:root { color-scheme: light dark; --fg: #1d1d1f; --bg: #ffffff; --muted: #5f6368; --line: #d9d9de; --accent: #1f5fd6; }
@media (prefers-color-scheme: dark) { :root { --fg: #ececf1; --bg: #16161a; --muted: #a0a0ab; --line: #34343c; --accent: #7aa7ff; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; }
main { max-width: 28rem; margin: 0 auto; padding: 3rem 1rem; }
h1 { font-size: 1.6rem; margin: 0 0 .5rem; }
.lead, .help, .small { color: var(--muted); }
.help, .small { font-size: .9rem; margin: .25rem 0 1rem; }
label { display: block; margin: 1rem 0 .25rem; }
fieldset { border: 1px solid var(--line); border-radius: .5rem; margin: 1rem 0; padding: .5rem 1rem; }
fieldset label { margin: .5rem 0; }
input:not([type=radio]):not([type=checkbox]) { display: block; width: 100%; padding: .6rem .7rem; margin-top: .25rem; border: 1px solid var(--line); border-radius: .4rem; background: transparent; color: inherit; font: inherit; }
.address { display: flex; align-items: center; gap: .4rem; }
.address input { flex: 1; }
button { margin-top: 1rem; padding: .65rem 1.1rem; border: 0; border-radius: .4rem; background: var(--accent); color: #fff; font: inherit; cursor: pointer; }
button:disabled { opacity: .6; cursor: default; }
#message { min-height: 1.5rem; }
a { color: var(--accent); }
.secondary { background: transparent; color: var(--accent); border: 1px solid var(--line); }