:root {
  --bg-0: #070a14;
  --bg-1: #0f1733;
  --surface: rgba(14, 20, 44, 0.62);
  --surface-border: rgba(145, 176, 255, 0.24);
  --text: #f4f7ff;
  --muted: #b6c2e3;
  --accent: #61a4ff;
  --accent-2: #67f2c5;
}

* {
  box-sizing: border-box;
}

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

body {
  font-family: "Sora", system-ui, sans-serif;
  color: var(--text);
  background:
    radial-gradient(
      80rem 50rem at 2% -5%,
      rgba(79, 125, 255, 0.28),
      transparent 55%
    ),
    radial-gradient(
      65rem 40rem at 100% -10%,
      rgba(70, 225, 183, 0.18),
      transparent 58%
    ),
    linear-gradient(180deg, var(--bg-0), var(--bg-1));
  overflow-x: hidden;
}

.bg-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
}

.orb {
  position: absolute;
  border-radius: 999px;
  filter: blur(32px);
}

.orb-a {
  width: min(36vw, 28rem);
  height: min(36vw, 28rem);
  background: rgba(65, 124, 255, 0.25);
  top: 8%;
  left: -8%;
  animation: float-a 11s ease-in-out infinite;
}

.orb-b {
  width: min(28vw, 22rem);
  height: min(28vw, 22rem);
  background: rgba(78, 242, 196, 0.18);
  top: 2%;
  right: -4%;
  animation: float-b 13s ease-in-out infinite;
}

.grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 30px 30px;
  mask-image: radial-gradient(circle at center, #000 35%, transparent 100%);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem max(1rem, 3vw);
  backdrop-filter: blur(9px);
  background: rgba(6, 9, 20, 0.55);
  border-bottom: 1px solid rgba(255, 255, 255, 0.09);
}

.brand {
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.015em;
}

.container {
  max-width: 72rem;
  margin: 0 auto;
  padding: 2rem max(1rem, 3vw) 4rem;
}

.hero {
  text-align: center;
  padding: clamp(2rem, 6vw, 4rem) 0;
}

.kicker {
  margin: 0 0 1rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: #9dc1ff;
}

.hero h1 {
  margin: 0 auto;
  max-width: 56rem;
  font-size: clamp(2rem, 6vw, 4.1rem);
  line-height: 1.03;
  letter-spacing: -0.02em;
}

.lead {
  margin: 1.4rem auto 2rem;
  max-width: 42rem;
  color: var(--muted);
  line-height: 1.7;
  font-size: clamp(1rem, 2.4vw, 1.2rem);
}

.features {
  padding-bottom: 1.5rem;
}

.section-head p {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.11em;
  font-size: 0.74rem;
  color: #95f7d7;
}

.section-head h2 {
  margin: 0.8rem 0 1.3rem;
  max-width: 38rem;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 0.9rem;
}

.feature-card {
  grid-column: span 6;
  background: linear-gradient(
    165deg,
    rgba(31, 45, 91, 0.42),
    rgba(17, 24, 50, 0.74)
  );
  border: 1px solid var(--surface-border);
  border-radius: 1rem;
  padding: 1.1rem 1rem;
  transition:
    transform 260ms ease,
    border-color 260ms ease,
    box-shadow 260ms ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(160, 205, 255, 0.55);
  box-shadow: 0 16px 30px rgba(5, 8, 20, 0.28);
}

.feature-card h3 {
  margin: 0 0 0.55rem;
  font-size: 1rem;
}

.feature-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
  font-size: 0.95rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  text-decoration: none;
  border: 1px solid transparent;
  transition:
    transform 180ms ease,
    filter 180ms ease,
    border-color 180ms ease;
}

.btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.04);
}

.btn-primary {
  min-width: 14rem;
  padding: 0.85rem 1.3rem;
  font-weight: 600;
  color: #07122b;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}

.btn-ghost {
  color: var(--text);
  font-size: 0.88rem;
  padding: 0.56rem 0.9rem;
  border-color: rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.04);
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
}

.reveal.visible {
  animation: reveal 560ms cubic-bezier(0.2, 1, 0.34, 1) forwards;
}

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

@keyframes float-a {
  0%,
  100% {
    transform: translateY(0) scale(1);
  }
  50% {
    transform: translateY(14px) scale(1.03);
  }
}

@keyframes float-b {
  0%,
  100% {
    transform: translateY(0) scale(1);
  }
  50% {
    transform: translateY(-10px) scale(1.05);
  }
}

@media (max-width: 860px) {
  .feature-card {
    grid-column: span 12;
  }

  .container {
    padding-top: 1.3rem;
  }
}

.download-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-top: 2rem;
}

.version-list {
  margin-top: 4rem;
  text-align: left;
  max-width: 48rem;
  margin-left: auto;
  margin-right: auto;
}

.version-list h3 {
  border-bottom: 1px solid var(--surface-border);
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
  color: var(--accent);
}

.version-list ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.version-list li {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 0.8rem;
}

.version-list .v-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.8rem;
}

.version-list .v-title {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
}

.version-list .v-date {
  font-size: 0.85rem;
  color: var(--muted);
}

.version-list .v-files {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.version-list .v-link {
  font-size: 0.9rem;
  color: var(--accent);
  text-decoration: none;
  background: rgba(97, 164, 255, 0.1);
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
  transition: background 0.2s;
}

.version-list .v-link:hover {
  background: rgba(97, 164, 255, 0.2);
}

.hidden {
  display: none;
}