:root { --bg: #f6f7f9; --panel: #fff; --text: #1d2330; --muted: #6b7280; --border: #e3e6eb; --accent: #2f6fed; --err: #d64545; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #14161b; --panel: #1c1f26; --text: #e6e8ec; --muted: #9aa1ad; --border: #2c313b; --accent: #5b8cff; --err: #f07171; }
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 16px;
  font: 15px/1.55 system-ui, -apple-system, "Segoe UI", sans-serif; background: var(--bg); color: var(--text); }
.box { width: 100%; max-width: 380px; background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 28px; }
h1 { font-size: 20px; margin: 0 0 8px; }
.muted { color: var(--muted); margin: 0 0 16px; }
input[type=email] { width: 100%; font: inherit; padding: 10px 12px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text); margin-bottom: 12px; }
button { width: 100%; font: inherit; padding: 10px; border-radius: 8px; border: none; background: var(--accent); color: #fff; cursor: pointer; }
button:disabled { opacity: .6; }
.msg { margin-top: 14px; font-size: 14px; }
.err { color: var(--err); }
.hidden { display: none; }