:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --ink: #1c2430;
  --muted: #5b6572;
  --accent: #2456d8;
  --ok-bg: #e6f6ec; --ok-ink: #1a6b3c;
  --err-bg: #fdeaea; --err-ink: #a02c2c;
  --warn-bg: #fff6e0; --warn-ink: #8a6410;
  --radius: 12px;
}
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: var(--bg); color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  padding: 24px;
}
.card {
  background: var(--card); border-radius: var(--radius);
  box-shadow: 0 8px 24px rgba(20,30,50,.08);
  padding: 40px 36px; width: 100%; max-width: 420px;
}
h1 { margin: 0 0 8px; font-size: 1.6rem; }
.lede { margin: 0 0 24px; color: var(--muted); }
label { display: block; font-weight: 600; margin-bottom: 6px; font-size: .95rem; }
input {
  width: 100%; padding: 12px 14px; font-size: 1rem; border: 1px solid #cfd6de;
  border-radius: 8px; margin-bottom: 16px; background: #fff; color: var(--ink);
}
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
button {
  width: 100%; padding: 12px 16px; font-size: 1rem; font-weight: 600;
  background: var(--accent); color: #fff; border: 0; border-radius: 8px; cursor: pointer;
}
button[disabled] { opacity: .6; cursor: progress; }
.message { min-height: 1.4em; margin: 18px 0 0; font-size: .95rem; border-radius: 8px; padding: 10px 12px; display: none; }
.message.ok   { display: block; background: var(--ok-bg);   color: var(--ok-ink); }
.message.err  { display: block; background: var(--err-bg);  color: var(--err-ink); }
.message.warn { display: block; background: var(--warn-bg); color: var(--warn-ink); }