:root { --bg: #f4f5f7; --card: #fff; --ink: #1d2230; --muted: #667085; --line: #d9dde5; --accent: #2457c5; --err: #b42318; }
@media (prefers-color-scheme: dark) { :root { --bg: #12151c; --card: #1b2029; --ink: #e8eaf0; --muted: #9aa3b2; --line: #2e3542; --accent: #7aa2ff; --err: #ff8a80; } }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; background: var(--bg); color: var(--ink); font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; padding: 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 28px; width: 100%; max-width: 360px; }
h1 { margin: 0; font-size: 20px; }
.sub { margin: 4px 0 20px; color: var(--muted); }
label { display: block; margin-bottom: 14px; font-weight: 600; font-size: 13px; }
input { display: block; width: 100%; margin-top: 6px; padding: 10px 12px; font: inherit; color: inherit; background: transparent; border: 1px solid var(--line); border-radius: 8px; }
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
button { width: 100%; padding: 11px; font: inherit; font-weight: 600; color: #fff; background: var(--accent); border: 0; border-radius: 8px; cursor: pointer; }
.err { color: var(--err); margin: 0 0 14px; }