:root {
  --bg0: #081018;
  --ink: #e8eef6;
  --muted: #8fa0b5;
  --line: rgba(180, 210, 235, 0.14);
  --accent: #3ec6b8;
  --accent-2: #6ec8ff;
  --panel: rgba(10, 20, 32, 0.78);
  --font-display: 'Space Grotesk', 'Noto Sans SC', sans-serif;
  --font-body: 'Noto Sans SC', 'Space Grotesk', sans-serif;
}

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

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg0);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

a {
  color: var(--accent-2);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(900px 480px at 10% -8%, rgba(62, 198, 184, 0.2), transparent 58%),
    radial-gradient(720px 420px at 92% 6%, rgba(110, 200, 255, 0.14), transparent 55%),
    linear-gradient(165deg, #061018 0%, #0a1520 48%, #08131c 100%);
}

.bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.028) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.5), transparent 72%);
  pointer-events: none;
}

.top {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 1.1rem 1.25rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  box-sizing: border-box;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: inherit;
  text-decoration: none;
  flex: 0 0 auto;
}

.brand img {
  border-radius: 9px;
}

.brand strong {
  display: block;
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 0.01em;
}

.brand small {
  display: block;
  margin-top: 0.05rem;
  color: var(--muted);
  font-size: 0.68rem;
}

.top__nav {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: flex-end;
  gap: 1rem;
  margin-left: auto;
  font-size: 0.82rem;
}

.top__nav a {
  color: var(--muted);
  text-decoration: none;
}

.top__nav a:hover {
  color: var(--ink);
}

.hero {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: clamp(2.8rem, 8vh, 5rem) 1.25rem 1.75rem;
  box-sizing: border-box;
  text-align: left;
  align-self: stretch;
  animation: rise 0.65s ease both;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero__brand {
  margin: 0 0 0.7rem;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3.8vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(105deg, #9ff3e8 0%, #6ec8ff 55%, #d7ecff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 4.2vw, 2.6rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.hero__lead {
  margin: 0.85rem 0 0;
  max-width: 34rem;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.65;
}

.hero__note {
  margin: 0.85rem 0 0;
  max-width: 40rem;
  color: #6f8096;
  font-size: 0.8rem;
  line-height: 1.55;
}

.catalog {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 2.5rem;
  box-sizing: border-box;
  align-self: stretch;
  animation: rise 0.7s ease 0.08s both;
}

.snap-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.snap {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  color: inherit;
  min-width: 0;
}

.snap__frame {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(10, 20, 32, 0.85);
  aspect-ratio: 16 / 10;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.28);
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
}

.snap__frame::after {
  content: '';
  position: absolute;
  inset: -20% -40%;
  background: linear-gradient(
    105deg,
    transparent 36%,
    rgba(255, 255, 255, 0.04) 44%,
    rgba(158, 232, 255, 0.28) 50%,
    rgba(255, 255, 255, 0.06) 56%,
    transparent 64%
  );
  transform: translateX(-55%) skewX(-18deg);
  animation: snap-beam 4.8s ease-in-out infinite;
  pointer-events: none;
  z-index: 2;
}

.snap:nth-child(2) .snap__frame::after {
  animation-delay: 0.55s;
}
.snap:nth-child(3) .snap__frame::after {
  animation-delay: 1.1s;
}
.snap:nth-child(4) .snap__frame::after {
  animation-delay: 1.65s;
}
.snap:nth-child(5) .snap__frame::after {
  animation-delay: 2.2s;
}
.snap:nth-child(6) .snap__frame::after {
  animation-delay: 2.75s;
}
.snap:nth-child(7) .snap__frame::after {
  animation-delay: 3.3s;
}
.snap:nth-child(8) .snap__frame::after {
  animation-delay: 3.85s;
}

@keyframes snap-beam {
  0%,
  18% {
    transform: translateX(-60%) skewX(-18deg);
    opacity: 0;
  }
  28% {
    opacity: 1;
  }
  55% {
    transform: translateX(60%) skewX(-18deg);
    opacity: 0.85;
  }
  68%,
  100% {
    transform: translateX(70%) skewX(-18deg);
    opacity: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .snap__frame::after {
    animation: none;
    display: none;
  }
}

.snap:hover .snap__frame,
.snap:focus-within .snap__frame {
  border-color: rgba(110, 200, 255, 0.35);
  box-shadow: 0 14px 34px rgba(40, 120, 160, 0.22);
  transform: translateY(-2px);
}

.snap__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.snap__overlay {
  position: absolute;
  inset: 0;
  z-index: 3;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.7rem 0.65rem;
  background: rgba(4, 10, 16, 0.82);
  backdrop-filter: blur(6px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s ease;
}

.snap:hover .snap__overlay,
.snap:focus-within .snap__overlay {
  opacity: 1;
  pointer-events: auto;
}

.snap__overlay-title {
  margin: 0 0 0.1rem;
  text-align: center;
  font-size: 0.68rem;
  color: #8fa0b5;
  letter-spacing: 0.04em;
}

.snap__opts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.35rem;
}

.snap__opt {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  min-height: 40px;
  padding: 0.35rem 0.5rem;
  border-radius: 8px;
  border: 1px solid transparent;
  text-decoration: none !important;
  font: inherit;
}

.snap__opt-os {
  font-size: 0.68rem;
  font-weight: 600;
  line-height: 1.2;
}

.snap__opt-state {
  margin-top: 0.12rem;
  font-size: 0.6rem;
  line-height: 1.2;
}

.snap__opt--ready {
  background: linear-gradient(135deg, rgba(62, 198, 184, 0.92), rgba(56, 150, 190, 0.92));
  color: #041018;
  cursor: pointer;
}

.snap__opt--ready:hover {
  filter: brightness(1.06);
}

.snap__opt--soon {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.1);
  color: #9aa8bb;
  cursor: default;
}

.snap__name {
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--ink);
  text-align: center;
  letter-spacing: 0.01em;
}

@media (max-width: 900px) {
  .snap-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 520px) {
  .snap-grid {
    grid-template-columns: 1fr;
  }

  /* 触屏无悬停：默认露出下载层 */
  .snap__overlay {
    opacity: 1;
    pointer-events: auto;
    background: rgba(4, 10, 16, 0.78);
  }
}

@media (max-width: 640px) {
  .top__nav {
    display: none;
  }
}