.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 1rem;
}

.login-card {
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    padding: 2.5rem 2rem;
    width: 100%;
    max-width: 420px;
}

.login-header {
    text-align: center;
    margin-bottom: 1.75rem;
}

.login-header h4 {
    font-weight: 700;
    color: #1a1a2e;
    margin-bottom: 0.25rem;
}

.login-header p {
    font-size: 0.85rem;
}

.login-icon {
    font-size: 2.5rem;
    color: #667eea;
    margin-bottom: 0.5rem;
    display: block;
}

.login-form .form-label {
    color: #374151;
    margin-bottom: 0.3rem;
}

.login-form .input-group-text {
    background: #f3f4f6;
    border-right: none;
    color: #6b7280;
}

.login-form .form-control {
    border-left: none;
}

.login-form .form-control:focus {
    box-shadow: none;
    border-color: #667eea;
}

.login-form .form-control:focus ~ .input-group-text,
.login-form .input-group:focus-within .input-group-text {
    border-color: #667eea;
}

.login-form .btn-primary {
    background: linear-gradient(135deg, #667eea, #764ba2);
    border: none;
    padding: 0.6rem;
    font-weight: 600;
    font-size: 0.9rem;
    transition: opacity 0.2s;
}

.login-form .btn-primary:hover {
    opacity: 0.9;
}

.login-form .btn-primary:disabled {
    opacity: 0.6;
}

.divider {
    display: flex;
    align-items: center;
    margin: 1rem 0;
    color: #9ca3af;
    font-size: 0.78rem;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid #e5e7eb;
}

.divider span {
    padding: 0 0.75rem;
}

.microsoft-btn {
    font-weight: 600;
    font-size: 0.85rem;
    padding: 0.55rem;
    border-color: #d1d5db;
    color: #374151;
    transition: all 0.2s;
}

.microsoft-btn:hover {
    background-color: #f9fafb;
    border-color: #9ca3af;
    color: #111827;
}

.alert-sm {
    font-size: 0.82rem;
    padding: 0.5rem 0.75rem;
    margin-bottom: 1rem;
}

.login-footer {
    text-align: center;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid #f3f4f6;
}