:root {
  color-scheme: light;
  --bg: #ffffff;
  --bg-2: #f6f6f4;
  --border: #e3e2de;
  --text: #17171a;
  --text-2: #57565f;
  --accent: #2a78d6;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #121214;
    --bg-2: #1a1a1d;
    --border: #2e2e33;
    --text: #f2f2f3;
    --text-2: #b4b3bb;
    --accent: #3987e5;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code, pre { font-family: var(--mono); font-size: 14px; }
p code, li code { background: var(--bg-2); padding: 1px 5px; border-radius: 4px; }
pre {
  background: var(--bg-2); border: 1px solid var(--border); border-radius: 8px; padding: 14px 16px;
  overflow-x: auto; margin: 0 0 16px; line-height: 1.5;
}
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 24px; }

.top { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 64px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 8px; color: var(--text); font-weight: 700; font-size: 18px; }
.brand:hover { text-decoration: none; }
.brand svg { fill: var(--accent); }
.top nav { display: flex; gap: 20px; flex-wrap: wrap; }
.top nav a { color: var(--text-2); }

.hero { padding: 64px 24px 32px; }
.hero h1 { font-size: clamp(34px, 5vw, 52px); line-height: 1.1; letter-spacing: -0.02em; margin: 0 0 20px; max-width: 760px; }
.lead { font-size: 20px; color: var(--text-2); max-width: 720px; margin: 0 0 16px; }
.facts { color: var(--text-2); font-size: 15px; margin: 0 0 28px; }
.cta { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 10px 18px; border-radius: 8px; border: 1px solid var(--border);
  color: var(--text); font-weight: 500;
}
.btn:hover { text-decoration: none; background: var(--bg-2); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { filter: brightness(1.08); }

.shot img {
  display: block; width: 100%; height: auto; border: 1px solid var(--border); border-radius: 10px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, .08);
}

main > section.wrap { margin-top: 72px; }
main > section.hero, main > section.shot { margin-top: 0; }
h2 { font-size: 28px; letter-spacing: -0.01em; margin: 0 0 24px; }
h3 { font-size: 18px; margin: 0 0 8px; }

.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; counter-reset: s; }
.steps li { counter-increment: s; }
.steps li::before {
  content: counter(s); display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 50%;
  background: var(--bg-2); border: 1px solid var(--border); font-size: 14px; font-weight: 600; margin-bottom: 10px;
}
.steps p { color: var(--text-2); margin: 0; font-size: 16px; }

.cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: 24px; }
.cols ul { margin: 0; padding-left: 20px; color: var(--text-2); font-size: 16px; }
.cols li { margin-bottom: 4px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: start; }
.grid2 > * { min-width: 0; }
.grid2 p { color: var(--text-2); }
.label { font-size: 14px; color: var(--text-2); margin-bottom: 6px; }

.checks { list-style: none; padding: 0; margin: 0; max-width: 760px; }
.checks li { padding-left: 28px; position: relative; margin-bottom: 12px; color: var(--text-2); }
.checks li::before { content: "✓"; position: absolute; left: 4px; color: var(--accent); font-weight: 700; }
#start p, #not p { color: var(--text-2); max-width: 760px; }

footer {
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding: 48px 24px 40px;
  margin-top: 48px; border-top: 1px solid var(--border); color: var(--text-2); font-size: 15px;
}

@media (max-width: 860px) {
  .steps { grid-template-columns: 1fr 1fr; }
  .cols, .grid2 { grid-template-columns: 1fr; }
}
@media (max-width: 520px) {
  body { font-size: 16px; }
  .wrap { padding: 0 16px; }
  .hero { padding-left: 16px; padding-right: 16px; }
  main > section.wrap { margin-top: 56px; }
  main > section.hero, main > section.shot { margin-top: 0; }
  .steps { grid-template-columns: 1fr; }
  .lead { font-size: 18px; }
}

#start h3 { margin-top: 28px; }
.note { color: var(--text-2); font-size: 15px; margin-top: -6px; }