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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #e2e8f0;
}

.login-container {
  width: 100%;
  max-width: 420px;
  padding: 20px;
}

.login-card {
  background: rgba(30, 41, 59, 0.8);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(148, 163, 184, 0.1);
  border-radius: 16px;
  padding: 48px 40px;
  text-align: center;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.logo-section {
  margin-bottom: 32px;
}

.logo {
  width: 160px;
  height: 40px;
  color: #14b8a6;
  margin-bottom: 8px;
}

.title {
  font-size: 14px;
  font-weight: 500;
  color: #94a3b8;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.subtitle {
  font-size: 16px;
  color: #cbd5e1;
  margin-bottom: 32px;
}

.error-message {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #fca5a5;
  padding: 12px 16px;
  border-radius: 8px;
  margin-bottom: 24px;
  font-size: 14px;
}

/* Microsoft Sign-In Button */
.microsoft-signin-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
  max-width: 300px;
  margin: 0 auto 24px;
  padding: 12px 24px;
  background: #ffffff;
  border: 1px solid #8c8c8c;
  border-radius: 4px;
  font-family: 'Segoe UI', system-ui, sans-serif;
  font-size: 15px;
  font-weight: 600;
  color: #5e5e5e;
  cursor: pointer;
  transition: background-color 0.2s, box-shadow 0.2s;
}

.microsoft-signin-btn:hover {
  background: #f8f8f8;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.microsoft-signin-btn:active {
  background: #f0f0f0;
}

.microsoft-logo {
  width: 21px;
  height: 21px;
}

/* Loading State */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  color: #94a3b8;
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid rgba(148, 163, 184, 0.2);
  border-top-color: #14b8a6;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.footer-text {
  font-size: 12px;
  color: #64748b;
}