:root {
  color-scheme: dark;
  --alpha-bg: #07111f;
  --alpha-panel: rgba(13, 24, 39, .86);
  --alpha-panel-strong: rgba(18, 32, 52, .96);
  --alpha-line: rgba(255, 255, 255, .12);
  --alpha-text: #f4f8ff;
  --alpha-muted: #a9b8ca;
  --alpha-blue: #4ed6ff;
  --alpha-pink: #ff6bbf;
  --alpha-green: #72f0b5;
  --alpha-yellow: #ffd66b;
  --alpha-red: #ff8aa1;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    radial-gradient(circle at 18% 12%, rgba(78, 214, 255, .16), transparent 30%),
    radial-gradient(circle at 82% 8%, rgba(255, 107, 191, .14), transparent 28%),
    linear-gradient(180deg, #07111f 0%, #091522 48%, #060c14 100%);
  color: var(--alpha-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif;
  letter-spacing: 0;
}

a { color: inherit; }

.alpha-release-shell {
  width: min(1180px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 28px 0 56px;
}

.alpha-hero {
  min-height: min(680px, calc(100vh - 32px));
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, .64fr);
  gap: 24px;
  align-items: center;
}

.alpha-hero-copy h1 {
  margin: 0;
  max-width: 760px;
  font-size: clamp(42px, 7vw, 82px);
  line-height: .96;
  letter-spacing: 0;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--alpha-blue);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.lead {
  max-width: 740px;
  margin: 20px 0 0;
  color: var(--alpha-muted);
  font-size: clamp(17px, 2.3vw, 22px);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.primary-action,
.secondary-action,
.smart-download,
.text-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 800;
}

.primary-action,
.smart-download {
  background: linear-gradient(135deg, var(--alpha-blue), var(--alpha-pink));
  color: #06101c;
}

.secondary-action {
  border: 1px solid var(--alpha-line);
  background: rgba(255, 255, 255, .06);
  color: var(--alpha-text);
}

.device-card,
.alpha-section {
  border: 1px solid var(--alpha-line);
  background: var(--alpha-panel);
  box-shadow: 0 24px 80px rgba(0, 0, 0, .28);
  backdrop-filter: blur(16px);
}

.device-card {
  padding: 24px;
  border-radius: 18px;
}

.device-kicker,
.device-note {
  color: var(--alpha-muted);
  font-size: 13px;
}

.device-card h2 {
  margin: 6px 0 8px;
  font-size: 28px;
}

.device-card p {
  line-height: 1.7;
}

.smart-download {
  width: 100%;
  margin-top: 14px;
}

.alpha-section {
  margin-top: 18px;
  padding: 24px;
  border-radius: 18px;
}

.status-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.status-strip article {
  padding: 16px;
  border-radius: 12px;
  background: rgba(255, 255, 255, .05);
}

.status-strip strong,
.status-strip span {
  display: block;
}

.status-strip span {
  margin-top: 6px;
  color: var(--alpha-muted);
  line-height: 1.6;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, .84fr) minmax(0, 1.16fr);
  gap: 20px;
}

h2 {
  margin: 0;
  font-size: clamp(24px, 3vw, 34px);
  letter-spacing: 0;
}

.alpha-section p {
  color: var(--alpha-muted);
  line-height: 1.8;
}

.download-panel,
.app-link-grid,
.checklist-grid {
  display: grid;
  gap: 12px;
}

.download-card,
.app-link-card,
.check-card {
  padding: 16px;
  border: 1px solid var(--alpha-line);
  border-radius: 12px;
  background: rgba(255, 255, 255, .055);
}

.download-card.recommended {
  border-color: rgba(78, 214, 255, .55);
  background: rgba(78, 214, 255, .09);
}

.download-head,
.section-head,
.check-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.download-title,
.app-link-title,
.check-title {
  font-weight: 900;
}

.download-meta,
.app-link-card p,
.check-card p {
  margin: 8px 0 0;
  color: var(--alpha-muted);
  line-height: 1.7;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .08);
  color: var(--alpha-muted);
  font-size: 12px;
  font-weight: 800;
  white-space: nowrap;
}

.badge.ready { color: var(--alpha-green); }
.badge.required { color: var(--alpha-yellow); }
.badge.blocked { color: var(--alpha-red); }
.badge.planned { color: var(--alpha-blue); }

.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.download-actions a {
  min-height: 38px;
  padding: 0 12px;
  border-radius: 9px;
  border: 1px solid var(--alpha-line);
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  font-weight: 800;
}

.download-actions a:first-child {
  background: var(--alpha-text);
  color: #08111f;
}

.download-actions .disabled {
  color: var(--alpha-muted);
  pointer-events: none;
  opacity: .62;
}

.app-link-grid {
  grid-template-columns: repeat(3, 1fr);
}

.app-link-card {
  min-height: 148px;
  text-decoration: none;
}

.instruction-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
  counter-reset: instruction;
}

.instruction-list li {
  counter-increment: instruction;
  position: relative;
  padding: 14px 14px 14px 52px;
  border: 1px solid var(--alpha-line);
  border-radius: 12px;
  background: rgba(255, 255, 255, .055);
  line-height: 1.7;
}

.instruction-list li::before {
  content: counter(instruction);
  position: absolute;
  left: 14px;
  top: 14px;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--alpha-blue), var(--alpha-pink));
  color: #06101c;
  font-weight: 900;
}

.checklist-grid {
  grid-template-columns: repeat(3, 1fr);
}

.warning-section {
  background: rgba(255, 214, 107, .08);
}

.legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.legal-links a,
.text-link {
  color: var(--alpha-blue);
  border: 1px solid rgba(78, 214, 255, .28);
  background: rgba(78, 214, 255, .06);
}

.share-message {
  min-height: 180px;
  margin: 0;
  white-space: pre-wrap;
  color: var(--alpha-text);
  line-height: 1.8;
  font-family: inherit;
}

.copy-share {
  width: 100%;
  min-height: 42px;
  margin-top: 14px;
  border: 0;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--alpha-blue), var(--alpha-pink));
  color: #06101c;
  font-weight: 900;
  cursor: pointer;
}

.loading-line {
  color: var(--alpha-muted);
}

@media (max-width: 900px) {
  .alpha-release-shell {
    width: min(100% - 20px, 720px);
    padding-top: 14px;
  }

  .alpha-hero,
  .split,
  .status-strip,
  .app-link-grid,
  .checklist-grid {
    grid-template-columns: 1fr;
  }

  .alpha-hero {
    min-height: auto;
    padding-top: 32px;
  }

  .section-head {
    align-items: stretch;
    flex-direction: column;
  }
}