:root {
  --bg: #ffffff;
  --bg-alt: #f5f5f7;
  --fg: #1d1d1f;
  --fg-dim: #6e6e73;
  --line: rgba(0, 0, 0, 0.09);
  --accent: #2b3ee0;
  --accent-fg: #ffffff;
  --pivot: #ff3b30;
  --card: #ffffff;
  --shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
  --radius: 18px;
  --max: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
    "Helvetica Neue", Inter, system-ui, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --bg-alt: #0d0d0f;
    --fg: #f5f5f7;
    --fg-dim: #86868b;
    --line: rgba(255, 255, 255, 0.12);
    --accent: #6b83ff;
    --card: #131316;
    --shadow: 0 2px 24px rgba(0, 0, 0, 0.5);
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img, svg, video { max-width: 100%; height: auto; display: block; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--line);
}
.nav .wrap { display: flex; align-items: center; gap: 26px; height: 52px; }
.brand { display: flex; align-items: center; gap: 9px; font-weight: 600; font-size: 16px; }
.brand svg, .brand img { width: 26px; height: 26px; border-radius: 7px; }
.nav-links { display: flex; gap: 22px; margin-left: auto; font-size: 13px; color: var(--fg-dim); }
.nav-links a:hover { color: var(--fg); }
.nav .btn { padding: 6px 14px; font-size: 13px; }
@media (max-width: 780px) { .nav-links { display: none; } .nav .btn { margin-left: auto; } }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 26px; border-radius: 980px; font-size: 16px; font-weight: 500;
  background: var(--accent); color: var(--accent-fg);
  border: 1px solid transparent; cursor: pointer;
  transition: transform .15s ease, opacity .15s ease;
}
.btn:hover { opacity: .88; transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--fg); border-color: var(--line); }
.btn-ghost:hover { background: var(--bg-alt); }

/* ---------- hero ---------- */
.hero { padding: 88px 0 60px; text-align: center; }
.badge {
  display: inline-block; font-size: 12px; color: var(--fg-dim);
  border: 1px solid var(--line); border-radius: 980px;
  padding: 5px 13px; margin-bottom: 26px;
}
h1 {
  font-size: clamp(38px, 6.4vw, 68px); line-height: 1.06;
  letter-spacing: -0.025em; font-weight: 700; margin-bottom: 22px;
}
h1 em {
  font-style: normal;
  background: linear-gradient(100deg, var(--accent), var(--pivot));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lede {
  font-size: clamp(17px, 2.1vw, 21px); color: var(--fg-dim);
  max-width: 660px; margin: 0 auto 34px; line-height: 1.5;
}
.cta-row { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.cta-sub { margin-top: 15px; font-size: 13px; color: var(--fg-dim); }
.trust { margin-top: 8px; font-size: 12px; color: var(--fg-dim); letter-spacing: .01em; }

/* ---------- demo / video ---------- */
.demo { padding: 20px 0 70px; }
.demo-frame {
  border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--line); box-shadow: var(--shadow);
  background: var(--bg-alt);
}
.demo-frame video, .demo-frame img { width: 100%; display: block; }

/* ---------- privacy strip ---------- */
.strip {
  background: var(--bg-alt); border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line); padding: 22px 0;
}
.strip p {
  max-width: 800px; margin: 0 auto; text-align: center;
  font-size: 14px; color: var(--fg-dim);
}

/* ---------- sections ---------- */
section { padding: 84px 0; }
.section-head { text-align: center; margin-bottom: 50px; }
h2 {
  font-size: clamp(28px, 3.8vw, 42px); letter-spacing: -0.02em;
  font-weight: 700; margin-bottom: 12px;
}
.section-head p { color: var(--fg-dim); max-width: 620px; margin: 0 auto; font-size: 17px; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow);
}
.card h3 { font-size: 20px; margin-bottom: 9px; letter-spacing: -0.01em; }
.card p { color: var(--fg-dim); font-size: 15px; }
.card .ico { font-size: 26px; margin-bottom: 14px; }
@media (max-width: 860px) { .cards { grid-template-columns: 1fr; } }

.grid4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px 26px; }
.grid4 h3 { font-size: 16px; margin-bottom: 6px; }
.grid4 p { font-size: 14px; color: var(--fg-dim); }
@media (max-width: 960px) { .grid4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .grid4 { grid-template-columns: 1fr; } }

/* ---------- steps ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.step { text-align: center; }
.step .n {
  width: 42px; height: 42px; border-radius: 50%;
  background: var(--accent); color: #fff; font-weight: 600;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 14px;
}
.step h3 { font-size: 18px; margin-bottom: 6px; }
.step p { color: var(--fg-dim); font-size: 15px; }
kbd {
  font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 0.92em;
  background: var(--bg-alt); border: 1px solid var(--line);
  border-radius: 6px; padding: 2px 6px;
}
@media (max-width: 760px) { .steps { grid-template-columns: 1fr; } }

/* ---------- pricing ---------- */
.tiers { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; align-items: stretch; }
.tier {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 30px 26px;
  display: flex; flex-direction: column; position: relative;
}
.tier.popular { border-color: var(--accent); border-width: 2px; }
.tier .tag {
  position: absolute; top: -11px; left: 50%; transform: translateX(-50%);
  background: var(--accent); color: #fff; font-size: 11px; font-weight: 600;
  padding: 4px 12px; border-radius: 980px; white-space: nowrap;
}
.tier h3 { font-size: 19px; margin-bottom: 4px; }
.tier .devices { color: var(--fg-dim); font-size: 14px; margin-bottom: 16px; }
.tier .price { font-size: 40px; font-weight: 700; letter-spacing: -0.02em; }
.tier .once { font-size: 13px; color: var(--fg-dim); margin-bottom: 20px; }
.tier ul { list-style: none; margin-bottom: 24px; flex: 1; }
.tier li { font-size: 14px; padding: 6px 0 6px 22px; position: relative; color: var(--fg-dim); }
.tier li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 700; }
.tier .btn { width: 100%; }
.price-note { text-align: center; color: var(--fg-dim); font-size: 13px; margin-top: 24px; }
@media (max-width: 880px) { .tiers { grid-template-columns: 1fr; } }

/* ---------- faq ---------- */
.faq { max-width: 760px; margin: 0 auto; }
details {
  border-bottom: 1px solid var(--line); padding: 18px 0;
}
summary {
  cursor: pointer; font-weight: 500; font-size: 17px;
  list-style: none; display: flex; justify-content: space-between; gap: 16px;
}
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; color: var(--fg-dim); font-weight: 400; }
details[open] summary::after { content: "–"; }
details p { color: var(--fg-dim); margin-top: 11px; font-size: 15px; line-height: 1.6; }

/* ---------- final cta ---------- */
.final { background: var(--bg-alt); text-align: center; }

/* ---------- footer ---------- */
footer {
  border-top: 1px solid var(--line); padding: 46px 0 34px;
  font-size: 13px; color: var(--fg-dim);
}
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 26px; margin-bottom: 30px; }
.foot-grid h4 { font-size: 12px; color: var(--fg); margin-bottom: 10px; text-transform: uppercase; letter-spacing: .05em; }
.foot-grid a { display: block; padding: 3px 0; }
.foot-grid a:hover { color: var(--fg); }
.langs { display: flex; flex-wrap: wrap; gap: 10px; padding-top: 18px; border-top: 1px solid var(--line); }
.langs a { opacity: .75; }
.langs a:hover, .langs a[aria-current="true"] { opacity: 1; color: var(--fg); }
.copyright { padding-top: 16px; }
@media (max-width: 760px) { .foot-grid { grid-template-columns: 1fr 1fr; } }

/* ---------- article pages (guide / legal / compare) ---------- */
.article { max-width: 720px; margin: 0 auto; padding: 60px 24px 80px; }
.article h1 { font-size: clamp(30px, 4.4vw, 44px); margin-bottom: 10px; }
.article .meta { color: var(--fg-dim); font-size: 14px; margin-bottom: 34px; }
.article h2 { font-size: 24px; margin: 36px 0 12px; }
.article h3 { font-size: 18px; margin: 24px 0 8px; }
.article p, .article li { color: var(--fg-dim); font-size: 16px; line-height: 1.7; }
.article p { margin-bottom: 14px; }
.article ul, .article ol { margin: 0 0 16px 22px; }
.article li { margin-bottom: 7px; }
.article table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 15px; }
.article th, .article td { text-align: left; padding: 11px 12px; border-bottom: 1px solid var(--line); }
.article th { color: var(--fg); font-weight: 600; }
.article td { color: var(--fg-dim); }
.article a { color: var(--accent); }
.crumb { font-size: 13px; color: var(--fg-dim); margin-bottom: 18px; }
.crumb a:hover { color: var(--fg); }