:root {
  --bg: #0b1218;
  --bg-elevated: #121c24;
  --ink: #e8eef3;
  --muted: #8fa3b3;
  --line: rgba(143, 163, 179, 0.22);
  --accent: #4fbdf4;
  --ok: #3dcf8e;
  --warn: #e0a64a;
  --radius: 14px;
  --font-display: "Barlow Condensed", "Arial Narrow", system-ui, sans-serif;
  --font-body: "Source Sans 3", "Segoe UI", system-ui, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.45;
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(79, 189, 244, 0.18), transparent 55%),
    radial-gradient(ellipse 60% 40% at 90% 10%, rgba(26, 122, 168, 0.16), transparent 50%),
    linear-gradient(180deg, #0e1820 0%, #0b1218 45%, #0a1015 100%);
}

.top {
  padding: 1.25rem clamp(1.25rem, 4vw, 3rem) 0;
}

.brand-logo {
  display: block;
  height: clamp(2rem, 4.5vw, 2.75rem);
  width: auto;
  background: transparent;
}

.hero {
  padding: 2rem clamp(1.25rem, 4vw, 3rem) 1.5rem;
  max-width: 44rem;
}

.eyebrow {
  margin: 0 0 0.6rem;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 3.4rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.05;
}

.lede {
  margin: 0 0 0.75rem;
  color: var(--muted);
  font-size: 1.1rem;
}

.version {
  margin: 0;
  color: var(--ok);
  font-size: 0.9rem;
}

.downloads {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  padding: 0.5rem clamp(1.25rem, 4vw, 3rem) 2rem;
}

.card {
  padding: 1.25rem 1.35rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(18, 28, 36, 0.72);
}

.card[hidden] {
  display: none !important;
}

.card.unavailable {
  opacity: 0.55;
}

.card h2 {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.card p {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.1rem;
  border-radius: 10px;
  background: var(--accent);
  color: #061018;
  font-weight: 700;
  text-decoration: none;
  transition: transform 0.15s ease, background 0.15s ease, opacity 0.15s ease;
}

.btn:hover {
  transform: translateY(-1px);
  background: #6ecaf7;
}

.btn.disabled,
.card.unavailable .btn,
.option.unavailable .btn {
  pointer-events: none;
  opacity: 0.5;
}

/* Mac ships two installers in one card, so it needs room for stacked rows. */
@media (min-width: 640px) {
  #card-mac {
    grid-column: span 2;
  }
}

.options {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.option {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  flex-wrap: wrap;
}

.option[hidden] {
  display: none !important;
}

.option .btn {
  flex: 0 0 auto;
  min-width: min(13rem, 100%);
}

.option-text {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
  flex: 1 1 14rem;
}

.option-label {
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 600;
}

.option-note {
  color: var(--muted);
  font-size: 0.83rem;
  line-height: 1.4;
}

.option-meta {
  color: var(--muted);
  font-size: 0.78rem;
  opacity: 0.85;
}

.option-note a {
  color: var(--accent);
  text-decoration-color: rgba(79, 189, 244, 0.5);
}

.btn-secondary {
  background: transparent;
  color: var(--ink);
  border: 1px solid rgba(79, 189, 244, 0.55);
}

.btn-secondary:hover {
  background: rgba(79, 189, 244, 0.12);
}

.meta {
  margin: 0.75rem 0 0 !important;
  font-size: 0.8rem !important;
  color: var(--muted);
}

.howto {
  padding: 0 clamp(1.25rem, 4vw, 3rem) 2rem;
  max-width: 40rem;
}

.howto h2 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
}

.howto ol {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--muted);
}

.howto li {
  margin-bottom: 0.45rem;
}

.howto h2 + .note {
  margin-top: 0;
}

.howto .note {
  margin: 0 0 0.75rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.howto code {
  padding: 0.1rem 0.35rem;
  border-radius: 5px;
  background: rgba(79, 189, 244, 0.1);
  color: var(--accent);
  word-break: break-all;
}

.howto strong {
  color: var(--ink);
}

/* Numbered walkthrough for the one-time macOS security prompt. */
.walkthrough {
  margin: 1.25rem 0 1.5rem;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.walkthrough > li {
  position: relative;
  margin: 0 0 1.5rem;
  padding-left: 2.75rem;
  counter-increment: step;
}

.walkthrough > li::before {
  content: counter(step);
  position: absolute;
  top: 0;
  left: 0;
  display: grid;
  place-items: center;
  width: 1.9rem;
  height: 1.9rem;
  border: 1px solid rgba(79, 189, 244, 0.5);
  border-radius: 50%;
  background: rgba(79, 189, 244, 0.14);
  color: var(--accent);
  font-size: 0.95rem;
  font-weight: 700;
}

.walkthrough h3 {
  margin: 0.15rem 0 0.4rem;
  color: var(--ink);
  font-size: 1.05rem;
  font-weight: 600;
}

.walkthrough p {
  margin: 0 0 0.45rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.walkthrough .careful {
  color: var(--warn);
  font-weight: 600;
}

.walkthrough .hint {
  font-size: 0.85rem;
  opacity: 0.85;
}

/* Mimics the System Settings row so users recognize what to look for. */
.settings-mock {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin: 0.55rem 0 0.7rem;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(232, 238, 243, 0.05);
}

.settings-mock-text {
  color: var(--ink);
  font-size: 0.88rem;
}

.settings-mock-btn {
  padding: 0.3rem 0.75rem;
  border: 1px solid rgba(143, 163, 179, 0.45);
  border-radius: 7px;
  background: rgba(143, 163, 179, 0.16);
  color: var(--ink);
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
}

.fallback {
  margin: 1.25rem 0 0;
  padding: 0.8rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--muted);
  font-size: 0.9rem;
}

.fallback summary {
  cursor: pointer;
  color: var(--ink);
  font-weight: 600;
}

.fallback p {
  margin: 0.65rem 0 0;
}

.foot {
  padding: 0 clamp(1.25rem, 4vw, 3rem) 3rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.direct-links {
  margin: 0.5rem 0 1rem;
  padding-left: 1.1rem;
}

.direct-links code {
  color: var(--accent);
  word-break: break-all;
}

.muted {
  opacity: 0.75;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
}