/* ==========================================================================
   Kardashev Community: unofficial companion site
   Dark technical theme: near-black, off-white, single amber accent.
   ========================================================================== */

@font-face {
  font-family: "Inter Tight";
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url("../fonts/inter-tight-latin-wght-normal.woff2") format("woff2-variations"),
       url("../fonts/inter-tight-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: "Inter Tight";
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url("../fonts/inter-tight-latin-ext-wght-normal.woff2") format("woff2-variations"),
       url("../fonts/inter-tight-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: "Inter Tight";
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url("../fonts/inter-tight-cyrillic-wght-normal.woff2") format("woff2-variations"),
       url("../fonts/inter-tight-cyrillic-wght-normal.woff2") format("woff2");
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-display: swap;
  font-weight: 400;
  src: url("../fonts/ibm-plex-mono-latin-400-normal.woff2") format("woff2");
}
@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-display: swap;
  font-weight: 500;
  src: url("../fonts/ibm-plex-mono-latin-500-normal.woff2") format("woff2");
}
/* Anybody (OFL) has a width axis: used for the gravity-squeezed wordmarks */
@font-face {
  font-family: "Anybody";
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  font-stretch: 50% 150%;
  src: url("../fonts/anybody-wdth-wght.woff2") format("woff2");
}
/* Caveat (OFL): a few hand-written ink annotations on the Black Hole page */
@font-face {
  font-family: "Caveat";
  font-style: normal;
  font-display: swap;
  font-weight: 500;
  src: url("../fonts/caveat-500.woff2") format("woff2");
}

:root {
  color-scheme: dark;

  --bg: #0b0b0c;
  --bg-raise: #111113;
  --bg-sunken: #08080a;
  --line: rgba(236, 233, 226, 0.09);
  --line-strong: rgba(236, 233, 226, 0.2);
  --fg: #ece9e2;
  --fg-muted: #a3a097;
  --fg-dim: #7f7d77;
  --accent: #7fd1e3;
  --accent-soft: rgba(127, 209, 227, 0.12);
  --accent-line: rgba(127, 209, 227, 0.42);
  --ok: #8fd19e;

  --font-sans: "Inter Tight", "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI",
    Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas,
    "Liberation Mono", monospace;
  --font-display: "Anybody", "Inter Tight", "Arial Narrow", "Helvetica Neue", Arial, sans-serif;
  --font-hand: "Caveat", "Segoe Print", "Bradley Hand", cursive;
  --star: rgba(236, 233, 226, 0.42);

  --maxw: 1240px;
  --gutter: clamp(16px, 4vw, 48px);
  --header-h: 64px;
  --radius: 2px;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur: 900ms;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 24px);
}

body {
  margin: 0;
  background-color: var(--bg);
  /* a sparse star field, after a photographic plate */
  background-image:
    radial-gradient(1.2px 1.2px at 12% 18%, var(--star) 50%, transparent 52%),
    radial-gradient(1px 1px at 63% 37%, var(--star) 50%, transparent 52%),
    radial-gradient(1.6px 1.6px at 81% 72%, var(--star) 50%, transparent 52%),
    radial-gradient(1px 1px at 33% 84%, var(--star) 50%, transparent 52%),
    radial-gradient(1px 1px at 47% 9%, var(--star) 50%, transparent 52%),
    radial-gradient(1.8px 1.8px at 91% 21%, var(--star) 50%, transparent 52%),
    radial-gradient(1px 1px at 7% 61%, var(--star) 50%, transparent 52%);
  background-size: 410px 370px, 290px 310px, 560px 520px, 230px 270px, 350px 330px, 770px 690px, 190px 210px;
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.6;
  font-feature-settings: "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
  text-decoration-color: var(--accent-line);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
  transition: color 200ms ease, text-decoration-color 200ms ease;
}
a:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius);
}

::selection {
  background: var(--accent);
  color: #0b0b0c;
}

sup {
  font-size: 0.62em;
  line-height: 0;
  vertical-align: 0.6em;
  margin-left: 0.04em;
}

p {
  margin: 0 0 1em;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.08;
  text-wrap: balance;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -100px;
  z-index: 100;
  padding: 10px 14px;
  background: var(--accent);
  color: #0b0b0c;
  font: 500 13px/1 var(--font-mono);
  text-decoration: none;
  letter-spacing: 0.04em;
}
.skip-link:focus {
  top: 12px;
  color: #0b0b0c;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: max(var(--gutter), env(safe-area-inset-left, 0px));
  padding-right: max(var(--gutter), env(safe-area-inset-right, 0px));
}

/* ---------- Typography helpers ---------- */

.mono {
  font-family: var(--font-mono);
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 20px;
  font: 500 12px/1.4 var(--font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.eyebrow .idx {
  color: var(--accent);
}
.eyebrow::after {
  content: "";
  flex: 0 0 40px;
  height: 1px;
  background: var(--line-strong);
}

.display {
  font-size: clamp(2.6rem, 7.4vw, 6.4rem);
  font-weight: 450;
  letter-spacing: -0.045em;
  line-height: 0.98;
}
.display em {
  font-style: normal;
  color: var(--accent);
}

.h2 {
  font-size: clamp(1.9rem, 4vw, 3.2rem);
  letter-spacing: -0.035em;
  line-height: 1.04;
}

.h3 {
  font-size: clamp(1.25rem, 2vw, 1.55rem);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.lede {
  font-size: clamp(1.1rem, 1.6vw, 1.32rem);
  line-height: 1.55;
  color: var(--fg-muted);
  max-width: 44ch;
}
.lede strong {
  color: var(--fg);
  font-weight: 500;
}

.prose {
  max-width: 66ch;
  color: var(--fg-muted);
}
.prose strong,
.prose b {
  color: var(--fg);
  font-weight: 500;
}
.prose h3 {
  color: var(--fg);
  margin: 2.2em 0 0.7em;
}
.prose h3:first-child {
  margin-top: 0;
}
.prose ul {
  padding-left: 1.1em;
  margin: 0 0 1em;
}
.prose li {
  margin-bottom: 0.45em;
}
.prose li::marker {
  color: var(--accent);
}
.prose cite,
.cite {
  font-style: italic;
  color: var(--fg);
}

.muted {
  color: var(--fg-muted);
}
.dim {
  color: var(--fg-dim);
}
.accent {
  color: var(--accent);
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 50;
  height: var(--header-h);
  background: rgba(11, 11, 12, 0.78);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.site-header .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--fg);
  font: 500 13px/1 var(--font-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  white-space: nowrap;
}
.brand:hover {
  color: var(--fg);
}
.brand-mark {
  width: 26px;
  height: 26px;
  flex: none;
}
.brand-mark circle {
  transition: stroke 300ms ease;
}
.brand:hover .brand-mark .ring-outer {
  stroke: var(--accent);
}
.brand-sub {
  color: var(--fg-dim);
  letter-spacing: 0.1em;
}

.nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 4px;
}
.nav a {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 12px;
  font: 500 12.5px/1 var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--fg-muted);
}
.nav a .n {
  color: var(--fg-dim);
  font-size: 11px;
}
.nav a::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 400ms var(--ease-out);
}
.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--fg);
}
.nav a:hover::after,
.nav a[aria-current="page"]::after {
  transform: scaleX(1);
}
.nav a[aria-current="page"] .n {
  color: var(--accent);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 0 10px 12px;
  background: none;
  border: 0;
  color: var(--fg);
  font: 500 12px/1 var(--font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
}
.nav-toggle .bars {
  position: relative;
  width: 18px;
  height: 10px;
}
.nav-toggle .bars::before,
.nav-toggle .bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: currentColor;
  transition: transform 300ms var(--ease-out), top 300ms var(--ease-out);
}
.nav-toggle .bars::before {
  top: 0;
}
.nav-toggle .bars::after {
  top: 9px;
}
.nav-toggle[aria-expanded="true"] .bars::before {
  top: 4.5px;
  transform: rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .bars::after {
  top: 4.5px;
  transform: rotate(-45deg);
}

@media (max-width: 1080px) {
  .nav-toggle {
    display: inline-flex;
  }
  .nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line-strong);
    box-shadow: 0 24px 48px -16px rgba(0, 0, 0, 0.8);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity 250ms ease, transform 250ms var(--ease-out), visibility 0s linear 250ms;
  }
  .nav.is-open {
    visibility: visible;
    opacity: 1;
    transform: none;
    transition: opacity 250ms ease, transform 250ms var(--ease-out);
  }
  .nav ul {
    flex-direction: column;
    gap: 0;
    padding: 8px var(--gutter) 20px;
  }
  .nav li + li {
    border-top: 1px solid var(--line);
  }
  .nav a {
    display: flex;
    padding: 18px 0;
    font-size: 14px;
  }
  .nav a::after {
    left: 0;
    right: auto;
    width: 40px;
    bottom: 10px;
  }
  .brand-sub {
    display: none;
  }
  html:not(.js) .nav-toggle {
    display: none;
  }
  html:not(.js) .site-header {
    position: static;
    height: auto;
  }
  html:not(.js) .site-header .container {
    flex-wrap: wrap;
    height: auto;
    padding-top: 12px;
    padding-bottom: 12px;
  }
  html:not(.js) .nav {
    position: static;
    width: 100%;
    visibility: visible;
    opacity: 1;
    transform: none;
    background: none;
    border: 0;
    box-shadow: none;
  }
  html:not(.js) .nav ul {
    flex-direction: row;
    flex-wrap: wrap;
    padding: 0;
  }
  html:not(.js) .nav li + li {
    border-top: 0;
  }
  html:not(.js) .nav a {
    padding: 10px 12px 10px 0;
  }
}

/* ---------- Sections & layout ---------- */

main {
  display: block;
}

.section {
  position: relative;
  padding: clamp(72px, 11vw, 148px) 0;
  border-top: 1px solid var(--line);
}
.section--tight {
  padding: clamp(56px, 7vw, 96px) 0;
}
.section--flush-top {
  border-top: 0;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: clamp(28px, 5vw, 80px);
  align-items: start;
}
.split > .split-aside {
  position: sticky;
  top: calc(var(--header-h) + 32px);
}
@media (max-width: 860px) {
  .split {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 0;
  }
  .split > .split-aside {
    position: static;
  }
  .split-aside > :not(.eyebrow):last-child {
    margin-bottom: 28px;
  }
}

.grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
@media (max-width: 860px) {
  .grid-3 {
    grid-template-columns: minmax(0, 1fr);
  }
}
@media (max-width: 640px) {
  .grid-2 {
    grid-template-columns: minmax(0, 1fr);
  }
}
.grid > * {
  background: var(--bg);
}

.stack > * + * {
  margin-top: 24px;
}

/* ---------- Hero ---------- */

.hero {
  position: relative;
  padding: clamp(64px, 11vw, 150px) 0 clamp(56px, 8vw, 110px);
  overflow: hidden;
  isolation: isolate;
}
.hero::before {
  /* faint measurement grid */
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 80px 80px;
  background-position: center top;
  -webkit-mask-image: radial-gradient(ellipse 70% 70% at 70% 40%, #000 0%, transparent 75%);
  mask-image: radial-gradient(ellipse 70% 70% at 70% 40%, #000 0%, transparent 75%);
  opacity: 0.6;
}
.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
}
@media (max-width: 960px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
  }
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 0 0 32px;
  padding: 0;
  list-style: none;
  font: 500 12px/1.4 var(--font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-dim);
}
.hero-meta li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.hero-meta li::before {
  content: "";
  width: 5px;
  height: 5px;
  background: var(--fg-dim);
  border-radius: 50%;
}
.hero-meta li.is-accent {
  color: var(--accent);
}
.hero-meta li.is-accent::before {
  background: var(--accent);
}
.hero .display {
  margin-bottom: 28px;
}
.hero .lede {
  margin-bottom: 40px;
}
.hero-visual {
  position: relative;
  aspect-ratio: 1;
  width: 100%;
  max-width: 520px;
  justify-self: center;
}
@media (max-width: 960px) {
  .hero-visual {
    max-width: 320px;
    margin-top: 8px;
  }
}

.page-hero {
  padding: clamp(64px, 10vw, 136px) 0 clamp(48px, 7vw, 88px);
  position: relative;
  overflow: hidden;
}
.page-hero .display {
  font-size: clamp(2.4rem, 6.4vw, 5.4rem);
  margin-bottom: 28px;
  max-width: 16ch;
}
.page-hero .lede {
  max-width: 52ch;
}

/* Orbit diagram (hero) */
.orbits {
  width: 100%;
  height: 100%;
  overflow: visible;
}
.orbits .ring {
  fill: none;
  stroke: var(--line-strong);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}
.orbits .ring--accent {
  stroke: var(--accent-line);
}
.orbits .tick {
  stroke: var(--fg-dim);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}
.orbits .label {
  font: 500 11px var(--font-mono);
  letter-spacing: 0.12em;
  fill: var(--fg-dim);
  text-transform: uppercase;
}
.orbits .label--accent {
  fill: var(--accent);
}
.orbits .label {
  paint-order: stroke;
  stroke: var(--bg);
  stroke-width: 6px;
  stroke-linejoin: round;
}
@media (max-width: 960px) {
  .orbits .label {
    font-size: 17px;
  }
}
.orbits .core {
  fill: var(--accent);
}
.orbits .spin {
  transform-box: view-box;
  transform-origin: 50% 50%;
  animation: spin 80s linear infinite;
}
.orbits .spin--slow {
  animation-duration: 140s;
  animation-direction: reverse;
}
.orbits .spin--fast {
  animation-duration: 40s;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ---------- Line draw ---------- */

.js [data-draw] path,
.js [data-draw] circle,
.js [data-draw] line,
.js [data-draw] polyline {
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  transition: stroke-dashoffset 2200ms var(--ease-out);
}
.js [data-draw].is-in path,
.js [data-draw].is-in circle,
.js [data-draw].is-in line,
.js [data-draw].is-in polyline {
  stroke-dashoffset: 0;
}
.js [data-draw] :nth-child(2) {
  transition-delay: 150ms;
}
.js [data-draw] :nth-child(3) {
  transition-delay: 300ms;
}
.js [data-draw] :nth-child(4) {
  transition-delay: 450ms;
}
.js [data-draw] :nth-child(5) {
  transition-delay: 600ms;
}

.rule {
  height: 1px;
  background: var(--line-strong);
  border: 0;
  margin: 0;
  transform-origin: left;
}
.js .rule.reveal {
  transform: scaleX(0);
  opacity: 1;
  transition: transform 1400ms var(--ease-out);
}
.js .rule.reveal.is-in {
  transform: scaleX(1);
}

/* ---------- Reveal ---------- */
/* Content is always visible at rest; scrolling into view only settles it into place. */

.js .reveal {
  transform: translateY(16px);
  transition: transform var(--dur) var(--ease-out);
  transition-delay: var(--d, 0ms);
}
.js .reveal.is-in {
  transform: none;
}
.js .grid > .reveal {
  transform: none;
}
.js .grid > .reveal > * {
  transform: translateY(16px);
  transition: transform var(--dur) var(--ease-out);
  transition-delay: var(--d, 0ms);
}
.js .grid > .reveal.is-in > * {
  transform: none;
}

/* ---------- Buttons & links ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--fg);
  font: 500 12.5px/1 var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  border-radius: var(--radius);
  transition: border-color 200ms ease, background 200ms ease, color 200ms ease;
}
.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.btn--solid {
  background: var(--fg);
  border-color: var(--fg);
  color: #0b0b0c;
}
.btn--solid:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #0b0b0c;
}
.btn .arrow {
  transition: transform 300ms var(--ease-out);
}
.btn:hover .arrow {
  transform: translateX(4px);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font: 500 12.5px/1.4 var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--fg);
}
.text-link .arrow {
  color: var(--accent);
  transition: transform 300ms var(--ease-out);
}
.text-link:hover .arrow {
  transform: translateX(4px);
}

.ext::after {
  content: "\2197";
  content: "\2197" / " (opens in a new tab)";
  display: inline-block;
  margin-left: 0.3em;
  font-size: 0.85em;
  color: var(--accent);
  text-decoration: none;
}

/* ---------- Contract address block ---------- */

.ca {
  position: relative;
  border: 1px solid var(--line-strong);
  background: linear-gradient(180deg, rgba(236, 233, 226, 0.03), rgba(236, 233, 226, 0));
  padding: 18px 18px 16px;
  max-width: 640px;
}
.ca::before,
.ca::after {
  /* corner marks */
  content: "";
  position: absolute;
  width: 10px;
  height: 10px;
  border-color: var(--accent);
  border-style: solid;
}
.ca::before {
  top: -1px;
  left: -1px;
  border-width: 1px 0 0 1px;
}
.ca::after {
  bottom: -1px;
  right: -1px;
  border-width: 0 1px 1px 0;
}
.ca-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 12px;
  font: 500 11.5px/1.4 var(--font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.ca-head .chain {
  color: var(--fg-dim);
}
.ca-body {
  display: flex;
  align-items: stretch;
  gap: 12px;
}
@media (max-width: 560px) {
  .ca-body {
    flex-direction: column;
  }
}
.ca-value {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  align-items: center;
  padding: 12px 14px;
  background: var(--bg-sunken);
  border: 1px solid var(--line);
  font: 400 clamp(13px, 1.5vw, 15px)/1.45 var(--font-mono);
  letter-spacing: 0.02em;
  color: var(--fg);
  word-break: break-all;
  overflow-wrap: anywhere;
  user-select: all;
  -webkit-user-select: all;
}
.btn-copy {
  flex: none;
  min-width: 112px;
  position: relative;
}
.btn-copy .icon {
  width: 14px;
  height: 14px;
}
.btn-copy .state-idle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.btn-copy .state-done {
  display: none;
}
.btn-copy.is-copied {
  border-color: var(--ok);
  color: var(--ok);
}
.btn-copy.is-copied .state-idle {
  display: none;
}
.btn-copy.is-copied .state-done {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.btn-copy.is-failed {
  border-color: var(--accent);
  color: var(--accent);
}
.ca-foot {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 16px;
  margin-top: 6px;
  font: 400 12px/1.5 var(--font-mono);
  color: var(--fg-dim);
}
.ca-foot a {
  color: var(--fg-muted);
}
.ca-status {
  margin: 8px 0 0;
  min-height: 18px;
  font: 400 12px/1.5 var(--font-mono);
  color: var(--ok);
}
.ca-status.is-error {
  color: var(--accent);
}

/* ---------- Spec table (key / value) ---------- */

.spec {
  margin: 0;
  border-top: 1px solid var(--line-strong);
}
.spec > div {
  display: grid;
  grid-template-columns: minmax(120px, 0.38fr) minmax(0, 1fr);
  align-items: baseline;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}
@media (max-width: 560px) {
  .spec > div {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }
}
.spec dt {
  font: 500 12px/1.6 var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-dim);
}
.spec dd {
  margin: 0;
  color: var(--fg);
  overflow-wrap: anywhere;
}
.spec dd .mono {
  font-size: 0.9em;
}
.spec dd.muted {
  color: var(--fg-muted);
}

/* ---------- Cards ---------- */

.card {
  position: relative;
  padding: clamp(24px, 3vw, 36px);
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 100%;
}
.card .idx {
  font: 500 12px/1 var(--font-mono);
  letter-spacing: 0.12em;
  color: var(--accent);
}
.card p {
  color: var(--fg-muted);
  margin: 0;
}
.card .text-link {
  margin-top: auto;
  padding-top: 12px;
}

.link-card {
  text-decoration: none;
  color: var(--fg);
  transition: background 300ms ease;
}
.link-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  height: 1px;
  width: 100%;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 600ms var(--ease-out);
}
.link-card:hover {
  background: var(--bg-raise);
  color: var(--fg);
}
.link-card:hover::before,
.link-card:focus-visible::before {
  transform: scaleX(1);
}
.link-card:hover .arrow {
  transform: translateX(4px);
}

/* ---------- Callouts ---------- */

.note {
  display: flex;
  gap: 14px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--accent);
  background: var(--bg-raise);
  color: var(--fg-muted);
  font-size: 15px;
  line-height: 1.55;
}
.note .tag {
  flex: none;
  font: 500 11px/1.9 var(--font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}
.note p:last-child {
  margin: 0;
}
@media (max-width: 560px) {
  .note {
    flex-direction: column;
    gap: 6px;
  }
}

.disclaimer-band {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--bg-sunken);
  padding: 28px 0;
}
.disclaimer-band .container {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px 32px;
  align-items: baseline;
}
@media (max-width: 700px) {
  .disclaimer-band .container {
    grid-template-columns: minmax(0, 1fr);
  }
}
.disclaimer-band .tag {
  font: 500 12px/1.6 var(--font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}
.disclaimer-band p {
  margin: 0;
  color: var(--fg-muted);
  font-size: 15px;
  max-width: 90ch;
}

/* ---------- Tabs (scale explorer) ---------- */

.explorer {
  border: 1px solid var(--line-strong);
  background: var(--bg);
}
.tablist {
  position: relative;
  display: flex;
  overflow-x: auto;
  scrollbar-width: none;
  border-bottom: 1px solid var(--line-strong);
}
.tablist::-webkit-scrollbar {
  display: none;
}
.tab {
  position: relative;
  flex: 1 0 auto;
  min-width: 108px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  padding: 18px 20px 16px;
  background: transparent;
  border: 0;
  border-right: 1px solid var(--line);
  color: var(--fg-muted);
  text-align: left;
  cursor: pointer;
  transition: background 200ms ease, color 200ms ease;
}
.tab:last-child {
  border-right: 0;
}
.tab .t-kicker {
  font: 500 10.5px/1 var(--font-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-dim);
}
.tab .t-name {
  font: 500 18px/1.1 var(--font-sans);
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.tab::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 450ms var(--ease-out);
}
.tab:hover {
  background: var(--bg-raise);
  color: var(--fg);
}
.tab[aria-selected="true"] {
  color: var(--fg);
  background: var(--bg-raise);
}
.tab[aria-selected="true"] .t-kicker {
  color: var(--accent);
}
.tab[aria-selected="true"]::after {
  transform: scaleX(1);
}
.tab:focus-visible {
  outline-offset: -3px;
}

.tabpanel {
  padding: clamp(24px, 4vw, 48px);
}
.tabpanel[hidden],
.js .tabpanel[data-start-hidden] {
  display: none;
}
html:not(.js) .tablist {
  display: none;
}
html:not(.js) .tabpanel + .tabpanel {
  border-top: 1px solid var(--line-strong);
}
.js .tabpanel.is-entering {
  animation: panel-in 600ms var(--ease-out);
}
@keyframes panel-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}
.panel-grid {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(24px, 4vw, 56px);
}
@media (max-width: 860px) {
  .panel-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}
.panel-grid h3 {
  margin-bottom: 16px;
}
.panel-grid .prose p {
  font-size: 16px;
}

.magnitude {
  border: 1px solid var(--line);
  background: var(--bg-sunken);
  padding: 20px;
}
.magnitude .m-label {
  font: 500 11px/1.4 var(--font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-dim);
  margin-bottom: 6px;
}
.magnitude .m-value {
  font: 400 clamp(1.6rem, 3vw, 2.2rem)/1.1 var(--font-sans);
  letter-spacing: -0.02em;
  color: var(--fg);
}
.magnitude .m-value .unit {
  font-size: 0.55em;
  color: var(--fg-muted);
  margin-left: 0.25em;
}
.magnitude .m-row + .m-row {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}
.magnitude .m-sub {
  font-size: 14px;
  color: var(--fg-muted);
  margin-top: 6px;
  line-height: 1.5;
}

/* ---------- Energy slider ---------- */

.energy {
  border: 1px solid var(--line-strong);
  padding: clamp(20px, 4vw, 44px);
  background:
    radial-gradient(ellipse 60% 120% at 100% 0%, var(--accent-soft), transparent 60%),
    var(--bg);
}
.energy-readout {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-bottom: 32px;
}
@media (max-width: 760px) {
  .energy-readout {
    grid-template-columns: minmax(0, 1fr);
  }
}
.energy-readout > div {
  background: var(--bg);
  padding: 18px 20px;
  min-width: 0;
}
.energy-readout .r-label {
  font: 500 11px/1.4 var(--font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-dim);
  margin-bottom: 8px;
}
.energy-readout .r-value {
  font: 400 clamp(1.5rem, 3.2vw, 2.3rem)/1.1 var(--font-sans);
  letter-spacing: -0.025em;
  font-variant-numeric: tabular-nums;
  color: var(--fg);
  overflow-wrap: anywhere;
}
.energy-readout .r-value.is-accent {
  color: var(--accent);
}
.energy-readout .r-value .unit {
  font-size: 0.55em;
  color: var(--fg-muted);
  margin-left: 0.25em;
}
.energy-readout .r-sub {
  margin-top: 8px;
  font-size: 13.5px;
  line-height: 1.45;
  color: var(--fg-muted);
}

.range-wrap {
  position: relative;
  padding: 34px 0 54px;
}
.range-label .dim {
  color: var(--fg-muted);
}
.range-label {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
  font: 500 12px/1.4 var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.range-field {
  position: relative;
}
.scale-track {
  position: absolute;
  top: 0;
  left: 11px;
  right: 11px;
  height: 44px;
  pointer-events: none;
}
.scale-track .mark {
  position: absolute;
  top: 8px;
  width: 1px;
  height: 14px;
  background: var(--line-strong);
}
.scale-track .mark.is-minor {
  top: 15px;
  height: 7px;
  background: var(--line);
}
.scale-track .mark.is-type {
  background: var(--accent-line);
  top: 4px;
  height: 18px;
}
.scale-track .mark span {
  position: absolute;
  top: 34px;
  left: 0;
  transform: translateX(-50%);
  font: 500 10.5px/1 var(--font-mono);
  letter-spacing: 0.1em;
  color: var(--fg-dim);
  white-space: nowrap;
}
.scale-track .mark.is-type span {
  color: var(--accent);
}
@media (max-width: 560px) {
  .scale-track .mark:not(.is-type) span {
    display: none;
  }
}

input[type="range"].energy-range {
  -webkit-appearance: none;
  appearance: none;
  position: relative;
  z-index: 1;
  width: 100%;
  height: 44px;
  margin: 0;
  background: transparent;
  cursor: pointer;
  --pct: 33%;
}
input[type="range"].energy-range::-webkit-slider-runnable-track {
  height: 2px;
  background: linear-gradient(90deg, var(--accent) 0 var(--pct), var(--line-strong) var(--pct) 100%);
}
input[type="range"].energy-range::-moz-range-track {
  height: 2px;
  background: var(--line-strong);
}
input[type="range"].energy-range::-moz-range-progress {
  height: 2px;
  background: var(--accent);
}
input[type="range"].energy-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  margin-top: -10px;
  border-radius: 50%;
  background: var(--bg);
  border: 1px solid var(--accent);
  box-shadow: 0 0 0 5px var(--accent-soft), inset 0 0 0 4px var(--bg), inset 0 0 0 11px var(--accent);
  transition: box-shadow 200ms ease;
}
input[type="range"].energy-range::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent);
  border: 4px solid var(--bg);
  box-shadow: 0 0 0 1px var(--accent), 0 0 0 6px var(--accent-soft);
}
input[type="range"].energy-range:focus-visible {
  outline: none;
}
input[type="range"].energy-range:focus-visible::-webkit-slider-thumb {
  box-shadow: 0 0 0 3px var(--bg), 0 0 0 5px var(--accent), inset 0 0 0 4px var(--bg), inset 0 0 0 11px var(--accent);
}
input[type="range"].energy-range:focus-visible::-moz-range-thumb {
  box-shadow: 0 0 0 3px var(--bg), 0 0 0 5px var(--accent);
}

.anchors {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
}
.anchor-btn {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  min-height: 36px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--fg-muted);
  font: 400 13px/1.3 var(--font-sans);
  text-align: left;
  cursor: pointer;
  border-radius: var(--radius);
  transition: border-color 200ms ease, color 200ms ease, background 200ms ease;
}
.anchor-btn .p {
  font: 500 11px/1 var(--font-mono);
  color: var(--fg-dim);
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.anchor-btn:hover {
  border-color: var(--line-strong);
  color: var(--fg);
}
.anchor-btn[aria-current] {
  border-color: var(--accent);
  color: var(--fg);
  background: var(--accent-soft);
}
.anchor-btn[aria-current] .p {
  color: var(--accent);
}

.anchor-btn .p sup,
.scale-track sup,
.range-label sup {
  font-size: 0.8em;
  vertical-align: 0.45em;
}

/* ---------- Comparison table ---------- */

.table-wrap {
  position: relative; /* keeps visually hidden text inside the scroll box */
  overflow-x: auto;
  border: 1px solid var(--line);
}
.table {
  width: 100%;
  border-collapse: collapse;
  min-width: 620px;
  font-size: 15px;
}
.table th,
.table td {
  padding: 16px 18px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}
.table thead th {
  font: 500 11.5px/1.4 var(--font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-dim);
  background: var(--bg-raise);
}
.table tbody th {
  font-weight: 500;
  color: var(--fg);
  white-space: nowrap;
}
.table td {
  color: var(--fg-muted);
}
.table tr:last-child th,
.table tr:last-child td {
  border-bottom: 0;
}
.table tbody tr {
  transition: background 200ms ease;
}
.table tbody tr:hover {
  background: var(--bg-raise);
}
@media (max-width: 640px) {
  .table--fit {
    min-width: 0;
  }
  .table--fit tbody th {
    white-space: normal;
  }
  .table th,
  .table td {
    padding: 12px 14px;
  }
}

/* ---------- Timeline ---------- */

.timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 0;
  --progress: 0;
}
.timeline::before,
.timeline::after {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 112px;
  width: 1px;
  background: var(--line-strong);
}
.timeline::after {
  background: var(--accent);
  transform-origin: top;
  transform: scaleY(var(--progress));
}
html:not(.js) .timeline::after {
  display: none;
}
.timeline li {
  position: relative;
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr);
  gap: 0;
  padding: 0 0 40px;
}
.timeline li:last-child {
  padding-bottom: 0;
}
.timeline .year {
  padding-right: 28px;
  font: 500 14px/1.6 var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--accent);
  text-align: right;
}
.timeline .event {
  position: relative;
  padding-left: 32px;
  color: var(--fg-muted);
}
.timeline .event::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg);
  border: 1px solid var(--accent);
}
.timeline .event strong {
  display: block;
  color: var(--fg);
  font-weight: 500;
  margin-bottom: 4px;
}
@media (max-width: 560px) {
  .timeline::before,
  .timeline::after {
    left: 4px;
  }
  .timeline li {
    grid-template-columns: minmax(0, 1fr);
    padding-left: 28px;
  }
  .timeline .year {
    text-align: left;
    padding: 0 0 4px;
  }
  .timeline .event {
    padding-left: 0;
  }
  .timeline .event::before {
    left: -28px;
    top: -21px;
  }
}

/* ---------- Portrait-free figure (name plate) ---------- */

.plate {
  border: 1px solid var(--line-strong);
  padding: 24px;
  background: var(--bg-raise);
}
.plate .ru {
  font-size: 1.15rem;
  color: var(--fg);
  margin-bottom: 4px;
}
.plate .dates {
  font: 500 13px/1.5 var(--font-mono);
  color: var(--accent);
  letter-spacing: 0.06em;
}

/* ---------- Sources ---------- */

.sources {
  counter-reset: src;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 14.5px;
  color: var(--fg-muted);
}
.sources li {
  counter-increment: src;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  overflow-wrap: anywhere;
}
.sources li::before {
  content: "[" counter(src, decimal-leading-zero) "]";
  font: 500 12px/1.9 var(--font-mono);
  color: var(--fg-dim);
}

/* ---------- Big statement ---------- */

.statement {
  font-size: clamp(1.6rem, 3.6vw, 2.9rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
  font-weight: 400;
  max-width: 26ch;
  color: var(--fg);
}
.statement .muted {
  color: var(--fg-dim);
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  padding: 56px 0 40px;
  color: var(--fg-muted);
  font-size: 14px;
}
.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 6fr) minmax(0, 3fr) minmax(0, 3fr);
  gap: 32px;
}
@media (max-width: 860px) {
  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}
.footer-title {
  font: 500 11.5px/1.4 var(--font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-dim);
  margin: 0 0 14px;
}
.footer-grid ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.footer-grid li + li {
  margin-top: 8px;
}
.footer-grid a {
  text-decoration: none;
  color: var(--fg-muted);
}
.footer-grid a:hover {
  color: var(--accent);
}
.footer-legal {
  max-width: 62ch;
  line-height: 1.6;
}
.footer-legal strong {
  color: var(--fg);
  font-weight: 500;
}
.footer-legal a {
  color: var(--fg);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--accent-line);
}
.footer-base {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  font: 400 12px/1.6 var(--font-mono);
  color: var(--fg-dim);
  overflow-wrap: anywhere;
}

/* ---------- Toast (copy feedback for screen readers is inline; this is visual only) ---------- */

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  z-index: 80;
  transform: translate(-50%, 16px);
  opacity: 0;
  pointer-events: none;
  padding: 12px 16px;
  background: var(--fg);
  color: #0b0b0c;
  font: 500 12.5px/1 var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: opacity 250ms ease, transform 350ms var(--ease-out);
}
.toast.is-on {
  opacity: 1;
  transform: translate(-50%, 0);
}

/* ---------- Gravity-squeezed wordmark ---------- */

.wordmark {
  display: flex;
  flex-wrap: nowrap;
  align-items: flex-end;
  max-width: 100%;
  margin: 0;
  overflow: hidden;
  font-family: var(--font-display);
  font-weight: 820;
  font-size: clamp(3rem, 12vw, 10.4rem);
  line-height: 0.86;
  letter-spacing: -0.01em;
  text-transform: uppercase;
  color: var(--fg);
}
.wordmark span {
  display: inline-block;
  font-variation-settings: "wdth" var(--w, 100);
  transform: translateY(var(--dy, 0));
}
.wordmark span.gap {
  width: 0.18em;
}
.js .wordmark.reveal span {
  transition: font-variation-settings 1600ms var(--ease-out);
}
.js .wordmark.reveal:not(.is-in) span {
  font-variation-settings: "wdth" 100;
}
.wordmark.is-measuring span {
  font-variation-settings: "wdth" var(--w, 100) !important;
  transition: none !important;
}
.wordmark--sm {
  font-size: clamp(2.4rem, 8vw, 6rem);
}

/* ---------- Plate label (sleeve) ---------- */

.plate-label {
  display: inline-grid;
  grid-template-columns: repeat(4, auto);
  margin: 0;
  border: 1px solid var(--line-strong);
  font: 500 12px/1.3 var(--font-mono);
  max-width: 100%;
}
.plate-label > div {
  min-width: 0;
  padding: 8px 14px 9px;
  border-left: 1px solid var(--line-strong);
}
.plate-label > div:first-child {
  border-left: 0;
}
.plate-label dt {
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-dim);
}
.plate-label dd {
  margin: 3px 0 0;
  color: var(--fg);
  letter-spacing: 0.02em;
  overflow-wrap: anywhere;
}
.plate-label dd.is-accent {
  color: var(--accent);
}
@media (max-width: 640px) {
  .plate-label {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    display: grid;
  }
  .plate-label > div:nth-child(3) {
    border-left: 0;
  }
  .plate-label > div:nth-child(n + 3) {
    border-top: 1px solid var(--line-strong);
  }
}

/* ---------- Numbered steps ---------- */

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 32px;
  counter-reset: step;
}
.steps li {
  counter-increment: step;
  min-width: 0;
  color: var(--fg-muted);
}
.steps li::before {
  content: counter(step, decimal-leading-zero);
  display: block;
  margin-bottom: 14px;
  font: 800 3.6rem/0.9 var(--font-display);
  font-variation-settings: "wdth" 60;
  color: var(--accent);
}
.steps b {
  color: var(--fg);
  font-weight: 500;
}
@media (max-width: 860px) {
  .steps {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
  }
  .steps li {
    display: grid;
    grid-template-columns: 64px minmax(0, 1fr);
    align-items: start;
  }
  .steps li::before {
    margin: 0;
  }
}

/* ---------- Terms with timing annotations ---------- */

.terms {
  margin: 0;
}
.terms > div {
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.terms > div:first-child {
  border-top: 1px solid var(--line-strong);
}
.terms dt {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--fg);
}
.terms dt small {
  font: 500 11px/1 var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}
.terms dd {
  margin: 6px 0 0;
  color: var(--fg-muted);
}

/* ---------- Keys ---------- */

kbd {
  display: inline-block;
  padding: 3px 7px 4px;
  border: 1px solid var(--line-strong);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: var(--bg-raise);
  color: var(--fg);
  font: 500 0.78em/1 var(--font-mono);
  white-space: nowrap;
  vertical-align: 0.08em;
}
code {
  font: 500 0.86em/1 var(--font-mono);
  background: var(--bg-raise);
  border: 1px solid var(--line);
  padding: 2px 5px;
  border-radius: 3px;
}

/* ---------- FAQ (details) ---------- */

.faq details {
  border-bottom: 1px solid var(--line);
  padding: 0;
  max-width: 72ch;
}
.faq details:first-of-type {
  border-top: 1px solid var(--line-strong);
}
.faq summary {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  font-weight: 500;
  font-size: 1.08rem;
  color: var(--fg);
  transition: color 200ms ease;
}
.faq summary::-webkit-details-marker {
  display: none;
}
.faq summary::after {
  content: "+";
  flex: none;
  font: 500 1.2rem/1 var(--font-mono);
  color: var(--accent);
}
.faq details[open] summary::after {
  content: "\2212";
}
.faq summary:hover {
  color: var(--accent);
}
.faq details > div {
  padding: 0 0 20px;
  color: var(--fg-muted);
  max-width: 64ch;
}
.faq details > div p:last-child {
  margin: 0;
}

/* ---------- Black-hole bullets ---------- */

.bh-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 48px;
}
@media (max-width: 760px) {
  .bh-list {
    grid-template-columns: minmax(0, 1fr);
  }
}
.bh-list li {
  position: relative;
  min-width: 0;
  padding-left: 26px;
  color: var(--fg-muted);
}
.bh-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background:
    radial-gradient(circle, #000 0 38%, transparent 44%),
    radial-gradient(circle, transparent 0 48%, var(--accent) 54% 68%, transparent 74%);
  box-shadow: 0 0 8px rgba(127, 209, 227, 0.3);
}
.bh-list b {
  color: var(--fg);
  font-weight: 500;
}

/* ---------- Pill CTA (feed button) + ink annotations ---------- */

.btn-feed {
  appearance: none;
  border: 0;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-height: 52px;
  padding: 0 26px 1px 20px;
  border-radius: 999px;
  background: var(--accent);
  color: #06181d;
  font: 650 1.05rem/1 var(--font-display);
  font-variation-settings: "wdth" 96;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.12) inset, 0 14px 36px -12px rgba(127, 209, 227, 0.55);
  transition: filter 200ms ease, transform 200ms ease, box-shadow 300ms ease;
}
.btn-feed:hover {
  filter: brightness(1.06) saturate(1.1);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.12) inset, 0 18px 44px -10px rgba(127, 209, 227, 0.75);
}
.btn-feed:active {
  transform: translateY(1px);
}
.btn-feed .bh {
  width: 20px;
  height: 20px;
  flex: none;
  border-radius: 50%;
  background: radial-gradient(circle, #000 0 43%, #fff1d2 47%, #ffb24f 57%, rgba(255, 90, 28, 0.6) 74%, transparent 76%);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.25);
}
.btn-feed:focus-visible {
  outline-offset: 4px;
  border-radius: 999px;
}

.switch {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--fg-muted);
  font: 500 12px/1 var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
}
.switch .dot {
  width: 26px;
  height: 14px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  position: relative;
  transition: background 200ms ease, border-color 200ms ease;
}
.switch .dot::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--fg-dim);
  transition: transform 250ms var(--ease-out), background 200ms ease;
}
.switch[aria-pressed="true"] {
  color: var(--fg);
}
.switch[aria-pressed="true"] .dot {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.switch[aria-pressed="true"] .dot::after {
  transform: translateX(12px);
  background: var(--accent);
}
.switch:hover {
  border-color: var(--accent);
}

.ink {
  font: 500 1.45rem/1.05 var(--font-hand);
  color: var(--accent);
}

/* ---------- Horizon figure ---------- */

.horizon {
  position: relative;
  margin: 0;
}
.horizon svg {
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: #030304;
}
.horizon .ink {
  position: absolute;
  left: 8%;
  bottom: 22%;
  transform: rotate(-5deg);
  max-width: 9em;
  color: #fff0d8;
  pointer-events: none;
}
.hz-labels {
  font-size: 16px;
  paint-order: stroke;
  stroke: #000;
  stroke-width: 4px;
}
.hz-labels .sub {
  font-size: 11px;
}
@media (max-width: 600px) {
  .hz-labels {
    font-size: 20px;
  }
}
@media (max-width: 960px) {
  .horizon {
    width: 100%;
    max-width: 440px;
    justify-self: center;
  }
}
.horizon figcaption,
.figure-caption {
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--fg-dim);
  max-width: 52ch;
}

.engine-status {
  font: 400 12.5px/1.5 var(--font-mono);
  color: var(--fg-dim);
  min-height: 1.5em;
}

/* ---------- Public record ---------- */

.records {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}
.record {
  display: grid;
  grid-template-columns: minmax(150px, 0.3fr) minmax(0, 1fr);
  gap: 12px 32px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}
.record[hidden] {
  display: none;
}
@media (max-width: 700px) {
  .record {
    grid-template-columns: minmax(0, 1fr);
  }
}
.record-meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font: 500 12px/1.4 var(--font-mono);
  letter-spacing: 0.06em;
}
.record-date {
  color: var(--accent);
}
.record-src a {
  color: var(--fg);
}
.record-kind {
  align-self: flex-start;
  padding: 3px 8px;
  border: 1px solid var(--line-strong);
  color: var(--fg-dim);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.record-body {
  min-width: 0;
  color: var(--fg-muted);
}
.record-body blockquote {
  margin: 0;
  padding-left: 20px;
  border-left: 2px solid var(--accent);
  color: var(--fg);
  font-size: clamp(1.1rem, 1.7vw, 1.3rem);
  line-height: 1.5;
  letter-spacing: -0.01em;
}
.record-body blockquote p {
  margin: 0;
}
.record-note,
.record-lead {
  margin: 12px 0 0;
  font-size: 15px;
}
.record-lead {
  margin-top: 0;
}
.record-lead b {
  color: var(--fg);
  font-weight: 500;
}
.record-list {
  margin: 14px 0 0;
  padding-left: 1.1em;
  font-size: 15.5px;
}
.record-list li {
  margin-bottom: 0.5em;
}
.record-list li::marker {
  color: var(--accent);
}

.filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}
.filter-btn {
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--fg-muted);
  font: 500 12px/1 var(--font-mono);
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: border-color 200ms ease, color 200ms ease, background 200ms ease;
}
.filter-btn:hover {
  border-color: var(--accent);
  color: var(--fg);
}
.filter-btn[aria-pressed="true"] {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--fg);
}
html:not(.js) .filter,
html:not(.js) #record-count,
html:not(.js) .btn-copy,
html:not(.js) [data-energy] .range-wrap,
html:not(.js) [data-energy] .anchors,
html:not(.js) [data-energy] #anchors-label,
html:not(.js) #feed,
html:not(.js) [data-feed],
html:not(.js) #sound {
  display: none;
}

/* ---------- Plain-language magnitude values ---------- */

.magnitude .m-value--words {
  font-size: clamp(1.2rem, 2vw, 1.45rem);
  line-height: 1.25;
}

/* ---------- Clickable orbit rings (home hero) ---------- */

.orbits .ring-hit {
  fill: none;
  stroke: transparent;
  stroke-width: 22px;
  pointer-events: stroke;
  cursor: pointer;
}
.orbits .orbit-link {
  outline: none;
}
.orbits .orbit-link .ring-hit {
  transition: stroke 250ms ease;
}
.orbits .orbit-link:hover .ring-hit,
.orbits .orbit-link:focus-visible .ring-hit {
  stroke: var(--accent-soft);
}
.orbits .orbit-link:hover .label,
.orbits .orbit-link:focus-visible .label {
  fill: var(--accent);
}
.orbits .orbit-link .label {
  cursor: pointer;
  transition: fill 200ms ease;
}

/* ---------- Mini horizon (home) ---------- */

.horizon--mini {
  max-width: 460px;
  justify-self: center;
  width: 100%;
}
.hz-breathe {
  transform-box: view-box;
  transform-origin: 50% 50%;
  animation: hz-breathe 6s ease-in-out infinite;
}
@keyframes hz-breathe {
  0%,
  100% {
    opacity: 0.88;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.02);
  }
}

/* ---------- Sorting quiz ---------- */

.quiz {
  border: 1px solid var(--line-strong);
}
.quiz-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
}
@media (max-width: 760px) {
  .quiz-list {
    grid-template-columns: minmax(0, 1fr);
  }
}
.quiz-item {
  background: var(--bg);
  padding: clamp(20px, 3vw, 32px);
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
  transition: background 300ms ease;
}
.quiz-item[data-state="right"] {
  background: linear-gradient(180deg, rgba(143, 209, 158, 0.06), var(--bg) 70%);
}
.quiz-item[data-state="wrong"] {
  background: linear-gradient(180deg, var(--accent-soft), var(--bg) 70%);
}
.quiz-q {
  margin: 0;
  color: var(--fg);
  font-size: 1.08rem;
  line-height: 1.45;
}
.quiz-n {
  display: block;
  margin-bottom: 8px;
  font: 500 12px/1 var(--font-mono);
  letter-spacing: 0.12em;
  color: var(--accent);
}
.quiz-opts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.quiz-opt {
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--fg-muted);
  font: 500 12px/1 var(--font-mono);
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: border-color 200ms ease, color 200ms ease, background 200ms ease;
}
.quiz-opt:hover {
  border-color: var(--accent);
  color: var(--fg);
}
.quiz-opt[aria-disabled="true"] {
  cursor: default;
}
.quiz-opt[aria-disabled="true"]:not(.is-answer):not(.is-wrong) {
  opacity: 0.45;
}
.quiz-opt.is-answer {
  border-color: var(--ok);
  color: var(--fg);
  background: rgba(143, 209, 158, 0.1);
}
.quiz-opt.is-wrong {
  border-color: var(--accent);
  color: var(--fg);
  text-decoration: line-through;
  text-decoration-color: var(--accent);
}
.quiz-why {
  margin: 0;
  min-height: 1.5em;
  font-size: 15px;
  line-height: 1.5;
  color: var(--fg-muted);
}
.quiz-item[data-state="right"] .quiz-verdict {
  color: var(--ok);
  font-weight: 500;
}
.quiz-item[data-state="wrong"] .quiz-verdict {
  color: var(--accent);
  font-weight: 500;
}
.quiz-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding: 18px clamp(20px, 3vw, 32px);
  border-top: 1px solid var(--line-strong);
  background: var(--bg-raise);
}
.quiz-score {
  margin: 0;
  font: 500 13px/1.4 var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--fg);
}
html:not(.js) .quiz-opts,
html:not(.js) .quiz-foot {
  display: none;
}
html:not(.js) .quiz-expl[hidden] {
  display: inline;
}

/* ---------- Black hole size picker ---------- */

.sizer {
  border: 1px solid var(--line-strong);
  padding: clamp(20px, 3vw, 36px);
  background: radial-gradient(ellipse 60% 80% at 30% 50%, rgba(255, 122, 26, 0.06), transparent 70%), var(--bg);
}
.sizer-picks {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}
.sizer-btn {
  min-height: 40px;
  padding: 0 16px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--fg-muted);
  font: 500 12.5px/1 var(--font-mono);
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: border-color 200ms ease, color 200ms ease, background 200ms ease;
}
.sizer-btn:hover {
  border-color: var(--accent);
  color: var(--fg);
}
.sizer-btn[aria-pressed="true"] {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--fg);
}
.sizer-stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(20px, 4vw, 56px);
  align-items: center;
}
@media (max-width: 760px) {
  .sizer-stage {
    grid-template-columns: minmax(0, 1fr);
  }
}
.sizer-view {
  position: relative;
  height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  border: 1px solid var(--line);
  background:
    linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 30px 30px,
    linear-gradient(90deg, var(--line) 1px, transparent 1px) 0 0 / 30px 30px,
    #050507;
  overflow: hidden;
}
.sizer-hole {
  --size: 56px;
  position: relative;
  z-index: 1;
  width: var(--size);
  height: var(--size);
  flex: none;
  border-radius: 50%;
  background: #000;
  box-shadow:
    0 0 0 calc(var(--size) * 0.05) rgba(255, 178, 79, 0.85),
    0 0 calc(var(--size) * 0.35) calc(var(--size) * 0.12) rgba(255, 122, 26, 0.45),
    0 0 calc(var(--size) * 0.9) calc(var(--size) * 0.25) rgba(255, 90, 28, 0.15);
  transition: width 700ms var(--ease-out), height 700ms var(--ease-out), box-shadow 700ms var(--ease-out);
}
.sizer-ref {
  --size: 10px;
  position: absolute;
  z-index: 2;
  left: 50%;
  top: 50%;
  width: var(--size);
  height: var(--size);
  transform: translate(-50%, -50%);
  border: 1px dashed var(--accent);
  border-radius: 50%;
  transition: width 700ms var(--ease-out), height 700ms var(--ease-out);
}
.sizer-ref[hidden] {
  display: none;
}
.sizer-view.is-beside .sizer-ref {
  position: relative;
  left: auto;
  top: auto;
  transform: none;
  border-style: solid;
  background: radial-gradient(circle at 35% 35%, #cfe9ef, #5b8f9b 60%, #23434b);
  border-color: transparent;
}
.sizer-ref-label {
  position: absolute;
  left: 50%;
  top: calc(100% + 10px);
  transform: translateX(-50%);
  white-space: nowrap;
  font: 500 11px/1 var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}
.sizer-kicker {
  margin: 0 0 10px;
  font: 500 11.5px/1.4 var(--font-mono);
  letter-spacing: 0.12em;
  color: var(--accent);
}
.sizer-big {
  margin: 0 0 12px;
  font: 450 clamp(1.8rem, 4vw, 2.8rem)/1.05 var(--font-sans);
  letter-spacing: -0.03em;
  color: var(--fg);
}
.sizer-text {
  margin: 0;
  color: var(--fg-muted);
  max-width: 42ch;
}
html:not(.js) .sizer-picks,
html:not(.js) .sizer-view {
  display: none;
}

@media (prefers-reduced-motion: reduce) {
  .hz-breathe {
    animation: none;
  }
}

/* ---------- Community chat buttons ---------- */

.btn-social .icon {
  width: 16px;
  height: 16px;
  flex: none;
}

/* ---------- Utilities ---------- */

.mt-0 { margin-top: 0; }
.mt-s { margin-top: 16px; }
.mt-m { margin-top: 32px; }
.mt-l { margin-top: 56px; }
.mt-xl { margin-top: 88px; }
.mb-0 { margin-bottom: 0; }
.mb-m { margin-bottom: 32px; }
.mb-l { margin-bottom: 56px; }
.maxw-prose { max-width: 66ch; }

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    transition-delay: 0ms !important;
  }
  .js .reveal,
  .js .grid > .reveal > * {
    transform: none;
  }
  .js [data-draw] path,
  .js [data-draw] circle,
  .js [data-draw] line,
  .js [data-draw] polyline {
    stroke-dashoffset: 0;
  }
  .js .rule.reveal {
    transform: none;
  }
}

/* ---------- Print ---------- */

@media print {
  :root {
    --bg: #fff;
    --fg: #000;
    --fg-muted: #222;
    --fg-dim: #444;
  }
  .site-header,
  .nav-toggle,
  .btn-copy,
  .toast,
  .hero-visual {
    display: none !important;
  }
  .js .reveal {
    opacity: 1;
    transform: none;
  }
}