/* Kezulo launch site — single shared stylesheet.
   System font only (Apple-native feel), no external fonts/scripts/trackers.
   Light + dark via prefers-color-scheme. */

:root {
  --bg: #ffffff;
  --bg-elev: #f5f5f7;
  --card: #ffffff;
  --border: #e3e3e6;
  --text: #1d1d1f;
  --text-muted: #6e6e73;
  --accent: #0071e3;
  --accent-text: #ffffff;
  --radius: 16px;
  --maxw: 720px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --bg-elev: #111113;
    --card: #1c1c1e;
    --border: #2c2c2e;
    --text: #f5f5f7;
    --text-muted: #a1a1a6;
    --accent: #2997ff;
    --accent-text: #ffffff;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header / nav */
.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}
.wordmark {
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
}
.nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 15px;
  margin-left: 22px;
}
.nav a:hover { color: var(--text); }

/* Hero */
.hero {
  text-align: center;
  padding: 72px 0 48px;
}
.hero h1 {
  font-size: 44px;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 0 0 16px;
}
.hero p.lead {
  font-size: 20px;
  color: var(--text-muted);
  margin: 0 auto 28px;
  max-width: 560px;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 980px;
  font-size: 16px;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid transparent;
}
.btn-primary { background: var(--accent); color: var(--accent-text); }
.btn-primary:hover { opacity: 0.9; }
.btn-disabled {
  background: var(--bg-elev);
  color: var(--text-muted);
  border-color: var(--border);
  cursor: default;
}
.btn-note {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 10px;
}

/* Sections & content */
main { padding: 8px 0 64px; }
section { margin: 40px 0; }

h2 {
  font-size: 26px;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
}
h3 {
  font-size: 18px;
  margin: 28px 0 6px;
}
p { margin: 0 0 14px; }
a { color: var(--accent); }

.page-title {
  padding: 48px 0 8px;
}
.page-title h1 {
  font-size: 34px;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
}
.updated {
  color: var(--text-muted);
  font-size: 14px;
  margin: 0;
}

/* Feature grid */
.features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  list-style: none;
  padding: 0;
  margin: 0;
}
.features li {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
}
.features li strong { display: block; margin-bottom: 4px; }
.features li span { color: var(--text-muted); font-size: 15px; }

/* Card block (privacy/support items) */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
  margin: 16px 0;
}
.card h3 { margin-top: 0; }
.card p:last-child { margin-bottom: 0; }

ul.plain { padding-left: 20px; }
ul.plain li { margin-bottom: 8px; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  color: var(--text-muted);
  font-size: 14px;
}
.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  align-items: center;
  justify-content: space-between;
}
.site-footer a { color: var(--text-muted); text-decoration: none; }
.site-footer a:hover { color: var(--text); }
.site-footer nav a { margin-right: 18px; }

/* Responsive */
@media (max-width: 560px) {
  .hero { padding: 52px 0 36px; }
  .hero h1 { font-size: 34px; }
  .hero p.lead { font-size: 18px; }
  .features { grid-template-columns: 1fr; }
  .site-footer .container { flex-direction: column; align-items: flex-start; }
}