*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #f1f5f9;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.card {
  background: #fff;
  border-radius: 16px;
  padding: 40px;
  width: 100%;
  max-width: 380px;
  box-shadow: 0 4px 24px rgba(0,0,0,.08);
}
.logo { text-align: center; margin-bottom: 32px; }
.logo h1 { font-size: 22px; font-weight: 700; color: #111; }
.logo h1 span { color: #1677ff; }
.logo p { font-size: 13px; color: #6b7280; margin-top: 4px; }
.form-group { margin-bottom: 16px; }
label { display: block; font-size: 13px; font-weight: 500; color: #374151; margin-bottom: 6px; }
input {
  width: 100%; padding: 10px 14px;
  border: 1.5px solid #e5e7eb;
  border-radius: 8px; font-size: 15px; outline: none;
  transition: border-color .15s;
}
input:focus { border-color: #1677ff; }
.btn {
  width: 100%; padding: 11px;
  background: #1677ff; color: #fff;
  border: none; border-radius: 8px;
  font-size: 15px; font-weight: 600; cursor: pointer;
  margin-top: 8px; transition: background .15s;
}
.btn:hover { background: #0958d9; }
.btn:disabled { background: #93c5fd; cursor: default; }
.error {
  background: #fef2f2; border: 1px solid #fecaca;
  color: #dc2626; border-radius: 8px;
  padding: 10px 14px; font-size: 13px;
  margin-bottom: 16px; display: none;
}