/* ── Half-Life palette ─────────────────────────── */
:root {
  --hl-orange: #F78100;
  --hl-orange-bright: #FFA022;
  --hl-amber: #FFB000;
  --hl-yellow: #F5E82E;
  --hl-dim: #8C5A14;
  --hl-text: #DCDCD2;
  --hl-text-muted: #9A9A8E;
  --hl-bg: #0C0A08;
  --hl-bg-panel: #161310;
  --hl-bg-card: #1C1814;
  --hl-border: #3A2A10;
  --hl-border-hot: #F78100;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: var(--hl-bg);
  color: var(--hl-text);
  font-family: "Share Tech Mono", ui-monospace, "Cascadia Mono", "Consolas", Menlo, monospace;
  font-size: 15px;
  line-height: 1.55;
  min-height: 100vh;
}

body {
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(247, 129, 0, 0.12), transparent 70%),
    radial-gradient(ellipse 60% 40% at 100% 100%, rgba(255, 176, 0, 0.05), transparent 70%),
    var(--hl-bg);
}

#hud-grid {
  position: fixed;
  top: 0; left: 0;
  width: 100vw; height: 100vh;
  z-index: 0;
  pointer-events: none;
}

a { color: var(--hl-amber); text-decoration: none; }
a:hover { color: var(--hl-orange-bright); text-decoration: underline; }

code, pre { font-family: inherit; }

/* ── Hero ─────────────────────────────────────── */
.hero {
  position: relative;
  z-index: 1;
  border-bottom: 2px solid var(--hl-border-hot);
  padding: 64px 24px 48px;
  background:
    linear-gradient(180deg, rgba(247, 129, 0, 0.08), transparent 80%),
    linear-gradient(180deg, rgba(22, 19, 16, 0.6), transparent);
}

.hero-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
}

.lambda svg {
  width: 96px;
  height: 96px;
  filter: drop-shadow(0 0 12px rgba(247, 129, 0, 0.6));
}

.title-block h1 {
  font-size: 56px;
  letter-spacing: 8px;
  color: var(--hl-orange);
  text-shadow: 0 0 24px rgba(247, 129, 0, 0.4);
  font-weight: 900;
}

.title-block .subtitle {
  color: var(--hl-amber);
  margin-top: 4px;
  font-size: 14px;
  letter-spacing: 2px;
  text-transform: uppercase;
}

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

.badge {
  background: var(--hl-bg-panel);
  border: 1px solid var(--hl-border);
  color: var(--hl-amber);
  padding: 3px 10px;
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

/* ── Sections ─────────────────────────────────── */
section {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
  padding: 48px 24px;
}

h2 {
  color: var(--hl-orange);
  font-size: 22px;
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-bottom: 20px;
  border-bottom: 1px dashed var(--hl-border);
  padding-bottom: 8px;
}

h3 {
  color: var(--hl-amber);
  font-size: 16px;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.section-intro {
  color: var(--hl-text-muted);
  margin-bottom: 24px;
  font-size: 14px;
}

/* ── Download cards ───────────────────────────── */
.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.card {
  background: var(--hl-bg-card);
  border: 1px solid var(--hl-border);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  color: var(--hl-text);
  transition: all 0.18s ease;
  position: relative;
}

.card:hover {
  border-color: var(--hl-border-hot);
  box-shadow: 0 0 24px rgba(247, 129, 0, 0.25);
  text-decoration: none;
  transform: translateY(-2px);
}

.card.recommended::before {
  content: "RACCOMANDATO";
  position: absolute;
  top: -10px;
  right: 12px;
  background: var(--hl-orange);
  color: #000;
  font-size: 10px;
  font-weight: bold;
  padding: 3px 8px;
  letter-spacing: 1px;
}

.card-icon {
  font-size: 32px;
  margin-bottom: 6px;
  color: var(--hl-amber);
}

.card .arch {
  color: var(--hl-text-muted);
  font-size: 12px;
  letter-spacing: 1px;
}

.card .note {
  color: var(--hl-text);
  font-size: 12px;
  margin-top: 4px;
  min-height: 28px;
}

.card .note code {
  background: var(--hl-bg-panel);
  padding: 1px 5px;
  border: 1px solid var(--hl-border);
  color: var(--hl-yellow);
  font-size: 11px;
}

.btn {
  display: inline-block;
  margin-top: 12px;
  padding: 8px 14px;
  background: transparent;
  border: 1px solid var(--hl-orange);
  color: var(--hl-orange);
  font-size: 13px;
  letter-spacing: 1.5px;
  text-align: center;
  text-transform: uppercase;
  transition: all 0.15s ease;
}

.card:hover .btn {
  background: var(--hl-orange);
  color: #000;
}

.checksum-link {
  margin-top: 18px;
  font-size: 13px;
  color: var(--hl-text-muted);
}

/* ── Install blocks ───────────────────────────── */
.install-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.install-block {
  background: var(--hl-bg-panel);
  border: 1px solid var(--hl-border);
  padding: 18px 20px;
}

.install-block pre {
  background: var(--hl-bg);
  border: 1px solid var(--hl-border);
  padding: 12px 14px;
  overflow-x: auto;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.7;
}

.install-block .prompt {
  color: var(--hl-orange);
  font-weight: bold;
  margin-right: 8px;
}

.install-block .hint {
  color: var(--hl-text-muted);
  font-size: 12px;
  margin-top: 10px;
}

.install-block .hint code {
  background: var(--hl-bg);
  border: 1px solid var(--hl-border);
  color: var(--hl-yellow);
  padding: 1px 6px;
  font-size: 12px;
}

/* ── Features grid ────────────────────────────── */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.feat {
  background: var(--hl-bg-card);
  border-left: 3px solid var(--hl-orange);
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.feat strong {
  color: var(--hl-amber);
  font-size: 14px;
  letter-spacing: 1px;
}

.feat span {
  color: var(--hl-text-muted);
  font-size: 13px;
}

/* ── Quickstart block ─────────────────────────── */
.quickstart pre {
  background: var(--hl-bg-panel);
  border: 1px solid var(--hl-border);
  padding: 18px 20px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.8;
}

.quickstart .prompt { color: var(--hl-orange); font-weight: bold; margin-right: 6px; }
.quickstart .comment { color: var(--hl-dim); font-style: italic; }
code { color: var(--hl-yellow); }

/* ── Footer ───────────────────────────────────── */
footer {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
  padding: 48px 24px 64px;
  border-top: 1px solid var(--hl-border);
  text-align: center;
  color: var(--hl-dim);
}

footer p:first-child {
  font-style: italic;
  color: var(--hl-dim);
  margin-bottom: 12px;
}

footer .links {
  color: var(--hl-text-muted);
  margin: 12px 0;
}

footer .fineprint {
  color: var(--hl-text-muted);
  font-size: 11px;
  margin-top: 8px;
}

/* ── Mobile ───────────────────────────────────── */
@media (max-width: 640px) {
  .hero { padding: 40px 16px 32px; }
  .title-block h1 { font-size: 40px; letter-spacing: 4px; }
  .lambda svg { width: 64px; height: 64px; }
  section { padding: 32px 16px; }
  h2 { font-size: 18px; letter-spacing: 2px; }
}