:root {
  --blue: #0052CC;
  --blue-dark: #003D99;
  --orange: #FF6B35;
  --gray-900: #111827;
  --gray-700: #374151;
  --gray-500: #6B7280;
  --gray-300: #D1D5DB;
  --gray-100: #F3F4F6;
  --bg-warm: #F9FAFB;
  --white: #FFFFFF;
  --radius-sm: 8px;
  --radius-md: 12px;
  --shadow-md: 0 4px 12px rgba(17, 24, 39, 0.08), 0 2px 4px rgba(17, 24, 39, 0.06);
  --shadow-lg: 0 12px 32px rgba(0, 82, 204, 0.12), 0 4px 8px rgba(17, 24, 39, 0.06);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg-warm);
  color: var(--gray-900);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  line-height: 1.5;
}

.auth-card {
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 40px 36px;
  width: 100%;
  max-width: 420px;
}

.auth-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: 'Poppins', sans-serif;
  font-weight: 700;
  font-size: 20px;
  margin-bottom: 28px;
  justify-content: center;
}
.auth-logo svg { width: 28px; height: 28px; }

h1.auth-title {
  font-family: 'Poppins', sans-serif;
  font-size: 24px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 6px;
}

p.auth-subtitle {
  text-align: center;
  color: var(--gray-500);
  font-size: 14px;
  margin-bottom: 28px;
}

.field-group { margin-bottom: 18px; }

label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 6px;
}

input[type="text"],
input[type="email"],
input[type="password"] {
  width: 100%;
  padding: 11px 14px;
  border: 1.5px solid var(--gray-300);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-family: inherit;
  transition: border-color 200ms ease-out, box-shadow 200ms ease-out;
}
input:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(0, 82, 204, 0.1);
}

.btn-submit {
  width: 100%;
  padding: 13px;
  background: var(--orange);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  margin-top: 8px;
  transition: background-color 200ms ease-out, transform 160ms ease-out, box-shadow 200ms ease-out;
  box-shadow: var(--shadow-md);
}
.btn-submit:hover { background: #E85A28; }
.btn-submit:active { transform: scale(0.97); }
.btn-submit:disabled { opacity: 0.6; cursor: not-allowed; }

.auth-footer {
  text-align: center;
  margin-top: 24px;
  font-size: 14px;
  color: var(--gray-500);
}
.auth-footer a { color: var(--blue); font-weight: 600; text-decoration: none; }
.auth-footer a:hover { text-decoration: underline; }

.error-banner {
  background: #FEF2F2;
  border: 1px solid #FECACA;
  color: #991B1B;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  margin-bottom: 18px;
  display: none;
}
.error-banner.visible { display: block; }

.success-banner {
  background: #F0FDF4;
  border: 1px solid #BBF7D0;
  color: #166534;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  margin-bottom: 18px;
  display: none;
}
.success-banner.visible { display: block; }

.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.4);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 700ms linear infinite;
  vertical-align: -2px;
  margin-right: 8px;
}
@keyframes spin { to { transform: rotate(360deg); } }