:root { --ground: #f3f5f9; --card: #ffffff; --text: #0d1b33; --muted: #5a6780; --border: #d6dce8; --bad: #c0392f; color-scheme: light; }
@media (prefers-color-scheme: dark) {
  :root { --ground: #0e1420; --card: #171f2e; --text: #e8ecf4; --muted: #9aa6bd; --border: #2a3650; --bad: #e06060; color-scheme: dark; }
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 16px; background: var(--ground); color: var(--text); font-family: 'DM Sans', 'Helvetica Neue', Helvetica, Arial, system-ui, sans-serif; }
.box { width: 100%; max-width: 360px; background: var(--card); border-top: 3px solid var(--text); padding: 28px 24px 24px; }
.brand { margin: 0; font-size: 12px; letter-spacing: 0.14em; color: var(--muted); font-weight: 600; }
h1 { margin: 4px 0 2px; font-family: 'Montserrat', 'DM Sans', sans-serif; font-size: 26px; font-weight: 700; letter-spacing: -0.01em; }
.sub { margin: 0 0 20px; font-size: 14px; color: var(--muted); }
label { display: block; font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); margin-bottom: 6px; }
input { width: 100%; font: inherit; font-size: 16px; padding: 10px 12px; border: 1px solid var(--border); background: var(--card); color: var(--text); border-radius: 0; }
input:focus-visible, button:focus-visible { outline: 2px solid var(--text); outline-offset: 2px; }
button { margin-top: 14px; width: 100%; font: inherit; font-size: 15px; font-weight: 600; padding: 10px 12px; border: 0; background: var(--text); color: var(--card); cursor: pointer; border-radius: 0; }
button:disabled, input:disabled { opacity: 0.5; cursor: not-allowed; }
.msg { margin: 0 0 16px; padding: 8px 10px; border-left: 3px solid var(--bad); color: var(--bad); font-size: 14px; background: transparent; }
.msg.ok { border-left-color: #1d7a4c; color: inherit; }
.back { display: inline-block; margin-top: 16px; font-size: 14px; color: var(--muted); }
.field + .field { margin-top: 12px; }