:root {
  color-scheme: light dark;
  --bg: #f5f6f8;
  --card-bg: #ffffff;
  --text: #1b1f24;
  --muted: #5c6570;
  --border: #d7dbe0;
  --accent: #2f6fed;
  --accent-contrast: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171a;
    --card-bg: #1e2226;
    --text: #e7eaee;
    --muted: #9aa4af;
    --border: #33393f;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.55;
}

.page {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 16px 64px;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  color: var(--text);
  text-decoration: none;
}

nav {
  display: flex;
  gap: 16px;
  font-size: 14px;
}

nav a {
  color: var(--muted);
  text-decoration: none;
}

nav a:hover {
  color: var(--accent);
  text-decoration: underline;
}

main {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.hero {
  padding: 32px 0 8px;
}

.hero h1 {
  margin: 0 0 12px;
  font-size: 26px;
  line-height: 1.25;
}

.tagline {
  margin: 0 0 20px;
  font-size: 16px;
  color: var(--muted);
  max-width: 60ch;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.button {
  display: inline-block;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 9px 14px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
}

.button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.button.primary {
  background: var(--accent);
  color: var(--accent-contrast);
  border-color: var(--accent);
}

.button.primary:hover {
  color: var(--accent-contrast);
  opacity: 0.9;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
}

.card h2 {
  margin: 0 0 12px;
  font-size: 17px;
}

.card p {
  margin: 0 0 12px;
}

.card p:last-child {
  margin-bottom: 0;
}

.card ul {
  margin: 0 0 12px;
  padding-left: 20px;
}

.card ul li {
  margin-bottom: 8px;
}

.card a {
  color: var(--accent);
  text-decoration: none;
}

.card a:hover {
  text-decoration: underline;
}

.screenshot-card .screenshot {
  display: block;
  width: 100%;
  height: auto;
  margin-top: 16px;
  border-radius: 6px;
  border: 1px solid var(--border);
}

footer {
  margin-top: 32px;
  text-align: center;
  font-size: 12px;
  color: var(--muted);
}

@media (max-width: 520px) {
  .hero h1 { font-size: 22px; }
  header { flex-wrap: wrap; gap: 12px; }
}