/* home.css: the home page only. Tokens, buttons, app frames and the clip player live in site.css. */

/*
 * The space between two sections: 120 to 180px on a desktop, 72px on a phone. Each section takes half of it above
 * and below, so the gap between two sections is the whole of it.
 */
:root {
  --home-gap: clamp(120px, 12vw, 180px);
}

/* Display type is the home page's own. The wiki and the download page keep the shared scale in site.css. */
.home h1 {
  max-width: 18ch;
  font-size: clamp(34px, 4.6vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.home h2 {
  max-width: 20ch;
  font-size: clamp(28px, 3.4vw, 46px);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

:lang(zh) .home h1 {
  line-height: 1.15;
}

:lang(zh) .home h2 {
  line-height: 1.25;
}

/* Hero: text on the left, the dragon on the right, then the app. */
.hero {
  padding-block: 56px 0;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  align-items: center;
  gap: clamp(24px, 4vw, 64px);
  padding-bottom: clamp(32px, 5vw, 72px);
}

.hero-copy {
  display: grid;
  justify-items: start;
  gap: 28px;
}

.hero-sub {
  max-width: 48ch;

  font-size: 19px;
  line-height: 1.55;
  color: var(--ink);
}

.hero .file-meta {
  display: none;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 24px;
}

.hero .btn .icon {
  display: none;
}

.hero-link {
  font-size: 17px;
  font-weight: 600;
}

.hero-link a,
.who p > a,
.closer p > a {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  color: var(--accent-text);
}

.hero-art svg {
  width: 100%;
  height: auto;
  max-height: 460px;
  animation: dfloat 7s ease-in-out infinite;
}

.hero-art .eye {
  animation: blink 6s infinite;
  transform-box: fill-box;
  transform-origin: center;
}

@keyframes dfloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes blink {
  0%, 94%, 100% { transform: scaleY(1); }
  97% { transform: scaleY(0.1); }
}

/* The headline arrives a word at a time, once script has split it. Nothing hides without script. */
[data-words][data-revealed] .w {
  display: inline-block;
  animation: word 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
  animation-delay: calc(var(--i) * 70ms);
}

@keyframes word {
  from { transform: translateY(0.5em); }
  to { transform: none; }
}

.closer p {
  margin-inline: auto;
}

/* Download: the button for the visitor's system, and its line. */
.download-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: center;
  gap: 12px;
}

/* Logos: a quiet row of marks. Script shuffles them and starts the loop; the edges fade out by mask, the one gradient allowed. */
.logos {
  padding-block: calc(var(--home-gap) / 3);
}

.marquee {
  overflow: hidden;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}

.marquee-track {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 24px clamp(56px, 8vw, 144px);
  padding-inline: var(--gutter);
}

.marquee-track > span {
  display: inline-grid;
  place-items: center;
  height: clamp(34px, 4vw, 52px);
  color: var(--ink);
}

.marquee-track svg {
  width: auto;
  height: 100%;
  aspect-ratio: 1;
  max-width: none;
}

.marquee-track[data-running] {
  flex-wrap: nowrap;
  justify-content: flex-start;
  width: max-content;
  padding-inline: 0;
  gap: clamp(56px, 8vw, 144px);
  padding-right: clamp(56px, 8vw, 144px);
  animation: drift 60s linear infinite;
}

.marquee-track[data-running] > span {
  flex: none;
}

@keyframes drift {
  to { transform: translateX(-50%); }
}

/* The stage: three sentences pinned while the page scrolls past. Plain lines until script marks it live. */
.stage {
  padding-block: calc(var(--home-gap) / 2);
}

.stage-line {
  max-width: 14ch;
  margin: 0 auto 0.4em;
  font-size: clamp(40px, 7.2vw, 112px);
  line-height: 1;
  font-weight: 800;
  letter-spacing: -0.045em;
  text-align: center;
  text-wrap: balance;
}

.stage-line:last-child {
  margin-bottom: 0;
}

.stage[data-live] {
  height: 300vh;
  padding-block: 0;
}

.stage[data-live] .stage-sticky {
  position: sticky;
  top: 57px;
  display: grid;
  align-items: center;
  height: calc(100vh - 57px);
  height: calc(100svh - 57px);
}

.stage[data-live] .stage-line {
  max-width: 14ch;
  margin: 0 auto;
  grid-area: 1 / 1;
  color: var(--muted);
  transform: translateY(40px) scale(0.96);
  transform-origin: center;
  visibility: hidden;
  transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1), color 0.4s ease;
}

.stage[data-live] .stage-line[data-on] {
  color: var(--ink);
  transform: none;
  visibility: visible;
}

.stage[data-live] .stage-sticky .wrap {
  display: grid;
}

/* Features: one tile of tabs, then the clip of the chosen one. */
.features {
  padding-block: clamp(48px, 7vw, 96px);
}

.features h2 {
  margin-bottom: 40px;
}

.feature {
  display: grid;
  gap: 16px;
}

.feature + .feature {
  margin-top: 64px;
}

.features[data-tabs] .feature + .feature {
  margin-top: 0;
}

.features[data-tabs] .feature[hidden] {
  display: none;
}

/* With tabs, the tab already names the feature, so the heading is for screen readers only. */
.features[data-tabs] .feature-title {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.feature-tabs {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  width: fit-content;
  max-width: 100%;
  margin-bottom: 24px;
  padding: 4px;
  border-radius: 10px;
}

.feature-tabs .ind {
  position: absolute;
  z-index: 0;
  left: 0;
  top: 0;
  width: 0;
  height: 0;
  border-radius: 7px;
  background: var(--accent);
  transition: transform 0.55s cubic-bezier(0.34, 1.45, 0.5, 1), width 0.55s cubic-bezier(0.34, 1.45, 0.5, 1), height 0.3s ease;
}

.feature-tabs:not(.ready) [role="tab"],
.feature-tabs:not(.ready) .ind {
  transition: none;
}

.feature-tabs [role="tab"] {
  position: relative;
  z-index: 1;
  padding: 11px 20px;
  border: 0;
  border-radius: 7px;
  background: none;
  color: var(--muted);
  font: 600 16px/1.3 var(--font-sans);
  cursor: pointer;
  touch-action: manipulation;
  transition: color 0.35s ease;
}

.feature-tabs [role="tab"]:hover {
  color: var(--ink);
}

.feature-tabs [role="tab"][aria-selected="true"] {
  color: var(--accent-ink);
}

.feature-tabs [role="tab"].settled {
  background: var(--accent);
}

/* With tabs, the clip is the whole panel: the line and the link under the title stay for script-less visitors. */
.features[data-tabs] .feature > p,
.features[data-tabs] .feature > a {
  display: none;
}

@media (prefers-reduced-motion: reduce) {
  .feature-tabs .ind {
    transition: none;
  }
}

.feature-title {
  font-size: 28px;
  line-height: 34px;
  font-weight: 500;
  letter-spacing: -0.02em;
}

.feature p {
  font-size: 20px;
  line-height: 30px;
  color: var(--muted);
}

.feature a {
  justify-self: start;
  font-weight: 500;
  color: var(--accent-text);
}

/* The clip takes the full width of the page's wrap, and its frame keeps the 1280 by 800 shape whatever the width. */
.feature .clip {
  margin-top: 8px;
}

.faq .wrap {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: clamp(24px, 4vw, 64px);
  align-items: start;
}

.faq-list {
  max-width: none;
}

@media (max-width: 800px) {
  .faq .wrap {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 960px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }

  .hero-art {
    order: -1;
    max-width: 260px;
  }
}

@media (max-width: 720px) {
  .hero {
    padding-block: 24px 0;
  }

  .hero-copy .hero-buttons {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }

  .hero-copy .download-action,
  .hero-copy .download-row,
  .hero-copy .os-btn-group {
    align-items: stretch;
  }

  .hero-copy .hero-buttons .btn {
    justify-content: center;
  }

  .feature p {
    font-size: 18px;
    line-height: 28px;
  }

  .stage-line {
    max-width: none;
  }

  :root {
    --home-gap: 72px;
  }
}

/* Reduced motion: the dragon stills, the loop becomes a wrapped row, the sentences are plain lines. */
@media (prefers-reduced-motion: reduce) {
  .marquee-track[data-running] {
    flex-wrap: wrap;
    justify-content: center;
    width: auto;
    padding-inline: var(--gutter);
    animation: none;
  }

  .marquee-track > [aria-hidden="true"] {
    display: none;
  }
}

/* One sentence, big, with an icon after each part of it. */
.statement {
  padding-block: clamp(56px, 8vw, 120px);
}

.statement-text {
  max-width: 26ch;
  font-size: clamp(26px, 3.6vw, 50px);
  line-height: 1.15;
  font-weight: 300;
  letter-spacing: -0.03em;
}

.statement-text .icon {
  display: inline-block;
  box-sizing: border-box;
  width: 0.95em;
  height: 0.95em;
  padding: 0.18em;
  margin-inline: 0.06em;
  vertical-align: -0.14em;
  border-radius: 0.24em;
  background: var(--accent);
  color: var(--accent-ink);
}

:lang(zh) .statement-text {
  line-height: 1.3;
}