:root {
  color-scheme: light dark;
  --bg: #fbfbfd;
  --bg-elevated: #ffffff;
  --fg: #1d1d1f;
  --fg-soft: #424245;
  --muted: #6e6e73;
  --border: rgba(0, 0, 0, 0.08);
  --accent: #0a84ff;
  --accent-soft: rgba(10, 132, 255, 0.12);
  --gradient: linear-gradient(135deg, #0a84ff 0%, #5e5ce6 50%, #bf5af2 100%);
  --gradient-soft: linear-gradient(180deg, rgba(10, 132, 255, 0.08) 0%, rgba(255, 255, 255, 0) 60%);
  --card: #ffffff;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04), 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06), 0 12px 32px rgba(0, 0, 0, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --bg-elevated: #1c1c1e;
    --fg: #f5f5f7;
    --fg-soft: #d1d1d6;
    --muted: #98989d;
    --border: rgba(255, 255, 255, 0.1);
    --accent: #0a84ff;
    --accent-soft: rgba(10, 132, 255, 0.18);
    --gradient: linear-gradient(135deg, #0a84ff 0%, #5e5ce6 50%, #bf5af2 100%);
    --gradient-soft: linear-gradient(180deg, rgba(10, 132, 255, 0.18) 0%, rgba(0, 0, 0, 0) 60%);
    --card: #1c1c1e;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5), 0 12px 32px rgba(0, 0, 0, 0.6);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
    "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.5;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* ---------- Layout ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  text-decoration: none;
  color: var(--fg);
  font-weight: 600;
  font-size: 1.02rem;
  letter-spacing: -0.01em;
}
.brand-mark {
  width: 26px;
  height: 26px;
  border-radius: 7px;
  background: var(--gradient);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
  box-shadow: 0 2px 6px rgba(10, 132, 255, 0.35);
}
.nav-links a {
  color: var(--fg-soft);
  text-decoration: none;
  font-size: 0.94rem;
  margin-left: 1.25rem;
  transition: color 120ms ease;
}
.nav-links a:hover { color: var(--accent); }

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 3rem 1.25rem 4rem;
}
.container-wide { max-width: 1040px; }

/* ---------- Hero ---------- */

.hero {
  position: relative;
  padding: 5rem 1.25rem 4rem;
  text-align: center;
  background: var(--gradient-soft);
  overflow: hidden;
}
.hero-inner { max-width: 760px; margin: 0 auto; position: relative; z-index: 1; }
.eyebrow {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  margin-bottom: 1.25rem;
}
.hero h1 {
  font-size: clamp(2.4rem, 6vw, 3.75rem);
  line-height: 1.05;
  letter-spacing: -0.035em;
  margin: 0 0 1.25rem;
  font-weight: 700;
}
.hero h1 .gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p.lede {
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  color: var(--fg-soft);
  margin: 0 auto 2rem;
  max-width: 580px;
}
.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.85rem 1.6rem;
  border-radius: 999px;
  background: var(--gradient);
  color: #fff;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  box-shadow: 0 6px 20px rgba(10, 132, 255, 0.35);
  transition: transform 150ms ease, box-shadow 150ms ease;
}
.hero-cta:hover { transform: translateY(-1px); box-shadow: 0 10px 28px rgba(10, 132, 255, 0.45); }
.hero-cta.secondary {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--border);
  box-shadow: none;
  margin-left: 0.5rem;
}
.hero-cta.secondary:hover { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }

/* ---------- Features ---------- */

.section { padding: 4rem 1.25rem; }
.section-inner { max-width: 1040px; margin: 0 auto; }
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.25rem);
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
  text-align: center;
  font-weight: 700;
}
.section-sub {
  color: var(--muted);
  text-align: center;
  margin: 0 auto 2.5rem;
  max-width: 560px;
}

.features {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
.feature {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform 180ms ease, box-shadow 180ms ease;
}
.feature:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.feature-icon {
  width: 40px;
  height: 40px;
  border-radius: 11px;
  background: var(--accent-soft);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}
.feature-icon svg { width: 22px; height: 22px; color: var(--accent); }
.feature h3 {
  margin: 0 0 0.4rem;
  font-size: 1.08rem;
  letter-spacing: -0.01em;
}
.feature p { margin: 0; color: var(--fg-soft); font-size: 0.96rem; }

/* ---------- Article (support / privacy) ---------- */

.page-header { padding: 4rem 1.25rem 1rem; background: var(--gradient-soft); text-align: center; }
.page-header h1 {
  font-size: clamp(2rem, 5vw, 2.75rem);
  letter-spacing: -0.025em;
  margin: 0 0 0.5rem;
}
.page-header p { color: var(--muted); margin: 0; }

.article h2 {
  font-size: 1.35rem;
  letter-spacing: -0.015em;
  margin: 2.25rem 0 0.6rem;
  font-weight: 600;
}
.article h3 {
  font-size: 1.05rem;
  margin: 1.5rem 0 0.4rem;
  font-weight: 600;
}
.article p, .article li { color: var(--fg-soft); }
.article ol, .article ul { padding-left: 1.4rem; }
.article ol li, .article ul li { margin-bottom: 0.35rem; }

.card-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.25rem 1.5rem;
  margin: 1.25rem 0;
  box-shadow: var(--shadow-sm);
}
.card-box p:first-child { margin-top: 0; }
.card-box p:last-child { margin-bottom: 0; }

code {
  background: var(--accent-soft);
  color: var(--accent);
  padding: 0.12rem 0.4rem;
  border-radius: 5px;
  font-family: "SF Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88em;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- Footer ---------- */

footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 1.25rem;
  margin-top: 4rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.88rem;
}
footer nav { margin-bottom: 0.6rem; }
footer nav a { color: var(--muted); margin: 0 0.6rem; }
footer nav a:hover { color: var(--accent); }

/* ---------- Tiny screens ---------- */
@media (max-width: 520px) {
  .nav-links a { margin-left: 0.85rem; }
  .hero-cta.secondary { margin-left: 0; margin-top: 0.6rem; display: inline-flex; }
}