:root { --bg: #fff; --fg: #1b2230; --muted: #5d6675; --line: #c9ced6; --accent: #26324a; --bad: #b3261e; color-scheme: light; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #11151c; --fg: #e3e6eb; --muted: #98a1ae; --line: #39424f; --accent: #c9d3e6; --bad: #f07a70; color-scheme: dark; }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--fg); }
body { font: 15px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; }
main { max-width: 340px; margin: 14vh auto 0; padding: 0 16px; }
h1 { font-size: 18px; font-weight: 600; margin: 0 0 20px; padding-bottom: 12px; border-bottom: 1px solid var(--line); }
label { display: block; font-size: 12px; color: var(--muted); margin: 14px 0 4px; }
input { width: 100%; font: inherit; color: var(--fg); background: var(--bg); border: 1px solid var(--line); padding: 8px 10px; border-radius: 2px; }
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
button { margin-top: 20px; font: inherit; font-weight: 600; background: var(--accent); color: var(--bg); border: 0; padding: 9px 18px; border-radius: 2px; cursor: pointer; }
button:disabled { opacity: .6; }
#msg { color: var(--bad); min-height: 1.4em; font-size: 14px; }