body {
   font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
   margin: 0;
   background: #f6f7fb;
}

.box {
   max-width: 520px;
   margin: 48px auto;
   padding: 0 16px;
}

h1 {
   margin: 0 0 12px 0;
   font-size: 22px;
}

.card {
   background: #fff;
   border-radius: 10px;
   box-shadow: 0 2px 10px rgba(0,0,0,.06);
   padding: 14px;
}

.row {
   margin-bottom: 12px;
}

label {
   display: block;
   font-size: 12px;
   color: #666;
   margin-bottom: 6px;
}

input {
   width: 100%;
   padding: 9px 10px;
   border: 1px solid #d6d6d6;
   border-radius: 8px;
   box-sizing: border-box;
}

.btn {
   appearance: none;
   border: 0;
   border-radius: 8px;
   padding: 10px 12px;
   cursor: pointer;
   background: #1b5cff;
   color: #fff;
   font-weight: 600;
   width: 100%;
}

.msg {
   margin-top: 10px;
   font-size: 13px;
   min-height: 18px;
}

.msg.ok {
   color: #117a2f;
}

.msg.bad {
   color: #b21f1f;
   font-weight: 600;
}

.hint {
   margin-top: 10px;
   color: #666;
   font-size: 12px;
}