max-width: 33em; margin: 22px 0 28px; font-size: clamp(16px, 1.35vw, 19px); color: var(--ink-2); }
.lede b { color: var(--ink); font-weight: 700; }

.ca {
  display: flex; align-items: stretch; max-width: 560px;
  border: 1.5px solid var(--ink); border-radius: 12px; background: var(--card); overflow: hidden;
}
.ca-tag {
  display: grid; place-items: center; padding: 0 14px;
  background: var(--ink); color: var(--paper); font: 700 13px/1 var(--sans); text-transform: uppercase; letter-spacing: .08em;
}
.ca-val {
  flex: 1; min-width: 0; padding: 14px 14px;
  font: 500 15px/1.2 ui-monospace, "SF Mono", Menlo, monospace; color: var(--ink-2);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.ca.live .ca-val { color: var(--ink); }
.ca-copy {
  border: 0; border-left: 1px solid var(--line); background: transparent; padding: 0 18px;
  font: 700 14px/1 var(--sans); color: var(--ink); cursor: pointer;
}
.ca-copy:disabled { color: var(--ink-3); cursor: default; }
.ca-copy.done { background: var(--leaf); color: #fff; }

.ctas { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 50px; padding: 0 22px; border-radius: 12px; text-decoration: none;
  font: 700 16px/1 var(--sans); border: 1.5px solid var(--ink);
}
.btn-buy { background: var(--shu); border-color: var(--shu); color: #fff8f0; }
.btn-buy:hover { background: var(--shu-ink); border-color: var(--shu-ink); }
.btn-x { background: var(--card); }
.btn-ghost { border-color: transparent; color: var(--ink-2); padding: 0 8px; }
.btn-ghost:hover { color: var(--ink); }

.copy { min-width: 0; }

/* the pen (signature toy) */
.pen {
  background: var(--card);
  border: 1.5px solid var(--ink); border-radius: 18px;
  padding: 16px 16px 18px;
  box-shadow: 0 1px 0 var(--ink), 0 24px 48px -28px rgba(27, 23, 19, .45);
}
.pen-top { display: flex; justify-content: space-between; align-items: baseline; padding: 2px 4px 12px; }
.pen-title { font: 800 20px/1 var(--serif); }
.pen-stage { font: 500 14px/1 var(--sans); color: var(--ink-2); }
.photo { position: relative; margin: 0; border-radius: 12px; overflow: hidden; aspect-ratio: 1 / 1; background: var(--paper-2); }
.photo img { display: block; width: 100%; height: 100%; object-fit: cover; transition: transform .35s cubic-bezier(.3, 1.6, .5, 1); }
.photo.gulp img { transform: scale(1.035); }
.stamp {
  position: absolute; left: 6%; bottom: 7%;
  display: grid; place-items: center; width: 26%; aspect-ratio: 1 / 1;
  border: 4px solid var(--shu); border-radius: 14px; color: var(--shu);
  font: 800 clamp(22px, 3.2vw, 40px)/1 var(--serif); writing-mode: vertical-rl; letter-spacing: -.04em;
  background: rgba(251, 247, 239, .18);
  opacity: 0; transform: rotate(-8deg) scale(1.8);
  mix-blend-mode: multiply;
  pointer-events: none;
}
.stamp.on { opacity: .92; transform: rotate(-8deg) scale(1); transition: transform .22s cubic-bezier(.2, 1.4, .4, 1), opacity .12s; }

.scale { display: grid; grid-template-columns: auto minmax(0, 1fr); align-items: end; gap: 14px; padding: 14px 4px 4px; }
.weight { display: flex; align-items: baseline; gap: 4px; min-width: 5.2ch; }
.weight .num { font: 800 40px/1 var(--serif); font-variant-numeric: tabular-nums; letter-spacing: -.02em; }
.weight .unit { font: 500 14px/1 var(--sans); color: var(--ink-2); }
.chart { width: 100%; height: 64px; overflow: visible; border-bottom: 1px solid var(--line); }
.chart .w { stroke: var(--ink); stroke-width: 1.2; vector-effect: non-scaling-stroke; }
.chart .up { fill: var(--leaf); stroke: var(--ink); stroke-width: 1.2; vector-effect: non-scaling-stroke; }
.chart .dn { fill: var(--shu); stroke: var(--ink); stroke-width: 1.2; vector-effect: non-scaling-stroke; }
.say { min-height: 3.1em; margin: 10px 4px 14px; color: var(--ink-2); font-size: 15px; }
.pen-ctas { display: flex; gap: 10px; flex-wrap: wrap; }
.feed, .post, .again {
  flex: 1 1 auto; min-height: 54px; border-radius: 12px; cursor: pointer; text-decoration: none;
  display: inline-flex; align-items: center; justify-content: center;
  font: 700 17px/1 var(--sans);
}
.feed { border: 1.5px solid var(--ink); background: var(--ink); color: var(--paper); }
.feed:hover { background: #000; }
.feed:active { transform: translateY(1px); }
.post { border: 1.5px solid var(--shu); background: var(--shu); color: #fff8f0; }
.again { border: 1.5px solid var(--ink); background: transparent; color: var(--ink); flex: 0 1 auto; padding: 0 18px; }
.tally { margin: 12px 4px 0; font-size: 13px; color: var(--ink-3); }

/* faq */
.faq { max-width: 820px; margin: 0 auto; padding: 0 var(--gutter) clamp(56px, 8vw, 112px); }
.faq h2 { font: 800 clamp(26px, 3vw, 36px)/1.1 var(--serif); margin: 0 0 18px; letter-spacing: -.01em; }
.faq details { border-top: 1px solid var(--line); }
.faq details:last-of-type { border-bottom: 1px solid var(--line); }
.faq summary {
  cursor: pointer; list-style: none; padding: 18px 36px 18px 0; position: relative;
  font: 700 18px/1.35 var(--sans);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 4px; top: 50%; transform: translateY(-50%);
  font: 600 24px/1 var(--serif); color: var(--shu);
}
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 0 0 20px; color: var(--ink-2); max-width: 40em; }
.faq a { color: var(--shu-ink); }

.foot {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px;
  padding: 22px var(--gutter) 30px; border-top: 1px solid var(--line);
  font-size: 13px; color: var(--ink-3);
}

/* tablet / phone */
@media (max-width: 900px) {
  .hero { grid-template-columns: minmax(0, 1fr); }
  .pen { max-width: 520px; width: 100%; }
}
@media (max-width: 480px) {
  body { font-size: 16px; }
  .bar { padding-top: 14px; padding-bottom: 14px; }
  .word { font-size: 20px; }
  .seal { width: 36px; height: 36px; font-size: 13px; }
  .ln { padding: 9px 12px; font-size: 13px; }
  .series { gap: 6px; }
  .series li { padding: 6px 10px 6px 8px; column-gap: 7px; }
  .series .k { font-size: 20px; }
  .series .r { font-size: 12px; }
  .series .m { font-size: 11px; }
  .ca-tag { padding: 0 10px; }
  .ca-val { font-size: 13px; padding: 13px 10px; }
  .ca-copy { padding: 0 12px; }
  .btn { flex: 1 1 auto; }
  .btn-ghost { flex: 1 1 100%; }
  .weight .num { font-size: 34px; }
}
@media (max-width: 360px) {
  .series li { padding: 5px 8px 5px 6px; }
  .series .m { display: none; }
  .links .ln-buy { display: none !important; }
}
@media (prefers-reduced-motion: reduce) {
  .photo img, .stamp.on { transition: none; }
  .photo.gulp img { transform: none; }
}

/* 404 (no inline styles: CSP style-src has no unsafe-inline) */
.nf { padding-top: 12vh; }
.nf-say { color: var(--ink-2); }
.nf-home { color: var(--shu-ink); }