:root {
  color-scheme: dark;
  --bg: #050510;
  --panel: rgba(16, 26, 46, 0.72);
  --accent: #6cf9ff;
  --accent-strong: #00d7ff;
  --text: #f0f7ff;
  --muted: #9bb3c9;
  --border: rgba(108, 249, 255, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background: radial-gradient(circle at top left, rgba(0, 215, 255, 0.18), transparent 55%),
    radial-gradient(circle at bottom right, rgba(76, 57, 255, 0.18), transparent 55%),
    var(--bg);
  color: var(--text);
  line-height: 1.55;
  padding: 48px 20px 64px;
}

main {
  max-width: 1080px;
  margin: 0 auto;
}

header {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 36px;
}

header h1 {
  margin: 0;
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  letter-spacing: 0.05em;
}

header .subtitle {
  font-size: 18px;
  color: var(--muted);
}

.back-link {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  border-radius: 12px;
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--accent);
  font-weight: 600;
  background: rgba(12, 18, 36, 0.45);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.back-link:hover,
.back-link:focus {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 215, 255, 0.15);
}

section {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 24px;
  margin-bottom: 28px;
  backdrop-filter: blur(16px);
  box-shadow: 0 14px 45px rgba(6, 12, 30, 0.35);
}

section h2 {
  margin-top: 0;
  font-size: 24px;
  letter-spacing: 0.04em;
  color: var(--accent);
}

section h3 {
  margin-bottom: 12px;
  color: var(--accent-strong);
  font-size: 18px;
}

.grid {
  display: grid;
  gap: 18px;
}

@media (min-width: 880px) {
  .grid.two-column {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
  font-size: 15px;
}

table th,
table td {
  border: 1px solid rgba(108, 249, 255, 0.25);
  padding: 10px 12px;
  text-align: left;
}

table th {
  background: rgba(108, 249, 255, 0.12);
  color: var(--accent);
  font-weight: 600;
}

table td strong {
  color: var(--accent-strong);
}

code {
  font-family: "JetBrains Mono", "Fira Code", monospace;
  background: rgba(12, 18, 36, 0.75);
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 14px;
}

ul, ol {
  margin: 0 0 12px 20px;
}

.tag {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: rgba(108, 249, 255, 0.18);
  color: var(--accent);
  border: 1px solid rgba(108, 249, 255, 0.35);
}

.checklist {
  display: grid;
  gap: 10px;
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
}

.checklist li {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid rgba(108, 249, 255, 0.25);
  background: rgba(8, 14, 28, 0.55);
}

.checklist li .status {
  font-size: 18px;
}

.note {
  margin-top: 12px;
  font-size: 14px;
  color: var(--muted);
}

.details-grid {
  display: grid;
  gap: 12px;
}

@media (min-width: 720px) {
  .details-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

footer {
  margin-top: 36px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}

footer a {
  color: var(--accent);
}