:root {
  color-scheme: light;
  --bg: #f4f5f7;
  --surface: rgba(255, 255, 255, 0.82);
  --surface-strong: rgba(255, 255, 255, 0.94);
  --line: rgba(15, 23, 42, 0.08);
  --text: #101828;
  --muted: #5f6b7a;
  --accent: #0f172a;
  --accent-soft: #eef2f7;
  --glow-a: rgba(63, 115, 255, 0.18);
  --glow-b: rgba(73, 212, 255, 0.15);
  --shadow: 0 30px 80px rgba(15, 23, 42, 0.12);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --max-width: 1180px;
  --font-display: "SF Pro Display", "PingFang SC", "Helvetica Neue", sans-serif;
  --font-body: "SF Pro Text", "PingFang SC", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.92), rgba(255, 255, 255, 0.68) 28%, transparent 52%),
    linear-gradient(180deg, #fbfcfe 0%, #f3f5f8 52%, #eef2f6 100%);
  color: var(--text);
  font-family: var(--font-body);
}

body {
  position: relative;
  overflow-x: hidden;
}

.page-shell {
  position: relative;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 24px 72px;
}

.ambient {
  position: fixed;
  width: 480px;
  height: 480px;
  border-radius: 50%;
  filter: blur(96px);
  z-index: 0;
  pointer-events: none;
}

.ambient-a {
  top: -120px;
  left: -160px;
  background: var(--glow-a);
}

.ambient-b {
  top: 180px;
  right: -180px;
  background: var(--glow-b);
}

.hero,
.content {
  position: relative;
  z-index: 1;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 420px);
  gap: 28px;
  align-items: stretch;
  padding-top: 28px;
}

.hero-copy,
.hero-card,
.feature-card,
.panel,
.specs {
  backdrop-filter: blur(18px);
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.hero-copy {
  border-radius: var(--radius-xl);
  padding: 42px 42px 36px;
}

.hero-card {
  border-radius: var(--radius-xl);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-size: 12px;
  font-weight: 600;
}

h1,
h2 {
  margin: 0;
  font-family: var(--font-display);
  letter-spacing: -0.04em;
}

h1 {
  font-size: clamp(40px, 5vw, 68px);
  line-height: 0.96;
}

h2 {
  font-size: clamp(26px, 3vw, 34px);
  line-height: 1.05;
}

.hero-text,
.feature-card p,
.release-summary,
.download-card p,
.notes p,
.spec-grid span,
.hero-meta {
  color: var(--muted);
}

.hero-text {
  max-width: 620px;
  margin: 22px 0 0;
  font-size: 17px;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.primary-btn,
.secondary-btn,
.inline-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 14px 22px;
  text-decoration: none;
  transition:
    transform 160ms ease,
    box-shadow 160ms ease,
    background-color 160ms ease;
}

.primary-btn {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.24);
}

.secondary-btn,
.inline-link {
  background: var(--accent-soft);
  color: var(--accent);
}

.primary-btn:hover,
.secondary-btn:hover,
.inline-link:hover {
  transform: translateY(-1px);
}

.hero-meta {
  margin-top: 16px;
  font-size: 14px;
}

.hero-card-head {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 14px;
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: linear-gradient(135deg, #3f83ff 0%, #40d6ff 100%);
  box-shadow: 0 0 0 6px rgba(63, 131, 255, 0.12);
}

.release-version {
  margin-top: 18px;
  font-family: var(--font-display);
  font-size: 44px;
  letter-spacing: -0.05em;
}

.release-summary {
  margin: 12px 0 0;
  line-height: 1.7;
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 28px 0 0;
}

.meta-grid div {
  padding: 16px;
  border-radius: var(--radius-md);
  background: var(--surface-strong);
  border: 1px solid rgba(15, 23, 42, 0.05);
}

.meta-grid dt {
  color: var(--muted);
  font-size: 13px;
}

.meta-grid dd {
  margin: 10px 0 0;
  font-size: 18px;
  font-weight: 600;
}

.content {
  display: grid;
  gap: 28px;
  margin-top: 28px;
}

.feature-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.feature-card {
  border-radius: var(--radius-lg);
  padding: 28px;
}

.feature-card p {
  margin: 16px 0 0;
  line-height: 1.75;
}

.details-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  gap: 20px;
}

.panel {
  border-radius: var(--radius-lg);
  padding: 28px;
}

.panel-head {
  margin-bottom: 18px;
}

.notes {
  display: grid;
  gap: 12px;
}

.notes p {
  margin: 0;
  padding: 14px 16px;
  border-radius: 14px;
  background: var(--surface-strong);
  border: 1px solid rgba(15, 23, 42, 0.05);
  line-height: 1.7;
}

.download-stack {
  display: grid;
  gap: 14px;
}

.download-card,
.checksum-card {
  display: grid;
  gap: 10px;
  padding: 18px;
  border-radius: var(--radius-md);
  background: var(--surface-strong);
  border: 1px solid rgba(15, 23, 42, 0.05);
}

.download-card {
  align-items: start;
}

.download-card strong {
  font-size: 16px;
}

.download-card p {
  margin: 6px 0 0;
  line-height: 1.6;
}

.inline-link {
  justify-self: start;
  padding: 11px 18px;
  font-size: 14px;
}

.checksum-card span {
  color: var(--muted);
  font-size: 13px;
}

.checksum-card code {
  font-size: 12px;
  line-height: 1.6;
  word-break: break-all;
}

.specs {
  border-radius: var(--radius-xl);
  padding: 32px;
}

.specs-head {
  margin-bottom: 22px;
}

.spec-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.spec-grid div {
  padding: 18px;
  border-radius: var(--radius-md);
  background: var(--surface-strong);
  border: 1px solid rgba(15, 23, 42, 0.05);
}

.spec-grid span {
  display: block;
  font-size: 13px;
}

.spec-grid strong {
  display: block;
  margin-top: 10px;
  font-size: 18px;
  line-height: 1.5;
}

@media (max-width: 980px) {
  .hero,
  .details-grid,
  .feature-row,
  .spec-grid {
    grid-template-columns: 1fr;
  }

  .hero-copy,
  .hero-card,
  .feature-card,
  .panel,
  .specs {
    padding: 24px;
  }
}

@media (max-width: 640px) {
  .page-shell {
    padding: 20px 14px 48px;
  }

  h1 {
    font-size: 40px;
  }

  .meta-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: column;
  }

  .primary-btn,
  .secondary-btn,
  .inline-link {
    width: 100%;
  }
}