:root { color-scheme: light dark; font-family: system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif; color: #18242d; background: #f2f5f7; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100svh; display: grid; place-items: center; padding: 28px 20px; }
main { width: 100%; max-width: 430px; padding: 38px 32px; background: #fff; border: 1px solid #dce3e8; border-radius: 16px; box-shadow: 0 12px 40px #17303d0a; }
.eyebrow { margin: 0 0 14px; color: #536a77; font-size: 13px; letter-spacing: .08em; }
h1 { margin: 0; font-size: 28px; font-weight: 650; }
.intro { margin: 12px 0 28px; color: #536a77; line-height: 1.6; font-size: 14px; }
label { display: block; margin: 20px 0 8px; font-size: 14px; font-weight: 600; }
input { width: 100%; min-height: 46px; padding: 11px 12px; border: 1px solid #bdcad3; border-radius: 7px; font: inherit; background: #fff; color: inherit; }
input:focus-visible, button:focus-visible { outline: 3px solid #71a8c0; outline-offset: 3px; }
button { width: 100%; min-height: 46px; margin-top: 26px; border: 0; border-radius: 7px; background: #173f51; color: #fff; font: inherit; font-weight: 600; cursor: pointer; }
button:hover { background: #21556b; }
button:disabled { opacity: .65; cursor: wait; }
#error { margin: 18px 0 0; padding: 12px; border-radius: 6px; color: #9c2924; background: #fff0ee; font-size: 14px; line-height: 1.6; }
.footnote { margin: 24px 0 0; font-size: 12px; line-height: 1.6; color: #657782; text-align: center; }
.footnote a { color: inherit; text-underline-offset: 3px; }
@media (max-width: 380px) { main { padding: 28px 22px; } }
@media (prefers-color-scheme: dark) {
  :root { color: #e8eef2; background: #111b24; }
  main { background: #192630; border-color: #334550; }
  input { background: #111f29; border-color: #526570; }
  .eyebrow, .intro, .footnote { color: #adbfca; }
  button { background: #326b83; }
  #error { color: #ffbcb4; background: #422c2c; }
}