:root { --brand: #0F6B60; --bg: #F5F7F8; --fg: #1B2630; --card: #fff; --line: #D9DFE5; }
@media (prefers-color-scheme: dark) { :root { --bg: #11181D; --fg: #E6ECEF; --card: #1A242B; --line: #2C3943; } }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; background: var(--bg); color: var(--fg); font: 16px/1.5 system-ui, sans-serif; }
.card { width: min(440px, calc(100vw - 32px)); background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 32px; }
h1 { font-size: 22px; margin: 0 0 16px; }
label { display: block; margin: 12px 0; font-size: 14px; }
input { display: block; width: 100%; box-sizing: border-box; margin-top: 4px; padding: 10px 12px; font: inherit; color: inherit; background: var(--bg); border: 1px solid var(--line); border-radius: 8px; }
button { padding: 10px 18px; font: inherit; color: #fff; background: var(--brand); border: 0; border-radius: 8px; cursor: pointer; }
.err { color: #B3261E; } .note { border: 1px solid var(--line); border-radius: 8px; padding: 12px; } .small { font-size: 13px; opacity: .8; }
.mono { font-family: ui-monospace, monospace; word-break: break-all; }
footer { position: fixed; bottom: 8px; font-size: 12px; opacity: .7; }