.feat {
  --ink: #111;
  --lime: #d4f54a;
  --lime-deep: #b9de25;
  --lime-soft: #f0fbc9;
  --paper: #f4f4f0;
  --line: #e2e2da;
  --muted: #6e6e69;
  --serif: Georgia, "Times New Roman", serif;
  padding-bottom: 40px;
}
.wm {
  font:
    900 15px/1 Inter,
    system-ui,
    sans-serif;
  letter-spacing: -0.05em;
  color: var(--ink);
  white-space: nowrap;
}
.wm::after {
  content: "";
  display: inline-block;
  width: 0.26em;
  height: 0.26em;
  margin-left: 0.08em;
  border-radius: 50%;
  background: var(--lime-deep);
}
.feat-hero { padding: 64px 0 40px; text-align: center; }
.feat-hero .eyebrow { justify-content: center; }
.feat-hero h1 { margin: 26px auto 18px; }
.feat-hero .lede { max-width: 560px; margin: 0 auto; font-size: 18px; line-height: 1.7; color: var(--muted); }
.karaoke { max-width: 760px; margin: 46px auto 18px; font: 400 clamp(22px, 2.6vw, 32px) / 1.5 var(--serif); color: #9a9a92; }
.karaoke .w {
  border-radius: 4px;
  padding: 0 2px;
  transition:
    background-color 0.18s ease,
    color 0.18s ease;
}
.karaoke .w.heard { color: var(--ink); }
.karaoke .w.on { background: var(--lime); color: var(--ink); }
.hero-wave { display: flex; justify-content: center; align-items: center; gap: 4px; height: 46px; margin: 10px 0 34px; }
.hero-wave i {
  width: 4px;
  height: 100%;
  border-radius: 3px;
  background: var(--ink);
  transform: scaleY(0.2);
  animation: wave 1.1s ease-in-out infinite;
}
.hero-wave i:nth-child(3n) { animation-delay: -0.3s; background: var(--lime-deep); }
.hero-wave i:nth-child(3n + 1) { animation-delay: -0.6s; }
.hero-wave i:nth-child(4n) { animation-duration: 0.8s; }
.hero-wave i:nth-child(5n) { animation-duration: 1.4s; }
@keyframes wave {
  50% { transform: scaleY(1); }
}
.scroll-cue {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  border: 1px solid var(--ink);
  border-radius: 99px;
  font-size: 13px;
  font-weight: 650;
  transition:
    background-color 0.2s ease,
    transform 0.2s ease;
}
.scroll-cue:hover { background: var(--lime); transform: translateY(2px); text-decoration: none !important; }
.scroll-cue span { animation: nudge 1.6s ease-in-out infinite; }
@keyframes nudge {
  50% { transform: translateY(4px); }
}
.tour {
  position: relative;
  display: grid;
  grid-template-columns: 168px minmax(0, 0.9fr) minmax(0, 1.25fr);
  gap: 0 44px;
  padding: 30px 0 60px;
  scroll-margin-top: 80px;
}
.tour-progress {
  position: sticky;
  top: 76px;
  z-index: 6;
  grid-column: 1 / -1;
  height: 3px;
  margin-bottom: -3px;
  background: var(--line);
  border-radius: 3px;
  overflow: hidden;
}
.tour-progress i { display: block; height: 100%; width: 100%; background: var(--lime-deep); transform-origin: left; transform: scaleX(0); }
.tour-rail { position: sticky; top: 120px; display: block; align-self: start; margin: 0; padding-top: 30px; }
.tour-rail ol { margin: 0; padding: 0; list-style: none; }
.tour-rail a {
  text-decoration: none !important;
  position: relative;
  display: flex;
  gap: 10px;
  padding: 7px 0;
  font-size: 13px;
  color: #9a9a92;
  transition: color 0.2s ease;
}
.tour-rail a span {
  font:
    600 10px/1.9 ui-monospace,
    Menlo,
    monospace;
  color: #b8b8b0;
}
.tour-rail a:hover { color: var(--ink); text-decoration: none !important; }
.tour-rail a.on { color: var(--ink); font-weight: 650; }
.tour-rail a.on span { color: var(--lime-deep); }
.step {
  min-height: 78vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: 470px;
  padding: 40px 0;
  opacity: 0.28;
  transition: opacity 0.4s ease;
  scroll-margin-top: 90px;
}
.step.on { opacity: 1; }
.step-tag {
  font:
    600 11px/1 ui-monospace,
    Menlo,
    monospace;
  letter-spacing: 0.08em;
  color: #8a9a3a;
}
.step h2 { margin: 16px 0 16px; font-size: clamp(30px, 3vw, 42px); line-height: 1.08; letter-spacing: -0.045em; }
.step p { margin: 0; font-size: 16px; line-height: 1.75; color: #55554f; }
.facts { display: grid; gap: 9px; margin: 24px 0 0; padding: 0; list-style: none; }
.facts li { position: relative; padding-left: 26px; font-size: 14px; color: var(--ink); }
.facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 3px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--lime)
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M3 6.3l2 2 4-4.6' fill='none' stroke='%23111' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")
    center / 10px no-repeat;
}
.facts a { text-decoration: underline; text-decoration-color: var(--lime-deep); text-decoration-thickness: 2px; text-underline-offset: 3px; }
.stage { position: sticky; top: 104px; align-self: start; height: min(620px, calc(100vh - 140px)); margin-top: 30px; }
.fx-browser {
  display: flex;
  flex-direction: column;
  height: 100%;
  border: 1px solid #cfd0c6;
  border-radius: 14px;
  background: #fff;
  box-shadow:
    0 1px 2px rgba(20, 24, 8, 0.06),
    0 30px 80px rgba(30, 35, 10, 0.13);
  overflow: hidden;
}
.fx-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  height: 40px;
  padding: 0 12px;
  background: #f2f2ee;
  border-bottom: 1px solid #e3e3dc;
}
.fx-dots { display: flex; gap: 6px; }
.fx-dots i { width: 10px; height: 10px; border-radius: 50%; background: #d9d9d1; }
.url {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  padding: 5px 12px;
  border-radius: 99px;
  background: #fff;
  font-size: 11px;
  color: #8a8a84;
}
.ext-n {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 6px;
  background: var(--lime);
  font:
    900 13px/1 Inter,
    sans-serif;
}
.stage[data-scene="read"] .ext-n { animation: n-press 7s infinite; }
@keyframes n-press {
  0%,
  12% { box-shadow: 0 0 0 0 rgba(185, 222, 37, 0); transform: none; }
  15% { box-shadow: 0 0 0 6px rgba(185, 222, 37, 0.45); transform: scale(0.88); }
  20%,
  100% { box-shadow: 0 0 0 0 rgba(185, 222, 37, 0); transform: none; }
}
.screen { position: relative; flex: 1; overflow: hidden; background: #fff; }
.scene {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  transform: scale(0.985);
  transition:
    opacity 0.45s ease,
    transform 0.45s ease,
    visibility 0s linear 0.45s;
}
.scene.on {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition:
    opacity 0.45s ease,
    transform 0.45s ease;
}
.art { padding: 30px 38px; font: 15px/1.8 var(--serif); color: #2b2b27; }
.art h4 {
  margin: 0 0 6px;
  font:
    800 26px/1.15 Inter,
    sans-serif;
  letter-spacing: -0.045em;
  color: var(--ink);
}
.art .by {
  margin: 0 0 18px;
  font:
    12px/1.4 Inter,
    sans-serif;
  color: #8a8a84;
}
.art p { margin: 0 0 14px; }
.art span { border-radius: 3px; padding: 1px 0; }
.cursor {
  position: absolute;
  z-index: 5;
  width: 18px;
  height: 22px;
  background: #111;
  clip-path: polygon(0 0, 0 78%, 26% 60%, 44% 100%, 58% 94%, 42% 56%, 74% 56%);
  filter: drop-shadow(0 0 1px #fff) drop-shadow(0 2px 3px rgba(0, 0, 0, 0.3));
  opacity: 0;
}
.mini-card {
  position: absolute;
  top: 12px;
  right: 14px;
  width: 248px;
  padding: 14px;
  border: 1px solid #d6d6d0;
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.16);
  opacity: 0;
  transform: translateY(-8px) scale(0.97);
  transform-origin: top right;
}
.mc-top { display: flex; justify-content: space-between; padding-bottom: 10px; border-bottom: 1px solid #eee; }
.mc-x { color: #999; }
.mc-art,
.mc-voice { display: flex; gap: 10px; align-items: center; padding: 10px 0; border-bottom: 1px solid #eee; font-size: 12px; }
.mc-art small,
.mc-voice small { display: block; color: #888; font-size: 10px; }
.mc-thumb {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 6px;
  background: var(--lime);
  font: 900 16px Inter;
}
.mc-voice img { width: 30px; height: 30px; border-radius: 50%; }
.mc-btn {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  padding: 10px;
  border-radius: 8px;
  background: var(--lime);
  font: 700 12px Inter;
}
.tri {
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 8px solid currentColor;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
}
.s-read.play .cursor { animation: read-cursor 7s infinite; }
.s-read.play .mini-card { animation: read-card 7s infinite; }
.s-read.play .mc-btn { animation: read-btn 7s infinite; }
.s-read.play .s1 { animation: lit-a 7s infinite; }
.s-read.play .s2 { animation: lit-b 7s infinite; }
.s-read.play .s3 { animation: lit-c 7s infinite; }
@keyframes read-cursor {
  0% { left: 30%; top: 70%; opacity: 0; }
  5% { opacity: 1; }
  14% { left: 92%; top: 2%; opacity: 1; transform: none; }
  15.5% { transform: scale(0.85); }
  17% { transform: none; }
  32% { left: 84%; top: 44%; }
  34% { transform: scale(0.85); }
  36% { transform: none; }
  48% { left: 84%; top: 44%; opacity: 1; }
  54%,
  100% { left: 70%; top: 80%; opacity: 0; }
}
@keyframes read-card {
  0%,
  16% { opacity: 0; transform: translateY(-8px) scale(0.97); }
  20%,
  40% { opacity: 1; transform: none; }
  46%,
  100% { opacity: 0; transform: translateY(-6px) scale(0.98); }
}
@keyframes read-btn {
  0%,
  33% { background: var(--lime); transform: none; }
  34.5% { background: var(--lime-deep); transform: scale(0.96); }
  37%,
  100% { background: var(--lime); transform: none; }
}
@keyframes lit-a {
  0%,
  44% { background: transparent; }
  46%,
  62% { background: var(--lime); }
  64%,
  100% { background: transparent; }
}
@keyframes lit-b {
  0%,
  62% { background: transparent; }
  64%,
  80% { background: var(--lime); }
  82%,
  100% { background: transparent; }
}
@keyframes lit-c {
  0%,
  80% { background: transparent; }
  82%,
  97% { background: var(--lime); }
  100% { background: transparent; }
}
.art.scrolling { will-change: transform; }
.s-follow.play .art { animation: follow-scroll 8s infinite; }
.s-follow.play .f1 { animation: follow-1 8s infinite; }
.s-follow.play .f2 { animation: follow-2 8s infinite; }
.s-follow.play .f3 { animation: follow-3 8s infinite; }
.s-follow.play .f4 { animation: follow-4 8s infinite; }
.s-follow.play .f6 { animation: follow-6 8s infinite; }
.s-follow.play .cursor { animation: follow-cursor 8s infinite; }
.s-follow.play .alt-tag { animation: follow-tag 8s infinite; }
@keyframes follow-scroll {
  0%,
  20% { transform: none; }
  45% { transform: translateY(-42px); }
  62%,
  92% { transform: translateY(-96px); }
  100% { transform: none; }
}
@keyframes follow-1 {
  0%,
  13% { background: var(--lime); }
  14%,
  100% { background: transparent; }
}
@keyframes follow-2 {
  0%,
  13% { background: transparent; }
  14%,
  27% { background: var(--lime); }
  28%,
  100% { background: transparent; }
}
@keyframes follow-3 {
  0%,
  27% { background: transparent; }
  28%,
  41% { background: var(--lime); }
  42%,
  100% { background: transparent; }
}
@keyframes follow-4 {
  0%,
  41% { background: transparent; }
  42%,
  59% { background: var(--lime); }
  60%,
  100% { background: transparent; }
}
@keyframes follow-6 {
  0%,
  59% { background: transparent; }
  60%,
  94% { background: var(--lime); }
  96%,
  100% { background: transparent; }
}
@keyframes follow-cursor {
  0%,
  44% { left: 20%; top: 85%; opacity: 0; }
  50% { left: 46%; top: 62%; opacity: 1; transform: none; }
  58% { left: 46%; top: 62%; transform: none; }
  59.5% { transform: scale(0.85); }
  61% { transform: none; }
  72% { left: 46%; top: 62%; opacity: 1; }
  80%,
  100% { left: 60%; top: 90%; opacity: 0; }
}
.alt-tag {
  position: absolute;
  left: 50%;
  top: 70%;
  padding: 6px 10px;
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
  font: 600 12px Inter;
  opacity: 0;
}
.alt-tag kbd { padding: 1px 5px; border-radius: 4px; background: #333; font: inherit; }
@keyframes follow-tag {
  0%,
  50% { opacity: 0; transform: translateY(4px); }
  54%,
  74% { opacity: 1; transform: none; }
  80%,
  100% { opacity: 0; }
}
.sel { background: linear-gradient(#b8d6fb, #b8d6fb) no-repeat left / 0% 100%; }
.s-select.play .sel { animation: select-sweep 6s infinite; }
@keyframes select-sweep {
  0%,
  8% { background-size: 0% 100%; }
  32%,
  92% { background-size: 100% 100%; }
  96%,
  100% { background-size: 0% 100%; }
}
.sel-menu {
  position: absolute;
  left: 30%;
  top: 205px;
  width: 230px;
  padding: 12px;
  border: 1px solid #d0d0c8;
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.14);
  opacity: 0;
}
.sel-menu .row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 8px;
  padding: 8px;
  border-radius: 7px;
  font: 600 12px Inter;
}
.sel-menu .row kbd { margin-left: auto; color: #999; font: 11px Inter; }
.sel-menu .arr { font-style: normal; }
.s-select.play .sel-menu { animation: select-menu 6s infinite; }
.s-select.play .sel-menu .row:first-of-type { animation: select-row 6s infinite; }
@keyframes select-menu {
  0%,
  36% { opacity: 0; transform: translateY(6px) scale(0.96); }
  42%,
  90% { opacity: 1; transform: none; }
  95%,
  100% { opacity: 0; }
}
@keyframes select-row {
  0%,
  58% { background: transparent; }
  62%,
  76% { background: var(--lime-soft); }
  80%,
  100% { background: transparent; }
}
.art.dim { opacity: 0.55; }
.hl { background: var(--lime); }
.bar-player {
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 18px;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 18px;
  border: 1px solid #ddd;
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.14);
  overflow: hidden;
}
.bp-progress { position: absolute; left: 0; right: 0; top: 0; height: 3px; background: #eee; }
.bp-progress i { display: block; height: 100%; width: 30%; background: var(--lime-deep); }
.bp-title { min-width: 0; flex: 1; font-size: 12px; overflow: hidden; white-space: nowrap; }
.bp-title small { display: block; color: #999; font-size: 10px; }
.bp-ctrl { display: flex; align-items: center; gap: 12px; }
.bp-ctrl .prev,
.bp-ctrl .next { width: 10px; height: 12px; background: #111; clip-path: polygon(100% 0, 100% 100%, 20% 50%, 20% 100%, 0 100%, 0 0, 20% 0, 20% 50%); }
.bp-ctrl .next { transform: scaleX(-1); }
.bp-ctrl .play { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 50%; background: var(--lime); }
.eq { display: flex; align-items: center; gap: 2px; height: 16px; }
.eq s { width: 3px; height: 100%; border-radius: 2px; background: #111; transform: scaleY(0.3); animation: wave 0.9s ease-in-out infinite; }
.eq s:nth-child(2) { animation-delay: -0.3s; }
.eq s:nth-child(3) { animation-delay: -0.6s; }
.eq s:nth-child(4) { animation-delay: -0.15s; }
.bp-vol { width: 56px; height: 4px; border-radius: 4px; background: #e6e6e0; }
.bp-vol i { display: block; width: 60%; height: 100%; border-radius: 4px; background: var(--lime-deep); }
.bp-speed { position: relative; width: 42px; height: 18px; font: 700 12px/18px Inter; }
.bp-speed b { position: absolute; inset: 0; text-align: center; opacity: 0; }
.bp-speed .sp1 { opacity: 1; }
.card-player {
  position: absolute;
  right: 18px;
  bottom: 18px;
  width: 270px;
  padding: 14px;
  border: 1px solid #ddd;
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.14);
  opacity: 0;
}
.cp-time { float: right; color: #888; font-size: 11px; }
.card-player ol { margin: 12px 0 0; padding: 0; list-style: none; font-size: 12px; color: #777; }
.card-player li { padding: 6px 8px; border-radius: 6px; }
.card-player li.on { background: var(--lime-soft); color: #111; font-weight: 600; }
.s-player.play .bar-player { animation: bar-life 9s infinite; }
.s-player.play .bp-progress i { animation: bar-progress 9s infinite; }
.s-player.play .bp-speed .sp1 { animation: speed-1 9s infinite; }
.s-player.play .bp-speed .sp2 { animation: speed-2 9s infinite; }
.s-player.play .bp-speed .sp3 { animation: speed-3 9s infinite; }
.s-player.play .bp-speed .sp4 { animation: speed-4 9s infinite; }
.s-player.play .card-player { animation: card-life 9s infinite; }
@keyframes bar-life {
  0% { opacity: 0; transform: translateY(30px); }
  6%,
  50% { opacity: 1; transform: none; }
  56%,
  100% { opacity: 0; transform: translateY(20px); }
}
@keyframes bar-progress {
  0% { width: 20%; }
  50%,
  100% { width: 46%; }
}
@keyframes speed-1 {
  0%,
  14% { opacity: 1; }
  15%,
  100% { opacity: 0; }
}
@keyframes speed-2 {
  0%,
  14% { opacity: 0; }
  15%,
  26% { opacity: 1; }
  27%,
  100% { opacity: 0; }
}
@keyframes speed-3 {
  0%,
  26% { opacity: 0; }
  27%,
  38% { opacity: 1; }
  39%,
  100% { opacity: 0; }
}
@keyframes speed-4 {
  0%,
  38% { opacity: 0; }
  39%,
  56% { opacity: 1; }
  57%,
  100% { opacity: 0; }
}
@keyframes card-life {
  0%,
  54% { opacity: 0; transform: translateY(20px) scale(0.97); }
  60%,
  94% { opacity: 1; transform: none; }
  100% { opacity: 0; }
}
.rd-busy {
  position: absolute;
  inset: 0;
  overflow: hidden;
  background: #fff;
  font:
    12px/1.5 Inter,
    sans-serif;
}
.bz-nav {
  display: flex;
  align-items: center;
  gap: 18px;
  height: 46px;
  padding: 0 20px;
  border-bottom: 1px solid #eee;
  color: #555;
}
.bz-nav b { margin-right: 10px; font: 700 14px/1 var(--serif); letter-spacing: 0.06em; color: #111; }
.bz-nav i {
  margin-left: auto;
  padding: 7px 12px;
  border-radius: 6px;
  background: #c8102e;
  color: #fff;
  font-style: normal;
  font-weight: 650;
}
.bz-grid { display: grid; grid-template-columns: minmax(0, 1fr) 170px; gap: 24px; padding: 22px 20px; }
.bz-kicker { color: #c8102e; font-size: 10px; font-weight: 700; letter-spacing: 0.12em; }
.bz-main h4 { margin: 6px 0 10px; font: 700 26px/1.15 var(--serif); color: #111; }
.bz-main p { margin: 0 0 12px; font: 14px/1.7 var(--serif); color: #333; }
.bz-ad {
  display: grid;
  place-items: center;
  height: 150px;
  margin-top: 16px;
  border-radius: 6px;
  background: repeating-linear-gradient(45deg, #f6ece6, #f6ece6 10px, #faf3ef 10px, #faf3ef 20px);
  color: #c58b6a;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.bz-ad.wide { height: 60px; margin: 4px 0 14px; }
.bz-side { display: flex; flex-direction: column; gap: 10px; }
.bz-side b { font-size: 13px; color: #111; }
.bz-side span {
  display: flex;
  gap: 8px;
  padding-bottom: 10px;
  border-bottom: 1px solid #f0f0ee;
  font-size: 12px;
  line-height: 1.4;
  color: #444;
}
.bz-side span i { font: 700 16px/1 var(--serif); font-style: normal; color: #c8102e; }
.bz-modal {
  position: absolute;
  left: 50%;
  top: 44%;
  width: 250px;
  margin-left: -125px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 20px 18px;
  border-radius: 14px;
  background: #fff;
  box-shadow:
    0 0 0 100vmax rgba(0, 0, 0, 0.28),
    0 20px 50px rgba(0, 0, 0, 0.3);
  text-align: center;
  opacity: 0;
}
.bz-modal b { font: 700 17px/1.2 var(--serif); }
.bz-modal span { color: #666; }
.bz-modal i {
  margin-top: 6px;
  padding: 9px;
  border-radius: 8px;
  background: #c8102e;
  color: #fff;
  font-style: normal;
  font-weight: 650;
}
.bz-modal em { position: absolute; right: 12px; top: 8px; font-style: normal; color: #999; }
.bz-cookie {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 20px;
  background: #1d1d1b;
  color: #ddd;
  transform: translateY(100%);
}
.bz-cookie span { flex: 1; }
.bz-cookie i { padding: 7px 12px; border-radius: 6px; background: #fff; color: #111; font-style: normal; font-weight: 650; }
.bz-cookie i.ghost { background: transparent; border: 1px solid #555; color: #ddd; }
.rd-view { position: absolute; inset: 0; padding: 22px 26px 0; overflow: hidden; background: #f4f4f0; opacity: 0; }
.rd-card {
  max-width: 520px;
  margin: 0 auto;
  padding: 26px 32px 30px;
  border: 1px solid #e7e7e2;
  border-radius: 14px;
  background: #fff;
  color: #2b2b27;
  font: 15px/1.75 var(--serif);
}
.rd-top {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  font:
    12px Inter,
    sans-serif;
  color: #8a8a84;
}
.rd-theme {
  position: relative;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  margin-left: auto;
  border: 1px solid #e7e7e2;
  border-radius: 50%;
  background: #fff;
  color: #111;
}
.rd-theme svg { position: absolute; width: 14px; height: 14px; }
.rd-theme .moon { fill: currentColor; }
.rd-theme .sun { fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; opacity: 0; }
.rd-exit { padding: 5px 12px; border: 1px solid #e7e7e2; border-radius: 99px; background: #fff; color: #111; font-weight: 600; }
.rd-card h4 { margin: 0 0 12px; font: 700 27px/1.2 var(--serif); color: #111; }
.rd-card p { margin: 0 0 12px; }
.rd-card p span { border-radius: 3px; padding: 1px 0; }
.s-reader.play .bz-nav { animation: bz-nav 8s infinite; }
.s-reader.play .bz-side { animation: bz-side 8s infinite; }
.s-reader.play .bz-ad { animation: bz-fade 8s infinite; }
.s-reader.play .bz-main { animation: bz-fade 8s infinite; }
.s-reader.play .bz-modal { animation: bz-modal 8s infinite; }
.s-reader.play .bz-cookie { animation: bz-cookie 8s infinite; }
.s-reader.play .rd-view { animation: rd-view 8s infinite; }
.s-reader.play .rd-card { animation: rd-card 8s infinite; }
.s-reader.play .rd-card h4,
.s-reader.play .rd-top .wm { animation: rd-ink 8s infinite; }
.s-reader.play .rd-theme,
.s-reader.play .rd-exit { animation: rd-button 8s infinite; }
.s-reader.play .rd-theme .moon { animation: rd-moon 8s infinite; }
.s-reader.play .rd-theme .sun { animation: rd-sun 8s infinite; }
.s-reader.play .r1 { animation: rd-r1 8s infinite; }
.s-reader.play .r2 { animation: rd-r2 8s infinite; }
.s-reader.play .r3 { animation: rd-r3 8s infinite; }
.s-reader.play .r4 { animation: rd-r4 8s infinite; }
.s-reader.play .cursor { animation: rd-cursor 8s infinite; }
@keyframes bz-nav {
  0%,
  22% { transform: none; opacity: 1; }
  29%,
  95% { transform: translateY(-100%); opacity: 0; }
  100% { transform: none; opacity: 1; }
}
@keyframes bz-side {
  0%,
  22% { transform: none; opacity: 1; }
  29%,
  95% { transform: translateX(120%); opacity: 0; }
  100% { transform: none; opacity: 1; }
}
@keyframes bz-fade {
  0%,
  23% { opacity: 1; }
  29%,
  95% { opacity: 0; }
  100% { opacity: 1; }
}
@keyframes bz-modal {
  0%,
  7% { opacity: 0; transform: translateY(10px) scale(0.94); }
  11%,
  21% { opacity: 1; transform: none; }
  26%,
  100% { opacity: 0; transform: scale(0.9); }
}
@keyframes bz-cookie {
  0%,
  3% { transform: translateY(100%); }
  7%,
  22% { transform: none; }
  28%,
  100% { transform: translateY(100%); }
}
@keyframes rd-view {
  0%,
  27% { opacity: 0; background: #f4f4f0; }
  33%,
  57% { opacity: 1; background: #f4f4f0; }
  61%,
  93% { opacity: 1; background: #121211; }
  98%,
  100% { opacity: 0; background: #121211; }
}
@keyframes rd-card {
  0%,
  27% { transform: translateY(18px) scale(0.98); background: #fff; border-color: #e7e7e2; color: #2b2b27; }
  34%,
  57% { transform: none; background: #fff; border-color: #e7e7e2; color: #2b2b27; }
  61%,
  100% { transform: none; background: #1b1b19; border-color: #2e2e2b; color: #e6e5de; }
}
@keyframes rd-ink {
  0%,
  57% { color: #111; }
  61%,
  100% { color: #f2f1ec; }
}
@keyframes rd-button {
  0%,
  57% { background: #fff; border-color: #e7e7e2; color: #111; }
  61%,
  100% { background: #232321; border-color: #3a3a36; color: #f2f1ec; }
}
@keyframes rd-moon {
  0%,
  57% { opacity: 1; transform: none; }
  61%,
  100% { opacity: 0; transform: rotate(-60deg) scale(0.5); }
}
@keyframes rd-sun {
  0%,
  57% { opacity: 0; transform: rotate(60deg) scale(0.5); }
  61%,
  100% { opacity: 1; transform: none; }
}
@keyframes rd-r1 {
  0%,
  36% { background: transparent; }
  37%,
  46% { background: var(--lime); }
  47%,
  100% { background: transparent; }
}
@keyframes rd-r2 {
  0%,
  46% { background: transparent; }
  47%,
  56% { background: var(--lime); }
  57%,
  100% { background: transparent; }
}
@keyframes rd-r3 {
  0%,
  57% { background: transparent; color: #2b2b27; }
  61%,
  63% { background: transparent; color: #e6e5de; }
  64%,
  76% { background: var(--lime); color: #111; }
  77%,
  100% { background: transparent; color: #e6e5de; }
}
@keyframes rd-r4 {
  0%,
  57% { background: transparent; color: #2b2b27; }
  61%,
  76% { background: transparent; color: #e6e5de; }
  77%,
  92% { background: var(--lime); color: #111; }
  93%,
  100% { background: transparent; color: #e6e5de; }
}
@keyframes rd-cursor {
  0%,
  44% { left: 60%; top: 80%; opacity: 0; transform: none; }
  48% { opacity: 1; }
  54% { left: var(--theme-x, 74%); top: var(--theme-y, 12%); transform: none; }
  57% { transform: scale(0.82); }
  59% { left: var(--theme-x, 74%); top: var(--theme-y, 12%); transform: none; opacity: 1; }
  66%,
  100% { left: 66%; top: 40%; opacity: 0; }
}
.s-voices { padding: 30px 34px; }
.lib-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 18px;
  font: 800 22px Inter;
  letter-spacing: -0.04em;
}
.lib-head span { font: 12px Inter; color: #999; letter-spacing: 0; }
.vcard {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 10px;
  padding: 12px 14px;
  border: 1px solid #e6e6e0;
  border-radius: 12px;
  font-size: 13px;
}
.vcard img { width: 46px; height: 46px; border-radius: 50%; }
.vcard small { display: block; color: #999; font-size: 11px; }
.vwave { display: flex; align-items: center; gap: 3px; height: 24px; margin-left: auto; opacity: 0.15; }
.vwave s { width: 3px; height: 100%; border-radius: 2px; background: #111; transform: scaleY(0.3); animation: wave 0.9s ease-in-out infinite; }
.vwave s:nth-child(2n) { animation-delay: -0.4s; }
.vwave s:nth-child(3n) { animation-delay: -0.7s; animation-duration: 1.2s; }
.s-voices.play .vcard { animation: voice-on 7.5s infinite; }
.s-voices.play .vcard .vwave { animation: voice-wave 7.5s infinite; }
.s-voices.play .v2,
.s-voices.play .v2 .vwave { animation-delay: 2.5s; }
.s-voices.play .v3,
.s-voices.play .v3 .vwave { animation-delay: 5s; }
@keyframes voice-on {
  0%,
  31% { background: var(--lime-soft); border-color: var(--ink); }
  34%,
  100% { background: #fff; border-color: #e6e6e0; }
}
@keyframes voice-wave {
  0%,
  31% { opacity: 1; }
  34%,
  100% { opacity: 0.15; }
}
.vote-chip {
  display: inline-block;
  margin-top: 12px;
  padding: 9px 14px;
  border-radius: 99px;
  background: var(--ink);
  color: #fff;
  font: 12px Inter;
}
.vote-chip b { color: var(--lime); }
.pdf-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  height: 46px;
  padding: 0 16px;
  border-bottom: 1px solid #eee;
  background: #fafaf8;
  font: 12px Inter;
}
.pdf-name { flex: 1; color: #999; }
.pdf-page b {
  position: relative;
  display: inline-block;
  width: 26px;
  height: 22px;
  margin: 0 4px;
  border: 1px solid #ddd;
  border-radius: 6px;
  background: #fff;
  vertical-align: middle;
}
.pdf-page i { position: absolute; inset: 0; font: 600 12px/20px Inter; font-style: normal; text-align: center; opacity: 0; }
.pdf-read {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid #111;
  border-radius: 99px;
  background: var(--lime);
  font-weight: 650;
}
.pdf-toc {
  position: absolute;
  left: 0;
  top: 46px;
  bottom: 0;
  width: 170px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 10px;
  border-right: 1px solid #eee;
  background: #fafaf8;
  font: 12px Inter;
}
.pdf-toc small { padding: 0 8px 6px; color: #aaa; font-size: 9px; letter-spacing: 0.14em; }
.pdf-toc span { padding: 6px 8px; border-radius: 6px; color: #777; }
.pdf-doc {
  position: absolute;
  left: 190px;
  right: 16px;
  top: 62px;
  bottom: 0;
  font: 13px/1.6 var(--serif);
  color: #2b2b27;
}
.pdf-doc h5 { margin: 0 0 6px; font: 700 16px Inter; letter-spacing: -0.02em; }
.pdf-doc p { margin: 0 0 10px; }
.pdf-fig {
  display: block;
  width: 86%;
  margin: 4px auto 0;
  padding: 8px;
  border: 1px solid #eee;
  border-radius: 8px;
  color: #222;
}
.pdf-fig rect,
.pdf-fig path[d^="M62"] { stroke-dasharray: 200; stroke-dashoffset: 0; }
.cap { margin: 6px 0 10px !important; text-align: center; font: 11px Inter; color: #888; }
.eqn { text-align: center; font: 16px/1.4 var(--serif); }
.eqn sup,
.eqn sub { font-size: 0.7em; }
.pdf-doc .code {
  margin: 0;
  padding: 8px 10px;
  border-radius: 6px;
  background: #f4f4f0;
  font:
    11px ui-monospace,
    Menlo,
    monospace;
}
.s-pdf.play .pdf-toc span { animation: toc-on 8s infinite; }
.s-pdf.play .pdf-toc .t2 { animation-delay: 2s; }
.s-pdf.play .pdf-toc .t3 { animation-delay: 4s; }
.s-pdf.play .pdf-toc .t4 { animation-delay: 6s; }
.s-pdf.play .pdf-page i { animation: page-on 6s infinite; }
.s-pdf.play .pdf-page .p2 { animation-delay: 2s; }
.s-pdf.play .pdf-page .p3 { animation-delay: 4s; }
.s-pdf.play .pdf-fig rect,
.s-pdf.play .pdf-fig path[d^="M62"] { animation: draw 4s ease-in-out infinite; }
.s-pdf.play .pdf-read { animation: soft-pulse 2.4s ease-in-out infinite; }
@keyframes toc-on {
  0%,
  24% { background: var(--lime-soft); color: #111; font-weight: 600; }
  26%,
  100% { background: transparent; color: #777; font-weight: 400; }
}
@keyframes page-on {
  0%,
  32% { opacity: 1; }
  34%,
  100% { opacity: 0; }
}
@keyframes draw {
  0% { stroke-dashoffset: 200; }
  45%,
  100% { stroke-dashoffset: 0; }
}
@keyframes soft-pulse {
  50% { box-shadow: 0 0 0 5px rgba(212, 245, 74, 0.45); }
}
.s-scan { display: flex; flex-direction: column; background: #f4f4f0; }
.sc-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  height: 46px;
  flex-shrink: 0;
  padding: 0 16px;
  border-bottom: 1px solid #e6e6e0;
  background: #fafaf8;
  font:
    12px Inter,
    sans-serif;
}
.sc-file { flex: 1; color: #999; }
.sc-badge { padding: 5px 10px; border-radius: 99px; background: var(--ink); color: var(--lime); font-weight: 650; font-size: 11px; }
.sc-body { flex: 1; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 18px; padding: 18px; min-height: 0; }
.sc-photo {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 26px 24px 22px 30px;
  overflow: hidden;
  border-radius: 3px;
  background: linear-gradient(90deg, rgba(60, 45, 20, 0.22), rgba(60, 45, 20, 0.04) 9%, transparent 16%), linear-gradient(180deg, #f1ead9, #e9e0c9);
  box-shadow: 0 10px 26px rgba(60, 45, 20, 0.22);
  transform: rotate(-1.2deg);
  font: 13.5px/1.55 var(--serif);
  color: #3b352b;
}
.sc-run { margin-bottom: 14px; font-size: 9px; letter-spacing: 0.2em; text-align: center; color: #8a8172; }
.sc-h { margin-bottom: 8px; font-size: 17px; font-weight: 700; }
.sl,
.sc-h,
.sc-run,
.sc-no { position: relative; align-self: flex-start; border-radius: 2px; white-space: nowrap; filter: blur(0.25px); }
.sc-run,
.sc-no { align-self: center; }
.sl.gap { margin-top: 12px; }
.sl:nth-child(odd) { opacity: 0.88; }
.sc-no { margin-top: auto; font-size: 11px; text-align: center; color: #8a8172; }
.sc-grain {
  position: absolute;
  inset: 0;
  background: radial-gradient(rgba(70, 55, 30, 0.16) 0.6px, transparent 1px) 0 0 / 3px 3px;
  mix-blend-mode: multiply;
  pointer-events: none;
}
.sc-beam {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 3px;
  background: var(--lime-deep);
  box-shadow: 0 0 18px 6px rgba(212, 245, 74, 0.55);
  opacity: 0;
}
.sc-out { position: relative; min-width: 0; padding: 20px 22px; border: 1px solid #e6e6e0; border-radius: 12px; background: #fff; }
.sc-progress {
  position: absolute;
  left: 22px;
  right: 22px;
  top: 40%;
  font:
    600 12px/1.5 Inter,
    sans-serif;
}
.sc-progress i { display: block; height: 6px; margin-top: 12px; border-radius: 99px; background: #ecece6; overflow: hidden; }
.sc-progress b { display: block; width: 0; height: 100%; border-radius: 99px; background: var(--lime-deep); }
.sc-article { font: 14px/1.7 var(--serif); color: #2b2b27; opacity: 0; }
.sc-article h5 {
  margin: 0 0 8px;
  font:
    700 17px/1.3 Inter,
    sans-serif;
  letter-spacing: -0.02em;
  color: #111;
}
.sc-article p { margin: 0 0 14px; }
.sc-article span { border-radius: 3px; padding: 1px 0; }
.sc-note {
  display: inline-block;
  padding: 4px 9px;
  border-radius: 99px;
  background: #f1f1ec;
  font:
    11px Inter,
    sans-serif;
  color: #777;
}
.s-scan.play .sc-beam { animation: sc-beam 8s linear infinite; }
.s-scan.play .sc-h { animation: sc-box 8s infinite; animation-delay: 0.55s; }
.s-scan.play .l1 { animation: sc-box 8s infinite; animation-delay: 0.85s; }
.s-scan.play .l2 { animation: sc-box 8s infinite; animation-delay: 1.15s; }
.s-scan.play .l3 { animation: sc-box 8s infinite; animation-delay: 1.45s; }
.s-scan.play .l4 { animation: sc-box 8s infinite; animation-delay: 1.75s; }
.s-scan.play .l5 { animation: sc-box 8s infinite; animation-delay: 2.05s; }
.s-scan.play .l6 { animation: sc-box 8s infinite; animation-delay: 2.35s; }
.s-scan.play .l7 { animation: sc-box 8s infinite; animation-delay: 2.75s; }
.s-scan.play .l8 { animation: sc-box 8s infinite; animation-delay: 3.05s; }
.s-scan.play .l9 { animation: sc-box 8s infinite; animation-delay: 3.35s; }
.s-scan.play .sc-run,
.s-scan.play .sc-no { animation: sc-skip 8s infinite; }
.s-scan.play .sc-progress { animation: sc-progress 8s infinite; }
.s-scan.play .sc-progress b { animation: sc-fill 8s linear infinite; }
.s-scan.play .sc-article { animation: sc-article 8s infinite; }
.s-scan.play .o1 { animation: sc-o1 8s infinite; }
.s-scan.play .o2 { animation: sc-o2 8s infinite; }
@keyframes sc-beam {
  0%,
  4% { top: 0; opacity: 0; }
  6% { opacity: 1; }
  46% { top: 100%; opacity: 1; }
  48%,
  100% { top: 100%; opacity: 0; }
}
@keyframes sc-box {
  0%,
  2% { background: transparent; box-shadow: none; }
  5%,
  76% { background: rgba(212, 245, 74, 0.38); box-shadow: 0 0 0 1px rgba(156, 194, 26, 0.9); }
  82%,
  100% { background: transparent; box-shadow: none; }
}
@keyframes sc-skip {
  0%,
  46% { opacity: 1; text-decoration: none; }
  50%,
  88% { opacity: 0.45; text-decoration: line-through; }
  94%,
  100% { opacity: 1; text-decoration: none; }
}
@keyframes sc-progress {
  0%,
  46% { opacity: 1; }
  50%,
  96% { opacity: 0; }
  100% { opacity: 1; }
}
@keyframes sc-fill {
  0%,
  4% { width: 0; }
  46%,
  100% { width: 100%; }
}
@keyframes sc-article {
  0%,
  49% { opacity: 0; transform: translateY(8px); }
  54%,
  94% { opacity: 1; transform: none; }
  100% { opacity: 0; }
}
@keyframes sc-o1 {
  0%,
  58% { background: transparent; }
  59%,
  73% { background: var(--lime); }
  74%,
  100% { background: transparent; }
}
@keyframes sc-o2 {
  0%,
  73% { background: transparent; }
  74%,
  90% { background: var(--lime); }
  91%,
  100% { background: transparent; }
}
.s-lang {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 30px;
  text-align: center;
}
.lang-word {
  font:
    800 clamp(48px, 6vw, 76px) / 1.1 Inter,
    system-ui,
    -apple-system,
    "Segoe UI",
    "PingFang SC",
    "Hiragino Sans",
    "Apple SD Gothic Neo",
    sans-serif;
  letter-spacing: -0.04em;
  transition:
    opacity 0.3s ease,
    transform 0.3s ease;
}
.lang-word.out { opacity: 0; transform: translateY(10px); }
.lang-detect { padding: 6px 12px; border-radius: 99px; background: var(--lime-soft); font: 13px Inter; }
.lang-chips { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px; max-width: 440px; margin-top: 8px; }
.lang-chips span {
  padding: 5px 11px;
  border: 1px solid #e3e3dc;
  border-radius: 99px;
  font:
    12px Inter,
    system-ui,
    -apple-system,
    "Segoe UI",
    "PingFang SC",
    "Hiragino Sans",
    "Apple SD Gothic Neo",
    sans-serif;
  transition:
    background-color 0.3s ease,
    border-color 0.3s ease;
}
.lang-chips span.on { background: var(--lime); border-color: var(--lime-deep); }
.lang-honest {
  max-width: 360px;
  margin-top: 8px;
  padding: 10px 14px;
  border: 1px dashed #cfcfc6;
  border-radius: 10px;
  font: 12px/1.5 Inter;
  color: #777;
}
.lang-honest b { color: #111; }
.s-fast { display: flex; flex-direction: column; justify-content: center; gap: 30px; padding: 36px; }
.fast-first { display: flex; align-items: baseline; gap: 12px; }
.fast-first b { font: 800 64px/1 Inter; letter-spacing: -0.05em; }
.fast-first span { color: #888; font: 14px Inter; }
.tl-label { font: 600 11px Inter; letter-spacing: 0.1em; text-transform: uppercase; color: #999; }
.tl-track { position: relative; height: 22px; margin: 10px 0 14px; border-radius: 99px; background: #ecece6; overflow: hidden; }
.tl-heard,
.tl-ready { position: absolute; top: 0; bottom: 0; }
.tl-heard { left: 0; width: 20%; background: #cfcfc6; }
.tl-ready { left: 20%; width: 18%; background: var(--lime); }
.tl-you {
  position: absolute;
  top: -2px;
  bottom: -2px;
  left: 20%;
  width: 4px;
  border-radius: 2px;
  background: var(--ink);
}
.tl-legend { display: flex; flex-wrap: wrap; gap: 8px 18px; font: 12px Inter; color: #666; }
.tl-legend i { display: inline-block; width: 10px; height: 10px; margin-right: 6px; border-radius: 3px; vertical-align: -1px; }
.k-heard { background: #cfcfc6; }
.k-ready { background: var(--lime); }
.k-rest { background: #ecece6; }
.fast-badges { display: flex; flex-wrap: wrap; gap: 8px; }
.fast-badges span { padding: 8px 12px; border-radius: 99px; background: var(--ink); color: #fff; font: 12px Inter; }
.s-fast.play .tl-heard { animation: tl-heard 8s linear infinite; }
.s-fast.play .tl-ready { animation: tl-ready 8s linear infinite; }
.s-fast.play .tl-you { animation: tl-you 8s linear infinite; }
.s-fast.play .fast-first b { animation: pop 8s infinite; }
@keyframes tl-heard {
  0% { width: 4%; }
  100% { width: 60%; }
}
@keyframes tl-ready {
  0% { left: 4%; width: 0; }
  6% { left: 7%; width: 18%; }
  100% { left: 60%; width: 18%; }
}
@keyframes tl-you {
  0% { left: 4%; }
  100% { left: 60%; }
}
@keyframes pop {
  0% { transform: scale(0.9); opacity: 0; }
  6%,
  100% { transform: none; opacity: 1; }
}
.keys { margin: 30px 0 0; padding: 60px 5%; border-radius: 24px; background: var(--ink); color: #fff; }
.keys-head { max-width: 560px; }
.keys-head .eyebrow { color: var(--lime); }
.keys-head h2 { margin: 14px 0 10px; color: #fff; font-size: clamp(30px, 3.4vw, 46px); letter-spacing: -0.045em; }
.keys-head p { margin: 0; color: #a8a8a0; }
.combos { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; margin-top: 36px; }
.combo {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 22px 18px;
  border: 1px solid #2c2c29;
  border-radius: 16px;
  background: #1a1a18;
  transition:
    border-color 0.3s ease,
    background-color 0.3s ease,
    transform 0.3s ease;
}
.combo b { font: 600 14px Inter; }
.combo.done { border-color: var(--lime); background: #22261a; transform: translateY(-3px); }
.caps { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.caps i { color: #666; font-style: normal; }
.caps kbd {
  min-width: 40px;
  padding: 8px 10px;
  border: 1px solid #3a3a36;
  border-bottom-width: 4px;
  border-radius: 9px;
  background: #262624;
  color: #f2f1ec;
  font: 600 13px Inter;
  text-align: center;
  transition:
    transform 0.08s ease,
    background-color 0.12s ease,
    border-color 0.12s ease,
    color 0.12s ease;
}
.caps kbd.down { transform: translateY(3px); border-bottom-width: 1px; background: var(--lime); border-color: var(--lime-deep); color: #111; }
.caps kbd.mouse { border-radius: 14px 14px 12px 12px; }
.keys-note { min-height: 1.5em; margin: 22px 0 0; color: var(--lime); font: 600 14px Inter; }
.feat-cta { padding: 90px 0 40px; text-align: center; }
.feat-cta h2 { margin: 0 0 16px; font-size: clamp(34px, 4.4vw, 60px); letter-spacing: -0.05em; }
.feat-cta p { max-width: 520px; margin: 0 auto 28px; color: var(--muted); font-size: 16px; line-height: 1.7; }
.cta-row { display: flex; justify-content: center; align-items: center; gap: 26px; }
@media (max-width: 1100px) {
  .tour { grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: 0 32px; }
  .tour-rail { display: none; }
}
@media (max-width: 820px) {
  .tour { display: flex; flex-direction: column; padding-top: 0; }
  .tour-progress { order: -2; }
  .stage {
    order: -1;
    width: 100%;
    top: 0;
    z-index: 5;
    height: 44vh;
    min-height: 300px;
    margin: 0 0 10px;
    padding-top: 10px;
    background: var(--paper);
  }
  .tour-progress { display: none; }
  .pdf-name { display: none; }
  .pdf-bar { justify-content: space-between; }
  .step { min-height: 62vh; max-width: none; padding: 30px 4px; }
  .art { padding: 18px 20px; font-size: 13px; }
  .art h4 { font-size: 20px; }
  .mini-card,
  .card-player { width: 210px; font-size: 11px; }
  .bar-player { gap: 10px; padding: 10px 12px; }
  .bp-vol,
  .bp-title small { display: none; }
  .pdf-toc { width: 120px; font-size: 10px; }
  .pdf-doc { left: 132px; }
  .pdf-fig,
  .pdf-doc .code { display: none; }
  .bz-grid { grid-template-columns: minmax(0, 1fr); }
  .bz-side { display: none; }
  .rd-view { padding: 12px 12px 0; }
  .rd-card { padding: 18px 18px 20px; font-size: 13px; }
  .rd-site { display: none; }
  .sc-body { gap: 10px; padding: 10px; }
  .sc-photo { padding: 12px 8px 10px 12px; font-size: 8.4px; }
  .sc-h { font-size: 10.5px; }
  .sc-out { padding: 12px; }
  .sc-article { font-size: 11px; }
  .sc-note,
  .sc-file { display: none; }
  .combos { grid-template-columns: 1fr 1fr; }
  .keys { padding: 44px 6%; }
}
@media (max-width: 520px) {
  .combos { grid-template-columns: 1fr; }
  .cta-row { flex-direction: column; }
  .fast-first b { font-size: 46px; }
}
@media (prefers-reduced-motion: reduce) {
  .feat *,
  .feat *::before,
  .feat *::after { animation: none !important; transition: none !important; }
  .mini-card,
  .sel-menu,
  .rd-view,
  .sc-article,
  .card-player { opacity: 1 !important; transform: none !important; }
  .sc-progress { display: none; }
  .bar-player { display: none; }
  .sel { background-size: 100% 100%; }
  .s-read .s1,
  .s-follow .f2 { background: var(--lime); }
}
@media (max-height: 500px) {
  .tour-progress { top: 60px; }
}