/* PQLN website. One stage, two accents: orange marks classical secp256k1, blue marks post-quantum. */

:root {
  --stage: #05051c;
  --stage-2: #0a0a28;
  --ink: #f2f2f2;
  --ink-2: rgba(242, 242, 242, .72);
  --ink-3: rgba(242, 242, 242, .46);
  --ink-4: rgba(242, 242, 242, .22);
  --hair: rgba(242, 242, 242, .12);
  --hair-2: rgba(242, 242, 242, .24);
  --pq: #6e6eff;
  --pq-hi: #a9a9ff;
  --pq-deep: #0000f2;
  --cl: #f27900;
  --cl-hi: #ffa04a;

  --display: "League Gothic", "Arial Narrow", Impact, sans-serif;
  --sans: "Archivo", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --nav-h: 56px;
  --gutter: clamp(16px, 4vw, 48px);
  --maxw: 1440px;
  --scrub: 170svh;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + var(--line-h, 0px));
}

body {
  margin: 0;
  background: var(--stage);
  color: var(--ink);
  font: 400 17px/1.55 var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}

a { color: inherit; }
svg, canvas { display: block; }
::selection { background: var(--pq); color: #fff; }
code { font-family: var(--mono); font-size: .86em; color: var(--pq-hi); }

a:focus-visible, button:focus-visible {
  outline: 2px solid var(--pq-hi);
  outline-offset: 3px;
}

.skip {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 10px 14px;
  background: var(--ink);
  color: var(--stage);
  font: 500 12px/1 var(--mono);
  transform: translateY(-200%);
}
.skip:focus { transform: none; }

/* Shared label style, the mono "meta" voice of the page. */
.eyebrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font: 500 11.5px/1.2 var(--mono);
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.eyebrow b { font-weight: 500; color: var(--pq-hi); }
.eyebrow span::before { content: "·"; margin-right: 10px; color: var(--ink-4); }
.hero .eyebrow::before { content: ""; width: 22px; height: 1px; background: var(--pq); }

/* Top line: a short note above the navigation. The header and the first screens move down by its height. */

:root:has(.top-line) { --line-h: 34px; }
.top-line {
  position: fixed;
  inset: 0 0 auto;
  z-index: 60;
  padding: 7px var(--gutter);
  background: #0b0b2c;
  border-bottom: 1px solid var(--hair);
  font: 500 11px/1.35 var(--mono);
  letter-spacing: .04em;
  text-align: center;
  color: var(--ink-2);
}
.top-line p { margin: 0; }
.top-line a {
  white-space: nowrap;
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--ink-4);
  text-underline-offset: 3px;
}
.top-line a:hover { text-decoration-color: var(--ink); }

/* Navigation */

.nav {
  position: fixed;
  inset: 0 0 auto;
  top: var(--line-h, 0px);
  z-index: 50;
  height: var(--nav-h);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 var(--gutter);
  background: rgba(5, 5, 28, .78);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--hair);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  justify-self: start;
  text-decoration: none;
  font: 400 27px/1 var(--display);
  letter-spacing: .05em;
}
.brand-mark { width: 12px; height: 17px; fill: var(--pq); }

.tracker {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 6px;
}
.tracker::before {
  content: "BOLT";
  margin-right: 6px;
  font: 500 10.5px/1 var(--mono);
  letter-spacing: .1em;
  color: var(--ink-3);
}
.tracker a {
  display: grid;
  place-items: center;
  min-width: 30px;
  height: 24px;
  padding: 0 6px;
  font: 500 11px/1 var(--mono);
  text-decoration: none;
  color: var(--ink-3);
  border: 1px solid var(--hair-2);
  transition: color .3s, border-color .3s, background-color .3s;
}
.tracker a:hover { color: var(--ink); border-color: var(--ink-3); }
.tracker li.active a { color: var(--ink); border-color: var(--pq); }
.tracker li.done a { color: #fff; border-color: var(--pq); background: var(--pq); }

.links { justify-self: end; display: flex; gap: 24px; }
.links a {
  font: 500 11.5px/1 var(--mono);
  letter-spacing: .1em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink-2);
}
.links a:hover { color: var(--ink); }

.progress { position: absolute; left: 0; right: 0; bottom: -1px; height: 1px; }
.progress i {
  display: block;
  height: 100%;
  background: var(--pq);
  transform-origin: 0 50%;
  transform: scaleX(0);
}

/* Hero */

.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  grid-template-rows: 1fr auto;
  padding: calc(var(--nav-h) + var(--line-h, 0px) + 40px) var(--gutter) 0;
  overflow: hidden;
  isolation: isolate;
}
.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}
/* A soft scrim keeps the rays from competing with the headline. */
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(90deg, rgba(5, 5, 28, .72) 0%, rgba(5, 5, 28, .4) 38%, rgba(5, 5, 28, 0) 62%);
  pointer-events: none;
}
.hero-inner {
  align-self: center;
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
}
.hero-inner > * { max-width: min(780px, 54vw); }

.hero h1 {
  margin: 0 0 .2em;
  font: 400 clamp(76px, 11.4vw, 196px)/.84 var(--display);
  letter-spacing: .005em;
  text-transform: uppercase;
}
.hero-inner > h1 { max-width: none; }
.hero h1 .w { display: block; white-space: nowrap; }
.hero h1 .i { transition: color .9s ease 2.1s; }
.ready .hero h1 .i { color: var(--pq); }

.lede {
  margin: 0;
  font-size: clamp(17px, 1.3vw, 20px);
  color: var(--ink-2);
}

.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  height: 46px;
  padding: 0 20px;
  font: 500 12px/1 var(--mono);
  letter-spacing: .09em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink);
  border: 1px solid var(--hair-2);
  transition: background-color .25s, color .25s, border-color .25s;
}
.btn:hover { border-color: var(--ink); }
.btn-solid { background: var(--ink); color: var(--stage); border-color: var(--ink); }
.btn-solid:hover { background: var(--pq); border-color: var(--pq); color: #fff; }

.surfaces {
  list-style: none;
  width: calc(100% + 2 * var(--gutter));
  margin: 56px calc(-1 * var(--gutter)) 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border-top: 1px solid var(--hair);
  background: rgba(5, 5, 28, .55);
}
.surfaces li + li { border-left: 1px solid var(--hair); }
.surfaces a {
  display: block;
  padding: 18px var(--gutter) 22px;
  text-decoration: none;
  font: 400 clamp(24px, 2.2vw, 34px)/1 var(--display);
  letter-spacing: .01em;
  text-transform: uppercase;
  transition: background-color .25s;
}
.surfaces a span {
  display: block;
  margin-bottom: 10px;
  font: 500 11px/1 var(--mono);
  letter-spacing: .09em;
  color: var(--pq-hi);
}
.surfaces a:hover { background: rgba(110, 110, 255, .1); }

.plate, .cue {
  position: absolute;
  bottom: 128px;
  margin: 0;
  font: 500 10.5px/1 var(--mono);
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.plate { right: var(--gutter); }
.cue { left: 50%; display: grid; justify-items: center; gap: 10px; transform: translateX(-50%); }
.cue i {
  width: 1px;
  height: 34px;
  background: linear-gradient(var(--ink-3), transparent);
  animation: cue 2.4s ease-in-out infinite;
  transform-origin: top;
}
@keyframes cue {
  0% { transform: scaleY(0); opacity: 1; }
  60% { transform: scaleY(1); opacity: 1; }
  100% { transform: scaleY(1); opacity: 0; }
}

/* Chapters: a tall section whose sticky frame holds the copy and an animated stage. */

.chapter {
  position: relative;
  border-top: 1px solid var(--hair);
}
.sticky { min-height: 100vh; }
.js .chapter {
  height: calc(100vh + var(--scrub));
  height: calc(100svh + var(--scrub));
}
.js .sticky {
  position: sticky;
  top: 0;
  height: 100vh;
  height: 100svh;
  overflow: hidden;
}
/* Without scripts the diagrams cannot draw, so the chapters fall back to plain text. */
html:not(.js) .stage:not(.stage-html) { display: none; }
.frame {
  height: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(320px, 5fr) 7fr;
  gap: clamp(28px, 4vw, 72px);
  align-items: center;
  padding: calc(var(--nav-h) + var(--line-h, 0px) + 28px) var(--gutter) 28px;
}
.copy { max-width: 520px; }
.copy h2 {
  margin: 0 0 26px;
  font: 400 clamp(52px, 6vw, 104px)/.86 var(--display);
  letter-spacing: .005em;
  text-transform: uppercase;
  text-wrap: balance;
}

.beats {
  display: grid;
  font-size: clamp(17px, 1.3vw, 20px);
  line-height: 1.5;
  color: var(--ink-2);
}
.beat { margin: 0; }
/* The old caption leaves first and the new one follows, so two sentences never overlap. */
.js .beat {
  grid-area: 1 / 1;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity .22s ease, transform .22s ease;
}
.js .beat.on {
  opacity: 1;
  transform: none;
  transition: opacity .35s ease .22s, transform .35s ease .22s;
}

.steps { list-style: none; display: flex; gap: 6px; margin: 24px 0 0; padding: 0; }
.steps li { position: relative; width: 30px; height: 2px; background: var(--hair-2); overflow: hidden; }
.steps li::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--pq);
  transform-origin: 0 50%;
  transform: scaleX(var(--f, 0));
}

.facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 36px 0 0;
  border-top: 1px solid var(--hair);
}
.facts div { padding: 14px 14px 0 0; }
.facts div + div { padding-left: 14px; border-left: 1px solid var(--hair); }
.facts dt { font: 400 30px/1 var(--display); letter-spacing: .01em; }
.facts dd {
  margin: 8px 0 0;
  font: 500 10.5px/1.35 var(--mono);
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.stage {
  position: relative;
  margin: 0;
  height: 100%;
  max-height: 760px;
  min-height: 0;
}
.stage::before {
  content: "";
  position: absolute;
  inset: -4%;
  background: radial-gradient(circle, rgba(242, 242, 242, .1) 1px, transparent 1.4px) 0 0 / 22px 22px;
  -webkit-mask-image: radial-gradient(closest-side, #000 55%, transparent);
  mask-image: radial-gradient(closest-side, #000 55%, transparent);
  pointer-events: none;
}
.stage svg { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; }

/* SVG vocabulary shared by all scenes. */
.stage text {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .06em;
  fill: var(--ink-2);
}
.stage text.lg { font-family: var(--display); font-size: 24px; font-weight: 400; letter-spacing: .02em; fill: var(--ink); }
.stage text.sm { font-size: 9.5px; fill: var(--ink-3); }
.stage text.dim { fill: var(--ink-3); }
.stage text.pq { fill: var(--pq-hi); }
.stage text.cl { fill: var(--cl-hi); }
.stage text.on-pq { fill: #fff; }
.stage text.on-ink { fill: var(--stage); }

/* Onion: the routing node view switch. */
.toggle {
  position: absolute;
  right: 0;
  bottom: 0;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font: 500 11px/1 var(--mono);
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ink-2);
  cursor: pointer;
  user-select: none;
}
.toggle input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.toggle-ui { position: relative; width: 34px; height: 18px; border: 1px solid var(--hair-2); transition: border-color .25s; }
.toggle-ui::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 10px;
  height: 10px;
  background: var(--ink-3);
  transition: transform .25s, background-color .25s;
}
.toggle input:checked + .toggle-ui { border-color: var(--pq); }
.toggle input:checked + .toggle-ui::after { transform: translateX(16px); background: var(--pq); }
.toggle input:focus-visible + .toggle-ui { outline: 2px solid var(--pq-hi); outline-offset: 3px; }

/* Cost: an HTML stage with counters and bars. */
.stage-html {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: clamp(28px, 6vh, 64px);
}
.stage-html::before { display: none; }

.stats { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--hair); }
.stat { padding: 16px 18px 0 0; }
.stat + .stat { padding-left: 18px; border-left: 1px solid var(--hair); }
.stat-k, .bars-k, .bar-n {
  font: 500 11px/1.35 var(--mono);
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.stat-k { display: block; margin-bottom: 12px; }
.stat b {
  font: 400 clamp(56px, 6.4vw, 118px)/.9 var(--display);
  letter-spacing: .005em;
  font-variant-numeric: tabular-nums;
}
.stat-u { margin-left: 6px; font: 400 clamp(22px, 2vw, 34px)/1 var(--display); color: var(--ink-3); }

.bars-k { margin: 0 0 14px; }
.bar {
  display: grid;
  grid-template-columns: minmax(150px, 230px) 1fr 76px;
  align-items: center;
  gap: 16px;
  padding: 12px 0;
  border-top: 1px solid var(--hair);
}
.bar-n { color: var(--ink-2); }
.bar-t { position: relative; height: 16px; }
.bar-t i {
  position: absolute;
  inset: 0;
  background: var(--ink-3);
  transform-origin: 0 50%;
  transform: scaleX(var(--w, 0));
}
.bar-pq .bar-t i { background: var(--pq); }
.bar b { font: 400 30px/1 var(--display); text-align: right; font-variant-numeric: tabular-nums; }

/* Closing: the blue slab. */

.closing {
  position: relative;
  overflow: hidden;
  padding: clamp(84px, 13vh, 150px) var(--gutter) 0;
  background: var(--pq-deep);
  color: #fff;
}
.closing-inner { max-width: var(--maxw); margin: 0 auto; }
.closing .eyebrow { color: rgba(255, 255, 255, .72); }
.closing .eyebrow b { color: #fff; }
.closing .eyebrow span::before { color: rgba(255, 255, 255, .4); }
.closing h2 {
  margin: 0 0 28px;
  font: 400 clamp(64px, 9vw, 160px)/.86 var(--display);
  letter-spacing: .005em;
  text-transform: uppercase;
}
.note { max-width: 46em; margin: 0; font-size: clamp(16px, 1.25vw, 19px); color: rgba(255, 255, 255, .84); }
.note b { font-weight: 600; color: #fff; }

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 56px;
  border-top: 1px solid rgba(255, 255, 255, .32);
  border-bottom: 1px solid rgba(255, 255, 255, .32);
}
.card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 230px;
  padding: 24px 24px 24px 0;
  text-decoration: none;
  transition: background-color .25s;
}
.card + .card { padding-left: 24px; border-left: 1px solid rgba(255, 255, 255, .32); }
.card:hover { background: rgba(255, 255, 255, .07); }
.card-k, .card-go, .meta-k, .term-bar {
  font: 500 11px/1.3 var(--mono);
  letter-spacing: .09em;
  text-transform: uppercase;
}
.card-k { color: rgba(255, 255, 255, .72); }
.card-t { font: 400 clamp(26px, 2.3vw, 36px)/1 var(--display); letter-spacing: .01em; text-transform: uppercase; }
.card-go { margin-top: auto; }

.term, .cite {
  border: 1px solid rgba(255, 255, 255, .28);
  background: #02021a;
}
.term { margin-top: 48px; }
.term-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 8px 8px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, .16);
  color: rgba(255, 255, 255, .7);
}
.term pre, .cite pre {
  margin: 0;
  padding: 18px 16px;
  overflow-x: auto;
  font: 400 13.5px/1.75 var(--mono);
}
.term code, .cite code { color: #fff; font-size: 1em; }
.cite pre { font-size: 12.5px; line-height: 1.65; }

.copy-btn {
  height: 28px;
  padding: 0 12px;
  font: 500 10.5px/1 var(--mono);
  letter-spacing: .09em;
  text-transform: uppercase;
  color: #fff;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, .32);
  cursor: pointer;
  transition: background-color .2s, color .2s;
}
.copy-btn:hover { background: #fff; color: var(--pq-deep); }

.meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(28px, 4vw, 64px);
  align-items: start;
  margin-top: 56px;
}
.meta > * { min-width: 0; }
.meta-k { margin: 0 0 12px; color: rgba(255, 255, 255, .72); }
.authors ul { list-style: none; margin: 0; padding: 0; }
.authors li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 13px 0;
  border-top: 1px solid rgba(255, 255, 255, .28);
  font: 400 clamp(24px, 2vw, 30px)/1 var(--display);
  letter-spacing: .01em;
  text-transform: uppercase;
}
.authors li span {
  font: 500 10.5px/1.3 var(--mono);
  letter-spacing: .07em;
  color: rgba(255, 255, 255, .72);
  text-align: right;
}

.wordmark {
  margin: 80px 0 0;
  font: 400 clamp(150px, 41vw, 760px)/.76 var(--display);
  letter-spacing: .01em;
  text-align: center;
  color: transparent;
  background: radial-gradient(circle, #fff 1.25px, transparent 1.7px) 0 0 / 8px 8px;
  -webkit-background-clip: text;
  background-clip: text;
  user-select: none;
}

.foot {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 24px;
  max-width: var(--maxw);
  margin: 28px auto 0;
  padding: 20px 0 30px;
  border-top: 1px solid rgba(255, 255, 255, .32);
  font: 500 11px/1.3 var(--mono);
  letter-spacing: .09em;
  text-transform: uppercase;
}
.foot-links { display: flex; flex-wrap: wrap; gap: 22px; }
.foot a { text-decoration: none; color: rgba(255, 255, 255, .82); }
.foot a:hover { color: #fff; }

/* Narrow screens: the copy sits above the stage inside the sticky frame. */

@media (max-width: 1100px) {
  .hero-inner > * { max-width: min(680px, 64vw); }
  .cards { grid-template-columns: 1fr; }
  .card { min-height: 0; padding: 22px 0; }
  .card + .card { padding-left: 0; border-left: 0; border-top: 1px solid rgba(255, 255, 255, .32); }
}

@media (max-width: 1100px) and (orientation: portrait) {
  .hero-inner { align-self: end; padding-bottom: 32px; }
  .hero-inner > * { max-width: none; }
  .hero::after { background: linear-gradient(0deg, var(--stage) 0%, rgba(5, 5, 28, .85) 50%, rgba(5, 5, 28, 0) 68%); }
  .plate, .cue { display: none; }
}

@media (max-width: 860px) {
  .frame {
    grid-template-columns: 1fr;
    grid-template-rows: auto minmax(0, 1fr);
    align-items: stretch;
    gap: 14px;
    padding: calc(var(--nav-h) + var(--line-h, 0px) + 18px) var(--gutter) 18px;
  }
  .copy { max-width: 600px; }
  .copy h2 { margin-bottom: 12px; font-size: clamp(40px, 10.5vw, 66px); }
  .eyebrow { margin-bottom: 10px; }
  .beats { font-size: 15.5px; line-height: 1.45; }
  .steps { margin-top: 12px; }
  .facts { display: none; }
  .stage { max-height: none; }
  .meta { grid-template-columns: 1fr; }
  .bar { grid-template-columns: 1fr 64px; gap: 6px 12px; }
  .bar-n { grid-column: 1 / -1; }
}

@media (max-width: 720px) {
  .nav { grid-template-columns: auto 1fr; gap: 12px; }
  .tracker { justify-self: end; }
  .links { display: none; }
  .hero { padding-top: calc(var(--nav-h) + var(--line-h, 0px) + 24px); }
  .hero::after { background: linear-gradient(0deg, var(--stage) 0%, rgba(5, 5, 28, .85) 55%, rgba(5, 5, 28, 0) 72%); }
  .hero-inner { align-self: end; padding-bottom: 28px; }
  .hero-inner > * { max-width: none; }
  .hero h1 { font-size: clamp(56px, 16.5vw, 110px); }
  .lede { font-size: 16px; }
  .cta { margin-top: 24px; gap: 10px; }
  .btn { height: 44px; padding: 0 14px; gap: 8px; letter-spacing: .06em; }
  .stage-html { justify-content: flex-start; gap: 22px; padding-top: 4px; }
  .stat { padding-top: 12px; }
  .stat + .stat { padding-left: 14px; }
  .stat-k { margin-bottom: 8px; }
  .stat b { font-size: clamp(34px, 10vw, 60px); }
  .stat-u { font-size: 18px; }
  .bar { padding: 8px 0; }
  .bar b { font-size: 24px; }
  .bar-t { height: 12px; }
  .surfaces, .plate, .cue { display: none; }
  .authors li { flex-direction: column; align-items: flex-start; gap: 6px; }
  .authors li span { text-align: left; }
  .toggle { font-size: 10px; }
}

@media (max-width: 400px) {
  .tracker::before { display: none; }
  .tracker a { min-width: 26px; }
}

@media (max-height: 680px) and (min-width: 861px) {
  .copy h2 { font-size: clamp(44px, 5vw, 80px); margin-bottom: 18px; }
  .facts { margin-top: 22px; }
  .facts dt { font-size: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .chapter { height: auto; }
  .js .sticky { position: relative; height: auto; min-height: 100vh; }
  .stage { height: min(70vh, 640px); }
  .js .beat { grid-area: auto; opacity: 1; transform: none; }
  .beats { gap: 12px; }
  .steps, .cue { display: none; }
  .hero h1 .i { transition: none; }
}