:root {
  --bg: #fff; --fg: #16181d; --muted: #5d6470; --line: #e3e6ea; --card: #f6f7f9; --accent: #0f8f86; --accent-fg: #fff;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0e1013; --fg: #eceef1; --muted: #9aa1ac; --line: #262a31; --card: #171a1f; --accent: #3fd0c2; --accent-fg: #062522; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif; }
a { color: var(--accent); }
code, pre { font: 14px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace; }
code { background: var(--card); padding: 1px 5px; border-radius: 4px; }

.top, main, footer { max-width: 900px; margin: 0 auto; padding: 0 24px; }
.top { display: flex; justify-content: space-between; align-items: center; height: 64px; }
.brand { display: flex; gap: 8px; align-items: center; color: var(--fg); font-weight: 600; text-decoration: none; }
.star { font-size: 15px; text-decoration: none; }

section { padding: 28px 0; border-top: 1px solid var(--line); }
section:first-child { border-top: 0; }
h1 { font-size: clamp(30px, 5vw, 44px); line-height: 1.12; letter-spacing: -0.02em; margin: 8px 0 16px; }
h2 { font-size: 20px; margin: 0 0 12px; }
.lead { font-size: 19px; color: var(--muted); margin: 0 0 12px; }
.meta { font-size: 15px; color: var(--muted); margin: 0; }

.hero { display: grid; grid-template-columns: 1fr 220px; gap: 40px; align-items: center; }
.shot { width: 220px; height: auto; border-radius: 28px; border: 1px solid var(--line); }
@media (max-width: 680px) { .hero { grid-template-columns: 1fr; } .shot { width: 180px; justify-self: center; } }

.step { display: grid; grid-template-columns: 88px 1fr; gap: 20px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.step:first-child { padding-top: 4px; }
.num { font-weight: 700; color: var(--accent); font-size: 15px; text-transform: uppercase; letter-spacing: 0.04em; padding-top: 3px; }
.step h2 { font-size: 22px; margin: 0 0 8px; }
.step p { margin: 0 0 14px; }
.actions { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-top: 10px; }
.actions .button { min-width: 210px; }
.actions small { color: var(--muted); font-size: 14px; }
.with-shot { display: grid; grid-template-columns: 1fr 160px; gap: 28px; align-items: start; }
.shot.small { width: 160px; border-radius: 22px; }
@media (max-width: 600px) { .step { grid-template-columns: 1fr; gap: 6px; } .with-shot { grid-template-columns: 1fr; } .shot.small { justify-self: center; } }

.button { display: inline-block; text-align: center; padding: 10px 16px; border-radius: 8px; background: var(--accent); color: var(--accent-fg); font-weight: 600; text-decoration: none; }
.unavailable { color: var(--muted); font-size: 15px; }

.features { margin: 0; padding-left: 22px; }
.features li { margin: 8px 0; }
.features { list-style: disc; }
.diagram { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; overflow-x: auto; margin: 18px 0 0; color: var(--muted); }

.oss p { margin: 0 0 14px; }
footer { padding: 24px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; text-align: center; }