:root {
  --page: #efeff2;
  --card: #fff;
  --ink: #1c1c1c;
  --muted: #6d6d72;
  --line: rgba(0, 0, 0, 0.08);
  --blue: #2f5bff;
  --sans: "IBM Plex Sans", "Helvetica Neue", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: auto; }
body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: var(--sans);
  font-synthesis: none;
  font-size: 15px;
  line-height: 1.45;
}
button, input { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: inherit; }

.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

.top {
  position: sticky;
  top: 0;
  z-index: 4;
  display: flex;
  align-items: center;
  gap: 20px;
  height: 56px;
  padding: 0 20px;
  background: #fff;
  border-bottom: 1px solid var(--line);
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  font-weight: 500;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.mark {
  width: 14px;
  height: 14px;
  border-radius: 4px;
  background: var(--blue);
}
.search { flex: 1; max-width: 360px; margin-left: auto; }
.search input {
  width: 100%;
  height: 44px;
  font-size: 16px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fafafa;
}
.search input:focus-visible { background: #fff; }

.filters {
  display: flex;
  gap: 4px;
  padding: 14px 20px 0;
  overflow-x: auto;
}
.filters[hidden],
.search[hidden] { display: none; }
.filters button {
  flex: none;
  white-space: nowrap;
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 6px 10px;
  min-height: 44px;
  border-radius: 7px;
}
.filters button[aria-pressed="true"] {
  color: var(--ink);
  background: #fff;
  box-shadow: inset 0 0 0 1px var(--line);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 14px;
  padding: 14px 20px 28px;
}
.note {
  margin: 0;
  padding: 0 20px 40px;
  color: var(--muted);
  font-size: 13px;
  max-width: 62ch;
}
.collection-note {
  max-width: 85ch;
  margin: 16px 20px 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}
.study-status { display: block; color: var(--muted); font-size: 11px; }
.empty {
  padding: 48px 20px;
  color: var(--muted);
}

.card {
  display: flex;
  flex-direction: column;
  padding: 0;
  text-align: left;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.03);
}
.card:hover .more { border-color: rgba(0, 0, 0, 0.38); }

.pv {
  position: relative;
  height: 168px;
  overflow: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--body);
  font-feature-settings: var(--features);
}
.pv i { position: absolute; display: block; }
.pv b {
  position: absolute;
  margin: 0;
  font-family: var(--display);
  font-weight: var(--dw);
  letter-spacing: var(--track);
  text-transform: var(--case);
  line-height: 1;
  color: var(--ink);
}

.pv[data-kind="window"] .s1,
.pv[data-kind="window"] .s2,
.pv[data-kind="window"] .s3 {
  left: 18px;
  right: 56px;
  height: 10px;
  border-radius: 5px;
  background: var(--surface);
  box-shadow: inset 0 0 0 1px var(--line);
}
.pv[data-kind="window"] .s1 { top: 40px; box-shadow: inset 3px 0 0 var(--accent), inset 0 0 0 1px var(--line); }
.pv[data-kind="window"] .s2 { top: 60px; }
.pv[data-kind="window"] .s3 { top: 80px; opacity: 0.55; }
.pv[data-kind="window"] b {
  right: 14px;
  bottom: 16px;
  padding: 5px 8px;
  font-family: var(--body);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0;
  background: var(--accent);
  color: var(--on);
  border-radius: var(--r);
}

.pv[data-kind="mesh"] .s1,
.pv[data-kind="mesh"] .s2 {
  width: 190px;
  height: 190px;
  border-radius: 50%;
  filter: blur(16px);
}
.pv[data-kind="mesh"] .s1 { background: var(--c2); right: -48px; top: -64px; }
.pv[data-kind="mesh"] .s2 { background: var(--c3); left: -40px; bottom: -70px; }
.pv[data-kind="mesh"] .s3 {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  background: var(--accent);
  right: 36px;
  bottom: 18px;
  opacity: 0.85;
  filter: blur(8px);
}
.pv[data-kind="mesh"] b {
  left: 16px;
  bottom: 18px;
  font-size: 28px;
  max-width: 70%;
}

.pv[data-kind="blocks"] .s1,
.pv[data-kind="blocks"] .s2,
.pv[data-kind="blocks"] .s3 { border-radius: 18px; }
.pv[data-kind="blocks"] .s1 { width: 78px; height: 78px; left: 22px; top: 32px; background: var(--c2); }
.pv[data-kind="blocks"] .s2 { width: 58px; height: 58px; left: 108px; top: 62px; background: var(--c3); }
.pv[data-kind="blocks"] .s3 { width: 36px; height: 96px; right: 22px; top: 28px; background: var(--accent); border-radius: 18px; }
.pv[data-kind="blocks"] b { display: none; }

.pv[data-kind="paper"] b {
  left: 16px;
  right: 16px;
  top: 28px;
  font-size: 32px;
  line-height: 1;
  text-transform: none;
}
.pv[data-kind="paper"] .s1 {
  left: 16px;
  right: 36px;
  bottom: 52px;
  height: 1px;
  background: var(--line);
}
.pv[data-kind="paper"] .s2 {
  left: 16px;
  bottom: 16px;
  height: 22px;
  padding: 0 8px;
  background: var(--action);
  color: var(--on);
  border-radius: var(--r);
  font-family: var(--body);
  font-size: 11px;
  font-style: normal;
  line-height: 22px;
}
.pv[data-kind="paper"] .s2::after { content: attr(data-label); }

.pv[data-kind="stack"] b {
  left: 12px;
  bottom: 8px;
  font-size: 52px;
  letter-spacing: -0.05em;
  white-space: nowrap;
}
.pv[data-kind="stack"] .s1 {
  left: 14px;
  top: 16px;
  width: 36px;
  height: 6px;
  background: var(--c2);
  border-radius: 99px;
}

.pv[data-kind="pills"] .s1 {
  width: 92px;
  height: 30px;
  left: 20px;
  top: 36px;
  border-radius: 999px;
  background: var(--action);
}
.pv[data-kind="pills"] .s2 {
  width: 58px;
  height: 30px;
  left: 122px;
  top: 36px;
  border-radius: 999px;
  box-shadow: inset 0 0 0 1px var(--line);
}
.pv[data-kind="pills"] .s3 {
  width: 72px;
  height: 48px;
  left: 20px;
  top: 82px;
  border-radius: 14px;
  background: var(--surface);
  box-shadow: inset 0 0 0 1px var(--line);
}
.pv[data-kind="pills"] b { display: none; }

.pv[data-kind="poster"] .s1 {
  left: 0;
  right: 0;
  top: 0;
  height: 10px;
  background: var(--accent);
}
.pv[data-kind="poster"] .s2 {
  right: 16px;
  top: 24px;
  width: 22px;
  height: 22px;
  background: var(--c2);
}
.pv[data-kind="poster"] b {
  left: 12px;
  right: 12px;
  bottom: 16px;
  font-size: 46px;
  line-height: 0.85;
  white-space: nowrap;
}

.pv[data-kind="signal"] .s1 {
  width: 70px;
  height: 70px;
  left: 22px;
  top: 28px;
  background: var(--accent);
  border-radius: 10px;
}
.pv[data-kind="signal"] .s2 {
  width: 46px;
  height: 46px;
  left: 108px;
  top: 48px;
  border-radius: 50%;
  box-shadow: inset 0 0 0 2px var(--ink);
}
.pv[data-kind="signal"] b {
  left: 22px;
  bottom: 16px;
  font-size: 16px;
  text-transform: none;
}

.pv[data-kind="grid"] {
  background-color: var(--bg);
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 28px 28px;
}
.pv[data-kind="grid"] .s1 {
  width: 56px;
  height: 56px;
  left: 28px;
  top: 28px;
  background: var(--c2);
  box-shadow: inset 0 0 0 1px var(--ink);
}
.pv[data-kind="grid"] b {
  left: 16px;
  bottom: 12px;
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0;
  text-transform: none;
  background: var(--bg);
  padding: 2px 4px;
}

.foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 10px 10px 14px;
  min-height: 58px;
}
.foot h2 {
  margin: 0;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.01em;
}
.foot p {
  margin: 1px 0 0;
  color: var(--muted);
  font-size: 12px;
}
.more {
  flex: none;
  min-height: 44px;
  padding: 0 10px;
  border: 1px solid rgba(0, 0, 0, 0.12);
  border-radius: 8px;
  background: #fff;
  font-size: 13px;
}

.sheet {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 28px;
  max-width: 1120px;
  margin: 0 auto;
  padding: 20px 20px 64px;
}
.back {
  grid-column: 1 / -1;
  justify-self: start;
  border: 0;
  background: transparent;
  padding: 4px 0;
  color: var(--muted);
  min-height: 44px;
}
.back:hover { color: var(--ink); }

.specimen {
  align-self: start;
  min-height: 460px;
  padding: 28px;
  border-radius: var(--rc);
  background: var(--bg);
  color: var(--ink);
  font-family: var(--body);
  font-feature-settings: var(--features);
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.06);
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.specimen[data-kind="mesh"] {
  background:
    radial-gradient(420px 240px at 100% -10%, var(--c2), transparent 70%),
    radial-gradient(380px 260px at -10% 110%, var(--c3), transparent 68%),
    var(--bg);
}
.sp-top {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.sp-top strong {
  font-family: var(--display);
  font-weight: var(--dw);
  letter-spacing: var(--track);
}
.sp-top span { color: var(--muted); font-size: 13px; }
.sp-top .sp-btn { margin-left: auto; }
.specimen-label {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}
.sp-h {
  margin: 12px 0 0;
  font-family: var(--display);
  font-weight: var(--dw);
  font-size: clamp(40px, 5vw, 64px);
  line-height: 1.02;
  letter-spacing: var(--track);
  text-transform: var(--case);
  text-wrap: balance;
}
.specimen[data-kind="poster"] .sp-h,
.specimen[data-kind="stack"] .sp-h {
  font-size: clamp(64px, 8vw, 108px);
  line-height: 0.88;
}
.sp-p {
  margin: 0;
  max-width: 38ch;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.5;
}
.sp-row { display: flex; gap: 10px; flex-wrap: wrap; }
.sp-btn, .sp-ghost, .sp-in {
  font-family: var(--control);
  border-radius: var(--r);
  border: 1px solid transparent;
}
.sp-btn, .sp-ghost {
  min-height: 44px;
  padding: 0 14px;
  text-transform: var(--case);
  letter-spacing: 0.01em;
}
.sp-btn { background: var(--action); color: var(--on); box-shadow: var(--sh); }
.sp-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.sp-card {
  margin-top: auto;
  padding: 16px;
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: var(--rc);
  box-shadow: var(--sh);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
}
.sp-card b {
  font-family: var(--display);
  font-size: 28px;
  font-weight: var(--dw);
  letter-spacing: var(--track);
}
.sp-k { color: var(--muted); font-size: 13px; }
.sp-in {
  width: 100%;
  height: 44px;
  font-size: 16px;
  margin-top: 8px;
  padding: 0 10px;
  background: var(--bg);
  color: var(--ink);
  border-color: var(--line);
}

.meta h2 {
  margin: 22px 0 8px;
  font-size: 15px;
  font-weight: 500;
}
.meta .lead {
  margin: 0;
  font-size: 16px;
  line-height: 1.5;
  max-width: 42ch;
  text-wrap: pretty;
}
.who {
  display: flex;
  gap: 10px;
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 13px;
}
.who a { text-underline-offset: 2px; }
.who { flex-wrap: wrap; overflow-wrap: anywhere; }
.study-note {
  margin-top: 16px;
  padding: 14px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 13px;
  line-height: 1.5;
}
.study-note p { margin: 8px 0 0; }
.sources { margin: 8px 0 0; padding-left: 18px; overflow-wrap: anywhere; }
.sources a { text-underline-offset: 2px; }
.section-note { margin: 0 0 10px; color: var(--muted); font-size: 13px; line-height: 1.5; }
.evidence {
  display: inline-block;
  align-self: flex-start;
  width: fit-content;
  font-size: 11px;
  font-style: normal;
  font-weight: 500;
  line-height: 1.5;
  color: var(--ink);
  background: var(--page);
  padding: 1px 5px;
  border-radius: 4px;
}
.meta { min-width: 0; }
.principles { margin: 0; padding: 0; list-style: none; }
.principles li {
  padding: 8px 0;
  border-top: 1px solid var(--line);
  line-height: 1.5;
}
.swatches {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.swatch {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  min-height: 64px;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  text-align: left;
}
.swatch i {
  width: 28px;
  height: 28px;
  flex: none;
  border-radius: 6px;
  border: 1px solid rgba(0, 0, 0, 0.08);
}
.swatch span { display: flex; flex-direction: column; min-width: 0; }
.swatch .evidence { margin-top: 3px; }
.swatch b { font-weight: 500; font-size: 13px; }
.swatch small {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.facts { margin: 0; }
.facts div {
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr);
  gap: 8px;
  padding: 7px 0;
  border-top: 1px solid var(--line);
  font-size: 14px;
}
.facts dt { color: var(--muted); }
.facts dd { margin: 0; overflow-wrap: anywhere; }
.codehead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.copy {
  min-height: 44px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  font-size: 13px;
}
pre.css {
  margin: 8px 0 0;
  padding: 12px 14px;
  overflow: auto;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.55;
}
.fine {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

#toast {
  position: fixed;
  left: 50%;
  bottom: 20px;
  translate: -50% 8px;
  padding: 8px 12px;
  border-radius: 8px;
  background: #1c1c1c;
  color: #fff;
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
}
#toast.show { opacity: 1; translate: -50% 0; }
@media (prefers-reduced-motion: no-preference) {
  #toast { transition: opacity 160ms linear, translate 160ms linear; }
}

@media (max-width: 800px) {
  .top {
    height: auto;
    flex-wrap: wrap;
    padding: 10px 16px;
  }
  .search {
    flex: 1 1 160px;
    max-width: none;
    margin-left: 0;
  }
  .sheet { grid-template-columns: 1fr; padding: 12px 16px 48px; }
  .grid { padding: 12px 16px 20px; }
  .filters { padding: 12px 16px 0; }
  .specimen { min-height: 0; }
  .swatches { grid-template-columns: 1fr; }
}