* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: flex; align-items: center; justify-content: center;
       background: #f4f5f7; font-family: Arial, Helvetica, sans-serif; color: #0f172a; padding: 16px; }
.card { width: 100%; max-width: 400px; background: #fff; border-radius: 8px; overflow: hidden;
        box-shadow: 0 1px 3px rgba(15, 23, 42, .12); }
.card header { background: #0f172a; color: #fff; padding: 20px 28px; font-size: 20px; font-weight: bold; }
.card main { padding: 28px; }
h1 { font-size: 18px; margin: 0 0 16px; }
p { font-size: 14px; line-height: 1.5; color: #334155; margin: 0 0 16px; }
label { display: block; font-size: 13px; font-weight: bold; margin: 0 0 6px; }
input { width: 100%; padding: 10px 12px; font-size: 15px; border: 1px solid #cbd5e1; border-radius: 6px; margin: 0 0 16px; }
button, .button { display: block; width: 100%; padding: 12px; font-size: 15px; font-weight: bold; color: #fff;
                  background: #2563eb; border: 0; border-radius: 6px; cursor: pointer; text-align: center; text-decoration: none; }
.alert { padding: 10px 12px; border-radius: 6px; font-size: 14px; margin: 0 0 16px; }
.alert.error { background: #fef2f2; color: #991b1b; }
.alert.info { background: #eff6ff; color: #1e40af; }
.links { margin-top: 16px; text-align: center; font-size: 14px; }
.links a { color: #2563eb; }
.hint { font-size: 12px; color: #64748b; margin: -10px 0 16px; }