:root {
  --bg: #ffffff;
  --fg: #1a1a1b;
  --muted: #5f6368;
  --line: #e6e8ea;
  --card: #f6f7f8;
  --accent: #ff4500;
  --accent-ink: #ffffff;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121213;
    --fg: #e8eaed;
    --muted: #9aa0a6;
    --line: #2c2d2e;
    --card: #1c1d1e;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--accent); }
.wrap { max-width: 920px; margin: 0 auto; padding: 0 20px; }

header.top { border-bottom: 1px solid var(--line); }
header.top .wrap { display: flex; align-items: center; gap: 10px; height: 64px; }
header.top img { width: 32px; height: 32px; }
header.top .brand { font-weight: 700; font-size: 18px; color: var(--fg); text-decoration: none; flex: 1; }
header.top nav a { color: var(--muted); text-decoration: none; margin-left: 18px; font-size: 15px; }

.hero { padding: 72px 0 48px; text-align: center; }
.hero img { width: 96px; height: 96px; }
.hero h1 { font-size: clamp(32px, 6vw, 52px); line-height: 1.1; margin: 20px 0 12px; letter-spacing: -0.02em; }
.hero p.lead { font-size: 20px; color: var(--muted); max-width: 640px; margin: 0 auto 28px; }
.quote { font-style: italic; color: var(--muted); }

.btn {
  display: inline-block; padding: 12px 22px; border-radius: 10px; font-weight: 650;
  text-decoration: none; background: var(--accent); color: var(--accent-ink); border: 0; font-size: 16px; cursor: pointer;
}
.btn.secondary { background: var(--card); color: var(--fg); border: 1px solid var(--line); }
.btn[aria-disabled="true"] { opacity: 0.6; cursor: default; }

section { padding: 40px 0; border-top: 1px solid var(--line); }
h2 { font-size: 28px; margin: 0 0 20px; letter-spacing: -0.01em; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 20px; }
.card h3 { margin: 0 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
kbd {
  font: 600 13px ui-monospace, monospace; padding: 2px 6px; border-radius: 5px;
  background: var(--bg); border: 1px solid var(--line);
}

.plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.plan { border: 1px solid var(--line); border-radius: 16px; padding: 24px; }
.plan.pro { border: 2px solid var(--accent); }
.plan .price { font-size: 36px; font-weight: 750; margin: 6px 0 2px; }
.plan .note { color: var(--muted); font-size: 14px; margin-bottom: 14px; }
.plan ul { padding-left: 20px; margin: 0 0 20px; }

footer { border-top: 1px solid var(--line); padding: 28px 0 48px; color: var(--muted); font-size: 14px; }
footer a { color: var(--muted); margin-right: 16px; }

.legal { padding: 40px 0 24px; }
.legal h1 { font-size: 34px; margin: 0 0 4px; }
.legal .updated { color: var(--muted); margin: 0 0 28px; }
.legal h2 { font-size: 21px; margin: 28px 0 8px; }

header.top .brand { white-space: nowrap; }
@media (max-width: 520px) {
  header.top nav a:not(:last-child) { display: none; }
}

.hero .note { color: var(--muted); font-size: 14px; margin-top: 14px; }
.steps { text-align: left; max-width: 520px; margin: 24px auto 0; }
.steps ol { padding-left: 20px; margin: 8px 0 12px; }
.steps p { color: var(--muted); }
.key-row { display: flex; gap: 8px; align-items: center; margin: 8px 0 18px; }
.key-row code {
  flex: 1; min-width: 0; overflow-wrap: anywhere; padding: 10px 12px; border-radius: 8px;
  background: var(--bg); border: 1px solid var(--line); font: 600 14px ui-monospace, monospace;
}
.steps h3 { margin-top: 4px; }