:root {
  --bg: #000;
  --card: #1c1c1e;
  --card-2: #2c2c2e;
  --separator: #38383a;
  --text: #fff;
  --secondary: #8e8e93;
  --blue: #0a84ff;
  --z1: #8e8e93;
  --z2: #0a84ff;
  --z3: #30d158;
  --z4: #ff9f0a;
  --z5: #ff453a;
  --radius: 22px;
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.5 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, .rounded { font-family: ui-rounded, "SF Pro Rounded", -apple-system, sans-serif; }

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

.wrap { max-width: 980px; margin: 0 auto; padding: 0 22px; }

/* Nav */
nav { position: sticky; top: 0; z-index: 10; backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
      background: rgba(0, 0, 0, 0.72); border-bottom: 1px solid rgba(255, 255, 255, 0.06); }
nav .wrap { display: flex; align-items: center; gap: 12px; height: 56px; }
nav img { width: 30px; height: 30px; border-radius: 7px; }
nav .name { font-weight: 700; color: var(--text); margin-right: auto; }
nav a.link { color: var(--secondary); font-size: 15px; }
nav a.link:hover { color: var(--text); text-decoration: none; }

/* Hero */
.hero { text-align: center; padding: 72px 0 40px; position: relative; overflow: hidden; }
.hero::before { content: ""; position: absolute; inset: -40% 10% auto; height: 520px; z-index: -1;
                background: radial-gradient(closest-side, rgba(48, 209, 88, 0.28), transparent); }
.hero .icon { width: 132px; height: 132px; border-radius: 30px; box-shadow: 0 20px 60px rgba(48, 209, 88, 0.25); }
.hero h1 { font-size: clamp(40px, 7vw, 64px); line-height: 1.05; margin: 26px 0 10px; letter-spacing: -0.5px; }
.hero .tagline { font-size: clamp(19px, 2.6vw, 23px); color: var(--secondary); max-width: 620px; margin: 0 auto; }
.zone-line { font-size: clamp(24px, 4vw, 34px); font-weight: 800; color: var(--z3); margin: 28px 0 4px; }
.upnext { font-size: 13px; letter-spacing: 1px; color: var(--secondary); font-weight: 600; }

/* Step progress bar like the live screen */
.steps { display: flex; gap: 6px; max-width: 460px; margin: 14px auto 0; }
.steps span { height: 6px; border-radius: 3px; flex: 1; background: var(--card-2); }
.steps .z1 { background: var(--z1); } .steps .z2 { background: var(--z2); }
.steps .z3 { background: var(--z3); } .steps .z4 { background: var(--z4); } .steps .z5 { background: var(--z5); }
.steps .active { flex: 5; background: linear-gradient(90deg, var(--z3) 55%, rgba(48, 209, 88, 0.3) 55%); }

.buttons { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 36px; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 14px 26px; border-radius: 999px;
       font-weight: 600; font-size: 17px; background: var(--blue); color: #fff; }
.btn.secondary { background: var(--card-2); color: var(--text); }
.btn:hover { text-decoration: none; filter: brightness(1.1); }

/* Sections */
section { padding: 44px 0; }
.section-title { font-size: clamp(28px, 4vw, 36px); margin: 0 0 6px; }
.section-sub { color: var(--secondary); margin: 0 0 24px; }

/* Screenshot gallery */
.gallery { display: flex; gap: 20px; overflow-x: auto; scroll-snap-type: x mandatory; scrollbar-width: none;
           padding: 8px max(22px, calc((100vw - 936px) / 2)) 22px;
           scroll-padding: 0 max(22px, calc((100vw - 936px) / 2)); }
.gallery::-webkit-scrollbar { display: none; }
.gallery img { height: min(620px, 78vh); border-radius: 28px; scroll-snap-align: center; flex: none;
               box-shadow: 0 10px 40px rgba(0, 0, 0, 0.6); }

/* Feature cards */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); gap: 16px; }
.card { background: var(--card); border-radius: var(--radius); padding: 24px; }
.card h3 { margin: 12px 0 6px; font-size: 20px; }
.card p { margin: 0; color: var(--secondary); font-size: 16px; }
.dot { width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; font-size: 18px; }
.bg-z1 { background: rgba(142, 142, 147, 0.2); } .bg-z2 { background: rgba(10, 132, 255, 0.2); }
.bg-z3 { background: rgba(48, 209, 88, 0.2); } .bg-z4 { background: rgba(255, 159, 10, 0.2); }
.bg-z5 { background: rgba(255, 69, 58, 0.2); }

/* Zone chart like the calibration card */
.zones { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; align-items: end; height: 120px; margin-bottom: 16px; }
.zones span { border-radius: 8px; }
.zone-rows { margin: 0; padding: 0; list-style: none; }
.zone-rows li { display: flex; align-items: center; gap: 10px; padding: 10px 0; border-top: 1px solid var(--separator); }
.zone-rows li:first-child { border-top: 0; }
.zone-rows i { width: 12px; height: 12px; border-radius: 50%; }
.zone-rows b { font-weight: 500; }
.zone-rows em { margin-left: auto; font-style: normal; color: var(--secondary); }

/* Inset grouped list (FAQ) */
.list { background: var(--card); border-radius: var(--radius); overflow: hidden; }
.list details { border-top: 1px solid var(--separator); margin-left: 20px; }
.list details:first-child { border-top: 0; }
.list summary { cursor: pointer; list-style: none; padding: 16px 20px 16px 0; font-weight: 500;
                display: flex; justify-content: space-between; gap: 16px; }
.list summary::-webkit-details-marker { display: none; }
.list summary::after { content: "›"; color: var(--secondary); font-size: 22px; line-height: 1; transition: transform .2s; }
.list details[open] summary::after { transform: rotate(90deg); }
.list details p { margin: 0 20px 16px 0; color: var(--secondary); }
.footnote { color: var(--secondary); font-size: 14px; margin: 8px 20px 0; }

/* Banner, like the in-app status banners */
.banner { display: flex; gap: 14px; align-items: center; background: var(--z3); color: #fff; border-radius: 16px;
          padding: 16px 20px; font-weight: 600; }
.banner a { color: #fff; text-decoration: underline; }

/* Prose pages */
.prose { max-width: 720px; }
.prose h2 { font-size: 22px; margin: 34px 0 8px; }
.prose p, .prose li { color: #d1d1d6; }
.prose .card { margin: 16px 0; }

footer { color: var(--secondary); font-size: 14px; text-align: center; padding: 48px 0 64px; }
footer a { color: var(--secondary); margin: 0 10px; }