:root {
  color-scheme: dark;
  font-family: "Inter", "Segoe UI", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: #e8ecff;
  background: #080b1a;
  min-height: 100vh;
}

.background {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(1200px 800px at 15% -10%, rgba(90, 125, 255, 0.35), transparent 55%),
    radial-gradient(1000px 700px at 100% 10%, rgba(53, 219, 255, 0.2), transparent 55%),
    linear-gradient(180deg, #0c1022 0%, #080b1a 100%);
  z-index: -1;
}

.shell {
  width: min(1080px, calc(100% - 2rem));
  margin: 1.75rem auto 2.5rem;
  display: grid;
  gap: 1rem;
}

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.glass {
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.15),
    rgba(255, 255, 255, 0.08) 38%,
    rgba(255, 255, 255, 0.03)
  );
  box-shadow:
    0 20px 45px rgba(0, 0, 0, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(14px) saturate(130%);
  border-radius: 20px;
  padding: 1rem 1.25rem;
}

.brand {
  font-weight: 650;
  letter-spacing: 0.2px;
}

.lang-switch {
  display: flex;
  gap: 0.45rem;
}

.lang {
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #eef2ff;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
  font-weight: 600;
  cursor: pointer;
}

.lang.active {
  background: rgba(118, 146, 255, 0.42);
  border-color: rgba(157, 179, 255, 0.72);
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  line-height: 1.2;
}

.hero p {
  margin: 0.9rem 0 0;
  max-width: 70ch;
  opacity: 0.92;
}

.downloads h2,
.instructions h2 {
  margin: 0 0 1rem;
  font-size: 1.25rem;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.card {
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.05);
  padding: 1rem;
}

.card h3 {
  margin: 0;
  font-size: 1.04rem;
}

.card p {
  margin: 0.65rem 0 0.85rem;
  opacity: 0.88;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.4rem;
  border-radius: 12px;
  color: #ffffff;
  text-decoration: none;
  font-weight: 630;
  background: linear-gradient(180deg, rgba(124, 155, 255, 0.94), rgba(91, 125, 255, 0.92));
  border: 1px solid rgba(182, 200, 255, 0.45);
  padding: 0.35rem 0.9rem;
}

.btn.secondary {
  background: linear-gradient(180deg, rgba(118, 228, 255, 0.78), rgba(69, 200, 255, 0.72));
  border-color: rgba(173, 238, 255, 0.45);
}

.btn.disabled {
  pointer-events: none;
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  color: rgba(255, 255, 255, 0.6);
}

.file-name {
  display: block;
  margin-top: 0.75rem;
  color: rgba(233, 239, 255, 0.74);
  font-size: 0.83rem;
  word-break: break-word;
}

.meta {
  margin: 1rem 0 0;
  font-size: 0.92rem;
  color: rgba(233, 239, 255, 0.8);
}

.instructions ol {
  margin: 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.45rem;
}

@media (max-width: 640px) {
  .shell {
    width: min(1080px, calc(100% - 1rem));
    margin-top: 1rem;
  }
}