:root {
  color-scheme: dark;
  --cloud: #050505;
  --surface: #0a0a09;
  --ink: #f5f5f1;
  --muted: #aaa9a2;
  --faint: #71716c;
  --line: #30302d;
  --grid: rgb(245 245 241 / 0.12);
  --grid-strong: rgb(245 245 241 / 0.2);
  --focus: #ffffff;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--cloud);
}

body {
  min-width: 320px;
  min-height: 100svh;
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background:
    radial-gradient(circle at 76% 43%, #151513 0, var(--cloud) 46%),
    var(--cloud);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 5px;
}

.skip-link {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 100;
  padding: 0.7rem 1rem;
  color: var(--cloud);
  background: var(--ink);
  font-size: 0.75rem;
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: translateY(0);
}

.hero {
  position: relative;
  isolation: isolate;
  display: grid;
  width: min(100%, 100rem);
  min-height: 100svh;
  margin: 0 auto;
  overflow: hidden;
  grid-template-rows: auto minmax(0, 1fr) auto;
}

.hero::before {
  position: absolute;
  inset: -20%;
  z-index: -2;
  content: "";
  pointer-events: none;
  background:
    radial-gradient(circle at 76% 44%, rgb(255 255 255 / 0.065), transparent 26%),
    radial-gradient(circle at 72% 48%, rgb(255 255 255 / 0.025), transparent 48%);
}

.site-header,
.site-footer {
  position: relative;
  z-index: 5;
  display: flex;
  padding-right: clamp(1.25rem, 4vw, 4.5rem);
  padding-left: clamp(1.25rem, 4vw, 4.5rem);
  align-items: center;
  justify-content: space-between;
}

.site-header {
  min-height: clamp(4.75rem, 9vh, 6.5rem);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--ink);
  font-size: 1.03rem;
  font-weight: 650;
  letter-spacing: -0.025em;
  text-decoration: none;
}

.brand img {
  display: block;
  border-radius: 0.7rem;
  filter: grayscale(1) brightness(1.08);
}

.platform {
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 590;
  letter-spacing: 0.02em;
}

.hero-stage {
  display: grid;
  min-height: 0;
  grid-template-columns: minmax(0, 1.08fr) minmax(24rem, 0.92fr);
  align-items: center;
}

.hero-copy {
  position: relative;
  z-index: 4;
  max-width: 52rem;
  padding: clamp(2.25rem, 5vh, 4.5rem) clamp(1.25rem, 4vw, 4.5rem);
  animation: copy-in 900ms 100ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

h1 {
  max-width: 8.8ch;
  margin: 0;
  font-family: "SF Pro Display", -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  font-size: clamp(4.35rem, 7.45vw, 7.9rem);
  font-weight: 570;
  letter-spacing: -0.07em;
  line-height: 0.88;
}

h1 span {
  display: block;
}

h1 span:last-child {
  color: var(--muted);
  font-weight: 330;
  letter-spacing: -0.06em;
}

.intro {
  max-width: 35rem;
  margin: clamp(2rem, 4.5vh, 3.5rem) 0 0;
  color: var(--muted);
  font-size: clamp(0.96rem, 1.2vw, 1.08rem);
  letter-spacing: -0.012em;
  line-height: 1.65;
}

.availability {
  display: flex;
  margin-top: clamp(1.75rem, 4vh, 2.75rem);
  align-items: center;
  gap: 1rem 1.25rem;
  flex-wrap: wrap;
}

.download-status {
  display: inline-flex;
  min-height: 3.45rem;
  padding: 0 1.55rem;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--ink);
  border-radius: 999px;
  color: var(--cloud);
  background: var(--ink);
  box-shadow:
    0 0 0 1px rgb(255 255 255 / 0.08),
    0 0.85rem 3rem rgb(255 255 255 / 0.08);
  font-size: 1rem;
  font-weight: 680;
  letter-spacing: -0.005em;
  cursor: not-allowed;
  user-select: none;
}

.compatibility {
  color: var(--faint);
  font-size: 0.69rem;
  letter-spacing: 0.01em;
}

.hero-art {
  position: relative;
  z-index: 1;
  display: grid;
  width: 100%;
  height: 100%;
  min-height: 34rem;
  place-items: center;
  animation: art-in 1100ms 150ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.sudoku-grid {
  position: absolute;
  inset: 3% -18% 0 -35%;
  z-index: -2;
  background-image:
    linear-gradient(to right, var(--grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid) 1px, transparent 1px),
    linear-gradient(to right, var(--grid-strong) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-strong) 1px, transparent 1px);
  background-position: center;
  background-size:
    clamp(3.75rem, 5vw, 5.4rem) clamp(3.75rem, 5vw, 5.4rem),
    clamp(3.75rem, 5vw, 5.4rem) clamp(3.75rem, 5vw, 5.4rem),
    clamp(11.25rem, 15vw, 16.2rem) clamp(11.25rem, 15vw, 16.2rem),
    clamp(11.25rem, 15vw, 16.2rem) clamp(11.25rem, 15vw, 16.2rem);
  opacity: 0.62;
  -webkit-mask-image: radial-gradient(ellipse 54% 48% at 58% 49%, black 0%, rgb(0 0 0 / 0.9) 40%, transparent 100%);
  mask-image: radial-gradient(ellipse 54% 48% at 58% 49%, black 0%, rgb(0 0 0 / 0.9) 40%, transparent 100%);
  animation: grid-drift 18s linear infinite;
}

.halo {
  position: absolute;
  z-index: -1;
  width: min(36vw, 34rem);
  aspect-ratio: 0.72;
  border-radius: 50%;
  background: radial-gradient(ellipse, rgb(255 255 255 / 0.14) 0%, rgb(255 255 255 / 0.035) 42%, transparent 72%);
  filter: blur(1.25rem);
  animation: halo-breathe 6s ease-in-out infinite;
}

.knight {
  position: relative;
  z-index: 2;
  display: block;
  width: min(39vw, 34rem);
  max-height: min(74vh, 49rem);
  object-fit: contain;
  filter: drop-shadow(0 2.5rem 3.5rem rgb(0 0 0 / 0.55));
  transform-origin: 54% 72%;
  animation: knight-float 7s 1.1s ease-in-out infinite;
  will-change: transform;
}

.site-footer {
  min-height: clamp(4.75rem, 9vh, 6rem);
  padding-bottom: 0.35rem;
  color: var(--faint);
  font-size: 0.7rem;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: clamp(1.1rem, 2.5vw, 2.4rem);
}

.support-link {
  display: inline-flex;
  padding: 0.45rem 0;
  align-items: center;
  gap: 0.45rem;
  color: var(--muted);
  text-decoration-color: transparent;
  text-underline-offset: 0.3rem;
  transition:
    color 180ms ease,
    text-decoration-color 180ms ease;
}

.support-link:hover {
  color: var(--ink);
  text-decoration-color: currentColor;
}

@keyframes copy-in {
  from {
    opacity: 0;
    transform: translateY(1.4rem);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes art-in {
  from {
    opacity: 0;
    transform: scale(0.94) translateY(1.5rem);
  }

  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

@keyframes knight-float {
  0%,
  100% {
    transform: translate3d(0, 0.3rem, 0) rotate(-0.35deg);
  }

  50% {
    transform: translate3d(0, -0.7rem, 0) rotate(0.55deg);
  }
}

@keyframes grid-drift {
  from {
    background-position: center center;
  }

  to {
    background-position: calc(50% + 5.4rem) calc(50% + 5.4rem);
  }
}

@keyframes halo-breathe {
  0%,
  100% {
    opacity: 0.7;
    transform: scale(0.96);
  }

  50% {
    opacity: 1;
    transform: scale(1.04);
  }
}

@media (max-width: 980px) {
  .hero-stage {
    grid-template-columns: minmax(0, 1.04fr) minmax(19rem, 0.96fr);
  }

  h1 {
    font-size: clamp(4.15rem, 8.8vw, 6rem);
  }

  .knight {
    width: min(45vw, 29rem);
  }
}

@media (max-width: 720px) {
  body {
    background:
      radial-gradient(circle at 70% 51%, #151513 0, var(--cloud) 42%),
      var(--cloud);
  }

  .hero {
    min-height: max(100svh, 54rem);
    overflow: hidden;
  }

  .site-header,
  .site-footer {
    padding-right: 1.25rem;
    padding-left: 1.25rem;
  }

  .site-header {
    min-height: 4.75rem;
  }

  .platform {
    display: none;
  }

  .hero-stage {
    display: grid;
    padding: 2rem 1.25rem 2.5rem;
    grid-template-areas:
      "title"
      "art"
      "intro"
      "availability";
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto minmax(19rem, 38vh) auto auto;
    align-items: start;
  }

  .hero-copy {
    display: contents;
  }

  h1 {
    grid-area: title;
    max-width: 8.3ch;
    font-size: clamp(3.75rem, 16vw, 5.35rem);
    line-height: 0.89;
  }

  .intro {
    z-index: 3;
    grid-area: intro;
    margin-top: 1.25rem;
    font-size: 0.95rem;
  }

  .availability {
    z-index: 3;
    grid-area: availability;
    margin-top: 1.5rem;
    align-items: flex-start;
    flex-direction: column;
  }

  .download-status {
    width: 100%;
  }

  .hero-art {
    grid-area: art;
    min-height: 0;
    margin: -2rem -1.25rem -2.5rem;
  }

  .sudoku-grid {
    inset: -18% -18% -12%;
    -webkit-mask-image: radial-gradient(ellipse 57% 44% at 58% 52%, black 0%, rgb(0 0 0 / 0.9) 35%, transparent 100%);
    mask-image: radial-gradient(ellipse 57% 44% at 58% 52%, black 0%, rgb(0 0 0 / 0.9) 35%, transparent 100%);
  }

  .halo {
    width: min(76vw, 21rem);
  }

  .knight {
    width: min(63vw, 18.5rem);
    max-height: 24rem;
    transform: translateX(8%);
  }

  .site-footer {
    min-height: 4.75rem;
    padding-bottom: 0.5rem;
    gap: 0 1rem;
    flex-wrap: wrap;
  }

  .footer-links {
    flex-shrink: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}