:root { --page: #f9f9f7; --surface: #fcfcfb; --ink: #0b0b0b; --muted: #898781; --border: rgba(11,11,11,.12); --accent: #2a78d6; --neg: #d03b3b; }
@media (prefers-color-scheme: dark) { :root { --page: #0e0e0d; --surface: #181817; --ink: #f2f2ee; --muted: #9a988f; --border: rgba(255,255,255,.12); --accent: #5b9be6; --neg: #ef6b6b; } }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; background: var(--page); color: var(--ink);
  font: 15px/1.4 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; padding: 16px; }
.box { width: 100%; max-width: 360px; background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 28px 24px; }
h1 { margin: 0 0 4px; font-size: 24px; } h1 span { color: var(--accent); }
.sub { margin: 0 0 20px; color: var(--muted); font-size: 14px; }
label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 14px; }
input { display: block; width: 100%; margin-top: 6px; padding: 10px 12px; font: inherit; color: var(--ink); background: var(--page);
  border: 1px solid var(--border); border-radius: 8px; }
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
button { width: 100%; padding: 11px; font: inherit; font-weight: 600; color: #fff; background: var(--accent); border: 0; border-radius: 8px; cursor: pointer; }
button:disabled { opacity: .6; cursor: wait; }
#msg { min-height: 1.4em; margin: 12px 0 0; color: var(--neg); font-size: 13px; }