:root{color-scheme:light dark;--bg: #ffffff;--fg: #14171a;--muted: #657786;--border: #e1e8ed;--accent: #6364ff}@media(prefers-color-scheme:dark){:root{--bg: #15181c;--fg: #e7e9ea;--muted: #8899a6;--border: #2f3336}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}a{color:var(--accent);text-decoration:none}button{font-family:inherit;cursor:pointer}.muted{color:var(--muted)}.container{max-width:600px;margin:0 auto;min-height:100vh;border-inline:1px solid var(--border)}.btn{display:inline-block;padding:10px 20px;border-radius:999px;border:1px solid var(--accent);background:var(--accent);color:#fff;font-weight:600}.btn-outline{background:transparent;color:var(--accent)}