:root {
  --bg: #ffffff; --fg: #111827; --muted: #5b6474; --card: #f5f7fb; --line: #e3e7ef;
  --brand: #2e5bff; --buy: #1b8e3e; --sell: #c62828;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0d1117; --fg: #e8ecf3; --muted: #9aa4b5; --card: #161c26; --line: #263041; --brand: #6d8cff; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--brand); }
.wrap { max-width: 960px; margin: 0 auto; padding: 0 16px; }
header { border-bottom: 1px solid var(--line); }
header .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.logo { font-weight: 700; font-size: 18px; color: var(--fg); text-decoration: none; display: flex; gap: 8px; align-items: center; }
.logo span { background: var(--brand); color: #fff; border-radius: 8px; width: 28px; height: 28px; display: grid; place-items: center; font-size: 15px; }
nav a { color: var(--muted); text-decoration: none; margin-left: 18px; font-size: 15px; }
.hero { padding: 64px 0 40px; }
.hero h1 { font-size: clamp(30px, 6vw, 46px); line-height: 1.15; margin: 0 0 16px; letter-spacing: -0.02em; }
.hero p { color: var(--muted); font-size: 18px; max-width: 620px; margin: 0 0 28px; }
.btn { display: inline-block; background: var(--brand); color: #fff; padding: 12px 22px; border-radius: 10px; text-decoration: none; font-weight: 600; }
.btn.ghost { background: transparent; color: var(--fg); border: 1px solid var(--line); margin-left: 8px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin: 24px 0 48px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 20px; }
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
h2 { font-size: 26px; margin: 48px 0 8px; }
.flow { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; color: var(--muted); font-size: 14px; margin: 16px 0 8px; }
.flow b { background: var(--card); border: 1px solid var(--line); color: var(--fg); padding: 6px 10px; border-radius: 8px; font-weight: 600; }
.price { display: flex; flex-direction: column; gap: 6px; }
.price .amt { font-size: 28px; font-weight: 700; }
.price ul { padding-left: 18px; margin: 8px 0 0; color: var(--muted); font-size: 15px; }
.notice { border-left: 4px solid var(--sell); background: var(--card); padding: 14px 16px; border-radius: 8px; color: var(--muted); font-size: 14px; margin: 32px 0; }
footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: 14px; }
footer a { color: var(--muted); margin-right: 16px; }
.doc { padding: 40px 0 60px; max-width: 760px; }
.doc h1 { font-size: 32px; margin-bottom: 4px; }
.doc .date { color: var(--muted); margin-top: 0; }
.doc h2 { font-size: 20px; margin: 32px 0 6px; }
.doc li { margin: 4px 0; }
@media (max-width: 520px) { nav a:not(:last-child) { display: none; } .btn.ghost { margin: 10px 0 0; } }