:root {
  --bg: #ffffff;
  --bg-alt: #f5f5f7;
  --text: #1d1d1f;
  --muted: #555559;
  --accent: #0062cc;
  --accent-text: #ffffff;
  --border: #d2d2d7;
  --radius: 14px;
  --max: 1080px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111113;
    --bg-alt: #1c1c1f;
    --text: #f5f5f7;
    --muted: #b0b0b6;
    --accent: #4da3ff;
    --accent-text: #0b0b0c;
    --border: #3a3a3e;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }
a:focus-visible, .button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  padding: 8px 12px;
  background: var(--bg);
  z-index: 10;
}
.skip-link:focus { left: 12px; top: 12px; }

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

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
}
.brand img { width: 28px; height: 28px; }
.site-nav { display: flex; gap: 20px; font-size: 15px; }
.site-nav a { color: var(--muted); text-decoration: none; }
.site-nav a:hover { color: var(--text); }

/* Hero */
.hero {
  text-align: center;
  padding: 80px 0 64px;
}
.hero img.app-icon {
  width: 128px;
  height: 128px;
}
.hero h1 {
  font-size: clamp(36px, 6vw, 56px);
  line-height: 1.1;
  margin: 24px 0 12px;
  letter-spacing: -0.02em;
}
.hero .tagline {
  font-size: clamp(18px, 2.4vw, 22px);
  color: var(--muted);
  max-width: 680px;
  margin: 0 auto 32px;
}
.cta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}
.button {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--accent);
}
.button.primary { background: var(--accent); color: var(--accent-text); }
.button.secondary { color: var(--accent); background: transparent; }
.requirements { margin-top: 16px; font-size: 14px; color: var(--muted); }

/* Sections */
section { padding: 64px 0; }
section.alt { background: var(--bg-alt); }
section h2 {
  font-size: clamp(28px, 4vw, 36px);
  text-align: center;
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}
section .lead {
  text-align: center;
  color: var(--muted);
  max-width: 640px;
  margin: 0 auto 40px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  list-style: none;
  padding: 0;
  margin: 0;
}
.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
section.alt .card { background: var(--bg); }
.card h3 { margin: 0 0 8px; font-size: 19px; }
.card p { margin: 0; color: var(--muted); font-size: 16px; }
.card .emoji { font-size: 28px; display: block; margin-bottom: 8px; }

/* Modes table */
.table-wrap { overflow-x: auto; }
table {
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  border-collapse: collapse;
  font-size: 16px;
}
th, td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}
th { font-weight: 600; }
td kbd, th kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 14px;
  padding: 2px 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-alt);
}
.note {
  max-width: 760px;
  margin: 16px auto 0;
  font-size: 14px;
  color: var(--muted);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  font-size: 14px;
  color: var(--muted);
}
.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
}
.site-footer nav { display: flex; flex-wrap: wrap; gap: 16px; }
.site-footer a { color: var(--muted); }

/* Long-form pages (privacy policy) */
.prose {
  max-width: 720px;
  margin: 0 auto;
  padding: 56px 24px 72px;
}
.prose h1 {
  font-size: clamp(32px, 5vw, 44px);
  line-height: 1.15;
  margin: 0 0 8px;
  letter-spacing: -0.02em;
}
.prose .updated { color: var(--muted); font-size: 15px; margin: 0 0 32px; }
.prose h2 { font-size: 22px; margin: 40px 0 8px; }
.prose p, .prose li { color: var(--text); }
.prose ul { padding-left: 1.2em; }
.prose li + li { margin-top: 6px; }
.prose .summary {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
}
.prose .summary p { margin: 0; }