:root {
  --bg: #ffffff;
  --bg-alt: #f8f9fa;
  --border: #dee2e6;
  --text: #1d1f21;
  --text-muted: #5a6169;
  --accent: #007bc2;
  --accent-dark: #005a8f;
  --green: #28a745;
  --amber: #f0ad4e;
  --red: #dc3545;
  --radius: 8px;
  --max-width: 1080px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14161a;
    --bg-alt: #1c1f24;
    --border: #2c3038;
    --text: #eef0f2;
    --text-muted: #a2a9b1;
    --accent: #4db3ff;
    --accent-dark: #7fc8ff;
  }
}

:root[data-theme="dark"] {
  --bg: #14161a;
  --bg-alt: #1c1f24;
  --border: #2c3038;
  --text: #eef0f2;
  --text-muted: #a2a9b1;
  --accent: #4db3ff;
  --accent-dark: #7fc8ff;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
}

a { color: var(--accent); }
a:hover { color: var(--accent-dark); }

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* -- header ------------------------------------------------------------ */

header.site {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

header.site .wrap {
  display: flex;
  align-items: center;
  gap: 24px;
  padding-top: 14px;
  padding-bottom: 14px;
}

.logo {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}

nav.site-nav {
  display: flex;
  gap: 20px;
  margin-left: auto;
  flex-wrap: wrap;
}

nav.site-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
}

nav.site-nav a:hover { color: var(--accent); }

/* -- hero ---------------------------------------------------------------- */

.hero {
  padding: 64px 0 48px;
  text-align: center;
}

.hero h1 {
  font-size: clamp(1.9rem, 4vw, 2.75rem);
  margin: 0 0 14px;
  letter-spacing: -0.01em;
}

.hero p.lede {
  max-width: 640px;
  margin: 0 auto 30px;
  color: var(--text-muted);
  font-size: 1.1rem;
}

.cta-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.98rem;
  border: 1px solid transparent;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-dark); color: #fff; }

.btn-secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }

.hero-shot {
  margin: 48px auto 0;
  max-width: 920px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
}

.hero-shot img { display: block; width: 100%; height: auto; }

/* -- sections ------------------------------------------------------------ */

section { padding: 56px 0; }
section.alt { background: var(--bg-alt); }
section h2 {
  font-size: 1.6rem;
  margin: 0 0 8px;
}
section > .wrap > p.section-lede {
  color: var(--text-muted);
  margin: 0 0 32px;
  max-width: 680px;
}

/* -- download cards ------------------------------------------------------ */

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

.dl-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color 0.15s ease;
}

.dl-card[data-recommended="true"] {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

.dl-card .os-name {
  font-weight: 700;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.badge {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: var(--accent);
  color: #fff;
  padding: 2px 8px;
  border-radius: 999px;
}

.dl-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
  flex-grow: 1;
}

.dl-card .btn { justify-content: center; width: 100%; }
.dl-card .btn-link {
  font-size: 0.85rem;
  text-align: center;
  color: var(--text-muted);
}

/* -- one-command (uv) install ------------------------------------------- */

.uv-install {
  margin-top: 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  background: var(--bg);
}

.uv-install h3 {
  margin: 0 0 8px;
  font-size: 1.15rem;
}

.uv-install > p {
  margin: 0 0 18px;
  color: var(--text-muted);
  font-size: 0.95rem;
  max-width: 760px;
}

.cmd-block {
  margin-bottom: 14px;
  border-radius: var(--radius);
}

.cmd-block[data-recommended="true"] .cmd {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

.cmd-label {
  font-size: 0.88rem;
  font-weight: 600;
  margin: 0 0 6px;
}

.cmd {
  display: flex;
  align-items: stretch;
  gap: 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-alt);
  overflow: hidden;
}

.cmd pre {
  margin: 0;
  padding: 12px 14px;
  flex: 1;
  min-width: 0;
  overflow-x: auto;
  font-size: 0.86rem;
  line-height: 1.5;
}

.copy-btn {
  flex: none;
  border: 0;
  border-left: 1px solid var(--border);
  background: transparent;
  color: var(--accent);
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0 16px;
  cursor: pointer;
}

.copy-btn:hover { background: var(--bg); }

.uv-manual {
  margin-top: 18px;
  font-size: 0.92rem;
}

.uv-manual summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--accent);
}

.uv-manual-body { margin-top: 12px; }

.uv-manual-body > p {
  color: var(--text-muted);
  margin: 14px 0 6px;
}

.uv-manual-body > p.cmd-label { color: var(--text); }

.uv-manual-body code,
.uv-install > p code {
  font-size: 0.88em;
}

.uv-manual-body > p code {
  background: var(--bg-alt);
  padding: 1px 6px;
  border-radius: 4px;
}

.dl-note {
  margin-top: 24px;
  font-size: 0.92rem;
  color: var(--text-muted);
}

/* -- steps ---------------------------------------------------------------- */

.steps {
  list-style: none;
  counter-reset: step;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 18px;
}

.steps li {
  counter-increment: step;
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.steps li::before {
  content: counter(step);
  flex: none;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
}

.steps li strong { display: block; margin-bottom: 2px; }
.steps li span.detail { color: var(--text-muted); font-size: 0.95rem; }

.video-placeholder {
  margin-top: 40px;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  aspect-ratio: 16 / 9;
  max-width: 720px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: var(--text-muted);
  background: var(--bg-alt);
}

.video-placeholder svg { width: 48px; height: 48px; opacity: 0.6; }

/* -- features -------------------------------------------------------------- */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.feature-grid .feature h3 {
  font-size: 1.05rem;
  margin: 0 0 6px;
}
.feature-grid .feature p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.94rem;
}

.shot-secondary {
  margin-top: 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.shot-secondary img { display: block; width: 100%; height: auto; }
.shot-caption {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: 10px;
}

/* -- faq -------------------------------------------------------------------- */

.faq {
  max-width: 760px;
  margin: 0 auto;
}

.faq details {
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.faq summary::-webkit-details-marker { display: none; }

.faq summary::after {
  content: "+";
  font-size: 1.3rem;
  color: var(--text-muted);
  flex: none;
}

.faq details[open] summary::after { content: "\2212"; }

.faq .answer {
  margin-top: 10px;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.faq .answer code {
  background: var(--bg-alt);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.88em;
}

/* -- footer ------------------------------------------------------------------ */

footer.site {
  border-top: 1px solid var(--border);
  padding: 36px 0;
  color: var(--text-muted);
  font-size: 0.88rem;
}

footer.site .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  justify-content: space-between;
  align-items: center;
}

footer.site a { color: var(--text-muted); }
footer.site a:hover { color: var(--accent); }

.footer-links { display: flex; gap: 18px; flex-wrap: wrap; }

@media (max-width: 640px) {
  header.site .wrap { flex-wrap: wrap; }
  nav.site-nav { gap: 14px; }
  .hero { padding: 40px 0 32px; }
}