:root {
  --bg: #f8fafc;
  --bg-elevated: #ffffff;
  --text: #0f172a;
  --text-muted: #64748b;
  --accent: #4f46e5;
  --accent-dim: rgba(79, 70, 229, 0.1);
  --border: rgba(15, 23, 42, 0.08);
  --ok: #059669;
  --font: Inter, system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html, body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: var(--font);
  max-width: 100vw;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }

.dl-wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 112px 20px 96px;
}
.dl-kicker {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}
.dl-wrap h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.03em;
  line-height: 1.08;
  margin: 0 0 14px;
}
.dl-lead {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 54ch;
  margin: 0 0 28px;
  line-height: 1.55;
}

.dl-primary {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-bottom: 40px;
}
.dl-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  background: var(--accent);
  color: #fff;
}
.dl-btn:hover { filter: brightness(1.08); }
.dl-btn-ghost {
  background: #fff;
  color: var(--text);
  border-color: var(--border);
}
.dl-btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.dl-btn[hidden] { display: none; }
.dl-hint {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.dl-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.dl-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 22px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.dl-card.is-detected {
  border-color: rgba(79, 70, 229, 0.45);
  box-shadow: 0 0 0 4px var(--accent-dim);
}
.dl-os {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.dl-card h2 {
  font-size: 1.25rem;
  margin: 0;
  letter-spacing: -0.02em;
}
.dl-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.5;
  flex: 1;
}
.dl-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  word-break: break-all;
}
.dl-badge {
  display: none;
  align-self: flex-start;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 3px 8px;
  border-radius: 999px;
}
.dl-card.is-detected .dl-badge { display: inline-block; }

.dl-section {
  margin-top: 56px;
}
.dl-section h2 {
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  margin: 0 0 12px;
}
.dl-section p, .dl-section li {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.55;
}
.dl-steps {
  margin: 0;
  padding-left: 1.2rem;
}
.dl-steps li { margin: 8px 0; }
.dl-note {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 18px;
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.5;
}

@media (max-width: 860px) {
  .dl-grid { grid-template-columns: 1fr; }
  .dl-wrap { padding-top: 96px; }
}