:root {
  --bg: #f3f4f6;
  --card-bg: #ffffff;
  --text: #1f2937;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 2rem 1rem;
}

.portal {
  max-width: 960px;
  width: 100%;
}

.portal-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.portal-header h1 {
  font-size: 1.875rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.portal-header p {
  color: var(--text-muted);
  font-size: 1.125rem;
}

.brands-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.brand-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s, transform 0.2s;
  border-top: 4px solid var(--brand-color, #1f73b7);
}

.brand-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.brand-icon {
  color: var(--brand-color, #1f73b7);
  margin-bottom: 1rem;
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.brand-sso-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--bg);
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  margin-bottom: 1.25rem;
}

.brand-form {
  width: 100%;
}

.form-fields {
  margin-bottom: 1rem;
}

.form-group {
  margin-bottom: 0.75rem;
  text-align: left;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.25rem;
  color: var(--text);
}

.form-group input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.875rem;
  transition: border-color 0.15s;
}

.form-group input:focus {
  outline: none;
  border-color: var(--brand-color, #1f73b7);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand-color, #1f73b7) 20%, transparent);
}

.brand-submit {
  width: 100%;
  padding: 0.625rem 1rem;
  border: none;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  color: #ffffff;
  background: var(--brand-color, #1f73b7);
  cursor: pointer;
  transition: opacity 0.15s;
}

.brand-submit:hover {
  opacity: 0.9;
}

.brand-link {
  display: block;
  text-align: center;
  text-decoration: none;
}

@media (max-width: 640px) {
  .brands-grid {
    grid-template-columns: 1fr;
  }
}