:root {
  color-scheme: light;
  --bg: #fafafa;
  --fg: #101010;
  --card: #ffffff;
  --line: #c6c6c6;
  --line-strong: #8a8a8a;
  --mut: #686868;
  --accent: #2744c7;
  --red: #b43c2a;
  --mono: "JetBrainsMono Nerd Font Mono", "JetBrainsMono Nerd Font", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body {
  margin: 0; min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 16px;
  background: var(--bg); color: var(--fg); font-family: var(--mono); font-size: 15px; font-weight: 500; line-height: 1.4;
}
.card { width: 100%; max-width: 360px; background: var(--card); border: 1px solid var(--line); border-radius: 5px; padding: 24px; }
h1 { font-size: 15px; margin: 0 0 16px; font-weight: 700; }
form { display: flex; flex-direction: column; gap: 12px; }
label { font-size: 13px; color: var(--mut); }
input {
  font: inherit; font-size: 16px; color: inherit; background: var(--card); border: 1px solid var(--line-strong); border-radius: 5px; padding: 8px 10px; width: 100%;
}
input:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
button {
  font: inherit; font-weight: 700; color: #fff; background: var(--accent); border: 1px solid var(--accent); border-radius: 5px;
  padding: 8px 12px; cursor: pointer;
}
button:disabled { cursor: not-allowed; opacity: .6; }
button.plain { background: transparent; color: var(--accent); border-color: var(--line); }
.message { margin: 0 0 12px; font-size: 13px; min-height: 2.8em; }   /* two lines reserved, so the card does not jump */
.sent-to { margin: 0; font-size: 13px; color: var(--mut); overflow-wrap: anywhere; }
.message.error { color: var(--red); }
@media (max-width: 600px) {
  input, button { min-height: 44px; }
}