:root { --bg: #eef1f4; --card: #fff; --txt: #1d2733; --muted: #5d6b7a; --acc: #1f6f8b; --err: #b3261e; --line: #d5dbe1; }
@media (prefers-color-scheme: dark) { :root { --bg: #13181d; --card: #1d242b; --txt: #e6ebf0; --muted: #9aa7b4; --acc: #5fb3cf; --err: #ff8a80; --line: #33404c; } }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; background: var(--bg); color: var(--txt); font: 16px/1.4 system-ui, -apple-system, "Segoe UI", sans-serif; padding: 16px; }
form { background: var(--card); padding: 28px 24px; border-radius: 12px; width: min(360px, 100%); display: grid; gap: 14px; box-shadow: 0 4px 24px rgba(0,0,0,.08); text-align: center; }
h1 { margin: 0 0 4px; font-size: 1.3rem; }
img { margin: 0 auto; }
label { display: grid; gap: 4px; text-align: left; font-size: .9rem; color: var(--muted); }
input { font: inherit; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; background: transparent; color: var(--txt); }
button { font: inherit; font-weight: 600; padding: 11px; border: 0; border-radius: 8px; background: var(--acc); color: #fff; cursor: pointer; }
#err { color: var(--err); margin: 0; min-height: 1.2em; font-size: .9rem; }