:root { --bg: #f4f1ea; --card: #fff; --ink: #1d1f24; --muted: #6b6f78; --line: #dcd7cc; --red: #c8102e; --yellow: #f2c300; --accent: #0b5cad; }
@media (prefers-color-scheme: dark) { :root { --bg: #15171b; --card: #1f2228; --ink: #eceef2; --muted: #9aa0aa; --line: #343841; --accent: #6aa8ff; } }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; background: var(--bg); color: var(--ink); font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; padding: 16px; }
.box { width: 100%; max-width: 380px; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 28px 24px; box-shadow: 0 6px 24px rgba(0,0,0,.06); }
.brand { display: flex; align-items: center; gap: 6px; }
.brand h1 { font-size: 22px; margin: 0 0 0 6px; letter-spacing: .2px; }
.brick { width: 22px; height: 14px; background: var(--red); border-radius: 3px; position: relative; }
.brick::before, .brick::after { content: ""; position: absolute; top: -4px; width: 6px; height: 4px; border-radius: 2px 2px 0 0; background: inherit; }
.brick::before { left: 3px; } .brick::after { right: 3px; }
.brick.b2 { background: var(--yellow); }
.lead { color: var(--muted); margin: 10px 0 22px; }
label { display: block; font-weight: 600; margin-bottom: 6px; }
input { width: 100%; font: inherit; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--ink); }
input#code { letter-spacing: 6px; font-size: 22px; text-align: center; }
button { margin-top: 12px; width: 100%; font: inherit; font-weight: 600; padding: 10px 12px; border: 0; border-radius: 8px; background: var(--accent); color: #fff; cursor: pointer; }
.m { color: var(--muted); font-size: 13px; margin: 12px 0 0; }
.err { color: var(--red); font-size: 14px; margin: 10px 0 0; }
a { color: var(--accent); }
.foot { color: var(--muted); font-size: 12px; text-align: center; margin: 22px 0 0; }